Battery elastic sheet device and battery module

Abstract

The utility model provides a battery elastic piece device, which comprises an enclosure frame, a battery elastic piece and a battery elastic piece, wherein the enclosure frame is of a concentric-square-shaped frame structure; the elastic piece is of a wave-shaped structure, and the side edge of the elastic piece is fixed to the inner side wall of the enclosure frame; the supporting plates are fixed on the upper surface and the lower surface of the elastic sheet; according to the utility model, the elastic sheet structure is used for replacing foam in the module and serves as a buffer material in the middle of the battery cell, and the battery cell is always in a stable high-pretightening-force state in the circulation process by utilizing the advantages that the metal material is not easy to deform and the elastic sheet is good in compression resilience; the problem of insufficient pre-tightening force of the battery cell in the middle and later periods is solved, the performance of the battery cell is fully exerted, and the cycle life is prolonged.

Description

Technical Field

[0001] The utility model relates to the technical field of power and energy storage equipment, and in particular to a battery shrapnel device and a battery module. Background Art

[0002] During the charging and discharging process of power batteries, especially at high rate discharge, the battery cells will expand, resulting in an increase in thickness. Currently, most modules use the rebound of compressed foam to provide battery cell preload, but the preload provided by the foam will decrease with the increase in the number of cycles and the passage of time, resulting in insufficient preload in the middle and late stages of the battery cells, affecting the performance and cycle life of the battery cells.

[0003] To this end, we propose a battery spring device and a battery module to solve the problem of insufficient pre-tightening force of the battery cell in the middle and late stages. Utility Model Content

[0004] The purpose of the utility model is to solve the shortcomings of the prior art. In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0005] A battery spring clip device comprises: a surrounding frame, the surrounding frame is a circular frame structure; a spring clip, the spring clip is a wavy structure, and the side edge of the spring clip is fixed to the inner wall of the surrounding frame; a support plate, the upper and lower surfaces of the spring clip are fixed with the support plate; and an insulating film, the insulating film is adhered to the outer surface of the support plate, and the spring clip takes advantage of the good compression resilience to ensure that the battery cell is always in a stable high preload state during the cycle process, thereby solving the problem of insufficient preload of the battery cell in the middle and late stages, so that the battery cell performance is fully exerted and the cycle life is extended.

[0006] Further preferably, when the spring sheet is deformed under pressure, a height H of the spring sheet is greater than a thickness of the surrounding frame.

[0007] Further preferably, the length of the support plate is 1-2 mm greater than the length of the surrounding frame, and the width of the support plate is 1-2 mm greater than the width of the surrounding frame.

[0008] Further preferably, the length and width specifications of the insulating film are consistent with those of the support plate.

[0009] Further preferably, the spring sheet and the support plate are both made of metal materials, preferably steel or aluminum.

[0010] A battery module comprises a battery cell, a side plate, a module body, a top cover and the above-mentioned spring device; the module body, the side plate and the top cover enclose a closed space to form a receiving cavity, and the receiving cavity is used to receive a plurality of the battery cells and a plurality of the spring devices.

[0011] Further preferably, a plurality of the spring clip devices are arranged in parallel, and the battery core is arranged between adjacent spring clip devices.

[0012] Compared with the prior art, the beneficial effects of the utility model are:

[0013] The utility model replaces the foam in the module with a spring structure to serve as a buffer material in the middle of the battery cell. The advantages of the metal material being not easily deformed and the spring compression having good resilience are utilized to ensure that the battery cell is always in a stable high preload state during the cycle process, thereby solving the problem of insufficient preload of the battery cell in the middle and late stages, allowing the battery cell performance to be fully utilized and extending the cycle life. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the explosion of the shrapnel device;

[0015] Figure 2 This is a schematic diagram of the structure of the shrapnel in the utility model;

[0016] Figure 3 It is a schematic diagram of the assembly of the shrapnel device;

[0017] Figure 4 Schematic diagram of the explosion of the battery module.

[0018] In the figure: a spring piece 1, a surrounding frame 2, a support plate 3, an insulating film 4, a spring piece device 10, a battery cell 20, a side plate 30, a module body 40, and a top cover 50. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all of the embodiments.

[0020] Reference Figure 1-Figure 3 A battery shrapnel device comprises: a frame 2, the frame 2 is a circular frame structure; a shrapnel 1, the shrapnel 1 is a wavy structure, and the side edge of the shrapnel 1 is fixed on the inner wall of the frame 2; a support plate 3, the support plate 3 is fixed on the upper and lower surfaces of the shrapnel 1; and an insulating film 4, the insulating film 4 is adhered to the outer surface of the support plate 3.

[0021] In the embodiment: the frame 2 can be made of EVA material, the spring piece 1 is first placed in the EVA frame 2 and fixed, and then connected with the upper and lower metal support plates 2, and finally the insulating film 4 is attached to the surface of the metal support plate 2. By taking advantage of the good compression resilience of the spring piece, the battery cell is always in a stable high preload state during the cycle process, solving the problem of insufficient preload of the battery cell in the middle and late stages, so that the battery cell performance can be fully exerted and the cycle life can be extended.

[0022] In the embodiment, the insulating film 4 can be made of any material such as PET, PC or PI.

[0023] When the spring sheet 1 is deformed under pressure, the height H of the spring sheet 1 is greater than the thickness of the frame 2, that is, the movement of the two side support plates 3 will not be affected by the thickness of the frame 2, the length of the support plate 3 is 1-2 mm greater than the length of the frame 2, the width of the support plate 3 is 1-2 mm greater than the width of the frame 2, and the length and width specifications of the insulating film 4 are consistent with those of the support plate 3.

[0024] In the embodiment: the dimensions of the support plate 3 in the length and width directions are 2 mm larger than the dimensions of the frame 2 in the length and width directions, that is, the support plates 3 are arranged on both sides of the frame 2, and when the spring sheet 1 is compressed and deformed, the height H of the spring sheet 1 is greater than the thickness of the frame 2, that is, the displacement of the support plates 3 on both sides will not be affected by the thickness of the frame 2.

[0025] The spring piece 1 and the support plate 3 are both made of metal materials.

[0026] In the embodiment: the material of the spring piece 1 and the support plate 3 can be steel or aluminum.

[0027] Reference Figure 4 A battery module comprises a battery cell 20, a side plate 30, a module body 40, a top cover 50 and any one of the above-mentioned spring clip devices 10; the module body 40, the side plate 30 and the top cover 50 enclose a closed space to form a receiving cavity, and the receiving cavity is used to receive a plurality of the battery cells 20 and a plurality of the spring clip devices 10, and the plurality of the spring clip devices 10 are arranged in parallel, and the battery cells 20 are arranged between adjacent spring clip devices 10. Example

[0028] After the shrapnel device 10 is assembled, Figure 4 The method shown in the figure is placed in the middle of the battery cell 20, the battery cells 20 are stacked, and then the metal side plates 30 are used to squeeze the stacked battery cell components through external force so that the metal spring device 10 obtains the desired compression ratio and remains stationary. At this time, the battery cell can obtain a stable high preload during the charge and discharge cycle.

[0029] In the embodiment: the metal spring structure is also used inside the side plates 30 on both sides of the battery module to provide a certain expansion space for the module when it expands, while providing a stable high pre-tightening force to ensure the cycle life of the battery cell.

[0030] When the battery cell is in a free state, the metal shrapnel in the module has been pre-compressed to a certain compression ratio, which is conducive to the battery cell cycle. When the battery cell continues to charge, the thickness of the battery cell will continue to expand, and the metal shrapnel will continue to compress, ensuring the normal space for the battery cell to expand. When the battery cell is discharged from a fully charged state, the power and the thickness of the battery cell will continue to decrease. At this time, the extrusion force on the metal shrapnel becomes smaller, and the metal shrapnel has space to rebound, and the battery cell continues to maintain the desired preload.

[0031] The battery spring device provided by the utility model utilizes the characteristics that metal material is not easy to deform and the spring has good compression resilience, so that the battery cell is always in a stable high pre-tightening force state during the cycle process, avoiding insufficient pre-tightening force of the battery cell in the late stage of the cycle.

Claims

1. A battery shrapnel device, characterized in that: include: A surrounding frame, wherein the surrounding frame is a circular frame structure; A spring sheet, the spring sheet is a wave-shaped structure, and the side edge of the spring sheet is fixed to the inner side wall of the surrounding frame; A support plate, with support plates fixed on the upper and lower surfaces of the spring sheet; An insulating film is adhered to the outer surface of the support plate.

2. A battery spring device according to claim 1, characterized in that: When the spring sheet is deformed under pressure, the height H of the spring sheet is greater than the thickness of the surrounding frame.

3. A battery spring device according to claim 1, characterized in that: The length of the support plate is 1-2 mm greater than the length of the surrounding frame, and the width of the support plate is 1-2 mm greater than the width of the surrounding frame.

4. A battery spring device according to claim 1, characterized in that: The length and width specifications of the insulating film are consistent with those of the support plate.

5. The battery spring device according to claim 1, characterized in that: The spring sheet and the support plate are both made of metal.

6. A battery module, characterized in that: It comprises a battery cell, a side plate, a module body, a top cover and a spring device as described in any one of claims 1 to 5; the module body, the side plate and the top cover enclose a closed space to form a receiving cavity, and the receiving cavity is used to receive a plurality of the battery cells and a plurality of the spring devices.

7. A battery module according to claim 6, characterized in that: A plurality of the spring devices are arranged in parallel, and the battery core is arranged between adjacent spring devices.

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