Tab, battery cell and battery
By using a PTC material protective layer at the tab connection, the safety hazards of soft-pack cells during overcharging or external short circuits are solved, achieving self-protection of the cells, avoiding bulging and explosion, and reducing battery manufacturing costs.
Patent Information
- Application Number
- CN202423149833.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-20
- Publication Date
- 2025-12-19
- Estimated Expiration
- 2034-12-20
AI Technical Summary
Existing pouch cells are prone to overheating under overcharging or external short circuit conditions, leading to safety issues such as bulging, fire, and explosion. Current technology cannot prevent these problems from occurring in the cells themselves.
The device employs a tab design, comprising a first tab body and a second tab body. A protective layer made of PTC material with a thickness of 5–30 μm is connected between the two parts to block current during overcharging or external short circuits, thus preventing safety accidents.
It effectively blocks current, avoiding safety issues such as cell bulging, fire, and explosion, and saves on the cost of dual IC design at the PCM end.
Smart Images
Figure CN223693329U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to battery technology field especially relates to a tab, electric core and battery. BACKGROUND
[0002] The existing soft package electric core, when overcharge, external short circuit and so on, will lead to the temperature rise of electric core inside, and further causes the safety problems such as bulging, fire explosion.
[0003] At present, the measure to solve the problem is generally through the mode of external PCM (electric core protection plate) overcharge, external short circuit protection. This can not avoid overcharge, external short circuit and so on from electric core itself. UTILITY MODEL CONTENT
[0004] To solve the above technical problem, the utility model provides a tab, electric core and battery, avoid the safety problems such as electric core bulging, fire explosion under the condition of electric core overcharge, external short circuit and so on.
[0005] The utility model solves technical scheme that its technical problem adopts:
[0006] A battery tab, including first tab main part and second tab main body, the first tab main body and the second tab main body are equipped with the connecting portion, and the connecting portion between the first tab main body and the second tab main body is connected through the protection layer, the material quality of the protection layer is PTC material, the thickness of the protection layer is T1, and the value range of T1 is 5 ~ 30 mu m.
[0007] Preferably, the connecting portion of the first tab main body and the second tab main body is wrapped with a reinforcing structure.
[0008] Preferably, the reinforcing structure includes two tab rubbers, the two tab rubbers are attached, and the connecting portion of the first tab main body and the second tab main body is wrapped therein.
[0009] Preferably, the material quality of the tab rubber is PP;
[0010] The tab rubber is L-shaped, including the first attachment and the second attachment of different thickness, wherein the second attachment of one of the tab rubbers is attached to the first tab main body, and the second attachment of the other tab rubber is attached to the second tab main body, and the protection layer is located between the two first attachments;
[0011] The thickness T2 of the first attachment is 140 ~ 420 mu m, and the thickness T3 of the second attachment is 55 ~ 90 mu m.
[0012] Preferably, the first tab main body and the second tab main body are the same kind of metal.
[0013] Preferably, the material of the first tab body and the second tab body is nickel or aluminum.
[0014] Preferably, the thickness of the first tab body and the second tab body is the same.
[0015] Or the thickness of the first tab body and the second tab body is different, and the thickness difference is less than or equal to 0.05mm.
[0016] An electric core comprising a positive electrode sheet, a negative electrode sheet and a separator, the separator being arranged between the positive electrode sheet and the negative electrode sheet.
[0017] Further comprising a positive electrode tab and a negative electrode tab, the positive electrode tab being connected to the positive electrode sheet, and the negative electrode tab being connected to the negative electrode sheet.
[0018] The positive electrode tab and / or the negative electrode tab is the tab described above.
[0019] Preferably, the material of the positive electrode tab is aluminum, and the material of the negative electrode tab is nickel.
[0020] A battery comprising the electric core described above.
[0021] The utility model discloses the beneficial effect lies in:
[0022] By setting the tab into the first tab body and the second tab body, and setting the protective layer to connect the connecting part of the first tab body and the second tab body, and the material of the protective layer is PTC material, the thickness of the protective layer is 5-30um, when the electric core overcharges or external short circuit, the temperature of the electric core tab rises, the resistance of the protective layer of PTC material will increase rapidly, and the role of blocking current is played, thereby avoiding overcharge or external short circuit continues to occur, and the safety problems such as electric core bulging, fire explosion are avoided. BRIEF DESCRIPTION OF DRAWINGS
[0023] Figure 1 It is the structural schematic diagram of the electric core of the utility model.
[0024] Figure 2 It is the structural schematic diagram of the tab of the utility model.
[0025] Figure 3 It is the local schematic view of the tab of the utility model.
[0026] Wherein: 1-first tab body, 2-second tab body, 100-connecting part, 3-protective layer, 4-tab rubber, 41-first lamination part, 42-second lamination part;
[0027] 10 - battery cell, 101 - positive electrode tab, 102 - negative electrode tab, 103 - positive electrode lug, 104 - negative electrode lug. DETAILED DESCRIPTION
[0028] In the description of the utility model, it needs to explain, unless another explicit stipulation and limit, the term "installation", "link", "connection" should do broad sense understanding, for example, can be fixed connection, also can be detachable connection, or integrally connected, can be mechanical connection, also can be electrical connection, can be direct connection, also can be indirectly connected through the intermediate medium, can be two element inside the intercommunication. For ordinary skilled person in the art, the above-mentioned term can be understood in the specific meaning in the utility model according to specific circumstances.
[0029] The specific embodiments of the utility model are further described in detail below in combination with the drawings and examples. The following examples are used to illustrate the utility model, but not to limit the scope of the utility model.
[0030] As Figures 1-3 As shown in the utility model preferred embodiment, a kind of battery cell 10, including positive electrode tab 101, negative electrode tab 102 and diaphragm, the diaphragm is arranged between the positive electrode tab 101 and the negative electrode tab 102. It also includes positive electrode lug 103 and negative electrode lug 104, the positive electrode lug 103 is connected the positive electrode tab 101, the negative electrode lug 104 is connected the negative electrode tab 102. The positive electrode lug and negative electrode lug can be the safety lug of the application, it can also be one kind of safety lug of the application, and the other is ordinary lug.
[0031] The safety lug of the application includes first lug body 1 and second lug body 2, the first lug body 1 and the second lug body 2 are equipped with connecting portion 100, and the connecting portion 100 between the first lug body 1 and the second lug body 2 is connected by protective layer 3. The material of the protective layer 3 is PTC (positive temperature coefficient) material, the thickness of the protective layer 3 is T1, the value range of T1 is 5-30 μm, such as 6 μm, 8 μm, 10 μm, 12 μm, 14 μm, 16 μm, 18 μm, 20 μm, 22 μm, 24 μm, 26 μm, 28 μm, etc., or any value or any range between any two of the above. The length L1 of the protective layer 3 is 2-6 mm, such as 3 mm, 3.5 mm, 4 mm, 5.5 mm, 5 mm, 5.5 mm, etc., or any value or any range between any two of the above.
[0032] The thickness of the protective layer 3 is set to 5-30 μm, because if the protective layer 3 is too thin, less than 5 um, it is not conducive to block the large current conduction and thus cannot prevent temperature rise; and if the thickness of the protective layer 3 exceeds 30 um, the coating is too thick, which leads to the risk of affecting the reliability of the top seal packaging.
[0033] Based on the above technical features, by setting the tab to the first tab body 1 and the second tab body 2, and setting the protective layer 3 to connect the connecting part 100 of the first tab body 1 and the second tab body 2, and the material of the protective layer 3 is PTC material, and the thickness of the protective layer 3 is 5-30 μm, when the battery cell 10 is overcharged or externally short-circuited, the temperature of the tab of the battery cell 10 rises, the resistance of the PTC material protective layer 3 rapidly increases, which plays a role in blocking the current, thereby avoiding overcharging or external short-circuiting, and avoiding the safety problems such as battery cell bulging, fire explosion, etc.
[0034] Specifically, when the temperature of the tab is within the non-limiting temperature range (<100℃), the current can normally pass through the first tab body 1 and flow through the second tab body 2 via the protective layer 3; when the temperature of the tab exceeds the non-limiting temperature range (≥100℃), the resistance of the protective layer 3 will increase sharply, blocking the current from flowing from the first tab body 1 to the second tab body 2 via the protective layer 3, thereby playing a role in blocking the current and protecting the battery cell, and avoiding the situation of fire explosion of the battery cell 10.
[0035] In addition, by using the tab of the present application, the PCM end can avoid using a double IC (two control chips) design, saving battery manufacturing costs.
[0036] In the present embodiment, the protective layer 3 has adhesion, and its two surfaces can be connected to the connecting part 100, respectively, having good strength. However, to further improve the strength of the tab itself, a reinforcing structure can also be wrapped on the connecting part 100 of the first tab body 1 and the second tab body 2. For example, two pieces of tab adhesive 4 are used, the two pieces of tab adhesive 4 are attached to each other, and the connecting part 100 of the first tab body 1 and the second tab body 2 is wrapped therebetween. The material of the tab adhesive 4 can be PP, and the tab adhesive 4 is L-shaped, including a first attachment part 41 and a second attachment part 42 with different thicknesses. The first attachment part 41 of one piece of the tab adhesive 4 corresponds to the second attachment part 42 of the other piece of the tab adhesive 4, i.e. the second attachment part 42 of one piece of the tab adhesive 4 is attached to the first tab body 1, and the second attachment part 42 of the other piece of the tab adhesive 4 is attached to the second tab body 2. The protective layer 3 is located between the two first attachment parts, and the two ends of the protective layer 3 respectively abut the inner walls of the two first attachment parts 41.
[0037] The thickness T2 of the first bonding part 41 is 140-420 μm, such as 150 μm, 180 μm, 200 μm, 250 μm, 300 μm, 350 μm, 400 μm, 410 μm, etc. The thickness T3 of the second bonding part 42 is 55-90 μm, such as 56 μm, 58 μm, 60 μm, 62 μm, 64 μm, 66 μm, 68 μm, 70 μm, 76 μm, 78 μm, 80 μm, 88 μm, etc., or any value or range between any two of the above values. The total thickness T4 of the two tab rubbers 4 after bonding is 275-750 μm.
[0038] In addition, the length L2 of the tab rubber 4 is 4-8 mm, such as 5 mm, 5.5 mm, 6 mm, 6.5 mm, 7 mm, 7.5 mm, etc., and the spacing L3 between one end of the tab rubber 4 and the protective layer 3 is 0.8-1.2 mm, such as 0.9 mm, 1 mm, 1.1 mm, etc., to ensure that the tab rubber 4 completely wraps the connecting part 100.
[0039] As shown in FIG. 4, after the positive electrode tab 101, the negative electrode tab 102, and the separator are wound, the tab rubber 4 can be partially exposed at the end of the battery cell, and can also serve as an insulator. Figure 1
[0040] In this embodiment, since the first tab body 1 and the second tab body 2 constitute the same tab, the first tab body 1 and the second tab body 2 are preferably the same metal, such as aluminum or nickel. When the first tab body 1 and the second tab body 2 are both aluminum, they constitute the positive tab 103; when the first tab body 1 and the second tab body 2 are both nickel, they constitute the negative tab 104. Of course, the negative tab 104 can also be made of copper.
[0041] In this embodiment, the thickness of the first tab body 1 and the second tab body 2 can be the same or different, but preferably the same to ensure that the first tab body 1 and the second tab body 2 have the same performance. The thickness of the first tab body 1 and the second tab body 2 is T2, and T2 has a value range of 0.08-0.3 mm, such as 0.1 mm, 0.12 mm, 0.14 mm, 0.16 mm, 0.18 mm, 0.2 mm, 0.22 mm, 0.24 mm, 0.26 mm, 0.28 mm, etc., or any value or range between any two of the above values.
[0042] If the thickness of the first tab body 1 and the second tab body 2 is different, the thickness difference needs to be less than or equal to 0.05 mm.
[0043] To solve the above technical problems, the application further provides a battery, comprising a shell, the above-mentioned battery cell 10 and a cap, the material of the shell is stainless steel, preferably nickel-plated stainless steel, the shell has an opening; the battery cell 10 is arranged in the shell through the opening, the positive electrode tab 103 is connected with a positive electrode current collector disc. The negative electrode tab 104 is connected with a negative electrode current collector disc, and the negative electrode current collector disc is connected with the bottom wall of the shell; or the negative electrode tab 104 is directly connected with the bottom wall of the shell. The cap is connected with the shell to cover the opening, and the positive electrode current collector disc is connected with the cap.
[0044] The battery of the application can effectively avoid the safety problems such as bulging, fire and explosion of the battery cell 10 caused by overcharging, external short circuit and the like of the battery cell 10.
[0045] The above-mentioned is only the preferred embodiment of the application, and it should be pointed out that, for the ordinary skilled in the art, without departing from the technical principles of the application, a number of improvements and substitutions can be made, and these improvements and substitutions should also be regarded as the protection range of the application.
Claims
1. A battery tab, characterized by: The first tab body and the second tab body are provided with connecting portions, and the connecting portions of the first tab body and the second tab body are connected by a protective layer, the material of the protective layer is PTC material, the thickness of the protective layer is T1, and the value range of T1 is 5-30 μm.
2. The battery tab of claim 1, wherein: The connecting portions of the first tab body and the second tab body are wrapped with a reinforcing structure.
3. The battery tab of claim 2, wherein: The reinforcing structure includes two pieces of tab adhesive, the two pieces of tab adhesive are attached to each other, and the connecting portions of the first tab body and the second tab body are wrapped therein.
4. The battery tab of claim 3, wherein: The material of the tab adhesive is PP. The tab adhesive is L-shaped, including a first attachment portion and a second attachment portion with different thicknesses, the second attachment portion of one piece of the tab adhesive is attached to the first tab body, the second attachment portion of the other piece of the tab adhesive is attached to the second tab body, and the protective layer is located between the two first attachment portions. The thickness T2 of the first attachment portion is 140-420 μm, and the thickness T3 of the second attachment portion is 55-90 μm.
5. The battery tab of claim 2, wherein: The first tab body and the second tab body are made of the same metal.
6. The battery tab of claim 5, wherein: The material of the first tab body and the second tab body is nickel or aluminum.
7. The battery tab of any one of claims 1-6, wherein: The thicknesses of the first tab body and the second tab body are the same. Or the thicknesses of the first tab body and the second tab body are different, and the thickness difference is less than or equal to 0.05 mm.
8. An electric cell characterized by: The battery cell includes a positive electrode tab, a negative electrode tab, and a separator, and the separator is arranged between the positive electrode tab and the negative electrode tab. The battery cell further includes a positive electrode tab and a negative electrode tab, the positive electrode tab is connected to the positive electrode tab, and the negative electrode tab is connected to the negative electrode tab. The positive electrode tab and / or the negative electrode tab is the tab as claimed in any one of claims 1-7.
9. The cell of claim 8, wherein: The material of the positive electrode tab is aluminum, and the material of the negative electrode tab is nickel.
10. A battery, characterized by The battery cell includes the battery cell as claimed in any one of claims 8-9.