CN214848938U - Battery cell structure and lithium battery - Google Patents
Battery cell structure and lithium battery Download PDFInfo
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- CN214848938U CN214848938U CN202121043302.9U CN202121043302U CN214848938U CN 214848938 U CN214848938 U CN 214848938U CN 202121043302 U CN202121043302 U CN 202121043302U CN 214848938 U CN214848938 U CN 214848938U
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- polyvinylidene fluoride
- cell structure
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 42
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 42
- 229920002981 polyvinylidene fluoride Polymers 0.000 claims abstract description 58
- 239000002033 PVDF binder Substances 0.000 claims abstract description 54
- 239000003792 electrolyte Substances 0.000 claims abstract description 33
- 239000000919 ceramic Substances 0.000 claims abstract description 32
- 239000000463 material Substances 0.000 claims abstract description 13
- 239000010410 layer Substances 0.000 claims description 131
- 239000002985 plastic film Substances 0.000 claims description 34
- 229920006255 plastic film Polymers 0.000 claims description 34
- 229910052782 aluminium Inorganic materials 0.000 claims description 26
- 239000000084 colloidal system Substances 0.000 claims description 22
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 20
- 239000000758 substrate Substances 0.000 claims description 14
- 239000011888 foil Substances 0.000 claims description 10
- -1 polyethylene Polymers 0.000 claims description 10
- 239000012790 adhesive layer Substances 0.000 claims description 7
- 239000011241 protective layer Substances 0.000 claims description 6
- 239000004698 Polyethylene Substances 0.000 claims description 5
- 239000004743 Polypropylene Substances 0.000 claims description 5
- 229920000573 polyethylene Polymers 0.000 claims description 5
- 229920001155 polypropylene Polymers 0.000 claims description 5
- 230000001681 protective effect Effects 0.000 claims 2
- 238000002360 preparation method Methods 0.000 abstract description 20
- 239000007788 liquid Substances 0.000 abstract description 11
- 230000014759 maintenance of location Effects 0.000 abstract description 8
- 230000015572 biosynthetic process Effects 0.000 description 19
- 239000000853 adhesive Substances 0.000 description 14
- 230000001070 adhesive effect Effects 0.000 description 14
- 238000004804 winding Methods 0.000 description 13
- 238000000034 method Methods 0.000 description 12
- 239000012528 membrane Substances 0.000 description 6
- 230000005611 electricity Effects 0.000 description 5
- 238000001179 sorption measurement Methods 0.000 description 4
- 238000007689 inspection Methods 0.000 description 3
- 238000009413 insulation Methods 0.000 description 3
- 230000002950 deficient Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000004806 packaging method and process Methods 0.000 description 2
- 238000000926 separation method Methods 0.000 description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 238000002955 isolation Methods 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 239000003960 organic solvent Substances 0.000 description 1
- 230000035699 permeability Effects 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 239000002699 waste material Substances 0.000 description 1
Images
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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
Abstract
The application provides a battery core structure and a lithium battery. The battery cell structure comprises a positive plate, a negative plate and a diaphragm. The positive plate is provided with a first adhesion surface. The negative plate is provided with a second adhesion surface. The diaphragm comprises a ceramic layer, a base material layer, a first polyvinylidene fluoride layer and a second polyvinylidene fluoride layer, the ceramic layer is connected with the base material layer, the first polyvinylidene fluoride layer is respectively connected with the ceramic layer and the first adhesion surface, and the second polyvinylidene fluoride layer is respectively connected with the base material layer and the second adhesion surface. The battery cell structure increases the hardness of the battery cell of the lithium battery, ensures the liquid retention amount of the electrolyte, and further improves the preparation efficiency of the lithium battery.
Description
Technical Field
The utility model relates to a battery technology field especially relates to an electricity core structure and lithium cell.
Background
The lithium cell is because of having higher security, specific capacity and self-discharge rate by wide application in each field, and then make the demand of lithium cell constantly increase, but because in lithium cell preparation process, the easy local softening of electricity core leads to electric core hardness not enough, in the in-process of carrying out the secondary formation, because the increase of temperature and pressure, the loss of the electrolyte in the electricity core that hardness is not enough increases, the guarantor's of electrolyte in the electricity core has been influenced, influence the cycle performance of lithium cell, make the diaphragm impale to take place little short circuit even, it is great to cause the secondary formation defective rate of electricity core, consequently before carrying out the secondary formation, need carry out artifical inspection to electric core and select, waste time and energy, lead to the preparation efficiency of lithium cell lower, lead to the lithium cell confession not to be satisfied.
SUMMERY OF THE UTILITY MODEL
The utility model aims at overcoming the weak point among the prior art, provide the hardness that can increase the electric core of lithium cell and can ensure the guarantor's liquid volume of electrolyte, and then improve the electric core structure and the lithium cell of the preparation efficiency of lithium cell.
The purpose of the utility model is realized through the following technical scheme:
a cell structure, comprising:
the positive plate is provided with a first adhesion surface;
the negative plate is provided with a second adhesion surface;
the diaphragm comprises a ceramic layer, a base material layer, a first polyvinylidene fluoride layer and a second polyvinylidene fluoride layer, the ceramic layer is connected with the base material layer, the first polyvinylidene fluoride layer is respectively connected with the ceramic layer and the first adhesion surface, and the second polyvinylidene fluoride layer is respectively connected with the base material layer and the second adhesion surface.
In one embodiment, the battery cell structure further comprises electrolyte and an aluminum-plastic film, the electrolyte is filled in the aluminum-plastic film, and the positive plate, the first polyvinylidene fluoride layer, the ceramic layer, the substrate layer, the second polyvinylidene fluoride layer and the negative plate are sequentially stacked and wound to be arranged in the aluminum-plastic film and soaked in the electrolyte.
In one embodiment, the cell structure further includes a positive tab and a negative tab, the positive tab is connected to the positive plate, the negative tab is connected to the negative plate, and a portion of the positive tab and a portion of the negative tab protrude from the aluminum-plastic film and are in insulation connection with the aluminum-plastic film.
In one embodiment, the battery cell structure further includes a positive tab colloid and a negative tab colloid, the positive tab colloid surrounds the periphery of the positive tab, the positive tab colloid is clamped between the positive tab and the aluminum-plastic film, the negative tab colloid surrounds the periphery of the negative tab, and the negative tab colloid is clamped between the negative tab and the aluminum-plastic film.
In one embodiment, the aluminum plastic film is provided with an unreeling cavity and an air bag cavity, the unreeling cavity is communicated with the air bag cavity, and the electrolyte, the positive plate, the first polyvinylidene fluoride layer, the ceramic layer, the base material layer, the second polyvinylidene fluoride layer and the negative plate are all arranged in the unreeling cavity.
In one embodiment, the volume ratio of the unreeling cavity to the air bag cavity is 0.2-0.25.
In one embodiment, the aluminum plastic film comprises a protective layer, an aluminum foil layer and an adhesive layer, wherein the protective layer is wrapped on the periphery of the aluminum foil layer, and the aluminum foil layer is sandwiched between the protective layer and the adhesive layer.
In one embodiment, the substrate layer is a polyethylene layer or a polypropylene layer.
In one embodiment, the thickness of the first polyvinylidene fluoride layer is 0.01 mm-0.5 mm.
In one embodiment, the thickness of the second polyvinylidene fluoride layer is 0.01 mm-0.5 mm.
A lithium battery comprises a protection plate and the battery cell structure of any one of the embodiments, wherein the protection plate is respectively connected with the positive electrode tab and the negative electrode tab.
Compared with the prior art, the utility model discloses at least, following advantage has:
in the structure of the battery core, the first polyvinylidene fluoride layer passing through the diaphragm is adhered to the first adhesive surface arranged on the positive plate in the one-time formation process, and the second polyvinylidene fluoride layer is adhered to the second adhesive surface arranged on the negative plate in the one-time formation process, so that the hardness of a winding core obtained after the positive plate, the diaphragm and the negative plate are sequentially wound is improved, the loosening of the winding core is reduced, the local softening of the battery core is effectively reduced, the loss increase of electrolyte in the battery core with insufficient hardness is effectively improved, the liquid retention amount of the electrolyte in the battery core is influenced, the cycle performance of the lithium battery is influenced, even the diaphragm punctures to generate micro short circuit, the secondary formation reject ratio of the battery core is larger, the battery core needs to be manually checked and selected, time and labor are wasted, and the preparation efficiency of the lithium battery is lower, the preparation efficiency of the lithium battery is effectively improved, the problem that the liquid retaining quantity of the electrolyte is insufficient is well solved due to the fact that the ceramic layer of the diaphragm has strong adsorption capacity on the electrolyte, and the ceramic layer, the first polyvinylidene fluoride layer and the second polyvinylidene fluoride layer are matched for use, so that the preparation efficiency of the lithium battery is effectively improved, and the quality of the battery core structure is also effectively improved.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are required to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention, and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic structural diagram of a battery cell according to an embodiment of the present invention;
fig. 2 is a partially enlarged view of the cell structure shown in fig. 1 at a;
fig. 3 is a partially enlarged view of the cell structure shown in fig. 1 at B;
fig. 4 is a schematic structural diagram of a lithium battery according to an embodiment of the present invention.
Detailed Description
In order to facilitate understanding of the present invention, the present invention will be described more fully hereinafter with reference to the accompanying drawings. The preferred embodiments of the present invention are shown in the drawings. The invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete.
It will be understood that when an element is referred to as being "secured to" 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. The terms "vertical," "horizontal," "left," "right," and the like as used herein are for illustrative purposes only and do not represent the only embodiments.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
The application provides a battery cell structure. The battery cell structure comprises a positive plate, a negative plate and a diaphragm. The positive plate is provided with a first adhesion surface. The negative plate is provided with a second adhesion surface. The diaphragm comprises a ceramic layer, a base material layer, a first polyvinylidene fluoride layer and a second polyvinylidene fluoride layer, the ceramic layer is connected with the base material layer, the first polyvinylidene fluoride layer is respectively connected with the ceramic layer and the first adhesion surface, and the second polyvinylidene fluoride layer is respectively connected with the base material layer and the second adhesion surface.
In the battery cell structure, the first polyvinylidene fluoride layer of the diaphragm is adhered to the first adhesion surface arranged on the positive plate in the one-time formation process, and the second polyvinylidene fluoride layer is adhered to the second adhesion surface arranged on the negative plate in the one-time formation process, so that the hardness of a winding core obtained after the positive plate, the diaphragm and the negative plate are sequentially wound is improved, the loosening of the winding core is reduced, the local softening of the battery cell is effectively reduced, the loss increase of electrolyte in the battery cell with insufficient hardness is effectively improved, the liquid retention amount of the electrolyte in the battery cell is influenced, the cycle performance of the lithium battery is influenced, even the diaphragm is punctured to generate micro short circuit, the secondary formation reject ratio of the battery cell is larger, the battery cell needs to be manually checked and selected, time and labor are wasted, and the preparation efficiency of the lithium battery is lower, namely, the preparation efficiency of the lithium battery is effectively improved, and because the ceramic layer of the diaphragm has stronger adsorption capacity to the electrolyte, the problem of insufficient liquid retention of the electrolyte is better solved, and the ceramic layer, the first polyvinylidene fluoride layer and the second polyvinylidene fluoride layer are matched for use, so that the preparation efficiency of the lithium battery is effectively improved, and the quality of the battery core structure is also effectively improved.
Referring to fig. 1 and fig. 2 together, in order to better understand the cell structure of the present application, the cell structure 10 of the present application is further explained below, and the cell structure 10 of an embodiment includes a positive electrode tab 100, a negative electrode tab 200, and a separator 300. The positive electrode sheet 100 is provided with a first adhesive surface 110. The negative electrode tab 200 is provided with a second adhesive surface 210. The separator 300 includes a ceramic layer 310, a substrate layer 320, a first polyvinylidene fluoride layer 330, and a second polyvinylidene fluoride layer 340, the ceramic layer 310 is connected to the substrate layer 320, the first polyvinylidene fluoride layer 330 is connected to the ceramic layer 310 and the first adhesive surface 110, respectively, and the second polyvinylidene fluoride layer 340 is connected to the substrate layer 320 and the second adhesive surface 210, respectively.
In the above-mentioned battery cell structure 10, the first pvdf layer 330 of the separator 300 is bonded to the first adhesive surface 110 disposed on the positive plate 100 in the one-step formation process, and the second pvdf layer 340 is bonded to the second adhesive surface 210 disposed on the negative plate 200 in the one-step formation process, so that the hardness of the winding core obtained after the positive plate 100, the separator 300, and the negative plate 200 are sequentially wound is improved, and the loosening of the winding core is reduced, thereby effectively reducing the local softening of the battery cell, effectively improving the loss increase of the electrolyte with insufficient hardness, affecting the liquid retention amount of the electrolyte in the battery cell, affecting the cycle performance of the lithium battery, and even causing the micro short circuit due to the piercing of the separator 300, causing the secondary formation defective rate of the battery cell to be larger, and further requiring manual inspection of the battery cell, which is time-consuming and labor consuming, and resulting in the problem of lower preparation efficiency of the lithium battery, the preparation efficiency of the lithium battery is effectively improved, the problem of insufficient liquid retention of the electrolyte is better solved due to the fact that the ceramic layer 310 of the diaphragm 300 has strong adsorption capacity on the electrolyte, and the ceramic layer 310, the first polyvinylidene fluoride layer 330 and the second polyvinylidene fluoride layer 340 are matched for use, so that the preparation efficiency of the lithium battery is effectively improved, and the quality of the battery cell structure 10 is also effectively improved.
Referring to fig. 1 and fig. 2, in one embodiment, the cell structure 10 further includes an electrolyte 400 and an aluminum-plastic film 500, the electrolyte 400 is filled in the aluminum-plastic film 500, and the positive electrode sheet 100, the first polyvinylidene fluoride layer 330, the ceramic layer 310, the substrate layer 320, the second polyvinylidene fluoride layer 340, and the negative electrode sheet 200 are sequentially stacked, wound, disposed in the aluminum-plastic film 500, and soaked in the electrolyte 400, so as to ensure the functional integrity of the cell structure 10.
Referring to fig. 1, in one embodiment, the cell structure 10 further includes a positive tab 600 and a negative tab 700, the positive tab 600 is connected to the positive plate 100, the negative tab 700 is connected to the negative plate 200, and a portion of the positive tab 600 and a portion of the negative tab 700 both protrude from the aluminum-plastic film 500 and are in insulation connection with the aluminum-plastic film 500, so as to ensure the functional integrity of the cell structure 10.
Referring to fig. 1, in one embodiment, the battery cell structure 10 further includes a positive tab colloid 800 and a negative tab colloid 900, the positive tab colloid 800 is disposed around the periphery of the positive tab 600, the positive tab colloid 800 is sandwiched between the positive tab 600 and the aluminum-plastic film 500, the negative tab colloid 900 is disposed around the periphery of the negative tab 700, and the negative tab colloid 900 is sandwiched between the negative tab 700 and the aluminum-plastic film 500. It can be understood that positive tab colloid 800 separates positive tab 600 and plastic-aluminum membrane 500, and make part positive tab colloid 800 salient in plastic-aluminum membrane 500, the separation of positive tab 600 and plastic-aluminum membrane 500 has been realized better, and then the probability that electric core structure 10 takes place the short circuit has been reduced better, negative tab colloid 900 separates negative tab 700 and plastic-aluminum membrane 500, and make part negative tab colloid 900 salient in plastic-aluminum membrane 500, the separation of negative tab 700 and plastic-aluminum membrane 500 has been realized better, and then the probability that electric core structure 10 takes place the short circuit has been reduced better, and then the safety in utilization of electric core structure 10 has been improved.
Referring to fig. 1 and fig. 2, in one embodiment, an unwinding chamber 510 and an air bag chamber 520 are formed on an aluminum-plastic film 500, the unwinding chamber 510 is communicated with the air bag chamber 520, and the electrolyte 400, the positive electrode sheet 100, the first pvdf layer 330, the ceramic layer 310, the substrate layer 320, the second pvdf layer 340, and the negative electrode sheet 200 are disposed in the unwinding chamber 510. It can be understood that, in the formation process, the temperature of the battery cell structure 10 is increased and the pressure is increased, so as to promote the generation of gas in the battery cell structure 10, wherein the gas includes organic solvent and can contain moisture, if the gas is accumulated at the positive plate 100, the diaphragm 300 and the negative plate 200, the winding strength of the winding core formed by winding the positive plate 100, the diaphragm 300 and the negative plate 200 is reduced, so that the winding core is loosened, and further the battery cell is locally softened, therefore, the unwinding cavity 510 and the air bag cavity 520 are arranged in the aluminum plastic film 500, and the gas generated in the battery cell formation process is transferred to the air bag cavity 520 by the increased pressure, so that the problem that the winding core is loosened, and the battery cell is locally softened is effectively solved, the preparation efficiency of the lithium battery is further improved, and the quality of the battery cell structure 10 is improved.
In one embodiment, the volume ratio of the unwinding cavity 510 to the air bag cavity 520 is 0.2-0.25, so that gas generated in the cell formation process is effectively transferred to the air bag cavity 520, the preparation efficiency of the lithium battery is further ensured, and the quality of the cell structure 10 is ensured.
Referring to fig. 1 and fig. 3, in one embodiment, the aluminum plastic film 500 includes a protection layer 530, an aluminum foil layer 540 and an adhesive layer 550, the protection layer 530 covers the aluminum foil layer 540, and the aluminum foil layer 540 is sandwiched between the protection layer 530 and the adhesive layer 550. It can be understood that the protection layer 530 of the aluminum plastic film 500 ensures that the aluminum foil layer 540 of the aluminum plastic film 500 is not easily damaged, and further ensures the isolation protection of the aluminum plastic film 500 to the winding core inside the cell structure 10, and the adhesive layer 550 of the aluminum plastic film 500 realizes the fast packaging of the aluminum plastic film 500, and ensures the packaging stability of the aluminum plastic film 500.
In one embodiment, substrate layer 320 is a polyethylene layer or a polypropylene layer. It can be understood that the polyethylene layer or the polypropylene layer has a certain pore size and porosity, and earns low resistance and ionic conductivity, and has better permeability for lithium ions, thereby improving the conductivity and the cycle performance of the cell structure 10, and the polyethylene layer or the polypropylene layer has better chemical stability and insulation, thereby ensuring the stability of the cell structure 10.
In one embodiment, the thickness of the first polyvinylidene fluoride layer is 0.01-0.5 mm, so that the bonding stability of the positive plate is ensured.
In one embodiment, the thickness of the second polyvinylidene fluoride layer 340 is 0.01mm to 0.5mm, so that the bonding stability of the positive electrode sheet 100 is ensured.
Referring to fig. 1, 2 and 4, the present application also provides a lithium battery. The lithium battery of an embodiment includes the protection plate 20 and the cell structure 10 of any of the above embodiments, the protection plate 20 is respectively connected to the positive tab 600 and the negative tab 700, and in this embodiment, the cell structure 10 includes the positive tab 100, the negative tab 200, and the separator 300. The positive electrode sheet 100 is provided with a first adhesive surface 110. The negative electrode tab 200 is provided with a second adhesive surface 210. The separator 300 includes a ceramic layer 310, a substrate layer 320, a first polyvinylidene fluoride layer 330, and a second polyvinylidene fluoride layer 340, the ceramic layer 310 is connected to the substrate layer 320, the first polyvinylidene fluoride layer 330 is connected to the ceramic layer 310 and the first adhesive surface 110, respectively, and the second polyvinylidene fluoride layer 340 is connected to the substrate layer 320 and the second adhesive surface 210, respectively.
In the lithium battery, the problem that the liquid retaining amount of the electrolyte 400 is insufficient is effectively solved by using the cell structure 10, the problem that the cell needs to be checked manually before secondary formation is carried out, time and labor are wasted, and the preparation efficiency of the lithium battery is low is solved, the preparation efficiency of the lithium battery is effectively improved, and the quality of the lithium battery is also effectively improved.
Compared with the prior art, the utility model discloses at least, following advantage has:
in the battery cell structure 10 of the present invention, the first polyvinylidene fluoride layer 330 of the diaphragm 300 is adhered to the first adhesive surface 110 of the positive plate 100 in the one-step formation process, and the second polyvinylidene fluoride layer 340 is adhered to the second adhesive surface 210 of the negative plate 200 in the one-step formation process, so as to improve the hardness of the roll core obtained by winding the positive plate 100, the diaphragm 300 and the negative plate 200 in sequence, and reduce the loosening of the roll core, thereby effectively reducing the local softening of the battery cell, effectively improving the loss increase of the electrolyte 400 in the battery cell with insufficient hardness, affecting the liquid retention amount of the electrolyte 400 in the battery cell, affecting the cycle performance of the lithium battery, even making the diaphragm 300 pierce to generate micro short circuit, causing the secondary formation reject ratio of the battery cell to be larger, further requiring manual inspection of the battery cell, taking time and labor, and causing the problem of lower preparation efficiency of the lithium battery, the preparation efficiency of the lithium battery is effectively improved, the problem of insufficient liquid retention of the electrolyte 400 is better solved due to the fact that the ceramic layer 310 of the diaphragm 300 has strong adsorption capacity on the electrolyte 400, and the ceramic layer 310, the first polyvinylidene fluoride layer 330 and the second polyvinylidene fluoride layer 340 are matched for use, so that the preparation efficiency of the lithium battery is effectively improved, and the quality of the battery cell structure 10 is also effectively improved.
The above examples only represent some embodiments of the present invention, and the description thereof is more specific and detailed, but not to be construed as limiting the scope of the present invention. It should be noted that, for those skilled in the art, without departing from the spirit of the present invention, several variations and modifications can be made, which are within the scope of the present invention. Therefore, the protection scope of the present invention should be subject to the appended claims.
Claims (10)
1. A cell structure, comprising:
the positive plate is provided with a first adhesion surface;
the negative plate is provided with a second adhesion surface;
the diaphragm comprises a ceramic layer, a base material layer, a first polyvinylidene fluoride layer and a second polyvinylidene fluoride layer, the ceramic layer is connected with the base material layer, the first polyvinylidene fluoride layer is respectively connected with the ceramic layer and the first adhesion surface, and the second polyvinylidene fluoride layer is respectively connected with the base material layer and the second adhesion surface.
2. The battery cell structure of claim 1, further comprising an electrolyte and an aluminum-plastic film, wherein the electrolyte is filled in the aluminum-plastic film, and the positive plate, the first polyvinylidene fluoride layer, the ceramic layer, the substrate layer, the second polyvinylidene fluoride layer and the negative plate are sequentially stacked, wound, disposed in the aluminum-plastic film and soaked in the electrolyte.
3. The cell structure of claim 2, further comprising a positive tab and a negative tab, wherein the positive tab is connected to the positive plate, the negative tab is connected to the negative plate, and a portion of the positive tab and a portion of the negative tab protrude from the aluminum-plastic film and are in insulating connection with the aluminum-plastic film.
4. The cell structure of claim 3, further comprising a positive tab colloid and a negative tab colloid, wherein the positive tab colloid is disposed around the periphery of the positive tab, the positive tab colloid is sandwiched between the positive tab and the aluminum-plastic film, the negative tab colloid is disposed around the periphery of the negative tab, and the negative tab colloid is sandwiched between the negative tab and the aluminum-plastic film.
5. The cell structure of claim 2, wherein the aluminum-plastic film is provided with an unwinding cavity and an air bag cavity, the unwinding cavity is communicated with the air bag cavity, and the electrolyte, the positive plate, the first polyvinylidene fluoride layer, the ceramic layer, the substrate layer, the second polyvinylidene fluoride layer and the negative plate are all disposed in the unwinding cavity.
6. The cell structure of claim 5, wherein the volume ratio of the unwinding cavity to the air bag cavity is 0.2-0.25.
7. The cell structure of claim 2, wherein the aluminum-plastic film comprises a protective layer, an aluminum foil layer, and an adhesive layer, the protective layer is wrapped around the aluminum foil layer, and the aluminum foil layer is sandwiched between the protective layer and the adhesive layer.
8. The cell structure of claim 1, wherein the substrate layer is a polyethylene layer or a polypropylene layer.
9. The cell structure according to any one of claims 1 to 8, wherein the first polyvinylidene fluoride layer has a thickness of 0.01mm to 0.5 mm;
the thickness of the second polyvinylidene fluoride layer is 0.01 mm-0.5 mm.
10. A lithium battery comprising a protective plate and the cell structure of claim 3 or 4, wherein the protective plate is connected to the positive tab and the negative tab, respectively.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121043302.9U CN214848938U (en) | 2021-05-14 | 2021-05-14 | Battery cell structure and lithium battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202121043302.9U CN214848938U (en) | 2021-05-14 | 2021-05-14 | Battery cell structure and lithium battery |
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| Publication Number | Publication Date |
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| CN214848938U true CN214848938U (en) | 2021-11-23 |
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| CN202121043302.9U Active CN214848938U (en) | 2021-05-14 | 2021-05-14 | Battery cell structure and lithium battery |
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| CN (1) | CN214848938U (en) |
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- 2021-05-14 CN CN202121043302.9U patent/CN214848938U/en active Active
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