A battery cell structure and battery
By using bent connected pole ear segments in the battery cell structure and covering the protective member, the problems of ear flap and shell corrosion and short circuit of the all-pole ear cylindrical battery are solved, and higher battery cell safety is achieved.
Patent Information
- Application Number
- CN202420504580.7
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-03-15
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-03-15
AI Technical Summary
The existing all-pole ear cylindrical batteries are prone to tilt out during the horizontal axis of the ear, causing the contact between the ear and the shell, causing the risk of shell corrosion and short circuit.
A battery cell structure is adopted, wherein the electrode ear monomer consists of a first electrode ear segment and a second electrode ear segment that are bent connected, and the surface is protected by a protective member, which wraps the connection of the electrode ear segment to prevent the electrode ear from tilting out and contacting the housing.
It effectively solves the problem of volute ears, prevents contact between the electrodes and the shell, reduces the risk of shell corrosion and short circuit, and improves the safety of the battery cell structure.
Smart Images
Figure CN222705650U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of batteries, and specifically relates to a battery core structure and a battery. Background Art
[0002] In the existing battery production, the production and preparation of full-tab cylindrical batteries easily cause the tabs of the battery to turn outward. The existing tabs lack the corresponding protective layer, which causes the tabs to turn outward and also causes the tabs to contact the shell, causing the shell to corrode and short circuit. Therefore, it is urgent to propose a new technical solution to solve the above problem. Utility Model Content
[0003] One of the purposes of the utility model is to provide a battery core structure to address the deficiencies of the prior art, which not only solves the problem of tab eversion, but also prevents the tab from contacting the metal shell and causing the risk of shell corrosion and short circuit.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] A battery cell structure comprises a battery cell, wherein one end of the battery cell has a plurality of pole lug monomers arranged alternately, each of the pole lug monomers comprises a first pole lug segment and a second pole lug segment that are bent and connected, and surfaces of the first pole lug segment and the second pole lug segment are protected by a protective component, and the protective component wraps the connection between the first pole lug segment and the second pole lug segment.
[0006] As an improvement of the battery core structure of the utility model, the protection component includes a first protection portion and a second protection portion connected to each other, the first protection portion is arranged on the plurality of tab monomers, and the second protection portion is arranged on the side of the battery core.
[0007] As an improvement of the battery core structure of the present utility model, the surface of the first pole lug segment is perpendicular to the central axis of the battery core, and the surface of the second pole lug segment is parallel to the central axis of the battery core.
[0008] As an improvement of the battery core structure of the utility model, the first protection part includes a first protection surface and a second protection surface connected to each other, the first protection surface is laid on the surface of the first pole lug segment, and the second protection surface is laid on the surface of the second pole lug segment.
[0009] As an improvement of the battery cell structure of the present invention, the length of the first pole lug segment or the length of the second pole lug segment is smaller than the length of the first protective portion along a direction parallel to the central axis of the battery cell.
[0010] As an improvement of the battery cell structure of the present invention, the total length of the first pole lug segment and the second pole lug segment is greater than the length of the first protective portion along a direction parallel to the central axis of the battery cell.
[0011] As an improvement of the battery core structure of the utility model, the protection component also includes a reinforced protection part, the first protection surface and the second protection surface are both connected to the reinforced protection part, and the reinforced protection part is superimposed on the first protection surface and / or the second protection surface.
[0012] As an improvement of the battery core structure of the utility model, the width of the first protective surface is W1, and the width of the second protective surface is W2, satisfying the relationship: 0.7≤W1 / W2≤1.25.
[0013] As an improvement of the battery cell structure of the present invention, the length of the first protection portion along a direction parallel to the central axis of the battery cell is L, and the length of the second pole ear section is L2, satisfying the relationship: 1≤L / L2≤2.
[0014] The second purpose of the present utility model is to provide a battery, including the battery cell structure as described above.
[0015] The beneficial effects of the utility model are as follows: the battery cell structure of the utility model includes a battery cell, one end of the battery cell has a plurality of pole ear monomers arranged alternately, each pole ear monomer includes a first pole ear segment and a second pole ear segment that are bent and connected, the surfaces of the first pole ear segment and the second pole ear segment are both protected by a protective component, the protective component wraps the connection between the first pole ear segment and the second pole ear segment, wherein the protective performance of the protective component itself can tighten the first pole ear segment and the second pole ear segment inwardly, thereby effectively solving the problem of the pole ear eversion, and the protective component can prevent the pole ear from contacting the battery shell, further effectively improving the safety of the battery cell structure. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] Figure 1 This is a schematic structural diagram of Example 1 of the utility model.
[0017] Figure 2 This is a schematic diagram of the dimensions of the second pole lug segment of Example 1 of the utility model.
[0018] Figure 3 This is a schematic diagram of the dimensions of the first protective surface and the second protective surface of Example 1 of the utility model.
[0019] Figure 4 This is a schematic structural diagram of the protection component of Example 2 of the utility model.
[0020] Figure 5 This is a schematic structural diagram of Example 3 of the present utility model.
[0021] Among them: 1. battery cell; 2. pole lug monomer; 21. first pole lug segment; 22. second pole lug segment; 3. protection component; 31. first protection part; 311. first protection surface; 312. second protection surface; 32. second protection part; 33. reinforced protection part; L, the length of the first protection part along the direction parallel to the central axis of the battery cell; L1, the length of the first pole lug segment; L2, the length of the second pole lug segment; W1, the width of the first protection surface; W2, the width of the second protection surface. DETAILED DESCRIPTION
[0022] 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.
[0023] The following is combined with Figures 1 to 5 The utility model is further described in detail with specific embodiments, but is not intended to limit the utility model.
[0024] Example 1
[0025] A cell structure, see Figures 1 to 3 , including a battery cell 1, one end of the battery cell 1 has a plurality of pole lug monomers 2 arranged alternately, each pole lug monomer 2 includes a first pole lug segment 21 and a second pole lug segment 22 that are bent and connected, the surfaces of the first pole lug segment 21 and the second pole lug segment 22 are both covered and protected by a protective component 3, and the protective component 3 wraps the connection between the first pole lug segment 21 and the second pole lug segment 22.
[0026] Preferably, the protective component 3 includes a first protective portion 31 and a second protective portion 32 connected to each other, the first protective portion 31 is arranged on a plurality of tab units 2, and the second protective portion 32 is arranged on the side of the battery cell 1, wherein the first protective portion 31 and the second protective portion 32 are both made of insulating materials, and the first protective portion 31 and the second protective portion 32 can provide insulating buffering protection to the protected position.
[0027] Preferably, the surface of the first tab segment 21 is perpendicular to the central axis of the battery cell 1, the surface of the second tab segment 22 is parallel to the central axis of the battery cell 1, and the first tab segment 21 is connected to the electrode tab of the battery cell 1 through the second tab segment 22. After the tab monomers 2 arranged alternately are flattened, the first protection part 31 can prevent the tabs from turning outwards. At the same time, after the battery cell 1 is put into the shell, the first protection part 31 also plays a role in isolating the tabs to prevent them from contacting the shell, thereby effectively preventing the shell corrosion and short circuit of the battery cell 1 during use.
[0028] Specifically, the battery cell 1 is a wound core, and the battery cell 1 has a tab area (the height of the tab area before flattening is H1, and the height of the tab area after flattening is H4) and a coating area. Before the tabs are flattened, the protection member 3 (with a total height of H2 and a height in the tab area of H3) is pasted, so that H1 > H3, that is, the total length of the first tab segment 21 and the second tab segment 22 is greater than the length of the first protection part 31 along the direction parallel to the central axis of the battery cell 1. At the same time, make H2 > H3 and H3 > H4, so as to achieve the beneficial effect that the surfaces of the first tab segment 21 and the second tab segment 22 are both covered and protected by the protection member 3, and the protection member 3 wraps the connection part of the first tab segment 21 and the second tab segment 22.
[0029] Preferably, referring to Figure 2 , the length of the second tab segment 22 is L2, and the length of the first protection part 31 along the direction parallel to the central axis of the battery cell 1 is L, satisfying the relational expression: 1 < L / L2 ≤ 1.2, 1.2 ≤ L / L2 ≤ 1.4, 1.4 ≤ L / L2 ≤ 1.6, 1.6 ≤ L / L2 ≤ 1.8 or 1.8 ≤ L / L2 ≤ 2, so as to more fully protect the tabs.
[0030] Preferably, the first protection part 31 includes a connected first protection surface 311 and a second protection surface 312. The first protection surface 311 is laid on the surface of the first tab segment 21, and the second protection surface 312 is laid on the surface of the second tab segment 22.
[0031] Preferably, referring to Figure 3 , the width of the first protection surface 311 is W1, and the width of the second protection surface 312 is W2, satisfying the relational expression: 0.7 ≤ W1 / W2 ≤ 0.85, 0.85 ≤ W1 / W2 ≤ 0.95, 0.95 ≤ W1 / W2 ≤ 1.05, 1.05 ≤ W1 / W2 ≤ 1.15 or 1.15 ≤ W1 / W2 ≤ 1.25, so as to more flexibly optimize the structure of the protection member 3 and adjust the protection performance of the protection member 3.
[0032] Embodiment 2
[0033] Different from Embodiment 1, referring to Figure 4The protection component 3 of this embodiment also includes a reinforced protection part 33. The first protection part 31, the second protection part 32 and the reinforced protection part 33 are integrally formed. The first protection surface 311 and the second protection surface 312 are both connected to the reinforced protection part 33. The reinforced protection part 33 is superimposed on the first protection surface 311 and the second protection surface 312. By increasing the thickness of the protection component 3 by the reinforced protection part 33, the ability to prevent the tab from everting outward can be effectively improved, and the tab can be isolated to prevent it from contacting the shell with a better barrier ability.
[0034] In some embodiments, the enhanced protection portion 33 may be only stacked on the first protection surface 311 or the second protection surface 312 to enhance the protection performance of the first protection surface 311 or the second protection surface 312 .
[0035] The other structures of this embodiment are the same as those of Embodiment 1 and will not be described again here.
[0036] Example 3
[0037] Unlike Example 1 or 2, see Figure 5 In this embodiment, the length of the first pole ear segment 21 is L1, and the length of the first protective portion 31 along the direction parallel to the central axis of the battery cell 1 is L, satisfying the relationship: 0.6≤L1 / L≤0.7, 0.7≤L1 / L≤0.8, 0.8≤L1 / L≤0.9 or 0.9≤L1 / L<1, wherein the length of the first pole ear segment 21 can be set as needed according to the flattening requirement of the pole ear monomer 2 of the battery cell 1.
[0038] In some embodiments, the length of the first protection portion 31 along the direction parallel to the central axis of the battery cell 1 is L, and the length of the second pole ear section 22 is L2, satisfying the relationship: L=L2. When the pole ear is flattened, since the first protection surface 311 is flattened together with the pole ear, the height H3 of the protection component 3 in the pole ear area can be made equal to the height H4 of the pole ear area after flattening. In this way, the protection component 3 can provide a supporting and tightening effect on the pole ear to prevent the pole ear from turning outward, while also reducing the damage to the pole ear caused by flattening, effectively reducing the generation of metal chips.
[0039] The other structures of this embodiment are the same as those of Embodiment 1 or 2 and will not be described again here.
[0040] Example 4
[0041] A battery comprises the battery cell structure of any one of embodiments 1 to 3. Specifically, the battery may be a lithium ion battery, a sodium ion battery, a sodium lithium ion battery, a magnesium ion battery, etc. The battery may be a cylindrical battery.
[0042] Among them, the pole piece of the cylindrical battery adopts a full-ear structure, and the way of flattening the ear can reduce the complexity of the battery cell manufacturing process, further simplify the process, greatly reduce the internal resistance of the prepared battery, achieve high-rate charging and discharging capabilities, and also increase the energy density of the battery. Compared with the existing problem of the ear eversion of the full-ear cylindrical battery after the ear is flattened, there is a risk of the ear eversion causing the ear to contact the shell and cause shell corrosion and short circuit. The utility model can pre-paste protective tape on the end of the ear before the ear flattening process. The protective tape can provide an inward support force when flattening, thereby preventing the ear from everting outward when flattening.
[0043] Specifically, a protective tape is pasted on the end of the pole ear in advance, and the pasting height is higher than the height of the pole ear after flattening, and lower than the height of the pole ear before flattening. For example, the height of the pole ear area before flattening is H1, the height of the protective glue is H2, the height of the protective glue in the pole ear area is H3, and the height of the pole ear area after flattening is H4, satisfying the relationship: H1>H3, H2>H3, H3>H4, so that the protective tape can effectively prevent the pole ear from turning outward when flattening. In addition, pasting the protective tape before flattening can also reduce the metal shavings generated by the pole ear when flattening, reduce the risk of micro-short circuit of the battery cell, thereby effectively improving the hi-pot pass rate of the withstand voltage insulation test of the battery cell.
[0044] 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 battery cell structure, characterized in that: It comprises a battery cell (1), wherein one end of the battery cell (1) has a plurality of tab monomers (2) arranged alternately; Each of the tab monomers (2) comprises a first tab segment (21) and a second tab segment (22) which are connected by bending; The surfaces of the first pole lug segment (21) and the second pole lug segment (22) are both protected by being coated with a protective component (3), and the protective component (3) wraps the connection between the first pole lug segment (21) and the second pole lug segment (22).
2. The battery cell structure according to claim 1, characterized in that: The protection component (3) comprises a first protection portion (31) and a second protection portion (32) which are connected to each other, wherein the first protection portion (31) is arranged on a plurality of the tab monomers (2), and the second protection portion (32) is arranged on a side of the battery cell (1).
3. The battery cell structure according to claim 2, characterized in that: The surface of the first pole lug segment (21) is perpendicular to the central axis of the battery core (1), and the surface of the second pole lug segment (22) is parallel to the central axis of the battery core (1).
4. The battery cell structure according to claim 2 or 3, characterized in that: The first protection portion (31) comprises a first protection surface (311) and a second protection surface (312) connected to each other, the first protection surface (311) being laid on the surface of the first pole lug segment (21), and the second protection surface (312) being laid on the surface of the second pole lug segment (22).
5. The battery cell structure according to claim 2 or 3, characterized in that: The length of the first pole lug segment (21) or the length of the second pole lug segment (22) is smaller than the length of the first protection portion (31) along a direction parallel to the central axis of the battery cell (1).
6. The battery cell structure according to claim 2 or 3, characterized in that: The total length of the first pole lug segment (21) and the second pole lug segment (22) is greater than the length of the first protection portion (31) along a direction parallel to the central axis of the battery cell (1).
7. The battery cell structure according to claim 4, characterized in that: The protection component (3) further comprises a reinforced protection portion (33), the first protection surface (311) and the second protection surface (312) are both connected to the reinforced protection portion (33), and the reinforced protection portion (33) is superimposed on the first protection surface (311) and / or the second protection surface (312).
8. The battery cell structure according to claim 4, characterized in that: The width of the first protective surface (311) is W1, and the width of the second protective surface (312) is W2, satisfying the relationship: 0.7≤W1 / W2≤1.
25.
9. The battery cell structure according to claim 6, characterized in that: The length of the first protection portion (31) in a direction parallel to the central axis of the battery cell (1) is L, and the length of the second pole lug section (22) is L2, satisfying the relationship: 1≤L / L2≤2.
10. A battery, characterized in that: The invention comprises a battery core structure as claimed in any one of claims 1 to 9.