Battery protection circuit

Abstract

The present application discloses a counting module for battery anomalies, characterized in that the counting module for battery anomalies receives the comparison result of the control unit on the protection duration and the preset time threshold; according to the comparison result, the counting value of the counting module for battery anomalies is accumulated or not accumulated or reset; the protection duration is obtained by the first timer controlled by the control unit. The technical solution of the present application can monitor anomalies with a longer duration, so as to protect the battery more comprehensively, protect the battery life, and improve the battery efficiency.

Description

[0001] This application is a divisional of the Chinese patent application submitted to the China Patent Office on March 25, 2022, with application number CN202210306621.7. The application name is "Battery protection circuit, chip, MCU-based battery management system and method". All the contents of this application are included in the parent case. Technical Field

[0002] The present invention relates to the technical field of battery protection circuits, and in particular to a counting module, a battery protection circuit and a battery management system. Background Art

[0003] Batteries can provide battery life for a variety of electronic products. Usually, the batteries in electronic products can be managed by a battery management system (BMS).

[0004] Some BMS chips in the prior art can implement a latch protection function. The specific process is to trigger the count after sensing an abnormal signal. When the count reaches a certain number, the latch protection function will be triggered. In the prior art, when no abnormal signal is sensed for a long time, the count will be reset to zero, so that the latch protection function will not be triggered.

[0005] Therefore, the inventors of the present application discovered during research that the latch protection function of the prior art only monitors short-term abnormal signals and counts them. It is unable to monitor situations where the number of triggers is small but the abnormality lasts for a long time. However, this type of abnormality also belongs to an abnormal working state of the battery, which will affect the battery life and working efficiency. Summary of the invention

[0006] The embodiments of the present application provide a counting module, a battery protection circuit and a battery management system. Compared with the prior art, they can monitor abnormalities with longer duration, thereby protecting the battery more comprehensively, protecting the battery life and improving the battery efficiency.

[0007] In the first aspect, the present application provides a counting module applied to battery abnormalities, characterized in that the counting module for battery abnormalities receives a comparison result of a control unit between a protection time and a preset time threshold; according to the comparison result, the counting value of the counting module for battery abnormalities is accumulated or not accumulated or cleared; the protection time is obtained by a first timer controlled by the control unit.

[0008] In combination with the first aspect, in a feasible implementation, the data acquisition unit acquires battery data and transmits it to the control unit, and the control unit controls the first timer to obtain the corresponding protection time length according to the received battery data.

[0009] In combination with the first aspect, in a feasible implementation, after a counting module applied to battery abnormality reaches a preset value, a latch protection function is triggered.

[0010] In combination with the first aspect, in a feasible implementation, a counting module applied to battery abnormality accumulates counting values ​​from zero, and when the count reaches a preset value, the control unit is triggered to perform a latch protection function.

[0011] In combination with the first aspect, in a feasible implementation, a counting module applied to battery abnormalities can set corresponding latch protection functions for different types of abnormalities, and set corresponding preset values ​​according to different types of abnormalities.

[0012] In combination with the first aspect, in a feasible implementation, a counting module applied to battery abnormalities may pre-configure the same type of abnormalities into multiple levels of monitoring, and set corresponding multiplier coefficients of the counting values ​​for different levels of monitoring.

[0013] In combination with the first aspect, in a feasible implementation method, the counting module applied to battery abnormalities is characterized in that the abnormality monitoring can be divided into three levels, the value of the abnormal increase that triggers the first level is multiplied by 0.1, the value of the abnormal increase that triggers the second level is multiplied by 0.5, and the value of the abnormal increase that triggers the third level is multiplied by 1.

[0014] In combination with the first aspect, in a feasible implementation manner, the counting module applied to the battery abnormality is a second timer.

[0015] In a second aspect, the present application provides a battery protection circuit, characterized by comprising a counting module for battery abnormality as described in any one of the first aspects.

[0016] In a third aspect, the present application provides an MCU-based battery management system, characterized in that it includes a counting module applied to battery abnormalities as described in any one of the first aspects.

[0017] The present application provides a counting module, a battery protection circuit and a battery management system, which collect battery data through a data acquisition unit, process the battery data, and when an abnormality is monitored, control the first timer to start timing, and when the abnormality disappears, control the first timer to stop timing, obtain the corresponding protection duration, compare the protection duration with a preset time threshold, and control the second timer to accumulate or clear it according to the comparison result. After the second timer reaches the preset timing, the latch protection function is triggered. Compared with the prior art, abnormalities with longer duration can be monitored, so that the battery can be protected more comprehensively, the battery life can be protected, and the battery efficiency can be improved. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying creative labor.

[0019] Figure 1a and Figure 1b is a structural schematic diagram of a battery protection circuit in an embodiment of the present application;

[0020] Figure 2 is a structural schematic diagram of a battery protection circuit provided by another embodiment of the present application;

[0021] Figure 3 is a schematic diagram of the structure of a battery management chip provided in an embodiment of the present application;

[0022] Figure 4 is a structural schematic diagram of another battery management chip provided in an embodiment of the present application;

[0023] Figure 5 It is a structural diagram of a battery management system based on MCU provided in an embodiment of the present application;

[0024] Figure 6 It is a flow chart of a battery protection method provided in an embodiment of the present application. DETAILED DESCRIPTION

[0025] In order to better understand the technical solution of the present invention, the embodiments of the present invention are described in detail below with reference to the accompanying drawings.

[0026] It should be clear that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0027] The terms used in the embodiments of the present invention are only for the purpose of describing specific embodiments, and are not intended to limit the present invention. The singular forms "a", "said" and "the" used in the embodiments of the present invention and the appended claims are also intended to include plural forms, unless the context clearly indicates other meanings.

[0028] It should be understood that the term "and / or" used in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0029] See also Figure 1a and Figure 1b In one embodiment of the present application, a battery protection circuit is provided.

[0030] like Figure 1a , the battery protection circuit comprises:

[0031] A data acquisition unit 1 for collecting battery data;

[0032] A control unit 2 for processing the battery data and controlling the first timer to start and stop timing;

[0033] A first timer 3 that performs timing under the control of the control unit 2 and obtains a corresponding protection duration;

[0034] Under the control of the control unit 2, a second timer 4 is used to perform timing or reset operations according to the comparison result between the protection duration and the preset time threshold;

[0035] And after the timing of the second timer 4 reaches the preset timing, the switch circuit 5 of the latch protection function is triggered under the control of the control unit 2.

[0036] The battery protection circuit in this embodiment collects battery data through a data acquisition unit, processes the battery data, controls the first timer to start timing when an abnormality is monitored, and controls the first timer to stop timing when the abnormality disappears, obtains a corresponding protection duration, compares the protection duration with a preset time threshold, and controls the second timer to accumulate or clear according to the comparison result. After the second timer reaches the preset timing, the latch protection function is triggered. Compared with the prior art, it can monitor abnormalities with longer duration, thereby protecting the battery more comprehensively, protecting the battery life, and improving the battery efficiency.

[0037] The following is based on Figure 1b , the above-mentioned battery protection circuit is described in more detailed embodiments of the present application.

[0038] like Figure 1b In the embodiment, the battery protection circuit includes a data acquisition unit 1, a control unit 2, a first timer 3, a second timer 4 and a switch circuit 5.

[0039] The data acquisition unit 1 acquires battery data of the battery and sends it to the control unit 2. The battery data acquired by the data acquisition unit 1 may be a voltage signal, a current signal, a temperature signal, and the like.

[0040] The data acquisition unit 1 includes an analog-to-digital conversion unit (ADC) 101, which can convert the analog signals of voltage, current or temperature in the battery data into digital signals. In the embodiment of the present application, if overvoltage monitoring is taken as an example, the data acquisition unit 1 collects the voltage signal of the battery and converts the analog voltage signal into a digital signal through the ADC 101.

[0041] The control unit 2 processes the battery data and controls the first timer 3 to start and stop timing. Specifically, when the control unit 2 detects that the battery data meets the preset abnormal condition, it controls the first timer 3 to start timing (i.e., accumulate the count value). When the control unit 2 detects that the battery data does not meet the preset abnormal condition, it controls the first timer 3 to stop timing.

[0042] Specifically, the control unit 2 includes a register 201, a digital-to-analog conversion unit (DAC) 202 and a comparator 203; the output end of the analog-to-digital conversion unit 101 is connected to the input end of the register 201; the output end of the register 201 is connected to the digital-to-analog conversion unit 202; the output end of the digital-to-analog conversion unit 202 is connected to one input end of the comparator 203, and the other input end of the comparator 203 is connected to a reference signal; the output end of the comparator 203 is connected to the first timer 3.

[0043] ADC 101 collects battery data of the battery and converts it into a digital signal. Register 201 temporarily stores the digital signal, and then converts it into an analog signal through DAC 202 and inputs it into comparator 203. Comparator 203 compares the analog signal of the battery data with the reference signal, and monitors the abnormality through the comparison result. When an abnormality is detected, a valid signal is output to the first timer 3, so that the first timer 3 starts timing. When the comparison result shows that the abnormality disappears, comparator 203 outputs an invalid signal to the first timer 3, and the first timer 3 stops timing.

[0044] In one embodiment, taking monitoring of whether the battery is over-voltage as an example, the reference signal may be a reference voltage signal. When the analog voltage signal output by the DAC 202 is higher than the reference voltage signal, it means that over-voltage is detected, and the first timer 3 starts timing. In the embodiment of the present application, other abnormalities such as over-current and over-temperature may also be monitored, which will not be described in detail here.

[0045] The control unit 2 controls the first timer 3 to start timing and controls the first timer 3 to stop timing, so as to obtain the protection duration of the abnormality. After obtaining the protection duration from the first timer 3, the control unit 2 controls the first timer 3 to reset to zero.

[0046] The control unit 2 compares the protection duration with the preset time threshold. When the protection duration is greater than the preset time threshold, it controls the second timer 4 to start timing (i.e., the accumulation of count values). When the protection duration does not exceed the preset time threshold, it means that the anomaly is an anomaly that does not meet a certain duration, and the second timer 4 does not accumulate the count value.

[0047] The second timer 4 starts to accumulate the count value from zero. When the count reaches the preset value, the control unit 2 controls to trigger the latch protection function, that is, the control unit 2 controls the switch circuit 5 to cut off the switch. The switch circuit 5 can be connected between the battery and the load, but is not limited to it. When the control unit 2 controls to trigger the latch protection function, it controls the second timer 4 to reset and clear.

[0048] See also Figure 2 In yet another embodiment of the present application, a battery protection circuit is provided.

[0049] The battery protection circuit comprises:

[0050] A data acquisition unit 1 for collecting battery data;

[0051] A control unit 2 for processing the battery data and controlling the first timer to start and stop timing;

[0052] A first timer 3 that performs timing under the control of the control unit 2 and obtains a corresponding protection duration;

[0053] Under the control of the control unit 2, a second timer 4 is used to perform timing or reset operations according to the comparison result between the protection duration and the preset time threshold;

[0054] And after the timing of the second timer 4 reaches the preset timing, the switch circuit 5 of the latch protection function is triggered under the control of the control unit 2.

[0055] The data acquisition unit 1 includes an analog-to-digital conversion unit 101, and the control unit 2 includes a register 201, a digital-to-analog conversion unit 202, and a comparator 203. The output end of the analog-to-digital conversion unit 101 is connected to the input end of the register 201; the output end of the register 201 is connected to the digital-to-analog conversion unit 202; and the output end of the digital-to-analog conversion unit 202 is connected to an input end of the comparator 203.

[0056] In the embodiment of the present application, the battery protection circuit further includes an MCU 6.

[0057] The MCU 6 is connected to the analog-to-digital conversion unit 101 and the digital-to-analog conversion unit 202. The analog-to-digital conversion unit 101 samples analog signals under the control of the MCU 6. The digital-to-analog conversion unit 202 performs digital-to-analog conversion under the control of the MCU 6.

[0058] The control unit 2 also includes a multiplexer 204, the input end of the multiplexer 204 is connected to at least two reference signals calibrated and output by the MCU 6, which are only shown as the first reference voltage and the second reference voltage in the embodiment of the present application. The MCU 6 is connected to the data selection signal end of the multiplexer 204, and can select between multiple reference signals such as the first reference voltage and the second reference voltage, and output the selected reference signal from the output end of the multiplexer 204. The output of the multiplexer 204 is connected to another input end of the comparator 203.

[0059] The battery protection circuit in the embodiment of the present application can set different threshold voltages, and the MCU activates the calibration signal and applies different reference voltages to calibrate the offset and gain errors caused by aging, process changes or other factors. For example, the offset is determined by identifying the input of the digital-to-analog converter, which produces an output closest to a known reference voltage, where the difference between the voltage nominally generated by the input value of the digital-to-analog converter and the reference voltage is the offset.

[0060] See also Figure 3 In one embodiment of the present application, a battery management chip is provided.

[0061] like Figure 3 , the battery management chip 300 comprises:

[0062] A data acquisition unit 31 for collecting battery data;

[0063] A control unit 32 that processes the battery data and controls the first timer 33 to start and stop timing;

[0064] A first timer 33 that performs timing under the control of the control unit 32 and obtains a corresponding protection duration;

[0065] A second timer 34 that performs timing or clearing operations according to a comparison result between the protection duration and a preset time threshold under the control of the control unit 32;

[0066] And after the timing of the second timer 34 reaches the preset timing, the switch circuit 35 of the protection function is triggered under the control of the control unit 32.

[0067] Among them, the data acquisition unit 31 includes an analog-to-digital conversion unit 311, and the control unit 32 includes a register 321, a digital-to-analog conversion unit 322 and a comparator 323; the output end of the analog-to-digital conversion unit 311 is connected to the input end of the register 321; the output end of the register 321 is connected to the digital-to-analog conversion unit 322; the output end of the digital-to-analog conversion unit 322 is connected to one input end of the comparator 323, and the other input end of the comparator 323 is connected to a reference signal; the output end of the comparator 323 is connected to the first timer 33.

[0068] The analog-to-digital conversion unit 311 collects battery data of the battery and converts it into a digital signal. The register 321 temporarily stores the digital signal, and then converts it into an analog signal through the digital-to-analog conversion unit 322 and inputs it into the comparator 323. The comparator 323 compares the analog signal of the battery data with the reference signal, and monitors the abnormality through the comparison result. When the abnormality is detected, a valid signal is output to the first timer 33, so that the first timer 33 starts timing; when the comparison result shows that the abnormality disappears, the comparator 323 outputs an invalid signal to the first timer 33, and the first timer 3 stops timing.

[0069] The control unit 32 controls the first timer 33 to start timing and controls the first timer 33 to stop timing, so as to obtain the protection duration of the abnormality. After obtaining the protection duration from the first timer 33, the control unit 32 controls the first timer 33 to reset.

[0070] The control unit 32 compares the protection duration with the preset time threshold. When the protection duration is greater than the preset time threshold, it controls the second timer 34 to start timing (i.e., the accumulation of the count value). When the protection duration does not exceed the preset time threshold, it means that the anomaly is an anomaly that does not meet a certain duration, and the second timer 34 does not accumulate the count value.

[0071] The second timer 34 starts to accumulate the count value from zero. When the count reaches the preset value, the control unit 32 controls to trigger the latch protection function, that is, the control unit 32 controls the switch circuit 35 to cut off the switch. The switch circuit 35 can be connected between the battery and the load, but is not limited to it. When the control unit 32 controls to trigger the latch protection function, it controls the second timer 34 to reset and clear.

[0072] The battery management chip provided in the embodiment of the present application collects battery data through a data acquisition unit, processes the battery data, controls the first timer to start timing when an abnormality is monitored, and controls the first timer to stop timing when the abnormality disappears, obtains the corresponding protection duration, compares the protection duration with a preset time threshold, and controls the second timer to accumulate or clear according to the comparison result. After the second timer reaches the preset timing, the latch protection function is triggered. Compared with the prior art, it can monitor abnormalities with longer duration, thereby protecting the battery more comprehensively, protecting the battery life, and improving the battery efficiency.

[0073] See also Figure 4 In another embodiment of the present application, a battery management chip is also provided.

[0074] and Figure 3The difference between the embodiments is that the battery management chip 400 in this embodiment further includes an MCU 46. The control unit 42 also includes a multiplexer 424.

[0075] In the embodiment of the present application, the MCU 46 is connected to the analog-to-digital conversion unit 411 and the digital-to-analog conversion unit 422. The analog-to-digital conversion unit 411 samples analog signals under the control of the MCU 46. The digital-to-analog conversion unit 422 performs digital-to-analog conversion under the control of the MCU 46.

[0076] The input end of the multiplexer 424 is connected to at least two reference signals (only the first reference voltage and the second reference voltage are shown in the embodiment of the present application) calibrated and output by the MCU 46. The MCU 46 is connected to the data selection signal end of the multiplexer 424, and can select between multiple reference signals such as the first reference voltage and the second reference voltage, and output the selected reference signal from the output end of the multiplexer 424. The output of the multiplexer 424 is connected to another input end of the comparator 423.

[0077] The battery management chip in the embodiment of the present application can set different threshold voltages, and the MCU activates the calibration signal and applies different reference voltages to calibrate the offset and gain errors caused by aging, process changes or other factors. For example, the offset is determined by identifying the input of the digital-to-analog converter, which produces an output closest to a known reference voltage, where the difference between the voltage nominally generated by the input value of the digital-to-analog converter and the reference voltage is the offset.

[0078] See also Figure 5 In an embodiment of the present application, a battery management system based on MCU is also provided.

[0079] The battery management system includes a data acquisition unit 51 , a control unit 52 , a first timer 53 , a second timer 54 , a switch circuit 55 and an MCU 56 .

[0080] A data acquisition unit 51, used for collecting battery data;

[0081] A control unit 52, used to process the battery data and control the first timer 53 to start and stop timing;

[0082] The control unit 52 is further used to obtain a corresponding protection duration, and control the second timer 54 to count or reset according to a comparison result between the protection duration and a preset time threshold;

[0083] The switch circuit 55 is used to trigger the protection function under the control of the control unit 52 after the timing of the second timer 54 reaches a preset timing.

[0084] In the embodiment of the present application, specifically, the data acquisition unit 51 includes an analog-to-digital conversion unit 511 , and the control unit 52 includes a register 521 , a digital-to-analog conversion unit 522 , a comparator 523 , and a multiplexer 524 .

[0085] MCU 56 is connected to analog-to-digital conversion unit 511 and digital-to-analog conversion unit 522 respectively; the output end of analog-to-digital conversion unit 511 is connected to the input end of register 521; the output end of register 521 is connected to digital-to-analog conversion unit 522; the output end of digital-to-analog conversion unit 522 is connected to one input end of comparator 523. The input end of multiplexer 524 is connected to at least two reference signals calibrated and output by MCU 56; MCU 56 is connected to the data selection signal end of multiplexer 524; the output end of multiplexer 524 is connected to the other input end of comparator 523.

[0086] The working principle of the battery management system in the embodiment of the present application is similar to that of the aforementioned embodiment and will not be repeated here.

[0087] See also Figure 6 In one embodiment of the present application, a battery protection method is also provided. The battery protection method in this embodiment can be applied to the battery protection circuit, battery management chip or battery management system in the above embodiments.

[0088] The battery protection method in the embodiment of the present application includes:

[0089] S61, collecting battery data;

[0090] Specifically, the collected battery data may be a voltage signal, a current signal, a temperature signal, etc. For example, the analog signal of voltage, current or temperature in the battery data may be converted into a digital signal by an analog-to-digital conversion unit for collection.

[0091] S62, processing the battery data, controlling the first timer to start and stop timing, and obtaining a corresponding protection duration;

[0092] Specifically, when the monitored battery data meets the preset abnormal condition, the first timer is controlled to count (ie, the count value is accumulated); when the monitored battery data does not meet the preset abnormal condition, the first timer is controlled to stop counting.

[0093] For example, the battery data is compared with a reference signal, and when the preset comparison result is met, the first timer is controlled to start timing, and when the preset comparison result is not met, the first timer is controlled to stop timing; the reference signal is determined by a pre-configured configuration, or is selected by a multiplexer from a pre-configured multi-channel reference signal.

[0094] The protection duration is the time period between the start and stop timing.

[0095] S63, controlling the second timer to perform timing or reset operation according to the comparison result between the protection time length and the preset time threshold;

[0096] Specifically, the preset time threshold is configured by the user's pre-configuration instructions. For example, the preset time threshold can be preset according to different abnormal situations. For example, there are sixteen time thresholds that can be configured by the user. If the overvoltage protection is easily triggered, the time threshold can be increased, such as adjusting it to a cumulative value of 60 minutes before it can be triggered. If you want it to be more sensitive, then lower the threshold and adjust it to trigger the protection when the cumulative time reaches 5 minutes.

[0097] S64, after the timing of the second timer reaches a preset timing, triggering a latch protection function.

[0098] Specifically, in one embodiment of the present application, corresponding latch protection functions may be set for different types of abnormalities, and the preset timing that the corresponding second timer needs to accumulate may be set accordingly according to the different types of abnormalities.

[0099] For example, for multiple types of abnormalities (overvoltage, discharge overcurrent, short circuit), each type can correspond to a single abnormality detection: four gears can be set for selection, including 0.1, 0.3, 0.7, and 1 (i.e., the preset timing multiplier coefficient). The four gears allow users to configure. For example, in places with relatively high temperatures, the severity of the danger corresponding to low-temperature protection is relatively small, so the low-temperature protection trigger can be set to 0.1, and then the high-temperature protection is set to 1. The remaining various abnormalities can have similar configurations. If abnormalities continue to occur within a period of time, they will continue to accumulate until the protection function is triggered. If no abnormality is triggered within a period of time, the current accumulated value will be cleared to zero.

[0100] In another embodiment of the present application, the same type of anomalies may be pre-configured into multiple levels of monitoring levels; and corresponding multiplier coefficients for increasing the timing value may be set for different levels of monitoring levels.

[0101] For example, a certain type of abnormal monitoring can be divided into three levels, among which the first and second levels are mainly for monitoring and early warning, so the increased timing value can be multiplied by a coefficient, such as the value increased by triggering the first level abnormality is multiplied by 0.1 (that is, in the first level, the multiplication coefficient of the increased timing value is 0.1), the value increased by triggering the second level abnormality is multiplied by 0.5 (that is, in the second level, the multiplication coefficient of the increased timing value is 0.5), and the value increased by the third level will be multiplied by 1.

[0102] The battery protection method provided in the above embodiment collects battery data through a data acquisition unit, processes the battery data, controls the first timer to start timing when an abnormality is monitored, and controls the first timer to stop timing when the abnormality disappears, obtains the corresponding protection duration, compares the protection duration with a preset time threshold, and controls the second timer to accumulate or clear according to the comparison result. After the second timer reaches the preset timing, the latch protection function is triggered. Compared with the prior art, it can monitor abnormalities with longer duration, thereby protecting the battery more comprehensively, protecting the battery life, and improving the battery efficiency.

[0103] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A battery protection circuit, It is characterized in that It includes a data acquisition unit, a control unit, an MCU, a first timer, and a counting module applied to battery abnormalities, wherein the counting module applied to battery abnormalities is a second timer; The data acquisition unit collects battery data and transmits it to the control unit; The control unit processes the battery data, and when an abnormality is monitored, controls the first timer to start timing, and when the abnormality disappears, controls the first timer to stop timing, and obtains the protection duration of the abnormality; the control unit compares the protection duration with the preset time threshold, and controls the count value of the second timer to be accumulated or not accumulated or reset to zero according to the comparison result; When the count value reaches a preset value, a control unit connected to the counting module is triggered to control the trigger latch protection function, thereby cutting off a switch circuit connected between the battery and the load; The control unit controls the second timer to reset and clear when controlling the triggering latch protection function; The control unit further includes a multiplexer, an input end of the multiplexer is connected to at least two reference signals calibrated and output by the MCU, the MCU is connected to a data selection signal end of the multiplexer, selects the multiple reference signals, and outputs the selected reference signal from the output end of the multiplexer as an input threshold voltage of a comparator of the control unit, and compares the battery data to monitor abnormalities; The battery abnormality counting module is used to monitor battery abnormalities with long duration and few trigger times; the battery abnormality counting module can set corresponding latch protection functions according to different types of abnormalities, and set multiplier coefficients of count values ​​corresponding to different types of abnormalities according to the environment; The battery abnormality counting module can also pre-configure the same type of abnormality into multiple levels of monitoring, and set corresponding counting value multiplier coefficients for different levels of monitoring; The protection duration is obtained by timing the first timer under the control of the control unit.

2. The battery protection circuit according to claim 1, It is characterized in that The counting module applied to battery abnormality accumulates the count value from zero, and when the count reaches the preset value, the control unit is triggered to perform the latch protection function.

3. The battery protection circuit according to claim 1, It is characterized in that The counting module applied to battery abnormalities is characterized in that the abnormality monitoring is divided into three levels. The value of the abnormal increase that triggers the first level is multiplied by 0.1, the value of the abnormal increase that triggers the second level is multiplied by 0.5, and the value of the abnormal increase that triggers the third level is multiplied by 1.

Images