WO2018039900A1

WO2018039900A1 - Battery charging method and device, and battery system

Info

Publication number: WO2018039900A1
Application number: PCT/CN2016/097284
Authority: WO
Inventors: 范会平; 明帮生; 赵徳强; 高伟; 汪颖
Original assignee: 宁德新能源科技有限公司
Priority date: 2016-08-30
Filing date: 2016-08-30
Publication date: 2018-03-08

Abstract

A battery charging method and device, and a battery system. The method comprises: acquiring usage data of a battery (S101), wherein the usage data of the battery comprises at least one from the number of cycles of the battery and a cumulative time of the battery; determining, according to the acquired usage data of the battery, whether a condition for reducing the charging rate of the battery is satisfied (S102); if it is determined that the condition for reducing the charging rate of the battery is satisfied, reducing the charging rate of the battery (S103); and charging the battery according to the reduced charging rate of the battery (S104). The method slows down the loss speed of a battery during a cycled charging process to a certain extent, thereby prolonging the cycle life of the battery.

Description

Battery charging method, device and battery system

Technical field

The present application relates to the field of battery technologies, and in particular, to a battery charging method, device, and battery system.

Background technique

With the continuous breakthrough and development of battery technology, the requirements for the cycle life of secondary batteries are becoming higher and higher, for example, the cycle life of batteries is increased from 500 cycles to 800 cycles, 1000 cycles, or even 1500 cycles. Currently, during battery charging, a constant charging current is typically used to charge the battery.

In the process of implementing the present application, the applicant found that at least the following problems exist in the prior art:

In the existing charging method, for a battery of high energy density, as the time of recycling of the battery increases, the polarization of the battery becomes large, and the cathode and the anode of the battery accumulate a large amount of by-products, accelerating the crystal of the cathode material. The destruction of the type and the rapid oxidative decomposition of the electrolyte accelerates the sharp decay of the battery energy and the sharp decay of the battery capacity, affecting the service life of the battery.

Summary of the invention

The present application provides a charging method, device and battery system for a battery, which slows down the loss rate of the battery during the cycle charging process to a certain extent, and prolongs the cycle life of the battery.

The application provides a charging method for a battery, including:

Obtaining usage data of the battery, the usage data of the battery including at least one of a number of cycles of the battery and a cumulative time of the battery;

Determining, according to the usage data of the battery, whether a condition for reducing the charging rate of the battery is satisfied;

If it is determined that the condition for reducing the charging rate of the battery is satisfied, the charging rate of the battery is decreased;

The battery is charged according to the reduced charging rate.

An aspect of the above, and any possible implementation, further providing an implementation manner, The number of cycles of the battery includes at least one of a total number of cycles of the battery and a cycle number interval of the battery.

In an aspect as described above and any possible implementation, an implementation is further provided, wherein the accumulated time of the battery includes at least one of a total accumulated time of the battery and a cumulative time interval of the battery.

The aspect as described above, and any possible implementation manner, further providing an implementation manner, if the usage data of the battery is the number of cycles of the battery, determining whether the battery is lowered according to usage data of the battery The conditions of the charging rate include:

Comparing the obtained number of cycles of the battery with a corresponding number threshold;

If the number of cycles of the battery reaches the corresponding threshold of the number, it is determined that the condition for reducing the charging rate of the battery is satisfied; or if the number of cycles of the battery does not reach the corresponding threshold, the determination is not satisfied. A condition for lowering the charging rate of the battery.

The aspect as described above, and any possible implementation manner, further providing an implementation manner, if the usage data of the battery is the accumulated time of the battery, determining whether the battery is lowered according to the usage data of the battery The conditions of the charging rate include:

Comparing the obtained accumulated time of the battery with a corresponding time threshold;

If the accumulated time of the battery reaches the corresponding time threshold, it is determined that the condition for reducing the charging rate of the battery is satisfied; or if the accumulated time of the battery does not reach the corresponding time threshold, it is determined that the time is not satisfied. A condition for lowering the charging rate of the battery.

The aspect as described above and any possible implementation manner further provide an implementation manner of reducing the charging rate of the battery, including:

Decrease the charging rate of the battery according to a preset charging magnification adjustment interval; or

One candidate charging rate lower than the charging magnification of the battery in the preset charging magnification candidate set is taken as the charging magnification of the battery after the reduction; wherein the charging magnification candidate set includes at least one candidate charging magnification.

The aspect as described above and any of the possible implementations further provide an implementation manner. If the usage data of the battery is the number of cycles, obtaining usage data of the battery includes:

Obtaining a number of times that the battery performs a charging process and performing a discharging process as a number of cycles of the battery; or

Obtaining a maximum voltage of the battery to reach a charging upper limit voltage and the minimum voltage of the battery is up to The number of times to the lower limit voltage of the discharge as the number of cycles of the battery; or,

Obtaining the number of times that the maximum remaining power of the battery reaches the remaining power corresponding to the charging upper limit voltage and the minimum remaining power of the battery reaches the remaining power corresponding to the lower limit voltage of the battery as the number of cycles of the battery.

The aspect as described above and any possible implementation manner further provide an implementation manner of charging the battery according to the adjusted charging magnification, including:

According to the adjusted charging rate, one of four charging modes of constant current charging, pulse charging, step charging, and constant current constant voltage charging, or a combined charging mode of at least two charging modes, The battery is charged.

An aspect of the above, and any possible implementation, further providing an implementation manner,

Before comparing the obtained number of cycles of the battery with a corresponding number threshold, the method further includes:

Dividing at least two temperature segments according to the temperature of the battery, and setting a corresponding number of cycles threshold for each temperature segment;

Determining a temperature segment corresponding to a current temperature of the battery according to a current temperature of the battery;

A threshold number corresponding to the temperature segment is determined based on the temperature segment.

The foregoing aspect, and any possible implementation manner, further provide an implementation manner, before the obtained accumulated time of the battery is compared with a corresponding time threshold, the method further includes:

Dividing at least two temperature segments according to a temperature of the battery, and setting a corresponding time threshold for each temperature segment;

A time threshold corresponding to the temperature segment is determined based on the temperature segment.

One technical solution in the technical solution of the present application has the following beneficial effects:

In the embodiment of the present application, by using the usage data of the battery, the usage data of the battery includes at least one of a cycle number of the battery and a cumulative time of the battery, and then, according to the usage data of the battery, determining whether the condition for reducing the charging rate of the battery is satisfied. When it is judged that the condition for lowering the charging magnification of the battery is satisfied, the charging magnification of the battery is lowered, and further, the battery is charged according to the reduced charging magnification. The charging method provided by the embodiment of the present application comprehensively considers the influence of the storage process of the battery on the deterioration of the battery performance and the influence of the recycling process of the battery on the deterioration of the battery performance, by acquiring the battery The number of cycles, the accumulated time, and the like may indicate usage data of the battery usage condition, and determine whether the preset condition is satisfied based on the usage data, thereby determining whether to reduce the charging magnification of the battery; and, satisfying the preset condition When the charging rate of the battery is appropriately adjusted, and charging the battery according to the adjusted charging magnification, the polarization speed of the battery is slowed down; thereby, the speed of accumulating by-products of the anode and cathode of the battery is slowed down, so that the cathode of the battery is The destruction rate of the crystal form of the material becomes slow, and the oxidative decomposition speed of the electrolyte becomes slow; further, the loss rate of the battery during the cycle charging process is slowed down to some extent, and the cycle life of the battery is prolonged.

The application also provides a charging device for a battery, comprising:

An obtaining unit, configured to acquire usage data of a battery, where usage data of the battery includes at least one of a number of cycles of the battery and a cumulative time of the battery;

a determining unit, configured to determine, according to the usage data of the battery, whether a condition for reducing a charging rate of the battery is satisfied;

An adjusting unit, configured to reduce a charging rate of the battery if it is determined that the condition for reducing the charging rate of the battery is satisfied;

And a charging unit configured to charge the battery according to the reduced charging rate.

In an aspect as described above and any possible implementation, an implementation is further provided, wherein the number of cycles of the battery includes at least one of a total number of cycles of the battery and a cycle number interval of the battery.

The aspect as described above, and any possible implementation manner, further provide an implementation manner, if the usage data of the battery is the number of cycles of the battery, the determining unit is specifically configured to:

The aspect as described above, and any possible implementation manner, further provides an implementation manner, if the usage data of the battery is the accumulated time of the battery, the determining unit is specifically configured to:

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, where the adjusting unit is specifically configured to:

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, if the usage data of the battery is the number of cycles, the acquiring unit is specifically configured to:

Obtaining a number of times that a maximum voltage of the battery reaches a charging upper limit voltage and a minimum voltage of the battery reaches a lower discharge voltage as a number of cycles of the battery; or

The above-mentioned aspect and any possible implementation manner further provide an implementation manner, where the charging unit is specifically configured to:

The foregoing aspect and any possible implementation manner further provide an implementation manner, where the determining unit is specifically configured to:

Before comparing the obtained number of cycles of the battery with a corresponding number threshold, dividing at least two temperature segments according to the temperature of the battery, and setting a corresponding number threshold for each temperature segment;

An aspect of the above, and any possible implementation, further providing an implementation manner, The determining unit is specifically configured to:

Before comparing the obtained accumulated time of the battery with a corresponding time threshold, dividing at least two temperature segments according to the temperature of the battery, and setting a corresponding time threshold for each temperature segment;

The charging device for a battery provided by the embodiment of the present application acquires usage data of the battery by the acquiring unit of the device, the usage data of the battery includes at least one of a number of cycles of the battery and a cumulative time of the battery, and then the determining unit of the device is The battery usage data determines whether the condition for lowering the charging magnification of the battery is satisfied, and if it is determined that the condition for lowering the charging magnification of the battery is satisfied, the adjusting unit of the device reduces the charging magnification of the battery, and further, the charging unit of the device is reduced according to the Charge the battery to charge the battery. In the embodiment of the present application, the influence of the storage process of the battery on the deterioration of the battery performance and the influence of the recycling process of the battery on the deterioration of the battery performance are comprehensively considered, and the usage data of the battery usage condition can be expressed by acquiring the number of cycles and the accumulated time of the battery. And determining whether the preset condition is met according to the usage data, thereby determining whether to reduce the charging rate of the battery; and, when the preset condition is satisfied, appropriately adjusting the charging magnification of the battery, and adjusting according to the adjustment The charging rate charges the battery, so that the polarization speed of the battery becomes slower; thus, the speed of accumulating by-products of the anode and the cathode of the battery is slowed down, so that the destruction rate of the crystal form of the cathode material of the battery is slowed, and the oxidative decomposition of the electrolyte is slowed down. The speed is slower; in turn, the loss rate of the battery during the cycle charging process is slowed down to some extent, and the cycle life of the battery is prolonged.

The application also provides a battery system comprising: a battery and a charging device of the above battery.

The battery system provided by the present application comprehensively considers the influence of the storage process of the battery on the deterioration of the battery performance and the influence of the recycling process of the battery on the deterioration of the battery performance, and the battery usage can be expressed by obtaining the number of cycles of the battery and the accumulated time of the battery. Using the data, and determining whether the preset condition is satisfied based on the usage data, thereby determining whether to reduce the charging rate of the battery; and, when the preset condition is satisfied, appropriately adjusting the charging rate of the battery, and Charging the battery according to the adjusted charging rate, so that the polarization speed of the battery is slowed down; thus, the speed of accumulating by-products of the anode and cathode of the battery is slowed down, so that the destruction rate of the crystal form of the cathode material of the battery is slowed down, and the electrolyte is slowed down. The rate of oxidative decomposition is slower; in turn, the battery is somewhat slowed down. The loss rate during cyclic charging extends the cycle life of the battery.

DRAWINGS

In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, a brief description of the drawings used in the embodiments or the prior art description will be briefly described below. Obviously, the drawings in the following description It is a certain embodiment of the present application, and other drawings can be obtained according to the drawings without any creative labor for those skilled in the art.

1 is a schematic flow chart of Embodiment 1 of a method for charging a battery according to an embodiment of the present application;

2 is a schematic diagram showing a comparison of cycle curves obtained by charging a battery at different charging rates;

3 is a schematic diagram of a correspondence between a voltage of a battery and a remaining power in the embodiment of the present application;

4 is a schematic flow chart of Embodiment 2 of a method for charging a battery according to an embodiment of the present application;

FIG. 5 is a schematic flowchart of Embodiment 3 of a method for charging a battery according to an embodiment of the present application;

6 is a functional block diagram of a charging device for a battery according to an embodiment of the present application;

FIG. 7 is a functional block diagram of a battery system according to an embodiment of the present application; FIG.

FIG. 8 is a first schematic diagram of a battery system according to an embodiment of the present application.

FIG. 9 is a second schematic diagram of a battery system according to an embodiment of the present application.

detailed description

The technical solutions in the embodiments of the present application are clearly and completely described in the following with reference to the accompanying drawings in the embodiments of the present application. It is a part of the embodiments of the present application, and not all of the embodiments. All other embodiments obtained by a person of ordinary skill in the art based on the embodiments of the present application without departing from the inventive scope are the scope of the present application.

Embodiment 1

The embodiment of the present application provides a charging method of a battery. Please refer to FIG. 1 , which is a schematic flowchart of Embodiment 1 of a charging method of a battery provided by an embodiment of the present application. As shown in Figure 1, the method includes:

S101. Obtain usage data of the battery.

Specifically, in the embodiment of the present application, the usage data of the battery may include, but is not limited to, a battery. At least one of the number of cycles and the accumulated time of the battery. In addition, the usage data of the battery may also include related data of the current capacity of the battery, the current energy of the battery, the capacity retention rate of the battery, the energy retention rate of the battery, the temperature of the battery, and the like.

Specifically, in the embodiment of the present application, the number of cycles of the battery may include, but is not limited to, at least one of a total cycle data of the battery and a cycle number interval of the battery, which is not specifically limited in the embodiment of the present application.

Specifically, in the embodiment of the present application, the accumulated time of the battery may include, but is not limited to, at least one of a total accumulated time of the battery and a cumulative time interval of the battery, which is not specifically limited in this embodiment of the present application.

S102. Determine whether the condition for lowering the charging magnification of the battery is satisfied according to the usage data of the battery.

It can be understood that, in the embodiment of the present application, different judgment conditions may be used for determining according to the acquired usage data of the battery.

S103. If it is determined that the condition for lowering the charging magnification of the battery is satisfied, the charging magnification of the battery is lowered.

S104, charging the battery according to the reduced charging magnification.

In the embodiment of the present application, if the charging rate of the battery is reduced, the battery is charged by the reduced charging rate during the cyclic charging of the battery, and the battery is charged to the charging cut-off voltage by the reduced charging rate; During the cyclic discharge of the battery, the battery is discharged.

Specifically, the specific charging method for charging the battery according to the adjusted charging magnification is not particularly limited in the embodiment of the present application.

In a specific implementation process, one of four charging modes: constant current charging, pulse charging, step charging, and constant current constant voltage charging, or a combination charging mode of at least two charging modes may be used. The battery is charged.

For example, it is assumed that the charging parameter of the adjusted battery is: the charging cutoff voltage of the battery is V4, and the charging magnification of the battery is C3. For example, when charging the battery, the battery can be charged with a constant current at a charging rate C3, the voltage to be charged reaches the charging cut-off voltage V4, and the battery is charged with a constant voltage of the charging voltage V4, and when charging to the charging cut-off current, Charging is over. Alternatively, for example, when charging the battery, constant current charging may be employed, that is, the battery is subjected to constant current charging at a charging magnification C3, and charging is completed when charging to the charging cutoff voltage V4.

It should be noted that, in the charging method provided by the embodiment of the present application, the charging cutoff voltage of the battery may be the same, or the charging cutoff voltage of the battery may be different. No particular limitation is imposed.

Specifically, in the embodiment of the present application, the performance test of the lithium ion secondary battery is performed according to the technical solution of the present application to explain the technical effects of the present application.

Please refer to FIG. 2 , which is a comparison diagram of a cycle curve obtained by charging a battery at different charging rates.

Specifically, as shown in FIG. 2, at a battery ambient temperature of 25 ° C, the battery is discharged to 3.0 V at a discharge rate of 4 C, and after 30 minutes of dormancy, the battery is charged to 4.35 V with a constant current of 1.5 C, and then a constant voltage of 4.35. V was charged until the charge rate was lowered to 0.05 C for 15 minutes, and then discharged to 3.0 V at a discharge rate of 4 C, and thus cycled 500 times to obtain a cycle curve 1. At a battery ambient temperature of 25 ° C, the battery is discharged to 3.0 V at a discharge rate of 4 C, after 30 minutes of dormancy, and then charged to 4.35 V with a constant current of 2 C, and then charged at a constant voltage of 4.35 V until the charge rate is lowered to 0.05 C. After 15 minutes, the battery was discharged to 3.0 V at a discharge rate of 4 C, and thus cycled 500 times to obtain a cycle curve 2.

As shown in FIG. 2, when the cycle curve 1 and the cycle curve 2 are in the 80th cycle, the capacity retention rate of the cycle curve 2 is lower than the capacity retention rate of the cycle curve 1. Further, as the number of cycles increases, the difference between the capacity retention ratio of the cycle curve 1 and the capacity retention rate of the cycle curve 2 increases first, and the difference after the difference is maintained. That is, by lowering the charging rate of the battery, it is possible to slow down the capacity retention rate of the battery to a certain extent, and further, it is possible to extend the life of the rechargeable battery.

In the embodiment of the present application, by using the usage data of the battery, the usage data of the battery includes at least one of a cycle number of the battery and a cumulative time of the battery, and then, according to the usage data of the battery, determining whether the condition for reducing the charging rate of the battery is satisfied. When it is judged that the condition for lowering the charging magnification of the battery is satisfied, the charging magnification of the battery is lowered, and further, the battery is charged according to the reduced charging magnification. The charging method provided by the embodiment of the present application comprehensively considers the influence of the storage process of the battery on the deterioration of the battery performance and the influence of the recycling process of the battery on the deterioration of the battery performance, and can indicate the battery usage by acquiring the number of cycles and the accumulated time of the battery. Using the data, and determining whether the preset condition is satisfied based on the usage data, thereby determining whether to reduce the charging rate of the battery; and, when the preset condition is satisfied, appropriately adjusting the charging rate of the battery, and Charging the battery according to the adjusted charging rate, so that the polarization speed of the battery is slowed down; thus, the speed of accumulating by-products of the anode and cathode of the battery is slowed down, so that the crystal form of the cathode material of the battery is broken. The bad speed is slow, and the oxidative decomposition speed of the electrolyte is slowed down; further, the loss rate of the battery during the cycle charging process is slowed down to some extent, and the cycle life of the battery is prolonged.

Embodiment 2

Based on the charging method of the battery provided in the first embodiment of the present application, the implementation manner of the “acquiring battery usage data” in S101 in the first embodiment is specifically described in the embodiment of the present application.

Specifically, in the embodiment of the present application, if the usage data of the battery is the number of cycles of the battery, the usage data of the battery is obtained, that is, the number of cycles of the battery is obtained. Specifically, in the embodiment of the present application, there are a plurality of implementation manners for obtaining the number of cycles of the battery, which is not specifically limited in the embodiment of the present application.

In a specific implementation process, in the embodiment of the present application, the number of cycles of acquiring the battery may include, but is not limited to, the following three modes:

First type: The number of cycles in which the battery is subjected to a charging process and a discharging process is performed as the number of cycles of the battery.

It should be noted that the number of cycles of the battery is obtained by this method, and it is not necessary to consider the charge cutoff voltage, the charging upper limit voltage, the charging time, the charging rate, etc. of the battery during charging, and it is also unnecessary to consider the discharge cutoff of the battery during discharge. Voltage, discharge lower limit voltage, discharge time, discharge rate, etc., as long as the battery is subjected to a charging process and a discharge process is performed, the number of cycles of the battery is increased by one.

In a specific implementation process, the current change of the battery and/or the voltage change of the battery can be detected to determine the number of times the battery is subjected to the charging process and the discharging process is performed, and then the number of cycles of the battery can be determined. It should be understood that the solution is only used to describe the implementation of the embodiments of the present application, and is not intended to limit the application.

For example, for a battery with an operating voltage range of 3.0V to 4.35V, the initial voltage of the battery is 3.8V, the battery is charged once, the charging process is 5 minutes, the charging process is finished, and the battery voltage is 3.81V; The battery was subjected to a discharge process. The duration of the discharge process was 10 minutes, the discharge process was completed, and the battery voltage was 3.75V. At this time, the battery performs a charging process and a discharging process, so the number of cycles of obtaining the battery is 1.

Second: The number of times the maximum voltage of the battery is greater than or equal to the upper limit voltage of the charge and the minimum voltage of the battery is less than or equal to the lower limit voltage of the discharge is taken as the number of cycles of the battery.

It should be noted that, when the number of cycles of the battery is obtained by the method, the charging process of the battery includes: charging the battery to the upper limit voltage of charging; and discharging the battery includes: discharging the battery to discharging Limit voltage.

For example, for a battery with an operating voltage range of 3.0V to 4.35V, if the initial voltage of the battery is 3.8V, the upper limit voltage of the battery is 4.2V, and the lower limit voltage of the battery is 3.2V, then only the battery is required to be cycled. During the process, the maximum voltage of the battery is greater than or equal to the battery charging upper limit voltage 4.2V, and the minimum voltage of the battery is less than the battery discharge lower limit voltage 3.2V, the number of cycles of the battery can be determined. If the battery is in the process of cycling, the maximum voltage of the battery is greater than or equal to the battery charging upper limit voltage 4.2V and the minimum voltage of the battery is less than the battery discharge lower limit voltage 3.2V four times, the number of cycles of the obtained battery Is 4.

It should be noted that the upper limit voltage of the battery is used to calculate the number of cycles of the battery, and the value of the upper limit voltage of the battery may be less than or equal to the charge cut-off voltage of the battery. In a specific implementation process, the upper limit voltage of the battery may be based on actual conditions. The preset needs to be performed, and the embodiment of the present application does not specifically limit this.

It should be noted that the discharge lower limit voltage of the battery is used to calculate the number of cycles of the battery, and the discharge lower limit voltage of the battery may be greater than or equal to the discharge cutoff voltage of the battery. In a specific implementation process, the discharge lower limit voltage of the battery may be based on actual conditions. The preset needs to be performed, and the embodiment of the present application does not specifically limit this.

In a specific implementation process, during the discharge process of the battery, the discharge cutoff voltage of the battery may be in the range of 1.0V to 3.8V, and the discharge lower limit voltage of the battery may be higher than the discharge cutoff voltage of the battery. Make a preset.

The third type: obtaining the maximum remaining power of the battery is greater than or equal to the remaining power corresponding to the charging upper limit voltage and the minimum remaining power of the battery is less than or equal to the number of remaining power corresponding to the lower limit voltage of the battery, as the number of cycles of the battery.

Please refer to FIG. 3 , which is a schematic diagram of the relationship between the voltage of the battery and the remaining power in the embodiment of the present application. As shown in FIG. 3, a correspondence relationship between the voltage of the battery and the remaining power of the battery can be established, wherein V1 represents the upper limit voltage of the battery, and SOC1 is the remaining power corresponding to the upper limit voltage of the battery; V2 represents the battery. The lower limit voltage of the discharge, SOC2 is the remaining charge corresponding to the lower limit voltage of the discharge of the battery.

In a specific implementation process, by using the correspondence between the voltage of the battery and the remaining power of the battery, it is only necessary to detect whether the maximum remaining battery capacity of the battery is greater than or equal to the remaining power corresponding to the preset charging upper limit voltage, and detect the minimum remaining battery. Whether the power is less than or equal to the preset discharge The voltage limit corresponds to the remaining charge to determine if the battery has completed a battery cycle.

For example, for a battery with a working voltage range of 3.0V to 4.35V, the initial voltage of the battery is less than the upper limit voltage of the battery, and the remaining power corresponding to the upper limit voltage of the battery is 98%, corresponding to the lower limit voltage of the battery. The remaining power is 10%, then only need to determine that the battery is in the process of cycling, the maximum remaining battery capacity is greater than or equal to 98% of the remaining power corresponding to the battery's upper charging voltage and the minimum remaining battery capacity is less than or equal to the battery discharge. The number of cycles of the battery can be determined by the number of times the remaining amount of power corresponding to the lower limit voltage is 10%. If the battery is in the process of cycling, the maximum remaining power of the obtained battery is greater than or equal to 98% of the remaining power corresponding to the upper limit voltage of the battery, and the minimum remaining capacity of the battery is less than or equal to the remaining power corresponding to the lower limit voltage of the battery. The number of times of % is 3, and the number of cycles of the obtained battery is 3.

In a specific implementation process, the remaining power of the battery corresponding to the upper limit voltage of the battery may be 80% to 100%; the remaining power of the battery corresponding to the lower discharge voltage of the battery may be 0% to 15%.

It can be understood that the implementation manner of obtaining the number of cycles of the battery provided by the embodiment of the present application can be used to obtain the total number of cycles of the battery, and can also be used to obtain the cycle number interval of the battery.

Specifically, in the embodiment of the present application, the total number of cycles of obtaining the battery may be cumulatively counted for the number of cycles of the battery, and the count is uninterrupted during the cycle of using the battery; the number of cycles of obtaining the battery may be the number of cycles of the battery The segment count is performed. If the number of cycles of the battery reaches the preset value, the count of the number of cycles is cleared to zero and the counting is restarted.

It should be noted that, when the total number of cycles of the battery is obtained, the total number of cycles of the battery may be directly obtained, and the total number of cycles of the battery may be obtained by obtaining the number of cycles of the accumulated battery. .

It should be noted that, when the number of cycles of the battery is obtained, the number of cycles of the battery may be directly obtained, and the number of cycles of the battery may be calculated by obtaining the total number of cycles of the battery, which is not specifically limited in this embodiment of the present application.

It should be noted that during the recycling of the battery, the battery passes through at least one charging process and at least one discharging process. The charging process of the battery and the sequence of performing the discharging process in the embodiment of the present application are not specifically limited. In a specific implementation process, a battery cycle may first perform a charging process and then perform a discharging process, or a battery cycle may first perform a discharging process and then perform a charging process.

Specifically, in the embodiment of the present application, if the usage data of the battery is the accumulated time of the battery, the usage data of the battery is obtained, that is, the accumulated time of the battery is obtained. Specifically, in the embodiment of the present application, there are a plurality of implementation manners for obtaining the accumulated time of the battery, which is not specifically limited in the embodiment of the present application.

In a specific implementation process, in the embodiment of the present application, the accumulated time of acquiring the battery may include, but is not limited to, counting the accumulated time of the battery to obtain the accumulated time of the battery.

It can be understood that the implementation manner of obtaining the accumulated time of the battery provided by the embodiment of the present application can be used to obtain the total accumulated time of the battery, and can also be used to obtain the accumulated time interval of the battery.

Specifically, in the embodiment of the present application, the total accumulated time of the battery may be accumulated, and the accumulated time of the battery may be accumulated. During the cycle of using the battery, the timing is uninterrupted; and the accumulated time interval of the battery may be accumulated time of the battery. The segmentation timing is performed. If the accumulated time interval of the battery reaches the preset value, the timing of the accumulated time is cleared and the timing is restarted.

It should be noted that, when the total accumulated time of the battery is obtained, the total accumulated time of the battery may be directly obtained, or the total accumulated time of the battery may be obtained by obtaining the accumulated time interval of the accumulated battery. .

It should be noted that, when the accumulated time interval of the battery is obtained, the accumulated time interval of the battery may be directly obtained, and the cumulative time interval of the battery may be calculated by acquiring the total accumulated time of the battery.

It should be noted that, in the embodiment of the present application, when the usage data of the battery is obtained, whether the battery is in the use state during the charging process and the discharging process or whether the battery is in the storage state, the embodiment of the present application does not particularly limit this.

The charging method provided by the embodiment of the present application comprehensively considers the influence of the storage process of the battery on the deterioration of the battery performance and the influence of the recycling process of the battery on the deterioration of the battery performance, and can represent the battery by acquiring the number of cycles of the battery and the accumulated time of the battery. The use data of the use case, and judge whether the preset condition is satisfied according to the use data, thereby determining whether to reduce the charge rate of the battery; and, when the preset condition is satisfied, appropriately adjust the charge rate of the battery And charging the battery according to the adjusted charging rate, so that the polarization speed of the battery is slowed down; thus, the speed of accumulating by-products of the anode and the cathode of the battery is slowed down, so that the destruction rate of the crystal form of the cathode material of the battery is slowed down. The oxidative decomposition speed of the electrolyte is slowed down; further, the loss rate of the battery during the cycle charging process is slowed down to some extent, and the cycle life of the battery is prolonged.

Embodiment 3

Based on the charging method of the battery provided in the first embodiment of the present application, the embodiment of the present application specifically describes the implementation manner of “determining whether the condition for reducing the charging rate of the battery is satisfied according to the usage data of the battery” in S102 in the first embodiment.

Specifically, according to the obtained usage data of the battery, determining whether the condition for reducing the charging rate of the battery is satisfied may include, but is not limited to, the following two implementation manners:

The first type: if the used data of the battery is the number of cycles of the battery, compare the number of cycles of the battery with a corresponding number threshold; if the number of cycles of the battery reaches a corresponding number threshold, it is determined that the charging rate of the battery is reduced. Or; if the number of cycles of the battery does not reach the corresponding number threshold, it is judged that the condition for lowering the charging rate of the battery is not satisfied.

Specifically, when the number of cycles of the battery reaches a corresponding number threshold, that is, when the number of cycles of the battery is equal to the corresponding number threshold, it can be determined that the condition for lowering the charging rate of the battery is satisfied.

It can be understood that if the number of cycles of the battery is less than or greater than the corresponding number threshold, that is, the number of cycles of the battery does not reach the corresponding number threshold, it is determined that the condition for lowering the charging rate of the battery is not satisfied.

Specifically, if the used data of the obtained battery is the total number of cycles of the battery, the total number of cycles of the battery is compared with a corresponding total number threshold, and if the total number of cycles of the battery reaches a corresponding total number threshold, it is determined that the number of cycles is satisfied. The condition for lowering the charge rate of the battery.

Or, specifically, if the acquired usage data of the battery is the cycle number interval of the battery, comparing the cycle number interval of the battery with the corresponding interval number threshold, and if the cycle number interval of the battery reaches the corresponding interval number threshold, determining The condition that the charging rate of the battery is lowered is satisfied.

It can be understood that if the usage data of the obtained battery is the total number of cycles and the number of cycles, the total number of cycles of the obtained battery can be compared with the total number threshold, and the obtained number of cycles and intervals can be obtained. The number threshold is compared. If the total number of cycles of the acquired battery reaches the total number threshold and the acquired number of loops reaches at least one of the threshold number thresholds, it is determined that the condition for lowering the charging rate of the battery is satisfied.

It should be noted that, in the embodiment of the present application, the threshold of the number of the at least one battery may be set, which is not specifically limited in this embodiment of the present application. For example, the number of batteries can be set to a threshold of N1, N2, ..., Nn, where n is an integer greater than zero. When comparing the number of cycles of the obtained battery with the number threshold, only when the number of cycles of the acquired battery is equal to the preset at least one number threshold When a threshold value is determined, that is, it is judged that the number of cycles of the acquired battery reaches a corresponding number threshold, it is judged that the condition for lowering the charging magnification of the battery is satisfied.

For example, suppose that the total number of thresholds corresponding to the total number of cycles of the battery is preset to be 10, 20, 30, that is, when the total number of cycles of the battery reaches the 10th cycle, the 20th cycle, and the 30th cycle, The condition for lowering the charging rate of the battery is achieved. Obtaining the total number of cycles of the battery. If the total number of cycles of the obtained battery is 9, the total number of cycles 9 of the obtained battery is compared with the total number of thresholds 10, 20, and 30, and the total cycle of the obtained battery is known. The number 9 is not equal to any one of the number thresholds 10, 20, and 30. At this time, it is judged that the condition for lowering the charging magnification of the battery is not reached; if the total number of cycles of the obtained battery is 20, the obtained battery will be obtained. The total number of cycles 20 is compared with the total number thresholds 10, 20, 30. It can be seen that the total number of cycles 20 of the obtained batteries is equal to the total number threshold 20, and it is judged that the condition for lowering the charging magnification of the battery is reached.

Or, for example, it is assumed that the threshold number of intervals corresponding to the number of cycles of the battery is preset to be 5, that is, when the cycle number interval of the battery reaches 5 cycles each time, it is considered that the condition for lowering the charging rate of the battery is satisfied. , start counting again to get the next set of loop number intervals.

It should be noted that the above examples are only used to illustrate the solution, and are not intended to limit the application. In a specific implementation process, when the preset total number threshold and the interval number threshold are preset, the preset may be preset according to a fixed adjustment interval, for example, the total number of preset batteries is 5, 10, 15; or, according to The fixed adjustment interval is preset, for example, the total number of batteries can be preset to a threshold of 5, 15, 30, and the like. This embodiment of the present application does not specifically limit this.

The example shown in FIG. 4 will be described. Please refer to FIG. 4 , which is a schematic flowchart diagram of Embodiment 2 of a charging method of a battery provided by an embodiment of the present application. As shown in FIG. 4, N is the total number of cycles of the acquired battery, and the preset total number threshold has n, which are respectively N1, N2, ..., Nn. At this time, the obtained N is compared with N1. If N<N1, it is determined that the condition for lowering the charging magnification of the battery is not satisfied, and the charging magnification C1 of the battery is kept unchanged; if N=N1, then, judging The charging magnification C1 of the battery is adjusted to the charging magnification C2 under the condition that the charging magnification of the battery is lowered.

It should be noted that, as shown in FIG. 4, in the embodiment of the present application, the charging rate of the battery is adjusted from C1 to C2 at the beginning of the cycle of N=N1. Therefore, when N>N1, the second round needs to be performed. The comparison and judgment are made to determine whether or not the condition for lowering the charge rate of the battery is satisfied again. Therefore, for the loop process of N>N1, it is necessary to judge by the second round of N<N2, if N<N2 is passed If the second round is judged as YES, it is judged that the condition for lowering the charging magnification of the battery is not satisfied, and the charging magnification of the battery is kept unchanged at C2 until the number of cycles of the battery N=N2, and it is judged that the charging magnification of the battery is lowered. Under the condition, the charging rate of the battery is adjusted from C2 to the charging magnification C3.

In a specific implementation process, when the threshold number of the battery is preset, the temperature of the battery may also be considered. The temperature of the battery may include, but is not limited to, at least one of a battery temperature, an ambient temperature of the battery, and an operating temperature of the battery. The application example is not particularly limited.

Specifically, the battery may be divided into at least two temperature segments according to the temperature of the battery, and a corresponding number threshold is set for each temperature segment, and then the temperature segment corresponding to the current temperature of the battery is determined according to the current temperature of the battery, and thus, according to the determined The temperature segment gives a threshold number corresponding to the temperature segment.

It is to be understood that the number threshold may include, but is not limited to, at least one of a total number threshold and a threshold number threshold, which is not specifically limited in the embodiment of the present application.

In a specific implementation process, when a corresponding number threshold is set for each temperature segment, a specific value may be set as the threshold number of the battery, or a range of values may be set, so as to select the value range according to actual needs. A certain value is used as the threshold number of the battery, which is not specifically limited in the present application.

The threshold value of the number of preset batteries is used as an example. The temperature can be divided into three temperature segments according to the ambient temperature of the battery, for example, a temperature greater than 40 ° C is divided into a high temperature segment; a temperature ranging from 15 ° C to 35 ° C is divided into a medium temperature segment, which will be less than 15 ° C. Divided into low temperatures. Then, a corresponding threshold number of intervals is set for the high temperature section, the medium temperature section, and the low temperature section, respectively. Since the reaction between the electrolyte and the cathode and anode surfaces is more intense at high temperatures, the rate of consumption of the electrolyte is faster, so a smaller threshold number of intervals can be set for the high temperature section; and at lower temperatures, the conductivity of the electrolyte is reduced, the viscosity Increasingly large, the anode is more susceptible to lithium during the cycle. Further, in order to avoid a frequent decrease in the charging rate of the battery, the charging speed of the battery is greatly reduced, and the threshold number of intervals may be set to increase as the number of cycles increases. Therefore, at least one smaller value range may be set for the high temperature section and the low temperature section, for example, the first interval number threshold of the battery may be in the range of [150, 300], and the subsequent threshold intervals may be in the range of [300, 800]. Since the temperature is moderate, a threshold interval of a relatively large number of relatively high temperature segments may be set for the intermediate temperature section, for example, the first number of threshold intervals of the battery may range from [300, 500], and the range of subsequent threshold intervals may be [500] , 1000]. Therefore, when the current temperature of the battery is determined, the temperature range corresponding to the current temperature can be determined, and further, According to the temperature segment, a threshold number of thresholds of the number of batteries is set within a threshold interval corresponding to the temperature segment.

In a specific implementation process, the battery capacity and battery energy loss will increase due to the excessively low charging rate, which is not conducive to the battery capacity and battery energy retention. Therefore, the battery interval threshold can be set. For increasing trends, such as setting 5, 12, 25, 40, and/or, the cycle number interval between the total number of battery thresholds is set to a gradually increasing trend to maintain battery capacity and battery energy.

The second type: if the acquired battery usage data is the accumulated time of the battery, the accumulated time of the battery is compared with the corresponding time threshold; if the accumulated time of the battery reaches the corresponding time threshold, it is determined that the charging rate of the reduced battery is satisfied. Or; if the accumulated time of the battery does not reach the corresponding time threshold, it is judged that the condition for lowering the charging rate of the battery is not satisfied.

Specifically, when the accumulated time of the battery reaches a corresponding time threshold, that is, when the accumulated time of the battery is equal to the corresponding time threshold, it can be determined that the condition for lowering the charging rate of the battery is satisfied.

It can be understood that if the accumulated time of the battery is less than or greater than the corresponding time threshold, that is, the accumulated time of the battery does not reach the corresponding time threshold, it is determined that the condition for reducing the charging rate of the battery is not satisfied.

Specifically, if the acquired battery usage data is the total accumulated time of the battery, the total accumulated time of the battery is compared with the corresponding total time threshold, and if the total accumulated time of the battery reaches the corresponding total time threshold, it is determined that the battery is satisfied. The condition for lowering the charge rate of the battery.

Or, specifically, if the acquired battery usage data is the accumulated time interval of the battery, comparing the accumulated time interval of the battery with the corresponding interval time threshold, and if the accumulated time interval of the battery reaches the corresponding interval time threshold, determining The condition that the charging rate of the battery is lowered is satisfied.

It can be understood that if the acquired usage data of the battery is the total accumulated time and the accumulated time interval, the total accumulated time of the obtained battery can be compared with the total time threshold, and the acquired accumulated time interval and interval can be obtained. The time threshold is compared. If the total accumulated time of the acquired battery reaches the total time threshold and the acquired accumulated time interval reaches at least one of the interval time thresholds, it is determined that the condition for lowering the charging rate of the battery is satisfied.

It should be noted that, in the embodiment of the present application, a time threshold of at least one battery may be set, which is not specifically limited in this embodiment of the present application. For example, the time threshold of the battery can be set to T1, T2, ... Tn, where n is an integer greater than zero. The accumulated time of the obtained battery is compared with the time threshold In comparison, when it is determined that the accumulated time of the acquired battery is equal to one of the preset at least one time threshold, that is, it is determined that the accumulated time of the acquired battery reaches the corresponding time threshold, it is determined that the reduced battery is satisfied. The condition of the charging rate.

For example, suppose that the total time threshold corresponding to the total accumulated time of the battery is preset to be 10, 20, 30, that is, when the total accumulated time of the battery reaches the 10th month, the 20th month, and the 30th month, The condition for lowering the charging rate of the battery is achieved. Obtain the total accumulated time of the battery. If the total accumulated time of the obtained battery is 9, the total accumulated time 9 of the obtained battery is compared with the total time thresholds 10, 20, and 30, and the total accumulated battery is obtained. The time 9 is not equal to any one of the total time thresholds 10, 20, and 30. At this time, it is judged that the condition for lowering the charging rate of the battery is not reached; if the total accumulated time of the obtained battery is 20, the time is obtained. The total accumulated time 20 of the battery is compared with the total time thresholds 10, 20, and 30. It can be seen that the total accumulated time 20 of the obtained battery is equal to the total time threshold 20, and it is judged that the condition for lowering the charging magnification of the battery is reached.

Or, for example, suppose that the interval time threshold corresponding to the accumulated time interval of the battery is preset to be 5, that is, when the accumulated time interval of the battery reaches 5 each time, it is considered that the condition for lowering the charging rate of the battery is satisfied, At the beginning, the time is re-timed to get the next set of accumulated time intervals.

It should be noted that the above examples are only used to illustrate the solution, and are not intended to limit the application. In a specific implementation process, when the total time threshold and the interval time threshold are preset, the preset may be preset according to a fixed adjustment interval, for example, the total time threshold of the preset battery is 5, 10, 15; or, according to The fixed adjustment interval is preset, for example, the total time threshold of the battery can be preset to be 5, 15, 30, and the like. This embodiment of the present application does not specifically limit this.

In a specific implementation process, an interval time threshold of the battery may be set during the entire cycle of the battery, and when the accumulated time interval of the acquired battery is equal to the interval time threshold, it is determined that the charging rate of the battery is reduced. conditions of. For example, if the interval time threshold of the battery is preset to be 5, in the whole cycle of the battery, as long as the accumulated time interval of the battery reaches 5, it is judged that the condition for lowering the charging magnification of the battery is satisfied, and the charging magnification of the battery is lowered. At this point, the count is cleared and the count is restarted to get the next set of accumulated time intervals.

Alternatively, in another specific implementation, an interval threshold of at least two batteries may also be set during the entire cycle of the battery. For example, if the interval time thresholds of the batteries are preset to be 5 and 10, the cumulative time interval of the acquired batteries may be preset to be alternately compared with the interval time thresholds 5 and 10 during the entire cycle of the battery; or Can be at least one round before the front In the process, the interval time threshold 5 is used to compare with the accumulated time interval of the battery, and the subsequent comparison process uses the interval time threshold 10 to compare with the accumulated time interval of the battery. It is to be understood that the examples are only intended to illustrate the present invention and are not intended to limit the application. In the embodiment of the present application, the sequence and the rule that the at least two interval time thresholds are respectively compared with the accumulated time interval of the battery may be set according to actual needs, which is not specifically limited in the embodiment of the present application.

In a specific implementation process, when the time threshold of the battery is preset, the temperature of the battery may also be considered. The temperature of the battery may include, but is not limited to, at least one of a battery temperature, an ambient temperature of the battery, and an operating temperature of the battery. The application example is not particularly limited.

Specifically, the battery may be divided into at least two temperature segments according to the temperature of the battery, and a corresponding time threshold is set for each temperature segment, and then the temperature segment corresponding to the current temperature of the battery is determined according to the current temperature of the battery, and thus, according to the determined In the temperature segment, a time threshold corresponding to the temperature segment is obtained.

It is to be understood that the time threshold may include, but is not limited to, at least one of a total time threshold and an interval time threshold, which is not specifically limited in the embodiment of the present application.

In a specific implementation process, when a corresponding number threshold is set for each temperature segment, a specific value may be set as the threshold number of the battery, or a range of values may be set, so as to select the value range according to actual needs. A certain value is used as the threshold of the number of the batteries, which is not specifically limited in the embodiment of the present application.

It should be noted that the above two implementation manners are only used to explain how to "determine whether the condition for reducing the charging rate of the battery is satisfied according to the usage data of the battery", and in a specific implementation process, the foregoing implementation may be implemented. The method of determining the manner may be determined by a combination of the foregoing two implementation manners, which is not specifically limited in the embodiment of the present application.

The combination of the two implementations in the above methods will be described as an example.

Please refer to FIG. 5 , which is a schematic flowchart of Embodiment 3 of a method for charging a battery according to an embodiment of the present application.

As shown in FIG. 5, N is the total number of cycles of the obtained battery, and the preset n total number thresholds are respectively N1, N2, ..., Nn, and t1, t2, ..., tm are cumulative time intervals of the acquired batteries. The preset n interval time thresholds are T1, T2, ..., Tm, respectively. When the battery starts to be used for recycling, the obtained N is compared with N1, and the obtained t1 is compared with T1. If N<N1 and t1<T1 are satisfied at the same time, it is determined that the charging of the battery is not satisfied. The condition of the magnification keeps the charging rate C1 of the battery unchanged, and charges the battery to the voltage using C1. V1; if N<N1 and t1=T1 are satisfied, at this time, if the determination of t1<T1 is NO, it is determined that the condition for lowering the charging magnification of the battery is satisfied, and the charging magnification of the battery is adjusted from C1 to C2, and the pair C2 is used. The battery is charged to V2; or if N=N1 and t1=T1 are satisfied, at this time, if the determination of N<N1 is NO and the determination by T<T1 is NO, it is determined that the condition for lowering the charging magnification of the battery is satisfied. The charge rate of the battery is adjusted from C1 to C2, and the battery is charged to V2 using C2.

It is to be understood that the example shown in FIG. 5 is only a specific implementation process of one of the above combinations, and the example is only used to illustrate the solution, and is not intended to limit the application.

Embodiment 4

Based on the charging method of the battery provided in the first embodiment of the present application, the embodiment of the present application specifically describes the implementation manner of “reducing the charging rate of the battery if the condition of reducing the charging rate of the battery is satisfied” in S103 in the first embodiment.

Specifically, in the embodiment of the present application, if the condition for lowering the charging magnification of the battery is determined according to the usage data of the battery, the charging magnification of the battery is lowered to charge the battery according to the charging magnification of the reduced battery.

In the embodiment of the present application, reducing the charging rate of the battery may include, but is not limited to, the following two implementation manners:

The first type: adjust the interval according to the preset charging rate to reduce the charging rate of the battery.

Specifically, the charging magnification adjustment interval ΔC may be preset, and ΔC is used to indicate an adjustment interval between charging rates of two adjacent batteries. It will be appreciated that ΔC may include, but is not limited to, at least one value. Then, when it is detected that the usage data of the battery satisfies the condition of lowering the charging rate of the battery, the battery is lowered. The charge rate can be achieved by subtracting ΔC from the current charge rate.

4 is taken as an example. If the charging magnification adjustment interval ΔC1, ΔC2, ... ΔCn-1 is preset, the adjustment interval between C1 and C2 is ΔC1, and the difference between C1 and ΔC1 can be subtracted as the charging of C2. The magnification value; the adjustment interval between C2 and C3 is ΔC2, and the difference of C2 minus ΔC2 can be used as the charging magnification value of C3; and so on, the charging magnifications C1, C2, ..., Cn of the battery are obtained.

Alternatively, for example, if the charging magnification adjustment interval ΔC=ΔC1=ΔC2=...ΔCn-1 is preset, the adjustment interval between Cn-1 and Cn is ΔC, and the difference of C1 minus ΔC can be taken as C2. The charging magnification value, the difference of C2 minus ΔC is taken as the charging magnification value of C3, and so on, and the charging magnifications C1, C2, ... Cn of the battery are obtained.

If the charging magnification adjustment interval is too large, the charging speed of the battery will be reduced too much, and the charging time of the battery will be greatly prolonged. If the charging magnification adjustment interval is too small, the improvement of the cycle life of the battery is not obvious, so In a specific implementation process, the charging magnification adjustment interval ΔC can be taken in the range of [0.1C, 2C]; in a preferred implementation process, the charging magnification adjustment interval ΔC can be in the range of [0.3C, 1C] .

It should be noted that, in the embodiment of the present application, as the battery is recycled, the charging magnification adjustment interval ΔC may be set to gradually decrease, thereby avoiding a large decrease in battery capacity due to excessive reduction in the charging rate of the battery. problem.

The second type: a candidate charging rate lower than the charging rate of the battery in the preset charging magnification candidate set is taken as the charging magnification of the reduced battery; wherein the charging magnification candidate set includes at least one candidate charging magnification.

For example, the charge rate candidate set of the battery may be preset, and the charge rate set may include at least one candidate charge rate, such as C1, C2, C3, C4, and C5, when the battery usage data is detected to satisfy the reduction of the battery charge. The condition of the magnification, which reduces the charging magnification of the battery, may select one of the candidate charging magnifications C1, C2, C3, C4, C5 which is lower than the charging magnification of the current battery. If the current battery charge rate is C, at this time, C3>C>C4>C2>C1>C5. At this time, one candidate charge rate can be selected as the reduced charge ratio among the candidate charge rates C1, C2, C4, and C5. The charging rate of the battery.

In a preferred implementation process, the candidate charging magnification C4 can be taken as the charging magnification of the reduced battery in consideration of the range of the charging magnification adjustment interval between two adjacent charging magnifications. In a specific implementation process, if the environment of the battery or battery changes, and some may occur For example, other candidate charging rates lower than the candidate charging magnification C4 may be selected in the candidate set as the charging magnification of the battery after the reduction, which is not specifically limited in the embodiment of the present application.

Alternatively, for example, a charging magnification candidate set of the battery may be preset, and the charging magnification set may include at least one candidate charging magnification, such as C1, C2, . . . , Cn, and sort the candidate charging magnifications in the candidate set. For C7>C3>C5>...Cn, when it is detected that the usage data of the battery satisfies the condition of lowering the charging magnification of the battery, the charging magnification of the battery can be reduced, and one candidate charging magnification in the charging magnification candidate set can be sequentially selected according to the sorting result. As the charging rate of the reduced battery. If the charging magnification at this time is C3, after a certain cycle or accumulation time is detected, and the condition for lowering the charging magnification of the battery is detected, the C5 of the candidate charging magnification C3 in the charging magnification candidate set is selected according to the sorting result. As a reduced charging rate.

Alternatively, for another example, a charge rate candidate set of the battery may be preset, and the charge rate set may include at least one candidate charge rate, such as C1, C2, . . . , Cn, and determine values of C1, C2, C3, . . . The size relationship is C1>C2>C3>...Cn. At this time, when it is detected that the usage data of the battery satisfies the condition of lowering the charging magnification of the battery, the battery can be charged in the order of C1, C2, C3, ..., Cn. The decrease in magnification is equivalent to setting a specified value for each time the battery's charge rate is reduced.

It can be understood that the numerical order of the candidate charging magnifications in the charging magnification candidate set of the battery may be fixed or unfixed. For example, the charging magnification candidate set may be C1>C2>C3>...Cn, or may be C3>C5>C2>...Cn, etc., which is not specifically limited in the embodiment of the present application. Only one candidate charging rate lower than the charging rate of the current battery in the charging magnification candidate set of the battery is taken as the charging magnification of the reduced battery.

In a specific implementation process, the adjustment interval between the candidate charging magnifications in the charging magnification candidate set may be performed within a range of [0.1C, 2C]; in a preferred implementation process, the charging magnification candidate set is The adjustment interval between the candidate charge rates may be [0.3C, 1C].

It should be noted that, in the embodiment of the present application, as the battery is recycled, the adjustment interval between the candidate charging magnifications in the charging magnification candidate set may be set to gradually decrease, thereby avoiding the battery charging rate being reduced. A problem caused by a large decrease in battery capacity.

It should be noted that the charging ratio of the battery has a unique relationship with the charging current of the battery. Therefore, adjusting the charging magnification of the battery corresponds to adjusting the charging current of the battery, and adjusting the charging current of the battery is equivalent to adjusting the charging of the battery. Magnification. Therefore, adjust the charging rate of the battery, you can straight The charging rate of the battery is adjusted, or the charging rate of the battery can be adjusted by adjusting the charging current of the battery. This embodiment of the present application is not particularly limited.

It can be understood that if the charging rate of the battery is adjusted by adjusting the charging current of the battery, similar to the above method A and method B, the preset charging current can be adjusted, and thus, according to the preset charging current. Adjusting the interval to reduce the charging current of the battery; or, the charging current candidate set may be preset, the charging current candidate set includes at least one candidate charging current; a candidate of the charging current candidate set lower than the current battery charging current The charging current is used as the charging current of the reduced battery. This embodiment of the present application will not be described again.

Embodiment 5

The embodiment of the present application further provides an apparatus embodiment for implementing the steps and methods in the foregoing method embodiments. Please refer to FIG. 6 , which is a functional block diagram of a charging device for a battery according to an embodiment of the present application. As shown in Figure 6, the device includes:

The obtaining unit 61 is configured to acquire usage data of the battery, where the usage data of the battery includes at least one of a number of cycles of the battery and a cumulative time of the battery;

The determining unit 62 is configured to determine, according to the usage data of the battery, whether the condition for reducing the charging rate of the battery is satisfied;

The adjusting unit 63 is configured to reduce the charging rate of the battery if it is determined that the condition for reducing the charging rate of the battery is satisfied;

The charging unit 64 is configured to charge the battery according to the reduced charging magnification.

Specifically, in the embodiment of the present application, the number of cycles of the battery includes the total number of cycles of the battery and the power At least one of the number of cycles in the pool.

Specifically, in the embodiment of the present application, the accumulated time of the battery includes at least one of a total accumulated time of the battery and a cumulative time interval of the battery.

Specifically, in the embodiment of the present application, the determining unit 62 is specifically configured to:

If the usage data of the battery is the number of cycles of the battery, compare the number of cycles of the obtained battery with a corresponding number threshold;

If the number of cycles of the battery reaches a corresponding number threshold, it is judged that the condition for lowering the charging magnification of the battery is satisfied; or if the number of cycles of the battery does not reach the corresponding number threshold, it is judged that the condition for lowering the charging magnification of the battery is not satisfied.

If the usage data of the battery is the accumulated time of the battery, compare the accumulated time of the obtained battery with a corresponding time threshold;

If the accumulated time of the battery reaches the corresponding time threshold, it is judged that the condition for lowering the charging magnification of the battery is satisfied; or if the accumulated time of the battery does not reach the corresponding time threshold, it is determined that the condition for lowering the charging magnification of the battery is not satisfied.

Specifically, in the embodiment of the present application, the adjusting unit 63 is specifically configured to:

Adjust the interval according to the preset charging rate to reduce the charging rate of the battery; or,

One candidate charging magnification lower than the charging magnification of the battery in the preset charging magnification candidate set is taken as the charging magnification of the reduced battery; wherein the charging magnification candidate set includes at least one candidate charging magnification.

Specifically, in the embodiment of the present application, the obtaining unit 61 is specifically configured to:

Obtaining the number of cycles in which the battery performs one charging process and performing one discharging process as the number of cycles of the battery; or

Obtaining the number of times the maximum voltage of the battery reaches the charging upper limit voltage and the minimum voltage of the battery reaches the lower limit voltage of the discharge as the number of cycles of the battery; or

Specifically, in the embodiment of the present application, the charging unit 64 is specifically configured to:

According to the adjusted charging rate, constant current charging, pulse charging, step charging and constant current are used. The charging method is one of four charging modes in the charging, or a combined charging mode of at least two charging modes to charge the battery.

Before comparing the number of cycles of the obtained battery with the corresponding number threshold, dividing at least two temperature segments according to the temperature of the battery, and setting a corresponding number threshold for each temperature segment;

Based on the temperature segment, a threshold number corresponding to the temperature segment is determined.

Before comparing the accumulated time of the obtained battery with the corresponding time threshold, dividing at least two temperature segments according to the temperature of the battery, and setting a corresponding time threshold for each temperature segment;

Since the units in this embodiment can perform the method shown in FIG. 1, and the parts not described in detail in this embodiment, reference may be made to the related description of FIG.

Embodiment 6

The embodiment of the present application further provides a battery system. Please refer to FIG. 7 , which is a functional block diagram of a battery system provided by an embodiment of the present application.

As shown in FIG. 7, the battery system includes a battery 71 and a charging device 72 of the above battery.

Please refer to FIG. 8 , which is a first schematic diagram of a battery system according to an embodiment of the present application. As shown in FIG. 8 , the battery system includes a battery, a battery charging device, a temperature sensor, a cycle counter, an ammeter, and a voltmeter. Current source and voltage source.

Specifically, the schematic diagram of the battery system shown in FIG. 8 corresponds to the flow chart of the second embodiment of the charging method of the battery shown in FIG. 4.

In a specific implementation process, as shown in FIG. 8, an ammeter in the battery system is used to monitor the charging current of the battery during charging and transmit the monitoring result to the charging device of the battery of the battery system. A voltmeter in the battery system for measuring the voltage across the battery. A cycle counter in the battery system for receiving a voltage signal transmitted from the voltmeter and acquiring the number of cycles of the battery according to the method as described in the second embodiment. The cycle counter can transfer the number of cycles of the battery to the charging device of the battery. A temperature sensor in the battery system for measuring the temperature of the battery. A current source in the battery system for providing a controlled, constant charging current. a voltage source in the battery system for providing a controlled constant charging voltage

It can be understood that, in the battery system shown in FIG. 8, the connection manner of the galvanometer, the voltmeter, the temperature sensor, the cycle counter, the current source, the voltage source, the battery, and the charging device of the battery is only a specific implementation manner. It is not intended to limit the application.

Please refer to FIG. 9 , which is a second schematic diagram of a battery system according to an embodiment of the present application. As shown in FIG. 9 , the battery system includes a battery, a battery charging device, a temperature sensor, a time recorder, an ammeter, and a voltmeter. , current source and voltage source.

Specifically, the schematic diagram of the battery system shown in FIG. 9 corresponds to the flow chart of the third embodiment of the charging method of the battery shown in FIG. 5.

In a specific implementation process, as shown in FIG. 9, an ammeter in the battery system is used to monitor the charging current of the battery during charging and transmit the monitoring result to the charging device of the battery of the battery system. A voltmeter in the battery system for measuring the voltage across the battery. A time recorder in the battery system for acquiring the accumulated time of the battery according to the method as described in the third embodiment. A temperature sensor in the battery system for measuring the temperature of the battery. A current source in the battery system for providing a controlled, constant charging current. a voltage source in the battery system for providing controllable Constant charging voltage

It can be understood that, in the battery system shown in FIG. 9, the connection manner of the galvanometer, the voltmeter, the temperature sensor, the time recorder, the current source, the voltage source, the battery, and the charging device of the battery is only a specific implementation manner. It is not intended to limit the application.

For the parts not described in detail in this embodiment, reference may be made to the related description of FIGS. 1-7.

The battery system provided by the present application comprehensively considers the influence of the storage process of the battery on the deterioration of the battery performance and the influence of the recycling process of the battery on the deterioration of the battery performance, and can be used to indicate the use of the battery by obtaining the number of cycles and the accumulated time of the battery. Data, and determining whether the preset condition is satisfied according to the usage data, thereby determining whether to reduce the charging rate of the battery; and, when the preset condition is satisfied, appropriately adjusting the charging rate of the battery, and adjusting according to the adjustment After the charging rate, the battery is charged, so that the polarization speed of the battery is slowed down; thus, the speed of accumulating by-products of the anode and cathode of the battery is slowed down, so that the destruction rate of the crystal form of the cathode material of the battery is slowed, and the oxidation of the electrolyte is slowed down. The decomposition speed is slower; in turn, the loss rate of the battery during the cycle charging process is slowed down to some extent, and the cycle life of the battery is prolonged.

A person skilled in the art can clearly understand that for the convenience and brevity of the description, the specific working process of the system, the device and the unit described above can refer to the corresponding process in the foregoing method embodiment, and details are not described herein again.

In the several embodiments provided by the present application, it should be understood that the disclosed system, apparatus, and method may be implemented in other manners. For example, the device embodiments described above are merely illustrative. For example, the division of the unit is only a logical function division. In actual implementation, there may be another division manner. For example, multiple units or components may be combined. Or it can be integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interface, device or unit, and may be in an electrical, mechanical or other form.

The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, may be located in one place, or may be distributed to multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of the embodiment.

In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit. It is also possible that each unit physically exists alone, or two or more units may be integrated in one unit. The above integrated unit can be implemented in the form of hardware or in the form of hardware plus software functional units.

The above-described integrated unit implemented in the form of a software functional unit can be stored in a computer readable storage medium. The software functional unit described above is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) or a processor (PTocessoT) to perform the methods described in various embodiments of the present application. Part of the steps. The foregoing storage medium includes: a U disk, a mobile hard disk, a read only memory (Tead-Only MemoTy, TOM), a random access memory (Tamom Access MemoTy, TAM), a magnetic disk, or an optical disk, and the like, which can store program code. .

The above is only the preferred embodiment of the present application, and is not intended to limit the present application. Any modifications, equivalent substitutions, improvements, etc., which are made within the spirit and principles of the present application, should be included in the present application. Within the scope of protection.

Claims

A charging method for a battery, characterized in that the method comprises:

Obtaining usage data of the battery, the usage data of the battery including at least one of a number of cycles of the battery and a cumulative time of the battery;

Determining, according to the usage data of the battery, whether a condition for reducing the charging rate of the battery is satisfied;

If it is determined that the condition for reducing the charging rate of the battery is satisfied, the charging rate of the battery is decreased;

The battery is charged according to the reduced charging rate.
The method of claim 1 wherein the number of cycles of the battery comprises at least one of a total number of cycles of the battery and a cycle number interval of the battery.
The method of claim 1 wherein the accumulated time of the battery comprises at least one of a total accumulated time of the battery and a cumulative time interval of the battery.
The method according to claim 1 or 2, wherein if the usage data of the battery is the number of cycles of the battery, determining whether the condition for lowering the charging rate of the battery is satisfied according to usage data of the battery ,include:

Comparing the obtained number of cycles of the battery with a corresponding number threshold;

If the number of cycles of the battery reaches the corresponding threshold of the number, it is determined that the condition for reducing the charging rate of the battery is satisfied; or if the number of cycles of the battery does not reach the corresponding threshold, the determination is not satisfied. A condition for lowering the charging rate of the battery.
The method according to claim 1 or 3, wherein if the usage data of the battery is the accumulated time of the battery, determining whether the condition for reducing the charging rate of the battery is satisfied according to the usage data of the battery ,include:

Comparing the obtained accumulated time of the battery with a corresponding time threshold;

If the accumulated time of the battery reaches the corresponding time threshold, it is determined that the condition for reducing the charging rate of the battery is satisfied; or if the accumulated time of the battery does not reach the corresponding time threshold, it is determined that the time is not satisfied. A condition for lowering the charging rate of the battery.
The method of claim 1 wherein reducing the charge rate of the battery comprises:

Decrease the charging rate of the battery according to a preset charging magnification adjustment interval; or

One candidate charging rate lower than the charging magnification of the battery in the preset charging magnification candidate set is taken as the charging magnification of the battery after the reduction; wherein the charging magnification candidate set includes at least one candidate charging magnification.
The method according to claim 1 or 2, wherein if the usage data of the battery is the number of cycles, obtaining usage data of the battery comprises:

Obtaining a number of times that the battery performs a charging process and performing a discharging process as a number of cycles of the battery; or

Obtaining a number of times that a maximum voltage of the battery reaches a charging upper limit voltage and a minimum voltage of the battery reaches a lower discharge voltage as a number of cycles of the battery; or

Obtaining the number of times that the maximum remaining power of the battery reaches the remaining power corresponding to the charging upper limit voltage and the minimum remaining power of the battery reaches the remaining power corresponding to the lower limit voltage of the battery as the number of cycles of the battery.
The method according to claim 1, wherein charging the battery according to the adjusted charging magnification comprises:

According to the adjusted charging rate, one of four charging modes of constant current charging, pulse charging, step charging, and constant current constant voltage charging, or a combined charging mode of at least two charging modes, The battery is charged.
The method of claim 4, wherein before the obtained number of cycles of the battery is compared with a corresponding number threshold, the method further comprises:

Dividing at least two temperature segments according to the temperature of the battery, and setting a corresponding number threshold for each temperature segment;

Determining a temperature segment corresponding to a current temperature of the battery according to a current temperature of the battery;

A threshold number corresponding to the temperature segment is determined based on the temperature segment.
The method of claim 5, wherein the method further comprises: comparing the obtained accumulated time of the battery with a corresponding time threshold;

Dividing at least two temperature segments according to a temperature of the battery, and setting a corresponding time threshold for each temperature segment;

Determining a temperature segment corresponding to a current temperature of the battery according to a current temperature of the battery;

A time threshold corresponding to the temperature segment is determined based on the temperature segment.
A charging device for a battery, characterized in that the square device comprises:

An obtaining unit, configured to acquire usage data of a battery, where usage data of the battery includes at least one of a number of cycles of the battery and a cumulative time of the battery;

a determining unit, configured to determine, according to the usage data of the battery, whether a condition for reducing a charging rate of the battery is satisfied;

An adjusting unit, configured to reduce a charging rate of the battery if it is determined that the condition for reducing the charging rate of the battery is satisfied;

And a charging unit configured to charge the battery according to the reduced charging rate.
The apparatus according to claim 11, wherein the number of cycles of said battery comprises at least one of a total number of cycles of said battery and a cycle number interval of said battery.
The apparatus of claim 11 wherein said accumulated time of said battery comprises at least one of a total accumulated time of said battery and a cumulative time interval of said battery.
The device according to claim 11 or 12, wherein, if the usage data of the battery is the number of cycles of the battery, the determining unit is specifically configured to:

Comparing the obtained number of cycles of the battery with a corresponding number threshold;

If the number of cycles of the battery reaches the corresponding threshold of the number, it is determined that the condition for reducing the charging rate of the battery is satisfied; or if the number of cycles of the battery does not reach the corresponding threshold, the determination is not satisfied. A condition for lowering the charging rate of the battery.
The device according to claim 11 or 13, wherein if the usage data of the battery is the accumulated time of the battery, the determining unit is specifically configured to:

Comparing the obtained accumulated time of the battery with a corresponding time threshold;

If the accumulated time of the battery reaches the corresponding time threshold, it is determined that the condition for reducing the charging rate of the battery is satisfied; or if the accumulated time of the battery does not reach the corresponding time threshold, it is determined that the time is not satisfied. A condition for lowering the charging rate of the battery.
The device according to claim 11, wherein the adjusting unit is specifically configured to:

Decrease the charging rate of the battery according to a preset charging magnification adjustment interval; or

One candidate charging rate lower than the charging magnification of the battery in the preset charging magnification candidate set is taken as the charging magnification of the battery after the reduction; wherein the charging magnification candidate set includes at least one candidate charging magnification.
The device according to claim 11 or 12, wherein if said battery is made Using the data as the number of cycles, the obtaining unit is specifically configured to:

Obtaining a number of times that the battery performs a charging process and performing a discharging process as a number of cycles of the battery; or

Obtaining a number of times that a maximum voltage of the battery reaches a charging upper limit voltage and a minimum voltage of the battery reaches a lower discharge voltage as a number of cycles of the battery; or

Obtaining the number of times that the maximum remaining power of the battery reaches the remaining power corresponding to the charging upper limit voltage and the minimum remaining power of the battery reaches the remaining power corresponding to the lower limit voltage of the battery as the number of cycles of the battery.
The device according to claim 11, wherein the charging unit is specifically configured to:

According to the adjusted charging rate, one of four charging modes of constant current charging, pulse charging, step charging, and constant current constant voltage charging, or a combined charging mode of at least two charging modes, The battery is charged.
The device according to claim 14, wherein the determining unit is specifically configured to:

Before comparing the obtained number of cycles of the battery with a corresponding number threshold, dividing at least two temperature segments according to the temperature of the battery, and setting a corresponding number threshold for each temperature segment;

Determining a temperature segment corresponding to a current temperature of the battery according to a current temperature of the battery;

A threshold number corresponding to the temperature segment is determined based on the temperature segment.
The device according to claim 15, wherein the determining unit is specifically configured to:

Before comparing the obtained accumulated time of the battery with a corresponding time threshold, dividing at least two temperature segments according to the temperature of the battery, and setting a corresponding time threshold for each temperature segment;

Determining a temperature segment corresponding to a current temperature of the battery according to a current temperature of the battery;

A time threshold corresponding to the temperature segment is determined based on the temperature segment.
A battery system, characterized in that the battery system comprises a battery and a charging device for the battery according to any one of claims 11 to 20.