CN115347287A - Battery top cover, battery and battery manufacturing method - Google Patents

Battery top cover, battery and battery manufacturing method Download PDF

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Publication number
CN115347287A
CN115347287A CN202211072745.XA CN202211072745A CN115347287A CN 115347287 A CN115347287 A CN 115347287A CN 202211072745 A CN202211072745 A CN 202211072745A CN 115347287 A CN115347287 A CN 115347287A
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CN
China
Prior art keywords
battery
top cover
insulating
piece
bus bar
Prior art date
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Granted
Application number
CN202211072745.XA
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Chinese (zh)
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CN115347287B (en
Inventor
娄豫皖
和祥运
万生辉
王卡
陈海廷
丁丽平
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Ningxia Baofeng Yuneng Technology Co Ltd
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Ningxia Baofeng Yuneng Technology Co Ltd
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Priority to CN202211072745.XA priority Critical patent/CN115347287B/en
Publication of CN115347287A publication Critical patent/CN115347287A/en
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Publication of CN115347287B publication Critical patent/CN115347287B/en
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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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/052—Li-accumulators
    • H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/05—Accumulators with non-aqueous electrolyte
    • H01M10/058—Construction or manufacture
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/183—Sealing members
    • H01M50/184—Sealing members characterised by their shape or structure
    • 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
    • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
    • H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
    • 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
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/586—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries inside the batteries, e.g. incorrect connections of electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/572—Means for preventing undesired use or discharge
    • H01M50/584—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries
    • H01M50/59—Means for preventing undesired use or discharge for preventing incorrect connections inside or outside the batteries characterised by the protection means
    • H01M50/593—Spacers; Insulating plates
    • 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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  • Chemical & Material Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Electrochemistry (AREA)
  • General Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The invention discloses a battery top cover, a battery and a battery manufacturing method. This battery top cap includes the top cap piece, converges piece, sealed lid and insulating seal assembly, is equipped with the cooperation and perforates on the top cap piece, converges and wears to establish in the cooperation perforation, and converges and have the perforation of converging, converges and link to each other with the utmost point ear of electric core, and sealed cover welding converges and perforates in the one end that the piece stretches out the top cap piece and seal of converging, and insulating seal assembly wears to establish in the cooperation perforation and overlaps and establish on converging to it is insulating with the top cap piece to converge. This battery top cap can be connected with the utmost point ear of electric core in the outside of the casing of battery, has simplified the connection technology of battery top cap with electric core, has promoted the connection stability of battery top cap with electric core utmost point ear to be favorable to promoting the reliability of battery.

Description

Battery top cover, battery and battery manufacturing method
Technical Field
The invention relates to the technical field of battery equipment, in particular to a battery top cover, a battery and a battery manufacturing method.
Background
As a driving energy source, the lithium ion battery is widely applied to new energy vehicles and energy storage, and at present, the square battery has high efficiency during system integration, larger monomer capacity than that of a cylindrical battery and a soft package battery, and higher cost performance, so the occupation ratio of the square battery in the fields of new energy vehicles and energy storage is up to more than 80%, and the square battery is an open key point in competition of various enterprises.
Square battery among the prior art is mostly the top cap structure of moulding plastics, and utmost point post bottom is provided with the switching piece of connecting utmost point ear. The leakproofness of square battery top cap has directly decided power battery's security performance and life, the sealing mode that adopts the nut to screw or the riveting mode compresses tightly more between current square battery top cap and the utmost point post, this kind of sealing mode's fastening is poor and the operation is complicated, in the transportation of battery, vibrations and the charging and discharging in-process can appear not hard up phenomenon often, thereby cause the sealed inefficacy of battery top cap, and arouse revealing of electrolyte, and then cause battery short circuit or capacity decay, make battery life shorten or unable normal use, and there is very big potential safety hazard.
Disclosure of Invention
The first objective of the present invention is to provide a battery top cover, which can be connected to the tabs of the battery core at the outer side of the casing of the battery, so as to simplify the connection process between the battery top cover and the battery core, and improve the connection stability between the battery top cover and the tabs of the battery core, thereby facilitating the improvement of the reliability of the battery.
The second objective of the present invention is to provide a battery, in which the connection between the battery top cover and the tab of the battery core is convenient, and the connection strength is high, so as to improve the battery assembly efficiency and the use reliability of the battery.
The third objective of the present invention is to provide a method for manufacturing a battery, which has high production efficiency, and is not easy to cause the welding slag to fall into the case during the assembly process, thereby improving the manufacturing yield.
In order to realize the technical effects, the technical scheme of the invention is as follows:
the invention discloses a battery top cover, comprising: the top cover plate is provided with a matching perforation; the confluence piece is arranged in the matching through hole in a penetrating mode and provided with a confluence through hole, and the confluence piece is connected with a lug of the battery cell; the sealing cover is welded at one end, extending out of the top cover plate, of the confluence piece and located on the outer side of the shell, and is used for sealing the confluence through hole; and the insulating sealing assembly is arranged in the matching through hole in a penetrating way and sleeved on the confluence piece so as to insulate and seal the confluence piece and the top cover plate.
In some embodiments, the battery top cover further includes an adaptor, the adaptor is inserted into the through hole for collecting current, and one end of the adaptor is connected to the tab of the battery cell, and the other end of the adaptor is connected to the sealing cover.
In some specific embodiments, the bus bar has a first step surface, the adaptor includes a first connecting portion and a second connecting portion, the first connecting portion is inserted into the bus bar through hole, one end of the first connecting portion is connected to the second connecting portion, the other end of the first connecting portion is connected to the tab, and the second connecting portion is welded to the first step surface.
In some embodiments, the manifold has a second stepped surface, and the seal cap is welded to the second stepped surface.
In some embodiments, the insulation seal assembly comprises: the first insulating sealing gasket is stopped against the upper surface of the top cover plate, and an accommodating groove matched with the confluence piece is formed in the first insulating sealing gasket; the second insulating sealing gasket comprises a sleeving part and a stopping part, the sleeving part is matched in the matching through hole and sleeved on the confluence piece, and the stopping part is stopped and stopped at the lower surface of the top cover plate.
In some embodiments, the bus bar comprises a penetrating portion, the penetrating portion is fitted in the sleeve portion, and an extrusion flanging formed by bending the lower end of the penetrating portion can extrude the stopping portion.
The invention also discloses a battery, comprising: the device comprises a shell, a first fixing piece and a second fixing piece, wherein two ends of the shell are arranged in an open manner; the battery top covers are two, and are respectively welded at two open ends of the shell; the battery comprises a battery cell, wherein the battery cell is matched in the shell, the two ends of the battery cell are respectively provided with a lug, and each lug is connected with the sealing cover of one battery top cover.
In some embodiments, the battery further comprises an insulating clamping plate assembly, the insulating clamping plate assembly comprises a first insulating clamping plate and a second insulating clamping plate, the first insulating clamping plate and the second insulating clamping plate are connected in a clamping mode, and the first insulating clamping plate and the second insulating clamping plate define a clamping groove for clamping the pole lug after being clamped.
The invention also discloses a battery manufacturing method for manufacturing the battery, and the battery manufacturing method comprises the following steps: assembling the top cover plate, the confluence piece and the insulating sealing assembly into a top cover semi-finished product; welding a lug at one end of the battery cell on the confluence piece; the battery cell is arranged in a shell, and the other end of the battery cell is sleeved with the top cover semi-finished product; welding the semi-finished top cover at the open end of the shell; welding a lug at the other end of the battery cell on the confluence piece; welding a sealing cover on the bus bar.
In some embodiments, adapters are welded to both tabs of the battery cell, and the adapters are welded to the bus bar.
The battery top cover has the beneficial effects that: because the piece that converges has to converge the perforation and can supply the utmost point ear of electric core to pass and link to each other with the piece that converges, and sealed lid welding is converged the piece and is stretched out the one end of top cap piece and seal and converge the perforation, like this at actual assembly in-process, can connect the utmost point ear of electric core on the piece that converges earlier, then with top cap piece and casing welding, at last sealed lid with converge the piece welding can. Welding utmost point ear and piece that converges can be gone on in the outside of casing, and the top cap piece also goes on in the outside of casing with the casing welding, and the welding of sealed lid and piece that converges is still gone on in the outside of casing, has avoided the adverse effect to battery inside among the welding process to adopt the piece that converges as utmost point ear and the intermediate junction structure of sealed lid, can promote connection stability betterly, promote the reliability of battery top cap, thereby promote the reliability of battery.
The battery of the invention has the following beneficial effects: because the battery top cover has the advantages that the battery top cover of the battery is convenient to connect with the pole lugs of the battery core, and the connection strength is high, so that the battery assembly efficiency and the use reliability of the battery are improved.
The battery manufacturing method of the invention has the following beneficial effects: because in the assembling process, connect the utmost point ear of the one end of electric core on the piece that converges earlier, then pack the casing into with electric core to with the top cap semi-manufactured goods of the other end suit of electric core by top cap piece, piece and the insulating seal assembly equipment that converges, then with top cap piece and casing welding and with the utmost point ear welding of the other end of electric core on the piece that converges, at last with sealed lid and converge the piece welding can. Welding utmost point ear and piece that converges can be gone on in the outside of casing, and the top cap piece also goes on in the outside of casing with the casing welding, and the welding of sealed lid and piece that converges is still gone on in the outside of casing, has avoided the adverse effect to battery inside among the welding process to manufacturing yield has been promoted, and because the welding all goes on in the outside, made things convenient for welding process, promoted manufacturing efficiency.
Additional aspects and advantages of the invention will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the invention.
Drawings
Fig. 1 is a schematic structural diagram of a top cover of a positive electrode battery according to a first embodiment of the invention;
fig. 2 is an exploded view of a top cover of a positive electrode battery according to a first embodiment of the present invention;
FIG. 3 is a schematic structural diagram of a top cover plate of a positive electrode according to a first embodiment of the present invention;
fig. 4 is a schematic structural diagram of a top cover of a negative electrode battery according to a first embodiment of the invention;
fig. 5 is an exploded view of a top cover of a negative electrode battery according to a first embodiment of the present invention;
fig. 6 is a schematic structural diagram of a negative electrode top cover sheet according to a first embodiment of the present invention;
fig. 7 is an unfolded schematic structural view of the bus bar according to the first embodiment of the present invention;
fig. 8 is a schematic structural view of a bus bar member after being bent according to a first embodiment of the present invention;
FIG. 9 is a schematic view of a seal cap according to a first embodiment of the present invention;
fig. 10 is a schematic structural view of a first insulating gasket according to a first embodiment of the present invention;
FIG. 11 is a schematic structural view of a second insulating gasket according to a first embodiment of the present invention;
fig. 12 is a partial schematic view of a matching structure of a battery top cover, a battery core and a battery case according to a first embodiment of the invention;
fig. 13 is a schematic structural view of a top cover of a positive electrode battery according to a second embodiment of the present invention;
fig. 14 is a schematic structural view of a top cover of a negative electrode battery according to a second embodiment of the present invention;
fig. 15 is a schematic structural view of an adaptor according to a second embodiment of the invention;
fig. 16 is a partial schematic view of a matching structure of a battery top cover, a battery core and a battery case according to a second embodiment of the invention;
fig. 17 is a partial schematic view of a matching structure of a battery top cover, a battery core and a battery case according to a third embodiment of the present invention;
fig. 18 is a partial schematic view of a matching structure of a battery top cover, a battery core and a battery case according to a fourth embodiment of the invention;
fig. 19 is a schematic structural view of a battery according to a fifth embodiment of the invention;
fig. 20 is an exploded view schematically illustrating a battery according to a fifth embodiment of the present invention;
fig. 21 is a schematic structural view of a battery cell and an insulating clamp plate assembly according to a fifth embodiment of the present invention;
FIG. 22 is a schematic structural view of an insulating cleat assembly according to a fifth embodiment of the invention;
fig. 23 is a schematic structural view of a battery according to a sixth embodiment of the present invention.
Reference numerals are as follows:
1. a top cover sheet; 11. matching with the through hole; 12. an explosion-proof valve; 13. injecting a sealing sheet; 14. mounting grooves; 2. a bus bar; 21. a confluence through hole; 22. a first step surface; 23. a second step surface; 24. a penetration part; 3. a sealing cover; 31. welding a terminal; 4. a first insulating gasket; 41. accommodating grooves; 5. a second insulating gasket; 51. a socket joint part; 52. a stopping part; 6. an adaptor; 61. a first connection portion; 62. a second connecting portion; 7. a housing; 8. an electric core; 81. a tab; 9. a first insulating clamp plate; 10. a second insulating clamp plate; 20. and an insulating sleeve.
Detailed Description
In order to make the technical problems solved, the technical solutions adopted and the technical effects achieved by the present invention clearer, the technical solutions of the present invention are further described below by way of specific embodiments with reference to the accompanying drawings.
In the description of the present invention, it is to be understood that the terms "central," "longitudinal," "transverse," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used in the orientations and positional relationships indicated in the drawings for convenience in describing the invention and to simplify the description, but are not intended to indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and are not to be construed as limiting the invention.
In addition, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature for distinguishing between descriptive features, non-sequential, and non-trivial. In the description of the present invention, "a plurality" means two or more unless otherwise specified.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.
The specific structure of the battery top cap according to the embodiment of the present invention will be described with reference to fig. 1 to 18.
The invention discloses a battery top cover, as shown in fig. 1-2, the battery top cover of the embodiment comprises a top cover plate 1, a confluence piece 2, a sealing cover 3 and an insulating sealing assembly, wherein a matching through hole 11 is arranged on the top cover plate 1, the confluence piece 2 is arranged in the matching through hole 11 in a penetrating manner, the confluence piece 2 is provided with a confluence through hole 21, the confluence piece 21 is connected with a lug 81 of an electric core 8, the sealing cover 3 is welded at one end of the confluence piece 2, which extends out of the top cover plate 1 and is positioned at the outer side of a shell 7, and the sealing cover 3 is used for sealing the confluence through hole 21. The sealing cover 3 is welded at one end of the confluence piece 2 extending out of the top cover plate 1 and seals the confluence through hole 21, and the insulating sealing assembly is arranged in the matching through hole 11 in a penetrating mode and sleeved on the confluence piece 2 so as to insulate the confluence piece 2 from the top cover plate 1.
It will be appreciated that in actual use, the top cover sheet 1 needs to be attached to the battery casing 7 and welded to the open end of the casing 7. In the embodiment, the bus bar 2 has a bus bar through hole 21 through which the tab 81 of the battery cell 8 can pass and is connected to the bus bar 2, and the sealing cover 3 is welded to one end of the bus bar 2 extending out of the top cover plate 1 and closes the bus bar through hole 21, so that in an actual assembly process, the tab 81 of the battery cell 8 can be firstly connected to the bus bar 2, then the top cover plate 1 is welded to the housing 7, and finally the sealing cover 3 is welded to the bus bar 2. Welding utmost point ear 81 and piece 2 that converges can go on in the outside of casing 7, top cap piece 1 also goes on in the outside of casing 7 with casing 7 welding, sealed lid 3 still goes on in the outside of casing 7 with the welding of piece 2 that converges, the adverse effect to the battery inside in the welding process has been avoided, and in this embodiment, utmost point ear 81 passes and converges perforation 21 and link to each other with piece 2 that converges, sealed lid 3 and the welding of piece 2 that converges, adopt and converge piece 2 as utmost point ear 81 and sealed intermediate junction structure who covers 3, can promote connection stability betterly, promote the reliability of battery top cap, thereby promote the reliability of battery.
Here, the battery top cover is provided with an explosion-proof valve 12, a liquid inlet hole, and a liquid sealing sheet 13 for closing the liquid inlet hole. In practice, the battery top cover comprises a positive battery top cover and a negative battery top cover, and in some embodiments, the explosion-proof valve 12, the liquid injection hole and the liquid injection sealing sheet 13 are all arranged on the top cover sheet 1 of the positive battery top cover; in some embodiments, the explosion-proof valve 12, the liquid injection hole and the liquid injection sealing sheet 13 are arranged on the top cover sheet 1 of the top cover of the negative electrode battery; in some embodiments, the explosion-proof valve 12 is arranged on the top cover sheet 1 of the top cover of the positive battery, and the liquid injection hole and the liquid injection sealing sheet 13 are arranged on the top cover sheet 1 of the top cover of the negative battery; in some embodiments, the explosion-proof valve 12 is arranged on the top cover sheet 1 of the top cover of the negative electrode battery, and the liquid injection hole and the liquid injection sealing sheet 13 are arranged on the top cover sheet 1 of the top cover of the positive electrode battery. In the actual manufacturing process, the arrangement positions of the explosion-proof valve 12, the liquid injection hole and the liquid injection sealing sheet 13 can be selected according to the actual requirements of the battery.
It should be added that, in the current square battery top cover, when the width of the injection molded battery top cover is small, the pole in the battery top cover is generally cylindrical, the overcurrent capacity is small, and the area of the welding row is too small when the module is formed, which is not beneficial to the welding assembly of the battery top cover and the subsequent use of the battery. In the embodiment, the pole structure is omitted, the sealing cover 3 welded on the confluence piece 2 is used as a welding structure, the overcurrent capacity is good, the welding with an external wiring is convenient, and the subsequent use of the battery is convenient.
In addition, the material for manufacturing the current collecting piece 2 and the sealing cover 3 of the top cover of the negative electrode battery can be one of nickel-plated carbon steel, copper alloy and aluminum alloy according to actual needs, and the specific material is determined by the type of the battery. Such as sodium ion batteries and lithium titanate batteries, the material of the lithium ion batteries is aluminum alloy; for example, the lithium ion battery with graphite as the negative electrode is made of one of nickel-plated carbon steel or copper alloy. The bus bar 2 and the sealing cap 3 of the positive cell top cap may preferably be aluminum alloy.
In some embodiments, as shown in fig. 13 to 16, the battery top cover further includes an adaptor 6, the adaptor 6 is inserted into the bus perforation hole 21, and one end of the adaptor 6 is connected to the tab 81 of the battery cell 8 and the other end is connected to the sealing cover 3. It can be understood that, according to the foregoing, the connection process requires the tab 81 to be connected to the bus bar 2 through the bus bar penetration hole 21, which is not suitable for the battery cell 8 with the tab 81 having a smaller length, thereby limiting the applicability of the battery top cover of the present embodiment. In this embodiment, the battery top cover further includes an adaptor 6, and the adaptor 6 can be inserted into the through hole 21 and serves as an adaptor structure between the tab 81 of the battery cell 8 and the bus bar 2, so that the battery top cover can be better suitable for the tab 81 with a shorter length, and the application range of the battery top cover of this embodiment is expanded.
It should be noted that the adaptor 6 of the negative battery top cover may be one of nickel-plated carbon steel, copper alloy and aluminum alloy according to actual requirements, and the specific material is determined by the battery type. Such as sodium ion batteries and lithium titanate batteries, the material of which is aluminum alloy; for example, the lithium ion battery with graphite as the negative electrode is made of one of nickel-plated carbon steel or copper alloy. The adaptor 6 of the positive battery top cap may preferably be an aluminum alloy.
In some specific embodiments, as shown in fig. 8, the bus bar 2 has a first step surface 22, the adaptor 6 includes a first connecting portion 61 and a second connecting portion 62, the first connecting portion 61 is inserted into the bus bar through hole 21, one end of the first connecting portion 61 is connected to the second connecting portion 62, the other end is connected to the tab 81, and the second connecting portion 62 is welded to the first step surface 22. It can be understood that, the adaptor 6 is used as a connecting structure between the bus bar 2 and the tab 81, and both the width and the thickness can be selected according to actual requirements, so that the overcurrent capacity of the battery can be improved. Be equipped with first step face 22 on the piece 2 that converges, weld second connecting portion 62 on first step face 22, on the one hand make things convenient for the welding, promote battery top cap's packaging efficiency, on the other hand can increase the connection area of first step face 22 and second connecting portion 62 to promote the connection stability of piece 2 and second connecting portion 62 that converges.
In some embodiments, as shown in fig. 17-18, two bus bars 2, two insulating seal assemblies and two sealing caps 3 are provided on the top cover sheet 1, and the top cover sheet 1 is connected to two battery cells 8 at the same time. Therefore, the battery top cover of the embodiment can also be used in batteries with multiple battery cores 8 in parallel, and the compatibility of the battery top cover is further expanded.
In some embodiments, as shown in fig. 7, the bus bar 2 has a second stepped surface 23, and the sealing cap 3 is welded on the second stepped surface 23. It can be understood that, welding the sealing cover 3 on the second step surface 23 of the confluence piece 2 facilitates welding on the one hand, and can avoid the phenomenon that welding slag falls in the welding process, and can increase the connection area of the confluence piece 2 and the sealing cover 3 on the other hand, thereby improving the connection stability and connection sealing performance of the confluence piece 2 and the sealing cover 3.
In some embodiments, as shown in fig. 2, the insulating sealing assembly includes a first insulating sealing gasket 4 and a second insulating sealing gasket 5, the first insulating sealing gasket 4 abuts against the upper surface of the top cover plate 1, as shown in fig. 10, the first insulating sealing gasket 4 is provided with a receiving groove 41 matched with the bus bar 2, as shown in fig. 11, the second insulating sealing gasket 5 includes a socket portion 51 and an abutting portion 52, the socket portion 51 is matched in the matching through hole 11 and sleeved on the bus bar 2, and the abutting portion 52 abuts against the lower surface of the top cover plate 1. It can be understood that, the first insulating sealing gasket 4 is clamped between the bus bar 2 and the upper surface of the top cover plate 1, so as to ensure that the bus bar 2 and the top cover plate 1 are arranged in an insulating manner, thereby avoiding the phenomenon that the housing 7 of the battery is short-circuited with the tab 81 of the battery cell 8. And the accommodating groove 41 is formed on the first insulating sealing gasket 4, so that the connection stability and the connection sealing property of the first insulating sealing gasket 4 and the bus bar 2 can be improved. The second insulating gasket 5 includes a socket portion 51 and a stopper portion 52, the socket portion 51 can ensure the sealing property and the insulating property of the connection between the bus bar 2 and the inner sidewall of the fitting through hole 11, and the stopper portion 52 can ensure the sealing property and the insulating property of the connection between the bus bar 2 and the lower surface of the top cover plate 1.
In some specific embodiments, as shown in fig. 8, the bus bar 2 includes a penetrating portion 24, the penetrating portion 24 is fitted in the sleeve portion 51, and an extrusion flange formed by bending a lower end of the penetrating portion 24 can extrude the stopping portion 52. It can be understood that wear to establish portion 24 and 51 interference fit of cup joint portion and can ensure the leakproofness of being connected of piece 2 and the sealed 5 of second insulating seal to wear to establish the lower extreme that adopts mechanical compression's mode to wear to establish portion 24 after finishing and bend the extrusion and stop portion 52, make the sealed 5 of second insulating seal take place to warp, can ensure like this to converge and connect the leakproofness between the inside wall of piece 2 and cooperation perforation 11, thereby avoided outside gas or foreign matter can pass the inside phenomenon of battery top cap entering casing 7 and take place.
It should be noted that, of course, in other embodiments of the present invention, the insulating sealing assembly may also be formed as an insulating gasket, which is disposed on the bus bar 2 and has two flanges, one of which abuts against the upper surface of the top cover plate 1 and the other of which abuts against the lower surface of the top cover plate 1.
The first embodiment is as follows:
as shown in fig. 1 to 12, the battery top cap of the present embodiment includes a top cover plate 1, a confluence piece 2, a sealing cover 3 and an insulating sealing assembly, a matching perforation 11 and a mounting groove 14 are provided on the top cover plate 1, the insulating sealing assembly includes a first insulating sealing gasket 4 and a second insulating sealing gasket 5, the first insulating sealing gasket 4 abuts against the upper surface of the top cover plate 1 and fits in the mounting groove 14, and a receiving groove 41 is provided on the first insulating sealing gasket 4, the second insulating sealing gasket 5 includes a socket portion 51 and an abutting portion 52, the socket portion 51 fits in the matching perforation 11, and the abutting portion 52 abuts against the lower surface of the top cover plate 1. The bus bar 2 has a bus bar through hole 21, a first step surface 22, a second step surface 23, and a penetrating portion 24, the penetrating portion 24 is fitted in the sleeve portion 51, and an extrusion flange formed by bending the lower end of the penetrating portion 24 can extrude the abutting portion 52. The upper end of the bus bar 2 is fitted in the receiving groove 41, the sealing cover 3 is welded to the second stepped surface 23, and the tab 81 of the battery cell 8 is welded to the first stepped surface 22 through the bus through hole 21. Two welding terminals 31 are provided on the sealing cover 3, and the welding terminals 31 are used for welding external wirings.
The second embodiment:
as shown in fig. 13 to 16, the battery top cover of the present embodiment has substantially the same structure as that of the first embodiment, except that the battery top cover further includes an adaptor 6, the adaptor 6 includes a first connecting portion 61 and a second connecting portion 62, the first connecting portion 61 is inserted into the through hole 21, one end of the first connecting portion 61 is connected to the second connecting portion 62, the other end is connected to the tab 81, and the second connecting portion 62 is welded to the first step surface 22.
Example three:
as shown in fig. 17, the battery top cover of the present embodiment has substantially the same structure as that of the first embodiment, except that the battery top cover of the present embodiment is connected to the tabs 81 of two battery cells 8 at the same time.
Example four:
as shown in fig. 18, the battery top cover of the present embodiment has substantially the same structure as that of the second embodiment, except that one battery top cover of the present embodiment is connected to the tabs 81 of two battery cells 8 through two adapters 6.
The specific structure of the battery according to the embodiment of the invention is described below with reference to fig. 19 to 22.
The invention also discloses a battery, as shown in fig. 19-22, the battery of this embodiment includes a casing 7, two battery top covers and a battery cell 8, two ends of the casing 7 are open, the two battery top covers are respectively welded at two open ends of the casing 7, the battery cell 8 is fitted in the casing 7, two ends of the battery cell 8 are respectively provided with a tab 81, and each tab 81 is connected with the sealing cover 3 of one battery top cover.
Due to the adoption of the battery top cover, the battery top cover of the battery is conveniently connected with the lug 81 of the battery core 8, and the connection strength is high, so that the battery assembly efficiency and the use reliability of the battery are improved.
In some embodiments, the battery further comprises an insulating clamping plate assembly, the insulating clamping plate assembly comprises a first insulating clamping plate 9 and a second insulating clamping plate 10, the first insulating clamping plate 9 and the second insulating clamping plate 10 are clamped and connected, and the first insulating clamping plate 9 and the second insulating clamping plate 10 define a clamping groove for clamping the tab 81 after being clamped and connected. It can be understood that, according to the foregoing, the tab 81 of the battery cell 8 either directly passes through the bus bar 2 and is welded on the first step surface 22 of the bus bar 2, or is welded with the first connecting portion 61 of the adaptor 6, and the provided insulating clamping plate assembly can ensure that the tab 81 of the battery cell 8 is in a relatively flat state, so as to facilitate welding, or the insulating clamping plate assembly can clamp the connecting portion between the bus bar 2 and the adaptor 6, so as to improve the connection stability between the adaptor 6 and the tab 81.
Example five:
as shown in fig. 19 to 22, the battery of the present embodiment includes a housing 7, a battery top cover, a battery core 8, an insulating clamping plate assembly, and an insulating sleeve 20. The both ends of casing 7 open the setting, and the battery top cap is two, and welds respectively and open the end at two of casing 7, and electric core 8 establishes in casing 7, and is equipped with insulating cover 20 between electric core 8 and the casing 7. Insulating splint subassembly includes the insulating splint of first insulating splint 9 and second 10, and the insulating splint of first insulating splint 9 and second 10 joint are connected, and first insulating splint 9 and the insulating splint 10 joint of second back limit the centre gripping groove of centre gripping utmost point ear 81. It should be noted that the structure of the battery top cover of the present embodiment can be arbitrarily selected from the first and second embodiments.
Example six:
as shown in fig. 23, the battery of the present embodiment includes a case 7, a battery top cover, two battery cells 8 and two insulating clamping plate assemblies, where the number of the battery cells 8 is two, the number of the matching through holes 11 on one top cover plate 1 is two, and the number of the bus bar 2, the sealing cover 3 and the insulating sealing assemblies is two. The bus bar 2 of the present embodiment may be connected to the tab 81 of the battery cell 8 through the adaptor 6, or may be directly connected to the tab 81 of the battery cell 8.
The invention also discloses a battery manufacturing method, which comprises the following specific steps:
the first step is as follows: assembling the top cover plate 1, the confluence piece 2 and the insulating sealing assembly into a top cover semi-finished product;
particularly, put into the mounting groove 14 of top flap 1 with the first insulating sealing gasket 4 among the insulating seal assembly earlier, then establish second insulating sealing gasket 5 cover on the portion 24 of establishing that wears of the piece 2 that converges, then will have the piece 2 of converging of second insulating sealing gasket 5 to pass top flap 1 and first insulating sealing gasket 4, make the upper end of the piece 2 that converges extrude first insulating sealing gasket 4 in mounting groove 14, then will wear the lower extreme of portion 24 to carry out mechanical bending, the extrusion turn-ups that forms after bending extrudees the portion 52 of ending of second insulating sealing gasket 5, and will end portion 52 firmly to extrude on the lower surface of top flap 1.
The tab 81 of the battery cell 8 is welded to the bus bar 2 in two ways, and there are some differences in the battery assembling method according to the different ways of welding the tab 81 of the battery cell 8 to the bus bar 2, which will be described separately below.
The specific flow of the manner of directly welding the tab 81 of the battery cell 8 and the bus bar 2 is as follows:
the second step is that: directly welding a tab 81 of the battery cell 8 on the bus bar 2;
specifically, one tab 81 of the battery cell 8 is bent after passing through the bus bar through hole 21 of the bus bar 2, and the bent portion is laser-welded to the first step surface 22 of the bus bar 2;
the third step: welding the semi-finished top cover welded with the lug 81 to one open end of the shell 7;
specifically, the battery cell 8 is wrapped and fastened by using the insulating sleeve 20, then the battery cell 8 is placed in the shell 7, the semi-finished top cover is ensured to be abutted against one open end of the shell 7, and the periphery of the top cover plate 1 and the periphery of the open end of the shell 7 are hermetically welded by laser welding;
the fourth step: another semi-finished top cover is fastened to the other open end of the shell 7, and another tab 81 of the battery cell 8 is welded to the semi-finished top cover;
specifically, the other top cover semi-finished product is buckled on the other open end of the shell 7, the other tab 81 of the battery cell 8 is bent after passing through the bus through hole 21 of the bus piece 2, and the bent part is laser welded on the first step surface 22 of the bus piece 2;
the fifth step: welding another semi-finished top cover to the other open end of the shell 7;
specifically, the periphery of the top cover plate 1 and the periphery of the open end of the shell 7 are hermetically welded by laser welding;
and a sixth step: respectively welding the two sealing covers 3 on the two top cover pieces 1;
specifically, the sealing cover 3 is placed on the second step surface 23 of the top cover plate 1, and the periphery of the sealing cover 3 is hermetically welded with the second step surface 23;
the seventh step: and drying, injecting and forming the battery.
The specific process of adopting the adaptor 6 as the tab 81 of the battery cell 8 and the bus bar 2 to weld the rotating structure is as follows:
the second step is that: welding the two adapters 6 on two tabs 81 of the battery cell 8;
specifically, two strip-shaped adapters 6 are respectively welded on two tabs 81 of the battery cell 8, and then the welding positions of the tabs 81 and the adapters 6 are clamped by using a first insulating clamping plate 9 and a second insulating clamping plate 10;
the third step: welding one adapter piece 6 on the top cover semi-finished product;
specifically, the adaptor 6 is bent after passing through the bus bar through hole 21 of the bus bar 2, and the second connecting portion 62 formed by bending is laser-welded to the first step surface 22 of the bus bar 2;
the fourth step: welding the semi-finished top cover welded with the lug 81 to one open end of the shell 7;
specifically, the battery cell 8, the first insulating splint 9 and the second insulating splint 10 are wrapped and fastened by using an insulating sleeve 20, then the battery cell 8 is placed in the shell 7, a semi-finished top cover is ensured to abut against one open end of the shell 7, and the periphery of the top cover plate 1 and the periphery of the open end of the shell 7 are hermetically welded by laser welding;
the fifth step: another semi-finished top cover is buckled on the other open end of the shell 7, and another adapter piece 6 is welded on the semi-finished top cover;
specifically, the other semi-finished top cover is fastened to the other open end of the housing 7, the other adapter 6 is bent after passing through the bus through hole 21 of the bus bar 2, and the second connecting part 62 formed by bending is laser welded on the first step surface 22 of the bus bar 2;
the fifth step, the sixth step and the seventh step of the first method in the subsequent steps are the same, and are not described herein again.
It should be noted that, in the method for manufacturing the battery cell 8 of the present embodiment, the positive electrode sheet, the negative electrode sheet and the separator are alternately folded or wound into the battery cell 8 in a lamination or winding manner. One side of the battery cell 8 extends out of the tab 81 of the positive electrode from the positive current collector, and the other side extends out of the tab 81 of the negative electrode from the negative current collector.
Reference throughout this specification to "some embodiments," "other embodiments," or the like, means that a particular feature, structure, material, or characteristic described in connection with the embodiments or examples is included in at least one embodiment or example of the invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.
The above description is only a preferred embodiment of the present invention, and for those skilled in the art, the present invention should not be limited by the description of the present invention, which should be interpreted as a limitation.

Claims (10)

1. Battery top cap, its characterized in that includes:
the top cover plate is provided with a matching through hole and connected to a shell of the battery;
the confluence piece is arranged in the matching through hole in a penetrating mode and provided with a confluence through hole, and the confluence piece is connected with a lug of the battery cell;
the sealing cover is welded at one end, extending out of the top cover plate, of the confluence piece and located on the outer side of the shell, and is used for sealing the confluence through hole;
and the insulating sealing assembly is arranged in the matching through hole in a penetrating way and sleeved on the confluence piece so as to insulate and seal the confluence piece and the top cover plate.
2. The battery top cap of claim 1, further comprising an adaptor, wherein the adaptor is inserted into the through-hole, and one end of the adaptor is connected to the tab of the electrical core, and the other end of the adaptor is connected to the sealing cover.
3. The battery top cap of claim 2, wherein the bus bar has a first step surface, the adaptor comprises a first connecting portion and a second connecting portion, the first connecting portion is inserted into the bus bar through hole, one end of the first connecting portion is connected to the second connecting portion, the other end of the first connecting portion is connected to the tab, and the second connecting portion is welded to the first step surface.
4. The battery top cap of claim 1, wherein the bus bar has a second stepped surface, and the sealing cap is welded to the second stepped surface.
5. The battery top cap of claim 1, wherein the insulating seal assembly comprises:
the first insulating sealing gasket is stopped against the upper surface of the top cover plate, and an accommodating groove matched with the confluence piece is formed in the first insulating sealing gasket;
the second insulating sealing gasket comprises a sleeving part and a stopping part, the sleeving part is matched in the matching through hole and sleeved on the confluence piece, and the stopping part stops against the lower surface of the top cover piece.
6. The battery top cover according to claim 5, wherein the bus bar comprises a penetrating portion, the penetrating portion is fitted in the sheathing portion, and an extrusion flanging formed by bending the lower end of the penetrating portion can extrude the stopping portion.
7. A battery, comprising:
the device comprises a shell, a first fixing piece and a second fixing piece, wherein two ends of the shell are arranged in an open mode;
the battery top cap of any of claims 1-6, in two, welded at two open ends of the housing, respectively;
the battery comprises a battery cell, wherein the battery cell is matched in the shell, the two ends of the battery cell are respectively provided with a lug, and each lug is connected with the sealing cover of one battery top cover.
8. The battery of claim 7, further comprising an insulating clamping plate assembly, wherein the insulating clamping plate assembly comprises a first insulating clamping plate and a second insulating clamping plate, the first insulating clamping plate and the second insulating clamping plate are connected in a clamping mode, and clamping grooves for clamping the tabs are defined after the first insulating clamping plate and the second insulating clamping plate are clamped.
9. A battery manufacturing method for manufacturing the battery described in claim 7 or 8, and the battery manufacturing method includes:
assembling the top cover plate, the confluence piece and the insulating sealing assembly into a top cover semi-finished product;
welding a lug at one end of the battery cell on the confluence piece;
the battery core is arranged in the shell;
sleeving the other end of the battery cell with the semi-finished top cover;
welding the semi-finished top cover at the open end of the shell;
welding a lug at the other end of the battery cell on the confluence piece;
welding a sealing cover on the bus bar.
10. The battery manufacturing method according to claim 9, wherein an adaptor is welded to each of two tabs of the cell, and the adaptor is welded to the bus bar.
CN202211072745.XA 2022-09-02 2022-09-02 Battery top cover, battery and battery manufacturing method Active CN115347287B (en)

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CN113363674A (en) * 2021-07-02 2021-09-07 深圳市科达利实业股份有限公司 Cylindrical battery
CN114447525A (en) * 2022-01-28 2022-05-06 天津市捷威动力工业有限公司 Battery with bilateral lugs and assembling method thereof
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CN108054306A (en) * 2017-11-06 2018-05-18 惠州拓邦电气技术有限公司 Cover plate of power battery, using the cover board power battery and produce cover board method
CN207800665U (en) * 2018-02-01 2018-08-31 宁德时代新能源科技股份有限公司 The cap assembly and secondary cell of secondary cell
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