CN107221632B - Lithium ion battery with positive and negative electrodes on two sides and manufacturing method thereof - Google Patents
Lithium ion battery with positive and negative electrodes on two sides and manufacturing method thereof Download PDFInfo
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- CN107221632B CN107221632B CN201710368713.7A CN201710368713A CN107221632B CN 107221632 B CN107221632 B CN 107221632B CN 201710368713 A CN201710368713 A CN 201710368713A CN 107221632 B CN107221632 B CN 107221632B
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B23—MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
- B23K—SOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
- B23K20/00—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating
- B23K20/12—Non-electric welding by applying impact or other pressure, with or without the application of heat, e.g. cladding or plating the heat being generated by friction; Friction welding
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
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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
- H01M50/531—Electrode connections inside a battery casing
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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
- H01M50/543—Terminals
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
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Abstract
The application discloses a lithium ion battery with both sides distributed with positive and negative electrodes and a manufacturing method thereof, wherein the lithium ion battery comprises a shell, a naked battery cell, two shell covers, a positive electrode and a negative electrode, wherein the shell is provided with an open structure at the upper end and the lower end; the pole post is provided with a pole lug connecting hole corresponding to the pole lug in a penetrating way, the pole lug extends into the pole lug connecting hole on the pole post, and the pole lug and the pole post are connected together through a friction stir welding process; the shell cover and the shell are also connected together through a friction stir welding process. The battery pole lug and the utmost point post, battery housing and cap problem that exist are connected to adoption ultrasonic bonding and laser technology has been solved to this application, improves the efficiency and the yields of battery production, reduces the equipment input cost in the battery production process.
Description
Technical Field
The application relates to the field of lithium battery production, in particular to a lithium ion battery with positive and negative electrodes on two sides and a manufacturing method thereof.
Background
The welding technology adopted by the lithium ion battery structure mainly comprises ultrasonic welding and laser welding, wherein in the production process of the lithium ion battery, the ultrasonic welding mainly comprises a cell lug welding procedure, namely, an aluminum foil lug and an aluminum pole column are welded together, and a copper foil lug and a copper pole column are welded together, so that the welding is required to be reliable and the internal resistance is small; laser welding is mainly in the shell lid welding process, is with the casing and shell lid welding together, requires that the welding is firm, and the leakproofness is good. At present, the battery structure in the industry adopts an ultrasonic welding mode and a laser welding mode.
Ultrasonic welding is that the metalwork that welds can not too thick, and the solder joint can not too big, often appears the solder joint skew, leak welding, false welding, welds disconnected, welding pulling force and does not accord with unusual phenomenon such as technological requirement, directly influences the yields of product, can cause the uniformity of battery performance relatively poor simultaneously.
Laser welding can face weld mark surface bulging problems, blowhole problems, fire explosion problems, internal bubble problems, and the like. Surface protrusions, air holes, internal air bubbles are fatal to laser welding, and many applications have to be stopped or avoided for these reasons.
More specifically, the cell structure welded by ultrasonic welding and laser welding has the following disadvantages:
1) for a battery with thicker thickness, a plurality of layers of copper-aluminum foils exist in the battery, the prewelding of the plurality of layers of copper-aluminum foils and the welding of the pole columns cannot be suitable for ultrasonic welding, and the welding must be carried out separately, so that the production efficiency is influenced and the cost is increased;
2) the battery structure adopting the ultrasonic welding technology has the advantages that abnormal phenomena such as welding leakage, false welding, welding breakage and welding tension force which do not meet the technological requirements often occur at the joint of a copper-aluminum lug and an electrode post, and when a little abnormal substances exist on the surface of a copper-aluminum foil, the problems of poor welding and poor welding exist in ultrasonic welding, which directly influence the yield of the battery and simultaneously cause poor consistency of the battery performance;
3) the battery structure adopting the ultrasonic welding technology has the advantages that the internal resistance is larger after the copper foil and the copper pole and the aluminum foil and the aluminum pole are subjected to ultrasonic welding, the high-rate charge-discharge performance and the safety performance of the battery are influenced, more space of the battery is occupied, and the capacity and the energy density of the battery are reduced.
4) Adopt the battery structure of laser welding technique, battery case and apron adopt laser welding back probably to lead to the arch, and this can have some influence to the assembly of follow-up technology, and the corner appears the gas pocket most easily during the welding moreover, explodes fire, inside bubble scheduling problem, and the influence is sealed.
5) The battery structure that adopts laser welding technique requires that the welded installation accuracy is high, and the position of light beam on the work piece can not have the skew, if there is the skew, not only leads to welding defect's production very easily, probably leads to laser to pierce through the cap moreover and gets into in the shell, leads to the diaphragm to perforate and arouse the short circuit, leads to potential safety hazards such as catching fire. Laser welding causes cracks, residual stress, deformation, and the like, which all lead to a reduction in mechanical properties at the metal weld, resulting in poor sealing.
6) Adopt ultrasonic bonding and laser technology's battery structure, equipment cost is high, and is disposable high, is unfavorable for the enterprise reduce cost, improves market competition.
Disclosure of Invention
The purpose of this application is: aiming at the problem that the tab and the pole of the battery, the battery shell and the shell cover are connected by adopting ultrasonic welding and laser technology in the prior art, the application provides the lithium ion battery with the positive and negative electrodes on two sides and the manufacturing method of the battery, so that the production efficiency and the yield of the battery are improved, the capacity and the energy density of the battery are improved, the welding quality and the multiplying power discharge performance of the battery are improved, and the equipment investment cost in the production process of the battery is reduced.
In order to achieve the purpose, the technical scheme of the application is as follows:
a lithium ion battery with two sides of positive and negative electrode distribution comprises:
the upper end and the lower end of the shell are both open-structured shells,
accept in the casing, and its upper and lower both ends are equallyd divide and are equipped with the naked electric core of utmost point ear respectively to and
two shell covers which are respectively arranged at the openings of the upper and lower ends of the shell and are provided with pole columns;
the pole post is provided with a pole lug connecting hole corresponding to the pole lug in a penetrating way, the pole lug extends into the pole lug connecting hole on the pole post, and the pole lug and the pole post are connected together through a friction stir welding process; the shell cover and the shell are also connected together through a friction stir welding process.
On the basis of the technical scheme, the lithium ion battery further comprises the following preferable scheme:
utmost point post includes utmost point post body and utmost point post inlay, utmost point post body is fixed in on the shell covers, utmost point ear connecting hole is seted up in on the utmost point post body, utmost point post inlay embedding in the utmost point ear connecting hole.
The tab extends into a gap between the pole and the wall of the tab connecting hole.
The naked electric core is formed by two at least single electric cores and group combinations.
And each shell cover is provided with two polar columns respectively.
Two utmost point posts on one of them cap are the anodal post, and two utmost point posts on the other cap are the negative pole post, the anodal post is aluminium utmost point post, the negative pole post is copper utmost point post.
The pole body and the pole inlay are connected together through a friction stir welding process.
The manufacturing method of the lithium ion battery comprises the following steps:
the tab and the pole of the lithium ion battery are connected together by a friction stir welding process by a friction stir welding machine,
and connecting the shell cover and the shell of the lithium ion battery together by using a friction stir welding process by using a friction stir welding machine.
As preferred, before welding utmost point ear and utmost point post, stretch into utmost point ear connecting hole with utmost point ear, imbed utmost point post inlay in the utmost point ear connecting hole, and make utmost point ear clamp establish in the gap between utmost point post and utmost point ear connecting hole pore wall, then will the friction stir welding of friction stir welding machine head stretches to the seam of utmost point ear and utmost point post, opens the friction stir welding machine and drives the high-frequency motion of friction stir welding head to make the friction stir welding head along utmost point ear and utmost point post the seam removes, thereby makes utmost point ear and utmost point post link together.
Preferably, before the shell cover and the shell are welded, the shell cover is embedded into an opening of the shell, then a friction stir welding head of the friction stir welding machine extends to a joint between the shell cover and the shell, the friction stir welding machine is started to drive the friction stir welding head to move at high frequency, and the friction stir welding head moves along the joint between the shell cover and the shell, so that the shell cover and the shell are connected together.
This application adopts the friction stir welding mode to link together utmost point post and utmost point ear, adopts the friction stir welding mode to link together casing and cap, has following advantage:
1) can solve the disadvantages of the ultrasonic welding technology: the problem of welding a plurality of layers of copper foils and copper pole columns and a plurality of layers of aluminum foils and aluminum pole columns is solved; the problems that welding leakage, false welding and welding breakage frequently occur in tab welding, welding tension does not meet technological requirements and the like are solved; the problems of poor welding and poor welding of ultrasonic welding when a little abnormal substances exist on the surface of the copper-aluminum foil are solved, and the production efficiency, the yield of products and the consistency can be obviously improved in the aspects; the problem of large internal resistance after the copper foil and the copper pole and the aluminum foil and the aluminum pole are subjected to ultrasonic welding is solved, and the charge-discharge rate performance is improved; the space occupied by the ultrasonic welding is reduced, and the capacity and the energy density of the battery can be improved.
2) Can solve the disadvantages of the laser welding technology: the problem that assembly is possibly influenced by a bulge after the battery shell and the cover plate are welded by laser, and sealing is influenced by air holes, fire explosion, internal bubbles and the like which are most easily formed at corners during welding is solved; the problems that the laser penetrates through the shell cover and enters the shell, so that the diaphragm is perforated to cause short circuit, potential safety hazards such as ignition and the like are caused, and poor sealing is caused by cracks, residual stress, deformation and the like are solved;
3) the problems that ultrasonic welding and laser technology equipment is large in investment and high in cost, and common enterprises are difficult to bear are solved, the production cost of the enterprises is reduced, and the market competitiveness is improved.
Drawings
Fig. 1 is a schematic structural diagram of a bare cell in an embodiment of the present application;
fig. 2 is a schematic diagram of a bare cell of a lithium ion battery in an embodiment of the present application;
fig. 3 is a schematic perspective view of a lithium ion battery in an embodiment of the present application;
fig. 4 is a schematic cross-sectional structure diagram of a lithium ion battery in an embodiment of the present application;
FIG. 5 is a schematic view illustrating welding of a tab and a post in an embodiment of the present application;
FIG. 6 is a schematic view illustrating welding of the housing and the housing cover according to an embodiment of the present invention;
wherein: 1-shell, 2-bare cell, 3-tab, 4-shell cover, 5-pole, 501-pole body, 502-pole inlay, 5 a-tab connection hole, 6-single cell, 7-friction stir welding head, 8-positioning fixture, 801-left clamp, 802-right clamp.
Detailed Description
The present application will be described in further detail below with reference to the accompanying drawings by way of specific embodiments. The present application may be embodied in many different forms and is not limited to the embodiments described in the present embodiment. The following detailed description is provided to facilitate a more thorough understanding of the present disclosure, and the words used to indicate orientation, top, bottom, left, right, etc. are used solely to describe the illustrated structure in connection with the accompanying figures.
One skilled in the relevant art will recognize, however, that one or more of the specific details can be omitted, or other methods, components, or materials can be used. In some instances, some embodiments are not described or not described in detail.
Furthermore, the technical features, aspects or characteristics described herein may be combined in any suitable manner in one or more embodiments. It will be readily appreciated by those of skill in the art that the order of the steps or operations of the methods associated with the embodiments provided herein may be varied. Thus, any sequence in the figures and examples is for illustrative purposes only and does not imply a requirement in a certain order unless explicitly stated to require a certain order.
The term "connected", as used herein, includes both direct and indirect connections (couplings), unless otherwise specified.
Fig. 1 to 6 show a preferred embodiment of the lithium ion battery of the present application with two sides of the positive and negative electrode distribution (i.e. the positive electrode and the negative electrode of the battery are respectively located at two opposite sides of the battery), which also includes, as in the conventional battery: the battery comprises a shell 1 with an open structure at the upper end and the lower end, a naked battery cell 2 accommodated in the shell, and two shell covers 4 respectively arranged at the open positions at the upper end and the lower end of the shell. The upper and lower both ends of naked electric core 2 are equallyd divide and are provided with utmost point ear 3 respectively, all are provided with utmost point post 5 on every cap 4. The pole 5 on one of the shell covers 4 is a positive pole, and the pole 5 on the other shell cover 4 is a negative pole; the utmost point ear that is located naked electric core 2 one end is anodal ear, and the utmost point ear that is located naked electric core 2 other ends is the negative pole ear. Specifically, in fig. 3, the tab 3 at the upper end of the bare cell 2 is a positive tab, the tab at the lower end of the bare cell 2 is a negative tab, the post 5 on the housing cover 4 at the opening at the upper end of the housing 1 is a positive post, and the post 5 on the housing cover 4 at the opening at the lower end of the housing 1 is a negative post.
For reasons of view angle obstruction, fig. 3 shows only the housing cover 4 and the pole 5 at the upper end of the housing, and fails to show the housing cover 4 and the pole 5 at the lower end of the housing.
The key improvement of the embodiment is that the tab 3 and the pole 5 are connected together by a friction stir welding process, and the shell cover 4 and the shell 1 are also connected together by a friction stir welding process. Specifically, the pole 5 is provided with a pole lug connecting hole 5a corresponding to the pole lug 3, and the pole lugs 3 extend into the pole lug connecting holes 5a and are connected together through a friction stir welding process.
In this embodiment, the terminal 5 includes a terminal body 501 and a terminal inlay 502, wherein the terminal body 501 is directly fixed on the housing cover 4, the terminal connection hole 5a is opened on the terminal body 501, and the terminal inlay 502 is embedded in the terminal connection hole 5 a.
Further, the tab 3 extends into a gap between the pole 5 and the wall of the tab connecting hole 5 a.
In this embodiment, the bare cell 2 is formed by combining a plurality of single cells 6 (specifically, four single cells in this embodiment, as shown in fig. 1).
Two poles 5 are respectively arranged on each housing cover 4, namely the battery has two positive poles and two negative poles. Wherein, the positive pole is an aluminum pole, and the positive lug correspondingly connected with the positive pole is an aluminum lug. The negative pole column is a copper pole column, and the negative pole lug correspondingly connected with the copper pole column is a copper pole lug.
In this embodiment, the outer contour of the housing 1 is a rectangular structure, the openings at the upper and lower ends are rectangular openings, and the housing cover 4 is a rectangular plate structure.
Referring to fig. 1 to 6 again, the method for manufacturing the lithium ion battery of this embodiment is briefly described as follows:
the most key improvement of the manufacturing method of the lithium ion battery is as follows: the tab 3 and the pole 5 of the lithium ion battery are connected together by a friction stir welding process by using a friction stir welding machine, and the shell cover 4 and the shell 1 of the lithium ion battery are connected together by using the friction stir welding process by using the friction stir welding machine.
Specifically, it is right before utmost point ear 3 and utmost point post 5 weld, utilize the frock to make utmost point ear 3 stretch into utmost point ear connecting hole 5a on utmost point post 5, imbed utmost point post inlay 502 in utmost point ear connecting hole 5a, and make utmost point ear 3 press from both sides and establish in the gap between utmost point post 5 and utmost point ear connecting hole 5a pore wall, then stretch the friction stir welding machine's friction stir welding head to utmost point ear 3 and utmost point post 5's seam (obviously, because utmost point ear 3 and utmost point post 5 are components of a whole that can function independently, when utmost point ear 3 stretches into utmost point post 5, can form the seam between utmost point ear 3 and utmost point post 5 naturally), open the friction stir welding machine and drive friction stir welding head high-frequency motion, and make the friction stir welding head along utmost point ear 3 and utmost point ear 5's. And we also weld together the post inlay 502 and the post body 501 using the friction stir welder. Before welding the shell cover 4 and the shell 1, the shell cover 4 is embedded into the opening of the shell 1 by using a tool (obviously, because the shell cover 4 and the shell 1 are split parts, after the shell cover 4 is embedded into the opening of the shell 1, a seam is formed between the shell cover 4 and the shell 1, and the seam is a closed rectangular ring structure in the overlooking direction of fig. 6), the friction stir welding head 7 of the friction stir welding machine is extended to the seam, the friction stir welding machine is started to drive the friction stir welding head to move at high frequency, and the friction stir welding head is moved along the seam, so that the shell cover 4 and the shell 1 are connected together.
More specifically, single electric core 6 is made through winder or lamination machine to positive plate, negative pole piece and diaphragm, and single electric core 6 passes through and organizes the naked electric core 2 that the combination obtained the technological requirement, then goes into casing 1 with naked electric core 2, packs casing 1 into casing 4, makes the utmost point ear 3 of naked electric core 2 both sides stretch into the utmost point ear connecting hole 5a of utmost point post 5 on the casing 4, imbeds utmost point post inlay 502 in utmost point ear connecting hole 5a, and makes utmost point ear 3 press from both sides in the gap between utmost point post 5 and utmost point ear connecting hole 5a pore wall. The relative positions of the shell 1 and the shell cover 4 are fixed by using the positioning fixture 8, after the positioning is finished, the welding positions of the lugs 3 and the poles 5 are right opposite to the friction stir welding head 7 (the positioning fixture 8 firmly fixes the shell 1 and the shell cover 4), and the friction stir welding head 7 is started to weld along a preset track. After the welding of the tab 3 and the pole 5 is completed, the relative positions of the housing 1 and the housing cover 4 are fixed by the positioning fixture 8, the welding position (the joint between the housing 1 and the housing cover 4) of the housing 1 is opposite to the friction stir welding head 7 (the positioning fixture 8 firmly fixes the housing 1 and the housing cover 4), and the friction stir welding head 7 is started to start welding along the predetermined track.
And taking out the battery after welding to perform sealing and penetration testing.
The positioning fixture 8 comprises a left clamp body 801 and a right clamp body 802, wherein opposite sides of the left clamp body 801 and the right clamp body 802 are respectively provided with a rectangular clamping groove extending inwards, and the size of the rectangular clamping groove is matched with that of the shell 1. In practical application, the rectangular clamping groove on the left clamp body 801 clamps the left side portion of the housing 1, the rectangular clamping groove on the right clamp body 802 clamps the right side portion of the housing 1, the left clamp body 801 and the right clamp body 802 are close to each other to clamp and fix the housing 1, and the housing 1 is clamped and fixed by the housing cover 4 in the housing 1 under the clamping force of the left clamp body 801 and the right clamp body 802, so that the stability of the relative position of the housing 1 and the housing cover 4 in the welding process is ensured.
The foregoing is a more detailed description of the present application in connection with specific embodiments thereof, and it is not intended that the present application be limited to the specific embodiments thereof. It will be apparent to those skilled in the art from this disclosure that many more simple derivations or substitutions can be made without departing from the spirit of the disclosure.
Claims (7)
1. A lithium ion battery with two sides of positive and negative electrode distribution comprises:
a shell (1) with an open structure at the upper end and the lower end,
accept in the casing, and its upper and lower both ends are equallyd divide naked electric core (2) that do not are equipped with utmost point ear (3) to and
two shell covers (4) which are respectively arranged at the openings of the upper and lower ends of the shell and are provided with pole columns (5);
the welding electrode is characterized in that a pole lug connecting hole (5a) corresponding to the pole lug (3) is formed in the pole lug (5) in a penetrating mode, the pole lug (3) extends into the pole lug connecting hole (5a) in the pole lug (5), and the pole lug (3) is connected with the pole lug (5) through a friction stir welding process; the shell cover (4) and the shell body (1) are also connected together through a friction stir welding process;
the pole (5) comprises a pole body (501) and a pole inlay (502), the pole body (501) is fixed on the shell cover (4), the pole connecting hole (5a) is formed in the pole body (501), and the pole inlay (502) is embedded into the pole connecting hole (5 a);
the tab (3) extends into a gap between the pole (5) and the wall of the tab connecting hole (5 a).
2. The lithium ion battery with two distributed positive and negative electrodes of claim 1, wherein the bare cell (2) is formed by combining at least two single cells (6).
3. The lithium ion battery with two distributed positive and negative electrodes as claimed in claim 1, wherein each housing cover (4) is provided with two poles (5).
4. The lithium ion battery with two sides distributed with positive and negative poles according to claim 1, wherein two poles (5) on one of the shell covers (4) are positive poles, two poles (5) on the other shell cover (4) are negative poles, the positive poles are aluminum poles, and the negative poles are copper poles.
5. The lithium ion battery with two sides distributed with positive and negative electrodes as claimed in claim 1, wherein the pole body (501) and the pole inlay (502) are connected together by friction stir welding process.
6. A method for manufacturing the lithium ion battery according to any one of claims 1 to 5, comprising:
connecting a tab (3) and a pole (5) of the lithium ion battery together by using a friction stir welding machine through a friction stir welding process, before welding the tab (3) and the pole (5), extending the tab (3) into a tab connecting hole (5a), embedding a pole inlay (502) into the tab connecting hole (5a), so that the tab (3) is clamped in a gap between the pole (5) and the hole wall of the tab connecting hole (5a), then extending a friction stir welding head of the friction stir welding machine to the seam between the tab (3) and the pole (5), starting the friction stir welding machine to drive the friction stir welding head to move at high frequency, and enabling the friction stir welding head to move along the seam between the tab (3) and the pole (5), so that the tab (3) and the pole (5) are connected together;
and the shell cover (4) of the lithium ion battery is connected with the shell (1) by a friction stir welding process by using a friction stir welding machine.
7. Method according to claim 6, characterized in that before welding the cover (4) to the housing (1), the cover (4) is inserted into the opening of the housing (1), then the friction stir welding head of the friction stir welding machine is extended towards the joint between the cover (4) and the housing (1), the friction stir welding machine is started to drive the friction stir welding head to move at high frequency, and the friction stir welding head is moved along the joint between the cover (4) and the housing (1), so that the cover (4) and the housing (1) are connected together.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710368713.7A CN107221632B (en) | 2017-05-23 | 2017-05-23 | Lithium ion battery with positive and negative electrodes on two sides and manufacturing method thereof |
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| CN201710368713.7A CN107221632B (en) | 2017-05-23 | 2017-05-23 | Lithium ion battery with positive and negative electrodes on two sides and manufacturing method thereof |
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| CN107221632B true CN107221632B (en) | 2020-06-16 |
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| CN108493488A (en) * | 2018-01-27 | 2018-09-04 | 林州朗坤科技有限公司 | A kind of electrochemical appliance and preparation method thereof |
| CN112582755A (en) * | 2019-09-30 | 2021-03-30 | 比亚迪股份有限公司 | Battery module |
| CN113972449B (en) * | 2021-10-25 | 2024-01-30 | 珠海冠宇电池股份有限公司 | Battery and electronic product |
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