WO2023240637A1

WO2023240637A1 - Battery temperature detection method, battery temperature detection circuit and apparatus

Info

Publication number: WO2023240637A1
Application number: PCT/CN2022/099596
Authority: WO
Inventors: 叶力力; 田富涛
Original assignee: 北京小米移动软件有限公司
Priority date: 2022-06-17
Filing date: 2022-06-17
Publication date: 2023-12-21
Also published as: CN117716560A

Abstract

A battery temperature detection method, circuit and apparatus. The battery temperature detection circuit comprises: a first thermistor fixed on a first protection plate in an SMD form, and a second thermistor fixed on a second protection plate in the SMD form, the first protection plate and the second protection plate being respectively disposed on the front and back surfaces of a battery cell. The battery cell temperature detection method comprises: determining a first temperature on the basis of a first thermistor, and determining a second temperature on the basis of a second thermistor (S11); and determining the temperature of a battery cell on the basis of the first temperature and the second temperature (S12). The first thermistor and the second thermistor can acquire the temperatures of the front and back surfaces of the battery cell, so that a temperature estimation error caused by inconsistent temperatures of the front and back surfaces of the battery cell is avoided, and compared with a single SMD thermistor, the trustworthiness of the temperature is improved.

Description

Battery temperature detection method, battery temperature detection circuit and device

Technical field

The present disclosure relates to the field of battery technology, and in particular, to a battery temperature detection method, battery temperature detection circuit and device.

Background technique

With the continuous improvement of living standards and the advancement of the times, electronic products continue to develop and be updated, and they have become a necessity in life. Most electronic products rely on batteries to power them, so battery safety is increasingly important. In order to prevent the battery temperature from being too high, the battery temperature will be detected. The thermistor is a sensor resistor whose resistance changes with changes in temperature. It has high sensitivity, a wide operating temperature range and strong stability. It is often made into a dedicated detection element.

In related technologies, methods for collecting battery temperature include: using lead-type NTC to be directly bonded to the battery core, or using a single NTC on the battery's protection plate plus the NTC on the motherboard to fit the temperature. However, in actual application scenarios, using leaded NTC to collect cell temperature will cause trouble in PCB layout and production process, and the combined angle and position will directly affect the sampling accuracy. Using a single SMD NTC will lead to large temperature estimation errors, low reliability, and increase the burden on the CPU.

Contents of the invention

In order to overcome the problems existing in related technologies, the present disclosure provides a battery temperature detection method, circuit and device for accurately measuring the temperature of the battery.

According to a first aspect of an embodiment of the present disclosure, a method for detecting battery core temperature is provided, which is applied to a battery temperature detection circuit. The battery temperature detection circuit includes: a first thermal sensor fixed on a first protection plate in the form of a patch. resistor, and a second thermistor fixed on the second protection plate in the form of a patch, the first protection plate and the second protection plate being respectively arranged on the front and back of the battery core; the method includes: based on the The first thermistor determines a first temperature, and determines a second temperature based on the second thermistor; based on the first temperature and the second temperature, the temperature of the battery core is determined.

In one embodiment, the third temperature is determined based on a third thermistor; the third thermistor is fixed in the form of a patch at a center position corresponding to the heating device installed on the first protection board; based on Determining the temperature of the battery core at the first temperature and the second temperature includes: determining the temperature of the battery core based on the first temperature, the second temperature, and the third temperature.

In one embodiment, the fourth temperature is determined based on a fourth thermistor; the fourth thermistor is fixed in the form of a patch on the second protection plate close to the controller; based on the first temperature and the second temperature, determining the temperature of the battery core, including: determining the temperature of the battery core based on the first temperature, the second temperature, and the fourth temperature.

In one embodiment, the third temperature is determined based on a third thermistor; the third thermistor is fixed in the form of a patch at a center position corresponding to the heating device installed on the first protection board; based on The fourth thermistor determines the fourth temperature; the fourth thermistor is fixed in the form of a patch on the second protection plate close to the controller; based on the first temperature and the second temperature, determine The temperature of the battery core includes: determining the temperature of the battery core based on the first temperature, the second temperature, the third temperature and the fourth temperature.

In one embodiment, determining the temperature of the battery core based on the first temperature, the second temperature, the third temperature and the fourth temperature includes: determining the first temperature and the the average temperature between the second temperatures; perform weighting processing on the average temperature, the third temperature and the fourth temperature to obtain the temperature of the battery core.

In one embodiment, the battery temperature detection circuit further includes: a main control chip configured to perform the step of determining the temperature of the battery core based on the first temperature and the second temperature.

In one embodiment, the method further includes: before the main control chip performs the step of determining the temperature of the battery core based on the first temperature and the second temperature, based on the battery core The power and/or current of the core determines that the main control chip is in working condition.

In one embodiment, the method further includes: if it is determined that the main control chip is in a sleep state based on the power and/or current of the battery core, periodically waking up the main control chip and executing the step based on The first temperature and the second temperature are the steps of determining the temperature of the battery core.

According to a second aspect of the embodiment of the present disclosure, a battery temperature detection circuit is provided, including: a first protection board and a second protection board, respectively located on the front and back of the battery core; a first thermistor in the form of a patch Fixed on the first protective plate, used to determine the first temperature; a second thermistor, fixed on the second protective plate in the form of a patch, used to determine the second temperature; a main control chip, arranged on the The first protection plate or the second protection plate is used to determine the temperature of the battery core based on the first temperature and the second temperature.

In one embodiment, the first thermistor is fixed on the first edge of the first protection plate away from the heating device installed on the protection plate and close to the battery core; the second thermistor The second protective plate is fixed away from the heating device installed on the protective plate and close to the second edge of the battery core.

In one embodiment, there are more heating devices installed on the first protection board than on the second protection board; the battery circuit also includes: a third thermistor in the form of a patch The corresponding center position of the heating device installed on the first protection plate is fixed and used to determine the third temperature.

In one embodiment, the battery circuit further includes: a fourth thermistor, fixed in the form of a patch on the second protection plate close to the controller, for determining the fourth temperature.

According to a third aspect of the embodiment of the present disclosure, a battery temperature detection device is provided, which is applied to a battery temperature detection circuit. The battery temperature detection circuit includes: a first thermistor fixed on a first protection board in the form of a patch. , and a second thermistor fixed on the second protection board in the form of a patch. The first protection board and the second protection board are respectively arranged on the front and back sides of the battery core. The device includes: a detection unit for The first thermistor determines the first temperature, and the second thermistor determines the second temperature; the processing unit is configured to determine the temperature of the battery core based on the first temperature and the second temperature.

In one embodiment, the detection unit is further configured to determine a third temperature based on a third thermistor; the third thermistor is fixed in the form of a patch on the heating element installed on the first protection plate. The corresponding center position of the device; the processing unit determines the temperature of the battery core based on the first temperature and the second temperature in the following manner: based on the first temperature, the second temperature and the third temperature. Three temperatures, determine the temperature of the battery core.

In one embodiment, the detection unit is also used to determine the fourth temperature based on a fourth thermistor; the fourth thermistor is fixed in the form of a patch on the second protection plate close to the controller. ; The processing unit determines the temperature of the battery core based on the first temperature and the second temperature in the following manner: based on the first temperature, the second temperature and the fourth temperature, determines the temperature of the battery core. Describe the temperature of the battery core.

In one embodiment, the detection unit is further configured to determine a third temperature based on a third thermistor; the third thermistor is fixed in the form of a patch on the heating element installed on the first protection plate. The corresponding center position of the device; and determining the fourth temperature based on the fourth thermistor; the fourth thermistor is fixed in the form of a patch on the second protection plate close to the controller; the processing unit adopts the following method The method determines the temperature of the battery core based on the first temperature and the second temperature: based on the first temperature, the second temperature, the third temperature and the fourth temperature, determines the Cell temperature.

In one implementation, the processing unit determines the temperature of the battery core based on the first temperature, the second temperature, the third temperature and the fourth temperature in the following manner: determining the The average temperature between the first temperature and the second temperature; perform weighting processing on the average temperature, the third temperature and the fourth temperature to obtain the temperature of the battery core.

In one embodiment, the device further includes: before the main control chip performs the step of determining the temperature of the battery core based on the first temperature and the second temperature, the processing unit Based on the power and/or current of the battery core, it is determined that the main control chip is in a working state.

In one embodiment, the device further includes: if the processing unit determines that the main control chip is in a sleep state based on the power and/or current of the battery core, the processing unit periodically wakes up the main control chip. The main control chip performs the step of determining the temperature of the battery core based on the first temperature and the second temperature.

According to a fourth aspect of the embodiment of the present disclosure, a battery temperature detection device is provided, including: a processor; a memory for storing instructions executable by the processor; wherein the processor is configured to: execute any implementation of the first aspect The battery temperature detection method described in the method.

According to a fifth aspect of the embodiments of the present disclosure, a storage medium is provided. Instructions are stored in the storage medium. When the instructions in the storage medium are executed by a processor of the terminal, the terminal can execute any one of the first aspects. The battery temperature detection method described in the first embodiment.

The technical solution provided by the embodiment of the present disclosure may include the following beneficial effects: The battery temperature detection circuit includes: a first protection plate and a second protection plate symmetrically arranged on the front and back of the battery core, and the first thermistor is fixed in the form of a patch. The first protection board and the second thermistor are fixed on the second protection board in the form of patches. Therefore, the temperature of the front and back sides of the battery core can be collected through the first thermistor and the second thermistor to prevent the front and back sides of the battery core from being damaged. The temperature inconsistency between the two sides leads to errors in temperature estimation. Improved temperature reliability compared to a single chip thermistor.

It should be understood that the foregoing general description and the following detailed description are exemplary and explanatory only, and do not limit the present disclosure.

Description of the drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the disclosure and together with the description, serve to explain the principles of the disclosure.

FIG. 1 is a flow chart of a cell temperature detection circuit method according to an exemplary embodiment.

FIG. 2 is a flow chart of a cell temperature detection circuit method according to an exemplary embodiment.

FIG. 3 is a flow chart of a cell temperature detection circuit method according to an exemplary embodiment.

FIG. 4 is a flow chart of a cell temperature detection circuit method according to an exemplary embodiment.

Figure 5 is a structural diagram of a battery core temperature detection circuit according to an exemplary embodiment.

FIG. 6 is a board layout diagram of a first protection board according to an exemplary embodiment.

FIG. 7 is a board layout diagram of a second protection board according to an exemplary embodiment.

FIG. 8 is a circuit diagram illustrating cell temperature detection according to an exemplary embodiment.

FIG. 9 is a block diagram of a battery core temperature detection circuit device according to an exemplary embodiment.

FIG. 10 is a block diagram of a battery core temperature detection circuit device according to an exemplary embodiment.

Detailed ways

Exemplary embodiments will be described in detail herein, examples of which are illustrated in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings refer to the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present disclosure.

With the continuous improvement of living standards and the advancement of the times, electronic products continue to develop and be updated, and they have become a necessity in life. Most electronic products rely on batteries to power them, so battery safety is increasingly important. Electronic components and batteries are very sensitive to temperature. Excessive temperature will have a serious impact on the performance of the battery. In daily life, electronic products may become overheated or even smoke and catch fire due to excessive battery temperature. Therefore, in order to prevent the battery temperature from being too high, the temperature is detected. The thermistor is a sensor resistor whose resistance changes with changes in temperature. It has high sensitivity, a wide operating temperature range and strong stability. It is often made into a dedicated detection element. In related technologies, methods for collecting battery core temperature include: using lead-type NTC to be directly bonded to the battery core, or using a single NTC on the battery's protection plate plus the NTC on the motherboard to fit the temperature. However, in actual application scenarios, using leaded NTC to collect cell temperature will cause trouble in PCB layout and production process, and the combined angle and position will directly affect the sampling accuracy. Using a single SMD NTC will lead to large temperature estimation errors, low reliability, and increase the burden on the CPU.

Therefore, the present disclosure provides a battery core temperature detection method, which is applied to a battery temperature detection circuit. The battery temperature detection circuit includes: a first protection plate and a second protection plate, a first thermistor and a second thermistor, a main control chip. The first protection plate and the second protection plate are symmetrically arranged on the front and back of the battery core; the first thermistor is fixed on the first protection plate in the form of a patch; the second thermistor is fixed on the first protection plate in the form of a patch. Second protection board. The main control chip determines the first temperature based on the first thermistor, determines the second temperature based on the second thermistor, and determines the temperature of the battery core based on the first temperature and the second temperature. By collecting the temperature on both sides of the battery core, the temperature of the battery core can be obtained more accurately and the error can be reduced.

Figure 1 is a flow chart of a cell temperature detection method according to an exemplary embodiment. As shown in Figure 1, the cell temperature detection method is used in a battery circuit for cell temperature detection. The embodiment of the present disclosure is for The type of terminal used by the core temperature detection method is not limited. The method of cell temperature detection includes the following steps.

In step S11, the first temperature is determined based on the first thermistor, and the second temperature is determined based on the second thermistor.

In the embodiment of the present disclosure, the first thermistor is fixed away from the heating device installed on the protection board and close to the first edge of the battery core; the second thermistor is fixed away from the heating device installed on the protection board. The heating device is located close to the second edge of the battery core. The main control chip collects the temperature on one side of the battery core based on the first thermistor and determines the first temperature. The main control chip collects the temperature on the other side of the battery core based on the second thermistor and determines the second temperature.

In step S12, the temperature of the battery core is determined based on the first temperature and the second temperature.

In the embodiment of the present disclosure, the main control chip processes the first temperature and the second temperature, including: determining the average temperature between the first temperature and the second temperature, and weighting the average temperature to obtain the temperature of the battery core. .

According to embodiments of the present disclosure, when the battery is in use, the temperature of the front side and the back side of the battery cell are quite different. If the temperature of the battery core cannot be accurately obtained using only a chip thermistor, the error will be relatively large. Placing chip thermistors on both sides of the battery core can obtain the battery core temperature relatively accurately. By averaging the temperatures on both sides and weighting the average temperature, a more accurate cell temperature can be obtained. For battery circuits with different layouts, it is only necessary to change the coefficients of the weighting process.

Figure 2 is a flow chart of yet another battery core temperature detection method according to an exemplary embodiment. As shown in Figure 2, the battery core temperature detection method is used in battery circuits for battery core temperature detection. Embodiments of the present disclosure are useful for The type of terminal used in the battery core temperature detection method is not limited. The method of cell temperature detection includes the following steps.

In step S21, the first temperature is determined based on the first thermistor, the second temperature is determined based on the second thermistor, and the third temperature is determined based on the third thermistor.

In the embodiment of the present disclosure, more heating devices are installed on the first protection board than on the second protection board.

In the embodiment of the present disclosure, the first thermistor is fixed away from the heating device installed on the protection board and close to the first edge of the battery core; the second thermistor is fixed away from the heating device installed on the protection board. The heating device is positioned close to the second edge of the battery core; the position of the third thermistor is fixed at the center position corresponding to the heating device installed on the first protection plate. The main control chip collects the temperature on one side of the battery core based on the first thermistor and determines the first temperature. The main control chip collects the temperature on the other side of the battery core based on the second thermistor and determines the second temperature. The main control chip collects the temperature at the center of the heating device based on the third thermistor and determines the third temperature.

In step S22, the temperature of the battery core is determined based on the first temperature, the second temperature and the third temperature.

In the embodiment of the present disclosure, the main control chip processes the first temperature, the second temperature and the third temperature, including: determining the average temperature between the first temperature and the second temperature, and processing the average temperature and the third temperature. Weighting processing is performed to obtain the temperature of the battery core.

According to the embodiment of the present disclosure, during the use of the battery, the heating device will generate heat. As the temperature of the heating device increases, it interferes with the first thermistor and the second thermistor to collect the battery core temperature, resulting in the collected battery core temperature. The temperature has a large error compared with the actual cell temperature. The present disclosure uses a third thermistor to collect the temperature at the center of the heating device, and performs weighting processing on the collected temperature, so that the battery core temperature can be estimated more accurately. For battery circuits with different layouts, it is only necessary to change the coefficients of the weighting process.

Figure 3 is a flow chart of yet another battery core temperature detection method according to an exemplary embodiment. As shown in Figure 3, the battery core temperature detection method is used in battery circuits for battery core temperature detection. Embodiments of the present disclosure are useful for The type of terminal used in the battery core temperature detection method is not limited. The method of cell temperature detection includes the following steps.

In step S31, the first temperature is determined based on the first thermistor, the second temperature is determined based on the second thermistor, and the fourth temperature is determined based on the fourth thermistor.

In the embodiment of the present disclosure, the first thermistor is fixed away from the heating device installed on the protection board and close to the first edge of the battery core; the second thermistor is fixed away from the heating device installed on the protection board. The heating device is located close to the second edge of the battery core; the fourth thermistor is fixed on the second protection plate close to the controller. The main control chip collects the temperature on one side of the battery core based on the first thermistor and determines the first temperature. The main control chip collects the temperature on the other side of the battery core based on the second thermistor and determines the second temperature. The main control chip collects the temperature radiated by the controller based on the fourth thermistor and determines the fourth temperature.

In step S32, the temperature of the battery core is determined based on the first temperature, the second temperature and the fourth temperature.

In the embodiment of the present disclosure, the main control chip processes the first temperature, the second temperature and the fourth temperature, including: determining the average temperature between the first temperature and the second temperature, and processing the average temperature and the fourth temperature. Weighting processing is performed to obtain the temperature of the battery core.

According to embodiments of the present disclosure, during use of the electronic device, the controller may generate heat. As the temperature of the controller increases, it interferes with the battery core temperature collected by the first thermistor and the second thermistor, resulting in a large error between the collected battery core temperature and the actual battery core temperature. The present disclosure collects the temperature radiated by the controller through the fourth thermistor, and performs weighting processing on the collected temperature, so that the battery core temperature can be estimated more accurately. For battery circuits with different layouts, it is only necessary to change the coefficients of the weighting process.

Figure 4 is a flow chart of yet another battery core temperature detection method according to an exemplary embodiment. As shown in Figure 4, the battery core temperature detection method is used in battery circuits for battery core temperature detection. Embodiments of the present disclosure are useful for The type of terminal used in the battery core temperature detection method is not limited. The method of cell temperature detection includes the following steps.

In step S41, the first temperature is determined based on the first thermistor, the second temperature is determined based on the second thermistor, the third temperature is determined based on the third thermistor, and the fourth temperature is determined based on the fourth thermistor.

In the embodiment of the present disclosure, the second protection board is used to connect a controller that controls the operation of the battery core.

In the embodiment of the present disclosure, the first thermistor is fixed away from the heating device installed on the protection board and close to the first edge of the battery core; the second thermistor is fixed away from the heating device installed on the protection board. The heating device is close to the second edge of the battery core; the position of the third thermistor is fixed at the center position corresponding to the heating device installed on the first protection plate; the position of the fourth thermistor is fixed at the second protection plate on a location close to the controller. The main control chip collects the temperature on one side of the battery core based on the first thermistor and determines the first temperature. The main control chip collects the temperature on the other side of the battery core based on the second thermistor and determines the second temperature. The main control chip collects the temperature at the center of the heating device based on the third thermistor and determines the third temperature. The main control chip collects the temperature radiated by the controller based on the fourth thermistor and determines the fourth temperature.

In step S42, the temperature of the battery core is determined based on the first temperature, the second temperature, the third temperature and the fourth temperature.

In the embodiment of the present disclosure, the main control chip processes the first temperature, the second temperature, the third temperature and the fourth temperature, including: determining the average temperature between the first temperature and the second temperature, and comparing the average temperature, The third temperature and the fourth temperature are weighted to obtain the temperature of the battery core.

According to embodiments of the present disclosure, during use of the electronic device, the heating device and the controller generate heat. As the temperature of the heating device and the controller increases, it interferes with the temperature collected by the first thermistor and the second thermistor, resulting in a large error between the collected cell temperature and the actual cell temperature. The present disclosure can improve the accuracy of battery temperature measurement by collecting the temperature at the center of the heating device through the third thermistor and collecting the temperature radiated by the controller through the fourth thermistor. By determining the average temperature between the first temperature and the second temperature, and weighting the average temperature, the third temperature, and the fourth temperature, the cell temperature can be estimated more accurately. For battery circuits with different layouts, it is only necessary to change the coefficients of the weighting process.

In the embodiment of the present disclosure, the first temperature, the second temperature, the third temperature and the fourth temperature are collected through the main control chip, and the temperature of the battery core is estimated. Using the main control chip for temperature estimation can reduce the burden on the CPU.

In the embodiment of the present disclosure, the main control chip is preset with two modes: working state and sleep state. The main control chip determines the mode based on the power and/or current of the battery core. When the battery is in the process of charging or discharging, and the cell current is greater than or equal to the current threshold, the main control chip is in working mode, collecting and estimating the cell temperature at a preset high frequency. The main control chip in working mode can estimate the battery core temperature in real time and improve the accuracy of battery core temperature collection.

In the embodiment of the present disclosure, the main control chip determines the mode based on the power and/or current of the battery core. When the battery power is less than the power threshold or the battery current is less than the current threshold, it means that the battery is in a low power state, and the main control chip is in a sleep state. The main control chip in sleep mode suspends the collection and estimation of battery core temperature. The main control chip is equipped with a timer. According to the time set by the timer, the main control chip is regularly awakened to collect and estimate the battery core temperature. Through the sleep mode of the main control chip, when the battery power is low, the frequency of collecting and estimating battery core temperature is reduced, which can save battery power. Changes in battery core temperature can be detected by regularly waking up the main control chip through a timer to collect and estimate the battery core temperature.

Figure 5 is a structural diagram of a battery core temperature detection circuit according to an exemplary embodiment. As shown in Figure 5, the battery core temperature detection circuit 100 includes: a battery core 110, a first protection plate 120, and a second protection plate 130. , the first thermistor 140 and the second thermistor 150 . In this disclosure, the first protection plate 120 and the second protection plate 130 are symmetrically arranged on both sides of the battery core 110 . The first thermistor 140 is a chip-type thermistor and is fixed on the first protection plate 120 in the form of a chip. The second thermistor 150 is also a chip-type thermistor and is fixed on the first protection plate 120 in the form of a chip. The second protection board 130 is on.

In one embodiment of the present disclosure, the first thermistor 140 and the second thermistor 150 are respectively located on the protection plate close to both sides of the battery core 110, so the temperatures on both sides of the battery core can be obtained respectively. For example, during the actual use of the battery, the temperature difference between the front and back sides of the battery is relatively large. If you only rely on a single-sided thermistor to collect the temperature, it will lead to large errors and the temperature of the battery core cannot be accurately obtained. Therefore, the two thermistors in the present disclosure jointly collect the temperature on both sides of the battery core, which can improve the measurement accuracy.

In one embodiment of the present disclosure, the first thermistor 140 is fixed on the first protection plate 120, and other heating devices are installed on the first protection plate 120, such as transistors, disposable fuses, integrated circuit modules, and main control chips. , auxiliary power supply, etc. In order to reduce the interference of these heating devices, it is determined that the first thermistor 140 can more accurately collect the temperature on one side of the battery core, and the position of the first thermistor 140 is fixed away from the heating device installed on the protection board and close to the battery. The first edge position of the core.

FIG. 6 is a board layout diagram of a first protection board according to an exemplary embodiment of the present disclosure. Referring to Figure 6, the thermistor NTC1 is fixed at a position far away from other heating devices on the protection board, such as Q1, Q3, RS1, etc. The thermistor NTC1 is fixed at the lower left corner of the first protection board, that is, near the side of the battery core. edge position.

In one embodiment of the present disclosure, the second thermistor 150 is fixed on the second protection plate 130, and other heating devices are installed on the second protection plate 130, such as transistors, disposable fuses, fuel gauge module circuits, and FPC connections. Pads etc. In order to reduce the interference of these heating devices, it is determined that the second thermistor 150 can more accurately collect the temperature on the other side of the battery core, and the position of the second thermistor 150 is fixed away from the heating device installed on the protection board and close to it. The second edge position of the cell.

FIG. 7 is a board layout diagram of a second protection board according to an exemplary embodiment of the present disclosure. Referring to Figure 7, the thermistor NTC2 is fixed at a position far away from other heating devices on the protection board, such as Q2, Q4, RS2, etc. The thermistor NTC2 is fixed at the upper left corner of the second protection board, that is, close to the other side of the battery core. edge position.

In an embodiment of the present disclosure, more heating devices are installed on the first protection board than on the second protection board.

In one embodiment of the present disclosure, the battery circuit further includes a third thermistor, wherein the third thermistor is a patch thermistor, which is fixed in the form of a patch at the center corresponding to the heating device installed on the first protection board. Location. As shown in Figure 6, the fixed position of the thermistor NTC3 is the center of the heating device, which includes Q1, Q3, RS1, etc. For example, during the use of the battery, when the temperature of the heating device increases, it causes interference to the first thermistor and the second thermistor to collect the cell temperature, resulting in an error between the collected cell temperature and the actual cell temperature. big. The present disclosure uses a third thermistor to collect the temperature at the center of the heating device, and performs weighting processing on the collected temperature, so that the battery core temperature can be estimated more accurately.

In an embodiment of the present disclosure, the second protection board is used to connect a controller that controls the operation of the battery core.

In one embodiment of the present disclosure, the battery circuit further includes a fourth thermistor, wherein the fourth thermistor is a chip thermistor, which is fixed in the form of a patch on the second protection board close to the controller. As shown in Figure 7, the fixed position of the thermistor NTC4 is close to the controller, and the controller will generate heat during actual use. For example, when the temperature of the controller increases, it causes interference to the temperature collected by the first thermistor, the second thermistor and the third thermistor, resulting in a large error between the estimated cell temperature and the actual cell temperature. . This disclosure can more accurately estimate the battery core temperature by collecting the temperature radiated by the controller and weighting the collected temperature.

FIG. 8 is a circuit diagram illustrating battery core temperature detection according to an exemplary embodiment of the present disclosure. Referring to Figure 8, PCM represents the protection circuit module, R1, R2, R3, and R4 are resistors, NTC1, NTC2, NTC3, and NTC4 are thermistors, ARM-STM32 is a 32bit series microcontroller, SDA is a bidirectional data line, and SCL For the clock line, the battery circuit also includes the main control chip and auxiliary power supply. Using the main control chip for temperature estimation can reduce the burden on the CPU.

It should be noted that those skilled in the art can understand that the various implementations/embodiments mentioned above in the embodiments of the present disclosure can be used in conjunction with the foregoing embodiments or can be used independently. Whether used alone or in conjunction with the foregoing embodiments, the implementation principles are similar. In the implementation of the present disclosure, some embodiments are described in terms of implementations used together. Of course, those skilled in the art can understand that such illustrations do not limit the embodiments of the present disclosure.

Based on the same concept, embodiments of the present disclosure also provide a battery core temperature detection device.

It can be understood that, in order to implement the above functions, the battery core temperature detection device provided by the embodiment of the present disclosure includes hardware structures and/or software modules corresponding to each function. Combined with the units and algorithm steps of each example disclosed in the embodiments of the present disclosure, the embodiments of the present disclosure can be implemented in the form of hardware or a combination of hardware and computer software. Whether a function is performed by hardware or computer software driving the hardware depends on the specific application and design constraints of the technical solution. Those skilled in the art can use different methods to implement the described functions for each specific application, but such implementation should not be considered to go beyond the scope of the technical solutions of the embodiments of the present disclosure.

FIG. 9 is a block diagram 100 of a battery core temperature detection device according to an exemplary embodiment. Referring to FIG. 9 , the device includes a detection unit 101 and a processing unit 102 .

The detection unit 101 is configured to determine a first temperature based on the first thermistor and determine a second temperature based on the second thermistor.

The processing unit 102 is configured to determine the temperature of the battery core based on the first temperature and the second temperature.

In the embodiment of the present disclosure, the detection unit 101 is also used to determine the third temperature based on the third thermistor; the third thermistor is fixed in the form of a patch at the center position corresponding to the heating device installed on the first protection board. . The processing unit 102 determines the temperature of the battery core based on the first temperature and the second temperature in the following manner: determines the temperature of the battery core based on the first temperature, the second temperature, and the third temperature.

In the embodiment of the present disclosure, the detection unit 101 is also used to determine the fourth temperature based on a fourth thermistor; the fourth thermistor is fixed in the form of a patch on the second protection board close to the controller. The processing unit 102 determines the temperature of the battery core based on the first temperature and the second temperature in the following manner: determines the temperature of the battery core based on the first temperature, the second temperature, and the fourth temperature.

In the embodiment of the present disclosure, the detection unit 101 is also used to determine the third temperature based on the third thermistor; the third thermistor is fixed in the form of a patch at the center position corresponding to the heating device installed on the first protection board. ; and determining the fourth temperature based on the fourth thermistor; the fourth thermistor is fixed in the form of a patch at a position of the second protection board close to the controller. The processing unit 102 determines the temperature of the battery core based on the first temperature and the second temperature in the following manner: determines the temperature of the battery core based on the first temperature, the second temperature, the third temperature, and the fourth temperature.

In the embodiment of the present disclosure, the processing unit 102 determines the temperature of the battery core based on the first temperature, the second temperature, the third temperature and the fourth temperature in the following manner: determines the average temperature between the first temperature and the second temperature; The average temperature, the third temperature and the fourth temperature are weighted to obtain the temperature of the battery core.

In an embodiment of the present disclosure, the battery temperature detection circuit further includes: a main control chip configured to perform the step of determining the temperature of the battery core based on the first temperature and the second temperature.

In the embodiment of the present disclosure, before the main control chip performs the step of determining the temperature of the battery core based on the first temperature and the second temperature, the processing unit 102 determines that the main control chip is in a working state based on the power and/or current of the battery core. .

In the embodiment of the present disclosure, if the processing unit determines that the main control chip is in a sleep state based on the power and/or current of the battery core, the processing unit 102 periodically wakes up the main control chip and performs the determination based on the first temperature and the second temperature. Cell temperature steps.

Regarding the devices in the above embodiments, the specific manner in which each module performs operations has been described in detail in the embodiments related to the method, and will not be described in detail here.

FIG. 10 is a block diagram of a device 200 for battery core temperature detection according to an exemplary embodiment. For example, the device 200 may be a mobile phone, a computer, a digital broadcast terminal, a messaging device, a game console, a tablet device, a medical device, a fitness device, a personal digital assistant, or the like.

Referring to Figure 10, device 200 may include one or more of the following components: processing component 202, memory 204, power component 206, multimedia component 208, audio component 210, input/output (I/O) interface 212, sensor component 214, and Communication component 216.

Processing component 202 generally controls the overall operations of device 200, such as operations associated with display, phone calls, data communications, camera operations, and recording operations. The processing component 202 may include one or more processors 220 to execute instructions to complete all or part of the steps of the above method. Additionally, processing component 202 may include one or more modules that facilitate interaction between processing component 202 and other components. For example, processing component 202 may include a multimedia module to facilitate interaction between multimedia component 208 and processing component 202.

Memory 204 is configured to store various types of data to support operations at device 200 . Examples of such data include instructions for any application or method operating on device 200, contact data, phonebook data, messages, pictures, videos, etc. Memory 204 may be implemented by any type of volatile or non-volatile storage device, or a combination thereof, such as static random access memory (SRAM), electrically erasable programmable read-only memory (EEPROM), erasable programmable read-only memory (EEPROM), Programmable read-only memory (EPROM), programmable read-only memory (PROM), read-only memory (ROM), magnetic memory, flash memory, magnetic or optical disk.

Power component 206 provides power to various components of device 200 . Power components 206 may include a power management system, one or more power supplies, and other components associated with generating, managing, and distributing power to device 200 .

Multimedia component 208 includes a screen that provides an output interface between the device 200 and the user. In some embodiments, the screen may include a liquid crystal display (LCD) and a touch panel (TP). If the screen includes a touch panel, the screen may be implemented as a touch screen to receive input signals from the user. The touch panel includes one or more touch sensors to sense touches, swipes, and gestures on the touch panel. The touch sensor may not only sense the boundary of a touch or slide action, but also detect the duration and pressure associated with the touch or slide action. In some embodiments, multimedia component 208 includes a front-facing camera and/or a rear-facing camera. When the device 200 is in an operating mode, such as a shooting mode or a video mode, the front camera and/or the rear camera may receive external multimedia data. Each front-facing camera and rear-facing camera can be a fixed optical lens system or have a focal length and optical zoom capabilities.

Audio component 210 is configured to output and/or input audio signals. For example, audio component 210 includes a microphone (MIC) configured to receive external audio signals when device 200 is in operating modes, such as call mode, recording mode, and voice recognition mode. The received audio signals may be further stored in memory 204 or sent via communications component 216 . In some embodiments, audio component 210 also includes a speaker for outputting audio signals.

The I/O interface 212 provides an interface between the processing component 202 and a peripheral interface module, which may be a keyboard, a click wheel, a button, etc. These buttons may include, but are not limited to: Home button, Volume buttons, Start button, and Lock button.

Sensor component 214 includes one or more sensors for providing various aspects of status assessment for device 200 . For example, the sensor component 214 can detect the open/closed state of the device 200, the relative positioning of components, such as the display and keypad of the device 200, and the sensor component 214 can also detect a change in position of the device 200 or a component of the device 200. , the presence or absence of user contact with the device 200 , device 200 orientation or acceleration/deceleration and temperature changes of the device 200 . Sensor assembly 214 may include a proximity sensor configured to detect the presence of nearby objects without any physical contact. Sensor assembly 214 may also include a light sensor, such as a CMOS or CCD image sensor, for use in imaging applications. In some embodiments, the sensor component 214 may also include an acceleration sensor, a gyroscope sensor, a magnetic sensor, a pressure sensor, or a temperature sensor.

Communication component 216 is configured to facilitate wired or wireless communication between apparatus 200 and other devices. Device 200 may access a wireless network based on a communication standard, such as WiFi, 2G or 3G, or a combination thereof. In one exemplary embodiment, the communication component 216 receives broadcast signals or broadcast related information from an external broadcast management system via a broadcast channel. In an exemplary embodiment, the communications component 216 also includes a near field communications (NFC) module to facilitate short-range communications. For example, the NFC module can be implemented based on radio frequency identification (RFID) technology, infrared data association (IrDA) technology, ultra-wideband (UWB) technology, Bluetooth (BT) technology and other technologies.

In an exemplary embodiment, apparatus 200 may be configured by one or more application specific integrated circuits (ASICs), digital signal processors (DSPs), digital signal processing devices (DSPDs), programmable logic devices (PLDs), field programmable Gate array (FPGA), controller, microcontroller, microprocessor or other electronic components are implemented for executing the above method.

In an exemplary embodiment, a non-transitory computer-readable storage medium including instructions, such as a memory 204 including instructions, which can be executed by the processor 220 of the device 200 to complete the above method is also provided. For example, the non-transitory computer-readable storage medium may be ROM, random access memory (RAM), CD-ROM, magnetic tape, floppy disk, optical data storage device, etc.

It can be further understood that “plurality” in this disclosure refers to two or more, and other quantifiers are similar. "And/or" describes the relationship between related objects, indicating that there can be three relationships. For example, A and/or B can mean: A exists alone, A and B exist simultaneously, and B exists alone. The character "/" generally indicates that the related objects are in an "or" relationship. The singular forms "a", "the" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.

It is further understood that the terms "first", "second", etc. are used to describe various information, but such information should not be limited to these terms. These terms are only used to distinguish information of the same type from each other and do not imply a specific order or importance. In fact, expressions such as "first" and "second" can be used interchangeably. For example, without departing from the scope of the present disclosure, the first information may also be called second information, and similarly, the second information may also be called first information.

It will be further understood that although the operations are described in a specific order in the drawings in the embodiments of the present disclosure, this should not be understood as requiring that these operations be performed in the specific order shown or in a serial order, or that it is required that Perform all operations shown to obtain the desired results. In certain circumstances, multitasking and parallel processing may be advantageous.

Other embodiments of the disclosure will be readily apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This application is intended to cover any variations, uses, or adaptations of the disclosure that follow the general principles of the disclosure and include common knowledge or customary technical means in the technical field that are not disclosed in the disclosure. .

It is to be understood that the present disclosure is not limited to the precise structures described above and illustrated in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the disclosure is limited only by the appended rights.

Claims

A battery temperature detection method, characterized in that it is applied to a battery temperature detection circuit. The battery temperature detection circuit includes: a first thermistor fixed on a first protection plate in the form of a patch; The second thermistor of the second protection plate, the first protection plate and the second protection plate are respectively arranged on the front and back of the battery core; the method includes:

determining a first temperature based on the first thermistor and determining a second temperature based on the second thermistor;

Based on the first temperature and the second temperature, the temperature of the battery core is determined.
The method of claim 1, further comprising:

The third temperature is determined based on a third thermistor; the third thermistor is fixed in the form of a patch at the center position corresponding to the heating device installed on the first protection plate;

Based on the first temperature and the second temperature, determining the temperature of the battery core includes:

Based on the first temperature, the second temperature and the third temperature, the temperature of the battery core is determined.
The method of claim 1, further comprising:

The fourth temperature is determined based on a fourth thermistor; the fourth thermistor is fixed in the form of a patch on the second protection plate close to the controller;

Based on the first temperature and the second temperature, determining the temperature of the battery core includes:

Based on the first temperature, the second temperature and the fourth temperature, the temperature of the battery core is determined.
The method of claim 1, further comprising:

The third temperature is determined based on a third thermistor; the third thermistor is fixed in the form of a patch at the center position corresponding to the heating device installed on the first protection plate;

The fourth temperature is determined based on a fourth thermistor; the fourth thermistor is fixed in the form of a patch on the second protection plate close to the controller;

Based on the first temperature and the second temperature, determining the temperature of the battery core includes:

The temperature of the battery core is determined based on the first temperature, the second temperature, the third temperature and the fourth temperature.
The method of claim 4, wherein determining the temperature of the battery core based on the first temperature, the second temperature, the third temperature and the fourth temperature includes:

determining an average temperature between the first temperature and the second temperature;

The average temperature, the third temperature and the fourth temperature are weighted to obtain the temperature of the battery core.
The method according to any one of claims 1 to 5, characterized in that the battery temperature detection circuit further includes:

A main control chip configured to perform the step of determining the temperature of the battery core based on the first temperature and the second temperature.
The method of claim 6, further comprising:

Before the main control chip performs the step of determining the temperature of the battery core based on the first temperature and the second temperature, the main control chip determines the temperature of the battery core based on the power and/or current of the battery core. The chip is in working condition.
The method of claim 6, further comprising:

If it is determined that the main control chip is in a sleep state based on the power and/or current of the battery core, the main control chip is periodically woken up to perform the step of determining based on the first temperature and the second temperature. The temperature step of the battery core.
A battery temperature detection circuit, characterized by including:

The first protective plate and the second protective plate are respectively located on the front and back of the battery core;

A first thermistor, fixed on the first protection plate in the form of a patch, is used to determine the first temperature;

A second thermistor, fixed on the second protection plate in the form of a patch, is used to determine the second temperature;

A main control chip is provided on the first protection board or the second protection board, and is used to determine the temperature of the battery core based on the first temperature and the second temperature.
The battery temperature detection circuit according to claim 9, characterized in that:

The first thermistor is fixed on the first edge of the first protection plate away from the heating device installed on the protection plate and close to the battery core;

The second thermistor is fixed on the second edge of the second protection plate away from the heating device installed on the protection plate and close to the battery core.
The battery temperature detection circuit according to claim 9, characterized in that there are more heating devices installed on the first protection board than there are heating devices installed on the second protection board;

The battery circuit also includes:

The third thermistor is fixed in the form of a patch at the center position corresponding to the heating device installed on the first protection plate, and is used to determine the third temperature.
The battery temperature detection circuit according to claim 9, characterized in that the battery circuit further includes:

The fourth thermistor is fixed in the form of a patch on the second protection plate close to the controller, and is used to determine the fourth temperature.
A battery temperature detection device, characterized in that it is applied to a battery temperature detection circuit. The battery temperature detection circuit includes: a first thermistor fixed on the first protection plate in the form of a patch; The second thermistor of the second protection plate, the first protection plate and the second protection plate are respectively arranged on the front and back of the battery core, and the device includes:

a detection unit configured to determine the first temperature based on the first thermistor and determine the second temperature based on the second thermistor;

A processing unit configured to determine the temperature of the battery core based on the first temperature and the second temperature.
The device according to claim 13, characterized in that:

The detection unit is also used to determine the third temperature based on a third thermistor; the third thermistor is fixed in the form of a patch at a center position corresponding to the heating device installed on the first protection plate;

The processing unit determines the temperature of the battery core based on the first temperature and the second temperature in the following manner:

Based on the first temperature, the second temperature and the third temperature, the temperature of the battery core is determined.
The device according to claim 13, characterized in that:

The detection unit is also used to determine a fourth temperature based on a fourth thermistor; the fourth thermistor is fixed in the form of a patch on the second protection plate close to the controller;

The processing unit determines the temperature of the battery core based on the first temperature and the second temperature in the following manner:

Based on the first temperature, the second temperature and the fourth temperature, the temperature of the battery core is determined.
The device according to claim 13, characterized in that:

The detection unit is also used to determine the third temperature based on a third thermistor; the third thermistor is fixed in the form of a patch at a center position corresponding to the heating device installed on the first protection plate; and The fourth temperature is determined based on a fourth thermistor; the fourth thermistor is fixed in the form of a patch on the second protection plate close to the controller;

The processing unit determines the temperature of the battery core based on the first temperature and the second temperature in the following manner:

The temperature of the battery core is determined based on the first temperature, the second temperature, the third temperature and the fourth temperature.
The device according to claim 16, wherein the processing unit determines that the battery core is based on the first temperature, the second temperature, the third temperature and the fourth temperature in the following manner: temperature:

determining an average temperature between the first temperature and the second temperature;

The average temperature, the third temperature and the fourth temperature are weighted to obtain the temperature of the battery core.
The device according to any one of claims 13 to 17, wherein the battery temperature detection circuit further includes:

A main control chip configured to perform the step of determining the temperature of the battery core based on the first temperature and the second temperature.
The device according to claim 18, characterized in that the device further includes:

Before the main control chip performs the step of determining the temperature of the battery core based on the first temperature and the second temperature, the processing unit determines based on the power and/or current of the battery core. The main control chip is in working state.
The device according to claim 18, characterized in that the device further includes:

If the processing unit determines that the main control chip is in a sleep state based on the power and/or current of the battery core, the processing unit periodically wakes up the main control chip and executes the operation based on the first temperature. and the second temperature, the step of determining the temperature of the battery core.
A battery temperature detection device, characterized by including:

processor;

Memory used to store instructions executable by the processor;

Wherein, the processor is configured to execute the battery temperature detection method according to any one of claims 1 to 8.
A storage medium, characterized in that instructions are stored in the storage medium. When the instructions in the storage medium are executed by a processor of a terminal, the terminal can execute the method described in any one of claims 1 to 8. Battery temperature detection method.