Self-activation method and control system of lithium battery in over-discharge state

Abstract

The invention discloses a self-activation method of a lithium battery in an over-discharge state and a control system, and relates to the technical field of self-activation of the lithium battery, and the method comprises the steps: obtaining the voltage and current data of a BMS protection board before the BMS protection board stops working and the time of stopping working from a memory, and calculating the over-discharge evaluation coefficient of the lithium battery; acquiring the rated voltage, capacity and over-discharge evaluation coefficient of the battery cell to determine the initial parameter of the activation pulse control signal, activating the battery cell by using the initial parameter of the activation pulse control signal, and calculating the activation evaluation coefficient of the lithium battery; a PID algorithm is used for calculating an activation adjustment value, intelligent adjustment is carried out, a current activation adjustment coefficient is obtained, stable activation is carried out on the lithium battery according to an adjustment pulse width, an adjustment pulse interval, an adjustment pulse frequency and an adjustment activation current, and when a battery cell is recovered to a slight overdischarge protection stage, a charging and discharging control right is returned to a BMS protection board. And completing deep over-discharge activation of the lithium battery. And automatic control of the lithium battery activation process is realized.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium battery self-activation, and in particular to a self-activation method and a control system for a lithium battery in an over-discharge state. Background Art

[0002] With the development of science and technology, lithium batteries, as an efficient and lightweight energy storage device, have been widely used in electric vehicles, portable electronic devices and other fields. However, during the use of lithium batteries, over-discharge is prone to occur due to reasons such as long-term non-charging of the device, battery aging or failure of the charging management system. Over-discharge will cause an imbalance in the chemical reaction inside the battery, damage the battery structure, and thus affect the capacity and service life of the battery. At present, the solutions to the over-discharge state of lithium batteries mainly include replacing new batteries and charging with external chargers. However, these methods have the following limitations: the cost of replacing new batteries is high and it is not conducive to the recycling of resources. Charging with an external charger requires additional equipment and time, and in some cases, such as when the battery inside the device cannot be removed, this method is not feasible.

[0003] In the Chinese invention application with application publication number CN116613857A, a charging circuit, a charging control method, a chip and an electronic device are disclosed, including a power input terminal for receiving input power; a power output terminal for connecting to the positive electrode of a battery; a charging current regulating module connected to the power input terminal and the power output terminal, for activating a battery in an over-discharge state and regulating the current flowing from the power input terminal to the power output terminal to perform constant current charging on the battery; a charging current detection module connected to the charging current regulating module and the positive electrode of the battery, for detecting the charging current of the charging current regulating module.

[0004] In the above invention application, through the charging current regulating module and the charging current detecting module, it is possible to realize the activation of over-discharged batteries, detect the charging current in real time and adjust the charging current, which can avoid battery damage due to excessive current when over-discharged batteries are activated, and extend the battery life. However, only the effect of current on battery activation is considered, but battery activation is a complex process involving the interaction of multiple factors. In addition to current, pulse width, pulse interval, pulse frequency, etc. are all important factors that affect the battery activation effect. If only the effect of current is considered, other key factors may be ignored, resulting in poor activation effect or battery damage.

[0005] To this end, the present invention provides a self-activation method and control system for a lithium battery in an over-discharge state. Summary of the invention

[0006] 1. Technical issues to be resolved In view of the shortcomings of the prior art, the present invention provides a self-activation method and control system for lithium batteries in an over-discharge state. The present invention calculates the activation adjustment value by using a PID algorithm and performs intelligent adjustment to obtain the current activation adjustment coefficient. X, based on the activation adjustment factor X adjusts the initial pulse width, initial pulse interval, initial pulse frequency and initial activation current, and adjusts the pulse width according to the , adjust the pulse interval , adjust the pulse frequency and adjust the activation current The lithium battery is stably activated. When the battery cell returns to the slightly over-discharge protection stage, the charge and discharge control is returned to the BMS protection board. The deep over-discharge activation of the lithium battery is completed. By intelligently adjusting the activation parameters, it can ensure that the battery cell can maintain a stable state after activation, and realize the automatic control of the lithium battery activation process. This helps to reduce manual intervention and improve the reliability and efficiency of the activation process, thereby solving the technical problems recorded in the background technology.

[0007] (II) Technical solution To achieve the above objectives, the present invention is implemented by the following technical solution: a self-activation method of a lithium battery in an over-discharge state, characterized in that it comprises the following steps: When the lithium battery is deeply over-discharged, the BMS protection board stops working, and the 10 sets of voltage and current data before the BMS protection board stops working and the time when the BMS protection board stops working are obtained from the memory, combined with the real-time time Sj, to calculate the lithium battery over-discharge evaluation coefficient Gp; Obtain the rated voltage, capacity and over-discharge evaluation coefficient Gp of the battery cell to determine the initial parameters of the activation pulse control signal, activate the battery cell using the initial parameters of the activation pulse control signal, and calculate the lithium battery activation evaluation coefficient ; Get lithium battery activation evaluation coefficient , use the PID algorithm to calculate the activation adjustment value, and perform intelligent adjustment to obtain the current activation adjustment coefficient X, based on the activation adjustment factor X adjusts the initial pulse width, initial pulse interval, initial pulse frequency and initial activation current, and adjusts the pulse width according to the , adjust the pulse interval , adjust the pulse frequency and adjust the activation current The lithium battery is stably activated. When the battery cell returns to the slight over-discharge protection stage, the charge and discharge control is returned to the BMS protection board, and the deep over-discharge activation of the lithium battery is completed.

[0008] Furthermore, a BMS protection board is used to monitor the voltage and current of the lithium battery in real time and store them in a memory. When the lithium battery is deeply over-discharged, the BMS protection board stops working, and 10 sets of voltage and current data before the BMS protection board stops working are obtained from the memory, and the time when the BMS protection board stops working is obtained.

[0009] The BMS (Battery Management System) protection board is a circuit board that can monitor and protect lithium-ion batteries. It is an indispensable core component in lithium battery packs and is usually composed of integrated circuits, inductors, capacitors, fuses and other components. These components work together to achieve comprehensive monitoring and protection of the battery pack. The BMS protection board can monitor key parameters such as voltage, current, and temperature of the battery pack in real time. These parameters are an important basis for judging the battery status and are also the prerequisite for triggering the protection mechanism. At the same time, the BMS protection board has multiple protection mechanisms such as overcharge protection, over-discharge protection, short circuit protection, and overcurrent protection. When the battery pack has an abnormal situation, the BMS protection board will immediately take measures, such as cutting off the power supply, limiting the charge and discharge current, etc., to prevent the battery from being damaged or causing safety accidents.

[0010] Furthermore, obtain 10 sets of voltages before the BMS protection board stops working and current Data, and obtain the time when the BMS protection board stops working Tg , combined with the real-time time Sj, calculate the lithium battery over-discharge evaluation coefficient Gp:

[0011] in, i Indicates the 10 voltage groups before the BMS protection board stops working and current The sequence number of the data, i =1, 2, …, 10, and It indicates the last set of voltage and current data before the BMS protection board stops working. T indicates the monitoring period of the voltage and current of the lithium battery in real time by the BMS protection board.

[0012] Furthermore, the rated voltage, capacity and over-discharge evaluation coefficient Gp of the battery cell are obtained to determine the initial parameters of the activation pulse control signal, wherein the initial activation voltage Cy is slightly higher than the rated voltage of the battery cell, that is, the rated voltage of the battery cell + 0.5V, the initial activation current Cu is Gp*0.5 battery cell capacity, the initial pulse width Ck adopts the widest pulse width, the initial pulse interval Cj adopts the longest pulse interval, and the initial pulse frequency Cp adopts the lowest pulse frequency.

[0013] When a lithium battery is deeply over-discharged, serious chemical reaction imbalance and structural damage may occur inside the battery. Wider pulse widths and longer pulse intervals are required to allow the battery enough time to recover and repair. At the same time, the pulse frequency should be lower to avoid further damage to the battery.

[0014] Furthermore, when the user charges according to the normal charging process, the initial parameters of the activation pulse control signal are used to activate the battery cell, and the temperature sensor is used to detect the activation temperature of the lithium battery in real time. , calculate the lithium battery activation evaluation coefficient :

[0015] in, is the mean value of the activation temperature of all lithium batteries under the initial parameters of the activation pulse control signal, They are respectively the maximum activation temperature and minimum activation temperature of a standard over-discharged lithium battery activated under standard conditions.

[0016] Further, obtain the lithium battery activation evaluation coefficient , use the PID algorithm to calculate the activation adjustment value, and perform intelligent adjustment to obtain the current activation adjustment coefficient X, the formula is as follows:

[0017] in, is the proportional gain, is the integral gain, is the differential gain.

[0018] Furthermore, according to the activation adjustment coefficient X adjusts the initial pulse width, initial pulse interval, initial pulse frequency and initial activation current, specifically:

[0019] in, To adjust the pulse width, To adjust the pulse interval, To adjust the pulse frequency, To adjust the activation current.

[0020] The self-activation control system of lithium batteries in over-discharge state includes: Lithium battery over-discharge analysis module: When the lithium battery is deeply over-discharged, the BMS protection board stops working. The 10 sets of voltage and current data before the BMS protection board stops working and the time when the BMS protection board stops working are obtained from the memory, and the lithium battery over-discharge evaluation coefficient Gp is ​​calculated in combination with the real-time time Sj; Lithium battery activation analysis module, obtains the rated voltage, capacity and over-discharge evaluation coefficient Gp of the battery cell to determine the initial parameters of the activation pulse control signal, activates the battery cell using the initial parameters of the activation pulse control signal, and calculates the lithium battery activation evaluation coefficient ; Lithium battery activation adjustment module, obtain lithium battery activation evaluation coefficient , use the PID algorithm to calculate the activation adjustment value, and perform intelligent adjustment to obtain the current activation adjustment coefficient X, based on the activation adjustment factor X adjusts the initial pulse width, initial pulse interval, initial pulse frequency and initial activation current, and adjusts the pulse width according to the , adjust the pulse interval , adjust the pulse frequency and adjust the activation current The lithium battery is stably activated. When the battery cell returns to the slight over-discharge protection stage, the charge and discharge control is returned to the BMS protection board, and the deep over-discharge activation of the lithium battery is completed.

[0021] (III) Beneficial effects The present invention provides a self-activation method and control system for a lithium battery in an over-discharge state, which has the following beneficial effects: 1. When the lithium battery is deeply over-discharged, the BMS protection board stops working. The 10 sets of voltage and current data before the BMS protection board stops working and the time when the BMS protection board stops working are obtained from the memory. Combined with the real-time time Sj, the lithium battery over-discharge evaluation coefficient Gp is ​​calculated. The voltage and current changes of the battery during the over-discharge process can be accurately understood, thereby evaluating the over-discharge degree of the battery.

[0022] 2. Obtain the rated voltage, capacity and over-discharge evaluation coefficient Gp of the battery cell to determine the initial parameters of the activation pulse control signal, activate the battery cell using the initial parameters of the activation pulse control signal, and calculate the activation evaluation coefficient of the lithium battery , which helps to evaluate the tolerance of the battery cell to over-discharge, so as to better protect the battery cell during the activation process, prevent battery performance degradation or damage caused by over-discharge, ensure that the initial parameters of the activation pulse control signal are properly set, and avoid damage to the battery cell caused by excessive voltage or current.

[0023] 3. Obtain lithium battery activation evaluation coefficient , use the PID algorithm to calculate the activation adjustment value, and perform intelligent adjustment to obtain the current activation adjustment coefficient X, based on the activation adjustment factor X adjusts the initial pulse width, initial pulse interval, initial pulse frequency and initial activation current, and adjusts the pulse width according to the , adjust the pulse interval , adjust the pulse frequency and adjust the activation current The lithium battery is stably activated. When the battery cell returns to the slightly over-discharge protection stage, the charge and discharge control is returned to the BMS protection board. The deep over-discharge activation of the lithium battery is completed. By intelligently adjusting the activation parameters, it can ensure that the battery cell can maintain a stable state after activation, and realize the automatic control of the lithium battery activation process. This helps to reduce manual intervention and improve the reliability and efficiency of the activation process. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic flow chart of the self-activation method of the lithium battery in the over-discharge state of the present invention; Figure 2 It is a structural schematic diagram of the self-activation control system of the lithium battery in the over-discharge state of the present invention. DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the 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.

[0026] See also Figure 1 The present invention provides a self-activation method for a lithium battery in an over-discharge state, comprising the following steps: Step 1: When the lithium battery is deeply over-discharged, the BMS protection board stops working. The 10 sets of voltage and current data before the BMS protection board stops working and the time when the BMS protection board stops working are obtained from the memory. Combined with the real-time time Sj, the lithium battery over-discharge evaluation coefficient Gp is ​​calculated.

[0027] The step 1 includes the following contents: Step 101: Use the BMS protection board to monitor the voltage and current of the lithium battery in real time and store them in a memory. When the lithium battery is deeply over-discharged, the BMS protection board stops working. Obtain 10 sets of voltage and current data before the BMS protection board stops working from the memory, and obtain the time when the BMS protection board stops working.

[0028] The BMS (Battery Management System) protection board is a circuit board that can monitor and protect lithium-ion batteries. It is an indispensable core component in lithium battery packs and is usually composed of integrated circuits, inductors, capacitors, fuses and other components. These components work together to achieve comprehensive monitoring and protection of the battery pack. The BMS protection board can monitor key parameters such as voltage, current, and temperature of the battery pack in real time. These parameters are an important basis for judging the battery status and are also the prerequisite for triggering the protection mechanism. At the same time, the BMS protection board has multiple protection mechanisms such as overcharge protection, over-discharge protection, short circuit protection, and overcurrent protection. When the battery pack has an abnormal situation, the BMS protection board will immediately take measures, such as cutting off the power supply, limiting the charge and discharge current, etc., to prevent the battery from being damaged or causing safety accidents.

[0029] Step 102: Obtain 10 groups of voltages before the BMS protection board stops working and current Data, and obtain the time when the BMS protection board stops working Tg , combined with the real-time time Sj, calculate the lithium battery over-discharge evaluation coefficient Gp:

[0030] in, i Indicates the 10 voltage groups before the BMS protection board stops working and current The sequence number of the data, i =1, 2, …, 10, and It indicates the last set of voltage and current data before the BMS protection board stops working. T indicates the monitoring period of the voltage and current of the lithium battery in real time by the BMS protection board.

[0031] When using, combine the contents in steps 101 and 102: When the lithium battery is deeply over-discharged, the BMS protection board stops working. The 10 sets of voltage and current data before the BMS protection board stops working and the time when the BMS protection board stops working are obtained from the memory. Combined with the real-time time Sj, the lithium battery over-discharge evaluation coefficient Gp is ​​calculated. The voltage and current changes of the battery during the over-discharge process can be accurately understood, thereby evaluating the over-discharge degree of the battery.

[0032] Step 2: Obtain the rated voltage, capacity and over-discharge evaluation coefficient Gp of the battery cell to determine the initial parameters of the activation pulse control signal, activate the battery cell using the initial parameters of the activation pulse control signal, and calculate the lithium battery activation evaluation coefficient .

[0033] The step 2 includes the following contents: Step 201, obtaining the rated voltage, capacity and over-discharge evaluation coefficient Gp of the battery cell to determine the initial parameters of the activation pulse control signal, wherein the initial activation voltage Cy is slightly higher than the rated voltage of the battery cell, that is, the rated voltage of the battery cell + 0.5V, the initial activation current Cu is Gp*0.5 battery cell capacity, the initial pulse width Ck adopts the widest pulse width, the initial pulse interval Cj adopts the longest pulse interval, and the initial pulse frequency Cp adopts the lowest pulse frequency.

[0034] When a lithium battery is deeply over-discharged, serious chemical reaction imbalance and structural damage may occur inside the battery. Wider pulse widths and longer pulse intervals are required to allow the battery enough time to recover and repair. At the same time, the pulse frequency should be lower to avoid further damage to the battery.

[0035] Step 202: When the user charges according to the normal charging process, the battery cell is activated using the initial parameters of the activation pulse control signal, and the temperature sensor is used to detect the activation temperature of the lithium battery in real time. , calculate the lithium battery activation evaluation coefficient :

[0036] in, is the mean value of the activation temperature of all lithium batteries under the initial parameters of the activation pulse control signal, They are respectively the maximum activation temperature and minimum activation temperature of a standard over-discharged lithium battery activated under standard conditions.

[0037] When using, combine the contents in steps 201 and 202: Obtain the rated voltage, capacity and over-discharge evaluation coefficient Gp of the battery cell to determine the initial parameters of the activation pulse control signal, activate the battery cell using the initial parameters of the activation pulse control signal, and calculate the lithium battery activation evaluation coefficient , which helps to evaluate the tolerance of the battery cell to over-discharge, so as to better protect the battery cell during the activation process, prevent battery performance degradation or damage caused by over-discharge, ensure that the initial parameters of the activation pulse control signal are properly set, and avoid damage to the battery cell caused by excessive voltage or current.

[0038] Step 3: Obtain lithium battery activation evaluation coefficient , use the PID algorithm to calculate the activation adjustment value, and perform intelligent adjustment to obtain the current activation adjustment coefficient X, based on the activation adjustment factor X adjusts the initial pulse width, initial pulse interval, initial pulse frequency and initial activation current, and adjusts the pulse width according to the , adjust the pulse interval , adjust the pulse frequency and adjust the activation current The lithium battery is stably activated. When the battery cell returns to the slight over-discharge protection stage, the charge and discharge control is returned to the BMS protection board, and the deep over-discharge activation of the lithium battery is completed.

[0039] The step three includes the following contents: Step 301: Obtaining lithium battery activation evaluation coefficient , use the PID algorithm to calculate the activation adjustment value, and perform intelligent adjustment to obtain the current activation adjustment coefficient X, the formula is as follows:

[0040] in, is the proportional gain, is the integral gain, is the differential gain.

[0041] Step 302: Activate the adjustment coefficient X adjusts the initial pulse width, initial pulse interval, initial pulse frequency and initial activation current, specifically:

[0042] in, To adjust the pulse width, To adjust the pulse interval, To adjust the pulse frequency, To adjust the activation current.

[0043] Step 303: Adjust the pulse width according to , adjust the pulse interval , adjust the pulse frequency and adjust the activation current The lithium battery is stably activated. When the battery cell returns to the slight over-discharge protection stage, the BMS protection board works again, the system automatically shuts down, and the charge and discharge control is returned to the BMS protection board. The deep over-discharge activation of the lithium battery is completed.

[0044] When using, combine the contents in steps 301 to 303: Get lithium battery activation evaluation coefficient , use the PID algorithm to calculate the activation adjustment value, and perform intelligent adjustment to obtain the current activation adjustment coefficient X, based on the activation adjustment factor X adjusts the initial pulse width, initial pulse interval, initial pulse frequency and initial activation current, and adjusts the pulse width according to the , adjust the pulse interval , adjust the pulse frequency and adjust the activation current The lithium battery is stably activated. When the battery cell returns to the slightly over-discharge protection stage, the charge and discharge control is returned to the BMS protection board. The deep over-discharge activation of the lithium battery is completed. By intelligently adjusting the activation parameters, it can ensure that the battery cell can maintain a stable state after activation, and realize the automatic control of the lithium battery activation process. This helps to reduce manual intervention and improve the reliability and efficiency of the activation process.

[0045] See also Figure 2 The present invention provides a self-activation control system for a lithium battery in an over-discharge state, comprising: Lithium battery over-discharge analysis module: When the lithium battery is deeply over-discharged, the BMS protection board stops working. The 10 sets of voltage and current data before the BMS protection board stops working and the time when the BMS protection board stops working are obtained from the memory, and the lithium battery over-discharge evaluation coefficient Gp is ​​calculated in combination with the real-time time Sj.

[0046] Lithium battery activation analysis module, obtains the rated voltage, capacity and over-discharge evaluation coefficient Gp of the battery cell to determine the initial parameters of the activation pulse control signal, activates the battery cell using the initial parameters of the activation pulse control signal, and calculates the lithium battery activation evaluation coefficient .

[0047] Lithium battery activation adjustment module, obtain lithium battery activation evaluation coefficient , use the PID algorithm to calculate the activation adjustment value, and perform intelligent adjustment to obtain the current activation adjustment coefficient X, based on the activation adjustment factor X adjusts the initial pulse width, initial pulse interval, initial pulse frequency and initial activation current, and adjusts the pulse width according to the , adjust the pulse interval , adjust the pulse frequency and adjust the activation current The lithium battery is stably activated. When the battery cell returns to the slight over-discharge protection stage, the charge and discharge control is returned to the BMS protection board, and the deep over-discharge activation of the lithium battery is completed.

[0048] The above embodiments may be implemented in whole or in part by software, hardware, firmware or any other combination thereof. When implemented using software, the above embodiments may be implemented in whole or in part in the form of a computer program product. A person of ordinary skill in the art may appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein may be implemented in electronic hardware, or in a combination of computer software and electronic hardware. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution.

[0049] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, 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 solution of this embodiment.

[0050] The above description is only a specific implementation manner of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application.

Claims

1. A self-activation method for a lithium battery in an over-discharge state, characterized in that: The steps include: When the lithium battery is deeply over-discharged, the BMS protection board stops working, and the 10 sets of voltage and current data before the BMS protection board stops working and the time when the BMS protection board stops working are obtained from the memory, combined with the real-time time Sj, to calculate the lithium battery over-discharge evaluation coefficient Gp; Obtain the rated voltage, capacity and over-discharge evaluation coefficient Gp of the battery cell to determine the initial parameters of the activation pulse control signal, activate the battery cell using the initial parameters of the activation pulse control signal, and calculate the lithium battery activation evaluation coefficient ; Get lithium battery activation evaluation coefficient , use the PID algorithm to calculate the activation adjustment value, and perform intelligent adjustment to obtain the current activation adjustment coefficient X, based on the activation adjustment factor X adjusts the initial pulse width, initial pulse interval, initial pulse frequency and initial activation current, and adjusts the pulse width according to the , adjust the pulse interval , adjust the pulse frequency and adjust the activation current The lithium battery is stably activated. When the battery cell returns to the slight over-discharge protection stage, the charge and discharge control is returned to the BMS protection board, and the deep over-discharge activation of the lithium battery is completed.

2. The self-activation method of a lithium battery in an over-discharge state according to claim 1, characterized in that: Use the BMS protection board to monitor the voltage and current of the lithium battery in real time and store them in the memory. When the lithium battery is deeply over-discharged, the BMS protection board stops working. Get the 10 sets of voltage and current data before the BMS protection board stops working from the memory, and get the time when the BMS protection board stops working.

3. The self-activation method of a lithium battery in an over-discharge state according to claim 2, characterized in that: Get 10 sets of voltages before the BMS protection board stops working and current Data, and obtain the time when the BMS protection board stops working Tg , combined with the real-time time Sj, calculate the lithium battery over-discharge evaluation coefficient Gp: in, i Indicates the 10 voltage groups before the BMS protection board stops working and current The sequence number of the data, i =1, 2, …, 10, and It indicates the last set of voltage and current data before the BMS protection board stops working. T indicates the monitoring period of the voltage and current of the lithium battery in real time by the BMS protection board.

4. The self-activation method of a lithium battery in an over-discharge state according to claim 3, characterized in that: The rated voltage, capacity and over-discharge evaluation coefficient Gp of the battery cell are obtained to determine the initial parameters of the activation pulse control signal, wherein the initial activation voltage Cy is slightly higher than the rated voltage of the battery cell, that is, the rated voltage of the battery cell + 0.5V, the initial activation current Cu is Gp*0.5 battery cell capacity, the initial pulse width Ck adopts the widest pulse width, the initial pulse interval Cj adopts the longest pulse interval, and the initial pulse frequency Cp adopts the lowest pulse frequency.

5. The self-activation method of a lithium battery in an over-discharge state according to claim 1, characterized in that: When the user charges according to the normal charging process, the initial parameters of the activation pulse control signal are used to activate the battery cell, and the temperature sensor is used to detect the activation temperature of the lithium battery in real time. , calculate the lithium battery activation evaluation coefficient : in, is the mean value of the activation temperature of all lithium batteries under the initial parameters of the activation pulse control signal, They are respectively the maximum activation temperature and minimum activation temperature of a standard over-discharged lithium battery activated under standard conditions.

6. The self-activation method of a lithium battery in an over-discharge state according to claim 5, characterized in that: Get lithium battery activation evaluation coefficient , use the PID algorithm to calculate the activation adjustment value, and perform intelligent adjustment to obtain the current activation adjustment coefficient X, the formula is as follows: in, is the proportional gain, is the integral gain, is the differential gain.

7. The self-activation method of a lithium battery in an over-discharge state according to claim 6, characterized in that: Based on activation adjustment coefficient X adjusts the initial pulse width, initial pulse interval, initial pulse frequency and initial activation current, specifically: in, To adjust the pulse width, To adjust the pulse interval, To adjust the pulse frequency, To adjust the activation current.

8. A self-activation control system for a lithium battery in an over-discharge state, used to implement the methods described in claims 1 to 7, characterized in that: include: Lithium battery over-discharge analysis module: When the lithium battery is deeply over-discharged, the BMS protection board stops working. The 10 sets of voltage and current data before the BMS protection board stops working and the time when the BMS protection board stops working are obtained from the memory, and the lithium battery over-discharge evaluation coefficient Gp is ​​calculated in combination with the real-time time Sj; Lithium battery activation analysis module, obtains the rated voltage, capacity and over-discharge evaluation coefficient Gp of the battery cell to determine the initial parameters of the activation pulse control signal, activates the battery cell using the initial parameters of the activation pulse control signal, and calculates the lithium battery activation evaluation coefficient ; Lithium battery activation adjustment module, obtain lithium battery activation evaluation coefficient , use the PID algorithm to calculate the activation adjustment value, and perform intelligent adjustment to obtain the current activation adjustment coefficient X, based on the activation adjustment factor X adjusts the initial pulse width, initial pulse interval, initial pulse frequency and initial activation current, and adjusts the pulse width according to the , adjust the pulse interval , adjust the pulse frequency and adjust the activation current The lithium battery is stably activated. When the battery cell returns to the slight over-discharge protection stage, the charge and discharge control is returned to the BMS protection board, and the deep over-discharge activation of the lithium battery is completed.

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