CN115172998A - Secondary battery and method for manufacturing secondary battery - Google Patents

Secondary battery and method for manufacturing secondary battery Download PDF

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Publication number
CN115172998A
CN115172998A CN202210882526.1A CN202210882526A CN115172998A CN 115172998 A CN115172998 A CN 115172998A CN 202210882526 A CN202210882526 A CN 202210882526A CN 115172998 A CN115172998 A CN 115172998A
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CN
China
Prior art keywords
pole
tab
connecting part
cell main
utmost point
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Pending
Application number
CN202210882526.1A
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Chinese (zh)
Inventor
包瑞奇
黄海宁
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Shanghai Lanjun New Energy Technology Co Ltd
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Shanghai Lanjun New Energy Technology Co Ltd
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Publication date
Application filed by Shanghai Lanjun New Energy Technology Co Ltd filed Critical Shanghai Lanjun New Energy Technology Co Ltd
Priority to CN202210882526.1A priority Critical patent/CN115172998A/en
Publication of CN115172998A publication Critical patent/CN115172998A/en
Pending legal-status Critical Current

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/528—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
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0404—Machines for assembling batteries
    • H01M10/0409—Machines for assembling batteries for cells with wound electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00—Secondary cells; Manufacture thereof
    • H01M10/04—Construction or manufacture in general
    • H01M10/0431—Cells with wound or folded electrodes
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50—Current conducting connections for cells or batteries
    • H01M50/531—Electrode connections inside a battery casing
    • 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
    • H01M50/572—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)
  • Connection Of Batteries Or Terminals (AREA)

Abstract

The embodiment of the invention provides a secondary battery and a manufacturing method of the secondary battery, belonging to the technical field of secondary batteries. The secondary battery comprises a battery core main body and an adapter. The battery cell main body comprises a plurality of pole pieces and a plurality of pole lugs, and the pole lugs are connected to the pole pieces in a one-to-one correspondence manner and extend out of the outer sides of the pole pieces. The adaptor includes interconnect's utmost point post connecting portion and utmost point ear connecting portion, and utmost point ear connecting portion keep away from the one end of utmost point post connecting portion and buckle towards the bottom to extend towards utmost point post connecting portion's direction, with form installation space between the utmost point post connecting portion. And one end of at least part of the pole lug, which is far away from the pole piece, is arranged in the mounting space and is fixedly connected with the pole lug connecting part. The length of the tab can be effectively shortened, and the problem of contact short circuit between the tab and an electrode is solved.

Description

Secondary battery and method for manufacturing secondary battery
Technical Field
The present invention relates to the field of secondary batteries, and particularly, to a secondary battery, and a method of manufacturing a secondary battery.
Background
In the secondary battery, a tab of an electrode is connected with a pole through an adaptor to realize the output of electric energy in the electrode.
However, the conventional secondary battery (for example, application publication No. CN 108428852A) has an unreasonable design of the connection structure between the adaptor and the tab, and the tab has a long length, which is prone to short circuit and waste of raw materials.
Disclosure of Invention
The present invention is directed to provide a secondary battery, a secondary battery and a method of manufacturing the secondary battery, which can effectively save the length of tabs and improve the problem of short circuit caused by the tabs.
The embodiment of the invention is realized by the following steps:
in a first aspect, an embodiment of the present invention provides a secondary battery, where the secondary battery includes a battery cell main body and an adaptor;
the battery cell main body comprises a plurality of pole pieces and a plurality of pole lugs, and the pole lugs are connected to the pole pieces and extend out of the pole pieces;
the adapter comprises an electrode post connecting part and an electrode lug connecting part which are mutually connected, wherein one end of the electrode lug connecting part, which is far away from the electrode post connecting part, is bent towards the bottom and extends towards the electrode post connecting part so as to form an installation space with the electrode post connecting part;
at least one end of the pole lug, which is far away from the pole piece, is arranged in the mounting space and is fixedly connected with the pole lug connecting part.
In optional embodiment, utmost point ear connection portion is U type structure, utmost point ear connection portion includes first section, second section and bending segment, and first section and second section set up relatively, and through bending segment interconnect, first section the second section with the bending segment encloses to close and forms installation space, the tip of first section with utmost point post connection portion connects, the tip of second section towards the direction of utmost point post connection portion extends.
In an alternative embodiment, the tab is connected to the second section on a side thereof adjacent to the first section by welding.
In an alternative embodiment, the length of the second section is less than half of the thickness of the cell main body, and a part of the tabs are stacked in the middle of the cell main body and bent towards the end of the second section to extend into the mounting space.
In an alternative embodiment, the thickness of at least part of the tab connection part is smaller than the thickness of the pole connection part; and/or;
and a bending groove is formed in the pole piece connecting part along the width direction of the pole piece connecting part.
In an optional embodiment, the number of the battery cell main bodies includes two, two battery cell main bodies are stacked, the number of the tab connecting portions includes two, two tab connecting portions are respectively connected with the pole connecting portions, and the tabs of the two battery cell main bodies are respectively arranged in the installation space formed by the two tab connecting portions and are respectively connected with the two tab connecting portions.
In an optional embodiment, the two tabs of the battery cell main body are arranged oppositely, the two tab connecting portions are arranged on two opposite sides of the pole connecting portion, and one ends of the two tab connecting portions, which are far away from the pole connecting portion, are bent towards the bottom and extend towards the pole connecting portion, so that an installation space is formed between the two tab connecting portions and the pole connecting portion respectively.
In an alternative embodiment, the plurality of pole pieces of the two cell main bodies are stacked in the middle of the corresponding cell main body, and are respectively bent toward the outside of the cell main body, and respectively extend into the mounting space along the end portion of the corresponding tab connecting portion.
In an optional embodiment, the number of the adapters includes two, wherein part of the plurality of pole pieces is a positive pole piece, the other part of the pole pieces is a negative pole piece, part of the plurality of pole tabs connected with the positive pole piece is connected to the pole piece connecting portion of one of the adapters, and part of the plurality of pole tabs connected with the negative pole piece is connected to the pole tab connecting portion of the other adapter.
In a second aspect, the present invention further provides a method for manufacturing a secondary battery, where the secondary battery includes a battery cell main body and an adaptor, the battery cell main body includes a plurality of pole pieces and a plurality of tabs, the tabs are connected to the pole pieces and extend to the outer sides of the pole pieces, and the adaptor includes a pole connecting portion and a tab connecting portion that are connected to each other and are on the same plane;
the method comprises the following steps:
laminating at least part of the tabs and connecting the tabs with the tab connecting part;
bending the tab connecting part to enable the tab connecting part to be bent towards the bottom of the pole connecting part and enable the end part of the tab connecting part to extend towards the direction of the pole connecting part so as to enable the portion, connected to the tab connecting part, of the tab to be located in an installation space formed between the tab connecting part and the pole connecting part;
and bending the lug connected to the lug connecting part to enable the adaptor to be positioned above the battery cell main body.
In an optional embodiment, the number of the cell main bodies includes two, a positive plate is arranged in a middle of a plurality of the pole pieces of the two cell main bodies, and a negative plate is arranged in the other part of the pole pieces;
the number of the switching pieces comprises two, each switching piece is provided with two lug connecting parts, the two lug connecting parts are respectively connected to two opposite sides of the pole connecting part, and the two lug connecting parts and the pole connecting part are in the same plane;
the step of laminating at least part of the tabs and coupling the tabs to the tab connection part may include:
gathering and laminating all the tabs connected with the positive pole pieces and all the tabs connected with the positive pole pieces on each electric core main body in the middle of the electric core main body corresponding to the tabs;
placing two battery cell main bodies on two sides of the two adapters respectively, stacking the two stacked battery cell main bodies and the lugs connected with the positive plates on the two lug connecting parts of one adapter respectively, and stacking the two battery cell main bodies and the lugs connected with the positive plates on the two lug connecting parts of the other adapter respectively;
the lugs of the two battery cell main bodies are respectively connected with the lug connecting parts of the two adapters in a welding mode;
it is right tab connection portion bends, makes tab connection portion towards the bottom of utmost point post connection portion is buckled, and makes tab connection portion's tip towards the direction of utmost point post connection portion extends, in order to let the connection be in tab connection portion's part utmost point ear is located tab connection portion with step in the installation space that forms between the utmost point post connection portion includes:
bending the pole lug connecting parts of the two adapter pieces one by one or simultaneously to bend all the pole lug connecting parts of the two adapter pieces towards the bottom of the pole column connecting part and extend the end parts of all the pole lug connecting parts towards the direction of the pole column connecting part so as to ensure that the pole lugs connected to all the pole lug connecting parts are positioned in the mounting space between the pole lug connecting parts and the pole column connecting part;
the step of bending the tab connected to the tab connection portion to enable the adaptor to be located above the battery cell main body includes:
and bending all the lugs connected to the two adapters one by one or respectively to ensure that the two adapters are positioned above the battery cell main body.
The secondary battery and the manufacturing method of the secondary battery provided by the embodiment of the invention have the beneficial effects that:
this application is buckled towards the bottom through the one end of keeping away from utmost point post connecting portion with utmost point ear connecting portion to extend towards the direction of utmost point post connecting portion, with and form installation space between the utmost point post connecting portion, the one end of keeping away from the pole piece with partial utmost point ear again sets up in installation space, thereby can shorten the length of utmost point ear with utmost point ear connecting portion fixed connection, and utmost point ear connecting portion after bending can form to the utmost point ear and shelter from, thereby can improve the emergence that utmost point ear and pole piece contact formed the short circuit.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings needed to be used in the embodiments will be briefly described below, it should be understood that the following drawings only illustrate some embodiments of the present invention and therefore should not be considered as limiting the scope, and for those skilled in the art, other related drawings can be obtained according to the drawings without inventive efforts.
Fig. 1 is a schematic view illustrating a connection between a tab and an adaptor in the prior art;
fig. 2 is a schematic structural view of a secondary battery provided in an embodiment of the present invention;
FIG. 3 isbase:Sub>A schematic cross-sectional view taken along the line A-A in FIG. 2;
fig. 4 is a schematic structural diagram of an adaptor of a secondary battery provided in an embodiment of the present invention in an unbent state;
fig. 5 is a schematic structural diagram of another view angle of the adaptor of the secondary battery provided in the embodiment of the invention in an unbent state;
fig. 6 is a schematic structural view of an adaptor and a tab of a secondary battery according to an embodiment of the present invention during welding.
100-secondary battery; 110-a cell body; 111-pole piece; 113-a tab; 130-an adaptor; 131-pole connecting part; 133-tab connection; 135-installation space; 137-first section; 139-second segment; 141-bending section.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention clearer, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are some, but not all embodiments of the present invention. The components of embodiments of the present invention generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations.
Thus, the following detailed description of the embodiments of the present invention, as presented in the figures, is not intended to limit the scope of the invention, as claimed, but is merely representative of selected embodiments of the invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, it need not be further defined and explained in subsequent figures.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. indicate orientations or positional relationships based on orientations or positional relationships shown in the drawings or orientations or positional relationships that the present product is conventionally placed in use, and are only for convenience of describing the present invention and simplifying the description, but do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," and the like are used solely to distinguish one from another, and are not to be construed as indicating or implying relative importance.
Furthermore, the terms "horizontal", "vertical" and the like do not imply that the components are required to be absolutely horizontal or pendant, but rather may be slightly inclined. For example, "horizontal" merely means that the direction is more horizontal than "vertical" and does not mean that the structure must be perfectly horizontal, but may be slightly inclined.
In the description of the present invention, it should also be noted that, unless otherwise explicitly specified or limited, the terms "disposed," "mounted," "connected," and "connected" are to be construed broadly and may, for example, be 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 specific cases to those skilled in the art.
Referring to fig. 1, the inventor found that when the conventional tab is connected to the adaptor, the tab needs to be first folded to the edge close to the winding core, and then is bent inward and then welded to the adaptor, so that the tab has a long length, and the tab is easily in contact with the pole piece of the winding core to cause short circuit when the top cover is mounted.
Referring to fig. 2 and 3, an embodiment of the invention provides a secondary battery 100. The secondary battery 100 includes a cell main body 110 and an adaptor 130. The cell main body 110 includes a plurality of pole pieces 111 and a plurality of tabs 113, and the plurality of tabs 113 are connected to the pole pieces 111 in a one-to-one correspondence manner and extend out of the pole pieces 111. The adaptor 130 includes a pole connecting portion 131 and a tab connecting portion 133 connected to each other, and one end of the tab connecting portion 133 away from the pole connecting portion 131 is bent toward the bottom thereof and extends toward the pole connecting portion 131, and forms an installation space 135 with the pole connecting portion 131. At least one end of the tab 113, which is far away from the pole piece 111, is disposed in the mounting space 135 and is fixedly connected to the tab connecting portion 133.
This embodiment is through the one end of keeping away from utmost point ear connecting portion 133 utmost point ear connecting portion 131 towards the bottom bending, and extend towards utmost point ear connecting portion 131's direction, with form installation space 135 between the utmost point ear connecting portion 131, the one end of keeping away from utmost point ear 113 again sets up in installation space 135, thereby can shorten utmost point ear 113's length with utmost point ear connecting portion 133 fixed connection, and utmost point ear connecting portion 133 after bending can form to utmost point ear 113 and shelter from, thereby can improve the emergence that utmost point ear 113 and utmost point ear 111 contact formed the short circuit.
The cell main body 110 may be a winding core formed by stacking or winding a positive electrode sheet, a separator, and a negative electrode sheet.
In the present embodiment, the tab connection part 133 has a U-shaped structure, and the tab connection part 133 includes a first section 137, a second section 139 and a bending section 141. First section 137 and second section 139 set up relatively, and through kinking section 141 interconnect, first section 137, second section 139 and kinking section 141 enclose and close and form installation space 135, and the tip of first section 137 is connected with utmost point post connecting portion 131, and the tip of second section 139 extends towards utmost point post connecting portion 131's direction.
The present embodiment provides the tab connecting part 133 in a U-shaped structure so that the tab 113 can be partially protected in the mounting space 135 by the first and second sections 137 and 139.
In this embodiment, the tab 113 is connected to the second segment 139 at a side close to the first segment 137 by welding.
The embodiment welds the tab 113 to the second section 139 to facilitate the welding of the tab 113.
In the present embodiment, the length of the second segment 139 is less than one half of the thickness of the cell main body 110, and part of the tabs 113 are stacked in the middle of the cell main body 110 and bent toward the end of the second segment 139 to extend into the installation space 135.
Referring to fig. 2 and 3, in the present embodiment, the thickness of the tab connecting portion 133 is smaller than that of the pole connecting portion 131.
The present embodiment sets the thickness of the tab connection part 133 to be smaller than that of the pole connection part 131 to facilitate the bending of the tab connection part 133.
In some embodiments of the present application, the connection portion of the pole piece 111 is provided with a bending groove or a cutting line along the width direction of the connection portion of the pole piece 111, and the tab connection portion 133 may be bent along the bending groove or the cutting line.
In this embodiment, the number of the cell main bodies 110 includes two, two cell main bodies 110 are stacked, the number of the tab connection portions 133 includes two, the two tab connection portions 133 are respectively connected with the pole connection portion 131, and the tabs 113 of the two cell main bodies 110 are respectively disposed in the installation space 135 formed by the two tab connection portions 133 and are respectively connected with the two tab connection portions 133. Two tab connection portions 133 are provided so that the pole pieces 111 on two cell bodies 110 can be connected simultaneously by means of one adapter 130.
In this embodiment, the tabs 113 of the two cell main bodies 110 are disposed oppositely, the two tab connection portions 133 are disposed on two opposite sides of the pole connection portion 131, and one ends of the two tab connection portions 133, which are far away from the pole connection portion 131, are bent toward the bottom and extend toward the pole connection portion 131, so as to form the installation space 135 between the two tab connection portions 131.
In this embodiment, the two tab connection portions 133 are disposed on two opposite sides, and are bent and extended toward the center, so that two cell main bodies 110 can be conveniently connected at the same time.
In the present embodiment, the pole pieces 111 of the two cell main bodies 110 are stacked in the middle of the corresponding cell main body, and are respectively bent toward the outside of the cell main body 110, and respectively extend into the mounting space 135 along the end of the corresponding tab connecting portion 133.
This embodiment is range upon range of with utmost point ear 113 of electric core main part 110 at the middle part of electric core, can shorten utmost point ear 113's length, and can let the utmost point ear 113 length symmetry of both sides, is convenient for cut utmost point ear 113.
Referring to fig. 2 and fig. 3, in the present embodiment, the number of the adapters 130 includes two, a part of the pole pieces 111 in the plurality of pole pieces 111 is a positive pole piece (not shown), another part of the pole pieces 111 is a negative pole piece 111 (not shown), a part of the plurality of pole pieces 113 connected to the positive pole piece is connected to the pole piece 111 connection portion of one adapter 130, and a part of the plurality of pole pieces 113 connected to the negative pole piece 111 is connected to the pole piece connection portion 133 of another adapter 130.
Referring to fig. 4, fig. 5, and fig. 6, in the present embodiment, two adapters 130 are disposed to be respectively connected to the positive electrode and the negative electrode of the battery cell.
The embodiment of the present invention further provides a manufacturing method of the secondary battery 100, the secondary battery 100 includes a battery cell main body 110 and an adaptor 130, the battery cell main body 110 includes a plurality of pole pieces 111 and a plurality of tabs 113, the plurality of tabs 113 are connected to the pole pieces 111 in a one-to-one correspondence, and extend to the outer sides of the pole pieces 111, and the adaptor 130 includes a pole connecting portion 131 and a pole connecting portion 133 that are connected to each other and are in the same plane.
The method comprises the following steps:
stacking at least a part of the tabs 113 and connecting the same to the tab connecting part 133;
bending the tab connecting part 133 to bend the tab connecting part 133 toward the bottom of the post connecting part 131 and extend the end of the tab connecting part 133 toward the post connecting part 131, so that a part of the tab 113 connected to the tab connecting part 133 is located in the installation space 135 formed by the tab connecting part 133 and the post connecting part 131;
the tab 113 connected to the tab connection portion 133 is bent such that the adaptor 130 is positioned above the cell body 110.
According to the method, the tab 113 is connected with the sheet-shaped adaptor 130, and then the adaptor 130 is bent to form the mounting space 135, so that the assembly efficiency can be improved, and the connection strength and the connection quality between the tab 113 and the adaptor 130 can be ensured.
In this embodiment, the number of the battery cell main bodies 110 includes two, and a part of the tabs 113 of the two battery cell main bodies 110 is a positive tab, and the other part is a negative tab;
the number of the adaptor 130 comprises two, each adaptor 130 is provided with two tab connection parts 133, the two tab connection parts 133 are respectively connected to two opposite sides of the pole connection part 131, and the two tab connection parts 133 and the pole connection part 131 are in the same plane;
the step of laminating at least part of the tabs 113 and connecting the tab connection parts 133 includes:
gathering and laminating all the positive electrode tabs 113 and the negative electrode tabs 113 on each cell main body 110 in the middle of the cell main body 110;
placing the two cell main bodies 110 on two sides of the two adapters 130 respectively, and enabling the positive lugs 113 of the two cell main bodies 110 after being stacked to be stacked on the two lug connecting parts 133 of one adapter 130 respectively, and then enabling the negative lugs of the two cell main bodies 110 after being stacked to be stacked on the two lug connecting parts 133 of the other adapter 130 respectively;
the positive electrode tabs 113 and the negative electrode tabs 113 of the two cell main bodies 110 are respectively connected with the tab connection parts 133 of the two adapters 130 in a welding manner;
the bending of the tab connection portion 133 makes the tab connection portion 133 bend toward the bottom of the post connection portion 131, and makes the end of the tab connection portion 133 extend toward the post connection portion 131, so that the step of connecting the portion of the tab 113 of the tab connection portion 133 in the installation space 135 formed by the tab connection portion 133 and the post connection portion 131 includes:
bending the tab connection parts 133 of the two adapters 130 one by one or simultaneously, so that the tab connection parts 133 of the two adapters 130 are bent towards the bottom of the pole connection part 131, and the end parts of all the tab connection parts 133 extend towards the pole connection part 131, so that the positive tab 113 and the negative tab 113 connected to the tab connection parts 133 are positioned in the installation space 135 between the tab connection parts 133 and the pole connection part 131;
the step of bending the tab 113 connected to the tab connecting portion 133 to make the adaptor 130 located above the cell main body 110 includes:
the positive electrode tab 113 and the negative electrode tab 113 connected to the two adapters 130 are bent one by one or respectively, so that the two adapters 130 are both located above the battery cell main body 110.
In the embodiment, the two connecting sheets are firstly connected with the positive electrode tab 113 and the negative electrode tab 113 respectively and then bent, so that the assembly efficiency and the connection quality can be improved.
In this embodiment, the tab 113 is connected to the second segment 139 by ultrasonic welding.
In summary, the working principle and the beneficial effects of the secondary battery 100 and the manufacturing method of the secondary battery 100 provided by the embodiment of the present invention include:
this application is buckled towards the bottom through the one end of keeping away from utmost point post connecting portion 131 with utmost point post connecting portion 133, and extend towards utmost point post connecting portion 131's direction, with form installation space 135 between the utmost point post connecting portion 131, the one end of keeping away from utmost point ear 113 again sets up in installation space 135, thereby can shorten utmost point ear 113's length with utmost point post connecting portion 133 fixed connection, and utmost point post connecting portion 133 after bending can form to utmost point ear 113 and shelter from, thereby can improve the emergence that utmost point ear 113 and utmost point ear 111 contact formed the short circuit.
The above is only a preferred embodiment of the present invention, and is not intended to limit the present invention, and various modifications and changes will occur to those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims (11)

1. A secondary battery is characterized by comprising a battery core main body and an adapter piece;
the battery cell main body comprises a plurality of pole pieces and a plurality of pole lugs, and the pole lugs are connected to the pole pieces and extend out of the pole pieces;
the adaptor comprises a pole connecting part and a pole lug connecting part which are connected with each other, wherein one end of the pole lug connecting part, which is far away from the pole connecting part, is bent towards the bottom and extends towards the direction of the pole connecting part so as to form an installation space with the pole connecting part;
at least one end of the pole lug, which is far away from the pole piece, is arranged in the mounting space and is fixedly connected with the pole lug connecting part.
2. The secondary battery of claim 1, wherein the tab connection portion is of a U-shaped structure, the tab connection portion includes a first section, a second section and a bending section, the first section and the second section are oppositely disposed and connected to each other through the bending section, the first section, the second section and the bending section enclose the installation space, the end of the first section is connected to the tab connection portion, and the end of the second section extends toward the tab connection portion.
3. The secondary battery according to claim 2, wherein the tab is connected to the second section on a side thereof adjacent to the first section by welding.
4. The secondary battery of claim 2, wherein the length of the second section is less than half of the thickness of the cell main body, and a part of the tabs are stacked in the middle of the cell main body and bent toward the end of the second section to extend into the mounting space.
5. A secondary battery according to any of claims 1-4, characterized in that at least part of the tab connection part has a smaller thickness than the pole connection part; and/or;
and a bending groove is formed in the pole piece connecting part along the width direction of the pole piece connecting part.
6. The secondary battery according to any one of claims 1 to 4, wherein the number of the cell bodies includes two, two of the cell bodies are stacked, the number of the tab connecting portions includes two, two of the tab connecting portions are respectively connected to the tab connecting portions, and the tabs of the two cell bodies are respectively disposed in the installation space formed by the two tab connecting portions and are respectively connected to the two tab connecting portions.
7. The secondary battery of claim 6, wherein the tabs of the two cell main bodies are disposed oppositely, the two tab connecting portions are disposed on two opposite sides of the post connecting portion, and one ends of the two tab connecting portions, which are far away from the post connecting portion, are bent toward the bottom and extend toward the post connecting portion, so as to form an installation space between the two tab connecting portions and the post connecting portion.
8. The secondary battery of claim 7, wherein the plurality of pole pieces of the two cell main bodies are stacked in the middle of the corresponding cell main body, and are respectively bent toward the outside of the cell main body and respectively extend into the mounting space along the end of the corresponding tab connecting portion.
9. The secondary battery of claim 8, wherein the number of the adapters includes two, wherein a portion of the plurality of pole pieces is a positive pole piece, another portion of the plurality of pole pieces is a negative pole piece, a portion of the plurality of tabs connected to the positive pole piece is connected to the pole piece connection portion of one of the adapters, and a portion of the plurality of tabs connected to the negative pole piece is connected to the tab connection portion of another of the adapters.
10. The manufacturing method of the secondary battery is characterized in that the secondary battery comprises a battery cell main body and an adapter, wherein the battery cell main body comprises a plurality of pole pieces and a plurality of pole lugs, the pole lugs are connected to the pole pieces and extend out of the pole pieces, and the adapter comprises a pole connecting part and a pole lug connecting part which are connected with each other and are positioned on the same plane;
the method comprises the following steps:
laminating at least part of the tabs and connecting the tabs with the tab connecting part;
bending the tab connecting part to enable the tab connecting part to be bent towards the bottom of the pole connecting part and enable the end part of the tab connecting part to extend towards the direction of the pole connecting part so as to enable part of the tab connected to the tab connecting part to be positioned in an installation space formed between the tab connecting part and the pole connecting part;
and bending the lug connected to the lug connecting part to enable the adaptor to be positioned above the battery cell main body.
11. The method of manufacturing a secondary battery according to claim 10, characterized in that:
the number of the battery cell main bodies comprises two, the middle parts of the pole pieces of the two battery cell main bodies are positive pole pieces, and the other parts of the pole pieces are negative pole pieces;
the number of the switching pieces comprises two, each switching piece is provided with two lug connecting parts, the two lug connecting parts are respectively connected to two opposite sides of the pole connecting part, and the two lug connecting parts and the pole connecting part are in the same plane;
the step of laminating at least part of the tabs and connecting the tab connection parts includes:
gathering and laminating all the tabs connected with the positive plates and all the tabs connected with the positive plates on each electric core main body in the middle of the electric core main body corresponding to the tabs respectively;
placing two cell main bodies on two sides of the two adapters respectively, stacking the tabs connected with the positive plates after the two cell main bodies are stacked on the two tab connecting parts of one adapter respectively, and stacking the tabs connected with the positive plates of the two cell main bodies on the two tab connecting parts of the other adapter respectively;
the lugs of the two battery cell main bodies are respectively connected with the lug connecting parts of the two adapters in a welding mode;
it is right utmost point ear connecting portion bend, make utmost point ear connecting portion towards the bottom of utmost point post connecting portion is buckled, and makes utmost point ear connecting portion's tip towards the direction of utmost point post connecting portion extends, so that connect in utmost point ear connecting portion's part utmost point ear is located utmost point ear connecting portion with the step in the installation space that forms between the utmost point post connecting portion includes:
bending the tab connecting parts of the two switching pieces one by one or simultaneously to bend all the tab connecting parts of the two switching pieces towards the bottom of the pole connecting part and extend the end parts of all the tab connecting parts towards the direction of the pole connecting part so as to enable the tabs connected to all the tab connecting parts to be positioned in the mounting space between the tab connecting parts and the pole connecting part;
the step of bending the tab connected to the tab connecting part to make the adaptor located above the battery cell main body comprises:
and bending all the lugs connected to the two adapters one by one or respectively to ensure that the two adapters are positioned above the battery cell main body.
CN202210882526.1A 2022-07-26 2022-07-26 Secondary battery and method for manufacturing secondary battery Pending CN115172998A (en)

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