CN216773370U - Battery top cap subassembly and lithium ion battery - Google Patents
Battery top cap subassembly and lithium ion battery Download PDFInfo
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- CN216773370U CN216773370U CN202123358791.XU CN202123358791U CN216773370U CN 216773370 U CN216773370 U CN 216773370U CN 202123358791 U CN202123358791 U CN 202123358791U CN 216773370 U CN216773370 U CN 216773370U
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Abstract
The utility model relates to the technical field of power batteries, in particular to a battery top cover assembly and a lithium ion battery. The battery top cover assembly provided by the utility model comprises a top cover plate, an explosion-proof sheet and a protection patch, wherein the top cover plate is outwards convexly provided with an explosion-proof boss, the upper surface of the explosion-proof boss is provided with a patch mounting groove, the lower surface of the explosion-proof boss is provided with an explosion-proof sheet mounting groove, the explosion-proof boss is provided with a pressure relief hole penetrating through the patch mounting groove and the explosion-proof sheet mounting groove, the explosion-proof sheet is fixed in the explosion-proof sheet mounting groove and seals the pressure relief hole, and the protection patch is fixed in the patch mounting groove and covers the pressure relief hole. Through fixing the explosion-proof piece in the explosion-proof piece mounting groove to fixing the protection paster in the paster mounting groove, strengthened the structural strength of explosion-proof boss, the explosion-proof piece is difficult for taking place to warp when the installation, and the processing degree of difficulty has been reduced to the lamina tecti. The lithium ion battery improves the structural strength of the top cover plate and reduces the processing difficulty by applying the battery top cover assembly.
Description
Technical Field
The utility model relates to the technical field of power batteries, in particular to a battery top cover assembly and a lithium ion battery.
Background
Lithium ion batteries have the advantages of high energy density, small self-discharge, long cycle life, and the like, and are currently widely applied to the fields of electronic products, power electric vehicles, energy storage, and the like. Because a large amount of chemical substances are filled in the lithium ion battery, the battery can generate gas in the charging and discharging use process, so that the pressure is continuously accumulated in the battery, and if the pressure is not released after a certain pressure is reached, the battery explosion can be caused to cause serious consequences. In order to prevent the explosion of the battery, a safety device for releasing pressure is generally provided on a cap plate of the battery.
At present, the safety device of common pressure release sets up the pressure release hole on the lamina tecti of battery, then fixes the explosion-proof piece on the lamina tecti and comes the shutoff pressure release hole, guarantees the gas tightness of battery, after the inside pressure of battery reaches the certain degree, can explode the explosion-proof piece to make the inside pressure of battery obtain the release through the pressure release hole, avoid the battery to explode. But the battery lamina tecti's intensity is relatively poor, and easy the deformation is difficult for fixing explosion-proof piece on the lamina tecti, has increased the processing degree of difficulty.
Therefore, it is desirable to provide a top cap assembly and a lithium ion battery to solve the above problems.
SUMMERY OF THE UTILITY MODEL
An object of the present invention is to provide a battery top cap assembly to prevent a top cap plate from being deformed when an explosion-proof sheet is fixed, to improve the structural strength of the top cap plate, and to reduce the processing difficulty.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a battery top cap assembly, comprising:
the anti-explosion cover comprises a top cover plate, a bottom cover plate and a bottom cover plate, wherein the top cover plate is provided with an anti-explosion boss in an outward protruding mode, the upper surface of the anti-explosion boss is provided with a patch mounting groove, the lower surface of the anti-explosion boss is provided with an anti-explosion piece mounting groove, and the anti-explosion boss is provided with a pressure relief hole penetrating through the patch mounting groove and the anti-explosion piece mounting groove;
the explosion-proof piece is fixed in the explosion-proof piece mounting groove and seals the pressure relief hole; and
and the protective patch is fixed in the patch mounting groove and covers the pressure relief hole.
As a preferred scheme, a containing cavity is formed between the explosion-proof sheet and the protection patch, the lower surface of the protection patch is divided into a gluing area and a glue-free area, a glue layer is coated on the gluing area, the gluing area is pasted in the patch mounting groove through the glue layer, and the glue-free area enables the containing cavity to be communicated with the outside.
Preferably, the thickness of the adhesive layer is 0.1 mm-0.5 mm.
Preferably, the glue coating areas are symmetrically arranged at two ends of the glue-free area.
Preferably, the protective patch is made of a transparent substrate.
As a preferred scheme, the middle of the explosion-proof boss is circular, and two symmetrical ends of the explosion-proof boss are connected and transited with the circular shape in a square mode.
Preferably, the explosion-proof sheet is provided with an explosion-proof score, the explosion-proof score divides the explosion-proof sheet into a first area and a second area, the first area surrounds the periphery of the second area, and the second area is opposite to the pressure relief hole.
Preferably, the second region is raised upwardly relative to the first region.
Preferably, the first area is welded and fixed in the explosion-proof sheet mounting groove.
Another objective of the present invention is to provide a lithium ion battery to prevent deformation of the top cover plate when the explosion-proof sheet is fixed, improve the structural strength of the top cover plate, and reduce the processing difficulty of the battery top cover plate assembly.
In order to achieve the purpose, the utility model adopts the following technical scheme:
a lithium ion battery comprises a battery shell with an opening and a battery core positioned in the battery shell, and further comprises the battery top cover assembly, wherein the top cover plate is plugged on the opening of the battery shell.
The utility model has the beneficial effects that:
the utility model provides a battery top cover assembly, wherein an explosion-proof boss is formed by outwards protruding a top cover plate, an explosion-proof piece mounting groove is formed in the lower surface of the explosion-proof boss to fix an explosion-proof piece to seal a pressure relief hole, the structural strength of the explosion-proof boss is enhanced, when the explosion-proof piece is fixed in the explosion-proof piece mounting groove, the top cover plate is not easy to deform, and the processing difficulty is reduced. In addition, a patch mounting groove is formed in the upper surface of the explosion-proof boss to place a protection patch to protect the explosion-proof piece, so that the structural strength of the explosion-proof boss and the whole top cover plate is further enhanced.
The utility model also provides a lithium ion battery, and by applying the battery top cover assembly, the structural strength of the top cover plate is enhanced, and when the explosion-proof sheet is fixed in the explosion-proof sheet mounting groove, the explosion-proof sheet is not easy to deform, and the processing difficulty is reduced. In addition, the structural strength of the top cover plate is enhanced by the mounting mode of the protection patch.
Drawings
Fig. 1 is an exploded view of a battery top cap assembly provided by an embodiment of the present invention;
FIG. 2 is an enlarged view of a portion of FIG. 1 at A;
FIG. 3 is a schematic structural diagram of a top cover plate according to an embodiment of the present invention;
FIG. 4 is a cross-sectional view of an explosion-proof boss provided with an explosion-proof sheet and a protection patch according to an embodiment of the utility model;
fig. 5 is a schematic structural diagram of a protection patch according to an embodiment of the present invention.
In the figure:
1. a top cover plate; 11. an explosion-proof boss; 111. mounting grooves for mounting the patch; 112. an explosion-proof sheet mounting groove; 113. a pressure relief vent;
2. an explosion-proof sheet; 21. explosion-proof nicking; 22. a first region; 23. a second region;
3. a protective patch; 31. a gluing area; 32. a glue-free area.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
In the description of the present embodiment, the terms "upper", "lower", "left", "right", and the like are used based on the orientations and positional relationships shown in the drawings only for convenience of description and simplification of operation, and do not indicate or imply that the referred device or element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.
The embodiment provides a lithium ion battery, which comprises a battery shell, an electric core and a battery top cover assembly, wherein the battery shell is provided with an opening, the electric core is positioned inside the battery shell, and the battery top cover assembly is blocked on the opening of the battery shell, so that the battery shell is sealed.
Because a large amount of chemical substances are arranged in the battery core, the lithium ion battery can generate gas in the charging and discharging process, so that pressure is continuously accumulated in the battery shell, and the explosion of the lithium ion battery can be caused if the pressure is not released after a certain pressure is reached, thereby causing serious consequences.
In order to prevent the lithium ion battery from exploding, as shown in fig. 1, the embodiment provides a battery top cap assembly, which includes a top cap plate 1 and an explosion-proof sheet 2, wherein the top cap plate 1 is sealed on an opening of the battery case, a pressure relief hole 113 is formed in the top cap plate 1, and the explosion-proof sheet 2 is fixed on the top cap plate 1 and seals the pressure relief hole 113. When lithium ion battery is in normal operating condition, explosion-proof piece 2 can realize guaranteeing lithium ion battery's gas tightness to pressure release hole 113, and when the inside pressure of battery case exceeded rated safe numerical value, explosion-proof piece 2 can be by the inside gaseous blasting of battery case for the inside pressure of battery case obtains the release through pressure release hole 113, avoids lithium ion battery to explode, improves lithium ion battery's security.
During the production of lithium ions, the surface of the explosion-proof plate 2 is often contaminated by electrolyte or other foreign matters, and during the production and processing, the explosion-proof plate 2 may be touched by misoperation, so that scratches or even cracks are generated on the explosion-proof plate 2. In order to improve the protection to explosion-proof piece 2, as shown in fig. 1, the battery top cover assembly provided by the embodiment further comprises a protection patch 3, wherein the protection patch 3 is arranged on the top cover plate 1, and the cover is arranged above the explosion-proof piece 2 and the pressure relief hole 113, so that the protection to the explosion-proof piece 2 is improved.
Because the thickness of lamina tecti 1 is thinner, and intensity is relatively poor and take place to warp easily, is difficult for welded fastening explosion-proof piece 2 on lamina tecti 1, has increased the processing degree of difficulty. In order to strengthen the structural strength of the top cover plate 1, as shown in fig. 2 to 4, the top cover plate 1 is formed with an explosion-proof boss 11 by outwards protruding, a patch mounting groove 111 is provided on the upper surface of the explosion-proof boss 11, an explosion-proof sheet mounting groove 112 is provided on the lower surface of the explosion-proof boss 11, and a pressure relief hole 113 is provided on the explosion-proof boss 11, the pressure relief hole 113 runs through the patch mounting groove 111 and the explosion-proof sheet mounting groove 112, the explosion-proof sheet 2 is fixed in the explosion-proof sheet mounting groove 112 and blocks the pressure relief hole 113, the protection patch 3 is fixed in the patch mounting groove 111, so that the protection patch 3 covers the explosion-proof sheet 2 and the pressure relief hole 113. This embodiment is through establishing the explosion-proof boss 11 of formation with the top deck 1 to the evagination to set up explosion-proof piece mounting groove 112 fixed explosion-proof piece 2 at the lower surface of explosion-proof boss 11 and remove sealed pressure release hole 113, the structural strength of explosion-proof boss 11 has been strengthened, when explosion-proof piece 2 is fixed in explosion-proof piece mounting groove 112, explosion-proof piece mounting groove 112 and whole top deck 1 are difficult for taking place to warp, be convenient for realize the installation to explosion-proof piece 2, the processing degree of difficulty has been reduced. In addition, the patch mounting groove 111 is formed in the upper surface of the explosion-proof boss 11 to place the protection patch 3, so that the structural strength of the explosion-proof boss 11 and the whole top cover plate 1 is further enhanced.
In this embodiment, as shown in fig. 2, the middle of the explosion-proof boss 11 is circular, and two symmetrical ends of the explosion-proof boss 11 are connected and transitioned in a square and circular manner, and a pressure relief hole 113 is formed in the circular portion of the explosion-proof boss 11. This shape can further enhance the structural strength of the explosion-proof boss 11. The explosion-proof boss 11 may also be designed in a racetrack shape, an oval shape or other shapes, and correspondingly, the patch mounting groove 111 is adapted to the shape of the explosion-proof boss 11, and the shape of the explosion-proof sheet mounting groove 112 is adapted to the shape of the pressure relief hole 113.
Referring to fig. 1 and 4, the structure of the rupture disk 2 is described, and as shown in fig. 1 and 4, the rupture disk 2 is provided with an explosion-proof score 21, the explosion-proof score 21 divides the rupture disk 2 into a first area 22 and a second area 23, the first area 22 is arranged around the periphery of the second area 23, and the second area 23 faces the pressure relief hole 113. Through setting up explosion-proof nick 21 on explosion-proof piece 2, when the inside pressure of battery case exceeded rated safety numerical value, explosion-proof piece 2 can explode in explosion-proof nick 21 department, and the inside gas of the battery case of being convenient for improves explosion effect of explosion-proof piece 2 through looping through second region 23 and pressure release hole 113 discharge. In the present embodiment, the first region 22 is welded and fixed in the rupture disk mounting groove 112, and the periphery of the rupture disk 2 can be welded and fixed in the rupture disk mounting groove 112, so as to improve the fixing stability of the rupture disk 2 and the sealing effect on the pressure relief hole 113.
Further, as shown in fig. 4, the second region 23 is upwardly convex with respect to the first region 22, and when the pressure inside the battery case exceeds the rated safety value, the gas inside more easily impacts the second region 23 upwardly so as to detach the second region 23 from the first region 22 at the explosion-proof score 21, thereby realizing explosion.
As shown in fig. 4, after fixing the protection paster 3 in paster mounting groove 111, form between explosion-proof piece 2 and the protection paster 3 and hold the cavity, in order to be able to carry out the gas tightness to lithium ion battery and detect, carry out better quality control to explosion-proof piece 2, set up the intercommunication mechanism with external intercommunication on holding the cavity usually to it is qualified whether the accurate sealed effect that detects explosion-proof piece 2 to pressure release hole 113 avoids taking place the possibility of gas tightness detection mistake. But the structure of the communication mechanism is complex, and the processing cost is increased.
In order to solve the above problem, as shown in fig. 5, the lower surface of the protection patch 3 provided in this embodiment is divided into a glue applying area 31 and a glue-free area 32, the glue applying area 31 is coated with a glue layer, the glue applying area 31 is adhered in the patch mounting groove 111 through the glue layer, and the glue layer has a certain thickness, so that a certain gap exists between the glue-free area 32 and the patch mounting groove 111, and the glue-free area 32 can communicate the accommodating cavity with the outside, and a communication mechanism is not required to be additionally arranged on the accommodating cavity, thereby simplifying the structure and reducing the cost. In this embodiment, the protection patch 3 can be made of a transparent substrate, which is more convenient for observing the state of the explosion-proof sheet 2.
Preferably, the thickness of the glue layer is 0.1mm to 0.5mm, which can ensure that a required gap exists between the glue-free area 32 and the patch mounting groove 111, and can also ensure that the glue-coated area 31 is stuck and fixed on the patch mounting groove 111.
In order to ensure that the protection patch 3 can be more firmly adhered to the patch mounting groove 111, as shown in fig. 5, the gluing areas 31 are symmetrically arranged at two ends of the non-gluing area 32, two ends of the protection patch 3 can be stably fixed to the patch mounting groove 111, the protection patch 3 is firmly fixed, and the non-gluing area 32 can be ensured to enable the accommodating cavity to be communicated with the outside. It should be noted that the protection patch 3 is adapted to the shape of the explosion-proof boss 11 in this embodiment, that is, the area of the protection patch 3 opposite to the circular portion of the explosion-proof boss 11 is the glue-free area 32, and the area of the protection patch 3 opposite to the square portion of the explosion-proof boss 11 is the glue-coated area 31. In other embodiments, the two glue applying areas 31 may also be asymmetrically arranged, and the glue applying area 31 of the protection patch 3 may also be designed into a semicircular shape, a U shape or a V shape, and accordingly, the shape of the explosion-proof boss 11 is also correspondingly changed.
The lithium ion battery that this embodiment provided, through using above-mentioned battery top cap subassembly, strengthened the structural strength of lamina tecti 1, when explosion-proof piece 2 is fixed in explosion-proof piece mounting groove 112, difficult emergence is out of shape, has reduced the processing degree of difficulty. In addition, the structural strength of the top cover plate 1 is enhanced by the mounting mode of the protection patch 3, and the protection of the explosion-proof sheet 2 is also improved by the protection patch 3.
It should be understood that the above-described embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle of the present invention should be included in the protection scope of the claims of the present invention.
Claims (10)
1. A battery top cap assembly, comprising:
the anti-explosion cover comprises a top cover plate (1), wherein an anti-explosion boss (11) is convexly arranged on the top cover plate (1), a patch mounting groove (111) is formed in the upper surface of the anti-explosion boss (11), an anti-explosion sheet mounting groove (112) is formed in the lower surface of the anti-explosion boss (11), and a pressure relief hole (113) penetrating through the patch mounting groove (111) and the anti-explosion sheet mounting groove (112) is formed in the anti-explosion boss (11);
an explosion-proof plate (2) fixed in the explosion-proof plate mounting groove (112) and sealing the pressure relief hole (113); and
and the protective patch (3) is fixed in the patch mounting groove (111) and covers the pressure relief hole (113).
2. The battery top cover assembly according to claim 1, wherein a containing cavity is formed between the explosion-proof sheet (2) and the protection patch (3), the lower surface of the protection patch (3) is divided into a glue coating area (31) and a glue-free area (32), a glue layer is coated on the glue coating area (31), the glue coating area (31) is adhered in the patch installation groove (111) through the glue layer, and the glue-free area (32) enables the containing cavity to be communicated with the outside.
3. The battery top cap assembly of claim 2, wherein the adhesive layer has a thickness of 0.1mm to 0.5 mm.
4. The battery top cap assembly of claim 2, wherein the glue area (31) is symmetrically disposed at both ends of the glue-free area (32).
5. The battery top cover assembly according to any one of claims 1 to 4, wherein the protective patch (3) is made of a transparent substrate.
6. The battery top cover assembly according to any one of claims 1-4, wherein the middle of the explosion-proof boss (11) is circular, and two symmetrical ends of the explosion-proof boss (11) are in square connection transition with the circular shape.
7. The battery top cover assembly according to any one of claims 1 to 4, wherein an explosion-proof score (21) is arranged on the explosion-proof sheet (2), the explosion-proof score (21) divides the explosion-proof sheet (2) into a first area (22) and a second area (23), the first area (22) is arranged around the periphery of the second area (23), and the second area (23) is opposite to the pressure relief hole (113).
8. The battery top cap assembly of claim 7, wherein the second region (23) is raised upwardly relative to the first region (22).
9. The battery top cap assembly of claim 7, wherein the first region (22) is welded and secured in the rupture disc mounting groove (112).
10. A lithium ion battery comprising a battery case having an opening and a battery core located inside the battery case, wherein the lithium ion battery further comprises the battery top cover assembly according to any one of claims 1 to 9, and the top cover plate (1) is sealed on the opening of the battery case.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123358791.XU CN216773370U (en) | 2021-12-29 | 2021-12-29 | Battery top cap subassembly and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123358791.XU CN216773370U (en) | 2021-12-29 | 2021-12-29 | Battery top cap subassembly and lithium ion battery |
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| Publication Number | Publication Date |
|---|---|
| CN216773370U true CN216773370U (en) | 2022-06-17 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202123358791.XU Active CN216773370U (en) | 2021-12-29 | 2021-12-29 | Battery top cap subassembly and lithium ion battery |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024082096A1 (en) * | 2022-10-17 | 2024-04-25 | 宁德时代新能源科技股份有限公司 | Battery cell, battery, energy storage apparatus, and electrical apparatus |
-
2021
- 2021-12-29 CN CN202123358791.XU patent/CN216773370U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024082096A1 (en) * | 2022-10-17 | 2024-04-25 | 宁德时代新能源科技股份有限公司 | Battery cell, battery, energy storage apparatus, and electrical apparatus |
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