CN114243834A - Battery charging protection method and device - Google Patents
Battery charging protection method and device Download PDFInfo
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- CN114243834A CN114243834A CN202111544341.1A CN202111544341A CN114243834A CN 114243834 A CN114243834 A CN 114243834A CN 202111544341 A CN202111544341 A CN 202111544341A CN 114243834 A CN114243834 A CN 114243834A
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- 238000000034 method Methods 0.000 title claims abstract description 28
- 230000001960 triggered effect Effects 0.000 claims abstract description 22
- 238000004880 explosion Methods 0.000 description 5
- 238000002485 combustion reaction Methods 0.000 description 4
- 230000002269 spontaneous effect Effects 0.000 description 4
- 230000002159 abnormal effect Effects 0.000 description 3
- 230000009471 action Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000008569 process Effects 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00304—Overcurrent protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00308—Overvoltage protection
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00309—Overheat or overtemperature protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application discloses a battery charging protection method and a device, which relate to the technical field of battery pack charging or control, and the method comprises the following steps: after a battery is connected with an external charger, collecting a plurality of working condition group parameters of the battery in real time, wherein the working condition group parameters comprise one or more different working condition parameters; determining different protection modes triggered by the collected working condition group parameters, wherein the protection modes have different priorities; if the protection mode exists and only one protection mode is triggered, executing the protection mode; if a plurality of protection modes are triggered simultaneously, only the protection mode with the highest priority is executed. According to the method and the device, all working condition parameters of the battery are comprehensively monitored during battery charging, a more appropriate protection mode is determined by dividing working condition groups according to the working condition parameters, and the most appropriate protection mode is determined by selecting the priority when a plurality of protection modes conflict with each other, so that the reliability and the safety of the battery during charging are ensured.
Description
Technical Field
The present disclosure relates to the field of battery charging or battery control technologies, and in particular, to a battery charging protection method and apparatus.
Background
With the rapid development of economy, electric vehicles or battery cars or other electric equipment have entered into people's lives, however, the spontaneous combustion/explosion of electric vehicles still often happens.
In the related art, the load overcurrent or overvoltage is limited simply to prevent the battery from spontaneous combustion/explosion, and the current or voltage cannot be regulated, so that the safety protection is not in place due to the fixed setting of the protection threshold, and the damage probability of the battery is also increased.
However, the cause of spontaneous combustion/explosion of the battery is complicated, and how to improve the safety and reliability of the battery in charging is urgent.
Disclosure of Invention
The embodiment of the application provides a battery charging protection method and device, which aim to solve the problem that the safety protection of spontaneous combustion/explosion of a battery in the related art is not in place.
In a first aspect, a battery charging protection method is provided, which includes the following steps:
after a battery is connected with an external charger, collecting a plurality of working condition group parameters of the battery in real time, wherein the working condition group parameters comprise one or more different working condition parameters;
determining different protection modes triggered by the collected working condition group parameters, wherein the protection modes have different priorities;
if the protection mode exists and only one protection mode is triggered, executing the protection mode;
if a plurality of protection modes are triggered simultaneously, only the protection mode with the highest priority is executed.
In some embodiments, the first set of operating conditions includes voltage and current;
and if the acquired voltage exceeds a set voltage threshold or the acquired current exceeds a set current threshold, triggering a first protection mode, wherein the first protection mode is used for adjusting a battery charging loop.
In some embodiments, the step of adjusting the battery charging loop comprises:
calculating to obtain power according to the acquired voltage and current, and generating a PWM control signal based on the power;
and adjusting the resistance value of the battery charging loop according to the generated PWM control signal.
In some embodiments, the step of adjusting the battery charging loop further comprises:
and after a set time threshold or a set adjustment number, if the acquired voltage still exceeds a set voltage threshold or the acquired current still exceeds a set current threshold, cutting off the battery charging loop.
In some embodiments, the second set of operating conditions includes an amount of power;
and if the collected electric quantity exceeds a set electric quantity threshold value, triggering a second protection mode, wherein the second protection mode is to directly cut off the battery charging loop.
In some embodiments, the second set of operating conditions further comprises temperature;
and if the collected electric quantity exceeds a set electric quantity threshold value or the collected temperature exceeds a set temperature threshold value, triggering the second protection mode.
In some embodiments, the charge threshold of the current charge is determined by a preset temperature-charge threshold look-up table based on the current temperature query.
In some embodiments, the second protection mode has a higher priority than the first protection mode.
In a second aspect, there is also provided a battery charging protection device, comprising;
the battery charger comprises a working condition acquisition device, a storage device and a control device, wherein the working condition acquisition device is used for acquiring a plurality of working condition group parameters of a battery in real time after the battery is connected with an external charger, and the working condition group parameters comprise one or more different working condition parameters;
the processor is used for determining different protection modes triggered by the acquired working condition group parameters, and the protection modes have different priorities;
if the protection mode exists and only one protection mode is triggered, executing the protection mode;
if a plurality of protection modes are triggered simultaneously, only the protection mode with the highest priority is executed.
In some embodiments, the set of operating conditions includes a first set of operating conditions including voltage and current and a second set of operating conditions including electrical quantity and temperature.
The beneficial effect that technical scheme that this application provided brought includes:
the method comprises the steps of comprehensively monitoring various working condition parameters of the battery during charging of the battery, dividing working condition groups according to the working condition parameters to determine a more proper protection mode, and selecting priorities to determine the most proper protection mode when a plurality of protection modes conflict so as to ensure the reliability and safety of the battery during charging.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the description of the embodiments are briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present application, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
Fig. 1 is a block flow diagram of a battery charging protection method according to an embodiment of the present disclosure;
fig. 2 is a block diagram of a battery charging protection device according to an embodiment of the present disclosure.
The implementation, functional features and advantages of the objectives of the present application will be further explained with reference to the accompanying drawings.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The flow diagrams depicted in the figures are merely illustrative and do not necessarily include all of the elements and operations/steps, nor do they necessarily have to be performed in the order depicted. For example, some operations/steps may be decomposed, combined or partially combined, so that the actual execution sequence may be changed according to the actual situation.
The embodiment of the application provides a battery charging protection method, which is characterized in that each working condition parameter of a battery is comprehensively monitored during battery charging, a more proper protection mode is determined by dividing working condition groups according to the working condition parameters, and the most proper protection mode is determined by selecting priority when a plurality of protection modes conflict with each other, so that the reliability and the safety of the battery during charging are ensured.
Some embodiments of the present application will be described in detail below with reference to the accompanying drawings. The embodiments described below and the features of the embodiments can be combined with each other without conflict.
As shown in fig. 1, an embodiment of the present application provides a battery charging protection method, including the following steps:
after a battery is connected with an external charger, collecting a plurality of working condition group parameters of the battery in real time, wherein the working condition group parameters comprise one or more different working condition parameters;
determining different protection modes triggered by the collected working condition group parameters, wherein the protection modes have different priorities;
if the protection mode exists and only one protection mode is triggered, executing the protection mode;
if a plurality of protection modes are triggered simultaneously, only the protection mode with the highest priority is executed.
In the embodiment, the battery charging protection method is used in a scene after the battery is connected with an external charger, namely the battery is in a charging state, and various working condition parameters of the battery are collected in real time and are divided into a plurality of working condition group parameters according to the electrical characteristics of the working condition parameters, wherein one working condition group parameter is matched with one protection mode; whether the corresponding protection mode needs to be acted or not can be determined according to all monitored working condition parameters; if the protection mode is not used, the step of carrying out protection mode interference is not needed; if one and only one protection mode needs to be acted, the protection mode is directly executed; if a plurality of protection modes need to be acted, executing the protection mode with the highest priority according to the priority of each protection mode.
Further, the first set of operating conditions includes voltage and current; and if the acquired voltage exceeds a set voltage threshold or the acquired current exceeds a set current threshold, triggering a first protection mode, wherein the first protection mode is used for adjusting a battery charging loop.
In this embodiment, if the collected voltage exceeds the voltage threshold, the voltage is an overvoltage, and if the collected current exceeds the current threshold, the current is an overcurrent. Whether overcurrent or overvoltage is abnormal, the first protection mode can be triggered to work when overvoltage or overcurrent occurs.
Further, the specific steps of adjusting the battery charging loop include:
calculating to obtain power according to the acquired voltage and current, and generating a PWM control signal based on the power;
and adjusting the resistance value of the battery charging loop according to the generated PWM control signal.
In this embodiment, the collected voltage and current not only determine whether an over-current or an over-voltage occurs, but also calculate power according to the collected voltage and current to generate a corresponding duty ratio signal, that is, a PWM control signal, to control a total resistance value connected to the battery charging circuit when the over-voltage or the over-current occurs.
It is noted that after the battery charging circuit is adjusted, when the collected voltage and current are stable, the connection of the plurality of unit resistors on the battery charging circuit is restored. And the resistance on the battery charging loop is increased with respect to adjusting the resistance in the battery charging loop.
Further, the step of adjusting the battery charging loop further comprises:
and after a set time threshold or a set adjustment number, if the acquired voltage still exceeds a set voltage threshold or the acquired current still exceeds a set current threshold, cutting off the battery charging loop.
Generally, the overvoltage or overcurrent phenomenon is instantaneous, and if the overvoltage or overcurrent is applied for a long time, the battery is likely to be abnormal. Accordingly, if the voltage is still excessive or excessive after the predetermined time threshold has elapsed, the battery charging circuit is shut off because the battery charging circuit is not temporarily abnormal.
In a specific embodiment, the change of the resistor is discrete, so that the adjustment condition is limited according to the stepped rise of the resistor, and if the overvoltage or overcurrent phenomenon cannot be avoided after the maximum resistance value is adjusted, the battery charging loop is cut off to be a safer measure; it is of course also possible to vary the resistance value in such a case that the overvoltage or overcurrent situation still cannot be solved, and then to switch off the battery charging circuit.
Further, the second operating condition group parameter includes an electric quantity;
and if the collected electric quantity exceeds a set electric quantity threshold value, triggering a second protection mode, wherein the second protection mode is to directly cut off the battery charging loop.
The electrical characteristics reflected by the operating condition parameter voltage and the operating condition parameter current in the first operating condition group parameter are different from the operating condition parameters in the second operating condition group parameter, for example, if the collected electric quantity exceeds the electric quantity threshold value, the battery is fully charged and does not need to be charged continuously, and if the battery is charged continuously, the battery is likely to explode, so that the second protection mode acts after the battery is determined to be fully charged, namely, the battery charging loop is directly cut off.
Still further, the second set of operating conditions further includes temperature;
and if the collected electric quantity exceeds a set electric quantity threshold value or the collected temperature exceeds a set temperature threshold value, triggering the second protection mode.
Specifically, the temperature threshold is 38 ℃, and when the collected temperature exceeds 38 ℃, that is, the temperature is over-charged, which is similar to the over-charging, when the battery is continuously charged, the possibility of explosion of the battery is increased, and therefore, the battery charging circuit is directly cut off when the temperature is over-charged or over-charged.
Preferably, the charge threshold value of the current charge is determined by a preset temperature-charge threshold value look-up table based on the current temperature query.
It should be noted that, the electric quantity when fully charged is different at different temperatures, and in order to ensure that whether the electric quantity is overcharged can be more accurately judged, the selection of the electric quantity threshold value is determined according to the temperature-electric quantity threshold value comparison table so as to ensure that the judgment result is more accurate.
Further, the second protection mode has a higher priority than the first protection mode.
In the present embodiment, the second protection mode is to directly disconnect the battery charging circuit, and the first protection mode is to adjust the battery charging circuit first and then disconnect the battery charging circuit when the adjustment is not expected. For example, overvoltage or overcurrent may occur in a short period of time, the battery charging circuit is adjusted to eliminate the overvoltage or overcurrent, and the battery charging circuit is switched off when the adjustment is not possible; and the battery is continuously charged by over-charging and over-temperature, the electric quantity and the temperature are continuously increased, and then the battery charging loop is directly cut off after the over-charging and over-temperature are still performed subsequently. When both the first protection mode and the second protection mode are required to be active, the second protection mode may be executed.
As shown in fig. 2, an embodiment of the present application further provides a battery charging protection device, including;
the battery charger comprises a working condition acquisition device, a storage device and a control device, wherein the working condition acquisition device is used for acquiring a plurality of working condition group parameters of a battery in real time after the battery is connected with an external charger, and the working condition group parameters comprise one or more different working condition parameters;
the processor is used for determining different protection modes triggered by the acquired working condition group parameters, and the protection modes have different priorities;
if the protection mode exists and only one protection mode is triggered, executing the protection mode;
if a plurality of protection modes are triggered simultaneously, only the protection mode with the highest priority is executed.
As a preferred embodiment, the operating condition group parameters include a first operating condition group parameter and a second operating condition group parameter, the first operating condition group parameter includes a voltage and a current, and the second operating condition group parameter includes an electric quantity and a temperature.
Wherein, the voltage and the current can reflect the problems of overvoltage and overcurrent, and the electric quantity and the temperature can reflect the conditions of overcharge and overtemperature. If both overvoltage and overcurrent are likely to occur in a short period of time, then the battery charging circuit is adjusted so that the overvoltage or overcurrent is eliminated, and the battery charging circuit is switched off when the adjustment is not possible. And the battery is continuously charged by the overcharge and the overtemperature, the electric quantity and the temperature are continuously increased, and then the battery charging loop is directly cut off after the overcharge and the overtemperature are still performed subsequently.
Preferably, the charge threshold value of the current charge is determined by a preset temperature-charge threshold value look-up table based on the current temperature query.
It should be noted that, the electric quantity when fully charged is different at different temperatures, and in order to ensure that whether the electric quantity is overcharged can be more accurately judged, the selection of the electric quantity threshold value is determined according to the temperature-electric quantity threshold value comparison table so as to ensure that the judgment result is more accurate.
Further, the second protection mode has a higher priority than the first protection mode.
In the present embodiment, the second protection mode is to directly disconnect the battery charging circuit, and the first protection mode is to adjust the battery charging circuit first and then disconnect the battery charging circuit when the adjustment is not expected. When both the first protection mode and the second protection mode are required to be active, the second protection mode may be executed.
The embodiments of the apparatus provided in the embodiments of the present application have been explained in detail in the above method embodiments, and are not repeated herein.
In the description of the present application, it should be noted that the terms "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience in describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed in a specific orientation, and operate, and thus, should not be construed as limiting the present application. Unless expressly stated or limited otherwise, the terms "mounted," "connected," and "connected" are intended to be inclusive and mean, for example, that they may be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It is noted that, in the present application, relational terms such as "first" and "second", and the like, are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
The above description is merely exemplary of the present application and is presented to enable those skilled in the art to understand and practice the present application. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the application. Thus, the present application is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (10)
1. A battery charging protection method is characterized by comprising the following steps:
after a battery is connected with an external charger, collecting a plurality of working condition group parameters of the battery in real time, wherein the working condition group parameters comprise one or more different working condition parameters;
determining different protection modes triggered by the collected working condition group parameters, wherein the protection modes have different priorities;
if the protection mode exists and only one protection mode is triggered, executing the protection mode;
if a plurality of protection modes are triggered simultaneously, only the protection mode with the highest priority is executed.
2. The battery charge protection method of claim 1, wherein:
the first set of operating conditions includes voltage and current;
and if the acquired voltage exceeds a set voltage threshold or the acquired current exceeds a set current threshold, triggering a first protection mode, wherein the first protection mode is used for adjusting a battery charging loop.
3. The battery charge protection method of claim 2, wherein the step of adjusting the battery charge loop comprises:
calculating to obtain power according to the acquired voltage and current, and generating a PWM control signal based on the power;
and adjusting the resistance value of the battery charging loop according to the generated PWM control signal.
4. The battery charge protection method of claim 3, wherein said step of adjusting the battery charge loop further comprises:
and after a set time threshold or a set adjustment number, if the acquired voltage still exceeds a set voltage threshold or the acquired current still exceeds a set current threshold, cutting off the battery charging loop.
5. The battery charge protection method of claim 3, wherein:
the second operating condition group parameter comprises electric quantity;
and if the collected electric quantity exceeds a set electric quantity threshold value, triggering a second protection mode, wherein the second protection mode is to directly cut off the battery charging loop.
6. The battery charge protection method of claim 5, wherein:
the second set of operating conditions further comprises temperature;
and if the collected electric quantity exceeds a set electric quantity threshold value or the collected temperature exceeds a set temperature threshold value, triggering the second protection mode.
7. The battery charge protection method of claim 5 or 6, wherein the charge threshold of the current charge is determined by a preset temperature-charge threshold look-up table based on the current temperature query.
8. The battery charge protection method of claim 5, wherein:
the second protection mode has a higher priority than the first protection mode.
9. A battery charge protection device, comprising;
the battery charger comprises a working condition acquisition device, a storage device and a control device, wherein the working condition acquisition device is used for acquiring a plurality of working condition group parameters of a battery in real time after the battery is connected with an external charger, and the working condition group parameters comprise one or more different working condition parameters;
the processor is used for determining different protection modes triggered by the acquired working condition group parameters, and the protection modes have different priorities;
if the protection mode exists and only one protection mode is triggered, executing the protection mode;
if a plurality of protection modes are triggered simultaneously, only the protection mode with the highest priority is executed.
10. The battery charge protection device of claim 9, wherein:
the working condition group parameters comprise a first working condition group parameter and a second working condition group parameter, the first working condition group parameter comprises voltage and current, and the second working condition group parameter comprises electric quantity and temperature.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111544341.1A CN114243834A (en) | 2021-12-16 | 2021-12-16 | Battery charging protection method and device |
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| CN202111544341.1A CN114243834A (en) | 2021-12-16 | 2021-12-16 | Battery charging protection method and device |
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| CN114243834A true CN114243834A (en) | 2022-03-25 |
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Application publication date: 20220325 |