A battery pack power calibration system and method during vehicle power down

Abstract

The application provides a battery pack electric quantity calibration system and method during whole vehicle power-off, and belongs to the technical field of battery electric quantity calibration, and comprises a high-voltage battery pack, a battery management module, an external auxiliary power supply module, a power supply switching and wake-up control module and a clock and storage module; the signal acquisition end of the battery management module is connected with the signal output end of the high-voltage battery pack; the power supply switching and wake-up control module is provided with a first power supply input end, a second power supply input end and a power supply output end; the first power supply input end is connected with the power output end of a whole vehicle low-voltage power supply, the second power supply input end is connected with the power output end of the external auxiliary power supply module, and the power supply output end is connected with the power input end of the battery management module; and the clock and storage module is in communication connection with the battery management module. The application calibrates the high-voltage battery pack electric quantity of vehicles in the storage, waiting for shipment and transportation stages, and reduces the capacity attenuation and safety risk of battery cells.

Description

Technical Field

[0001] This invention belongs to the field of battery power calibration technology. Specifically, this invention relates to a battery pack power calibration system and method during vehicle power outage. Background Technology

[0002] In the production process of new energy vehicles (such as pure electric vehicles and plug-in hybrid electric vehicles), after the complete vehicle is assembled and rolls off the production line, it enters a storage, waiting for shipment and transportation phase that can last for several weeks or even months. During this period, in order to prevent the vehicle's low-voltage electrical systems (such as anti-theft modules, key sensors, etc.) from consuming the vehicle's 12V low-voltage battery (commonly known as the "small battery") and causing it to deplete and be damaged, the negative terminal of the small battery is usually disconnected, putting the entire vehicle into a completely power-off state.

[0003] However, this practice presents a serious problem: the vehicle's high-voltage battery pack (power battery) will naturally discharge during storage. Because the entire vehicle is powered off, the battery management system responsible for monitoring and managing the high-voltage battery pack also shuts down, making real-time SOC calculation and calibration impossible. When warehouse or transportation managers conduct periodic inspections, accurate remaining battery power information cannot be obtained from the vehicle's instruments.

[0004] Chinese Patent 105453304A provides a battery control system connected to a battery equipped with an explosion-proof mechanism that cuts off current if the battery is in an overcharged state, and controls the state of the battery. The battery control system includes: a cell voltage detection unit for detecting the cell voltage of the battery; a storage unit for storing information related to the state of the battery; an overcharge determination unit for determining whether the battery is in an overcharged state; a storage control unit for storing overcharge information related to the overcharged state of the battery in the storage unit when the overcharge determination unit determines that the battery is in an overcharged state; and an explosion-proof determination unit for determining that the explosion-proof mechanism in the battery has been activated when the battery control system is started, the overcharge information is stored in the storage unit, and the cell voltage detected by the cell voltage detection unit is less than a predetermined lower limit value.

[0005] Existing technology does not consider the need to verify the charge of high-voltage battery packs in vehicles that are in storage, awaiting shipment, or during transportation when the vehicle battery is de-energized. This could lead to over-discharge of the high-voltage battery pack, damaging the cells and causing irreversible capacity decay or safety risks. Summary of the Invention

[0006] The present invention aims to provide a battery pack power calibration system and method during vehicle power outages, in order to verify the power of the high-voltage battery pack of vehicles in the storage, waiting for shipment and transportation stages, thereby reducing cell capacity decay and safety risks.

[0007] To achieve the above objectives, the technical solution adopted by the present invention is as follows:

[0008] This invention provides a battery pack power calibration system during vehicle power outages, comprising a high-voltage battery pack, a battery management module, an external auxiliary power supply module, a power switching and wake-up control module, and a clock and storage module. The signal acquisition terminal of the battery management module is connected to the signal output terminal of the high-voltage battery pack. The power switching and wake-up control module has a first power input terminal, a second power input terminal, and a power output terminal. The first power input terminal is connected to the power output terminal of the vehicle's low-voltage power supply, the second power input terminal is connected to the power output terminal of the external auxiliary power supply module, and the power output terminal is connected to the power input terminal of the battery management module. The clock and storage module is communicatively connected to the battery management module.

[0009] The external auxiliary power module has a built-in, independently replaceable energy storage unit, which can be any one of a dry cell battery, a rechargeable lithium battery, or a supercapacitor unit.

[0010] The power switching and wake-up control module has a built-in intermittent wake-up timer, which is used to generate a wake-up pulse signal according to a preset period and output it to the battery management module.

[0011] The battery management module employs a battery management system.

[0012] It also includes a patrol wake-up interface; the patrol wake-up interface is communicatively connected to the power switching and wake-up control module.

[0013] The patrol wake-up interface uses the vehicle OBD diagnostic interface.

[0014] This invention provides a calibration method for a battery pack capacity calibration system during vehicle power outage, comprising the following steps:

[0015] Step 1: Under normal vehicle power-on conditions, the battery management module is powered by the vehicle's low-voltage power supply to estimate and calibrate the high-voltage battery pack's charge level; the power switching and wake-up control module monitors the on / off status of the vehicle's low-voltage power supply in real time.

[0016] Step 2: When the low-voltage power supply of the vehicle is detected to be disconnected, the power switching and wake-up control module switches the power input of the battery management module to the external auxiliary power module;

[0017] Step 3: After the power input switching of the battery management module is completed, it enters a low-power sleep mode. The intermittent wake-up timer built into the power switching and wake-up control module generates a wake-up signal according to a preset period and inputs it into the battery management module.

[0018] Step 4: After receiving the wake-up signal, the external auxiliary power module supplies power to the battery management module and the clock and storage module; the battery management module collects the status data of the high-voltage battery pack, combines it with the historical power data of the high-voltage battery pack stored before hibernation, corrects and calculates the power value of the high-voltage battery pack, and obtains the calibrated power value.

[0019] Step 5: Write the calibrated high-voltage battery pack's charge value, calibration timestamp, and battery status data into the clock and storage module; after data storage is complete, the power management module re-enters low-power sleep mode.

[0020] In step four, the power calibration method is as follows: the battery management module collects the open-circuit voltage and temperature data of the high-voltage battery pack, and corrects the power estimated based on the ampere-hour integration method by using the open-circuit voltage method.

[0021] In step three, the preset wake-up period of the intermittent wake-up timer is adjusted according to the battery storage environment temperature. When the ambient temperature is higher than the preset high temperature threshold, the wake-up period is shortened; when the ambient temperature is lower than the preset low temperature threshold, the wake-up period is extended.

[0022] It also includes an active wake-up method for the battery management system: when an external inspection operation triggers the inspection wake-up interface, the power switching and wake-up control module connected to the inspection wake-up interface wakes up the battery management module.

[0023] The technical effects of this invention are as follows:

[0024] (1) This invention effectively ensures the safety of power battery storage and avoids irreversible damage to the battery cells. In long-term storage scenarios where the low-voltage power supply of the whole vehicle is disconnected and the original vehicle battery management system loses power and stops, an independently set external auxiliary power supply module provides backup power to the battery management system. With the intermittent timed wake-up mechanism, the main battery management system can be woken up periodically to complete the automatic calibration of the power, so that the remaining power of the high-voltage battery pack can always be kept in a state that can be accurately monitored. The management personnel can replenish the low-power battery in a timely manner based on the accurate power data, avoid the problem of battery over-discharge caused by inaccurate power and misjudgment of power, and prevent the battery cells from experiencing irreversible capacity decay and damage to the internal chemical system.

[0025] (2) This invention significantly reduces warehousing and maintenance costs and reduces energy waste. The system is equipped with an independent inspection wake-up interface. When inspecting, managers do not need to remove the negative terminal of the low-voltage battery or power on the vehicle to quickly wake up the system and read the latest calibrated power value and battery status data. This significantly simplifies the inspection operation process and shortens the inspection time of a single vehicle. Based on accurate power data, managers can arrange recharging as needed according to the actual remaining power, replacing the traditional blind and high-frequency preventive recharging mode. This greatly reduces unnecessary recharging operations, which reduces both manual maintenance costs and energy loss during the recharging process.

[0026] (3) This invention operates with extremely low power consumption for a long time and has a small self-maintenance burden. Most of the time, it is in a low-power sleep state, with only voltage detection and timed wake-up functions in operation. The working time of a single wake-up calibration is controlled within tens of seconds, and the overall energy consumption is extremely low. With the wake-up cycle mechanism that can be dynamically adjusted according to the battery temperature, the calibration cycle is shortened in high-temperature self-discharge scenarios to ensure accuracy, and the cycle is extended in low-temperature self-discharge scenarios to further reduce energy consumption. A single small-capacity external auxiliary power supply can support long-term intermittent calibration needs. There is no need to frequently replace the external auxiliary power supply during the storage period, and the self-maintenance cost is extremely low.

[0027] (4) The architecture of the present invention has strong compatibility, flexible deployment and wide adaptability. The external auxiliary power module is independent of the original low-voltage electrical network of the vehicle. It does not require modification of the original low-voltage power distribution architecture and wiring harness design. It can be flexibly adapted to the warehousing management process of different car companies and different models. It is suitable for warehousing, shipping and long-distance transportation scenarios of various new energy vehicles such as pure electric vehicles and plug-in hybrid electric vehicles. Attached Figure Description

[0028] This manual includes the following figures, which illustrate the following:

[0029] Figure 1 This is a logical structure block diagram of a battery pack power calibration system and method for a vehicle during a power outage, according to the present invention.

[0030] Figure 2 This is a flowchart of a battery pack power calibration system and method for a vehicle during a power outage, according to the present invention.

[0031] Figure 1 The components are labeled as follows: 1. High-voltage battery pack; 2. Battery management module; 3. External auxiliary power supply module; 4. Power switching and wake-up control module; 5. Clock and storage module. Detailed Implementation

[0032] The specific embodiments of the present invention will be further described in detail below with reference to the accompanying drawings, in order to help those skilled in the art to have a more complete, accurate and in-depth understanding of the inventive concept and technical solution of the present invention, and to facilitate its implementation.

[0033] This invention provides a battery pack power calibration system during vehicle power outages, comprising a high-voltage battery pack, a battery management module, an external auxiliary power supply module, a power switching and wake-up control module, and a clock and storage module. The signal acquisition terminal of the battery management module is connected to the signal output terminal of the high-voltage battery pack. The power switching and wake-up control module is provided with a first power input terminal, a second power input terminal, and a power output terminal. The first power input terminal is connected to the power output terminal of the vehicle's low-voltage power supply, the second power input terminal is connected to the power output terminal of the external auxiliary power supply module, and the power output terminal is connected to the power input terminal of the battery management module. The clock and storage module is communicatively connected to the battery management module.

[0034] The external auxiliary power module has a built-in, independently replaceable energy storage unit, which can be any one of a dry cell battery, a rechargeable lithium battery, or a supercapacitor.

[0035] The power switching and wake-up control module has a built-in intermittent wake-up timer, which is used to generate wake-up pulse signals according to a preset period and output them to the battery management module.

[0036] The battery management module uses a battery management system.

[0037] It also includes a patrol wake-up interface; the patrol wake-up interface communicates with the power switching and wake-up control module.

[0038] The inspection wake-up interface uses the vehicle OBD diagnostic interface.

[0039] This invention provides a calibration method for a battery pack capacity calibration system during vehicle power outage, comprising the following steps:

[0040] Step 1: Under normal vehicle power-on conditions, the battery management module is powered by the vehicle's low-voltage power supply to estimate and calibrate the high-voltage battery pack's charge level; the power switching and wake-up control module monitors the on / off status of the vehicle's low-voltage power supply in real time.

[0041] Step 2: When the low-voltage power supply of the vehicle is detected to be disconnected, the power switching and wake-up control module switches the power input of the battery management module to the external auxiliary power module;

[0042] Step 3: After the power input switching of the battery management module is completed, it enters a low-power sleep mode. The intermittent wake-up timer built into the power switching and wake-up control module generates a wake-up signal according to a preset period and inputs it into the battery management module.

[0043] Step 4: After receiving the wake-up signal, the external auxiliary power module supplies power to the battery management module and the clock and storage module; the battery management module collects the status data of the high-voltage battery pack, combines it with the historical power data of the high-voltage battery pack stored before hibernation, corrects and calculates the power value of the high-voltage battery pack, and obtains the calibrated power value.

[0044] Step 5: Write the calibrated high-voltage battery pack's charge value, calibration timestamp, and battery status data into the clock and storage module; after data storage is complete, the power management module re-enters low-power sleep mode;

[0045] In step four, the power calibration method is as follows: the battery management module collects the open-circuit voltage and temperature data of the high-voltage battery pack, and corrects the power estimated based on the ampere-hour integration method by using the open-circuit voltage method.

[0046] In step three, the preset wake-up period of the intermittent wake-up timer is adjusted according to the battery storage environment temperature. When the ambient temperature is higher than the preset high temperature threshold, the wake-up period is shortened; when the ambient temperature is lower than the preset low temperature threshold, the wake-up period is extended.

[0047] It also includes an active wake-up method for the battery management system: when an external inspection operation triggers the inspection wake-up interface, the power switching and wake-up control module connected to the inspection wake-up interface wakes up the battery management module.

[0048] The present invention will now be described in detail.

[0049] This invention discloses a battery pack power calibration system during vehicle power outages, comprising a high-voltage battery pack, a battery management module, an external auxiliary power supply module, a power switching and wake-up control module, and a clock and storage module. The high-voltage battery pack, serving as the energy source for vehicle propulsion, is composed of several individual battery cells connected in series and parallel. The battery pack internally houses voltage sensors, temperature sensors, and current sensors, and the outputs of all signal acquisition components are connected to the corresponding acquisition pins of the battery management system.

[0050] The battery management module employs a battery management system (BMS). The data acquisition terminal of the battery management system is connected to the voltage sensor, temperature sensor, and current sensor in the high-voltage battery pack; it communicates bidirectionally with the clock and storage modules via the SPI bus, and can also output the high-voltage battery pack's power data to the vehicle's instrument panel or external inspection equipment via the CAN bus.

[0051] The external auxiliary power module is completely independent of the vehicle's low-voltage electrical network and is not connected to the vehicle's low-voltage power distribution circuit. Its power output is connected to the second power input port of the power switching and wake-up control module. The external auxiliary power module has a built-in small-capacity energy storage unit, which can be a regular dry cell battery, a rechargeable lithium iron phosphate battery, or a supercapacitor. In this embodiment, a 5000mAh lithium thionyl chloride battery is used.

[0052] The power switching and wake-up control module consists of a voltage detection unit, a power switching switch, a low-power intermittent wake-up timer, and a logic control unit. The module has a first power input terminal, a second power input terminal, and a power output terminal. The first power input terminal is connected to the positive terminal of the vehicle's 12V battery via the vehicle's low-voltage wiring harness. The voltage detection unit collects the voltage at this port in real time; when the voltage remains below 8V, it determines that the vehicle's low-voltage power supply has been disconnected. The voltage detection unit uses a voltage sensor. The second power input terminal is connected to the power output terminal of an external auxiliary power module. The power switching switch uses a MOSFET, and power switching is controlled by controlling the on / off state of the MOSFET. The low-power intermittent wake-up timer uses a low-power timer chip with a built-in RTC, which can output wake-up pulses according to a preset period. The timer supports dynamic period adjustment and can automatically modify the next wake-up interval based on the battery temperature collected during the previous wake-up. In this embodiment, the low-power intermittent wake-up timer uses the TPL5111 chip, and the logic control unit uses the MSP430F2252-Q1 chip.

[0053] The clock and storage module integrates a real-time clock (RTC) unit and a non-volatile memory unit, communicating bidirectionally with the main battery management system via the SPI bus. The RTC unit provides a precise time reference for year, month, day, hour, minute, and second, generating a corresponding timestamp for each wake-up calibration to record the calibration time and calculate the sleep duration. The non-volatile memory unit uses Flash memory to store key parameters such as the battery level after each calibration, calibration timestamp, battery temperature, and battery voltage.

[0054] The inspection wake-up interface adopts the automotive OBD diagnostic interface, and its signal output end is connected to the wake-up control end of the power switching and wake-up control module.

[0055] The detailed steps of the calibration method of the present invention are as follows.

[0056] When the vehicle is powered on normally, the 12V low-voltage battery is connected normally. The first power supply input port of the power switching and wake-up control module detects the 12V rated voltage and controls the power switching switch to turn on the first power supply input port and the power supply output port. The battery management system is powered by the vehicle's low-voltage power supply and performs power estimation and calibration on the high-voltage battery pack. The power switching and wake-up control module monitors the on / off status of the vehicle's low-voltage power supply in real time.

[0057] After the vehicle enters the storage or shipping stage, the operator disconnects the power input of the 12V low-voltage battery, causing the vehicle's low-voltage power grid to lose power. The voltage detection unit of the power switching and wake-up control module detects that the voltage at the first power input port has dropped below 8V, determining that the vehicle's low-voltage power supply has been disconnected. It then sends a switching command to the power switching switch: cutting off the path at the first power input port while simultaneously connecting the second power input port and the power output port, switching the power input of the battery management system to the external auxiliary power module.

[0058] After the power switch is complete, the system automatically enters a low-power sleep mode. The low-power intermittent wake-up timer begins counting down according to a preset period. In this embodiment, the wake-up period is set to 24 hours. This invention also supports dynamic adjustment of the wake-up period. In this embodiment, if the average battery temperature collected during the last wake-up is higher than 30°C, the battery self-discharge rate increases, shortening the next wake-up period to 12 hours; if the temperature is lower than 0°C, the self-discharge rate decreases, extending the wake-up period to 72 hours. When the timer countdown ends, a high-level wake-up pulse signal is generated.

[0059] A wake-up pulse signal triggers the power switching and wake-up control module to activate the main power supply circuit, and the external auxiliary power module outputs 12V power, powering on the battery management system and the clock and storage module. After powering on, the battery management system first reads the historical charge value, calibration timestamp, and battery state parameters from the clock and storage module via the SPI bus to calculate the current sleep duration. Then, it activates the acquisition channel to collect the total voltage of the high-voltage battery pack, the voltage of each individual cell, and the temperature data at each point. Since the battery pack has been inactive for a long time, the electrochemical state of the cells is stable, and the acquired terminal voltage is equivalent to the open-circuit voltage (OCV). The main battery management system calls the internally stored OCV-charge (open-circuit voltage and charge) mapping relationship at different temperatures, queries the mapping relationship at the corresponding temperature based on the current battery temperature, and obtains the charge value of the high-voltage battery pack corresponding to the current open-circuit voltage. The charge value determined by the open-circuit voltage corrects the charge value originally estimated by the battery management system using the ampere-hour integration method, eliminating self-discharge and integration accumulation errors, and obtaining the accurate charge value after this calibration.

[0060] The calibrated high-voltage battery pack's charge value, calibration timestamp, and battery status data (including battery temperature and voltage information) are written into the clock and storage module. After data storage is completed, the power management module re-enters a low-power sleep state. The intermittent wake-up timer begins the countdown for the next cycle, waiting for the next timed wake-up.

[0061] The beneficial effects of the present invention are described in detail below.

[0062] This invention effectively ensures the safety of power battery storage and avoids irreversible damage to the cells. In long-term storage scenarios where the vehicle's low-voltage power supply is disconnected and the original vehicle battery management system loses power and shuts down, an independently set external auxiliary power module provides backup power to the battery management system. Combined with an intermittent timed wake-up mechanism, it can periodically wake up the main battery management system to complete automatic power calibration, ensuring that the remaining power of the high-voltage battery pack is always accurately monitored. Managers can replenish low-power batteries in a timely manner based on accurate power data, avoiding over-discharge problems caused by inaccurate power data or misjudgment of power levels, and preventing irreversible capacity decay and damage to the internal chemical system of the cells.

[0063] This invention significantly reduces warehousing and maintenance costs and minimizes energy waste. The system features an independent inspection wake-up interface, allowing management personnel to quickly wake up the system and read the latest calibrated battery level and status data without disassembling the low-voltage battery negative terminal or powering on the vehicle during inspections. This significantly simplifies the inspection process and shortens the inspection time per vehicle. Based on accurate battery data, management personnel can schedule recharging as needed according to the actual remaining battery power, replacing the traditional blind, high-frequency preventative recharging mode. This greatly reduces unnecessary recharging operations, lowering both manual maintenance costs and energy loss during recharging.

[0064] This invention features extremely low power consumption and long-term operation with minimal maintenance burden. It operates in a low-power sleep state most of the time, retaining only voltage detection and timed wake-up functions. The working time of a single wake-up calibration is controlled within tens of seconds, resulting in extremely low overall energy consumption. In conjunction with a wake-up cycle mechanism that can dynamically adjust according to battery temperature, the calibration cycle is shortened to ensure accuracy in high-temperature, high-self-discharge scenarios, while the cycle is extended to further reduce energy consumption in low-temperature, low-self-discharge scenarios. A single small-capacity external auxiliary power supply can support long-term intermittent calibration needs, and there is no need to frequently replace the external auxiliary power supply during the storage period, resulting in extremely low self-maintenance costs.

[0065] The architecture of this invention is highly compatible, flexible in deployment, and widely adaptable. The external auxiliary power module is independent of the original low-voltage electrical network of the vehicle, requiring no modification to the original low-voltage power distribution architecture and wiring harness design. It can flexibly adapt to the warehousing management processes of different car manufacturers and different models, and is suitable for warehousing, shipping, and long-distance transportation scenarios of various new energy vehicles such as pure electric vehicles and plug-in hybrid electric vehicles.

[0066] The present invention has been described above by way of example with reference to the accompanying drawings. Obviously, the specific implementation of the present invention is not limited to the above-described manner. Any non-substantial improvements made using the inventive concept and technical solution; or the direct application of the inventive concept and technical solution to other situations without modification, are all within the protection scope of the present invention.

Claims

1. A battery pack charge calibration system during vehicle power outage, characterized in that: The system includes a high-voltage battery pack, a battery management module, an external auxiliary power supply module, a power switching and wake-up control module, and a clock and storage module. The signal acquisition terminal of the battery management module is connected to the signal output terminal of the high-voltage battery pack. The power switching and wake-up control module has a first power input terminal, a second power input terminal, and a power output terminal. The first power input terminal is connected to the power output terminal of the vehicle's low-voltage power supply, the second power input terminal is connected to the power output terminal of the external auxiliary power supply module, and the power output terminal is connected to the power input terminal of the battery management module. The clock and storage module is communicatively connected to the battery management module.

2. The battery pack charge calibration system during vehicle power failure as described in claim 1, characterized in that: The external auxiliary power module has a built-in, independently replaceable energy storage unit, which can be any one of a dry cell battery, a rechargeable lithium battery, or a supercapacitor unit.

3. The battery pack charge calibration system during vehicle power failure as described in claim 1, characterized in that: The power switching and wake-up control module has a built-in intermittent wake-up timer, which is used to generate a wake-up pulse signal according to a preset period and output it to the battery management module.

4. The battery pack charge calibration system during vehicle power failure as described in claim 1, characterized in that: The battery management module employs a battery management system.

5. The battery pack charge calibration system during vehicle power failure as described in claim 1, characterized in that: It also includes a patrol wake-up interface; the patrol wake-up interface is communicatively connected to the power switching and wake-up control module.

6. The battery pack charge calibration system during vehicle power failure as described in claim 5, characterized in that: The patrol wake-up interface uses the vehicle OBD diagnostic interface.

7. A calibration method for a battery pack capacity calibration system during vehicle power failure as described in any one of claims 1-6, characterized in that, Includes the following steps: Step 1: Under normal vehicle power-on conditions, the battery management module is powered by the vehicle's low-voltage power supply to estimate and calibrate the high-voltage battery pack's charge level; the power switching and wake-up control module monitors the on / off status of the vehicle's low-voltage power supply in real time. Step 2: When the low-voltage power supply of the vehicle is detected to be disconnected, the power switching and wake-up control module switches the power input of the battery management module to the external auxiliary power module; Step 3: After the power input switching of the battery management module is completed, it enters a low-power sleep mode. The intermittent wake-up timer built into the power switching and wake-up control module generates a wake-up signal according to a preset period and inputs it into the battery management module. Step 4: After receiving the wake-up signal, the external auxiliary power module supplies power to the battery management module and the clock and storage module; the battery management module collects the status data of the high-voltage battery pack, combines it with the historical power data of the high-voltage battery pack stored before hibernation, corrects and calculates the power value of the high-voltage battery pack, and obtains the calibrated power value. Step 5: Write the calibrated high-voltage battery pack's charge value, calibration timestamp, and battery status data into the clock and storage module; After data storage is complete, the power management module re-enters a low-power sleep state.

8. The battery pack capacity calibration method during a vehicle power outage as described in claim 7, characterized in that: In step four, the power calibration method is as follows: the battery management module collects the open-circuit voltage and temperature data of the high-voltage battery pack, and corrects the power estimated based on the ampere-hour integration method by using the open-circuit voltage method.

9. The battery pack capacity calibration method during a vehicle power outage as described in claim 7, characterized in that: In step three, the preset wake-up period of the intermittent wake-up timer is adjusted according to the battery storage environment temperature. When the ambient temperature is higher than the preset high temperature threshold, the wake-up period is shortened; when the ambient temperature is lower than the preset low temperature threshold, the wake-up period is extended.

10. A battery pack capacity calibration method during a vehicle power outage as described in claim 7, characterized in that: It also includes an active wake-up method for the battery management system: when an external inspection operation triggers the inspection wake-up interface, the power switching and wake-up control module connected to the inspection wake-up interface wakes up the battery management module.

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