A power battery liquid cooling plate maintenance device and a maintenance method

Abstract

The embodiment of the present application relates to the technical field of power batteries, and discloses a power battery liquid cooling plate maintenance device and a maintenance method, the power battery liquid cooling plate maintenance device comprises a repair mold, a pressure perfusion device and a first pipeline, a flow channel constraint groove and a liquid cooling plate mounting structure are arranged on the repair mold, the liquid cooling plate mounting structure is used for fixing and mounting a repaired liquid cooling plate on the repair mold, the flow channel constraint groove is matched with the shape of a flow channel of the repaired liquid cooling plate, one end of the first pipeline is connected with the pressure perfusion device, and the other end of the first pipeline is used for being connected with the flow channel, and the pressure perfusion device is used for injecting liquid with pressure into the flow channel, so that recessed parts of the flow channel are reset. The technical scheme of the present application can solve the problems of insufficient repair quality and reliability of the repair scheme of the power battery liquid cooling plate in the prior art.

Description

Technical Field

[0001] This invention relates to the field of power battery technology, specifically to a power battery liquid cooling plate repair device and repair method. Background Technology

[0002] During vehicle use or maintenance, the liquid cooling plate of the power battery is prone to localized dents due to external impacts, resulting in a reduction in the cross-sectional area of ​​the liquid cooling channel, decreased cooling efficiency, and in severe cases, even the risk of thermal runaway. In related technologies, the common method for repairing localized dents in the power battery liquid cooling plate is to use a method of anchor welding followed by pull-out. This repair method has the following technical problems: the strength of the anchor-welded area on the liquid cooling plate is significantly reduced, causing the repaired area to soften, bend, crack, and exhibit large angular deformation. The repaired area is also prone to fatigue fracture under cyclic loads. Furthermore, weld penetration or tearing can easily occur during the welding and pull-out process, resulting in insufficient repair quality and reliability. Summary of the Invention

[0003] In view of the shortcomings of the prior art, the purpose of this application is to provide a power battery liquid cooling plate repair device and repair method, which aims to solve the problems of insufficient repair quality and reliability of the existing power battery liquid cooling plate repair scheme.

[0004] In a first aspect, embodiments of this application provide a power battery liquid cooling plate repair device, including a repair mold, a pressure injector, and a first pipe. The repair mold is provided with a flow channel constraint groove and a liquid cooling plate mounting structure. The liquid cooling plate mounting structure is used to fix the liquid cooling plate to be repaired on the repair mold. The flow channel constraint groove is adapted to the flow channel shape of the liquid cooling plate to be repaired. One end of the first pipe is connected to the pressure injector, and the other end of the first pipe is used to connect to the flow channel of the liquid cooling plate to be repaired. The pressure injector is used to inject pressurized liquid into the flow channel of the liquid cooling plate to be repaired, so that the recessed part of the flow channel is reset.

[0005] By employing the above-described technical solution, the flow channel constraint groove on the repair mold can mechanically constrain the shape of the flow channel of the liquid cooling plate being repaired. Then, pressurized liquid is injected into the flow channel through a pressure injector, causing the recessed area to undergo plastic deformation under the hydraulic pressure inside the flow channel and return to its original shape defined by the flow channel constraint groove. This allows the recessed area of ​​the flow channel to be reset. This repair method avoids the problems of reduced strength, weld cracking, angular deformation, and weld penetration associated with welding and pull-out repairs. Thus, the geometric shape of the flow channel is restored without thermal damage or material thinning, better ensuring the cooling performance and structural reliability of the liquid cooling plate being repaired.

[0006] In some embodiments, the power battery liquid cooling plate repair device further includes a vacuum generator and a second pipe, one end of the second pipe being connected to the vacuum generator and the other end of the second pipe being used to connect to the flow channel of the liquid cooling plate being repaired, and the vacuum generator being used to evacuate the flow channel of the liquid cooling plate being repaired.

[0007] By adopting the above technical solution, before injecting pressurized liquid into the flow channel of the liquid cooling plate being repaired, a vacuum generator can be used to evacuate the flow channel of the liquid cooling plate being repaired, thereby effectively removing residual air inside the flow channel. This prevents air from forming cavitation or air pockets in the flow channel during the subsequent injection of pressurized liquid, which would lead to uneven pressure distribution. This is beneficial for the pressure of the pressurized liquid to act evenly and fully on the dented area, thereby improving the consistency and controllability of the dented area reset effect.

[0008] In some embodiments, the power battery liquid cooling plate repair device further includes a control box, which is electrically connected to the pressure injector and the vacuum generator respectively. The control box is used to control the injection and pressurization operation of the pressure injector and the vacuum pumping operation of the vacuum generator.

[0009] By adopting the above technical solution, the pressure injector and vacuum generator are electrically controlled by a control box, which can realize the automated timing control and precise pressure regulation of processes such as vacuuming, liquid injection, and pressure holding. This avoids pressure fluctuations and operational errors caused by manual operation, which not only improves the repeatability and consistency of the maintenance process, but also reduces the dependence on the experience and skills of the operators.

[0010] In some embodiments, the power battery liquid cooling plate repair device further includes a liquid cooling plate constraint mold. The liquid cooling plate constraint mold is provided with a first constraint part, which is used to press against the flat plate portion of the liquid cooling plate to be repaired, so as to prevent the flat plate portion from bulging during the process of the pressure injector injecting pressurized liquid into the flow channel of the liquid cooling plate to be repaired.

[0011] By adopting the above technical solution, during the repair process, the first constraint part can be used to constrain the flat plate part of the liquid cooling plate being repaired, preventing the flat plate part from bulging during the injection of pressurized liquid into the flow channel of the liquid cooling plate being repaired by the pressure injector. This provides a basis for repairing the recessed part of the flow channel by applying pressure and plastic deformation inside the flow channel of the liquid cooling plate being repaired.

[0012] In some embodiments, the liquid-cooled plate constraint mold is detachably connected to the repair mold.

[0013] The above technical solution facilitates the clamping and disassembly of the liquid cooling plate being repaired, which helps to improve repair efficiency.

[0014] In some embodiments, the liquid cooling plate constraint mold includes a plurality of first constraint parts arranged sequentially at intervals, and a spacer groove is provided between two adjacent first constraint parts to avoid the flow channel area of ​​the liquid cooling plate being repaired.

[0015] By adopting the above technical solution and setting the interval groove, it is possible to avoid additional compression or scratches on the flow channel area and reduce the difficulty of arranging the liquid cooling plate to constrain the mold.

[0016] In some embodiments, the power battery liquid cooling plate repair device further includes an inlet and outlet constraint mold, the inlet and outlet constraint mold including a second constraint part, the second constraint part being used to sleeve the outer periphery of the flow channel inlet and outlet of the liquid cooling plate being repaired and the pipe end connected to the flow channel inlet and outlet, to prevent the flow channel inlet and outlet and the pipe end connected to the flow channel inlet and outlet from bulging during the process of the pressure injector injecting pressurized liquid into the flow channel of the liquid cooling plate being repaired.

[0017] By adopting the above technical solution, during the repair process, the inlet and outlet constraint mold can be used to provide external support and shape constraint for weak links such as the inlet and outlet of the flow channel and the pipe end. This effectively prevents the pressurized liquid from causing deformation or even damage to the inlet and outlet of the flow channel and the pipe end, thus protecting the structural integrity of the inlet and outlet of the flow channel and the pipe end, and avoiding the risk of sealing failure and pressurized liquid leakage caused by deformation of the inlet and outlet of the flow channel and the pipe end, thereby improving the safety of the repair process.

[0018] In some embodiments, the import / export constraint mold is detachably connected to the repair mold.

[0019] The above technical solution facilitates the clamping and disassembly of the liquid cooling plate being repaired, which helps to improve repair efficiency.

[0020] In some embodiments, the liquid cooling plate mounting structure includes a plurality of bolt holes provided on the repair mold and a plurality of mounting bolts detachably connected to the plurality of bolt holes; the battery pack containing the liquid cooling plate under repair is provided with a mounting part, and the plurality of mounting bolts are used to connect to the mounting part to fix the battery pack on the repair mold.

[0021] By adopting the above technical solution, the battery pack is fixedly installed on the repair mold using its original mounting part. The repair of the liquid cooling plate can be achieved without removing it, which helps to improve repair efficiency and prevents damage caused by removing and installing the liquid cooling plate.

[0022] Secondly, embodiments of this application provide a method for repairing a liquid cooling plate of a power battery. The method employs the liquid cooling plate repair device described in any of the preceding claims, and includes the following steps:

[0023] Drain the coolant from the flow channels of the liquid-cooled plate under maintenance;

[0024] The liquid cooling plate to be repaired is installed on the repair mold, so that the flow channel of the liquid cooling plate to be repaired fits into the flow channel constraint groove of the repair mold;

[0025] The first pipe connects the pressure injector to the flow channel of the liquid cooling plate being repaired;

[0026] Start the pressure injector and inject pressurized liquid at a preset pressure into the flow channel of the liquid cooling plate being repaired, so as to reset the recessed part of the flow channel. Attached Figure Description

[0027] To more clearly illustrate the technical solutions in the embodiments of this application or the background art, the accompanying drawings used in the embodiments of this application will be described below.

[0028] Figure 1 This is a schematic diagram of the structure of the power battery liquid cooling plate repair device disclosed in the embodiments of this application;

[0029] Figure 2 This is a schematic diagram of the operation of the power battery liquid cooling plate repair device disclosed in the embodiments of this application;

[0030] Figure 3 This is a structural schematic diagram of the liquid cooling plate under repair.

[0031] Figure 4 A schematic diagram of the recessed area of ​​the liquid cooling plate being repaired;

[0032] Figure 5 This is a flowchart of a power battery liquid cooling plate repair method disclosed in an embodiment of this application.

[0033] Explanation of reference numerals in the attached drawings: 1-Frame; 2-Mounting bolt; 3-Pressure injector; 4-First pipe; 5-Second pipe; 6-Vacuum generator; 7-Liquid cooling plate constraint mold; 8-Inlet / outlet constraint mold; 9-Control box; 10-Battery pack; 11-Liquid cooling plate under repair;

[0034] 101-Repair mold; 102-Support column; 103-Flow channel constraint groove; 104-Bolt hole; 701-First mounting part; 702-First constraint part; 801-Second mounting part; 802-Second constraint part; 1101-Plate part; 1102-Flow channel; 1103-Flow channel inlet and outlet; 1104-Recessed part. Detailed Implementation

[0035] The terms “first,” “second,” etc., are used for descriptive purposes only and have no sequential or technical meaning, nor should they be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated.

[0036] In the description of the embodiments of this application, unless otherwise expressly specified and limited, the terms "installation" and "connection" should be interpreted broadly. For example, "connection" can be a detachable connection or a non-detachable connection; it can be a direct connection or an indirect connection through an intermediate medium. Among them, "fixed connection" means that the two are connected to each other and the relative positional relationship remains unchanged after the connection.

[0037] The directional terms used in this application, such as "up," "down," "front," "back," "left," and "right," are only for reference to the orientation shown in the accompanying drawings. The directional terms are used to better and more clearly explain and understand this application, and are not intended to indicate the orientation of the device or component in a practical application scenario.

[0038] The embodiments of this application are described below with reference to the accompanying drawings.

[0039] As mentioned in the background technology, during vehicle use or maintenance, the liquid cooling plate of the power battery is prone to local dents due to external impacts, resulting in a reduction in the cross-sectional area of ​​the liquid cooling plate's flow channels, a decrease in cooling efficiency, and in severe cases, even the risk of thermal runaway. In related technologies, the method of pin welding followed by pull-out is commonly used to repair local dents in the power battery liquid cooling plate. This repair method has the following technical problems: the strength of the pin-welded area on the liquid cooling plate is significantly reduced, causing the repaired area to soften, bend, crack, and exhibit large angular deformation. The repaired area is prone to fatigue fracture under cyclic loads, and weld penetration or tearing is also likely to occur during the welding and pull-out process, resulting in insufficient repair quality and reliability.

[0040] To address this technical problem, this application proposes a power battery liquid cooling plate repair device. Please see below. Figure 1 , Figure 1 This is a schematic diagram of the power battery liquid cooling plate repair device disclosed in this application. The power battery liquid cooling plate repair device includes a repair mold 101, a pressure injector 3, and a first pipe 4. The repair mold 101 is provided with a flow channel constraint groove 103 and a liquid cooling plate mounting structure. The liquid cooling plate mounting structure is used to fix the liquid cooling plate 11 to be repaired on the repair mold 101. The flow channel constraint groove 103 is adapted to the shape of the flow channel 1102 of the liquid cooling plate 11 to be repaired. One end of the first pipe 4 is connected to the pressure injector 3, and the other end of the first pipe 4 is used to connect to the flow channel 1102 of the liquid cooling plate 11 to be repaired. The pressure injector 3 is used to inject pressurized liquid into the flow channel 1102 of the liquid cooling plate 11 to reset the recessed part 1104 of the flow channel 1102.

[0041] By employing the above-described technical solution, the flow channel 1102 of the liquid cooling plate 11 under repair can be mechanically constrained by the flow channel constraint groove 103 on the repair mold 101. Then, pressurized liquid is injected into the flow channel 1102 through the pressure injector 3, causing the recessed portion 1104 to undergo plastic deformation under the hydraulic pressure inside the flow channel 1102 and return to its original shape defined by the flow channel constraint groove 103. This allows the recessed portion 1104 of the flow channel 1102 to be reset. This repair method avoids problems such as reduced strength of the repaired part, weld cracking, angular deformation, and weld penetration caused by welding and pull-out repair. Thus, the geometry of the flow channel 1102 can be restored without thermal damage or material thinning, better ensuring the cooling performance and structural reliability of the liquid cooling plate 11 under repair.

[0042] Please see Figure 3 and Figure 4 , Figure 3 This is a schematic diagram of the structure of the liquid cooling plate 11 under repair. Figure 4 This is a schematic diagram of the recessed portion 1104 of the liquid cooling plate 11 under repair. A flow channel 1102 is provided inside the liquid cooling plate 11 under repair. One side of the liquid cooling plate 11 under repair has a flow channel inlet / outlet 1103 communicating with the flow channel 1102. The flow channel inlet / outlet 1103 includes an inlet and an outlet. The flow channel 1102 allows coolant to flow within the liquid cooling plate 11 under repair. The inlet allows coolant to enter the flow channel 1102, and the outlet allows coolant to flow out of the flow channel 1102. The flow channel 1102 protrudes downwards from the liquid cooling plate 11 under repair. The downwardly protruding portion of the flow channel 1102 is prone to forming a recessed portion 1104 after impact.

[0043] In some embodiments, the pressure injector 3 includes a manual hydraulic pump or an electric hydraulic pump. The pressure injector 3 employs either a manual hydraulic pump or an electric hydraulic pump, both of which can provide a stable and controllable high-pressure output to meet the pressure conditions required for the plastic deformation of the liquid cooling plate 11 being repaired.

[0044] More specifically, an electric hydraulic pump can be used to pump the hydraulic oil in the container into the flow channel 1102 of the liquid cooling plate 11 being repaired. Pressure is established through continuous pressurization and pressure holding control of the electric hydraulic pump, and pressure is released after a preset pressure holding time to discharge the hydraulic oil in the flow channel 1102.

[0045] In some embodiments, the power battery liquid cooling plate repair device further includes a vacuum generator 6 and a second pipe 5. One end of the second pipe 5 is connected to the vacuum generator 6, and the other end of the second pipe 5 is used to connect to the flow channel 1102 of the liquid cooling plate 11 to be repaired. The vacuum generator 6 is used to evacuate the flow channel 1102 of the liquid cooling plate 11 to be repaired.

[0046] By adopting the above technical solution, before injecting pressurized liquid into the flow channel 1102 of the liquid cooling plate 11 under repair, a vacuum generator 6 can be used to evacuate the flow channel 1102 of the liquid cooling plate 11 under repair, thereby effectively removing the residual air inside the flow channel 1102. This prevents air from forming cavitation or air pockets in the flow channel 1102 during the subsequent injection of pressurized liquid, which would lead to uneven pressure distribution. This is beneficial for the pressure of the pressurized liquid to act evenly and fully on the recessed part 1104, thereby improving the consistency and controllability of the reset effect of the recessed part 1104.

[0047] In some embodiments, the power battery liquid cooling plate repair device further includes a control box 9, which is electrically connected to the pressure injector 3 and the vacuum generator 6 respectively. The control box 9 is used to control the injection and pressurization operation of the pressure injector 3 and the vacuuming operation of the vacuum generator 6.

[0048] By adopting the above technical solution, the control box 9 is used to electrically control the pressure injector 3 and the vacuum generator 6, which can realize the automated timing control and precise pressure regulation of processes such as vacuuming, liquid injection, and pressure holding. This avoids pressure fluctuations and operational errors caused by manual operation, which not only improves the repeatability and consistency of the maintenance process, but also reduces the dependence on the experience and skills of the operators.

[0049] In some embodiments, the control box 9 includes a housing and a controller disposed within the housing. The controller is electrically connected to the pressure injector 3 and the vacuum generator 6, respectively. In specific implementations, the controller can be a programmable logic controller (PLC). The PLC can sequentially start the vacuum generator 6 to evacuate, shut down the vacuum generator 6, start the pressure injector 3 to pressurize and maintain pressure according to a preset repair operation sequence, and automatically release pressure after the pressure holding is completed, so as to realize the automatic control of the entire repair process of the flow channel 1102 of the liquid cooling plate 11 under repair.

[0050] In some embodiments, the control box 9 may further include a start button, a stop button, and an emergency stop button disposed on the box body, which are electrically connected to the controller. The start button is used to trigger the controller to automatically perform vacuuming, liquid injection, and pressure holding operations according to a preset sequence; the stop button is used to trigger the controller to terminate the current operation; and the emergency stop button is used to cut off the power supply to the pressure injector 3 and the vacuum generator 6 in an emergency.

[0051] In some embodiments, the power battery liquid cooling plate repair device further includes a pressure sensor and a vacuum sensor electrically connected to the controller. The pressure sensor is disposed on the first pipe 4 or at the output end of the pressure injector 3, and is used to detect the liquid pressure in the flow channel 1102 and feed back a pressure signal to the controller. The vacuum sensor is disposed on the second pipe 5 or at the input end of the vacuum generator 6, and is used to detect the vacuum level in the flow channel 1102 and feed back a vacuum level signal to the controller. The controller controls the operation of the pressure injector 3 and the vacuum generator 6 according to the pressure signal and the vacuum level signal to achieve closed-loop control of the injection pressure and the vacuum level.

[0052] In some embodiments, the power battery liquid cooling plate repair device further includes a liquid cooling plate constraint mold 7, which is provided with a first constraint part 702. The first constraint part 702 is used to press against the flat plate portion 1101 of the liquid cooling plate 11 to be repaired, so as to prevent the flat plate portion 1101 from bulging during the process of the pressure injector 3 injecting pressurized liquid into the flow channel 1102 of the liquid cooling plate 11 to be repaired.

[0053] By adopting the above technical solution, during the repair process, the first constraint part 702 can constrain the flat plate portion 1101 of the liquid cooling plate 11 being repaired, preventing the flat plate portion 1101 from bulging during the injection of pressurized liquid into the flow channel 1102 of the liquid cooling plate 11 being repaired by the pressure injector 3. This provides a basis for repairing the recessed portion 1104 of the flow channel 1102 by applying pressure and plastic deformation inside the flow channel 1102 of the liquid cooling plate 11 being repaired.

[0054] In some embodiments, the liquid-cooled plate constraint mold 7 is detachably connected to the repair mold 101. The liquid-cooled plate constraint mold 7 is provided with a first mounting part 701, and the first mounting part 701 is detachably connected to the repair mold 101 by a bolt fastening structure.

[0055] The above technical solution facilitates the clamping and disassembly of the liquid cooling plate 11 under maintenance, which helps to improve maintenance efficiency.

[0056] In some embodiments, the liquid cooling plate constraint mold 7 includes a plurality of first constraint parts 702 arranged sequentially at intervals, and a spacer groove is provided between two adjacent first constraint parts 702 to avoid the flow channel 1102 area of ​​the liquid cooling plate 11 being repaired.

[0057] By adopting the above technical solution and setting the interval groove, it is possible to avoid additional squeezing or scratching of the flow channel 1102 area, and reduce the difficulty of arranging the liquid cooling plate to constrain the mold 7.

[0058] As a preferred example, at least one liquid cooling plate constraint mold 7 is used to constrain the flat plate portion 1101 of the liquid cooling plate 11 under repair near the inlet / outlet side edge of the flow channel 1102 to prevent the flat plate portion 1101 from bulging deformation.

[0059] Normally, the liquid cooling plate 11 under repair is located on the upper side of the repair mold 101, and the lower end of the first constraint part 702 is provided with a pressing surface for pressing down on the upper side of the flat plate part 1101.

[0060] It should be noted that the plate part 1101 refers to the plate-shaped part on the liquid cooling plate 11 under maintenance that is located outside the flow channel 1102 area.

[0061] In some embodiments, the power battery liquid cooling plate repair device further includes an inlet and outlet constraint mold 8, which includes a second constraint part 802. The second constraint part 802 is used to be sleeved on the periphery of the flow channel inlet and outlet 1103 of the liquid cooling plate 11 to be repaired and the pipe end connected to the flow channel inlet and outlet 1103, so as to prevent the flow channel inlet and outlet 1103 and the pipe end connected to the flow channel inlet and outlet 1103 from bulging during the process of the pressure injector 3 injecting pressurized liquid into the flow channel 1102 of the liquid cooling plate 11 to be repaired.

[0062] By adopting the above technical solution, during the repair process, the inlet and outlet constraint mold 8 can be used to provide external support and shape constraint for weak links such as the inlet and outlet of the flow channel 1103 and the pipe end. This effectively prevents the pressurized liquid from causing deformation or even damage to the inlet and outlet of the flow channel 1103 and the pipe end, thus protecting the structural integrity of the inlet and outlet of the flow channel 1103 and the pipe end, and avoiding the risk of sealing failure and pressurized liquid leakage caused by deformation of the inlet and outlet of the flow channel 1103 and the pipe end, thereby improving the safety of the repair process.

[0063] More specifically, the inlet and outlet constraint mold 8 constrains the shape of the pipe at the inlet and outlet of the flow channel 1103. The cavity of the inlet and outlet constraint mold 8 is consistent with the outer contour of the pipe at the inlet and outlet of the flow channel 1103, so that the joint and pipe at the inlet and outlet of the flow channel 1103 can be deformed.

[0064] In some embodiments, the import / export constraint mold 8 is detachably connected to the repair mold 101. The import / export constraint mold 8 is provided with a second mounting part 801, and the second mounting part 801 is detachably connected to the repair mold 101 by a bolt fastening structure.

[0065] The above technical solution facilitates the clamping and disassembly of the liquid cooling plate 11 under maintenance, which helps to improve maintenance efficiency.

[0066] In some embodiments, the liquid cooling plate mounting structure includes a plurality of bolt holes 104 disposed on the repair mold 101 and a plurality of mounting bolts 2 detachably connected to the plurality of bolt holes 104 respectively; the battery pack 10 containing the liquid cooling plate 11 to be repaired is provided with a mounting part, and the plurality of mounting bolts 2 are used to connect to the mounting part to fix the battery pack 10 on the repair mold 101.

[0067] By adopting the above technical solution, the battery pack 10 is fixedly installed on the repair mold 101 using its original mounting part. The repair of the liquid cooling plate 11 can be achieved without removing it, which helps to improve repair efficiency and prevents damage caused by disassembling and assembling the liquid cooling plate 11.

[0068] In some embodiments, the power battery liquid cooling plate repair device includes a frame 1, which includes a repair mold 101 and multiple support columns 102 mounted on the lower side of the repair mold 101. A pressure injector 3, a vacuum generator 6, and a control box 9 can be mounted on the lower side of the repair mold 101. The frame 1 provides a stable mounting base for the pressure injector 3, the vacuum generator 6, and the control box 9.

[0069] Please see Figure 2 , Figure 2 This is a schematic diagram of the operation of the power battery liquid cooling plate repair device disclosed in this application. The process of repairing the dented part 1104 using the above-described power battery liquid cooling plate repair device is as follows:

[0070] After confirming that the liquid cooling plate 11 under repair is not leaking, drain the coolant from the flow channel 1102 of the liquid cooling plate 11 under repair.

[0071] Remove the base plate of the battery pack 10 and place the battery pack 10 on the repair mold 101. The flow channel 1102 needs to be fitted with the flow channel constraint groove 103. Use the mounting bolts 2 to fix the battery pack 10 on the repair mold 101. Use the first pipe 4 to connect the flow channel inlet and outlet 1103 to the pressure injector 3. Use the second pipe 5 to connect the flow channel inlet and outlet 1103 to the vacuum generator 6.

[0072] Start the vacuum generator 6 to reduce the pressure inside the flow channel 1102 to -0.095MPa and maintain it for 5 minutes to ensure that there is no air inside the flow channel 1102;

[0073] The hydraulic oil corresponding to the nominal capacity of the flow channel 1102 is injected into the flow channel 1102 through the pressure injector 3. The injection pressure is controlled at 15~20MPa until all the hydraulic oil is injected into the flow channel 1102.

[0074] After maintaining the internal pressure of flow channel 1102 for 2 minutes, depressurize and drain the hydraulic oil to complete the maintenance.

[0075] This application repairs the recessed portion 1104 of the flow channel 1102 of the liquid cooling plate 11 under repair by increasing internal pressure, thereby effectively improving the reusability of the battery liquid cooling plate. It can reduce the scrap rate of the battery liquid cooling plate after the battery pack 10 is deformed by impact, thus reducing the repair and replacement rate, lowering repair costs, and increasing the overall lifespan of the battery pack 10. Moreover, this repair method has low requirements for the repair environment and is widely applicable.

[0076] Please see Figure 5 , Figure 5 This is a flowchart illustrating a method for repairing a power battery liquid cooling plate according to an embodiment of this application. In some embodiments, this application provides a method for repairing a power battery liquid cooling plate, which employs the power battery liquid cooling plate repair device described in any of the above-mentioned embodiments. The method includes the following steps:

[0077] S100: Drain the coolant inside the flow channel 1102 of the liquid cooling plate 11 under maintenance;

[0078] S200: The liquid cooling plate 11 to be repaired is installed on the repair mold 101, so that the flow channel 1102 of the liquid cooling plate 11 to be repaired is fitted with the flow channel constraint groove 103 of the repair mold 101.

[0079] S300: The first pipe 4 is used to connect the pressure injector 3 to the flow channel 1102 of the liquid cooling plate 11 under maintenance;

[0080] S400: Start the pressure injector 3 to input pressurized liquid at a preset pressure into the flow channel 1102 of the liquid cooling plate 11 under maintenance, so as to reset the recessed part 1104 of the flow channel 1102.

[0081] In some embodiments, the power battery liquid cooling plate repair device further includes a vacuum generator 6 and a second pipe 5. One end of the second pipe 5 is connected to the vacuum generator 6, and the other end of the second pipe 5 is used to connect to the flow channel 1102 of the liquid cooling plate 11 to be repaired. The vacuum generator 6 is used to evacuate the flow channel 1102 of the liquid cooling plate 11 to be repaired. The above-described power battery liquid cooling plate repair method further includes the following steps: before connecting the pressure injector 3 to the flow channel 1102 of the liquid cooling plate 11 to be repaired using the first pipe 4, the vacuum generator 6 is started to reduce the pressure in the flow channel 1102 to -0.095MPa and maintain it for 5 minutes to ensure that there is no air in the flow channel 1102.

[0082] In some embodiments, the power battery liquid cooling plate repair device further includes a liquid cooling plate constraint mold 7 and an inlet / outlet constraint mold 8. The above-mentioned power battery liquid cooling plate repair method further includes the following steps: when the liquid cooling plate 11 to be repaired is installed on the repair mold 101, the liquid cooling plate constraint mold 7 and the inlet / outlet constraint mold 8 are installed on the repair mold 101.

[0083] As a preferred example, the repair method for the liquid cooling plate of a power battery includes the following steps:

[0084] After confirming that the liquid cooling plate 11 under repair is not leaking, drain the coolant from the flow channel 1102 of the liquid cooling plate 11 under repair.

[0085] Remove the base plate of the battery pack 10 and place the battery pack 10 on the repair mold 101. The flow channel 1102 needs to be fitted with the flow channel constraint groove 103. Use the mounting bolts 2 to fix the battery pack 10 on the repair mold 101. Use the first pipe 4 to connect the flow channel inlet and outlet 1103 to the pressure injector 3. Use the second pipe 5 to connect the flow channel inlet and outlet 1103 to the vacuum generator 6.

[0086] Start the vacuum generator 6 to reduce the pressure inside the flow channel 1102 to -0.095MPa and maintain it for 5 minutes to ensure that there is no air inside the flow channel 1102;

[0087] The hydraulic oil corresponding to the nominal capacity of the flow channel 1102 is injected into the flow channel 1102 through the pressure injector 3. The injection pressure is controlled at 15~20MPa until all the hydraulic oil is injected into the flow channel 1102.

[0088] After maintaining the internal pressure of flow channel 1102 for 2 minutes, depressurize and drain the hydraulic oil to complete the maintenance.

[0089] It should be understood that the application of this application is not limited to the examples above. Those skilled in the art can make improvements or modifications based on the above description, and all such improvements and modifications should fall within the protection scope of the appended claims. Those skilled in the art can understand that implementing all or part of the processes of the above embodiments and making equivalent changes according to the claims of this application still fall within the scope of this application.

Claims

1. A power battery liquid cooling plate repair device, characterized in that, The device includes a repair mold (101), a pressure injector (3), and a first pipe (4). The repair mold (101) is provided with a flow channel constraint groove (103) and a liquid cooling plate mounting structure. The liquid cooling plate mounting structure is used to fix the liquid cooling plate (11) to be repaired on the repair mold (101). The flow channel constraint groove (103) is adapted to the shape of the flow channel (1102) of the liquid cooling plate (11) to be repaired. One end of the first pipe (4) is connected to the pressure injector (3), and the other end of the first pipe (4) is used to connect to the flow channel (1102). The pressure injector (3) is used to inject pressurized liquid into the flow channel (1102) so that the recessed part (1104) of the flow channel (1102) is reset.

2. The power battery liquid cooling plate repair device as described in claim 1, characterized in that, It also includes a vacuum generator (6) and a second pipe (5), one end of the second pipe (5) is connected to the vacuum generator (6), and the other end of the second pipe (5) is used to connect to the flow channel (1102). The vacuum generator (6) is used to evacuate the flow channel (1102).

3. The power battery liquid cooling plate repair device as described in claim 2, characterized in that, It also includes a control box (9), which is electrically connected to the pressure injector (3) and the vacuum generator (6) respectively. The control box (9) is used to control the injection and pressurization operation of the pressure injector (3) and the vacuum operation of the vacuum generator (6).

4. The power battery liquid cooling plate repair device as described in claim 1, characterized in that, It also includes a liquid cooling plate constraint mold (7), which is provided with a first constraint part (702). The first constraint part (702) is used to press against the flat plate part (1101) of the liquid cooling plate (11) being repaired, so as to prevent the flat plate part (1101) from bulging during the process of the pressure injector (3) injecting pressurized liquid into the flow channel (1102).

5. The power battery liquid cooling plate repair device as described in claim 4, characterized in that, The liquid-cooled plate constraint mold (7) is detachably connected to the repair mold (101).

6. The power battery liquid cooling plate repair device as described in claim 4, characterized in that, The liquid cooling plate constraint mold (7) includes a plurality of first constraint parts (702) arranged sequentially at intervals, and a spacer groove is provided between two adjacent first constraint parts (702) to avoid the flow channel (1102).

7. The power battery liquid cooling plate repair device as described in claim 1, characterized in that, It also includes an inlet and outlet constraint mold (8), which includes a second constraint part (802). The second constraint part (802) is used to be fitted around the flow channel inlet and outlet (1103) of the liquid cooling plate (11) under maintenance and the pipe end connected to the flow channel inlet and outlet (1103) to prevent the flow channel inlet and outlet (1103) and the pipe end connected to the flow channel inlet and outlet (1103) from bulging during the process of the pressure injector (3) injecting pressurized liquid into the flow channel (1102).

8. The power battery liquid cooling plate repair device as described in claim 7, characterized in that, The import / export constraint mold (8) is detachably connected to the repair mold (101).

9. The power battery liquid cooling plate repair device as described in claim 1, characterized in that, The liquid cooling plate mounting structure includes multiple bolt holes (104) provided on the repair mold (101) and multiple mounting bolts (2) detachably connected to the multiple bolt holes (104); the battery pack (10) containing the liquid cooling plate (11) under repair is provided with a mounting part, and the multiple mounting bolts (2) are used to connect to the mounting part to fix the battery pack (10) on the repair mold (101).

10. A method for repairing a liquid cooling plate for a power battery, characterized in that, The power battery liquid cooling plate repair method uses the power battery liquid cooling plate repair device according to any one of claims 1-9, and the power battery liquid cooling plate repair method includes the following steps: Drain the coolant inside the flow channel (1102) of the liquid cooling plate (11) under maintenance; The liquid cooling plate (11) to be repaired is installed on the repair mold (101) so that the flow channel (1102) is fitted with the flow channel constraint groove (103) of the repair mold (101); The pressure injector (3) is connected to the flow channel (1102) by a first pipe (4); Start the pressure injector (3) to input pressurized liquid with a preset pressure into the flow channel (1102) so that the recessed part (1104) of the flow channel (1102) is reset.

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