CN107195957A - The lithium ion battery and its preparation method of both positive and negative polarity homonymy arrangement - Google Patents
The lithium ion battery and its preparation method of both positive and negative polarity homonymy arrangement Download PDFInfo
- Publication number
- CN107195957A CN107195957A CN201710369264.8A CN201710369264A CN107195957A CN 107195957 A CN107195957 A CN 107195957A CN 201710369264 A CN201710369264 A CN 201710369264A CN 107195957 A CN107195957 A CN 107195957A
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- Prior art keywords
- lug
- pole
- housing
- cap
- lithium ion
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Classifications
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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
- H01M10/052—Li-accumulators
- H01M10/0525—Rocking-chair batteries, i.e. batteries with lithium insertion or intercalation in both electrodes; Lithium-ion batteries
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M10/00—Secondary cells; Manufacture thereof
- H01M10/05—Accumulators with non-aqueous electrolyte
- H01M10/058—Construction or manufacture
-
- 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
-
- 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
Abstract
This application discloses a kind of lithium ion battery of both positive and negative polarity homonymy arrangement and its preparation method, wherein lithium ion battery includes:Upper end is the housing of uncovered structure, is contained in housing and its left and right sides is equipped with the naked battery core of lug, be placed in housing upper end open-mouth and its left and right sides is provided with the cap of pole；A part for pole is stretched into the housing, and stretches into lug connecting sewing corresponding with the lug is offered on the pole in housing, and lug is stretched into the lug connecting sewing on pole, and lug is linked together with pole by stirring friction-welding technique；Cap links together with housing also by stirring friction-welding technique.The application improves the efficiency and yields of battery production, improves the equipment investment cost in battery capacity and energy density, lifting welding quality and battery multiplying power discharging property, reduction cell production process.
Description
Technical field
The application is related to lithium battery production field, and in particular to the lithium ion battery and its system of a kind of both positive and negative polarity homonymy arrangement
Method.
Background technology
The welding technique essential ultrasound wave soldering that lithium ion battery structure is used connects and laser welding, in lithium ion battery production
During, ultrasonic bonding, mainly in cell polar ear welding sequence, is by aluminium foil lug and aluminium pole, copper foil lug and copper-base post
Weld together, it is desirable to which welding is reliable, and internal resistance is small；Laser welding is main in cap welding sequence, is to weld housing and cap
Together, it is desirable to firm welding, good airproof performance.What current industry battery structure was used is all ultrasonic bonding mode and Laser Welding
Connect mode.
Ultrasonic bonding is that institute's weld metal pieces can not be too thick, and solder joint can not be too big, often occur solder joint skew, solder skip,
Dry joint, weldering are broken, welding pulling force does not meet the anomalies such as technological requirement, the yields of product are directly affected, while electricity can be caused
The uniformity of pond performance is poor.
Laser welding can face welding trace rat problem, stomata problem, fried fiery problem, air entrapment problem etc..Surface
Projection, stomata, air entrapment are the mortal wound of laser welding, and many applications have to stop or try every possible means for these reasons
Evade.
More specifically, welded and had the following disadvantages with the battery structure of laser welding using ultrasonic bonding mode：
1) for the thicker battery of thickness, there is multiple layer of copper aluminium foil inside battery, prewelding and pole for multiple layer of copper aluminium foil
The welding of post can not be applicable ultrasonic bonding, it is necessary to separately be welded, influence production efficiency and increase cost；
2) using the battery structure of ultrasonic welding technique, copper aluminium pole ears and pole junction often occur solder skip, dry joint,
Weldering is disconnected, welding pulling force does not meet the anomalies such as technological requirement, and copper aluminium foil surface is when having a little exotic matter, ultrasonic wave
The problem of welding has failure welding and do not welded, these directly affect the yields of battery, while battery performance can be caused
Uniformity is poor；
3) using the battery structure of ultrasonic welding technique, after copper foil and copper-base post, aluminium foil and aluminium pole ultrasonic bonding
Internal resistance is larger, influence battery high rate charge-discharge performance and security performance, and can occupy the more space of battery, reduction electricity
The capacity and energy density in pond.
4) using the battery structure of laser welding technology, battery container is convex using may result in after laser welding with cover plate
Rise, this assembling to subsequent technique can make some difference, and corner is easiest to stomata, fried fire, air entrapment occur during welding
The problems such as, influence sealing.
5) using the battery structure of laser welding technology, it is desirable to which the installation accuracy of welding is high, orientation of the light beam on workpiece
It can not offset, if there is skew, not only easily lead to the generation of weld defect, and laser penetration cap may be caused to enter
Enter in shell, cause septal perforator to cause short circuit, the potential safety hazard such as cause to catch fire.Laser welding can be cracked, residual stress with
And deformation etc., it can all cause the reduction of metal weld mechanical performance, cause poor sealing.
6) using ultrasonic bonding and the battery structure of laser technology, equipment cost is high, disposable high, is unfavorable for enterprise's drop
Low cost, improves the market competitiveness.
The content of the invention
The purpose of the application is：For in the prior art using ultrasonic bonding and laser technology connection battery pole ear and pole
The problem of post, battery container and cap, the application proposes a kind of lithium ion battery and this battery of both positive and negative polarity homonymy arrangement
Preparation method, improve the efficiency and yields of battery production, improve battery capacity and energy density, lifting welding quality and battery
Equipment investment cost in multiplying power discharging property, reduction cell production process.
In order to achieve the above object, the technical scheme of the application is：
A kind of lithium ion battery of both positive and negative polarity homonymy arrangement, including:
Upper end is the housing of uncovered structure,
It is contained in the housing and its left and right sides is equipped with the naked battery core of lug, and
It is placed in housing upper end open-mouth and its left and right sides is provided with the cap of pole；
The lug on the left of the naked battery core and right side is respectively on the left of anode ear and negative electrode lug, the cap and right side
The pole be respectively positive terminal and negative terminal；
A part for the pole is stretched into the housing, and is stretched into and offered on the pole in the housing and the pole
The corresponding lug connecting sewing of ear, the lug is stretched into the lug connecting sewing on the pole, and the lug and institute
Pole is stated to link together by stirring friction-welding technique；The cap is with the housing also by stirring friction-welding technique
Link together.
This lithium ion battery of the application is on the basis of above-mentioned technical proposal, in addition to following preferred scheme：
The naked battery core is combined by least two single battery cores and group.
Two lug connecting sewings are respectively offered on the positive terminal and the negative terminal.
The positive terminal is aluminium pole, and the anode ear is aluminium pole ears；The negative terminal is copper-base post, and the negative electrode lug is
Copper polar ear.
The outline of the housing is rectangular parallelepiped structure, and the cap is Rectangular Plate Structure.
The lug connecting sewing is linear structure, and length one end of lug connecting sewing is openend.
The preparation method of above-mentioned this lithium ion battery, including：
The lug and pole of the lithium ion battery are connected to using stirring friction-welding technique using friction stir welding machine
Together,
The cap of the lithium ion battery and housing are connected using stirring friction-welding technique using friction stir welding machine
It is connected together.
Before being welded to lug and pole, lug is entered in lug connecting sewing, then by the friction stir welding machine
Agitating friction soldering tip stretches to the seam of lug and pole, opens friction stir welding machine and drives agitating friction weldering head high frequency motion,
And the seam of the agitating friction soldering tip along lug and pole is moved, so that lug and pole link together.
Before being welded to the cap and housing, the upper end that the cap is embedded in into the housing is open interior, then will
The agitating friction soldering tip of the friction stir welding machine stretches to the seam of the cap and housing, opens friction stir welding machine and drives
Agitating friction weldering head high frequency motion, and agitating friction soldering tip is moved along the seam between cap and housing, so that
Cap and housing link together.
Load described after the welding of the lug and pole is completed, then by the naked battery core, lug, pole and end cap
In housing, then carry out the welding of the end cap and the housing.
The application is linked together pole and lug using agitating friction welding mode, and mode is welded using agitating friction
Housing and cap are linked together, had the advantage that：
1) the drawbacks of existing battery structure is existed using ultrasonic welding technique can be solved：Solve multilayer copper foil and copper-base
Post, the problem of laminated aluminium foil is welded with aluminium pole；The problem of solving failure welding；Improve production efficiency, the non-defective unit of product
Rate and uniformity；Improve charge-discharge magnification performance；Improve the capacity and energy density of battery.
2) the drawbacks of existing battery structure is existed using laser welding technology can be solved：Solve assembling and poor sealing
Problem；Improve security performance；
3) solve ultrasonic bonding and laser technology equipment investment is big, cost is high, the problem of general enterprises are difficult to bear, drop
Low enterprise's production cost and improve the market competitiveness.
Brief description of the drawings
Fig. 1 is the structural representation of naked battery core in the embodiment of the present application；
Fig. 2 is the structural representation of cap in the embodiment of the present application；
Fig. 3 is the cooperation schematic diagram of lug and pole in the embodiment of the present application；
Fig. 4 is the welding schematic diagram of lug and pole in the embodiment of the present application；
Fig. 5 is that naked battery core enters shell schematic diagram in the embodiment of the present application；
Fig. 6 is the welding schematic diagram of housing and cap in the embodiment of the present application；
Fig. 7 is the dimensional structure diagram of lithium ion battery in the embodiment of the present application；
Wherein：1- housings, the naked battery cores of 2-, 3- lugs, 4- caps, 5- poles, 5a- lug connecting sewings, 5b- fixtures, which are installed, to slit
Mouthful, the mono- battery cores of 6-, 7- agitating friction soldering tips, the left clamps of 801-, 802- right clamping bodies, 803- centres clamp, 901- front clamps, 902-
Back clamp.
Embodiment
The application is described in further detail below by embodiment combination accompanying drawing.The application can be with a variety of
Different forms is realized, however it is not limited to embodiment described by the present embodiment.The purpose of detailed description below is provided
It is easy for becoming apparent from present disclosure thorough explanation, the words of the wherein indicating position such as upper and lower, left and right is only pin
To shown structure in respective figure for position.
However, those skilled in the art may be aware that one or more detail description can be by
Omit, or can also be using other methods, component or material.In some instances, some embodiments are not described
Or be not described later in detail.
In addition, technical characteristic described herein, technical scheme can also be closed arbitrarily in one or more embodiments
Suitable mode is combined.For those skilled in the art, it is easy to understand with provided herein is embodiment relevant method
Step or operation order can also change.Therefore, any order in drawings and examples is merely illustrative purposes, not secretly
Show requirement in a certain order, require unless expressly stated according to a certain order.
" connection " described in the application, unless otherwise instructed, including directly or indirectly connecting (connection).
Fig. 1 to Fig. 7 shows that (i.e. the positive pole and negative pole of battery are located at the same of battery to this both positive and negative polarity homonymy arrangement of the application
Side) lithium ion battery a preferred embodiment, be that it also includes with conventional batteries identical：Upper end is open knot
The housing 1 of structure, the naked battery core 2 being contained in the housing and the cap 4 being arranged on the housing at open at both ends.Its
In, the left and right sides of naked battery core 2 is respectively provided with lug 3, and the left and right sides of cap 4 is provided with pole 5.Wherein, naked electricity
The lug 3 in the left side of core 2 is anode ear, and the lug 3 on the naked right side of battery core 2 is negative electrode lug.The pole 5 in the left side of cap 4 is positive terminal, shell
The pole 5 on the right side of lid 4 is negative terminal.
Blocked because of visual angle and the lug 3 and pole 5 of side are illustrate only in reason, Fig. 3, fail that the lug 3 of opposite side is shown
With pole 5.
The key improvements of the present embodiment are that lug 3 is linked together with pole 5 by stirring friction-welding technique, shell
Lid 4 links together with housing 1 also by stirring friction-welding technique.Specifically, offered on pole 5 corresponding with lug 3
Linear lug connecting sewing 5a, lug 3 is stretched into lug connecting sewing 5a and linked together by stirring friction-welding technique.
Specifically, a part for pole 5 is stretched into housing 1, and is stretched into and offered on the pole 5 in housing 1 and the corresponding lug of lug 3
Connecting sewing 5a, lug 3 is stretched into the lug connecting sewing 5a on pole 5 and linked together by stirring friction-welding technique.
In the present embodiment, above-mentioned naked battery core 2 is by multiple single battery cores 6 (the present embodiment is specially four, such as Fig. 1) and combines
Form.
Two lug connecting sewing 5a are respectively offered on positive terminal and negative terminal, numerous lugs in the naked left side of battery core 2 are (just
Lug) it is respectively protruding into two lug connecting sewing 5a of positive terminal and is linked together by stirring friction-welding technique, naked electricity
Numerous lugs (negative electrode lug) on the right side of core 2 are respectively protruding into two lug connecting sewing 5a of negative terminal and welded by agitating friction
Technique links together.
In the present embodiment, the positive terminal is aluminium pole, and the anode ear that connection is corresponded to therewith is aluminium pole ears.Negative terminal is copper
Pole, the negative electrode lug that connection is corresponded to therewith is copper polar ear.
In the present embodiment, the outline of housing 1 is rectangular parallelepiped structure, and the opening of its upper end is open for rectangle, and cap 4 is square
The hardened structure of shape.
Lug connecting sewing 5a length one end is openend, such as Fig. 4 in the present embodiment.So it may be such that lug 3 can be more
Easily stretch into lug connecting sewing 5a.
During in order that must be welded to lug and pole, more easily the position of lug 3 can be positioned, this implementation
The fixture that example is further opened with being located between two lug connecting sewing 5a on pole 5 installs gap 5b.
Refer again to shown in Fig. 1 to Fig. 7, be now simply described below the preparation method of this lithium ion battery of the present embodiment：
The most critical of the lithium ion battery preparation method, which is improved, to be：Welded using friction stir welding machine using agitating friction
Technique links together the lug 3 and pole 5 of the lithium ion battery, while being rubbed using friction stir welding machine using stirring
Wipe welding procedure the cap 4 and housing 1 of the lithium ion battery link together.
Specifically, such as Fig. 3, before being welded to lug 3 and pole 5, the lug connecting sewing that lug 3 is stretched on pole 5
In 5a, and the relative position for fixing lug 3 and pole 5 using lug pole positioning fixture for welding (is prevented in welding process
The two is relatively moved, it is ensured that welding quality), the agitating friction soldering tip 7 of friction stir welding machine is then stretched into lug 3 and pole 5
Seam (obviously, because lug 3 and pole 5 are split part, when lug 3 is stretched into the lug connecting sewing 5a of pole 5, from
Seam so can be formed between lug 3 and pole 5), open friction stir welding machine and drive agitating friction weldering head high frequency motion, and
Move the seam of the agitating friction soldering tip along lug 3 and pole 5, so that lug 3 and pole 5 link together.
Load the shell after the welding of lug 3 and pole 5 is completed, then by naked battery core 2, lug 3, pole 5 and end cap 4
In body 1, then carry out the welding of the end cap 4 and the housing 1.Such as Fig. 6, before being welded to cap 4 and housing 1, by cap 4
In the opening of embedded housing 1 (obviously, because cap 4 and housing 1 are split part, after cap 4 is embedded in the opening of housing 1,
Nature can form seam between cap 4 and housing 1, and this seam is in the rectangle ring structure that Fig. 6 overlook direction is closure),
The relative position for fixing cap 4 and housing 1 using housing cap positioning fixture for welding (prevents that the two is relative in welding process
It is mobile, it is ensured that welding quality).The agitating friction soldering tip 7 of friction stir welding machine is stretched into the seam, friction stir welding machine is opened
And agitating friction weldering head high frequency motion is driven, and agitating friction soldering tip is moved along seam, so that cap 4 and housing 1 connect
It is connected together.
Battery is taken out after the completion of welding and carries out sealing and fusion penetration test.
The production method of above-mentioned naked battery core 2 is traditional approach：Positive plate, negative plate and barrier film pass through up- coiler or laminating machine
Be made single battery core 6, single battery core 6 by and combine and obtain technological requirement and naked battery core 2 with positive and negative lug.
Such as Fig. 4, above-mentioned lug pole positioning fixture for welding includes left clamp 801, right clamping body 802 and middle clamp 803.It is right
When lug and pole welding, above-mentioned left clamp 801 and right clamping body 802 are arranged in outside the left and right two of pole 5 in Fig. 4
Side, is arranged in foregoing fixture by middle clamp 803 and installs at gap 5b.And left clamp 801, right clamping body 802 and middle clamp
803 compress lug 3, to ensure positional stability of the lug 3 in welding process, such as Fig. 4.
Such as Fig. 6, above-mentioned housing cap positioning fixture for welding includes front clamp 901 and back clamp 902, and front clamp 901 is with after
The opposite side of clamp 902 respectively offers the rectangle neck extended internally, and the size of rectangle neck is adapted with housing 1.It is real
When border is applied, the rectangle neck that the rectangle neck on front clamp 901 is blocked on the front side portion of housing 1, back clamp 902 blocks housing
1 rear lateral portion, front clamp 901 and back clamp 902 are close to each other and housing 1 is fixedly clamped, and housing 1 is by front clamp
901 and back clamp 902 intensifying force and the cap 4 in it is also fixedly clamped, and then ensure that housing 1 in welding process
With the stability of the relative position of cap 4.
Above content is to combine the further description that specific embodiment is made to the application, it is impossible to assert this Shen
Specific implementation please is confined to these explanations.For the application person of an ordinary skill in the technical field, do not taking off
On the premise of from the application design, some simple deduction or replace can also be made.
Claims (10)
1. a kind of lithium ion battery of both positive and negative polarity homonymy arrangement, including:
Upper end is the housing (1) of uncovered structure,
It is contained in the housing and its left and right sides is equipped with the naked battery core (2) of lug (3), and
It is placed in housing upper end open-mouth and its left and right sides is provided with the cap (4) of pole (5)；
The lug (3) on the left of the naked battery core (2) and right side is respectively on the left of anode ear and negative electrode lug, the cap (4)
The pole (5) with right side is respectively positive terminal and negative terminal；
Characterized in that, a part for the pole (5) is stretched into the housing (1), and the pole stretched into the housing (1)
(5) lug connecting sewing (5a) corresponding with the lug (3), the institute that the lug (3) is stretched on the pole (5) are offered on
State in lug connecting sewing (5a), and the lug (3) is connected to one with the pole (5) by stirring friction-welding technique
Rise；The cap (4) links together with the housing (1) also by stirring friction-welding technique.
2. the lithium ion battery of both positive and negative polarity homonymy arrangement according to claim 1, the naked battery core (2) is single by least two
Battery core (6) and group is combined.
3. the lithium ion battery of both positive and negative polarity homonymy arrangement according to claim 1, it is characterised in that the positive terminal and institute
State and two lug connecting sewings (5a) are respectively offered on negative terminal.
4. the lithium ion battery of both positive and negative polarity homonymy arrangement according to claim 1, it is characterised in that on the pole (5)
The fixture for being further opened with being located between two lug connecting sewings (5a) installs gap (5b).
5. the lithium ion battery of both positive and negative polarity homonymy arrangement according to claim 3, it is characterised in that the positive terminal is aluminium
Pole, the anode ear is aluminium pole ears；The negative terminal is copper-base post, and the negative electrode lug is copper polar ear.
6. the lithium ion battery of both positive and negative polarity homonymy arrangement according to claim 1, it is characterised in that the lug connecting sewing
(5a) is linear structure, and length one end of lug connecting sewing (5a) is openend.
7. a kind of preparation method of the lithium ion battery as described in any in claim 1 to 6, it is characterised in that including：
The lug (3) of the lithium ion battery and pole (5) are connected using stirring friction-welding technique using friction stir welding machine
Together,
Stirring friction-welding technique is used by the cap (4) and housing (1) of the lithium ion battery using friction stir welding machine
Link together.
8. preparation method according to claim 7, it is characterised in that before being welded to lug (3) and pole (5), will
Lug (3) is stretched into lug connecting sewing (5a), then by the agitating friction soldering tip of the friction stir welding machine stretch to lug (3) and
The seam of pole (5), open friction stir welding machine and drive agitating friction weldering head high frequency motion, and make agitating friction soldering tip along
The seam movement of lug (3) and pole (5), so that lug (3) and pole (5) link together.
9. preparation method according to claim 7, it is characterised in that welded to the cap (4) and housing (1)
Before, the upper end of the embedded housing (1) of the cap (4) is open interior, then by the agitating friction of the friction stir welding machine
Soldering tip stretches to the seam of the cap (4) and housing (1), opens friction stir welding machine and drives agitating friction weldering head height frequency fortune
It is dynamic, and agitating friction soldering tip is moved along the seam between cap (4) and housing (1), so that cap (4) and housing
(1) link together.
10. preparation method according to claim 7, it is characterised in that complete the weldering of the lug (3) and pole (5)
After connecing, then the naked battery core (2), lug (3), pole (5) and end cap (4) be fitted into the housing (1), then carried out described
The welding of end cap (4) and the housing (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710369264.8A CN107195957A (en) | 2017-05-23 | 2017-05-23 | The lithium ion battery and its preparation method of both positive and negative polarity homonymy arrangement |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710369264.8A CN107195957A (en) | 2017-05-23 | 2017-05-23 | The lithium ion battery and its preparation method of both positive and negative polarity homonymy arrangement |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114985927A (en) * | 2022-05-31 | 2022-09-02 | 广东利元亨技术有限公司 | Welding device and welding method for battery cell |
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