CN218849711U - Electrode assembly and battery - Google Patents
Electrode assembly and battery Download PDFInfo
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- CN218849711U CN218849711U CN202320028439.XU CN202320028439U CN218849711U CN 218849711 U CN218849711 U CN 218849711U CN 202320028439 U CN202320028439 U CN 202320028439U CN 218849711 U CN218849711 U CN 218849711U
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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 utility model provides an electrode subassembly and battery. The utility model discloses an aspect provides an electrode subassembly, including first pole piece, diaphragm and second pole piece, wherein, be provided with first glue film on the diaphragm, be provided with the second glue film on first pole piece and/or the second pole piece, through first glue film and second glue film, the protective action of diaphragm to the pole piece has been strengthened, run into when the battery and fall, the striking, the puncture, when special cases such as external force extrusion, avoid sliding each other between pole piece and the diaphragm, dislocation and the emergence of rolling over a scheduling problem, reduce the contact risk of positive pole piece and negative pole piece, avoid the inside short circuit that takes place of battery, the problem of thermal runaway and the burning of starting a fire, improve the security performance of battery.
Description
Technical Field
The utility model relates to an electrode subassembly and battery relates to battery technical field.
Background
The battery is a device capable of converting chemical energy into electric energy, and has been widely applied to various fields such as electronic equipment, electric tools, electric automobiles and the like, and along with the increasingly complex and changeable application scenes of the battery, users also put forward higher requirements on the use reliability of the battery.
In the actual use process, when the battery meets special conditions such as falling, impact, puncture and external force extrusion, the structure of the battery is easy to damage, short circuit and thermal runaway occur in the battery, even the battery is subjected to fire explosion and the like, and the use reliability of the battery is seriously influenced. Therefore, how to improve the safety performance of the battery is a focus of continuous attention of those skilled in the art.
SUMMERY OF THE UTILITY MODEL
The utility model provides an electrode component for improve the security of battery.
The utility model provides a battery, it includes above-mentioned electrode subassembly.
A first aspect of the present invention provides an electrode assembly, which includes a first electrode plate, a second electrode plate, and a diaphragm, wherein the diaphragm includes a substrate layer and a first adhesive layer located on at least one surface of the substrate layer;
the diaphragm comprises a first diaphragm and a second diaphragm, the first pole piece is positioned between the first diaphragm and the second diaphragm, the first diaphragm comprises a first area opposite to the first pole piece and a second area extending out of the first pole piece, the second diaphragm comprises a third area opposite to the first pole piece and a fourth area extending out of the first pole piece, and the second area and the fourth area are connected;
first pole piece includes the first mass flow body and first active substance layer, the second pole piece includes the second mass flow body and second active substance layer, the both sides on first active substance layer and/or second active substance layer are provided with the second glue film, the second glue film with the diaphragm is connected.
In one embodiment, the adhesion between the second active material layer and the separator is F1, the adhesion between the second region and the fourth region is F2, and F2/F1 is 1.2 ≦ 20.
In one embodiment, 2N/m.ltoreq.F 1.ltoreq.500N/m, 5N/m.ltoreq.F 2.ltoreq.500N/m.
In a specific embodiment, the length of the connecting region formed by connecting the second region and the fourth region is 0.5-5mm.
In one embodiment, the adhesion between the separator and the second adhesive layer is F3, the adhesion between the separator and the first active material layer is F4, and F3/F4 is 1.2 ≦ 20.
In one embodiment, 5N/m.ltoreq.F 3.ltoreq.500N/m, 2N/m.ltoreq.F 4.ltoreq.500N/m.
In one embodiment, the length of the connecting region formed by connecting the second adhesive layer and the diaphragm is 0.5-5mm.
In a specific embodiment, the first pole piece is a positive pole piece, the second pole piece is a negative pole piece, and an end surface of the positive pole piece and at least one cross section of the diaphragm are located in the same plane.
In a specific embodiment, the positive electrode plate includes the second glue layer, and an end face of the negative electrode plate is located in the same plane as at least one cross section or end face of the second glue layer.
A second aspect of the present invention provides a battery including any of the above electrode assemblies.
The utility model discloses an implement, have following advantage at least:
1. the utility model provides an electrode subassembly can strengthen the guard action of diaphragm to the pole piece, when the battery meets special circumstances such as fall, striking, puncture, external force extrusion, avoids sliding each other between pole piece and the diaphragm, misplaces and turns over the emergence of rolling over the scheduling problem, reduces the contact risk of positive pole piece and negative pole piece, avoids the problem that battery inside takes place short circuit, thermal runaway and the burning of starting a fire, improves the security performance of battery.
2. The utility model provides a battery includes above-mentioned electrode subassembly, has better security performance.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of an electrode assembly according to an embodiment of the present invention;
fig. 2 is a schematic structural view of an electrode assembly according to another embodiment of the present invention;
fig. 3 is a schematic structural view of an electrode assembly according to still another embodiment of the present invention;
fig. 4 is a top view of a second adhesive layer according to an embodiment of the present invention;
fig. 5 is a top view of a second adhesive layer according to another embodiment of the present invention.
Description of reference numerals:
101-a positive current collector;
102-a positive electrode active material layer;
201-negative current collector;
202 — anode active material layer;
301-a first membrane;
301 a-a first region;
301 b-a second region;
302-a second membrane;
302 a-a third region;
302 b-a fourth region;
303-a substrate layer;
304-a first glue layer;
400-second glue layer.
Detailed Description
To make the objects, technical solutions and advantages of the present invention clearer, embodiments of the present invention are combined to clearly and completely describe the technical solutions in the embodiments of the present invention, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.
The electrode assembly comprises a positive pole piece, a diaphragm and a negative pole piece, which are important components of the battery, wherein the positive pole piece and the negative pole piece are subjected to electrochemical reaction to provide energy for the battery, and the diaphragm is positioned between the positive pole piece and the negative pole piece and is used for preventing the positive pole piece and the negative pole piece from contacting to cause short circuit of the battery. When the battery is subjected to special conditions such as falling, impact, puncture and external force extrusion, the positive pole piece, the negative pole piece and the diaphragm can slide and dislocate with each other due to uneven stress, even the diaphragm turns over and rolls over and the like, so that the diaphragm fails, the positive pole piece and the negative pole piece are contacted, the battery short circuit is caused, and further the thermal runaway of the battery is caused, and the safety of the battery is influenced.
In order to improve the security of battery, the utility model discloses the first aspect provides an electrode subassembly, and it includes first pole piece, second pole piece and diaphragm, and the electric polarity of first pole piece and second pole piece is opposite, when first pole piece is positive pole piece promptly, and the second pole piece is negative pole piece, and when first pole piece was negative pole piece, the second pole piece was positive pole piece, for the convenience of explanation, the utility model discloses use first pole piece as positive pole piece, the second pole piece carries out follow-up explanation as the negative pole piece for the example.
Fig. 1 is a schematic structural diagram of an electrode assembly according to an embodiment of the present invention, as shown in fig. 1, the separator includes a first separator 301 and a second separator 302, the positive electrode plate is located between the first separator 301 and the second separator 302, the negative electrode plate is located on a side of the second separator 302 away from the positive electrode plate, the first separator 301 and the second separator 302 both include a substrate layer 303 and a first adhesive layer 304 disposed on a surface of the substrate layer 303, and the first adhesive layer 304 in the first separator 301 and the second separator 302 is located on a side of the substrate layer 303 close to the positive electrode plate, the first separator 301 includes a first region 301a opposite to the positive electrode plate and a second region 301b extending out of the positive electrode plate, the second separator 302 includes a third region 302a opposite to the positive electrode plate and a fourth region 302b extending out of the positive electrode plate, the first adhesive layer 304 in the second region 301b and the fourth region 302b are opposite and integrally connected, the first separator 301 and the second separator 302 form a bag structure, and wrap the positive electrode plate inside the bag.
Further, the second region 301b and the fourth region 302b are integrally connected by bonding.
Fig. 2 is a schematic structural diagram of an electrode assembly according to still another embodiment of the present invention, as shown in fig. 2, the first separator 301 and the second separator 302 both include a substrate layer 303 and a first glue layer 304, and different from fig. 1, the directions of the substrate layer 303 and the first glue layer 304 in the first separator 301 and the second separator 302 are the same, that is, the first glue layer 304 in the first separator 301 is located on a side close to the positive electrode plate, the first glue layer 304 in the second separator 302 is located on a side far from the positive electrode plate, the first separator 301 includes a second region 301b extending out of the positive electrode plate, the second separator 302 includes a fourth region 302b extending out of the positive electrode plate, and the first glue layer 304 in the second region 301b is connected to the substrate layer 303 in the fourth region 302 b.
Fig. 3 is a schematic structural diagram of an electrode assembly according to still another embodiment of the present invention, as shown in fig. 3, each of the first separator 301 and the second separator 302 includes a substrate layer 303 and first glue layers 304 disposed on the upper and lower surfaces of the substrate layer 303, the first separator 301 includes a first region 301a and a second region 301b extending out of the positive electrode plate, the second separator 302 includes a third region 302a extending out of a fourth region 302b extending out of the positive electrode plate, and the first glue layers 304 in the second region 301b and the fourth region 302b are connected.
In the above embodiment, the substrate layer 303 includes one or two of polypropylene (PP) and Polyethylene (PE), and the first adhesive layer 304 includes one or more of PVDF, polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polyacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, polyethylene propylene copolymer, cyanoethylpullan, cyanoethylcellulose, carboxymethylcellulose, and polypropylene-maleic anhydride, styrene-polyisoprene.
Further, the first glue layer 304 includes PVDF, and based on the difference in the adhesive properties of the aqueous PVDF and the oily PVDF, the oily PVDF may be coated on the second region 301b and the fourth region 302b, and the aqueous PVDF may be coated on the first region 301a and the third region 302a, which is helpful to improve the adhesive strength at the two ends of the diaphragm and prevent the diaphragm from turning over.
Continuing to refer to fig. 1, the positive electrode piece includes the positive current collector 101 and sets up the positive active material layer 102 on two surfaces about the positive current collector 101, the negative electrode piece includes the negative current collector 201 and sets up the negative active material layer 202 on the negative current collector 201 surface, along positive active material layer 102 length direction, the direction that the x axle shown in fig. 1 is located promptly, the both sides of positive active material layer 102 still are provided with second glue film 400, second glue film 400 can bond compound with the diaphragm, avoid taking place to slide between pole piece and the diaphragm, the problem of dislocation, improve the protective action of diaphragm to the pole piece.
Fig. 4 is a top view of the second glue layer provided by an embodiment of the present invention, as shown in fig. 4, that is, the positive electrode sheet includes the positive electrode current collector 101 and the positive electrode active material layer 102 and the second glue layer 400 disposed on the surface of the positive electrode current collector 101, and along the length direction of the positive electrode active material layer, the second glue layer 400 is disposed on two sides of the positive electrode active material layer 102.
Fig. 5 is a plan view of a second adhesive layer according to another embodiment of the present invention, as shown in fig. 5, the second adhesive layer 400 is disposed around the positive electrode active material layer 102, which is helpful for further improving the bonding effect between the positive electrode sheet and the separator.
In addition, the second glue layer 400 can be disposed on two sides or four sides of the negative electrode active material layer 202, and the structure thereof can refer to the positive electrode plate, but since the length of the positive electrode active material layer 102 is usually smaller than the length of the negative electrode active material layer 202, this is to prevent ions coming out of the positive electrode active material layer 102 from being unable to be completely embedded into the negative electrode active material layer 202, which causes surface ions coming out of the negative electrode plate, which affects the cycle performance and safety of the battery, in order to avoid the length of the negative electrode plate being too long, in a preferred embodiment, the second glue layer 400 is disposed on two sides or four sides of the positive electrode active material layer 102, i.e., the positive electrode plate includes the second glue layer 400, and the end surface of the negative electrode plate and at least one cross section or end surface of the second glue layer 400 are located in the same plane; that is, the length of the negative electrode plate is greater than the length of the positive electrode active material layer 102, but not greater than the length of the positive electrode plate, and the orthographic projection of the edge of the negative electrode plate on the positive electrode plate is located in the second glue layer 400 or is flush with the edge of the second glue layer 400.
The second adhesive layer 400 includes an insulating material capable of blocking ion diffusion and electron diffusion of the positive electrode active material layer 102 near the edge of the second adhesive layer 400, and a binder for adhering the insulating material to the positive electrode current collector while achieving an adhesive effect between the second adhesive layer 400 and the separator, specifically, the insulating material is selected from one or more of boehmite, alumina, aluminum hydroxide, silica, and calcium oxide, and the binder is selected from one or more of PVDF, polyvinylidene fluoride-co-hexafluoropropylene, polyvinylidene fluoride-co-trichloroethylene, polyacrylate, polyacrylonitrile, polyvinylpyrrolidone, polyvinyl acetate, polyethylene-co-vinyl acetate, polyethylene oxide, polyarylate, cellulose acetate, polyethylene propylene copolymer, cyanoethylpullan, cyanoethylcellulose, carboxymethyl cellulose, and polypropylene-maleic anhydride, and styrene-polyisoprene.
In the above embodiment, the length L1 of the joint region formed by joining the second region 301b and the fourth region 302b is 0.5 to 5mm, and the length L2 of the joint region formed by joining the second adhesive layer 400 and the separator is 0.5 to 5mm.
Since the types of the binders in the positive electrode active material layer 102 and the first adhesive layer 304 are the same, the bonding strength between the positive electrode active material layer and the first adhesive layer is relatively high, and the bonding strength between the negative electrode active material layer 202 and the separator is relatively weak, and the negative electrode active material layer is easily peeled off from the surface of the separator, the present invention defines the bonding force between the negative electrode active material layer and the separator, specifically, taking the structure shown in fig. 1 as an example, the bonding force between the negative electrode active material layer 202 and the second separator 302 is F1, the bonding force between the second region 301b and the fourth region 302b is F2, and F2/F1 is not less than 1.2 and not more than 20.
Furthermore, F1 is more than or equal to 2N/m and less than or equal to 500N/m, and F2 is more than or equal to 5N/m and less than or equal to 500N/m.
The adhesion between the separator and the second adhesive layer 400 is F3, the adhesion between the separator and the positive electrode active material layer 102 is F4, and F3/F4 is 1.2 or more and 20 or less.
Further, F3 is more than or equal to 5N/m and less than or equal to 500N/m, and F4 is more than or equal to 2N/m and less than or equal to 500N/m.
The adhesive force can be obtained by testing through a common tensile testing machine, the sensor adopts a Transcell BAB-5MT model, a sample to be tested is cut and prepared, and then the sample is placed on the tensile testing machine, and the testing speed is 200mm/min.
The electrode assembly provided in the above example can be prepared by the following preparation method: preparing positive active substance layer slurry and second adhesive layer slurry, and coating the positive active substance layer slurry and the second adhesive layer slurry on the surface of a positive current collector to obtain a positive pole piece; preparing negative active material layer slurry, and coating the negative active material layer slurry on the surface of a negative current collector to obtain a negative pole piece; preparing second glue layer slurry, coating the second glue layer slurry on at least one surface of the base material layer to obtain a diaphragm, sequentially stacking and assembling the positive pole piece, the diaphragm and the negative pole piece through a lamination process, and bonding and compounding the second glue layer, the diaphragm and the second area and the fourth area in the diaphragm through conventional processes such as hot pressing, rolling, heat sealing and the like to obtain the electrode assembly.
It can be understood that the structure provided by the utility model also can be used for the coiled battery, be about to positive pole piece, diaphragm and negative pole piece range upon range of in proper order and coiling shaping obtain electrode subassembly, specifically can go on according to the conventional technical means in this field.
To sum up, the utility model provides an electrode subassembly through setting up first glue film and second glue film, can strengthen the guard action of diaphragm to the pole piece, when the battery meets special circumstances such as fall, striking, puncture, external force extrusion, avoids sliding each other between pole piece and the diaphragm, dislocation and the emergence of rolling over the scheduling problem, reduces the contact risk of positive pole piece and negative pole piece, avoids the inside problem that takes place short circuit, thermal runaway and the burning of starting a fire of battery, improves the security performance of battery.
The utility model discloses the second aspect still provides a battery, the battery includes above-mentioned arbitrary electrode subassembly.
Will the utility model discloses the electrode subassembly that the first aspect provided seals in battery case and pours into electrolyte into, can obtain the battery after the conventional processes such as formation. The utility model provides a battery includes above-mentioned electrode subassembly, therefore has better security performance.
The following detailed description is given in conjunction with specific examples:
comparative example 1
The electrode assembly provided by the comparative example comprises a positive electrode plate, a diaphragm and a negative electrode plate which are sequentially laminated, wherein the positive electrode plate comprises a positive current collector aluminum foil and positive active material layers arranged on the upper surface and the lower surface of the positive current collector aluminum foil; the negative pole piece comprises a negative current collector copper foil and negative active material layers arranged on the upper surface and the lower surface of the negative current collector; the diaphragm comprises a base material layer and first glue layers arranged on the upper surface and the lower surface of the base material layer, the base material layer comprises PP, and the first glue layers comprise water system PVDF.
The method for preparing the electrode assembly provided by the present comparative example includes the steps of:
preparing a positive pole piece, a diaphragm and a negative pole piece, sequentially stacking the positive pole piece, the diaphragm and the negative pole piece, and compounding the stacked positive pole piece, diaphragm and negative pole piece through hot pressing to form an electrode assembly, wherein the hot pressing pressure is 1.0MPa, the temperature is 90 ℃, and the time is 1.0s.
Comparative example 2
The electrode assembly provided by the present comparative example can be referred to as comparative example 1, except that a partial region of the separator protrudes outside the positive electrode sheet, and the separator protruding the positive electrode sheet is adhesively connected to form a pouch structure to seal the positive electrode sheet in the pouch.
Comparative example 3
The electrode assembly provided by this comparative example may be referred to comparative example 1, except that the first gel layer in the separator includes oily PVDF.
Comparative example 4
Reference is made to comparative example 1 for the electrode assembly provided by this comparative example, except that the positive electrode sheet includes a positive current collector aluminum foil, and a positive active material layer and a second adhesive layer disposed on the upper and lower surfaces of the positive current collector, the second adhesive layer and the separator are bonded and connected, and the second adhesive layer includes PVDF and boehmite (mass ratio is 1.
Example 1
The electrode assembly provided in this example had the structure shown in fig. 3, i.e., the structure of the separator was referred to comparative example 2, the first adhesive layer included oil-based PVDF, and the structure of the positive electrode tab was referred to comparative example 4.
A common tensile testing machine (Transcell BAB-5MT for a sensor) is adopted to cut and sample a sample to be tested, the sample is placed on the tensile testing machine, the testing speed is 200mm/min, the adhesive force between the positive electrode and the diaphragm and the adhesive force between the negative electrode and the diaphragm are tested, and the results are shown in Table 1:
table 1 results of adhesion test of electrode assemblies provided in example 1 and comparative examples 1 to 4
The electrode assemblies provided in example 1 and comparative examples 1-4 were fabricated into cells, 12 cells per group, and a cell drop test was performed using extreme conditions, the test method including:
step 1, fully charging a battery at 0.2C;
step 2, freely dropping the full-charge battery from a height of 1.5m onto a marble (the thickness is more than or equal to 20 mm) surface, and respectively dropping for 1 time from positive and negative directions (6 directions) of X, Y and Z;
and 3, after the battery falls, if the battery has no obvious damage on appearance, and does not expand, leak, crack, ignite or explode, the battery is regarded as passing, and otherwise, the battery does not pass the drop test.
The one-time pass rate and the average number of drops until final failure were counted, and the test results are shown in table 2:
table 2 drop test results of the batteries provided in example 1 and comparative examples 1 to 4
| Group of | One-pass rate | Average number of falls |
| Comparative example 1 | 41.7％ | 5 |
| Comparative example 2 | 66.7％ | 19 |
| Comparative example 3 | 75.0％ | 21 |
| Comparative example 4 | 83.3％ | 24 |
| Example 1 | 100.0％ | 33 |
According to table 2, the once-through rate and the average number of falls of battery in embodiment 1 all are superior to comparative example 1-4, show, the utility model provides an electrode subassembly can strengthen the guard action of diaphragm to the pole piece, when the battery meets special circumstances such as falling, striking, puncture, external force extrusion, avoids sliding each other between pole piece and the diaphragm, misplaces and turns over the emergence of rolling over a scheduling problem, reduces the contact risk of positive pole piece and negative pole piece, avoids the inside problem that takes place short circuit, thermal runaway and the burning of starting a fire of battery, improves the security performance of battery.
In the description of the present invention, it is to be understood that the terms "inner", "upper", "lower", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus should not be construed as limiting the present invention.
The terms "first" and "second" in the description and claims of the present invention and in the description of the above-described figures are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are capable of operation in sequences other than those illustrated or otherwise described herein.
The above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications or substitutions do not depart from the scope of the invention in its corresponding aspects.
Claims (10)
1. An electrode assembly is characterized by comprising a first pole piece, a second pole piece and a diaphragm, wherein the diaphragm comprises a base material layer and a first adhesive layer positioned on at least one surface of the base material layer;
the diaphragm comprises a first diaphragm and a second diaphragm, the first pole piece is positioned between the first diaphragm and the second diaphragm, the first diaphragm comprises a first area opposite to the first pole piece and a second area extending out of the first pole piece, the second diaphragm comprises a third area opposite to the first pole piece and a fourth area extending out of the first pole piece, and the second area and the fourth area are connected;
first pole piece includes the first mass flow body and first active substance layer, the second pole piece includes the second mass flow body and second active substance layer, the both sides on first active substance layer and/or second active substance layer are provided with the second glue film, the second glue film with the diaphragm is connected.
2. The electrode assembly according to claim 1, wherein the adhesive force between the second active material layer and the separator is F1, the adhesive force between the second region and the fourth region is F2, and 1.2 ≦ F2/F1 ≦ 20.
3. The electrode assembly of claim 2, wherein 2N/m F1 is 500N/m,5N/m F2 is 500N/m.
4. The electrode assembly according to claim 1, wherein the length of the connection region formed by connecting the second region and the fourth region is 0.5 to 5mm.
5. The electrode assembly according to claim 1, wherein the adhesive force between the separator and the second adhesive layer is F3, and the adhesive force between the separator and the first active material layer is F4, and 1.2 ≦ F3/F4 ≦ 20.
6. The electrode assembly of claim 5, wherein 5N/m.ltoreq.F 3.ltoreq.500N/m, 2N/m.ltoreq.F 4.ltoreq.500N/m.
7. The electrode assembly of claim 1, wherein the length of the connection region formed by connecting the second adhesive layer and the separator is 0.5-5mm.
8. The electrode assembly of any of claims 1-7, wherein the first pole piece is a positive pole piece and the second pole piece is a negative pole piece, and wherein an end face of the positive pole piece is in the same plane as at least one cross-section of the separator.
9. The electrode assembly of claim 8, wherein the positive electrode sheet comprises the second glue layer, and an end face of the negative electrode sheet is in the same plane as at least one cross section or end face of the second glue layer.
10. A battery comprising the electrode assembly of any one of claims 1-9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320028439.XU CN218849711U (en) | 2023-01-03 | 2023-01-03 | Electrode assembly and battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320028439.XU CN218849711U (en) | 2023-01-03 | 2023-01-03 | Electrode assembly and battery |
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| CN218849711U true CN218849711U (en) | 2023-04-11 |
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