Clamp for assembling lithium battery

Abstract

The utility model relates to the technical field of clamps, in particular to a lithium battery assembly clamp which comprises a clamping unit and a connecting piece, the clamping unit is composed of four sets of clamping pieces which slide mutually, a clamping cavity is formed among the four sets of clamping pieces and used for clamping multiple sets of battery cells, each set of clamping piece comprises two clamping plates, and the clamping plates are arranged on the clamping unit. The two clamping plates are arranged on the clamping pieces, the two clamping plates are arranged on the clamping pieces, when the two clamping plates are separated, a binding channel is formed between the two clamping plates, and the connecting pieces are movably connected to the clamping pieces and used for connecting the two clamping plates on each group of clamping pieces, so that the two clamping plates can move in the length extension direction of the connecting pieces. And the periphery of the battery cell is bound without dismounting the clamp, so that the stability of the battery cell after being taken out of the clamping cavity is improved, the risks of deviation and bending of a spot welding part are reduced, and the battery cell is ensured to be effectively fixed.

Description

Technical Field

[0001] This application relates to the technical field of fixtures, and particularly to a fixture for lithium battery assembly. Background Art

[0002] The application of lithium batteries is presented in a multi-series and multi-parallel manner, that is, a lithium battery is composed of multiple electrochemical cells containing positive and negative electrodes. For example, the lithium battery of an electric bicycle is composed of multiple groups of cylindrical batteries. These batteries are combined into a battery pack through a specific connection method, and at the same time, a protection circuit and a battery management system are integrated to ensure the safety and service life of the battery. In some square or rectangular battery packs, the battery cores may be neatly arranged on a plane. Such an arrangement is convenient for management and maintenance, and is also beneficial to heat dissipation.

[0003] When assembling these battery cores, fixtures are also used to limit the battery cores to avoid them from tipping over, so as to have better stability during subsequent nickel strip spot welding. After spot welding is completed, it is usually necessary to use fiber tape to wind and fix multiple battery cores to improve stability. However, for the current fixtures, after spot welding is completed, the battery core group needs to be taken out of the fixture and then bundled and fixed with fiber tape. During the taking-out process, the battery core group or a certain group of battery cores may shift, causing the spot welding part to bend. Once the bending phenomenon occurs, it may change the connection strength and contact resistance between the battery cores, affecting the current transmission efficiency and stability, and reducing the quality of lithium battery assembly. Summary of the Utility Model

[0004] This application provides a fixture for lithium battery assembly to avoid bending of the spot welding part when the battery core group is taken out.

[0005] The above technical purpose of this application is achieved through the following technical solutions:

[0006] A fixture for lithium battery assembly includes a clamping unit and a connecting member. The clamping unit is composed of four mutually sliding clamping members. A clamping cavity is formed between the four clamping members for clamping multiple groups of battery cores. Each clamping member includes two clamping plates. When the two clamping plates are separated, a bundling channel is formed between the two clamping plates. The connecting member is movably connected to the clamping member and is used to connect the two clamping plates on each clamping member, so that the two clamping plates can move along the length extension direction of the connecting member.

[0007] By adopting the above technical solution, after clamping and fixing multiple groups of battery cores through the clamping unit, the upper clamping plate can be slid upward to expose the bundling channel, so as to facilitate winding and fixing around the battery cores through the bundling channel without removing the clamping unit.

[0008] Optionally, an elastic ring is provided on the connecting member. A connecting cavity for the sliding of the connecting member is formed in the clamping member. The inner diameter of the connecting cavity is smaller than the inner diameter of the elastic ring. An annular receiving groove is formed inside the connecting cavity, and the inner diameter of the annular receiving groove is larger than the outer diameter of the connecting cavity.

[0009] By adopting the above technical solution, after the elastic ring moves into the annular receiving groove, the clamping plate located above can be supported.

[0010] Optionally, a rotating portion is provided at the upper end of the connecting member, and the rotating portion is in threaded connection with the upper end of the clamping plate located above.

[0011] By adopting the above technical solution, through the threaded connection between the rotating portion and the clamping plate, it is convenient to disconnect the connecting member from the clamping plate so as to draw out the connecting member from the lower clamping plate.

[0012] Optionally, a receiving groove is formed at the lower end of the clamping plate located above, and the inner diameter of the receiving groove is larger than the outer diameter of the elastic ring.

[0013] By adopting the above technical solution, when the connecting member is pulled upward, the elastic ring can be located in the receiving groove, so that the lower end of the connecting rod will not leak out in the bundling channel, preventing the winding of the fiber tape from being affected.

[0014] Optionally, a locking screw is connected to one end of the clamping plate. A locking disc is in threaded connection with the locking screw, and a through groove for the locking screw to pass through is formed in the clamping plate.

[0015] By adopting the above technical solution, through the abutment between the locking disc and the clamping plate, two adjacent clamping plates can be connected, thereby fixing the area size of the clamping cavity.

[0016] Optionally, a connecting handle is provided on the side wall of the clamping plate.

[0017] By adopting the above technical solution, it is convenient to pull the upper and lower clamping plates to separate them.

[0018] Optionally, scale marks are provided on the upper end face of the clamping member.

[0019] By adopting the above technical solution, the position of the clamping plate can be adjusted with reference to the scale marks, which is clearer and more straightforward.

[0020] Optionally, a sliding cavity coaxial with the connecting cavity is formed inside the lower clamping plate, and the inner diameter of the sliding cavity is larger than the outer diameter of the elastic ring.

[0021] By adopting the above technical solution, it is possible to avoid the generation of resistance when the elastic ring slides in the connecting cavity, which affects the upward sliding of the upper clamping plate.

[0022] By separating two clamping plates vertically, a bundling channel is formed, enabling bundling around the outer periphery of the battery cell without disassembling the fixture, increasing the stability of the battery cell after being taken out of the clamping cavity, reducing the risks of offset and bending at the spot welding position, and ensuring effective fixation of the battery cell. Description of the Drawings

[0023] Figure 1 is an isometric structural schematic diagram provided by the present application;

[0024] Figure 2 is a structural schematic diagram when the bundling channel provided by the present application is around the outer periphery of the battery cell;

[0025] Figure 3 is a structural schematic diagram when the two clamping plates provided by the present application are separated;

[0026] Figure 4 is a structural schematic diagram when the elastic ring provided by the present application is located in the annular receiving groove;

[0027] Figure 5 is a structural schematic diagram when the elastic ring provided by the present application is located in the receiving groove.

[0028] Description of the Reference Numerals: 1. Clamping member; 11. Connecting handle; 2. Clamping cavity; 21. Clamping plate; 22. Bundling channel; 3. Connecting member; 31. Elastic ring; 32. Connecting cavity; 33. Annular receiving groove; 34. Rotating part; 4. Receiving groove; 5. Locking screw; 51. Locking disc; 52. Through groove; 6. Scale marking; 7. Sliding cavity. Detailed Description of the Embodiment

[0029] The following further elaborates on the present application with reference to the drawings.

[0030] An embodiment of the present application discloses a fixture for lithium battery assembly, as Figures 1-5As shown, it includes a clamping unit. The clamping unit is composed of four groups of sliding clamping members 1. A clamping cavity 2 is formed between the four groups of clamping members 1 for clamping multiple groups of battery cores. The position of the corresponding clamping member 1 can be adjusted according to the size and shape of the battery pack and the number of battery cores, so as to adjust the size of the clamping cavity 2. During use, cylindrical or plate-shaped battery cores are arranged in the clamping cavity 2 in sequence, so that the clamping cavity 2 can limit multiple battery cores for subsequent processing operations. Specifically, each group of clamping members 1 includes two clamping plates 21, and the sum of the heights of the two clamping plates 21 can be close to the height of the battery core, avoiding unstable clamping effects caused by the height of the clamping plate 21 being lower than the height of the battery core, such as the battery core tipping in the clamping cavity 2. When the two clamping plates 21 are separated up and down, a bundling channel 22 is formed between the two clamping plates 21. After nickel-plate spot welding is completed on the battery cores in the clamping unit, the outer wall of the battery core located outside can be exposed through the bundling channel 22, so that the outer circumference of the battery core group can be wound with a fiber tape or the like to bundle and fix the battery core group. Then, the clamping unit is removed to avoid the risk of bending at the spot welding part and make the fixing effect of the battery core better.

[0031] Among them, as Figure 4 shown, in order to prevent the two clamping plates 21 of each group of clamping members 1 from falling off, a connecting member 3 is movably connected to the clamping member 1. The connecting member 3 is used to connect the two clamping plates 21 of each group of clamping members 1, so that the two clamping plates 21 can move along the length extension direction of the connecting member 3. When the bundling channel 22 is adjusted out, the two clamping plates 21 will not be separated and fall off, so as not to affect the clamping effect on the battery core. And an elastic ring 31 is provided on the connecting member 3, and a connecting cavity 32 for the connecting member 3 to slide is opened in the clamping member 1. The inner diameter of the connecting cavity 32 is smaller than the inner diameter of the elastic ring 31, and an annular receiving groove 33 is opened inside the connecting cavity 32. The inner diameter of the annular receiving groove 33 is larger than the outer diameter of the connecting cavity 32. When the two clamping plates 21 are separated, the upper clamping plate 21 drives the connecting member 3 to move upward. When the elastic ring 31 follows the synchronous movement of the connecting member 3 into the annular receiving groove 33, at this time, the elastic ring 31 can be not squeezed by the connecting cavity 32, and the elastic ring 31 can be stuck in the annular receiving groove 33 after restoring deformation. The elastic ring 31 can be made of elastic materials such as rubber and silica gel, so as to support the upper clamping plate 21 through the connecting member 3, and a certain space is formed between the upper and lower clamping plates 21 to form a bundling channel 22.

[0032] Furthermore, as Figure 4As shown in the figure, in order to prevent the connector 3 in the bundling channel 22 from affecting the bundling of the fiber tape or the like around the outer periphery of the battery cell, a rotating part 34 is provided at the upper end of the connector 3, and the rotating part 34 is threadedly connected to the upper end of the upper clamping plate 21 located above. By screwing the rotating part 34, the rotating part 34 can be separated from the clamping plate 21. At this time, by pulling the connector 3 upward, the connector 3 can be withdrawn from the annular receiving groove 33, so that the connector 3 will not penetrate through the bundling channel 22. When the rotating part 34 is threadedly connected to the upper clamping plate 21 above, when separating the two clamping plates 21, only by applying an upward pulling force to the upper clamping plate 21, it is convenient to drive the connector 3 and the elastic ring 31 to move upward through the upper clamping plate 21.

[0033] Further, as Figure 5 shown, a receiving groove 4 is formed at the lower end of the upper clamping plate 21, and the inner diameter of the receiving groove 4 is larger than the outer diameter of the elastic ring 31. When pulling the connector 3 upward, the elastic ring 31 can enter the receiving groove 4, so that the bottom end of the connector 3 will not protrude into the bundling channel 22, so as not to affect the passage of the tape. When bundling the battery cell with the tape, when the tape is bundled near the connector 3, the connector 3 can be pulled upward to allow the tape to pass through and then the connector 3 can be moved downward so that the elastic ring 31 is snapped into the annular receiving groove 33 again, and the upper clamping plate 21 is supported by threadedly connecting the rotating part 34 to the upper clamping plate 21 above. Two sets of connectors 3 can be provided on each clamping member 1 to prevent the upper clamping plate 21 from falling when the rotating part 34 is separated from the clamping plate 21.

[0034] Further, as Figure 1 shown, a connecting handle 11 is provided on the side wall of the clamping plate 21. During use, the user can pull the upper and lower connecting handles 11 with the assistance of others or other tools to separate the upper and lower clamping plates 21, which is more convenient.

[0035] Further, as Figure 5 shown, when the elastic ring 31 moves to the lower part of the annular receiving groove 33, if the elastic ring 31 still always abuts against the connecting cavity 32, it is not easy to separate the upper and lower clamping plates 21. Therefore, a sliding cavity 7 coaxial with the connecting cavity 32 is formed inside the lower clamping plate 21, and the inner diameter of the sliding cavity 7 is larger than the outer diameter of the elastic ring 31. When the connector 3 drives the elastic ring 31 to move downward from the annular receiving groove 33, once it enters the sliding cavity 7, there will be no abutting friction between the inside of the sliding cavity 7 and the elastic ring 31, so that the movement between the upper and lower clamping plates 21 is smoother.

[0036] Among them, as Figure 1 and Figure 3As shown in the figure, one end of the clamping plate 21 is connected with a locking screw 5. A locking disc 51 is threadedly connected to the locking screw 5. A through groove 52 for the locking screw 5 to pass through is provided on the clamping plate 21. When it is necessary to adjust the area of the clamping cavity 2 to adapt to the assembly of battery panels of different sizes, the corresponding clamping plate 21 can be moved. Then, by rotating the locking disc to abut against the outer wall of the clamping plate 21, the position of the clamping plate 21 can be locked. A scale marking 6 is provided on the upper end face of the clamping member 1. When moving the position of the clamping plate 21, the length or width of the battery pack can be measured in advance, or the diameter of each battery cell can be measured. Then, the diameters of the horizontally or vertically placed battery cells are added together. According to the scale line value, the distance between the opposite clamping plates 21 can be adjusted. Or the battery cells can be directly placed. Then, by sliding the other clamping plate 21 to contact the outermost battery cell, the limiting of the battery cells can also be achieved.

[0037] This specific embodiment is only an interpretation of the present application and does not limit the present application. After reading this specification, those skilled in the art can make modifications to this embodiment without creative contributions as needed, but as long as it is within the scope of the claims of the present application, it is protected by the patent law.

Claims

1. A fixture for assembling lithium batteries, characterized in that: include; A clamping unit, the clamping unit comprising four groups of clamping members (1) sliding against each other, a clamping cavity (2) formed between the four groups of clamping members (1) for clamping a plurality of groups of battery cells, and each group of the clamping members (1) comprising two clamping plates (21), when the two clamping plates (21) are separated, a binding channel (22) is formed between the two clamping plates (21); A connecting member (3) is movably connected to the clamping member (1) and is used to connect two clamping plates (21) on each group of the clamping members (1) so that the two clamping plates (21) can move along the length extension direction of the connecting member (3).

2. A lithium battery assembly fixture according to claim 1, characterized in that: The connecting member (3) is provided with an elastic ring (31), and a connecting cavity (32) for the connecting member (3) to slide is provided in the clamping member (1), the inner diameter of the connecting cavity (32) is smaller than the inner diameter of the elastic ring (31), and an annular receiving groove (33) is provided inside the connecting cavity (32), and the inner diameter of the annular receiving groove (33) is larger than the outer diameter of the connecting cavity (32).

3. A lithium battery assembly fixture according to claim 1, characterized in that: The upper end of the connecting member (3) is provided with a rotating portion (34), and the rotating portion (34) is threadedly connected to the upper end of the clamping plate (21) located above.

4. A lithium battery assembly fixture according to claim 2, characterized in that: A receiving groove (4) is provided at the lower end of the clamping plate (21) located at the top, and the inner diameter of the receiving groove (4) is greater than the outer diameter of the elastic ring (31).

5. A lithium battery assembly fixture according to claim 1, characterized in that: One end of the clamping plate (21) is connected to a locking screw (5), a locking plate (51) is threadedly connected to the locking screw (5), and a through slot (52) for the locking screw (5) to pass through is formed on the clamping plate (21).

6. A lithium battery assembly fixture according to claim 1, characterized in that: A connecting handle (11) is provided on the side wall of the clamping plate (21).

7. A lithium battery assembly fixture according to claim 1, characterized in that: The upper end surface of the clamping member (1) is provided with a scale mark (6).

8. A lithium battery assembly fixture according to claim 2, characterized in that: A sliding cavity (7) coaxially arranged with the connecting cavity (32) is provided inside the lower clamping plate (21), and the inner diameter of the sliding cavity (7) is greater than the outer diameter of the elastic ring (31).

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