Battery pack liquid cooling system and blockage detection and maintenance method thereof

Abstract

The invention provides a battery pack liquid cooling system and a blockage detection and maintenance method thereof, and relates to the technical field of batteries, a shunting joint is detachably connected to a box body, so that circulating flow of cooling liquid in a battery pack is realized, the blocked shunting joint is convenient to clean or maintain, and the battery pack is prevented from being blocked. The battery management system can monitor the temperature of each position in the battery pack in real time through a plurality of temperature detection modules and a plurality of sampling points. In this way, the situation that the temperature of a local area is abnormal due to the fact that the flow of cooling liquid is blocked due to the liquid cooling system fault caused by blockage of the shunting connector can be effectively captured. Based on the real-time temperature data, the battery management unit can accurately analyze the specific position of blockage, and after the blockage position is determined, the shunting joint at the corresponding position can be cleaned or replaced, so that the blockage detection efficiency and maintenance efficiency of the liquid cooling system are improved, and the reliability of the liquid cooling system is improved while the maintenance cost is reduced.

Description

Technical Field

[0001] The present invention relates to the technical field of battery liquid cooling, and in particular to a battery pack liquid cooling system and a blockage detection and maintenance method thereof. Background Art

[0002] With the widespread application of new energy vehicles, energy storage systems and other high-power electronic devices, temperature management of battery packs has become one of the key technologies to ensure equipment safety, improve efficiency and extend service life. As an efficient thermal management solution, liquid cooling systems have been widely used in the heat dissipation system of battery packs. The liquid cooling system absorbs heat inside the battery pack through circulating coolant and releases it through a heat sink, thereby effectively controlling the temperature of the battery. However, with the use of the liquid cooling system, especially under long-term operating conditions, blockage may occur inside the liquid cooling system, which will affect the heat dissipation efficiency of the system and even cause battery overheating, which may cause safety problems in severe cases.

[0003] At present, the existing battery pack liquid cooling system does not provide effective detection methods for possible blockage problems in the liquid cooling system during design and maintenance. Most liquid cooling systems lack real-time monitoring and fault warning functions and cannot detect blockages in time. Once blockage occurs, the problem can often only be discovered through indirect methods such as comprehensive inspection or flow detection, which not only increases the difficulty of maintenance, but also makes it impossible to repair it in time.

[0004] In addition, the liquid cooling plate design in the prior art is usually an integrated module, and it is impossible to detect or repair the blockage problem inside the liquid cooling plate separately. When the liquid cooling plate is blocked, the prior art can only solve the problem by replacing the entire liquid cooling plate. This practice not only increases the maintenance cost, but also wastes a lot of available resources, which is not conducive to environmental protection and sustainable development. Summary of the invention

[0005] In view of this, the present invention proposes a battery pack liquid cooling system and a blockage detection and maintenance method thereof, which can effectively detect internal blockage of the battery pack liquid cooling system and facilitate maintenance, thereby improving the maintenance efficiency of the system, reducing costs and improving the reliability of the system.

[0006] The technical solution of the present invention is achieved in this way:

[0007] In a first aspect, the present invention provides a battery pack liquid cooling system, comprising:

[0008] The box body has liquid passage cavities formed inside the two side walls in the length direction of the box body, and the end of the box body has liquid passage openings connected to the liquid passage cavities, and the liquid passage openings are used for the coolant to enter and exit;

[0009] There are multiple liquid cooling plates, which are fixed vertically inside the box at equal intervals along the length direction of the box, and threaded interfaces are provided at both ends of the liquid cooling plates;

[0010] The battery cell is arranged between two adjacent liquid cooling plates;

[0011] The shunt joint is detachably arranged on the side wall of the box body, and comprises a connecting rod and a locking part connected to each other. The outer peripheral surface of one end of the connecting rod away from the locking part has an external thread. The connecting rod passes through the liquid passage cavity from the outer side wall of the box body and is connected to the threaded interface through the external thread. The locking part is sealed against the outer side wall of the box body. A shunt hole connected to the liquid passage cavity is provided on the connecting rod, and a shunt channel connected to the shunt hole is provided on one end of the connecting rod away from the locking part.

[0012] A battery management system includes a cell management unit and a battery management unit, wherein the cell management unit includes a plurality of temperature detection modules, a plurality of detection areas are arranged inside a box along its length direction, and each detection area is arranged along a plurality of sampling points along the width direction of the box, the temperature detection module is located at the sampling point, and is used to collect the cell temperature data at the sampling point, and the battery management unit is used to receive and process the temperature detection data transmitted by the cell management unit, and to determine whether there is a temperature anomaly in the box caused by a blockage of a shunt joint based on the temperature data analysis, so as to determine the detection area where the blockage occurs, so as to facilitate the repair or replacement of the shunt joint in the blocked detection area.

[0013] On the basis of the above technical solution, preferably, the battery management unit includes a processing unit and an acquisition module, the acquisition module is used to collect typical data under the battery pack charging condition, the typical data at least includes ambient temperature, water inlet temperature, bus current, battery cell starting minimum temperature and battery cell starting maximum temperature, the processing unit is used to receive the typical data transmitted by the acquisition module, under real-time conditions, the processing unit compares the current data collected under real-time conditions with the typical data stored in the basic database to determine whether blockage occurs.

[0014] On the basis of the above technical scheme, preferably, the box body includes a bottom plate, two horizontal frames and two vertical frames, the two horizontal frames are respectively fixed at the two ends of the bottom plate in the length direction, the two vertical frames are respectively fixed at the two ends of the bottom plate in the width direction, the horizontal frames, the vertical frames and the bottom plate enclose an installation cavity, the liquid cooling plate is vertically arranged in the installation cavity, the two ends of the liquid cooling plate are respectively connected to the vertical frames by fixing bolts, the liquid cavity is arranged inside the vertical frame in the length direction, the liquid port is located at one end of the vertical frame in the length direction, the connecting rod passes through the liquid cavity from the outer wall of the vertical frame and is connected to the threaded interface through an external thread, and the locking portion is sealed and abutted against the outer wall of the vertical frame.

[0015] Based on the above technical solution, preferably, the liquid cooling plate includes a heat exchange plate and a fluid collector fixedly arranged at both ends of the heat exchange plate, the heat exchange plate has a plurality of flow channels inside, and the threaded interface is arranged at one end of the fluid collector away from the heat exchange plate and is connected to the flow channel.

[0016] On the basis of the above technical solution, preferably, the inner wall and the outer wall of the longitudinal frame are respectively provided with a first connecting hole and a second connecting hole connected to the liquid hole, the connecting rod passes through the second connecting hole, the liquid cavity and the first connecting hole and is connected to the threaded interface, a first sealing member is provided between the threaded interface and the first connecting hole, and a second sealing member is provided between the locking portion and the second connecting hole.

[0017] On the basis of the above technical solution, preferably, the connecting rod includes a first rod portion and a second rod portion that are integrally connected, the diameter of the first rod portion is larger than the diameter of the second rod portion, the first rod portion is located in the liquid passage cavity, the diameter of the first connecting hole is larger than the diameter of the second rod portion, and smaller than the diameter of the first rod portion, the end face of the first rod portion and the inner wall of the liquid passage cavity on one side facing the first connecting hole are sealed by a third sealing member, the second rod portion is located in the threaded interface, and the external thread is arranged on the second rod portion, and a fourth sealing member is arranged between the outer peripheral surface of the second rod portion and the inner wall of the threaded interface.

[0018] In a second aspect, the present invention discloses a method for detecting and repairing a blockage in a battery pack liquid cooling system, comprising the following steps:

[0019] S1. After the electric equipment leaves the factory, typical data of the battery pack is collected and stored in the basic database;

[0020] S2. Under real-time charging conditions, continuously collect and update the typical database in the basic database, and compare the data under the current conditions with the basic database;

[0021] S3. When the real-time collected data is inconsistent with the data in the basic database, update the relevant data in the basic database;

[0022] S4. When a certain set of data collected under real-time working conditions is completely consistent with the same set of data in the database, the data under the current working conditions is extracted and continuously compared with the same set of data in the database. According to the difference between the real-time data and the typical data, the current difference, the temperature rise rate difference and the temperature difference comparison index are used to determine whether there is a blockage fault in the liquid cooling system, and the sampling point numbers that do not meet the set conditions in the detection area are recorded;

[0023] S5, locate the abnormal detection area and output the fault report;

[0024] S6. Dismantle the shunt joint on the located abnormal detection area and clean or replace it.

[0025] On the basis of the above technical solution, preferably, step S4 further includes the following steps:

[0026] S41, comparing the bus current difference of the group of data under the current working condition with the same group of data in the database at the same time, when the current difference is less than the set value, continue to compare, when the current difference is greater than the set value, end the continuous comparison;

[0027] S42. When the continuous comparison is finished, the data set under the current working condition is compared with the temperature rise rate difference and temperature difference corresponding to the same time period of all sampling points in the same group of data in the database. When the temperature rise rate difference and the temperature difference are both less than 0.1°C / min, the data set under the current working condition replaces the comparison data in the database. When the temperature rise rate difference and the temperature difference are both greater than 0.1°C / min, the sampling point numbers that do not meet the set conditions in the detection area are recorded.

[0028] On the basis of the above technical solution, preferably, step S5 specifically includes the following steps:

[0029] S51, when the number of abnormal temperatures of the detection points in the detection area is greater than or equal to N-1, the detection area number of the abnormality is output; when it is less than N-1, it is defined as a misjudgment, where N is the number of detection points in the detection area, and N≥3;

[0030] S52, when the abnormal output is the sampling column numbers at both ends of the box length direction, report the liquid cooling system blockage fault and the detection area corresponding to the sampling column number, and the shunt joint number and liquid cooling plate number corresponding to the detection area;

[0031] S53. When the abnormal output is the sampling column number in the middle of the box, the two sampling column numbers adjacent to the sampling column with the abnormal output number are compared, and the temperature rise rate difference corresponding to the same time period of all sampling points in the same group of data in the database is compared. When the temperature rise rate difference is less than 0.05℃ / min, the detection area numbers corresponding to both sides of the sampling column with the abnormal output number are reported, and the blockage fault of the liquid cooling system and the shunt joint number and liquid cooling plate number corresponding to the detection area are reported; when the temperature rise rate difference is greater than 0.05℃ / min, the detection area number on the corresponding side of the sampling column with the abnormal output number is reported, and the blockage fault of the liquid cooling system and the shunt joint number and liquid cooling plate number corresponding to the detection area are reported.

[0032] On the basis of the above technical solution, preferably, step S6 further includes the following steps:

[0033] S61, reading the number of the detection area where the blockage occurs, removing the shunt joints on both sides of the box corresponding to the detection area, and cleaning or replacing the shunt joints;

[0034] S62, perform a standard fast charging process, read the fault through the diagnostic instrument, if no fault is reported, the maintenance is completed, if there is a blockage fault, read the detection area number where the blockage occurs, and determine whether it is the same as the detection area of ​​the replaced shunt connector;

[0035] S63. When the number of the blocked area is different from the detection area of ​​the replaced shunt joint, perform step S61 again. When the number of the blocked area is the same as the detection area of ​​the replaced shunt joint, replace the liquid cooling plate corresponding to the detection area.

[0036] Compared with the prior art, the present invention has the following beneficial effects:

[0037] (1) By making the shunt joint detachable on the box, the circulation of the coolant in the battery pack is achieved. The shunt joint can be quickly removed from the box, making it easier to clean or repair the blocked shunt joint. The battery management system can monitor the temperature of each position inside the battery pack in real time through multiple temperature detection modules and multiple sampling points. This can effectively capture the failure of the liquid cooling system caused by the blockage of the shunt joint, which causes the flow of coolant to be blocked, resulting in abnormal temperature in the local area. Based on these real-time temperature data, the battery management unit can accurately analyze the specific location of the blockage, avoiding delays or missed detections caused by manual inspection or inaccurate detection in traditional methods. After the blockage location is determined, the shunt joint at the corresponding location can be cleaned or replaced, thereby improving the efficiency of liquid cooling system blockage detection and maintenance efficiency, reducing maintenance costs while improving the reliability of the liquid cooling system.

[0038] (2) By combining real-time data collection and typical data storage data comparison and analysis, efficient monitoring and fault diagnosis of the battery pack liquid cooling system can be achieved. By comparing the typical data collected under charging conditions with the real-time operating data, the battery management unit can promptly detect and determine whether there is a blockage, and combine the temperature detection data of each sampling point in the detection area to determine whether there is a temperature anomaly in the box caused by the blockage of the shunt joint based on the temperature data analysis, so as to determine the detection area where the blockage occurs, so as to facilitate the repair or replacement of the shunt joint in the blocked detection area.

[0039] (3) By setting up the shunt joint and multiple seals, the coolant can flow normally inside the battery pack while improving the structural fastening and sealing capabilities. At the same time, the shunt joint is convenient and quick to disassemble in the event of subsequent blockage, with high maintenance efficiency and low cost. In addition, the setting of the shunt joint and multiple seals also effectively solves the problem of coolant leakage that may be caused by vibration and long-term use, further improving the safety and reliability of the battery pack.

[0040] (4) The blockage detection and maintenance method disclosed in the present invention can effectively identify and locate blockage problems by comparing real-time data collection with the basic database and monitoring the liquid cooling system in combination with multiple indicators such as current and temperature. Each step, from data collection and real-time comparison to difference analysis, fault location, and maintenance operations, has clear processes and technical means to ensure the efficient and stable operation of the liquid cooling system. This method not only improves the accuracy of fault diagnosis, but also reduces maintenance time and costs, helping to improve the overall reliability and maintenance efficiency of the battery pack liquid cooling system.

[0041] (5) The bus current fluctuation is used to determine whether to end the current continuous comparison, thereby improving the efficiency of the comparison; by comparing the temperature rise rate difference and the temperature difference, it is accurately determined whether the cooling effect of the liquid cooling system is abnormal, and the database is updated in time and the fault area is recorded, ensuring the efficiency of fault location and the pertinence of subsequent maintenance. This series of measures effectively optimizes the monitoring capability of the system, making fault detection more precise and efficient. (6) By refining abnormal judgment, dynamically comparing the temperature rise rate difference and accurately locating the fault area, the intelligence and accuracy of the battery pack liquid cooling system blockage detection and maintenance methods are improved, which can effectively reduce misjudgment, improve the efficiency of fault location, and provide accurate guidance information for maintenance. This solution optimizes the monitoring and maintenance process of the liquid cooling system, has significant technical advantages, and plays an important role in the accuracy of fault diagnosis, maintenance efficiency and system reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0042] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. 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 paying creative work.

[0043] Figure 1 It is a schematic diagram of the three-dimensional structure of the battery pack liquid cooling system disclosed in the present invention;

[0044] Figure 2 An exploded diagram of the battery pack liquid cooling system disclosed in the present invention;

[0045] Figure 3 It is a schematic diagram of the structure of the liquid cooling plate disclosed in the present invention;

[0046] Figure 4 It is a schematic diagram of the three-dimensional structure of the flow diversion joint disclosed in the present invention;

[0047] Figure 5 A top view of the battery pack liquid cooling system disclosed in the present invention;

[0048] Figure 6 for Figure 5 Plane diagram at AA in the middle;

[0049] Figure 7 for Figure 6 A partial enlarged view of point B in the middle;

[0050] Figure 8 It is a schematic diagram of the arrangement positions of the sampling points disclosed in the present invention in the box;

[0051] Fig. 9 It is a schematic diagram of the arrangement of the detection area inside the box disclosed in the present invention;

[0052] Fig.10 It is a flow chart of a blockage detection method for a battery pack liquid cooling system disclosed in the present invention;

[0053] Fig.11 A flow chart of a method for repairing a blockage in a battery pack liquid cooling system disclosed in the present invention;

[0054] Reference numerals:

[0055] 1. Box body; 11. Bottom plate; 12. Horizontal frame; 13. Vertical frame; 131. Liquid cavity; 132. Liquid port; 133. First connecting hole; 134. Second connecting hole; 2. Liquid cooling plate; 21. Heat exchange plate; 22. Current collector; 211. Flow channel; 221. Threaded interface; 3. Battery cell; W. Fixing bolt; 4. Shunt joint; 41. Connecting rod; 42. Locking part; 411. External thread; 412 Shunt hole; 413. Shunt channel; M1. First seal; M2. Second seal; M3. Third seal; M4. Fourth seal; 41a. First rod; 41b. Second rod; Q. Detection area; P. Sampling point. DETAILED DESCRIPTION

[0056] The following will be combined with the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments 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 creative work are within the scope of protection of the present invention.

[0057] like Figure 1 As shown, combined Figure 2-7 The present invention discloses a battery pack liquid cooling system, including a box body 1, a liquid cooling plate 2, a battery cell 3, a shunt joint 4 and a battery management system.

[0058] Among them, the box body 1 serves as the battery pack shell, which is used to carry the internal battery cells 3 and provide an installation basis for the liquid cooling system. In this embodiment, liquid cavities 131 are opened inside the two side walls in the length direction of the box body 1, and the coolant can flow through this cavity. A liquid through hole 132 connected to the liquid through hole 131 is opened at the end of the box body 1, and the liquid through hole 132 is used for the coolant to enter and exit. In this embodiment, liquid cavities 131 are respectively set inside the two opposite side walls of the box body 1, so that liquid can enter one liquid through hole 131 and liquid can exit the other liquid through hole 131.

[0059] There are multiple liquid cooling plates 2, which are vertically fixed inside the box body 1 at equal intervals along the length direction of the box body 1. The liquid cooling plates 2 are vertically fixed inside the box body 1. On the one hand, the structural strength of the entire battery pack box body 1 is improved. On the other hand, it is convenient to install the battery cell 3 in the space formed by two adjacent liquid cooling plates 2 and the box body 1, so as to realize the contact heat exchange between the liquid cooling plate 2 and the side wall of the battery cell 3. Threaded interfaces 221 are respectively provided at both ends of the liquid cooling plate 2. The threaded interfaces 221 facilitate quick and detachable connection with the shunt joint 4, thereby improving the maintainability of the system and facilitating the introduction or extraction of the cooling liquid in the liquid cavity 131 into or out of the liquid cooling plate 2 through the shunt joint 4, so as to realize the circulation of the cooling liquid inside the battery pack.

[0060] The shunt joint 4 is detachably arranged on the side wall of the box body 1. The detachable structure allows the liquid cooling system to be accurately repaired and replaced when a blockage occurs. In the liquid cooling system, the blockage locations are mostly concentrated at the shunt joint 4. By removing the shunt joint 4, the shunt joint 4 can be quickly cleaned or replaced without replacing the liquid cooling plate 2.

[0061] In this embodiment, the diverter joint 4 includes a connecting rod 41 and a locking portion 42 that are interconnected. The outer peripheral surface of one end of the connecting rod 41 away from the locking portion 42 has an external thread 411. The connecting rod 41 passes through the liquid cavity 131 from the outer wall of the box body 1 and is connected to the threaded interface 221 through the external thread 411. The locking portion 42 is sealed against the outer wall of the box body 1. A diverter hole 412 connected to the liquid cavity 131 is opened on the connecting rod 41. A diverter channel 413 connected to the diverter hole 412 is opened at one end of the connecting rod 41 away from the locking portion 42.

[0062] By setting the shunt joint 4, the connecting rod 41 passes through the liquid cavity 131 and can be threadedly connected through the external thread 411 and the threaded interface 221 on the liquid cooling plate 2. At the same time, the locking portion 42 is abutted against the outer wall of the box body 1 to achieve a fixed connection between the liquid cooling plate 2 and the inner wall of the box body 1 in the horizontal direction. The shunt hole 412 and the shunt channel 413 are set on the shunt joint 4, so that the coolant in the liquid cavity 131 can pass through these holes to form a flow channel for the coolant inside the liquid cooling plate 2 and the box body 1. This structural setting effectively realizes the circulation of the coolant in the battery pack and improves the heat dissipation effect of the liquid cooling system. At the same time, when the shunt joint 4 is blocked, the shunt joint 4 can be quickly removed from the box body 1, so as to facilitate the cleaning or maintenance of the blocked shunt joint 4.

[0063] In order to determine the blockage position, the present embodiment further provides a battery management system, including a cell management unit and a battery management unit. The cell management unit includes multiple temperature detection modules. Multiple detection areas Q are arranged inside the box body 1 along its length direction. Each detection area Q is arranged along the width direction of the box body 1. A plurality of sampling points P are arranged. The temperature detection module is located at the sampling point P, and is used to collect the cell temperature data at the sampling point P. The battery management unit is used to receive and process the temperature detection data transmitted by the cell management unit, and to determine whether there is a temperature anomaly in the box body 1 caused by the blockage of the shunt joint 4 based on the temperature data analysis, so as to determine the detection area Q where the blockage occurs, so as to facilitate the repair or replacement of the shunt joint 4 in the blocked detection area Q.

[0064] The battery management system can monitor the temperature of various locations inside the battery pack in real time through multiple temperature detection modules and multiple sampling points P. This can effectively capture the failure of the liquid cooling system caused by the blockage of the shunt joint 4, which causes the flow of coolant to be blocked, resulting in abnormal temperature in the local area. Based on these real-time temperature data, the battery management unit can accurately analyze the specific location where the blockage occurs, avoiding delays or missed detections caused by manual inspection or inaccurate detection in traditional methods. After the blockage location is determined, the shunt joint 4 at the corresponding location can be cleaned or replaced, thereby improving the efficiency of liquid cooling system blockage detection and maintenance efficiency, reducing maintenance costs while improving the reliability of the liquid cooling system.

[0065] In order to determine whether the liquid cooling system is blocked, the present embodiment also discloses the following scheme: the battery management unit of the present embodiment includes a processing unit and an acquisition module, the acquisition module is used to collect typical data under the battery pack charging condition, the typical data includes at least the ambient temperature, the water inlet temperature, the bus current, the minimum starting temperature of the battery cell and the maximum starting temperature of the battery cell 3, the processing unit is used to receive the typical data transmitted by the acquisition module, under real-time conditions, the processing unit compares the current data collected under real-time conditions with the typical data stored in the basic database to determine whether blockage occurs.

[0066] Among the typical data above, the ambient temperature helps to evaluate the impact of external conditions on the liquid cooling system, the water inlet temperature reflects the temperature of the coolant, the bus current is the charging current of the battery pack, and the minimum starting temperature and the maximum starting temperature of the battery cell help monitor the temperature of different cells inside the battery pack. It is worth noting that the minimum starting temperature and the maximum starting temperature of the battery cell are obtained by the temperature detection module.

[0067] The basic database contains the above typical data collected under the battery pack charging condition, which represents the typical performance and expected state of the system under normal working conditions. The role of the basic database is to provide a reference for the comparison of real-time data. It will serve as a standard data set to determine whether the system is operating normally.

[0068] The core function of the processing unit is to compare the real-time operating data with the typical data stored in the basic database. The purpose of this comparison is to determine whether the current operating conditions match the typical data to ensure the normal operation of the liquid cooling system. If there is a deviation between the real-time data and the typical data, it may indicate that an abnormality has occurred in the liquid cooling system (such as blockage of the liquid cooling pipe, poor flow of coolant, etc.), and further inspection of the system failure is required. At this time, it is necessary to determine whether there is a temperature anomaly in the box 1 caused by the blockage of the shunt joint 4 based on the temperature data analysis, so as to determine the detection area Q where the blockage occurs, so as to facilitate the repair or replacement of the shunt joint 4 in the blocked detection area Q.

[0069] By combining real-time data collection and typical data storage data comparison and analysis, efficient monitoring and fault diagnosis of the battery pack liquid cooling system can be achieved. By comparing the typical data collected under charging conditions with the real-time operating data, the battery management unit can promptly detect and determine whether there is a blockage, and combine the temperature detection data of each sampling point P in the detection area Q. Based on the temperature data analysis, it is determined whether there is a temperature anomaly in the box 1 caused by the blockage of the shunt joint 4, so as to determine the detection area Q where the blockage occurs, so as to facilitate the repair or replacement of the shunt joint 4 in the blocked detection area Q.

[0070] The box body 1 disclosed in this embodiment includes a bottom plate 11, two horizontal frames 12 and two vertical frames 13. The two horizontal frames 12 are respectively fixedly arranged at the two ends of the bottom plate 11 in the length direction, and the two vertical frames 13 are respectively fixedly arranged at the two ends of the bottom plate 11 in the width direction. The horizontal frames 12, the vertical frames 13 and the bottom plate 11 enclose an installation cavity, and the liquid cooling plate 2 is vertically arranged in the installation cavity. The two ends of the liquid cooling plate 2 are respectively connected to the vertical frames 13 through fixing bolts W. The liquid passage cavity 131 is arranged inside the vertical frame 13 in the length direction, and the liquid passage port 132 is located at one end of the vertical frame 13 in the length direction. The connecting rod 41 passes through the liquid passage cavity 131 from the outer wall of the vertical frame 13 and is connected to the threaded interface 221 through the external thread 411, and the locking portion 42 is sealed and abutted against the outer wall of the vertical frame 13.

[0071] In this embodiment, the flow diversion joint 4 passes horizontally through the longitudinal frame 13 and is threadedly fastened to the liquid cooling plate 2. On the one hand, a firm connection is achieved between the two to improve the sealing effect of the connection, and on the other hand, the coolant is ensured to enter the liquid cooling plate 2 in the liquid passage cavity 131. At the same time, the longitudinal frame 13 and the liquid cooling plate 2 are connected by fixing bolts W, which further ensures the fixation of the liquid cooling plate 2 in the box 1, avoids the loosening of the liquid cooling plate 2 due to vibration or external force during operation, and ensures the sealing effect of the connection between the liquid cooling plate 2 and the longitudinal frame 13.

[0072] In the above embodiment, the locking portion 42 is preferably a bolt cap, which is convenient for turning the knob with a wrench, so that the shunt joint 4 can quickly connect the longitudinal frame 13 and the liquid cooling plate 2, and form a flow passage among the liquid cavity 131, the shunt joint 4 and the liquid cooling plate 2.

[0073] As some preferred embodiments, the liquid cooling plate 2 includes a heat exchange plate 21 and a current collector 22 fixedly disposed at both ends of the heat exchange plate 21. The heat exchange plate 21 has a plurality of flow channels 211 inside. The threaded interface 221 is disposed at one end of the current collector 22 away from the heat exchange plate 21 and is in communication with the flow channel 211. By dividing the liquid cooling plate 2 into the heat exchange plate 21 and the current collector 22, the processing of the flow channel 211 inside the heat exchange plate 21 is facilitated, and the current collector 22 is conveniently connected to the shunt interface through the threaded interface 221. In this embodiment, the connection between the liquid cooling plate 2 and the current collector 22 is achieved through a welding process.

[0074] In order to realize the connection between the longitudinal frame 13 and the liquid cooling plate 2 by the diverter joint 4, the first connecting hole 133 and the second connecting hole 134 connected to the liquid hole are respectively provided on the inner wall and the outer wall of the longitudinal frame 13 in this embodiment. The connecting rod 41 passes through the second connecting hole 134, the liquid cavity 131 and the first connecting hole 133 and is connected to the threaded interface 221. A first sealing member M1 is provided between the threaded interface 221 and the first connecting hole 133, and a second sealing member M2 is provided between the locking portion 42 and the second connecting hole 134.

[0075] Specifically, the first seal M1 is located between the threaded interface 221 and the inner wall of the longitudinal frame 13. Through the setting of the first seal M1, after the shunt joint 4 realizes the fastening connection between the liquid cooling plate 2 and the inner wall of the box body 1, the first seal M1 can effectively seal the threaded interface 221 and the first connection hole 133 on the inner wall of the box body 1. In this way, even if the liquid cooling plate 2 and the box body 1 undergo a slight displacement after long-term operation or vibration, the first seal M1 can prevent the coolant from leaking from the connection between the threaded interface 221 and the inner wall of the box body 1, prevent the coolant from leaking into the box body 1, and reduce the risk of damage to the battery cell 3 caused by the coolant leakage. The setting of the second seal M2 can prevent or reduce the coolant in the liquid cavity 131 from leaking from the connection between the shunt joint 4 and the outer side of the box body 1.

[0076] As some preferred embodiments, the connecting rod 41 includes a first rod portion 41a and a second rod portion 41b that are integrally connected, the diameter of the first rod portion 41a is larger than the diameter of the second rod portion 41b, the first rod portion 41a is located in the liquid passage cavity 131, the diameter of the first connecting hole 133 is larger than the diameter of the second rod portion 41b, and smaller than the diameter of the first rod portion 41a, the end face of the first rod portion 41a and the inner wall of the liquid passage cavity 131 facing the first connecting hole 133 are sealed and connected by a third sealing member M3, the second rod portion 41b is located in the threaded interface 221, and the external thread 411 is arranged on the second rod portion 41b, and a fourth sealing member M4 is arranged between the outer peripheral surface of the second rod portion 41b and the inner wall of the threaded interface 221.

[0077] By arranging the connecting rod 41 in sections, after the entire shunt joint 4 passes through the longitudinal frame 13, the second rod portion 41b effectively establishes a threaded connection with the threaded interface 221 on the liquid cooling plate 2 through the external thread 411, and the first rod portion 41a is in the liquid passage cavity 131. The first rod portion 41a will not pass through the liquid passage cavity 131, and the diameter of the first rod portion 41a is larger than the diameter of the second rod portion 41b, so that the end face of the first rod portion 41a and the inner wall of the liquid passage cavity 131 can establish a sealed connection through the third seal, thereby preventing the coolant in the liquid passage cavity 131 from leaking into the battery pack from the connection between the first rod portion 41a and the first connecting hole 133, thereby improving the reliability of the liquid cooling seal.

[0078] By setting the fourth seal M4, the contact surface between the second rod portion 41b and the threaded interface 221 is fully sealed, thereby preventing the coolant from leaking from the connection between the second rod portion 41b and the threaded interface 221, and ensuring that the coolant will not leak to the first seal M1 at the connection gap between the second rod portion 41b and the threaded interface 221, thereby avoiding or reducing the risk of the coolant leaking from the connection between the liquid cooling plate 2 and the inner wall of the longitudinal frame 13 to the inner side of the box body 1.

[0079] The battery pack liquid cooling system disclosed in the above embodiment improves the structural fastening and sealing capabilities while ensuring that the coolant can flow normally inside the battery pack through the provision of the shunt joint 4 and multiple seals. At the same time, the shunt joint 4 is convenient for quick and easy disassembly when a blockage occurs later, with high maintenance efficiency and low cost. In addition, the provision of the shunt joint 4 and multiple seals also effectively solves the problem of coolant leakage that may be caused by vibration and long-term use, further improving the safety and reliability of the battery pack.

[0080] The present invention also proposes a method for detecting and repairing blockage of a battery pack liquid cooling system. Figure 8-11 As shown, the steps include:

[0081] S1. After the electric equipment leaves the factory, typical data of the battery pack is collected and stored in the basic database;

[0082] The key to this step is to form a "typical data" set by initially collecting the performance of the battery pack liquid cooling system under typical working conditions. The working conditions focus on charging conditions, and the data include key parameters such as ambient temperature, water inlet temperature, bus current, minimum starting temperature of the battery cell, and maximum starting temperature of the battery cell. The database storing these typical data will serve as a reference value for the normal operation of the battery pack liquid cooling system, and will be used for subsequent real-time monitoring to compare with the data under actual working conditions.

[0083] S2. Under real-time charging conditions, continuously collect and update the typical database in the basic database, and compare the data under the current conditions with the basic database;

[0084] Under the battery pack charging condition, the acquisition module collects typical data in real time, and the real-time collected data is continuously stored and updated in the basic database. This step ensures that the data in the database can be dynamically adjusted as the battery pack usage conditions change, making it closer to the actual situation. Over time, the battery pack liquid cooling system will experience different loads and environmental conditions, and continuously updating the database can better adapt to various usage conditions.

[0085] S3. When the real-time collected data is inconsistent with the data in the basic database, the relevant data in the basic database is updated; when a certain typical data collected does not match the data in the database, it means that there is new typical data, and the relevant data in the database is automatically updated. The update of the database ensures that the system can adapt to these changes and improve monitoring accuracy.

[0086] S4. When a certain set of data collected under real-time working conditions is completely consistent with the same set of data in the database, the data under the current working conditions is extracted and continuously compared with the same set of data in the database. According to the difference between the real-time data and the typical data, the current difference, the temperature rise rate difference and the temperature difference comparison index are used to determine whether there is a blockage fault in the liquid cooling system, and the sampling point numbers that do not meet the set conditions in the detection area are recorded;

[0087] If a set of data collected in real-time conditions is completely consistent with the same set of data in the database, it means that the set of data meets expectations under normal operating conditions. At this point, the system begins to compare the differences between the real-time data and the database data in depth, focusing on indicators such as current difference, temperature rise rate difference, and temperature difference. These indicators can help determine whether there is a blockage in the liquid cooling system.

[0088] S5, locate the abnormal detection area and output the fault report;

[0089] S6. Dismantle the shunt joint on the located abnormal detection area and clean or replace it.

[0090] This method monitors the liquid cooling system through real-time data collection and comparison with the basic database, combining multiple indicators such as current and temperature, and can effectively identify and locate blockage problems. Each step, from data collection and real-time comparison to difference analysis, fault location, and maintenance operations, has clear processes and technical means to ensure the efficient and stable operation of the liquid cooling system. This method not only improves the accuracy of fault diagnosis, but also reduces maintenance time and costs, helping to improve the overall reliability and maintenance efficiency of the battery pack liquid cooling system.

[0091] In the above embodiment, step S4 also includes the following steps:

[0092] S41, comparing the bus current difference of the group of data under the current working condition with the same group of data in the database at the same time, when the current difference is less than the set value, continue to compare, when the current difference is greater than the set value, end the continuous comparison.

[0093] Since the bus current reflects the energy transmission during the charging process, its fluctuation is very sensitive to identifying differences in working conditions and can more accurately reflect changes in system status than other typical parameters (such as water inlet, etc.). When the bus current difference is greater than the set value, it means that the charging process has been abnormal or significantly changed. At this time, the meaning of comparison has been lost, and continuing to compare will waste time and computing resources. Therefore, setting the current difference threshold as the standard for the end of comparison is an efficient strategy.

[0094] For example, if the battery difference is less than 5A, when the current difference is less than the set value, continue to perform the comparison to ensure that the comparison process will not be terminated prematurely due to too small current fluctuations. When the current difference is greater than the set value, it means that there is an obvious abnormality in the liquid cooling system. At this time, you can stop the comparison and conduct a more in-depth fault location.

[0095] S42. When the continuous comparison is finished, the data set under the current working condition is compared with the temperature rise rate difference and temperature difference corresponding to the same time period of all sampling points in the same group of data in the database. When the temperature rise rate difference and the temperature difference are both less than 0.1°C / min, the data set under the current working condition replaces the comparison data in the database. When the temperature rise rate difference and the temperature difference are both greater than 0.1°C / min, the sampling point numbers that do not meet the set conditions in the detection area are recorded.

[0096] When the liquid cooling system is working, any blockage or flow obstruction will lead to a decrease in heat transfer efficiency, which in turn affects the temperature rise rate and temperature distribution. By comparing the temperature rise rate difference and temperature difference under the current working conditions, it can help to further diagnose whether there is a blockage. When the temperature rise rate difference and the temperature difference are both less than 0.1℃ / min, it means that the liquid cooling system under the current working conditions performs well. This set of data can be updated to the database as a new typical data reference to ensure the accuracy and real-time performance of the basic database. When the temperature rise rate difference and the temperature difference are both greater than 0.1℃ / min, it means that the liquid cooling system may have blockage or other performance problems. At this time, the system will record the sampling point numbers where these abnormal data are located, which is convenient for subsequent positioning of the detection area where the sampling points are located.

[0097] The bus current fluctuation is used to determine whether to end the current continuous comparison, improve the comparison efficiency, and accurately determine whether the cooling effect of the liquid cooling system is abnormal by comparing the temperature rise rate difference and the temperature difference. The database is updated and the fault area is recorded in time to ensure the efficiency of fault location and the pertinence of subsequent maintenance. This series of measures effectively optimizes the monitoring capability of the system and makes fault detection more precise and efficient.

[0098] In order to further determine whether the detection area in the box is blocked, this embodiment discloses the following technical solution.

[0099] Specifically, step S5 also includes the following steps:

[0100] S51. When the number of abnormal temperatures of the detection points in the detection area is greater than or equal to N-1, the abnormal detection area number is output. When it is less than N-1, it is defined as a misjudgment. N is the number of sampling points in the detection area, and N≥3.

[0101] By setting the threshold N-1, that is, only when the abnormal temperature points are close to the total number of the entire detection area, will it be confirmed that there is a problem in the area. This can reduce misjudgments caused by occasional or small-scale abnormalities and avoid misjudging accidental temperature fluctuations as system failures. For example, in this embodiment, the box is divided into 4 vertical detection areas from left to right, namely X-1, X-2, X-3 and X-4. Each vertical detection area has four small areas from top to bottom. The leftmost vertical detection area X-1 is divided into 1-1, 2-1, 3-1, and 4-1 from top to bottom. The two middle vertical areas are numbered 1-2, 2-2, 3-2, and 4-2 and 1-3, 2-3, 3-3, and 4-3. The rightmost vertical area is numbered 1-4, 2-4, 3-4, and 4-4. The 4 detection areas correspond to 5 sampling columns, namely NTCX-1, NTC X-2, and NTC X-3. X-2, NTCX-3, NTCX-4 and NTCX-5, each sampling row has 4 NTC sampling points from top to bottom, the top is NTC1-1 to NTC1-5 (corresponding to the first row of battery cells), the middle is NTC2-1 to NTC2-5 (corresponding to the second row of battery cells) and NTC3-1 to NTC3-5 (corresponding to the third row of battery cells), and the bottom is NTC4-1 to NTC4-5 (corresponding to the fourth row of battery cells). There is a vertical detection area between two sampling rows. For example, the vertical detection area X-1 is between the boxes NTCX-1 and NTCX-2.

[0102] In a vertical detection area, at least three sampling points in a sampling column must be abnormal before the area is considered to have a problem. This effectively avoids unnecessary alarms and overreactions, and improves detection accuracy and system stability.

[0103] In actual applications, the liquid cooling system may cause temporary fluctuations in certain temperature points due to changes in the external environment or other non-systemic reasons. By setting this abnormal quantity threshold, the system can make judgments based on the comprehensive performance of most detection points, reduce false alarms caused by local or occasional problems, and ensure the reliability of the final diagnosis results.

[0104] S52. When the abnormal output is the sampling column number at both ends of the length direction of the box, report the liquid cooling system blockage fault and the detection area corresponding to the sampling column number, and the shunt joint number and liquid cooling plate number corresponding to the detection area.

[0105] Specifically, when the abnormal sampling column number is the left and right sides of the box, and the abnormal detection area number is output as X-1 or X-5, it means that there are battery cells on the single side corresponding to the detection area. The judgment of this detection area is unique. At this time, when reporting fault information, not only the area where the abnormality occurs is pointed out, but also the specific hardware component number (such as the shunt joint number and the liquid cooling plate number) is reported. This can greatly improve the maintenance efficiency and accuracy, and reduce the positioning time and workload of maintenance personnel.

[0106] Specifically, if at least three sampling points in the first sampling column NTCX-1 on the far left are abnormal, it means that the detection area must be X-1, and if at least three sampling points in the last sampling column NTCX-5 on the far right are abnormal, it means that the detection area must be X-5. Because these sampling columns only have cells on one side, the detection area can be uniquely determined.

[0107] Step S53, when the abnormal output is the sampling column number in the middle of the box, the two sampling column numbers adjacent to the sampling column with the abnormal number are output, and the temperature rise rate difference corresponding to the same time period of all sampling points in the same group of data in the database is compared. When the temperature rise rate difference is less than 0.05℃ / min, the detection area numbers corresponding to both sides of the sampling column with the abnormal number are output, and the blockage fault of the liquid cooling system and the shunt joint number and liquid cooling plate number corresponding to the detection area are reported; when the temperature rise rate difference is greater than 0.05℃ / min, the detection area number on the corresponding side of the sampling column with the abnormal number is output, and the blockage fault of the liquid cooling system and the shunt joint number and liquid cooling plate number corresponding to the detection area are reported.

[0108] For example, when the output abnormal sampling column number is NTCX-2, the sampling column numbers NTCX-1 and NTCX-2 are judged to see which detection area's corresponding shunt joint is blocked. Then compare the temperature rise rate difference corresponding to all sampling points in the same group of data in the database under the current working condition. When the temperature rise rate difference is less than 0.05℃ / min, after narrowing the judgment standard of the temperature rate difference, if the sampling column numbers NTCX-1 and NTCX-2 both output abnormalities and the abnormal results are consistent, it means that the detection area numbered X-1 and the detection area numbered X-2 between NTCX-2 and NTCX-1 and NTCX-2 are blocked. If only one side is abnormal, for example, only NTCX-1 is abnormal, it means that the detection area numbered X-1 between NTCX-2 and NTCX-1 is blocked.

[0109] By refining abnormal judgment, dynamically comparing the temperature rise rate difference, and accurately locating the fault area, the intelligence and accuracy of the battery pack liquid cooling system blockage detection and maintenance method are improved, which can effectively reduce misjudgment, improve the efficiency of fault location, and provide accurate guidance information for maintenance. This solution optimizes the monitoring and maintenance process of the liquid cooling system and has significant technical advantages, especially in terms of fault diagnosis accuracy, maintenance efficiency and system reliability.

[0110] In order to repair the blockage, step S6 of the present invention further includes the following steps:

[0111] S61. Read the number of the detection area where the blockage occurs, remove the shunt joints on both sides of the box corresponding to the detection area, and clean or replace the shunt joints.

[0112] This step first locates the blocked detection area. By reading the specific area number, the diverter joint that may be blocked can be accurately found. The diverter joint is one of the key components of the liquid cooling system. It is responsible for guiding the coolant to flow to different areas. Once blocked, it will affect the liquid cooling effect. Therefore, cleaning or replacing the diverter joint can effectively solve the fluid blockage problem and restore the normal operation of the system.

[0113] S62. Perform a standard fast charging process and read the fault through the diagnostic instrument. When no fault is reported, the maintenance is completed. When there is a blockage fault, read the detection area number where the blockage occurs and determine whether it is the same as the detection area of ​​the replaced shunt connector.

[0114] By implementing a standard fast-charging process, the system can simulate loads under actual working conditions, thereby quickly verifying the working condition of the liquid cooling system. If the fault disappears after the repair and no fault is reported, it means that the shunt joint problem has been solved and the system has returned to normal operation. This verification process provides immediate feedback on the repair effect and ensures the effectiveness of the repair operation.

[0115] S63. When the number of the blocked area is different from the detection area of ​​the replaced shunt joint, perform step S61 again. When the number of the blocked area is the same as the detection area of ​​the replaced shunt joint, replace the liquid cooling plate corresponding to the detection area.

[0116] The liquid cooling plate is one of the core components of the battery pack liquid cooling system. It is responsible for heat exchange with the coolant. If the liquid cooling plate is blocked, the coolant may not circulate effectively, thus affecting the heat dissipation effect of the battery. This step confirms whether the fault location has been resolved and compares it with the corresponding area of ​​the shunt joint. Once it is confirmed that the blockage still exists and the shunt joint replacement area is ineffective, the liquid cooling plate needs to be disassembled and repaired.

[0117] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the protection scope of the present invention.

Claims

1. A battery pack liquid cooling system, characterized in that: include: A box body (1), wherein both side walls of the box body (1) in the longitudinal direction are provided with a liquid passage cavity (131), and an end of the box body (1) is provided with a liquid passage port (132) connected to the liquid passage cavity (131), and the liquid passage port (132) is used for the inlet and outlet of cooling liquid; A plurality of liquid cooling plates (2) are provided, which are vertically fixed inside the box body (1) at equal intervals along the length direction of the box body (1), and threaded interfaces (221) are respectively provided at both ends of the liquid cooling plates (2); The battery cell (3) is arranged between two adjacent liquid cooling plates (2); A flow diversion joint (4) is detachably arranged on the side wall of the box body (1), the flow diversion joint (4) comprises a connecting rod (41) and a locking portion (42) connected to each other, the outer peripheral surface of one end of the connecting rod (41) away from the locking portion (42) has an external thread (411), the connecting rod (41) passes through the liquid passage cavity (131) from the outer wall of the box body (1) and is connected to the threaded interface (221) through the external thread (411), the locking portion (42) is sealed against the outer wall of the box body (1), a flow diversion hole (412) connected to the liquid passage cavity (131) is provided on the connecting rod (41), and a flow diversion channel (413) connected to the flow diversion hole (412) is provided on one end of the connecting rod (41) away from the locking portion (42); A battery management system comprises a cell management unit and a battery management unit, wherein the cell management unit comprises a plurality of temperature detection modules, a plurality of detection areas (Q) are arranged inside a box along its length direction, each detection area (Q) is arranged along the width direction of the box (1), the temperature detection module is located at the sampling point (P) and is used to collect the cell temperature data at the sampling point (P), the battery management unit is used to receive and process the temperature detection data transmitted by the cell management unit, and based on the temperature data analysis, judge whether there is a temperature anomaly in the box (1) caused by the blockage of a shunt joint (4), so as to determine the detection area (Q) where the blockage occurs, so as to facilitate the repair or replacement of the shunt joint (4) in the blocked detection area (Q).

2. The battery pack liquid cooling system according to claim 1, characterized in that: The battery management unit includes a processing unit and an acquisition module. The acquisition module is used to collect typical data under the battery pack charging condition. The typical data at least includes ambient temperature, water inlet temperature, bus current, battery cell starting minimum temperature and battery cell starting maximum temperature. The processing unit is used to receive the typical data transmitted by the acquisition module. Under real-time conditions, the processing unit compares the current data collected under real-time conditions with the typical data stored in the basic database to determine whether blockage occurs.

3. The battery pack liquid cooling system according to claim 1, characterized in that: The box body (1) comprises a bottom plate (11), two transverse frames (12) and two longitudinal frames (13); the two transverse frames (12) are respectively fixedly arranged at two ends of the bottom plate (11) in the length direction; the two longitudinal frames (13) are respectively fixedly arranged at two ends of the bottom plate (11) in the width direction; the transverse frames (12), the longitudinal frames (13) and the bottom plate (11) enclose a mounting cavity; the liquid cooling plate (2) is vertically arranged in the mounting cavity; the two ends of the liquid cooling plate (2) are respectively connected to the longitudinal frames (13) by fixing bolts (W); the liquid passage cavity (131) is arranged inside the longitudinal frames (13) in the length direction; the liquid passage port (132) is located at one end of the longitudinal frames (13) in the length direction; the connecting rod (41) passes through the liquid passage cavity (131) from the outer wall of the longitudinal frames (13) and is connected to the threaded interface (221) through an external thread (411); and the locking portion (42) is sealed against the outer wall of the longitudinal frames (13).

4. The battery pack liquid cooling system according to claim 3, characterized in that: The liquid cooling plate (2) comprises a heat exchange plate (21) and a fluid collector (22) fixedly arranged at both ends of the heat exchange plate (21); the heat exchange plate (21) has a plurality of flow channels (211) inside; a threaded interface (221) is arranged at one end of the fluid collector (22) away from the heat exchange plate (21) and is in communication with the flow channel (211).

5. The battery pack liquid cooling system according to claim 3, characterized in that: The inner wall and outer wall of the longitudinal frame (13) are respectively provided with a first connecting hole (133) and a second connecting hole (134) which are connected to the liquid through hole; the connecting rod (41) passes through the second connecting hole (134), the liquid through cavity (131) and the first connecting hole (133) and is connected to the threaded interface (221); a first sealing member (M1) is provided between the threaded interface (221) and the first connecting hole (133); and a second sealing member (M2) is provided between the locking portion (42) and the second connecting hole (134).

6. The battery pack liquid cooling system according to claim 5, characterized in that: The connecting rod (41) comprises a first rod portion (41a) and a second rod portion (41b) which are integrally connected. The diameter of the first rod portion (41a) is larger than the diameter of the second rod portion (41b). The first rod portion (41a) is located in the liquid passage cavity (131). The diameter of the first connecting hole (133) is larger than the diameter of the second rod portion (41b) and smaller than the diameter of the first rod portion (41a). The end surface of the first rod portion (41a) and the inner wall of the liquid passage cavity (131) facing the first connecting hole (133) are sealed and connected via a third sealing member (M3). The second rod portion (41b) is located in the threaded interface (221), and an external thread (411) is provided on the second rod portion (41b). A fourth sealing member (M4) is provided between the outer peripheral surface of the second rod portion (41b) and the inner wall of the threaded interface (221).

7. A method for detecting and repairing a blockage in a battery pack liquid cooling system according to any one of claims 2 to 6, characterized in that , including the following steps: S1. After the electric equipment leaves the factory, typical data of the battery pack is collected and stored in the basic database; S2. Under real-time charging conditions, continuously collect and update the typical database in the basic database, and compare the data under the current conditions with the basic database; S3. When the real-time collected data is inconsistent with the data in the basic database, update the relevant data in the basic database; S4. When a certain set of data collected under real-time working conditions is completely consistent with the same set of data in the database, the data under the current working conditions is extracted and continuously compared with the same set of data in the database. According to the difference between the real-time data and the typical data, the current difference, the temperature rise rate difference and the temperature difference comparison index are used to determine whether there is a blockage fault in the liquid cooling system, and the sampling point numbers that do not meet the set conditions in the detection area are recorded; S5, locate the abnormal detection area and output the fault report; S6. Dismantle the shunt joint on the located abnormal detection area and clean or replace it.

8. The method for detecting and repairing blockage of a battery pack liquid cooling system according to claim 7, characterized in that: Step S4 also includes the following steps: S41, comparing the bus current difference of the group of data under the current working condition with the same group of data in the database at the same time, when the current difference is less than the set value, continue to compare, when the current difference is greater than the set value, end the continuous comparison; S42. When the continuous comparison is finished, the data set under the current working condition is compared with the temperature rise rate difference and temperature difference corresponding to the same time period of all sampling points in the same group of data in the database. When the temperature rise rate difference and the temperature difference are both less than 0.1°C / min, the data set under the current working condition replaces the comparison data in the database. When the temperature rise rate difference and the temperature difference are both greater than 0.1°C / min, the sampling point numbers that do not meet the set conditions in the detection area are recorded.

9. The method for detecting and repairing blockage of a battery pack liquid cooling system according to claim 8, characterized in that: Step S5 specifically includes the following steps: S51, when the number of abnormal temperatures of the detection points in the detection area is greater than or equal to N-1, the detection area number of the abnormality is output; when it is less than N-1, it is defined as a misjudgment, where N is the number of sampling points in the detection area, and N≥3; S52, when the abnormal output is the sampling column numbers at both ends of the box length direction, report the liquid cooling system blockage fault and the detection area corresponding to the sampling column number, and the shunt joint number and liquid cooling plate number corresponding to the detection area; S53, S53, when the abnormal output is the sampling column number in the middle of the box, output the two adjacent sampling column numbers of the sampling column with abnormal number, compare the temperature rise rate difference corresponding to the same time period of all sampling points in the same group of data in the database under the current working conditions, when the temperature rise rate difference is less than 0.05℃ / min, output the detection area number corresponding to both sides of the sampling column with abnormal number, report the blockage fault of the liquid cooling system and the shunt joint number and liquid cooling plate number corresponding to the detection area; when the temperature rise rate difference is greater than 0.05℃ / min, output the detection area number on the corresponding side of the sampling column with abnormal number, report the blockage fault of the liquid cooling system and the shunt joint number and liquid cooling plate number corresponding to the detection area.

10. The method for detecting and repairing blockage of a battery pack liquid cooling system according to claim 7, characterized in that: Step S6 also includes the following steps: S61, reading the number of the detection area where the blockage occurs, removing the shunt joints on both sides of the box corresponding to the detection area, and cleaning or replacing the shunt joints; S62, perform a standard fast charging process, read the fault through the diagnostic instrument, if no fault is reported, the maintenance is completed, if there is a blockage fault, read the detection area number where the blockage occurs, and determine whether it is the same as the detection area of ​​the replaced shunt connector; S63. When the number of the blocked area is different from the detection area of ​​the replaced shunt joint, perform step S61 again. When the number of the blocked area is the same as the detection area of ​​the replaced shunt joint, replace the liquid cooling plate corresponding to the detection area.

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