Expansion force testing tool

Abstract

The utility model discloses an expansive force testing tool, which comprises a bearing unit, a base for bearing a battery module, a measuring unit, a force sensor and a display which are distributed in the battery module and are used for testing the pressure of the battery module, a heat management unit, and a liquid cooling plate for forming heat conduction coupling with the surface of the battery module, the utility model aims to solve the technical problem of how to measure the expansion force of a battery cell in a battery module under a safe condition.

Description

Technical Field

[0001] This utility model relates to the field of battery expansion force testing technology, and in particular to an expansion force testing fixture. Background Technology

[0002] With the rapid development of electric vehicles, energy storage devices, and other fields, battery modules have been widely used due to their advantages such as high energy density and long cycle life. However, during the charging and discharging process of battery modules, heat is generated inside the cells, causing the internal temperature of the module to rise and leading to battery expansion. To ensure the safety and stability of the battery system, it is necessary to test the expansion force of the battery module to evaluate its structural reliability and thermal management performance.

[0003] Existing module expansion force testing fixtures are mainly used to measure the expansion force of battery modules under different operating conditions. However, during the testing process, due to the lack of effective thermal management measures, the heat generated by the battery module cannot be dissipated in time, easily leading to excessively high battery temperatures. This affects the accuracy of the test results and may even pose a safety hazard of thermal runaway. In addition, most existing fixtures use a single measurement structure, making it difficult to ensure testing accuracy while also meeting the temperature regulation requirements of the battery module. Consequently, the true expansion force characteristics of the battery module cannot be accurately reflected during the testing process.

[0004] Therefore, there is an urgent need for an expansion force testing fixture that can ensure both safety and reliability during cell expansion force testing. Utility Model Content

[0005] One objective of this invention is to provide an expansion force testing fixture, which aims to solve the technical problem of how to measure the expansion force of cells within a battery module under safe conditions.

[0006] To achieve the above objectives, the present invention provides a solution as follows: an expansion force testing fixture, which includes a support unit, including a base for supporting a battery module; a measuring unit, including force sensors and a display distributed in the battery module for testing the pressure of the battery module; and a thermal management unit, including a liquid cooling plate for forming a thermal conductive coupling with the surface of the battery module.

[0007] Optionally, the thermal management unit includes a first liquid cooling plate and a second liquid cooling plate. The first liquid cooling plate is used to contact the side of the battery module in the width direction, and the second liquid cooling plate is disposed on the base and is used to contact the bottom surface of the battery module in the height direction.

[0008] Optionally, the support unit also includes mounting brackets symmetrically arranged at both ends of the base, and the mounting brackets are detachably connected to the first liquid cooling plate.

[0009] Optionally, the mounting frame is provided with a fixing hole, the first liquid cooling plate is provided with a mounting hole, and the fixing hole and the mounting hole are connected through a fixing member to connect the first liquid cooling plate and the mounting frame.

[0010] Optionally, the number of fixing holes is multiple, and the fixing holes are arranged at intervals in a direction perpendicular to the base, and the mounting hole is selected through different fixing holes to realize height-adjustable assembly.

[0011] Optionally, the bearing unit further comprises a reinforcing member, the reinforcing member is bridged between the two mounting frames, and is used for abutting against the first liquid cooling plate.

[0012] Optionally, the base comprises a base plate and a boss connected to each other, the boss is symmetrically arranged on both sides of the base plate in the length direction, the boss and the base plate surround to form a containing space, the second liquid cooling plate is assembled in the containing space, and the containing space is used for receiving and limiting the battery module.

[0013] Optionally, the thermal management unit further comprises an insulating heat conduction layer, the insulating heat conduction layer is arranged on the side of the second liquid cooling plate away from the base plate, and the insulating heat conduction layer is used for heat conduction between the bottom surface of the battery module.

[0014] Optionally, the mounting frame is provided with a clearance groove on the side close to the base, the clearance groove is matched with the boss, and the mounting frame is attached to the base.

[0015] Optionally, the thermal management unit further comprises a liquid guide pipe, the liquid guide pipe is connected between the first liquid cooling plate and the second liquid cooling plate.

[0016] The beneficial effects of the utility model lie in:

[0017] The traditional expansion force test tool usually only pays attention to the expansion force measurement of the battery module, and ignores the overheating problem caused by the temperature rise of the battery. Compared with the existing expansion force test tool, the application additionally provides a thermal management unit, the thermal management unit provides effective temperature regulation and heat dissipation measures, ensures that the temperature of the battery module remains in a safe working range during the expansion force test process, avoids adverse consequences caused by overheating, and can effectively deal with the safety hidden danger caused by thermal expansion of the battery module during the test process. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the drawings needed to be used in the embodiment or the prior art description will be briefly introduced below. Obviously, the drawings in the following description are only some embodiments of the utility model, and those skilled in the art can obtain other drawings from the structures shown in the drawings without creating creative labor.

[0019] Figure 1 It is a kind of expansion force test tool structure schematic diagram provided by the utility model embodiment.

[0020] Figure 2 is a front view of the expansion force test tool structure provided by the embodiment of the utility model,

[0021] Figure 3 is a side view of the expansion force test tool structure provided by the embodiment of the utility model.

[0022] Explanation of reference numerals:

[0023] 10, bearing unit; 11, base; 111, base plate; 112, boss; 113, containing space; 12, mounting frame; 121, fixing hole; 122, accommodation slot; 13, reinforcing member; 20, measuring unit; 21, force sensor; 22, display; 30, thermal management unit; 31, first liquid cooling plate; 311, mounting hole; 32, second liquid cooling plate; 33, insulating heat conduction layer; 34, liquid guide pipe; 40, battery module; 41, battery cell. DETAILED DESCRIPTION

[0024] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0025] It should be noted that all directional indications (such as up, down, left, right, front, back, etc.) in the embodiments of the utility model are only used to explain the relative positional relationship, movement condition, etc. between components in a certain specific posture, and if the specific posture changes, the directional indications will also change accordingly.

[0026] It should also be noted that when an element is referred to as being "fixed to" or "disposed on" another element, it can be directly on the other element or can have a middle element. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or can be indirectly connected to the other element through a middle element.

[0027] Please refer to Figure 1 , Figure 1 is a schematic diagram of the expansion force test tool structure provided by the embodiment of the utility model

[0028] The embodiment of the utility model provides an expansion force test tool, which aims to test the expansion force of the battery cell 41 while improving the safety and reliability of the test process and reducing the safety risk of the battery module 40 caused by abnormal temperature rise.

[0029] The expansion force test tool includes a bearing unit 10, a measuring unit 20, and a thermal management unit 30. The bearing unit 10 includes a base 11 for supporting and fixing the battery module 40 to ensure the stability of the battery module 40 during the test. The measuring unit 20 includes a plurality of force sensors 21 and a display 22, and is distributed between the battery cells 41 of the battery module 40, and is specifically used to test the expansion pressure of the battery cells 41 in the battery module 40 under different charge and discharge states. In the specific measurement process, the force sensor 21 and the display 22 are respectively arranged on the opposite sides of the battery cell 41 to be tested in the battery module 40, so as to monitor the expansion force of the battery module 40 in real time, and intuitively present the test data through the display 22, so as to accurately evaluate the mechanical stability and safety performance of the battery module 40.

[0030] In order to solve the problem that the existing expansion force test tool is easy to heat during the test, and the heat dissipation capacity is insufficient, and the battery safety problem may be caused, the thermal management unit 30 is arranged in the present application. The thermal management unit 30 includes a liquid cooling plate, and is in close contact with the surface of the battery module 40 through a heat conduction coupling mode, so as to effectively control the temperature of the battery module 40, so that the battery module 40 is always in a reasonable temperature range during the test. The liquid cooling plate is usually arranged on the opposite side of the measuring unit 20 or directly mounted on the bottom of the battery module 40, so as to realize efficient heat dissipation management without affecting the expansion force measurement.

[0031] In the embodiment, compared with the existing expansion force test tool, the present application can effectively deal with the safety hidden danger caused by thermal expansion of the battery module 40 during the test by additionally arranging the thermal management unit 30. At the same time, the thermal management unit 30 and the measuring unit 20 are independent and do not interfere with each other, which ensures the measurement accuracy and greatly improves the safety and reliability of the test. Not only the applicability of the equipment is enhanced, but also a more scientific test means is provided for the safety evaluation and optimization of the battery module 40.

[0032] Further, in some embodiments, in order to improve the thermal management effect of the expansion force test tool and keep the temperature distribution of the battery module 40 balanced during the test, the thermal management unit 30 includes a first liquid cooling plate 31 and a second liquid cooling plate 32.

[0033] The first liquid cooling plate 31 is mainly used for contacting the side surface in the width direction of the battery module 40, Figure 1The direction indicated by the middle X direction is the width direction of the battery module 40, and the setting position of the first liquid cooling plate 31 can be adjusted according to the specific size of the battery module 40, so as to ensure that the first liquid cooling plate 31 is closely attached to the side wall of the battery module 40, thereby effectively absorbing and conducting the heat generated by the battery module 40 during operation. The structural design of the first liquid cooling plate 31 helps to control the temperature of the side wall of the battery module 40, avoiding the problem that local overheating leads to abnormal test data or uneven expansion of the battery module 40 due to heat.

[0034] The second liquid cooling plate 32 is arranged on the base 11 and located below the battery module 40, so that the second liquid cooling plate 32 can be in direct contact with the bottom surface of the battery module 40 in the height direction of the battery module 40, Figure 1 The direction indicated by the middle Y direction is the height direction of the battery module 40. Since the bottom surface of the battery module 40 is usually an important area for heat dissipation, the addition of the second liquid cooling plate 32 can significantly improve the overall heat conduction efficiency of the module, so that the heat is quickly transferred to the cooling system and discharged in time, thereby maintaining the temperature stability of the battery module 40 during the test. In addition, the presence of the second liquid cooling plate 32 can also enhance the support stability of the battery module 40, ensuring that the module will not be displaced or deformed due to temperature changes during the test, thereby further ensuring the accuracy and reliability of the expansion force test.

[0035] In the embodiment, the cooperation of the first liquid cooling plate 31 and the second liquid cooling plate 32 enables the heat management unit 30 to efficiently control the temperature of the battery module 40 in multiple directions, achieving a more balanced heat dissipation effect. Not only does this improve the adaptability of the test tooling, but it also effectively reduces the safety risks caused by heat accumulation during the test of the battery module 40, providing a more stable and accurate test environment for the expansion force test of the battery module 40.

[0036] Further, please refer to Figure 2 , Figure 2 is a front view of an expansion force test tooling structure provided by an embodiment of the utility model. In some embodiments, in order to enhance the structural stability of the expansion force test tooling, improve the installation convenience and adaptability of the heat management unit 30, and the bearing unit 10 further comprises mounting racks 12 symmetrically arranged at both ends of the base 11.

[0037] The mounting racks 12 are arranged at both ends of the base 11 and are symmetrically distributed, so that the entire test tooling has good balance and stability, ensuring that the first liquid cooling plate 31 can be reliably supported during the test of the battery module 40, avoiding displacement or tilting caused by uneven stress or external interference. In addition, the mounting racks 12 can be designed in a modular manner, and their size and structure can be adjusted according to different specifications of the battery module 40, so as to adapt to the test requirements of various types of battery modules 40, thereby improving the application range of the test tooling.

[0038] In order to realize convenient installation and disassembly of the first liquid cooling plate 31, the mounting frame 12 and the first liquid cooling plate 31 are detachably connected. The detachable connection mode not only facilitates installation and maintenance, but also can flexibly replace or adjust the position of the first liquid cooling plate 31 according to actual test requirements, so as to optimize the fitting effect of the liquid cooling plate and the battery module 40, and ensure that the heat dissipation performance of the heat management unit 30 reaches the best state. At the same time, the detachable design also facilitates reconfiguration of the test tooling under different test scenarios, so that it can adapt to the test of battery modules 40 of different forms or sizes, improving the versatility and use efficiency of the equipment.

[0039] In the embodiment, the bearing unit 10 is provided with symmetrical mounting frames 12 at both ends of the base 11, and the first liquid cooling plate 31 is detachably connected, so that the installation of the first liquid cooling plate 31 is more flexible and reliable, and the operation convenience and applicability of the equipment are improved while ensuring the test accuracy, thereby providing a more stable and efficient support structure for the battery module 40 expansion force test.

[0040] Further, please refer to Figure 3 , Figure 3 is a side view of an expansion force test tooling structure provided by the utility model embodiment. On the basis of the mounting frame 12, in order to enhance the fixing stability of the first liquid cooling plate 31 and make its installation more flexible and adjustable, a plurality of fixing holes 121 are formed in the mounting frame 12, and corresponding mounting holes 311 are formed in the first liquid cooling plate 31. Through the cooperation of the fixing holes 121 and the mounting holes 311, the first liquid cooling plate 31 can be stably connected with the mounting frame 12, so as to ensure that it does not loosen or displace during the test process, and ensure the reliability and durability of the test tooling as a whole.

[0041] In the specific installation process, the fixing holes 121 and the mounting holes 311 are connected by penetrating the fixing member. The fixing member can adopt a bolt, a screw or other fastening device suitable for precise positioning, so as to ensure that the first liquid cooling plate 31 can be firmly fixed on the mounting frame 12, and at the same time has certain disassembly convenience, so that the user can adjust or replace the first liquid cooling plate 31 according to different test requirements.

[0042] In the embodiment, the fixing member penetrates the fixing holes 121 and the mounting holes 311 to connect the first liquid cooling plate 31 and the mounting frame 12, thereby improving the installation precision and structural stability. Compared with the traditional fixing mode such as clamping, the present scheme avoids the error or instability that may be caused by the traditional fixing mode, so that the test tooling can still maintain an efficient working state in the long-term use process.

[0043] Further, in order to enhance the installation flexibility of the first liquid cooling plate 31 and adapt to different sizes of battery modules 40, a plurality of fixing holes 121 are arranged on the mounting frame 12, and these fixing holes 121 are arranged in a spaced distribution in a direction perpendicular to the base 11. The appropriate fixing hole 121 can be selected for installation at different height positions to achieve height-adjustable assembly of the first liquid cooling plate 31.

[0044] In specific use, the first liquid cooling plate 31 is correspondingly provided with a mounting hole 311, and is connected by a fixing member (such as a bolt, screw, etc.) passing through the mounting hole 311 and the selected fixing hole 121, so that the first liquid cooling plate 31 can be adjusted up and down according to the size of the different battery modules 40 and the test requirements. The user can select the appropriate fixing hole 121 according to the height of the battery module 40, adjust the first liquid cooling plate 31 to the appropriate height, and ensure that it is in full contact with the side of the battery module 40 to achieve good heat conduction effect.

[0045] In this embodiment, the height-adjustable assembly structure makes the expansion force test tool have stronger adaptability, can be compatible with different specifications of battery modules 40, and avoids the problem that the liquid cooling plate cannot be closely attached to the module due to the fixed position being unadjustable. At the same time, the adjustment method is simple to operate, and the height adjustment can be realized without additional modification of the equipment, improving the use convenience and flexibility of the test tool. It can also reduce the complexity of processing and manufacturing to a certain extent, make the product have a wider range of applications, and effectively improve the accuracy and stability of the test.

[0046] In some embodiments, in order to improve the support strength of the first liquid cooling plate 31 during the test, the carrying unit 10 further includes a reinforcing member 13. The reinforcing member 13 is bridged between two symmetrically arranged mounting frames 12 to form a stable connection structure, and is used to abut against the first liquid cooling plate 31, thereby effectively improving the fixing strength of the liquid cooling plate and preventing it from being displaced or loosened due to uneven stress or external impact during long-term use.

[0047] Specifically, the reinforcing member 13 can be made of high-strength materials such as metal support rods, cross beams, or rigid plates to ensure that it has sufficient strength and durability when bearing external pressure. One end of the reinforcing member 13 is fixed to one mounting frame 12, and the other end is fixed to the symmetric mounting frame 12, so that it spans across the two sides of the test tool to form a stable bridging structure. In addition, the shape and size of the reinforcing member 13 can be optimized according to the actual test requirements to be compatible with different specifications of battery modules 40 and to ensure that it does not interfere with the normal operation of other test components.

[0048] In actual use, the reinforcing member 13 not only provides additional structural support, but also reduces the local stress concentration of the first liquid cooling plate 31 to some extent, thereby prolonging the service life of the test tool. At the same time, the abutting effect of the reinforcing member 13 can further enhance the close fit of the first liquid cooling plate 31 and the side surface of the battery module 40, so that it can achieve more efficient heat conduction during heat dissipation, thereby optimizing the overall thermal management effect.

[0049] In the present embodiment, by adding the reinforcing member 13 in the bearing unit 10, the structural stability of the expansion force test tool is improved, and the installation method of the liquid cooling plate is optimized, so that it can maintain a stable working state during high-precision testing, further improving the testing precision and safety, and providing a more stable and efficient support structure for the expansion force test of the battery module 40.

[0050] In some optimized embodiments, in order to enhance the bearing stability of the expansion force test tool and ensure the fixing effect of the battery module 40 during testing, the base 11 is composed of a base plate 111 and a boss 112 connected to each other. The boss 112 is symmetrically arranged on both sides of the length direction of the base plate 111, and together with the base plate 111 forms a structurally stable receiving space 113. The receiving space 113 can match the size of the battery module 40, so that it can be accurately positioned during testing, preventing displacement or shaking caused by external force or thermal expansion, thereby ensuring the accuracy and reliability of the test data.

[0051] At the same time, the second liquid cooling plate 32 is installed in the receiving space 113 and directly contacts the bottom surface of the battery module 40. The second liquid cooling plate 32 can efficiently conduct the heat generated by the battery module 40 during operation, and can also improve the overall thermal management capability of the test tool through uniform cooling effect. In addition, the installation method of the second liquid cooling plate 32 can adopt an embedded or fixed support structure to ensure that it is closely fitted with the receiving space 113, and is convenient to disassemble and replace, thereby improving the maintenance convenience of the test tool.

[0052] In the present embodiment, by surrounding the receiving space 113 with the base plate 111 and the boss 112, the receiving space 113 naturally limits and restricts the battery module 40 without relying on additional fixing devices, thereby improving the installation convenience of the test tool and reducing the assembly complexity. At the same time, the receiving space 113 not only provides a physical limiting effect for the battery module 40, but also optimizes the installation method of the second liquid cooling plate 32, so that it can be more conveniently and firmly assembled. The stability of the overall structure is enhanced, and the influence of the test precision caused by the loosening or displacement of the heat dissipation plate is avoided.

[0053] Further, the thermal management unit 30 also comprises an insulating and heat-conducting layer 33, which is arranged on the side of the second liquid cooling plate 32 away from the base plate 111. The purpose is to ensure the heat conduction between the battery module 40 and the liquid cooling plate, while avoiding electrical short circuit or damage of the battery module 40 and the base 11 or other components.

[0054] In the present embodiment, the main role of the insulating and heat-conducting layer 33 is to quickly transfer the heat generated on the bottom surface of the battery module 40 to the second liquid cooling plate 32 through its excellent heat conduction performance, thereby improving the overall heat dissipation effect. The insulating property can block the passage of current, avoiding direct electrical contact between the liquid cooling plate and the battery module 40, and ensuring the safety and stability of the tooling. The insulating and heat-conducting layer 33 can be made of high-performance heat-conducting materials (such as silicone, ceramic or other high-thermal-conductivity insulating materials) to ensure that it can achieve good heat conduction effect while maintaining electrical insulation. In addition, the insulating and heat-conducting layer 33 also has a certain flexibility, which can adapt to the slight unevenness of the surface of the battery module 40, ensure close contact of the contact surface, and maximize the heat conduction effect.

[0055] In some optimized embodiments, the mounting rack 12 is provided with a clearance groove 122 on the side close to the base 11. The purpose of the clearance groove 122 is to ensure that the mounting rack 12 can be closely fitted with the base 11, thereby enhancing the stability of the entire tooling and reducing the deviation or shaking caused by improper assembly.

[0056] The clearance groove 122 cooperates with the boss 112 to facilitate the accurate docking of the mounting rack 12 with the base 11 during installation. Moreover, through this cooperation, the mounting rack 12 can be stably fitted in the area in contact with the base 11, preventing the occurrence of gaps, thereby uniformly distributing stress and avoiding deformation or damage caused by uneven local stress.

[0057] In the present embodiment, the provision of the clearance groove 122 simplifies the installation process of the mounting rack 12 and promotes the close fitting of the mounting rack 12 and the base 11. The installer can accurately dock the mounting rack 12 with the base 11 through simple cooperation operation, without the need for additional fastening devices or complex adjustment procedures, reducing the assembly time and operation difficulty. The close fitting of the mounting rack 12 and the base 11 also enhances the overall stability, thereby effectively avoiding the loosening or position deviation of the components caused by vibration or external force during testing.

[0058] In some embodiments, the thermal management unit 30 also comprises a liquid guide pipe 34, which connects the first liquid cooling plate 31 and the second liquid cooling plate 32 to form an efficient liquid cooling circulation system. This structure avoids the complex structure of multiple liquid injection ports and liquid outlets required in traditional multi-liquid cooling plate cooling systems, simplifying the overall design and layout of the liquid cooling system.

[0059] In the present embodiment, by connecting the first liquid cooling plate 31 and the second liquid cooling plate 32 using the liquid guide pipe 34, the liquid cooling system realizes a single fluid flow path. The cooling liquid flows through the first liquid cooling plate 31 and the second liquid cooling plate 32 in turn, taking away heat in the process, and finally releasing the heat through an external cooling system. Compared with the design of the conventional system which requires multiple liquid injection ports and liquid outlet ports, this simplified structure not only reduces the number of components. At the same time, the setting of multiple liquid injection ports and liquid outlet ports is reduced, so that the installation and maintenance of the liquid cooling system are more convenient.

[0060] In the present utility model, the description of "first", "second" and the like is only for the purpose of description, and cannot be understood as indicating or implying the relative importance of the same or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" can explicitly or implicitly include at least one of the features. In addition, the technical solutions of each embodiment can be combined with each other, but it must be based on the realization of ordinary skilled in the art, when the combination of technical solutions appears contradictory or cannot be realized, it should be considered that the combination of technical solutions does not exist, nor within the scope of protection required by the present utility model.

[0061] The above is only the preferred embodiment of the present utility model, and does not limit the patent range of the present utility model, any equivalent structural transformation made by using the contents of the present utility model specification and drawings, or direct / indirect application in other related technical fields is included in the patent protection range of the present utility model.

Claims

1. A tooling for testing expansion force, characterized in that, include: The support unit includes a base for supporting the battery module; The measurement unit includes force sensors and a display distributed within the battery module for testing the pressure of the battery module; The thermal management unit includes a liquid cooling plate for forming a thermally conductive coupling with the surface of the battery module.

2. The expansion force testing fixture according to claim 1, characterized in that, The thermal management unit includes a first liquid cooling plate and a second liquid cooling plate. The first liquid cooling plate is used to contact the side of the battery module in the width direction, and the second liquid cooling plate is disposed on the base and is used to contact the bottom surface of the battery module in the height direction.

3. The expansion force testing fixture according to claim 2, characterized in that, The supporting unit also includes mounting brackets symmetrically arranged at both ends of the base, and the mounting brackets are detachably connected to the first liquid cooling plate.

4. The expansion force testing fixture according to claim 3, characterized in that, The mounting bracket has a fixing hole, and the first liquid cooling plate has a mounting hole. The fixing hole and the mounting hole are connected by a fastener to connect the first liquid cooling plate and the mounting bracket.

5. The expansion force testing fixture according to claim 4, characterized in that, There are multiple fixing holes, which are spaced apart along the direction perpendicular to the base. The mounting holes can be selected to achieve height-adjustable assembly.

6. The expansion force testing fixture according to claim 3, characterized in that, The support unit further includes a reinforcing member that bridges the two mounting brackets and abuts against the first liquid cooling plate.

7. The expansion force testing fixture according to claim 3, characterized in that, The base includes a substrate and a boss that are connected to each other. The bosses are symmetrically arranged on both sides of the substrate along its length. The bosses and the substrate enclose a receiving space. The second liquid cooling plate is assembled in the receiving space. The receiving space is used to store and limit the battery module.

8. The expansion force testing fixture according to claim 7, characterized in that, The thermal management unit further includes an insulating thermally conductive layer disposed on the side of the second liquid cooling plate away from the substrate, and the insulating thermally conductive layer is used for heat conduction between the insulating thermally conductive layer and the bottom surface of the battery module.

9. The expansion force testing fixture according to claim 7, characterized in that, The mounting bracket has a clearance groove on the side near the base, the clearance groove cooperates with the boss, and the mounting bracket fits against the base.

10. A pressure testing fixture according to any one of claims 2 to 9, characterized in that, The thermal management unit also includes a liquid guide pipe, which connects the first liquid cooling plate and the second liquid cooling plate.

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