Battery top cover structure and square battery

Abstract

The utility model provides a battery top cover structure and a square battery. The battery top cover structure comprises a pole, a pole pressing plate, a top cover assembly, a sealing ring and a connecting piece, the pole comprises a leading-out part, a sealing part and a welding part, the peripheral wall of the sealing part is an inclined surface, the maximum cross section area of the sealing part is larger than that of the leading-out part, and the welding part is welded on the sealing part. One side of the sealing ring abuts against the sealing part and the welding part, and the other side of the sealing ring abuts against the top cover assembly. The sealing ring is in extrusion sealing with the peripheral wall of the inclined-surface-shaped sealing part in the vertical direction and is in extrusion sealing with the welding part in the horizontal direction, so that double airtight protection is formed, the structure is simple, and the airtight performance of the battery is improved. Furthermore, the welding track can be identified by welding after the pole and the connecting piece are spliced, so that the welding is visualized and firm, and the yield of the battery is improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of battery pole structures, and in particular to a battery top cover structure and a square battery. Background Art

[0002] The battery top cover and the positive / negative electrode are usually sealed by a sealing ring. The strength of the sealing performance between the sealing ring and the positive electrode directly affects the normal operation of the entire battery. The existing electrode usually adopts a cylindrical structure, and can only produce an extrusion seal in the horizontal direction when assembled with the sealing ring. The sealing ring is prone to loosening during transportation, vibration, charging and discharging, resulting in poor airtightness between the top cover and the positive / negative electrode, causing the battery seal to fail, thereby causing leakage of the electrolyte, causing the battery to short circuit or capacity decay, and posing a safety hazard to the battery.

[0003] In order to solve the above problems, a Chinese patent with application number CN201720649475.2 discloses a power battery top cover, including a top cover sheet, a positive electrode column, a negative electrode column, a conductive plastic ring, an insulating plastic ring and a sealing ring; a first annular positioning groove is respectively provided on the positive electrode bottom plate and the negative electrode bottom plate, and the sealing ring is located in the first annular positioning groove; when the positive electrode column / negative electrode column is inserted into the corresponding mounting hole, the two sides of the sealing ring are respectively in conflict with the top cover sheet and the positive electrode bottom plate / negative electrode bottom plate; a plurality of plastic ring positioning holes are opened on the top cover sheet, and the top hole diameter thereof is smaller than the internal hole diameter; a positioning column is convexly provided on the conductive plastic ring and / or the insulating plastic ring, and the cross-sectional diameter of the positioning column is larger than the minimum hole diameter of the plastic ring positioning hole.

[0004] The above-mentioned power battery top cover is equipped with a positioning mechanism to position the sealing ring, which can effectively prevent the sealing ring from deforming during the injection molding process; the conical positioning hole is also used to ensure the reliable connection between the conductive plastic ring / insulating plastic ring and the top cover sheet, which has good air tightness and reliability and improves the sealing performance of the sealing ring. However, the additional positioning mechanism occupies a large battery space, making the battery top cover structure complicated and reducing production efficiency.

[0005] Therefore, a battery top cover structure with good sealing effect and relatively simple structure is needed. Utility Model Content

[0006] The purpose of the present invention is to overcome the deficiencies in the prior art and to provide a battery top cover structure and a square battery with good sealing effect and relatively simple structure.

[0007] The purpose of this disclosure is achieved through the following technical solutions:

[0008] A battery top cover structure comprises a pole, a pole pressure plate, a top cover assembly and a sealing ring, wherein the pole pressure plate is connected to the pole, the top cover assembly is provided with a pole hole, the sealing ring is arranged in the pole hole, the pole is passed through the pole hole, the pole comprises a lead-out portion, a sealing portion and a welding portion, the lead-out portion is connected to the sealing portion, the welding portion is connected to the outer peripheral wall of the sealing portion, the outer peripheral wall of the sealing portion is an inclined surface, the maximum cross-sectional area of ​​the sealing portion is greater than the maximum cross-sectional area of ​​the lead-out portion, the sealing ring is sleeved on the outer peripheral wall of the sealing portion, one side of the sealing ring abuts against the sealing portion and the welding portion, and the other side of the sealing ring abuts against the top cover assembly.

[0009] In one embodiment, the lead-out portion, the sealing portion and the welding portion are an integrally formed structure.

[0010] In one embodiment, the sealing portion is welded to the lead-out portion and the welding portion respectively.

[0011] In one embodiment, the lead-out portion is cylindrical; and / or,

[0012] The sealing portion is in the shape of a truncated cone; and / or,

[0013] The welding portion is in the shape of a circular ring.

[0014] In one embodiment, the inclined surface of the outer peripheral wall of the sealing portion has an inclination angle of 15° to 45°.

[0015] In one embodiment, the battery top cover structure further includes a connecting piece, and the connecting piece is welded to the sealing portion and the welding portion respectively.

[0016] In one embodiment, the top cover assembly includes a cover plate, an upper plastic and a lower plastic, the pole hole includes a first through hole, a second through hole and a third through hole that are connected in sequence, the first through hole is opened in the upper plastic, the second through hole is opened in the cover plate, the third through hole is opened in the lower plastic, and the pole is sequentially penetrated through the first through hole, the second through hole and the third through hole;

[0017] The upper plastic portion is located in the second through hole, and the upper plastic protrudes from one side of the cover plate. The upper plastic is provided with a limiting groove, and the pole pressure plate is located in the limiting groove. The sealing ring portion is located in the second through hole, and the lower plastic is located on the other side of the cover plate. The sealing ring extends into the third through hole, and the upper plastic, the cover plate and the lower plastic are all in contact with the sealing ring.

[0018] In one of the embodiments, the pole is welded to the pole pressure plate.

[0019] In one of the embodiments, the battery top cover structure further includes an explosion-proof valve, an explosion-proof hole is opened at the center of the cover plate, and the explosion-proof valve is located in the explosion-proof hole.

[0020] The present application also provides a square battery, comprising the battery top cover structure of any of the above embodiments.

[0021] Compared with the prior art, the present invention has at least the following advantages:

[0022] In the above-mentioned battery top cover structure, the outer peripheral wall of the sealing part is an inclined surface, the maximum cross-sectional area of ​​the sealing part is larger than the maximum cross-sectional area of ​​the lead-out part, one side of the sealing ring abuts against the sealing part and the welding part, and the other side of the sealing ring abuts against the top cover assembly, that is, the sealing ring is squeezed and sealed with the outer peripheral wall of the sealing part in the shape of an inclined surface in the vertical direction, and is squeezed and sealed with the welding part in the horizontal direction. Compared with the traditional cylindrical pole structure that only forms an extrusion seal in the vertical direction, the pole of the present application causes an extrusion seal on the sealing ring in both the vertical and horizontal directions, forming double airtight protection, with a simple structure and improved battery airtight performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present disclosure, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present disclosure and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0024] Figure 1 A schematic structural diagram of a battery top cover structure according to an embodiment;

[0025] Figure 2 for Figure 1 An exploded structural diagram of a battery top cover structure is shown;

[0026] Figure 3 for Figure 1 A schematic cross-sectional view of a battery top cover structure shown;

[0027] Figure 4 for Figure 3 The cross-sectional view shown is an enlarged schematic diagram at A;

[0028] Figure 5 for Figure 1 A schematic structural diagram of a pole of a battery top cover structure is shown. DETAILED DESCRIPTION

[0029] In order to facilitate the understanding of the present disclosure, the present disclosure will be described more fully below with reference to the relevant drawings. The preferred embodiments of the present disclosure are given in the drawings. However, the present disclosure can be implemented in many different forms and is not limited to the embodiments described herein. On the contrary, the purpose of providing these embodiments is to make the disclosure of the present disclosure more thoroughly and comprehensively understood.

[0030] It should be noted that when an element is referred to as being "fixed to" another element, it may be directly on the other element or there may be a central element. When an element is considered to be "connected to" another element, it may be directly connected to the other element or there may be a central element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are for illustrative purposes only and do not represent the only implementation method.

[0031] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as those commonly understood by those skilled in the art of the present disclosure. The terms used herein in the specification of the present disclosure are only for the purpose of describing specific embodiments and are not intended to limit the present disclosure. The term "and / or" used herein includes any and all combinations of one or more related listed items.

[0032] The present disclosure provides a battery top cover structure, including a pole, a pole pressure plate, a top cover assembly and a sealing ring, wherein the pole pressure plate is connected to the pole, the top cover assembly is provided with a pole hole, the sealing ring is arranged in the pole hole, the pole is passed through the pole hole, the pole includes a lead-out portion, a sealing portion and a welding portion, the lead-out portion is connected to the sealing portion, the welding portion is connected to the outer peripheral wall of the sealing portion, the outer peripheral wall of the sealing portion is an inclined surface, the maximum cross-sectional area of ​​the sealing portion is greater than the maximum cross-sectional area of ​​the lead-out portion, the sealing ring is sleeved on the outer peripheral wall of the sealing portion, one side of the sealing ring abuts against the sealing portion and the welding portion, and the other side of the sealing ring abuts against the top cover assembly.

[0033] In the above-mentioned battery top cover structure, the outer peripheral wall of the sealing part is an inclined surface, the maximum cross-sectional area of ​​the sealing part is larger than the maximum cross-sectional area of ​​the lead-out part, one side of the sealing ring abuts against the sealing part and the welding part, and the other side of the sealing ring abuts against the top cover assembly, that is, the sealing ring is squeezed and sealed with the outer peripheral wall of the sealing part in the shape of an inclined surface in the vertical direction, and is squeezed and sealed with the welding part in the horizontal direction. Compared with the traditional cylindrical pole structure that only forms an extrusion seal in the vertical direction, the pole of the present application causes an extrusion seal on the sealing ring in both the vertical and horizontal directions, forming double airtight protection, with a simple structure and improved battery airtight performance.

[0034] In order to better understand the technical solutions and beneficial effects of the present invention, the present invention is further described in detail below in conjunction with specific embodiments:

[0035] like Figures 1 to 5 As shown, a battery top cover structure 10 of an embodiment includes a pole 100, a pole pressure plate 200, a top cover assembly 300 and a sealing ring 400, wherein the pole pressure plate 20 is connected to the pole 100, the top cover assembly 300 is provided with a pole hole 301, the sealing ring 400 is arranged in the pole hole 301, the pole 100 is passed through the pole hole 301, the pole 100 includes a lead-out portion 110, a sealing portion 120 and a welding portion 130, the lead-out portion 110 and the The sealing part 120 is connected, the welding part 130 is connected to the outer peripheral wall of the sealing part 120, the outer peripheral wall of the sealing part 120 is an inclined surface, the maximum cross-sectional area of ​​the sealing part 120 is greater than the maximum cross-sectional area of ​​the lead-out part 110, the sealing ring 400 is sleeved on the outer peripheral wall of the sealing part 120, one side of the sealing ring 400 abuts against the sealing part 120 and the welding part 130, and the other side of the sealing ring 400 abuts against the top cover assembly 300.

[0036] In this embodiment, the pole 100 includes a lead-out portion 110, a sealing portion 120 and a welding portion 130. The lead-out portion 110 is connected to the sealing portion 120, and the welding portion 130 is connected to the outer peripheral wall of the sealing portion 120. The outer peripheral wall of the sealing portion 120 is an inclined surface, and the maximum cross-sectional area of ​​the sealing portion 120 is greater than the maximum cross-sectional area of ​​the lead-out portion 110. It can be understood that the pole 100 of the present application is different from the traditional cylindrical pole. The pole 100 is divided into a lead-out portion 110 with a smaller cross-sectional area and a sealing portion 120 with a larger cross-sectional area, and the outer peripheral wall of the sealing portion 120 is designed to be inclined. When the sealing ring 400 abuts against the pole 100, it is squeezed and sealed with the outer peripheral wall of the sealing portion 120 in a sloped shape in the vertical direction, and squeezed and sealed with the welding portion 130 in the horizontal direction, forming double airtight protection for the pole 100.

[0037] In the above-mentioned battery top cover structure 10, the outer peripheral wall of the sealing part 120 is an inclined surface, and the maximum cross-sectional area of ​​the sealing part 120 is greater than the maximum cross-sectional area of ​​the lead-out part 110. One side of the sealing ring 400 abuts against the sealing part 120 and the welding part 130, and the other side of the sealing ring 400 abuts against the top cover assembly 300, that is, the sealing ring 400 is squeezed and sealed with the outer peripheral wall of the sealing part 120 in the shape of an inclined surface in the vertical direction, and is squeezed and sealed with the welding part 130 in the horizontal direction. Compared with the traditional cylindrical pole 100 that only forms an extrusion seal in the vertical direction, the pole 100 of the present application causes an extrusion seal on the sealing ring 400 in both the vertical direction and the horizontal direction, forming double airtight protection, with a simple structure and improved battery airtight performance.

[0038] like Figures 3 to 5 As shown, in one embodiment, the lead-out portion 110, the sealing portion 120 and the welding portion 130 are integrally formed. In this embodiment, the lead-out portion 110, the sealing portion 120 and the welding portion 130 are integrally formed, which improves the overall structural strength of the pole 100.

[0039] like Figures 3 to 5 As shown, in one embodiment, the sealing portion 120 is respectively welded to the lead-out portion 110 and the welding portion 130. In this embodiment, the sealing portion 120 is respectively welded to the lead-out portion 110 and the welding portion 130 to ensure the normal use of the pole 100.

[0040] like Figure 5 As shown, in one embodiment, the lead-out portion 110 is cylindrical, the sealing portion 120 is truncated, and the welding portion 130 is annular. In this embodiment, the cross-sectional area of ​​the lead-out portion 110 is equal to the minimum cross-sectional area of ​​the sealing portion 120, so that the pole 100 presents a structure that is small on the top and large on the bottom, and the outer peripheral wall of the sealing portion 120 is arranged in an inclined surface, so that when the pole 100 and the sealing ring 400 are squeezed and matched, the sealing ring 400 can form a compression amount in the horizontal and vertical directions respectively, thereby improving the double airtight protection. It can be understood that this embodiment is the best embodiment. In other embodiments, the cross-sections of the lead-out portion 110 and the sealing portion 120 can also be square, rectangular or other shapes, and the welding portion 130 can also be correspondingly in other shapes such as a long ring shape.

[0041] like Figure 5 As shown, in one embodiment, the inclined angle of the bevel of the outer peripheral wall of the sealing portion 120 is 15° to 45°. In this embodiment, the inclined angle of the bevel of the outer peripheral wall of the sealing portion 120 is between 15° and 45°. It can be understood that when the sealing ring 400 abuts against the sealing portion 120, if the bevel angle is too small, the compression amount of the sealing ring 400 in the vertical direction is too small, which is not conducive to the extrusion sealing effect of the sealing ring 400 in the vertical direction. If the bevel angle is too large, on the one hand, the volume of the sealing portion 120 of the pole 100 becomes larger, which is not conducive to the assembly and welding of the pole 100. On the other hand, the compression amount of the sealing ring 400 in the vertical direction is too large, which is not conducive to the extrusion sealing of the sealing ring 400 and affects the sealing performance of the battery.

[0042] like Figures 3 to 5As shown, in one embodiment, the battery top cover structure 10 further includes a connecting piece 500, and the connecting piece 500 is welded to the sealing part 120 and the welding part 130 respectively. In this embodiment, the connecting piece 500 and the sealing part 120 are spliced ​​and spot welded, and the connecting piece 500 and the welding part 130 are laser welded. The welding form of the pole 100 and the connecting piece 500 is splicing welding and laser welding. The connecting piece 500 and the sealing part 120 are spliced ​​and spot welded, and the connecting piece 500 and the welding part 130 are laser welded, which replaces the traditional laser penetration welding of the connecting piece 500 and the pole 100, avoiding the poor welding effect caused by blind welding.

[0043] like Figures 2 to 4 As shown, in one embodiment, the top cover assembly 300 includes a cover plate 320, an upper plastic 310 and a lower plastic 330, the pole hole 301 includes a first through hole 3001, a second through hole 3002 and a third through hole 3003 that are connected in sequence, the first through hole 3001 is opened in the upper plastic 310, the second through hole 3002 is opened in the cover plate 320, and the third through hole 3003 is opened in the lower plastic 330, and the pole 100 is sequentially penetrated through the first through hole 3001, the second through hole 3002 and the third through hole Hole 3003; the upper plastic 310 is partially located in the second through hole 3002, and the upper plastic 310 protrudes from one side of the cover plate 320, the upper plastic 310 is provided with a limiting groove 3101, the pole pressure plate 200 is located in the limiting groove 3101, the sealing ring 400 is partially located in the second through hole 3002, the lower plastic 330 is located on the other side of the cover plate 320, the sealing ring 400 extends to the third through hole 3003, and the upper plastic 310, the cover plate 320 and the lower plastic 330 are all in contact with the sealing ring 400. In this embodiment, the top cover assembly 300 includes an upper plastic 310, a cover plate 320 and a lower plastic 330. It can be understood that the shapes of the first through hole 3001, the second through hole 3002 and the third through hole 3003 are adapted to the shape of the pole 100. The pole 100 is sequentially penetrated through the first through hole 3001, the second through hole 3002 and the third through hole 3003 to ensure the connection between the pole 100 and the connecting piece 500. The upper plastic 310, the cover plate 320 and the lower plastic 330 are necessary components of the battery to ensure the normal assembly and use of the battery.

[0044] like Figures 2 to 4 As shown, in one embodiment, the pole 100 is welded to the pole pressing plate 200. In this embodiment, the pole 100 is fixed by welding the pole pressing plate 200, so that the two ends of the pole 100 are respectively fixedly welded to the pole pressing plate 200 and the connecting piece 500, ensuring the normal assembly and use of the battery.

[0045] like Figure 1 and Figure 2As shown, in one embodiment, the battery top cover structure 10 further includes an explosion-proof valve 600, an explosion-proof hole 302 is opened at the center of the cover plate 320, and the explosion-proof valve 600 is located in the explosion-proof hole 302. In this embodiment, the explosion-proof valve 600 and the explosion-proof hole 302 are used for high-temperature and high-pressure gas to push open the explosion-proof valve 600 and discharge from the explosion-proof hole 302 when thermal runaway occurs in the battery, thereby preventing the battery from exploding due to the failure of high-temperature and high-pressure gas to be discharged in time, thereby improving the safety performance of the battery.

[0046] The present application also provides a square battery, comprising the battery top cover structure 10 of any of the above embodiments.

[0047] Compared with the prior art, the present invention has at least the following advantages:

[0048] 1. In the above-mentioned battery top cover structure 10, the outer peripheral wall of the sealing part 120 is an inclined surface, and the maximum cross-sectional area of ​​the sealing part 120 is greater than the maximum cross-sectional area of ​​the lead-out part 110. One side of the sealing ring 400 abuts against the sealing part 120 and the welding part 130, and the other side of the sealing ring 400 abuts against the top cover assembly 300, that is, the sealing ring 400 is squeezed and sealed with the outer peripheral wall of the sealing part 120 in the shape of an inclined surface in the vertical direction, and is squeezed and sealed with the welding part 130 in the horizontal direction. Compared with the traditional cylindrical pole 100 that only forms an extrusion seal in the vertical direction, the pole 100 of the present application causes an extrusion seal on the sealing ring 400 in both the vertical and horizontal directions, forming double airtight protection, with a simple structure and improved battery airtightness.

[0049] 2. The welding portion 130 is connected to the outer wall of the sealing portion 120, and the connecting piece 500 is welded to the sealing portion 120 and the welding portion 130 respectively, that is, the pole 100 is respectively spliced ​​with the positive and negative connecting pieces 520 of the battery for laser welding, while the conventional laser penetration welding of the connecting piece 500 and the pole 100 is blind welding. This type of welding method cannot identify the welding trajectory and is prone to welding errors, thereby reducing the battery yield. In the present application, the pole 100 and the connecting piece 500 are spliced ​​and then welded to identify the welding trajectory, making the welding visual and reliable, thereby improving the battery yield.

[0050] The above-mentioned embodiments only express several implementation methods of the present disclosure, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present disclosure, and these all belong to the protection scope of the present disclosure. Therefore, the protection scope of the patent of the present disclosure shall be based on the attached claims.

Claims

1. A battery top cover structure, comprising a pole, a pole pressure plate, a top cover assembly and a sealing ring, wherein the pole pressure plate is connected to the pole, the top cover assembly is provided with a pole hole, the sealing ring is arranged in the pole hole, and the pole is passed through the pole hole, characterized in that: The pole includes a lead-out portion, a sealing portion and a welding portion, the lead-out portion is connected to the sealing portion, the welding portion is connected to the outer peripheral wall of the sealing portion, the outer peripheral wall of the sealing portion is an inclined surface, the maximum cross-sectional area of ​​the sealing portion is greater than the maximum cross-sectional area of ​​the lead-out portion, the sealing ring is sleeved on the outer peripheral wall of the sealing portion, one side of the sealing ring abuts against the sealing portion and the welding portion, and the other side of the sealing ring abuts against the top cover assembly.

2. The battery top cover structure according to claim 1, characterized in that: The lead-out portion, the sealing portion and the welding portion are an integrally formed structure.

3. The battery top cover structure according to claim 1, characterized in that: The sealing portion is welded to the lead-out portion and the welding portion, respectively.

4. The battery top cover structure according to claim 1, characterized in that: The lead-out portion is cylindrical in shape; and / or, The sealing portion is in the shape of a truncated cone; and / or, The welding portion is in the shape of a circular ring.

5. The battery top cover structure according to claim 1, characterized in that: The inclined surface of the outer peripheral wall of the sealing portion has an inclination angle of 15° to 45°.

6. The battery top cover structure according to claim 1, characterized in that: The battery top cover structure also includes a connecting piece, and the connecting piece is welded to the sealing part and the welding part respectively.

7. The battery top cover structure according to claim 1, characterized in that: The top cover assembly includes a cover plate, an upper plastic and a lower plastic, the pole hole includes a first through hole, a second through hole and a third through hole that are connected in sequence, the first through hole is opened in the upper plastic, the second through hole is opened in the cover plate, the third through hole is opened in the lower plastic, and the pole is sequentially penetrated through the first through hole, the second through hole and the third through hole; The upper plastic portion is located in the second through hole, and the upper plastic protrudes from one side of the cover plate. The upper plastic is provided with a limiting groove, and the pole pressure plate is located in the limiting groove. The sealing ring portion is located in the second through hole, and the lower plastic is located on the other side of the cover plate. The sealing ring extends into the third through hole, and the upper plastic, the cover plate and the lower plastic are all in contact with the sealing ring.

8. The battery top cover structure according to claim 7, characterized in that: The pole is welded to the pole pressure plate.

9. The battery top cover structure according to claim 7, characterized in that: The battery top cover structure also includes an explosion-proof valve. An explosion-proof hole is opened at the center of the cover plate, and the explosion-proof valve is located in the explosion-proof hole.

10. A square battery, characterized in that: A battery top cover structure comprising the battery top cover structure described in any one of claims 1 to 9.

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