CN114006021B - Electrochemical device and electric equipment - Google Patents

Electrochemical device and electric equipment Download PDF

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Publication number
CN114006021B
CN114006021B CN202111275908.XA CN202111275908A CN114006021B CN 114006021 B CN114006021 B CN 114006021B CN 202111275908 A CN202111275908 A CN 202111275908A CN 114006021 B CN114006021 B CN 114006021B
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tab
electrochemical device
geometric center
electrode
equal
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CN114006021A (en
Inventor
苏士伟
邓道林
杨兴富
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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0422—Cells or battery with cylindrical casing
    • H01M10/0427—Button cells
    • 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
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded 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
    • H01M50/531—Electrode connections inside a battery casing
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • 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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2220/00—Batteries for particular applications
    • H01M2220/30—Batteries in portable systems, e.g. mobile phone, laptop
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10—Energy storage using batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50—Manufacturing or production processes characterised by the final manufactured product

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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)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The application relates to the technical field of energy storage, and particularly discloses an electrochemical device and electric equipment. The electrochemical device includes a case, an electrode assembly housed in the case, a first tab, and a second tab. The shell comprises a top wall, a side wall and a bottom wall, wherein the top wall is provided with a first electrode. The electrode assembly includes a first electrode sheet and a second electrode sheet. The first tab is connected with the first pole piece and the first electrode. The second lug is connected with the second pole piece. Observing along the direction perpendicular to roof, the contained angle between the length direction of first utmost point ear and the length direction of second utmost point ear is θ, satisfies: θ is more than or equal to 0 and less than or equal to 60 degrees. When the electrochemical device is in a charge/discharge state, the current direction on the first tab is different from the current direction on the second tab, and the magnetic field generated by the first tab and the magnetic field generated by the second tab can at least partially cancel each other, so that the magnetic field generated by the electrochemical device is weakened.

Description

Electrochemical device and electric equipment
Technical Field
The application relates to the technical field of energy storage, in particular to an electrochemical device and electric equipment.
Background
Button cell wide application is in bluetooth headset, and button cell can influence bluetooth headset's audio because of the bottom noise that self magnetic field produced, influences user experience.
Disclosure of Invention
In view of the foregoing, it is desirable to provide an electrochemical device that reduces electromagnetic interference with electrical devices.
In a first aspect of the present application, an electrochemical device is provided, the electrochemical device including a case, an electrode assembly housed in the case, a first tab, and a second tab. The shell comprises a top wall, a side wall and a bottom wall, wherein the top wall is provided with a first electrode. The electrode assembly includes a first electrode sheet and a second electrode sheet. The first tab is connected with the first pole piece and the first electrode. The second lug is connected with the second pole piece. Observing along the direction perpendicular to roof, the contained angle between the length direction of first utmost point ear and the length direction of second utmost point ear is θ, satisfies: θ is more than or equal to 0 and less than or equal to 60 degrees. When the electrochemical device is in a charge/discharge state, the current direction on the first tab and the current direction on the second tab tend to be opposite, and the magnetic field generated by the first tab and the magnetic field generated by the second tab are overlapped and can be at least partially counteracted, so that the magnetic field generated by the electrochemical device is weakened, and the electromagnetic interference to electric equipment is reduced.
Further, in some embodiments of the present application, 0+.θ+.ltoreq.30°. At this time, the effect that the magnetic field generated by the first tab and the magnetic field generated by the second tab cancel each other out is better, and the magnetic field intensity difference is smaller everywhere on the end face.
In some embodiments of the present application, the first tab includes a first connection region connected to the first pole piece and a third connection region connected to the first electrode. The second tab includes a second connection region connected to the second tab and a fourth connection region connected to the housing. The distance between the geometric center of the first connecting area and the geometric center of the third connecting area is L1, the distance between the geometric center of the second connecting area and the geometric center of the fourth connecting area is L2, and the following conditions are satisfied: L1/L2 is more than or equal to 0.18 and less than or equal to 2.75. Compared with other values of L1/L2, when L1/L2 is more than or equal to 0.18 and less than or equal to 2.75, the magnetic field generated by the first tab and the magnetic field generated by the second tab have better mutual cancellation effect, and are beneficial to weakening the magnetic field generated by the electrochemical device.
Further, in some embodiments of the present application, 0.45.ltoreq.L1/L2.ltoreq.2.2. At this time, the effect that the magnetic field generated by the first tab and the magnetic field generated by the second tab cancel each other out is better, and the magnetic field intensity difference everywhere on the end face is smaller.
In some embodiments of the present application, the electrochemical device further includes a first connection member and a second connection member disposed outside the case. The first connecting piece comprises a fifth connecting area connected with the first electrode, and a sixth connecting area is arranged at the end part of the first connecting piece, which is far away from the first electrode. The second connecting piece comprises a seventh connecting area connected with the shell, and an eighth connecting area is arranged at the end part of the second connecting piece, which is far away from the seventh connecting area. The connection line between the geometric center of the fifth connection area and the geometric center of the sixth connection area is W1, the connection line between the geometric center of the seventh connection area and the geometric center of the eighth connection area is W2, and the included angle between W1 and W2 is beta, so that the following conditions are satisfied: beta is more than or equal to 0 DEG and less than or equal to 30 deg. Compared with beta being larger than 30 degrees, when beta being larger than or equal to 0 degrees and smaller than or equal to 30 degrees, the magnetic field generated by the first connecting piece and the magnetic field generated by the second connecting piece have better mutual cancellation effect.
In some embodiments of the present application, the distance between the geometric center of the fifth connection region and the geometric center of the sixth connection region is L3, and the distance between the geometric center of the seventh connection region and the geometric center of the eighth connection region is L4, as viewed in a direction perpendicular to the top wall, satisfying: L3/L4 is more than or equal to 0.45 and less than or equal to 2.2. Compared with other values of L3/L4, when L3/L4 is more than or equal to 0.45 and less than or equal to 2.2, the magnetic field generated by the first connecting piece and the magnetic field generated by the second connecting piece have better mutual counteracting effect, and the difference of the magnetic field intensity at all positions of the end face of the electrochemical device is reduced.
In some embodiments of the present application, the electrode assembly is a rolled structure. The first pole piece comprises a first active material layer, the first active material layer comprises a first end part, and the first end part is arranged at a winding starting end of the winding structure. The second pole piece comprises a second active material layer, the second active material layer comprises a second end part, and the second end part is arranged at the winding starting end of the winding structure. The first tab includes a first connection region connected to the first pole piece. The second tab includes a second connection region connected to the second tab. The distance between the geometric center of the first connecting area and the first end part is D1 along the length direction of the first pole piece; along the length direction of the second pole piece, the distance between the geometric center of the second connecting area and the second end part is D2, and the requirements are satisfied: D1/D2 is more than or equal to 0.5 and less than or equal to 2. Compared with other values of D1/D2, when D1/D2 is more than or equal to 0.5 and less than or equal to 2, the magnetic field generated by the first pole piece and the magnetic field generated by the second pole piece have better mutual cancellation effect, and are beneficial to weakening the magnetic field generated by the electrochemical device.
Further, in some embodiments of the present application, 0.9.ltoreq.D1/D2.ltoreq.1.1. At this time, the effect that the magnetic field generated by the first pole piece and the magnetic field generated by the second pole piece cancel each other out is better, and the difference of the magnetic field intensity at all positions of the end face is smaller.
In some embodiments of the present application, at least one of the following conditions is satisfied: (a) The first tab and the second tab are located on opposite sides of the electrode assembly; (b) The top wall is provided with a first surface and a second surface which are opposite, the top wall is provided with a through hole penetrating through the first surface and the second surface, and at least part of the first electrode is arranged in the through hole; (c) an insulator is disposed between the top wall and the first electrode; (d) the housing comprises a metallic material.
In a second aspect of the present application, there is further provided an electrical apparatus, where the electrical apparatus includes an apparatus body and an electrochemical device, and the electrochemical device is an electrochemical device in any of the foregoing embodiments. The electrochemical device can weaken the magnetic field generated by the electrochemical device, reduce the influence of the magnetic field on the electric equipment and improve the performance of the electric equipment.
Drawings
Fig. 1 is a first view of an electrochemical device in one embodiment of the present application.
Fig. 2 is a second view of an electrochemical device in one embodiment of the present application.
Fig. 3 is a partial cross-sectional view of the electrochemical device of fig. 1.
Fig. 4 is a first view of an electrochemical device in another embodiment of the present application.
Fig. 5 is a second view of an electrochemical device in another embodiment of the present application.
Fig. 6 is a partial cross-sectional view of the electrochemical device of fig. 4.
Fig. 7 is a schematic structural view of a first electrode in another embodiment of the present application.
Fig. 8 is a first view of an electrode assembly, a first tab, and a second tab in another embodiment of the present application.
Fig. 9 is a second view of an electrode assembly, a first tab, and a second tab in another embodiment of the present application.
Fig. 10 is a third view of an electrode assembly, a first tab, and a second tab in another embodiment of the present application.
Fig. 11 is a fourth view of an electrode assembly, a first tab, and a second tab in another embodiment of the present application.
Fig. 12 is a fifth view of an electrode assembly, a first tab, and a second tab in another embodiment of the present application.
Fig. 13 is a sixth view of an electrode assembly, a first tab, and a second tab in another embodiment of the present application.
Fig. 14 is a third view of an electrochemical device in another embodiment of the present application.
Fig. 15 is a graph of magnetic flux density versus θ in experiment one of the present application.
Fig. 16 is a schematic structural diagram of a powered device in an embodiment of the present application.
Description of the main reference signs
Electrochemical device 100
Shell 1
Top wall 11
First electrode 111
First portion 1111
Third surface 1111a
Second portion 1112
First surface 112
Second surface 113
Through hole 114
Side wall 12
Bottom wall 13
Conductive portion 131
The cavity space 14
Electrode assembly 2
First pole piece 21
First active material layer 211
First end 2111
Second pole piece 22
Second active material layer 221
Second end 2211
Separator film 23
First tab 3
First connection region 31
Third connection region 32
Second lug 4
Second connection region 41
Fourth connection region 42
First connector 5
Fifth connection region 51
Sixth connection region 52
Second connector 6
Seventh connection region 61
Eighth connection region 62
Insulating member 7
Electric equipment 200
Device body 210
The geometric center of the first connecting region to the third connecting region L1
Distance between geometric centers of (2)
Geometric center of the second connection region to the fourth connection region L2
Distance between geometric centers of (2)
The geometric center of the fifth connection region and the sixth connection region L3
Distance between geometric centers of (2)
The geometric center of the seventh connection region and the eighth connection region L4
Distance between geometric centers of (2)
First direction X
Second direction Y
Third direction Z
The following detailed description will further illustrate the application in conjunction with the above-described figures.
Detailed Description
The following description of the technical solutions in the embodiments of the present application will be made with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments.
It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. When an element is referred to as being "disposed" on another element, it can be directly on the other element or intervening elements may also be present.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein in the description of the application is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.
Embodiments of the present application provide an electrochemical device including a case, an electrode assembly housed in the case, a first tab, and a second tab. The shell comprises a top wall, a side wall and a bottom wall, wherein the top wall is provided with a first electrode. The electrode assembly includes a first electrode sheet and a second electrode sheet. The first tab is connected with the first pole piece and the first electrode. The second lug is connected with the second pole piece. Observing along the direction perpendicular to roof, the contained angle between the length direction of first utmost point ear and the length direction of second utmost point ear is θ, satisfies: θ is more than or equal to 0 and less than or equal to 60 degrees. When the electrochemical device is in a charge/discharge state, the current direction on the first tab and the current direction on the second tab tend to be opposite, and the magnetic field generated by the first tab overlaps with the magnetic field generated by the second tab, so that the magnetic field generated by the electrochemical device is weakened.
As an example, the electrochemical device is placed on a horizontal plane, with the bottom wall down, and the top wall up, for further explanation.
Embodiments of the present application are further described below with reference to the accompanying drawings.
As shown in fig. 1, 2 and 3, embodiments of the present application provide an electrochemical device 100, the electrochemical device 100 including a case 1, an electrode assembly 2, a first tab 3 and a second tab 4. The electrode assembly 2, the first tab 3 and the second tab 4 are disposed inside the case 1, and the electrode assembly 2 connects the first tab 3 and the second tab 4.
The casing 1 comprises a top wall 11, a side wall 12 and a bottom wall 13, wherein the top wall 11, the side wall 12 and the bottom wall 13 enclose to form a cavity space 14, and the electrode assembly 2, the first tab 3 and the second tab 4 are arranged in the cavity space 14.
The top wall 11 is provided with a first electrode 111, the first electrode 111 being connected to the first tab 3.
In an embodiment, the top wall 11 is provided with a through hole 114 and comprises a first surface 112 and a second surface 113 facing away from each other, the through hole 114 penetrates the first surface 112 and the second surface 113, the first surface 112 is located on a side of the top wall 11 facing the cavity space 14, and the second surface 113 is located on a side of the top wall 11 facing away from the cavity space 14.
At least part of the first electrode 111 is disposed in the through hole 114. In an embodiment, the electrochemical device 100 further includes an insulating member 7, where the insulating member 7 is disposed between the top wall 11 and the first electrode 111, and the insulating member 7 connects the top wall 11 and the first electrode 111, so as to insulate the top wall 11 from the first electrode 111, thereby reducing the risk of short-circuiting the electrochemical device 100.
In one embodiment, the material of the first electrode 111 includes, but is not limited to, aluminum or copper.
In an embodiment, the bottom wall 13 includes a conductive portion 131, and the conductive portion 131 is connected to the second ear 4. In one embodiment, the conductive portion 131 includes a metal material.
As shown in fig. 4, 5 and 6, in one embodiment, the electrochemical device 100 may further include a first connection member 5 and a second connection member 6 disposed outside the case 1, the first connection member 5 being connected to the first electrode 111 such that the first connection member 5 and the first tab 3 are electrically connected; the second connector 6 is connected to the conductive portion 131, and electrically connects the second connector 6 and the second tab 4. The first connector 5 and the second connector 6 may be used to externally connect to an electrical consumer so that the electrochemical device 100 provides power to the electrical consumer.
In one embodiment, the first connector 5 comprises a metallic material. In an embodiment, the second connection member 6 comprises a metallic material.
In other embodiments, the first electrode 111 is disposed in the through hole 114 (not shown), and the insulating member 7 is disposed between the first electrode 111 and the inner wall of the through hole 114.
As shown in fig. 3 and 7, the first electrode 111 includes a first portion 1111 and a second portion 1112.
The first portion 1111 has a third surface 1111a, and the second portion 1112 extends beyond the third surface 1111a.
The first portion 1111 is disposed in the cavity space 14, and the second portion 1112 is disposed in the through hole 114.
For ease of understanding and description, the following description will be given by taking a direction perpendicular to the top wall 11 as a third direction Z, and taking the first direction X as the length direction of the first tab 3 and the second direction Y as the length direction of the second tab 4 as an example when viewed along the third direction Z.
In one embodiment, the insulator 7 is a ring-shaped structure through which the second portion 1112 of the first electrode 111 passes.
In one embodiment, the insulator 7 includes, but is not limited to, a sealant.
As shown in fig. 8 and 9, the electrode assembly 2 includes a first electrode sheet 21, a second electrode sheet 22, and a separator 23, the separator 23 being disposed between the first electrode sheet 21 and the second electrode sheet 22. In one embodiment, the first pole piece 21, the separator 23 and the second pole piece 22 are wound.
One of the first and second electrode sheets 21 and 22 is a positive electrode sheet, and the other is a negative electrode sheet.
One of the first tab 3 and the second tab 4 is a positive tab, and the other is a negative tab.
The first pole piece 21 includes a first active material layer 211, the first tab 3 has a first connection region 31, and the first tab 3 is connected to the first pole piece 21 at the first connection region 31.
The second electrode tab 22 includes a second active material layer 221, the second electrode tab 4 has a second connection region 41, and the second electrode tab 4 is connected to the second electrode tab 22 at the second connection region 41.
In one embodiment, the first tab 3 is located on one side of the electrode assembly 2 and the second tab 4 is located on the opposite side of the electrode assembly 2. In other embodiments, the first tab 3 and the second tab 4 may also be located on the same side of the electrode assembly 2 (not shown).
Referring to fig. 3, 8 and 9, the first tab 3 has a third connection region 32, and the first tab 3 is connected to the first electrode 111 at the third connection region 32. The second lug 4 has a fourth connecting region 42, and the second lug 4 is connected to the bottom wall 13 at the fourth connecting region 42.
Referring to fig. 8, 9 and 10, in one embodiment, the angle between the first direction X and the second direction Y is θ, and θ is 0 ° or more and 60 ° or less, as viewed along the third direction Z.
In the present application, the first direction X (i.e., the length direction of the first tab 3) is: the direction of the line connecting the geometric center of the third connection region 32 with the geometric center of the first connection region 31 is viewed along the third direction Z. The second direction Y (i.e., the length direction of the second tab 4) is: the direction of the line connecting the geometric center of the fourth connection region 42 with the geometric center of the second connection region 41, viewed in the third direction Z. θ is: viewed in the third direction Z, the intersection between the first direction X and the second direction Y forms an angle between the ray from the intersection to the geometric center of the first connection region 31 and the ray from the intersection to the geometric center of the second connection region 41.
When the electrochemical device 100 is in the charge/discharge state, the magnetic field generated by the first tab 3 and the magnetic field generated by the second tab 4 can at least partially cancel, so that the magnetic field generated by the electrochemical device 100 is weakened, and the influence of the magnetic field generated by the electrochemical device 100 on the electric equipment is reduced.
Compared with theta being larger than 60 degrees, when theta being larger than or equal to 0 degrees and smaller than or equal to 60 degrees, the effect that the magnetic field generated by the first tab 3 and the magnetic field generated by the second tab 4 are offset is good, and the influence of the magnetic field generated by the electrochemical device 100 on electric equipment is small.
As shown in FIG. 11, further alternatively, 0.ltoreq.θ.ltoreq.30°. When θ is 0 ° or more and 30 ° or less, the effect of canceling the magnetic field generated by the first tab 3 and the magnetic field generated by the second tab 4 is better than 30 ° < θ is or less than 60 °, and the difference in magnetic field intensity is smaller everywhere on the end face of the electrochemical device 100.
As shown in fig. 12 and 13, the distance between the geometric center of the first connection region 31 and the geometric center of the third connection region 32 is L1, and the distance between the geometric center of the second connection region 41 and the geometric center of the fourth connection region 42 is L2, as viewed in the third direction Z.
Optionally, 0.18.ltoreq.L1/L2.ltoreq.2.75. Compared with other values of L1/L2, when L1/L2 is more than or equal to 0.18 and less than or equal to 2.75, the magnetic field generated by the first tab 3 and the magnetic field generated by the second tab 4 have better mutual cancellation effect, and the magnetic field generated by the electrochemical device 100 has smaller influence on electric equipment.
Further alternatively, 0.45.ltoreq.L1/L2.ltoreq.2.2. At this time, the effect of canceling the magnetic field generated by the first tab 3 and the magnetic field generated by the second tab 4 is better, and the difference in magnetic field intensity is small throughout the end face of the electrochemical device 100.
Referring to fig. 8, 9, 12 and 13, the electrode assembly 2 is a wound structure. In an embodiment, the first active material layer 211 includes a first end portion 2111, the first end portion 2111 is provided at a winding start end of the winding structure, the second active material layer 221 includes a second end portion 2211, and the second end portion 2211 is provided at the winding start end of the winding structure.
The distance D1 from the geometric center of the first connection region 31 to the first end portion 2111 is along the length of the first pole piece 21. The distance from the geometric center of the second connection region 41 to the second end 2211 along the length direction of the second pole piece 22 is D2.
Optionally, D1/D2 is more than or equal to 0.5 and less than or equal to 2. Compared with other values of D1/D2, when D1/D2 is smaller than or equal to 0.5 and smaller than or equal to 2, the effect of the magnetic field generated by the first pole piece 21 and the magnetic field generated by the second pole piece 22 are better in mutual cancellation, and the influence of the magnetic field generated by the electrochemical device 100 on electric equipment is smaller.
Further alternatively, 0.9.ltoreq.D1/D2.ltoreq.1.1. At this time, the effect of canceling the magnetic field generated by the first pole piece 21 and the magnetic field generated by the second pole piece 22 is more excellent, and the difference in magnetic field intensity is small throughout the end face of the electrochemical device 100.
Referring to fig. 4, 5 and 14, the first connecting member 5 includes a fifth connecting region 51 and a sixth connecting region 52, the fifth connecting region 51 is connected to the first electrode 111, and the sixth connecting region 52 is located at an end of the first connecting member 5 away from the first electrode 111. The second connecting member 6 includes a seventh connecting region 61 and an eighth connecting region 62, the seventh connecting region 61 being connected to the bottom wall 13, the eighth connecting region 62 being located at an end of the second connecting member 6 remote from the seventh connecting region 61.
Viewed in the third direction Z, a line between the geometric center of the fifth connection region 51 and the geometric center of the sixth connection region 52 is W1, a line between the geometric center of the seventh connection region 61 and the geometric center of the eighth connection region 62 is W2, and an angle between W1 and W2 is β. In this application, β is an angle between a ray from an intersection point between W1 and W2 to the geometric center of the sixth connection region 52 and a ray from the intersection point to the geometric center of the eighth connection region 62, as viewed in the third direction Z.
Alternatively, β is greater than or equal to 0 and less than or equal to 30. Compared with beta being larger than 30 degrees, when beta being larger than or equal to 0 degrees and smaller than or equal to 30 degrees, the magnetic field generated by the first connecting piece 5 and the magnetic field generated by the second connecting piece 6 have better mutual counteracting effect, and the magnetic field generated by the electrochemical device 100 has smaller influence on electric equipment.
The distance between the geometric center of the fifth connection region 51 and the geometric center of the sixth connection region 52 is L3, and the distance between the geometric center of the seventh connection region 61 and the geometric center of the eighth connection region 62 is L4, as viewed in the third direction Z.
Optionally, 0.45 is less than or equal to L3/L4 is less than or equal to 2.2. Compared with other values of L3/L4, the magnetic field generated by the first connecting piece 5 and the magnetic field generated by the second connecting piece 6 have better mutual cancellation effect, and the magnetic field generated by the electrochemical device 100 has smaller influence on electric equipment.
Further alternatively, 0.9.ltoreq.L3/L4.ltoreq.1.1. At this time, the effect of canceling the magnetic field generated by the first connector 5 and the magnetic field generated by the second connector 6 is more excellent, and the difference in magnetic field intensity is small throughout the end face of the electrochemical device 100.
In order to verify the weakening effect of the present application on the magnetic field generated by the electrochemical device 100, the following comparative experiments were performed:
test one:
the first tab was a positive tab, the second tab was a negative tab, and the value of L1/L2 was 0.9335, and the magnitude of the included angle θ was changed to record the magnetic flux density B1 on the top wall 11 side and the magnetic flux density B2 on the bottom wall 13 side.
In this application, the magnetic flux density is also referred to as magnetic induction, and can be used to indicate the strength of a magnetic field. The larger the value of the magnetic flux density, the stronger the magnetic field, and the smaller the weakening effect on the magnetic field generated by the electrochemical device 100; the smaller the value of the magnetic flux density, the weaker the magnetic field, and the greater the weakening effect on the magnetic field generated by the electrochemical device 100.
Table 1 comparison of records of different included angles θ
Angle θ (°) D1/D2 Magnetic flux density B1/10 -6 (T) Magnetic flux density B2/10 -6 (T)
0 0.9418 4.56 3.39
30 0.9345 5.10 4.12
60 0.9273 6.21 4.85
90 0.9202 8.21 6.54
120 0.9132 10.30 8.93
150 0.9063 10.20 8.65
180 0.8995 9.83 8.23
The above table data is plotted as a graph, as shown in fig. 12.
As can be seen from fig. 15 and table 1, when θ is 0 °, the magnetic flux density B1 is 4.56×10 -6 T and a magnetic flux density B2 of 3.39X10 -6 T. When θ is 30 °, the magnetic flux density B1 is 5.1×10 -6 T (about 1.12 times when θ is 0 DEG), and the magnetic flux density B2 is 4.12X10 -6 T (approximately 1.22 times when θ is 0 °). When θ is 60 °, the magnetic flux density B1 is 6.21X10% -6 T (about 1.36 times when θ is 0 DEG), and the magnetic flux density B2 is 4.85×10 -6 T (approximately 1.43 times when θ is 0 °).
When θ is 0 ° or more and 30 ° or less, the current direction on the first tab 3 and the current direction on the second tab 4 tend to be opposite, and the effect of canceling the magnetic field generated by the first tab 3 and the magnetic field generated by the second tab 4 is good, and the electromagnetic characteristics of the electrochemical device 100 are good. Also, as can be seen from fig. 15, when the included angle θ is varied in the range of 0 ° to 30 °, the slopes of the magnetic flux densities B1 and B2 are both small, i.e., the difference in the effects of the magnetic fields canceling each other between the first tab 3 and the second tab 4 is small in this range.
And (2) testing II:
the first tab was a positive tab, the second tab was a negative tab, the included angle θ was 0 °, D1/D2 was 0.9418, and the values of L1/L2 were changed to record the magnetic flux density B1 on the top wall 11 side and the magnetic flux density B2 on the bottom wall 13 side.
TABLE 2 comparison of recordings of different L1/L2 ratios
Figure BDA0003329968080000091
Figure BDA0003329968080000101
As can be seen from Table 2, when L1/L2 is 1, the magnetic flux density B1 is about 4.56X10 -6 T, magnetic flux density B2 is about 3.43×10 -6 T。
When L1/L2 is 0.45, the magnetic flux density B1 is about 7.7X10 -6 T (about 1.70 times when L1/L2 is 1), and the magnetic flux density B2 is about 5.70X10 -6 T (approximately 1.66 times when L1/L2 is 1).
When L1/L2 is 1.57, the magnetic flux density B1 is about 5.60×10 -6 T (about 1.23 times when L1/L2 is 1), and the magnetic flux density B2 is about 6.32X10 -6 T (approximately 1.84 times when L1/L2 is 1).
When L1/L2 is 1.83, the magnetic flux density B1 is about 5.90X10 -6 T (about 1.29 times when L1/L2 is 1), and the magnetic flux density B2 is about 7.03X10 -6 T (approximately 2.05 times when L1/L2 is 1).
When L1/L2 is 2.20, the magnetic flux density B1 is about 6.61×10 -6 T (about 1.45 times when L1/L2 is 1), and the magnetic flux density B2 is about 7.80×10 -6 T (about 2.27 times when L1/L2 is 1)
Therefore, when L1/L2 is 0.45.ltoreq.2.2, the magnetic field generated by the first tab 3 and the magnetic field generated by the second tab 4 have a good effect of canceling each other, and the magnetic flux densities on the top wall 11 side and the bottom wall 13 side are both less than 8×10 -6 T, the electromagnetic characteristics of the electrochemical device 100 are good. In addition, the magnetic fields generated by the first tab 3 and the second tab 4 are offset more uniformly, so that the difference of the magnetic field intensity at all positions of the end face of the electrochemical device can be reduced. Further, when 0.45.ltoreq.L1/L2.ltoreq.1.57, the magnetic flux density on the top wall 11 side and the bottom wall 13 side varies less than the magnetic flux density when L1/L2 is 1, and it is possible to ensure that the electrochemical device as a whole has good electromagnetic characteristics.
As shown in fig. 16, the embodiment of the present application further provides an electrical device 200, where the electrical device 200 includes a device body 210 and the electrochemical device 100 of any of the above embodiments, and the electrochemical device 100 is disposed on the device body 210. The electrochemical device 100 can weaken the magnetic field generated by itself, has better electromagnetic characteristics, and weakens the influence of the magnetic field of itself on the electric equipment 200.
In addition, other variations within the spirit of the present application will occur to those skilled in the art, and of course, such variations as may be made in light of the spirit of the present application are intended to be included within the scope of the present disclosure.

Claims (9)

1. An electrochemical device comprising:
a housing comprising a top wall, a side wall and a bottom wall, the top wall being provided with a first electrode;
an electrode assembly housed within the housing, the electrode assembly including a first pole piece and a second pole piece;
the first tab is connected with the first pole piece and the first electrode;
the second lug is connected with the second pole piece;
it is characterized in that the method comprises the steps of,
the electrode assembly is of a winding structure, and the first tab and the second tab are bent towards the winding center of the winding structure;
observing along the direction perpendicular to the roof, the included angle between the length direction of the first tab and the length direction of the second tab is θ, which satisfies: θ is more than or equal to 0 and less than or equal to 60 degrees;
the first pole piece comprises a first active material layer, the first active material layer comprises a first end part, and the first end part is arranged at a winding starting end of the winding structure;
the second electrode sheet comprises a second active material layer, and the second active material layer comprises a second end part which is arranged at a winding starting end of the winding structure;
the first tab includes a first connection region connected to the first pole piece;
the second lug comprises a second connection area connected with the second pole piece;
the distance between the geometric center of the first connecting area and the first end part is D1 along the length direction of the first pole piece; along the length direction of the second pole piece, the distance between the geometric center of the second connecting area and the second end part is D2, and the following conditions are satisfied: D1/D2 is more than or equal to 0.5 and less than or equal to 2.
2. The electrochemical device of claim 1, wherein 0 ° or less θ or less than 30 °.
3. The electrochemical device according to claim 1, wherein,
the first tab comprises a first connection region connected with the first pole piece and a third connection region connected with the first electrode;
the second lug comprises a second connecting area connected with the second pole piece and a fourth connecting area connected with the shell;
the distance between the geometric center of the first connecting area and the geometric center of the third connecting area is L1, and the distance between the geometric center of the second connecting area and the geometric center of the fourth connecting area is L2, as viewed along the direction perpendicular to the top wall, and meets the following conditions: L1/L2 is more than or equal to 0.18 and less than or equal to 2.75.
4. The electrochemical device of claim 3, wherein 0.45.ltoreq.L1/L2.ltoreq.2.2.
5. The electrochemical device of claim 1, further comprising:
the first connecting piece and the second connecting piece are arranged outside the shell;
the first connecting piece comprises a fifth connecting area connected with the first electrode, and a sixth connecting area is arranged at the end part of the first connecting piece far away from the first electrode;
the second connecting piece comprises a seventh connecting area connected with the shell, and an eighth connecting area is arranged at the end part of the second connecting piece far away from the seventh connecting area;
looking along the direction perpendicular to the top wall, a connecting line between the geometric center of the fifth connecting area and the geometric center of the sixth connecting area is W1, a connecting line between the geometric center of the seventh connecting area and the geometric center of the eighth connecting area is W2, and an included angle between W1 and W2 is β, so that the following conditions are satisfied: beta is more than or equal to 0 DEG and less than or equal to 30 deg.
6. The electrochemical device of claim 5 wherein the distance between the geometric center of said fifth land and the geometric center of said sixth land, as viewed in a direction perpendicular to said top wall, is L3 and the distance between the geometric center of said seventh land and the geometric center of said eighth land is L4, satisfying: L3/L4 is more than or equal to 0.45 and less than or equal to 2.2.
7. The electrochemical device of claim 1, wherein 0.9.ltoreq.d1/d2.ltoreq.1.1.
8. The electrochemical device of claim 1, wherein at least one of the following conditions is satisfied:
(a) The first tab and the second tab are located on opposite sides of the electrode assembly;
(b) The top wall is provided with a first surface and a second surface which are opposite, the top wall is provided with a through hole penetrating through the first surface and the second surface, and the first electrode is arranged in the through hole;
(c) An insulating piece is arranged between the top wall and the first electrode;
(d) The housing comprises a metallic material.
9. A powered device comprising the electrochemical device of any one of claims 1 to 8.
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