CN1264242C - Method for preventing high-capacity square lithium ion battery from bulging - Google Patents
Method for preventing high-capacity square lithium ion battery from bulging Download PDFInfo
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- CN1264242C CN1264242C CNB2003101106880A CN200310110688A CN1264242C CN 1264242 C CN1264242 C CN 1264242C CN B2003101106880 A CNB2003101106880 A CN B2003101106880A CN 200310110688 A CN200310110688 A CN 200310110688A CN 1264242 C CN1264242 C CN 1264242C
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- Prior art keywords
- battery
- lithium ion
- bulging
- square
- ion battery
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- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 title claims abstract description 19
- 229910001416 lithium ion Inorganic materials 0.000 title claims abstract description 19
- 238000000034 method Methods 0.000 title claims abstract description 18
- 230000004888 barrier function Effects 0.000 claims description 10
- 238000003475 lamination Methods 0.000 claims description 3
- 238000012856 packing Methods 0.000 claims description 3
- 238000004804 winding Methods 0.000 abstract 3
- 238000010030 laminating Methods 0.000 abstract 1
- 239000011149 active material Substances 0.000 description 7
- 230000008569 process Effects 0.000 description 5
- 238000012797 qualification Methods 0.000 description 5
- 235000008331 Pinus X rigitaeda Nutrition 0.000 description 4
- 235000011613 Pinus brutia Nutrition 0.000 description 4
- 241000018646 Pinus brutia Species 0.000 description 4
- 230000000694 effects Effects 0.000 description 4
- 238000007599 discharging Methods 0.000 description 3
- 238000005070 sampling Methods 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000003792 electrolyte Substances 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 206010016766 flatulence Diseases 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 239000007773 negative electrode material Substances 0.000 description 2
- 239000007774 positive electrode material Substances 0.000 description 2
- 239000000126 substance Substances 0.000 description 2
- 238000012360 testing method Methods 0.000 description 2
- 238000003466 welding Methods 0.000 description 2
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 description 1
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 239000005030 aluminium foil Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000008901 benefit Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 239000010406 cathode material Substances 0.000 description 1
- 230000010261 cell growth Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000002131 composite material Substances 0.000 description 1
- 238000007796 conventional method Methods 0.000 description 1
- 239000011889 copper foil Substances 0.000 description 1
- 230000006378 damage Effects 0.000 description 1
- 230000007812 deficiency Effects 0.000 description 1
- 230000003467 diminishing effect Effects 0.000 description 1
- 238000009826 distribution Methods 0.000 description 1
- 230000004927 fusion Effects 0.000 description 1
- 238000005213 imbibition Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000012528 membrane Substances 0.000 description 1
- 229910052751 metal Inorganic materials 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 229910001220 stainless steel Inorganic materials 0.000 description 1
- 239000010935 stainless steel Substances 0.000 description 1
Images
Classifications
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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
-
- 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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- Secondary Cells (AREA)
- Battery Electrode And Active Subsutance (AREA)
Abstract
The invention relates to a lithium ion battery, in particular to a method for preventing a square lithium ion battery with large capacity (more than 5Ah) from bulging. The method is characterized in that: assembling the positive plate, the negative plate and the diaphragm into a plurality of small units (3) or winding cores (3) in a laminating or winding manner; then, a plurality of the combination units (3) or the wide surfaces of the winding cores (3) are parallel to the narrow surface (1) of the square shell and are arranged in the square shell. The method for preventing battery bulging effectively controls the size of the battery, eliminates the battery bulging phenomenon, and effectively improves the electrochemical performance of the battery.
Description
Technical field:
The present invention relates to lithium ion battery, particularly a kind of big capacity (＞5Ah) method of square lithium ion battery bulging that prevents.
Background technology:
Square lithium ion battery is to be assembled by positive plate, negative plate, barrier film, electrolyte, square shell and other spare and accessory parts.The three-dimensional dimension of square shell is with wide * thick * high expression, and wherein the direction that makes progress of negative or positive electrode terminal is for high, and size is wideer in other two base, and what size was less is thick.
In the square battery assembling process, generally positive plate, negative plate and the barrier film mode with lamination or coiling is assembled into a plurality of junior units or rolls up core; The profile of these junior units or volume core is square or class is square (as ellipse).Then that several are such assembled unit or volume core are packed in the square shell.Because positive plate, negative plate and barrier film feed into battery case with dry (not imbibition) state group, after battery injected electrolyte, positive plate, negative plate and barrier film can Electolyte-absorptives and expand and make its thickness increase; Simultaneously, in charge and discharge process, the both positive and negative polarity active material is in embedding/when taking off lithium change in volume can take place, thereby also makes unit or volume core thickness that positive plate, negative plate and barrier film are formed increase.Do not having under the situation of operative constraint, be generally 5%-20% because preceding two factors cause the increase of battery unit or volume core thickness.
According to traditional assembly method, as shown in Figure 3: in the unit that positive plate, negative plate and barrier film are formed or volume core when packing the square battery shell into, be to pack in square metal or the plastic casing with square or class rectangular cell unit 3 or volume core 3 wide the direction parallel with the wide * high side 2 of shell.This fit is compressing pole piece to guarantee good electrochemical and to prevent the contradiction that there is tangible deficiency and is difficult to coordinate aspect the cell expansion:
On the one hand, assemble under the tighter situation at battery, because big capacity square battery shell is bigger at broad side surface (wide * height) area, the ability of anti-expand (bulging) is relatively poor, the expansion of battery pole piece can not get effective constraint, tangible bulging phenomenon can take place in battery, thereby the outward appearance of diminishing, be unfavorable for battery assembling even the destruction that causes assembly parts, simultaneously, owing to can not carry out operative constraint to pole piece, fail between the pole piece to compress, ionic conduction ability between the pole piece, electron conduction ability on the pole piece between the active material reduces, thereby the utilance that causes cell active materials is on the low side, large current discharging capability is poor, the internal resistance of cell is bigger, problem such as thermal effect is big in the charge and discharge process;
On the other hand, if adopt the less material of assembling (the battery assembling is pine) to prevent the battery bulging, then can cause the reduction of energy content of battery density, simultaneously because more open between the positive and negative plate of battery, electron conduction ability on ionic conduction ability between the pole piece, the pole piece between the active material reduces, and can cause equally that the utilance of cell active materials is on the low side, large current discharging capability is poor, the internal resistance of cell is big, problems such as thermal effect is big in the charge and discharge process;
Summary of the invention:
The objective of the invention is to provides a kind of method at the weak point of above-mentioned lithium ion battery, makes:
1. the bulging phenomenon of square lithium ion battery is effectively controlled;
2. the positive and negative plate in the square lithium ion battery core is compressed, guarantee the chemical property of battery;
Technical scheme of the present invention is that positive plate, negative plate and the barrier film mode with lamination or coiling is assembled into a plurality of junior units 3 or rolls up core 3 as shown in Figure 1; Wide the leptoprosopy 1 with the square shell of then that several are such assembled unit 3 or volume core 3 is parallel, in the square shell of packing into.
The present invention has following advantage and good effect:
1. battery size is effectively controlled, and has eliminated battery bulging phenomenon.
Adopt the present invention to prevent the method for battery bulging, because the width of square battery is generally 1.5-10 times of thickness, the area of the narrow side of battery is little more a lot of than the area of broad side surface 2, the ability of meteorism resistent is higher than broad side surface 2 far away, and for the broad side surface 2 of battery, because this direction no longer is the direction that pole piece expands and pushes, thereby the bulging phenomenon can not take place.
The overall dimension that table 1 adopts the present invention and conventional art to produce the 10Ah lithium ion battery compares
| Project | Quantity of sampling quantity | The ghost average-size | The battery average-size |
| Conventional art | 50 | 25.0×55.0 | 25.0×58.0 |
| The present invention | 50 | 25.0×55.0 | 25.3×55.0 |
2. the chemical property of battery is effectively improved
Adopt the present invention to prevent the method for battery bulging, because the ability of the narrow side of battery 1 meteorism resistent is higher than broad side surface 2 far away, can effectively compress and retrain battery combination unit 3 or volume core 3, make between positive plate, negative plate and the barrier film contact closely, effectively guaranteed the electron conduction ability between the active material on the ionic conduction ability, pole piece between the pole piece.Thereby draw the impedance, the raising battery positive and negative electrode active material utilization that help reducing inside battery, reduce the internal resistance of cell; Improved large current discharging capability, reduced thermal effect in the charge and discharge process, and guarantee good cyclical stability.
The performance that table 2 adopts the present invention and conventional art to produce the 10Ah lithium-ion-power cell compares
| Project | Quantity of sampling quantity | Battery capacity */Ah | Internal resistance of cell * */m Ω | Threshold voltage/V in the 1C discharge | Performance after 300 times circulates | |
| Capacity/Ah | Internal resistance/m Ω | |||||
| Conventional art 1 (tight assembling) | 20 | 10.5 | 4.8 | 3.648 | 8.0 | 13.6 |
| Conventional art 2 (pine assembling) | 20 | 9.2 | 8.3 | 3.579 | 6.5 | 20.2 |
| The present invention | 50 | 10.5 | 4.5 | 3.693 | 9.2 | 5.6 |
Remarks: * battery capacity test: with reference to lithium ion battery general specification GB/T 18287-2000;
The * internal resistance of cell: be 5mV, the AC impedance under the 1kHz AC signal.
3. the qualification rate of battery production and consistency improve
Adopt traditional tight assembly method, because the battery distortion of assembling back is big, the difference of deflection makes the contact tightness degree difference between the pole piece between the battery, so cell active materials utilance and internal resistance also exist than big-difference, makes that the qualification rate of battery production is low, consistency is relatively poor.
Adopt traditional pine to join technology, then because the loose contact that between the pole piece is, make not only that battery capacity is low, internal resistance is big, charge-discharge performance is poor, and because the unreliability of loose contact between the pole piece, the capacity and the internal resistance of the battery that makes relatively disperse.
The present invention prevents the method for battery bulging, because of little in battery assembling back distortion, size and space are determined, so battery capacity and internal resistance distribution homogeneous are concentrated, thereby the qualification rate of battery and consistency significantly improve, and have improved the performance that is applied to the battery pack on electric motor car or the electric tool.
Consistency and qualification rate that table 3 adopts the present invention and conventional art to produce the 10Ah lithium-ion-power cell compare
| Project | Quantity of sampling quantity | Battery capacity */Ah | The internal resistance of cell/* * m Ω | Accepted product percentage | ||
| Mean value | Average deviation | Mean value | Average deviation | |||
| Conventional art 1 (tight assembling) | 20 | 10.5 | 0.18 | 4.8 | 0.12 | 82％ |
| Conventional art 2 (pine assembling) | 20 | 9.2 | 0.35 | 8.3 | 0.28 | 71％ |
| The present invention | 50 | 10.5 | 0.078 | 4.5 | 0.048 | 97％ |
Remarks: * battery capacity test: with reference to lithium ion battery general specification GB/T 18287-2000;
The * internal resistance of cell: be 5mV, the AC impedance under the 1kHz AC signal.
Description of drawings:
Fig. 1: square lithium ion battery assembling schematic diagram of the present invention.
Fig. 2: lithium ion battery 1C discharge curve.
Fig. 3: the square lithium ion battery schematic diagram of conventional method assembling.
Embodiment:
With the 10Ah square lithium ion battery is example:
Battery case is the stainless steel case of 25mm*55mm*80mm, wall thickness is that 0.4mm positive and negative electrode material adopts homemade power-type lithium ion battery composite positive pole and the nano combined carbon cathode material of high magnification type respectively, and the positive and negative electrode collector is respectively thick aluminium foil of 0.02mm and Copper Foil.
The thickness of battery positive and negative plate is 15 μ m, and membrane thicknesses is 40 μ m, and positive plate, negative plate and barrier film are assembled into wide 23.5mm in the mode of reeling, thick 6.8mm, and height is the volume core 3 of 75mm.
Volume core and battery case are pressed mode and are assembled: 8 volume cores are neat along thickness direction row, compress; Again these volume cores 3 are filled in the square battery shell, made the side of 23.5*75 and the parallel sided of battery case 25*80; And then with positive terminal welding on negative plate and battery case, positive plate and the battery cover, battery case adopts laser fusion welding to arrive with battery cover.
Adopt the lithium-ion-power cell capacity of above structure can reach more than the 10.5Ah, the internal resistance of cell is less than 5m Ω, and the qualification rate of batch process is more than 95%, the high conformity between the battery.
Claims (1)
1. a method that prevents big capacity square lithium ion battery bulging is characterized in that: positive plate, negative plate and the barrier film mode with lamination or coiling is assembled into a plurality of junior units (3) or rolls up core (3); Wide the leptoprosopy (1) with the square shell of then that several are such assembled unit (3) or volume core (3) is parallel, in the square shell of packing into.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101106880A CN1264242C (en) | 2003-12-22 | 2003-12-22 | Method for preventing high-capacity square lithium ion battery from bulging |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB2003101106880A CN1264242C (en) | 2003-12-22 | 2003-12-22 | Method for preventing high-capacity square lithium ion battery from bulging |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1632982A CN1632982A (en) | 2005-06-29 |
| CN1264242C true CN1264242C (en) | 2006-07-12 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB2003101106880A Expired - Fee Related CN1264242C (en) | 2003-12-22 | 2003-12-22 | Method for preventing high-capacity square lithium ion battery from bulging |
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| Country | Link |
|---|---|
| CN (1) | CN1264242C (en) |
Families Citing this family (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100454655C (en) * | 2006-06-13 | 2009-01-21 | 杨成云 | Loose type secondary battery of lithium ion |
| CN201438490U (en) * | 2009-04-30 | 2010-04-14 | 天津市捷威动力工业有限公司 | Lithium ion power battery |
| CN108776311A (en) * | 2018-08-16 | 2018-11-09 | 江苏海基新能源股份有限公司 | A kind of quadrate lithium battery inflatable detection device and detection method |
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- 2003-12-22 CN CNB2003101106880A patent/CN1264242C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1632982A (en) | 2005-06-29 |
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Granted publication date: 20060712 Termination date: 20121222 |