Safe tab and battery
By designing a viscous heat release structure with poor thickness on the ears of the soft-pack battery, the problem of the battery prone to explosion during thermal shock is solved, and higher safety and heat dissipation efficiency are achieved.
Patent Information
- Application Number
- CN202420313365.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-20
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-02-20
AI Technical Summary
Existing soft-pack batteries are prone to bloating and bloating during tests such as thermal shock and high-temperature storage, and the heat dissipation ability of the extreme ears is weak, which makes it easy to cause explosion accidents when heat is out of control.
A safety ear is designed, which includes an ear body and a viscous heat release structure arranged on the ear body. The viscous heat release structure consists of a first and a second portion connected, with the two portions having a thickness difference to improve the heat dissipation ability and safety of the extreme ears.
The thickness of the viscous heat release part on both sides of the front and back of the pole ear is inconsistent, ensuring that energy can be released in time when the heat is out of control, avoiding the battery explosion, and significantly improving the safety of the pole ear and the battery.
Smart Images
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Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of batteries, and in particular relates to a safety tab and a battery. Background Art
[0002] In the existing battery production, soft-pack batteries often swell and bloat during safety tests such as thermal shock and high-temperature storage, as well as in the later stages of their life cycle such as normal temperature cycling and high-temperature cycling. At the same time, due to the defect of weak heat conduction ability of the tabs of existing soft-pack batteries, if the battery in the above state experiences thermal runaway, energy will accumulate in the battery, which can easily cause dangerous accidents such as battery explosion. Moreover, such situations are often mainly caused by the insufficient safety of the tab structure and the inability to release energy in time. Therefore, it is urgent to propose a new technical solution to solve the above problems. Utility Model Content
[0003] One of the purposes of the utility model is to provide a safety tab in view of the deficiencies of the prior art, which can not only make the heat dissipation of the tab more directional, but also effectively improve the safety of products with the tab structure.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A safety tab comprises a tab body and a viscous heat release structure sleeved on the tab body, wherein the viscous heat release structure comprises a first part and a second part connected to each other, wherein the first part is arranged on one side of the tab body, and the second part is arranged on the other side of the tab body, and the first part and the second part have a thickness difference.
[0006] As an improvement of the safety tab of the utility model, the thickness of the viscous heat-releasing structure along the first direction is L, and the thickness difference between the first part and the second part along the first direction is △L, satisfying the relationship: 0.1≤△L / L≤0.55.
[0007] As an improvement of the safety tab of the utility model, the thickness of the first portion along the first direction is L1, and the thickness of the second portion along the first direction is L2, satisfying the relationship: 0.3≤L1 / L2≤0.75.
[0008] As an improvement of the safety tab of the utility model, the thickness L1 of the first portion along the first direction and the thickness L2 of the second portion along the first direction satisfy the relationship: 0.33≤L1 / L2≤0.66.
[0009] As an improvement of the safety tab of the utility model, a thickness difference ΔL between the first portion and the second portion along the first direction is L2 - L1.
[0010] As an improvement of the safety tab of the utility model, the thickness of the viscous heat release structure along the second direction is L3, the second direction and the first direction are perpendicular to each other, the thickness of the first part along the second direction is L4, the thickness of the second part along the second direction is L5, and the difference in thickness between the first part and the second part along the second direction is △L a , satisfying the relationship: 0.1≤△L a / L3≤0.55, L4=L1, L5=L2, △L a =L5-L4.
[0011] As an improvement of the safety tab of the utility model, the thickness of the first part is smaller than the thickness of the second part, and a heat dissipation net or a plurality of heat dissipation holes is formed on the surface of the first part.
[0012] As an improvement of the safety tab of the utility model, the first part and / or the second part comprises an adhesive layer and a heat-releasing layer, and the heat-releasing layer is embedded in the adhesive layer.
[0013] As an improvement of the safety tab of the utility model, the adhesive layer wraps each surface of the heat-releasing layer.
[0014] As an improvement of the safety tab of the utility model, the adhesive layer and the heat-releasing layer are alternately arranged along a direction parallel to the surface of the tab body.
[0015] As an improvement of the safety tab of the utility model, the adhesive layer and the heat-releasing layer are stacked in a direction perpendicular to the surface of the tab body.
[0016] As an improvement of the safety tab of the utility model, the melting point of the viscous heat-releasing structure is at least 110° C. to 220° C., and the melting points of the first part and the second part are the same or different.
[0017] As an improvement of the safety tab of the utility model, the tab body is made of metal, and the viscous heat release structure is made of high molecular polymer.
[0018] The second object of the present utility model is to provide a battery, comprising the safety tab as described above.
[0019] The beneficial effect of the utility model is that the safety pole ear of the utility model includes a pole ear body and a viscous heat release structure sleeved on the pole ear body, the viscous heat release structure includes a first part and a second part connected to each other, the first part is arranged on one side of the pole ear body, and the second part is arranged on the other side of the pole ear body, and the first part and the second part have a thickness difference. Since the thickness of the viscous heat release parts on the front and back sides of the pole ear are inconsistent, and the thickness of the viscous heat release part on one side of the pole ear is relatively thin, this relatively thin position can have a faster heat absorption response speed than other positions, so that when the battery cell is bulging or thermal runaway, the battery with the safety pole ear can have a crack on the relatively thin side of the viscous heat release part and release energy in time, effectively avoiding the explosion of the battery, and greatly improving the safety of the pole ear structure and the battery structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] Figure 1 This is a schematic structural diagram of Example 1 of the utility model.
[0021] Figure 2 It is a schematic diagram of the dimensions of the first part and the second part of the viscous heat release structure of Example 1 of the utility model along the first direction.
[0022] Figure 3 It is a schematic diagram of the dimensions of the first part and the second part of the viscous heat release structure of Example 1 of the utility model along the second direction.
[0023] Figure 4 It is a three-dimensional schematic diagram of embodiment 1 of the utility model.
[0024] Figure 5 It is a schematic structural diagram of the viscous heat release structure of Example 2 of the utility model.
[0025] Figure 6 It is a structural schematic diagram of the viscous heat release structure of Example 3 of the utility model.
[0026] Figure 7 This is a schematic structural diagram of Example 4 of the present utility model.
[0027] Figure 8 This is a schematic structural diagram of Example 5 of the present utility model.
[0028] Among them: 1. Ear body; 2. Viscous heat release structure; 2a. Viscous layer; 2b. Heat release layer; 21. First part; 22. Second part; L. Thickness of the viscose heat release structure along the first direction; L1. Thickness of the first part along the first direction; L2. Thickness of the second part along the first direction; L3. Thickness of the viscose heat release structure along the second direction; L4. Thickness of the first part along the second direction; L5. Thickness of the second part along the second direction; T1. First direction; T2. Second direction. DETAILED DESCRIPTION
[0029] If certain words are used in the specification and claims to refer to specific components, those skilled in the art should understand that manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. As mentioned in the entire specification and claims, "including" is an open term, so it should be interpreted as "including but not limited to". In the utility model, unless otherwise clearly specified and limited, the terms "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, or it can be the internal connection of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.
[0030] The following is combined with Figures 1 to 8 The utility model is further described in detail with specific embodiments, but is not intended to limit the utility model.
[0031] Example 1
[0032] A safety tab, see Figures 1 to 4 , including a tab body 1 and a viscous heat release structure 2 sleeved on the tab body 1, wherein the viscous heat release structure 2 includes a first part 21 and a second part 22 connected to each other, the first part 21 is arranged on one side of the tab body 1, and the second part 22 is arranged on the other side of the tab body 1, and the first part 21 and the second part 22 have a thickness difference.
[0033] Specifically, the tab body 1 is sheet-shaped or cube-shaped, and has two opposite surfaces. The first part 21 is arranged on one side of the tab body 1, and the second part 22 is arranged on the other side of the tab body 1, wherein the thickness direction of the tab body 1 is the first direction T1.
[0034] Preferably, the thickness of the viscous heat-releasing structure 2 along the first direction T1 is L, and the thickness difference between the first part 21 and the second part 22 along the first direction T1 is △L, satisfying the relationship: 0.1≤△L / L≤0.15, 0.15≤△L / L≤0.2, 0.2≤△L / L≤0.25, 0.25≤△L / L≤0.3, 0.3≤△L / L≤0.35, 0.35≤△L / L≤0.4, 0.4≤△L / L≤0.45, 0.45≤△L / L≤0.5 or 0.5≤△L / L≤0.55.
[0035] Preferably, see Figure 2, the thickness of the first part 21 is less than the thickness of the second part 22, the thickness of the first part 21 along the first direction T1 is L1, and the thickness of the second part 22 along the first direction T1 is L2, satisfying the relationship: 0.3≤L1 / L2≤0.45, 0.45≤L1 / L2≤0.5, 0.5≤L1 / L2≤0.55, 0.55≤L1 / L2≤0.6 or 0.6≤L1 / L2≤0.75.
[0036] Preferably, a thickness L1 of the first portion 21 along the first direction T1 and a thickness L2 of the second portion 22 along the first direction T1 satisfy the relationship: 0.33≤L1 / L2≤0.66, and a thickness difference ΔL between the first portion 21 and the second portion 22 along the first direction T1 = L2-L1.
[0037] When 0.33L2≤L1≤0.66L2, it can not only ensure the effective packaging of the surface of the tab, but also generate a crack on the thinner side of the viscous heat release structure 2 to release energy in time when a large amount of energy is accumulated.
[0038] Among them, when the operation of the battery causes heat accumulation in the battery tab, the thickness of the viscous heat release part on one side of the tab is relatively thin. This relatively thin position can absorb heat and respond faster than other positions. When the battery cell bulges or thermal runaway occurs, the first part 21 of the viscous heat release structure 2 is relatively thin and can form the required cracks through the heat accumulation effect and release energy in time, effectively avoiding the explosion of the battery and greatly improving the safety of the tab structure and the battery structure.
[0039] Specifically, conventional tabs and the safety tabs of Example 1 are made into battery cells respectively and sent to thermal shock test simultaneously, and the test results in Table 1 below can be obtained:
[0040] sample Fire explode result Conventional tabs Yes Yes NG Safety tabs No No Pass
[0041] Table 1
[0042] It can be seen that the safety battery cell made of the safety tab of Example 1 can release energy through the cracks in the tab, effectively avoiding the occurrence of fire and explosion, and can safely pass the thermal shock test.
[0043] Preferably, see Figure 3 , the width direction of the tab body 1 is the second direction T2, the second direction T2 is perpendicular to the first direction T1, the thickness of the adhesive heat release structure 2 along the second direction T2 is L3, the thickness of the first part 21 along the second direction T2 is L4, the thickness of the second part 22 along the second direction T2 is L5, and the thickness difference between the first part 21 and the second part 22 along the second direction T2 is △L a , satisfying the relationship: 0.1≤△L a / L3≤0.55, L4=L1, L5=L2, △L a =L5-L4, wherein the first portion 21 and the second portion 22 may both be L-shaped layered bending structures.
[0044] Preferably, the melting point of the adhesive heat-releasing structure 2 is at least 110° C. to 220° C., and the melting points of the first part 21 and the second part 22 are the same or different.
[0045] Preferably, a heat dissipation net or a plurality of heat dissipation holes are formed on the surface of the first part 21 to increase the heat dissipation area of the first part 21 .
[0046] Example 2
[0047] Different from Example 1, see Figure 5 The first part 21 and / or the second part 22 includes an adhesive layer 2a and a heat release layer 2b, wherein the heat release layer 2b is embedded in the adhesive layer 2a. The heat release layer 2b is used to accelerate the release of heat, and the adhesive layer 2a is used to bond the tab body 1 and the aluminum-plastic film of the battery cell.
[0048] Preferably, the material of the tab body 1 is metal, the material of the viscous layer 2a and the heat release layer 2b of the viscous heat release structure 2 can both be high molecular polymers, and the specific heat capacity of the heat release layer 2b is smaller than the specific heat capacity of the viscous layer 2a. By reasonably designing the structure of the first part 21 and / or the second part 22, the heat dissipation guidance and heat dissipation efficiency of the viscous heat release structure 2 can be more flexibly adjusted.
[0049] The other structures of this embodiment are the same as those of Embodiment 1 and will not be described again here.
[0050] Example 3
[0051] Different from Example 2, see Figure 6 The adhesive layer 2a wraps each surface of the heat-releasing layer 2b, so that the heat-releasing layer 2b of the adhesive heat-releasing structure 2 will not crack too much when releasing heat, causing the adhesive heat-releasing structure 2 to break.
[0052] The other structures of this embodiment are the same as those of Embodiment 2 and will not be described again here.
[0053] Example 4
[0054] Different from Example 2, see Figure 7 The adhesive layer 2a and the heat-releasing layer 2b are alternately arranged in a direction parallel to the surface of the tab body 1. By reasonably designing the structure of the first part 21 and / or the second part 22, the heat dissipation guidance and heat dissipation efficiency of the adhesive heat-releasing structure 2 can be more flexibly adjusted.
[0055] The other structures of this embodiment are the same as those of Embodiment 2 and will not be described again here.
[0056] Example 5
[0057] Different from Example 2, see Figure 8 The adhesive layer 2a and the heat-releasing layer 2b are stacked in a direction perpendicular to the surface of the tab body 1. By reasonably designing the structure of the first part 21 and / or the second part 22, the heat dissipation guidance and heat dissipation efficiency of the adhesive heat-releasing structure 2 can be more flexibly adjusted.
[0058] The other structures of this embodiment are the same as those of Embodiment 2 and will not be described again here.
[0059] Example 6
[0060] A battery comprises the safety tab of any one of embodiments 1 to 5. Specifically, the battery can be a lithium ion battery, a sodium ion battery, a sodium-lithium ion battery, a magnesium ion battery, etc.
[0061] The safety tab of this scheme has inconsistent thickness of the sticky heat-releasing parts on the front and back sides of the tab, and the sticky heat-releasing part on one side of the tab is relatively thin, resulting in the heat absorption response speed of this relatively thin position being faster than other positions. When the battery cell bulges or thermal runaway occurs, the battery with the safety tab can have cracks on the relatively thin side of the sticky heat-releasing part and release energy in time to avoid battery explosion.
[0062] According to the disclosure and teaching of the above description, those skilled in the art to which the utility model belongs can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by those skilled in the art on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of description and do not constitute any limitation to the utility model.
Claims
1. A safety tab, characterized in that: include: A tab body (1) and a viscous heat release structure (2) sleeved on the tab body (1); The viscous heat-releasing structure (2) comprises a first part (21) and a second part (22) connected to each other, wherein the first part (21) is arranged on one side of the tab body (1), and the second part (22) is arranged on the other side of the tab body (1), and the first part (21) and the second part (22) have a thickness difference.
2. The safety tab according to claim 1, characterized in that: The thickness of the adhesive heat-releasing structure (2) along the first direction is L, and the thickness difference between the first part (21) and the second part (22) along the first direction is ΔL, satisfying the relationship: 0.1≤ΔL / L≤0.
55.
3. The safety tab according to claim 1 or 2, characterized in that: The thickness of the first part (21) along the first direction is L1, and the thickness of the second part (22) along the first direction is L2, satisfying the relationship: 0.3≤L1 / L2≤0.
75.
4. The safety tab according to claim 1 or 2, characterized in that: The thickness of the first part (21) is smaller than the thickness of the second part (22), and a heat dissipation net or a plurality of heat dissipation holes is formed on the surface of the first part (21).
5. The safety tab according to claim 1 or 2, characterized in that: The first part (21) and / or the second part (22) comprises an adhesive layer (2a) and a heat-releasing layer (2b), and the heat-releasing layer (2b) is embedded in the adhesive layer (2a).
6. The safety tab according to claim 5, characterized in that: The adhesive layer (2a) wraps around each surface of the heat-releasing layer (2b).
7. The safety tab according to claim 5, characterized in that: The adhesive layer (2a) and the heat-releasing layer (2b) are alternately arranged along a direction parallel to the surface of the tab body (1).
8. The safety tab according to claim 5, characterized in that: The adhesive layer (2a) and the heat-releasing layer (2b) are stacked in a direction perpendicular to the surface of the tab body (1).
9. The safety tab according to claim 1 or 2, characterized in that: The melting point of the adhesive heat-releasing structure (2) is at least 110° C. to 220° C., and the melting points of the first part (21) and the second part (22) are the same or different.
10. A battery, characterized in that: The invention comprises the safety tab as claimed in any one of claims 1 to 9.