Battery test fixture

Abstract

The utility model discloses a battery test fixture, which belongs to the technical field of battery test equipment, and comprises a lower clamping body and an upper clamping body, the lower clamping body and the upper clamping body are rotatably connected through a first shaft core, the outer surface of the first shaft core is sleeved with a torsion spring, the torsion spring is located between the lower clamping body and the upper clamping body, and the torsion spring is connected with the lower clamping body through a spring. The lower clamping body comprises a first fixing base, a voltage piece is arranged at the top end of the first fixing base, the top end of the voltage piece is arranged in a blade shape, a current piece is arranged on the upper surface of the voltage piece, and a plurality of blades with the same size are arranged on the upper surface of the current piece. A clamping groove is formed in the end part of the second fixing seat, an elastic sheet is inserted and fixed in an inner cavity of the clamping groove, and an extrusion structure is arranged at the other end of the elastic sheet, so that the clamping effect of the battery test fixture on a battery tab is improved, the contact performance of the battery tab and a fixture conductor is improved, and the stability in the test process is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of battery testing equipment, and particularly relates to a battery testing fixture. Background Technique

[0002] A battery refers to a part of a cup, trough or other container or composite container that contains an electrolyte solution and metal electrodes to generate current, and is a device that can convert chemical energy into electrical energy. During the production and preparation process or testing of tabular batteries (such as soft-pack batteries), a testing fixture is required to connect the tabs of the battery for formation, grading, and detection of the battery.

[0003] For the existing testing fixture, after the upper clamping body clamps the tab, it does not have a yielding function, resulting in gaps after clamping. At the same time, the current sheet on the lower clamping body is usually set in a V-groove shape, so that the current sheet cannot pierce the oxide film on the surface of the battery electrode plate, resulting in a decrease in conductive efficiency. As a result, the clamping effect of the battery testing fixture on the battery tab decreases, and the contact performance between the battery tab and the conductive body of the fixture is poor, affecting the stability of the testing process.

[0004] A lithium-ion battery testing fixture provided according to the publication number: CN215678469U relates to the technical field of lithium battery testing auxiliary tools; it includes a testing substrate and a plurality of fixture bodies slidably arranged on the testing substrate along the length direction of the testing substrate; the fixture body includes a clamping end and a movable end away from the clamping end, and the clamping end is close to the battery to be tested and is used to clamp the tab of the battery to be tested; a limiting chute is opened on the testing substrate, and a limiting slider adapted to the limiting chute is arranged at the bottom of the fixture body, and the limiting slider slides on the testing substrate along the limiting chute; the clamping end is provided with a conductive block electrically connected to the tab, and the conductive block is connected with a wire; adopting the technical solution provided by this application solves the technical problems that the wire harnesses of the existing lithium-ion battery testing fixture are messy and not easy to organize, resulting in inconvenient subsequent testing and low safety.

[0005] According to the above-introduced battery testing fixture, after the upper clamping body clamps the tab, it does not have a yielding function, resulting in gaps after clamping. At the same time, the current sheet on the lower clamping body is usually set in a V-groove shape, so that the current sheet cannot pierce the oxide film on the surface of the battery electrode plate, resulting in a decrease in conductive efficiency. As a result, the clamping effect of the battery testing fixture on the battery tab decreases, and the contact performance between the battery tab and the conductive body of the fixture is poor, affecting the stability of the testing process. Therefore, we need to propose a battery testing fixture. Content of the Utility Model

[0006] The purpose of the present utility model is to provide a battery test fixture. Through the cooperation of elastic pieces with a yielding effect, when the fixture clamps the battery electrode tab, the effective area of contact between the battery electrode tab and the current sheet on the lower clamping body can be ensured. Through the blade-shaped settings of the voltage sheet and the current sheet, the blade can pierce the oxide film on the surface of the battery electrode tab to maintain the optimal conductivity; and the blade can bite the battery electrode tab to make the clamping of the battery electrode tab by the fixture more stable, thereby improving the clamping effect of the battery test fixture on the battery electrode ear, increasing the contact performance between the battery electrode ear and the conductive body of the fixture, and enhancing the stability during the test process to solve the problems raised in the above background technology.

[0007] To achieve the above object, the present utility model provides the following technical solution: A battery test fixture includes a lower clamping body and an upper clamping body. The lower clamping body and the upper clamping body are rotationally connected through a first shaft core. A torsion spring is sleeved on the outer surface of the first shaft core, and the torsion spring is located between the lower clamping body and the upper clamping body. The lower clamping body includes a first fixed seat. A voltage sheet is provided at the top of the first fixed seat. The top of the voltage sheet is arranged in a blade shape. A current sheet is provided on the upper surface of the voltage sheet. A plurality of blades of the same size are arranged on the upper surface of the current sheet. The voltage sheet and the current sheet are both fixed on the upper surface of the first fixed seat by rivets. The upper clamping body includes a second fixed seat. A slot is opened at the end of the second fixed seat. An elastic piece is inserted and fixed in the inner cavity of the slot. The other end of the elastic piece is provided with an extrusion structure for pressing the battery electrode tab.

[0008] Preferably, an avoidance position is opened on the upper surface of the first fixed seat, and the avoidance position is arranged directly below the voltage sheet.

[0009] Preferably, an insulating sheet is provided at the top of the first fixed seat, and the insulating sheet is located between the voltage sheet and the current sheet. The cross-section of the insulating sheet is smaller than the cross-sections of the voltage sheet and the current sheet.

[0010] Preferably, through holes are opened on the surface of the first fixed seat, and nuts are inserted and fixed in the inner cavities of the through holes of the first fixed seat. There are two groups of nuts.

[0011] Preferably, the extrusion structure includes an upper pressing block. A fixing groove is opened on the side wall of the upper pressing block, and the inner cavity of the fixing groove is inserted and fixed with the end of the elastic piece away from the second fixed seat. A plurality of anti-slip grooves are opened on the lower surface of the upper pressing block.

[0012] Preferably, a notch is opened at the end of the second fixed seat away from the elastic piece, and a roller is arranged in the inner cavity of the notch of the second fixed seat. The roller is rotationally connected to the inner side wall of the notch of the second fixed seat through a second shaft core.

[0013] Preferably, the upper surface of the second fixing seat is fixedly connected with anti-slip bumps, and several groups of anti-slip bumps are provided. The several groups of anti-slip bumps are distributed in a rectangular shape on the upper surface of the second fixing seat.

[0014] Compared with the prior art, the beneficial effects of the present utility model are as follows:

[0015] 1. The present utility model provides a battery test fixture. Through the cooperation of the elastic sheet, the elastic sheet has a yield effect. When the fixture clamps the battery pole piece, it can ensure the effective area of contact between the battery pole piece and the current sheet on the lower clamping body. Through the blade-shaped settings of the voltage sheet and the current sheet, the blade can pierce the oxide film on the surface of the battery pole piece to maintain the optimal conductivity; and the blade can bite the battery pole piece, making the clamping of the battery pole piece by the fixture more stable, thereby improving the clamping effect of the battery test fixture on the battery tab, increasing the contact performance between the battery tab and the conductive body of the fixture, and enhancing the stability during the test process.

[0016] 2. The present utility model provides a battery test fixture. Through the setting of the roller, when clamping the battery pole piece, first, "opening the fixture device" presses on the roller and opens the front end of the upper clamping body. Through the rolling of the roller, the wear resistance is increased, and the resistance between the upper clamping body and the "opening the fixture device" during opening is reduced.

[0017] Other features and advantages of the present utility model will be described in the subsequent specification, and part of them will be obvious from the specification or understood by implementing the present utility model. The objectives and other advantages of the present utility model can be achieved and obtained through the structures pointed out in the specification and the drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It is a schematic structural diagram of the battery fixture of the present utility model clamping a battery;

[0019] Figure 2 It is a schematic structural diagram of the whole of the present utility model;

[0020] Figure 3 It is a schematic exploded structural diagram of the present utility model;

[0021] Figure 4 It is a schematic structural diagram of the second fixing seat of the present utility model.

[0022] In the figure: 1. Lower clamping body; 11. First fixing seat; 12. Voltage sheet; 13. Current sheet; 2. Upper clamping body; 21. Second fixing seat; 22. Card slot; 23. Elastic sheet; 24. Extrusion structure; 241. Upper pressing block; 242. Fixed slot; 243. Anti-slip slot; 3. First shaft core; 4. Torsion spring; 5. Avoidance space; 6. Insulating sheet; 7. Nut; 8. Roller; 9. Second shaft core; 10. Anti-slip bump. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0023] The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0024] Please refer to Figures 1-4 , the present invention provides a technical solution: a battery test fixture, including a lower clamping body 1 and an upper clamping body 2. The lower clamping body 1 and the upper clamping body 2 are rotatably connected through a first shaft core 3. A torsion spring 4 is sleeved on the outer surface of the first shaft core 3. The torsion spring 4 is located between the lower clamping body 1 and the upper clamping body 2. The lower clamping body 1 includes a first fixed seat 11. A voltage piece 12 is arranged at the top end of the first fixed seat 11. The top end of the voltage piece 12 is arranged in a blade shape. A current piece 13 is arranged on the upper surface of the voltage piece 12. A number of blades of the same size are arranged on the upper surface of the current piece 13. Both the voltage piece 12 and the current piece 13 are fixed on the upper surface of the first fixed seat 11 by rivets. The upper clamping body 2 includes a second fixed seat 21. A clamping groove 22 is opened at the end of the second fixed seat 21. An elastic piece 23 is inserted and fixed in the inner cavity of the clamping groove 22. The other end of the elastic piece 23 is provided with a pressing structure 24 for pressing the battery pole piece.

[0025] Open the fixture, place the battery pole piece on the lower clamping body 1, and then release the fixture. The upper clamping body 2 is reset through the torsion spring 4, so that the upper clamping body 2 drives the pressing structure 24 to contact the battery pole piece through the elastic piece 23. The elastic piece 23 has a yielding effect. When the fixture clamps the battery pole piece, it can ensure the effective area of contact between the battery pole piece and the current piece 13 on the lower clamping body 1. Through the blade-shaped settings of the voltage piece 12 and the current piece 13, the blades can pierce the oxide film on the surface of the battery pole piece to maintain the optimal conductivity; and the blades can bite the battery pole piece, making the clamping of the battery pole piece by the fixture more stable, thereby improving the clamping effect of the battery test fixture on the battery tab, increasing the contact performance between the battery tab and the conductive body of the fixture, and enhancing the stability during the test process.

[0026] A clearance position 5 is opened on the upper surface of the first fixed seat 11. The clearance position 5 is arranged directly below the voltage piece 12. Through the setting of the clearance position 5, when the fixture clamps the battery pole piece, the voltage piece 12 will be pressed down and then rebound into the clearance position 5, so that the blade height of the voltage piece 12 is equal to the blade height on the current piece 13.

[0027] An insulating sheet 6 is provided at the top of the first fixing base 11. The insulating sheet 6 is located between the voltage sheet 12 and the current sheet 13. The cross-section of the insulating sheet 6 is smaller than that of the voltage sheet 12 and the current sheet 13. Through the setting of the insulating sheet 6, the voltage sheet 12 and the current sheet 13 are separated to avoid interference caused by mutual connection.

[0028] Through holes are formed on the surface of the first fixing base 11. Two groups of nuts 7 are inserted and fixed in the inner cavity of the through holes of the first fixing base 11. Through the setting of the nuts 7, it is convenient to connect the test equipment with the battery test fixture.

[0029] The extrusion structure 24 includes an upper pressing block 241. A fixing groove 242 is formed on the side wall of the upper pressing block 241. The inner cavity of the fixing groove 242 is inserted and fixed with the end of the elastic sheet 23 away from the second fixing base 21. A plurality of groups of anti-slip grooves 243 are formed on the lower surface of the upper pressing block 241. The second fixing base 21 drives the upper pressing block 241 to move downward through the elastic sheet 23, so that the upper pressing block 241 contacts the surface of the battery electrode plate for extrusion. Through the setting of the anti-slip grooves 243, the friction between the upper pressing block 241 and the battery electrode plate is increased, and the battery electrode plate is prevented from sliding after being fixed. The surface of the upper pressing block contacting the battery electrode plate can be a smooth surface or a surface with anti-slip effect.

[0030] A notch is formed at one end of the second fixing base 21 away from the elastic sheet 23. A roller 8 is arranged in the inner cavity of the notch of the second fixing base 21. The roller 8 is rotatably connected to the inner side wall of the notch of the second fixing base 21 through a second shaft core 9. Through the setting of the roller 8, the wear resistance is increased, and the resistance between the upper clamping body 2 and the "open fixture device" during opening is reduced.

[0031] Anti-slip convex blocks 10 are fixedly connected to the upper surface of the second fixing base 21. A plurality of groups of anti-slip convex blocks 10 are distributed in a rectangular shape on the upper surface of the second fixing base 21. Through the setting of the anti-slip convex blocks 10, the friction between the staff's hand and the surface of the second fixing base 21 is increased, and the phenomenon of slipping during the "open fixture device" is avoided.

[0032] During specific use: First, press the "open fixture device" onto the roller 8 and open the front end of the upper clamping body 2 to reduce the resistance between the upper clamping body 2 and the "open fixture device" when opening. After opening, take the battery and place the battery electrode on the lower clamping body 1. Then release the upper clamping body 2, and the torsion spring 4 rebounds to drive the upper clamping body 2 to reset, so that the second fixed seat 21 pushes the upper pressing block 241 to contact the battery electrode through the elastic piece 23. The elastic piece 23 has a yielding effect. When the fixture clamps the battery electrode, it can ensure the effective area of contact between the battery electrode and the current sheet 13 on the lower clamping body 1. Through the blade-shaped setting of the voltage sheet 12 and the current sheet 13, when the lower clamping body 1 contacts the battery electrode, the blade can pierce the oxide film on the surface of the battery electrode to maintain the optimal conductivity; and the blade can bite the battery electrode to make the clamping of the battery electrode by the fixture more stable, thereby improving the clamping effect of the battery test fixture on the battery tab, increasing the contact performance between the battery tab and the conductive body of the fixture, and enhancing the stability during the test process;

[0033] The use of the voltage sheet 12 and the current sheet 13 in this fixture solution is for large-current soft-pack batteries. If it is a small-current soft-pack battery, the voltage sheet 12 plus the current sheet 13 plus the insulating sheet 6 in this fixture solution can be replaced by a PCB board provided with a voltage area and a current area. This fixture is only used to clamp one electrode of the battery; when two or more electrodes need to be clamped side by side, it is necessary to set up two or more such fixtures arranged side by side to form an integrated fixture;

[0034] In this embodiment, the contact position between the current sheet 13 on the lower clamping body 1 and the battery can also be replaced by arranging a number of pyramid-shaped pointed teeth of the same size instead of arranging a number of blades of the same size, which can also pierce the oxide film on the surface of the battery electrode to maintain the optimal conductivity; and the pyramid-shaped pointed teeth can bite the battery electrode to make the clamping of the battery electrode by the fixture more stable.

[0035] Although the embodiments of the present invention have been shown and described, for those of ordinary skill in the art, it can be understood that various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A battery testing fixture, comprising a lower clamping body (1) and an upper clamping body (2), characterized in that: The lower clamping body (1) and the upper clamping body (2) are rotatably connected via a first shaft core (3); a torsion spring (4) is sleeved on the outer surface of the first shaft core (3); the torsion spring (4) is located between the lower clamping body (1) and the upper clamping body (2); the lower clamping body (1) comprises a first fixing seat (11); a voltage sheet (12) is arranged at the top end of the first fixing seat (11); the top end of the voltage sheet (12) is arranged in a blade shape; a current sheet (12) is arranged on the upper surface of the voltage sheet (12); 3), the upper surface of the current sheet (13) is arranged with a plurality of blades of the same size, the voltage sheet (12) and the current sheet (13) are fixed to the upper surface of the first fixing seat (11) by rivets, the upper clamping body (2) comprises a second fixing seat (21), the end of the second fixing seat (21) is provided with a slot (22), the inner cavity of the slot (22) is plugged with a spring sheet (23), and the other end of the spring sheet (23) is provided with an extrusion structure (24) for pressing the battery electrode sheet.

2. A battery testing fixture according to claim 1, characterized in that: The upper surface of the first fixing seat (11) is provided with an escape position (5), and the escape position (5) is arranged directly below the voltage plate (12).

3. A battery testing fixture according to claim 1, characterized in that: An insulating sheet (6) is provided at the top end of the first fixing seat (11); the insulating sheet (6) is located between the voltage sheet (12) and the current sheet (13); and the cross-section of the insulating sheet (6) is smaller than the cross-sections of the voltage sheet (12) and the current sheet (13).

4. A battery testing fixture according to claim 1, characterized in that: A through hole is provided on the surface of the first fixing seat (11), a nut (7) is inserted and fixed in the inner cavity of the through hole of the first fixing seat (11), and two groups of nuts (7) are provided.

5. A battery testing fixture according to claim 1, characterized in that: The extrusion structure (24) comprises an upper pressing block (241), a side wall of the upper pressing block (241) is provided with a fixing groove (242), an inner cavity of the fixing groove (242) is plugged and fixed to an end of the spring sheet (23) away from the second fixing seat (21), and a lower surface of the upper pressing block (241) is provided with a plurality of groups of anti-slip grooves (243).

6. A battery testing fixture according to claim 1, characterized in that: A notch is provided at one end of the second fixing seat (21) away from the spring sheet (23); a roller (8) is provided in the inner cavity of the notch of the second fixing seat (21); and the roller (8) is rotatably connected to the inner side wall of the notch of the second fixing seat (21) via a second shaft core (9).

7. A battery testing fixture according to claim 1, characterized in that: The upper surface of the second fixed seat (21) is fixedly connected with anti-skid protrusions (10), and the anti-skid protrusions (10) are provided in a plurality of groups, and the plurality of groups of anti-skid protrusions (10) are distributed in a rectangular shape on the upper surface of the second fixed seat (21).

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