CN219696675U - Battery core and lithium battery for improving short circuit failure - Google Patents
Battery core and lithium battery for improving short circuit failure Download PDFInfo
- Publication number
- CN219696675U CN219696675U CN202320782618.2U CN202320782618U CN219696675U CN 219696675 U CN219696675 U CN 219696675U CN 202320782618 U CN202320782618 U CN 202320782618U CN 219696675 U CN219696675 U CN 219696675U
- Authority
- CN
- China
- Prior art keywords
- negative electrode
- tab
- short circuit
- negative
- circuit failure
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 15
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 15
- 229910000570 Cupronickel Inorganic materials 0.000 claims abstract description 7
- YOCUPQPZWBBYIX-UHFFFAOYSA-N copper nickel Chemical compound [Ni].[Cu] YOCUPQPZWBBYIX-UHFFFAOYSA-N 0.000 claims abstract description 7
- 238000007747 plating Methods 0.000 claims abstract description 7
- 239000000463 material Substances 0.000 claims abstract description 6
- 239000000853 adhesive Substances 0.000 claims description 8
- 230000001070 adhesive effect Effects 0.000 claims description 8
- 239000003292 glue Substances 0.000 claims description 5
- 230000004927 fusion Effects 0.000 claims description 2
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 abstract description 5
- 229910001416 lithium ion Inorganic materials 0.000 abstract description 5
- 238000010438 heat treatment Methods 0.000 abstract description 2
- PXHVJJICTQNCMI-UHFFFAOYSA-N Nickel Chemical compound [Ni] PXHVJJICTQNCMI-UHFFFAOYSA-N 0.000 description 4
- 238000010586 diagram Methods 0.000 description 4
- 238000003466 welding Methods 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 229910052759 nickel Inorganic materials 0.000 description 2
- 230000008094 contradictory effect Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Classifications
-
- 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
Landscapes
- Connection Of Batteries Or Terminals (AREA)
Abstract
The utility model discloses a battery cell and a lithium battery for improving short circuit failure, which belong to the technical field of lithium batteries, and mainly comprise a pole piece, a diaphragm and a pole lug, wherein the pole piece comprises a positive pole piece and a negative pole piece, the pole lug comprises a positive pole lug and a negative pole lug, and the negative pole lug is connected to the negative pole piece; the negative electrode lugs are provided with at least two, gaps are arranged between the negative electrode lugs, and the negative electrode lugs are made of copper nickel plating materials. According to the utility model, the current is split by arranging the plurality of copper-plated nickel-plated negative electrode lugs, so that the problems of poor current carrying capacity, high heating and easiness in short circuit failure of the conventional narrow and long lithium ion battery are solved.
Description
Technical Field
The utility model relates to the technical field of lithium batteries, in particular to a battery core and a lithium battery for improving short circuit failure.
Background
As electronic devices are increasingly used, the safety performance of lithium ion batteries is increasingly gaining importance. Some types of batteries are narrow and long in size, and thus the tabs of such batteries are also generally thin and narrow, typically representing, for example, blade batteries, subject to application scenarios.
For example, chinese patent document with grant publication number CN217035798U discloses a battery cell structure of a blade battery and a blade battery, including a battery cell unit, the battery cell unit includes: the battery comprises a shell, a first battery cell, a second battery cell, a positive electrode post and a negative electrode post, wherein a first mounting hole and a second mounting hole are formed in one end face of the shell in the thickness direction; the first battery cell and the second battery cell are arranged in the shell side by side in the length direction, and the adjacent ends of the first battery cell and the second battery cell are electrically connected through the positive electrode lug and the negative electrode lug; the positive pole post is connected with the positive pole lug and penetrates out of the first mounting hole, and the negative pole post is connected with the negative pole lug and penetrates out of the second mounting hole. The blade battery cell and the battery solve the problems of uneven current and difficult shell entering of the bare cell.
However, the existing negative electrode tab mostly adopts a nickel tab, so that the current carrying capacity is poor, and under the condition of unchanged size, the condition that the tab is overheated to cause high-temperature short circuit test failure is easy to occur; the current improvement method usually widens and thickens the tab, but the space for adjusting the thickness and width of the tab is limited by the size of the battery, the internal resistance is reduced by about 30%, and the heat generation is not obvious. And as the thickness of the tab increases, the welding gap becomes smaller, and the welding difficulty of the tab becomes larger and larger.
In view of this, improvements to existing cells and lithium batteries are needed.
Disclosure of Invention
Aiming at the defects of the prior art, the utility model provides a battery cell and a lithium battery for improving short circuit failure, which are used for solving the problems of poor current carrying capacity, high heating and easy short circuit failure of the traditional battery cell and lithium battery.
The utility model discloses a battery cell for improving short circuit failure, which comprises a pole piece, a diaphragm and a pole lug, wherein the pole piece comprises a positive pole piece and a negative pole piece, the pole lug comprises a positive pole lug and a negative pole lug, and the negative pole lug is connected to the negative pole piece; the negative electrode lugs are provided with at least two, gaps are arranged between the negative electrode lugs, and the negative electrode lugs are made of copper nickel plating materials.
Preferably, the negative electrode tabs are correspondingly arranged in an overlapping manner along the direction perpendicular to the surface of the negative electrode tab.
Preferably, the negative electrode tab is provided with tab glue.
Preferably, the tab adhesives of adjacent negative electrode tabs are in contact fusion with each other.
Preferably, the negative electrode plate is a strip-shaped long plate, two negative electrode lugs are arranged, one negative electrode lug is arranged at one end of the length direction of the negative electrode plate, and the other negative electrode lug is arranged at the other end of the length direction of the negative electrode plate.
Preferably, the negative electrode plate is a strip-shaped long plate, two negative electrode lugs are arranged, one negative electrode lug is arranged at one end of the length direction of the negative electrode plate, and the other negative electrode lug is arranged at the middle position of the length direction of the negative electrode plate.
Preferably, the pole piece and the diaphragm are stacked in sequence of positive pole piece-diaphragm-negative pole piece-diaphragm-positive pole piece.
Preferably, the pole piece and the diaphragm are sequentially stacked and wound in the order of positive pole piece-diaphragm-negative pole piece-diaphragm-positive pole piece.
Preferably, the tab adhesive is PP adhesive.
The utility model discloses a lithium battery, which comprises any one of the battery cells for improving short circuit failure.
The utility model has the beneficial effects that:
two or more lugs are arranged on the battery core, the lugs are in parallel connection with each other, so that current of the negative electrode can be split, if N negative electrode lugs are arranged on the battery core, the current I on each lug is 1/N of the current I, and the current I is equal to the current I according to the electric power formula P=I of the resistor 2 The heat productivity of the single negative electrode tab is greatly reduced by the X R, and the internal resistance is greatly reduced by adopting the copper nickel plating material for the negative electrode tab, so that the heat productivity of each negative electrode tab is smaller, the battery core and the lithium battery can pass through the short circuit test smoothly, and the stable and efficient power supply effect of the battery core and the lithium battery is maintained when the battery is used, thereby solving the problems of poor current carrying capacity, high heat and easy short circuit failure of the traditional narrow and long lithium ion battery.
Drawings
The accompanying drawings, which are included to provide a further understanding of the utility model and are incorporated in and constitute a part of this specification, illustrate embodiments of the utility model and together with the description serve to explain the utility model and do not constitute a limitation on the utility model. In the drawings:
fig. 1 is a front view of the battery cell of embodiment 1;
fig. 2 is a top view of the battery cell of example 1;
fig. 3 is a schematic diagram of a negative electrode tab and a negative electrode tab in the battery cell of embodiment 1;
fig. 4 is a schematic diagram of a positive electrode tab and a positive electrode tab in the battery cell of embodiment 1;
fig. 5 is a schematic diagram of a negative electrode tab and a negative electrode tab in the battery cell of embodiment 2;
fig. 6 is a schematic diagram of a negative electrode tab and a negative electrode tab in the battery cell of example 3.
Reference numerals illustrate: 1. a pole piece; 11. a positive electrode sheet; 12. a negative electrode plate; 2. a tab; 21. a positive electrode tab; 22. a negative electrode tab; 221. and (5) tab glue.
Detailed Description
Various embodiments of the utility model are disclosed in the following drawings, in which details of the practice are set forth in the following description for the purpose of clarity. However, it should be understood that these practical details are not to be taken as limiting the utility model. That is, in some embodiments of the utility model, these practical details are unnecessary. Moreover, for the sake of simplicity of the drawing, some well-known and conventional structures and elements are shown in the drawings in a simplified schematic manner.
It should be noted that all directional indications such as up, down, left, right, front, and rear … … in the embodiments of the present utility model are merely used to explain the relative positional relationship, movement, etc. between the components in a particular posture such as that shown in the drawings, and if the particular posture is changed, the directional indication is changed accordingly.
In addition, the descriptions of the "first", "second", etc. in this application are for descriptive purposes only and are not intended to specifically indicate a sequential or a cis-position, nor are they intended to limit the utility model, but are merely intended to distinguish between components or operations described in the same technical term, and are not to be construed as indicating or implying a relative importance or implying that the number of technical features indicated is not necessarily limited. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature. In addition, the technical solutions of the embodiments may be combined with each other, but it is necessary to base that the technical solutions can be realized by those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should be considered to be absent and not within the scope of protection claimed in the present utility model.
For a further understanding of the utility model, its features and advantages, reference is now made to the following examples, which are illustrated in the accompanying drawings in which:
example 1
Referring to fig. 1-4, an electrical core for improving short circuit failure disclosed by the utility model comprises a pole piece 1, a diaphragm (not shown in the figure) and a pole lug 2, wherein the pole piece 1 is a strip-shaped long piece and comprises a positive pole piece 11 and a negative pole piece 12, the pole lug 2 comprises a positive pole lug 21 and a negative pole lug 22, the positive pole lug 21 is welded on the positive pole piece 11, the negative pole lug 22 is welded on the negative pole piece 12, and the pole piece 1 and the diaphragm are sequentially stacked in the order of the positive pole piece 11-the diaphragm-the negative pole piece 12-the diaphragm-the positive pole piece 11, or are stacked and wound in the order to form the electrical core. In order to reduce the impedance of the negative electrode tab 22, the negative electrode tab 22 is made of a copper nickel plating material, and compared with the pure nickel tab 2, the copper nickel plating tab 2 can reduce the internal resistance R of the tab 2 by 75%.
Referring to fig. 1 to 4, in order to reduce the current passing through the negative electrode tabs 22, each cell is provided with at least two negative electrode tabs 22, the negative electrode tabs 22 are provided with tab adhesives 221, the tab adhesives 221 are PP adhesives, all the negative electrode tabs 22 are correspondingly arranged in an overlapping manner along the direction perpendicular to the surface of the negative electrode tab 22, namely, are correspondingly arranged in an overlapping manner along the thickness direction parallel to the tab 22, gaps are formed between adjacent negative electrode tabs 22, the tab adhesives 221 on the adjacent negative electrode tabs 22 are mutually contacted, and are mutually fused under the action of pressure and high temperature, so that the gaps between the negative electrode tabs 22 can be supported and maintained, the gaps between the negative electrode tabs 22 are favorable for the rapid and sufficient heat dissipation of the negative electrode tabs 22 during a short circuit test, and the welding space is reserved.
Example 2
Referring to fig. 5, the present embodiment differs from embodiment 1 in that two negative electrode tabs 22 are provided, and one of the negative electrode tabs 22 is provided at one end in the length direction of the negative electrode tab 12, and the other negative electrode tab 22 is provided at the other end in the length direction of the negative electrode tab 12.
Example 3
Referring to fig. 6, the present embodiment is different from embodiment 1 in that two negative electrode tabs 22 are provided, one of the negative electrode tabs 22 is provided at one end in the length direction of the negative electrode tab 12, and the other negative electrode tab 22 is provided at an intermediate position in the length direction of the negative electrode tab 12.
Example 4
The embodiment discloses a lithium ion battery, which comprises any one of the battery cores in the embodiments 1-3.
The implementation principle and the beneficial effects of the utility model are as follows: two or more negative electrode lugs 22 are arranged on the battery core, and the negative electrode lugs 22 are in parallel connection, so that the current of the negative electrode can be splitIf N negative electrode tabs 22 are arranged on the battery cell, the current I on each tab 2 is 1/N of the original current I, and the current I is calculated according to the electric power formula p=i of the resistor 2 The heat productivity of the single negative electrode tab 22 is greatly reduced by the X R, and the internal resistance is greatly reduced by adopting the copper nickel plating material for the negative electrode tab 22, so that the heat productivity of each negative electrode tab 22 is smaller, the battery core and the lithium battery can pass through the short circuit test smoothly, and the stable and efficient power supply effect of the battery core and the lithium battery is maintained when the battery is used, thereby solving the problems of poor current carrying capacity, high heat productivity and easy short circuit failure of the traditional narrow and long lithium ion battery.
The above are merely embodiments of the present utility model, and are not intended to limit the present utility model. Various modifications and variations of the present utility model will be apparent to those skilled in the art. Any modification, equivalent replacement, improvement, or the like, which is within the spirit and principles of the present utility model, should be included in the scope of the claims of the present utility model.
Claims (9)
1. The battery cell is characterized by comprising a pole piece (1), a diaphragm and a pole lug (2), wherein the pole piece (1) comprises a positive pole piece (11) and a negative pole piece (12), the pole lug (2) comprises a positive pole lug (21) and a negative pole lug (22), and the negative pole lug (22) is connected to the negative pole piece (12);
at least two negative electrode lugs (22) are arranged, gaps are arranged between the negative electrode lugs (22), and the negative electrode lugs (22) are made of copper nickel plating materials;
the negative electrode lugs (22) are correspondingly arranged in an overlapping mode along the direction perpendicular to the surfaces of the negative electrode lugs (22).
2. The cell for improving short circuit failure according to claim 1, wherein a tab glue (221) is provided on the negative tab (22).
3. The cell for improving short circuit failure according to claim 2, wherein the tab adhesives (221) of adjacent negative electrode tabs (22) are in contact fusion with each other.
4. The cell for improving short circuit failure according to claim 1, wherein the negative electrode tab (12) is a strip-shaped long sheet, two negative electrode tabs (22) are provided, one of the negative electrode tabs (22) is provided at one end of the negative electrode tab (12) in the length direction, and the other negative electrode tab (22) is provided at the other end of the negative electrode tab (12) in the length direction.
5. The battery cell for improving short circuit failure according to claim 1, wherein the negative electrode tab (12) is a strip-shaped long sheet, two negative electrode tabs (22) are provided, one of the negative electrode tabs (22) is disposed at one end of the negative electrode tab (12) in the length direction, and the other negative electrode tab (22) is disposed at an intermediate position of the negative electrode tab (12) in the length direction.
6. The cell for improving short circuit failure according to any one of claims 1 to 5, wherein the electrode sheet (1) and the separator are stacked in this order of the positive electrode sheet (11), the separator, the negative electrode sheet (12), the separator and the positive electrode sheet (11).
7. The cell for improving short circuit failure according to any one of claims 1 to 5, wherein the electrode sheet (1) and the separator are sequentially stacked and wound in the order of the positive electrode sheet (11), the separator, the negative electrode sheet (12), the separator and the positive electrode sheet (11).
8. A cell for improving short circuit failure according to claim 2 or 3, characterized in that the tab glue (221) is PP glue.
9. A lithium battery comprising a cell according to any one of claims 1-8 that ameliorates short circuit failure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320782618.2U CN219696675U (en) | 2023-04-10 | 2023-04-10 | Battery core and lithium battery for improving short circuit failure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202320782618.2U CN219696675U (en) | 2023-04-10 | 2023-04-10 | Battery core and lithium battery for improving short circuit failure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN219696675U true CN219696675U (en) | 2023-09-15 |
Family
ID=87966258
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202320782618.2U Active CN219696675U (en) | 2023-04-10 | 2023-04-10 | Battery core and lithium battery for improving short circuit failure |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN219696675U (en) |
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2023
- 2023-04-10 CN CN202320782618.2U patent/CN219696675U/en active Active
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |