Battery Charging and Discharging Control Method, System, Device and Storage Medium

Abstract

The present invention discloses a battery charge and discharge control method, system, device and storage medium. A superconducting device and a relay are provided on the charge and discharge circuit of the battery. The control method includes: detecting whether the charge and discharge rate of the battery exceeds a first preset threshold; if so, controlling and adjusting the resistance value of the superconducting device to adjust the charge and discharge rate of the battery to a second preset threshold; the charge and discharge rate includes a charge rate or a discharge rate; controlling the relay to disconnect. According to the harm situation of the charge and discharge rate, the present invention applies different impedances to the high-voltage charge and discharge circuit of the battery system through the superconducting device to reduce the charge and discharge rate or keep the charge and discharge rate within a safe range, avoiding damage to the relay adhesion, fuse melting or other electrical components on the circuit caused by the passive load disconnection of the high voltage due to external short circuit or excessive charge and discharge rate of the battery system.

Description

Technical Field

[0001] The present invention belongs to the technical field of battery protection, and particularly relates to a battery charge and discharge control method, system, device and storage medium. Background Art

[0002] In the prior art, when an external short circuit occurs in the battery system or the charge and discharge rate is too high, the battery system itself can respond by forcibly disconnecting the relay under load. However, if the current in the charge and discharge circuit is too high, it is very likely that the relay cannot be disconnected. At this time, only the fuse can be melted to passively respond to the occurrence of hazards. Although the battery system and the load can be protected to a certain extent, irreversible damage has been caused to the relay, fuse and other electrical components on the circuit. Usually, the damaged electrical components need to be replaced to avoid secondary hazards. At the same time, the driving hazards caused by the passive disconnection of high voltage in the battery system also threaten the safety of the vehicle occupants. Summary of the Invention

[0003] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art and provide a battery charge and discharge control method, system, device and storage medium.

[0004] The present invention solves the above technical problem through the following technical solutions:

[0005] A battery charge and discharge control method, wherein a superconducting device and a relay are provided on the charge and discharge circuit of the battery, and the control method includes:

[0006] Detect whether the charge and discharge rate of the battery exceeds a first preset threshold;

[0007] If so, control and adjust the resistance value of the superconducting device to adjust the charge and discharge rate of the battery to a second preset threshold; the charge and discharge rate includes the charge rate or the discharge rate;

[0008] Control the relay to disconnect.

[0009] Preferably, if the charge and discharge rate exceeds the first preset threshold, the following steps are first executed, including:

[0010] Detect whether the external load connected to the battery is short-circuited;

[0011] If so, then execute the step of controlling and adjusting the resistance value of the superconducting device to adjust the charge and discharge rate of the battery to the second preset threshold.

[0012] Preferably, if the external load is not short-circuited, the following steps are executed, including:

[0013] Detect whether the duration of the non-superconducting state of the superconducting device exceeds a preset time threshold;

[0014] If so, perform the step of controlling and adjusting the resistance value of the superconducting device to adjust the charge-discharge rate of the battery to a second preset threshold;

[0015] If not, control and adjust the resistance value of the superconducting device to adjust the charge-discharge rate of the battery to a first preset threshold, and then return to perform the step of detecting whether the duration of the non-superconducting state of the superconducting device exceeds a preset time threshold.

[0016] Preferably, the relay includes a main positive relay and a main negative relay;

[0017] The step of controlling the relay to disconnect specifically includes:

[0018] First control the main positive relay to disconnect, and then control the main negative relay to disconnect.

[0019] A battery charge-discharge control system, the control system includes a battery management module, a superconducting device and a relay, the battery management module includes a first detection unit, a first adjustment unit and a switch unit, and the superconducting device and the relay are arranged on the charge-discharge circuit of the battery;

[0020] The first detection unit is used to detect whether the charge-discharge rate of the battery exceeds a first preset threshold, and if so, call the first adjustment unit;

[0021] The first adjustment unit is used to control and adjust the resistance value of the superconducting device to adjust the charge-discharge rate of the battery to a second preset threshold; the charge-discharge rate includes a charge rate or a discharge rate;

[0022] The switch unit is used to control the relay to disconnect.

[0023] Preferably, the battery management module further includes a second detection unit;

[0024] The first detection unit is used to first call the second detection unit when the charge-discharge rate exceeds the first preset threshold;

[0025] The second detection unit is used to detect whether the external load connected to the battery is short-circuited, and if so, call the first adjustment unit again.

[0026] Preferably, the battery management module further includes a third detection unit and a second adjustment unit;

[0027] The second detection unit is used to call the third detection unit when the external load is not short-circuited;

[0028] The third detection unit is used to detect whether the duration of the non-superconducting state of the superconducting device exceeds a preset time threshold. If so, the first adjustment unit is called; if not, the second adjustment unit is called.

[0029] The second adjustment unit is used to control and adjust the resistance value of the superconducting device to adjust the charge and discharge rate of the battery to a first preset threshold, and then call the third detection unit.

[0030] Preferably, the relay includes a main positive relay and a main negative relay;

[0031] The switch unit is used to first control the disconnection of the main positive relay, and then control the disconnection of the main negative relay.

[0032] An electronic device includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the above-mentioned battery charge and discharge control method is implemented.

[0033] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the above-mentioned battery charge and discharge control method is implemented.

[0034] The positive and progressive effects of the present invention are as follows: According to the harm situation of the charge and discharge rate, the present invention applies different impedances to the high-voltage charge and discharge circuit of the battery system through a superconducting device to reduce the charge and discharge rate or keep the charge and discharge rate within a safe range, avoiding damage to relays, fuses, or other electrical components on the circuit caused by the passive load disconnection of the high voltage due to external short circuits or excessive charge and discharge rates in the battery system. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a flowchart of the battery charge and discharge control method according to Embodiment 1 of the present invention.

[0036] Figure 2 It is a schematic diagram of the battery charge and discharge control circuit according to Embodiment 1 of the present invention.

[0037] Figure 3 It is a schematic diagram of the modules of the battery charge and discharge control system according to Embodiment 2 of the present invention.

[0038] Figure 4 It is a schematic diagram of the structure of the electronic device according to Embodiment 3 of the present invention. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0039] The present invention will be further described below by way of examples, but the present invention is not limited to the scope of the described examples.

[0040] Embodiment 1

[0041] A battery charge and discharge control method, where a superconducting device and a relay are provided on the charge and discharge circuit of the battery, as Figure 1 shown, the control method includes:

[0042] Step 11: Detect whether the charge and discharge rate of the battery exceeds a first preset threshold. If so, execute Step 12;

[0043] Step 12: Control and adjust the resistance value of the superconducting device to adjust the charge and discharge rate of the battery to a second preset threshold; the charge and discharge rate includes the charge rate or the discharge rate;

[0044] Step 13: Control the relay to disconnect.

[0045] In this embodiment, in Step 11, if the judgment result is yes, then first execute Step 111;

[0046] Step 111: Detect whether the external load connected to the battery is short-circuited. If so, then execute Step 12. If not, then execute Step 14;

[0047] Step 14: Detect whether the duration of the non-superconducting state of the superconducting device exceeds a preset time threshold. If so, then execute Step 12. If not, then execute Step 15;

[0048] Step 15: Control and adjust the resistance value of the superconducting device to adjust the charge and discharge rate of the battery to the first preset threshold, and then return to Step 14.

[0049] In this embodiment, the relay includes a main positive relay and a main negative relay;

[0050] Step 13 specifically includes: first control the main positive relay to disconnect, and then control the main negative relay to disconnect.

[0051] Refer to Figure 2 , which shows a schematic diagram of a battery charge and discharge control circuit. A fuse 21, a main positive relay 22, a pre-charge relay 23, a fast charge positive relay 24, a fast charge negative relay 25, a main negative relay 26, a current sensor 27 (for detecting the charge and discharge current of the battery and calculating the charge and discharge rate), an SLS superconducting device 28, a battery 29, a BMS 31 battery management system, and external interfaces (a discharge port 32, a low-voltage interface 33, and a fast charge port 34) are provided on the charge and discharge circuit of the battery. The external interfaces are used to connect to an external load. The control method of this embodiment is controlled and adjusted on the premise of load power reduction failure. The following will separately describe the charging process and the discharging process:

[0052] I. Discharging process

[0053] In the case of non - short - circuit, when the load uses a discharge rate greater than the currently allowed discharge rate of the battery system (PACK), the BMS controls the SLS superconducting device (whose resistance changes based on temperature changes and can be adjusted by temperature regulation) to increase the impedance of the PACK discharge high - voltage circuit, thereby reducing the discharge rate. First, maintain the discharge rate not greater than the currently allowed discharge rate of the PACK. When the non - superconducting state maintenance time of the SLS is greater than its safety time (if in a high - temperature state for a long time, the circuit is continuously in an over - current state, making the whole circuit unsafe), the BMS controls the SLS to limit the discharge rate to the safe discharge rate at which the relay can disconnect (a rated value, which is different for different relays). The BMS first disconnects the main positive relay and then the main negative relay, and the discharge high - voltage circuit is disconnected.

[0054] In the case of short - circuit, the BMS controls the SLS to increase the impedance of the PACK discharge high - voltage circuit, limits the discharge rate of the discharge circuit to the safe discharge rate at which the relay can disconnect. The BMS first disconnects the main positive relay and then the main negative relay, and the discharge high - voltage circuit is disconnected.

[0055] II. Charging process

[0056] In the case of non - short - circuit, when the load uses a charging rate greater than the currently allowed charging rate of the battery system PACK, the BMS controls the SLS superconducting device (whose resistance changes based on temperature changes and can be adjusted by temperature regulation) to increase the impedance of the PACK charging high - voltage circuit, thereby reducing the charging rate. First, maintain the charging rate not greater than the currently allowed charging rate of the PACK. When the non - superconducting state maintenance time of the SLS is greater than its safety time (if in a high - temperature state for a long time, the circuit is continuously in an over - current state, making the whole circuit unsafe), the BMS controls the SLS to limit the charging rate to the safe charging rate at which the relay can disconnect (a rated value, which is different for different relays). The BMS first disconnects the main positive relay and then the main negative relay, and the charging high - voltage circuit is disconnected.

[0057] In the case of short - circuit, the BMS controls the SLS to increase the impedance of the PACK charging high - voltage circuit, limits the charging rate of the charging circuit to the safe charging rate at which the relay can disconnect. The BMS first disconnects the main positive relay and then the main negative relay, and the charging high - voltage circuit is disconnected.

[0058] In this embodiment, according to the harm situation of the charge - discharge rate, different impedances are applied to the high - voltage charge - discharge circuit of the battery system through the superconducting device to reduce the charge - discharge rate or keep the charge - discharge rate within a safe range, avoiding damage to relays, fuses, or other electrical components on the circuit caused by the passive load disconnection of the high - voltage due to external short - circuit or excessive charge - discharge rate of the battery system.

[0059] Embodiment 2

[0060] A battery charge and discharge control system, as Figure 3 shown, the control system includes a battery management module 4, a superconducting device 5 and a relay 6. The battery management module 4 includes a first detection unit 41, a first adjustment unit 42 and a switch unit 43. The superconducting device 5 and the relay 6 are arranged on the charge and discharge circuit of the battery;

[0061] The first detection unit 41 is used to detect whether the charge and discharge rate of the battery exceeds a first preset threshold. If so, the first adjustment unit 42 is called;

[0062] The first adjustment unit 42 is used to control and adjust the resistance value of the superconducting device 5 to adjust the charge and discharge rate of the battery to a second preset threshold; the charge and discharge rate includes a charge rate or a discharge rate;

[0063] The switch unit 43 is used to control the relay 6 to disconnect.

[0064] In this embodiment, referring to Figure 3 , the battery management module 4 further includes a second detection unit 44;

[0065] The first detection unit 41 is used to first call the second detection unit 44 when the charge and discharge rate exceeds the first preset threshold;

[0066] The second detection unit 44 is used to detect whether the external load connected to the battery is short-circuited. If so, the first adjustment unit 42 is called again.

[0067] In this embodiment, referring to Figure 3 , the battery management module 4 further includes a third detection unit 45 and a second adjustment unit 46;

[0068] The second detection unit 44 is used to call the third detection unit 45 when the external load is not short-circuited;

[0069] The third detection unit 45 is used to detect whether the duration of the non-superconducting state of the superconducting device 5 exceeds a preset time threshold. If so, the first adjustment unit 42 is called. If not, the second adjustment unit 46 is called;

[0070] The second adjustment unit 46 is used to control and adjust the resistance value of the superconducting device 5 to adjust the charge and discharge rate of the battery to the first preset threshold, and then call the third detection unit 45.

[0071] In this embodiment, referring to Figure 3 , the relay 6 includes a main positive relay 61 and a main negative relay 62;

[0072] The switch unit 43 is used to first control the disconnection of the main positive relay 61 and then control the disconnection of the main negative relay 62.

[0073] In this embodiment, according to the harm situation of the charge and discharge rate, different impedances are applied to the high-voltage charge and discharge loop of the battery system through the superconducting device to reduce the charge and discharge rate or keep the charge and discharge rate within a safe range, so as to avoid the adhesion of the relay, the fusing of the fuse or the damage of other electrical components on the loop caused by the passive load disconnection of the high voltage due to external short circuit or excessive charge and discharge rate of the battery system.

[0074] Embodiment 3

[0075] An electronic device includes a memory, a processor, and a computer program stored on the memory and executable on the processor. When the processor executes the computer program, the battery charge and discharge control method described in Embodiment 1 is implemented.

[0076] Figure 4 It is a schematic structural diagram of an electronic device provided in this embodiment. Figure 4 The block diagram of an exemplary electronic device 90 suitable for implementing the embodiments of the present invention is shown. Figure 4 The displayed electronic device 90 is only an example and should not impose any limitations on the functions and usage scope of the embodiments of the present invention.

[0077] As Figure 4 shown, the electronic device 90 may be presented in the form of a general-purpose computing device, for example, it may be a server device. The components of the electronic device 90 may include, but are not limited to: at least one processor 91, at least one memory 92, and a bus 93 connecting different system components (including the memory 92 and the processor 91).

[0078] The bus 93 includes a data bus, an address bus, and a control bus.

[0079] The memory 92 may include volatile memory, such as random access memory (RAM) 921 and / or cache memory 922, and may further include read-only memory (ROM) 923.

[0080] The memory 92 may further include a program tool 925 having a set (at least one) of program modules 924. Such program modules 924 include, but are not limited to: an operating system, one or more application programs, other program modules, and program data. Each or some combination of these examples may include the implementation of a network environment.

[0081] The processor 91 executes various functional applications and data processing by running the computer program stored in the memory 92.

[0082] The electronic device 90 can also communicate with one or more external devices 94 (such as a keyboard, a pointing device, etc.). This kind of communication can be carried out through the input / output (I / O) interface 95. Moreover, the electronic device 90 can also communicate with one or more networks (such as a local area network (LAN), a wide area network (WAN) and / or a public network, such as the Internet) through the network adapter 96. The network adapter 96 communicates with other modules of the electronic device 90 through the bus 93. It should be understood that, although not shown in the figure, other hardware and / or software modules can be used in combination with the electronic device 90, including but not limited to: microcode, device drivers, redundant processors, external disk drive arrays, RAID (redundant array of independent disks) systems, tape drives, and data backup storage systems, etc.

[0083] It should be noted that although several units / modules or sub-units / modules of the electronic device are mentioned in the above detailed description, this kind of division is only exemplary and not mandatory. In fact, according to the embodiments of the present application, the features and functions of two or more units / modules described above can be embodied in one unit / module. Conversely, the features and functions of one unit / module described above can be further divided and embodied by multiple units / modules.

[0084] Embodiment 4

[0085] A computer-readable storage medium, on which a computer program is stored, and when the computer program is executed by a processor, it implements the battery charge and discharge control method described in Embodiment 1.

[0086] Among them, the more specific forms that the readable storage medium can adopt can include but not limited to: portable disks, hard disks, random access memories, read-only memories, erasable programmable read-only memories, optical storage devices, magnetic storage devices, or any suitable combination of the above.

[0087] In a possible implementation manner, the present invention can also be implemented in the form of a program product, which includes program code, and when the program product runs on a terminal device, the program code is used to make the terminal device execute the battery charge and discharge control method described in Embodiment 1.

[0088] Among them, the program code for executing the present invention can be written in any combination of one or more programming languages, and the program code can be executed completely on the user device, partially on the user device, executed as an independent software package, partially on the user device and partially on a remote device, or executed completely on a remote device.

[0089] Although the specific embodiments of the present invention have been described above, those skilled in the art should understand that this is only an example, and the protection scope of the present invention is defined by the appended claims. Without departing from the principles and essence of the present invention, those skilled in the art can make various changes or modifications to these embodiments, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A method for controlling battery charge and discharge, characterized in that, a superconducting device and a relay are provided on the charge and discharge circuit of the battery, and the control method includes: detecting whether the charge and discharge rate of the battery exceeds a first preset threshold; if so, controlling and adjusting the resistance value of the superconducting device to adjust the charge and discharge rate of the battery to a second preset threshold; the charge and discharge rate includes the charge rate or the discharge rate; controlling the relay to disconnect; if the charge and discharge rate exceeds the first preset threshold, first perform the following steps, including: detecting whether an external load connected to the battery is short-circuited; if so, then perform the step of controlling and adjusting the resistance value of the superconducting device to adjust the charge and discharge rate of the battery to a second preset threshold; if the external load is not short-circuited, then perform the following steps, including: detecting whether the duration of the non-superconducting state of the superconducting device exceeds a preset time threshold; if so, perform the step of controlling and adjusting the resistance value of the superconducting device to adjust the charge and discharge rate of the battery to a second preset threshold; if not, control and adjust the resistance value of the superconducting device to adjust the charge and discharge rate of the battery to the first preset threshold, and then return to perform the step of detecting whether the duration of the non-superconducting state of the superconducting device exceeds the preset time threshold.

2. The battery charge and discharge control method according to claim 1, characterized in that, the relay includes a main positive relay and a main negative relay; the step of controlling the relay to disconnect specifically includes: first controlling the main positive relay to disconnect, and then controlling the main negative relay to disconnect.

3. A battery charge and discharge control system, characterized in that, the control system includes a battery management module, a superconducting device and a relay, the battery management module includes a first detection unit, a first adjustment unit and a switch unit, and the superconducting device and the relay are arranged on the charge and discharge circuit of the battery; the first detection unit is used for detecting whether the charge and discharge rate of the battery exceeds a first preset threshold, and if so, calling the first adjustment unit; the first adjustment unit is used for controlling and adjusting the resistance value of the superconducting device to adjust the charge and discharge rate of the battery to a second preset threshold; the charge and discharge rate includes the charge rate or the discharge rate; the switch unit is used for controlling the relay to disconnect; the battery management module further includes a second detection unit; the first detection unit is used for first calling the second detection unit when the charge and discharge rate exceeds the first preset threshold; the second detection unit is used for detecting whether an external load connected to the battery is short-circuited, and if so, calling the first adjustment unit; the battery management module further includes a third detection unit and a second adjustment unit; the second detection unit is used for calling the third detection unit when the external load is not short-circuited; the third detection unit is used for detecting whether the duration of the non-superconducting state of the superconducting device exceeds a preset time threshold, and if so, calling the first adjustment unit, and if not, calling the second adjustment unit; The second adjustment unit is used to control and adjust the resistance value of the superconducting device so as to adjust the charge-discharge rate of the battery to a first preset threshold, and then call the third detection unit.

4. The battery charge-discharge control system according to claim 3, wherein, the relay includes a main positive relay and a main negative relay; the switch unit is used to first control the disconnection of the main positive relay, and then control the disconnection of the main negative relay.

5. An electronic device, comprising a memory, a processor, and a computer program stored on the memory and executable on the processor, wherein, when the processor executes the computer program, the battery charge-discharge control method according to any one of claims 1 to 2 is implemented.

6. A computer-readable storage medium, on which a computer program is stored, wherein, when the computer program is executed by a processor, the battery charge-discharge control method according to any one of claims 1 to 2 is implemented.

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