CN219979744U - Lithium battery top cover and lithium battery - Google Patents
Lithium battery top cover and lithium battery Download PDFInfo
- Publication number
- CN219979744U CN219979744U CN202321507041.0U CN202321507041U CN219979744U CN 219979744 U CN219979744 U CN 219979744U CN 202321507041 U CN202321507041 U CN 202321507041U CN 219979744 U CN219979744 U CN 219979744U
- Authority
- CN
- China
- Prior art keywords
- lithium battery
- window
- patch
- top cover
- battery top
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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Links
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 30
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 30
- 238000007789 sealing Methods 0.000 claims description 22
- 239000000243 solution Substances 0.000 description 4
- 239000003792 electrolyte Substances 0.000 description 3
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 239000007788 liquid Substances 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000015572 biosynthetic process Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 230000005489 elastic deformation Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
Landscapes
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The utility model provides a lithium battery top cover and a lithium battery, comprising a cover body, wherein a window is formed in the cover body; the patch assembly is arranged in the window and seals the window; the patch assembly comprises at least two patch units, at least one patch unit is lapped on the other patch unit, the two patch units which are lapped are tightly sealed to form a lapped part, and each patch unit can be pressed to elastically deform and can elastically reset; the patch assembly is formed by overlapping the overlapping parts of the two patch units to seal the window of the explosion-proof valve, the patch assembly can deform elastically, so that when the air pressure in a gap between the patch assembly and the explosion-proof valve changes along with the temperature, the patch assembly can be extruded to deform and exhaust air, and the air pressure in the gap is restored to be balanced, and then the patch assembly is elastically reset.
Description
Technical Field
The utility model relates to the technical field of power batteries, in particular to a lithium battery top cover and a lithium battery.
Background
In existing power cells, there are two designs of explosion-proof valve patches, one without an opening and one with an opening. The design of the opening can lead to the occurrence that electrolyte enters the explosion-proof valve plate through the explosion-proof valve patch in the process of liquid injection and formation, so that pollution and corrosion are caused; and the design without an opening can lead to the fact that the air pressure between the patch and the explosion-proof valve of the battery is too high under the high-temperature environment, so that the patch can bulge and deform.
Chinese patent CN217009356U discloses a battery and a battery pack, in which a cut mark or a cut-off is punched on an explosion-proof valve patch on a top cover, so that the explosion-proof valve patch still has good tightness, thereby solving the problem that electrolyte enters the explosion-proof valve plate through the explosion-proof valve patch. However, the above design still does not solve the problem that the air pressure between the patch and the explosion-proof valve of the battery is too high in a high-temperature environment, so that the patch bulges and deforms.
Disclosure of Invention
In view of the above, the utility model provides a lithium battery top cover and a lithium battery, which are used for solving the problem that the patch bulges and deforms due to overlarge air pressure between the patch and an explosion-proof valve under a high-temperature environment of the battery.
The technical scheme of the utility model is realized as follows: the utility model provides a lithium battery top cover, which comprises a cover body, wherein a window is formed in the cover body; the patch assembly is arranged in the window and seals the window; the patch assembly comprises at least two patch units, at least one patch unit is lapped on the other patch unit, the two patch units which are lapped are tightly sealed to form a lapped part, and each patch unit can be pressed to elastically deform and elastically reset.
On the basis of the above technical solution, preferably, the sum of the radial cross-sectional areas of the respective sheet units is larger than the radial cross-sectional area of the window.
Still more preferably, each of the tab units has a radial cross-sectional area smaller than a radial cross-sectional area of the window.
Still more preferably, at least two of the tablet units are identical in shape and radial cross-sectional area.
On the basis of the technical scheme, the radial section shape of the lap joint part is preferably trapezoid or parallelogram.
On the basis of the above technical solution, preferably, the portion of each sheet unit located at the overlap portion is a sealing portion, and the cross-sectional shape of the sealing portion along the extending direction of the sheet unit is triangular or trapezoidal.
On the basis of the above technical scheme, preferably, the part of each piece unit located at the lap joint part is a sealing part, a step is formed on the sealing part, and the steps of the two sealing parts are matched with each other.
Still more preferably, the end surfaces of the two sheet units overlapped by the sealing portion are flush.
On the basis of the technical scheme, preferably, a flange is axially arranged on the inner wall of the window around the window, and the flange is lapped on the outer contour edge of the patch assembly.
On the other hand, the utility model also provides a lithium battery, and the lithium battery top cover is adopted.
Compared with the prior art, the lithium battery top cover and the lithium battery have the following beneficial effects:
(1) According to the utility model, the patch assembly is formed by overlapping the overlapping parts of the two patch units to seal the explosion-proof valve window, the patch assembly can elastically deform, so that when the air pressure in the gap between the patch assembly and the explosion-proof valve changes along with the temperature, the patch assembly can be extruded to deform and exhaust the air, and the patch assembly elastically resets after the air pressure in the gap is restored to be balanced.
(2) The sealing parts of the lap joint parts of the two sheet units are designed to realize sealing through step fit or close fit, so that the sealing performance of the patch assembly is greatly improved, the gap between the patch assembly and the explosion-proof valve is ensured not to leak air, the strength of the patch assembly is enhanced, and the patch assembly is prevented from being reset after being deformed due to overlarge compression.
Drawings
In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, it being obvious that the drawings in the following description are only some embodiments of the utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a perspective view of a lithium battery top cap of the present utility model;
FIG. 2 is a top view of the lap joint of the present utility model;
FIG. 3 is a top view of another embodiment of a lap joint of the present utility model;
FIG. 4 is a top view of yet another embodiment of a lap joint of the present utility model;
FIG. 5 is a side cross-sectional view of the lap joint of the present utility model;
FIG. 6 is a side cross-sectional view of another embodiment of a lap joint of the present utility model;
fig. 7 is a side cross-sectional view of yet another embodiment of a lap joint of the present utility model.
In the figure: 1. a cover body; 11. a flange; 101. a window; 2. a patch assembly; 21. a sheet unit; 211. a sealing part; 201. and a lap joint part.
Detailed Description
The following description of the embodiments of the present utility model will clearly and fully describe the technical aspects of the embodiments of the present utility model, and it is apparent that the described embodiments are only some embodiments of the present utility model, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present utility model without making any inventive effort, are intended to fall within the scope of the present utility model.
Example 1
As shown in fig. 1, referring to fig. 2 and 5, the top cover of a lithium battery of the present utility model includes a cover body 1 and a patch assembly 2.
The cover body 1 may be a top cover of a square battery or a top cover of a cylindrical battery. The cover body 1 is generally an aluminum plate, and mechanisms such as a liquid injection hole, a polar column, an explosion-proof valve and the like are arranged on the cover body. The cover body 1 is provided with a window 101, and the window 101 is aligned with the explosion-proof valve.
The patch assembly 2 is disposed within the window 101 and encloses the window 101. A gap is left between the patch assembly 2 and the explosion-proof valve. When the patch assembly 2 closes the window 101, the pressure in the gap between the patch assembly 2 and the explosion-proof valve will change with temperature; if the pressure in the gap is too high, the patch assembly 2 is extruded to deform, and the gap is leaked.
The solution of the present embodiment is that the patch assembly 2 comprises at least two patch units 21.
Specifically, at least one of the sheet units 21 is lapped on the other sheet unit 21, and the lapped two sheet units 21 are tightly sealed to form a lap joint part 201, and each sheet unit 21 can be elastically deformed under pressure and can be elastically reset. Because the two sheet units 21 are provided with the overlapping area, namely the overlapping part 201, the two sheet units 21 are pressed and tightly attached together under normal conditions, the tightness of the patch assembly 2 for sealing the window 101 is ensured, and the gap between the patch assembly 2 and the explosion-proof valve can be prevented from leaking air, so that no electrolyte flows into the gap to cause pollution during the manufacture of the battery cell; but in the later use process, when the ambient temperature or the temperature of the battery changes, the internal pressure of the gap also changes, and at the moment, the sheet units 21 can generate certain elastic deformation under the action of the pressure, so that the lap joint part 201 of the two sheet units 21 generates smaller gaps, and the gas in the gaps can be discharged through the gaps, thereby adjusting the air pressure in the gaps between the patch assembly 2 and the explosion-proof valve.
In order to provide the sheet unit 21 with the ability to elastically deform and return, the sheet unit 21 may be a thin metal sheet.
In the present embodiment, two sheet units 21 are preferably used, but more sheet units 21 may be used to overlap, so that the sum of the radial cross-sectional areas of each sheet unit 21 is larger than the radial cross-sectional area of the window 101, and the radial cross-sectional areas of each sheet unit 21 are smaller than the radial cross-sectional area of the window 101. When two sheet units 21 are employed, the shape and radial cross-sectional area of the two sheet units 21 may be the same.
Example two
On the basis of the first embodiment, as shown in fig. 1, with reference to fig. 3 and 4, the radial cross-sectional shape of the lap joint 201 is trapezoidal or parallelogram, which can function as the first embodiment.
Example III
On the basis of the first embodiment, as shown in fig. 1, the portion of each sheet unit 21 located at the overlap portion 201 is a seal portion 211, and the cross-sectional shape of the seal portion 211 in the extending direction of the sheet unit 21 is triangular or trapezoidal, so that the portion of the seal portion 211 which does not overlap with respect to the sheet unit 21 is thin, and thus has a better elastic deformability. The end surfaces of the two sheet units 21 overlapped by the sealing portion 211 are flush, contributing to the sealability and the aesthetic appearance.
Example IV
On the basis of the first embodiment, as shown in fig. 1, the part of each sheet unit 21 located at the overlap portion 201 is a sealing portion 211, steps are formed on the sealing portion 211, and the steps of the two sealing portions 211 are mutually matched, so that the structural strength of the sheet unit 21 can be enhanced, and the sheet unit 21 cannot be restored after deformation due to excessive pressure is avoided. The end surfaces of the two sheet units 21 overlapped by the sealing portion 211 are flush, contributing to the sealability and the aesthetic appearance.
Example five
On the basis of the first embodiment, a flange 11 is axially arranged on the inner wall of the window 101 around the window 101, and the flange 11 is lapped on the outer contour edge of the patch assembly 2, so that the patch assembly 2 is prevented from being separated from the window 101.
Example six
The lithium battery of the utility model adopts the lithium battery top cover of any one of the first to fifth embodiments.
The foregoing description of the preferred embodiments of the utility model is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the utility model.
Claims (10)
1. A lithium battery top cap, comprising:
a cover body (1) provided with a window (101);
a patch assembly (2) disposed within the window (101) and enclosing the window (101);
the patch assembly (2) comprises at least two sheet units (21), at least one sheet unit (21) is lapped on the other sheet unit (21), the two sheet units (21) which are lapped are tightly adhered and sealed to form a lapping part (201), and each sheet unit (21) can be elastically deformed under pressure and can be elastically reset.
2. The lithium battery top cover of claim 1, wherein: the sum of the radial cross-sectional areas of the individual sheet elements (21) is greater than the radial cross-sectional area of the window (101).
3. The lithium battery top cover of claim 2, wherein: the radial cross-sectional area of each of the sheet units (21) is smaller than the radial cross-sectional area of the window (101).
4. The lithium battery top cover of claim 2, wherein: at least two of the sheet units (21) have the same shape and radial cross-sectional area.
5. The lithium battery top cover of claim 1, wherein: the radial section shape of the lap joint part (201) is trapezoid or parallelogram.
6. The lithium battery top cover of claim 1, wherein: the part of each sheet unit (21) located at the lap joint part (201) is a sealing part (211), and the cross section of the sealing part (211) along the extending direction of the sheet unit (21) is triangular or trapezoidal.
7. The lithium battery top cover of claim 1, wherein: the part of each sheet unit (21) located at the lap joint part (201) is a sealing part (211), a step is formed on the sealing part (211), and the steps of the two sealing parts (211) are matched with each other.
8. A lithium battery top cover according to claim 6 or 7, characterized in that: the end surfaces of the two sheet units (21) overlapped by the sealing part (211) are flush.
9. The lithium battery top cover of claim 1, wherein: a flange (11) is axially arranged on the inner wall of the window (101) around the window (101), and the flange (11) is lapped on the outer contour edge of the patch assembly (2).
10. A lithium battery employing the lithium battery top cap of any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321507041.0U CN219979744U (en) | 2023-06-14 | 2023-06-14 | Lithium battery top cover and lithium battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321507041.0U CN219979744U (en) | 2023-06-14 | 2023-06-14 | Lithium battery top cover and lithium battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219979744U true CN219979744U (en) | 2023-11-07 |
Family
ID=88587021
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321507041.0U Active CN219979744U (en) | 2023-06-14 | 2023-06-14 | Lithium battery top cover and lithium battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219979744U (en) |
-
2023
- 2023-06-14 CN CN202321507041.0U patent/CN219979744U/en active Active
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| GR01 | Patent grant | ||
| GR01 | Patent grant |