CN114270621A - Electrochemical device and electronic apparatus - Google Patents
Electrochemical device and electronic apparatus Download PDFInfo
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- CN114270621A CN114270621A CN202180003657.1A CN202180003657A CN114270621A CN 114270621 A CN114270621 A CN 114270621A CN 202180003657 A CN202180003657 A CN 202180003657A CN 114270621 A CN114270621 A CN 114270621A
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- 239000000853 adhesive Substances 0.000 claims description 94
- 230000001070 adhesive effect Effects 0.000 claims description 94
- 239000000463 material Substances 0.000 claims description 46
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 18
- 229910052782 aluminium Inorganic materials 0.000 abstract description 18
- 239000011888 foil Substances 0.000 abstract description 18
- 238000000034 method Methods 0.000 abstract description 10
- 230000008569 process Effects 0.000 abstract description 10
- 238000012360 testing method Methods 0.000 description 19
- 238000013461 design Methods 0.000 description 18
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 12
- 229910001416 lithium ion Inorganic materials 0.000 description 12
- 239000002390 adhesive tape Substances 0.000 description 9
- 230000009471 action Effects 0.000 description 5
- 238000002474 experimental method Methods 0.000 description 3
- 238000012545 processing Methods 0.000 description 3
- 240000004282 Grewia occidentalis Species 0.000 description 2
- 230000007423 decrease Effects 0.000 description 2
- 238000004146 energy storage Methods 0.000 description 2
- 239000003292 glue Substances 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 239000000178 monomer Substances 0.000 description 2
- -1 polyethylene Polymers 0.000 description 2
- 239000004698 Polyethylene Substances 0.000 description 1
- 239000004743 Polypropylene Substances 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 238000013473 artificial intelligence Methods 0.000 description 1
- 230000003190 augmentative effect Effects 0.000 description 1
- 230000009172 bursting Effects 0.000 description 1
- 230000001413 cellular effect Effects 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 238000011982 device technology Methods 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 229920001155 polypropylene Polymers 0.000 description 1
- 239000000758 substrate Substances 0.000 description 1
- 229920005992 thermoplastic resin Polymers 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
- H01M50/233—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions
- H01M50/242—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by physical properties of casings or racks, e.g. dimensions adapted for protecting batteries against vibrations, collision impact or swelling
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/593—Spacers; Insulating plates
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
- H01M50/50—Current conducting connections for cells or batteries
- H01M50/572—Means for preventing undesired use or discharge
- H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
- H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
- H01M50/595—Tapes
Landscapes
- Chemical & Material Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Electrochemistry (AREA)
- General Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Electric Double-Layer Capacitors Or The Like (AREA)
- Sealing Battery Cases Or Jackets (AREA)
- Connection Of Batteries Or Terminals (AREA)
Abstract
The present application relates to an electrochemical device and an electronic apparatus, the electrochemical device including: the electrode assembly is at least partially positioned in the shell; the insulating tape is positioned between the shell and the electrode assembly and comprises a first surface bonded with the electrode assembly and a second surface bonded with the shell; the area of the first surface is larger than that of the second surface, the bonding strength of the second surface is P2, the first surface comprises a first region with the bonding strength of P1, and P1 < P2. Because the area of the first surface is larger than that of the second surface, the pressure applied to the first surface and the electrode assembly is reduced, the volume and the weight of the insulating tape are smaller on the premise of ensuring the connection reliability between the insulating tape and the shell, and the energy density of the electrochemical device is improved. When P1 < P2, the risk that the aluminum foil of the electrode assembly is torn by the insulating tape in the dropping process is reduced, the short circuit in the electrode assembly is prevented, and the service life and the reliability of the electrochemical device are improved.
Description
Technical Field
The present application relates to the field of energy storage device technologies, and in particular, to an electrochemical device and an electronic apparatus.
Background
With the development of electronic devices, batteries of the electronic devices are required to have larger capacity so as to meet the cruising requirement of the electronic devices. A battery for an electronic device generally includes a case that protects an electrode assembly and the electrode assembly located inside the case. The shell and the electrode assembly can be bonded through the insulating adhesive tape, when the electronic equipment falls, the insulating adhesive tape can tear the electrode assembly, so that the internal short circuit of the electrode assembly occurs, and when the insulating adhesive tape is poor in bonding, risks such as bursting of the top seal can occur, and the safety of the electronic equipment is affected.
Disclosure of Invention
The application provides an electrochemical device and electronic equipment, this electrochemical device can improve the reliability of being connected between electrode subassembly and the casing, reduces the risk that electrode subassembly's aluminium foil is torn, promotes anti falling ability to improve electrochemical device's energy density.
A first aspect of the present application provides an electrochemical device comprising: a case, an electrode assembly, and an insulating tape; at least a portion of the electrode assembly is located within the housing; the insulating tape is positioned between the shell and the electrode assembly and comprises a first surface bonded with the electrode assembly and a second surface bonded with the shell; the first surface comprises a first adhesive region and the second surface comprises a second adhesive region; wherein, the area A of the first bonding area and the area B of the second bonding area satisfy: B/A is more than or equal to 0.08 and less than or equal to 0.95, the bonding strength of the second bonding area is P2, the first bonding area comprises a first area with the bonding strength of P1, and P1 is more than or equal to 0.2 xP 2 and less than or equal to 0.9 xP 2.
In another possible design, 0.4 XP 2 ≦ P1 ≦ 0.9 XP 2.
In one possible embodiment, the first adhesive zone has a first outer edge and the second adhesive zone has a second outer edge; an orthographic projection of the second outer edge on the first surface is located within the first region.
In one possible design, the distance between the orthographic projection of the second outer edge on the first surface and the first outer edge is a, and the width of the first surface is W2, wherein, a is more than or equal to 0.05 xW 2 and less than or equal to 0.4 xW 2. In another possible design, 0.05 xW 2 ≦ a ≦ 0.35 xW 2.
In one possible design, the first adhesive area also comprises a second region with an adhesive strength P3, 0.2 XP 3P 1 0.9 XP 3. In another possible design, 0.3 XP 3 ≦ P1 ≦ 0.9 XP 3.
In one possible design, an orthographic projection of the second adhesive region on the first surface covers the second area.
In one possible design, the first region has a first inner edge at a distance b from the first outer edge, wherein 0.2 × b ≦ a ≦ 0.8 × b. In another possible design, 0.3 xb. ltoreq. a.ltoreq.0.7 xb.
In one possible design, 0.1 xW 2 ≦ b ≦ 0.45 xW 2. In another possible design, 0.1 xW 2 ≦ b ≦ 0.4 xW 2.
In one possible design, the second region has a third outer edge, which coincides with the first inner edge.
In one possible design, an orthographic projection of the geometric center of the second adhesive region on the first surface coincides with the geometric center of the first adhesive region.
In one possible design, the ratio of the distance extending from the geometric center of the first and second adhesive areas to the first outer edge and the distance extending to the second outer edge, respectively, in the same direction is the same.
In one possible design, the electrode assembly has a third surface adhered to the insulating tape, the third surface having a length of L1 and a width of W1; the first bonding region has a first axis, the third surface has a second axis, and the distance between the orthographic projection of the first axis on the third surface and the second axis is D, wherein D is less than or equal to 0.1 xL 1.
In one possible design, the first bonding region has a third axis and the third surface has a fourth axis along the length of the electrochemical device, the distance between the orthographic projection of the third axis on the third surface and the fourth axis is E, and E is less than or equal to 0.1 xW 1.
In one possible design, the first adhesive region has a length of L2 and a width of W2; wherein, L2 is more than or equal to 0.4 xL 1 and less than or equal to 0.8 xL 1, and W2 is more than or equal to 0.4 xW 1 and less than or equal to 0.8 xW 1.
In one possible design, the first adhesive area covers an orthographic projection of the second adhesive area on the third surface.
In a possible design, the insulating tape includes a first adhesive material, a base material, and a second adhesive material stacked in sequence, the first adhesive material is bonded to the electrode assembly, and the second adhesive material is bonded to the case.
A second aspect of the present application provides an electronic apparatus comprising the electrochemical device described above.
When the casing of the electrochemical device is subjected to an external force (for example, the casing is subjected to the external force in the process of a drop test), the external force can be transmitted to the second bonding area of the insulating tape from the casing, transmitted to the first bonding area from the second bonding area and transmitted to the electrode assembly from the first bonding area. Meanwhile, when the area of the second surface of the insulating tape connected with the housing is small, the volume and the weight of the insulating tape are small on the premise of ensuring the connection reliability between the insulating tape and the housing, so that the energy density of the electrochemical device is improved.
Meanwhile, when P1 < P2, the first bonding region includes a first region having a bonding strength smaller than that of the second bonding region, i.e., the bonding reliability between the first region and the electrode assembly is lower than that between the second bonding region and the case. When the shell of the electrochemical device is subjected to external force (for example, the shell is subjected to external force in the process of a drop test), the first region with smaller bonding strength P1 can be separated from the electrode assembly when the electrochemical device drops, so that the energy transmitted to the electrode assembly in the process of dropping can be absorbed, the risk that the aluminum foil of the electrode assembly is torn by the insulating tape in the process of dropping is further reduced, the short circuit in the electrode assembly is prevented, and the service life and the reliability of the electrochemical device are further improved.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application.
Drawings
Fig. 1 is a schematic view of a connection structure of a case, an electrode assembly, and an insulating tape according to a first embodiment of the present application;
FIG. 2 is a top view of the insulating tape of FIG. 1;
FIG. 3 is a schematic view of a connection structure of a case, an electrode assembly and an insulating tape according to a second embodiment of the present application;
FIG. 4 is a top view of the insulating tape of FIG. 3;
FIG. 5 is a top view of a third embodiment of the present application;
FIG. 6 is a schematic view showing a connection structure of a case, an electrode assembly and an insulating tape according to a fourth embodiment of the present application;
FIG. 7 is a schematic view showing a connection structure of a case, an electrode assembly and an insulating tape according to a fifth embodiment of the present application;
FIG. 8 is a schematic view showing a connection structure of a case, an electrode assembly and an insulating tape in a sixth embodiment of the present application;
FIG. 9 is a schematic view showing a connection structure of a case, an electrode assembly and an insulating tape in a seventh embodiment of the present application;
FIG. 10 is a side view of an electrochemical device provided in accordance with an embodiment of the present application;
fig. 11 is a schematic structural view of an electrochemical device according to another embodiment of the present disclosure.
Reference numerals:
1-a shell;
2-an electrode assembly;
21-a third surface;
211-second axis;
212-a fourth axis;
3-insulating tape;
31-a first adhesive region;
311-a first region;
311 a-first inner edge;
312 — a second region;
312 a-a third outer edge;
313-a first axis;
314-a third axis;
315 — a first outer edge;
316-gap;
32-a second adhesive region;
321-a second outer edge;
33-a first glue material;
34-a second glue material;
35-a substrate.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and together with the description, serve to explain the principles of the application.
Detailed Description
For better understanding of the technical solutions of the present application, the following detailed descriptions of the embodiments of the present application are provided with reference to the accompanying drawings.
It should be understood that the embodiments described are only a few embodiments of the present application, and not all embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The terminology used in the embodiments of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in the examples of this application and the appended claims, the singular forms "a", "an", and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
It should be noted that the terms "upper", "lower", "left", "right", and the like used in the embodiments of the present application are described in terms of the angles shown in the drawings, and should not be construed as limiting the embodiments of the present application. In addition, in this context, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on "or" under "the other element or be indirectly on" or "under" the other element via an intermediate element.
The embodiment of the application provides an electrochemical device, as shown in fig. 1 to 9, the electrochemical device includes a casing 1 and an electrode assembly 2, the casing 1 has a receiving cavity, at least a part of the electrode assembly 2 is located in the receiving cavity, and the casing 1 is used for protecting the electrode assembly 2. The electrode assembly 2 may include a first pole piece, a second pole piece, and a separator, among others. One of the first and second pole pieces is a positive electrode, the other is a negative electrode, and a separator for separating the first and second pole pieces may be supported by a thermoplastic resin, such as polyethylene or polypropylene, and the separator may be for insulating the first and second pole pieces.
When the electrochemical device is subjected to drop test, the risks of burst of the top seal, tearing of the aluminum foil of the electrode assembly 2 and the like are easy to occur, so that the electrode assembly 2 is short-circuited, and the electrochemical device is damaged. In order to solve the technical problem, as shown in fig. 1 to 9, the electrochemical device further includes an insulating tape 3, the insulating tape 3 is located between the housing 1 and the electrode assembly 2, the insulating tape 3 includes a first surface adhered to the electrode assembly 2 and a second surface adhered to the housing 1, the first surface includes a first adhesion region 31, and the second surface includes a second adhesion region 32, that is, the electrode assembly 2 is connected to the housing 1 through the insulating tape 3, so as to prevent the electrode assembly 2 from moving in the accommodating cavity of the housing 1 during the operation of the electrochemical device, and the insulating tape 3 can also prevent the electrode assembly 2 from being short-circuited with the housing 1, so that the electrochemical device can normally operate. Meanwhile, in the drop test process, there is also a risk that the insulating tape 3 tears the aluminum foil of the electrode assembly 2 under the action of external force.
In the present embodiment, as shown in fig. 1 to 9, the area of the first bonding region 31 is larger than that of the second bonding region 32, i.e. the area of the surface of the insulating tape 3 bonded to the case 1 is smaller than that of the surface bonded to the electrode assembly 2. Specifically, the area a of the first adhesion region 31 and the area B of the second adhesion region 32 satisfy: 0.08. ltoreq. B/A. ltoreq.0.95, and for example, B/A may be specifically 0.15, 0.3, 0.5, 0.7, 0.8 or the like.
When the housing 1 of the electrochemical device receives an external force (for example, the housing 1 receives an external force during a drop test), the external force can be transmitted from the housing 1 to the second bonding region 32 of the insulating tape 3, from the second bonding region 32 to the first bonding region 31, and from the first bonding region 31 to the electrode assembly 2, because the area of the first bonding region 31 is larger than that of the second bonding region 32, the peeling force received per unit area between the first bonding region 31 and the electrode assembly 2 can be reduced, the risk that the insulating tape 3 tears the aluminum foil of the electrode assembly 2 is reduced, the connection reliability between the electrode assembly 2 and the insulating tape 3 is improved, and the safety of the electrode assembly 2 is further improved. Meanwhile, when the area of the second adhesive region 32 of the insulating tape 3 connected to the case 1 is small, the volume and weight of the insulating tape 3 are also small on the premise of ensuring the connection reliability between the insulating tape 3 and the case 1, thereby contributing to the improvement of the energy density of the electrochemical device.
In this embodiment, when the B/a is too large (for example, greater than 0.95), it means that the area a of the first bonding region 31 is closer to the area B of the second bonding region 32, which results in that the peeling force per unit area between the edge of the first bonding region 31 and the electrode assembly 2 cannot be effectively reduced, and thus the risk that the insulating tape 3 tears the aluminum foil of the electrode assembly 2 is high, and the safety of the electrode assembly 2 is reduced; and causes the weight and volume of the insulating tape 3 to be excessive, reducing the energy density of the electrochemical device. When B/a is too small (for example, less than 0.08), that is, the area B of the second adhesive region 32 is too small, the peeling force per unit area between the insulating tape 3 and the housing 1 is large, and the connection reliability is lowered.
Meanwhile, the second adhesive region 32 has an adhesive strength of P2, and the first adhesive region 31 includes a first region 311 having an adhesive strength of P1, wherein P1 < P2.
Specifically, 0.2 XP 2 ≦ P1 ≦ 0.9 XP 2, and for example, P1 may specifically be 0.3 XP 2, 0.5 XP 2, 0.6 XP 2, 0.8 XP 2, 0.9 XP 2, or the like.
In this embodiment, when the ratio between P1 and P2 is too large, the bonding strength P1 of the first region 311 is similar to the bonding strength P2 of the second bonding region 32, and the bonding between the first region 311 and the electrode assembly 2 cannot be broken during the dropping of the electrochemical device, so that the tension transmitted from the insulating tape 3 to the electrode assembly 2 cannot be effectively absorbed, and the risk that the insulating tape 3 tears the aluminum foil of the electrode assembly 2 is high; when the ratio between P1 and P2 is too small, the bonding strength of the first region 311 is too small compared with the bonding strength P2 of the second bonding region 32, which may cause the disconnection between the first region 311 and the electrode assembly 2 by a small external force, affecting the lifespan and reliability of the electrochemical device. Therefore, when 0.2 XP 2 ≦ P1 ≦ 0.9 XP 2, the bonding strength P1 of the first region 311 and the bonding strength P2 of the second bonding region 32 are moderate, the connection reliability between the insulating tape 3 and the case 1 can be improved, and the risk of the insulating tape 3 tearing the aluminum foil of the electrode assembly 2 can be reduced.
The bonding strength of the insulating tape 3 is related to the quality, size and other factors of the electrochemical device, and it is required to meet the requirement that the insulating tape 3 does not move relative to the electrode assembly 2 in the dropping process of the electrochemical device, and the insulating tape 3 does not tear the aluminum foil of the electrode assembly 2. Typically, the bond strength P2 of the second bond region 32 ranges from 2MPa to 20 MPa.
Specifically, as shown in fig. 1 to 9, the first bonding area 31 has a first outer edge 315, the second bonding area 32 has a second outer edge 321, and an orthogonal projection of the second outer edge 321 on the first surface is located in the first region 311.
In this embodiment, when the orthographic projection of the second outer edge 321 on the first surface is located in the first region 311, the external force transmitted from the edge of the second bonding region 32 can be completely transmitted to the first region 311 through the insulating tape 3, and when the external force is too large, the bonding between the first region 311 and the electrode assembly 2 can be broken, so that the risk that the insulating tape 3 tears the aluminum foil of the electrode assembly 2 under the action of the external force is reduced, and the risk that the electrode assembly 2 is short-circuited is reduced.
More specifically, as shown in FIGS. 1-5, the distance between the orthographic projection of the second outer edge 321 on the first surface and the first outer edge 315 is a, and the width of the first adhesive region 31 is W2, wherein 0.05 XW 2 ≦ a ≦ 0.4 XW 2. I.e. the second outer edge 321 is offset from the first outer edge 315 in an orthogonal projection of the first surface. Among the four sides of the insulating tape 3, the offset may exist on one side (as shown in fig. 1 and 2), on the opposite side (as shown in fig. 3 and 4), or on all four sides (as shown in fig. 5).
In this embodiment, when a is too large, it means that the difference between the area B of the second bonding region 32 and the area a of the first bonding region 31 is too large, that is, the area B of the second bonding region 32 is too small compared to the area a of the first bonding region 31, that is, the area of the bonding surface between the insulating tape 3 and the housing 1 is too small, so that the peeling force acting on the unit area between the insulating tape 3 and the housing 1 is too large, and the connection reliability between the insulating tape 3 and the housing 1 is too small; when a is too small, it means that the difference between the area B of the second bonding region 32 and the area a of the first bonding region 31 is too small, that is, the area of the first bonding region 31 beyond the edge of the second bonding region 32 is too small, which results in too small an area of stress action transferred from the edge of the second bonding region 32 to the edge of the first bonding region, that is, too large a peeling force per unit area between the edge of the first bonding region 31 of the insulating tape 3 and the electrode assembly 2, thereby causing the insulating tape 3 to easily tear the aluminum foil of the electrode assembly 2, and also causing too large a volume of the insulating tape 3, which lowers the energy density of the electrochemical device. Therefore, when a is 0.05 XW 2 ≦ 0.4 XW 2, the areas of the first and second adhesive regions 31 and 32 are moderate, so that the insulating tape 3 has high connection reliability with both the case 1 and the electrode assembly 2 and the energy density of the electrochemical device can be improved.
A drop test was performed by taking a lithium ion battery with a rectangular maximum projection plane as an example, and a drop passage rate was compared, wherein the group 1 had a structure shown in fig. 1 and 2, and the above-described dislocation was present on one side of the insulating tape 3 in the width direction; the group 2 has the structure shown in fig. 3 and 4, and the above-described misalignment exists on both sides of the insulating tape 3 in the width direction; the groups 3 and 4 have the structure shown in fig. 5, in which the above-described misalignment exists all around the insulating tape 3; the first 31 and second 32 adhesive areas of the base group are identical in shape and size. Setting the repeated experiment times of the lithium ion battery at each position as 20 times, requiring that the passing rate is not less than 80% (namely at least 16 lithium ion batteries do not fail when falling) as qualified, and falling the working condition: group 1 was a single side drop, group 2 was two opposite side drops, and groups 3-4 and base were six-sided four-cornered. Wherein the electrode assembly 2 of the rectangular lithium ion battery selected had a length L1 of 87mm and a width W1 of 64mm, and the first adhesive region 31 had a length L2 of 60mm and a width W2 of 42 mm; the first adhesive area 31 of the insulating tape 3 in groups 1-4 has only the first region 311. The test results are shown in the following table:
from the test results in the table above, it can be seen that: the area A of the first bonding area and the area B of the second bonding area meet the following requirements: after the insulating adhesive tape 3 with B/A being more than or equal to 0.08 and less than or equal to 0.95 and P1 being more than or equal to 0.2 XP 2 and less than or equal to 0.9 XP 2, the electrochemical device has higher passing rate in a drop test, and when a is more than or equal to 0.05 XP 2 and less than or equal to 0.35 XP 2 and 0.4 XP 2 and less than or equal to P1 and less than or equal to 0.9 XP 2, the passing rate is higher (more than or equal to 90 percent).
In one embodiment, as shown in fig. 6-9, the first bonding region 31 includes a first region 311 and a second region 312, and the bonding strength of the first region 311 is P1 and the bonding strength of the second region 312 is P3, wherein P1 < P3.
When the case 1 of the electrochemical device is subjected to an external force (for example, the case 1 is subjected to the external force during a drop test), the external force can be transmitted from the case 1 to the second bonding region 32 of the insulating tape 3, from the second bonding region 32 to the first bonding region 31, and from the first bonding region 31 to the electrode assembly 2, because the first bonding region 31 has the first region 311 and the second region 312, the second region 312 with the higher bonding strength P3 can improve the connection reliability between the insulating tape 3 and the electrode assembly 2, thereby reducing the risk that the top seal is broken due to the electrode assembly 2 shifting when the electrochemical device is dropped, and improving the service life and reliability of the electrochemical device; the first region 311 with the smaller bonding strength P1 can be separated from the adhesion between the electrode assembly 2 when the electrochemical device falls, so that the energy transmitted to the electrode assembly 2 in the falling process can be absorbed, the risk that the aluminum foil of the electrode assembly 2 is torn by the insulating adhesive tape 3 in the falling process is reduced, the short circuit inside the electrode assembly 2 is prevented, and the service life and the reliability of the electrochemical device are further improved.
Specifically, 0.2 XP 3 ≦ P1 ≦ 0.9 XP 3, and P1 may specifically be 0.5 XP 3, 0.6 XP 3, 0.8 XP 3, 0.9 XP 3, or the like.
In the present embodiment, when the ratio between P1 and P3 is too large, the bonding strength P3 of the second region 312 is too small compared to the bonding strength P1 of the first region 311, resulting in low reliability of adhesion between the insulating tape 3 and the electrode assembly 2, and thus causing the electrode assembly 2 to rattle within the case 1. Therefore, when 0.2 XP 3 ≦ P1 ≦ 0.9 XP 3, the bonding strength P1 of the first region 311 and the bonding strength P3 of the second region 312 are moderate, the connection reliability between the insulating tape 3 and the electrode assembly 2 can be improved, and the risk of the insulating tape 3 tearing the aluminum foil of the electrode assembly 2 can be reduced.
The bonding strength of the insulating tape 3 is related to the quality, size and other factors of the electrochemical device, and it is required to meet the requirement that the insulating tape 3 does not move relative to the electrode assembly 2 in the dropping process of the electrochemical device, and the insulating tape 3 does not tear the aluminum foil of the electrode assembly 2. Typically, the bond strength P3 of the second region 312 ranges from 2MPa to 20 MPa.
In the insulating tape 3, the bonding strength P2 of the second bonding region 32 may be the same as or different from the bonding strength P3 of the second region 312 in the first bonding region 31, and there is no strict relationship between the two, as long as both are greater than the bonding strength P1 of the first region 311.
In one embodiment, the orthographic projection of the second bonding region 32 on the first surface covers the second area 312, as shown in FIGS. 6-9.
In one embodiment, as shown in FIGS. 6-9, the distance between the orthographic projection of the second outer edge 321 on the first surface and the first outer edge 315 is a, the first region 311 has a first inner edge 311a, and the distance between the first inner edge 311a and the first outer edge 315 is b, wherein 0.2 × b ≦ a ≦ 0.8 × b. For example, a may be specifically 0.3 × b, 0.4 × b, 0.5 × b, 0.6 × b, 0.7 × b, or the like.
In this embodiment, when the ratio of a to b is too small, the distance between the first outer edge 315 and the second outer edge 321 is too small, so that the area difference between the first bonding region 31 and the second bonding region 32 of the insulating tape 3 is small, and the volume and the weight of the insulating tape 3 cannot be effectively reduced, thereby reducing the energy density of the electrochemical device. When the ratio of a to b is too large, the external force acting on the edge of the second bonding region 32 cannot be well transmitted to the first region 311 of the first bonding region 31, and thus the bonding between the first region 311 and the electrode assembly 2 cannot be broken when the electrochemical device is subjected to the external force, and the external force cannot be effectively absorbed, so that the insulating tape 3 tears the aluminum foil of the electrode assembly 2. When 0.2 xb ≦ a ≦ 0.8 xb, the distance between the first outer edge 315 and the first inner edge 311a is moderate, enabling the energy density of the electrochemical device to be improved while preventing the insulating tape 3 from tearing the aluminum foil of the electrode assembly 2.
Taking a lithium ion battery with a rectangular maximum projection surface as an example, a drop test is carried out, and drop passing rates are compared, wherein the group 5 and the group 6 have the structures shown in fig. 6, and the dislocation exists around the insulating tape 3; the number of repeated experiments of the lithium ion batteries at each position is set to be 20, the passing rate is required to be not less than 80% (namely at least 16 lithium ion batteries do not fail when falling) to be qualified, and the falling working condition is six-sided and four-corner. Wherein the electrode assembly 2 of the rectangular lithium ion battery selected had a length L1 of 87mm and a width W1 of 64mm, and the first adhesive region 31 had a length L2 of 60mm and a width W2 of 42 mm. The test results are shown in the following table:
from the test results in the table above, it can be seen that: after the insulating adhesive tape 3 with a being more than or equal to 0.2 × b and less than or equal to 0.8 × b and P1 being more than or equal to 0.2 × P3 and less than or equal to 0.9 × P3 is arranged, the electrochemical device has higher passing rate in a drop test, and when a being more than or equal to 0.3 × b and less than or equal to 0.7 × b, the passing rate is higher (more than or equal to 90%).
The orthographic projection of the second bonding region 32 on the first surface 31 at least covers the second area 312, as shown in FIGS. 6-9; the second adhesive area 32 has a second outer edge 321, the second area 312 has a third outer edge 312a, and an orthogonal projection of the second outer edge 321 on the first surface surrounds the third outer edge 312 a.
In this embodiment, when the casing 1 of the electrochemical device is subjected to an external force (for example, the casing 1 is subjected to an external force during a drop test), since the orthographic projection of the second bonding region 32 on the first surface covers at least the second region 312, the external force of the second bonding region 32 can be transmitted to the second region 312, the bonding strength of the second region 312 is high, the risk of the bond between the second region 312 and the electrode assembly 2 being broken is low under the external force, the external force at the edge of the second bonding region 32 can be transmitted to the first region 311, and since the bonding strength of the first region 311 is low, the bond between the first region 311 and the electrode assembly 2 can be broken under the external force, so that the energy of the external force is absorbed, and the risk of the insulating tape 3 tearing the electrode assembly 2 is reduced.
In one embodiment, as shown in FIGS. 6-9, the width of the first bonding region 31 is W2, and the distance between the first inner edge 311a of the first region 311 and the first outer edge 315 of the first bonding region 31 is b, 0.1 XW 2. ltoreq. b.ltoreq.0.45 XW 2. For example, b may be specifically 0.15 xW 2, 0.2 xW 2, 0.3 xW 2, 0.4 xW 2, or the like.
In the present embodiment, when the ratio between b and W2 is too small, it means that the first region 311 having a smaller adhesive strength in the first adhesive region 31 is too small in size, and the second region 312 having a larger adhesive strength is too large in size, so that the region where the connection between the insulating tape 3 and the electrode assembly 2 is broken by external force is small, and the external force cannot be effectively absorbed, thereby causing the insulating tape 3 to tear the aluminum foil of the electrode assembly 2; when the ratio of b to W2 is too large, it means that the size of the first region 311 having a small adhesive strength in the first adhesive region 31 is too large and the size of the second region 312 having a large adhesive strength is too small, which results in a decrease in the reliability of the connection between the insulating tape 3 and the electrode assembly 2, and the electrode assembly 2 moves relative to the case 1 by an external force, which decreases the reliability of the electrochemical device. When b is 0.1 xW 2 ≦ b ≦ 0.45 xW 2, the first region 311 and the second region 312 have moderate sizes, and the insulating tape 3 can be prevented from tearing the aluminum foil of the electrode assembly 2 while preventing the electrode assembly 2 from coming apart.
Taking a lithium ion battery with a rectangular maximum projection surface as an example to perform a drop test, and comparing drop passing rates, wherein the group 7 has a structure shown in fig. 6, and the dislocation exists around the insulating tape 3; the number of repeated experiments of the lithium ion batteries at each position is set to be 20, the passing rate is required to be not less than 80% (namely at least 16 lithium ion batteries do not fail when falling) to be qualified, and the falling working condition is six-sided and four-corner. Wherein the electrode assembly 2 of the rectangular lithium ion battery selected had a length L1 of 87mm and a width W1 of 64mm, the first adhesive region 31 had a length L2 of 60mm and a width W2 of 42mm, the adhesive strength P1 of the first region in the insulating tape 3 was 2.4MPa, the adhesive strength P2 of the second adhesive region was 8MPa, and the adhesive strength P3 of the second region was 8 MPa. The test results are shown in the following table:
from the test results in the table above, it can be seen that: after the insulating tape 3 with b being more than or equal to 0.1 xW 2 and less than or equal to 0.45 xW 2 is arranged, the electrochemical device has higher passing rate in a drop test, and when b is more than or equal to 0.1 xW 2 and less than or equal to 0.4 xW 2, the passing rate is higher (more than or equal to 90%).
In the above embodiments, as shown in fig. 1 to 9, an orthogonal projection of the geometric center of the second adhesion region 32 on the first surface coincides with the geometric center of the first adhesion region 31, and a ratio of a distance extending from the geometric centers of the first adhesion region 31 and the second adhesion region 32 to the first outer edge 315 to a distance extending to the second outer edge 321 in the same direction is the same.
In this embodiment, since the orthogonal projection of the geometric center of the second adhesive region 32 on the first surface coincides with the geometric center of the first adhesive region 31, after the insulating tape 3 is adhered to the case 1 and the electrode assembly 2, the stress applied to the first adhesive region 31 and the second adhesive region 32 is relatively uniform, and the structural strength of the insulating tape 3 is improved. Meanwhile, since the ratio of the distance extending from the geometric centers of the first and second adhesive regions 31 and 32 to the first outer edge 315 in the same direction to the distance extending to the second outer edge 321, respectively, is the same, the orthographic projection of the second adhesive region 32 on the first surface is located in the middle of the first adhesive region 31, so that the uniformity of the force transmitted from the second adhesive region 32 to the first adhesive region 31 can be further improved, and the structural strength of the insulating tape 3 and the adhesive strength between the insulating tape 3 and the electrode assembly 2 can be improved.
Specifically, as shown in FIG. 10, the length of the third surface 21 of the electrode assembly 2 is L1, and the first bonding region 31 has a first axis 313 and the third surface 21 has a second axis 211 along the width direction of the electrochemical device, and the distance between the orthogonal projection of the first axis 313 on the third surface 21 and the second axis 211 is D, wherein D is less than or equal to 0.1 × L1. For example, D may be 0.05L1, 0.06L1, and the like. The first axis 313 and the second axis 211 are both axes extending along the width direction of the electrochemical device, and in the embodiment shown in fig. 10, the first bonding region 31 is symmetrical with respect to the first axis 313 and the third surface 21 is symmetrical with respect to the second axis 211 along the length direction. In addition, the width of the third surface 21 of the electrode assembly 2 is W1, the first adhesion region 31 of the insulating tape 3 has a third axis 314 and the third surface 21 has a fourth axis 212 along the length direction of the electrochemical device, wherein the third axis 314 and the fourth axis 212 are both axes extending along the length direction of the electrochemical device, and in the embodiment shown in fig. 10, the first adhesion region 31 is symmetrical with respect to the third axis 314 and the third surface 21 is symmetrical with respect to the fourth axis 212 along the width direction of the electrochemical device. In the present embodiment, the distance between the orthographic projection of the third axis 314 on the bonding surface and the fourth axis 212 is E, wherein E is less than or equal to 0.1 xW 1. For example, E may be 0.05W1, 0.06W1, and the like.
In the present embodiment, the weight of the electrode assembly 2 is not uniform throughout, and the reliability of the connection of the insulating tape 3 to the electrode assembly 2 is affected by the weight of the electrode assembly 2, so that, when the weight of the electrode assembly 2 is not uniform, the influence of the weight of the electrode assembly 2 on the reliability of the connection between the insulating tape 3 and the electrode assembly 2 can be reduced by changing the position of the insulating tape 3 on the adhesion surface.
In the above embodiments, as shown in fig. 10, the electrode assembly 2 has the third surface 21 bonded to the insulating tape 3, the third surface 21 has a length of L1 and a width of W1; the first surface 31 of the insulating tape 3 for bonding with the electrode assembly 2 has a length of L2 and a width of W2; wherein, L2 is more than or equal to 0.4 xL 1 and less than or equal to 0.8 xL 1, and W2 is more than or equal to 0.4 xW 1 and less than or equal to 0.8 xW 1. For example, L2 may be specifically 0.4 × L1, 0.5 × L1, 0.7 × L1, 0.8 × L1, etc., and W2 may be specifically 0.4 × W1, 0.6 × W1, 0.7 × W1, 0.8 × W1, etc.
In one embodiment, as shown in fig. 1 to 4, the electrode assembly 2 has a third surface 21 adhered to the insulating tape 3, that is, the third surface 21 of the electrode assembly 2 is adhered to the first adhesion region 31 of the insulating tape 3, wherein the first adhesion region 31 covers an orthographic projection of the second adhesion region 32 on the third surface 21.
In this embodiment, when the first bonding region 31 covers the orthographic projection of the second bonding region 32 on the third surface 21, the external force transmitted from the second bonding region 32 can be completely transmitted to the first bonding region 31 through the insulating tape 3, and then transmitted to the third surface 21 of the electrode assembly 2, so that the risk of the insulating tape 3 breaking under the action of the external force is reduced, the structural strength and the service life of the insulating tape 3 are improved, the connection reliability between the case 1 and the electrode assembly 2 is improved, and the risk of short circuit of the electrode assembly 2 is reduced.
In a first embodiment, the insulating tape 3 may be a split structure, and as shown in fig. 6 and 8, the insulating tape 3 at least includes a first adhesive material 33 for bonding with the electrode assembly 2 and a second adhesive material 34 for bonding with the case 1, and the first bonding region 31 is located on the first adhesive material 33, and the second bonding region 32 is located on the second adhesive material 34.
The first adhesive material 33 and the second adhesive material 34 are both double-sided adhesive tapes, so that one surfaces of the first adhesive material 33 and the second adhesive material 34 are bonded, and the other surfaces are used for bonding with the electrode assembly 2 and the case 1 respectively. In this embodiment, the insulating tape 3 of this split type structure has the advantages of simple structure and convenient processing, and the first bonding area 31 and the second bonding area 32 that can be convenient for realize the insulating tape 3 have different bonding strengths.
In another embodiment, as shown in fig. 7 and 9, the insulating tape 3 includes a first adhesive material 33, a base material 35 and a second adhesive material 34, which are sequentially stacked, wherein the base material 35 is located between and connected to the first adhesive material 33 and the second adhesive material 34, the first adhesive material 33 is used for bonding with the electrode assembly 2, i.e. the first adhesive region 31 is disposed on the first adhesive material 33, and the second adhesive material 34 is used for bonding with the case 1, i.e. the second adhesive region 32 is disposed on the second adhesive material 34.
As shown in fig. 7 and 9, the area of the first adhesive material 33 is larger than that of the second adhesive material 34, the size of the base material 35 is the same as that of the first adhesive material 33 having a larger area, the first adhesive material 33 and the base material 35 may be bonded, and the second adhesive material 34 and the base material 35 may be bonded.
In this embodiment, the base material 35 of the insulating tape 3 can support the first adhesive material 33 and the second adhesive material 34, so as to improve the structural strength of the insulating tape 3, further reduce the risk of damage to the insulating tape 3 under the action of external force, and improve the reliability of connection between the case 1 and the electrode assembly 2. Meanwhile, the insulating adhesive tape 3 with the split structure has the advantages of simple structure and convenience in processing, and the first surface 31 and the second surface 32 of the insulating adhesive tape 3 have different bonding strengths.
Meanwhile, in the above two embodiments, when the first surface 31 of the insulating tape 3 includes the first region 311 and the second region 312 with different bonding strengths, the first adhesive material 33 may also be a split structure, that is, the first adhesive material 33 may include at least two adhesive material monomers, and the bonding strengths of the two adhesive material monomers are P1 and P3, so that the bonding strengths of the first region 311 and the second region 312 are P1 and P3, respectively.
More specifically, as shown in fig. 8 and 9, a gap 316 is provided between the first region 311 and the second region 312 of the first bonding region 31 in the insulating tape 3, that is, a gap 316 is provided between the third outer edge 312a of the second region 312 and the first inner edge 311a of the first region 311, that is, a gap 316 is provided between two single adhesive bodies forming the first adhesive 33.
In the present embodiment, when the gap 316 is provided between the first region 311 and the second region 312, it is possible to prevent external force acting on the insulating tape 3 from being transmitted between the first region 311 and the second region 312, thereby reducing the risk of the external force transmitted to the second region 312 causing the adhesive bond between the second region 312 and the electrode assembly 2 to be broken, improving the connection reliability between the insulating tape 3 and the electrode assembly 2, and thus improving the reliability and lifespan of the electrochemical device. Meanwhile, when the first region 311 and the second region 312 are located in different adhesive materials, the two regions can be conveniently provided with different bonding strengths, and the processing difficulty of the insulating tape 3 is reduced.
In the above embodiments, as shown in fig. 11, in the insulating tape 3, the shape of the first adhesion region 31 and the second adhesion region 32 is selected from any one of a square shape, a rectangular shape, a trapezoidal shape, an octagonal shape, a circular shape, and an oval shape.
The electrochemical device in the embodiments of the present application may be used in various fields, and the electrochemical device in the embodiments of the present application may be used as long as the device capable of supplying power using the electrochemical device can be used. For example, the electrochemical device may be used in an electrochemical device package of an electric vehicle, an electronic device, and the like, and the electronic device may be a mobile phone, a tablet computer, a desktop computer, a laptop computer, a handheld computer, a notebook computer, an ultra-mobile personal computer (UMPC), a netbook, a cellular phone, a Personal Digital Assistant (PDA), an Augmented Reality (AR) device, a Virtual Reality (VR) device, an Artificial Intelligence (AI) device, a wearable device, a vehicle-mounted device, a smart home device and/or a smart city device, an electric tool, an energy storage device electric tricycle, an electric vehicle, and the like.
Specifically, the electronic device may include a housing, a screen, a circuit board, and an electrochemical device, wherein the screen, the circuit board, and the electrochemical device are mounted to the housing, and the electrochemical device is the electrochemical device described in any of the above embodiments.
The above description is only a preferred embodiment of the present application and is not intended to limit the present application, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, improvement and the like made within the spirit and principle of the present application shall be included in the protection scope of the present application.
Claims (12)
1. An electrochemical device, comprising:
a housing;
an electrode assembly, at least a portion of the electrode assembly being located within the housing; and
an insulating tape between the case and the electrode assembly, the insulating tape including a first surface adhered to the electrode assembly and a second surface adhered to the case; the first surface comprises a first adhesive region and the second surface comprises a second adhesive region;
wherein an area A of the first adhesion region and an area B of the second adhesion region satisfy: B/A is more than or equal to 0.08 and less than or equal to 0.95, the bonding strength of the second bonding area is P2, the first bonding area comprises a first area with the bonding strength of P1, and P1 is more than or equal to 0.2 xP 2 and less than or equal to 0.9 xP 2.
2. The electrochemical device of claim 1, wherein said first bonding zone has a first outer edge and said second bonding zone has a second outer edge;
an orthographic projection of the second outer edge on the first surface is located within the first region.
3. The electrochemical device according to claim 2, wherein a distance between an orthogonal projection of the second outer edge on the first surface and the first outer edge is a, and a width of the first surface is W2, wherein 0.05 xW 2 ≦ a ≦ 0.4 xW 2.
4. The electrochemical device of claim 3, wherein the first adhesive region further comprises a second region having an adhesive strength of P3, 0.2 XP 3 ≦ P1 ≦ 0.9 XP 3.
5. The electrochemical device of claim 4, wherein an orthographic projection of the second adhesion region on the first surface covers the second area.
6. The electrochemical device of claim 4, wherein the first region has a first inner edge spaced from the first outer edge by a distance b, wherein 0.2 x b ≦ a ≦ 0.8 x b.
7. The electrochemical device according to claim 6, wherein 0.1 xW 2 ≦ b ≦ 0.45 xW 2.
8. The electrochemical device of claim 6, wherein said second region has a third outer edge that is coincident with said first inner edge.
9. The electrochemical device according to claim 7, wherein at least one of the following conditions is satisfied:
a)0.4×P2≤P1≤0.9×P2；
b)0.05×W2≤a≤0.35×W2；
c)0.3×b≤a≤0.7×b；
d)0.1×W2≤b≤0.4×W2。
10. the electrochemical device according to claim 1, wherein the electrode assembly has a third surface to which the insulating tape is bonded, and the first bonding region covers an orthographic projection of the second bonding region on the third surface.
11. The electrochemical device according to claim 1, wherein the insulating tape includes a first adhesive material, a base material, and a second adhesive material stacked in this order, the first adhesive material being bonded to the electrode assembly, and the second adhesive material being bonded to the case.
12. An electronic device comprising the electrochemical device according to any one of claims 1 to 11.
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| PCT/CN2021/074465 WO2022160273A1 (en) | 2021-01-29 | 2021-01-29 | Electrochemical device and electronic apparatus |
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| JP2019046624A (en) * | 2017-08-31 | 2019-03-22 | 株式会社豊田自動織機 | Tape adhesion method of electrode assembly |
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| JP5628464B2 (en) * | 1999-09-16 | 2014-11-19 | 藤森工業株式会社 | Battery using electrode lead member, electrode lead member and method for producing the same, and method for producing battery |
| CN105742712A (en) * | 2014-12-08 | 2016-07-06 | 东莞新能源科技有限公司 | Electrochemical energy storage device |
| CN211907597U (en) * | 2020-03-27 | 2020-11-10 | 宁德新能源科技有限公司 | Battery cell and battery using same |
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| CN105449255A (en) * | 2014-08-05 | 2016-03-30 | 东莞新能源科技有限公司 | Electrochemical energy storage device |
| CN205723715U (en) * | 2016-07-06 | 2016-11-23 | 宁德新能源科技有限公司 | Flexible packing lithium ion battery |
| JP2019046624A (en) * | 2017-08-31 | 2019-03-22 | 株式会社豊田自動織機 | Tape adhesion method of electrode assembly |
| CN109988522A (en) * | 2017-12-29 | 2019-07-09 | 宁德时代新能源科技股份有限公司 | Adhesive tape and electrochemical device comprising same |
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