CN114270621B - Electrochemical device and electronic apparatus - Google Patents

Electrochemical device and electronic apparatus Download PDF

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Publication number
CN114270621B
CN114270621B CN202180003657.1A CN202180003657A CN114270621B CN 114270621 B CN114270621 B CN 114270621B CN 202180003657 A CN202180003657 A CN 202180003657A CN 114270621 B CN114270621 B CN 114270621B
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China
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region
electrode assembly
bonding
electrochemical device
insulating tape
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CN202180003657.1A
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CN114270621A (en
Inventor
陈腾腾
马聪
邓道林
陈文�
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Ningde Amperex Technology Ltd
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Ningde Amperex Technology Ltd
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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
    • 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
    • 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
    • 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

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  • 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: a case, an electrode assembly and an insulating tape, the electrode assembly being at least partially located within the case; 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 area with the bonding strength of P1, and P1 is less than P2. Because the area of the first surface is larger than that of the second surface, the pressure intensity born by the first surface and the electrode assembly is reduced, and the volume and the weight of the insulating adhesive tape are smaller on the premise of ensuring the connection reliability between the insulating adhesive tape and the shell, so that the energy density of the electrochemical device is improved. When P1 is less than P2, the risk that the aluminum foil of the electrode assembly is torn by the insulating adhesive tape in the falling process is reduced, the short circuit inside the electrode assembly is prevented, and the service life and the reliability of the electrochemical device are improved.

Description

Electrochemical device and electronic apparatus
Technical Field
The present application relates to the field of energy storage devices, and in particular, to an electrochemical device and an electronic apparatus.
Background
With the development of electronic devices, a battery of the electronic device is required to have a larger capacity so as to meet the endurance requirement of the electronic device. A battery of an electronic device generally includes a case and an electrode assembly located inside the case, the case protecting the electrode assembly. The shell and the electrode assembly can be bonded through the insulating adhesive tape, when the electronic equipment falls, the insulating adhesive tape can possibly tear the electrode assembly, so that internal short circuit of the electrode assembly occurs, and when the insulating adhesive tape is poor in bonding, risks such as top sealing burst and the like can possibly occur, so that the safety of the electronic equipment is affected.
Disclosure of Invention
The application provides an electrochemical device and an electronic apparatus, which can improve connection reliability between an electrode assembly and a case, reduce risk of tearing of an aluminum foil of the electrode assembly, improve anti-drop capability, and improve energy density of the electrochemical device.
The 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 bonding area, and the second surface comprises a second bonding area; 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×P2 and less than or equal to 0.9×P2.
In another possible design, 0.4×P2.ltoreq.P1.ltoreq.0.9×P2.
In one possible design, the first adhesive region has a first outer edge and the second adhesive region has a second outer edge; the orthographic projection of the second outer edge on the first surface is located in 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 0.05XW2.ltoreq.a.ltoreq.0.4XW2. In another possible design, 0.05XW2.ltoreq.a.ltoreq.0.35XW2.
In one possible design, the first bonding region further includes a second region having a bond strength P3 of 0.2X1.ltoreq.P1.ltoreq.0.9X1.3. In another possible design, 0.3×P3.ltoreq.P1.ltoreq.0.9×P3.
In one possible design, the orthographic projection of the second adhesive region on the first surface covers the second region.
In one possible design, the first region has a first inner edge, the distance between the first inner edge and the first outer edge being b, wherein 0.2Xb.ltoreq.a.ltoreq.0.8Xb. In another possible design, 0.3 Xb.ltoreq.a.ltoreq.0.7 Xb.
In one possible design, 0.1XW2.ltoreq.b.ltoreq.0.45XW2. In another possible design, 0.1 XW2.ltoreq.b.ltoreq.0.4 XW2.
In one possible design, the second region has a third outer edge that coincides with the first inner edge.
In one possible design, the orthographic projection of the geometric center of the second bonding region on the first surface coincides with the geometric center of the first bonding region.
In one possible design, the ratio of the distance extending from the geometric centers of the first and second adhesive areas in the same direction to the first outer edge, respectively, to the distance extending to the second outer edge is the same.
In one possible design, the electrode assembly has a third surface bonded to the insulating tape, the third surface having a length L1 and a width W1; the first bonding area is provided with a first axis and the third surface is provided with a second axis along the width direction of the electrochemical device, and the distance between the orthographic projection of the first axis on the third surface and the second axis is D which is less than or equal to 0.1 multiplied by L1.
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, and the distance E between the orthographic projection of the third axis on the third surface and the fourth axis is E.ltoreq.0.1XW1.
In one possible design, the length of the first bonding region is L2 and the width of the first bonding region is W2; wherein L2 is more than or equal to 0.4×L1 and less than or equal to 0.8×L1, W2 is more than or equal to 0.4×W1 and less than or equal to 0.8×W1.
In one possible design, the first adhesive region covers the orthographic projection of the second adhesive region on the third surface.
In one possible design, the insulating tape includes a first adhesive, a base material, and a second adhesive, which are sequentially stacked, the first adhesive being bonded to the electrode assembly, and the second adhesive being bonded to the case.
A second aspect of the present application provides an electronic device comprising the electrochemical apparatus described above.
When the casing of the electrochemical device receives an external force (for example, the casing receives the external force in the drop test process), the external force can be transmitted from the casing to the second bonding area of the insulating tape, and transmitted from the second bonding area to the first bonding area and transmitted from the first bonding area to the electrode assembly, and as the area of the first bonding area is larger than that of the second bonding area, the stripping force applied to the unit area between the first bonding area and the electrode assembly can be reduced, the risk that the insulating tape tears the electrode assembly under the action of the external force is further reduced, the connection reliability between the electrode assembly and the insulating tape is improved, and the safety of the electrode assembly is further improved. Meanwhile, when the area of the second surface of the insulating tape connected with the housing is smaller, the volume and the weight of the insulating tape are also made smaller on the premise of ensuring the connection reliability between the insulating tape and the housing, thereby being beneficial to improving the energy density of the electrochemical device.
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 (such as the shell is subjected to external force in the falling test process), the first area with smaller bonding strength P1 can be separated from adhesion between the electrode assembly when the electrochemical device falls, so that energy transferred to the electrode assembly in the falling process can be absorbed, the risk that the aluminum foil of the electrode assembly is torn by the insulating adhesive tape in the falling process is reduced, short circuit inside the electrode assembly is prevented, and the service life and 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 as claimed.
Drawings
Fig. 1 is a schematic view showing 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 showing 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 an insulating tape according to 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 in 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 in 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 according to an embodiment of the present application;
Fig. 11 is a schematic structural view of an electrochemical device according to another embodiment of the present application.
Reference numerals:
1-a housing;
A 2-electrode assembly;
21-a third surface;
211-a second axis;
212-fourth axis;
3-insulating tape;
31-a first bonding region;
311-first region;
311 a-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 bonding region;
321-a second outer edge;
33-a first glue material;
34-a second adhesive;
35-substrate.
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application.
Detailed Description
For a better understanding of the technical solution of the present application, the following detailed description of the embodiments of the present application refers to the accompanying drawings.
It should be understood that the described embodiments are merely some, but not all, embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The terminology used in the embodiments of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in 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 relationship describing the association of the associated objects, meaning that there may be three relationships, e.g., a and/or B, may represent: a exists alone, A and B exist together, and B exists alone. In addition, the character "/" herein generally indicates that the front and rear associated objects are an "or" relationship.
It should be noted that, the terms "upper", "lower", "left", "right", and the like 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 the context of this document, it will also be understood that when an element is referred to as being "on" or "under" another element, it can be directly on the other element or be indirectly on the other element through intervening elements.
An embodiment of the present application provides an electrochemical device, as shown in fig. 1 to 9, including a case 1 and an electrode assembly 2, the case 1 having a receiving chamber in which at least part of the electrode assembly 2 is located, the case 1 serving to protect the electrode assembly 2. The electrode assembly 2 may include a first electrode sheet, a second electrode sheet, and a separator. One of the first pole piece and the second pole piece is a positive pole, the other is a negative pole, a separation film is used for separating the first pole piece and the second pole piece, the separation film can be supported by thermoplastic resin, such as polyethylene or polypropylene, and the separation film is used for insulating the first pole piece and the second pole piece.
In the drop test, the electrochemical device is easy to break the top seal, tear the aluminum foil of the electrode assembly 2 and the like, so that the short circuit of the electrode assembly 2 is caused, 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 positioned between the case 1 and the electrode assembly 2, and the insulating tape 3 includes a first surface bonded to the electrode assembly 2 and a second surface bonded to the case 1, the first surface includes a first bonding region 31, and the second surface includes a second bonding region 32, i.e., the electrode assembly 2 is connected to the case 1 through the insulating tape 3, thereby preventing the electrode assembly 2 from being moved in the receiving cavity of the case 1 during the operation of the electrochemical device, and the insulating tape 3 also prevents the electrode assembly 2 from being shorted to the case 1, so that the electrochemical device can operate normally. Meanwhile, there is also a risk that the insulating tape 3 tears the aluminum foil of the electrode assembly 2 under the external force during the drop test.
In this embodiment, as shown in fig. 1 to 9, the area of the first bonding region 31 is larger than the area of the second bonding region 32, that is, the area of the surface of the insulating tape 3 bonded to the case 1 is smaller than the area of the surface bonded to the electrode assembly 2. Specifically, the area a of the first bonding area 31 and the area B of the second bonding area 32 satisfy: 0.08.ltoreq.B/A.ltoreq.0.95, for example, B/A may be specifically 0.15, 0.3, 0.5, 0.7, 0.8, etc.
When the case 1 of the electrochemical device receives an external force (for example, the case 1 receives an external force during a drop test), the external force can be transferred 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, since the area of the first bonding region 31 is larger than that of the second bonding region 32, the peeling force applied 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 can be reduced, the connection reliability between the electrode assembly 2 and the insulating tape 3 can be improved, and the safety of the electrode assembly 2 can be further improved. Meanwhile, when the area of the second bonding 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 made 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 (e.g. greater than 0.95), the area a of the first bonding area 31 is closer to the area B of the second bonding area 32, which results in that the peeling force applied between the edge of the first bonding area 31 and the electrode assembly 2 per unit area cannot be effectively reduced, so that the risk of tearing the aluminum foil of the electrode assembly 2 by the insulating tape 3 is higher, and the safety of the electrode assembly 2 is reduced; and causes the weight and volume of the insulating tape 3 to be excessively large, 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 applied per unit area between the insulating tape 3 and the case 1 is large, and the connection reliability is lowered.
Meanwhile, the second bonding area 32 has a bonding strength P2, and the first bonding area 31 includes a first region 311 having a bonding strength P1, where P1 < P2.
Specifically, 0.2×p2.ltoreq.p1.ltoreq.0.9×p2, and for example, P1 may be specifically 0.3×p2, 0.5×p2, 0.6×p2, 0.8×p2, 0.9×p2, 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 close 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 process of the electrochemical device, so that the tensile force transferred from the insulating tape 3 to the electrode assembly 2 cannot be effectively absorbed, resulting in a high risk of tearing the aluminum foil of the electrode assembly 2 by the insulating tape 3; 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, resulting in disconnection between the first region 311 and the electrode assembly 2 under a small external force, which affects the service life and reliability of the electrochemical device. Therefore, when 0.2×p2.ltoreq.p1.ltoreq.0.9×p2, the adhesive strength P1 of the first region 311 and the adhesive strength P2 of the second adhesive 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 adhesion strength of the insulating tape 3 is related to factors such as quality and size of the electrochemical device, and needs to satisfy that the insulating tape 3 and the electrode assembly 2 do not relatively move during the dropping process of the electrochemical device, and the insulating tape 3 does not tear the aluminum foil of the electrode assembly 2. In general, the bonding strength P2 of the second bonding region 32 ranges from 2MPa to 20MPa.
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 the orthographic 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 transferred from the edge of the second bonding area 32 can be completely transferred 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 of shorting the electrode assembly 2 is reduced.
More specifically, as shown in FIGS. 1-5, the second outer edge 321 is spaced a from the first outer edge 315 by a distance of 0.05XW2.ltoreq.a.ltoreq.0.4XW2 in front of the first surface and the width of the first adhesive region 31 is W2. I.e. the orthographic projection of the second outer edge 321 on the first surface is offset from the first outer edge 315. Among the four sides of the insulating tape 3, one side may have the misalignment (as shown in fig. 1 and 2), the opposite side may have the misalignment (as shown in fig. 3 and 4), or both the four sides may have the misalignment (as shown in fig. 5).
In the present embodiment, when a is too large, it means that the difference between the area B of the second adhesive area 32 and the area a of the first adhesive area 31 is too large, that is, the area B of the second adhesive area 32 is too small compared to the first adhesive area 31, that is, the area of the adhesive surface between the insulating tape 3 and the case 1 is too small, resulting in that the peeling force acting on the unit area between the insulating tape 3 and the case 1 is too large, and thus, the connection reliability between the insulating tape 3 and the case 1 is too small; when a is too small, it means that the difference between the area B of the second bonding area 32 and the area a of the first bonding area 31 is too small, i.e., the area of the first bonding area 31 beyond the edge of the second bonding area 32 is too small, resulting in too small a stress acting area transferred from the edge of the second bonding area 32 to the edge of the first bonding area, i.e., the peeling force per unit area between the edge of the first bonding area 31 of the insulating tape 3 and the electrode assembly 2 is too large, thereby causing the insulating tape 3 to easily tear the aluminum foil of the electrode assembly 2, and at the same time, also causing the volume of the insulating tape 3 to be too large, reducing the energy density of the electrochemical device. Therefore, when 0.05xw2.ltoreq.a.ltoreq.0.4xw2, the areas of the first bonding region 31 and the second bonding region 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.
Taking a lithium ion battery with a rectangular maximum projection surface as an example, performing drop test, and comparing drop passing rates, wherein the group 1 has a structure shown in fig. 1 and 2, and the dislocation exists at one side of the insulating tape 3 in the width direction; the group 2 has the structure shown in fig. 3 and 4, which has the above-described misalignment on both sides in the width direction of the insulating tape 3; groups 3 and 4 have the structure shown in fig. 5, which have the above-described dislocation around the insulating tape 3; the first 31 and second 32 adhesive areas of the base set are identical in shape and size. Setting the repeated experiment times of the lithium ion battery at each position to be 20 times, and requiring the passing rate to be not less than 80% (namely, at least 16 lithium ion batteries are not invalid when falling) to be qualified, and falling the working condition: group 1 is a single side drop, group 2 is two opposite side drops, and groups 3-4 and base are six corners. Wherein the length L1 of the electrode assembly 2 of the rectangular lithium ion battery is 87mm, the width W1 is 64mm, the length L2 of the first bonding region 31 is 60mm, and the width W2 is 42mm; the first adhesive region 31 of the insulating tape 3 in the groups 1 to 4 has only the first region 311. The test results are shown in the following table:
From the test results in the above table, it can be seen that: the area A of the first bonding area and the area B of the second bonding area provided by the application satisfy the following conditions: after the insulating tape 3 with the B/A of more than or equal to 0.08 and less than or equal to 0.95 and the P1 of more than or equal to 0.2×P2 of more than or equal to 0.9×P2, the electrochemical device has higher passing rate in drop test, and the passing rate is higher (more than or equal to 90%) when a of more than or equal to 0.05×W2 is more than or equal to 0.35×W2 and P1 of more than or equal to 0.4×P2 is more than or equal to 0.9×P2.
In one embodiment, as shown in fig. 6 to 9, the first bonding area 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, where 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, since the first bonding region 31 has the first region 311 and the second region 312, the second region 312 with the larger bonding strength P3 can improve the connection reliability between the insulating tape 3 and the electrode assembly 2, thereby reducing the risk of the top seal burst caused by the movement of the electrode assembly 2 when the electrochemical device is dropped, and improving the service life and reliability of the electrochemical device; the first region 311 with smaller bonding strength P1 can be separated from adhesion with the electrode assembly 2 when the electrochemical device falls, so that energy transferred 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 tape 3 in the falling process is reduced, short circuit inside the electrode assembly 2 is prevented, and the service life and reliability of the electrochemical device are further improved.
Specifically, 0.2×p3.ltoreq.p1.ltoreq.0.9×p3, and P1 may be specifically 0.5×p3, 0.6×p3, 0.8×p3, 0.9×p3, 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 lower bonding reliability between the insulating tape 3 and the electrode assembly 2, thereby causing the electrode assembly 2 to shift within the case 1. Therefore, when 0.2×p3.ltoreq.p1.ltoreq.0.9×p3, the adhesive strength P1 of the first region 311 and the adhesive 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 adhesion strength of the insulating tape 3 is related to factors such as quality and size of the electrochemical device, and needs to satisfy that the insulating tape 3 and the electrode assembly 2 do not relatively move during 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 20MPa.
In the insulating tape 3, the bonding strength P2 of the second bonding region 32 and the bonding strength P3 of the second region 312 of the first bonding region 31 may be the same or different, and they are not strictly related to each other, as long as they are both greater than the bonding strength P1 of the first region 311.
In one embodiment, the orthographic projection of the second adhesive region 32 on the first surface covers the second region 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 0.2Xb.ltoreq.a.ltoreq.0.8Xb. 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 between a and 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 area 31 and the second bonding area 32 of the insulating tape 3 is small, and thus the volume and weight of the insulating tape 3 cannot be effectively reduced, and the energy density of the electrochemical device is reduced. When the ratio between a and b is too large, the external force acting on the edge of the second bonding area 32 cannot be well transferred to the first area 311 of the first bonding area 31, and thus the bonding between the first area 311 and the electrode assembly 2 cannot be broken when the electrochemical device is subjected to the external force, and thus the external force cannot be effectively absorbed, and the aluminum foil of the electrode assembly 2 is torn by the insulating tape 3. When 0.2×b.ltoreq.a.ltoreq.0.8×b, the distance between the first outer edge 315 and the first inner edge 311a is moderate, and it is possible to improve the energy density of the electrochemical device 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 for carrying out drop test and comparing drop passing rates, wherein the group 5 and the group 6 have structures shown in fig. 6, and the dislocation exists around the insulating adhesive tape 3; the repeated experiment times of the lithium ion battery at each position are set to be 20 times, the required passing rate is not less than 80 percent (namely, at least 16 lithium ion batteries cannot fail when falling down) to be qualified, and the falling working condition is six corners. Wherein the length L1 of the electrode assembly 2 of the rectangular lithium ion battery is 87mm, the width W1 is 64mm, the length L2 of the first bonding region 31 is 60mm, and the width W2 is 42mm. The test results are shown in the following table:
From the test results in the above table, it can be seen that: after the insulating tape 3 with the a being more than or equal to 0.2 Xb and less than or equal to 0.8 Xb and the P1 being more than or equal to 0.2 XP 3 and less than or equal to 0.9 XP 3 is arranged, the electrochemical device has higher passing rate in drop test, and the passing rate is higher (more than or equal to 90 percent) when the a being more than or equal to 0.3 Xb and less than or equal to 0.7 Xb.
At least a second area 312 is covered for the orthographic projection of the second bonding area 32 on the first surface 31, as shown in fig. 6 to 9; the second adhesive area 32 has a second outer edge 321, the second area 312 has a third outer edge 312a, and the second outer edge 321 surrounds the third outer edge 312a in front projection of the first surface.
In this embodiment, when the case 1 of the electrochemical device is subjected to an external force (for example, the case 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 transferred to the second region 312, and the bonding strength of the second region 312 is high, under the action of the external force, the risk of the bonding between the second region 312 and the electrode assembly 2 breaking is low, and the external force at the edge of the second bonding region 32 can also be transferred to the first region 311, and due to the low bonding strength of the first region 311, the bonding between the first region 311 and the electrode assembly 2 can be broken, thereby absorbing the energy of the external force and reducing the risk of the insulating tape 3 tearing the electrode assembly 2.
In one embodiment, as shown in fig. 6 to 9, the width of the first bonding area 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 area 31 is b, and 0.1×w2.ltoreq.b.ltoreq.0.45×w2. For example, b may be specifically 0.15×w2, 0.2×w2, 0.3×w2, 0.4×w2, or the like.
In this embodiment, when the ratio between b and W2 is too small, it means that the size of the first region 311 with smaller bonding strength in the first bonding region 31 is too small, and the size of the second region 312 with larger bonding strength is too large, so that the region where the connection between the insulating tape 3 and the electrode assembly 2 is broken is small under the action of external force, resulting in that the external force cannot be effectively absorbed, and thus the insulating tape 3 tears the aluminum foil of the electrode assembly 2; when the ratio between b and W2 is excessively large, it means that the size of the first region 311 having a smaller bonding strength in the first bonding region 31 is excessively large, and the size of the second region 312 having a larger bonding strength is excessively small, thereby causing the reliability of the connection between the insulating tape 3 and the electrode assembly 2 to be lowered, causing the electrode assembly 2 to be moved relative to the case 1 by an external force, and reducing the reliability of the electrochemical device. When 0.1×w2.ltoreq.b.ltoreq.0.45×w2, the first region 311 and the second region 312 have moderate sizes, and can prevent the insulating tape 3 from tearing the aluminum foil of the electrode assembly 2 while preventing the electrode assembly 2 from moving.
Taking a lithium ion battery with a rectangular maximum projection surface as an example for carrying out 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 adhesive tape 3; the repeated experiment times of the lithium ion battery at each position are set to be 20 times, the required passing rate is not less than 80 percent (namely, at least 16 lithium ion batteries cannot fail when falling down) to be qualified, and the falling working condition is six corners. The length L1 of the electrode assembly 2 of the rectangular lithium ion battery selected was 87mm, the width W1 was 64mm, the length L2 of the first bonding region 31 was 60mm, the width W2 was 42mm, the bonding strength P1 of the first region in the insulating tape 3 was 2.4MPa, the bonding strength P2 of the second bonding region was 8MPa, and the bonding strength P3 of the second region was 8MPa. The test results are shown in the following table:
From the test results in the above table, it can be seen that: after the insulating adhesive tape 3 with the 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 drop test, and the passing rate is higher (more than or equal to 90 percent) when the b being more than or equal to 0.1 xW 2 and less than or equal to 0.4 xW 2.
In the above embodiments, as shown in fig. 1 to 9, the orthographic projection of the geometric center of the second bonding area 32 on the first surface coincides with the geometric center of the first bonding area 31, and the ratio of the distances extending from the geometric centers of the first bonding area 31 and the second bonding area 32 to the first outer edge 315 and the second outer edge 321, respectively, in the same direction is the same.
In this embodiment, since the orthographic projection of the geometric center of the second bonding area 32 on the first surface coincides with the geometric center of the first bonding area 31, after the insulating tape 3 is bonded to the case 1 and the electrode assembly 2, the stress of the first bonding area 31 and the second bonding area 32 is relatively uniform, so as to improve the structural strength of the insulating tape 3. Meanwhile, since the ratio of the distances extending from the geometric centers of the first bonding region 31 and the second bonding region 32 to the first outer edge 315 and the second outer edge 321, respectively, in the same direction is the same, the orthographic projection of the second bonding region 32 on the first surface is located in the middle of the first bonding region 31, so that the uniformity of the force transferred from the second bonding region 32 to the first bonding region 31 can be further improved, and the structural strength of the insulating tape 3 and the bonding strength between the insulating tape 3 and the electrode assembly 2 can be improved.
Specifically, as shown in fig. 10, the third surface 21 of the electrode assembly 2 has a length 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 a distance D between the orthographic projection of the first axis 313 on the third surface 21 and the second axis 211 is equal to or less than 0.1×l1. For example, D may be 0.05L1, 0.06L1, etc. The first axis 313 and the second axis 211 are axes extending in 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 in the length direction. In addition, the width of the third surface 21 of the electrode assembly 2 is W1, the first bonding region 31 of the insulating tape 3 has a third axis 314 along the length direction of the electrochemical device, the third surface 21 has a fourth axis 212, wherein the third axis 314 and the fourth axis 212 are axes extending along the length direction of the electrochemical device, and in the embodiment shown in fig. 10, the first bonding 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 this 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 0.1XW1. For example, E may be 0.05W1, 0.06W1, etc.
In the present embodiment, the weight of the electrode assembly 2 is not uniform throughout, and the connection reliability of the insulating tape 3 and the electrode assembly 2 is affected by the weight of the electrode assembly 2, and therefore, when the weight of the electrode assembly 2 is not uniform, the influence of the weight of the electrode assembly 2 on the connection reliability between the insulating tape 3 and the electrode assembly 2 can be reduced by changing the position of the insulating tape 3 on the bonding surface.
In the above embodiments, as shown in fig. 10, the electrode assembly 2 has a third surface 21 bonded to the insulating tape 3, the third surface 21 having a length L1 and a width W1; the insulating tape 3 has a first surface 31 for bonding with the electrode assembly 2, which has a length L2 and a width W2; wherein L2 is more than or equal to 0.4×L1 and less than or equal to 0.8×L1, W2 is more than or equal to 0.4×W1 and less than or equal to 0.8×W1. For example, L2 may be specifically 0.4×l1, 0.5×l1, 0.7×l1, 0.8×l1, or the like, and W2 may be specifically 0.4×w1, 0.6×w1, 0.7×w1, 0.8×w1, or the like.
In one embodiment, as shown in fig. 1 to 4, the electrode assembly 2 has a third surface 21 bonded to the insulating tape 3, that is, the third surface 21 of the electrode assembly 2 is bonded to a first bonding region 31 of the insulating tape 3, wherein the first bonding region 31 covers an orthographic projection of the second bonding region 32 on the third surface 21.
In this embodiment, when the first bonding area 31 covers the orthographic projection of the second bonding area 32 on the third surface 21, the external force transmitted from the second bonding area 32 can be completely transmitted to the first bonding area 31 through the insulating tape 3, so as to be transmitted to the third surface 21 of the electrode assembly 2, the risk of breaking the insulating tape 3 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 casing 1 and the electrode assembly 2 is improved, and the risk of short-circuiting of the electrode assembly 2 is reduced.
In the first embodiment, the insulating tape 3 may be a split structure, and in the embodiment shown in fig. 6 and 8, the insulating tape 3 includes at least a first adhesive material 33 for adhering to the electrode assembly 2 and a second adhesive material 34 for adhering to the case 1, where the first adhesive region 31 is located on the first adhesive material 33, and the second adhesive 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, so that one surface of the first adhesive material 33 and one surface of the second adhesive material 34 are adhered, and the other surface is adhered to the electrode assembly 2 and the case 1, respectively. In this embodiment, the insulating tape 3 of this split type structure has simple structure, and processing advantage is convenient, and can be convenient for realize that the first bonding area 31 of insulating tape 3 and second bonding area 32 have different bonding strength.
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 stacked in sequence, wherein the base material 35 is located between the first adhesive material 33 and the second adhesive material 34 and is connected to the first adhesive material 33 and the second adhesive material 34, and the first adhesive material 33 is used for bonding with the electrode assembly 2, i.e. the first bonding area 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 bonding area 32 is disposed on the second adhesive material 34.
As shown in fig. 7 and 9, the area of the first adhesive 33 is larger than the area of the second adhesive 34, the size of the substrate 35 is the same as the area of the first adhesive 33 with a larger area, the first adhesive 33 and the substrate 35 may be bonded, and the second adhesive 34 and the substrate 35 may be bonded.
In this embodiment, the substrate 35 of the insulating tape 3 can play a supporting role on 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 damaging the insulating tape 3 under the action of external force, and improve the connection reliability between the case 1 and the electrode assembly 2. Meanwhile, the insulating tape 3 of 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 tape 3 can be conveniently realized to 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 adhesive strengths, the first adhesive 33 may also be a split structure, that is, the first adhesive 33 may include at least two adhesive monomers, and the adhesive strengths of the two adhesive monomers are P1 and P3, respectively, so that the adhesive 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 formed between the first region 311 and the second region 312 of the first adhesive region 31 in the insulating tape 3, that is, a gap 316 is formed 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 formed between two adhesive monomers 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 the 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 breakage of the adhesion between the second region 312 and the electrode assembly 2, improving the connection reliability between the insulating tape 3 and the electrode assembly 2, and thus improving the reliability and the service life of the electrochemical device. Meanwhile, when the first area 311 and the second area 312 are positioned on different adhesive materials, the two areas can be conveniently bonded with different adhesive strengths, and the processing difficulty of the insulating adhesive tape 3 is reduced.
In the above embodiments, as shown in fig. 11, in the insulating tape 3, the shape of the first bonding region 31 and the second bonding region 32 is selected from any one of square, rectangular, trapezoidal, octagonal, circular, elliptical.
The electrochemical device according to the embodiment of the present application may be used in various fields as long as the electrochemical device can be used as a power supply device. For example, the electrochemical device may be used for components such as an electrochemical device package of an electric vehicle and an electronic device, which 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 (augmented reality, AR) device, a Virtual Reality (VR) device, an artificial intelligence (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 electric tricycle, an electric car, etc., and the specific type of the electronic device is not particularly limited in the embodiments of the present application.
Specifically, the electronic apparatus may include a housing, a screen, a circuit board, an electrochemical device, and the like, wherein the screen, the circuit board, and the electrochemical device are all mounted to the housing, and the electrochemical device is the electrochemical device described in any one of the above embodiments.
The above description is only of the preferred embodiments of the present application and is not intended to limit the present application, but various modifications and variations can be made to the present application by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (11)

1. An electrochemical device, characterized in that the electrochemical device comprises:
a housing;
An electrode assembly, at least a portion of which is located within the case; and
An insulating tape between the case and the electrode assembly, the insulating tape including a first surface bonded to the electrode assembly and a second surface bonded to the case; the first surface includes a first bonding region and the second surface includes a second bonding 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 multiplied by P2 and less than or equal to 0.9 multiplied by P2;
The first adhesive region has a first outer edge and the second adhesive region has a second outer edge;
an orthographic projection of the second outer edge on the first surface is located within the first region.
2. The electrochemical device of claim 1, wherein 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 0.05 xw2.ltoreq.a.ltoreq.0.4 xw2.
3. The electrochemical device of claim 2 wherein said first bonding region further comprises a second region of bond strength P3, 0.2 x p3.ltoreq.p1.ltoreq.0.9 x p3.
4. An electrochemical device according to claim 3, wherein the orthographic projection of the second adhesive region on the first surface covers the second region.
5. The electrochemical device of claim 3, wherein the first region has a first inner edge, the distance between the first inner edge and the first outer edge being b, wherein 0.2 x b ∈a ∈0.8 x b.
6. The electrochemical device according to claim 5, wherein 0.1 XW2.ltoreq.b.ltoreq.0.45 XW2.
7. The electrochemical device of claim 5, wherein the second region has a third outer edge that coincides with the first inner edge.
8. The electrochemical device of claim 6, 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。
9. The electrochemical device of claim 1, wherein the electrode assembly has a third surface bonded to the insulating tape, and the first bonding region covers an orthographic projection of the second bonding region on the third surface.
10. The electrochemical device of claim 1, wherein the insulating tape comprises a first adhesive material, a base material, and a second adhesive material, which are sequentially stacked, the first adhesive material being bonded to the electrode assembly, and the second adhesive material being bonded to the case.
11. An electronic device, characterized in that it comprises the electrochemical apparatus according to any one of claims 1 to 10.
CN202180003657.1A 2021-01-29 2021-01-29 Electrochemical device and electronic apparatus Active CN114270621B (en)

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Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN110350236A (en) * 2018-04-08 2019-10-18 宁德时代新能源科技股份有限公司 Electrochemical energy storage device
CN211088369U (en) * 2020-01-10 2020-07-24 东莞新能德科技有限公司 Battery packaging film, battery pack using same and electronic device

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
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
CN110350236A (en) * 2018-04-08 2019-10-18 宁德时代新能源科技股份有限公司 Electrochemical energy storage device
CN211088369U (en) * 2020-01-10 2020-07-24 东莞新能德科技有限公司 Battery packaging film, battery pack using same and electronic device

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