Battery cell cycle test tool
By designing a battery cell cycle test fixture with a splint to clamp the battery cell and equipped with compressed foam and heat dissipation components, the problems of insufficient simulated force and heat dissipation in the existing technology are solved, and the accurate prediction and extension of the battery cell life are achieved.
Patent Information
- Application Number
- CN202421942018.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-08-09
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-08-09
AI Technical Summary
Existing battery cell cycle test tooling cannot accurately simulate the stress conditions of battery cells when used in modules, resulting in large differences between test results and actual service life. It also lacks effective heat dissipation performance and cannot accurately predict the actual service life of battery cells.
A battery cell cycle test fixture was designed. It uses a splint to clamp the battery cell and applies an adjustable clamping force through connecting components. It combines compressed foam to reserve expansion space and is equipped with heat dissipation components to increase the heat dissipation area to simulate the stress and heat dissipation conditions of the battery cell in the module.
It achieves accurate simulation of the stress and heat dissipation of the battery cell, extends the cycle life of the battery cell, improves the accuracy of the test results, and can effectively predict the actual service life of the battery cell.
Smart Images
Figure CN223389870U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of battery testing, in particular to a battery cell cycle testing tool. Background Art
[0002] Batteries, as energy storage units, are increasingly being used in the electric vehicle and energy storage industries. Battery packaging designs are categorized into three types: square, soft-pack, and cylindrical. Square cells can swell on their large surfaces after cycling, which can easily cause the cell capacity to drop. To this end, when cells are packed into modules, a certain amount of pressure is applied to the large surfaces of the cells to clamp them, and gaps are left between the large surfaces of the cells, filled with foam or instant noodles to create expansion gaps and provide a flame retardant effect. Currently, the commonly used cycle test tooling in the industry only has a clamping function, which differs significantly from the actual force changes on the cells in the module. Therefore, the test results cannot effectively predict the actual service life of the cells. Utility Model Content
[0003] In view of the shortcomings of the existing technology, the purpose of the present invention is to provide a battery cell cycle test tool that can accurately simulate the stress conditions of the battery cell when used in the module, has good heat dissipation performance, and can effectively predict the actual service life of the battery cell.
[0004] In order to achieve the above purpose, the present invention is implemented through the following technical solutions:
[0005] The embodiment of the present utility model provides a battery cell cycle test tool, comprising:
[0006] Clamping plates are provided in pairs for clamping the battery cells, and each pair of clamping plates is connected by a connecting component;
[0007] Heat dissipation components, with multiple heat dissipation components provided between each pair of clamping plates, each heat dissipation component having a battery cell contact surface, with both ends of the battery cell contact surface being connected to a plurality of heat dissipation surfaces;
[0008] Compressed foam is attached to the inner surface of the splint, and the compressed foam is used to reserve expansion space for the battery core.
[0009] As a further implementation, the number of the heat dissipation surfaces is 2n, where n is an integer ≥1.
[0010] As a further implementation, both ends of the battery cell contact surface are provided with one or more heat dissipation surfaces;
[0011] When there is one heat dissipation surface, it is perpendicular to the contact surface of the battery core; when there are multiple heat dissipation surfaces, the heat dissipation surfaces are arranged crosswise.
[0012] As a further implementation, through holes for connecting components to pass through are provided near both ends of the contact surface of the battery cell.
[0013] As a further implementation, the width of the battery cell contact surface is consistent with the battery cell width, and the length of the battery cell contact surface is greater than the battery cell length.
[0014] As a further implementation, the heat dissipation component has a thickness of 0.1-5 mm.
[0015] As a further implementation, the heat dissipation component is made of metal or alloy.
[0016] As a further implementation, the splints are connected by a plurality of screws, one end of the screw has a base, and the other end is provided with a gasket and a nut.
[0017] As a further implementation, the compression amount of the compressed foam is 0-70%, and the thickness is 0.5-2 mm.
[0018] As a further implementation, the clamping plate is made of metal or alloy with a thickness of 5-20 mm and a clamping force that meets the set yield strength.
[0019] The beneficial effects of the utility model are as follows:
[0020] (1) The utility model clamps the battery cell by means of a clamping plate, and the clamping force can be flexibly designed according to the torque of the bolt. At the same time, the utility model has a gap made of compressed foam to meet the space requirements of the battery cell in the later stage of the cycle, and accurately simulates the stress conditions of the battery cell when used in the module; it also contains a heat dissipation component with good heat dissipation performance to avoid heat accumulation during the battery cell cycle, which leads to a drop in cycle life.
[0021] (2) The heat dissipation component of the present invention includes a battery cell contact surface and a heat dissipation surface, which can increase the heat dissipation area; at the same time, the number of heat dissipation surfaces can be changed according to actual heat dissipation requirements to meet the requirements of different batteries; wherein the width of the battery cell contact surface is consistent with the width of the battery cell, and the length of the battery cell contact surface is greater than the length of the battery cell, so that the screw and the heat dissipation surface do not interfere with the edge of the battery cell. BRIEF DESCRIPTION OF THE DRAWINGS
[0022] The drawings in the specification, which constitute a part of the present invention, are used to provide a further understanding of the present invention. The illustrative embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation on the present invention.
[0023] Figure 1 This is a schematic diagram of a test fixture structure according to one or more embodiments of the present invention;
[0024] Figure 2 This is a schematic structural diagram of a heat dissipation component according to one or more embodiments of the present invention;
[0025] Figure 3(a)-Figure 3(c)is a top view of a heat dissipation component according to one or more embodiments of the present invention;
[0026] Among them, 1. heat dissipation component, 101. battery cell contact surface, 102. through hole, 103. heat dissipation surface; 2. compressed foam, 3. splint, 4. screw, 5. nut, 6. gasket. DETAILED DESCRIPTION
[0027] Example 1:
[0028] The utility model provides a battery cycle test tool, such as Figure 1 As shown, it includes a splint 3, a heat dissipation component 1, and compressed foam 2. The splints 3 are arranged in pairs and are used to clamp the battery cells; the heat dissipation component 1 is used to dissipate heat from the battery cells during the test; and the compressed foam 2 is used to create gaps to meet the space requirements of the battery cells in the later stages of the cycle.
[0029] Each pair of clamps 3 has two clamps, and one or more battery cells can be placed between the two clamps. In this embodiment, a pair of clamps 3 is used for detailed description. It should be noted that when a large number of battery cells are tested simultaneously, considering the clamping force requirements, multiple pairs of clamps 3 can be provided, with multiple battery cells placed between each pair of clamps 3.
[0030] like Figure 1 As shown, the two clamping plates 3 are parallel to each other, and the shape of the clamping plates 3 can be set arbitrarily. In this embodiment, in order to adapt to the shape of the battery core, the clamping plates 3 are rectangular plates.
[0031] The clamping plates 3 are connected by a connecting member. To adjust the clamping force, the connecting member in this embodiment uses a screw 4. The two clamping plates 3 are connected by multiple screws 4, and the clamping force is provided by tightening the screws 4. The number of screws 4 can be two, four, or more, depending on the actual clamping force required.
[0032] Clamping plate 3 has through-holes near the four corners for screws 4 to maximize the space for battery cells. Screws 4 enter through-holes in one clamping plate 3 and exit through holes in the other. To facilitate tightening, a base is provided at one end of screw 4. This base can be circular, or polygonal, such as a quadrilateral or hexagon. The base's cross-section must be larger than the cylindrical surface of screw 4 to prevent it from passing through the through-holes in clamping plate 3, facilitating tightening from the other end of screw 4. The other end of screw 4 is secured by a washer 6 and then a nut 5.
[0033] The material of the clamping plate 3 is any metal or alloy such as stainless steel, copper, iron, etc., with a thickness of 5-20 mm and a yield strength that meets the clamping force of >1.2 Max. In this embodiment, the clamping plate 3 is distributed with four through holes, the size of the through holes being consistent with the cross section of the screw 4 for passing the screw 4.
[0034] Compressed foam 2 is attached to the inner surface of clamping plate 3, avoiding the through-holes for mounting screws 4. Corresponding through-holes can be provided in the compressed foam 2 to allow screws 4 to pass through. This allows for expansion of the cell during later cycles, accurately simulating the stress changes experienced by the prismatic cell during battery pack cycling.
[0035] The compressed foam 2 is a heat-insulating and flame-retardant material made of polyolefin as the main raw material and a foaming agent. It also has a certain compressibility, with a compression amount of 0-70% and a thickness of 0.5-2 mm.
[0036] Heat dissipation components 1 prevent heat accumulation caused by compressed foam insulation 2, which could lead to excessive core temperature spikes during cycling. Heat dissipation components 1 are located on both sides of the battery cell. These components can be made of any metal or alloy, such as stainless steel, copper, or iron, and have a thickness of 0.1-5mm. They provide both thermal conductivity and heat dissipation.
[0037] The heat dissipation component 1 of this embodiment includes a battery cell contact surface 101 and a heat dissipation surface 103. The battery cell contact surface 101 is a sheet-like structure in contact with the battery cell, and one or more heat dissipation surfaces 103 are connected to each of its two ends. Heat is transferred to the heat dissipation surfaces 103 at both ends through the battery cell contact surface 101 to dissipate the heat, thereby increasing the area of the heat dissipation surface 103.
[0038] The total number of heat dissipation surfaces 103 is 2n, where n is an integer ≥ 1. The included angle between the heat dissipation surface 103 and the cell contact surface 101 can be any angle. The specific number of heat dissipation surfaces 103 is selected according to actual heat dissipation requirements.
[0039] When both ends of the cell contact surface 101 are connected to a heat dissipation surface 103, as shown in FIG. Figure 2 As shown, the heat dissipation surface 103 is perpendicular to the battery cell contact surface 101 , forming an I-shaped structure.
[0040] When there are multiple heat dissipation surfaces 103, the heat dissipation surfaces 103 are arranged in a cross pattern. For example, as shown in FIG3(a), two heat dissipation surfaces 103 are connected to each end of the battery cell contact surface 101, one of which is perpendicular to the battery cell contact surface 101, and the other heat dissipation surface 103 is connected to the end of the battery cell contact surface 101. The two heat dissipation surfaces 103 form a cross structure at the end of the battery cell contact surface 101. As shown in FIG3(b), three heat dissipation surfaces 103 are connected to each end of the battery cell contact surface 101, one of which is perpendicular to the battery cell contact surface 101, and the remaining two heat dissipation surfaces 103 are arranged symmetrically with respect to the vertical heat dissipation surfaces 103. As shown in FIG3(c), four heat dissipation surfaces 103 are connected to each end of the battery cell contact surface 101, and one heat dissipation surface 103 is added to the three heat dissipation surfaces 103, which is connected to the end of the battery cell contact surface 101.
[0041] The cell contact surface 101 is provided with a through hole 102 corresponding to the clamping plate 3. The through hole 102 can be any shape, such as circular or elliptical, as long as it can pass through the screw 4. In this embodiment, the cell contact surface 101 is rectangular, with a through hole at each of its four corners. The width of the cell contact surface 101 is consistent with the width of the cell, and the length of the cell contact surface 101 is greater than the length of the cell, so that the screw 4 and the heat dissipation surface 103 do not interfere with the edge of the cell.
[0042] The assembly process of the battery cell cycle test fixture in this embodiment is as follows:
[0043] Center one side of the compressed foam 2 on the inner surface of the plywood 3 with double-sided tape. Thread four screws 4 through one of the plywoods 3, with the base of the screws 4 aligned with the outer surface of the plywood 3. Place a heat sink 1 on the other side of the compressed foam 2, with the screws 4 extending through it. Insert the battery cell so that one of its large surfaces contacts the cell contact surface 101 of the heat sink 1. Add the heat sink 1 and another plywood 3 with compressed foam 2 attached to the other large surface of the cell. Tighten all components, and sequentially add a washer 6 and a nut 5 to the end of each screw 4 away from the base. Tighten the nut 5 with a torque wrench to tighten the plywood 3 until the set torque is reached.
[0044] The battery cell cycling test fixture of this embodiment not only has a clamping function that can simulate the stress conditions of the battery cell in the module, but also has a gap-creating component (compressed foam 2) that continuously compresses as the battery cell expands after cycling, extending the cycle life of the battery cell. Finally, it also has a heat dissipation component 1 to prevent heat accumulation during the battery cell cycle, which can cause a drop in cycle life. Therefore, the test results of the battery cell cycling test fixture of this embodiment can effectively predict the actual service life of the battery cell.
[0045] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Various modifications and variations are possible for those skilled in the art. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.
Claims
1. A battery cell cycle test tool, characterized in that: include: Clamping plates are provided in pairs for clamping the battery cells, and each pair of clamping plates is connected by a connecting component; Heat dissipation components, with multiple heat dissipation components provided between each pair of clamping plates, each heat dissipation component having a battery cell contact surface, with both ends of the battery cell contact surface being connected to a plurality of heat dissipation surfaces; Compressed foam is attached to the inner surface of the splint, and the compressed foam is used to reserve expansion space for the battery core.
2. A battery cell cycle test fixture according to claim 1, characterized in that: The number of the heat dissipation surfaces is 2n, where n is an integer ≥1.
3. A battery cell cycle test fixture according to claim 1 or 2, characterized in that: The two ends of the battery cell contact surface are respectively provided with one or more heat dissipation surfaces; When there is one heat dissipation surface, it is perpendicular to the contact surface of the battery core; when there are multiple heat dissipation surfaces, the heat dissipation surfaces are arranged crosswise.
4. The battery cell cycle test fixture according to claim 1, characterized in that: The battery cell contact surface is provided with through holes near both ends for connecting components to pass through.
5. A battery cell cycle test fixture according to claim 1 or 4, characterized in that: The width of the battery cell contact surface is consistent with the battery cell width, and the length of the battery cell contact surface is greater than the battery cell length.
6. The battery cell cycle test fixture according to claim 1, characterized in that: The thickness of the heat dissipation component is 0.1-5 mm.
7. A battery cell cycle test fixture according to claim 1 or 6, characterized in that: The heat dissipation component is made of metal or alloy.
8. The battery cell cycle test fixture according to claim 1, characterized in that: The clamping plates are connected by a plurality of screw rods, one end of the screw rod is provided with a base, and the other end is provided with a gasket and a nut.
9. The battery cell cycle test fixture according to claim 1, characterized in that: The compression amount of the compressed foam is 0-70%, and the thickness is 0.5-2 mm.
10. The battery cell cycle test fixture according to claim 1, characterized in that: The clamping plate is made of metal or alloy, has a thickness of 5-20 mm, and meets the clamping force of the set yield strength.