Battery cell and battery with same
By setting the body and extension in the composite foil tab, the metal layer electrical connection of the composite foil tab in the lithium-ion battery is realized, which solves the problem of low energy density and improves the energy density and safety of the battery.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-03-07
- Publication Date
- 2026-03-24
AI Technical Summary
Existing lithium-ion batteries have low energy density, and the poor conductivity between metal layers when using composite current collectors leads to increased battery weight and reduced energy density.
By employing a composite foil tab structure, and by setting a body and an extension on the composite foil, the metal layers of adjacent foil tabs are electrically connected, thus avoiding the use of additional conductive sheets and achieving electrical connection between metal layers.
Without increasing weight, the energy density of the battery cells was increased, the weight of the battery was reduced, and the safety performance was improved.
Smart Images
Figure CN224036599U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model belongs to battery technical field especially relates to a kind of battery and battery with it of electric core. BACKGROUND
[0002] In new energy consumption market, lithium ion battery with its own high energy density Some characteristics, quickly occupied 3C digital consumer market, new energy vehicle market and energy storage application market, with the development of industry, the electrical energy stored in unit mass of lithium ion battery requirement is also higher and higher, that is, the energy density requirement of battery is higher and higher.
[0003] In order to improve the energy density of lithium ion battery, usually use composite current collector instead of traditional metal foil current collector, composite current collector has lower area density on the one hand, can reduce the weight of current collector, thereby improving the energy density of battery;On the other hand, due to the higher ductility of polymer material, when lithium ion battery is impacted by foreign matter, polymer material can wrap the fracture surface, so as to avoid the fracture to pierce the diaphragm and cause short circuit, reduce the risk of thermal runaway, improve the safety performance of lithium ion battery, but due to the lower conductivity of polymer material, the metal layer between the two sides of polymer material cannot be effectively conducted.
[0004] In related art, two layers of metal foil are usually used to clamp composite current collector tab for welding, and then laminating or winding is carried out to weld the tabs of multiple layers of tabs and external tabs together, which increases the weight of battery, thereby reducing the energy density of battery.
[0005] Therefore, the electric core in related art has the problem of low energy density. UTILITY MODEL CONTENTS
[0006] In order to solve the problem of low energy density of electric core in related art, the utility model provides an electric core.
[0007] The electric core of the utility model embodiment comprises positive plate, negative plate and diaphragm,
[0008] At least one of the positive plate and the negative plate comprises composite foil, and the composite foil comprises first metal layer, base film layer and second metal layer which are stacked in sequence;
[0009] The composite foil has current collector and a plurality of foil tabs connected with the current collector, the foil tab has body and extension part extending in the length direction of the composite foil, and the bodies of a plurality of foil tabs are arranged in sequence in the up-down direction;
[0010] The first metal layer of the body of the foil tab is located on the upper side of the base film layer;
[0011] The second metal layer of the body of the upper foil tab is electrically connected with the first metal layer of the lower foil tab;
[0012] The extension of the upper foil tab is bent and extends to the lower side of the body of the lower foil tab, so that the second metal layer of the upper foil tab is electrically connected with the second metal layer of the lower foil tab;
[0013] The second metal layer of the body of the uppermost foil tab is electrically connected with the first metal layer of the foil tab below it;
[0014] The second metal layer of the extension of the lowermost foil tab is electrically connected with the first metal layer of the extension of the foil tab above it.
[0015] Therefore, the first metal layer and the second metal layer of the plurality of foil tabs are connected, that is, the electric core of the embodiment of the utility model realizes the connection of the first metal layer and the second metal layer of the foil tab without increasing the conductive structure (conductive sheet), compared with the traditional electric core connected by the conductive sheet, the electric core of the embodiment of the utility model reduces the weight, and further improves the energy density.
[0016] Therefore, the electric core of the embodiment of the utility model has the characteristics of light weight and high energy density.
[0017] In some embodiments, the foil tabs are at least three,
[0018] In any adjacent three foil tabs, the extension of the upper foil tab is bent and extends between the body of the middle foil tab and the body of the lower foil tab;
[0019] The second metal layer of the extension of the upper foil tab is electrically connected with the second metal layer of the body of the middle foil tab;
[0020] The first metal layer of the extension of the upper foil tab is electrically connected with the first metal layer of the body of the lower foil tab.
[0021] In some embodiments, the plurality of foil tabs are arranged on the same side of the current collector.
[0022] In some embodiments, the first metal layer and the second metal layer of the composite foil of the positive electrode sheet are aluminum layers.
[0023] In some embodiments, the first metal layer and the second metal layer of the composite foil of the negative electrode tab are copper layers.
[0024] In some embodiments, the base film layer is a PE layer or a PET layer.
[0025] In some embodiments, the battery cell is a jelly-roll battery cell or a stacked battery cell.
[0026] In some embodiments, the battery cell is a jelly-roll battery cell, and in the extension direction of the electrode tab, the extension direction of the extension part of the foil tab on the electrode tab of the same layer is the same, and the extension direction of the extension part of the foil tab on the electrode tab of adjacent layers is opposite.
[0027] In some embodiments, the battery cell is a stacked battery cell, and in the extension direction of the electrode tab, the direction of the extension part of the foil tab is the same.
[0028] The utility model also provides a battery.
[0029] The battery of the utility model embodiment comprises the battery cell as described in the above embodiment.
[0030] The utility model discloses the beneficial effects:
[0031] The battery cell of the utility model embodiment sets up the foil tab including the main part and the extension part on the composite foil, and simultaneously makes the first metal layer of the main part of the foil tab be located on the upside of the base film layer, so that in any adjacent foil tab, the second metal layer of the main part of the foil tab located in the upper part is electrically connected with the first metal layer of the foil tab located in the lower part, the extension part of the foil tab located in the upper part is bent and extended to the downside of the main part of the foil tab located in the lower part, so that the second metal layer of the foil tab located in the upper part is electrically connected with the second metal layer of the foil tab located in the lower part, the second metal layer of the main part of the uppermost foil tab is electrically connected with the first metal layer of the foil tab below, and the second metal layer of the extension part of the lowermost foil tab is electrically connected with the first metal layer of the extension part of the foil tab above. Therefore, the connection of the first metal layer and the second metal layer of the composite foil can be realized without increasing the conductive structure (conductive sheet), and compared with the battery cell adopting the conductive sheet to connect the metal layer of the composite foil, the battery cell of the utility model embodiment reduces the weight of the battery cell, and further improves the energy density. BRIEF DESCRIPTION OF DRAWINGS
[0032] In order to more clearly illustrate the technical scheme of the embodiments of the present application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the present application. Obviously, the drawings in the following description are only some embodiments of the present application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.
[0033] Figure 1 is a structural schematic diagram of the electric core of the embodiment of the present application;
[0034] Figure 2 is a structural schematic diagram of the composite foil of the electric core of the embodiment of the present application;
[0035] Figure 3 is a structural schematic diagram of the foil tab of the electric core of the embodiment of the present application;
[0036] Figure 4 is a structural schematic diagram of the positive plate of the electric core of the embodiment of the present application;
[0037] Figure 5 is a structural schematic diagram of the positive plate of the electric core of another embodiment of the present application.
[0038] In the drawings:
[0039] 1, positive plate;
[0040] 2, negative plate;
[0041] 3, diaphragm;
[0042] 4, composite foil; 401, first metal layer; 402, second metal layer; 403, base film layer;
[0043] 5, foil tab; 501, body; 502, extension. DETAILED DESCRIPTION
[0044] In order to make the technical problems, technical schemes and beneficial effects solved by the present application more clearly understood, the present application will be further described in detail below in combination with the drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and do not limit the present application.
[0045] In the description of the utility model, it needs to be understood that, the orientation or position relation indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relation based on the drawings shown, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more than two.
[0046] In the description of the utility model, it needs to be understood that, the orientation or position relation indicated by the terms "longitudinal", "radial", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer" and the like is the orientation or position relation based on the drawings shown, and is only for the convenience of describing the utility model and simplifying the description, and therefore cannot be understood as a limitation on the utility model. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more than two.
[0047] The following will be described in detail in combination with the drawings of the utility model. Figures 1-5 The utility model discloses an electric core.
[0048] The utility model discloses an electric core.
[0049] As shown in the figure, Figures 1-2 The first metal layer 401 of the body 501 of the foil tab 5 is located on the upper side of the base film layer 403, and the second metal layer 402 is located on the lower side of the base film layer 403.
[0050] The composite foil material 4 has a current collector and a plurality of foil tabs 5 connected with the current collector, the foil tab 5 has a body 501 and an extension 502 extending in the length direction of the composite foil material 4, and the bodies 501 of the plurality of foil tabs 5 are sequentially arranged in the up-down direction.
[0051] As shown in the figure, Figure 3 The first metal layer 401 of the body 501 of the foil tab 5 is located on the upper side of the base film layer 403, and the second metal layer 402 is located on the lower side of the base film layer 403.
[0052] In any adjacent foil tabs 5, the second metal layer 402 of the body 501 of the upper foil tab 5 is electrically connected to the first metal layer 401 of the lower foil tab 5; the extension 502 of the upper foil tab 5 is bent and extended to the lower side of the body 501 of the lower foil tab 5, so that the second metal layer 402 of the upper foil tab 5 is electrically connected to the second metal layer 402 of the lower foil tab 5.
[0053] The second metal layer 402 of the body 501 of the uppermost foil tab 5 is electrically connected to the first metal layer 401 of the foil tab 5 below it.
[0054] The second metal layer 402 of the extension 502 of the bottommost foil tab 5 is electrically connected to the first metal layer 401 of the extension 502 of the foil tab 5 above it.
[0055] Thus, the first metal layer 401 and the second metal layer 402 of the multiple foil tabs 5 are connected. In other words, the battery cell of this utility model embodiment achieves the connection of the first metal layer 401 and the second metal layer 402 of the foil tabs 5 without adding a conductive structure (conductive sheet). Compared with the traditional battery cell that uses conductive sheets to connect the metal layers of composite foil, the battery cell of this utility model embodiment reduces weight and thus increases energy density.
[0056] Therefore, the battery cell of this utility model embodiment has the characteristic of high energy density.
[0057] In some embodiments, the number of foil tabs 5 can be 2, 3, 4, 5, 6 or more, and the specific number of foil tabs 5 can be designed according to the performance requirements of the battery cell.
[0058] In some embodiments, the foil tabs 5 are at least three, wherein,
[0059] like Figure 3 As shown, in any three adjacent foil tabs 5, the extension 502 of the upper foil tab 5 is bent and extended to the space between the body 501 of the middle foil tab 5 and the body 501 of the lower foil tab 5. The second metal layer 402 of the extension 502 of the upper foil tab 5 is electrically connected to the second metal layer 402 of the body 501 of the middle foil tab 5. The first metal layer 401 of the extension 502 of the upper foil tab 5 is electrically connected to the first metal layer 401 of the body 501 of the lower foil tab 5.
[0060] Thus, the first metal layer 401 and the second metal layer 402 of each of the multiple foil tabs 5 are connected. In other words, the battery cell of this utility model embodiment achieves the connection of the first metal layer 401 and the second metal layer 402 of the foil tabs 5 without adding a conductive structure (conductive sheet). Compared with the traditional battery cell that uses conductive sheets for connection, the battery cell of this utility model embodiment reduces weight and thus improves energy density.
[0061] In some embodiments, a plurality of foil tabs 5 are disposed on the same side of the current collector.
[0062] The present invention provides a battery cell by placing multiple foil tabs 5 on the same side of the current collector, which facilitates the connection of multiple foil tabs 5 and also reduces the size of the battery cell, thereby increasing the energy density of the battery cell.
[0063] In some embodiments, the first metal layer 401 and the second metal layer 402 of the composite foil 4 of the positive electrode 1 are aluminum layers.
[0064] In some embodiments, the first metal layer 401 and the second metal layer 402 of the composite foil 4 of the negative electrode 2 are copper layers.
[0065] In some embodiments, the base film layer 403 is a PE layer or a PET layer.
[0066] In some embodiments, the battery cell is a wound battery cell or a laminated battery cell.
[0067] In some embodiments, such as Figure 3 As shown, multiple foil tabs 5 are arranged sequentially in the vertical direction, and the bending directions of the extensions 502 of adjacent foil tabs 5 are opposite, so as to connect the first metal layer 401 and the second metal layer 402 of the foil tabs 5.
[0068] It is understandable that, in order to form the above structure, the arrangement of the extension portion 502 of the foil tab 5 of different cells will inevitably be different.
[0069] For example, such as Figure 4 As shown, taking the positive electrode 1 as an example, when the cell is a wound cell, in the extension direction of the electrode, that is, the direction from the beginning to the end of the electrode in the figure, the dotted line in the figure indicates that the electrode is bent and wound at this point. The extension direction of the foil tab 5 extension 502 on the electrode in the same layer is the same, and the extension direction of the foil tab 5 extension 502 on the electrode in adjacent layers is opposite. This allows multiple foil tabs 5 to be arranged sequentially in the vertical direction and the bending direction of the extension 502 of adjacent foil tabs 5 to be opposite.
[0070] For example, such as Figure 5As shown, taking the positive plate 1 as an example, when the battery cell is a stacked plate battery cell, in the extension direction of the plate, that is, the direction from the beginning end to the end of the plate in the figure, the extension direction of the extension part 502 of the foil tab 5 is the same, and the dashed line in the figure indicates that the plate is bent at this point to stack the plates.
[0071] It can be understood that the plate of the stacked plate battery cell is arranged in an S shape, so that the extension directions of the extension parts 502 of the foil tabs 5 of adjacent layers are opposite, so that the plurality of foil tabs 5 are sequentially arranged in the up-down direction, and the bending directions of the extension parts 502 of the adjacent foil tabs 5 are opposite.
[0072] The utility model discloses a battery.
[0073] The battery of the utility model embodiment comprises the battery cell described in the above embodiment.
[0074] The battery of the utility model embodiment can improve the energy density of the battery by setting the battery cell of the above embodiment.
[0075] The above-mentioned embodiments are only used to illustrate the technical solutions of the utility model, and not to limit them; although the utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that: it can still modify the technical solutions recorded in the foregoing embodiments, or make equivalent replacement to part of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and range of the technical solutions of the embodiments of the utility model, and all should be included in the protection scope of the utility model.
Claims
1. An electric cell, characterized by, The battery includes a positive electrode sheet (1), a negative electrode sheet (2), and a separator (3), At least one of the positive electrode sheet (1) and the negative electrode sheet (2) includes a composite foil (4) including a first metal layer (401), a base film layer (403), and a second metal layer (402) stacked in this order. The composite foil (4) has a current collector and a plurality of foil tabs (5) connected to the current collector, the foil tab (5) has a body (501) and an extension (502) extending in the length direction of the composite foil (4), and the bodies (501) of the plurality of foil tabs (5) are arranged in the up-down direction in this order. The first metal layer (401) of the body (501) of the foil tab (5) is located on the upper side of the base film layer (403). In any adjacent foil tabs (5), the second metal layer (402) of the body (501) of the upper foil tab (5) is electrically connected to the first metal layer (401) of the lower foil tab (5). The extension (502) of the upper foil tab (5) is bent and extends to the lower side of the body (501) of the lower foil tab (5), so that the second metal layer (402) of the upper foil tab (5) is electrically connected to the second metal layer (402) of the lower foil tab (5). The second metal layer (402) of the body (501) of the uppermost foil tab (5) is electrically connected to the first metal layer (401) of the foil tab (5) located below it. The second metal layer (402) of the extension (502) of the lowermost foil tab (5) is electrically connected to the first metal layer (401) of the extension (502) of the foil tab (5) located above it.
2. The electric cell of claim 1, wherein, The foil tab (5) is at least three, In any three adjacent foil tabs (5), the extension (502) of the upper foil tab (5) is bent and extends between the body (501) of the middle foil tab (5) and the body (501) of the lower foil tab (5). The second metal layer (402) of the extension (502) of the upper foil tab (5) is electrically connected to the second metal layer (402) of the body (501) of the middle foil tab (5). The first metal layer (401) of the extension (502) of the upper foil tab (5) is electrically connected to the first metal layer (401) of the body (501) of the lower foil tab (5).
3. The electric cell of claim 1, wherein, The plurality of foil tabs (5) are arranged on the same side of the current collector.
4. The electric cell of claim 1, wherein, The first metal layer (401) and the second metal layer (402) of the composite foil (4) of the positive electrode sheet (1) are aluminum layers.
5. The electric cell of claim 1, wherein, The first metal layer (401) and the second metal layer (402) of the composite foil (4) of the negative electrode sheet (2) are copper layers.
6. The electric cell of claim 1, wherein, The base film layer (403) is a PE layer or a PET layer.
7. The electric cell of claim 1, wherein, The electric core is a winding electric core or a laminated electric core.
8. The electric cell of claim 7, wherein, The electric core is a winding electric core, and in the extension direction of the electrode sheet, the extension direction of the extension part (502) of the foil tab (5) on the electrode sheet of the same layer is the same, and the extension direction of the extension part (502) of the foil tab (5) on the electrode sheet of adjacent layers is opposite.
9. The electric cell of claim 7, wherein, The electric core is a laminated electric core, and in the extension direction of the electrode sheet, the direction of the extension part (502) of the foil tab (5) is the same.
10. A battery, characterized by An electric core comprising any of the features of claims 1-9.