Expansion force testing tool of energy storage module

Abstract

The utility model discloses an expansive force testing tool for an energy storage module. The expansive force testing tool comprises a fixing mechanism, a bottom surface liquid cooling plate, a first limiting plate, a second limiting plate, a first side liquid cooling plate and a second side liquid cooling plate, the fixing mechanism has a length direction and a width direction which are perpendicular to each other; the bottom surface liquid cooling plate is arranged on the fixing mechanism; the first limiting plate and the second limiting plate are oppositely arranged on the two sides of the fixing mechanism in the length direction. The first side liquid cooling plate and the second side liquid cooling plate are oppositely arranged on the two sides of the fixing mechanism in the width direction; wherein the bottom surface liquid cooling plate, the first limiting plate, the second limiting plate, the first side liquid cooling plate and the second side liquid cooling plate are enclosed to form an accommodating space for accommodating an energy storage module. In the testing process, the energy storage module can be stabilized within the preset range, the actual working environment can be simulated more accurately, and the accuracy of the testing result is guaranteed.

Description

Technical Field

[0001] The utility model relates to the technical field of energy storage module testing, in particular to an expansion force testing tooling for an energy storage module. Background Art

[0002] The expansion force during the storage of battery cells mainly refers to the expansion force generated by the battery cells during charging and discharging. When the battery cells undergo charge-discharge cycles, the chemical reactions inside the battery cells will cause changes in the volume of the materials inside the battery cells, thereby generating expansion force. The expansion force will cause changes in the internal stress of the battery cells, which in turn affects the safety, lifespan, and performance stability of the battery cells.

[0003] In practical applications, the problem of battery cell expansion force is particularly prominent because the expansion of battery cells may lead to the rupture of the battery cell casing, damage to the internal materials of the battery cells, and a decline in the performance of the battery cells. Especially in high-temperature and high-current working environments, the problem of battery cell expansion force is more serious. Therefore, it is of great significance to accurately understand the mechanism and influencing factors of the expansion force during the storage of battery cells and take corresponding measures to reduce or eliminate the impact of the expansion force on the battery cells.

[0004] In related technologies, in order to ensure that the temperature of the battery cells in the energy storage system is more constant and the energy density of the system is higher, an air-cooling component is often set to enhance heat exchange by increasing air flow, thereby reducing the heat generated by the expansion force of the battery cells. However, the cooling effect of the air-cooling component is greatly affected by the ambient temperature, and it may not be sufficient to meet the cooling requirements under high heat loads. Moreover, overheating of the energy storage module will cause the expansion test results to be inconsistent with the actual working conditions. Summary of the Utility Model

[0005] The main purpose of the utility model is to provide an expansion force testing tooling for an energy storage module, aiming to ensure the heat dissipation of the energy storage module and be able to more accurately test the expansion force of the energy storage module.

[0006] To achieve the above purpose, an expansion force testing tooling for an energy storage module proposed by the utility model includes a fixing mechanism, a bottom liquid cooling plate, a first limiting plate, a second limiting plate, a first side liquid cooling plate, and a second side liquid cooling plate; the fixing mechanism has a length direction and a width direction that are perpendicular to each other; the bottom liquid cooling plate is installed on the fixing mechanism; the first limiting plate and the second limiting plate are oppositely arranged on both sides of the fixing mechanism in the length direction; the first side liquid cooling plate and the second side liquid cooling plate are oppositely arranged on both sides of the fixing mechanism in the width direction; wherein, the bottom liquid cooling plate, the first limiting plate, the second limiting plate, the first side liquid cooling plate, and the second side liquid cooling plate enclose an accommodation space for accommodating the energy storage module.

[0007] In an optional embodiment of the present application, the fixing mechanism includes a base, a support member and two groups of side support structures, the bottom liquid cooling plate of the base is arranged on the base; the support member includes a guide shaft and a first end plate and a second end plate respectively fixed at both ends of the guide shaft, the first end plate and the second end plate are both fixedly connected to the base, and the guide shaft is also passed through the first limit plate and the second limit plate; and two groups of side support structures, which are relatively arranged on both sides of the base along the width direction, and the two groups of side support structures are respectively arranged on the outside of the first side liquid cooling plate and the second side liquid cooling plate, and the two groups of side support structures are respectively used to support the first side liquid cooling plate and the second side liquid cooling plate.

[0008] In an optional embodiment of the present application, the side support structure includes a reinforcing rib plate and a baffle plate, one side of the baffle plate is connected to the reinforcing rib plate, and the other side of the baffle plate facing away from the reinforcing rib plate is in contact with the first side liquid cooling plate or the second side liquid cooling plate;

[0009] The reinforcing rib plate is provided as one; or the reinforcing rib plate is provided as a plurality, and the plurality of reinforcing rib plates are fixedly arranged on the base at intervals along the length direction.

[0010] In an optional embodiment of the present application, a testing mechanism is further included, including a push plate, a first limit plate and a pressure detection device, the push plate is slidably connected to the guide shaft, the first limit plate is parallel to the push plate and is spaced apart, and is slidably connected to the guide shaft; the pressure detection device is arranged between the push plate and the first limit plate, and the pressure detection device is used to detect the expansion force of the energy storage module.

[0011] In an optional embodiment of the present application, it also includes an adjustment mechanism, which can adjust the axial position of the first limit plate on the guide shaft to adjust the size of the accommodating space. The adjustment mechanism includes: a screw and an adjustment rod, a nut connected to the first end plate; and an adjustment rod rotatably connected to the nut and connected to the push plate, and the adjustment rod drives the push plate to perform linear motion along the axial direction by rotating.

[0012] In an optional implementation manner of the present application, the adjustment mechanism further includes a handle, the handle is disposed at an end of the adjustment rod away from the push plate, and the handle is used to rotate the adjustment rod.

[0013] In an optional embodiment of the present application, the nut is fixedly connected to the first end plate via a deep groove ball bearing; and / or the push plate is slidably connected to the guide shaft via a linear bearing; and / or the first limit plate and the second limit plate are both slidably connected to the guide shaft via a linear bearing.

[0014] In an alternative embodiment of the present application, a locking bearing is sleeved on the guide shaft, and the locking bearing is located between the first limiting plate and the pushing plate.

[0015] In an alternative embodiment of the present application, the second end plate is fixedly arranged at the end of the guide shaft close to the second limiting plate, and an assembly gap is formed between the second end plate and the second limiting plate. An elastic member is arranged in the assembly gap, and the elastic member is used to apply a force to the second limiting plate away from the second end plate.

[0016] In an alternative embodiment of the present application, the elastic member is a spring, and the spring is sleeved on the guide shaft.

[0017] In an alternative embodiment of the present application, the bottom liquid cooling plate includes a liquid cooling base plate, two liquid cooling joints and two liquid cooling pipes. The liquid cooling base plate is arranged on the base, and two plug holes are formed in the end face of the liquid cooling base plate facing the assembly gap; both of the two liquid cooling joints are arranged in the assembly gap and are respectively connected to the liquid cooling base plate by brazing and sealing through the two plug holes; and the two liquid cooling pipes are respectively connected to the two liquid cooling joints and extend in a direction away from the assembly gap in a back-to-back manner. One liquid cooling pipe is connected to the first side liquid cooling plate, and the other liquid cooling pipe is connected to the second side liquid cooling plate.

[0018] In an alternative embodiment of the present application, four guide shafts are provided, and the four guide shafts are respectively connected to the four corners of the first limiting plate and the second limiting plate.

[0019] The present utility model further provides an expansion force testing tool for an energy storage module, including a fixing mechanism, a first end plate and a second end plate, a first limiting plate and a second limiting plate; the first end plate and the second end plate are oppositely arranged on two sides in the length direction; both the first limiting plate and the second limiting plate are slidably arranged between the first end plate and the second end plate. A first accommodating space is formed between the first end plate and the first limiting plate, a accommodating space for accommodating the energy storage module is formed between the first limiting plate and the second limiting plate, and a second accommodating space is formed between the second limiting plate and the second end plate; and an elastic member and a pressure sensor, one of the two is located in the first accommodating space and the other of the two is located in the second accommodating space.

[0020] In an alternative embodiment of the present application, a liquid cooling assembly is further included, and the liquid cooling assembly, the first limiting plate and the second limiting plate define the accommodating space.

[0021] The expansion force test tooling for the energy storage module proposed by the technical solution of the present utility model can absorb and transfer heat more effectively by using a liquid cooling method compared with the air cooling method in the related art. Thus, more precise control of the temperature of the energy storage module can be achieved. During the test, the energy storage module can be stabilized within the preset range, more accurately simulating the actual working environment and ensuring the accuracy of the test results.

[0022] The risk of thermal runaway can also be effectively reduced by the liquid cooling method. Under high-temperature conditions, if the heat inside the energy storage module cannot be dissipated in time, thermal runaway may occur. However, the liquid cooling plate can quickly absorb heat and prevent the battery cells from overheating.

[0023] In the expansion force test tooling of the present application, a bottom liquid cooling plate, a first side liquid cooling plate, and a second side liquid cooling plate are provided. Compared with the related art where two liquid cooling plates are provided, the present application can provide more comprehensive cooling coverage for the energy storage module, more evenly disperse the heat generated by the energy storage module, prevent local overheating, and the three liquid cooling plates can provide a more stable test environment and reduce temperature fluctuations.

[0024] By reserving the upper opening of the accommodating space in the present application, it is convenient for the installation and disassembly of the energy storage module. At the same time, it is also considered that the positive and negative electrodes at the top of the energy storage module need to be connected to other electronic components; in the length direction of the energy storage module, a large pressure needs to be borne to achieve the clamping effect. If a liquid cooling plate is provided in this direction, there may be a risk of extrusion fracture of the liquid cooling plate due to excessive pressure during the clamping process. To ensure the stability of the liquid cooling plate and the safety of the energy storage module, setting the bottom liquid cooling plate, the first side liquid cooling plate, and the second side liquid cooling plate can not only improve the reliability of the expansion test of the energy storage module but also ensure the safety during the test. Description of the Drawings

[0025] To more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following-described drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on the structures shown in these drawings.

[0026] Figure 1 It is an assembly schematic diagram of the expansion force test tooling for an embodiment of the present utility model;

[0027] Figure 2 It is a structural schematic diagram of the expansion force test tooling for an embodiment of the present utility model;

[0028] Figure 3 It is an exploded view of the structure of the expansion force test tooling for an embodiment of the present utility model;

[0029] Figure 4 It is a schematic structural diagram of another angle of the expansion force test tooling in an embodiment of the present utility model;

[0030] Figure 5 It is Figure 4 the enlarged view at position A in;

[0031] Figure 6 It is a schematic structural diagram of the expansion force test tooling in another embodiment of the present utility model;

[0032] Figure 7 It is Figure 6 the enlarged view at position B in.

[0033] Explanation of the reference numerals in the drawings: 100, expansion force test tooling; 10, fixing mechanism; 10a, accommodation space; 10b, assembly gap; 11, base; 12, support member; 121, guide shaft; 122, first end plate; 123, second end plate; 13, side support structure; 131, stiffening rib plate; 132, baffle; 14, second limiting plate; 15, deep groove ball bearing; 16, linear bearing; 17, locking bearing; 20, bottom liquid cooling plate; 21, liquid cooling base plate; 22, liquid cooling joint; 23, liquid cooling pipe; 30, first side liquid cooling plate; 40, second side liquid cooling plate; 50, test mechanism; 51, pushing plate; 52, first limiting plate; 53, pressure detection device; 60, adjusting mechanism; 61, nut; 62, adjusting rod; 621, limiting platform; 63, handle; 70, elastic member;

[0034] 200, energy storage module.

[0035] The realization, functional features and advantages of the purpose of the present utility model will be further described with reference to the embodiments and the accompanying drawings. Specific embodiments

[0036] Next, the technical solutions in the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and in no way limits the present application and its application or use. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative efforts belong to the protection scope of the present application.

[0037] References herein to "embodiments" or "implementations" mean that the particular features, structures, or characteristics described in connection with the embodiments or implementations can be included in at least one embodiment of the present application. The phrase appears in various places in the specification and does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment mutually exclusive with other embodiments. Those skilled in the art will explicitly and implicitly understand that the embodiments described herein can be combined with other embodiments.

[0038] Referring to Figures 1 to 3 , an expansion force test tooling 100 for an energy storage module 200 is provided in an embodiment of the present application. The energy storage module 200 is mainly used in fields such as energy storage systems and electric vehicles. Its core function is to connect multiple lithium-ion single-cell batteries in parallel and series, while considering issues such as the mechanical strength of the system, thermal management, and the matching of the battery management system (BMS). During the charging and discharging process of lithium-ion batteries, there will be varying degrees of expansion. On the one hand, it will affect the deformation of the battery assembly space. On the other hand, irreversible expansion accumulation will also cause structural damage to the active material, thereby accelerating capacity decay. If the expansion is large, the housing material cannot resist the expansion force, and may even cause safety problems.

[0039] Therefore, it is necessary to set up the expansion force test tooling 100 of the energy storage module 200 to help people evaluate the safety performance of the battery and provide a reference for the design and application of the battery.

[0040] In one implementation manner of the embodiment of the present application, the expansion force test tooling 100 includes a fixing mechanism 10, which not only provides necessary support for the energy storage module 200 and ensures the stability during the test process. A bottom liquid cooling plate 20 is installed on the fixing mechanism 10. By setting the bottom liquid cooling plate 20, compared with the air-cooling method in the related art, the liquid-cooling method can more effectively absorb and transfer heat, thereby achieving more precise control of the temperature of the energy storage module 200. During the test process, the energy storage module 200 can be stabilized within a preset range, more accurately simulating the actual working environment and ensuring the accuracy of the test results.

[0041] Exemplarily, the fixing mechanism 10 includes a base 11, a support member 12, and two sets of lateral support structures 13. The above-mentioned bottom liquid cooling plate 20 is disposed on the base 11. The support member 12 includes a guide shaft 121, a first end plate 122 and a second end plate 123 fixedly provided at both ends of the guide shaft 121 respectively. Both the first end plate 122 and the second end plate 123 are fixedly connected to the base 11. A first limit plate 52 and a second limit plate 14 are also slidably disposed through the guide shaft 121. The guide shaft 121 is arranged along the length direction AA, providing precise guidance for the first limit plate 52 and the second limit plate 14 provided on the guide shaft 121 to ensure smooth movement on a predetermined path. The two sets of lateral support structures 13 are oppositely disposed on both sides of the base along the width direction BB, which can enhance the structural strength of the entire expansion force test work.

[0042] In an implementation manner of the embodiment of the present application, the expansion force test tooling 100 further includes a test mechanism 50 (such as Figure 4 ), the test mechanism 50 includes a pushing plate 51, a first limit plate 52, and a pressure detection device 53. The pushing plate 51 and the first limit plate 52 are spaced apart and slidably disposed on the guide shaft 121. The pushing plate 51 is slidably connected to the guide shaft 121 through a linear bearing 16. The linear bearing 16 can provide a very low friction coefficient, making the sliding of the pushing plate 51 along the guide shaft 121 smoother. The pressure detection device 53 is disposed between the pushing plate 51 and the first limit plate 52 for detecting the expansion force of the energy storage module 200, and can provide accurate expansion force data, which is crucial for evaluating the safety and reliability of the battery cell.

[0043] In this embodiment, a second limit plate 14 is disposed at a relative position in the length direction AA of the first limit plate 52. The second limit plate 14 and the first limit plate 52 are oppositely disposed on both sides of the fixing mechanism 10 in the length direction AA. The second limit plate 14 is also slidably connected to the guide shaft 121. Both the second limit plate 14 and the first limit plate 52 are slidably connected to the guide shaft 121 through linear bearings 16. The linear bearings 16 provide a stable sliding path, which helps to prevent accidental jamming of the second limit plate 14 during the sliding process and increases the safety of the operation. Both the first limit plate 52 and the second limit plate 14 are rectangular plates for clamping the energy storage module 200 to prevent its displacement during the test. It can be understood that the sizes of the first limit plate 52 and the second limit plate 14 should be larger than the end face size of the energy storage module 200 to stably clamp the energy storage module 200.

[0044] In use, the energy storage module 200 is clamped by the first limiting plate 52 and the second limiting plate 14. On the side of the first limiting plate 52 facing away from the energy storage module 200, the above-mentioned pressure detection device 53 is installed. During the cyclic charge and discharge process, the energy storage module 200 bulges and expands, and the energy storage module 200 presses against the first limiting plate 52. The pressure detection device 53 detects the expansion force of the energy storage module 200 during the charge and discharge process. The bottom liquid cooling plate 20 is used to cool down the energy storage module 200. The bottom liquid cooling plate 20 is arranged in contact with the energy storage module 200 and can directly take away the heat of the energy storage module 200 to prevent the battery cells from overheating.

[0045] Further, compared with only two liquid cooling plates in the related art, in order to achieve more comprehensive cooling coverage of the energy storage module 200, the expansion force test tooling 100 is also provided with a first side liquid cooling plate 30 and a second side liquid cooling plate 40, which are oppositely arranged on both sides of the fixing mechanism 10 in the width direction. The first side liquid cooling plate 30 and the second side liquid cooling plate 40 are respectively fixedly connected to one side of the two groups of side support structures 13 facing the accommodating space 10a. The two groups of side support structures 13 are respectively arranged outside the first side liquid cooling plate 30 and the second side liquid cooling plate 40, and the two groups of side support structures 13 are respectively used to support the first side liquid cooling plate 30 and the second side liquid cooling plate 40. The accommodating space 10a is specifically defined by the bottom liquid cooling plate 20, the first limiting plate 52, the second limiting plate 14, the first side liquid cooling plate 30 and the second side liquid cooling plate 40. The first side liquid cooling plate 30 and the second side liquid cooling plate 40 can more evenly disperse the heat generated by the energy storage module 200, improve the cooling efficiency, help to quickly take away the heat generated by the battery cells, and prevent local overheating. The bottom liquid cooling plate, the first side liquid cooling plate 30 and the second side liquid cooling plate 40 work together to provide a more stable test environment, reduce temperature fluctuations, and improve the reliability of the test.

[0046] In specific test requirements, according to different test conditions, the energy storage module 200 may be mainly affected by heat from the bottom or the side. At this time, this condition can be simulated, and only the corresponding bottom liquid cooling plate, the first side liquid cooling plate 30 or the second side liquid cooling plate 40 is used. So that the expansion force test tooling 100 can be flexibly configured to adapt to variable test conditions and requirements and provide a customized test solution.

[0047] In this embodiment, by reserving the upper opening of the accommodating space 10a, it is convenient for the installation and disassembly of the energy storage module 200. At the same time, it is also considered that the positive and negative electrodes at the top of the energy storage module 200 need to be connected to other electronic components; in the length direction AA of the energy storage module 200, a relatively large pressure needs to be borne to achieve the clamping effect. If a liquid cooling plate is arranged in this direction, there may be a risk that the liquid cooling plate is squeezed and broken due to excessive pressure during the clamping process. To ensure the stability of the liquid cooling plate and the safety of the energy storage module 200, the bottom liquid cooling plate 20, the first side liquid cooling plate 30, and the second side liquid cooling plate 40 are set to improve the reliability of the expansion test of the energy storage module 200 and ensure safety during the test.

[0048] To achieve the stable setting of the first side liquid cooling plate 30 and the second side liquid cooling plate 40 and prevent the energy storage module 200 from expanding, the first side liquid cooling plate 30 and the second side liquid cooling plate 40 fall off from the side support structure 13, affecting the liquid cooling effect. The side support structure 13 of the embodiment of the present application includes a reinforcing rib plate 131 and a baffle 132. One side of the baffle 132 is connected to the reinforcing rib plate 131. There is one or more reinforcing rib plates 131, and the plurality of reinforcing rib plates 131 are fixedly arranged at intervals along the length direction AA and are all connected to the baffle 132. The reinforcing rib plate 131 provides additional strength and rigidity, which helps to support the baffle 132. The other side of the baffle 132 facing away from the reinforcing rib plate 131 is attached to the first side liquid cooling plate 30 or the second side liquid cooling plate 40 to ensure the fixed position of the liquid cooling plate and guarantee the stability of the positions of the first side liquid cooling plate 30 and the second side liquid cooling plate 40. A connection hole is opened on the side of the reinforcing rib plate 131 facing the accommodating space 10a, and a connecting piece is inserted into the connection hole to fix the baffle 132. The connecting piece provides a reliable connection method to ensure the firm connection between the baffle 132 and the reinforcing rib plate 131.

[0049] Exemplarily, the reinforcing rib plate 131 disclosed in this embodiment is in the shape of a triangular plate, and the two sides intersecting at 90 degrees are respectively connected to the base 11 and the baffle 132, and there are three of them. The three reinforcing rib plates 131 are arranged at intervals along the length direction AA, which helps to evenly distribute the force generated by the energy storage module 200. Among them, the number of the reinforcing rib plates 131 and the size of the baffle 132 can be adjusted according to the specific size and shape of the energy storage module 200, and there is no limitation in this application.

[0050] In one implementation manner of the embodiment of the present application, as Figure 4As shown, the expansion force test tooling 100 further includes an adjustment mechanism 60. The adjustment mechanism 60 can adjust the axial position of the first limiting plate 52 on the guide shaft 121 to adjust the size of the accommodation space 10a so as to realize the firm clamping of the energy storage module 200. Specifically, the adjustment mechanism 60 includes a nut 61 and an adjustment rod 62. Among them, the first end plate 122 is fixed to the end of the guide shaft 121, located on the side of the push plate 51 away from the first limiting plate 52. The first limiting plate 52 is fixedly connected to the push plate 51. The nut 61 is connected to the first end plate 122. Among them, the nut 61 is fixedly connected to the first end plate 122 through a deep groove ball bearing 15. The structure of the deep groove ball bearing 15 helps to maintain the stability of the adjustment mechanism 60 and can maintain performance even in heavy load or vibration environments. The thread has an internal thread, and the adjustment rod 62 has an external thread to realize the threaded connection between the adjustment rod 62 and the first end plate 122. The adjustment rod 62 is rotatably connected to the nut 61 and connected to the push plate 51. The adjustment rod 62 drives the push plate 51 to move linearly along the axis by rotating in the nut 61.

[0051] Exemplarily, a limiting platform 621 is provided at the end of the adjustment rod 62 connected to the push plate 51. The limiting platform 621 abuts against and drives the push plate 51 to slide along the guide shaft 121. According to the structural dimensions of the energy storage module 200, the adjustment rod 62 is rotated so that the first limiting plate 52 and the push plate 51 move toward or away from the side of the second limiting plate 14. The adjustment rod 62 is directly connected to the push plate 51 and can drive the first limiting plate 52 to move. While meeting the adjustment requirements, the flatness of the first limiting plate 52 is ensured, and the accuracy of the measurement results is provided.

[0052] A locking bearing 17 is provided between the push plate 51 and the first limiting plate 52. The locking bearing 17 is sleeved on the guide shaft 121. The locking bearing 17 can ensure the fixation of the push plate 51 and the first limiting plate 52. In actual use, the locking bearing 17 is loosened, and the linear bearing 16 can move along the direction of the guide shaft 121 to adjust the size of the accommodation space 10a. After the adjustment is in place, the locking bearing 17 is locked. At this time, the linear bearing 16 is fixed relative to the guide shaft 121, and the energy storage module 200 is firmly clamped.

[0053] In an implementation manner of the embodiment of the present application, the adjustment mechanism 60 further includes a handle 63. The handle 63 is arranged at the end of the adjustment rod 62 away from the push plate 51, and the handle 63 is arranged at a 90-degree angle to the adjustment rod 62. The handle 63 is used to rotate the adjustment rod 62. The handle 63 is convenient for the user to hold and can adjust more labor-saving.

[0054] In one implementation of the embodiment of the present application, since both ends of the battery cell module are clamped by the first limiting plate 52 and the second limiting plate 14, during the charging process, the battery cell expands and is over-extended, which may cause explosion risk. Therefore, an elastic member 70 is also provided. A second end plate 123 is fixedly provided at the end of the guide shaft 121 close to the second limiting plate 14, and an assembly gap 10b is formed between the second end plate 123 and the second limiting plate 14. The above-mentioned elastic member 70 is installed in the assembly gap 10b. The elastic member 70 is used to apply a force away from the second end plate 123 to the second limiting plate 14. The elastic member 70 can make the second limiting plate 14 better fit the battery cell, and the expansion force can be fed back in real time, and the test result is better. When the energy storage module 200 is over-expanded, the elastic member 70 allows the second limiting plate 14 to have a certain amount of movement space toward the second end plate 123 to reduce mechanical stress.

[0055] In actual use, the influence of the elastic member 70 on the test results can be dealt with by means of testing. Before the test begins, after the energy storage module 200 is installed, the initial value of the expansion force is recorded. This initial value is caused by the prestress of the elastic member 70. At the end of the test, the initial value is subtracted from the measured total expansion force to obtain the actual expansion force generated by the battery cell during the charge and discharge process.

[0056] For example, the elastic member 70 is a spring, which is sleeved on the guide shaft 121. The spring provides an additional safety guarantee to ensure the safety of the tester and the equipment. Figure 5 ) The spring can provide a force for the second limit plate 14 to move away from the second end plate 123, so that the second limit plate 14 generates a pre-tightening force to clamp and squeeze the energy storage module 200, ensuring that the energy storage module 200 is stably fixed in place under normal working conditions. Figure 7 ), the energy storage module 200 squeezes the second limiting plate 14 to cause the spring to contract. The compression of the spring can serve as a buffer to reduce the impact of the energy storage module 200 on the second limiting plate 14 and prevent accidents.

[0057] Compared with other non-spring elastic structures such as springs, the spiral shape of the spring is easier to install on the guide shaft 121, and the manufacturing process of the spring is relatively simple, and it can be mass-produced, so the cost is low. The spring can maintain a relatively constant elastic coefficient when subjected to force, and the spring material also has a good fatigue life, can withstand multiple extrusions without breaking, and has a compact structure, which can provide the required elastic force in a limited space, which helps to ensure the stable performance of the expansion force test fixture 100.

[0058] like Figure 4 and Figure 6As shown, a liquid cooling joint 22 and a liquid cooling pipe 23 are also arranged within the assembly gap 10b. The bottom liquid cooling plate 20 includes a liquid cooling substrate 21, two liquid cooling joints 22, and two liquid cooling pipes 23. The liquid cooling substrate 21 is disposed on the base 11. Two insertion holes are formed on the end face of the liquid cooling substrate 21 facing the assembly gap 10b. The two liquid cooling joints 22 are respectively and hermetically connected to the liquid cooling substrate 21 by soldering through the two insertion holes to achieve sealing by soldering. The two liquid cooling pipes 23 are respectively connected to the two liquid cooling joints 22 and extend away from the assembly gap 10b in a back-to-back manner. One liquid cooling pipe 23 is connected to the first-side liquid cooling plate 30, and the other liquid cooling pipe 23 is connected to the second-side liquid cooling plate 40. The integrated design of the liquid cooling joint 22 and the liquid cooling pipe 23 reduces external connection points, helps to achieve a compact layout of the liquid cooling module, and optimizes space utilization.

[0059] Among them, both the first-side liquid cooling plate 30 and the second-side liquid cooling plate 40 include a plate body and a liquid cooling connector. The two liquid cooling connectors are respectively connected to the two liquid cooling pipes 23, allowing the coolant to be evenly distributed in the bottom liquid cooling plate 20, the first-side liquid cooling plate 30, and the second-side liquid cooling plate 40, and forming a closed coolant circulation loop to ensure that the coolant can circulate continuously to achieve comprehensive cooling. When there are special test requirements, the expansion force test requirements of the side liquid cooling and bottom liquid cooling modules can be met by closing the liquid cooling joint 22 or the liquid cooling connector.

[0060] Exemplarily, both the liquid cooling substrate 21 and the plate body have liquid flow channels, and the liquid flow channels are arranged in an S-shaped bend. The S-shaped arranged flow channels increase the surface area of contact between the coolant and the liquid cooling substrate 21 or the plate body, thereby improving the heat exchange efficiency.

[0061] In an implementation manner of the embodiment of the present application, four guide shafts 121 are provided, and the four guide shafts 121 are respectively connected to the four corners of the first limiting plate 52 and the second limiting plate 14. The four guide shafts 121 provide uniform support for the first limiting plate 52 and the second limiting plate 14, maintaining the stability of the first limiting plate 52 and the second limiting plate 14 during the test and reducing distortion or skew caused by the expansion force during the test. The end portions of the four guide shafts 121 are respectively connected to the four corners of the first end plate 122 and the second end plate 123, maintaining a uniform distribution of force, reducing structural deformation caused by asymmetric loads, and enhancing the overall stability of the expansion force test tooling 100.

[0062] In an implementation manner of the embodiment of the present application, the expansion force test tooling 100 further includes an air cooling module. The air cooling module refers to a module without a liquid cooling system and with normal natural heat dissipation, that is, the expansion force test tooling 100 is compatible with the air cooling method and the liquid cooling method to adapt to different test requirements and conditions. It can either use the liquid cooling system for efficient cooling or switch to the air cooling method when needed.

[0063] The above are only the preferred embodiments of the present utility model, and thus do not limit the patent scope of the present utility model. Any equivalent structural transformation made under the inventive concept of the present utility model by using the content of the specification and drawings of the present utility model, or any direct / indirect application in other related technical fields shall be included within the patent protection scope of the present utility model.

Claims

1. An expansion force testing tool for an energy storage module, characterized in that: include: The fixing mechanism has a length direction and a width direction that are perpendicular to each other; A bottom liquid cooling plate, mounted on the fixing mechanism; A first limiting plate and a second limiting plate are arranged opposite to each other on both sides of the fixing mechanism in the length direction; and A first side liquid cooling plate and a second side liquid cooling plate are arranged opposite to each other on both sides of the fixing mechanism in the width direction; The bottom liquid cooling plate, the first limiting plate, the second limiting plate, the first side liquid cooling plate and the second side liquid cooling plate are enclosed to form an accommodating space for accommodating the energy storage module.

2. The expansion force testing tool for the energy storage module according to claim 1, characterized in that: The fixing mechanism comprises: A base, wherein the bottom liquid cooling plate is arranged on the base; A support member, comprising a guide shaft and a first end plate and a second end plate respectively fixed at both ends of the guide shaft, wherein the first end plate and the second end plate are both fixedly connected to the base, and the guide shaft is also passed through the first limit plate and the second limit plate; and Two groups of side support structures are arranged on both sides of the base relatively along the width direction, and the two groups of side support structures are respectively arranged on the outer sides of the first side liquid cooling plate and the second side liquid cooling plate, and the two groups of side support structures are respectively used to support the first side liquid cooling plate and the second side liquid cooling plate.

3. The expansion force testing tool for the energy storage module according to claim 2, characterized in that: The side support structure includes a reinforcing rib plate and a baffle plate, one side of the baffle plate is connected to the reinforcing rib plate, and the other side of the baffle plate facing away from the reinforcing rib plate is in contact with the first side liquid cooling plate or the second side liquid cooling plate; The reinforcing rib plate is provided as one; or The reinforcing rib plates are provided in plurality, and the plurality of reinforcing rib plates are fixedly arranged on the base at intervals along the length direction.

4. The expansion force testing tool for the energy storage module according to claim 2, characterized in that: Also included is a testing facility, the testing facility comprising: A push plate, slidably connected to the guide shaft; The first limiting plate is parallel to and spaced from the pushing plate and is slidably connected to the guide shaft; and The pressure detection device is arranged between the pushing plate and the first limiting plate.

5. The expansion force testing tool for the energy storage module according to claim 4, characterized in that: It also includes an adjustment mechanism, which can adjust the axial position of the first limiting plate on the guide shaft to adjust the size of the accommodating space, and the adjustment mechanism includes: a nut connected to the first end plate; and The adjusting rod is rotatably connected in the nut and connected to the pushing plate. The adjusting rod drives the pushing plate to perform linear motion along the axial direction by rotating.

6. The expansion force testing tool for the energy storage module according to claim 5, characterized in that: The adjusting mechanism further comprises a handle, which is arranged at the end of the adjusting rod away from the pushing plate, and is used for rotating the adjusting rod.

7. The expansion force testing tool according to claim 5, characterized in that: The nut is fixedly connected to the first end plate via a deep groove ball bearing; and / or The push plate is slidably connected to the guide shaft via a linear bearing; and / or The first limiting plate and the second limiting plate are both slidably connected to the guide shaft via linear bearings.

8. The expansion force testing tool for the energy storage module according to any one of claims 5 to 7, characterized in that: A locking bearing is sleeved on the guide shaft, and the locking bearing is located between the first limiting plate and the pushing plate.

9. The expansion force testing tool for the energy storage module according to any one of claims 5 to 7, characterized in that: The second end plate is fixed to the end of the guide shaft close to the second limit plate, and an assembly gap is formed between the second end plate and the second limit plate. An elastic member is installed in the assembly gap, and the elastic member is used to apply a force to the second limit plate away from the second end plate.

10. The expansion force testing tool for the energy storage module according to claim 9, characterized in that: The elastic member is a spring, and the spring is sleeved on the guide shaft.

11. The expansion force testing tool for the energy storage module according to claim 9, characterized in that: The bottom liquid cooling plate comprises: A liquid cooling substrate is arranged on the base, and the end surface of the liquid cooling substrate facing the assembly gap is provided with two plug holes; Two liquid cooling joints are both arranged in the assembly gap and are respectively brazed and sealed to the liquid cooling base plate through the two plug holes; and Two liquid cooling pipes are respectively connected to the two liquid cooling joints and extend in a direction away from the assembly gap. One of the liquid cooling pipes is connected to the first side liquid cooling plate, and the other liquid cooling pipe is connected to the second side liquid cooling plate.

12. The expansion force testing tool for the energy storage module according to claim 2, characterized in that: Four guide shafts are provided, and the four guide shafts are respectively connected to four corners of the first limiting plate and the second limiting plate.

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