CN113972448A - Electrochemical device and electronic device comprising same - Google Patents

Electrochemical device and electronic device comprising same Download PDF

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Publication number
CN113972448A
CN113972448A CN202111217635.3A CN202111217635A CN113972448A CN 113972448 A CN113972448 A CN 113972448A CN 202111217635 A CN202111217635 A CN 202111217635A CN 113972448 A CN113972448 A CN 113972448A
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region
electrochemical device
area
surface roughness
present application
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CN202111217635.3A
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CN113972448B (en
Inventor
张辉华
王慧鑫
汪颖
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Dongguan Poweramp Technology Ltd
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Dongguan Poweramp 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
    • 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
    • H01M50/536—Electrode connections inside a battery casing characterised by the method of fixing the leads to the electrodes, e.g. by welding
    • 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
    • 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
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • 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

Abstract

The embodiment of the application provides an electrochemical device and an electronic device comprising the electrochemical device1ZSLess than the surface roughness F of the third portion3SThe surface of the first region is made smoother. Therefore, the welding energy transmitted to the first sealing part is reduced, the fusion property and the infiltration property between the first sealing part and the first conversion part are improved, the risk of a leakage channel is reduced, the leakage risk caused by the existence of the leakage channel after the sealing area of the electrochemical device is sealed is further reduced, and the reliable packaging of the electrochemical device is effectively improvedAnd (4) sex.

Description

Electrochemical device and electronic device comprising same
Technical Field
The present disclosure relates to the field of electrochemistry, and more particularly, to an electrochemical device and an electronic device including the same.
Background
When the electrode lug in the lithium ion battery is in transfer welding with the thicker (more than or equal to 0.3mm) adapter plate, higher ultrasonic welding energy is transmitted to the sealing part melting area, so that sol reconstruction is easily caused to form a leakage channel, and leakage of the lithium ion battery after sealing is caused.
The prior art generally adopts the following two schemes to solve the problems: firstly, the problem of leakage is solved by replacing a thinner adapter plate to reduce welding energy, but when the adapter plate is too thin, the overcurrent is small, the temperature of the lithium ion battery rises, and when the adapter plate is too thin, the strength of the adapter plate is too low and the adapter plate is easy to break; second, the leakage problem is improved by adjusting the welding energy low, but this method is not suitable for thicker interposers.
Therefore, it is important to develop a technical solution suitable for the thicker interposer to improve the above problems.
Disclosure of Invention
An electrochemical device and an electronic device including the same are provided to improve the packaging reliability of the electrochemical device.
In the present application, the present application is explained by taking a lithium ion battery as an example of an electrochemical device, but the electrochemical device of the present application is not limited to a lithium ion battery. The specific technical scheme is as follows:
embodiments of a first aspect of the present application provide an electrochemical device including an electrode assembly, a case, a first sealing part, and a first transfer member. The electrode assembly includes a main body portion and a first tab portion connected to the main body portion. The shell is provided with an accommodating cavity, and the electrode assembly is arranged in the accommodating cavity. The first sealing portion is overlapped and connected with the first sealing edge of the shell. A welding area is arranged in an overlapping area of the first adapter and the first tab part in the accommodating cavity, and the first adapter is connected with the first tab part through the welding area; the first adapter extends out of the shell through the first sealing part, and along the extending direction of the first adapter, the first adapter comprises a first part positioned in the accommodating cavity, a second part overlapped with the first sealing part, and a positionA third portion external to the housing; the first part is provided with a first area on a first surface facing the welding area, and the surface roughness F of the first area1ZSLess than the surface roughness F of the third portion3S。
In the electrochemical device according to the embodiment of the present application, the first portion is provided with the first region on the first surface facing the solder mark region, and the surface roughness F of the first region1ZSLess than the surface roughness F of the third portion3SThe surface of the first region is made smoother. Therefore, when the first adapter and the first lug part are welded to form a welding seal area, the binding force between the first adapter and the lug part can be enhanced, and the welding tension is enhanced. Then, the surface roughness F in the first region is maintained1ZSGreater than or equal to the surface roughness F of the third portion3SWhen the welding tension force required by the first adapter and the pole lug is equal, the welding energy is effectively reduced. Therefore, welding energy transmitted to the first sealing part is reduced, the fusion performance and the infiltration performance between the first sealing part and the first conversion part are improved, the risk of a leakage channel is reduced, the leakage risk caused by the existence of the leakage channel after the sealing area of the electrochemical device is sealed is further reduced, and the packaging reliability of the electrochemical device is effectively improved.
In some embodiments of the present application, the area S of the first region1ZArea S of the solder print regionhAnd an area S of the first surface of the first portion facing the solder printing region1Satisfies the following conditions: sh＜S1Z≤S1The first region includes a solder print region. Therefore, the reasonable area of the first area is selected, the welding energy required for welding the first adapter and the first pole lug is reduced under the condition of saving the process flow, the risk of liquid leakage of the liquid leakage channel is reduced, the risk of liquid leakage caused by the existence of the liquid leakage channel after the sealing area of the electrochemical device is sealed is further reduced, and the packaging reliability of the electrochemical device is improved.
In some embodiments of the present application, the area S of the first region1ZArea S of the solder print regionhAnd a first portion facing the first surface of the solder printing regionArea S1Satisfies the following conditions: sh＜S1Z≤2Sh，2Sh＜S1The first region includes a solder print region. Thus, the area of the first region is further reduced, the treated region with low surface roughness is smaller, and the production cost of the electrochemical device is reduced. And the arrangement of the first area reduces welding energy, reduces the liquid leakage risk of the electrochemical device and improves the packaging reliability of the electrochemical device.
In some embodiments of the present application, the first portion is provided with a second region on a second surface facing away from the solder printing region, the second region having a surface roughness F2ZSEqual to the surface roughness F of the first region1ZS. In this way, the second surface of the first part, which faces away from the soldering region, is also provided with a region with low surface roughness, so that the soldering energy can be further reduced, and the packaging reliability of the electrochemical device can be improved.
In some embodiments of the present application, the area S of the second region2ZEqual to the area S of the first region1Z. Thus, the process difficulty of the low surface roughness treatment can be reduced, and the production cost of the electrochemical device can be reduced.
In some embodiments of the present application, the thickness T of the first transition piece is 0.1mm to 0.5 mm. By applying the first adapter in the thickness range to the electrochemical device of the present application, the risk of excessive welding energy is reduced, and the packaging reliability of the electrochemical device is improved. In some embodiments of the present application, the surface roughness F of the first region1ZSAnd the surface roughness F of the third part3SSatisfies the following conditions: f is more than 01ZS≤kF3SWherein k | -0.3712-1.807T +2.15T2| a. By modifying the surface roughness F of the first region1ZSThe welding energy is reduced, the leakage problem of the electrochemical device is improved, and the packaging reliability is effectively improved.
In some embodiments of the present application, the first transition piece has a thickness T of 0.25mm to 0.35mm, and the first region has a surface roughness F1ZSAnd the surface roughness F of the third part3SSatisfies the following conditions: f is more than 01ZS＜0.01F3S. The thickness T of the first transfer piece is 0.25mm to 0.35mm, and the surface roughness F of the first area is adjusted1ZSThe welding energy is obviously reduced, the liquid leakage problem of the electrochemical device is obviously improved, and the packaging reliability of the electrochemical device is better.
In some embodiments of the present application, the surface roughness F of the first region1ZSSurface roughness of the second part F2SAnd the surface roughness F of the third portion3SSatisfies the following conditions: f1ZS＜F2S≤F3S. Surface roughness F of the second part2SWithin the range, the contact surface between the first conversion part and the first sealing part can be increased, and the first conversion part and the first sealing part are more favorably and tightly combined, so that the leakage risk of the electrochemical device is reduced.
In some embodiments of the present application, the weld pull of the weld mark region is greater than or equal to 40N. The welding tension is good, the welding quality of a welding printing area is good, the mechanical safety is good, and the packaging reliability of the electrochemical device is good.
In some embodiments of the present application, a material of the first sealing portion includes at least one of polypropylene, polyimide, polyethylene terephthalate, or polyamide. The material is easy to be thermally sealed and bonded with the inner surface of the shell (such as an aluminum plastic film), so that the sealing performance of the first sealing part and the shell is effectively improved, and the packaging reliability of the electrochemical device is improved.
Embodiments of the second aspect of the present application provide an electronic device comprising an electrochemical device as provided in the first aspect of the present application. The electronic device has good packaging reliability.
Drawings
In order to more clearly illustrate the embodiments of the present application and the technical solutions of the prior art, the following briefly introduces the drawings required for the embodiments of the present application and the prior art, and obviously, the drawings in the following description are only some embodiments of the present application.
Fig. 1 is a schematic structural view (top view) of an electrochemical device according to some embodiments of the present application;
FIG. 2 is a schematic structural view (front view) of an electrochemical device (without a housing) according to some embodiments of the present application;
FIG. 3 is a schematic structural view (front view) of an electrochemical device (without a housing) according to further embodiments of the present disclosure;
fig. 4 is a schematic structural view of a first adapter and a first sealing portion according to some embodiments of the present disclosure.
Detailed Description
In order to make the objects, technical solutions and advantages of the present application more apparent, the present application is further described in detail below with reference to the accompanying drawings and embodiments. It is to be understood that the embodiments described are only a few embodiments of the present application and not all embodiments. All other technical solutions obtained by a person of ordinary skill in the art based on the embodiments in the present application belong to the scope of protection of the present application.
In the embodiments of the present application, the present application is explained by taking a lithium ion battery as an example of an electrochemical device, but the electrochemical device of the present application is not limited to a lithium ion battery. The specific technical scheme is as follows:
as shown in fig. 1 and 2, an embodiment of a first aspect of the present application provides an electrochemical device 10, including: electrode assembly 100, case 200, and first coupler 13 a. The electrode assembly 100 includes a main body portion 101 and a first tab portion 102a connected to the main body portion 101. The case 200 is provided with a receiving cavity 220, and the electrode assembly 100 is disposed in the receiving cavity 220. The first sealing portion 400a overlaps and is connected to the first sealing edge 211 of the case 200. A solder region 300 is provided in the receiving cavity 220 in the overlapping region 103 of the first transition piece 13a and the first pole lug portion 102a, and the first transition piece 13a and the first pole lug portion 102a are connected by the solder region 300. The first conversion member 13a extends out of the housing 200 through the first sealing portion 400a, and the first conversion member 13a includes a first portion 131 located in the accommodating cavity 220, a second portion 132 overlapping the first sealing portion 400a, and a third portion 133 located outside the housing 200 in an extending direction of the first conversion member 13 a. The first portion 131 is provided with a first area at a first surface 131A facing the footprint area 300,surface roughness F of the first region1ZSLess than the surface roughness F of the third portion 1333S. The present application does not particularly limit the method of forming the first region as long as the object of the present application can be achieved. Such as sandblasting or polishing.
In this application, the surface roughness F of the first region is defined as1ZSThe surface roughness of the first region in the first adapter is measured before the first adapter is welded to the first tab portion. It is understood that after the first transfer member is welded with the first tab portion to form the weld region, the surface roughness of the weld region may be changed. In this case, the skilled person can also verify the surface roughness F of the first area by testing the surface roughness of the area of the first area other than the solder area1ZSAnd the surface roughness F of the third portion 1333SThe magnitude relationship between them.
In the present application, the case 200 is further provided with a sealing region 210, and the sealing region 210 is used to seal the end of the accommodating cavity 220, so that the risk that the electrolyte leaks from the end and impurities such as water and oxygen outside the case 200 enter the case 200 can be reduced. The first adapter 13a extends out of the housing 200 through the first sealing portion 400a, the sealing region 210 also seals the first sealing portion 400a extending out of the first adapter 13a to achieve a sealed connection at the joint of the housing 200 and the first adapter 13a, and the first adapter 13a extends out of one side of the sealing region 210 and is called a first sealing edge 211. As shown in fig. 1, in the second direction y, the first adaptor 13a extends from the upper end of the accommodating cavity 220 through the first sealing portion 400a, and the first sealing edge 211 is disposed at the upper end of the accommodating cavity 220. It should be understood that the first transfer member 13a and the first sealing portion 400a are connected together, that is, both surfaces of the first transfer member 13a are provided with the first sealing portion 400a, both surfaces of the first transfer member 13a are opposite to each other in the thickness direction of the first transfer member 13a itself, the thickness direction of the first transfer member 13a may be referred to as a third direction z shown in fig. 2, and the connection of the first transfer member 13a and the first sealing edge 211 is connected with each other through the first sealing portion 400a and the first sealing edge 211.
It should also be understood that "the first sealing portion 400a overlaps the first sealing edge 211" means that a portion of the first sealing portion 400a overlaps the first sealing edge 211, that is, as shown in fig. 1, the first sealing portion 400a includes an overlapping region with the first sealing edge 211 in the sealing region 210 along the second direction y, and further includes an exposed portion 410 located outside the housing 200 and an embedded portion 420 located in the receiving cavity 220. Wherein, the lengths of the exposed portion 410 and the internal portion 420 in the second direction y may be the same or different. Along the first direction x, the first sealing portion 400a completely overlaps the first sealing edge 211, i.e., the first sealing portion 400a is completely covered by the first sealing edge 211 in the first direction x.
Illustratively, as shown in fig. 2, in the accommodating cavity 220, a portion of the first transition piece 13a and the first pole ear portion 102a, which are in contact with each other, forms an overlapping region 103, in which overlapping region 103, the first transition piece 13a and the first pole ear portion 102a are welded to achieve connection therebetween, and a welding mark region 300 is generated when the first transition piece 13a and the first pole ear portion 102a are welded, it being understood that the first transition piece 13a and the first pole ear portion 102a are connected by the welding mark region 300. Wherein the area of the welding region 300 is smaller than or equal to the area of the overlapping region 103. The first transfer member 13a includes a first portion 131 positioned within the receiving cavity 220, a second portion 132 overlapping the first sealing portion 400a, and a third portion 133 positioned outside the housing 200. It is understood that neither the first portion 131 nor the third portion 133 overlaps the first sealing part 400 a. First coupling member 13a serves to draw first tab portion 102a out of case 200 so as to electrically communicate electrode assembly 100 with components outside case 200.
In the electrochemical device 10 of the embodiment of the present application, the first portion 131 is provided with a first region having a surface roughness F at a first surface 131a facing the pad region 3001ZSLess than the surface roughness F of the third portion 1333SThe surface of the first region is made smoother. In this way, when the first tab part 102a and the first transfer part 13a are welded to form the weld region 300, the coupling force between the first transfer part 13a and the tab part 102 can be increased, and the welding tension can be increased. Then, the surface roughness F in the first region is maintained1ZSGreater than or equal to the third partSurface roughness F of minute 1333SThe welding energy is effectively reduced at the same welding tension required to weld the first transfer member 13a and the first pole ear portion 102 a. Therefore, the welding energy transmitted to the first sealing portion 400a is reduced, the fusion property and the wettability between the first sealing portion 400a and the first transfer member 13a are improved, the risk of the liquid leakage channel 430 (as shown in fig. 4) is reduced, the risk of liquid leakage caused by the existence of the liquid leakage channel 430 after the sealing region 210 of the electrochemical device 10 is sealed is further reduced, and the packaging reliability of the electrochemical device 10 is effectively improved.
Further, the main body portion 101 is formed by sequentially winding or stacking the first pole piece 1011, the separator 1012, and the second pole piece 1013. The polarities of the first pole piece 1011 and the second pole piece 1013 are opposite. Specifically, the first pole piece 1011 can be a positive pole piece, and can also be a negative pole piece, and correspondingly, the second pole piece 1013 can be a negative pole piece or a positive pole piece. It is understood that when the main body portion 101 is formed by sequentially winding the first pole piece 1011, the separator 1012, and the second pole piece 1013, the main body portion 101 is in a wound structure; when the main body portion 101 is formed by sequentially stacking the first pole piece 1011, the diaphragm 1012, and the second pole piece 1013, the main body portion 101 is a lamination structure. That is, the body part 101 of the electrode assembly 100 in the embodiment of the present application may be of a wound structure or a laminated structure, which is not limited in the present application.
In some embodiments of the present application, as shown in fig. 2, the first pole ear portion 102a includes a plurality of sub-pole tabs 1021, and the plurality of sub-pole tabs 1021 are respectively connected with the main body portion 101. The first pole ear portion 102a may be a pole tab connected to the first pole piece 1011 and having the same polarity as the first pole piece 1011, or may be a pole tab connected to the second pole piece 1013 and having the same polarity as the second pole piece 1013. Taking the case where the main body 101 is in a laminated structure, the main body 101 is formed by sequentially stacking the first pole piece 1011, the diaphragm 1012, and the second pole piece 1013. The first pole piece portion 102a can be connected to the first pole piece 1011 or the second pole piece 1013, in the former case, each sub-pole tab 1021 of the first pole piece portion 102a is connected to each first pole piece 1011, and in the latter case, each sub-pole tab 1021 of the first pole piece portion 102a is connected to each second pole piece 1013. Further, the plurality of sub-tabs 1021 may be sequentially arranged in the thickness direction of the electrochemical device 10, i.e., the third direction z.
In some embodiments of the present application, as shown in fig. 1 and 3, the electrochemical device 10 further includes a second sealing portion 400b overlapping and connected to the first sealing edge 211 of the case 200, a second pole ear portion 102b connected to the main body portion 101, and a second adaptor 13b connected to the second pole ear portion 102 b. The second sealing portion 400b overlaps and is connected to the first sealing edge 211 of the case 200. A solder-printed region 300 is provided in the receiving cavity 220 in the region of the overlap of the second adapter piece 13b and the second pole lug, and the second adapter piece 13b is connected to the second pole lug 102b via the solder-printed region 300. The second adaptor 13b extends out of the housing 200 via the second sealing portion 400b, and the second adaptor 13b includes a first portion 131 located in the accommodating cavity 220, a second portion 132 overlapping the second sealing portion 400b, and a third portion 133 located outside the housing 200 in an extending direction of the second adaptor 13 b. The first portion 131 is provided with a first region at a first surface 131A facing the solder print region 300, the first region having a surface roughness F1ZSLess than the surface roughness F of the third portion 1333S. It is understood that the second adaptor 13b may have a structure similar to that of the first adaptor 13a, and the second sealing portion 400b may have a structure similar to that of the first sealing portion 400a, which may be referred to the description of the first sealing portion 400a and the first adaptor 13a in any of the foregoing embodiments, and will not be described herein again.
Further, the second pole ear part 102b is connected to the same side of the main body part 101 as the first pole ear part 102a, and the first pole ear part 102a and the second pole ear part 102b have opposite polarities. Specifically, if first pole ear portion 102a is connected to first pole piece 1011 of main body portion 101, then second pole ear portion is connected to second pole piece 1013 of main body portion 101. It is understood that the second pole ear portion can be of similar construction to the first pole ear portion 102 a.
The number of the first pole piece 1011, the diaphragm 1012, the second pole piece 1013, each sub-tab 1021 of the first pole ear part 102a, and each sub-tab 1021 of the second pole ear part 102b are not limited in the present application, and those skilled in the art can select the sub-tabs according to actual situations as long as the purpose of the present application can be achieved.
In some embodiments of the present application, the area S of the first region1ZArea S of the solder print regionhAnd an area S of the first surface of the first portion facing the solder printing region1Satisfies the following conditions: sh＜S1Z≤S1The first region includes a solder print region. Therefore, the reasonable area of the first area is selected, the welding energy required for welding the first adapter and the first pole lug is reduced under the condition of saving the process flow, the risk of liquid leakage of the liquid leakage channel is reduced, the risk of liquid leakage caused by the existence of the liquid leakage channel after the sealing area of the electrochemical device is sealed is further reduced, and the packaging reliability of the electrochemical device is improved. The area S of the first surface1There is no particular limitation as long as the object of the present application can be achieved. For example, S1Can be 0.1cm2To 10cm2。
Further, the area S of the first region1ZArea S of the solder print regionhAnd an area S of the first surface of the first portion facing the solder printing region1Satisfies the following conditions: sh＜S1Z≤2Sh，2Sh＜S1The first region includes a solder print region. In the present application, the area S of the first region1ZGreater than the area S of the solder print regionhAnd the first area comprises a welding and printing area, and it can be understood that after the first adapter is welded with the first tab part, a part of the first area without the welding and printing area is positioned outside the welding and printing area. Thus, the area of the first region is further reduced, the treated region with low surface roughness is smaller, and the production cost of the electrochemical device is reduced. And the arrangement of the first area reduces welding energy, reduces the liquid leakage risk of the electrochemical device and improves the packaging reliability of the electrochemical device.
In some embodiments of the present application, the first portion is provided with a second region on a second surface facing away from the solder printing region, the second region having a surface roughness F2ZSEqual to the surface roughness F of the first region1ZS. Thus, firstAnd a low surface roughness area is also arranged on the second surface of the part back to the welding area, so that the welding energy can be further reduced, and the packaging reliability of the electrochemical device is improved. The first surface and the second surface of the first part are two surfaces which are oppositely arranged along the thickness direction of the first adapter.
In some embodiments of the present application, the area S of the second region2ZEqual to the area S of the first region1Z. Thus, the process difficulty of the low surface roughness treatment can be reduced, and the production cost of the electrochemical device can be reduced.
In some embodiments of the present application, the thickness T of the first transition piece is 0.1mm to 0.5 mm. By applying the first adapter in the thickness range to the electrochemical device of the present application, the risk of excessive welding energy is reduced, and the packaging reliability of the electrochemical device is improved. Particularly, when the adaptor with a relatively thick thickness, for example, the thickness T is more than or equal to 0.3mm, is applied to the electrochemical device, the welding energy is reduced, and the packaging reliability of the electrochemical device is improved. Further, the thickness T of the second adapter piece2The same as the thickness T of the first transition piece.
In some embodiments of the present application, the surface roughness F of the first region1ZSAnd the surface roughness F of the third part3SSatisfies the following conditions: f is more than 01ZS≤kF3SWherein k | -0.3712-1.807T +2.15T2| a. By modifying the surface roughness F of the first region1ZSThe welding energy is reduced, the leakage problem of the electrochemical device is improved, and the packaging reliability is effectively improved. Surface roughness of the third part F3SThere is no particular limitation as long as the object of the present application can be achieved. For example, F3SMay be Ra0.05 to Ra0.1. In some embodiments of the present application, the first transition piece has a thickness T of 0.3mm and the first region has a surface roughness F1ZSAnd the surface roughness F of the third part3SSatisfies the following conditions: f is more than 01ZS＜0.01F3S. The thickness T of the first adapter is 0.3mm, and the surface roughness F of the first area is adjusted1ZSControlled within the above rangeThe welding energy is obviously reduced, the liquid leakage problem of the electrochemical device is obviously improved, and the packaging reliability of the electrochemical device is better.
In some embodiments of the present application, the surface roughness F of the first region1ZSSurface roughness of the second part F2SAnd the surface roughness F of the third portion3SSatisfies the following conditions: f1ZS＜F2S≤F3S. Surface roughness F of the second part2SWithin the range, the contact surface between the first conversion part and the first sealing part can be increased, and the first conversion part and the first sealing part are more favorably and tightly combined, so that the leakage risk of the electrochemical device is reduced.
It will be appreciated by those skilled in the art that in the present application, the thickness of the second adapter, the surface roughness of the first region and/or the second region, etc. are equivalent to the first adapter.
In some embodiments of the present application, the welding tension of the solder print region is greater than or equal to 40N, which indicates that the welding tension is good, the welding quality of the solder print region is good, the mechanical safety is good, and further the packaging reliability of the electrochemical device is good.
In some embodiments of the present application, a material of the first sealing portion includes at least one of polypropylene, polyimide, polyethylene terephthalate, or polyamide. The material is easy to be thermally sealed and bonded with the inner surface of the shell (such as an aluminum plastic film), so that the sealing performance of the first sealing part and the shell is effectively improved, and the packaging reliability of the electrochemical device is improved. It should be understood that the second sealing portion may be made of the same material as the first sealing portion.
The present application does not particularly limit the housing as long as the object of the present application can be achieved. For example, the housing may comprise an inner layer and an outer layer, the inner layer is hermetically connected with the partition plate, and therefore, the material of the inner layer may comprise a polymer material, so as to achieve a good sealing effect; meanwhile, the combination of the inner layer and the outer layer can effectively protect the internal structure of the electrochemical device. Specifically, the material of the inner layer includes at least one of polypropylene, polyester, p-hydroxybenzaldehyde, polyamide, polyphenylene oxide, polyurethane, and the like. In the present application, the material of the outer layer is not particularly limited as long as the object of the present application can be achieved. For example, the material of the outer layer may include at least one of an aluminum foil, an aluminum oxide layer, a silicon nitride layer, and the like. In addition, the shell can also be an aluminum plastic film, and the aluminum plastic film comprises a nylon layer, an aluminum foil layer and a polypropylene (PP) layer. In the present application, the thickness of the case is not particularly limited as long as the object of the present application can be achieved. For example, the thickness of the shell may be 50 μm to 500 μm, preferably 50 μm to 300 μm, more preferably 50 μm to 200 μm. The case within the above thickness range may effectively protect the internal structure of the electrochemical device.
In the present application, the size of the first seal margin is not particularly limited as long as the object of the present application can be achieved. For example, the thickness H (unit: mm) and the width W (unit: mm) of the first seal edge satisfy 0.01 ≦ H/W ≦ 0.05, wherein the thickness is the third direction z and the width is the first direction x. The ratio of H/W is in the range, so that the sealing of the battery can be ensured to be good, and the service life of the battery can be prolonged. In the present application, the seal thickness and the seal width are not particularly limited as long as the object of the present application can be achieved, and for example, the width W of the first seal land is preferably 1mm to 7 mm. In the packaging process, the polymer material in the shell and the packaging material are hot-pressed and sealed together. Therefore, the seal thickness includes the thickness after the potting material is fused with the polymer material of the inner layer of the casing. The sealing width refers to the width of a sealing area formed by combining the packaging material and the high molecular material on the inner layer of the shell after hot-pressing sealing. Note that in the seal area of the present application, the size of the other three seal sides other than the first seal side may be the same as the size of the first seal side.
The material of the first adapter/the second adapter is not particularly limited as long as the purpose of the present application can be achieved. For example, the material of the first adapter includes at least one of aluminum (Al) or an aluminum alloy, and the material of the second adapter includes at least one of nickel (Ni), copper (Cu), or copper-plated nickel (Ni — Cu). Or the material of the second adapter comprises at least one of aluminum (Al) or aluminum alloy, and the material of the first adapter comprises at least one of nickel (Ni), copper (Cu) or copper nickel (Ni-Cu). The present application does not specifically limit the welding method for forming the solder mark region, as long as the object of the present application can be achieved. For example, the welding method may include at least one of a draw through weld, a dot weld, or the like.
The electrochemical device of the present application is not particularly limited, and may include any device in which electrochemical reactions occur. In some embodiments, the electrochemical device may include, but is not limited to: a lithium metal secondary battery, a lithium ion secondary battery (lithium ion battery), a lithium polymer secondary battery, a lithium ion polymer secondary battery, or the like.
The preparation process of the electrochemical device is well known to those skilled in the art, and the present application is not particularly limited, and for example, may include, but is not limited to, the following steps: the electrode assembly of any of the foregoing embodiments is placed in a case, and an electrolyte is injected into the case and sealed, to obtain an electrochemical device. In addition, an overcurrent prevention element, a guide plate, or the like may be placed in the case as necessary to prevent a pressure rise and overcharge/discharge inside the electrochemical device.
In a second aspect, the present application provides an electronic device comprising an electrochemical device according to any one of the preceding aspects. The electronic device has good packaging reliability.
The electronic device of the present application is not particularly limited, and may include, but is not limited to, the following categories: notebook computers, pen-input computers, mobile computers, electronic book players, cellular phones, portable facsimile machines, portable copiers, portable printers, headphones, video recorders, liquid crystal televisions, portable cleaners, portable CD players, mini-discs, transceivers, electronic notebooks, calculators, memory cards, portable recorders, radios, backup power supplies, motors, automobiles, motorcycles, mopeds, bicycles, lighting fixtures, toys, game machines, clocks, electric tools, flashlights, cameras, large household batteries, lithium ion capacitors, and the like.
The terms used in the present application are generally terms commonly used by those skilled in the art, and if they are not consistent with the commonly used terms, the terms in the present application shall control.
Hereinafter, embodiments of the present application will be described in more detail with reference to examples and comparative examples. Various tests and evaluations were carried out according to the following methods. In the following examples and comparative examples, if it is not necessary to distinguish the production method, the first and second adapters, the first and second sealing portions, and the first and second pole ear portions will be collectively referred to as an adapter, a sealing portion, and a pole ear portion, respectively.
The test method and the test equipment are as follows:
testing of surface roughness:
the surface roughness test was carried out using a shape measuring laser microscope system (manufacturer: KEYENCE, model: VK-X3000).
And (3) testing welding energy:
the ultrasonic welding machine was used to read the welding energy values when the adaptor and tab portions were welded to the welding tensions specified in the examples and comparative examples.
Calculation of welding energy reduction rate:
the weld energy reduction ratio (%) (comparative weld energy-example weld energy with thickness of adapter)/comparative weld energy × 100%.
And (3) testing the liquid leakage defective rate:
and (4) carrying out a penetration experiment on the sealing part of the sealed lithium ion battery by using red ink, and counting the liquid leakage reject ratio. And the red ink can permeate into the lithium ion battery, and the test is judged to fail.
The liquid leakage failure rate is the number of failed tests/the number of tests multiplied by 100%.
And (3) testing the improvement rate of leakage:
the liquid leakage improvement rate (%) is (comparative example liquid leakage defective rate-example liquid leakage defective rate with the same adaptor thickness)/comparative example liquid leakage defective rate × 100%.
Example 1
< preparation of first region >
A first region is arranged on the first part of the adapter, and the surface roughness F of the first region1ZS＝0.1F3SArea S of the first region1Z＝S1. Wherein, the thickness T of the adapter piece is 0.1mm, k is | 0.3712-1.807T +2.15T2∣＝0.21，F3S＝Ra 0.1，S1＝0.45cm2
< preparation of lithium ion Battery >
And stacking the prepared positive pole piece, the diaphragm and the negative pole piece in sequence to enable the diaphragm to be positioned between the positive pole and the negative pole to play a role in isolation, and stacking to obtain the electrode assembly with the laminated structure. And welding the first pole lug part and the first adapter part through original point welding, and welding the second pole lug part and the second adapter part through original point welding. And (3) placing the welded electrode assembly into an aluminum-plastic film shell, dehydrating at 80 ℃, injecting a prepared electrolyte, and performing vacuum packaging, standing, formation, shaping and other processes to obtain the lithium ion battery.
Example 2
Except that at<Preparation of the first region>Wherein T is 0.2mm, k is 0.1, F1ZS＝0.01F3SOtherwise, the same procedure as in example 1 was repeated.
Example 3
Except that at<Preparation of the first region>In (F)1ZS＝0.09F3SOtherwise, the same procedure as in example 2 was repeated.
Example 4
Except that at<Preparation of the first region>Wherein T is 0.3mm, k is 0.02, F1ZS＝0.005F3SOtherwise, the same procedure as in example 1 was repeated.
Example 5
Except that at<Preparation of the first region>In (F)1ZS＝0.01F3SOtherwise, the same procedure as in example 4 was repeated.
Example 6
Except that at<Preparation of the first region>In (F)1ZS＝0.02F3SOtherwise, the same procedure as in example 4 was repeated.
Example 7
Except that at<Preparation of the first region>Wherein T is 0.4mm, k is 0.008, F1ZS＝0.005F3SOutside the fieldOtherwise, the same procedure as in example 1 was repeated.
Example 8
Except that at<Preparation of the first region>Wherein T is 0.5mm, k is 0.005, F1ZS＝0.001F3SOtherwise, the same procedure as in example 1 was repeated.
Example 9
Except that at<Preparation of the first region>The first part of the adapter is also provided with a second area, and the area S of the second area2Z＝S1ZOtherwise, the same procedure as in example 5 was repeated.
Example 10
Except that at<Preparation of the first region>In, S1Z＝2ShOtherwise, the same procedure as in example 5 was repeated.
Comparative example 1
The same as in example 1 except that the first region was not provided.
Comparative example 2
The same as in example 2 except that the first region was not provided.
Comparative example 3
The same as in example 4 was repeated except that the first region was not provided.
Comparative example 4
Except that at<Preparation of the first region>In (F)1ZS＝0.05F3SOtherwise, the same procedure as in example 4 was repeated.
Comparative example 5
The same as in example 7 was repeated except that the first region was not provided.
Comparative example 6
The same as in example 8 except that the first region was not provided.
Comparative example 7
Except that at<Preparation of the first region>In, S1Z＝0.5ShOtherwise, the same procedure as in example 5 was repeated.
Comparative example 8
Except that at<Preparation of the first region>Wherein the first region is also arranged on the surface of the second part facing the solder printing region S1Z＝S1+S2Otherwise, the same procedure as in example 5 was repeated.
The preparation parameters and performance parameters of examples 1 to 10 and comparative examples 1 to 8 are shown in table 1:
Figure BDA0003311339400000131
Figure BDA0003311339400000141
as can be seen from examples 1 to 8 and comparative examples 1 to 6, the surface roughness F of the first region varies with the thickness of the adapter1ZSThe welding energy and the leakage improvement rate are changed along with the surface roughness F of the first area1ZSMay vary. Selecting surface roughness F1ZSThe lithium ion battery within the range of the application has the advantages that the welding energy is reduced, the improvement rate of liquid leakage is obviously improved, and the packaging reliability of the lithium ion battery is obviously improved.
As can be seen from example 2, example 9 to example 10, and comparative example 7 to comparative example 8, the welding energy and the leakage improvement rate vary with the area of the low surface roughness region in the first part of the adapter. By selecting the lithium ion battery with the area of the first area and/or the second area within the range of the application, the welding energy is reduced, the leakage improvement rate is obviously improved, and the packaging reliability of the lithium ion battery is obviously improved.
By integrating the above analysis, the electrochemical device provided by the application has the advantages that the first area and/or the second area with low surface roughness are/is arranged in the adapter, so that the welding energy required for welding the adapter and the tab part is reduced, the risk of leakage of the liquid leakage channel due to the existence of the liquid leakage channel after the sealing area of the electrochemical device is sealed is reduced, and the packaging reliability of the electrochemical device is improved.
It is noted that, in this document, relational terms such as "first" and "second," and the like, may be used solely to distinguish one entity from another entity without necessarily requiring or implying any actual such relationship or order between such entities. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that an article or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such article or apparatus.
In this document, the terms "upper", "top", "bottom", "away", "back", "toward", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience in describing corresponding technical solutions of the present application and simplifying the description, but do not indicate or imply that a device or an element must have a specific orientation, be configured and operated in a specific orientation, and thus, should not be construed as limiting the present application.
All the embodiments in the present specification are described in a related manner, and the same and similar parts among the embodiments may be referred to each other, and each embodiment focuses on the differences from the other embodiments.
The above description is only exemplary of the present application and should not be taken as limiting the present application, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present application should be included in the protection scope of the present application.

Claims (12)

1. An electrochemical device, comprising:
an electrode assembly including a main body portion and a first tab portion connected to the main body portion;
a case provided with an accommodation cavity, the electrode assembly being disposed within the accommodation cavity;
a first sealing part overlapped and connected with the first sealing edge of the shell; and
the first adapter is connected with the first pole lug part through the welding area, extends out of the shell through the first sealing part and comprises a first part positioned in the accommodating cavity, a second part overlapped with the first sealing part and a third part positioned outside the shell along the extending direction of the first adapter;
the first part is provided with a first area on a first surface facing the welding area, and the surface roughness F of the first area1ZSLess than the surface roughness F of the third portion3S。
2. The electrochemical device of claim 1, wherein the area S of the first region1ZArea S of the solder printing regionhAnd the area S of the first surface of the first part facing the solder printing region1Satisfies the following conditions: sh＜S1Z≤S1The first region includes the solder print region.
3. The electrochemical device of claim 1, wherein the area S of the first region1ZArea S of the solder printing regionhAnd the area S of the first surface of the first part facing the solder printing region1Satisfies the following conditions: sh＜S1Z≤2Sh，2Sh＜S1The first region includes the solder print region.
4. The electrochemical device as claimed in claim 1, characterized in that the first part is provided with a second region at a second surface facing away from the solder printing region, the second region having a surface roughness F2ZSEqual to the surface roughness F of said first region1ZS。
5. The electrochemical device according to claim 4, wherein the area S of the second region2ZEqual to the area S of the first region1Z。
6. The electrochemical device of claim 1, wherein the first transition member has a thickness T of 0.1mm to 0.5 mm.
7. The electrochemical device according to claim 6, wherein the surface roughness F of the first region1ZSAnd a surface roughness F of the third portion3SSatisfies the following conditions: f is more than 01ZS≤kF3SWherein k | -0.3712-1.807T +2.15T2∣。
8. The electrochemical device of claim 1, wherein said first transition member has a thickness T of 0.25mm to 0.35mm, and said first region has a surface roughness F1ZSAnd a surface roughness F of the third portion3SSatisfies the following conditions: f is more than 01ZS＜0.01F3S。
9. The electrochemical device of claim 1, wherein the first region has a surface roughness F1ZSA surface roughness F of said second portion2SAnd the surface roughness F of the third portion3SSatisfies the following conditions: f1ZS＜F2S≤F3S。
10. The electrochemical device of claim 1, wherein a welding pull of the weld region is greater than or equal to 40N.
11. The electrochemical device according to claim 1, wherein a material of the first sealing part includes at least one of polypropylene, polyimide, polyethylene terephthalate, or polyamide.
12. An electronic device comprising the electrochemical device according to any one of claims 1 to 11.
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115224406A (en) * 2022-09-15 2022-10-21 宁德新能源科技有限公司 Electrochemical device and electronic apparatus

Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002246269A (en) * 2001-02-20 2002-08-30 Kyocera Corp Electrochemical element
US20030232243A1 (en) * 2002-06-12 2003-12-18 Ji-Jun Hong Method for treating electrode tabs of crude cell for lithium secondary battery, and crude cell and lithium secondary battery according to the method
US20110305945A1 (en) * 2008-12-22 2011-12-15 Showa Denko K.K. Positive electrode tab lead, negative electrode tab lead, and battery
US20140170451A1 (en) * 2012-12-18 2014-06-19 Kabushiki Kaisha Toshiba Electrode
CN205376656U (en) * 2016-01-20 2016-07-06 宁德新能源科技有限公司 Secondary battery
CN207441843U (en) * 2017-11-15 2018-06-01 宁德时代新能源科技股份有限公司 Switching piece, cap assembly and secondary cell
CN207530032U (en) * 2017-12-08 2018-06-22 赣州市中金高能电池材料有限公司 A kind of lithium ion cell polar ear of high sealing liquid-leakage preventing
CN108666631A (en) * 2017-03-28 2018-10-16 三洋电机株式会社 The manufacturing method of secondary cell
US20190115611A1 (en) * 2017-10-17 2019-04-18 Sanyo Electric Co., Ltd. Method of manufacturing secondary battery
CN209312884U (en) * 2018-12-07 2019-08-27 东莞塔菲尔新能源科技有限公司 A kind of power battery switching chip architecture and power battery
CN110323448A (en) * 2018-03-29 2019-10-11 Ｊｘ金属株式会社 Lithium ion battery current collector rolled copper foil and lithium ion battery
CN212277348U (en) * 2020-06-03 2021-01-01 新余赣锋电子有限公司 Welding structure for preventing pole piece from being broken
CN212277276U (en) * 2020-05-29 2021-01-01 江苏塔菲尔新能源科技股份有限公司 Connection structure and battery of battery utmost point ear and switching piece
CN113437444A (en) * 2021-06-23 2021-09-24 东莞新能安科技有限公司 Electrochemical device and electronic device
CN113437443A (en) * 2021-06-21 2021-09-24 东莞新能安科技有限公司 Electrochemical device and electronic device

Patent Citations (15)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP2002246269A (en) * 2001-02-20 2002-08-30 Kyocera Corp Electrochemical element
US20030232243A1 (en) * 2002-06-12 2003-12-18 Ji-Jun Hong Method for treating electrode tabs of crude cell for lithium secondary battery, and crude cell and lithium secondary battery according to the method
US20110305945A1 (en) * 2008-12-22 2011-12-15 Showa Denko K.K. Positive electrode tab lead, negative electrode tab lead, and battery
US20140170451A1 (en) * 2012-12-18 2014-06-19 Kabushiki Kaisha Toshiba Electrode
CN205376656U (en) * 2016-01-20 2016-07-06 宁德新能源科技有限公司 Secondary battery
CN108666631A (en) * 2017-03-28 2018-10-16 三洋电机株式会社 The manufacturing method of secondary cell
US20190115611A1 (en) * 2017-10-17 2019-04-18 Sanyo Electric Co., Ltd. Method of manufacturing secondary battery
CN207441843U (en) * 2017-11-15 2018-06-01 宁德时代新能源科技股份有限公司 Switching piece, cap assembly and secondary cell
CN207530032U (en) * 2017-12-08 2018-06-22 赣州市中金高能电池材料有限公司 A kind of lithium ion cell polar ear of high sealing liquid-leakage preventing
CN110323448A (en) * 2018-03-29 2019-10-11 Ｊｘ金属株式会社 Lithium ion battery current collector rolled copper foil and lithium ion battery
CN209312884U (en) * 2018-12-07 2019-08-27 东莞塔菲尔新能源科技有限公司 A kind of power battery switching chip architecture and power battery
CN212277276U (en) * 2020-05-29 2021-01-01 江苏塔菲尔新能源科技股份有限公司 Connection structure and battery of battery utmost point ear and switching piece
CN212277348U (en) * 2020-06-03 2021-01-01 新余赣锋电子有限公司 Welding structure for preventing pole piece from being broken
CN113437443A (en) * 2021-06-21 2021-09-24 东莞新能安科技有限公司 Electrochemical device and electronic device
CN113437444A (en) * 2021-06-23 2021-09-24 东莞新能安科技有限公司 Electrochemical device and electronic device

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN115224406A (en) * 2022-09-15 2022-10-21 宁德新能源科技有限公司 Electrochemical device and electronic apparatus
CN115224406B (en) * 2022-09-15 2023-02-28 宁德新能源科技有限公司 Electrochemical device and electronic apparatus

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