CN215418334U - Explosion-proof square lithium battery shell - Google Patents
Explosion-proof square lithium battery shell Download PDFInfo
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- CN215418334U CN215418334U CN202120956840.0U CN202120956840U CN215418334U CN 215418334 U CN215418334 U CN 215418334U CN 202120956840 U CN202120956840 U CN 202120956840U CN 215418334 U CN215418334 U CN 215418334U
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- explosion
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- lithium battery
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model provides an explosion-proof square lithium battery shell, which comprises a square shell, and a positive electrode cover plate and a negative electrode cover plate which are respectively arranged at two ends of the square shell; the explosion-proof structure is characterized in that one end of the positive cover plate is provided with a positive explosion-proof hole; one end of the negative electrode cover plate is provided with a negative electrode explosion-proof hole; the positive explosion-proof hole and the negative explosion-proof hole have the same structure; and the explosion-proof sticking films and the explosion-proof sheets are arranged in the positive explosion-proof hole and the negative explosion-proof hole respectively. The method can avoid the explosion-proof sticking film from being scraped or damaged due to collision or shaking in the production and assembly process of the lithium battery, and also avoid the explosion-proof sticking film from being punctured when the lithium battery shell is welded, thereby effectively protecting the explosion-proof sheet arranged in the explosion-proof hole and ensuring that the lithium battery cannot leak electrolyte; in addition, the explosion-proof adhesive film can not protrude out of the end surfaces of the positive and negative cover plates, so that the end surfaces of the positive and negative cover plates are always kept as a plane, and the design of a tool to be positioned by the end surfaces of the positive and negative cover plates is optimized.
Description
Technical Field
The utility model relates to the technical field of explosion prevention of lithium batteries, in particular to an explosion-proof square lithium battery shell.
Background
Lithium batteries are a type of battery using a nonaqueous electrolyte solution with lithium metal or a lithium alloy as a negative electrode material. The lithium battery has the characteristics of light weight, large energy storage, no pollution, long service life and the like, so the lithium battery is widely applied to various industries, such as national defense industry and aviation field, small-to-new energy automobiles, UPS energy storage base stations and the like. In order to ensure the use safety of the lithium battery, explosion-proof holes for air release and pressure relief are usually required to be processed on the positive and negative cover plates in the processing process of the lithium battery, so that the explosion of the battery caused by the expansion of internal gas due to the rise of temperature and the increase of air pressure in the operation process of the lithium battery are avoided.
At present, explosion-proof adhesive films of square lithium battery shells on the market are directly adhered to the outer surfaces of positive and negative cover plates, the explosion-proof adhesive films are easy to fall off due to collision or friction, and the explosion-proof adhesive films are damaged when the positive and negative cover plates are subjected to laser welding; and when the end surfaces of the positive and negative cover plates are positioned in the installation process, the explosion-proof adhesive film needs to be subjected to abdication treatment, so that the manufacturing of the lithium battery tool clamp is complicated.
SUMMERY OF THE UTILITY MODEL
Based on the above, the embodiment of the utility model provides an explosion-proof square lithium battery shell, aiming at solving the problems that explosion-proof adhesive films of the square lithium battery shell above the market are directly adhered to the outer surfaces of positive and negative cover plates, the explosion-proof adhesive films are easy to fall off due to collision or friction, and the explosion-proof adhesive films are damaged when the positive and negative cover plates are subjected to laser welding; and when the terminal surface to positive and negative apron was fixed a position in the installation, need step down the processing to the explosion-proof pad pasting for the problem of lithium cell frock clamp's preparation complicacy.
In order to achieve the purpose, the utility model provides the following technical scheme:
an explosion-proof square lithium battery shell comprises a square shell body, and a positive electrode cover plate and a negative electrode cover plate which are respectively arranged at two ends of the square shell body; one end of the positive cover plate is provided with a positive explosion-proof hole; one end of the negative electrode cover plate is provided with a negative electrode explosion-proof hole; the positive explosion-proof hole and the negative explosion-proof hole have the same structure; and the explosion-proof sticking films and the explosion-proof sheets are arranged in the positive explosion-proof hole and the negative explosion-proof hole respectively.
Further, the explosion-proof adhesive film is a circular explosion-proof adhesive film; the explosion-proof sheet is a circular explosion-proof sheet; the explosion-proof sticking film and the explosion-proof sheet are coaxially arranged; the diameter of the explosion-proof pad pasting is larger than that of the explosion-proof sheet.
Further, the positive explosion-proof hole comprises a counter bore, a first through hole and a second through hole which are coaxially arranged; one end of the first through hole is connected with the counter bore, and the other end of the first through hole is connected with the second through hole.
Further, the aperture of the first through hole is smaller than that of the second through hole; the aperture of the second through hole is smaller than that of the counter bore.
Furthermore, the explosion-proof adhesive film is arranged in the counter bore after covering one end of the first through hole far away from the second through hole; the thickness of the explosion-proof sticking film is smaller than the depth of the counter bore, so that the explosion-proof sticking film is prevented from exceeding the top of the counter bore, and the explosion-proof sticking film is effectively prevented from being scraped and damaged; meanwhile, the explosion-proof film does not exceed the top of the counter bore, so that the end face, far away from the rectangular shell, of the positive cover plate always keeps a plane, and the design of a tool to be positioned by the positive cover plate is optimized.
Further, the explosion-proof pad pasting and the counter bore are in interference fit. The explosion-proof pad pasting closely laminates with the pore wall of counter bore, has strengthened effectively the fastness of explosion-proof pad pasting, avoids because rock and lead to follow drop in the counter bore.
Furthermore, the explosion-proof sheet is arranged in the second through hole after covering one end of the first through hole, which is far away from the counter bore; the thickness of the explosion-proof sheet is smaller than the depth of the second through hole; the diameter of the explosion-proof piece is smaller than the aperture of the second through hole. In the utility model, as the diameter of the explosion-proof sheet is smaller than the aperture of the second through hole, a gap is reserved between the edge of the explosion-proof sheet and the hole wall of the second through hole, when the temperature of the lithium battery rises to cause the internal gas to expand and the gas pressure increases to a certain degree, the gap can reserve enough space for the welding or rupture of the explosion-proof sheet, so that the interior of the lithium battery is connected with the outside through the explosion-proof hole to accelerate deflation and pressure release, thereby effectively avoiding the explosion of the lithium battery.
Furthermore, the positive cover plate is also provided with a liquid injection hole for injecting electrolyte solution.
Furthermore, the explosion-proof pad pasting is the explosion-proof pad pasting that the gas permeability is good, helps the gassing pressure release of lithium cell, prevents the explosion.
According to the explosion-proof square lithium battery shell, the counter bore for sticking the explosion-proof adhesive film is arranged on the explosion-proof hole, so that the explosion-proof adhesive film does not protrude out of the positive and negative cover plates, the explosion-proof adhesive film is prevented from being scraped or damaged due to collision or shaking in the production and assembly processes of the lithium battery, meanwhile, the explosion-proof adhesive film is prevented from being punctured during welding of the lithium battery shell, the explosion-proof sheet arranged in the explosion-proof hole is effectively protected, and the lithium battery is prevented from leaking electrolyte; in addition, the explosion-proof adhesive film can not protrude out of the end surfaces of the positive and negative cover plates, so that the end surfaces of the positive and negative cover plates are always kept as a plane, and the design of a tool to be positioned by the end surfaces of the positive and negative cover plates is optimized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is an exploded schematic view of an explosion-proof prismatic lithium battery case according to an embodiment of the present invention;
fig. 2 is a cross-sectional view of the positive electrode cap plate of fig. 1;
fig. 3 is an enlarged view of a portion a of fig. 2.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that, if directional indications (such as up, down, left, right, front, back, top and bottom … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawing), and if the specific posture is changed, the directional indications are changed accordingly.
In this application, unless expressly stated or limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can include, for example, fixed connections, removable connections, or integral parts; can be mechanically or electrically connected; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meaning of the above terms in the present application can be understood by those of ordinary skill in the art as appropriate.
It will be understood that when an element is referred to as being "secured to" or "disposed on" another element, it can be directly on the other element or intervening elements may also be present. When an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present.
In addition, if there is a description of "first", "second", etc. in an embodiment of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. In addition, technical solutions between various embodiments may be combined with each other, but must be realized by a person skilled in the art, and when the technical solutions are contradictory or cannot be realized, such a combination should not be considered to exist, and is not within the protection scope of the present invention.
At present, explosion-proof adhesive films of square lithium battery shells on the market are directly adhered to the outer surfaces of positive and negative cover plates, the explosion-proof adhesive films are easy to fall off due to collision or friction, and the explosion-proof adhesive films are damaged when the positive and negative cover plates are subjected to laser welding; and when the end surfaces of the positive and negative cover plates are positioned in the installation process, the explosion-proof adhesive film needs to be subjected to abdication treatment, so that the manufacturing of the lithium battery tool clamp is complicated. In order to solve the technical problem, the utility model provides an explosion-proof square lithium battery shell.
As shown in fig. 1, an explosion-proof square lithium battery case provided in an embodiment of the present invention includes a square case 1, and a positive electrode cover plate 2 and a negative electrode cover plate 3 respectively disposed at two ends of the square case 1; one end of the positive cover plate 2 is provided with a positive explosion-proof hole 21; one end of the negative electrode cover plate 3 is provided with a negative electrode explosion-proof hole 31; the positive explosion-proof hole 21 and the negative explosion-proof hole 31 have the same structure; explosion-proof pad pasting 4 and explosion-proof piece 5 are all arranged in positive explosion-proof hole 21 and negative explosion-proof hole 31.
The explosion-proof adhesive film 4 is a circular explosion-proof adhesive film; the explosion-proof sheet 5 is a circular explosion-proof sheet; the explosion-proof sticking film 4 and the explosion-proof sheet 5 are coaxially arranged; the diameter of the explosion-proof film 4 is larger than that of the explosion-proof sheet 5. When the interior of the lithium battery reaches a certain pressure, the explosion-proof sheet can be preferentially broken instead of the whole lithium battery shell, so that the lithium battery shell is protected; the explosion-proof pad pasting can protect the explosion-proof piece, prevents that the explosion-proof piece from being destroyed by the foreign matter. Referring to fig. 2 and fig. 3, in the present embodiment, the positive explosion-proof hole 21 includes a counter bore 211, a first through hole 212, and a second through hole 213, which are coaxially disposed; one end of the first through hole 212 is connected to the counterbore 211, and the other end is connected to the second through hole 213.
The aperture of the first through hole 212 is smaller than that of the second through hole 213; the aperture of the second through hole 213 is smaller than that of the counterbore 211. The aperture of the counter bore 211 is larger than that of the first through hole 212, so that enough pasting yielding space can be provided for the explosion-proof film, and effective pasting of the explosion-proof film is guaranteed. The second through hole 213 has a larger diameter than the first through hole 212, so as to provide sufficient welding space for the rupture disk and ensure effective welding of the rupture disk.
The explosion-proof film 4 covers one end of the first through hole 212 far away from the second through hole 213 and is arranged in the counter bore 211; the thickness of the explosion-proof film 4 is smaller than the depth of the counter bore 211, so that the explosion-proof film 4 is prevented from exceeding the top of the counter bore 211, and the explosion-proof film 4 is effectively prevented from being scraped and damaged; meanwhile, the explosion-proof film 4 cannot exceed the top of the counter bore 211, so that the end face, far away from the rectangular shell 1, of the positive cover plate 2 always keeps a plane, and the design of a tool to be positioned by the positive cover plate 2 is optimized.
In this embodiment, after the explosion-proof film 4 covers the first through hole 212, external foreign matters can be prevented from penetrating the explosion-proof sheet 5 after entering from the positive explosion-proof hole 21, so that leakage of the lithium battery in the liquid injection process is prevented. Similarly, on the negative cover plate 3, the explosion-proof film 4 plays the same role, and can prevent external foreign matters from penetrating the explosion-proof sheet 5 after entering from the negative explosion-proof hole 31, so that leakage of the lithium battery in the liquid injection process is prevented.
The explosion-proof film 4 is in interference fit with the counter bore 211. The explosion-proof pad pasting 4 is closely attached to the hole wall of the counter bore 211, so that the firmness of the explosion-proof pad pasting 4 is effectively enhanced, and the phenomenon that the explosion-proof pad pasting falls off from the inside of the counter bore 211 due to shaking is avoided.
The explosion-proof sheet 5 is arranged in the second through hole 213 after covering one end of the first through hole 212 far away from the counter bore 211; the thickness of the explosion-proof sheet 5 is smaller than the depth of the second through hole 213; the diameter of the explosion-proof sheet 5 is smaller than the diameter of the second through hole 213. In this embodiment, because the diameter of explosion-proof piece 5 is less than the aperture of second through-hole 213, make the edge of explosion-proof piece 5 with leave the clearance between the pore wall of second through-hole 213, when the lithium cell intensification leads to inside gas inflation, when gas pressure increases to a certain extent, the clearance can be for explosion-proof piece 5 desolders or breaks and leaves sufficient space, makes inside passing through of lithium cell explosion-proof hole 21 is connected with the external world, and the pressure release of bleeding accelerates to the explosion of lithium cell has been avoided effectively.
Referring to fig. 1 again, in the present embodiment, the positive electrode cover plate 2 is further provided with a liquid injection hole 22 for injecting an electrolyte solution.
The explosion-proof pad pasting 4 is the explosion-proof pad pasting that the gas permeability is good, helps the gassing pressure release of lithium cell, prevents the explosion.
According to the explosion-proof square lithium battery shell, the counter bore used for sticking the explosion-proof sticking film 4 is arranged on the explosion-proof hole 21, so that the explosion-proof sticking film 4 does not protrude out of the positive and negative electrode cover plates, the explosion-proof sticking film is prevented from being scraped or damaged due to collision or shaking in the production and assembly process of the lithium battery, meanwhile, the explosion-proof sticking film is prevented from being punctured when the lithium battery shell is welded, the explosion-proof sheet 5 arranged in the explosion-proof hole 21 is effectively protected, and the lithium battery is prevented from leaking electrolyte; in addition, the explosion-proof adhesive film 4 can not protrude out of the end surfaces of the positive and negative cover plates, so that the end surfaces of the positive and negative cover plates are always kept as a plane, and the design of a tool to be positioned by the end surfaces of the positive and negative cover plates is optimized.
The above description is only a preferred embodiment of the present invention, and not intended to limit the scope of the present invention, and all modifications and equivalents of the technical solutions of the present invention, which are made by using the contents of the present specification and the accompanying drawings, or directly/indirectly applied to other related technical fields, are included in the scope of the present invention.
Claims (9)
1. An explosion-proof square lithium battery shell is characterized by comprising a square shell, and a positive electrode cover plate and a negative electrode cover plate which are respectively arranged at two ends of the square shell; one end of the positive cover plate is provided with a positive explosion-proof hole; one end of the negative electrode cover plate is provided with a negative electrode explosion-proof hole; the positive explosion-proof hole and the negative explosion-proof hole have the same structure; and the explosion-proof sticking films and the explosion-proof sheets are arranged in the positive explosion-proof hole and the negative explosion-proof hole respectively.
2. The explosion-proof square lithium battery case of claim 1, wherein the explosion-proof adhesive film is a circular explosion-proof adhesive film; the explosion-proof sheet is a circular explosion-proof sheet; the explosion-proof sticking film and the explosion-proof sheet are coaxially arranged; the diameter of the explosion-proof pad pasting is larger than that of the explosion-proof sheet.
3. The explosion-proof square lithium battery case of claim 2, wherein the positive explosion-proof hole comprises a counter bore, a first through hole and a second through hole which are coaxially arranged; one end of the first through hole is connected with the counter bore, and the other end of the first through hole is connected with the second through hole.
4. The explosion-proof prismatic lithium battery case of claim 3, wherein the aperture of the first through-hole is smaller than the aperture of the second through-hole; the aperture of the second through hole is smaller than that of the counter bore.
5. The explosion-proof square lithium battery case as claimed in claim 3, wherein the explosion-proof adhesive film is disposed in the counter bore after covering one end of the first through hole away from the second through hole; the thickness of the explosion-proof pad pasting is smaller than the depth of the counter bore.
6. An explosion-proof prismatic lithium battery case as claimed in claim 3, wherein said explosion-proof foil is interference-fitted with said counterbore.
7. The explosion-proof square lithium battery shell as claimed in claim 3, wherein the explosion-proof sheet is arranged in the second through hole after covering one end of the first through hole far away from the counter bore; the thickness of the explosion-proof sheet is smaller than the depth of the second through hole; the diameter of the explosion-proof piece is smaller than the aperture of the second through hole.
8. The explosion-proof prismatic lithium battery case of claim 1, wherein the positive electrode cover plate is further provided with a liquid injection hole for injecting an electrolyte solution.
9. An explosion-proof prismatic lithium battery case according to claim 1, wherein said explosion-proof adhesive film is an explosion-proof adhesive film having good air permeability.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120956840.0U CN215418334U (en) | 2021-05-06 | 2021-05-06 | Explosion-proof square lithium battery shell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202120956840.0U CN215418334U (en) | 2021-05-06 | 2021-05-06 | Explosion-proof square lithium battery shell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN215418334U true CN215418334U (en) | 2022-01-04 |
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ID=79674329
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202120956840.0U Active CN215418334U (en) | 2021-05-06 | 2021-05-06 | Explosion-proof square lithium battery shell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN215418334U (en) |
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2021
- 2021-05-06 CN CN202120956840.0U patent/CN215418334U/en active Active
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