CN114744275A - Square battery and assembling method - Google Patents

Square battery and assembling method Download PDF

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Publication number
CN114744275A
CN114744275A CN202210486772.5A CN202210486772A CN114744275A CN 114744275 A CN114744275 A CN 114744275A CN 202210486772 A CN202210486772 A CN 202210486772A CN 114744275 A CN114744275 A CN 114744275A
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China
Prior art keywords
top cover
shell
aluminum sheet
cover assembly
bottom plate
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Pending
Application number
CN202210486772.5A
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Chinese (zh)
Inventor
刘峰
兑瀚
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Tianjin EV Energies Co Ltd
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Tianjin EV Energies Co Ltd
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Priority to CN202210486772.5A priority Critical patent/CN114744275A/en
Publication of CN114744275A publication Critical patent/CN114744275A/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
    • H01M50/102—Primary casings; Jackets or wrappings characterised by their shape or physical structure
    • H01M50/103—Primary casings; Jackets or wrappings characterised by their shape or physical structure prismatic or rectangular
    • 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
    • H01M10/0404—Machines for assembling batteries
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10—Primary casings; Jackets or wrappings
    • H01M50/116—Primary casings; Jackets or wrappings characterised by the material
    • H01M50/117—Inorganic material
    • H01M50/119—Metals
    • 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
    • H01M50/131—Primary casings; Jackets or wrappings characterised by physical properties, e.g. gas permeability, size or heat resistance
    • H01M50/133—Thickness
    • 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
    • H01M50/148—Lids or covers characterised by their shape
    • H01M50/15—Lids or covers characterised by their shape for prismatic or rectangular cells
    • 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
    • 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
    • H01M50/172—Arrangements of electric connectors penetrating the casing
    • H01M50/174—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells
    • H01M50/176—Arrangements of electric connectors penetrating the casing adapted for the shape of the cells for prismatic or rectangular cells
    • 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
    • H01M50/528—Fixed electrical connections, i.e. not intended for disconnection
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/533—Electrode connections inside a battery casing characterised by the shape of the leads or tabs
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/536—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
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/538—Connection of several leads or tabs of wound or folded electrode stacks
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • H01M50/54—Connection of several leads or tabs of plate-like electrode stacks, e.g. electrode pole straps or bridges
    • 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
    • H01M50/543—Terminals
    • H01M50/547—Terminals characterised by the disposition of the terminals on the cells
    • H01M50/548—Terminals characterised by the disposition of the terminals on the cells on opposite sides of the cell
    • 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
    • H01M50/543—Terminals
    • H01M50/552—Terminals characterised by their shape
    • H01M50/553—Terminals adapted for prismatic, pouch or rectangular cells
    • 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
    • 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)
  • Inorganic Chemistry (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The invention provides a square battery and an assembly method thereof, and the square battery comprises a shell, a core package, a first top cover assembly and a second top cover assembly, wherein one end of the shell is opened, the other end of the shell is provided with a bottom plate, a punched hole is arranged on the bottom plate, the core package, the first top cover assembly and the second top cover assembly are all arranged in the shell, two groups of lugs are arranged at two ends of the core package, the two groups of lugs are respectively welded with the first top cover assembly and the second top cover assembly in a one-to-one correspondence manner, the first top cover assembly is abutted against the inner wall of the bottom plate, and the second top cover assembly is hermetically connected with one end of the opening of the shell. The square battery does not need to cut off the whole bottom surface, so that the opening size of the shell can be ensured, the material utilization power in the preparation process of the stretching shell can be improved, the cost is further reduced, the top covers on two sides can enter the shell simultaneously, and the production efficiency is improved.

Description

Square battery and assembling method
Technical Field
The invention belongs to the field of power batteries, and particularly relates to a square battery and an assembly method.
Background
The square battery mainly has two kinds of technical scheme that the utmost point post is gone out to the homonymy and the utmost point post is gone out to both sides, the square battery that the utmost point post was gone out to both sides is usually longer, the core package needs earlier to carry out ultrasonic bonding with the switching piece of both sides in the production process, later the switching piece of one side carries out laser-beam welding with top cap utmost point post, utmost point ear is buckled and is wrapped up the core package insulating film on the core package main part, plastic and core package insulating film hot melt are fixed under the top cap of connecting utmost point ear earlier, opposite side core package insulating film or unsettled or hot melt are fixed on utmost point ear support, later the whole top cap of taking one side installation to accomplish of core package and the switching piece of opposite side go into the shell together, the top cap that the installation was accomplished and the shell mouth of aluminium hull carries out laser-beam welding, later the top cap of opposite side carries out laser-beam welding with the switching piece behind the utmost point ear, the aluminium hull mouth of top cap and the opposite side carries out laser-beam welding. The laser welding of top cap and aluminum hull has two kinds of schemes, as shown in fig. 4 and fig. 5, is side welding and top welding respectively, and the structural style of side welding is that the top cap is blocking on the aluminum hull, and the face of weld welds all around on the aluminum hull, and the structural style of top welding is that the aluminum hull lives the top cap parcel, and the face of weld is the rectangular welding of coplanar on the top cap.
According to the design scheme at the present stage, the switching sheet is in laser welding with the core cladding main body and then in laser welding with the pole column to complete the conduction of electric connection, and the process is complex. If the tab support is not added, the core cladding insulating film needs to be suspended at one side of the rear inlet shell and cannot be fixed, so that potential safety hazards are easily caused; if the tab support is added, a part of the space in the shell can be sacrificed, and the core package cannot be fully utilized. The battery cell aluminum shell of the single-side pole output column is formed through a stretching process, but the battery cell aluminum shell of the double-side pole output column is formed through the stretching process, so that the material on the bottom surface of the original base material needs to be cut off, and the material utilization rate is low; other forming processes such as extrusion forming cannot meet mass production because the size of a longer shell opening of the battery cell is difficult to guarantee and the service life of an extrusion die is short; the wall thickness of the aluminum shell formed by bending and welding is uniform, the requirements of structures such as an explosion-proof valve and a liquid injection hole on the narrow edge of the shell cannot be met, the stability of the aluminum shell formed by bending and welding is poor in the manufacturing process, and the yield is low. And the design scheme at the present stage needs two shell and top cover welding procedures, so that the production efficiency is lower. The technical scheme of the existing double-side pole-outgoing pole is low in efficiency and is not beneficial to the preparation of mass production products.
Disclosure of Invention
In view of this, the present invention is directed to a square battery and an assembling method thereof, so as to improve the installation efficiency of the square battery with two side pole output posts, reduce the installation difficulty, and improve the space utilization rate and the raw material utilization rate.
In order to achieve the purpose, the technical scheme of the invention is realized as follows:
a square battery comprises a shell, a core package, a first top cover assembly and a second top cover assembly, wherein one end of the shell is opened, the other end of the shell is provided with a bottom plate, a punched hole is arranged on the bottom plate, the core package, the first top cover assembly and the second top cover assembly are arranged in the shell, two groups of lugs are arranged at two ends of the core package and are respectively welded with the first top cover assembly and the second top cover assembly in a one-to-one correspondence mode, the first top cover assembly is hermetically connected with the inner wall of the bottom plate, the second top cover assembly is hermetically connected with one end of the shell opening, two ends of the shell and the two top cover assemblies respectively adopt different connection modes, the first top cover assembly is abutted against the bottom plate, the second top cover assembly is top-welded with the shell, compared with the installation mode in the prior art, the whole bottom surface of the shell is not required to be completely cut off, the size of the shell opening can be ensured, and the material utilization power in the preparation process of the stretching shell can also be improved, further reduce cost, can also realize that both sides top cap subassembly goes into the shell simultaneously, improve production efficiency, can also avoid the unsettled potential safety hazard that causes of core cladding insulating film and increase the occupation shell inner space that the supporting structure caused, further promote the security and the energy density of battery, in addition, stretch forming's two adjacent face wall thicknesses of casing can not be equal, two relative face wall thicknesses equal, the demand that can realize opening explosion-proof valve and annotate liquid hole isotructure on the casing is thick to the narrow face wall thickness.
Further, first top cap subassembly includes first plastic, first top cap aluminum sheet and first utmost point post, in the punching a hole on the first top cap aluminum sheet embedding bottom plate, first plastic offsets with the bottom plate inner wall, first top cap aluminum sheet stretches out from punching a hole on the bottom plate, be equipped with the through-hole on the first top cap aluminum sheet, first utmost point post is followed first top cap aluminum sheet the through-hole stretches out, and the size of first plastic slightly is less than the casing open-ended size, and is greater than the size that punches a hole, and the size of first top cap aluminum sheet cooperatees with the size that punches a hole, simple to operate.
Furthermore, the thickness of the first top cover aluminum sheet is the same as that of the bottom plate, and two side surfaces of the first top cover aluminum sheet in the thickness direction are flush with two side surfaces of the bottom plate in the thickness direction respectively.
Further, the shell and the bottom plate are integrally formed in a stretching mode.
Furthermore, the second top cover assembly comprises a second lower plastic, a second top cover aluminum sheet and a second pole, and the second top cover aluminum sheet is welded with one end of the opening of the shell.
Further, be equipped with the heavy groove that circumference set up on the inner wall of casing open-ended one end, second top cap aluminum sheet lateral wall be equipped with heavy groove complex ladder platform, the casing with the welding seam that second top cap aluminum sheet formed is located on the terminal surface of square battery one end, heavy groove and ladder platform cooperation are convenient for install the location, improve connection stability.
Furthermore, the core bag is wrapped by an insulating film, and the insulating film is in hot-melt connection with the first top cover assembly and the second top cover assembly respectively.
The present disclosure also provides an assembling method for assembling the above-mentioned prismatic battery, including the steps of:
s1, respectively welding the tab foils at the two ends of the core bag into a whole;
s2, welding a tab at one end of the core cladding with the first pole; the tab at the other end is welded with the second pole;
s3, bending the tabs at the two ends of the core bag, and wrapping an insulating film outside the core bag;
s4, penetrating the first lower plastic on the first pole and fixedly connecting the first lower plastic with one end of the insulating film; penetrating a second lower plastic on the second pole and fixedly connecting the second lower plastic with the other end of the insulating film;
s5, assembling the first top cover aluminum sheet and the first lower plastic, and assembling the second top cover aluminum sheet and the second lower plastic;
s6, extending one end of the core package, which is provided with a first top cover aluminum sheet, from the opening end of the shell, assembling the end of the core package, which is provided with the bottom plate, and welding the end at the joint; and assembling the other end of the core bag and one end of the opening of the shell, and welding the joint.
Compared with the prior art, the square battery has the following advantages:
(1) the square battery does not need to cut off the whole bottom surface, so that the opening size of the shell can be ensured, the material utilization power in the preparation process of the stretching shell can be improved, the cost is further reduced, the top covers on two sides can enter the shell simultaneously, and the production efficiency is improved;
(2) the square battery provided by the invention has the advantages that the use of the adapter sheet is omitted, the weight and the space of the square battery are further reduced, meanwhile, the potential safety hazard caused by hanging the core cladding insulating film in the air and the occupied space in the shell caused by increasing the support structure are avoided, and the energy density is improved;
(3) the wall thicknesses of two adjacent surfaces of the shell formed by stretching in the square battery can be unequal, the wall thicknesses of two opposite surfaces are equal, and the wall thickness of the narrow surface is thicker, so that the requirements of structures such as an explosion-proof valve, a liquid injection hole and the like on the shell can be met.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate an embodiment of the invention and, together with the description, serve to explain the invention and not to limit the invention. In the drawings:
fig. 1 is a schematic structural view of a prismatic battery according to an embodiment of the present invention;
FIG. 2 is a schematic view of a connection structure between the housing and the first and second cover assemblies according to the embodiment of the present invention;
fig. 3 is a schematic view illustrating a connection structure between a core pack and a first top cover assembly according to an embodiment of the invention;
FIG. 4 is a schematic side view of a top cover and an aluminum shell in a prior art;
FIG. 5 is a schematic view of a top cover and an aluminum shell top welding structure in the prior art;
fig. 6 is a flowchart showing the steps of the method for assembling the prismatic battery of the present invention.
Description of reference numerals:
1. a housing; 2. a core package; 3. a base plate; 4. a tab; 5. a first lower plastic; 6. a first header aluminum sheet; 7. a first pole column; 8. second lower plastic; 9. a second header aluminum sheet; 10. a second pole; 11. an insulating film; 12. an ultrasonic welding zone; 13. a laser welding area.
Detailed Description
It should be noted that the embodiments and features of the embodiments may be combined with each other without conflict.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", and the like, indicate orientations or positional relationships based on those shown in the drawings, and are used only for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and thus, are not to be construed as limiting the present invention. Furthermore, the terms "first", "second", etc. are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first," "second," etc. may explicitly or implicitly include one or more of that feature. 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, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; 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 meaning of the above terms in the present invention can be understood by those of ordinary skill in the art through specific situations.
The present invention will be described in detail below with reference to the embodiments with reference to the attached drawings.
As shown in fig. 1 and 2, the square battery of the invention comprises a shell 1, a core package 2, a first top cover assembly and a second top cover assembly, wherein one end of the shell 1 is open, the other end of the shell is provided with a bottom plate 3, the shell 1 and the bottom plate 3 are integrally formed by aluminum alloy through stretching, the bottom plate 3 is provided with a punching hole, the core package 2, the first top cover assembly and the second top cover assembly are all arranged in the shell 1, two ends of the core package 2 are provided with two groups of tabs 4, the two groups of tabs 4 are respectively welded with the first top cover assembly and the second top cover assembly in a one-to-one correspondence manner, the first top cover assembly is hermetically connected with the inner wall of the bottom plate 3, and the second top cover assembly is hermetically connected with one end of the opening of the shell 1;
first top cap subassembly includes first plastic 5, first top cap aluminum sheet 6 and first utmost point post 7, in the punching a hole on the first top cap aluminum sheet 6 embedding bottom plate 3, first plastic 5 offsets with 3 inner walls of bottom plate, first top cap aluminum sheet stretches out from punching a hole on the bottom plate 3, be equipped with the through-hole on the first top cap aluminum sheet 6, first utmost point post 7 stretches out from the through-hole of first top cap aluminum sheet 6, first size of plastic 5 slightly is less than the size of 1 opening of casing, and be greater than the size that punches a hole, the size and the size that punches a hole of first top cap aluminum sheet 6 cooperate, the thickness of first top cap aluminum sheet 6 is the same with the thickness of bottom plate 3. Two side surfaces of the first top cover aluminum sheet 6 in the thickness direction are respectively flush with two side surfaces of the bottom plate 3 in the thickness direction.
The second top cap subassembly includes plastic 8, second top cap aluminum sheet 9 and second utmost point post 10 under the second, and second top cap aluminum sheet 9 welds with 1 open-ended one end of casing, is equipped with the heavy groove that circumference set up on the inner wall of 1 open-ended one end of casing, and second top cap aluminum sheet 9 lateral wall is equipped with and sinks groove complex ladder platform, and the welding seam that casing 1 and second top cap aluminum sheet 9 formed is located the terminal surface of square cell one end.
The core bag 2 is wrapped by an insulating film 11, and the insulating film 11 is respectively connected with the first top cover component and the second top cover component in a hot melting mode.
The present disclosure also provides an assembling method for assembling the above-mentioned prismatic battery, as shown in fig. 6, including the steps of:
and S1, welding the tabs 4 at the two ends of the core bag 2 into a whole respectively.
The two ends of the core bag 2 are respectively provided with a plurality of tabs 4 foils, and the tabs 4 foils at one end of the core bag 2 are welded into a whole through ultrasonic waves to form a tab 4; and (3) carrying out ultrasonic welding on a plurality of tabs 4 at the other end of the core bag 2 to form another tab 4 integrally.
S2, performing laser welding on the tab 4 at one end of the core package 2 and the first pole 7; the tab 4 at the other end is laser welded to the second pole 10 without using an adaptor plate.
And S3, bending the tabs 4 at the two ends of the core package 2 to reduce the space occupied by the tabs 4, and wrapping the insulation film 11 outside the core package 2.
S4, penetrating the first lower plastic 5 on the first pole post 7 and fixedly connecting with one end of the insulating film 11; the second lower plastic 8 is disposed on the second pole pillar 10 and is fixedly connected to the other end of the insulating film 11. Wherein, the fixed connection mode is hot melt connection.
And S5, assembling the first top cover aluminum sheet 6 and the first lower plastic 5, and assembling the second top cover aluminum sheet 9 and the second lower plastic 8.
S6, extending the end of the core package 2 with the first top cover aluminum sheet 6 from the open end of the shell 1, assembling the end with the bottom plate 3 of the shell 1, and performing laser welding at the joint; and assembling the other end of the core bag 2 with the open end of the shell 1, and performing laser welding at the joint.
Wherein, the shell 1 is formed by stretching aluminum material, and forms a structure with one end open and one end closed. Punching the closed end to obtain a shell 1 and a bottom plate 3 with punched holes, and processing an opening of the shell 1 to form a sink;
the above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like that fall within the spirit and principle of the present invention are intended to be included therein.

Claims (8)

1. A prismatic battery, characterized by: the novel battery core pack comprises a shell, a core pack, a first top cover assembly and a second top cover assembly, wherein one end of the shell is opened, the other end of the shell is provided with a bottom plate, the bottom plate is provided with a punched hole, the core pack, the first top cover assembly and the second top cover assembly are arranged in the shell, two groups of lugs are arranged at two ends of the core pack and are welded with the first top cover assembly and the second top cover assembly in a one-to-one correspondence mode, the first top cover assembly is connected with the inner wall of the bottom plate in a sealing mode, and the second top cover assembly is connected with one end of the shell, which is opened, in a sealing mode.
2. The prismatic battery according to claim 1, wherein: first top cap subassembly includes first plastic, first top cap aluminum sheet and first utmost point post, in the punching a hole on the first top cap aluminum sheet embedding bottom plate, first plastic offsets with the bottom plate inner wall down, first top cap aluminum sheet stretches out from punching a hole on the bottom plate, be equipped with the through-hole on the first top cap aluminum sheet, first utmost point post is followed first top cap aluminum sheet the through-hole stretches out.
3. The prismatic battery according to claim 2, wherein: the thickness of the first top cover aluminum sheet is the same as that of the bottom plate, and two side faces of the first top cover aluminum sheet in the thickness direction are flush with two side faces of the bottom plate in the thickness direction respectively.
4. The prismatic battery according to claim 2, wherein: the shell and the bottom plate are integrally formed in a stretching mode.
5. The prismatic battery according to claim 1, wherein: the second top cover assembly comprises a second lower plastic, a second top cover aluminum sheet and a second pole, and the second top cover aluminum sheet is welded with one end of the opening of the shell.
6. The prismatic battery according to claim 5, wherein: the inner wall of one end of the shell with an opening is provided with a circumferential sunken groove, the side wall of the second top cover aluminum sheet is provided with a step platform matched with the sunken groove, and a welding seam formed by the shell and the second top cover aluminum sheet is positioned on the end face of one end of the square battery.
7. The prismatic battery according to claim 1, wherein: the core bag is wrapped by an insulating film, and the insulating film is in hot-melt connection with the first top cover assembly and the second top cover assembly respectively.
8. An assembling method for assembling a prismatic battery according to any one of claims 1 to 7, comprising the steps of:
s1, respectively welding the tab foils at the two ends of the core bag into a whole;
s2, welding a tab at one end of the core cladding with the first pole; the tab at the other end is welded with the second pole;
s3, bending the tabs at the two ends of the core bag, and wrapping an insulating film outside the core bag;
s4, penetrating the first lower plastic on the first pole and fixedly connecting the first lower plastic with one end of the insulating film; penetrating a second lower plastic on the second pole and fixedly connecting the second lower plastic with the other end of the insulating film;
s5, assembling the first top cover aluminum sheet and the first lower plastic, and assembling the second top cover aluminum sheet and the second lower plastic;
s6, extending the end of the core bag with the first top cover aluminum sheet from the open end of the shell, assembling the end with the end of the shell with the bottom plate, and welding the joint; and assembling the other end of the core bag and one end of the opening of the shell, and welding the joint.
CN202210486772.5A 2022-05-06 2022-05-06 Square battery and assembling method Pending CN114744275A (en)

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CN113644355A (en) * 2021-08-16 2021-11-12 胡高建 Power battery and assembling method thereof
CN114421064A (en) * 2021-12-31 2022-04-29 天津市捷威动力工业有限公司 Battery and battery assembling method

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CN108039427A (en) * 2017-12-29 2018-05-15 上海奥威科技开发有限公司 One kind assembling easy two side of going out housing apparatus and its assembly method
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