Battery cover plate and single battery

Abstract

The utility model belongs to the technical field of batteries, and discloses a battery cover plate and a single battery. The battery cover plate comprises a stainless steel cover plate and an anti-explosion piece, a pressure relief hole is formed in the stainless steel cover plate, a buffer structure is arranged at the position, with the preset distance, of the outer edge of the pressure relief hole in a surrounding mode, and the buffer structure can deform in the circumferential direction of the pressure relief hole when the temperature changes; the anti-explosion piece is welded and fixed to the pressure relief hole. According to the battery cover plate, the deformation quantity generated by the stainless steel cover plate due to the temperature change cannot pull or compress the anti-explosion sheet in the pressure relief hole, the fastening connection of the anti-explosion sheet and the pressure relief hole is ensured, the anti-explosion sheet is protected from failure due to the deformation, the welding quality of the anti-explosion sheet and the pressure relief hole is improved, the service life of the battery cover plate is prolonged, and the safety of the battery cover plate is improved. And the use safety and reliability are improved.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery cover and a single battery. Background Art

[0002] With the rapid development of prismatic aluminum-cased battery technology, batteries made with aluminum structural components have been widely used in various fields due to their lightweight and cost-effectiveness. However, due to the strength limitations of aluminum, achieving the required strength standards often requires increasing the material thickness, which directly affects the battery's internal space and energy density. To overcome this bottleneck, stainless steel, with its superior high strength, corrosion resistance, and excellent mechanical properties, has become a potential alternative material.

[0003] Without compromising battery strength, using stainless steel as the structural material can significantly reduce material thickness by as much as 50% to 70%, greatly improving the battery's internal space utilization and potentially further enhancing its energy density and performance. However, switching from aluminum to stainless steel for prismatic battery components presents some technical challenges. For example, the thinness of stainless steel requires very fine notches on the explosion-proof valve's opening, which increases the difficulty of welding.

[0004] During the welding process, the joint between the top cover and the explosion-proof valve is at increased risk of damage due to thermal stress generated by welding heating and cooling. This can cause cracking in the explosion-proof valve, leading to leakage from the valve and even potential safety hazards such as battery leakage. Furthermore, high-temperature welding can cause deformation of the top cover, complicating subsequent reshaping and requiring manual labor. This not only increases production costs but can also lead to an increase in defective product rates, compromising overall product quality.

[0005] Therefore, there is an urgent need to provide a new type of battery cover and single battery to solve the above technical problems in the prior art. Utility Model Content

[0006] The purpose of the utility model is to provide a battery cover plate, which can improve welding quality, extend the service life of the battery cover plate, and improve its safety and reliability in use.

[0007] To achieve this purpose, the present invention adopts the following technical solutions:

[0008] The battery cover includes a stainless steel cover and an explosion-proof plate. The stainless steel cover is provided with a pressure relief hole. A buffer structure is arranged around the outer edge of the pressure relief hole at a preset distance. The buffer structure can deform along the circumference of the pressure relief hole when the temperature changes; the explosion-proof plate is welded and fixed to the pressure relief hole.

[0009] Optionally, the buffer structure includes a plurality of peak structures and / or a plurality of trough structures.

[0010] Optionally, the buffer structure includes a peak structure, the top wall of the peak structure is higher than the top wall of the stainless steel cover plate, and the bottom wall of the peak structure is not higher than the top wall of the stainless steel cover plate.

[0011] Optionally, an installation groove is formed on the outer edge of the bottom port of the pressure relief hole, and the explosion-proof plate is installed in the installation groove.

[0012] Optionally, a reinforcing rib is provided at the top port of the pressure relief hole and at a position corresponding to the mounting groove.

[0013] Optionally, the battery cover further includes an upper plastic part and a pole assembly, the stainless steel cover is provided with a mounting hole for mounting the pole assembly, and the upper plastic part is clamped between the pole assembly and the top wall of the stainless steel cover.

[0014] Optionally, either one of the bottom wall of the upper plastic component and the top wall of the stainless steel cover plate is provided with a convex positioning pin, and the other one is provided with a concave positioning hole.

[0015] Optionally, the pole assembly includes an upper pole and a lower pole, the upper pole is provided with a first connecting hole, the upper plastic part is provided with a second connecting hole, and the lower pole is provided with a connecting column, which is cooperated to pass through the first connecting hole, the second connecting hole and the mounting hole.

[0016] Optionally, a limiting groove is recessed on the top wall of the upper plastic component, and the upper pole is fitted in the limiting groove.

[0017] Another object of the present invention is to provide a single cell battery, which includes the battery cover as described in any of the above solutions.

[0018] Beneficial effects:

[0019] The battery cover plate in the present invention includes a stainless steel cover plate and an explosion-proof plate, which is welded and fixed to the pressure relief hole of the stainless steel cover plate. Since stainless steel will undergo large deformation during welding, a buffer structure is arranged around the outer edge of the pressure relief hole at a preset distance. The buffer structure can deform when welding generates heat, thereby buffering the deformation of the stainless steel cover plate during welding, and also buffering the deformation after cooling, so that the deformation of the stainless steel cover plate caused by temperature change will not pull or compress the explosion-proof plate in the pressure relief hole, ensuring the tight connection between the explosion-proof plate and the pressure relief hole, and protecting the explosion-proof plate from failure due to deformation, thereby improving the welding quality of the explosion-proof plate and the pressure relief hole, extending the service life of the battery cover plate, and improving its safety and reliability in use. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 This is an exploded view of a battery cover provided by a specific embodiment of the present utility model;

[0021] Figure 2 It is a partial enlarged view of the cross section of the pressure relief hole of the stainless steel cover provided in a specific embodiment of the present invention.

[0022] In the picture:

[0023] 100, stainless steel cover; 110, pressure relief hole; 111, buffer structure; 112, mounting groove; 113, reinforcing rib; 120, positioning pin; 130, mounting hole;

[0024] 200, explosion-proof disk;

[0025] 310. Upper pole; 311. First connecting hole;

[0026] 320, lower pole; 321, connecting pole;

[0027] 400, upper plastic part; 410, positioning hole; 420, second connecting hole; 430, limiting groove;

[0028] 500. Remove the plastic parts. DETAILED DESCRIPTION

[0029] The present invention will be further described in detail below with reference to the accompanying drawings and examples. It should be understood that the specific embodiments described herein are intended only to illustrate the present invention and are not intended to limit the present invention. It should also be noted that, for ease of description, the accompanying drawings only illustrate portions relevant to the present invention, not all of its components.

[0030] In the description of this utility model, unless otherwise specified or limited, the terms "connected," "connect," and "fixed" should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; internal communication between two components or interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0031] In the present invention, unless otherwise expressly specified or limited, a first feature being "above" or "below" a second feature may include the first and second features being in direct contact, or may include the first and second features being in contact not directly but through another feature between them. Moreover, a first feature being "above," "above," and "above" a second feature may include the first feature being directly above or obliquely above the second feature, or may simply mean that the first feature is higher in level than the second feature. A first feature being "below," "below," and "below" a second feature may include the first feature being directly below or obliquely below the second feature, or may simply mean that the first feature is lower in level than the second feature.

[0032] In the description of this embodiment, the terms "upper," "lower," "right," and other orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings and are intended solely for ease of description and simplified operation. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limitations on the present invention. Furthermore, the terms "first" and "second" are used solely for descriptive purposes and have no special meaning.

[0033] like Figure 1 and Figure 2 As shown, the battery cover includes a stainless steel cover 100 and an explosion-proof plate 200. The stainless steel cover 100 is provided with a pressure relief hole 110. A buffer structure 111 is arranged around the outer edge of the pressure relief hole 110 at a preset distance. The buffer structure 111 can deform along the circumference of the pressure relief hole 110 when the temperature changes; the explosion-proof plate 200 is welded and fixed to the pressure relief hole 110.

[0034] The battery cover plate in this embodiment includes a stainless steel cover plate 100 and an explosion-proof plate 200. The explosion-proof plate 200 is welded and fixed to the pressure relief hole 110 of the stainless steel cover plate 100. Since stainless steel will undergo large deformation during welding, a buffer structure 111 is arranged around the outer edge of the pressure relief hole 110 at a preset distance. The buffer structure 111 can deform when welding generates heat, thereby buffering the deformation of the stainless steel cover plate 100 during welding, and also buffering the deformation after cooling, so that the deformation of the stainless steel cover plate 100 caused by temperature change will not pull or compress the explosion-proof plate 200 in the pressure relief hole 110, ensuring the tight connection between the explosion-proof plate 200 and the pressure relief hole 110, and protecting the explosion-proof plate 200 from failure due to deformation, thereby improving the welding quality of the explosion-proof plate 200 and the pressure relief hole 110, extending the service life of the battery cover plate, and improving its safety and reliability.

[0035] Furthermore, the battery cover also includes an upper plastic part 400 and a pole assembly. The stainless steel cover 100 is provided with a mounting hole 130 for mounting the pole assembly. The upper plastic part 400 is sandwiched between the pole assembly and the top wall of the stainless steel cover 100. The pole assembly is used to transmit battery power to external devices, thereby providing power, while the upper plastic part 400 can insulate the pole assembly from the stainless steel cover 100, preventing short circuits and leakage, thereby ensuring the safety of the battery cover and the single battery using the battery cover.

[0036] Optionally, one of the bottom wall of the upper plastic part 400 and the top wall of the stainless steel cover plate 100 is provided with a locating pin 120, and the other is provided with a locating hole 410. Specifically, the top wall of the stainless steel cover plate 100 is provided with two locating pins 120, which are symmetrically distributed along the center of the mounting hole 130, and the bottom wall of the upper plastic part 400 is provided with two locating holes 410 corresponding to the locating pins 120, thereby achieving the positioning of the upper plastic part 400 and the stainless steel cover plate 100, and also preventing the upper plastic part 400 from twisting on the stainless steel cover plate 100, playing an anti-torsion role, and improving the connection stability of the upper plastic part 400 and the stainless steel cover plate 100.

[0037] Please continue to refer to Figure 1 Optionally, the pole assembly includes an upper pole 310 and a lower pole 320. The upper pole 310 is provided with a first connection hole 311, the upper plastic part 400 is provided with a second connection hole 420, and the lower pole 320 is provided with a connection post 321. The connection post 321 is cooperatively inserted through the first connection hole 311, the second connection hole 420, and the mounting hole 130. The upper pole 310 and the lower pole 320 are fixed together by stamping, so that the connection post 321 of the lower pole 320 sequentially passes through the mounting hole 130, the second connection post 321, and the first connection post 321 to be fixed to the upper pole 310, thereby making the connection more stable.

[0038] In this embodiment, a retaining groove 430 is recessed in the top wall of the upper plastic member 400, and the upper pole 310 is cooperatively mounted in the retaining groove 430. The retaining groove 430 can limit the upper pole 310, thereby achieving a torsion-resistant effect on the upper pole 310, preventing the pole assembly from loosening and rotating, and improving the stability of the connection.

[0039] The battery cover in this embodiment also includes a lower plastic part 500, which is used to insulate the lower pole 320 from the battery cover to avoid leakage and short circuit between the pole assembly and the battery cover, thereby improving the safety and reliability of the battery cover.

[0040] Please refer to Figure 2The buffer structure 111 includes a plurality of crest structures and / or a plurality of trough structures. That is, the buffer structure 111 is a protruding structure formed by stamping or extrusion, which can be convex upward or downward. The upward protrusion is a crest structure, and the downward protrusion is a trough structure. The crest structures and trough structures can also be alternately arranged to form a wavy structure, which will not be described in detail here.

[0041] In this embodiment, the buffer structure 111 comprises a wave crest structure, the top wall of which is higher than the top wall of the stainless steel cover plate 100, and the bottom wall of which is no higher than the top wall of the stainless steel cover plate 100. The provision of the wave crest structure can weaken the structural strength of the area surrounding the pressure relief hole 110. When deformation occurs due to temperature changes, the wave crest structure deforms first, thereby preventing the explosion-proof disk 200 in the pressure relief hole 110 from being pulled and damaged.

[0042] Furthermore, a mounting groove 112 is formed at the outer edge of the bottom port of the pressure relief hole 110, and the explosion-proof disc 200 is mounted in the mounting groove 112. The mounting groove 112 can limit and position the explosion-proof disc 200, thereby facilitating assembly of the explosion-proof disc 200, increasing the contact area between the explosion-proof disc 200 and the pressure relief hole 110, improving welding strength, and reducing the height space occupied by the explosion-proof disc 200, thereby increasing the energy density of the single battery using the battery cover.

[0043] In this embodiment, a reinforcing rib 113 is provided at the top end of the pressure relief hole 110, corresponding to the mounting groove 112. The reinforcing rib 113 improves the mechanical strength of the battery cover at a location where the mechanical strength is reduced due to the installation of the mounting groove 112, thereby ensuring that the mechanical strength of the battery cover is not affected.

[0044] Another object of the present invention is to provide a single battery cell, which includes the battery cover plate as described in any of the above solutions. The battery cell uses the above battery cover plate, which includes all the beneficial effects of the above battery cover plate, which will not be repeated here.

[0045] Obviously, the above-described embodiments of the present invention are merely examples for the purpose of clearly illustrating the present invention and are not intended to limit the manner in which the present invention is to be implemented. A person skilled in the art would be able to make various obvious changes, readjustments, and substitutions without departing from the scope of protection of the present invention. It is not necessary and impossible to enumerate all embodiments here. Any modifications, equivalent substitutions, and improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the claims of the present invention.

Claims

1. Battery cover, characterized in that: include: A stainless steel cover plate (100), wherein the stainless steel cover plate (100) is provided with a pressure relief hole (110), a buffer structure (111) is provided around the outer edge of the pressure relief hole (110) at a preset distance, and the buffer structure (111) is capable of deforming along the circumference of the pressure relief hole (110) when the temperature changes; An explosion-proof disc (200) is welded and fixed to the pressure relief hole (110).

2. The battery cover according to claim 1, characterized in that: The buffer structure (111) includes a plurality of peak structures and / or a plurality of trough structures.

3. The battery cover according to claim 2, characterized in that: The buffer structure (111) comprises a wave crest structure, the top wall of the wave crest structure is higher than the top wall of the stainless steel cover plate (100), and the bottom wall of the wave crest structure is not higher than the top wall of the stainless steel cover plate (100).

4. The battery cover according to claim 1, characterized in that: An outer edge of the bottom port of the pressure relief hole (110) is formed with a mounting groove (112), and the explosion-proof disk (200) is mounted in the mounting groove (112).

5. The battery cover according to claim 4, characterized in that: A reinforcing rib (113) is provided at the top port of the pressure relief hole (110) and at a position corresponding to the mounting groove (112).

6. The battery cover according to claim 1, characterized in that: The battery cover plate further comprises an upper plastic part (400) and a pole assembly, the stainless steel cover plate (100) is provided with a mounting hole (130) for mounting the pole assembly, and the upper plastic part (400) is sandwiched between the pole assembly and the top wall of the stainless steel cover plate (100).

7. The battery cover according to claim 6, characterized in that: Either one of the bottom wall of the upper plastic part (400) or the top wall of the stainless steel cover plate (100) is provided with a convex positioning pin (120), and the other is provided with a concave positioning hole (410).

8. The battery cover according to claim 6, characterized in that: The pole assembly comprises an upper pole (310) and a lower pole (320), wherein the upper pole (310) is provided with a first connection hole (311), the upper plastic part (400) is provided with a second connection hole (420), and the lower pole (320) is provided with a connection column (321), wherein the connection column (321) is cooperatively arranged to penetrate the first connection hole (311), the second connection hole (420) and the mounting hole (130).

9. The battery cover according to claim 8, characterized in that: A limiting groove (430) is recessed on the top wall of the upper plastic part (400), and the upper pole (310) is fitted into the limiting groove (430).

10. A single cell battery, characterized in that: The invention comprises the battery cover according to any one of claims 1 to 9.

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