Battery extrusion test fixture

Abstract

The application discloses a battery extrusion test tool and relates to the technical field of battery extrusion test, which comprises a bottom box, wherein a support with symmetrical sliding grooves is arranged in the bottom box, a cover is slidably connected to the two sides of the sliding grooves, a supporting plate is arranged at the lower side of the cover, one side of the supporting plate is connected to one end of a spring, a supporting table is arranged on the support, a trigger mechanism of a locking spring is connected to the lower side of the supporting table, a supporting plate is arranged on one side of the support, a clamping mechanism for clamping the upper side of a battery cell on the supporting table is arranged on the supporting plate, a supporting plate is arranged on the supporting table, a sliding block is arranged on the supporting plate, a connecting rod is slidably connected to the sliding block, a through groove is arranged on the connecting rod, and a connecting post is boltedly connected in the through groove. The battery cell of different sizes can be clamped by moving the clamping plate through the electric push rod, sliding the connecting rod on the sliding block, and adjusting the height of the connecting post by sliding the connecting post in the through groove. The explosion degree during the combustion of the battery cell is reduced by moving the cover and covering the supporting table through the spring.

Description

Technical Field

[0001] This invention relates to the field of battery compression testing technology, and more specifically to a battery compression testing fixture. Background Technology

[0002] To ensure the safety of lithium-ion batteries, a series of safety tests are conducted before the batteries leave the factory, including compression, nail penetration, and short-circuit tests. The compression test mainly simulates the safety of the power battery after deformation in the event of an accident, and has important reference value for the safety of power batteries.

[0003] During the extrusion test, as the battery deformation increases, the positive and negative current collectors are first torn and slide along the 45° failure line, and the active material also enters the 45° failure line. As the deformation of the separator continues to increase, the separator eventually reaches its failure point, causing a short circuit between the positive and negative electrodes. The short circuit caused by extrusion is mainly a point-like short circuit, which generates a very large current at the short circuit point, resulting in a concentrated release of heat and a rapid rise in temperature at the short circuit point, thus easily leading to thermal runaway.

[0004] Because there are many types of lithium-ion batteries on the market, with varying specifications and models, battery movement is a common problem during extrusion testing using an extrusion press. This can cause the extrusion block to not be aligned with the center of the battery, leading to test failure and reduced efficiency. Furthermore, battery combustion generates significant amounts of smoke and heat, which can damage the extrusion press. Therefore, a battery extrusion testing fixture is needed to address these issues. Summary of the Invention

[0005] The purpose of this invention is to provide a battery compression testing fixture to solve the above-mentioned defects caused by the prior art.

[0006] A battery compression testing fixture includes a base box, inside which a bracket is installed. The bracket has symmetrical sliding grooves, and shields are slidably connected to both sides of the sliding grooves. A support plate is installed on one side of the lower end of each shield, and one side of the support plate is connected to one end of a spring. The other end of the spring is connected to the lower bottom side of the bracket. A support platform is installed at the upper end of the bracket, located in the middle. A locking spring triggering mechanism is connected to the lower side of the support platform. A support plate is provided on one side of the bracket, and a clamping mechanism for holding the battery cell on the upper side of the support platform is provided on the support plate. A support plate is installed on the front side of the support platform, and a slider is provided on the support plate. Connecting rods are symmetrically slidably connected to the slider, and through grooves are provided on the connecting rods. A terminal is bolted into the through groove.

[0007] Preferably, the triggering mechanism includes a connecting pipe 1 connected to the bottom side of the support platform, both ends of the connecting pipe 1 being connected to a sleeve installed in the bracket, a piston being slidably connected inside the sleeve, a support rod being installed on one side of the piston, a hook block being installed at one end of the support rod to hook onto the lower edge of the support plate, a connecting pipe 2 being connected to one end of the sleeve, a one-way valve being installed on the air outlet side of the connecting pipe 2, and an air inlet side of the connecting pipe 2 being connected to an air pump.

[0008] Preferably, the clamping mechanism includes an electric push rod mounted on a support plate, the output end of which is connected to a clamping plate, and guide rods are symmetrically mounted on one side of the clamping plate, the guide rods being slidably connected to the support plate.

[0009] Preferably, a base plate is installed on the inner bottom side of the bracket, and electric push rods are installed on both sides of the base plate. A push plate is installed at the output end of the electric push rods, and the push plate pushes the cover to the trigger position.

[0010] Preferably, the bottom box has a door hinged to the front side.

[0011] Preferably, a compression block is installed at the inner top of the bottom box.

[0012] Preferably, the upper end and side wall of the shield are respectively provided with a first slot and a second slot, and the upper end of the connecting rod is threaded with a fastening bolt.

[0013] The advantages of this invention are as follows: This invention uses an electric push rod to move the clamping plate along the guide rod, and the connecting rod slides on the slider to adjust the distance between the connecting rods. The height of the terminal block is adjusted by sliding the terminal block in the through slot, thereby clamping battery cells of different sizes. The spring drives the shield to move and cover the support platform. In this way, when the battery burns, the degree of explosion during battery combustion is reduced by reducing the battery's contact with air, and the battery crushing test device can minimize the spread of dust throughout the test chamber. Attached Figure Description

[0014] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0015] Figure 2 This is a schematic diagram of the internal structure of the bottom box of the present invention.

[0016] Figure 3 , Figure 4 These are schematic diagrams of the triggering mechanism and clamping mechanism from different perspectives of the present invention.

[0017] Figure 5 This is a schematic diagram of the internal structure of the support frame of the present invention.

[0018] Figure 6This is a schematic diagram of the triggering mechanism of the present invention.

[0019] Figure 7 This is a schematic diagram of the clamping mechanism of the present invention.

[0020] The components are: 1-base box; 2-bracket; 3-slide groove; 4-cover; 5-support plate; 6-spring; 7-support platform; 8-trigger mechanism; 9-support plate; 10-battery cell; 11-clamping mechanism; 12-support plate; 13-slider; 14-connecting rod; 15-through groove; 16-terminal; 17-connecting pipe one; 18-sleeve; 19-piston; 20-support rod; 21-hook block; 22-connecting pipe two; 23-one-way valve; 24-electric push rod one; 25-clamping plate; 26-guide rod; 27-base plate; 28-electric push rod two; 29-push plate; 30-box door; 31-pressing block; 32-slot one; 33-slot two; 34-fastening bolt. Detailed Implementation

[0021] To make the technical means, creative features, objectives and effects of this invention easier to understand, the invention will be further described below in conjunction with specific embodiments.

[0022] like Figures 1 to 7 As shown, a battery compression testing fixture includes a base box 1, a bracket 2 installed inside the base box 1, symmetrical sliding grooves 3 on the bracket 2, shields 4 slidably connected to both sides of the sliding grooves 3, a support plate 5 installed on one side of the lower end of the shields 4, one side of the support plate 5 connected to one end of a spring 6, the other end of the spring 6 connected to the lower bottom side of the bracket 2, a support platform 7 installed at the upper end of the bracket 2 and in the middle position, a locking spring 6 triggering mechanism 8 connected to the lower side of the support platform 7, a support plate 9 on one side of the bracket 2, a clamping mechanism 11 for clamping the battery cell 10 on the upper side of the support platform 7, a support plate 12 installed on the front side of the support platform 7, a slider 13 on the support plate 12, connecting rods 14 symmetrically slidably connected to the slider 13, a through groove 15 on the connecting rod 14, and a terminal post 16 bolted into the through groove 15. The one-way valve 23, electric push rod 1 24 and electric push rod 28 are all electrically connected to the field power supply. The slider 13 has protrusions on both sides, which are used to hook the connecting rod 14. The terminal 16 abuts against the electrode of the battery cell 10 and detects the voltage of the battery cell 10 through an external line. A strong magnet is embedded in the contact surface of the shield 4. When the shield 4 is closed, it is attracted and closed by the strong magnet.

[0023] In this embodiment, the triggering mechanism 8 includes a connecting pipe 17 connected to the bottom side of the support platform 7. Both ends of the connecting pipe 17 are connected to a sleeve 18 installed in the bracket 2. A piston 19 is slidably connected inside the sleeve 18. A support rod 20 is installed on one side of the piston 19. A hook block 21 that hooks the lower edge of the support plate 5 is installed at one end of the support rod 20. One end of the sleeve 18 is connected to a connecting pipe 22. One-way valves 23 are installed on the air outlet sides of the connecting pipe 22. The air inlet side of the connecting pipe 22 is connected to an air pump.

[0024] In this embodiment, the clamping mechanism 11 includes an electric push rod 24 mounted on the support plate 9. The output end of the electric push rod 24 is connected to a clamping plate 25. A guide rod 26 is symmetrically mounted on one side of the clamping plate 25. The guide rod 26 is slidably connected to the support plate 9.

[0025] In this embodiment, a base plate 27 is installed on the inner bottom side of the bracket 2, and electric push rods 28 are installed on both sides of the base plate 27. A push plate 29 is installed at the output end of the electric push rods 28, and the push plate 29 pushes the cover 4 to the trigger position.

[0026] In this embodiment, a door 30 is hinged to the front side of the bottom box 1.

[0027] In this embodiment, a compression block 31 is installed at the inner top of the base box 1. The compression block 31 is pushed by a hydraulic rod installed inside the base box 1.

[0028] In this embodiment, the upper end and side wall of the shield 4 are respectively provided with a first slot 32 and a second slot 33, and the upper end of the connecting rod 14 is threadedly connected with a fastening bolt 34. The lower side of the fastening bolt 34 abuts against the slider 13.

[0029] The working principle of this invention is as follows: The battery cell 10 is placed flat on the support platform 7. The connecting rod 14 is manually pushed to slide on the slider 13, adjusting the distance between the connecting rods 14. The height of the terminal 16 is adjusted by sliding the terminal 16 within the through slot 15. Then, the length of the terminal 16 extension is adjusted using the bolts on the terminal 16. The electric push rod 24 is activated to push the clamping plate 25 along the guide rod 26 to cooperate with the terminal 16 in clamping the battery cell 10, ensuring that the extrusion block 31 can extrude the middle position of the battery cell 10. Then, the hydraulic rod is activated to push the extrusion block 31 to extrude the battery cell 10. When the battery cell 10 experiences thermal runaway due to compression, high-temperature and high-pressure gas enters the connecting pipe 17 through the support platform 7 and pushes the piston 19 inside the sleeve 18 to slide to one side. The gas is discharged from the exhaust port through the one-way valve 23, causing the hook block 21 to disengage from the support plate 5. The spring 6 contracts, causing the cover 4 to slide towards each other along the slide groove 3. After the two covers 4 come into contact, they are attracted by a strong magnet. When the cover 4 is unfolded, the electric push rod 28 pushes the push plate 29 and moves the cover 4 along the slide groove 3 to the locking position, stretching the spring 6, activating the cylinder, and pushing the piston 19 to reset so that the hook block 21 hooks the support plate 5.

[0030] This invention uses an electric push rod 24 to push the clamping plate 25 to move along the guide rod 26, and the connecting rod 14 slides on the slider 13 to adjust the distance between the connecting rods 14. The height of the terminal 16 is adjusted by sliding the terminal 16 in the through groove 15 to clamp battery cells 10 of different sizes. The spring 6 drives the cover 4 to move and cover the support platform 7. In this way, when the battery burns, the degree of explosion during the battery combustion is reduced by reducing the battery's contact with air, and the battery crushing test device can minimize the spread of dust throughout the test chamber.

[0031] As is known from common technical knowledge, this invention can be implemented through other embodiments that do not depart from its spirit or essential characteristics. Therefore, the disclosed embodiments described above are merely illustrative in all respects and are not the only ones. All modifications within the scope of this invention or its equivalents are included in this invention.

Claims

1. A battery compression testing fixture, characterized in that: Includes a base box (1), inside which a bracket (2) is installed. The bracket (2) has symmetrical sliding grooves (3). A cover (4) is slidably connected to both sides of the sliding grooves (3). A support plate (5) is installed on one side of the lower end of the cover (4). One side of the support plate (5) is connected to one end of a spring (6). The other end of the spring (6) is connected to the lower bottom side of the bracket (2). A support platform (7) is installed at the upper end of the bracket (2) and in the middle position. A locking spring (6) triggering mechanism (8) is connected to the lower side of the support platform (7). A support plate (9) is provided on one side of the bracket (2). A clamping mechanism (11) for clamping the battery cell (10) on the upper side of the support platform (7) is provided on the support plate (9). A support plate (12) is installed on the front side of the support platform (7). A slider (12) is provided on the support plate (12). 13), the slider (13) is symmetrically connected to the connecting rod (14), the connecting rod (14) is provided with a through groove (15), and the through groove (15) is bolted to the terminal (16); the triggering mechanism (8) includes a connecting pipe (17) connected to the bottom side of the support platform (7), both ends of the connecting pipe (17) are connected to the sleeve (18) installed in the bracket (2), the sleeve (18) is slidably connected to the piston (19), the piston (19) is installed with a support rod (20) on one side, the support rod (20) is installed with a hook block (21) that hooks the lower edge of the support plate (5) at one end, the sleeve (18) is connected to the connecting pipe (22) at one end, the connecting pipe (22) is installed with a one-way valve (23) on both sides of the air outlet side, and the air inlet side of the connecting pipe (22) is connected to the air pump.

2. The battery compression testing fixture according to claim 1, characterized in that: The clamping mechanism (11) includes an electric push rod (24) mounted on a support plate (9). The output end of the electric push rod (24) is connected to a clamping plate (25). A guide rod (26) is symmetrically mounted on one side of the clamping plate (25). The guide rod (26) is slidably connected to the support plate (9).

3. The battery compression testing fixture according to claim 1, characterized in that: A base plate (27) is installed on the inner bottom side of the bracket (2). Electric push rods (28) are installed on both sides of the base plate (27). A push plate (29) is installed at the output end of the electric push rods (28). The push plate (29) pushes the cover (4) to the trigger position.

4. The battery compression testing fixture according to claim 1, characterized in that: The bottom box (1) is hinged to the front side with a box door (30).

5. The battery compression testing fixture according to claim 1, characterized in that: An extrusion block (31) is installed at the inner top of the bottom box (1).

6. The battery compression testing fixture according to claim 1, characterized in that: The upper end and side wall of the shield (4) are respectively provided with a first slot (32) and a second slot (33), and the upper end of the connecting rod (14) is threaded with a fastening bolt (34).

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