Square aluminum shell cover plate with buffering expansion force

Abstract

The utility model discloses a square aluminum shell cover plate with buffering expansion force, and relates to the technical field of lithium ion batteries. The battery aluminum shell cover plate comprises a cover plate body, a plurality of sliding grooves are evenly formed in the bottom end of the cover plate body, elastic buffering assemblies matched with the sliding grooves are installed at the bottom end of the cover plate body, and the elastic buffering assemblies are used for being matched with the adjacent sliding grooves to avoid deformation of a battery aluminum shell. According to the utility model, the plurality of sliding grooves are uniformly formed along the edge of the bottom of the cover plate body, and the elastic buffer components are adaptively mounted on the outer sides of the sliding grooves, so that the cover plate can absorb multidirectional deformation pressure generated by expansion of internal battery cells and maintain the shape of an external aluminum shell, and therefore, when batteries are assembled into a battery pack, the connection of a welding master tape between top end poles is more stable.

Description

Technical Field

[0001] This utility model belongs to the field of lithium-ion battery technology, and specifically relates to a square aluminum shell cover plate with buffer expansion force. Background Technology

[0002] Square aluminum-cased batteries typically use aluminum as the battery casing, with a casing thickness between 0.2 and 0.3 mm. During charging and discharging, the internal cells can deform due to the generation of gas and other factors. Since the aluminum casing is relatively soft, the aluminum casing expands when the cells deform and compress it. These types of aluminum-cased lithium-ion batteries are often used in battery packs, where the top terminals of each battery are integrally welded to busbars for series and parallel connections. When the aluminum casing of a single cell expands, the weld points of the integrally welded busbars may shift, affecting the normal operation of the battery pack. Therefore, anti-expansion treatment is required for the aluminum casing.

[0003] The existing technical solution is to enclose and tighten the outer frame of the battery module to reinforce it, and use the tightening ability of the external tightening structure to avoid the expansion of the battery aluminum shell.

[0004] The shortcoming of this technical solution is that when the lithium battery is used as a battery pack and the outer frame is centrally tightened and reinforced, the aluminum shell located at the center of the battery pack and the inner side of the reinforced outer frame is not reinforced in the same way as the outer frame. As a result, the tightening structure on the outside of the battery pack will force the battery cells to transfer the deformation pressure of the outer expansion to the inner side of the battery pack that is tightened. Since the center of the battery pack is in a low-tightening state, the integrated tightening of the battery pack will still cause the weld points of the busbars that are integrally welded between the top terminals to shift. In other words, the anti-deformation structure of the aluminum shell formed by external force reinforcement cannot effectively prevent the expansion and deformation of the individual aluminum battery shell.

[0005] No effective solutions have yet been proposed to address the problems in the relevant technologies. Utility Model Content

[0006] The purpose of this utility model is to provide a square aluminum shell cover plate with buffer expansion force. The technical problem to be solved is as follows: Existing lithium-ion batteries are prone to aluminum shell expansion during use.

[0007] The objective of this utility model can be achieved through the following technical solutions:

[0008] A square aluminum shell cover with buffering expansion force includes a cover body. The bottom end of the cover body is evenly provided with a plurality of sliding grooves. An elastic buffer component is installed at the bottom end of the cover body to fit the sliding grooves. The elastic buffer component is used to cooperate with the adjacent sliding grooves to prevent the aluminum shell of the battery from deforming.

[0009] As a further embodiment of this utility model: the elastic buffer assembly includes a contact plate fixedly connected to one side of the bottom end of the cover plate body, and a plurality of buffer springs are evenly installed on the vertical plane of the side of the contact plate near the sliding groove, and a buffer plate is fixedly connected between the sides of each buffer spring away from the contact plate.

[0010] As a further embodiment of this utility model: a sliding block is fixedly connected to the side of the buffer plate near the sliding groove, the sliding block is slidably connected to the sliding groove, and both sides of the sliding block are in contact with the sidewall of the adjacent side of the sliding groove.

[0011] As a further embodiment of this utility model: multiple light-stealing grooves are evenly provided on the outer side of the contact plate along the vertical surface.

[0012] As a further aspect of this utility model: the bottom height of the buffer plate is less than the bottom height of the contact plate.

[0013] As a further embodiment of this utility model: the top two sides of the cover plate body are provided with pole holes, and the middle part is provided with mounting hole one and mounting hole two. The cover plate body is provided with an annular sealing ring on the outside of the elastic buffer assembly.

[0014] The beneficial effects of this utility model are:

[0015] By uniformly setting multiple sliding grooves along the edge at the bottom of the cover plate body, and adapting and installing elastic buffer components on the outside of the sliding grooves, when the lithium-ion battery cell expands during use, it will squeeze the buffer plate on the side. The sliding block installed at the top of the buffer plate is slidably connected to the sliding groove. At the same time, the buffer spring is compressed, and the contact plate on the other side of the buffer spring that contacts the aluminum shell remains in its original state due to the fixed state. That is, the expansion pressure of the battery cell is absorbed by the deformation of the buffer spring. The purpose is to absorb the expansion pressure of the battery cell by comprehensively absorbing the expansion pressure of the battery's internal peripheral side, so that when the battery is assembled into a battery pack, there is no need to tighten and prevent expansion from the outside of the battery. This achieves the function of avoiding the expansion and deformation of the battery aluminum shell, while making the battery have a more stable anti-expansion capability when assembled into a battery pack. It can also effectively prevent the welding point of the welding mother tape between the top terminals of the battery pack from shifting at the center position of the battery pack.

[0016] Furthermore, since the two sides of the sliding block are in contact with the adjacent sides of the sliding groove, the sliding block is restricted in its direction of movement during the squeezing process. Therefore, the buffer plate connected to the sliding block will not shift to the side under the reaction force, that is, its reaction force will not squeeze the battery cell laterally. Thus, the connection between the top of the cell and the external terminal post will not be subjected to lateral torque. In other words, the sliding groove avoids the terminal post being subjected to lateral torque by sliding in contact with the sliding block, thereby maintaining the stability of the terminal post. Attached Figure Description

[0017] The present invention will be further described below with reference to the accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model;

[0019] Figure 2 This is a side view of the present invention;

[0020] Figure 3 This is a side view of the elastic buffer component of this utility model;

[0021] Figure 4 This is a partial structural diagram of the inner side of the cover plate body of this utility model.

[0022] In the diagram: 1. Cover plate body; 2. Pole post hole; 3. Mounting hole one; 4. Mounting hole two; 5. Elastic buffer assembly; 501. Contact plate; 502. Buffer spring; 503. Buffer plate; 504. Light-reducing groove; 505. Sliding block; 6. Sliding groove; 7. Sealing ring. Detailed Implementation

[0023] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present utility model.

[0024] like Figures 1 to 4 As shown, a square aluminum shell cover with buffer expansion force includes a cover body 1. Multiple sliding grooves 6 are evenly opened along the edge of the bottom end of the cover body 1. An elastic buffer component 5 is installed at the bottom end of the cover body 1 to fit each sliding groove 6. The elastic buffer component 5 is used to cooperate with the adjacent sliding grooves 6 to absorb the pressure of cell deformation on the outer aluminum shell of the battery and prevent the aluminum shell from deforming.

[0025] It should be noted that ten sliding grooves 6 are opened on both sides of the bottom surface of the cover plate body 1. Figure 1 However, the bottom surface of the cover plate body 1 may include, but is not limited to, ten sliding grooves 6. Sliding grooves 6 may also be opened on both sides perpendicular to the long side of the bottom surface of the cover plate body 1 to improve the cover plate's adaptability to the expansion and deformation of the battery cell.

[0026] The elastic buffer assembly 5 includes a contact plate 501 fixedly connected to one side of the bottom end of the cover plate body 1. Four buffer springs 502 are evenly installed on the inner side of the contact plate 501 near the sliding groove 6 in the vertical plane. A buffer plate 503 is fixedly connected between the sides of each buffer spring 502 away from the contact plate 501.

[0027] A sliding block 505 is fixedly connected to the side of the buffer plate 503 near the sliding groove 6. The sliding block 505 is slidably connected to the sliding groove 6, and the two sides of the sliding block 505 are in contact with the side walls of the adjacent side of the sliding groove 6.

[0028] It should be noted that when the cell inside the lithium-ion battery swells due to the charging and discharging reaction, the cell first comes into contact with the buffer plate 503. The buffer plate 503 compresses the buffer spring 502, and the buffer spring 502 absorbs the deformation pressure through compression. The contact plate 501, which is fixed on the other side of the buffer spring 502, remains in its original state. That is, the outer side of the contact plate 501 will not apply pressure to the inner side of the aluminum shell of the battery, thereby avoiding the compression of the aluminum shell by the cell swelling and realizing the buffer function of the expansion force of the aluminum shell.

[0029] Furthermore, since the buffer plate 503 is in a close fit with the adjacent sides of the sliding groove 6, when the expanded cell applies pressure to the buffer plate 503, the direction of the reaction force of the buffer plate 503 is always perpendicular to the contact plate 501. The purpose is that, since the expansion of the cell is irregular, if the side of the sliding block 505 in contact with the sliding groove 6 is not limited, the force of the buffer plate 503 acting on the cell in the opposite direction will be a lateral force that is obliquely in contact with the expansion surface of the cell. This lateral force will generate a torque between the cell and the terminal connecting the battery casing. As the lateral force acts for a longer period of time, it will cause the terminal to loosen. By limiting the sliding direction of the sliding block 505, the lateral force of the buffer plate 503 on the cell is avoided, thereby maintaining the stability of the battery terminal while avoiding the expansion of the battery aluminum casing.

[0030] Multiple lightweight grooves 504 are evenly opened on the outer side of the contact plate 501 along the vertical surface. The purpose is to reduce the overall weight of the cover plate while achieving the anti-expansion function of the cover plate.

[0031] The bottom height of the buffer plate 503 is less than the bottom height of the contact plate 501 (see...). Figure 2 This allows the bottom of the contact plate 501 to be welded to the bottom of the aluminum shell after the cover plate is installed, thus fixing it in place. Meanwhile, the buffer plate 503, being shorter, does not contact the bottom of the aluminum shell, and is therefore in a compressible state.

[0032] The top two sides of the cover plate body 1 are provided with pole hole 2, and the middle part is provided with mounting hole 1 3 and mounting hole 2 4. The cover plate body 1 is provided with sealing ring 7 on the outside of elastic buffer component 5.

[0033] It should be noted that the cover plate body 1 is inserted into the inside of the lithium battery, and the terminal of the cell extends to the outside of the battery through the terminal hole 2. When the battery is assembled into a battery pack, it is assembled in series and parallel by welding a tin mother tape to the top of the terminal protruding from the terminal hole 2. Mounting hole 3 and mounting hole 4 are used to cooperate with the installation of structures such as safety valve and dust cap. In addition, the sealing ring 7 is used to prevent the interaction between the internal and external environments of the battery and improve the sealing of the battery after the cover plate is installed.

[0034] The above description provides a detailed account of one embodiment of the present invention. However, this description is merely a preferred embodiment and should not be construed as limiting the scope of the present invention. All equivalent variations and improvements made within the scope of the claims of the present invention should still fall within the patent coverage of the present invention.

Claims

1. A square aluminum shell cover plate having a cushioning expansion force, comprising a cover plate body (1), characterized in that, The cover plate body (1) is uniformly provided with a plurality of sliding grooves (6) at the bottom end, and the cover plate body (1) is adapted to the sliding grooves (6) and is provided with an elastic buffer assembly (5) at the bottom end, and the elastic buffer assembly (5) is used for cooperating with adjacent sliding grooves (6) to avoid deformation of the battery aluminum shell.

2. The square aluminum can end having cushioning bulging force according to claim 1, wherein, The elastic buffer assembly (5) comprises a contact plate (501) fixedly connected to one side of the bottom end of the cover plate body (1), a plurality of buffer springs (502) are uniformly arranged on one side of the contact plate (501) close to the sliding groove (6) in the vertical plane, and a buffer plate (503) is fixedly connected between the sides of the buffer springs (502) away from the contact plate (501).

3. The square aluminum can end having cushioning bulging strength according to claim 2, wherein The buffer plate (503) is fixedly connected with a sliding block (505) on the side close to the sliding groove (6), the sliding block (505) is in sliding connection with the sliding groove (6), and the sliding block (505) is in contact with the side walls on the adjacent sides of the sliding groove (6).

4. The square aluminum can end having cushioning bulging strength according to claim 2, wherein The outer side of the contact plate (501) is uniformly provided with a plurality of light slots (504) along the vertical plane.

5. The square aluminum can end having cushioning bulging strength according to claim 2 wherein, The bottom height of the buffer plate (503) is less than the bottom height of the contact plate (501).

6. The square aluminum can end having cushioning bulging strength according to claim 1 wherein, The cover plate body (1) is provided with a polar post hole (2) at the top end on both sides, and is provided with a mounting hole one (3) and a mounting hole two (4) at the middle, and the cover plate body (1) is provided with a ring-shaped sealing ring (7) outside the elastic buffer assembly (5).

Images