CN218997021U - Electrode lug structure for overcurrent automatic disconnection protection and lithium ion battery - Google Patents
Electrode lug structure for overcurrent automatic disconnection protection and lithium ion battery Download PDFInfo
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- CN218997021U CN218997021U CN202222792137.8U CN202222792137U CN218997021U CN 218997021 U CN218997021 U CN 218997021U CN 202222792137 U CN202222792137 U CN 202222792137U CN 218997021 U CN218997021 U CN 218997021U
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- automatic disconnection
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model belongs to the technical field of battery production and manufacturing, and in particular relates to a tab structure for overcurrent automatic disconnection protection and a lithium ion battery, comprising a tab main body and a protector arranged on the tab main body; the tab body comprises a welding piece and an exposed piece; the protector comprises a first external arm, a second external arm and a protection component, wherein the first external arm is connected to the welding piece, one end of the second external arm is connected to the exposed piece, the other end of the second external arm is abutted to the first external arm, and the protection component is located between the first external arm and the second external arm and used for bouncing off the second external arm so as to disconnect the electric connection between the first external arm and the second external arm. According to the utility model, the protector and the tab are combined together in advance by optimizing the tab structure, so that the safety of the battery is improved.
Description
Technical Field
The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a tab structure for overcurrent automatic disconnection protection and a lithium ion battery.
Background
Nowadays, lithium ion batteries are widely applied to the fields of electronic equipment, power automobiles and the like due to the advantages of light weight, high specific power, high voltage platform, small self-discharge, long cycle life, small environmental pollution, no memory effect, good safety and the like. With the continuous expansion of the application field, the requirements of people on lithium ion batteries are also continuously tightened, such as energy density, charging time, multiplying power discharging capability and the like, which also lead to the increasingly strict safety requirements of the lithium ion batteries.
The existing protection structure is welded in the battery manufacturing process, so that the battery is easy to discard, the production cost is increased, the battery is easy to fall off in the use process, and the safety is low.
Disclosure of Invention
One of the objects of the present utility model is: aiming at the defects of the prior art, the tab structure for overcurrent automatic disconnection protection is provided, and the protector and the tab are combined together in advance by optimizing the tab structure, so that the safety of a battery is improved.
In order to achieve the above purpose, the present utility model adopts the following technical scheme:
the utility model provides an overcurrent automatic disconnection protection's utmost point ear structure, includes utmost point ear main part and installs in the protection ware of utmost point ear main part; the tab body comprises a welding piece and an exposed piece; the protector comprises a first external arm, a second external arm and a protection component, wherein the first external arm is connected to the welding piece, one end of the second external arm is connected to the exposed piece, the other end of the second external arm is abutted to the first external arm, and the protection component is located between the first external arm and the second external arm and used for bouncing off the second external arm so as to disconnect the electric connection between the first external arm and the second external arm.
Preferably, the welding piece further comprises tab glue, the tab glue coats the surface of the welding piece, and the tab glue is polyethylene or polypropylene.
Preferably, the first external arm is welded to the welding piece, and the second external arm is welded to the exposed piece and is formed with a welding point.
Preferably, the working temperature of the protection component is 50-150 ℃.
Preferably, the first external arm and the second external arm are both copper nickel plated sheets, nickel sheets or aluminum sheets.
Preferably, the protection assembly comprises a thermistor and a bimetallic strip, wherein the thermistor is arranged above the first external connecting arm, and the bimetallic strip is arranged above the thermistor.
Preferably, the thermistor and the bimetallic strip are enclosed by the protective shell, the first external connecting arm is at least partially embedded in the protective shell, and one end of the second external connecting arm is positioned in the protective shell.
Preferably, a metal contact point is disposed at one end of the second external arm abutting against the first external arm.
Preferably, the thermistor has a sheet-like structure, and the bimetal has an arc-like structure.
The second objective of the present utility model is to provide a lithium ion battery, which includes the above tab structure for overcurrent automatic disconnection protection.
The utility model has the beneficial effects that the protector and the lug main body are directly combined, namely, the protector is welded in the production process of the lug, the whole battery is prevented from being scrapped due to the welding failure of the protector, the production cost of the battery is reduced, meanwhile, the lug main body and the protector are welded together in advance, the problem of falling failure caused by deformation of the protector can be avoided, wherein the protection component is provided with the thermistor and the bimetallic strip, when the battery generates overlarge current or high temperature, the resistance value of the thermistor is increased, the temperature is increased, the bimetallic strip deforms due to heat expansion and cold contraction in the contact process of the bimetallic strip and the thermistor, so that the other end of the second external arm is sprung open, the electric connection between the first external arm and the second external arm is disconnected, the explosion of the battery is avoided, and the safety of the battery is improved. According to the utility model, the protector and the tab are combined together in advance by optimizing the tab structure, so that the safety of the battery is improved.
Drawings
Features, advantages, and technical effects of exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of the present utility model.
Fig. 2 is a schematic view of the protector of the present utility model in normal operation.
Fig. 3 is a schematic diagram of an embodiment of the present utility model in a disconnected state.
Fig. 4 is a schematic structural diagram of the present utility model mounted on a battery cell.
Wherein reference numerals are as follows:
1-a tab body; 11-welding parts; 12-an exposed piece;
2-protector; 21-a first external arm; 22-a second outer arm; 23-a protection component; 231-a thermistor; 232-a bimetallic strip;
3-tab glue;
4-welding spots;
5-a protective housing;
6-metal contact points.
Detailed Description
Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art can solve the technical problem within a certain error range, substantially achieving the technical effect.
Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.
The present utility model will be described in further detail with reference to fig. 1 to 4, but the present utility model is not limited thereto.
Embodiment one
Embodiment one will be described with reference to FIG. 1
The tab structure for overcurrent automatic disconnection protection comprises a tab main body 1 and a protector 2 arranged on the tab main body 1; the tab body 1 includes a welding member 11 and an exposed member 12; the protector 2 comprises a first external arm 21, a second external arm 22 and a protection component 23, wherein the first external arm 21 is connected to the welding piece 11, one end of the second external arm 22 is connected to the exposed piece 12, the other end of the second external arm 22 is abutted to the first external arm 21, and the protection component 23 is located between the first external arm 21 and the second external arm 22 and is used for bouncing off the second external arm 22 so as to disconnect the electrical connection between the first external arm 21 and the second external arm 22.
Because the existing protection structure welds in the battery manufacturing process, easily lead to the battery to scrap, increase manufacturing cost, and take place to drop easily in battery use, the security is lower, consequently, with protector 2 and utmost point ear main part 1 direct bond, accomplish welding protector 2 promptly in utmost point ear production process, avoid leading to whole battery to scrap because protector 2 welding failure, help reducing the manufacturing cost of battery, simultaneously, utmost point ear main part 1 and protector 2 weld together in advance, can avoid the problem that the protector 2 takes place to warp the inefficacy that drops that leads to, wherein, protection component 23 has thermistor 231 and bimetallic strip 232, when the battery takes place the electric current too big or take place high temperature, thermistor 231's resistance increases and the temperature rises, bimetallic strip 232 takes place thermal expansion shrinkage and deformation in the contact process with thermistor 231, thereby the other end bullet of second external arm 22 is opened, realize breaking the electric connection between first external arm 21 and the second external arm 22, protector 2 is in the disconnected state, avoid the battery to take place the explosion, help improving the security of battery.
In this embodiment, the first external arm 21 and the second external arm 22 are both metal conductors, the welding member 11 is connected with the battery core body, in some embodiments, the welding member 11 may also be an outlet end of the battery core tab, and the material of the welding member 11 may be the same as or different from that of the pole piece current collector, in addition, during normal operation, the other end of the second external arm 22 abuts against the first external arm 21, that is, the protector 2 is in a closed state, the welding member 11 and the exposed member 12 are conducted, and the battery can be charged and discharged normally.
The tab structure for overcurrent automatic disconnection protection further comprises tab glue 3, wherein the tab glue 3 coats the surface of the welding piece 11, and the tab glue 3 is polyethylene or polypropylene or a mixture of the two. Specifically, the tab adhesive 3 covers a part of the surface of the welding member 11 by high-temperature heating and bonding, and may be understood as being sleeved on the welding member 11 in a ring-like structure.
In the tab structure for overcurrent automatic disconnection protection according to the present utility model, the first external arm 21 is welded to the welding member 11, the second external arm 22 is welded to the exposed member 12, so as to help reduce the probability of falling off during use, and form the welding spots 4, the number of the welding spots 4 is plural, and can be adjusted according to the size and structure of an actual battery, in this embodiment, the number of the welding spots 4 is four, and two welding spots 4 are arranged at intervals along the length direction of the tab.
In the tab structure of the overcurrent automatic disconnection protection according to the present utility model, the protection assembly 23 includes a thermistor 231 and a bimetal 232, the thermistor 231 is mounted above the first external connection arm 21, and the bimetal 232 is mounted above the thermistor 231. In this embodiment, the thermistor 231 is a PTC thermistor, the bimetal 232 is formed of two metals, and the two metals expand after being heated, so that the bimetal 232 is deformed as a whole, when the battery is at a high temperature or has a large current, the resistance and the temperature of the thermistor 231 are increased accordingly, the bimetal 232 expands and contracts with heat in the process of contacting with the thermistor 231, so that the other end of the second external arm 22 is sprung out, the electrical connection between the first external arm 21 and the second external arm 22 is disconnected, i.e. the protector 2 is in a disconnected state, explosion of the battery is avoided, and the safety of the battery is improved.
In the tab structure of the overcurrent automatic disconnection protection according to the utility model, the protection device further comprises a protection shell 5, the protection shell 5 surrounds the thermistor 231 and the bimetallic strip 232, the first external connection arm 21 is at least partially embedded in the protection shell 5, and one end of the second external connection arm 22 is positioned inside the protection shell 5. In this embodiment, the protection housing 5 serves to accommodate the thermistor 231 and the bimetal 232, so as to avoid displacement or shake of the thermistor 231 and the bimetal 232, the first external arm 21 is at least partially embedded in the protection housing 5, so as to fix the position of the first external arm 21, and the second external arm 22 acts under the action of the thermistor 231 and the bimetal 232, so as to realize closing and opening of the protector 2. Wherein, the material of the protective housing 5 is resin.
The working principle of the utility model is as follows:
the protector 2 and the tab main body 1 are directly combined, namely, the protector 2 is welded in the tab production process, the whole battery is prevented from being scrapped due to the welding failure of the protector 2, the production cost of the battery is reduced, meanwhile, the tab main body 1 and the protector 2 are welded together in advance, the problem of falling failure caused by deformation of the protector can be avoided, the protection component 23 is provided with the thermistor 231 and the bimetallic strip 232, when the battery is excessively large in current or high in temperature, the resistance value of the thermistor 231 is increased, the temperature is increased, the bimetallic strip 232 deforms due to heat expansion and cold contraction in the contact process with the thermistor 231, the other end of the second external arm 22 is sprung open, the electric connection between the first external arm 21 and the second external arm 22 is disconnected, namely, the protector 2 is in an off state, explosion of the battery is avoided, and the safety of the battery is improved.
Second embodiment
Unlike the first embodiment, the following is: the operating temperature of the protector 2 of the present embodiment is 50 to 150 ℃, and is not limited thereto, and the first external arm 21 and the second external arm 22 are made of a conductive material such as a copper nickel plated sheet, a nickel sheet or an aluminum sheet.
Other structures are the same as those of the first embodiment, and will not be described here again.
Embodiment III
Unlike the first embodiment, the following is: the second external arm 22 of the present embodiment is disposed at one end of the first external arm 21, where the metal contact point 6 is preferably a silver contact, which is helpful for increasing the contact stability between the first external arm 21 and the second external arm 22, the thermistor 231 is of a sheet-shaped structure, the bimetal 232 is of an arc-shaped structure, specifically, during normal use, the bimetal 232 is of a concave-like arc structure, and during high current or high temperature of the battery, the bimetal 232 is of a convex arc structure.
Other structures are the same as those of the first embodiment, and will not be described here again.
Lithium ion battery
The utility model comprises the tab structure of the overcurrent automatic disconnection protection in the first to third embodiments.
Specifically, the battery cell comprises a battery cell, wherein the battery cell can comprise at least two pole pieces which are mutually overlapped and have opposite polarities, and the pole pieces with opposite polarities respectively form a positive pole piece of the battery and a negative pole piece of the battery. In order to avoid short circuit between the positive pole piece and the negative pole piece, a diaphragm is arranged between every two adjacent pole pieces, and pole pieces with opposite polarities are electrically isolated through the diaphragm.
The at least two pole pieces may include a first pole piece and a second pole piece, the polarities of the first pole piece and the second pole piece are opposite, and the first pole piece and the second pole piece are stacked with each other.
Specifically, the first pole piece may be an anode pole piece, and the second pole piece may be a cathode pole piece; alternatively, the first pole piece may be a negative pole piece and the second pole piece may be a positive pole piece, without limitation.
In some examples, the cells may be coiled cells. The first pole piece, the diaphragm and the second pole piece which are sequentially overlapped are wound around the winding center, and a winding structure is formed.
In other examples, the cells may be laminated cells. The first pole pieces are multiple, the second pole pieces are multiple, the first pole pieces and the second pole pieces are sequentially staggered and stacked along the same direction, and a diaphragm is arranged between each two adjacent first pole pieces and second pole pieces, so that the first pole pieces and the second pole pieces are electrically insulated.
Variations and modifications of the above embodiments will occur to those skilled in the art to which the utility model pertains from the foregoing disclosure and teachings. Therefore, the present utility model is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.
Claims (9)
1. The tab structure for overcurrent automatic disconnection protection is characterized by comprising a tab main body (1) and a protector (2) arranged on the tab main body (1);
the tab body (1) comprises a welding piece (11) and an exposed piece (12);
the protector (2) comprises a first external arm (21), a second external arm (22) and a protection component (23), wherein the first external arm (21) is connected to the welding piece (11), one end of the second external arm (22) is connected to the exposed piece (12), the other end of the second external arm (22) is abutted to the first external arm (21), and the protection component (23) is located between the first external arm (21) and the second external arm (22) and used for bouncing off the second external arm (22) so as to disconnect the electric connection between the first external arm (21) and the second external arm (22).
2. The tab structure for overcurrent automatic disconnection protection of claim 1, wherein: the novel solar cell is characterized by further comprising a tab glue (3), wherein the tab glue (3) coats the surface of the welding piece (11), and the tab glue (3) is polyethylene or polypropylene.
3. The tab structure for overcurrent automatic disconnection protection of claim 1, wherein: the first external arm (21) is welded to the welding piece (11), and the second external arm (22) is welded to the exposed piece (12) and is provided with a welding point (4).
4. The tab structure for overcurrent automatic disconnection protection of claim 1, wherein: the first external connecting arm (21) and the second external connecting arm (22) are copper nickel plating sheets, nickel sheets or aluminum sheets.
5. The tab structure for overcurrent automatic disconnection protection of claim 1, wherein: the protection assembly (23) comprises a thermistor (231) and a bimetallic strip (232), wherein the thermistor (231) is arranged above the first external connection arm (21), and the bimetallic strip (232) is arranged above the thermistor (231).
6. The tab structure of an overcurrent automatic disconnection protection as defined in claim 5, wherein: the thermistor is characterized by further comprising a protective shell (5), wherein the protective shell (5) surrounds the thermistor (231) and the bimetallic strip (232), the first external connecting arm (21) is at least partially embedded in the protective shell (5), and one end of the second external connecting arm (22) is located inside the protective shell (5).
7. The tab structure of an overcurrent automatic disconnection protection as defined in claim 5, wherein: and one end of the second external arm (22) abutting against the first external arm (21) is provided with a metal contact point (6).
8. The tab structure of an overcurrent automatic disconnection protection as defined in claim 5, wherein: the thermistor (231) is of a sheet-shaped structure, and the bimetallic strip (232) is of an arc-shaped structure.
9. A lithium ion battery, characterized in that: a tab construction comprising the overcurrent automatic disconnection protection of any one of claims 1-8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222792137.8U CN218997021U (en) | 2022-10-24 | 2022-10-24 | Electrode lug structure for overcurrent automatic disconnection protection and lithium ion battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202222792137.8U CN218997021U (en) | 2022-10-24 | 2022-10-24 | Electrode lug structure for overcurrent automatic disconnection protection and lithium ion battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN218997021U true CN218997021U (en) | 2023-05-09 |
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ID=86195833
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202222792137.8U Active CN218997021U (en) | 2022-10-24 | 2022-10-24 | Electrode lug structure for overcurrent automatic disconnection protection and lithium ion battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN218997021U (en) |
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2022
- 2022-10-24 CN CN202222792137.8U patent/CN218997021U/en active Active
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