Pole piece and tab structure and battery
By using a staggered connection structure for the inner tabs of the lithium-ion battery cell, the problem of insufficient space at the head of the battery cell caused by the stacking thickness of the inner tabs is solved, thereby improving the volumetric energy density of the battery cell.
Patent Information
- Application Number
- CN202423080283.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2026-01-06
- Estimated Expiration
- 2034-12-13
AI Technical Summary
When the thickness of the existing lithium-ion battery cell's single-tab structure is large, the inner tab is not easy to bend, resulting in insufficient space at the head of the cell and affecting the cell's volumetric energy density.
The design of staggered connection of the inner tabs of the first and second electrodes reduces the stacking thickness of the inner tabs and increases the space utilization rate in the length direction of the cell head.
By using a staggered connection inner tab structure, the space requirement at the head of the battery cell is reduced, thereby increasing the volumetric energy density of the battery cell.
Smart Images
Figure CN223771296U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the technical field of lithium-ion batteries, and in particular to an electrode tab structure and a battery. Background Technology
[0002] The conventional structure of the inner tab in the single-tab structure of existing lithium-ion battery cells is to stack multiple foils after they have been cut, and then form the battery cell tab by welding the outer tabs. When the number of battery cell layers is thick, the stack thickness of the inner tab is large. As the stack thickness increases, the inner tab is not easy to bend, requiring more space for buffering in the length direction of the battery cell head, which in turn affects the space at the battery cell head. Utility Model Content
[0003] To solve the above-mentioned technical problems, this utility model proposes an electrode tab structure and a battery.
[0004] To achieve the above objectives, the present invention adopts the following technical solution:
[0005] In a first aspect, the present invention provides an electrode tab structure, comprising a first electrode and a second electrode with the same polarity, wherein the first electrode has a first electrode tab and the second electrode has a second electrode tab, and the second electrode tab and the first electrode tab are connected in a staggered manner.
[0006] Furthermore, both the inner tab of the second electrode and the inner tab of the first electrode have a sheet-like structure.
[0007] Secondly, this utility model also provides a battery, the battery comprising two electrode tab structures as described in any one of the above, the two electrode tab structures having different polarities.
[0008] Furthermore, one of the electrode tab structures is positive, and the other electrode tab structure is negative.
[0009] Furthermore, the battery also includes a separator disposed between the two electrode tab structures.
[0010] In summary, the beneficial effects of this utility model are as follows:
[0011] The electrode tab structure of this utility model has an inner tab of the first electrode and an inner tab of the second electrode that are staggered and connected. That is, the same inner tab stacking thickness corresponds to the same length space of the cell head. By staggering the inner tabs, the stacking thickness of the inner tabs is reduced, which can increase the space utilization rate of the cell head length direction. Attached Figure Description
[0012] Figure 1 This is a front view of the electrode tab structure of this utility model;
[0013] Figure 2 This is a side view of the electrode tab structure of this utility model;
[0014] Figure 3 This is a top view of the electrode tab structure of this utility model.
[0015] Attached Figure
[0016] First electrode 1, second electrode 2, inner electrode tab of first electrode 11, inner electrode tab of second electrode 21, inner electrode tab mapping position 3. Detailed Implementation
[0017] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions in the embodiments of this utility model will be clearly and completely described below. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.
[0018] Please see Figures 1-3 Firstly, this utility model provides an electrode tab structure, including a first electrode 1 and a second electrode 2 of the same polarity. The first electrode has a first inner electrode tab 11, and the second electrode has a second inner electrode tab 21, which are misaligned with the first inner electrode tab. It is understood that the number of electrodes included in the electrode tab structure is not limited; that is, the electrode tab structure may include at least two electrodes of the same polarity. Specifically, the electrode tab structure may include a first electrode, a second electrode, a third electrode, etc., as long as the electrodes have the same polarity.
[0019] In one embodiment, both the inner tab of the second electrode and the inner tab of the first electrode are sheet-like structures.
[0020] In one embodiment, the inner tabs of the first electrode and the inner tabs of the second electrode are located on the same side.
[0021] Secondly, this utility model also provides a battery comprising two electrode tab structures as described above, wherein the two electrode tab structures have different polarities. It is understood that one of the electrode tab structures is positive, and the other is negative. The inner tab mapping position 3 on the negative electrode tab structure coincides with that on the positive electrode tab structure.
[0022] It is understood that the application scenarios of the electrode tab structure are not limited. For example, in this embodiment, the electrode tab structure is applied to the battery. It is understood that in other embodiments, the electrode tab structure can also be applied to non-battery structures, as long as the non-battery structure includes the electrode tab structure of this utility model.
[0023] It is understood that there are no limitations on the shape or type of the battery. The battery can be a lithium-ion battery, a pouch battery, etc.
[0024] It is understood that the polarity, type, and shape of the electrode tab structure are not limited, and the electrode tab structure can be positive or negative polarity.
[0025] It is understood that when the electrode tab structure is applied to a battery, the positive electrode and / or negative electrode can be the electrode tab structure disclosed in this utility model. For example, the electrode tab structure disclosed in this utility model can be applied to the positive electrode; when the positive electrode is the electrode tab structure disclosed in this utility model, the negative electrode has a conventional structure. As another example, the electrode tab structure disclosed in this utility model can be applied to the negative electrode; when the negative electrode is the electrode tab structure disclosed in this utility model, the positive electrode has a conventional structure. Furthermore, the electrode tab structure disclosed in this utility model can also be applied to both the positive and negative electrodes.
[0026] In one embodiment, the battery further includes a separator disposed between the two electrode tab structures.
[0027] In one embodiment, the battery further includes a housing, in which the separator and the two electrode tab structures are housed. It is understood that the battery may also include other components; however, since the technical solution protected by this utility model is the electrode tab structure and its application, it will not be elaborated upon here.
[0028] The electrode tab structure of this utility model has the first inner electrode tab and the second inner electrode tab (foil tab) designed to overlap. The bending angle of the foil tab is directionally related to the cell thickness. That is, when the cell thickness is large, as shown in the attached... Figure 1 The value of F1 will decrease, which will increase the proportion of space required at the head of the cell, resulting in a decrease in the volumetric energy density of the cell.
[0029] The inner tabs of the first and second electrodes (foil tabs) are designed with a staggered stacking structure, which can increase the bendable angle of the overall foil tabs and increase the value of F1, thereby reducing the required length of the cell head space and improving the volumetric energy density of the cell.
[0030] The value of C1 ranges from 0.001 μm to (A1-E1-E2-D1-E3-B1) μm;
[0031] The value range of F1 is 0μm to (B2)μm.
[0032] Specifically, attached Figure 1-3 middle,
[0033] A1 is the width of one layer of electrode in the battery cell; A2 is the length of one layer of electrode in the battery cell;
[0034] B1 is the width of a single layer of positive electrode inner tab (foil tab); B2 is the length of a single layer of positive electrode inner tab (foil tab);
[0035] C1 is the distance between the inner tabs of the first and second layers (each layer is calculated starting from the left side of the inner tab in the main view);
[0036] D1 is the width of the negative electrode inner tab;
[0037] E1 is the distance between the left side of the inner tab of the electrode and the left side of the electrode itself; E2 is the distance between the right side of the inner tab of the negative electrode and the right side of the electrode it is mapped onto; E3 is the distance between the right side of the inner tab of the rightmost positive electrode and the left side of the inner tab of the negative electrode.
[0038] F1 represents the length of the space saved in the head space of the battery cell by bending the tabs.
[0039] E3 is 0 < E3 < E1 + B1, and greater than 0: to prevent short circuit when the positive and negative electrodes are in contact.
[0040] When C1 is 0, F1 is 0μm;
[0041] When C1 takes the value of 1 / 2*(B1), F1 is 0.5μm;
[0042] When C1 is B1, F1 is 2μm.
[0043] The electrode tab structure of this utility model has an inner tab of the first electrode and an inner tab of the second electrode that are staggered and connected. That is, the same inner tab stacking thickness corresponds to the same length space of the cell head. By staggering the inner tabs, the stacking thickness of the inner tabs is reduced, which can increase the space utilization rate of the cell head length direction.
[0044] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of this utility model and are not intended to limit the scope of protection of this utility model. Although this utility model has been described in detail with reference to preferred embodiments, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of this utility model without departing from the essence and scope of the technical solutions of this utility model.
Claims
1. A tab structure of a pole piece, characterized in that, The battery includes first and second polar tabs of the same polarity, the first polar tab having a first polar tab inner lug, the second polar tab having a second polar tab inner lug, the second polar tab inner lug and the first polar tab inner lug being misaligned.
2. The pole piece tab structure of claim 1, wherein The second polar tab inner lug and the first polar tab inner lug are both in a tab-like structure.
3. A battery, characterized by The battery includes two polar tab structures as claimed in any one of claims 1-2, the polarities of the two polar tab structures being different.
4. The battery of claim 3, wherein the cathode is a lithium cobalt oxide cathode. The polarity of one of the polar tab structures is positive, and the polarity of the other of the polar tab structures is negative.
5. The battery of claim 3, wherein the cathode comprises a cathode active material, a cathode binder, and a cathode conductive agent. The battery further includes a separator, the separator being disposed between the two polar tab structures.