CN220652286U - Battery cell and battery thereof - Google Patents
Battery cell and battery thereof Download PDFInfo
- Publication number
- CN220652286U CN220652286U CN202322294360.4U CN202322294360U CN220652286U CN 220652286 U CN220652286 U CN 220652286U CN 202322294360 U CN202322294360 U CN 202322294360U CN 220652286 U CN220652286 U CN 220652286U
- Authority
- CN
- China
- Prior art keywords
- tabs
- plate
- cell
- protective film
- positive
- 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
- 229920000642 polymer Polymers 0.000 claims abstract description 51
- 239000012790 adhesive layer Substances 0.000 claims abstract description 28
- 230000001681 protective effect Effects 0.000 claims abstract description 28
- 239000010410 layer Substances 0.000 claims description 33
- 239000000463 material Substances 0.000 claims description 20
- 238000003466 welding Methods 0.000 claims description 12
- 239000011149 active material Substances 0.000 claims description 9
- -1 polypropylene Polymers 0.000 claims description 6
- XECAHXYUAAWDEL-UHFFFAOYSA-N acrylonitrile butadiene styrene Chemical compound C=CC=C.C=CC#N.C=CC1=CC=CC=C1 XECAHXYUAAWDEL-UHFFFAOYSA-N 0.000 claims description 5
- 229920000122 acrylonitrile butadiene styrene Polymers 0.000 claims description 5
- 239000004676 acrylonitrile butadiene styrene Substances 0.000 claims description 5
- 239000004952 Polyamide Substances 0.000 claims description 4
- 239000004698 Polyethylene Substances 0.000 claims description 4
- 239000004743 Polypropylene Substances 0.000 claims description 4
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 4
- 229910052782 aluminium Inorganic materials 0.000 claims description 4
- 239000002985 plastic film Substances 0.000 claims description 4
- 229920006255 plastic film Polymers 0.000 claims description 4
- 229920002647 polyamide Polymers 0.000 claims description 4
- 229920000573 polyethylene Polymers 0.000 claims description 4
- 229920001155 polypropylene Polymers 0.000 claims description 4
- 239000004793 Polystyrene Substances 0.000 claims description 3
- 229920002223 polystyrene Polymers 0.000 claims description 2
- 238000003475 lamination Methods 0.000 abstract description 3
- 230000005405 multipole Effects 0.000 abstract 1
- 239000003292 glue Substances 0.000 description 8
- 238000000034 method Methods 0.000 description 6
- 239000011888 foil Substances 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 238000005520 cutting process Methods 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000003792 electrolyte Substances 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 238000003860 storage Methods 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
- 238000004804 winding Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The utility model relates to the technical field of secondary batteries, in particular to a battery cell and a battery thereof. The battery cell comprises an outer protective film, a positive plate, a diaphragm and a negative plate; the positive plate, the diaphragm and the negative plate are alternately laminated and wound in the outer protective film. A plurality of first tabs are arranged on the positive plate and the negative plate, the first tabs of the positive plate are arranged in a stacked mode, the first tabs of the negative plate are arranged in a stacked mode, and polymer adhesive layers are arranged on the first tabs of the positive plate and the negative plate. The first tab at the outermost side is adhered to the outer protective film through the polymer adhesive layer; the first lugs of the negative electrode plates are bonded through a polymer adhesive layer, and the first lugs of the positive electrode plates are bonded through a polymer adhesive layer. The top space of the multi-pole lug and lamination structure battery core is further reduced, the space utilization rate of the battery core is improved, and the energy density of the battery core is improved.
Description
Technical Field
The utility model relates to the technical field of secondary batteries, in particular to a battery cell and a battery thereof.
Background
The secondary battery (Secondary battery), also called a rechargeable battery or a storage battery, is a battery that can be charged and discharged a plurality of times.
The positive plate, the negative plate and the diaphragm of the secondary battery are alternately stacked and wound, a plurality of lugs on the positive plate are stacked together, a plurality of lugs on the negative plate are also stacked together, and welding marks exist on the lugs. The stacking of the tabs and the existence of the welding marks can lead to overlarge top space of the battery core, the space utilization rate is low, the energy density is low, more electrolyte is piled up at the top, and the top interface of the winding core is easily affected to influence the electrochemical performance of the battery.
At present, the battery cell can carry out tab protection glue pasting and tab folding processes after tab welding processes, and the tab protection glue is used for preventing welding and printing from penetrating through an aluminum plastic film, and the purpose of the tab folding process is to reduce the top space. However, the thickness of the tab is high, the tab is easy to rebound, the top space of the battery core is still large after the battery core is processed by the process, and the problem of low space utilization rate and low energy density still exists.
Disclosure of Invention
The embodiment of the utility model aims to solve the technical problems of larger top space, low space utilization rate and low energy density of a battery cell in the prior art by providing the battery cell and the battery thereof.
The utility model discloses a battery cell, which comprises an outer protective film, a positive plate, a diaphragm and a negative plate; the positive plate, the diaphragm and the negative plate are alternately laminated and wound in the outer protective film;
a plurality of first tabs are arranged on the positive plate and the negative plate, the first tabs of the positive plate are arranged in a laminated manner, the first tabs of the negative plate are arranged in a laminated manner, and polymer adhesive layers are arranged on the first tabs of the positive plate and the negative plate;
the first tab at the outermost side is adhered to the outer protective film through the polymer adhesive layer; the first lugs of the negative electrode plates are bonded through a polymer adhesive layer, and the first lugs of the positive electrode plates are bonded through a polymer adhesive layer.
Optionally, the distance between the polymer adhesive layer and the active material layer on the corresponding negative electrode plate and positive electrode plate is 0.5-3 mm.
Optionally, the distance between the polymer adhesive layer and the active material layer on the corresponding negative electrode plate and positive electrode plate is 1mm.
Alternatively, the width of the polymer gel layer is 3 to 6mm in a direction parallel to the length direction of the positive electrode sheet or the negative electrode sheet.
Optionally, the thickness of the polymer gel layer is 0.03-0.2 mm.
Alternatively, the width of the polymer gel layer is 4mm. The thickness of the polymer gel layer was 0.1mm.
Optionally, the polymer gel layer is one of a polypropylene modified material, a polyethylene modified material, a polystyrene modified material, a polyamide modified material, and an acrylonitrile-butadiene-styrene copolymer material having tackiness.
Optionally, the battery cell further comprises two second tabs, one second tab is welded with all the first tabs on the positive plate, and the other second tab is welded with all the first tabs on the negative plate; the hardness of the second lug is greater than that of the first lug, and the welding position of the first lug and the second lug is outside the outer protective film.
Optionally, the outer protective film is an aluminum plastic film.
The utility model also discloses a battery, which comprises a shell and the battery cell, wherein the battery cell is arranged in the shell.
Compared with the prior art, the battery cell provided by the embodiment of the utility model has the beneficial effects that: according to the battery cell, the polymer adhesive layer is arranged on the first electrode lugs, the first electrode lugs are adhered to the outer protective film through the polymer adhesive layer, meanwhile, all the first electrode lugs on the positive electrode plate are adhered to each other, all the first electrode lugs on the negative electrode plate are adhered to each other, the battery cell is directly welded after being packaged, the procedures of folding the electrode lugs and attaching the electrode lug protective adhesive are not needed, the top of the battery cell is well adhered, gaps are not existed, the top space of the battery cell with a multi-electrode lug and lamination structure is further reduced, the space utilization rate of the battery cell is improved, and the energy density of the battery cell is improved.
Drawings
The technical scheme of the utility model will be further described in detail below with reference to the accompanying drawings and examples, wherein:
FIG. 1 is a schematic illustration of a pole piece coated polymer gel layer in accordance with an embodiment of the present utility model;
FIG. 2 is a schematic illustration of a first tab die cut from a pole piece according to an embodiment of the present utility model;
fig. 3 is a schematic view of an alternate stack arrangement of positive electrode sheets, separator sheets, and negative electrode sheets (omitting the first tab on the positive electrode sheet) according to an embodiment of the present utility model;
FIG. 4 is a schematic illustration of a cell package of an embodiment of the present utility model but without a second tab soldered;
fig. 5 is a schematic diagram of a cell according to an embodiment of the utility model.
The reference numerals in the drawings are as follows:
1. an outer protective film; 2. a positive plate; 3. a diaphragm; 4. a negative electrode sheet; 5. a first tab; 6. a polymer gel layer; 7. foil material; 8. an active material layer; 9. a second lug; 10. and (5) welding positions.
Detailed Description
It should be noted that, in the case of no conflict, the embodiments and features in the embodiments may be combined with each other. Preferred embodiments of the present utility model will now be described in detail with reference to the accompanying drawings.
The embodiment of the utility model provides a battery cell, which is shown in fig. 3 and 5, and comprises an outer protective film 1, a positive plate 2, a diaphragm 3 and a negative plate 4; the positive electrode sheet 2, the separator 3 and the negative electrode sheet 4 are alternately laminated and wound in the outer protective film 1. A plurality of first tabs 5 are arranged on the positive plate 2 and the negative plate 4, the first tabs 5 of the positive plate 2 are stacked, the first tabs 5 of the negative plate 4 are stacked, and the first tabs 5 of the positive plate 2 and the negative plate 4 are provided with polymer adhesive layers 6.
The first tab 5 at the outermost side is adhered to the outer protective film 1 through the polymer adhesive layer 6; the first lugs 5 of the negative electrode plates 4 are bonded through the polymer adhesive layer 6, and the first lugs 5 of the positive electrode plates 2 are bonded through the polymer adhesive layer 6.
According to the battery cell, the polymer adhesive layer 6 is arranged on the first electrode lug 5, the first electrode lug 5 and the outer protective film 1 are adhered together through the polymer adhesive layer 6, meanwhile, all the first electrode lugs 5 on the positive electrode plate 2 are adhered together, all the first electrode lugs 5 on the negative electrode plate 4 are adhered together, the battery cell is directly welded after being packaged, the procedures of folding the electrode lugs and attaching the electrode lug protective adhesive are not needed, the top of the battery cell is well adhered, gaps do not exist, the top space of the battery cell with a multi-electrode lug and lamination structure is further reduced, the space utilization rate of the battery cell is improved, and the energy density of the battery cell is improved. At the same time, the polymer adhesive layer 6 does not affect the performance of the battery.
Specifically, as shown in fig. 1, when the battery cell pole piece is produced, a movable material layer is coated on the middle area of a foil 7, two sides are left for subsequent die cutting to form pole lugs, and polymer glue is coated in the direction parallel to the length direction of the movable material layer (namely, the direction of the length direction of the positive pole piece 2 or the negative pole piece 4 after subsequent cutting). As shown in fig. 2, the first tab 5 is die-cut at the foil 7 left at both sides, and is cut into the positive electrode sheet 2 and the negative electrode sheet 4 along the length direction of the movable material layer (i.e., along the transverse line in the middle position of fig. 2). As shown in fig. 3 (the first tabs 5 on the positive plate 2 are omitted), after the positive plate 2, the separator 3 and the negative plate 4 are alternately laminated and wound, the first tabs 5 on the positive plate 2 are laminated together, the first tabs 5 on the negative plate 4 are laminated together and are adhered to the outer protective film 1 through the polymer adhesive layer 6, the first tabs 5 on the positive plate 2 are adhered to each other, the first tabs 5 on the negative plate 4 are adhered to each other, and the first tabs 5 are packaged on the outer protective film 1, and then the first tabs 5 are partially exposed outside the outer protective film 1 so as to be convenient for welding with the subsequent second tabs 9. After welding with the second tab 9, as shown in fig. 5.
Specifically, the polymer glue layer 6 is one of a Polypropylene (PP) modified material, a Polyethylene (PE) modified material, a Polystyrene (PS) modified material, a Polyamide (PA) modified material, and an acrylonitrile-butadiene-styrene copolymer (Acrylonitrile Butadiene Styrene, ABS) material having tackiness. These polymer modified materials can provide good adhesion, making the adhesion of the first tab 5 more stable. The outer protective film 1 may be an aluminum plastic film.
The distance between the polymer adhesive layer 6 and the active material layer 8 on the corresponding negative electrode sheet 4 and positive electrode sheet 2 is 0.5-3 mm. The polymer adhesive layer 6 is positioned at a position 0.5-3 mm away from the active material layer 8, so that the rebound after bonding between the tabs is smaller, and the bonding is firmer. Specifically, the distance between the polymer gel layer 6 and the active material layer 8 on the corresponding negative electrode sheet 4, positive electrode sheet 2 may be 0.5mm, 1mm, 1.5mm, 2mm, 2.5mm, 3mm. Preferably, the distance between the polymer adhesive layer 6 and the active material layer 8 on the corresponding negative electrode sheet 4 and positive electrode sheet 2 is 1mm. In the direction parallel to the length direction of the positive electrode sheet 2 or the negative electrode sheet 4, the width of the polymer adhesive layer 6 is 3-6 mm, so that the adhesion can be firmer. In particular, the width of the polymer glue layer 6 may be 3mm, 3.5mm, 4mm, 4.5mm, 5mm, 5.5mm, 6mm. Preferably, the width of the polymer glue layer 6 is 4mm. The thickness of the polymer glue layer 6 is 0.03-0.2 mm, so that the adhesion can be firmer. In particular, the thickness of the polymer glue layer 6 may be preferably 0.03mm, 0.05mm, 0.1mm, 0.15mm, 0.2mm. The thickness of the polymer gel layer 6 is 0.1mm.
As shown in fig. 5, the battery cell further includes two second tabs 9, wherein one second tab 9 is welded with all the first tabs 5 on the positive electrode plate 2, and the other second tab 9 is welded with all the first tabs 5 on the negative electrode plate 4; the hardness of the second tab 9 is greater than the hardness of the first tab 5. The second tab 9 can further extend the external length of the first tab 5, and meanwhile, the hardness of the second tab 9 is greater than that of the first tab 5, so that the subsequent welding assembly of the battery is facilitated. Specifically, the second tab 9 is welded on the first tab 5, the welding position 10 of the first tab 5 and the second tab 9 is outside the outer protective film 1, namely, when the outer protective film 1 is packaged, the outer protective film 1 does not need to package the welding position 10 of the first tab 5 and the second tab 9, the space at the top of the battery cell can be further optimized, and the space utilization rate is improved.
The utility model also discloses a battery, which comprises a shell and the battery cell, wherein the battery cell is arranged in the shell.
It should be understood that the foregoing embodiments are merely illustrative of the technical solutions of the present utility model, and not limiting thereof, and that modifications and equivalents of some of the technical features described in the foregoing embodiments may be made by those skilled in the art; all such modifications and substitutions are intended to be included within the scope of this disclosure as defined in the following claims.
Claims (10)
1. The battery cell is characterized by comprising an outer protective film, a positive plate, a diaphragm and a negative plate; the positive plate, the diaphragm and the negative plate are alternately laminated and then wound in the outer protective film;
the positive plate and the negative plate are provided with a plurality of first tabs, the first tabs of the positive plate are arranged in a stacked manner, the first tabs of the negative plate are arranged in a stacked manner, and the first tabs of the positive plate and the negative plate are provided with polymer adhesive layers;
the first tab at the outermost side is adhered to the outer protective film through the polymer adhesive layer; the first lugs of the negative plate are bonded through the polymer adhesive layer, and the first lugs of the positive plate are bonded through the polymer adhesive layer.
2. The cell of claim 1, wherein the distance between the polymer gel layer and the active material layer on the corresponding negative electrode sheet and positive electrode sheet is 0.5-3 mm.
3. The cell of claim 2, wherein the distance between the polymer gel layer and the active material layer on the corresponding negative electrode sheet and positive electrode sheet is 1mm.
4. The cell of claim 1, wherein the width of the polymer gel layer is 3 to 6mm in a direction parallel to the length direction of the positive electrode sheet or the negative electrode sheet.
5. The cell of claim 4, wherein the thickness of the polymer gel layer is 0.03-0.2 mm.
6. The cell of claim 5, wherein the width of the polymer gel layer is 4mm and the thickness of the polymer gel layer is 0.1mm.
7. The cell of claim 1, wherein the polymer gel layer is one of a polypropylene modified material, a polyethylene modified material, a polystyrene modified material, a polyamide modified material, and an acrylonitrile-butadiene-styrene copolymer material having tackiness.
8. The cell of any one of claims 1 to 7, further comprising two second tabs, one of which is welded to all of the first tabs on the positive plate and the other of which is welded to all of the first tabs on the negative plate; the hardness of the second lug is greater than that of the first lug, and the welding position of the first lug and the second lug is outside the outer protective film.
9. The cell of any one of claims 1 to 7, wherein the outer protective film is an aluminum plastic film.
10. A battery comprising a housing and a cell as claimed in any one of claims 1 to 9, the cell being mounted in the housing.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322294360.4U CN220652286U (en) | 2023-08-24 | 2023-08-24 | Battery cell and battery thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202322294360.4U CN220652286U (en) | 2023-08-24 | 2023-08-24 | Battery cell and battery thereof |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220652286U true CN220652286U (en) | 2024-03-22 |
Family
ID=90290198
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202322294360.4U Active CN220652286U (en) | 2023-08-24 | 2023-08-24 | Battery cell and battery thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220652286U (en) |
-
2023
- 2023-08-24 CN CN202322294360.4U patent/CN220652286U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |