CN106410104B - Cylindrical multi-tab battery and manufacturing method thereof - Google Patents

Cylindrical multi-tab battery and manufacturing method thereof Download PDF

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Publication number
CN106410104B
CN106410104B CN201610728934.6A CN201610728934A CN106410104B CN 106410104 B CN106410104 B CN 106410104B CN 201610728934 A CN201610728934 A CN 201610728934A CN 106410104 B CN106410104 B CN 106410104B
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battery
end cover
current collecting
lug
core
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CN106410104A (en
Inventor
邢军龙
倪世杰
张宏立
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Hefei Gotion High Tech Power Energy Co Ltd
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Hefei Guoxuan High Tech Power Energy Co Ltd
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    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/50Current conducting connections for cells or batteries
    • H01M50/531Electrode connections inside a battery casing
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/052Li-accumulators
    • H01M10/0525Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M10/00Secondary cells; Manufacture thereof
    • H01M10/05Accumulators with non-aqueous electrolyte
    • H01M10/058Construction or manufacture
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01MPROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M50/00Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
    • H01M50/10Primary casings; Jackets or wrappings
    • H01M50/147Lids or covers
    • H01M50/148Lids or covers characterised by their shape
    • H01M50/152Lids or covers characterised by their shape for cells having curved cross-section, e.g. round or elliptic
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/10Energy storage using batteries
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02PCLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
    • Y02P70/00Climate change mitigation technologies in the production process for final industrial or consumer products
    • Y02P70/50Manufacturing 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)
  • Materials Engineering (AREA)
  • Connection Of Batteries Or Terminals (AREA)
  • Sealing Battery Cases Or Jackets (AREA)

Abstract

The invention relates to a cylindrical multi-pole-ear battery and a manufacturing method thereof, wherein the cylindrical multi-pole-ear battery comprises a hollow cylindrical shell, a roll core arranged in the shell, and a positive end cover and a negative end cover which are used for sealing the shell, wherein the two ends of the roll core are respectively provided with a battery cell pole ear, the positive end cover and the negative end cover are respectively provided with a pole column used for leading out current and a flexible connection connected with the pole column, and the flexible connections of the positive end cover and the negative end cover are respectively connected with the battery cell pole ear at the end part of the roll core through a current collecting claw positioned at the inner side of the flexible connections. The flexible connection structure is simple in structure and convenient to install, wherein the flexible connection of the positive end cover and the negative end cover is respectively connected with the battery core lug at the end part of the winding core through the current collecting claws positioned at the inner sides of the flexible connection structure, so that the overcurrent capacity of the battery can be considered, and the shock resistance and the conductive stability of the battery can be improved.

Description

Cylindrical multi-tab battery and manufacturing method thereof
Technical Field
The invention relates to the technical field of lithium ion batteries, in particular to a cylindrical multi-tab battery and a manufacturing method thereof.
Background
The early cylindrical lithium ion battery adopts a single-pole lug design, namely, a pole lug is ultrasonically welded on a pole piece and is led out to be welded with a top cover, but the pole lug is required to be reserved on the pole piece for welding the pole lug by the manufacturing method, so that part of battery capacity is lost, and if the mode of ultrasonically welding a plurality of pole lugs is changed, the production efficiency and the capacity are obviously reduced. CN201520431840.3 proposes a method of leaving blank foils at the outer ends of positive and negative pole pieces, and welding bus plates on the blank foil kneading planes at the two ends of the electric core after winding into a roll core, which does not need to leave blanks for welding tabs on the pole pieces, so there is no capacity loss, but because the contact between the foils after kneading is still not very tight, and because the kneading plane has a small thickness, when the bus plates and the kneading plane are welded together by laser, the roll core is damaged once the current collecting plate is welded through. If the laser power is reduced, the welding strength cannot be ensured, and the bus bar pieces are easy to fall off from the kneading plane. CN201410371930.8 proposes a full-tab current collecting disc, which consists of two parts, an insulating layer and a conductive layer, wherein the insulating layer is provided with slits with the same grain as the winding of the battery cell, small rectangular small openings for electrolyte to enter are uniformly distributed between the slits, and the upper edge of the slit of the insulating layer is plated with a conductive copper wire with the width of 1.5 mm; during welding, the wound battery core is passed through the slit of the current collecting disc and is 1.5mm higher than the slit, and then is folded to cover the conductive copper belt and is welded by adopting a continuous laser welding technology. Although the patent can realize the welding of all the lugs and the current collecting disc, the proposal requires that a winding core passes through the slit of the current collecting disc, the operation is complex, the efficiency is low, and the large-scale industrial production cannot be carried out.
Disclosure of Invention
The invention aims to provide a cylindrical multi-tab battery which is simple to operate, has higher efficiency and can give consideration to the overcurrent capacity of the battery and a manufacturing method thereof.
In order to achieve the purpose, the invention adopts the following technical scheme:
the utility model provides a cylindrical many utmost point ear battery, includes the hollow cylindrical casing, arranges the core of rolling up in the casing in and is used for the anodal end cover and the negative pole end cover of sealed casing, the both ends of rolling up the core are equipped with electric core utmost point ear respectively, all be equipped with the utmost point post that is used for deriving the electric current on anodal end cover and the negative pole end cover and link to each other with utmost point post flexible coupling, the flexible coupling of anodal end cover and negative pole end cover links to each other with the electric core utmost point ear of rolling up the core tip through the mass flow claw that is located its inboard respectively.
In the above scheme, electric core utmost point ear is two relative settings and is rolling up core tip and be sectorial boss, and this boss is followed roll up the axis symmetric distribution of core.
In the above scheme, the current collecting claw comprises a fixed block, and a current collecting lug and a claw which are connected with the fixed block, the claws are two groups and are respectively arranged opposite to the battery cell lug, each group of claws consists of two arc-shaped welding rods, the outline shape between the two welding rods is matched with the outline shape of the boss, and the current collecting lug is welded with the flexible connection.
In the above scheme, electric core utmost point ear and roll up core formula structure as an organic whole.
In the scheme, the anode end cover is provided with a liquid injection hole, and the cathode end cover is provided with an explosion-proof valve.
A method of manufacturing a cylindrical battery, comprising the steps of:
(1) Coating materials on a current collector in a longitudinal continuous coating mode, wherein strip-shaped blanks are arranged on two sides of the current collector and between coating areas, and a battery positive plate and a battery negative plate are manufactured for standby;
(2) Rolling and cutting the coated positive plate and the coated negative plate of the battery, and cutting the blank part into a tab by adopting laser;
(3) Superposing and winding a positive plate, a negative plate and a diaphragm into a cylindrical winding core in a negative plate-diaphragm-positive plate-diaphragm mode, wherein the tabs of the positive plate and the negative plate are respectively positioned at two ends of the winding core;
(4) Assembling and welding a current collecting claw and a tab together, and sticking a high-temperature insulating tape outside the current collecting claw;
(5) Loading the winding core into the shell;
(6) Welding the soft connection of the current collecting claw, the positive end cover and the negative end cover together, and folding the soft connection into a Z shape;
(7) Installing the positive end cover and the negative end cover on the shell, and performing laser welding to manufacture a battery;
(8) Baking, injecting, forming and sealing the battery.
In the above step, the tab width and the tab spacing satisfy the following requirements: after the winding core is wound, the adjacent tabs are distributed in a fan shape.
According to the technical scheme, the cylindrical multi-tab battery is simple in structure and convenient to install, wherein the flexible connection of the positive end cover and the negative end cover is respectively connected with the battery core tab at the end part of the winding core through the current collecting claw positioned on the inner side of the flexible connection, so that the overcurrent capacity of the battery can be considered, and the shock resistance and the conductive stability of the battery are improved. When the cylindrical multi-lug battery is manufactured, the capacity of the battery is ensured by cutting the reserved part into the lugs, the large-current charging and discharging performance of the battery is also ensured by the design of the multi-lugs and the welding mode of the current collecting claw, and batch production is facilitated.
Drawings
Fig. 1 is a schematic structural view of a cylindrical multi-tab battery of the present invention;
fig. 2 is an exploded view of a cylindrical multi-tab battery of the present invention;
FIG. 3 is a schematic view of the construction of the winding core of the present invention;
FIG. 4 is a schematic structural view of a current collecting claw according to the present invention;
FIG. 5 is a schematic structural view of the positive end cap of the present invention;
FIG. 6 is a schematic view of the structure of the negative end cap of the present invention;
FIG. 7 is a process diagram of the ear formation of the pole piece of the present invention.
Detailed Description
The invention is further described below with reference to the accompanying drawings:
as shown in fig. 1 and 2, the cylindrical multi-tab battery of this embodiment includes a hollow cylindrical casing 10, a winding core 11 disposed in the casing 10, and a positive end cap 17 and a negative end cap 12 for sealing the casing 10, wherein a cell tab 13 is respectively disposed at a positive end and a negative end of the winding core 11, a terminal 14 for leading out current and a flexible connection 15 connected to the terminal 14 are respectively disposed on the positive end cap 17 and the negative end cap 12, and the flexible connection 15 of the positive end cap 17 and the negative end cap 12 is respectively welded to the cell tab 13 at the end of the winding core 11 through a current collecting claw 16 located at the inner side thereof.
As shown in fig. 3, the cell tabs 13 are two fan-shaped bosses oppositely disposed at the end of the winding core 11, and the bosses are symmetrically distributed along the axis of the winding core 11.
As shown in fig. 4, the current collecting claw 16 includes a fixed block 161, and a current collecting tab 162 and a claw 163 connected to the fixed block 161, where the claw 163 is provided in two groups and is respectively disposed opposite to the cell tab 13, each group of claw 163 is composed of two arc welding rods, the outline shape between the two welding rods matches the outline shape of the boss, when the current collecting claw is installed, the cell tab 13 is placed in the gap between the claws 163 composed of the two welding rods, the welding rods are tightly attached to the cell tab 13, then the welding rods and the cell tab 13 are welded together, the current collecting tab 162 is welded to the flexible connection 15, when the current collecting tab 162 is installed, the current collecting tab 162 is bent to be in a zigzag shape and placed in the housing 10, fig. 4 shows a schematic structural diagram when the current collecting tab 162 in the current collecting claw 16 is not bent, and the bent current collecting tab 162 is shown in fig. 1. In this embodiment, the cell tab 13 and the winding core 11 are integrally molded.
As shown in fig. 5 and 6, the positive end cap 17 is provided with a liquid injection hole 171, and the negative end cap 12 is provided with an explosion-proof valve 121.
A manufacturing method of a cylindrical multi-tab battery comprises the following steps:
s1: coating materials on a current collector in a longitudinal continuous coating mode, wherein strip-shaped blanks are arranged on two sides of the current collector and between coating areas, and a battery positive plate and a battery negative plate are manufactured for standby;
s2: rolling and cutting the coated positive plate and the coated negative plate of the battery, and cutting the blank part into a tab by adopting laser;
s3: superposing and winding a positive plate, a negative plate and a diaphragm into a cylindrical winding core 11 according to a negative plate-diaphragm-positive plate-diaphragm mode, wherein the polar lugs of the positive plate and the negative plate are respectively positioned at two ends of the winding core 11;
s4: assembling and welding the current collecting claws 16 and the tabs 162 together, and attaching high-temperature insulating tapes to the outer sides of the current collecting claws 16;
s5: the winding core 11 is loaded into the case 10;
s6: welding the current collecting claw 16 with the flexible connection 15 of the positive end cover 17 and the negative end cover 12 together, and folding the flexible connection 15 into a Z shape;
s7: installing the positive end cover 17 and the negative end cover 12 on the shell 10, and performing laser welding to preliminarily manufacture a battery;
s8: then baking, injecting, forming and sealing the battery to finish the manufacture of the battery.
The width and the distance of the lugs meet the following requirements: after the winding core 11 finishes winding, the adjacent cell tabs 13 form a fan-shaped distribution. As shown in figure 7, within the length L of the pole piece required by completing a winding core, the width of the pole ear 13 is gradually changed, namely W1 < W2 < W3 < -8230, the distance between the pole ears 13 of the battery cell is also gradually changed, namely L1 < L2 < -8230, and the pole ear 13 of the battery cell is formed by the positive pole piece and the negative pole piece according to the mode.
The above-mentioned embodiments are merely illustrative of the preferred embodiments of the present invention, and do not limit the scope of the present invention, and various modifications and improvements of the technical solution of the present invention by those skilled in the art should fall within the protection scope defined by the claims of the present invention without departing from the spirit of the present invention.

Claims (3)

1. The utility model provides a cylindrical many utmost point ears battery which characterized in that: the lithium battery comprises a hollow cylindrical shell (10), a winding core (11) arranged in the shell (10), and an anode end cover (17) and a cathode end cover (12) which are used for sealing the shell (10), wherein the two ends of the winding core (11) are respectively provided with an electric core lug (13), the anode end cover (17) and the cathode end cover (12) are respectively provided with an electric core pole (14) used for leading out current and a flexible connection (15) connected with the electric core pole (14), and the flexible connections (15) of the anode end cover (17) and the cathode end cover (12) are respectively connected with the electric core lug (13) at the end part of the winding core (11) through a current collecting claw (16) positioned at the inner side of the flexible connections;
the battery core lugs (13) are two fan-shaped bosses which are oppositely arranged at the end part of the winding core (11), and the bosses are symmetrically distributed along the axis of the winding core (11);
the current collecting claw (16) comprises a fixed block (161), and a current collecting lug (162) and clamping jaws (163) which are connected with the fixed block (161), the clamping jaws (163) are two groups and are respectively arranged opposite to the battery cell lug (13), each group of clamping jaws (163) consists of two arc-shaped welding rods, the outline shape between the two welding rods is matched with the outline shape of the lug boss, and the current collecting lug (162) is welded with the flexible connection (15);
the battery core tab (13) and the winding core (11) are of an integrated structure.
2. The cylindrical multi-tab battery as claimed in claim 1, wherein: and the positive end cover (17) is provided with a liquid injection hole (171), and the negative end cover (12) is provided with an explosion-proof valve (121).
3. The manufacturing method of the cylindrical multi-lug battery is characterized in that the current collecting claw (16) comprises a fixed block (161), and a current collecting lug (162) and a clamping claw (163) which are connected with the fixed block (161), the clamping claws (163) are two groups and are respectively arranged opposite to the battery cell lug (13), each group of clamping claws (163) consists of two arc-shaped welding rods, the outline shape between the two welding rods is matched with the outline shape of the lug boss, and the current collecting lug (162) is welded with the soft connection (15); the width and the distance of the lugs meet the following requirements: after the winding core is wound, the adjacent tabs form fan-shaped distribution;
the manufacturing method comprises the following steps:
(1) Coating materials on a current collector in a longitudinal continuous coating mode, wherein strip-shaped blanks are arranged on two sides of the current collector and between coating areas, and a battery positive plate and a battery negative plate are manufactured for standby;
(2) Rolling and cutting the coated positive plate and the coated negative plate of the battery, and cutting the blank part into a tab by adopting laser;
(3) Superposing and winding a positive plate, a negative plate and a diaphragm into a cylindrical winding core in a negative plate-diaphragm-positive plate-diaphragm mode, wherein the tabs of the positive plate and the negative plate are respectively positioned at two ends of the winding core;
(4) Assembling and welding a current collecting claw and a tab together, and sticking a high-temperature insulating tape outside the current collecting claw;
(5) Loading the winding core into the shell;
(6) Welding the soft connection of the current collecting claw, the positive end cover and the negative end cover together, and folding the soft connection into a Z shape;
(7) Installing the positive end cover and the negative end cover on the shell, and performing laser welding to manufacture a battery;
(8) Baking, injecting, forming and sealing the battery.
CN201610728934.6A 2016-08-25 2016-08-25 Cylindrical multi-tab battery and manufacturing method thereof Active CN106410104B (en)

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CN107331809B (en) * 2017-06-30 2020-05-26 张红梅 Battery energy storage device and preparation method thereof
CN108550896B (en) * 2018-05-29 2020-12-29 江苏海基新能源股份有限公司 Assembling method of full-lug winding cylindrical lithium ion battery
CN108598354A (en) * 2018-06-13 2018-09-28 东莞塔菲尔新能源科技有限公司 A kind of multi pole ears battery core, multi-terminal battery, battery modules and preparation method thereof
WO2020096973A1 (en) * 2018-11-05 2020-05-14 Tesla, Inc. A cell with a tabless electrode
CN109830737B (en) * 2019-02-23 2021-06-01 镇江成泰自动化科技有限公司 Automatic assembly production method of multi-tab power battery
CN110085778A (en) * 2019-05-30 2019-08-02 广东顺德工业设计研究院(广东顺德创新设计研究院) Battery case, lithium ion battery and Li-ion batteries piles
CN110247123A (en) * 2019-06-17 2019-09-17 合肥国轩高科动力能源有限公司 A kind of core strueture, manufacturing method and battery
CN110600795B (en) * 2019-08-13 2021-09-10 合肥国轩高科动力能源有限公司 Lithium ion cylindrical battery and processing method thereof
CN112259795B (en) * 2020-04-30 2022-02-15 蜂巢能源科技有限公司 Battery cell assembling method and battery cell
CN111834578B (en) * 2020-08-19 2024-04-16 江苏正力新能电池技术有限公司 Array battery cell and assembly method thereof
CN112151732A (en) * 2020-09-30 2020-12-29 星恒电源(滁州)有限公司 Round lithium battery and preparation method thereof
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