Vehicle battery electrical protection system, method, electronic device and storage medium

Abstract

The present invention discloses a vehicle battery electrical protection system, method, electronic device, and storage medium. In the vehicle battery electrical protection system, a liquid cooling circuit is in contact with a battery module and a battery disconnect unit, respectively. When a water pump is running, the coolant in the liquid cooling circuit passes through the battery module and the battery disconnect unit in sequence. A temperature sensor is used to collect the temperature of the battery disconnect unit. A current sensor is used to detect the total current of the high-voltage circuit where the battery disconnect unit is located. A battery management system is connected to the temperature sensor, the current sensor, and the water pump, respectively. The battery management system is used to control the operation of the water pump according to the temperature and total current of the battery disconnect unit to drive the coolant in the liquid cooling circuit to dissipate heat from the battery disconnect unit, thereby achieving heat dissipation protection for the battery disconnect unit. In addition, the heat dissipation structure of the battery disconnect unit and the battery module is a series structure. Compared with the parallel structure, the series heat dissipation structure is not only simple in structure and fast in heat dissipation, but also has better fluidity.

Description

Technical Field

[0001] The present invention relates to the technical field of electric vehicles, and in particular to a vehicle battery electrical protection system, method, electronic equipment and storage medium. Background Art

[0002] The vehicle's power battery system mainly consists of battery cells, a battery disconnect unit (BDU) and a battery management system (BMS).

[0003] The battery disconnect unit (BCU) is a critical integrated component in a battery system, used to control battery charging and discharging, implement circuit protection, and coordinate the functional conversion and energy distribution of high-voltage accessories such as the drive motor control system, battery management system, charge management system, electric air conditioning, and electric power steering. Therefore, the BCU generates a large amount of heat during operation, which is difficult for the BCU itself to dissipate. This often necessitates the selection of electrical components (fuses, relays, etc.) with high current carrying capacity and higher specifications. This results in a larger, heavier, and more expensive BCU, and it also takes up space in the battery pack, making it insufficient to meet future demands for high-voltage, high-current super-fast charging. Furthermore, if the BCU is not dissipated promptly, the temperature of the heat-generating components will rise, which could even cause a fire in severe cases. Furthermore, the BCU is also a critical component for providing electrical protection for the battery in the battery system. Therefore, it is crucial to ensure that the BCU is dissipated and protected to provide electrical protection for the battery. Summary of the Invention

[0004] The present invention provides a vehicle battery electrical protection system, method, electronic device and storage medium to solve the problem of how to electrically protect the vehicle battery.

[0005] In a first aspect, the present invention provides a vehicle battery electrical protection system, comprising:

[0006] a liquid cooling circuit and a water pump for controlling the liquid cooling circuit, wherein the liquid cooling circuit is in contact with the battery module and the battery disconnect unit respectively, and when the water pump is running, the coolant in the liquid cooling circuit passes through the battery module and the battery disconnect unit in sequence;

[0007] a temperature sensor, configured to collect the temperature of the battery disconnect unit;

[0008] A current sensor, used to detect the total current of the high-voltage circuit where the battery disconnect unit is located;

[0009] A battery management system, wherein the battery management system is respectively connected to the temperature sensor, the current sensor, and the water pump, and is used to determine the speed of the water pump based on the temperature of the battery circuit breaker unit and the total current, and control the water pump to operate at the speed to drive the coolant in the liquid cooling circuit to dissipate heat from the battery circuit breaker unit, wherein the speed is positively correlated with the temperature of the battery circuit breaker unit and the total current.

[0010] In a second aspect, the present invention provides a vehicle battery electrical protection method, which is applied to a vehicle battery electrical protection system. The vehicle battery electrical protection system includes a liquid cooling circuit and a water pump for controlling the liquid cooling circuit. The liquid cooling circuit is in contact with a battery module and a battery disconnect unit, respectively. When the water pump is running, the coolant in the liquid cooling circuit passes through the battery module and the battery disconnect unit in sequence. The method includes:

[0011] collecting the temperature of the battery disconnect unit;

[0012] Detecting the total current of the high-voltage circuit where the battery disconnect unit is located;

[0013] The rotational speed of the water pump is determined according to the temperature of the battery circuit breaker unit and the total current, and the water pump is controlled to operate at the rotational speed to drive the coolant in the liquid cooling circuit to dissipate heat from the battery circuit breaker unit, wherein the rotational speed is positively correlated with the temperature of the battery circuit breaker unit and the total current.

[0014] In a third aspect, the present invention provides an electronic device, comprising:

[0015] at least one processor; and

[0016] a memory communicatively connected to the at least one processor; wherein,

[0017] The memory stores a computer program that can be executed by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to perform the vehicle battery electrical protection method described in the second aspect of the present invention.

[0018] In a fourth aspect, the present invention provides a computer-readable storage medium storing computer instructions, wherein the computer instructions are used to enable a processor to implement the vehicle battery electrical protection method described in the second aspect of the present invention when executed.

[0019] The vehicle battery electrical protection system of an embodiment of the present invention includes a liquid cooling circuit and a water pump, a temperature sensor, a current sensor and a battery management system for controlling the liquid cooling circuit. The liquid cooling circuit is in contact with the battery module and the battery circuit breaker unit respectively. When the water pump is running, the coolant in the liquid cooling circuit passes through the battery module and the battery circuit breaker unit in sequence; the temperature sensor is used to collect the temperature of the battery circuit breaker unit; the current sensor is used to detect the total current of the high-voltage circuit where the battery circuit breaker unit is located; the battery management system is connected to the temperature sensor, the current sensor and the water pump respectively, and is used to control the operation of the water pump according to the temperature and total current of the battery circuit breaker unit, so as to drive the coolant in the liquid cooling circuit to dissipate heat from the battery circuit breaker unit.

[0020] When the total current of the high-voltage circuit where the battery circuit breaker unit is located is large, the battery circuit breaker unit is in a heating state due to the influence of heat generated by internal resistance, that is, a large amount of heat may be generated. Therefore, this embodiment can determine whether the temperature of the battery circuit breaker unit is high or in a heating state by measuring the total current of the high-voltage circuit where the battery circuit breaker unit is located and the temperature of the battery circuit breaker unit. Furthermore, when it is confirmed that the temperature of the battery circuit breaker unit is high or in a heating state, the battery management system can control the operation of the water pump so that the coolant dissipates heat from the battery circuit breaker unit, thereby achieving heat dissipation protection for the battery circuit breaker unit and ensuring safe and reliable operation of the electrical system.

[0021] On the other hand, considering that the heat generated by the battery circuit breaker unit is greater than that of the battery module, the coolant in this embodiment first passes through the battery module and then passes through the battery circuit breaker unit. Therefore, while dissipating the heat of the battery circuit breaker unit, it will not affect the heat dissipation of the battery module. In addition, the heat dissipation structure of the battery circuit breaker unit and the battery module is a series structure. Compared with the parallel structure, the series heat dissipation structure of this embodiment is not only simple in structure and has rapid heat dissipation, but also has better fluidity.

[0022] It should be understood that the content described in this section is not intended to identify the key or important features of the embodiments of the present invention, nor is it intended to limit the scope of the present invention. Other features of the present invention will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0024] Figure 1 This is a schematic structural diagram of a vehicle battery electrical protection system provided in Example 1 of the present invention;

[0025] Figure 2This is a structural diagram of a high-voltage circuit including a battery disconnect unit and a battery module provided in the first embodiment of the present invention;

[0026] Figure 3 This is a comparison diagram of current tolerance curves provided in Example 1 of the present invention;

[0027] Figure 4 This is a flow chart of a vehicle battery electrical protection method provided by the second embodiment of the present invention;

[0028] Figure 5 It is a structural diagram of an electronic device provided in Example 3 of the present invention. DETAILED DESCRIPTION

[0029] In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts should fall within the scope of protection of the present invention.

[0030] Example 1

[0031] Figure 1 This is a schematic diagram of the structure of a battery disconnect unit (BDU) protection system provided in the first embodiment of the present invention. This embodiment is applicable to the situation where multiple aspects of electrical protection are provided for vehicle batteries. Figure 1 As shown, the vehicle battery electrical protection system includes a liquid cooling circuit 1 and a water pump 2 for controlling the liquid cooling circuit 1 , a temperature sensor 3 , a current sensor 4 and a battery management system 5 .

[0032] Among them, the liquid cooling circuit is in contact with the battery module and the battery circuit breaker unit respectively. When the water pump is running, the coolant in the liquid cooling circuit passes through the battery module and the battery circuit breaker unit in turn.

[0033] A battery module is usually composed of multiple battery cells. When the battery module is in the charging and discharging state, heat is generated due to the loss of internal resistance of the battery and chemical reactions. When the temperature of the battery module is high, its performance is affected, so the battery module usually needs to dissipate heat. The battery circuit breaker unit usually includes relays, fuses, etc., which are important integrated components with functions such as controlling battery charging and discharging, protecting circuits, functional conversion and energy distribution. Its heat generation is greater than that of the battery module, so it also needs to be heat-dissipated. Liquid cooling plates can be provided in the battery module and the battery circuit breaker unit. The coolant in the liquid cooling circuit can contact the liquid cooling plates of the battery module and the battery circuit breaker unit to exchange heat with the liquid cooling plates, thereby dissipating heat from the battery module and the battery circuit breaker unit. Among them, the protection level of the liquid cooling plate is above IP67.

[0034] like Figure 1 As shown, the temperature sensor 3 is connected to the battery disconnect unit 6. The temperature sensor is used to collect the temperature of the battery disconnect unit. Specifically, the temperature sensor can collect the temperature of multiple heat-generating components in the battery disconnect unit. Figure 2 The figure shows the structure of the high-voltage circuit where the battery disconnect unit and the battery module are located. A battery disconnect unit 6 is provided between the power supply end of the high-voltage circuit and the battery module 5. The battery disconnect unit 6 includes a fuse 61, multiple relays 62, and a resistor 63. The battery disconnect unit 6 is used to protect the high-voltage circuit. Collection points can also be set on multiple heat-generating components in the battery disconnect unit 6 that are prone to heat generation, such as Figure 2 As shown, collection points N1, N2, N3, and N4 are set. It should be noted that when the temperature sensor collects multiple temperatures of multiple heat-generating components, the highest temperature among the multiple temperatures can be used as the temperature of the battery disconnect unit.

[0035] The heat generating components are generally components with a large internal resistance. The relays can be main positive relays, pre-charge relays, fast charge relays, and main negative relays, and can be arranged in the circuit according to functional requirements. This embodiment does not limit the type and number of relays.

[0036] The current sensor is used to detect the total current of the high voltage circuit where the battery disconnect unit is located, such as Figure 2 As shown, the current sensor 4 is arranged on the trunk line of the high-voltage circuit. Since the battery disconnect unit 6 is also arranged on the trunk line of the high-voltage circuit, the working current of the battery disconnect unit 6 is also the total current of the high-voltage circuit.

[0037] like Figure 1 As shown, the battery management system 5 is connected to the temperature sensor 3, the current sensor 4, and the water pump 5 respectively. The battery management system 5 can receive the temperature (data) of the battery circuit breaker unit 6 sent by the temperature sensor 3 and the total current sent by the current sensor 4, and can also control the operation of the water pump 2.

[0038] In this embodiment, the battery management system determines the speed of a water pump based on the temperature and total current of the battery disconnect unit, and controls the water pump to operate at the speed to drive coolant in the liquid cooling circuit to dissipate heat from the battery disconnect unit. The speed is positively correlated with the temperature and total current of the battery disconnect unit. A reference temperature is typically preset, and the temperature of the battery disconnect unit is compared with the reference temperature. When the temperature of the battery disconnect unit is greater than the reference temperature, it is determined that the battery disconnect unit temperature is too high, indicating that the battery disconnect unit requires heat dissipation. Furthermore, when the operating current of the battery disconnect unit is high, a large amount of heat is often generated. Therefore, the preset reference current and total current can also be used to determine whether the battery disconnect unit is in a heating state. When the battery management system determines that the battery disconnect unit temperature is too high or in a heating state, it can control the water pump to drive the coolant in the liquid cooling circuit to dissipate heat from the battery disconnect unit. Among them, the speed of the water pump is positively correlated with the temperature and total current of the battery circuit breaker unit. The faster the water pump speed, the faster the flow rate of the coolant in the liquid cooling circuit, the more heat the coolant can take away within a certain period of time, and the better the heat dissipation effect on the battery circuit breaker unit. It can avoid the battery circuit breaker unit from being too hot due to excessive temperature or excessive total current.

[0039] In this embodiment, the water inlet of the liquid cooling circuit is set at the end where the battery module is located, and the water outlet of the liquid cooling circuit is set at the end where the battery circuit breaker unit is located. When the water pump is running, the coolant in the liquid cooling circuit is driven to flow, and the coolant first passes through the battery module and then passes through the battery circuit breaker unit. That is, the battery module is first cooled and then the battery circuit breaker unit is cooled. Considering that the battery circuit breaker unit generates more heat than the battery module, if the battery circuit breaker unit is cooled first in the liquid cooling circuit, the temperature rise of the coolant passing through the battery circuit breaker unit may be large. When the coolant reaches the battery module, the temperature of the coolant may be close to or higher than the temperature of the battery module, making it difficult to play a heat dissipation role. Therefore, in this embodiment, the battery circuit breaker unit is set after the battery module to dissipate heat, which will not affect the heat dissipation of the battery module.

[0040] The vehicle battery electrical protection system of an embodiment of the present invention includes a liquid cooling circuit and a water pump, a temperature sensor, a current sensor and a battery management system for controlling the liquid cooling circuit. The liquid cooling circuit is in contact with the battery module and the battery circuit breaker unit respectively. When the water pump is running, the coolant in the liquid cooling circuit passes through the battery module and the battery circuit breaker unit in sequence; the temperature sensor is used to collect the temperature of the battery circuit breaker unit; the current sensor is used to detect the total current of the high-voltage circuit where the battery circuit breaker unit is located; the battery management system is connected to the temperature sensor, the current sensor and the water pump respectively, and is used to control the operation of the water pump according to the temperature and total current of the battery circuit breaker unit, so as to drive the coolant in the liquid cooling circuit to dissipate heat from the battery circuit breaker unit. On the one hand, when the total current of the high-voltage circuit where the battery disconnect unit is located is large, the battery disconnect unit is in a heating state due to the influence of internal resistance heat generation, that is, a large amount of heat may be generated. Therefore, this embodiment can determine whether the temperature of the battery disconnect unit is high or whether it is in a heating state by measuring the total current of the high-voltage circuit where the battery disconnect unit is located and the temperature of the battery disconnect unit. Furthermore, when it is confirmed that the temperature of the battery disconnect unit is high or in a heating state, the battery management system can control the operation of the water pump so that the coolant dissipates heat for the battery disconnect unit, thereby achieving heat dissipation protection for the battery disconnect unit and ensuring the safe and reliable operation of the electrical system. On the other hand, considering that the heat generated by the battery disconnect unit is greater than that of the battery module, the coolant in this embodiment first passes through the battery module and then passes through the battery disconnect unit. Therefore, while dissipating heat for the battery disconnect unit, it will not affect the heat dissipation of the battery module. In addition, the heat dissipation structure of the battery disconnect unit and the battery module is a series structure. Compared with the parallel structure, the series heat dissipation structure of this embodiment is not only simple in structure and dissipates heat quickly, but also has better fluidity.

[0041] In an optional embodiment of the present invention, the rotational speed includes a preset first speed, and the battery management system is further used to control the water pump to operate at a preset first speed when the temperature of the battery circuit breaker unit is within a preset cooling temperature range and / or the total current is greater than a preset reference current, so as to drive the coolant in the liquid cooling circuit to dissipate heat from the battery circuit breaker unit.

[0042] For example, the preset cooling temperature range is 85-105°C, and the preset reference current is 400A. When the temperature of the battery disconnect unit is within this temperature range, or the total current is greater than 400A, it is determined that the battery disconnect unit temperature is high or in a heating state and should be cooled. The water pump can then be controlled to operate at a preset first speed. When it is determined that the total current is greater than the preset reference current, the duration of the total current can also be calculated. If the total current is greater than the preset reference current and the duration exceeds the preset time, it indicates that a short circuit current exists, which can avoid misjudging the peak current.

[0043] In an optional embodiment of the present invention, the rotational speed further includes a preset second speed. The battery management system is further configured to, after controlling the water pump to operate at the preset first speed, determine whether the temperature of the battery disconnect unit is within a preset standard temperature range. When the temperature of the battery disconnect unit is within the preset standard temperature range, the rotational speed of the water pump is controlled to switch from the preset first speed to a preset second speed, where the preset second speed is less than the preset first speed. That is, in this embodiment, when the temperature of the battery disconnect unit is within the preset standard temperature range, the water pump can switch from high speed to low speed. This allows the water pump to control its rotational speed based on the temperature of the battery disconnect unit while meeting the cooling requirements of the battery disconnect unit, thereby reducing system energy consumption.

[0044] It should be noted that different preset first and second speeds represent different heat dissipation capabilities. The preset first speed represents the rotational speed when dissipating heat (cooling) the battery disconnect unit, and the preset second speed represents the rotational speed when the temperature of the battery disconnect unit is below the reference temperature and the battery disconnect unit is not in a heated state. When the temperature of the battery disconnect unit is below the reference temperature and the battery disconnect unit is not in a heated state, the battery management system can control the water pump to drive the liquid cooling circuit at the preset second speed to dissipate heat from the battery module and the battery disconnect unit.

[0045] In an optional embodiment of the present invention, the battery disconnect unit includes a fuse, and the battery management system is further connected to the fuse and the vehicle controller. The battery management system is further configured to generate a power reduction instruction based on the temperature of the battery disconnect unit when the temperature of the battery disconnect unit is within a preset insufficient cooling temperature range, and send it to the vehicle controller to reduce the charge and discharge power. When the battery disconnect unit is cooled by coolant in the liquid cooling circuit, and the temperature of the battery disconnect unit continues to rise to the insufficient cooling temperature range, it indicates that the coolant is insufficient to effectively dissipate heat from the battery disconnect unit. At this time, a power reduction instruction can be generated and sent to the vehicle controller. Upon receiving the instruction, the vehicle controller can control the vehicle's charge and discharge power to reduce the current in the high-voltage circuit. Accordingly, the operating current of the battery disconnect unit can be reduced, and the heat generated by the battery disconnect unit will also be reduced. For example, the insufficient cooling temperature range can be 105-130°C.

[0046] The battery management system is also configured to send a blow command to the fuse when the temperature of the battery disconnect unit is within a preset fault temperature range, causing the fuse to blow upon receiving the blow command, thereby disconnecting the high-voltage circuit. For example, the fault temperature range may be a temperature range above 130°C.

[0047] When the battery circuit breaker unit is cooled by the coolant of the liquid cooling circuit or the vehicle controller has been subjected to power reduction processing, and the temperature of the battery circuit breaker unit continues to rise to the fault temperature range, it means that the battery circuit breaker unit may have failed or the high-voltage circuit where the battery circuit breaker unit is located has a short circuit. At this time, the battery management system can send a melting instruction to the fuse so that the fuse melts when receiving the melting instruction to disconnect the high-voltage circuit. That is, the battery circuit breaker stops working to avoid serious consequences caused by continued temperature increase. Of course, the battery management system can also be connected to the relay in the battery circuit breaker unit. When the temperature of the battery circuit breaker unit is within the preset fault temperature range, the battery management system can also send a disconnection instruction to the relay to control the relay to disconnect. In addition, the battery management system can also send temperature fault information to the terminal where the staff is located.

[0048] In an optional embodiment of the present invention, based on the previous embodiment, the battery management system is also used to generate a power reduction instruction based on the temperature of the battery circuit breaker unit and send it to the vehicle controller, specifically including: the battery management system is also used to calculate the temperature difference between the temperature of the battery circuit breaker unit and a preset reference temperature; calculate the product of the temperature difference and the preset unit power as the power reduction amplitude; generate a power reduction instruction based on the power reduction amplitude and send it to the vehicle controller to reduce the charging and discharging power.

[0049] The reference temperature can be the minimum value of the preset insufficient cooling temperature range, and the unit power is the percentage of power reduction for every 1°C increase. For example, if the temperature difference is 3°C and the unit power is 5% / °C, the power reduction is 15%.

[0050] In an optional embodiment of the present invention, a fuse is provided in the battery disconnect unit, and the battery management system is connected to the fuse and the vehicle controller of the vehicle respectively. The battery management system is also used to send a fuse instruction to the fuse when receiving a collision signal, so that the fuse melts when receiving the fuse instruction to disconnect the high-voltage circuit, wherein the collision signal is sent to the battery management system by the vehicle controller when the airbag of the vehicle is triggered. When the vehicle collides and the collision intensity reaches the triggering condition of the car airbag, the vehicle controller sends a collision signal to the battery management system. The battery management system receives the collision signal and sends a fuse instruction to the fuse. At this time, the new active and passive integrated fuse triggers the active cut-off function, cutting off the high-voltage circuit, which can avoid the battery continuing to charge and discharge after the vehicle collision and causing safety hazards, thereby improving the safety of the vehicle. Among them, the battery management system can also provide a trigger power supply for the fuse to trigger the fuse to melt.

[0051] In an optional embodiment of the present invention, a battery disconnect unit is provided with a fuse and a relay. The fuse is connected to a battery management system. The battery management system is further configured to send a blow command to the fuse when the total current exceeds the withstand current of the relay but is less than the withstand current of the fuse. Upon receiving the blow command, the fuse blows, thereby disconnecting the high-voltage circuit. The withstand current of the relay can be determined based on actual needs and / or the rated withstand current of the relay.

[0052] Among them, the withstand current of the relay is smaller than the withstand current of the fuse. Figure 3 As shown in the figure, I0 represents the withstand current of the relay, I1 represents the withstand current of the fuse, curve A represents the current withstand curve of the fuse, curve B represents the current withstand curve of the relay, and curve C represents the current withstand curve of the battery cell in the battery module. That is, when a short circuit occurs in the high-voltage circuit and the short-circuit current is greater than the withstand current I1 of the fuse, the fuse can be quickly melted by the current thermal accumulation effect to disconnect the high-voltage circuit. When a short circuit occurs in the high-voltage circuit and the short-circuit current is in the I0-I1 range, the short-circuit current does not reach the withstand current I1 of the fuse, and the fuse cannot be quickly melted by the current thermal accumulation effect, thereby disconnecting the high-voltage circuit. Figure 3 It can be seen that at this time, the withstand time of the relay and the battery cell is shorter than the withstand time of the fuse, so the relay and the battery cell may be damaged before the fuse blows.

[0053] Therefore, in this embodiment, when the total current is greater than the withstand current of the relay, it can be determined that a short circuit occurs in the high-voltage circuit. When the total current is greater than the withstand current of the relay and less than the withstand current of the fuse, a melting instruction is sent to the fuse to control the fuse to melt, disconnecting the high-voltage circuit to protect the relay and battery cell. At this time, the short-circuit current is small and not enough to cause damage to other electrical components, so it can be controlled by the battery management system. When encountering a relatively large short-circuit current, for example, a short-circuit current of more than 6000A, if the fuse needs to be processed by the battery management system's logic judgment before it can cut off the current, the cut-off time may take tens of milliseconds. At this time, the short-circuit current is too large, and other electrical components may not be able to withstand it and be damaged in a few milliseconds. Therefore, when the total current is greater than the fuse's tolerance current, the fuse can automatically blow according to the current thermal accumulation effect. There is no need to judge the current size through the battery management system, but to respond and blow immediately to avoid damage to other electrical components caused by large current. In this embodiment, the high-voltage circuit is protected by actively controlling the fuse blowing and combining the passive blowing of the fuse due to thermal accumulation, which broadens the short-circuit protection range of the battery circuit breaker unit for the high-voltage circuit and ensures the safety of the relay and battery cell.

[0054] Among them, when the total current is greater than the withstand current of the relay, the duration of the short-circuit current can be calculated. If the short-circuit current lasts for a period of time, it can be determined that a short circuit has occurred, avoiding misjudgment due to peak current.

[0055] In an optional embodiment of the present invention, the battery management system can also collect the total positive voltage of the high-voltage circuit (such as Figure 2 The insulation resistance between the power supply terminal V+) and the grounding point of the battery module is used to judge the high-voltage insulation condition. When the insulation resistance is lower than the insulation resistance threshold, a high-voltage lowering command is sent to the vehicle controller.

[0056] In an optional embodiment of the present invention, multiple high-voltage data collection points are set up in the high-voltage circuit. The collected voltage values ​​are used to determine whether the fuse in the battery disconnect unit is open and whether the relay is stuck. If so, a power-off command can be sent to the vehicle controller.

[0057] Example 2

[0058] Figure 4 This is a flow chart of a vehicle battery electrical protection method provided in the second embodiment of the present invention. This embodiment is applicable to situations where multiple aspects of electrical protection are performed on vehicle batteries. This method can be applied to the vehicle battery electrical protection system shown in the first embodiment. The vehicle battery electrical protection system includes a liquid cooling circuit and a water pump for controlling the liquid cooling circuit. The liquid cooling circuit is in contact with the battery module and the battery disconnect unit respectively. When the water pump is running, the coolant in the liquid cooling circuit passes through the battery module and the battery disconnect unit in sequence. Figure 4 As shown, the vehicle battery electrical protection method includes:

[0059] S401, collecting the temperature of the battery disconnect unit;

[0060] S402, detecting the total current of the high-voltage circuit where the battery disconnect unit is located;

[0061] S403 , determining a rotation speed of the water pump according to the temperature and total current of the battery disconnect unit, and controlling the water pump to operate at the rotation speed to drive the coolant in the liquid cooling circuit to dissipate heat from the battery disconnect unit.

[0062] The rotation speed is positively correlated with the temperature and total current of the battery disconnect unit.

[0063] In an optional embodiment of the present invention, the rotation speed includes a preset first speed, and S403 includes:

[0064] When the temperature of the battery circuit breaker unit is within a preset cooling temperature range, and / or the total current is greater than a preset reference current, the water pump is controlled to operate at a preset first speed to drive the coolant in the liquid cooling circuit to dissipate heat from the battery circuit breaker unit.

[0065] In an optional embodiment of the present invention, the rotation speed further includes a preset second speed. After controlling the water pump to operate at the preset first speed, the method further includes:

[0066] Determine whether the temperature of the battery disconnect unit is within a preset standard temperature range;

[0067] When the temperature of the battery disconnect unit is within a preset standard temperature range, the rotation speed of the water pump is controlled to switch from a preset first speed to a preset second speed, and the preset second speed is lower than the preset first speed.

[0068] In an optional embodiment of the present invention, a fuse is provided in the battery disconnect unit, and the vehicle battery electrical protection method further includes:

[0069] When the temperature of the battery disconnect unit is within the preset insufficient cooling temperature range, a power reduction instruction is generated according to the temperature of the battery disconnect unit and sent to the vehicle controller to reduce the charging and discharging power;

[0070] When the temperature of the battery circuit breaker unit is within a preset fault temperature range, a fusing instruction is sent to the fuse, so that the fuse is blown upon receiving the fusing instruction to disconnect the high-voltage circuit.

[0071] In an optional embodiment of the present invention, generating a power reduction instruction based on the temperature of the battery disconnect unit and sending it to the vehicle controller to reduce the charging and discharging power includes:

[0072] Calculating the temperature difference between the temperature of the battery disconnect unit and a preset reference temperature;

[0073] Calculate the product of the temperature difference and the preset unit power as the power reduction amplitude;

[0074] A power reduction instruction is generated according to the power reduction amplitude and sent to the vehicle controller.

[0075] In an optional embodiment of the present invention, a fuse is provided in the battery disconnect unit, and the vehicle battery electrical protection method further includes:

[0076] When a collision signal is received, a melting instruction is sent to the fuse so that the fuse melts when the melting instruction is received to disconnect the high-voltage circuit, wherein the collision signal is sent by the vehicle controller to the battery management system when the airbag of the vehicle is triggered.

[0077] In an optional embodiment of the present invention, a fuse and a relay are provided in the battery disconnect unit, and the vehicle battery electrical protection method further includes:

[0078] When the total current is greater than the withstand current of the relay and less than the withstand current of the fuse, a fusing instruction is sent to the fuse so that the fuse is blown upon receiving the fusing instruction to disconnect the high-voltage circuit.

[0079] The vehicle battery electrical protection method of this embodiment can be applied to the vehicle battery electrical protection system provided in Example 1, thereby enabling the vehicle battery electrical protection system to achieve corresponding beneficial effects. It should be noted that the method embodiment is generally similar to the system embodiment, so the description is relatively simple. For relevant details, please refer to the description of the system embodiment.

[0080] Example 3

[0081] Figure 5 A schematic diagram of the structure of an electronic device 70 that can be used to implement an embodiment of the present invention is shown. The electronic device is intended to represent various forms of digital computers, such as laptop computers, desktop computers, workstations, personal digital assistants, servers, blade servers, mainframe computers, and other suitable computers. The electronic device can also represent various forms of mobile devices, such as personal digital processing, cellular phones, smart phones, wearable devices (such as helmets, glasses, watches, etc.) and other similar computing devices. The components shown herein, their connections and relationships, and their functions are merely examples and are not intended to limit the implementation of the present invention described and / or claimed herein.

[0082] like Figure 5 As shown, the electronic device 70 includes at least one processor 71 and a memory connected to the at least one processor 71, such as a read-only memory (ROM) 72, a random access memory (RAM) 73, etc., wherein the memory stores a computer program that can be executed by the at least one processor, and the processor 71 can perform various appropriate actions and processes according to the computer program stored in the read-only memory (ROM) 72 or the computer program loaded from the storage unit 78 to the random access memory (RAM) 73. Various programs and data required for the operation of the electronic device 70 can also be stored in the RAM 73. The processor 71, ROM 72 and RAM 73 are connected to each other via a bus 74. An input / output (I / O) interface 75 is also connected to the bus 74.

[0083] Multiple components in the electronic device 70 are connected to the I / O interface 75, including an input unit 76, such as a keyboard, a mouse, etc.; an output unit 77, such as various types of displays, speakers, etc.; a storage unit 78, such as a magnetic disk, an optical disk, etc.; and a communication unit 79, such as a network card, a modem, a wireless communication transceiver, etc. The communication unit 79 allows the electronic device 70 to exchange information / data with other devices via a computer network such as the Internet and / or various telecommunication networks.

[0084] The processor 71 can be any general-purpose and / or specialized processing component with processing and computing capabilities. Some examples of the processor 71 include, but are not limited to, a central processing unit (CPU), a graphics processing unit (GPU), various specialized artificial intelligence (AI) computing chips, various processors running machine learning model algorithms, a digital signal processor (DSP), and any appropriate processor, controller, microcontroller, etc. The processor 71 executes the various methods and processes described above, such as the vehicle battery electrical protection method.

[0085] In some embodiments, the vehicle battery electrical protection method can be implemented as a computer program that is tangibly contained in a computer-readable storage medium, such as a storage unit 78. In some embodiments, part or all of the computer program can be loaded and / or installed on the electronic device 70 via the ROM 72 and / or the communication unit 79. When the computer program is loaded into the RAM 73 and executed by the processor 71, one or more steps of the vehicle battery electrical protection method described above can be performed. Alternatively, in other embodiments, the processor 71 can be configured to execute the vehicle battery electrical protection method in any other appropriate manner (e.g., by means of firmware).

[0086] Various embodiments of the systems and techniques described herein can be implemented in digital electronic circuit systems, integrated circuit systems, field programmable gate arrays (FPGAs), application specific integrated circuits (ASICs), application specific standard products (ASSPs), system-on-chip systems (SOCs), programmable logic devices (CPLDs), computer hardware, firmware, software, and / or combinations thereof. These various embodiments can include being implemented in one or more computer programs that are executable and / or interpreted on a programmable system that includes at least one programmable processor, which can be a special purpose or general purpose programmable processor that can receive data and instructions from a storage system, at least one input device, and at least one output device, and transmit data and instructions to the storage system, the at least one input device, and the at least one output device.

[0087] Computer programs for implementing the methods of the present invention may be written in any combination of one or more programming languages. These computer programs may be provided to a processor of a general-purpose computer, a special-purpose computer, or other programmable data processing device, such that when the computer program is executed by the processor, the functions / operations specified in the flowcharts and / or block diagrams are implemented. The computer program may be executed entirely on the machine, partially on the machine, as a stand-alone software package, partially on the machine and partially on a remote machine, or entirely on a remote machine or server.

[0088] In the context of the present invention, computer-readable storage media can be tangible media that can contain or store a computer program for use with an instruction execution system, device or equipment or used in combination with an instruction execution system, device or equipment. Computer-readable storage media can include but are not limited to electronic, magnetic, optical, electromagnetic, infrared or semiconductor systems, devices or equipment, or any suitable combination of the foregoing. Alternatively, computer-readable storage media can be machine-readable signal media. More specific examples of machine-readable storage media can include electrical connections based on one or more lines, portable computer disks, hard disks, random access memories (RAM), read-only memories (ROM), erasable programmable read-only memories (EPROM or flash memory), optical fibers, portable compact disk read-only memories (CD-ROM), optical storage devices, magnetic storage devices, or any suitable combination of the foregoing.

[0089] To provide interaction with a user, the systems and techniques described herein can be implemented on an electronic device having: a display device (e.g., a CRT (cathode ray tube) or LCD (liquid crystal display) monitor) for displaying information to the user; and a keyboard and pointing device (e.g., a mouse or trackball) through which the user can provide input to the electronic device. Other types of devices can also be used to provide interaction with the user; for example, the feedback provided to the user can be any form of sensory feedback (e.g., visual feedback, auditory feedback, or tactile feedback); and input from the user can be received in any form (including acoustic input, voice input, or tactile input).

[0090] The systems and techniques described herein can be implemented in a computing system that includes back-end components (e.g., as a data server), or a computing system that includes middleware components (e.g., an application server), or a computing system that includes front-end components (e.g., a user computer with a graphical user interface or web browser through which a user can interact with implementations of the systems and techniques described herein), or a computing system that includes any combination of such back-end components, middleware components, or front-end components. The components of the system can be interconnected by any form or medium of digital data communication (e.g., a communication network). Examples of communication networks include: a local area network (LAN), a wide area network (WAN), a blockchain network, and the Internet.

[0091] A computing system may include clients and servers. The clients and servers are typically remote from each other and typically interact via a communication network. This client-server relationship arises through computer programs running on the respective computers, creating a client-server relationship. The server may be a cloud server, also known as a cloud computing server or cloud host. This server is a hosting product within the cloud computing service ecosystem that addresses the management difficulties and limited scalability of traditional physical hosting and VPS services.

[0092] It should be understood that the various forms of the processes shown above can be used to reorder, add, or delete steps. For example, the steps described in the present invention can be performed in parallel, sequentially, or in a different order, as long as the desired results of the technical solution of the present invention can be achieved. This is not limited herein.

[0093] The above specific embodiments do not limit the scope of protection of the present invention. Those skilled in the art will appreciate that various modifications, combinations, sub-combinations, and substitutions may be made based on design requirements and other factors. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention are intended to be included within the scope of protection of the present invention.

Claims

1. A vehicle battery electrical protection system, characterized in that: include: a liquid cooling circuit and a water pump for controlling the liquid cooling circuit, wherein the liquid cooling circuit contacts the battery module and the battery disconnect unit respectively. When the water pump is in operation, the coolant in the liquid cooling circuit passes through the battery module and the battery disconnect unit in sequence. The heat generated by the battery disconnect unit is greater than the heat generated by the battery module. a temperature sensor, configured to collect the temperature of the battery disconnect unit; A current sensor, used to detect the total current of the high-voltage circuit where the battery disconnect unit is located; a battery management system, the battery management system being connected to the temperature sensor, the current sensor, and the water pump, respectively, and being configured to determine a rotational speed of the water pump based on the temperature of the battery disconnect unit and the total current, and to control the water pump to operate at the rotational speed to drive the coolant in the liquid cooling circuit to dissipate heat from the battery disconnect unit, wherein the rotational speed is positively correlated with the temperature of the battery disconnect unit and the total current; The rotation speed includes a preset first speed, and the battery management system is further configured to: When the temperature of the battery disconnect unit is within a preset cooling temperature range and / or the total current is greater than a preset reference current, controlling the water pump to operate at a preset first speed to drive the coolant in the liquid cooling circuit to dissipate heat from the battery disconnect unit; The rotation speed further includes a preset second speed, and the battery management system is further configured to: After controlling the water pump to operate at a preset first speed, determining whether the temperature of the battery disconnect unit is within a preset standard temperature range; When the temperature of the battery disconnect unit is within a preset standard temperature range, the rotation speed of the water pump is controlled to switch from a preset first speed to a preset second speed, where the preset second speed is lower than the preset first speed.

2. The vehicle battery electrical protection system according to claim 1, characterized in that: The battery disconnect unit is provided with a fuse, and the battery management system is also connected to the fuse and the vehicle controller respectively. The battery management system is also used to: When the temperature of the battery disconnect unit is within a preset insufficient cooling temperature range, a power reduction instruction is generated according to the temperature of the battery disconnect unit and sent to the vehicle controller to reduce the charging and discharging power; When the temperature of the battery circuit breaker unit is within a preset fault temperature range, a fusing instruction is sent to the fuse, so that the fuse is blown upon receiving the fusing instruction to disconnect the high-voltage circuit.

3. The vehicle battery electrical protection system according to claim 2, wherein: When the battery management system is used to generate a power reduction instruction according to the temperature of the battery disconnect unit and send it to the vehicle controller, it specifically includes: The battery management system is used to calculate the temperature difference between the temperature of the battery disconnect unit and a preset reference temperature; Calculating the product of the temperature difference and the preset unit power as the power reduction amplitude; A power reduction instruction is generated according to the power reduction amplitude and sent to the vehicle controller.

4. The vehicle battery electrical protection system according to claim 1, wherein: The battery disconnect unit is provided with a fuse, and the battery management system is connected to the fuse and the vehicle controller respectively; The battery management system is also used to send a melting instruction to the fuse when a collision signal is received, so that the fuse melts when the melting instruction is received to disconnect the high-voltage circuit, wherein the collision signal is sent to the battery management system by the vehicle controller when the airbag of the vehicle is triggered.

5. The vehicle battery electrical protection system according to claim 1, wherein: The battery disconnect unit is provided with a fuse and a relay, and the fuse is connected to the battery management system. The battery management system is also used to send a melting instruction to the fuse when the total current is greater than the withstand current of the relay and less than the withstand current of the fuse; so that the fuse melts upon receiving the melting instruction to disconnect the high-voltage circuit.

6. A vehicle battery electrical protection method, characterized in that: The method is applied to a vehicle battery electrical protection system, the vehicle battery electrical protection system including a liquid cooling circuit and a water pump for controlling the liquid cooling circuit, the liquid cooling circuit being in contact with a battery module and a battery disconnect unit respectively. When the water pump is running, the coolant in the liquid cooling circuit passes through the battery module and the battery disconnect unit in sequence. The heat generated by the battery disconnect unit is greater than the heat generated by the battery module. collecting the temperature of the battery disconnect unit; Detecting the total current of the high-voltage circuit where the battery disconnect unit is located; determining a rotational speed of the water pump according to the temperature of the battery disconnect unit and the total current, and controlling the water pump to operate at the rotational speed to drive coolant in the liquid cooling circuit to dissipate heat from the battery disconnect unit, wherein the rotational speed is positively correlated with the temperature of the battery disconnect unit and the total current; The rotational speed includes a preset first speed and a preset second speed, the preset second speed being less than the preset first speed, determining the rotational speed of the water pump according to the temperature of the battery disconnect unit and the total current, and controlling the water pump to operate at the rotational speed to drive the coolant in the liquid cooling circuit to dissipate heat from the battery disconnect unit, comprising: When the temperature of the battery disconnect unit is within a preset cooling temperature range, and / or the total current is greater than a preset reference current, controlling the water pump to operate at a preset first speed to drive the coolant in the liquid cooling circuit to dissipate heat from the battery disconnect unit; After controlling the water pump to operate at a preset first speed, determining whether the temperature of the battery disconnect unit is within a preset standard temperature range; When the temperature of the battery disconnect unit is within a preset standard temperature range, the rotation speed of the water pump is controlled to switch from a preset first speed to a preset second speed.

7. An electronic device, characterized in that: The electronic device comprises: at least one processor; and a memory communicatively connected to the at least one processor; wherein, The memory stores a computer program executable by the at least one processor, and the computer program is executed by the at least one processor to enable the at least one processor to perform the vehicle battery electrical protection method according to claim 6.

8. A computer-readable storage medium, characterized in that The computer-readable storage medium stores computer instructions, which are used to enable a processor to implement the vehicle battery electrical protection method according to claim 6 when executed.

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