High-voltage power distribution control system and high-voltage power distribution control method

Abstract

The application provides a high-voltage power distribution control system and a high-voltage power distribution control method. The high-voltage power distribution control system comprises: a battery pack circuit breaking unit, comprising a relay, a fuse, a current sensor and a cooling circuit, wherein the current sensor is used for detecting the current of a battery module; a temperature detection unit, used for detecting the temperature of a cooling liquid in the cooling circuit and the temperature of an electric connection point of the relay, the fuse and the sensor; and a battery controller, connected with the temperature detection unit and the current sensor, and used for controlling the relay circuit, the high-voltage circuit and the cooling circuit. The technical scheme of the application can determine whether the high-voltage circuit is abnormal by comprehensively considering the temperature of the cooling liquid, the current and the temperature of the electric connection point of each component, so as to ensure the safety of the high-voltage circuit.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of high-voltage power distribution, in particular to a high-voltage power distribution control system and a high-voltage power distribution control method. BACKGROUND

[0002] In the prior art, the high-voltage power distribution system has the risk of insufficient current-carrying capacity of components. When the temperature of the internal components of the existing high-voltage power distribution box rises, the abnormality of the components in the high-voltage power distribution system cannot be accurately detected and corresponding measures cannot be taken, resulting in safety hazards of the high-voltage power distribution system. SUMMARY

[0003] The main purpose of the present application is to provide a high-voltage power distribution control system and a high-voltage power distribution control method to determine whether the high-voltage circuit is abnormal by comprehensively considering the temperature of the cooling liquid, the current and the temperature of the electrical connection points of each component, thereby ensuring the safety of the high-voltage circuit.

[0004] In order to achieve the above-mentioned purpose, according to one aspect of the present application, a high-voltage power distribution control system is provided, comprising: a battery pack circuit breaking unit comprising a relay, a fuse, a current sensor and a cooling circuit, the current sensor being used to detect the current of a battery module; a temperature detection unit used to detect the temperature of the cooling liquid in the cooling circuit and the electrical connection point temperature of the relay, the fuse and the sensor; a battery controller connected to the temperature detection unit and the current sensor, the battery controller being used to control the relay circuit, the high-voltage circuit and the cooling circuit.

[0005] According to another aspect of the present application, a high-voltage power distribution control method is provided, which is controlled by the above-mentioned high-voltage power distribution control system, and the high-voltage power distribution control method comprises: detecting the temperature of the cooling liquid in the cooling circuit of the battery pack circuit breaking unit; obtaining the current of the battery module; obtaining the electrical connection point temperature of the components in the battery pack circuit breaking unit, the components including at least one of the relay, the fuse and the current sensor; and controlling the relay circuit, the high-voltage circuit and the cooling circuit according to the temperature of the cooling liquid, the current and the electrical connection point temperature of the components.

[0006] Further, the high-voltage power distribution control method further comprises judging whether the electrical connection point temperatures at different positions on the components are both greater than a first threshold value, and if so, performing a first judgment step; and if not, repeating the step of obtaining the electrical connection point temperature of the components in the battery pack circuit breaking unit, wherein the components include at least one of the relay, the fuse and the current sensor.

[0007] Further, the first judgment step comprises judging whether the difference between the two electrical connection point temperatures is greater than or equal to A℃, and when the two electrical connection point temperatures on the components are both greater than the first threshold value, the high-voltage power distribution control method further comprises a step of detecting whether the temperature and flow of the cooling liquid are normal.

[0008] Further, the precondition for detecting whether the coolant temperature and flow are normal is that the difference between the temperatures of the two electrical connection points of any one of the relay, the fuse and the current sensor is greater than or equal to A℃; when at least one of the coolant temperature and flow is abnormal, the step of increasing the flow of the coolant in the cooling circuit is performed, and the step of obtaining the temperature of the electrical connection point of each component is repeatedly performed.

[0009] Further, when the coolant temperature is between -40℃ and 40℃, the coolant flow is between 5 and 15 L / min, and the temperature of the two electrical connection points of at least one of the relay, the fuse and the sensor is greater than the first threshold value, the battery management system is reported and the step of reducing the current in the circuit is performed.

[0010] Further, after the step of reducing the current in the circuit, the high-voltage power distribution control method further comprises: determining whether the temperature of the two electrical connection points of at least one of the relay, the fuse and the sensor is greater than the second threshold value, and if so, performing the step of cutting off the relay circuit, wherein the second threshold value is greater than the first threshold value.

[0011] Further, when the difference between the temperatures of the two electrical connection points at different positions on one of the relay, the fuse and the sensor is greater than or equal to A℃, it is considered that the sampling sensor has failed or that the electrical connection of the component is abnormal; when the difference between the temperatures of the two electrical connection points at different positions on at least two of the relay, the fuse and the sensor is greater than or equal to A℃, it is considered that the temperature rise is abnormal.

[0012] Further, after the step of cutting off the relay circuit, the high-voltage power distribution control method further comprises the step of detecting whether the current in the battery module circuit is greater than a preset value, and if so, activating the fuse.

[0013] Further, the high-voltage power distribution control method further comprises the step of storing the fault code formed by the temperature rise abnormality, the sampling sensor abnormality and the electrical connection abnormality of the component.

[0014] The high-voltage power distribution control system adopts a water-cooled form, and through the cooling circuit, the effect of cooling the components and the battery module in the battery pack circuit breaking unit can be achieved, so that the problem of temperature being too high due to insufficient current-carrying capacity of the components in the high-voltage power distribution control system can be avoided; the temperature detection unit includes a plurality of temperature detection pieces, and the plurality of temperature detection pieces can detect the temperature of the cooling liquid, the temperature of the relay electrical connection point, the temperature of the fuse electrical connection point and the temperature of the sensor electrical connection point, wherein the relay electrical connection point, the fuse electrical connection point and the sensor electrical connection point are each provided with two temperature detection pieces, so that when one of the sampling sensors for detecting temperature fails, the inaccurate temperature detection result can be avoided. The battery controller can comprehensively judge whether the high-voltage circuit is abnormal and which abnormality occurs according to the temperature detected by the temperature detection unit and the current detected by the current sensor, and the battery controller can control the excitation fuse to cut off the relay circuit, so as to ensure the safety of the relay circuit. BRIEF DESCRIPTION OF DRAWINGS

[0015] The accompanying drawings, which form a part of the specification, are included to provide a further understanding of the application and are incorporated herein by reference. The embodiments of the present application, together with its

[0016] Figure 1 a topological principle diagram of an embodiment of the high-voltage power distribution control system according to the present application is shown;

[0017] Figure 2 a structure diagram of a battery pack circuit breaking unit of the high-voltage power distribution control system according to the present application is shown; Figure 1

[0018] Figure 3 a logic diagram of an embodiment of the high-voltage power distribution control method according to the present application is shown; and

[0019] Figure 4 a flow chart of an embodiment of the high-voltage power distribution control method according to the present application is shown. Figure 3

[0020] In the above drawings, the following reference signs are used:

[0021] 1, BDU main body; 2, cooling circuit; 3, battery module; 4, fuse; 5, battery management system (BMS); 6, vehicle controller. DETAILED DESCRIPTION

[0022] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments. ​​

[0023] As Figure 1 and Figure 2 Embodiments of the present application provide a high-voltage power distribution control system. The high-voltage power distribution control system comprises a battery pack circuit breaking unit, a temperature detection unit and a battery controller, wherein the battery pack circuit breaking unit comprises a relay, a fuse, a current sensor for detecting the current of a battery module 3, and a cooling circuit 2; the temperature detection unit is used to detect the temperature of the cooling liquid in the cooling circuit 2 and the temperature of the electrical connection points of the relay, the fuse 4 and the sensor; the battery controller is connected with the temperature detection unit and the current sensor, and is used to control the relay circuit, the high-voltage circuit and the cooling circuit 2.

[0024] Specifically, the battery pack circuit breaking unit comprises a BDU main body 1 and a cooling circuit 2 for cooling the BDU main body 1 and the battery module 3. The temperature detection unit can be integrated into a battery management system 5 connected with a vehicle controller 6.

[0025] In the above technical solution, the high-voltage power distribution control system adopts a water-cooling form, and through the setting of the cooling circuit, the cooling effect of the components in the battery pack circuit breaking unit and the battery module can be realized at the same time, so that the problem of temperature overhigh of the components in the high-voltage power distribution control system due to insufficient current-carrying capacity can be avoided; the temperature detection unit comprises a plurality of temperature detection elements, which can respectively detect the temperature of the cooling liquid, the temperature of the electrical connection points of the relay, the temperature of the electrical connection points of the fuse and the temperature of the electrical connection points of the sensor, wherein two temperature detection elements are arranged for each of the electrical connection points of the relay, the fuse and the sensor, so that when one of the sampling sensors for detecting the temperature fails, the inaccuracy of the temperature detection result can be avoided. In addition, since each component (relay, fuse and current sensor) is equipped with a temperature detection element, the electrical connection point temperature of each component can be detected in real time.

[0026] Through the above setting, the battery controller can comprehensively judge whether the components (such as the relay, the fuse, etc.) in the high-voltage circuit have the risk of over-temperature according to the temperature detected by the temperature detection unit and the current detected by the current sensor, and comprehensively determine the abnormality of the components or the electrical connection, so as to effectively ensure the safety of the high-voltage circuit.

[0027] As Figure 3 and Figure 4 Embodiments of the present application also provide a high-voltage power distribution control method, which is controlled by the high-voltage power distribution control system described above, and comprises the following steps:

[0028] detecting the temperature of the cooling liquid in the cooling circuit of the battery pack circuit breaking unit;

[0029] Obtaining the current of the battery module;

[0030] Obtaining the temperature of the electrical connection points of the components in the battery pack circuit breaking unit, the components including a relay, a fuse and a current sensor; controlling the relay loop, the high-voltage loop and the cooling loop according to the temperature of the cooling liquid, the current and the temperature of the electrical connection points of the components.

[0031] In the above technical solution, the temperature detection unit in the high-voltage power distribution control system can detect the temperature of the cooling liquid in the cooling loop and obtain the temperature of the electrical connection points of the components in the battery pack circuit breaking unit; the current sensor in the high-voltage power distribution control system can obtain the current of the battery module.

[0032] Through the above arrangement, the high-voltage power distribution control method can comprehensively judge whether the components on the high-voltage loop are at risk of over-temperature by comprehensively judging the temperature of the cooling liquid, the current of the battery module and the temperature of the electrical connection points of the components (the relay, the fuse and the sensor), so as to cut off the relay loop when the temperature is abnormal, thereby ensuring the safety of the relay loop.

[0033] For example, the temperature of the cooling liquid is set to -40℃-60℃, the current of the battery module is set to -500A-1500A, the upper limit of the temperature of the current sensor is set to 110℃, and the upper limit of the temperature of the relay and the fuse is set to 150℃, so that when the temperature of the cooling liquid is <60℃, the current is continuously <500A, the actual temperature of the current sensor is >110℃, and the temperature of the relay and the fuse is >150℃, it is determined that an abnormality occurs, and the relay loop needs to be controlled to be cut off to ensure the safety of the relay loop.

[0034] In the present application and the embodiments of the present application, as shown in Figure 2 There are two sampling points on the relay, the fuse and the current sensor, wherein two electrical connection points are arranged on the relay, such as relay temperature detection point 2-1 and relay temperature detection point 2-2; two electrical connection points are arranged on the fuse, including fuse temperature detection point 3-1 and fuse temperature detection point 3-2; and two electrical connection points are arranged on the current sensor, including sensor temperature detection point 4-1 and sensor temperature detection point 4-2. In this way, the temperatures of the two electrical connection points on different components can be detected respectively, which facilitates the subsequent control method.

[0035] As shown in Figure 4 In the embodiments of the present application, the high-voltage power distribution control method further includes judging whether the temperatures of the two electrical connection points at different positions on the components are both greater than a first threshold value, and if so, performing the first judging step; if not, repeating the step of obtaining the temperature of the electrical connection points of the components in the battery pack circuit breaking unit, wherein the components include at least one of a relay, a fuse and a current sensor.

[0036] It should be noted that the components refer to the relays, fuses and current sensors in the battery pack circuit breaking unit, and the plurality of components perform the above-mentioned judgment steps at the same time. The above means that the high-voltage power distribution control method comprises:

[0037] S10: judging whether the temperatures of two electrical connection points at different positions on the relay are both greater than a first threshold value (i.e. the relay first threshold value), if yes, performing the relay judgment step, if no, repeating the step of obtaining the temperature of the electrical connection point on the relay;

[0038] S20: judging whether the temperatures of two electrical connection points at different positions on the fuse are both greater than a first threshold value (i.e. the fuse first threshold value), if yes, performing the fuse judgment step, if no, repeating the step of obtaining the temperature of the electrical connection point on the fuse;

[0039] S30: judging whether the temperatures of two electrical connection points at different positions on the current sensor are both greater than a first threshold value (i.e. the current sensor first threshold value), if yes, performing the current sensor judgment step, if no, repeating the step of obtaining the temperature of the electrical connection point on the current sensor;

[0040] The above-mentioned three steps S10, S20 and S30 are performed in parallel and have no sequence relationship with each other.

[0041] It should be noted that each component has a corresponding first threshold value, and the sizes of the first threshold values corresponding to the components are different.

[0042] In the above technical solution, when at least one of the temperatures of the two electrical connection points of the component is less than or equal to the first threshold value, the temperature of the electrical connection point of the component is not abnormal, at this time, only the step of obtaining the temperature of the electrical connection point of the component in the battery pack circuit breaking unit needs to be repeated; when the temperatures of the two electrical connection points of the component are both greater than the first threshold value, the temperature of the electrical connection point of the component is abnormal, and the first judgment step is performed.

[0043] As shown in FIG. Figure 4 In the embodiment of the present application, when the temperatures of the two electrical connection points on the component are both greater than the first threshold value, the first judgment step comprises judging whether the difference between the temperatures of the two electrical connection points is greater than or equal to A℃, if yes, performing the step of detecting whether the temperature and flow of the cooling liquid are normal.

[0044] In the above technical solution, when the temperature difference between the two electrical connection points of a component is greater than or equal to A℃, that is, when the temperature of both electrical connection points of the component exceeds the first threshold and the temperature difference between the two electrical connection points is large, it indicates that the electrical connection point of the component is abnormal. In order to further determine the cause of the abnormality and take corresponding protective measures, the high-voltage power distribution control method performs the step of detecting whether the coolant temperature and flow rate are normal.

[0045] Optionally, A℃ is greater than 4℃ and less than or equal to 7℃.

[0046] Preferably, A℃ is 5℃.

[0047] It should be noted that in the above technical solution, multiple components perform the above judgment steps respectively. That is, when the temperature difference between the two electrical connection points of any one of the relay, fuse and current sensor is greater than or equal to A℃, it is necessary to perform the step of checking whether the coolant temperature and flow rate are normal.

[0048] like Figure 4 As shown, in an embodiment of the present invention, when at least one of the coolant temperature and flow rate is abnormal, the step of increasing the coolant flow rate in the cooling circuit is performed, and the step of obtaining the temperature of the electrical connection points of each component is repeated.

[0049] It should be noted that a coolant temperature greater than -40℃ and less than 40℃ is considered normal, and a coolant flow rate greater than 5L / min and less than 15L / min is considered normal.

[0050] Preferably, the coolant flow rate is 10 L / min.

[0051] In the above technical solution, when the temperature difference between two electrical connection points of a certain component (such as a relay, fuse, or current sensor) is less than A℃, and the coolant temperature and flow rate are abnormal (i.e., the coolant temperature is less than -40℃ or greater than 40℃, or the coolant flow rate is less than 5L / min or greater than 15L / min), that is, when the temperature of both electrical connection points of the component exceeds the first threshold but the temperatures of the two electrical connection points are similar, it indicates that the coolant is abnormal, causing the component temperature to be too high. At this time, it is only necessary to increase the coolant flow rate in the cooling circuit to cool the component, thereby achieving the effect of ensuring the safety of the relay circuit.

[0052] like Figure 4 As shown, in an embodiment of the present invention, when the coolant temperature is between -40°C and 40°C, the coolant flow rate is between 5 and 15 L / min, and the temperature of two electrical connection points of at least one of the relay, fuse, and sensor is greater than the first threshold, the battery management system is notified and the step of reducing the current in the circuit is executed.

[0053] With the above settings, when the coolant temperature and flow rate are normal, but the temperature of at least one device electrical connection point is still higher than the first threshold, the battery management system is first notified, and the step of reducing the loop current is executed to limit the power of the loop, thereby achieving the effect of protecting the relay circuit.

[0054] like Figure 4 As shown, in an embodiment of the present invention, after the step of reducing the current in the circuit, the high-voltage power distribution control method further includes: determining whether the temperatures of two electrical connection points of at least one of the relay, fuse, and sensor are both greater than a second threshold; if so, then performing the step of cutting off the relay circuit, wherein the second threshold is greater than the first threshold.

[0055] In the above technical solution, when the coolant temperature and flow rate are normal, the high-voltage power distribution control method makes a comprehensive judgment on the temperature of the electrical connection points of the relay, fuse and sensor again. Specifically, it judges whether the temperature of two electrical connection points of the above three components is greater than the second threshold.

[0056] If the temperature of the two electrical connection points of the relay rises above its second threshold within a short period of time (e.g., within 5 seconds), or if the temperatures of the two electrical connection points of both the relay and the fuse rise above their respective second thresholds within a short period of time (e.g., within 5 seconds), the high-voltage power distribution control method executes the step of cutting off the relay circuit. If, after reducing the circuit current, the temperature of the two electrical connection points of at least one of the relay, fuse, and sensor continues to rise (e.g., the rate of temperature rise is greater than or equal to 0.5℃ / s) to above the second threshold, the step of cutting off the relay circuit also needs to be executed to achieve the effect of protecting the high-voltage circuit.

[0057] like Figure 4 As shown, in an embodiment of the present invention, if the temperature difference between two electrical connection points at different locations on one of the relays, fuses, and sensors is greater than or equal to A℃, it is considered that the sampling sensor is faulty or the electrical connection of the device is abnormal; if the temperature difference between two electrical connection points at different locations on at least two of the relays, fuses, and sensors is greater than or equal to A℃, it is considered that the temperature rise is abnormal.

[0058] In the above technical solution, "at least two" refers to two or three devices. For example, when the temperature difference between the two electrical connection points of the relay is greater than or equal to A℃, and the temperature difference between the two electrical connection points of the fuse and the sensor is less than A℃, it can be considered that the sampling sensor of the relay is faulty or that there is an abnormality in the electrical connection of the relay. When the temperature difference between the two electrical connection points of the relay and the fuse is greater than or equal to A℃, regardless of whether the temperature difference between the two electrical connection points of the current sensor is greater than or equal to A℃, it can be considered that there is an abnormal temperature rise in the relay circuit, which needs to be reported to the BMS. The BMS will limit the power and increase the cooling flow. If the temperature of the relay and the fuse does not drop within a certain time (e.g., within 5 seconds), it is necessary to execute the step of cutting off the relay circuit to protect the safety of the high-voltage circuit.

[0059] like Figure 4 As shown, in an embodiment of the present invention, after the step of cutting off the relay circuit, the high-voltage power distribution control method further includes a step of detecting whether the current in the battery module circuit is greater than a preset value; if so, the fuse is activated.

[0060] In the above technical solution, the preset value range of the current in the battery module circuit is -500A to 1500A. When the high-voltage circuit current is greater than 1500A, the step of activating the fuse is executed, thereby ensuring the safety of the high-voltage power distribution control system.

[0061] As can be seen from the above, the high-voltage power distribution control method of the present invention and its embodiments has the following advantages:

[0062] 1. The battery management system can detect the coolant temperature, battery current, and the temperature of the electrical connection points of three components (relay, fuse, and current sensor) to comprehensively determine the abnormality of the components or electrical connection. It can also activate the fuse to cut off the high-voltage circuit and ensure the safety of the high-voltage electrical connection circuit.

[0063] 2. It can detect the temperature of the electrical connection points of fuses and relays in real time and store it in the storage unit. It can comprehensively judge whether the temperature rise occurs under the same operating conditions and realize the life monitoring function of fuses and relays.

[0064] like ​ As shown, in an embodiment of the present invention, the high-voltage power distribution control method further includes the step of generating and storing fault codes for abnormal temperature rise, abnormal sampling sensor, and abnormal electrical connection of components.

[0065] In the technical solution, the high-voltage power distribution control method can form a database of corresponding current values and temperature values and fault forms in various fault conditions, wherein the fault forms also include temperature rise of components (i.e., only the temperature of the electrical connection point of the component increases when the flow of the cooling liquid is increased). In this way, the staff can conveniently call information to determine the fault form or monitor the service life of the components in the high-voltage power distribution control system.

[0066] The embodiment of the application also includes a hybrid vehicle for executing the high-voltage power distribution control method described above.

[0067] From the above description, it can be seen that the above-mentioned embodiments of the application achieve the following technical effects: the high-voltage power distribution control system adopts a water-cooled form, and by setting a cooling circuit, the components and battery modules in the battery pack circuit unit can be cooled, thereby avoiding the problem that the temperature of the components in the high-voltage power distribution control system is too high due to insufficient current-carrying capacity; the temperature detection unit includes multiple temperature detection points, which can detect the temperature of the cooling liquid, the temperature of the electrical connection point of the relay, the temperature of the electrical connection point of the fuse, and the temperature of the electrical connection point of the sensor, wherein two temperature detection points are provided for each of the electrical connection point of the relay, the electrical connection point of the fuse, and the electrical connection point of the sensor, so that when one of the sampling sensors for detecting temperature fails, the temperature detection result can be avoided to be inaccurate. The battery controller can determine whether the relay circuit is abnormal and which abnormality occurs according to the temperature detected by the temperature detection unit and the current detected by the current sensor, and when the relay circuit is abnormal, the battery controller can control the excitation fuse to cut off the relay circuit, thereby ensuring the safety of the relay circuit. When the temperatures of the two electrical connection points of the components are both higher than the first threshold value, the first determination step includes determining whether the difference between the temperatures of the two electrical connection points is greater than or equal to A℃, and if so, the step of detecting whether the temperature and flow of the cooling liquid are normal is performed. When the temperature and flow of the cooling liquid are not normal, the step of increasing the flow of the cooling liquid in the cooling circuit is performed, and the step of obtaining the temperature of the electrical connection point of each component is repeatedly performed; when the temperature and flow of the cooling liquid are normal, it is determined whether the temperatures of the two electrical connection points of the three components are greater than the second threshold value. When the difference between the temperatures of the two electrical connection points at different positions of one of the relay, the fuse, and the sensor is greater than or equal to A℃, it is considered that the sampling sensor fails or the electrical connection of the component is abnormal; when the difference between the temperatures of the two electrical connection points at different positions of at least two of the relay, the fuse, and the sensor is greater than or equal to A℃, it is considered that the temperature rise is abnormal.

[0068] The above merely describes the preferred embodiments of the present application, and is not used to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A high voltage power distribution control method, characterized by, The high-voltage power distribution control system comprises: The battery pack circuit breaking unit comprises a relay, a fuse, a current sensor, and a cooling circuit, and the current sensor is used to detect the current of the battery module; The temperature detection unit is used to detect the temperature of the cooling liquid in the cooling circuit and the temperature of the electrical connection points of the relay, the fuse, and the sensor; The battery controller is connected to the temperature detection unit and the current sensor, and is used to control the relay circuit, the high-voltage circuit, and the cooling circuit. The temperature of the cooling liquid in the cooling circuit of the battery pack circuit breaking unit is detected. The current of the battery module is obtained. The temperature of the electrical connection points of the components in the battery pack circuit breaking unit is obtained, and the components include the relay, the fuse, and the current sensor. The relay circuit, the high-voltage circuit, and the cooling circuit are controlled according to the temperature of the cooling liquid, the current, and the temperature of the electrical connection points of the components. The high-voltage power distribution control method further comprises judging whether the temperatures of the two electrical connection points at different positions of the components are both greater than a first threshold value, and if so, performing the first judgment step; if not, repeating the step of obtaining the temperature of the electrical connection points of the components, wherein the components include at least one of the relay, the fuse, and the current sensor. The first judgment step comprises judging whether the difference between the temperatures of the two electrical connection points is greater than or equal to A degrees Celsius, and when the temperatures of the two electrical connection points of the components are both greater than the first threshold value, the high-voltage power distribution control method further comprises a step of detecting whether the temperature and flow rate of the cooling liquid are normal. The prerequisite for detecting whether the temperature and flow rate of the cooling liquid are normal is that the difference between the temperatures of the two electrical connection points of any one of the relay, the fuse, and the current sensor is greater than or equal to A degrees Celsius. When at least one of the temperature and flow rate of the cooling liquid is abnormal, the step of increasing the flow rate of the cooling liquid in the cooling circuit is performed, and the step of obtaining the temperature of the electrical connection points of each component is repeated.

2. The high voltage power distribution control method of claim 1, wherein, When the temperature of the cooling liquid is between -40 degrees Celsius and 40 degrees Celsius, the flow rate of the cooling liquid is between 5 liters per minute and 15 liters per minute, and the temperatures of the two electrical connection points of at least one of the relay, the fuse, and the sensor are both greater than the first threshold value, the battery management system is reported and the step of reducing the current in the circuit is performed.

3. The high voltage power distribution control method of claim 2, wherein, After the step of reducing the current in the circuit, the high-voltage power distribution control method further comprises judging whether the temperatures of the two electrical connection points of at least one of the relay, the fuse, and the sensor are both greater than a second threshold value, and if so, performing the step of cutting off the relay circuit, wherein the second threshold value is greater than the first threshold value.

4. The high-voltage power distribution control method according to claim 1, wherein When the difference between the temperatures of the two electrical connection points at different positions of one of the relay, the fuse, and the sensor is greater than or equal to A degrees Celsius, it is considered that the sampling sensor has failed or that the electrical connection of the component is abnormal. The temperature rise is abnormal when the difference between the temperatures of two electric connection points at different positions on at least two of the relay, the fuse and the sensor is greater than or equal to A degrees Celsius.

5. The high voltage power distribution control method of claim 3, wherein, After the step of cutting off the relay loop, the high-voltage power distribution control method further includes a step of detecting whether the current in the battery module loop is greater than a preset value, and if so, activating the fuse.

6. The high voltage power distribution control method of claim 4, wherein, The high-voltage power distribution control method further includes a step of storing a fault code formed by the temperature rise abnormality, the sampling sensor abnormality and the abnormality of the electric connection of the components and elements.

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