CN212136591U - Lithium ion battery positive pole piece and lithium ion battery - Google Patents
Lithium ion battery positive pole piece and lithium ion battery Download PDFInfo
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- CN212136591U CN212136591U CN202020912727.8U CN202020912727U CN212136591U CN 212136591 U CN212136591 U CN 212136591U CN 202020912727 U CN202020912727 U CN 202020912727U CN 212136591 U CN212136591 U CN 212136591U
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- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
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Abstract
The utility model discloses a lithium ion battery positive pole piece and lithium ion battery belongs to lithium ion battery pole piece technical field. It includes anodal metal forming, anodal coating, first utmost point ear and second utmost point ear, and anodal coating is on anodal metal forming, and anodal metal forming both ends do not carry out anodal coating, and first utmost point ear sets up respectively on anodal metal forming with the second utmost point ear, and the width of first utmost point ear is different with the second utmost point ear, realizes the heat control to battery inside through heat production and heat dissipation two aspects.
Description
Technical Field
The utility model belongs to the technical field of the lithium ion battery pole piece, more specifically say, relate to a lithium ion battery positive pole piece and lithium ion battery.
Background
With the gradual popularization of electronic products such as mobile phones, digital products, electric vehicles and the like, lithium ion batteries play an increasingly important role in the life of people. The existing lithium ion battery is generally suffered from problems of low energy density, limited cycle life and the like, but compared with the problems, the problem of battery safety is important to solve.
The cylindrical lithium ion battery is a secondary battery which can be repeatedly charged and discharged and is prepared by winding a positive plate, a negative plate and a diaphragm into a cylindrical winding core layer by layer through a winding machine and performing the processes of casing, assembling, liquid injection, sealing, formation and the like. Due to the compact layer-by-layer winding structure, the cylindrical lithium ion battery has poor heat dissipation and high temperature accumulation in the charging and discharging processes, and particularly has more obvious performance under high-rate charging and discharging. How to reduce the charging and discharging temperature rise of the cylindrical lithium ion battery and improve the multiplying power charging and discharging capacity is very important.
The Chinese patent application numbers are: 201320689684.1, the announcement date is: 2014.07.09, the negative plate and secondary battery comprises a negative conductive substrate, a negative active layer and a conductive base band; the surface of the negative conductive substrate is provided with a powdering area and a powder-free area, the powder-free area is covered by the negative active layer, and the powder-free area is not covered by the negative active layer; one end of the conductive base band is fixed on the non-powdering area, and the other end of the conductive base band extends out of the negative conductive substrate. According to the battery negative plate, the conductive base band connects the negative plate with the battery shell as a negative electrode, so that the contact area and the contact strength of the negative plate and the battery shell are increased, the conductivity and the current collection effect of the negative plate are improved, and the heat dissipation of a pole group in the battery through the battery shell is facilitated; however, when the pole piece is used for manufacturing a cylindrical lithium ion battery, the internal heat dissipation effect is poor.
The Chinese patent application numbers are: 201521127331.8, the announcement date is: 2016.09.28, which comprises four parts of a positive active material coating, an ML positive current collector, a positive tab, a T-shaped positive tab insulating tape and the like. The positive active substance coating is composed of modified lithium nickel manganese oxide, SPS conductive agent and PVdE adhesive, the positive active substance coating is coated on one side or two sides and is adhered to the ML current collector to form a whole, a positive electrode tab is welded to the ML current collector to form a whole through laser welding or ultrasonic welding, and a positive insulating tape is adhered to the tab and is connected with an electrode pole piece to form a whole. By using the modified lithium nickel manganese oxide, the SPS conductive agent, the ML current collector and the T-shaped tab adhesive tape, the positive active material is stable under extreme conditions, the ML current collector effectively dissipates heat, the T-shaped insulating adhesive delays the edge shrinkage of the battery diaphragm, and the large-current charging and discharging effect, the cycle service life and the safety of the produced power battery are improved; however, as the internal winding core material of the cylindrical lithium ion battery, due to the winding core winding effect, the internal heat dissipation effect is poor, and the service performance of the lithium ion battery is affected.
Disclosure of Invention
1. Problems to be solved
To in the current lithium ion battery pole piece use, the problem that the heat can not fine control, the utility model provides a lithium ion battery positive pole piece and lithium ion battery. The heat control to the inside of the battery is realized through two aspects of heat generation and heat dissipation.
2. Technical scheme
In order to solve the above problems, the utility model adopts the following technical proposal.
The utility model discloses a lithium ion battery positive pole piece, including anodal metallic foil, anodal coating, first utmost point ear and second utmost point ear, anodal coating is in on the anodal metallic foil, and anodal metallic foil both ends do not carry out the coating of anodal coating, first utmost point ear sets up on anodal metallic foil respectively with the second utmost point ear, and the width of first utmost point ear and second utmost point ear is different.
As a further embodiment of the present invention, the ratio of the width of the first tab to the width of the second tab is 1.2-1.6.
As a further embodiment of the present invention, the positive electrode metal foil is an aluminum foil.
As a further embodiment of the present invention, the positive coating includes a first positive coating, a second positive coating and a third positive coating, wherein the first positive coating, the first tab, the second positive coating, the second tab and the third positive coating are sequentially mounted on the positive foil.
As a further implementation scheme of the utility model, first utmost point ear and anodal coating one and anodal coating two between all be equipped with and leave white, second utmost point ear and anodal coating two and anodal coating three between all be equipped with and leave white.
The utility model discloses a lithium ion battery, including the anodal pole piece of a lithium ion battery of above-mentioned arbitrary.
3. Advantageous effects
Compared with the prior art, the beneficial effects of the utility model are that:
(1) the utility model discloses a lithium ion battery anode piece, cylindrical lithium ion battery inner pole piece is because of the reason of coiling, and the inner space is narrow and small, and the heat that conventional pole piece produced can not obtain the release, and the inside heat dissipation of battery is difficult, produces the influence to the multiplying power performance of battery, realizes the heat control to the battery inside through heat production and heat dissipation two aspects;
(2) the utility model discloses a lithium ion battery positive pole piece, at positive pole piece both ends tip not carry out the coating of positive coating, leave white for the both ends of positive pole piece, do not influence the use of whole pole piece, do not have the covering of positive coating, its heat can obtain fine conduction, realizes the radiating effect of aluminium foil;
(3) the utility model discloses a lithium ion battery positive pole piece, negative pole piece need wrap up positive pole piece in the negative pole piece outside positive pole piece and negative pole piece in the coiling process, because negative pole piece inflation and contraction when curling power and charging and discharging causes the negative pole piece that corresponds in positive pole piece both ends easily, positive pole piece both ends do not carry on the coating of positive coating except can strengthen the radiating effect of aluminium foil, can make positive pole piece both ends correspond negative pole piece atress littleer simultaneously, reduce the possibility that produces the negative pole piece;
(4) the utility model discloses a lithium ion battery positive pole piece, set up the bipolar lug structure on the pole piece and can reduce the internal resistance, and then reduce the production of heat, but the pole piece of bipolar lug needs to be connected with cylindrical lithium ion battery's casing after welding two utmost points ear, in the welding process of carrying out two utmost points ear, the utmost point ear of equal specification is generally adopted, the position requirement between two utmost point ears at this moment is comparatively strict, once the utmost point ear position takes place the dislocation, can produce the influence to utmost point ear electric conductivity, resistance increase, the heat production increases, increase cylindrical lithium ion battery heat dissipation burden, set up to the width difference to two utmost point ears, require lower to its position error, realize very easily that the little utmost point ear of width welds on the utmost point ear of great width completely, reduce because the production of welding the internal resistance, reduce the;
(5) the utility model discloses a lithium ion battery positive pole piece, the width ratio of the width of first utmost point ear and the width of second utmost point ear is 1.2-1.6, guarantees certain width ratio, can weld the second utmost point ear on first utmost point ear, reduces because the internal resistance that the welding produced, also can not produce the influence to the performance of second utmost point ear;
(6) the utility model discloses a lithium ion battery is using the utility model discloses a behind the positive pole piece, can reduce the inside heat production of battery, strengthen its heat dispersion to reduce the possibility that the negative pole fragment takes place.
Drawings
Fig. 1 is a schematic diagram of a side structure of a tab of a positive electrode plate of a lithium ion battery in embodiment 1;
fig. 2 is a schematic diagram of the overall structure of a positive electrode plate of a lithium ion battery in embodiment 1;
fig. 3 is a schematic diagram of a side structure of one side of a tab of a negative electrode plate of a lithium ion battery in embodiment 5;
fig. 4 is a schematic diagram of the overall structure of a negative electrode plate of a lithium ion battery in example 5.
In the drawings: 10. aluminum foil; 11. coating a positive electrode I; 12. a second positive electrode coating; 13. coating a positive electrode layer III; 14. a first tab; 15. a second tab;
20. copper foil; 21. a negative electrode coating; 22. a third tab; 23. and a fourth tab.
Detailed Description
The present invention will be further described with reference to the following specific embodiments.
The position of first utmost point ear, second utmost point ear, third utmost point ear and fourth utmost point ear on the pole piece of this application does not all make specially, and first utmost point ear is for the width broad of second utmost point ear, and the third utmost point ear is for the width broad of fourth utmost point ear.
Example 1
As shown in fig. 1 and 2, a lithium ion battery positive electrode plate of this embodiment includes a positive electrode metal foil, a positive electrode coating, a first tab 14 and a second tab 15, the positive electrode metal foil is an aluminum foil 10 with a thickness of about 15um, the positive electrode coating is a positive electrode active material, a conductive agent binder is made by processes of homogenizing, coating, etc., for the existing coating, the first tab 14 and the second tab 15 are both made of aluminum, the first tab 14 has a width of 7mm, the second tab 15 has a width of 5mm, a bipolar tab structure is provided on the electrode plate to reduce internal resistance and further reduce heat generation, but the electrode plate of the bipolar tab needs to be connected with a cylindrical lithium ion battery shell after two tabs are welded, in the process of welding the two tabs, tabs with the same specification are generally used, at this time, the position requirement between the two tabs is strict, and once the positions of the tabs are dislocated, can exert an influence on the electric conductivity of the electrode lug, increase the resistance, increase the heat production, increase the heat dissipation burden of the cylindrical lithium ion battery, set the width of two electrode lugs to be different, have lower requirements on the position error, realize that the electrode lug with small width is completely welded on the electrode lug with large width, reduce the heat production due to the production of welding internal resistance. The ratio of the width of the first tab 14 to the width of the second tab 15 is 1.2-1.6, a certain width ratio is ensured, the second tab 15 can be welded on the first tab 14, the internal resistance generated by welding is reduced, and the use performance of the second tab 15 cannot be influenced.
The positive coating comprises a first positive coating 11, a second positive coating 12 and a third positive coating 13, and the first positive coating 11, the first tab 14, the second positive coating 12, the second tab 15 and the third positive coating 13 are sequentially arranged on the aluminum foil 10. And the two ends of the aluminum foil 10 are not coated with the anode coatings, white is arranged between the first tab 14 and the first anode coating 11 and between the first tab and the second anode coating 12, and white is arranged between the second tab 15 and the second anode coating 12 and between the second tab and the third anode coating 13. The pole piece inside the cylindrical lithium ion battery is narrow and small in internal space due to the winding reason, heat generated by the conventional pole piece cannot be released, the heat dissipation inside the battery is difficult, the multiplying power performance of the battery is influenced, and the heat control inside the battery is realized through heat production and heat dissipation. The coating of the positive coating is not carried out on the end parts of the two ends of the positive pole piece, namely, the two ends of the positive pole piece are left white, the use of the whole pole piece is not influenced, the covering of the positive coating is avoided, the heat can be well conducted, and the heat dissipation effect of the aluminum foil 10 is realized. The negative pole piece need the cladding live positive pole piece in the outside of positive pole piece and negative pole piece among the coiling process, because negative pole piece expansion and contraction when curling power and charge-discharge causes positive pole piece both ends to correspond the department negative pole piece easily, the positive pole piece both ends do not carry out the coating of positive coating except can strengthening the radiating effect of aluminium foil 10, can make positive pole piece both ends correspond the department negative pole piece atress littleer simultaneously, reduce the possibility that produces the negative pole piece.
When the lithium ion battery positive plate is assembled into a battery, the length of the first tab 14 is larger than that of the second tab 15, the second tab 15 can be welded to the first tab 14 and then welded with the cap, internal resistance is lower, flow conductivity is high, and heat generation in use is reduced.
Example 2
The structure of this embodiment is substantially the same as that of embodiment 1, except that the width of the first tab 14 is 8mm, and the width of the second tab 15 is 5 mm.
Example 3
The structure of this embodiment is substantially the same as that of embodiment 1, except that the width of the first tab 14 is 6mm, and the width of the second tab 15 is 5 mm.
Example 4
After the lithium ion battery of this embodiment uses the positive electrode tab of any one of embodiments 1 to 3, heat generation inside the battery can be reduced, heat dissipation performance of the battery can be enhanced, and the possibility of occurrence of negative electrode tabs can be reduced.
Example 5
As shown in fig. 3 and 4, the negative electrode plate of the lithium ion battery of the present embodiment includes a negative electrode metal foil, a negative electrode coating 21, a third tab 22 and a fourth tab 23, the negative electrode metal foil is a copper foil 20 with a thickness of about 10 μm, the negative electrode coating 21 is an existing coating, the third tab 22 and the fourth tab 23 are made of copper and nickel, the width of the third tab 22 is 4mm, the width of the fourth tab 23 is 3mm, and a bipolar tab structure is disposed on the negative electrode plate to reduce internal resistance and further reduce heat generation, but the double-tab electrode plate needs to connect two tabs after welding with a casing of a cylindrical lithium ion battery, and in the process of welding the two tabs, tabs with the same specification are generally adopted, and at this time, the position requirement between the two tabs is strict, and once the tab position is dislocated, the conductive performance of the tabs is affected, and the resistance is increased, the heat production increases, increases cylindrical lithium ion battery heat dissipation burden, sets to the width difference to two utmost point ears, and is lower to its position error requirement, realizes very easily that the utmost point ear that the width is little welds on the utmost point ear that the width is big completely, reduces because the production of welding internal resistance reduces the heat production. The ratio of the width of the third tab 22 to the width of the fourth tab 23 is 1.2-1.6, a certain width ratio is ensured, the fourth tab 23 can be welded on the third tab 22, and the influence on the use performance of the fourth tab 23 due to the internal resistance generated by welding is reduced.
The third tab 22, the negative coating 21 and the fourth tab 23 are sequentially disposed on the copper foil 20, and a margin is provided between the negative coating 21 and the third tab 22 and the fourth tab 23. The pole piece inside the cylindrical lithium ion battery is narrow and small in internal space due to the winding reason, heat generated by the conventional pole piece cannot be released, the heat dissipation inside the battery is difficult, the multiplying power performance of the battery is influenced, and the heat control inside the battery is realized through heat production and heat dissipation. The middle part is the negative pole coating 21, and both ends are utmost point ear, through set up the mode of leaving white between negative pole coating 21 and third utmost point ear 22 and fourth utmost point ear 23, the mode of leaving white can strengthen the heat dissipation function of negative pole piece, and does not influence the use of whole pole piece. The end surface of the copper foil 20 is exposed without being covered by the negative coating 21, so that the heat can be well conducted, and the heat dissipation effect of the copper foil 20 is realized.
When the lithium ion battery negative plate is assembled into a battery, the length of the first tab 14 is larger than that of the second tab 15, the second tab 15 can be welded on the first tab 14 and then welded at the bottom of the steel shell, internal resistance is lower, flow conductivity is high, and heat generation in use is reduced.
Example 6
The structure of this embodiment is substantially the same as that of embodiment 5, except that the width of the first tab 14 is 3.6mm, and the width of the second tab 15 is 3 mm.
Example 7
The structure of this embodiment is substantially the same as that of embodiment 5, except that the width of the first tab 14 is 4.8mm, and the width of the second tab 15 is 3 mm.
Example 8
In the lithium ion battery of this embodiment, after the negative electrode tab of any one of embodiments 5 to 7 is used, heat generation inside the battery can be reduced, and the heat dissipation performance of the battery can be enhanced.
The above examples describe the present invention and its embodiments, and the description is not intended to be limiting. It should be noted that, for those skilled in the art, without departing from the inventive concept of the present invention, the structural modes and embodiments similar to the technical solutions should be designed without creativity, and all shall fall within the protection scope of the present invention.
Claims (6)
1. The utility model provides a lithium ion battery positive pole piece which characterized in that: including anodal metal forming, anodal coating, first utmost point ear (14) and second utmost point ear (15), anodal coating is in on the anodal metal forming, and anodal metal forming both ends do not carry out anodal coating, first utmost point ear (14) set up respectively on anodal metal forming with second utmost point ear (15), and the width of first utmost point ear (14) and second utmost point ear (15) is different.
2. The positive pole piece of the lithium ion battery of claim 1, characterized in that: the ratio of the width of the first tab (14) to the width of the second tab (15) is 1.2-1.6.
3. The positive pole piece of the lithium ion battery of claim 1, characterized in that: the positive electrode metal foil is an aluminum foil (10).
4. The positive electrode plate of the lithium ion battery according to any one of claims 1 to 3, characterized in that: the positive coating comprises a first positive coating (11), a second positive coating (12) and a third positive coating (13), wherein the first positive coating (11), the first tab (14), the second positive coating (12), the second tab (15) and the third positive coating (13) are sequentially arranged on the positive metal foil.
5. The lithium ion battery positive pole piece of claim 4, characterized in that: the battery lead frame is characterized in that a margin is arranged between the first electrode lug (14) and the first positive coating (11) and between the first electrode lug and the second positive coating (12), and a margin is arranged between the second electrode lug (15) and the second positive coating (12) and between the second positive electrode lug and the third positive coating (13).
6. A lithium ion battery, characterized by: the lithium ion battery positive pole piece comprises the lithium ion battery positive pole piece of any one of claims 1 to 5.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020912727.8U CN212136591U (en) | 2020-05-25 | 2020-05-25 | Lithium ion battery positive pole piece and lithium ion battery |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020912727.8U CN212136591U (en) | 2020-05-25 | 2020-05-25 | Lithium ion battery positive pole piece and lithium ion battery |
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| CN212136591U true CN212136591U (en) | 2020-12-11 |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114005956A (en) * | 2021-12-30 | 2022-02-01 | 天津力神电池股份有限公司 | Battery pole piece, preparation method thereof and lithium ion battery |
| WO2023028815A1 (en) * | 2021-08-31 | 2023-03-09 | 宁德时代新能源科技股份有限公司 | Wound electrode assembly, battery cell, battery and electrical device |
-
2020
- 2020-05-25 CN CN202020912727.8U patent/CN212136591U/en active Active
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2023028815A1 (en) * | 2021-08-31 | 2023-03-09 | 宁德时代新能源科技股份有限公司 | Wound electrode assembly, battery cell, battery and electrical device |
| CN114005956A (en) * | 2021-12-30 | 2022-02-01 | 天津力神电池股份有限公司 | Battery pole piece, preparation method thereof and lithium ion battery |
| CN114005956B (en) * | 2021-12-30 | 2022-05-10 | 天津力神电池股份有限公司 | Battery pole piece, preparation method thereof and lithium ion battery |
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| TR01 | Transfer of patent right |
Effective date of registration: 20210428 Address after: No.350 Jinshanhu Road, Maanshan economic and Technological Development Zone, Anhui Province 243000 Patentee after: Beehive energy technology (Ma'anshan) Co.,Ltd. Address before: Room 2-202, No. 259, Huxinan Road, Ma'anshan Economic and Technological Development Zone, Anhui Province Patentee before: ANHUI TAINENG NEW ENERGY TECHNOLOGY Co.,Ltd. |
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