Extrusion test fixing tool for cylindrical battery

Abstract

The utility model discloses a kind of extrusion test fixed tool of cylindrical battery, it is related to battery test technical field, including support frame, axial fixed component and radial fixed component, the side of support frame is provided with the axial fixed component, one end of support frame is provided with the radial fixed component;The axial fixed component includes base, clamping block and cushion block, step hole is opened in the base, the cushion block is detachably arranged in the step hole, the base is installed on the support frame, one side of the base is provided with two clamping blocks, to clamp cylindrical battery. Through the setting of axial fixed component and radial fixed component, the stable fixation of cylindrical battery in axial and radial direction is realized, the rolling and displacement of battery in extrusion test process are avoided, so accurate control extrusion pressure can be carried out, the accuracy of test result is ensured.

Description

Technical Field

[0001] This utility model relates to the field of battery testing technology, and in particular to a clamping fixture for extrusion testing of cylindrical batteries. Background Technology

[0002] Safety is a crucial consideration in the production and application of power lithium-ion batteries. The crush test, as a key testing method simulating the deformation of a battery under external force during vehicle operation or transportation, plays an irreplaceable role in evaluating battery safety performance.

[0003] Cylindrical batteries, due to their cylindrical shape, present challenges in achieving precise positioning and fixation during compression tests in different directions. Current technologies primarily utilize clamps and elastic units to hold the battery in place, facilitating compression testing. However, this fixture makes cylindrical batteries highly susceptible to rolling during compression. This not only makes precise control of the applied pressure difficult, affecting the accuracy of test results, but also significantly reduces testing efficiency and increases costs and time. Furthermore, to comprehensively evaluate battery performance during testing, it's necessary to collect voltage data and temperature data at locations such as the positive and negative terminals, the center of the large surface area, and the center of the bottom. This requires welding connecting tabs to the battery to connect voltage and temperature sensing wires. However, existing testing fixtures cannot meet this requirement; the connecting tabs easily interfere with the clamps. Without connecting tabs, the voltage and temperature sensing wires are prone to detaching during testing, severely impacting data acquisition accuracy and consequently affecting the accurate assessment of battery safety performance. Utility Model Content

[0004] The purpose of this invention is to provide a clamping fixture for extrusion testing of cylindrical batteries, in order to solve the above-mentioned technical problems.

[0005] The technical solution adopted in this utility model is as follows: A clamping fixture for extrusion testing of a cylindrical battery includes a support frame, an axial fixing component, and a radial fixing component. The axial fixing component is provided on one side of the support frame, and the radial fixing component is provided at one end of the support frame. The axial fixing assembly includes a base, a clamping block, and a pad. The base has a stepped hole, and the pad is detachably disposed in the stepped hole. The base is mounted on the support frame, and two clamping blocks are provided on one side of the base for clamping the cylindrical battery.

[0006] Preferably, the two clamping blocks are provided with semi-circular holes on their sides that are close to each other, and the two semi-circular holes form a fixing hole, which is coaxially arranged with the stepped hole.

[0007] Preferably, the base includes a mounting plate and spacers, with two clamping blocks provided on one side of the mounting plate and two spacers provided on the other side of the mounting plate, the spacers abutting against the support frame.

[0008] As a further preferred embodiment, one of the clamping blocks is fixedly connected to the mounting plate, and the two clamping blocks are connected by a connector.

[0009] Preferably, a groove is formed on one end surface of the pad.

[0010] Preferably, the radial fixing assembly includes a battery fixing block, a limiting plate, and a battery fixing mechanism. The battery fixing block is installed at one end of the support frame, and a fixing groove is provided at one end of the battery fixing block. The limiting plate is provided on one side of the battery fixing block, and the battery fixing mechanism is provided on the other side of the battery fixing block.

[0011] As a further preferred embodiment, the limiting plate is provided with a first limiting groove.

[0012] As a further preferred embodiment, the battery fixing mechanism includes a tightening block, a guide post, a spring, a connecting plate, a pressing block, and a limiting block. The tightening block is installed at one end of the support frame. The guide post is slidably disposed on the tightening block. The pressing block is disposed at one end of the guide post. The connecting plate is disposed at the other end of the guide post. The limiting block is disposed on the side of the connecting plate near the tightening block. The spring is sleeved on one end of the guide post. The spring connects the pressing block and the tightening block.

[0013] As a further preferred embodiment, the device also includes knurled screws, which are provided on the side of the connecting plate away from the tightening block, and a second limiting groove is provided on the side of the clamping block near the battery fixing block.

[0014] Preferably, the support frame includes a top plate, side plates, a support plate, and diagonal bracing plates. The upper end of the support plate is provided with a plurality of diagonal bracing plates, and the upper end of the plurality of diagonal bracing plates is provided with the top plate. The side plate is provided on one side of the top plate and the support plate. The axial fixing component is provided on the side plate, and the radial fixing component is provided on the top plate.

[0015] The above technical solution has the following advantages or beneficial effects: In this invention, the cylindrical battery is stably fixed in the axial and radial directions by setting up axial fixing components and radial fixing components, which avoids the battery rolling and shifting during the extrusion test, thereby enabling precise control of the extrusion pressure and ensuring the accuracy of the test results.

[0016] In this invention, the groove design on the pad provides suitable clearance space for the battery connecting piece, avoids interference between the connecting piece and the tooling, ensures stable connection of voltage line and temperature sensing line, and improves the accuracy of data acquisition.

[0017] In this invention, the clamping block and battery fixing mechanism facilitate the installation and removal of cylindrical batteries, allowing operators to quickly install the batteries onto the corresponding test components and reducing test preparation time.

[0018] In this invention, the adjustable clamping block and detachable pad in the axial fixing assembly, and the adjustable clamping mechanism in the radial fixing assembly, enable the tooling to adapt to cylindrical batteries of different specifications.

[0019] In this invention, the detachable design of the pad allows for testing of cylindrical batteries under different compression methods. When the pad is removed, the position of the explosion-proof valve of the cylindrical battery can be left open, allowing the explosion-proof valve to open outward, resulting in more accurate test results. When the pad is installed, it is compatible with the position of external connecting pieces, solving the problem of data acquisition accuracy. Attached Figure Description

[0020] Figure 1 This is a three-dimensional structural diagram of the extrusion test fixture for cylindrical batteries in this utility model; Figure 2 This is a side view of the extrusion test fixture for cylindrical batteries in this utility model; Figure 3 This is a schematic diagram of the axial fixing component in this utility model. Figure 1 ; Figure 4 This is a schematic diagram of the axial fixing component in this utility model. Figure 2 ; Figure 5 This is a schematic diagram of the base structure in this utility model; Figure 6 This is a schematic diagram of the structure of the pad block in this utility model; Figure 7 This is a diagram showing the usage state of the compression testing fixture for cylindrical batteries in this utility model; Figure 8 This is a schematic diagram of the connection between the cylindrical battery and the connecting piece in this utility model.

[0021] In the diagram: 1. Support frame; 101. Top plate; 102. Side plate; 103. Support plate; 104. Diagonal brace plate; 2. Axial fixing assembly; 201. Base; 202. Clamping block; 203. Pad; 204. Step hole; 205. Fixing hole; 206. Mounting plate; 207. Spacer strip; 208. Connector; 209. Groove; 210. Notch; 3. Radial fixing assembly; 301. Battery fixing block; 302. Limiting plate; 303. Battery fixing mechanism; 304. Fixing groove; 305. First limiting groove; 306. Tightening fixing block; 307. Guide post; 308. Spring; 309. Connecting plate; 310. Pressing block; 311. Limiting block; 312. Knurled screw; 313. Second limiting groove; 4. Cylindrical battery; 5. Connecting piece. Detailed Implementation

[0022] The technical solution of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this utility model.

[0023] In the description of this utility model, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this utility model and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance.

[0024] In the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0025] Figure 1 This is a three-dimensional structural diagram of the extrusion test fixture for cylindrical batteries in this utility model; Figure 2 This is a side view of the extrusion test fixture for cylindrical batteries in this utility model; Figure 3This is a schematic diagram of the axial fixing component in this utility model. Figure 1 ; Figure 4 This is a schematic diagram of the axial fixing component in this utility model. Figure 2 ; Figure 5 This is a schematic diagram of the base structure in this utility model; Figure 6 This is a schematic diagram of the structure of the pad block in this utility model; Figure 7 This is a diagram showing the usage state of the compression testing fixture for cylindrical batteries in this utility model; Figure 8 This is a schematic diagram of the connection between the cylindrical battery and the connecting piece in this utility model. Please refer to [link / reference]. Figures 1 to 8 The diagram illustrates a preferred embodiment of a cylindrical battery compression test fixture, comprising a support frame 1, an axial fixing component 2, and a radial fixing component 3. The axial fixing component 2 is located on one side of the support frame 1, and the radial fixing component 3 is located at one end of the support frame 1. In this embodiment, the support frame 1 serves as the main support for the entire fixture, providing a mounting base for the axial fixing component 2 and the radial fixing component 3. The axial fixing component 2 fixes the cylindrical battery 4 axially, facilitating subsequent axial compression testing. The radial fixing component 3 fixes the cylindrical battery 4 radially, facilitating subsequent radial compression testing. The arrangement of the axial fixing component 2 and the radial fixing component 3 effectively fixes the cylindrical battery 4 in different directions, preventing battery rolling. This allows for precise control of the compression pressure, improves the accuracy of the test results, and solves the problem that cylindrical batteries 4 are difficult to compress in different directions due to their inherent shape characteristics.

[0026] The axial fixing assembly 2 includes a base 201, clamping blocks 202, and pads 203. The base 201 has a stepped hole 204, and the pads 203 are detachably disposed within the stepped hole 204. The base 201 is mounted on a support frame 1. Two clamping blocks 202 are provided on one side of the base 201 to clamp the cylindrical battery 4. Semi-circular holes are respectively formed on the sides of the two clamping blocks 202 that are close to each other, forming a fixing hole 205. The fixing hole 205 is coaxially arranged with the stepped hole 204. In this embodiment, the size of the stepped hole 204 can be set as needed. The pads 203 are detachably disposed within the stepped hole 204, facilitating the replacement of suitable pads 203 for cylindrical batteries 4 of different sizes. The semi-circular holes on the two clamping blocks 202 are used to mate with the outer wall curvature of the cylindrical battery 4, facilitating the clamping of the cylindrical battery 4. The fixing hole 205 and the stepped hole 204 are coaxially arranged, and the cylindrical battery 4 can be tightly placed in the fixing hole 205 to achieve stable fixation in the axial direction.

[0027] The base 201 includes a mounting plate 206 and spacers 207. Two clamping blocks 202 are provided on one side of the mounting plate 206, and two spacers 207 are provided on the other side of the mounting plate 206. The spacers 207 abut against the support frame 1. The two spacers 207 are spaced apart to avoid the stepped hole 204. The spacers 207 prevent the mounting plate 206 from directly contacting the support frame 1, and the mounting plate 206 and the spacers 207 can be connected to the support frame 1 with bolts.

[0028] Furthermore, as a preferred embodiment, one clamping block 202 is fixedly connected to the mounting plate 206. The clamping block 202 is connected to one side of the mounting plate 206 by bolts, and the two clamping blocks 202 are connected by a connector 208. In this embodiment, the connector 208 is an internal hexagon screw, which connects the two clamping blocks 202 together, thereby clamping the cylindrical battery 4. The distance between the two clamping blocks 202 is adjustable to accommodate cylindrical batteries 4 of different diameters.

[0029] Furthermore, as a preferred embodiment, a groove 209 is formed on one end surface of the pad 203. In this embodiment, see... Figure 8 As shown, connecting pieces 5 are respectively provided on the positive and negative terminals at one end of the cylindrical battery 4, and the two connecting pieces 5 are at different heights and are spatially offset from each other. The slot 209 on the pad 203 avoids interference between the pad 203 and the connecting piece 5, and the slot 209 can cooperate with one of the connecting pieces 5, with the bottom wall of the connecting piece 5 contacting the bottom wall of the slot 209, while the other connecting piece 5 directly contacts one end surface of the pad 203. Notches 210 are provided on the side of the two clamping blocks 202 near the mounting plate 206, and the two connecting pieces 5 can pass through the corresponding notches 210 and extend out of the clamping blocks 202, which facilitates the connection of voltage lines and temperature sensing lines and is beneficial to accurate data acquisition.

[0030] Furthermore, as a preferred embodiment, the radial fixing assembly 3 includes a battery fixing block 301, a limiting plate 302, and a battery fixing mechanism 303. The battery fixing block 301 is mounted on one end of the support frame 1. A fixing groove 304 is provided at one end of the battery fixing block 301. The limiting plate 302 is provided on one side of the battery fixing block 301, and the battery fixing mechanism 303 is provided on the other side of the battery fixing block 301. In this embodiment, the battery fixing block 301 can be connected to one end of the support frame 1 by bolts, and the limiting plate 302 can be connected to the battery fixing block 301 by bolts. A first limiting groove 305 is provided on the limiting plate 302 for placing the connecting piece 5 on the positive and negative terminals of the battery. For details, please refer to [link to relevant documentation]. Figure 7As shown, this facilitates the extension of the connecting piece 5 out of the radial fixing component 3 and also facilitates the fixing of one end of the cylindrical battery 4. The battery fixing mechanism 303 is used to fix the other end of the cylindrical battery 4. With the setting of the limiting plate 302, the cylindrical battery 4 can be fixed in the fixing groove 304 to prevent the position of the cylindrical battery 4 from changing.

[0031] Furthermore, as a preferred embodiment, the battery fixing mechanism 303 includes a tightening fixing block 306, a guide post 307, a spring 308, a connecting plate 309, a pressing block 310, and a limiting block 311. The tightening fixing block 306 is mounted on one end of the support frame 1. The guide post 307 is slidably mounted on the tightening fixing block 306. A pressing block 310 is mounted on one end of the guide post 307, and a connecting plate 309 is mounted on the other end of the guide post 307. A limiting block 311 is provided on the side of the connecting plate 309 near the tightening fixing block 306 to limit the sliding range of the guide post 307. A spring 308 is sleeved on one end of the guide post 307, and the spring 308 connects the pressing block 310 and the tightening fixing block 306. A knurled screw 312 is provided on the side of the connecting plate 309 away from the tightening fixing block 306, and a second limiting groove 313 is formed on the side of the pressing block 310 near the battery fixing block 301. In this embodiment, the elastic force of the spring 308 can push the clamping block 310 to press against the other end of the battery, thereby fixing the cylindrical battery 4. The second limiting groove 313 is used to cooperate with the other end of the cylindrical battery 4 to limit its position; see details below. Figure 7 As shown, the knurled screws 312 facilitate the operator's pulling of the connecting plate 309 to move the clamping block 310, making it easy to adjust the position of the clamping block 310. The radial testing assembly in this embodiment solves the problems of radial fixation of the cylindrical battery 4 and the easy displacement of the battery position during testing. Through the coordinated action of the battery fixing block 301, the limiting plate 302, and the battery fixing mechanism 303, reliable radial fixation of the cylindrical battery 4 is achieved. Furthermore, the design of the guide post 307, spring 308, clamping block 310, and second limiting groove 313 can accommodate cylindrical batteries 4 of different lengths and ensure the stability of the cylindrical battery 4's position during the compression test, thereby improving the accuracy and reliability of the test.

[0032] Furthermore, in a preferred embodiment, the support frame 1 includes a top plate 101, a side plate 102, a support plate 103, and diagonal bracing plates 104. A plurality of diagonal bracing plates 104 are disposed at the upper end of the support plate 103, and the top plate 101 is disposed at the upper end of the plurality of diagonal bracing plates 104. A side plate 102 is disposed on one side of the top plate 101 and the support plate 103. An axial fixing assembly 2 is disposed on the side plate 102, and a radial fixing assembly 3 is disposed on the top plate 101. In this embodiment, the support plate 103 and the diagonal bracing plates 104 are connected by bolts, and the diagonal bracing plates 104 are fixed to the top plate 101 and the side plate 102 by bolts. The side plate 102 is fixed to the top plate 101 and the support plate 103 by bolts. The mounting plate 206 and the spacer 207 in the axial fixing assembly 2 are connected to the side plate 102 by bolts, and the battery fixing block 301 and the tightening fixing block 306 in the radial fixing assembly 3 are connected to the top plate 101 by bolts.

[0033] In use, if an axial compression test is required on the cylindrical battery 4, and the cylindrical battery 4 is compressed from the other end, then by unscrewing the connector 208, one clamping block 202 is removed. Then, one connecting piece 5 at one end of the cylindrical battery 4 is passed through the slot 209 on the pad 203 and the notch 210 on the clamping block 202, while the other connecting piece 5 rests against the surface of one end of the pad 203. The previously removed clamping block 202 is then installed, so that the two clamping blocks 202 cooperate to clamp the cylindrical battery 4, thereby axially fixing the cylindrical battery 4 and facilitating compression of the other end of the cylindrical battery 4. The protruding connecting piece 5 can be connected to external voltage and temperature sensing lines for data acquisition.

[0034] If an axial compression test is required on the cylindrical battery 4, and the cylindrical battery 4 is compressed from one end, first remove the pad 203, and then adjust the distance between the two clamping blocks 202 by loosening the connector 208. Then place the cylindrical battery 4 into the fixing hole 205 between the two clamping blocks 202, and then tighten the connector 208 so that the two clamping blocks 202 clamp the cylindrical battery 4.

[0035] When a radial compression test is required on the cylindrical battery 4, first pull the connecting plate 309 with the knurled screw 312, causing the connecting plate 309 to slide the guide post 307. The guide post 307 then moves the clamping block 310, thereby compressing the two springs 308. Next, place the cylindrical battery 4 into the fixing groove 304 on the battery fixing block 301, and place the connecting piece 5 on the cylindrical battery 4 into the first limiting groove 305 on the limiting plate 302, extending beyond the first limiting groove 305 to facilitate connection with external voltage and temperature sensing lines. Then, slowly loosen the knurled screw 312. Under the elastic force of the spring 308, the clamping block 310 moves towards the cylindrical battery 4 until it presses against the other end of the cylindrical battery 4, thus fixing the cylindrical battery 4 and facilitating radial compression of the cylindrical battery 4.

[0036] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A clamping fixture for extrusion testing of cylindrical batteries, characterized in that, It includes a support frame, an axial fixing component, and a radial fixing component. The axial fixing component is provided on one side of the support frame, and the radial fixing component is provided at one end of the support frame. The axial fixing assembly includes a base, a clamping block, and a pad. The base has a stepped hole, and the pad is detachably disposed in the stepped hole. The base is mounted on the support frame, and two clamping blocks are provided on one side of the base for clamping the cylindrical battery.

2. The compression testing fixture for cylindrical batteries as described in claim 1, characterized in that, The two clamping blocks are provided with semi-circular holes on their sides that are close to each other. The two semi-circular holes form a fixing hole, which is coaxial with the stepped hole.

3. The compression testing fixture for cylindrical batteries as described in claim 1, characterized in that, The base includes a mounting plate and spacers. Two clamping blocks are provided on one side of the mounting plate, and two spacers are provided on the other side of the mounting plate. The spacers abut against the support frame.

4. The compression test fixture for cylindrical batteries as described in claim 3, characterized in that, One of the clamping blocks is fixedly connected to the mounting plate, and the two clamping blocks are connected by a connector.

5. The extrusion test fixture for cylindrical batteries as described in claim 1, characterized in that, A groove is provided on one end surface of the pad.

6. The extrusion test fixture for cylindrical batteries as described in claim 1, characterized in that, The radial fixing assembly includes a battery fixing block, a limiting plate, and a battery fixing mechanism. The battery fixing block is installed at one end of the support frame, and a fixing groove is provided at one end of the battery fixing block. The limiting plate is provided on one side of the battery fixing block, and the battery fixing mechanism is provided on the other side of the battery fixing block.

7. The extrusion test fixture for cylindrical batteries as described in claim 6, characterized in that, The limiting plate has a first limiting groove.

8. The extrusion test fixture for cylindrical batteries as described in claim 6, characterized in that, The battery fixing mechanism includes a tightening block, a guide post, a spring, a connecting plate, a pressing block, and a limiting block. The tightening block is installed at one end of the support frame. The guide post is slidably mounted on the tightening block. The pressing block is located at one end of the guide post, and the connecting plate is located at the other end of the guide post. The limiting block is located on the side of the connecting plate near the tightening block. The spring is sleeved on one end of the guide post, and the spring connects the pressing block and the tightening block.

9. The extrusion test fixture for cylindrical batteries as described in claim 8, characterized in that, It also includes knurled screws, which are provided on the side of the connecting plate away from the tightening block, and a second limiting groove is provided on the side of the clamping block near the battery fixing block.

10. The extrusion test fixture for cylindrical batteries as described in claim 1, characterized in that, The support frame includes a top plate, side plates, a support plate, and diagonal bracing plates. The upper end of the support plate is provided with a plurality of diagonal bracing plates, and the upper end of the plurality of diagonal bracing plates is provided with the top plate. The side plate is provided on one side of the top plate and the support plate. The axial fixing component is provided on the side plate, and the radial fixing component is provided on the top plate.

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