CN110364643B - Secondary battery and method for manufacturing secondary battery - Google Patents
Secondary battery and method for manufacturing secondary battery Download PDFInfo
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- CN110364643B CN110364643B CN201810252349.2A CN201810252349A CN110364643B CN 110364643 B CN110364643 B CN 110364643B CN 201810252349 A CN201810252349 A CN 201810252349A CN 110364643 B CN110364643 B CN 110364643B
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- 238000004519 manufacturing process Methods 0.000 title claims abstract description 36
- 238000000034 method Methods 0.000 title description 24
- 230000000712 assembly Effects 0.000 claims abstract description 28
- 238000000429 assembly Methods 0.000 claims abstract description 28
- 238000003032 molecular docking Methods 0.000 claims abstract description 4
- 238000007789 sealing Methods 0.000 claims description 91
- 208000029154 Narrow face Diseases 0.000 claims description 18
- 238000004806 packaging method and process Methods 0.000 claims description 9
- 230000002093 peripheral effect Effects 0.000 claims description 9
- 229920003023 plastic Polymers 0.000 claims description 6
- 239000004033 plastic Substances 0.000 claims description 6
- 230000004927 fusion Effects 0.000 claims description 5
- 210000001503 joint Anatomy 0.000 claims description 4
- 238000003466 welding Methods 0.000 description 21
- 238000004804 winding Methods 0.000 description 12
- 239000000463 material Substances 0.000 description 10
- 238000002844 melting Methods 0.000 description 8
- 230000008018 melting Effects 0.000 description 7
- 230000035882 stress Effects 0.000 description 7
- 238000005452 bending Methods 0.000 description 6
- 230000000694 effects Effects 0.000 description 5
- 230000002349 favourable effect Effects 0.000 description 3
- 230000001737 promoting effect Effects 0.000 description 3
- 239000000853 adhesive Substances 0.000 description 2
- 230000001070 adhesive effect Effects 0.000 description 2
- 230000006355 external stress Effects 0.000 description 2
- 238000005304 joining Methods 0.000 description 2
- 238000010030 laminating Methods 0.000 description 2
- 238000003754 machining Methods 0.000 description 2
- 230000015572 biosynthetic process Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
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- 238000005516 engineering process Methods 0.000 description 1
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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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/147—Lids or covers
- H01M50/166—Lids or covers characterised by the methods of assembling casings with lids
- H01M50/169—Lids or covers characterised by the methods of assembling casings with lids by welding, brazing or soldering
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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
-
- 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
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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
- H01M50/10—Primary casings; Jackets or wrappings
- H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
- H01M50/107—Primary casings; Jackets or wrappings characterised by their shape or physical structure having curved cross-section, e.g. round or elliptic
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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
- H01M2220/00—Batteries for particular applications
- H01M2220/20—Batteries in motive systems, e.g. vehicle, ship, plane
-
- 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
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- 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)
- Sealing Battery Cases Or Jackets (AREA)
Abstract
The present invention relates to a secondary battery and a method of manufacturing the secondary battery. The secondary battery includes: an electrode assembly having two ends opposite in a height direction; the number of the top cover assemblies is two, and the two top cover assemblies are respectively arranged at two ends of the electrode assembly; and a case enclosing the electrode assembly, the case having two open ends opposed to each other in a height direction, the two open ends being hermetically connected to the two cap assemblies, respectively, to form a sealed space accommodating the electrode assembly, the case including a hermetically sealed docking portion extending from one of the cap assemblies to the other cap assembly in the height direction. The secondary battery of the embodiment of the invention comprises the top cover component and the electrode component which can be assembled in advance, and then the shell is processed and manufactured outside the electrode component and the top cover component.
Description
Technical Field
The present invention relates to the field of secondary battery technology, and more particularly, to a secondary battery and a method for manufacturing the same.
Background
With the wide application of new energy automobiles, people have higher and higher requirements on the energy density of secondary batteries. Secondary batteries currently mainly include a case and an electrode assembly disposed in the case. At present, two methods are used for installing an electrode assembly in a shell, one is to manufacture a hard shell, then integrally insert a top cover and the electrode assembly into the hard shell, and finally weld and seal the top cover and the hard shell; another method is to punch a pit in the soft case, then put the electrode assembly into the pit, and finally seal the pit. In the former method, the wall thickness of the hard case needs to be made thicker to ensure strength, otherwise the open end of the hard case is easily deformed, so that the top cap and the electrode assembly are difficult to insert into the hard case, but the wall thickness of the hard case is made thicker to reduce the secondary energy density; in the latter case, the depressions cannot be made too deep due to the limitation of the stamping process, and thus the thickness of the electrode assembly placed in the depressions can be made thinner, which is disadvantageous for the improvement of the energy density of the secondary battery.
Disclosure of Invention
Embodiments of the present invention provide a secondary battery and a method of manufacturing the secondary battery. The secondary battery comprises a top cover assembly and an electrode assembly which can be assembled in advance, and a shell is machined and manufactured outside the electrode assembly and the top cover assembly, so that the machining and manufacturing modes can reduce the machining and manufacturing difficulty of the secondary battery and improve the energy density of the secondary battery.
In one aspect, an embodiment of the present invention provides a secondary battery including:
an electrode assembly having two ends opposite in a height direction; the number of the top cover assemblies is two, and the two top cover assemblies are respectively arranged at two ends of the electrode assembly; and a case enclosing the electrode assembly, the case having two open ends opposed to each other in a height direction, the two open ends being hermetically connected to the two cap assemblies, respectively, to form a sealed space accommodating the electrode assembly, the case including a hermetically sealed docking portion extending from one of the cap assemblies to the other cap assembly in the height direction.
According to one aspect of an embodiment of the present invention, the top cover assembly includes a top cover plate extending into the open end and sealingly connected to the housing, the top cover plate including two free ends opposed in a length direction; the sealing abutment extends from the free end of one of the top cover plates towards the free end of the other top cover plate.
According to an aspect of the embodiment of the present invention, the number of the sealing interfaces is one, the case is formed by wrapping the electrode assembly with one sheet in a circumferential direction of the electrode assembly, and both edges of the sheet are stacked on one side of the electrode assembly and sealed to form the sealing interfaces in a stacked structure.
According to an aspect of an embodiment of the present invention, the number of the sealing interfaces is two, the case is formed by snap-coupling two sheets to sandwich the electrode assembly, two edges of one sheet are respectively stacked corresponding to two edges of the other sheet and sealed to form two sealing interfaces at opposite sides of the electrode assembly in a length direction.
According to an aspect of an embodiment of the present invention, the electrode assembly is a flat structure, the outer circumferential surface of the electrode assembly includes two wide surfaces opposite in a width direction and two narrow surfaces opposite in a length direction, and the sealing interface is provided corresponding to the narrow surfaces.
According to an aspect of the embodiment of the present invention, the narrow surface is a circular arc surface, and the seal abutting portion is disposed corresponding to a central position of the narrow surface.
According to one aspect of the embodiment of the invention, the housing is of a flexible structure, and the material of the housing and the material of the top cover plate are both plastic.
According to an aspect of the embodiment of the present invention, the seal land is bent toward the electrode assembly and fixed to an outer circumferential surface of the case corresponding to the top cap plate protruding into the open end.
According to the secondary battery provided by the embodiment of the invention, the assembly of the electrode assembly is not required to be carried out in a mode of inserting the electrode assembly into the shell, the electrode assembly and the top cover assembly are connected in advance, and then the electrode assembly is wrapped by the shell blank outside the electrode assembly and the top cover assembly to form the shell. In the assembling process, the electrode assembly is not damaged due to the fact that the electrode assembly is scraped by the shell, meanwhile, the welding process of the top cover assembly and the electrode assembly is easy to operate, an overlarge welding space is not required to be reserved between the top cover assembly and the electrode assembly, the compactness of the integral structure formed by the top cover assembly and the electrode assembly is effectively guaranteed, and the energy density of the secondary battery is improved. In addition, the housing blank of the embodiment needs to maintain elasticity and plasticity to be easily bent and deformed, so that the thickness of the housing blank does not need to be excessively thick and is unnecessary to manufacture, the whole structure of the secondary battery manufactured by processing can be compact and light, and the energy density of the secondary battery can be improved. In addition, since the housing is manufactured by final processing, the thickness of the electrode assembly is not affected or limited by the structure of the housing, so that the electrode assembly with the proper thickness can be flexibly selected to process and manufacture the secondary battery according to the product requirement, and the energy density of the secondary battery is improved.
In another aspect, there is provided a method of manufacturing a secondary battery according to an embodiment of the present invention, including the steps of:
an assembling step of providing an electrode assembly and two cap assemblies, wherein the two cap assemblies are respectively arranged at two opposite end parts of the electrode assembly along the height direction;
and a packaging step of packaging the electrode assembly by using a shell, wherein the shell is formed by wrapping and packaging the electrode assembly by using a sheet, a sealing butt joint part extending from one top cover assembly to the other top cover assembly along the height direction is formed after the sheet is packaged, the shell is provided with two opening ends opposite to each other along the height direction, and the two opening ends are respectively connected with the two top cover assemblies in a sealing way so as to form a closed space for accommodating the electrode assembly.
According to another aspect of an embodiment of the present invention, in the encapsulating step,
the case is formed by wrapping the electrode assembly in a circumferential direction of the electrode assembly with one sheet, and both edges of the sheet are stacked on one side of the electrode assembly and sealed to form a sealed interface of a stacked structure; or,
the case is formed by buckling and connecting two sheets to sandwich the electrode assembly, two edges of one sheet are respectively laminated with two edges of the other sheet and sealed to form two sealed butt-joint parts, and the two sealed butt-joint parts are positioned at two opposite sides of the electrode assembly in the length direction.
According to another aspect of the embodiments of the present invention, after the encapsulating step, the manufacturing method further includes:
the seal butting portion is bent in a direction close to the electrode assembly and fixed to the outer peripheral surface of the case corresponding to the cap assembly extending into the opening end.
According to another aspect of the embodiment of the present invention, in the encapsulating step, the housing is hermetically connected to the cap assembly by heat fusion.
Drawings
Features, advantages and technical effects of exemplary embodiments of the present invention will be described below by referring to the accompanying drawings.
Fig. 1 is a partial sectional structural schematic view of a secondary battery according to an embodiment of the present invention;
fig. 2 is a schematic view of the overall structure of a secondary battery according to an embodiment of the present invention;
FIG. 3 is an enlarged view of a portion of FIG. 2 at A;
fig. 4 is a schematic view of the overall structure of a secondary battery according to another embodiment of the present invention;
FIG. 5 is a partial enlarged view of FIG. 4 at B;
fig. 6 is a schematic view of the overall structure of a secondary battery according to still another embodiment of the present invention;
fig. 7 is an exploded structural view of a secondary battery according to an embodiment of the present invention;
fig. 8 is a flowchart of a method of manufacturing a secondary battery according to an embodiment of the present invention.
In the drawings, the drawings are not necessarily to scale.
Description of the labeling:
1. an electrode assembly; 1a, a wide surface; 1b, narrow face; 1c, an axis;
2. a cap assembly; 21. a top cover plate;
3. a housing; 31. a sealed docking portion;
98. a first region; 99. a second region;
x, height direction; y, the length direction; z, width direction.
Detailed Description
The embodiments of the present invention will be described in further detail with reference to the drawings and examples. The following detailed description of the embodiments and the accompanying drawings are provided to illustrate the principles of the invention and are not intended to limit the scope of the invention, i.e., the invention is not limited to the described embodiments.
In the description of the present invention, it is to be noted that, unless otherwise specified, "a plurality" means two or more; the terms "upper," "lower," "left," "right," "inner," "outer," and the like, as used herein, refer to an orientation or positional relationship indicated for convenience in describing the invention and to simplify description, but do not indicate or imply that the referenced device or element must have a particular orientation, be constructed and operated in a particular orientation, and thus should not be construed as limiting the invention. Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; may be directly connected or indirectly connected through an intermediate. The specific meaning of the above terms in the present invention can be understood as appropriate to those of ordinary skill in the art.
For a better understanding of the present invention, a secondary battery according to an embodiment of the present invention will be described in detail below with reference to fig. 1 to 7.
Fig. 1 schematically shows a partially cross-sectional structure of a secondary battery according to an embodiment of the present invention. Fig. 2 schematically shows the overall structure of a secondary battery according to an embodiment of the present invention. As shown in fig. 1 and 2, the secondary battery of the embodiment of the present invention includes an electrode assembly 1, a cap assembly 2 connected to the electrode assembly 1, and a case 3 for enclosing the electrode assembly 1. The case 3 and the cap assembly 2 are hermetically connected to enclose the electrode assembly 1. The housing 3 has a cylindrical structure with two open ends opposed to each other in the height direction X. The electrode assembly 1 has two ends opposite in the height direction X. Each end of the electrode assembly 1 is provided with a protruding tab. The number of the cap assemblies 2 is two. The two cap assemblies 2 are respectively disposed at two ends of the electrode assembly 1, wherein each cap assembly 2 is electrically connected to the tabs disposed at the corresponding end. The two open ends of the case 3 are hermetically connected to the two cap assemblies 2, respectively, to form a closed space in which the electrode assembly 1 is accommodated. As shown in fig. 3, the housing 3 includes a seal interface 31 extending from one header assembly 2 to the other header assembly 2 in the height direction X.
In the secondary battery according to the embodiment of the present invention, the cap assembly 2 and the electrode assembly 1 are electrically connected to form a semi-finished assembly, and then the electrode assembly 1 and the cap assembly 2 are wrapped with the case blank. Next, the free ends comprised by the shell blank are sealingly connected to form a sealed abutment 31, thereby forming the shell 3 with two open ends. Finally, both open ends of the case 3 are hermetically connected to the two cap assemblies 2, respectively, to seal the electrode assembly 1. Thus, the secondary battery according to the embodiment of the present invention does not need to be assembled by inserting the electrode assembly 1 into the case 3, but the electrode assembly 1 and the cap assembly 2 are electrically connected in advance, and then the case 3 is directly manufactured by using a case blank on the outside of the electrode assembly 1 and the cap assembly 2. In the assembling process, the electrode assembly 1 cannot be scratched by the shell 3 to be damaged, meanwhile, the welding process of the top cover assembly 2 and the electrode assembly 1 is easy to operate, an overlarge welding space does not need to be reserved between the top cover assembly 2 and the electrode assembly 1, the compactness of the integral structure formed by the top cover assembly 2 and the electrode assembly 1 is effectively guaranteed, and the energy density of the secondary battery is improved. In addition, the housing blank of the embodiment needs to maintain elasticity and plasticity to be easily bent and deformed, so that the thickness of the housing blank does not need to be excessively thick and is unnecessary to manufacture, the whole structure of the secondary battery manufactured by processing can be compact and light, and the energy density of the secondary battery can be improved. Moreover, since the case 3 of the embodiment of the present invention is manufactured by final processing, the thickness of the electrode assembly is not affected or limited by the structure of the case 3, so that the electrode assembly with a suitable thickness can be flexibly selected to process and manufacture the secondary battery according to the product requirements, thereby facilitating the improvement of the energy density of the secondary battery.
The top cap assembly 2 of the embodiment of the present invention includes a top cap plate 21 and an electrode terminal disposed on the top cap plate 21. The housing 3 of the present embodiment is hermetically connected to the top cover plate 21. The top cover plate 21 of the present embodiment is a strip structure. The top cover plate 21 has a predetermined length, width and height. The height direction of the top cap plate 21 is the same as the axial direction of the electrode assembly 1. In each drawing, the overall height direction of the top cover 21 is defined as a height direction X, the overall length direction of the top cover 21 is defined as a length direction Y, and a direction perpendicular to both the height direction X and the length direction Y is defined as a width direction Z.
At least a portion of the top cover plate 21 is inserted into the open end of the housing 3 and is sealingly connected to the open end of the housing 3. The top cover plate 21 includes two free ends opposed in the length direction Y. The sealing abutment 31 extends from the free end of one top cover plate 21 towards the free end of the other top cover plate 21. In one example, the seal interface 31 extends in the height direction X.
As shown in fig. 1, the electrode assembly 1 of the present embodiment is a flat structure. The outer peripheral surface of the electrode assembly 1 extending around its own axis 1c includes two opposite wide faces 1a and two opposite narrow faces 1 b. The two wide surfaces 1a are disposed opposite to each other in the width direction Z. The two narrow surfaces 1b are disposed opposite to each other in the longitudinal direction Y. The sealing interface 31 included in the case 3 is disposed corresponding to the narrow face 1b of the electrode assembly 1. When a plurality of secondary batteries of the present embodiment are arranged side by side to constitute a battery module, the wide faces 1a of the electrode assemblies 1 included in each of the adjacent two secondary batteries are arranged opposite to each other, and the narrow faces 1b of the electrode assemblies 1 are exposed to the outside. Thus, on the one hand, since the sealing interface 31 is disposed corresponding to the narrow surface 1b of the electrode assembly 1, the sealing interface 31 does not cause position interference to two adjacent secondary batteries disposed side by side, so that the wide surfaces 1a of the two adjacent secondary batteries are closely attached to each other, no gap is left between the two, the size of the plurality of secondary batteries in the arrangement direction is shortened, and the improvement of the energy density of the battery module is facilitated. On the other hand, in the process of manufacturing and forming the housing 3 by using the housing blank, in order to enhance the sealing performance between the housing 3 and the cap assembly 2, it is necessary to perform a stretching operation on the free end portion included in the housing blank in advance, and then perform a connecting and fixing operation on two adjacent free end portions to form the seal butting portion 31 having a large width. Then release two free end portions, two free end portions can guarantee under the effect of elastic restoring force that casing 3 hugs closely in top cap assembly 2, also the compressive stress that casing 3 applyed to top cap assembly 2 is great promptly to be favorable to promoting the leakproofness between casing 3 and the top cap assembly 2. When the free end portion is pulled, the direction of the pulling force applied to the free end portion is a direction away from the electrode assembly 1. When the two free ends comprised by the shell blank are on the side of the narrow face 1b, it is convenient to use the device for both clamping and stretching operations of the two free ends.
In one embodiment, the narrow face 1b of the electrode assembly 1 is a circular arc face, i.e., the contour line of a cross section of the narrow face 1b perpendicular to the axis 1c of the electrode assembly 1 is a circular arc line segment. The sealing interface 31 is disposed corresponding to the center position of the narrow face 1b of the electrode assembly 1. The center position refers to a center position in the width direction Z. In the process of manufacturing the shell 3 by using the shell blank, when the shell blank and two adjacent free end parts corresponding to the central position of the narrow surface 1b are applied with the stretching force far away from the electrode assembly 1, the stretching force applied to one free end part is equal to the stretching force applied to the other free end part, so that the stretching deformation amount of one free end part is equal to that of the other free end part, and further, after the sealed connecting part formed by sealing the two free end parts is released, the pressure applied to each area of the free end of the top cover plate by the shell 3 is in a balanced state, the condition that the sealing failure is caused by local wrinkling of the area corresponding to the top cover plate 21 on the shell 3 is avoided, and the sealing effect of the free end of the shell 3 and the top cover plate is effectively improved.
In one embodiment, the housing blank is a flexible material that has good elasticity and plasticity, is easily bent around the electrode assembly 1, and is also easily stretch-deformed. When the shell blank receives a preset stretching force, the deformation of the shell blank is large. The material of the case blank and the material of the top cover plate 21 may be the same plastic or different plastics. The two adjacent free end portions included in the housing blank can be connected by hot-melting sealing to form a sealing butt portion 31, so as to form the complete housing 3. The sealed connection between the housing 3 and the top cover plate 21 formed by the housing blank can be easily achieved by means of heat fusion. In this way, the case 3 formed of the case blank has better overall wrappability with the electrode assembly 1, and the sealed state with the top lid plate 21 is more stable. In one embodiment, the heat fusing means may be laser welding, infrared welding, heat sealing, or the like.
The housing blank of this embodiment comprises two adjacent free end portions which are sealingly abutted to form a sealed abutment 31. Fig. 4 schematically shows the overall structure of a secondary battery according to another embodiment of the present invention. As shown in fig. 4 and 5, a bending stress is applied to the sealing land 31 so that the sealing land 31 is bent in a direction to approach the electrode assembly 1 and fixed to the outer circumferential surface of the case 3. The outer peripheral surface on the housing 3 refers to an outer surface area of the housing 3 corresponding to the top cover plate 21 protruding into the open end. In one example, the seal interface 31 is adhesively attached to the outer peripheral surface of the housing 3. Thus, the sealed interfacing portion 31 occupies a small space, so that the overall structure of the secondary battery is more compact, which is advantageous for improving the energy density of the secondary battery. After the bending operation of the sealing abutting portion 31 is completed, the circumferential surfaces of the housing 3 and the top cover plate 21 are easily connected in a sealing manner to form an annular sealing area therebetween, and a good sealing state is also effectively ensured between the area on the housing 3 close to the sealing abutting portion 31 and the top cover plate 21.
In one embodiment, as shown in fig. 1-5, the housing blank is a sheet of plastic material. After the top cap assembly 2 and the electrode assembly 1 are completely assembled, the electrode assembly 1 is wrapped with a sheet in the circumferential direction of the electrode assembly 1, and both edges (i.e., free ends) of itself are stacked on one side of the electrode assembly 1 and sealed to form a sealed butt portion 31 of a stacked structure, at which time, a case blank forms a case 3 having both open ends. In one example, the two edges of the sheet material may be heat fused to form the sealed interface 31, and the heat fusing of the present embodiment may be laser welding, infrared welding, heat sealing, or the like.
In the present embodiment, after the two edges (i.e., the free ends) of one sheet are laminated on one side of the electrode assembly 1, a stretching force is applied to the laminated portion away from the electrode assembly 1 so that the two edges are stretched, thereby facilitating the subsequent formation of the seal land 31 having a larger width. The stretched laminated portion is then subjected to a heat-fusing operation, so that the laminated portion is sealed to form the seal interface 31. Finally, the sealing interface 31 is released, and the sealing interface 31 moves toward the electrode assembly 1 by the elastic restoring force of the sheet itself, and a large compressive stress can be applied to the electrode assembly 1, and at the same time, a large compressive stress can be applied to the electrode assembly 1 and the top cap plate 21 by the area of the sheet near the sealing interface 31 to tightly adhere to the electrode assembly 1 and the top cap plate 21. Therefore, the casing 3 has good wrapping performance on the electrode assembly 1, the condition that the reserved space in the casing 3 is too large is avoided, the activity space of the electrode assembly 1 is reduced, and the position stability of the electrode assembly 1 is improved. In addition, closely laminating between casing 3 and the lamina tecti 21 avoids the casing 3 local condition of corrugating, is favorable to promoting both leakproofness.
As shown in fig. 4 and 5, an external stress is applied to the seal interfacing portion 31 to bend the seal interfacing portion 31 to a position contacting with the outer circumferential surface of the housing 3. The housing 3 and the top cover plate 21 are then subjected to a sealing joining operation along the circumferential direction of the open end of the housing 3 to form an annular sealing region therebetween. In one embodiment, the housing 3 and the top cover plate 21 are thermally welded along the circumferential direction of the open end of the housing 3 to achieve sealing between the housing 3 and the top cover plate 21. The thermal welding in this embodiment may be laser welding, infrared welding, heat sealing, or the like. As shown in fig. 5, the housing 3 has a first region 98 and a second region 99 on both sides of the sealing interface 31. After the sealing abutment 31 is bent, a gap is left between the first region 98 of the housing 3 close to the sealing abutment 31 and the top cover plate 21. When the hot melting mode is adopted for welding, the fused shell 3 and/or the top cover plate 21 can fill the gap so as to seal the gap, and the sealing performance of the shell 3 and the top cover plate 21 is effectively ensured. A second region 99 of the housing 3 adjacent the sealing abutment 31 is covered by the sealing abutment 31. Therefore, when the hot melting welding is adopted, the sealing butt-joint part 31 and the second area 99 and the top cover plate 21 can be melted, so that the sealing butt-joint part 31 and the second area 99 are fixedly connected, the sealing butt-joint part 31 cannot be separated from the bending position, and meanwhile, good sealing performance between the second area 99 and the top cover plate 21 is guaranteed.
In this embodiment, as shown in fig. 2 or 4, a seal abutment 31 extends from the free end of one of the top cover plates 21 toward the free end of the other top cover plate 21. In one embodiment, the electrode assembly 1 is a flat structure having two wide faces 1a and two narrow faces 1 b. The two narrow surfaces 1b are disposed opposite to each other in the longitudinal direction Y. The sealing interface 31 is provided at the center of the narrow face 1b of the electrode assembly 1. In one example, the electrode assembly 1 is formed by winding a positive electrode tab, a negative electrode tab, and a separator disposed between the positive and negative electrode tabs around a winding axis. The electrode assembly 1 has two opposite ends along the winding axis. The positive electrode sheet, the negative electrode sheet, and the separator disposed between the positive electrode sheet and the negative electrode sheet are wound to form a spiral winding at each end.
In one embodiment, fig. 6 schematically shows the overall structure of a secondary battery according to still another embodiment of the present invention. Fig. 7 schematically shows an exploded structure of the secondary battery shown in fig. 6. As shown in fig. 6 and 7, the case blank is two sheets of plastic material. After the assembly of the cap assembly 2 and the electrode assembly 1 is completed, the case 3 is formed by snap-connecting two sheets to sandwich the electrode assembly 1. The two edges (i.e., free end portions) of one sheet are laminated corresponding to the two edges (i.e., free end portions) of the other sheet, respectively, and sealed to form the sealed interfaces 31 of the two laminated structures. Two sealed abutments 31 are located on opposite sides of the electrode assembly 1, with the casing blank forming the casing 3 with two open ends. In one example, two edges of one sheet may be welded to two edges of another sheet to form a sealed interface 31. In the embodiment, the mode that the shell 3 is formed by sealing two sheets is adopted, the splicing operation of the two sheets is simple, and the precision requirement of the splicing position is low, so that the requirement on the processing and manufacturing precision of each sheet is low.
In this embodiment, after the two edges (i.e., the free ends) of one sheet are laminated corresponding to the two edges (i.e., the free ends) of the other sheet, respectively, a stretching force is applied to the laminated portion away from the electrode assembly 1 so that the two edges of the laminate are stretched. The stretched laminated portion is then subjected to a heat-fusing operation, so that the laminated portion is sealed to form the seal interface 31. Finally, the sealing interface 31 is released, and the sealing interface 31 moves toward the electrode assembly 1 by the elastic restoring force of the sheet itself, and a large compressive stress can be applied to the electrode assembly 1, and at the same time, a large compressive stress can be applied to the electrode assembly 1 and the top cap plate 21 by the area of the sheet near the sealing interface 31 to tightly adhere to the electrode assembly 1 and the top cap plate 21. Therefore, the casing 3 has good wrapping performance on the electrode assembly 1, the condition that the reserved space in the casing 3 is too large is avoided, the activity space of the electrode assembly 1 is reduced, and the position stability of the electrode assembly 1 is improved. In addition, closely laminating between casing 3 and the lamina tecti 21 avoids the casing 3 local condition of corrugating, is favorable to promoting both leakproofness.
In one embodiment, external stress is also applied to each sealing abutment 31 to bend each sealing abutment 31 to a position in contact with the outer peripheral surface of the housing 3. The housing 3 and the top cover plate 21 are then subjected to a sealing joining operation in the circumferential direction of the open end of the housing 3. In one embodiment, the housing 3 and the top cover plate 21 are thermally welded along the circumferential direction of the open end of the housing 3 to achieve sealing between the housing 3 and the top cover plate 21. In this embodiment, the housing 3 has a first region 98 and a second region 99 on both sides of each sealing interface 31, as in the embodiment where the housing 3 has one sealing interface 31. After the sealing abutment 31 is bent, a gap is left between the first region 98 of the housing 3 close to the sealing abutment 31 and the top cover plate 21. When the hot melting mode is adopted for welding, the fused shell 3 and/or the top cover plate 21 can fill the gap so as to seal the gap, and the sealing performance of the shell 3 and the top cover plate 21 is effectively ensured. A second region 99 of the housing 3 adjacent the sealing abutment 31 is covered by the sealing abutment 31. Therefore, when the hot melting welding is adopted, the sealing butt-joint part 31 and the second area 99 and the top cover plate 21 can be melted, so that the sealing butt-joint part 31 and the second area 99 are fixedly connected, the sealing butt-joint part 31 cannot be separated from the bending position, and meanwhile, good sealing performance between the second area 99 and the top cover plate 21 is guaranteed.
In this embodiment, two sealing abutments 31 each extend from the free end of one top cover plate 21 towards the free end of the other top cover plate 21. The electrode assembly 1 is of a flat structure having two wide faces 1a and two narrow faces 1 b. The two narrow surfaces 1b are disposed opposite to each other in the longitudinal direction Y. The two seal lands 31 are oppositely disposed in the longitudinal direction Y, and each seal land 31 is disposed at the center position of the corresponding narrow face 1b on the electrode assembly 1. In one example, the electrode assembly 1 is formed by winding a positive electrode tab, a negative electrode tab, and a separator disposed between the positive and negative electrode tabs around a winding axis. The electrode assembly 1 has two opposite ends along the winding axis. The positive electrode sheet, the negative electrode sheet, and the separator disposed between the positive electrode sheet and the negative electrode sheet are wound to form a spiral winding at each end.
In the assembly process of the secondary battery of the above two embodiments, the electrode assembly 1 does not need to be inserted into the case 33, but the electrode assembly 1 and the cap assembly 2 are electrically connected in advance, and then the electrode assembly 1 is sandwiched between two sheets outside the electrode assembly 1 and the cap assembly 2 to directly manufacture the case 3 or the electrode assembly 1 is wrapped by one sheet outside the electrode assembly 1 and the cap assembly 2 to directly manufacture the case 3. And finally, hermetically connecting the shell 3 with the top cover assembly 2 to complete the assembly work of the secondary battery. Thus, in the assembling process, the electrode assembly 1 cannot be scratched by the shell 3 of the embodiment to be damaged, the welding process of the top cover assembly 2 and the electrode assembly 1 is easy to operate, an overlarge welding space does not need to be reserved between the top cover assembly 2 and the electrode assembly 1, the compactness of the integral structure formed by the top cover assembly 2 and the electrode assembly 1 is effectively ensured, and the energy density of the secondary battery is improved. The secondary battery of this embodiment manufacturing degree of difficulty greatly reduces, effectively practices thrift the processing cost. In addition, the sheet of the embodiment needs to maintain elasticity and plasticity to be easy to bend and deform, so that the thickness of the sheet does not need to be excessively thick and is unnecessary to manufacture, the whole structure of the secondary battery manufactured by processing can be compact, and the improvement of the energy density of the secondary battery is facilitated. Moreover, since the case 3 of the embodiment of the present invention is manufactured by final processing, the thickness of the electrode assembly is not affected or limited by the structure of the case 3, so that the electrode assembly with a suitable thickness can be flexibly selected to process and manufacture the secondary battery according to the product requirements, thereby facilitating the improvement of the energy density of the secondary battery.
Fig. 8 is a flowchart schematically showing a method of manufacturing a secondary battery according to an embodiment of the present invention. As shown in fig. 8, an embodiment of the present invention further provides a method for manufacturing a secondary battery, including the steps of:
an assembling step, providing an electrode assembly 1 and two top cover assemblies 2, wherein the two top cover assemblies 2 are respectively arranged at two opposite end parts of the electrode assembly 1 along the axial direction of the electrode assembly 1;
and an encapsulating step of encapsulating the electrode assembly 1 with a case 3, wherein the case 3 is formed by wrapping and encapsulating the electrode assembly 1 with a sheet, the sheet is encapsulated to form a sealing joint part 31 extending away from the electrode assembly 1, and the case 3 has two opening ends along the height direction X, and the two opening ends are respectively connected with the two cap assemblies 2 in a sealing manner to form a closed space for accommodating the electrode assembly 1.
One of the two ends of the electrode assembly 1 of the present embodiment is provided with a positive electrode tab, and the other end is provided with a negative electrode tab. The top cap assembly 2 includes a top cap plate 21 and an electrode terminal. The electrode terminal of one top cover component 2 is electrically connected with the positive electrode tab, and the electrode terminal of the other top cover component 2 is electrically connected with the negative electrode tab.
In the process of processing and manufacturing the secondary battery by adopting the manufacturing method of the secondary battery of the embodiment of the invention, the electrode assembly 1 and the top cover assembly 2 are assembled in advance, then the outer shell 3 is formed by adopting a mode of wrapping and packaging the electrode assembly 1 by sheets, and finally the shell 3 is hermetically connected with the top cover assembly 2 to seal the electrode assembly 1, thereby completing the processing and manufacturing of the secondary battery. Thus, according to the manufacturing method of the embodiment of the present invention, the electrode assembly 1 does not need to be inserted into the case 33 for assembly, but the electrode assembly 1 and the cap assembly 2 are electrically connected in advance, and then the case 3 is directly manufactured by using a sheet material on the outside of the electrode assembly 1 and the cap assembly 2. And finally, hermetically connecting the shell 3 with the top cover assembly 2 to complete the assembly work of the secondary battery. In the assembling process, the electrode assembly 1 cannot be scratched by the shell 3 of the embodiment to be damaged, meanwhile, the welding process of the top cover assembly 2 and the electrode assembly 1 is easy to operate, an overlarge welding space does not need to be reserved between the top cover assembly 2 and the electrode assembly 1, the compactness of the integral structure formed by the top cover assembly 2 and the electrode assembly 1 is effectively guaranteed, and the energy density of the secondary battery is improved. The processing and manufacturing difficulty of the secondary battery is greatly reduced, and the processing cost is effectively saved.
In one embodiment, the electrode assembly 1 is formed by winding a positive electrode tab, a negative electrode tab, and a separator disposed between the positive and negative electrode tabs around a winding axis. The electrode assembly 1 has two opposite ends along the winding axis. The positive electrode sheet, the negative electrode sheet, and the separator disposed between the positive electrode sheet and the negative electrode sheet are wound to form a spiral winding at each end.
In the packaging step of the above-described embodiment,
alternatively, as shown in fig. 1 to 5, the case 3 is formed by wrapping the electrode assembly 1 with one sheet in the circumferential direction of the electrode assembly 1. Both edges of one sheet are stacked on one side of the electrode assembly 1 and sealed to form a sealed interface 31 of a stacked structure. In this embodiment, a sealing abutment 31 extends from the free end of one top cover plate 21 towards the free end of the other top cover plate 21. The electrode assembly 1 is of a flat structure having two wide faces 1a and two narrow faces 1 b. The two narrow surfaces 1b are disposed opposite to each other in the longitudinal direction Y. The sealing interface 31 is provided at the center of the narrow face 1b of the electrode assembly 1.
Alternatively, as shown in fig. 6 and 7, the case 3 is formed by snap-connecting two sheets to sandwich the electrode assembly 1. Both edges of one sheet are stacked corresponding to both edges of the other sheet, respectively, and sealed to form two sealed butt portions 31. Two sealing interfaces 31 are located at opposite sides of the electrode assembly 1. In this embodiment, two sealing abutments 31 each extend from the free end of one top cover plate 21 towards the free end of the other top cover plate 21. The electrode assembly 1 is of a flat structure having two wide faces 1a and two narrow faces 1 b. The two narrow surfaces 1b are disposed opposite to each other in the longitudinal direction Y. The two seal lands 31 are oppositely disposed in the longitudinal direction Y, and each seal land 31 is disposed at the center position of the corresponding narrow face 1b on the electrode assembly 1.
After the packaging step, the method further comprises the following steps: the seal butting portion 31 is bent in a direction to approach the electrode assembly 1 and is fixed to the outer peripheral surface of the case 3 corresponding to the cap assembly 2 protruding into the open end.
The housing blank of this embodiment comprises two adjacent free end portions which are sealingly abutted to form a sealed abutment 31. A bending stress is applied to the sealing land 31 so that the sealing land 31 is bent in a direction approaching the electrode assembly 1 and fixed to the outer circumferential surface of the case 3. The outer peripheral surface on the housing 3 refers to an outer surface area of the housing 3 corresponding to the top cover plate 21 protruding into the open end. In one example, the sealing interface 31 is connected to the outer peripheral surface of the housing 3 by heat fusion. Thus, the sealed abutting portion 31 occupies a small space, so that the overall structure of the secondary battery is more compact, which is advantageous for improving the energy density. After the bending operation of the sealing abutting part 31 is completed, the sealing connection operation of the shell 3 and the top cover plate 21 is easily performed, and meanwhile, a good sealing state is effectively ensured between the area, close to the sealing abutting part 31, on the shell 3 and the top cover plate 21.
In the encapsulating step of the above embodiment, the case 3 and the cap assembly 2 are hermetically connected by heat fusion. In one embodiment, the cap assembly 2 includes a cap plate 21 and an electrode terminal. The shell 3 and the top cover plate 21 are hermetically connected in a hot melting mode. In the present embodiment, when the housing 3 and the top cover plate 21 are connected by hot melting, they are melted by heating, and the melted portions of the two are penetrated and bonded to each other. After the temperature is lowered, the melted portion is solidified and hardened, thereby forming a good sealing area between the housing 3 and the top cover plate 21. Meanwhile, no extra material (such as adhesive glue or other adhesives) is needed to be used for sealing between the shell 3 and the top cover plate 21, and the processing and manufacturing difficulty and the processing cost are reduced. Therefore, the mode of sealing and connecting the shell 3 and the top cover plate 21 by adopting a hot melting mode ensures that the sealing state between the shell 3 and the top cover plate 21 is stable and reliable, and the operation is simple and efficient. In one example, the heat fusing may be laser welding, infrared welding, or heat sealing.
While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.
Claims (12)
1. A secondary battery, characterized by comprising:
an electrode assembly (1) having two ends opposing in a height direction (X);
the number of the top cover assemblies (2) is two, and the two top cover assemblies (2) are respectively arranged at the two ends of the electrode assembly (1);
a case (3), the case (3) covering the electrode assembly (1), the case (3) having two open ends opposite in the height direction (X), the two open ends being hermetically connected to the two cap assemblies (2), respectively, to form a sealed space accommodating the electrode assembly (1), the case (3) including a hermetically sealed butt portion (31) extending from one of the cap assemblies (2) to the other cap assembly (2) in the height direction (X);
the shell (3) is a flexible structure with elasticity and plasticity;
the shell (3) comprises free end parts, and the adjacent two free end parts are connected and fixed after being stretched towards the direction far away from the electrode assembly (1) to form the sealing butt part (31), so that the shell (3) is tightly attached to the top cover assembly (2).
2. The secondary battery according to claim 1, wherein the top cap assembly (2) includes a top cap plate (21), the top cap plate (21) protruding into the open end and being sealingly connected to the case (3), the top cap plate (21) including two free ends opposed in a length direction; the sealing abutment (31) extends from the free end of one of the cover plates (21) towards the free end of the other cover plate (21).
3. The secondary battery according to claim 2, wherein the number of the sealing and butting portions (31) is one, the case is formed by wrapping the electrode assembly (1) with one sheet in a circumferential direction of the electrode assembly (1), and both edges of the sheet are stacked on one side of the electrode assembly (1) and sealed to form the sealing and butting portions (31) of a stacked structure.
4. The secondary battery according to claim 2, wherein the number of the sealed and butted portions (31) is two, the case (3) is formed by snap-connecting two sheets to sandwich the electrode assembly (1), two edges of one sheet are stacked corresponding to two edges of the other sheet, respectively, and are sealed to form the two sealed and butted portions (31), and the two sealed and butted portions (31) are located on opposite sides of the electrode assembly (1) in the longitudinal direction (Y).
5. The secondary battery according to claim 3 or 4, wherein the electrode assembly (1) has a flat structure, the outer circumferential surface of the electrode assembly (1) includes two wide surfaces (1a) opposing in a width direction (Z) and two narrow surfaces (1b) opposing in the length direction (Y), and the sealing interface (31) is provided corresponding to the narrow surfaces (1 b).
6. The secondary battery according to claim 5, wherein the narrow face (1b) is an arc face, and the seal butting portion (31) is provided corresponding to a central position of the narrow face (1 b).
7. The secondary battery according to any one of claims 2 to 4, wherein the housing (3) and the top cover plate (21) are made of plastic.
8. The secondary battery according to any one of claims 2 to 4, wherein the sealed docking portion (31) is bent in a direction close to the electrode assembly (31) and fixed to an outer circumferential surface of the case (3) corresponding to the top cap plate (21) protruding into the open end.
9. A method of manufacturing a secondary battery, comprising the steps of:
an assembling step of providing an electrode assembly (1) and two cap assemblies (2), wherein the two cap assemblies (2) are respectively arranged at two opposite ends of the electrode assembly (1) along the height direction (X);
a packaging step of packaging the electrode assembly (1) with a case (3), the case (3) being formed by wrapping and packaging the electrode assembly (1) with a sheet, the sheet being packaged to form a sealed joint portion (31) extending from one of the cap assemblies (2) to the other cap assembly (2) in the height direction (X), the case (3) having two open ends opposing in the height direction (X), the two open ends being respectively connected to the two cap assemblies (2) in a sealed manner to form a sealed space for accommodating the electrode assembly (1);
the shell (3) is a flexible structure with elasticity and plasticity;
the shell (3) comprises free end parts, and the adjacent two free end parts are connected and fixed after being stretched towards the direction far away from the electrode assembly (1) to form the sealing butt part (31), so that the shell (3) is tightly attached to the top cover assembly (2).
10. The manufacturing method according to claim 9, wherein, in the encapsulating step,
the case (3) is formed by wrapping the electrode assembly (1) with a sheet in the circumferential direction of the electrode assembly (1), both edges of the sheet being laminated on one side of the electrode assembly (1) and sealed to form the seal-butted portion (31) of a laminated structure; or,
the case (3) is formed by buckling and connecting two sheets to sandwich the electrode assembly (1), two edges of one sheet are respectively laminated with two edges of the other sheet correspondingly and sealed to form two sealed butt joint parts (31), and the two sealed butt joint parts (31) are positioned on two opposite sides of the electrode assembly (1) in the length direction (Y).
11. The manufacturing method according to claim 9 or 10, characterized in that after the encapsulating step, the manufacturing method further comprises:
and the sealing butt joint part (31) is bent towards the direction close to the electrode assembly (1) and is fixed with the outer peripheral surface of the shell (3) corresponding to the top cover assembly (2) extending into the opening end.
12. The manufacturing method according to claim 9, wherein in the encapsulating step, the case (3) is hermetically connected to the cap assembly (2) by heat fusion.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
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| CN201810252349.2A CN110364643B (en) | 2018-03-26 | 2018-03-26 | Secondary battery and method for manufacturing secondary battery |
| PCT/CN2018/087084 WO2019184060A1 (en) | 2018-03-26 | 2018-05-16 | Secondary battery and method for manufacturing same |
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| CN201810252349.2A CN110364643B (en) | 2018-03-26 | 2018-03-26 | Secondary battery and method for manufacturing secondary battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064309A (en) * | 2009-11-16 | 2011-05-18 | 三星Sdi株式会社 | Lithium polymer secondary battery |
| CN204927359U (en) * | 2015-09-24 | 2015-12-30 | 宁德时代新能源科技有限公司 | Insulation shell structure and adopt lithium ion power batteries of this insulation shell structure |
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| KR100846972B1 (en) * | 2007-01-10 | 2008-07-17 | 삼성에스디아이 주식회사 | Hardcase for secondary battery and secondary battery using it |
| KR100864887B1 (en) * | 2007-05-25 | 2008-10-22 | 삼성에스디아이 주식회사 | Secondary battery |
| KR101042766B1 (en) * | 2009-02-05 | 2011-06-20 | 삼성에스디아이 주식회사 | Battery pack and manufacturing method the same |
| US20110039128A1 (en) * | 2009-08-11 | 2011-02-17 | Samsung Sdi Co., Ltd. | Battery pack and method of manufacturing the same |
| KR20110053835A (en) * | 2009-11-16 | 2011-05-24 | 삼성에스디아이 주식회사 | Lithium polymer secondary battery |
| JP2016139494A (en) * | 2015-01-26 | 2016-08-04 | トヨタ自動車株式会社 | Laminated battery |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102064309A (en) * | 2009-11-16 | 2011-05-18 | 三星Sdi株式会社 | Lithium polymer secondary battery |
| CN204927359U (en) * | 2015-09-24 | 2015-12-30 | 宁德时代新能源科技有限公司 | Insulation shell structure and adopt lithium ion power batteries of this insulation shell structure |
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| WO2019184060A1 (en) | 2019-10-03 |
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