BMS capacity online automatic calibration circuit, calibration method, system and storage medium

Abstract

The invention discloses a BMS capacity online automatic calibration circuit, calibration method and system and a storage medium, the circuit comprises a main control unit, a clock unit, a discharge control unit and a main loop control unit, and the discharge control unit is used for self-discharging a battery; the main loop control unit is used for performing safety protection control in the self-discharging process of the battery; the clock unit is used for calculating real-time time and transmitting the real-time time to the main control unit; the main control unit is used for detecting real-time information of the battery in the real-time time provided by the clock unit so as to judge the running state of the battery and outputting a control instruction. According to the invention, through the built-in discharge circuit of the BMS, small-window capacity discharge is carried out on the battery on the premise of ensuring the electric quantity required by the UPS standby power, so that the battery can automatically carry out capacity calibration on line, the risk of UPS standby power load failure caused by inaccurate BMS capacity report is avoided, and the relatively high cost brought by application and maintenance of the lithium battery is also greatly reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of battery management, and more specifically, to a BMS capacity online automatic calibration circuit, calibration method, system and storage medium. Background Art

[0002] With the development of new energy market and new energy technology in recent years, the application of lithium batteries has become more and more extensive. It has become an industry development trend to replace lead-acid batteries as UPS (Uninterruptible Power Supply) backup power. Among them, lithium batteries, as the backup power supply of UPS system, are in a fully charged static state most of the time. Only when the AC power is off, the lithium battery will provide backup power for the UPS system. Keeping enough power in the lithium battery is the key to ensure that the UPS system can complete the backup power.

[0003] However, since the battery system is in a fully charged idle state for a long time, the battery cells will age over time and the capacity will decay. The traditional BMS (Battery Monitoring and Management System) capacity estimation cannot be updated because the battery has not been fully discharged or fully charged for a long time, resulting in a large deviation between the capacity calculated by the BMS and the actual battery cell capacity, and the BMS capacity calculation is inaccurate. In this case, if the battery cell capacity decays severely, the battery cannot meet the backup capacity requirements of the UPS, and the BMS capacity cannot be predicted in advance due to inaccurate calculations, this will bring the risk of backup power loss to the UPS, resulting in UPS backup power failure, and bringing immeasurable losses to the data backup system.

[0004] In order to avoid inaccurate BMS capacity calculation, the traditional approach is to manually discharge and fully charge the battery regularly to correct and update the BMS capacity, which brings higher costs to the application and maintenance of lithium batteries. Summary of the invention

[0005] The purpose of the present invention is to provide a BMS capacity online automatic calibration circuit, calibration method, system and storage medium. Through the built-in discharge circuit of the BMS, the battery can be discharged in a small window capacity under the premise of ensuring the power required for the UPS backup power, so that the battery can be automatically calibrated online, avoiding the risk of UPS system backup power load drop caused by inaccurate BMS capacity reporting, and at the same time, greatly reducing the high cost of lithium battery application and maintenance.

[0006] A first aspect of the present invention provides a BMS capacity online automatic calibration circuit, comprising: Main control unit, clock unit, discharge control unit and main circuit control unit, wherein: The discharge control unit is used to self-discharge the battery; The main circuit control unit is used to perform safety protection control during the battery self-discharge process; The clock unit is used to calculate the real time and transmit the real time to the main control unit; The main control unit is used to detect the real-time information of the battery at the real-time time provided by the clock unit to determine the operating state of the battery and output a control instruction.

[0007] In this solution, the main circuit control unit includes a main circuit MOSFET control circuit. When the battery is fully charged, the main control unit controls the charging MOS tube in the main circuit MOSFET control circuit to turn off.

[0008] In this solution, the main loop MOSFET control circuit includes a charging MOS tube, a discharging MOS tube and a MOS tube driving circuit, wherein the MOS tube driving circuit is controlled by a signal from the main control unit and is used to turn on or off the charging MOS tube and the discharging MOS tube, wherein the charging MOS tube is used to control the on and off of battery charging, and the discharging MOS tube is used to control the on and off of battery discharging.

[0009] In this solution, the main control unit collects current values ​​to calculate the discharge capacity during the self-discharge process of the battery, wherein when the discharge capacity reaches a set threshold, the circuit of the discharge control unit is controlled to be shut down.

[0010] In this solution, the discharge control unit includes an electronic control switch and a load, wherein the electronic control switch includes a MOS tube, and the load includes a resistance heating sheet.

[0011] In this solution, the clock unit has a real-time clock chip circuit with RAM, which is used to transmit real-time time and date information to the main control unit through I2C communication.

[0012] In this solution, the main control unit includes a battery monitoring and management single chip computer, which is used to detect the voltage information, current information and temperature information of the battery cells in real time, and receive summary information and use the battery cell mathematical model to perform mathematical operations and logical judgments to determine the battery operating status and monitor the battery capacity.

[0013] A second aspect of the present invention further provides a method for online automatic calibration of BMS capacity, which is applied to any one of the above-mentioned online automatic calibration circuits for BMS capacity, wherein the method comprises the following steps: receiving a real time transmitted by a clock unit, and determining a time threshold parameter based on the real time, wherein the time threshold parameter includes a capacity calibration time threshold and a static time threshold; Determine the current battery state based on the current minimum threshold interval, wherein the battery state includes a charging state, a discharging state, a static state, and a fully charged state; Automatic calibration is performed based on the time threshold parameter in combination with the battery state, wherein calibration is started when the time reaches the capacity calibration time threshold, and online self-discharge calibration of the battery capacity is completed after the time reaches the rest time threshold.

[0014] The third aspect of the present invention further provides a BMS capacity online automatic calibration system, comprising a memory and a processor, wherein the memory comprises a BMS capacity online automatic calibration method program, and when the BMS capacity online automatic calibration method program is executed by the processor, the following steps are implemented: receiving a real time transmitted by a clock unit, and determining a time threshold parameter based on the real time, wherein the time threshold parameter includes a capacity calibration time threshold and a static time threshold; Determine the current battery state based on the current minimum threshold interval, wherein the battery state includes a charging state, a discharging state, a static state, and a fully charged state; Automatic calibration is performed based on the time threshold parameter in combination with the battery state, wherein calibration is started when the time reaches the capacity calibration time threshold, and online self-discharge calibration of the battery capacity is completed after the time reaches the rest time threshold.

[0015] A fourth aspect of the present invention provides a computer-readable storage medium, which includes a BMS capacity online automatic calibration method program for a machine. When the BMS capacity online automatic calibration method program is executed by a processor, the steps of a BMS capacity online automatic calibration method as described in any one of the above items are implemented.

[0016] The present invention discloses a BMS capacity online automatic calibration circuit, calibration method, system and storage medium. The built-in discharge circuit of the BMS can discharge the battery in a small window capacity on the premise of ensuring the power required for the UPS backup power, thereby allowing the battery to automatically perform capacity calibration online, thereby avoiding the risk of UPS system backup power load shedding caused by inaccurate BMS capacity reporting, and at the same time, greatly reducing the high cost caused by the application and maintenance of lithium batteries. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 A circuit diagram of a method for online automatic calibration of BMS capacity according to the present invention is shown; Figure 2A flow chart of a method for online automatic calibration of BMS capacity according to the present invention is shown; Figure 3 A block diagram of a BMS capacity online automatic calibration system of the present invention is shown.

[0018] Component number description A Main control unit B Clock unit C Discharge control unit D Main circuit control unit DETAILED DESCRIPTION

[0019] In order to more clearly understand the above-mentioned purpose, features and advantages of the present invention, the present invention is further described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be noted that the embodiments of the present application and the features in the embodiments can be combined with each other without conflict.

[0020] In the following description, many specific details are set forth to facilitate a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the protection scope of the present invention is not limited to the specific embodiments disclosed below.

[0021] Figure 1 A structural schematic diagram of a BMS capacity online automatic calibration circuit of the present application is shown.

[0022] like Figure 1 As shown, the present application discloses a BMS capacity online automatic calibration circuit, comprising: Main control unit A, clock unit B, discharge control unit C and main circuit control unit D, where: The discharge control unit C is used to self-discharge the battery; The main circuit control unit D is used to perform safety protection control during the battery self-discharge process; The clock unit B is used to calculate the real time and transmit the real time to the main control unit A; The main control unit A is used to detect the real-time information of the battery at the real-time time provided by the clock unit B to determine the battery operating status and output a control instruction.

[0023] It should be noted that, in this embodiment, Figure 1As shown, the main control unit A includes a battery monitoring management single chip microcomputer (BMS MCU), an integrated chip control route unit with a battery capacity estimation function, which is used to detect the voltage information, current information and temperature information of the battery cells in the battery in real time, and receive the summary information to perform mathematical operations and logical judgments using the battery cell mathematical model to determine the operating status of the battery and monitor the battery capacity, control the discharge control unit C and the main loop MOSFET control circuit, and read the real-time time of the clock unit B through communication to realize the battery online automatic calibration of the battery capacity, control the battery charging and discharging, and monitor the safe use of the battery.

[0024] Furthermore, the clock unit B is a high-performance, low-power, real-time clock chip circuit with RAM (it can also be other clock circuits), which can realize the calculation of time and date with high accuracy, and is used to transmit real-time time and date information to the main control unit A via I2C communication.

[0025] Furthermore, the discharge control unit C includes an electronic control switch and a load, wherein the electronic control switch includes a MOS tube (it can also be a relay or other control electronic switch), the MOS tube has the advantages of small size, low driving current power consumption, fast control startup speed, etc., the load includes a resistor heating sheet (it can also be other load elements), the resistor heating sheet has a large area, and can use the battery metal shell or heat sink to achieve a larger discharge current to improve the current accuracy, thereby improving the battery capacity calibration capacity accuracy.

[0026] Furthermore, the main loop MOSFET control circuit includes a charging MOS tube, a discharging MOS tube and a MOS tube driving circuit, wherein the MOS tube driving circuit is controlled by a signal of the main control unit A and is used to turn on or off the charging MOS tube and the discharging MOS tube, wherein the charging MOS tube is used to control the on and off of battery charging, and is a protection device for battery charging safety, and the discharging MOS tube is used to control the on and off of battery discharging, and is a protection device for battery discharging safety.

[0027] According to an embodiment of the present invention, the main circuit control unit D includes a main circuit MOSFET control circuit. When the battery is fully charged, the main control unit A controls the charging MOS tube in the main circuit MOSFET control circuit to turn off.

[0028] It should be noted that in this embodiment, the main control unit A determines the battery state by setting the minimum threshold interval of the current based on real-time information such as current, voltage, and temperature. The current is greater than the threshold for charging, and the current is less than the threshold for discharging. When the current is within the threshold interval, the battery is in a static state. The battery is fully charged based on the voltage and current, that is, the SOC is 100%. When the voltage is greater than the threshold set for full charging, and the current is less than the threshold set for full charging, the battery is in a fully charged state. After the battery is fully charged, the main control unit A will control the charging MOS tube in the main loop MOSFET control circuit to turn off. Combined with the effect of the diode in the MOS tube, although the charging MOS tube is turned off, the battery can still support the UPS system discharge. UPS is an uninterruptible power supply (Uninterruptible Power Supply), which is an uninterruptible power supply containing an energy storage device, and is mainly used to provide uninterruptible power to some equipment that has high requirements for power supply stability.

[0029] According to an embodiment of the present invention, the main control unit A collects current values ​​to calculate the discharge capacity during the self-discharge process of the battery, wherein when the discharge capacity reaches a set threshold, the circuit of the discharge control unit C is controlled to be shut down.

[0030] It should be noted that, in this embodiment, the main control unit A calculates the discharge capacity through the collected current value during the self-discharge process. When the discharge capacity reaches the set small window capacity threshold, the main control unit A controls the discharge control unit C to shut down and discharge statically, allowing the battery to enter a static state and wait for a certain period of time for the battery cell voltage to stabilize. After the battery cell voltage stabilizes, the main control unit A summarizes the stabilized voltage, temperature and other information, and performs battery capacity calibration with the internally established battery cell OCV (open circuit voltage) and battery SOC mathematical model.

[0031] Figure 2 A flow chart of a method for online automatic calibration of BMS capacity of the present application is shown.

[0032] like Figure 2 As shown, the present application discloses a method for online automatic calibration of BMS capacity, comprising the following steps: S202, receiving the real time transmitted by the clock unit, and determining a time threshold parameter based on the real time, wherein the time threshold parameter includes a capacity calibration time threshold and a static time threshold; S204, determining the current battery state based on the current minimum threshold interval, wherein the battery state includes a charging state, a discharging state, a static state, and a fully charged state; S206, performing automatic calibration based on the time threshold parameter in combination with the battery state, wherein calibration is started when the time reaches the capacity calibration time threshold, and the battery capacity online self-discharge calibration is completed after the time reaches the rest time threshold.

[0033] It should be noted that the above embodiment describes the BMS capacity online automatic calibration circuit applied by the present method, wherein the battery BMS built-in discharge circuit is used to detect the battery cell voltage, current, temperature and other information, identify the operating status of the UPS system, and calculate the battery operating time through the built-in RTC circuit. When the BMS runs to the set interval time, the BMS will control the charging tube to shut down and turn on the built-in discharge circuit for self-discharge based on the battery cell voltage, current, temperature and other information and the operating status.

[0034] In addition, the BMS will set a discharge capacity window, and the set discharge capacity window should ensure that the reserved capacity of the battery can meet the UPS system backup power. When the discharge reaches the set capacity value, the discharge is stopped and the battery is left for a period of time to wait for the battery cell voltage to stabilize. After the battery cell voltage stabilizes, the battery BMS will automatically calibrate the capacity according to the mathematical model of the battery cell voltage and capacity. Then the BMS controls the charging tube to turn on, allowing the UPS to fully charge the battery. After the battery is fully charged, the BMS will update the battery capacity and realize the calibration update of the battery capacity to improve the real-time accuracy of the battery capacity. In this way, the online automatic calibration of the battery capacity is realized, and the online automatic calibration of the battery capacity is effectively realized, avoiding the risk of UPS system backup power failure caused by insufficient power during the capacity calibration process of the BMS or inaccurate BMS battery capacity due to long-term aging of the battery cell, while reducing the high cost of lithium battery application and maintenance.

[0035] Furthermore, in this embodiment, real-time information of current, voltage, temperature, etc. is detected, and the battery state is determined by setting the minimum threshold interval of the current. When the current is greater than the threshold, it is in the charging state, and when the current is less than the threshold, it is in the discharging state. When the current is within the threshold interval, the battery is in the static state. The fully charged state of the battery is determined based on the voltage and current, that is, the SOC is "100%", the voltage is greater than the threshold set for full charging, and the current is less than the threshold set for full charging, that is, the battery is in the fully charged state. After the battery is fully charged, the charging MOS tube in the main circuit MOSFET control circuit is controlled to be turned off. Combined with the effect of the diode in the MOS tube, although the charging MOS tube is turned off, the battery can still support the discharge of the UPS system.

[0036] Furthermore, based on the real-time time transmitted by the real-time clock circuit of the clock unit, it is determined that the time interval reaches the set time interval threshold for capacity calibration, the battery is fully charged and has been standing for the set time threshold, and the operating temperature of the battery cell is within the set temperature threshold range. The main loop MOSFET control circuit is controlled to turn off the charging tube, and then the discharge control unit is turned on to start the online self-discharge calibration of the battery capacity.

[0037] Specifically, during the self-discharge process, the discharge capacity is calculated using the collected current value. When the discharge capacity reaches the set small window capacity threshold, the discharge control unit is controlled to shut down, discharge statically, and allow the battery to enter a static state, and wait for a certain period of time for the cell voltage to stabilize.

[0038] After the cell voltage is stable, the stable voltage, temperature and other information are collected and the battery capacity is calibrated with the internally established cell OCV and battery SOC mathematical model. After calibration, the main circuit MOSFET control circuit is turned off and the charging MOS tube is turned on, so that the UPS system can fully charge the battery. After the battery is fully charged, the full charge power of the battery is updated, completing the process of online self-discharge calibration of the battery capacity.

[0039] It should be noted that during the automatic calibration process, if the UPS system experiences an AC power outage, the process of online self-discharge battery capacity calibration will be terminated, and priority will be given to the battery supporting the UPS system backup power demand; or during the automatic calibration process, if the current, voltage, temperature and other battery cell data are abnormal and exceed the automatic calibration conditions, the online self-discharge battery capacity calibration process will also be terminated. After the termination, the online self-discharge battery capacity determination conditions will be re-established, and if the conditions are met, the online self-discharge battery capacity calibration process will be restarted.

[0040] Figure 3 A block diagram of a BMS capacity online automatic calibration system of the present invention is shown.

[0041] like Figure 3 As shown, the present invention discloses a BMS capacity online automatic calibration system, including a memory and a processor, wherein the memory includes a BMS capacity online automatic calibration method program, and when the BMS capacity online automatic calibration method program is executed by the processor, the following steps are implemented: receiving a real time transmitted by a clock unit, and determining a time threshold parameter based on the real time, wherein the time threshold parameter includes a capacity calibration time threshold and a static time threshold; Determine the current battery state based on the current minimum threshold interval, wherein the battery state includes a charging state, a discharging state, a static state, and a fully charged state; Automatic calibration is performed based on the time threshold parameter in combination with the battery state, wherein calibration is started when the time reaches the capacity calibration time threshold, and online self-discharge calibration of the battery capacity is completed after the time reaches the rest time threshold.

[0042] It should be noted that the above embodiment describes the BMS capacity online automatic calibration circuit applied by the present method, wherein the battery BMS built-in discharge circuit is used to detect the battery cell voltage, current, temperature and other information, identify the operating status of the UPS system, and calculate the battery operating time through the built-in RTC circuit. When the BMS runs to the set interval time, the BMS will control the charging tube to shut down and turn on the built-in discharge circuit for self-discharge based on the battery cell voltage, current, temperature and other information and the operating status.

[0043] In addition, the BMS will set a discharge capacity window, and the set discharge capacity window should ensure that the reserved capacity of the battery can meet the UPS system backup power. When the discharge reaches the set capacity value, the discharge is stopped and the battery is left for a period of time to wait for the battery cell voltage to stabilize. After the battery cell voltage stabilizes, the battery BMS will automatically calibrate the capacity according to the mathematical model of the battery cell voltage and capacity. Then the BMS controls the charging tube to turn on, allowing the UPS to fully charge the battery. After the battery is fully charged, the BMS will update the battery capacity and realize the calibration update of the battery capacity to improve the real-time accuracy of the battery capacity. In this way, the online automatic calibration of the battery capacity is realized, and the online automatic calibration of the battery capacity is effectively realized, avoiding the risk of UPS system backup power failure caused by insufficient power during the capacity calibration process of the BMS or inaccurate BMS battery capacity due to long-term aging of the battery cell, while reducing the high cost of lithium battery application and maintenance.

[0044] Furthermore, in this embodiment, real-time information of current, voltage, temperature, etc. is detected, and the battery state is determined by setting the minimum threshold interval of the current. When the current is greater than the threshold, it is in the charging state, and when the current is less than the threshold, it is in the discharging state. When the current is within the threshold interval, the battery is in the static state. The fully charged state of the battery is determined based on the voltage and current, that is, the SOC is "100%", the voltage is greater than the threshold set for full charging, and the current is less than the threshold set for full charging, that is, the battery is in the fully charged state. After the battery is fully charged, the charging MOS tube in the main circuit MOSFET control circuit is controlled to be turned off. Combined with the effect of the diode in the MOS tube, although the charging MOS tube is turned off, the battery can still support the discharge of the UPS system.

[0045] Furthermore, based on the real-time time transmitted by the real-time clock circuit of the clock unit, it is determined that the time interval reaches the set time interval threshold for capacity calibration, the battery is fully charged and has been standing for the set time threshold, and the operating temperature of the battery cell is within the set temperature threshold range. The main loop MOSFET control circuit is controlled to turn off the charging tube, and then the discharge control unit is turned on to start the online self-discharge calibration of the battery capacity.

[0046] Specifically, during the self-discharge process, the discharge capacity is calculated using the collected current value. When the discharge capacity reaches the set small window capacity threshold, the discharge control unit is controlled to shut down, discharge statically, and allow the battery to enter a static state, and wait for a certain period of time for the cell voltage to stabilize.

[0047] After the cell voltage is stable, the stable voltage, temperature and other information are collected and the battery capacity is calibrated with the internally established cell OCV and battery SOC mathematical model. After calibration, the main circuit MOSFET control circuit is turned off and the charging MOS tube is turned on, so that the UPS system can fully charge the battery. After the battery is fully charged, the full charge power of the battery is updated, completing the process of online self-discharge calibration of the battery capacity.

[0048] It should be noted that during the automatic calibration process, if the UPS system experiences an AC power outage, the process of online self-discharge battery capacity calibration will be terminated, and priority will be given to the battery supporting the UPS system backup power demand; or during the automatic calibration process, if the current, voltage, temperature and other battery cell data are abnormal and exceed the automatic calibration conditions, the online self-discharge battery capacity calibration process will also be terminated. After the termination, the online self-discharge battery capacity determination conditions will be re-established, and if the conditions are met, the online self-discharge battery capacity calibration process will be restarted.

[0049] A fourth aspect of the present invention provides a computer-readable storage medium, which includes a BMS capacity online automatic calibration method program. When the BMS capacity online automatic calibration method program is executed by a processor, the steps of a BMS capacity online automatic calibration method as described in any one of the above items are implemented, wherein the program can be installed in a battery monitoring and management microcontroller as an execution program.

[0050] The present invention discloses a BMS capacity online automatic calibration circuit, calibration method, system and storage medium. The built-in discharge circuit of the BMS can discharge the battery in a small window capacity on the premise of ensuring the power required for the UPS backup power, thereby allowing the battery to automatically perform capacity calibration online, thereby avoiding the risk of UPS system backup power load shedding caused by inaccurate BMS capacity reporting, and at the same time, greatly reducing the high cost caused by the application and maintenance of lithium batteries.

[0051] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. The device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as: multiple units or components can be combined, or can be integrated into another system, or some features can be ignored or not executed. In addition, the coupling, direct coupling, or communication connection between the components shown or discussed can be through some interfaces, and the indirect coupling or communication connection of the devices or units can be electrical, mechanical or other forms.

[0052] The units described above as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units; they may be located in one place or distributed on multiple network units; some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0053] In addition, all functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may be separately used as a unit, or two or more units may be integrated into one unit; the above-mentioned integrated units may be implemented in the form of hardware or in the form of hardware plus software functional units.

[0054] A person of ordinary skill in the art can understand that: all or part of the steps of implementing the above method embodiment can be completed by hardware related to program instructions, and the aforementioned program can be stored in a computer-readable storage medium. When the program is executed, it executes the steps of the above method embodiment; and the aforementioned storage medium includes: a mobile storage device, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk, and other media that can store program codes.

[0055] Alternatively, if the above-mentioned integrated unit of the present invention is implemented in the form of a software function module and sold or used as an independent product, it can also be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the embodiment of the present invention can be essentially or partly reflected in the form of a software product that contributes to the prior art. The computer software product is stored in a storage medium and includes several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to execute all or part of the methods described in each embodiment of the present invention. The aforementioned storage medium includes: various media that can store program codes, such as mobile storage devices, ROM, RAM, magnetic disks or optical disks.

Claims

1. A BMS capacity online automatic calibration circuit, characterized in that: include: Main control unit, clock unit, discharge control unit and main circuit control unit, wherein: The discharge control unit is used to self-discharge the battery; The main circuit control unit is used to perform safety protection control during the battery self-discharge process; The clock unit is used to calculate the real time and transmit the real time to the main control unit; The main control unit is used to detect the real-time information of the battery at the real-time time provided by the clock unit to determine the operating state of the battery and output a control instruction.

2. A BMS capacity online automatic calibration circuit according to claim 1, characterized in that: The main circuit control unit includes a main circuit MOSFET control circuit. When the battery is fully charged, the main control unit controls the charging MOS tube in the main circuit MOSFET control circuit to turn off.

3. A BMS capacity online automatic calibration circuit according to claim 2, characterized in that: The main loop MOSFET control circuit includes a charging MOS tube, a discharging MOS tube and a MOS tube driving circuit, wherein the MOS tube driving circuit is controlled by a signal from the main control unit and is used to turn on or off the charging MOS tube and the discharging MOS tube, wherein the charging MOS tube is used to control the turning on and off of battery charging, and the discharging MOS tube is used to control the turning on and off of battery discharging.

4. The BMS capacity online automatic calibration circuit according to claim 3 is characterized in that: The main control unit collects current values ​​to calculate the discharge capacity during the self-discharge process of the battery, wherein when the discharge capacity reaches a set threshold, the circuit of the discharge control unit is controlled to be shut down.

5. A BMS capacity online automatic calibration circuit according to claim 4, characterized in that: The discharge control unit includes an electronic control switch and a load, wherein the electronic control switch includes a MOS tube and the load includes a resistance heating sheet.

6. A BMS capacity online automatic calibration circuit according to claim 5, characterized in that: The clock unit has a real-time clock chip circuit with RAM, which is used to transmit real-time time and date information to the main control unit through I2C communication.

7. A BMS capacity online automatic calibration circuit according to claim 6, characterized in that: The main control unit includes a battery monitoring and management single chip computer, which is used to detect the voltage information, current information and temperature information of the battery cells in real time, and receive summary information to perform mathematical operations and logical judgments using the battery cell mathematical model to determine the battery operating status and monitor the battery capacity.

8. A method for online automatic calibration of BMS capacity, characterized in that: A BMS capacity online automatic calibration circuit applied to any one of claims 1 to 7, wherein the method comprises the following steps: receiving a real time transmitted by a clock unit, and determining a time threshold parameter based on the real time, wherein the time threshold parameter includes a capacity calibration time threshold and a static time threshold; Determine the current battery state based on the current minimum threshold interval, wherein the battery state includes a charging state, a discharging state, a static state, and a fully charged state; Automatic calibration is performed based on the time threshold parameter in combination with the battery state, wherein calibration is started when the time reaches the capacity calibration time threshold, and online self-discharge calibration of the battery capacity is completed after the time reaches the rest time threshold.

9. A BMS capacity online automatic calibration system, characterized in that: The method comprises a memory and a processor, wherein the memory comprises a BMS capacity online automatic calibration method program, and when the BMS capacity online automatic calibration method program is executed by the processor, the following steps are implemented: receiving a real time transmitted by a clock unit, and determining a time threshold parameter based on the real time, wherein the time threshold parameter includes a capacity calibration time threshold and a static time threshold; Determine the current battery state based on the current minimum threshold interval, wherein the battery state includes a charging state, a discharging state, a static state, and a fully charged state; Automatic calibration is performed based on the time threshold parameter in combination with the battery state, wherein calibration is started when the time reaches the capacity calibration time threshold, and online self-discharge calibration of the battery capacity is completed after the time reaches the rest time threshold.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium includes a BMS capacity online automatic calibration method program. When the BMS capacity online automatic calibration method program is executed by a processor, the steps of the BMS capacity online automatic calibration method according to claim 8 are implemented.

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