CN216818546U - Square shell battery cell - Google Patents
Square shell battery cell Download PDFInfo
- Publication number
- CN216818546U CN216818546U CN202220391657.5U CN202220391657U CN216818546U CN 216818546 U CN216818546 U CN 216818546U CN 202220391657 U CN202220391657 U CN 202220391657U CN 216818546 U CN216818546 U CN 216818546U
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- China
- Prior art keywords
- battery cell
- shell
- square
- explosion
- proof valve
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- 238000003466 welding Methods 0.000 claims description 7
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 239000007921 spray Substances 0.000 abstract description 3
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000000034 method Methods 0.000 description 4
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 3
- 229910052744 lithium Inorganic materials 0.000 description 3
- 238000000576 coating method Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000004080 punching Methods 0.000 description 2
- 238000004804 winding Methods 0.000 description 2
- 229910000838 Al alloy Inorganic materials 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 239000011248 coating agent Substances 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 239000007888 film coating Substances 0.000 description 1
- 238000009501 film coating Methods 0.000 description 1
- 238000003475 lamination Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
- 239000004575 stone Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 229920001169 thermoplastic Polymers 0.000 description 1
- 239000004416 thermosoftening plastic Substances 0.000 description 1
Images
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
- Gas Exhaust Devices For Batteries (AREA)
Abstract
The utility model discloses a square-shell battery cell. It includes naked electric core, casing, anodal apron and negative pole apron, naked electric core is installed inside the casing, and the anodal utmost point ear and the negative pole utmost point ear of naked electric core stretch out casing both ends and anodal apron and negative pole apron fixed connection respectively, the side of casing is equipped with explosion-proof valve. According to the utility model, the explosion-proof valve is arranged on the side surface of the battery cell, so that the direction of a spray valve for releasing pressure of the battery cell is changed, the pressure releasing direction is kept away from a passenger compartment above the battery pack, and the safety performance is improved.
Description
Technical Field
The utility model belongs to the technical field of new energy of lithium batteries, and particularly relates to a square-shell battery cell.
Background
When the application of the front shell lithium ion battery cell in a new energy automobile is gradually wide, the demand is rapidly expanded, and the battery safety guarantee is a base stone for popularizing the new energy application of the lithium battery. The explosion-proof valve on the square-shell battery core plays a role in releasing internal pressure in advance when the battery core is out of thermal runaway, prevents the battery core from exploding, and is a vital component for the safety of the lithium battery.
The battery package system of new forms of energy passenger car mainly sets up in the below chassis department in passenger cabin, and the explosion-proof valve of square shell electricity core sets up the position that makes progress at electric core usually, with utmost point post homonymy, when electric core emergence thermal runaway, explosion-proof valve releases pressure in advance, and electric core opens the valve, and gas can upwards spout, and it easily causes the safety risk to the passenger cabin that is in the battery package top when the reaction is violent. Meanwhile, the square-shell battery cell is complex in manufacturing process, and a plurality of structural components are needed inside the battery cell to solve the problems of supporting and insulating.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the defects of the background technology and provide a square-shell battery cell with simple structure and high safety.
The technical scheme adopted by the utility model is as follows: the utility model provides a square shell electricity core, includes naked electric core, casing, anodal apron and negative pole apron, naked electric core is installed inside the casing, and the anodal utmost point ear and the negative pole utmost point ear of naked electric core stretch out casing both ends and anodal apron and negative pole apron fixed connection respectively, a side of casing is equipped with explosion-proof valve.
Further, the shell is of a square column structure with two ends penetrating through, and the explosion-proof valve is arranged on any one side face of the shell.
Further, the side of the housing is formed with a recess by stamping, the recess forming the explosion-proof valve.
Further, the thickness of the explosion-proof valve is smaller than that of the side face of the shell.
Further, the thickness of the explosion-proof valve is 0.1-0.95 times of the thickness of the side face of the shell.
Furthermore, the area of the explosion-proof valve is 2-10 times of the capacity value of the battery cell.
Further, naked electric core surface is whole to be covered with the insulating film.
Further, the insulating film is a pp insulating film or a PI insulating film or a PET insulating film.
Further, the thickness of the insulating film is 0.02-2 mm.
Furthermore, the positive electrode lug and the negative electrode lug both comprise a plurality of layers of single lug sheets, and the plurality of layers of single lug sheets are welded to form an integral plane structure.
According to the utility model, the explosion-proof valve is arranged on the side surface of the shell, so that the direction of a spray valve for releasing pressure of the battery cell is changed, the pressure releasing direction is kept away from a passenger compartment above the battery pack, and the safety performance is improved; meanwhile, insulation protection assembly is carried out on the naked electric core (which can be a winding electric core and a lamination electric core) by adopting the insulation film, so that intermediate materials of the electric core manufacture procedure are reduced, the manufacture procedure process is simplified, the space utilization rate of the inside of the square shell electric core is improved, the production efficiency can be greatly improved, the cost of the electric core is reduced, the energy density of the battery pack is improved while the safety performance of the new energy electric vehicle is improved, and the endurance mileage of the new energy electric vehicle is prolonged.
Drawings
Fig. 1 is an exploded view of the present invention.
Fig. 2 is a schematic diagram of a cell and an insulating film according to the present invention.
Fig. 3 is a schematic diagram of a battery cell and a negative electrode cover plate according to the present invention.
Fig. 4 is a schematic view of the housing of the present invention.
Fig. 5 is a cross-sectional view of the explosion-proof valve of the present invention on a housing.
In the figure, 1 — bare cell; 2-positive pole ear; 3-a negative pole tab; 4-an insulating film; 5-a shell; 5-1-flank; 6-explosion-proof valve; 7-positive cover plate; 8-negative pole apron.
Detailed Description
The following further describes embodiments of the present invention with reference to the drawings. It should be noted that the description of the embodiments is provided to help understanding of the present invention, but the present invention is not limited thereto. In addition, the technical features involved in the embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
As shown in fig. 1 to 5, the utility model provides a square-shell battery cell, which includes a bare cell 1, a casing 5, an anode cover plate 7 and a cathode cover plate 8, wherein the bare cell 1 is installed inside the casing 5, an anode tab 2 and a cathode tab 3 of the bare cell 1 respectively extend out of two ends of the casing 5 to be fixedly connected with posts on the anode cover plate 7 and the cathode cover plate 8, and an integrated explosion-proof valve 6 is arranged on a side surface of the casing 5. The explosion-proof valve 6 is arranged on the side face of the shell 5, the direction of a spray valve for releasing pressure of the battery cell is changed, the pressure releasing direction is enabled to avoid a passenger compartment above the battery pack, and the safety performance is improved.
In the above scheme, the housing 5 is a square column structure with two ends penetrating through, the thicknesses of four side surfaces are the same or the thicknesses of two opposite side surfaces are the same, and the explosion-proof valve 6 is arranged on any one side surface of the housing 5. A portion on one side of the housing 5 is formed by punching a recess, which forms the explosion-proof valve 6.
In the scheme, the thickness of the explosion-proof valve 6 is smaller than that of the side surface 5-1 of the shell 5 where the explosion-proof valve is located. The thickness of the specific explosion-proof valve 6 is 0.1-0.95 times, preferably 0.3 times or 0.5 times of the thickness of the shell side 5-1 on which the valve is arranged.
In the scheme, the area of the explosion-proof valve 6 is 2-10 times of the capacity value of the battery core. When the capacity of the battery cell is C (mAh), the area of the explosion-proof valve is 2C-10C (mm)2). The area of the proper explosion-proof valve 6 can ensure the strength of the shell 5, and can also be broken and decompressed in time when the electric core is out of control due to heat, so that the safety of the electric core is improved.
In the above scheme, the battery cell 1 may be a winding battery cell or a laminated battery cell, and the surface of the battery cell is completely covered with the insulating film 4, so that the battery cell is insulated from the casing. The thickness of the insulating film 4 is 0.02 to 2mm, preferably 0.05mm, 0.1mm, 0.3mm, 0.5mm, 0.8mm, 1.0mm, or 1.5 mm. The insulating film is preferably a pp insulating film, a PI insulating film, or a PET insulating film.
In the scheme, the positive electrode lug 2 and the negative electrode lug 3 respectively comprise a plurality of layers of lug single sheets, and the plurality of layers of lug single sheets form an integral plane structure through welding.
The manufacturing method comprises the steps of manufacturing a shell 5 of the square-shell battery cell by extruding an aluminum alloy section, then punching nicks on the side face of the shell 5, and manufacturing the battery cell explosion-proof valve 6 by adjusting the area and the depth of the nicks, wherein the range of the explosion pressure of the explosion-proof valve 6 is adjustable within the range of 0.2-3 Mpa.
And then, fully coating the wound or laminated bare cell 1 with a pp insulating film or a PI insulating film or a PET insulating film by adopting a thermoplastic coating process to obtain the film-coated bare cell, and only reserving a positive electrode tab 2 and a negative electrode tab 3 for cell assembly, wherein the thickness of the pp insulating film or the PI insulating film or the PET insulating film is 0.02-2 mm.
Then, the positive pole lug 2 and the negative pole lug 3 of the bare cell are respectively connected to the positive pole cover plate 7 and the negative pole cover plate 8 of the square-shell cell through ultrasonic welding and laser welding processes, the multilayer pole lug single sheet of the negative pole lug is subjected to ultrasonic flat welding, and then the multilayer pole lug single sheet is welded on the back surface 8-1 of the pole of the negative pole cover plate 8 through laser to form an electric connection channel.
And then assembling the welded negative electrode cover plate 8 and the naked battery cell after film coating into the shell, welding the positive electrode lug 2 of the naked battery cell and the reverse side of the pole of the positive electrode cover plate 7, and finally performing laser side welding on the negative electrode cover plate 8, the positive electrode cover plate 7 and the shell 5 to complete the assembly of the shell battery cell.
The above description is only an embodiment of the present invention, but the scope of the present invention is not limited thereto, and any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope of the present invention are included in the scope of the present invention. Those not described in detail in this specification are within the skill of the art.
Claims (10)
1. The utility model provides a square-shell battery cell which characterized in that: including naked electric core (1), casing (5), anodal apron (7) and negative pole apron (8), naked electric core is installed inside the casing, and casing (5) both ends and anodal apron (7) and negative pole apron (8) fixed connection are stretched out respectively to the anodal utmost point ear (2) and the negative pole utmost point ear (3) of naked electric core (1), the side of casing (5) is equipped with explosion-proof valve (6).
2. The square-shell battery cell of claim 1, wherein: the shell (5) is of a square column structure with two ends penetrating through, and the explosion-proof valve (6) is arranged on any one side face of the shell (5).
3. The square-shell battery cell of claim 1, wherein: the side surface of the shell (5) forms a concave part through stamping, and the concave part forms the explosion-proof valve (6).
4. The square-shell battery cell of claim 1, wherein: the thickness of the explosion-proof valve (6) is smaller than that of the side face of the shell (5).
5. The square-shell battery cell of claim 4, wherein: the thickness of the explosion-proof valve (6) is 0.1-0.95 times of the thickness of the side surface of the shell (5).
6. The square-shell battery cell of claim 1, wherein: the area of the explosion-proof valve (6) is 2-10 times of the capacity value of the battery cell (1).
7. The square-shell battery cell of claim 1, wherein: the surface of the naked electric core (1) is completely covered with an insulating film (4).
8. The square-shelled electrical core of claim 7, wherein: the insulating film (4) is a pp insulating film or a PI insulating film or a PET insulating film.
9. The square-shelled electrical core of claim 7, wherein: the thickness of the insulating film (4) is 0.02-2 mm.
10. The square-shell battery cell of claim 1, wherein: the positive pole lug (2) and the negative pole lug (3) both comprise multilayer lug single sheets, and the multilayer lug single sheets form an integral plane structure through welding.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220391657.5U CN216818546U (en) | 2022-02-25 | 2022-02-25 | Square shell battery cell |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220391657.5U CN216818546U (en) | 2022-02-25 | 2022-02-25 | Square shell battery cell |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN216818546U true CN216818546U (en) | 2022-06-24 |
Family
ID=82044358
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220391657.5U Active CN216818546U (en) | 2022-02-25 | 2022-02-25 | Square shell battery cell |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN216818546U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN117117426A (en) * | 2023-09-27 | 2023-11-24 | 蜂巢能源科技股份有限公司 | Battery monomer and battery module |
| WO2024141038A1 (en) * | 2022-12-29 | 2024-07-04 | 蜂巢能源科技股份有限公司 | Battery, battery module and power device |
| WO2024159758A1 (en) * | 2023-01-31 | 2024-08-08 | 比亚迪股份有限公司 | Battery, battery pack, and vehicle |
| WO2025218504A1 (en) * | 2024-04-15 | 2025-10-23 | 比亚迪股份有限公司 | Battery, battery pack and electrical device |
-
2022
- 2022-02-25 CN CN202220391657.5U patent/CN216818546U/en active Active
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2024141038A1 (en) * | 2022-12-29 | 2024-07-04 | 蜂巢能源科技股份有限公司 | Battery, battery module and power device |
| WO2024159758A1 (en) * | 2023-01-31 | 2024-08-08 | 比亚迪股份有限公司 | Battery, battery pack, and vehicle |
| CN117117426A (en) * | 2023-09-27 | 2023-11-24 | 蜂巢能源科技股份有限公司 | Battery monomer and battery module |
| WO2025218504A1 (en) * | 2024-04-15 | 2025-10-23 | 比亚迪股份有限公司 | Battery, battery pack and electrical device |
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