Battery control circuit capable of flexibly controlling charging and discharging channels, control method and storage medium

Abstract

The invention discloses a battery control circuit capable of flexibly controlling a charging and discharging channel, a control method and a storage medium, and the circuit comprises a positive electrode circuit which is sequentially connected with a battery positive electrode, a first relay, a fuse and a battery charging and discharging port positive electrode in series; the first relay and the discharge freewheel diode are reversely connected in parallel; the negative electrode circuit is sequentially connected in series with a battery negative electrode, a second relay, a shunt and a battery charge-discharge port negative electrode; the second relay and the charging freewheel diode are reversely connected in parallel; the battery management system is respectively connected to the battery, the first relay, the second relay and the diverter; when the battery is charged in an overvoltage state, the first relay is controlled to be switched off to cut off the charging circuit, and when the discharging current is detected, the first relay is controlled to be switched on; when the battery is under-voltage during discharging, the second relay is controlled to be switched off and cut off the discharging circuit, and when the charging current is detected, the second relay is controlled to be switched on. According to the invention, intelligent and effective charging and discharging of the battery in the operation process can be ensured.

Description

Technical Field

[0001] The present application relates to the technical field of battery charging and discharging, and in particular to a battery system control circuit, a control method and a storage medium with flexible control of charging and discharging channels. Background Art

[0002] With the rapid development of new energy technologies, battery systems have been widely used in electric vehicles, portable electronic devices and other fields due to their advantages such as high energy density and long cycle life. In the existing battery system charge and discharge control, relays or MOS tubes are often used for control, but both methods have serious drawbacks.

[0003] The charge and discharge channels are controlled by relays. When the battery system is disconnected due to charge overvoltage protection or discharge undervoltage protection, the charge and discharge channels will be cut off at the same time, causing the battery system to be unable to perform necessary reverse operations in the protection state. During charge overvoltage protection, even if the battery still has sufficient power, it cannot supply power to the outside, affecting the normal operation of the system. During discharge undervoltage protection, the battery cannot be recharged in time and is in a state of power loss for a long time, which may cause irreversible capacity decay or even permanent damage to the battery. In addition, the relay is prone to arcing during frequent switching, causing contact oxidation. After long-term use, adhesion or poor contact may occur, further reducing system reliability.

[0004] By controlling the charging and discharging channels separately through two independent MOS tubes, independent management of charging and discharging can be achieved in theory. However, the current carrying capacity of MOS tubes is much lower than that of relays. In high-current scenarios, multiple tubes need to be used in parallel, which not only increases the hardware cost, but also introduces the problem of current sharing. Secondly, the switching consistency of MOS tubes is poor. Even if the battery management system sends control signals synchronously, the switching timing of parallel MOS tubes is still difficult to be completely consistent. Some MOS tubes may be subjected to excessive current due to delayed conduction or early shutdown, resulting in local overheating or even breakdown, seriously affecting system stability. Under high-current conditions, the conduction loss of MOS tubes is significant, and it is easy to cause thermal failure due to excessive temperature, exacerbating the risk of device aging.

[0005] In summary, although relay control can withstand large currents, it cannot achieve independent control of the charge and discharge channels, resulting in limited system functions after protection action; although MOS tube control can separate the charge and discharge channels, it is limited by device characteristics and it is difficult to balance large current carrying and switch reliability, and the cost is relatively high. At present, there is an urgent need for a technical solution that can meet large current requirements and achieve flexible control of charge and discharge channels to improve the safety and applicability of battery systems. Summary of the invention

[0006] In view of the above problems, the purpose of the present application is to provide a battery system control circuit, control method, and storage medium with flexible control of charging and discharging channels, which can ensure that the battery system intelligently and effectively performs charging and discharging throughout the operation process. At the same time, it can achieve large-current charging and discharging freely.

[0007] According to one aspect of the present application, there is provided a battery control circuit with flexible control of charging and discharging channels, including:

[0008] Positive electrode circuit: The battery positive electrode, the first relay, the fuse, and the positive electrode of the battery charging and discharging port are connected in series in sequence; the first relay and a discharge freewheeling diode are reversely connected in parallel; Negative electrode circuit: The battery negative electrode, the second relay, the shunt, and the negative electrode of the battery charging and discharging port are connected in series in sequence; the second relay and a charging freewheeling diode are reversely connected in parallel; It further includes a battery management system, whose first end is connected to the battery for collecting the cell voltage, whose second end is connected to the first relay, whose third end is connected to the second relay, and whose fourth end is connected to the shunt.

[0009] The battery management system is set to: control the first relay and the second relay to close, conducting the positive electrode circuit and the negative electrode circuit; when detecting that the battery is overcharged, control the first relay to disconnect, and the discharge freewheeling diode is reversely cut off, cutting off the charging circuit. When detecting the discharge current, control the first relay to close, and the discharge current passes through the first relay channel; when detecting that the battery is under-discharged, control the second relay to disconnect, and the charging freewheeling diode is reversely cut off, cutting off the discharge circuit. When detecting the charging current, control the second relay to close, and the charging current passes through the second relay channel.

[0010] Preferably, in some embodiments of the present application, the battery management system is set to: confirm the normal operation of the battery management system in the power-on startup self-check mode.

[0011] Preferably, in some embodiments of the present application, the fifth end of the battery management system is connected to the battery for collecting the cell temperature, and the overvoltage and / or undervoltage thresholds of the battery are adjusted in real time based on the cell temperature.

[0012] Preferably, in some embodiments of the present application, the discharge freewheeling diode is a series combination of a fast-recovery diode and a surge protection diode, and the cathode of the fast-recovery diode is connected to the battery positive electrode, and the charging freewheeling diode is a Schottky diode.

[0013] Preferably, in some embodiments of the present application, the battery management system is set to: when detecting that the battery is overcharged, control the first relay to disconnect and re-close after detecting that the discharge current ≥ 1A and lasts for 10ms;

[0014] When detecting that the battery is under-discharged, control the second relay to disconnect and re-close when detecting that the charging current ≥ 1A.

[0015] According to another aspect of the present application, the present application further provides a battery control method with flexible control of charge and discharge channels, including the control circuit of any one of the above embodiments. The control method includes: controlling the first relay and the second relay to close to conduct the positive electrode circuit and the negative electrode circuit; when it is detected that the battery is overcharged, controlling the first relay to open, the discharge freewheeling diode to be reversely cut off, and cutting off the charging circuit. When a discharge current is detected, controlling the first relay to close, and the discharge current passes through the first relay channel; when it is detected that the battery is underdischarged, controlling the second relay to open, the charging freewheeling diode to be reversely cut off, and cutting off the discharge circuit. When a charging current is detected, controlling the second relay to close, and the charging current passes through the second relay channel.

[0016] Preferably, in some embodiments of the present application, it further includes: the battery management system starts up and performs a self-check mode to confirm that the battery management system is normal.

[0017] Preferably, in some embodiments of the present application, it further includes: the battery management system adjusts the overvoltage and / or undervoltage thresholds of the battery in real time based on the cell temperature.

[0018] Preferably, in some embodiments of the present application, it further includes: when it is detected that the battery is overcharged, controlling the first relay to open and re-closing after detecting a discharge current ≥ 1A and lasting for 10 ms; when it is detected that the battery is underdischarged, controlling the second relay to open and re-closing when detecting a charging current ≥ 1A.

[0019] According to another aspect of the present application, the present application further provides a computer-readable storage medium, on which computer instructions are stored. When the computer instructions are executed by a processor, the control method of any one of the above embodiments can be implemented.

[0020] It should be understood that within the scope of the present application, the above technical features of the present application and the technical features specifically described below (such as in the embodiments) can be combined with each other to form new or preferred technical solutions. Due to space limitations, they will not be elaborated one by one here.

[0021] Compared with the prior art, the present application has the following technical effects:

[0022] The present application can flexibly control the charge and discharge channels, ensuring that the battery system intelligently and effectively performs charge and discharge throughout the operation process. At the same time, it can also achieve large-current charge and discharge freely. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By referring to the accompanying drawings and describing its exemplary embodiments in detail, the above and other features and advantages of the present application will become more apparent.

[0024] Figure 1The figure shows a schematic diagram of a battery system control circuit with flexible control of charge and discharge channels according to an embodiment of the present application.

[0025] Reference numerals: 1 fuse; 2 first relay; 3 discharge freewheeling diode; 4 battery; 5 battery management system; 6 charge freewheeling diode; 7 second relay; 8 shunt; 9 battery charge and discharge port. Detailed implementation manners

[0026] To make the objectives, technical solutions, beneficial effects and remarkable progress of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the embodiments of the present application. Obviously, all the described embodiments are only part of the embodiments of the present application, rather than all the embodiments; based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts belong to the scope of protection of the present application.

[0027] The present application will be further elaborated below in conjunction with specific implementations. It should be understood that these embodiments are only used to illustrate the present application and not to limit the scope of the present application.

[0028] As used herein, the phrase "embodiment" means that a specific feature, structure or characteristic described in conjunction with the embodiment may be included in at least one embodiment of the present application. This phrase appearing in various positions in the specification does not necessarily refer to the same embodiment, nor is it limited to mutually exclusive independent or alternative embodiments. Those skilled in the art should be able to understand that the embodiments in the present application can be combined with other embodiments without structural conflicts.

[0029] In the description herein, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", "connection" should be understood in a broad sense, which can be a movable connection, a fixed connection or integrated, or can be connected through a certain connecting piece. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to specific situations.

[0030] In the description herein, terms indicating orientation or positional relationships such as "upper", "lower", "left", "right", "horizontal", "vertical", "height", "length", "width" are intended to accurately describe the embodiments and simplify the description, rather than limiting the parts or structures involved to have a specific orientation, be installed or operated in a specific orientation, and should not be construed as a limitation to the embodiments in the present application.

[0031] In the description herein, terms such as "first" and "second" are only used to distinguish different objects, and cannot be understood as indicating relative importance or limiting the quantity, specific order or primary-secondary relationship of the described technical features. In the description herein, the meaning of "a plurality" is at least two.

[0032] Embodiments of the present application will now be described in detail with reference to the accompanying drawings. Preferred embodiments of the present application will now be described in detail, examples of which are shown in the accompanying drawings. Whenever possible, the same reference numerals will be used throughout the drawings to represent the same or similar parts.

[0033] Figure 1 A schematic diagram of a battery system control circuit with flexible control of charge and discharge channels according to an embodiment of the present application is shown. As Figure 1 shown, a battery system control circuit with flexible control of charge and discharge channels according to the present application includes

[0034] Positive electrode circuit: The positive electrode of battery 4, first relay 2, fuse 1, and the positive electrode of battery charge and discharge port 9 are connected in series in sequence; the first relay 2 and a discharge freewheeling diode 3 are reversely connected in parallel; Negative electrode circuit: The negative electrode of battery 4, second relay 7, shunt 8, and the negative electrode of battery charge and discharge port 9 are connected in series in sequence; the second relay 7 and a charging freewheeling diode 6 are reversely connected in parallel; It further includes a battery management system 5, whose first end is connected to battery 4 for collecting cell voltage, whose second end is connected to the first relay 2, whose third end is connected to the second relay 7, and whose fourth end is connected to the shunt 8.

[0035] Specifically, in some embodiments of the present application, the first relay 2 can be selected as a normally open high-voltage relay with a withstand voltage ≥ 100V, and the second relay 7 can be selected as a normally closed low-resistance relay with a contact resistance ≤ 0.5mΩ. The high-voltage relay can withstand high voltage and reliably cut off overvoltage faults, avoiding the risk of breakdown and ensuring charging safety. The low-resistance relay can reduce heat generation and avoid contact aging or adhesion caused by temperature rise. Through the complementary design of the two, power consumption and safety can be further optimized.

[0036] As can be understood by those skilled in the art, the present application realizes the function of separating the charge and discharge channels by connecting diodes in parallel at both ends of the relay on the charge and discharge control channels, and utilizes the freewheeling and reverse cut-off characteristics of the diodes, ensuring that the battery system can execute charge and discharge intelligently and effectively throughout the operation process. At the same time, it can achieve large-current charge and discharge freely.

[0037] The battery management system 5 is configured to: control the first relay 2 and the second relay 7 to close, conduct the positive electrode circuit and the negative electrode circuit; when detecting overvoltage during battery charging, control the first relay 2 to disconnect, and the discharge freewheeling diode 3 is reversely cut off to cut off the charging circuit. When detecting a discharge current, control the first relay 2 to close, and the discharge current passes through the first relay 2 channel; when detecting undervoltage during battery 4 discharge, control the second relay 7 to disconnect, and the charging freewheeling diode 6 is reversely cut off to cut off the discharge circuit. When detecting a charging current, control the second relay 7 to close, and the charging current passes through the second relay 7 channel.

[0038] Preferably, in some embodiments of the present application, the battery management system 5 is set to: confirm the normal operation of the battery management system 5 in the power-on self-check mode. Specifically, the self-check mode may include: sending a 10 ms pulse signal to the first relay 2 and the second relay 7 to detect whether their action time is ≤ 20 ms, injecting a test current of, for example, 1 mA through the shunt 8 to verify whether the voltage drop of the discharge freewheeling diode 3 is within the normal range. All the above parameters can be adjusted by those skilled in the art according to actual needs.

[0039] Preferably, in some embodiments of the present application, the fifth terminal of the battery management system 5 is connected to the battery 4 for collecting the cell temperature and adjusting the overvoltage and / or undervoltage thresholds of the battery 4 in real time based on the cell temperature. For example, in some embodiments of the present application, when it is detected that the cell temperature > 50 °C, the overvoltage threshold of the battery 4 can be controlled to decrease by 5%, and the undervoltage threshold can be controlled to increase by 3%.

[0040] Preferably, in some embodiments of the present application, the discharge freewheeling diode 3 is a series combination of a fast recovery diode and a surge protection diode. The cathode of the fast recovery diode is connected to the positive electrode of the battery 4, and the charging freewheeling diode 6 is a Schottky diode. Specifically, in some embodiments of the present application, the discharge freewheeling diode 3 is a series combination of a fast recovery diode and a surge protection diode. For example, by connecting the UF4007 and 15KP series diodes in series, high-frequency spikes and high-voltage surges can be suppressed simultaneously.

[0041] Preferably, in some embodiments of the present application, the battery management system 5 is set to: when it is detected that the battery 4 is overcharged, control the first relay 2 to disconnect, and re-close after detecting that the discharge current ≥ 1 A and lasts for 10 ms, which can avoid false triggering.

[0042] When it is detected that the battery 4 is underdischarged, control the second relay 7 to disconnect, and re-close when it is detected that the charging current ≥ 1 A.

[0043] Specifically, in some embodiments of the present application, the battery 4 is selected as a lithium battery system. After the lithium battery system is powered on, the battery management system 5 first performs self-check. When there is no fault, the battery management system 5 issues an instruction to control the first relay 2 and the second relay 7 to close, thereby opening the charge and discharge channels of the battery system to perform charging or discharging functions with external charge and discharge devices. When the battery management system 5 detects that the battery 4 is overvoltage, the battery management system 5 issues an instruction to control the first relay 2 to disconnect, and the discharge freewheeling diode 3 is reversely cut off, thereby cutting off the charging circuit to stop charging. When the external device needs to discharge, the lithium battery system realizes discharge through the freewheeling of the discharge freewheeling diode 3. Once the battery management system 5 detects a discharge current, the battery management system 5 quickly controls the first relay 2 to close. After the first relay 2 closes, the discharge freewheeling diode 3 can be effectively bypassed, and the discharge current passes through the first relay 2 channel to avoid the heating problem caused by the current passing through the discharge freewheeling diode 3 for a long time. When the battery management system 5 detects that the battery 4 is undervoltage during discharge, the battery management system 5 issues an instruction to control the second relay 7 to disconnect, and the charge freewheeling diode 6 is reversely cut off, thereby cutting off the discharge circuit to stop discharging. When the lithium battery system needs to charge, the lithium battery system realizes charging through the freewheeling of the charge freewheeling diode 6. When the battery management system 5 detects a charging current, the battery management system 5 quickly controls the second relay 7 to close. After the second relay 7 closes, the charge freewheeling diode 6 can be effectively bypassed, and the charging current passes through the second relay 7 channel to avoid the heating problem caused by the current passing through the charge freewheeling diode 6 for a long time. In this way, both the separation of the charge and discharge channels can be achieved, and the requirements for large current charge and discharge can be met.

[0044] According to another aspect of the present application, the present application also provides a battery control method with flexible control of charge and discharge channels, including the control circuit of any one of the above embodiments. The control method includes: controlling the first relay 2 and the second relay 7 to close to conduct the positive electrode circuit and the negative electrode circuit; when it is detected that the battery 4 is overvoltage during charging, controlling the first relay 2 to disconnect, and the discharge freewheeling diode 3 is reversely cut off to cut off the charging circuit. When a discharge current is detected, controlling the first relay 2 to close, and the discharge current passes through the first relay 2 channel; when it is detected that the battery 4 is undervoltage during discharge, controlling the second relay 7 to disconnect, and the charge freewheeling diode 6 is reversely cut off to cut off the discharge circuit. When a charging current is detected, controlling the second relay 7 to close, and the charging current passes through the second relay 7 channel.

[0045] Preferably, in some embodiments of the present application, it further includes: the battery management system 5 starts the self-check mode when it is powered on to confirm that the battery management system 5 is normal.

[0046] Preferably, in some embodiments of the present application, it further includes: The battery management system 5 adjusts the overvoltage and / or undervoltage thresholds of the battery 4 in real time based on the cell temperature. For example, in some embodiments of the present application, when it is detected that the cell temperature > 50 °C, the overvoltage threshold of the battery 4 is controlled to be reduced by 5%.

[0047] Preferably, in some embodiments of the present application, it further includes: When it is detected that the battery 4 is overvoltage during charging, the first relay 2 is controlled to disconnect, and it is re-closed after detecting that the discharge current ≥ 1 A and lasts for 10 ms; when it is detected that the battery 4 is undervoltage during discharging, the second relay 7 is controlled to disconnect, and it is re-closed when detecting that the charging current ≥ 1 A.

[0048] Specifically, in some embodiments of the present application, the battery 4 is a lithium battery system. After the lithium battery system is powered on, the battery management system 5 first performs self-check. When there is no fault, the battery management system 5 issues an instruction to control the first relay 2 and the second relay 7 to close, thereby opening the charge and discharge channels of the battery system and performing charging or discharging functions with external charge and discharge devices. When the battery management system 5 detects that the battery 4 is overvoltage, the battery management system 5 issues an instruction to control the first relay 2 to disconnect, and the discharge freewheeling diode 3 is reversely cut off, thereby cutting off the charging circuit and stopping charging. When the external device needs to discharge, the lithium battery system realizes discharging through the discharge freewheeling diode 3. Once the battery management system 5 detects a discharge current, the battery management system 5 quickly controls the first relay 2 to close. After the first relay 2 closes, it can effectively bypass the discharge freewheeling diode 3 and let the discharge current pass through the first relay 2 channel to avoid the heating problem caused by the current passing through the discharge freewheeling diode 3 for a long time; when the battery management system 5 detects that the battery 4 is undervoltage during discharging, the battery management system 5 issues an instruction to control the second relay 7 to disconnect, and the charging freewheeling diode 6 is reversely cut off, thereby cutting off the discharge circuit and stopping discharging. When the lithium battery system needs to charge, the lithium battery system realizes charging through the charging freewheeling diode 6. When the battery management system 5 detects a charging current, the battery management system 5 quickly controls the second relay 7 to close. After the second relay 7 closes, it can effectively bypass the charging freewheeling diode 6 and let the charging current pass through the second relay 7 channel to avoid the heating problem caused by the current passing through the charging freewheeling diode 6 for a long time. In this way, both the separation of the charge and discharge channels can be achieved, and the requirements for large current charge and discharge can be met.

[0049] According to another aspect of the present application, the present application further provides a computer-readable storage medium, on which computer instructions are stored. When the computer instructions are executed by a processor, the control methods of any of the above embodiments can be implemented. The computer instructions further include: A threshold optimization algorithm based on historical data executed according to the number of battery 4 cycles according to the following formula, dynamically adjusting the overvoltage / undervoltage threshold to extend the life of the battery 4.

[0050] ,

[0051] wherein, V threshold is the overvoltage / undervoltage threshold voltage, V0 is the initial overvoltage or undervoltage protection threshold set in the battery management system 5, N is the number of cycles, and k is the attenuation coefficient). For example, when k is 0.001, it means that the threshold decreases by 0.1% per cycle. As the battery ages, appropriately reducing the overvoltage threshold and increasing the undervoltage threshold can effectively extend the battery life.

[0052] It also includes automatically calibrating the error that the output signal is not zero when the shunt 8 has zero current input every 24 hours.

[0053] A battery system control circuit, control method, and storage medium with flexible control of charge and discharge channels according to the present application have a relatively simple structure and low cost. By connecting a diode in parallel at both ends of the relay on the charge and discharge control channel and utilizing the freewheeling and reverse cut-off characteristics of the diode, the functions of separating the charging and discharging channels of the MOS tube scheme can be realized, ensuring that the battery system intelligently and effectively executes charge and discharge throughout the operation process. At the same time, it can freely achieve large-current charge and discharge.

[0054] The above describes the preferred embodiments of the present application. It should be understood that the present application is not limited to the above specific embodiments, and the devices and structures not described in detail should be understood to be implemented in a common manner in the art; any person skilled in the art can make many possible changes and modifications to the technical solution of the present application or modify it into an equivalent embodiment with equivalent changes without departing from the scope of the technical solution of the present application, which does not affect the essence of the present application. Therefore, any simple modification, equivalent change, and modification made to the above embodiments based on the technical essence of the present application without departing from the content of the technical solution of the present application still fall within the scope of protection of the technical solution of the present application.

Claims

1. A battery control circuit with flexible control of charge and discharge channels, characterized in that Including, Positive electrode circuit: The positive electrode of the battery, the first relay, the fuse, and the positive electrode of the battery charging and discharging port are connected in series in sequence; the first relay and a discharge freewheeling diode are reversely connected in parallel; Negative electrode circuit: The negative electrode of the battery, the second relay, the shunt, and the negative electrode of the battery charging and discharging port are connected in series in sequence; the second relay and a charging freewheeling diode are reversely connected in parallel; It further includes a battery management system, whose first end is connected to the battery for collecting the cell voltage, whose second end is connected to the first relay, whose third end is connected to the second relay, and whose fourth end is connected to the shunt; The battery management system is set as: Control the first relay and the second relay to close, and conduct the positive electrode circuit and the negative electrode circuit; When it is detected that the battery is overcharged, control the first relay to disconnect, the discharge freewheeling diode is reversely cut off, and the charging circuit is cut off. When the discharge current is detected, control the first relay to close, and the discharge current passes through the first relay channel; When it is detected that the battery is under-discharged, control the second relay to disconnect, the charging freewheeling diode is reversely cut off, and the discharge circuit is cut off. When the charging current is detected, control the second relay to close, and the charging current passes through the second relay channel.

2. The control circuit according to claim 1, wherein The battery management system is set as: When starting up, enter the self-check mode to confirm that the battery management system is normal.

3. The control circuit according to claim 1, wherein The fifth end of the battery management system is connected to the battery for collecting the cell temperature, and based on the cell temperature, the overvoltage and / or undervoltage thresholds of the battery are adjusted in real time.

4. The control circuit according to claim 1, wherein The discharge freewheeling diode is a series combination of a fast recovery diode and a surge protection diode. The cathode of the fast recovery diode is connected to the positive electrode of the battery, and the charging freewheeling diode is a Schottky diode.

5. The control circuit according to claim 1, wherein The battery management system is set as: When it is detected that the battery is overcharged, control the first relay to disconnect, and re-close after detecting that the discharge current ≥ 1A and lasts for 10 ms; When it is detected that the battery is under-discharged, control the second relay to disconnect, and re-close when detecting that the charging current ≥ 1A.

6. A battery control method with flexible control of charge and discharge channels, characterized in that, Including the control circuit according to any one of claims 1-5, the control method includes: Control the first relay and the second relay to close, and conduct the positive electrode circuit and the negative electrode circuit; When it is detected that the battery is overcharged, control the first relay to disconnect, the discharge freewheeling diode is reversely cut off, and the charging circuit is cut off. When the discharge current is detected, control the first relay to close, and the discharge current passes through the first relay channel; When it is detected that the battery is under-discharged, control the second relay to disconnect, the charging freewheeling diode is reversely cut off, and the discharge circuit is cut off. When the charging current is detected, control the second relay to close, and the charging current passes through the second relay channel.

7. The control method according to claim 6, characterized in that, It further includes: The battery management system starts up and enters the self-check mode to confirm that the battery management system is normal.

8. The control method according to claim 6, wherein It further includes: The battery management system adjusts the overvoltage and / or undervoltage thresholds of the battery in real time based on the cell temperature.

9. The control method according to claim 6, wherein It further includes: When it is detected that the battery is overcharged, control the first relay to disconnect, and re-close after detecting that the discharge current ≥ 1A and lasts for 10 ms; When the under-voltage discharge of the battery is detected, control the second relay to disconnect and re-close when the charging current ≥ 1A is detected.

10. A computer-readable storage medium having computer instructions stored thereon, characterized in that, When the computer instructions are executed by a processor, implement the control method according to any one of claims 6-9.

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