CN216773371U - Cover plate of lithium battery and square battery structure - Google Patents
Cover plate of lithium battery and square battery structure Download PDFInfo
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- CN216773371U CN216773371U CN202123334422.7U CN202123334422U CN216773371U CN 216773371 U CN216773371 U CN 216773371U CN 202123334422 U CN202123334422 U CN 202123334422U CN 216773371 U CN216773371 U CN 216773371U
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- electrode
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Abstract
The utility model provides a cover plate of a lithium battery and a square battery structure, and relates to the technical field of lithium batteries. The cover plate of the lithium battery and the square battery structure provided by the utility model can effectively improve the utilization rate of the internal space of the lithium battery.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, and relates to a cover plate of a lithium battery and a square battery structure.
Background
The lithium battery is a secondary battery composed of two compounds capable of reversibly intercalating and deintercalating lithium ions as positive and negative electrodes, and belongs to a relatively mature and advanced battery.
Lithium cell that adopts in the existing market includes the casing, rolls up core and apron, rolls up the core and includes positive plate and negative pole piece, and positive plate and negative pole piece keep apart through the diaphragm, and the both sides of rolling up the core have the positive plate foil and the negative pole piece foil that stretch out, roll up the core and weld in locating the casing after in the middle of positive plate connection piece and the negative pole connection piece, establish the opening part on casing top and welded seal formation battery with the apron lid again.
The lithium battery has light weight and large electricity storage capacity, and is widely applied by people. The whole industry is in a state of rapid development, the production and marketing scale of the new energy automobile is enlarged at present, the electric quantity of a single automobile is improved, the market of the power battery keeps high-speed growth, a large development space still exists in the future, and the power battery is the heart of the new energy electric automobile and directly influences the endurance and the safety of the electric automobile. The vehicle endurance problem, the battery safety problem and the battery recycling problem are three major factors considered by consumers at present, the total percentage of the factors is 87%, the factors are related to the battery structure, and the safety problem of the battery is greatly improved by improving the battery structure.
In view of the above, the present inventors have designed a cover plate and a square battery structure of a lithium battery through repeated experiments according to production and design experiences in the field and related fields for many years, so as to solve the problems in the prior art.
SUMMERY OF THE UTILITY MODEL
The utility model aims to provide a cover plate of a lithium battery and a square battery structure, which can effectively improve the space utilization rate in the lithium battery.
In order to achieve the above object, the present invention provides a cover plate for a lithium battery, wherein the cover plate includes a cover plate body and two electrode assemblies, the two electrode assemblies are respectively disposed at two ends of the cover plate body, the cover plate body includes a substrate and a stopping frame disposed on a lower surface of the substrate, the electrode assemblies penetrate through the substrate and the stopping frame to fixedly connect the substrate and the stopping frame together, a first boss is disposed at a position where the electrode assemblies are mounted on an upper surface of the substrate, a first groove is correspondingly disposed on a lower surface of the substrate, a second boss is disposed at a position where the upper surface of the stopping frame corresponds to the first groove, and a second groove is disposed at a position where the lower surface of the stopping frame corresponds to the second boss.
The cover plate of the lithium battery comprises an electrode pressing plate, an electrode function plate and an electrode rivet, wherein the electrode pressing plate and the electrode function plate are arranged on the upper surface of the base plate, the electrode rivet is arranged on the lower surface of the stopping frame, and the electrode rivet sequentially penetrates through the stopping frame, the base plate, the electrode function plate and the electrode pressing plate and is fixedly connected with the electrode pressing plate.
The cover plate of the lithium battery as described above, wherein the bottom surface of the electrode rivet protrudes 0.5mm from the lower surface of the stopper frame.
The cap plate for a lithium battery as described above, wherein the two electrode assemblies are a positive electrode assembly and a negative electrode assembly, respectively.
The cover plate for a lithium battery as described above, wherein, in the positive electrode assembly, the electrode pressing plate is a positive electrode pressing plate, the electrode functional plate is a positive electrode weak guide plate, and the electrode rivet is a positive electrode rivet.
The cover plate for a lithium battery as described above, wherein, in the negative electrode assembly, the electrode pressing plate is a positive electrode pressing plate, the electrode function plate is a negative electrode insulating plate, and the electrode rivet is a negative electrode rivet.
The cover plate of the lithium battery comprises a base plate, a stop frame, a plurality of electrode rivets and a sealing ring, wherein the electrode rivets are arranged on the base plate, the stop frame is provided with a through hole, the through hole is used for accommodating the electrode rivets, and the through hole is used for accommodating the electrode rivets.
The cover plate of the lithium battery is characterized in that the base plate is provided with an explosion-proof hole, an explosion-proof valve is arranged in the explosion-proof hole, and an explosion-proof membrane is arranged at the top end cover of the explosion-proof hole.
The cover plate of the lithium battery is characterized in that a top cover patch is further attached to the upper surface of the substrate.
The utility model further provides a square battery structure of the lithium battery, wherein the square battery structure comprises a cover plate and an aluminum shell, the cover plate is the cover plate, the aluminum shell is provided with an accommodating cavity with an upward opening, and the cover plate is covered on the opening of the aluminum shell and welded with the aluminum shell.
Compared with the prior art, the utility model has the following characteristics and advantages:
according to the cover plate and square battery structure of the lithium battery, the bosses are arranged at the two ends of the cover plate body, so that the utilization rate of the internal space of the battery aluminum shell is improved on the premise of ensuring the overall height of the battery, the cover plate body is light and thin, the distance between the upper surface of the electrode pressing plate and the upper surface of the substrate is reduced, and the utilization rate of the internal space of the aluminum shell can be effectively improved under the same model, so that the energy density of the battery is increased.
Drawings
The drawings described herein are for illustration purposes only and are not intended to limit the scope of the present disclosure in any way. In addition, the shapes, the proportional sizes, and the like of the respective members in the drawings are merely schematic for facilitating the understanding of the present invention, and do not specifically limit the shapes, the proportional sizes, and the like of the respective members of the present invention. Those skilled in the art, having the benefit of the teachings of this invention, may effect this invention by selecting various possible shapes and proportional dimensions as appropriate.
Fig. 1 is an exploded view of a cover plate of a lithium battery according to the present invention;
FIG. 2 is a schematic view showing the structure of a prismatic battery of a lithium battery according to the present invention;
FIG. 3 is a partial schematic view of a first boss of the present invention;
FIG. 4 is a partial view of a first groove of the present invention;
FIG. 5 is a partial schematic view of a second boss of the present invention;
FIG. 6 is a partial schematic view of a second groove of the present invention;
fig. 7 is a schematic view showing the installation of the electrode rivet in the present invention.
Description of reference numerals:
100. a cover plate; 10. A cover plate body;
11. a substrate; 111. A first boss;
112. a first groove; 12. A stopper frame;
121. a second boss; 122. A second groove;
13. a stepped through hole; 131. A small-bore end;
132. a large-caliber end; 14. An explosion-proof hole;
15. an explosion-proof valve; 16. An explosion-proof membrane;
20. an electrode assembly; 21. An electrode pressing plate;
22. an electrode function plate; 23. An electrode rivet;
24. a seal ring; 20', a positive electrode assembly;
21', a positive electrode pressing plate; 22' and a positive weak guide plate;
23', a positive electrode rivet; 25', a positive connecting sheet;
20 ", a negative electrode assembly; 21 ", a negative electrode pressure plate;
22', negative electrode insulating plate; 23 ", a negative electrode rivet;
25', a negative connecting sheet; 30. A top cover patch;
200. an aluminum shell; 300. An electric core;
400. and (5) coating the mixture outside.
Detailed Description
The details of the present invention can be more clearly understood in conjunction with the accompanying drawings and the description of the embodiments of the present invention. However, the specific embodiments of the present invention described herein are for the purpose of illustration only and are not to be construed as limiting the utility model in any way. Any possible variations based on the present invention may be conceived by the skilled person in the light of the teachings of the present invention, and these should be considered to fall within the scope of the present invention.
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 be present.
The present invention provides a cover plate 100 for a lithium battery, as shown in fig. 1 to 7, the cover plate 100 includes a cover plate body 10 and two electrode assemblies, the two electrode assemblies are respectively disposed at two ends of the cover plate body 10, the cover plate body 10 includes a base plate 11 and a stopping frame 12 disposed at a bottom surface of the base plate 11, the electrode assemblies penetrate through the base plate 11 and the stopping frame 12 to fixedly connect the base plate 11 and the stopping frame 12 together, a first protrusion 111 is disposed at a position where the electrode assemblies are mounted on an upper surface of the base plate 11, a first recess 112 is correspondingly disposed at a lower surface of the base plate 11, a second protrusion 121 is disposed at a position where the upper surface of the stopping frame 12 corresponds to the first recess 112, and a second recess 122 is disposed at a position where the lower surface of the stopping frame 12 corresponds to the second protrusion 121.
The utility model also provides a square battery structure, which comprises a cover plate 100 and an aluminum shell 200, wherein the aluminum shell 200 is provided with an accommodating cavity with an upward opening, and the cover plate 100 is covered on the opening of the aluminum shell 200 and is welded with the aluminum shell 200.
According to the cover plate 100 of the lithium battery and the square battery structure, the upper surface of the substrate 11 is provided with the first boss 111, and the lower surface of the substrate is provided with the first groove 112; the upper surface of the stopping frame 12 is provided with a second boss 121, the lower surface is provided with a second groove 122, the second boss 121 on the upper surface of the stopping frame 12 is aligned and matched with the first groove 112, so that the positioning and the assembly between the substrate 11 and the stopping frame 12 are facilitated, the assembly efficiency of the substrate 11 and the stopping frame 12 is improved, and the assembly strength of the substrate 11 and the stopping frame 12 is also improved; in addition, the second groove 122 formed on the lower surface of the stopper frame 12 also effectively improves the utilization of the space below the cover plate 100 (i.e., the space inside the aluminum case 200).
According to the cover plate 100 and the square battery structure of the lithium battery, the bosses are arranged at the two ends of the cover plate body 10, on the premise that the overall height of the battery is guaranteed, the utilization rate of the internal space of the battery aluminum shell 200 is improved, the cover plate body 10 is light and thin, the distance between the upper surface of the electrode pressing plate and the upper surface of the substrate 11 is reduced, the utilization rate of the internal space of the aluminum shell 200 can be effectively improved under the same model, and therefore the energy density of the battery is increased.
In an alternative embodiment of the present invention, the electrode assembly 20 includes an electrode pressing plate 21, an electrode function plate 22 and an electrode rivet 23, wherein the electrode pressing plate 21 and the electrode function plate 22 are disposed on the upper surface of the base plate 11, the electrode rivet 23 is disposed on the lower surface of the stopper frame 12, and the electrode rivet 23 sequentially penetrates through the stopper frame 12, the base plate 11, the electrode function plate 22 and the electrode pressing plate 21 and is fixedly connected to the electrode pressing plate 21. With the above structure, the base plate 11 and the stopper frame 12 are fixedly connected as a whole by the electrode assembly 20; meanwhile, since the electrode rivet 23 is disposed in the second groove 122 of the lower surface of the stopper frame 12, the internal space of the aluminum case 200 is effectively saved. In addition, since the electrode rivet 23 is disposed at the bottom of the stopper frame 12, the surface of the electrode pressing plate 21 is not depressed to be concave, the flatness of the electrode pressing plate 21 is good, and the structure of the cap plate 100 is simple, the number of assembly processes is greatly reduced, the assembly is simple, and the cost is reduced to a certain extent.
In an alternative example of this embodiment, the bottom surface of the electrode rivet 23 protrudes 0.5mm from the lower surface of the stopper frame 12.
In an alternative embodiment of the present invention, the two electrode assemblies 20 are a positive electrode assembly 20' and a negative electrode assembly 20 ", respectively.
In an alternative example of this embodiment, in positive electrode assembly 20 ', electrode pressing plate 21 is positive electrode pressing plate 21', electrode functional plate 22 is positive electrode weak lead 22 ', and electrode rivet 23 is positive electrode rivet 23'. The positive electrode pressing plate 21 'and the positive electrode weak guide plate 22' are arranged on the top surface of the cover plate body 10, the positive electrode rivet 23 'is arranged on the bottom surface of the cover plate body 10, and the positive electrode rivet 23' penetrates through the cover plate body 10 and the positive electrode weak guide plate 22 'from bottom to top in sequence and is fixedly connected with the positive electrode pressing plate 21'.
In an alternative example, the positive electrode assembly 20 ' further includes a positive electrode tab 25 ' and a positive electrode protective sheet '. The upper surface of the positive electrode tab 25 'is connected to the bottom end of the positive electrode rivet 23'.
In an alternative example of this embodiment, in the negative electrode assembly 20 ″, the electrode pressing plate 21 is a negative electrode pressing plate 21 ″, the electrode function plate 22 is a negative electrode insulating plate 22 ″, and the electrode rivet 23 is a negative electrode rivet 23 ″. The negative electrode pressing plate 21 'and the negative electrode insulating plate 22' are arranged on the top surface of the cover plate body 10, the negative electrode rivet 23 'is arranged on the bottom surface of the cover plate body 10, and the negative electrode rivet 23' penetrates through the cover plate body 10 and the negative electrode weak insulating plate 22 'from bottom to top in sequence and is fixedly connected with the negative electrode pressing plate 21'.
In an alternative example, negative electrode assembly 20 "further includes negative electrode tab 25". The upper surface of the negative electrode tab 25 "is connected to the bottom end of the negative electrode rivet 23'.
In an alternative example, the electrode rivet 23 is welded and fixed with the electrode pressure plate 21, and the conduction of the positive and negative current is realized. Specifically, the top of the positive electrode rivet 23 'is welded to the positive electrode pressing plate 21', and the top of the negative electrode rivet 23 ″ is welded to the negative electrode pressing plate 21 ″ to achieve conduction of the positive electrode current and the negative electrode current.
In an alternative example, the electrode platen 21 is stamped from aluminum plate, the positive electrode rivet 23' is stamped from aluminum rod, and the negative electrode rivet 23 "is stamped from copper rod.
In the example of the embodiment, the stopper holder 12 has stepped through holes 13 formed at both ends thereof, through which the electrode rivets 23 are inserted, respectively, one end of the stepped through hole 13 is a small-diameter end 131, the other end of the stepped through hole 13 is a large-diameter end 132, the large-diameter end 132 is disposed to face away from the substrate 11, and the seal ring 24 is fitted into the large-diameter end 132, so that the seal ring 24 can be sealingly engaged with the electrode rivets 23. The sealing of the electrode rivet 23 and the stopper frame 12 is achieved by pressing and fixing the sealing ring 24 by the electrode rivet 23 (the positive electrode rivet 23' or the negative electrode rivet 23 "), and the sealing performance of the cover plate 100 is ensured, and the compression amount of the sealing ring 24 is easier to control because the sealing ring 24 is arranged at the large-caliber end 132 of the stepped through hole 13.
In an alternative example of this embodiment, the stopper frame 12 is an integral injection molding structure to ensure the sealing effect, and the base plate 11 is formed by stamping an aluminum plate.
In an alternative example of this embodiment, the base plate 11 is provided with an explosion-proof hole 14, an explosion-proof valve 15 is installed in the explosion-proof hole 14, and the explosion-proof valve 15 is formed by punching an aluminum sheet and is welded on the explosion-proof hole 14 by laser to realize overvoltage protection for the inside of the battery case.
In an alternative example, the explosion-proof valve 15 is fixed to the inner wall of the explosion-proof hole 14 by laser welding.
In an alternative example, the top end cap of the explosion proof hole 14 is provided with an explosion proof membrane 16.
In an alternative example of the present invention, a top cover patch 30 is further attached to the upper surface of the substrate 11 to protect and insulate the cover body 10.
Referring to fig. 1 to 5, the working principle of the cover plate 100 and the square battery structure of the lithium battery according to the present invention is as follows:
firstly welding the explosion-proof valve 15 on the explosion-proof hole 14 of the substrate 11, then placing the substrate 11 on the top of the stop frame 12, then respectively fixing the anode weak guide plate 22 'and the cathode insulation plate 22' on the two ends of the substrate 11, then respectively sleeving the seal ring 24 on the anode rivet 23 'and the cathode rivet 23', respectively penetrating the anode rivet 23 'and the cathode rivet 23' through the stepped through hole 13 of the stop frame 12, the substrate 11, the anode weak guide plate 22 'and the cathode insulation plate 22', pressing the anode rivet 23 'and the cathode rivet 23' to make the seal ring 24 arranged on the large-aperture end of the stepped through hole 13 of the stop frame 12, and finally welding and fixing the top of the anode rivet 23 'and the top of the cathode rivet 23' with the anode pressing plate 21 'and the cathode pressing plate 21', thus completing the assembly of the structure of the cover plate 100. The electric core 300 is arranged in the accommodating cavity of the aluminum shell 200, the cover plate 100 covers the opening of the aluminum shell 200, the cover plate 100 and the aluminum shell 200 are welded by laser to complete the sealing of the whole battery structure, and the aluminum shell 200 is sealed by the outer encapsulation 400.
The present invention is not limited to the above embodiments, and in particular, various features described in different embodiments can be arbitrarily combined with each other to form other embodiments, and the features are understood to be applicable to any embodiment except the explicitly opposite descriptions, and are not limited to the described embodiments.
Claims (10)
1. The utility model provides an apron of lithium cell, its characterized in that, the apron includes apron body and two electrode subassembly, two electrode subassembly set up respectively in the both ends of apron body, the apron body includes the base plate and locates the stop frame of base plate lower surface, electrode subassembly runs through the base plate with the stop frame will the base plate with stop frame fixed connection is in the same place, surface mounting on the base plate the position department of electrode subassembly is equipped with first boss, the base plate lower surface correspondence is equipped with first recess, the upper surface of stop frame corresponds the position department of first recess is equipped with the second boss, the lower surface correspondence of stop frame the position department of second boss is equipped with the second recess.
2. The cap plate for a lithium battery according to claim 1, wherein the electrode assembly comprises an electrode pressing plate, an electrode function plate and an electrode rivet, the electrode pressing plate and the electrode function plate are disposed on the upper surface of the base plate, the electrode rivet is disposed on the lower surface of the stopper frame, and the electrode rivet sequentially penetrates through the stopper frame, the base plate, the electrode function plate and the electrode pressing plate and is fixedly connected to the electrode pressing plate.
3. The cap plate for a lithium battery as claimed in claim 2, wherein the bottom surface of the electrode rivet protrudes from the lower surface of the stopper frame by 0.5mm.
4. The cap plate for a lithium battery as claimed in claim 2, wherein the two electrode assemblies are a positive electrode assembly and a negative electrode assembly, respectively.
5. The cap plate for a lithium battery according to claim 4, wherein in the positive electrode assembly, the electrode pressing plate is a positive electrode pressing plate, the electrode function plate is a positive electrode weak guide plate, and the electrode rivet is a positive electrode rivet.
6. The cap plate for a lithium battery according to claim 4, wherein in the negative electrode assembly, the electrode pressing plate is a positive electrode pressing plate, the electrode function plate is a negative electrode insulating plate, and the electrode rivet is a negative electrode rivet.
7. The cover plate for a lithium battery according to claim 2, wherein a stepped through hole is formed at each of both ends of the stopper frame, the stepped through hole having a small-diameter end at one end and a large-diameter end at the other end, the large-diameter end being disposed opposite to the base plate, and a sealing ring being embedded in the large-diameter end and capable of being sealingly engaged with the electrode rivet.
8. The cover plate for a lithium battery according to claim 1, wherein the base plate is formed with an explosion-proof hole, an explosion-proof valve is installed in the explosion-proof hole, and an explosion-proof membrane is provided at a top end cap of the explosion-proof hole.
9. The cover sheet for a lithium battery as claimed in claim 1, wherein a top cover patch is further attached to the upper surface of the substrate.
10. A prismatic battery structure of a lithium battery, characterized in that the prismatic battery structure comprises a cover plate and an aluminum shell, the cover plate is the cover plate of any one of claims 1 to 9, the aluminum shell has a receiving cavity with an upward opening, and the cover plate is covered on the opening of the aluminum shell and welded with the aluminum shell.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123334422.7U CN216773371U (en) | 2021-12-28 | 2021-12-28 | Cover plate of lithium battery and square battery structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202123334422.7U CN216773371U (en) | 2021-12-28 | 2021-12-28 | Cover plate of lithium battery and square battery structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216773371U true CN216773371U (en) | 2022-06-17 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202123334422.7U Active CN216773371U (en) | 2021-12-28 | 2021-12-28 | Cover plate of lithium battery and square battery structure |
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| Country | Link |
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| CN (1) | CN216773371U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116598729A (en) * | 2023-07-12 | 2023-08-15 | 深圳海辰储能控制技术有限公司 | End cover assembly, battery cell, battery assembly and energy storage system |
-
2021
- 2021-12-28 CN CN202123334422.7U patent/CN216773371U/en active Active
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116598729A (en) * | 2023-07-12 | 2023-08-15 | 深圳海辰储能控制技术有限公司 | End cover assembly, battery cell, battery assembly and energy storage system |
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