Battery control circuit with system lock, control method and storage medium

Abstract

The invention discloses a battery control circuit with a system lock, a control method and a storage medium, and the control circuit comprises a main loop and an auxiliary loop. The positive electrode of a battery is sequentially connected with a release, a circuit breaker, a fuse and the positive electrode of an energy storage inverter in series; the negative electrode of the battery is sequentially connected in series with the discharging Mos tube, the charging Mos tube, the current detector and the negative electrode of the energy storage inverter; the release is coupled with the circuit breaker through a mechanical connecting rod; the first end of the BMS is connected to a voltage acquisition sensor of the battery, the second end of the BMS is connected to a temperature acquisition sensor of the battery, the third end of the BMS is connected to the release, the fourth end of the BMS is connected to the discharging Mos tube, and the fifth end of the BMS is connected to the charging Mos tube; and the sixth end of the comparator is connected to the current detector. According to the invention, the battery management system BMS cooperatively controls the tripper to control the circuit breaker to trip to protect the battery.

Description

Technical Field

[0001] This application relates to the technical field of battery management, and specifically relates to a battery control circuit with a system lock, a control method, and a storage medium. Background Art

[0002] The charge and discharge control circuit of a battery system usually relies on MOS transistors or relays for control. Under normal operating conditions, when the BMS detects that the system has overvoltage, overcurrent, and overtemperature protection thresholds, the BMS can control the MOS transistors and relays to cut off the charge and discharge circuit to protect the battery.

[0003] However, during use, due to various reasons, both MOS transistors and relays may be damaged. A common damage mode of MOS transistors is that the transistor is short-circuited (drain-to-source breakdown), and a common damage mode of relays is that the relay contacts stick together. In the case of a MOS transistor or relay contact sticking together, even if the BMS issues a control command, it cannot effectively turn off the MOS transistor and the relay, resulting in the out-of-control of the charge and discharge circuit and the continuous DC output of the battery. In this case, the battery system will be very dangerous and easily cause a short circuit in the battery output or an electric shock accident.

[0004] In this case, a controllable fuse or a dual-MOS-transistor and dual-relay method is mostly used for protection;

[0005] Controllable fuse: A controllable fuse is set on the battery charge and discharge channel. Once the control circuit of the battery charge and discharge channel is out of control due to MOS transistor breakdown or relay contact sticking together, resulting in the failure of overvoltage, overcurrent, and overtemperature protection, the BMS will control the controllable fuse to blow to achieve battery protection. However, once the fuse blows in this method, it cannot be restored.

[0006] Dual-MOS-transistor and dual-relay: Dual MOS transistors or dual relays are used to control the battery charge and discharge channel. Once the BMS detects serious warnings of overvoltage, overcurrent, and overtemperature in the battery, the BMS will issue a command to disconnect the dual MOS transistors or dual relays. In this way, even if one MOS transistor is broken down or one relay contact sticks together, the other MOS transistor or the other relay can effectively cut off the charge and discharge circuit to protect the battery. However, this method has complex software and hardware designs, high hardware circuit costs, and there may also be cases where both dual MOS transistors are damaged or both relay contacts stick together simultaneously. Summary of the Invention

[0007] In view of the above problems, the purpose of the present application is to provide a battery control circuit with a system lock, a control method and a storage medium, which can schedule and control the energy of the energy storage inverter through the battery management system BMS, and when it is determined that the charging and discharging circuit is out of control, or the battery voltage, current, temperature, cell voltage difference, cell temperature difference, etc. are abnormal, the battery management system BMS cooperates with the control of the release to control the circuit breaker to trip to protect the battery.

[0008] According to one aspect of the present application, a battery control circuit with a system lock is provided, and the control circuit includes:

[0009] Main circuit: The positive pole of the battery is sequentially connected in series with a release, a circuit breaker, a fuse, and the positive pole of the energy storage inverter; the negative pole of the battery is sequentially connected in series with a discharge Mos tube, a charging Mos tube, a current detector, and the negative pole of the energy storage inverter; the release and the circuit breaker are coupled by a mechanical link;

[0010] Battery management system BMS: Its first end is connected to the voltage acquisition sensor of the battery, its second end is connected to the temperature acquisition sensor of the battery, its third end is connected to the release, its fourth end is connected to the discharge Mos tube, and its fifth end is connected to the charging Mos tube; its sixth end is connected to the current detector;

[0011] The battery management system BMS is set to:

[0012] Trigger the system lock protection based on the following conditions:

[0013] When the battery is overvoltage, after instructing to disconnect the charging Mos tube, the battery voltage continues to rise to the overvoltage system lock protection threshold;

[0014] And / or, when the battery charging and discharging current is overcurrent, after instructing to disconnect the discharge Mos tube and the charging Mos tube, the current value of the input and output battery continues to rise to the system lock protection threshold;

[0015] And / or, when the battery is overheated, after instructing to disconnect the discharge Mos tube and the charging Mos tube, the battery temperature continues to rise to the system lock protection threshold;

[0016] And / or, when the cell voltage difference or temperature difference inside the battery exceeds the set threshold, after instructing to disconnect the discharge Mos tube and the charging Mos, the cell voltage difference or temperature difference of the battery continues to rise to the system lock protection threshold;

[0017] And / or, during the battery standby period, the cell voltage inside the battery drops abnormally or the cell temperature rises abnormally to the system lock protection threshold within a short period of time;

[0018] The system lock protection executes the following instructions:

[0019] Provide a control current for the release, the release drives the mechanical link to control the circuit breaker to trip, and the charge and discharge circuit of the battery is disconnected; continuously output the control current, the circuit breaker always remains in the tripped state, and the system lock protection is turned on; stop outputting the control current, the circuit breaker releases the tripped state, and the system lock protection is released.

[0020] Preferably, in some embodiments of the present application, the control current is a current of 24V / 1A.

[0021] According to another aspect of the present application, the present application also provides a control method for a battery control circuit with a system lock, including the control circuit of any one of the above embodiments, and the control method includes:

[0022] The battery management system BMS triggers the system lock protection based on the following conditions:

[0023] When the battery is overvoltage, after the instruction to disconnect the charging Mos tube, the battery voltage continues to rise to the overvoltage system lock protection threshold;

[0024] And / or, when the battery charge and discharge is overcurrent, after the instruction to disconnect the discharge Mos tube and the charging Mos tube, the current value of the input and output battery continues to rise to the system lock protection threshold;

[0025] And / or, when the battery is overheated, after the instruction to disconnect the discharge Mos tube and the charging Mos tube, the battery temperature continues to rise to the system lock protection threshold;

[0026] And / or, when the difference in voltage or temperature between the internal battery cells exceeds the set threshold, after the instruction to disconnect the discharge Mos tube and the charging Mos, the difference in voltage or temperature between the battery cells continues to rise to the system lock protection threshold;

[0027] And / or, during the battery rest period, the voltage of the internal battery cells drops abnormally or the cell temperature rises abnormally to the system lock protection threshold within a short period of time;

[0028] The system lock protection executes the following instructions:

[0029] Provide a control current for the release, the release drives the mechanical link to control the circuit breaker to trip, and the charge and discharge circuit of the battery is disconnected; continuously output the control current, the circuit breaker always remains in the tripped state, and the system lock protection is turned on; stop outputting the control current, the circuit breaker releases the tripped state, and the system lock protection is released.

[0030] Preferably, in some embodiments of the present application, the control current is a current of 24V / 1A.

[0031] According to another aspect of the present application, the present application also provides a computer-readable storage medium, on which computer instructions are stored, and when the computer instructions are executed by a processor, the control method of any one of the above embodiments can be implemented.

[0032] It should be understood that within the scope of this application, the above technical features of this application and the technical features specifically described hereinafter (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.

[0033] Compared with the prior art, this application has the following technical effects:

[0034] The battery management system BMS of this application cooperates to control the trip unit to trip the circuit breaker to achieve double protection. After the protection, as long as the control current is continuously output, even if the user restarts the battery system, the battery system cannot output again. Only after on-site processing by professionals can the protection be lifted, which can effectively avoid short circuits or electric shock accidents in the battery system. Brief Description of the Drawings

[0035] By referring to the drawings and describing its exemplary embodiments in detail, the above and other features and advantages of this application will become more obvious.

[0036] Figure 1 The schematic diagram of a battery control circuit with a system lock according to an embodiment of this application is shown.

[0037] Reference Numerals: 1 Battery; 21 Trip Unit; 22 Circuit Breaker; 3 Fuse; 4 Energy Storage Inverter; 5 Discharge Mosfet; 6 Charge Mosfet; 7 Current Detector; 8 Battery Management System BMS; 9 Voltage Acquisition Sensor; 10 Temperature Acquisition Sensor. Detailed Description of the Embodiments

[0038] To make the purpose, technical solutions, beneficial effects, and remarkable progress of the embodiments of this application clearer, hereinafter, the technical solutions in the embodiments of this application will be clearly and completely described in conjunction with the embodiments of this application. Obviously, all these described embodiments are only part of the embodiments of this application, rather than all the embodiments; based on the embodiments in this application, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of this application.

[0039] The following further elaborates this application in combination with specific embodiments. It should be understood that these embodiments are only used to illustrate this application and not to limit the scope of this application.

[0040] The mention of "embodiments" in this text means that the specific features, structures, or characteristics described in conjunction with the embodiments can be included in at least one embodiment of this text. The phrase appearing at 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 this text can be combined with other embodiments without structural conflicts.

[0041] In the description of this article, unless otherwise clearly specified and limited, technical terms such as "installation", "connection", and "coupling" should be understood in a broad sense. It can be a movable connection, a fixed connection or integrated, or a connection through a certain connecting piece. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of this application can be understood according to specific circumstances.

[0042] In the description of this article, terms indicating orientation or positional relationships such as "upper", "lower", "left", "right", "horizontal", "vertical", "height", "length", and "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 this article.

[0043] In the description of this article, 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 of this article, the meaning of "a plurality" is at least two.

[0044] 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, and examples thereof 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.

[0045] Figure 1 The schematic diagram of a battery control circuit with a system lock according to an embodiment of the present application is shown. As Figure 1 shown, a battery control circuit with a system lock of the present application includes:

[0046] Main circuit: The positive electrode of battery 1 is sequentially connected in series with a trip device 21, a circuit breaker 22, a fuse 3, and the positive electrode of an energy storage inverter 4; the negative electrode of battery 1 is sequentially connected in series with a discharge Mos tube 5, a charging Mos tube 6, a current detector 7, and the negative electrode of the energy storage inverter 4; the trip device 21 and the circuit breaker 22 are coupled through a mechanical link;

[0047] Battery management system BMS8: Its first end is connected to the voltage acquisition sensor 9 of battery 1, its second end is connected to the temperature acquisition sensor 10 of battery 1, its third end is connected to the trip device 21, its fourth end is connected to the discharge Mos tube 5, its fifth end is connected to the charging Mos tube 6; its sixth end is connected to the current detector 7;

[0048] The battery management system BMS8 is set to:

[0049] Based on the following conditions, it can be determined that the battery charge and discharge circuit is out of control, and further trigger the system lock protection:

[0050] When the battery 1 is overvoltage, after the charging MOS transistor 6 is commanded to disconnect, the voltage of the battery 1 continues to rise to the overvoltage system lock protection threshold;

[0051] And / or, when the battery 1 is overcurrent during charge and discharge, after the discharging MOS transistor 5 and the charging MOS transistor 6 are commanded to disconnect, the current value input and output to the battery 1 continues to rise to the system lock protection threshold;

[0052] And / or, when the battery 1 is overheated, after the discharging MOS transistor 5 and the charging MOS transistor 6 are commanded to disconnect, the temperature of the battery 1 continues to rise to the system lock protection threshold;

[0053] And / or, when the voltage difference or temperature difference between the internal battery cells of the battery 1 exceeds the set threshold, after the discharging MOS transistor 5 and the charging MOS are commanded to disconnect, the voltage difference or temperature difference between the battery cells of the battery 1 continues to rise to the system lock protection threshold;

[0054] And / or, during the standby period of the battery 1, the voltage of the internal battery cells of the battery 1 abnormally drops within a short time or the temperature of the battery cells abnormally rises to the system lock protection threshold;

[0055] The system lock protection executes the following instructions:

[0056] Provide a control current for the release mechanism, the release mechanism drives the mechanical link to control the circuit breaker to trip, and the charge and discharge circuit of the battery is disconnected; continuously output the control current, the circuit breaker always remains in the tripped state, and the system lock protection is enabled; stop outputting the control current, the circuit breaker releases the tripped state, and the system lock protection is released.

[0057] Preferably, in some embodiments of the present application, the control current is a current of 24V / 1A.

[0058] According to another aspect of the present application, the present application further provides a control method for a battery control circuit with a system lock, including the control circuit of any one of the above embodiments, and the control method includes:

[0059] The battery management system BMS8 can determine that the charge and discharge circuit of the battery is out of control based on the following conditions, and further trigger the system lock protection:

[0060] When the battery 1 is overvoltage, after the charging MOS transistor 6 is commanded to disconnect, the voltage of the battery 1 continues to rise to the overvoltage system lock protection threshold;

[0061] And / or, when the battery 1 is overcurrent during charge and discharge, after the discharging MOS transistor 5 and the charging MOS transistor 6 are commanded to disconnect, the current value input and output to the battery 1 continues to rise to the system lock protection threshold;

[0062] And / or, when the battery 1 is overheated, after the discharging MOS transistor 5 and the charging MOS transistor 6 are commanded to disconnect, the temperature of the battery 1 continues to rise to the system lock protection threshold;

[0063] When the voltage difference or temperature difference between the internal battery cells of Battery 1 exceeds the set threshold, after instructing to disconnect the discharge MOS transistor 5 and the charging MOS, the voltage difference or temperature difference between the battery cells of Battery 1 continues to rise to the system lock protection threshold;

[0064] When Battery 1 is in a static state, the voltage of the internal battery cells of Battery 1 abnormally drops within a short period of time or the temperature of the battery cells abnormally rises to the system lock protection threshold;

[0065] The system lock protection executes the following instructions:

[0066] Provide a control current to the release, the release drives the mechanical link to control the circuit breaker to trip, and the charge and discharge circuit of the battery is disconnected; continuously output the control current, the circuit breaker always remains in the tripped state, and the system lock protection is enabled; stop outputting the control current, the circuit breaker releases the tripped state, and the system lock protection is released.

[0067] Preferably, in some embodiments of the present application, the control current is a current of 24V / 1A.

[0068] According to another aspect of the present application, the present application also 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.

[0069] A battery control circuit, control method and storage medium with a system lock according to the present application break through the limitations of traditional fuses and MOS switches that cannot be reset. Through hardware-level locking, it can ensure the effective disconnection of the charge and discharge circuit of the battery system, provide secondary protection for the battery system, and by stopping the output of the control current, the tripped state can be automatically released, and the system lock protection can be released without manual contact. The structure is simple and the operation is convenient.

[0070] 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, without departing from the scope of the technical solution of the present application, can make many possible changes and modifications to the technical solution of the present application by using the methods and technical contents disclosed above, or modify it into an equivalent embodiment with equivalent changes, 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 the protection of the technical solution of the present application.

Claims

1. A battery control circuit with a system lock, characterized in that, The control circuit includes: Main circuit: The positive pole of the battery is connected in series with a trip device, a circuit breaker, a fuse, and the positive pole of the energy storage inverter in sequence; the negative pole of the battery is connected in series with a discharge Mos tube, a charging Mos tube, a current detector, and the negative pole of the energy storage inverter in sequence; the trip device and the circuit breaker are coupled through a mechanical link; Battery Management System BMS: Its first end is connected to the voltage acquisition sensor of the battery, its second end is connected to the temperature acquisition sensor of the battery, its third end is connected to the trip device, its fourth end is connected to the discharge Mos tube, its fifth end is connected to the charging Mos tube; its sixth end is connected to the current detector; The Battery Management System BMS is set to: Trigger system lock protection based on the following conditions: When the battery is overvoltage, after instructing to disconnect the charging Mos tube, the voltage of the battery continues to rise to the overvoltage system lock protection threshold; and / or, When the battery is overcurrent during charge and discharge, after instructing to disconnect the discharge Mos tube and the charging Mos tube, the current value input and output to the battery continues to rise to the system lock protection threshold; and / or, When the battery is overheated, after instructing to disconnect the discharge Mos tube and the charging Mos tube, the temperature of the battery continues to rise to the system lock protection threshold; and / or, When the voltage difference or temperature difference between the internal battery cells exceeds the set threshold, after instructing to disconnect the discharge Mos tube and the charging Mos, the voltage difference or temperature difference between the battery cells continues to rise to the system lock protection threshold; and / or, During the period when the battery is stationary, the voltage of the internal battery cells drops abnormally or the temperature of the battery cells rises abnormally to the system lock protection threshold within a short time; The system lock protection executes the following instructions: Provide a control current for the trip device, so that the trip device drives the mechanical link to control the circuit breaker to trip, and the charge and discharge circuit of the battery is disconnected; continuously output the control current to ensure that the circuit breaker always remains in the tripped state, and the system lock protection is turned on; stop outputting the control current, and the circuit breaker releases the tripped state, and the system lock protection is released.

2. The control circuit according to claim 1, characterized in that, The control current is a current of 24V / 1A.

3. Control method of a battery control circuit with a system lock, characterized in that, Including the control circuit according to any one of claims 1-2, the control method includes: The Battery Management System BMS triggers system lock protection based on the following conditions: When the battery is overvoltage, after instructing to disconnect the charging Mos tube, the voltage of the battery continues to rise to the overvoltage system lock protection threshold; and / or, When the battery is overcurrent during charge and discharge, after instructing to disconnect the discharge Mos tube and the charging Mos tube, the current value input and output to the battery continues to rise to the system lock protection threshold; and / or, When the battery is overheated, after instructing to disconnect the discharge Mos tube and the charging Mos tube, the temperature of the battery continues to rise to the system lock protection threshold; and / or, When the voltage difference or temperature difference between the internal battery cells exceeds the set threshold, after instructing to disconnect the discharge Mos tube and the charging Mos, the voltage difference or temperature difference between the battery cells continues to rise to the system lock protection threshold; and / or, During the battery's static period, the voltage of the battery cells inside the battery drops abnormally within a short period of time or the temperature of the battery cells rises abnormally to the system lock protection threshold; The system lock protection executes the following instructions: Provide a control current for the release, so that the release drives the mechanical link to control the circuit breaker to trip, and the charge and discharge circuit of the battery is disconnected; continuously output the control current to ensure that the circuit breaker always remains in the tripped state, and the system lock protection is enabled; stop outputting the control current, the circuit breaker releases the tripped state, and the system lock protection is released.

4. The control method according to claim 3, wherein The control current is a current of 24V / 1A.

5. A computer-readable storage medium having computer instructions stored thereon, characterized in that, When the computer instruction is executed by a processor, the control method described in any one of claims 3-4 is implemented.

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