Battery cell in-box structure with pre-tightening force

Abstract

The utility model discloses a battery cell in-box structure with pretightening force, which comprises a box body, a working table and battery cells, a plurality of battery cells are arranged on the working table through a limiting assembly after being arranged in sequence, a cushion pad is arranged between every two adjacent battery cells, battery cell tabs on the working table are arranged in the box body after being welded, the limiting assembly comprises a limiting block, and the limiting block is arranged on the working table. The limiting blocks are in sliding connection with kidney-shaped holes formed in the workbench, and a space formed by oppositely arranging the at least two limiting blocks is used for limiting a battery cell; according to the battery cell boxing structure, the problems of boxing after short knife type battery cells are welded, keeping tabs not stressed and ensuring accurate pre-tightening pressure are solved, the buffer pads are arranged between the adjacent battery cells, the pre-tightening pressure is formed through pressing deformation of the buffer pads, certain pre-tightening pressure is ensured when the battery cells enter a battery pack, the early-stage circulation is good, the later-stage expansion force is controllable, and the battery cell boxing structure is suitable for large-scale popularization and application. The service life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of battery preparation, in particular to a battery core box-entering structure with pre-tightening force. Background Art

[0002] As competition in the electric vehicle industry becomes increasingly fierce, the energy density, volume grouping rate, mass grouping rate and cost of battery packs have become the main development directions of battery packs. The previous 355, 390, and 590 modules have transitioned to CTP, CTB and CTC, which are now being deployed by various vehicle manufacturers and battery manufacturers. The volume grouping rate of battery packs is getting higher and higher, and at the same time, due to the reduction of structural parts, the cost has also decreased.

[0003] By observing the expansion force and cycle life performance when the battery cells are grouped, whether it is a wound or laminated lithium-ion battery, its optimal cycle life is under a certain preload pressure. In the current CTP structure, the battery cells are rectangular shell batteries with a length of more than 900mm and tabs at both ends. This solution can be welded after the battery cells are placed inside the box; for square shell batteries, the poles are facing upward, and the battery cells can be put into the box first and the tabs can be welded later. Under these types of battery conditions, the battery tabs are less stressed. However, for batteries with a length of ≤600mm and tabs at both ends, the tabs cannot be welded after entering the box, and the welding needs to be completed before the module is entered. In this case, the entire battery module needs to be clamped for welding, and then it is put into the box under clamping conditions. There is currently a lack of a box entry structure under clamping conditions. Utility Model Content

[0004] Based on the technical problems existing in the background technology, the utility model proposes a battery cell entry structure with pre-tightening force, which ensures a certain pre-tightening pressure when the battery cell is put into the battery pack, has good early circulation, controllable later expansion force, and extends the service life.

[0005] The utility model proposes a battery cell boxing structure with pre-tightening force, comprising a box body, a workbench and battery cells. A plurality of battery cells are arranged in sequence and arranged on the workbench through a limiting component, and a buffer pad is arranged between adjacent battery cells. After the battery cell pole ears on the workbench are welded, they are arranged in the box body.

[0006] Furthermore, the limiting assembly includes a limiting block, which is slidably connected to a waist-shaped hole provided on the workbench, and a space formed by at least two limiting blocks arranged relatively to each other is used for limiting the battery cell.

[0007] Furthermore, the box-entering structure also includes a loading plate, the workbench is arranged on the loading plate, and the loading plate covers the opening end of the box body.

[0008] Furthermore, after the battery cell passes through the workbench limit, the tabs of the battery cell are welded, and then the workbench is positioned on the loading plate.

[0009] Furthermore, the box is inverted on the loading plate after the battery cells are arranged, and the battery cells are bonded to the inner wall of the box.

[0010] Furthermore, the length of the battery cell is less than or equal to 600 mm, and the battery cell is a square battery cell with tabs at both ends.

[0011] The advantage of a battery cell entry structure with pre-tightening force provided by the utility model is that the battery cell entry structure with pre-tightening force provided in the utility model solves the problem of short-knife type battery cells being put into the box after welding, keeping the pole ears free from stress and ensuring accurate pre-tightening pressure, by arranging buffer pads between adjacent battery cells, forming pre-tightening pressure through compression and deformation of the buffer pads, thereby ensuring a certain pre-tightening pressure when the battery cells are put into the battery pack, achieving good early circulation, controllable expansion force in the later stage, and extending service life. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] Figure 1 It is a structural schematic diagram of the utility model;

[0013] Figure 2 It is a schematic diagram of the structure of setting the battery cell on the workbench;

[0014] Figure 3 It is a schematic diagram of the structure of loading the battery cell into the box;

[0015] Among them, 1-box, 2-workbench, 3-battery cell, 4-limiting assembly, 5-loading plate, 41-limiting block, 42-limiting plate. DETAILED DESCRIPTION

[0016] Below, the technical solution of the utility model is described in detail through specific embodiments. Many specific details are described in the following description to facilitate a full understanding of the utility model. However, the utility model can be implemented in many other ways different from those described here, and those skilled in the art can make similar improvements without violating the connotation of the utility model. Therefore, the utility model is not limited by the specific implementation disclosed below.

[0017] like Figures 1 to 3 As shown, the utility model proposes a battery cell box structure with pre-tightening force, including a box body 1, in which a workbench 2 and battery cells 3 are arranged. A plurality of battery cells 3 are arranged in sequence and are set on the workbench 2 through a limiting component 4, and buffer pads are set between adjacent battery cells 3.

[0018] For square battery cells with a length of ≤600mm and tabs at both ends, before placing the battery cell 3 in the box body 1, the entire battery cell needs to be welded in a clamped state and then put into the box under the clamped condition. This can solve the problem of putting the short-blade type battery cell into the box after welding, keeping the tabs free of force and ensuring accurate pre-tightening pressure. By arranging buffer pads between adjacent battery cells 3 and forming pre-tightening pressure through the compression deformation of the buffer pads, a certain pre-tightening pressure can be guaranteed when the battery cell is in the battery pack, so that the early cycle is good, the later expansion force is controllable, and the service life is extended.

[0019] Among them, the limiting assembly 4 includes a limiting block 41 and a limiting plate 42. The limiting block 41 is slidably connected to the waist-shaped hole opened on the workbench 2, so that the position of the limiting block 41 can be adjusted to achieve the compressed state of the buffer pad. The space formed by the relative arrangement of at least two limiting blocks 41 is used to limit the battery cell 3. At this time, in order to ensure the uniformity of the preload force on the battery cell 3, a limiting plate 42 is arranged between the limiting block 41 and the battery cell 3. The limiting plate 42 and the limiting block 41 are fixedly arranged, and a buffer pad is arranged on the surface of the limiting plate 42 close to the battery cell 3, so that the force on both sides of the battery cell 3 is uniform. In order to quantify the position adjustment of the limiting block 41, a pressure sensor can be arranged at the position where the limiting block 41 is attached to the battery cell, so as to obtain the actual pressure of the limiting block 41 on the battery cell in real time. When the actual pressure reaches the set pressure value, the limiting block 41 is stopped from being adjusted, and is fixed by bolts passing through the waist-shaped holes of the limiting block 41 and the workbench 2.

[0020] It is not ruled out that the waist-shaped hole can be replaced by setting a row of several through holes. At this time, the holes opened on the limit block are matched with these through holes to find a relatively good position, and then the limit block and the through hole are fixed by screws passing through them. The through hole can adopt a threaded structure.

[0021] In this embodiment, the box-entering structure further includes a loading plate 5 , the workbench 2 is disposed on the loading plate 5 , and the loading plate 5 covers the open end of the box body 1 .

[0022] In addition, multiple workbenches 2 can be set on the loading plate 5, and multiple positioning holes are set on the loading plate 5. The guide holes opened on the workbenches 2 cooperate with the positioning holes to realize the positioning of the multiple workbenches 2 on the loading plate 5. This positioning effect makes it easy for the box body 1 to wrap the multiple workbenches 2 and then set them on the loading plate 5 by inverting them, thereby avoiding the problem that the box body 1 cannot be completely wrapped during the inversion process. After the inversion is completed, the box body 1 and the battery cell 3 are bonded, and the bonding force needs to be slightly greater than the pre-tightening force exerted on the battery cell through the limit block 41 and the buffer pad, so that by lifting the box body 1 again, the battery cell 3 can be lifted together with the box body 1, thereby realizing the effective entry of the battery cell 3 into the box.

[0023] Working process: the battery cell 3 is placed upside down on the workbench 2. After the battery cell 3 is placed on the workbench 2 by the limit block 41, the ear welding operation is performed. After the welding is completed, the workbench 2 is placed on the loading plate 5 and positioned with the positioning holes set on the loading plate 5; then the box body 1 is inverted on the box body 1 from the Z direction, so that the battery cell 3 is bonded to the inner wall of the box body 1. After the bonding is completed, the box body 1 is moved away along the Z direction. At this time, the battery cell 3 will be separated from the limit of the workbench 2 due to the bonding effect with the box body 1, and the box body 1 is turned over so that the box body 1 faces upward, completing the box entry work with pre-tightening pressure.

[0024] The above description is only a preferred specific implementation manner of the present invention, but the protection scope of the present invention is not limited thereto. Any technician familiar with the technical field can make equivalent replacements or changes within the technical scope disclosed by the present invention according to the technical scheme and the utility model concept of the present invention, which should be covered by the protection scope of the present invention.

Claims

1. A battery cell box-entry structure with pre-tightening force, characterized in that: The invention comprises a box body (1), a workbench (2) and a battery cell (3); a plurality of battery cells (3) are arranged in sequence and are arranged on the workbench (2) via a limiting component (4); a buffer pad is arranged between adjacent battery cells (3); and the battery cell tabs on the workbench (2) are arranged in the box body (1) after welding.

2. The battery cell box-entry structure with pre-tightening force according to claim 1 is characterized in that: The limiting assembly (4) comprises a limiting block (41), the limiting block (41) being slidably connected to a waist-shaped hole provided on the workbench (2), and a space formed by at least two limiting blocks (41) being arranged opposite to each other is used for limiting the battery cell (3).

3. The battery cell box-entry structure with pre-tightening force according to claim 1, characterized in that: The box-entering structure also includes a loading plate (5), the workbench (2) is arranged on the loading plate (5), and the loading plate (5) covers the open end of the box body (1).

4. The battery cell box-entry structure with pre-tightening force according to claim 3 is characterized in that: After the battery cell (3) passes through the position limit of the workbench (2), the tabs of the battery cell (3) are welded, and then the workbench (2) is positioned on the loading plate (5).

5. The battery cell box-entry structure with pre-tightening force according to claim 4 is characterized in that: The box body (1) is inverted onto a loading plate (5) after the battery core (3) is arranged, and the battery core (3) is bonded to the inner wall of the box body (1).

6. The battery cell box-entry structure with pre-tightening force according to claim 1, characterized in that: The length of the battery core (3) is less than or equal to 600 mm, and the battery core (3) is a square battery core with tabs at both ends.

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