Pole piece structure, battery and electric equipment
By setting up reinforcements on the blank area of the single-sided coating area of the battery pole sheet, the problem of the pole sheet being curled after rolling is solved, and the winding effect of the battery cell and product advantage are improved.
Patent Information
- Application Number
- CN202420245338.2
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-02-01
- Publication Date
- 2025-02-28
- Estimated Expiration
- 2034-02-01
AI Technical Summary
The existing battery pole plate is easily curled after rolling, affecting the winding effect of the battery cell and increasing the product's defect rate.
Reinforcements are provided on the blank area of the single-sided coating area of the pole sheet body to enhance the strength of the single-sided coating area and avoid curling.
By setting the reinforcement, the strength of the pole piece structure is improved, the risk of curling is reduced, and the winding effect and product advantage of the battery cell are improved.
Smart Images
Figure CN222546361U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of batteries, and specifically relates to a pole piece structure, a battery and an electrical device. Background Art
[0002] At present, batteries usually use a wound cell structure. The battery pole piece usually has a single-sided coating area at the head or tail, that is, one side is coated with active material and the other side is empty foil. This design can maximize the use of the internal space of the battery cell and improve the energy density of the battery cell. However, during the rolling process of the pole piece, the side of the single-sided coating area coated with active material is extended, and the side of the single-sided coating area not coated with active material is not extended, causing the single-sided coating area to curl after rolling, thereby affecting the winding effect of the battery cell and increasing the defective rate of the product. Utility Model Content
[0003] The purpose of the utility model is to provide a pole piece structure to solve the technical problem in the prior art that the single-sided coating area curls after rolling, which affects the winding effect of the battery cell.
[0004] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0005] In a first aspect, the utility model provides a pole piece structure, including a pole piece body, wherein the pole piece body has a single-sided coating area, at least one surface of the single-sided coating area is provided with a blank area, and a reinforcement is provided on the blank area.
[0006] Preferably, the length direction of the reinforcement member is perpendicular to the length direction of the pole piece body.
[0007] Preferably, the length of the reinforcement is F, and the width of the pole piece body is D, satisfying the relationship: F=cD, wherein c is 80% to 100%.
[0008] Preferably, the reinforcement member is a metal member.
[0009] Preferably, the single-sided coating area includes a first current collector and a first active material layer, a coating area is provided on one side of the first current collector, the first active material layer is provided on the coating area, and the blank area and the coating area are located on the same side and / or different side of the first current collector.
[0010] Preferably, along the length direction of the pole piece body, the pole piece body has a double-sided coating area connected to the single-sided coating area, the double-sided coating area includes a second current collector and a second active material layer arranged on both sides of the second current collector, the second current collector is connected to the first current collector, and the second active material layer on one side of the second current collector is connected to the first active material layer.
[0011] Preferably, when the blank area and the coated area are located on the same side of the first current collector, the distance between the first active material layer and the reinforcement is M; when the blank area and the coated area are located on different sides of the first current collector, the distance between the side of the first active material layer away from the second active material layer and the reinforcement is N, satisfying the relationship, M≤N.
[0012] Preferably, when the blank area and the coating area are located on different sides of the first current collector, a plurality of reinforcing members are provided, and the plurality of reinforcing members are arranged on the blank area at intervals along the length direction of the pole piece body.
[0013] In a second aspect, the utility model provides a battery, comprising the pole piece structure described in the first aspect.
[0014] In a third aspect, the utility model provides an electrical device, comprising the battery described in the second aspect.
[0015] Compared with the prior art, the beneficial effects achieved by the utility model are:
[0016] The pole piece structure of the utility model is provided with a reinforcing member on the blank area of the single-sided coating area. The reinforcing member can enhance the strength of the single-sided coating area and prevent the single-sided coating area from curling after rolling, thereby reducing the processing difficulty of subsequent processes of the pole piece structure, improving the winding effect of the battery cell, and improving the product quality rate.
[0017] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0018] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative labor.
[0019] Figure 1 It is a structural schematic diagram of the pole piece body of the utility model.
[0020] Figure 2 This is another structural schematic diagram of the pole piece body of the utility model.
[0021] Figure 3 It is another structural schematic diagram of the pole piece body of the utility model.
[0022] Figure 4 It is a top view of the pole piece body of the utility model.
[0023] Figure 5 It is a bottom view of the pole piece body of the utility model.
[0024] The reference numerals are described as follows:
[0025] 100. Pole piece body;
[0026] 10. single-sided coating area; 11. first current collector; 111. blank area; 112. coating area; 12. first active material layer;
[0027] 20. Reinforcement;
[0028] 30. double-sided coating area; 31. second current collector; 32. second active material layer;
[0029] a. The length direction of the reinforcement; b. The length direction of the pole piece body. DETAILED DESCRIPTION
[0030] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware 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. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.
[0031] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.
[0032] In the utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" 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 a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication 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.
[0033] The following will be combined with the attached Figures 1 to 5 The technical solutions in the embodiments of the utility model are clearly and completely described. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of them. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0034] The electrical equipment of the embodiment of the utility model includes a battery. The electrical equipment may be a car, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, and the like. The car may be a fuel car, a gas car, or a new energy car, and the new energy car may be a pure electric car, a hybrid car, or an extended-range car, and the like; the spacecraft includes an airplane, a rocket, a space shuttle, and a spacecraft, and the like; the electric toys include fixed or mobile electric toys, such as game consoles, electric car toys, electric ship toys, and electric airplane toys, and the like; the electric tools include metal cutting electric tools, grinding electric tools, assembly electric tools, and railway electric tools, such as electric drills, electric grinders, electric wrenches, electric screwdrivers, electric hammers, impact drills, concrete vibrators, and electric planers, and the like. The embodiment of the present application does not impose any special restrictions on the above-mentioned electrical equipment.
[0035] The battery of the embodiment of the utility model comprises a shell and a battery core, wherein the battery core is arranged in the shell.
[0036] Specifically, the battery cell includes two pole piece structures with opposite polarities and a separator disposed between the two pole piece structures, wherein one of the two pole piece structures is a positive pole piece and the other of the two pole piece structures is a negative pole piece.
[0037] It should be noted that the battery can be one or more. If there are multiple batteries, the multiple batteries can be connected in series, in parallel, or in mixed connection. Mixed connection means that multiple batteries are connected in series and in parallel. Multiple batteries can be directly connected in series, in parallel, or in mixed connection to form a whole; of course, multiple batteries can also be connected in series, in parallel, or in mixed connection to form a battery module, and multiple battery modules can then be connected in series, in parallel, or in mixed connection to form a whole.
[0038] See also Figures 1 to 5 The pole piece structure of the embodiment of the utility model includes a pole piece body 100, wherein the pole piece body 100 has a single-sided coating area 10, at least one surface of the single-sided coating area 10 is provided with a blank area 111, and a reinforcement member 20 is provided on the blank area 111.
[0039] Compared with the prior art, the pole piece structure of the embodiment of the utility model is provided with a reinforcement member 20 on the blank area 111 of the single-sided coating area 10. The reinforcement member 20 can enhance the strength of the single-sided coating area 10 and prevent the single-sided coating area 10 from curling after rolling, thereby reducing the processing difficulty of subsequent processes of the pole piece structure, improving the winding effect of the battery cell, and improving the product quality rate.
[0040] In some embodiments, the length direction a of the reinforcement 20 is perpendicular to the length direction b of the pole piece body 100. By setting the length direction a of the reinforcement 20, if the length direction a of the reinforcement 20 is parallel to the length direction b of the pole piece body 100, the reinforcement 20 occupies a larger area of the blank area 111 in the length direction b of the pole piece body 100, which is easy to affect the winding of the pole piece structure in the subsequent winding process. Therefore, the length direction a of the reinforcement 20 is perpendicular to the length direction b of the pole piece body 100, so that the reinforcement 20 occupies a larger area of the blank area 111 in the width direction of the pole piece body 100, which can not only avoid the curling of the single-sided coating area 10 after rolling, but also avoid affecting the winding of the pole piece structure in the subsequent winding process.
[0041] In some embodiments, the length of the reinforcement 20 is F, and the width of the pole piece body 100 is D, satisfying the relationship: F = cD, where c is 80% to 100%. By setting the length of the reinforcement 20, the length of the reinforcement 20 cannot be too large or too small. If the length of the reinforcement 20 is too small, the area occupied by the reinforcement 20 in the width direction of the pole piece body 100 is small, so that the reinforcement 20 has a small impact on the single-sided coating area 10, and the single-sided coating area 10 is prone to curling after rolling; if the length of the reinforcement 20 is too large, the length of the reinforcement 20 exceeds the width of the pole piece body 100. After the battery cell is prepared, the reinforcement 20 will occupy the space in the height direction of the battery cell, thereby affecting the energy density of the battery. Therefore, F = cD can not only avoid the curling of the single-sided coating area 10 after rolling, but also avoid occupying the space in the height direction of the battery cell.
[0042] In some embodiments, the thickness of the reinforcement 20 is 0.01 to 1 mm. By setting the thickness of the reinforcement 20, the thickness of the reinforcement 20 has a certain influence on the rigidity of the metal part. The thicker the thickness of the reinforcement 20, the greater the rigidity of the metal part, and the better the support effect of the metal part on the single-sided coating area 10. If the thickness of the reinforcement 20 is too thin, the rigidity of the metal part is poor, so that the support effect of the metal part on the single-sided coating area 10 is poor, and the single-sided coating area 10 is prone to curling after rolling; if the thickness of the reinforcement 20 is too thick, the rigidity of the metal part is strong, so that the metal part has a better support effect on the single-sided coating area 10, but it will affect the winding of the pole piece structure in the subsequent winding process.
[0043] Therefore, setting the thickness of the reinforcement member 20 to 0.01-1 mm can not only ensure the supporting effect of the metal member on the single-sided coating area 10, but also avoid affecting the winding of the pole piece structure in the subsequent winding process.
[0044] Further, the thickness of the reinforcement member 20 is 0.01-0.21 mm, 0.21-0.41 mm, 0.41-0.61 mm, 0.61-0.81 mm or 0.81-1 mm. Specifically, the thickness of the reinforcement member 20 is 0.01 mm, 0.1 mm, 0.2 mm, 0.3 mm, 0.4 mm, 0.5 mm, 0.6 mm, 0.7 mm, 0.8 mm, 0.9 mm or 1 mm, but is not limited to the listed values, and other values within the numerical range are also applicable.
[0045] In some embodiments, the width P of the reinforcement member 20 is 3 to 10 mm. By setting the width P of the reinforcement member 20, the wider the width P of the reinforcement member 20, the larger the area of the blank area 111 occupied by the metal member, and the better the support effect of the metal member on the single-sided coating area 10. Setting the width P of the reinforcement member 20 to 3 to 10 mm can not only ensure the support effect of the metal member on the single-sided coating area 10, but also avoid affecting the winding of the pole piece structure in the subsequent winding process.
[0046] Further, the width of the reinforcement member 20 is 3-4.4 mm, 4.4-5.8 mm, 5.8-7.2 mm, 7.2-8.6 mm or 8.6-10 mm. Specifically, the width of the reinforcement member 20 is 3 mm, 3.5 mm, 4 mm, 4.5 mm, 4.8 mm, 5 mm, 5.6 mm, 6 mm, 6.7 mm, 7 mm, 7.5 mm, 8 mm, 8.2 mm, 9 mm or 10 mm, but is not limited to the listed values, and other values within the numerical range are also applicable.
[0047] In some embodiments, the reinforcing member 20 is a metal member. The metal member has high strength and rigidity, and can effectively support the single-sided coated area 10 to prevent the single-sided coated area 10 from curling after rolling. In addition, the metal member has good corrosion resistance and is not easily corroded by chemical substances.
[0048] Furthermore, the metal piece can be arranged on the blank area 111 by welding. Specifically, the welding is resistance welding, ultrasonic welding or laser welding.
[0049] Furthermore, the metal piece can be made of the same material as the first current collector 11 and the second current collector 31. For example, when the electrode structure is a positive electrode, the first current collector 11, the second current collector 31 and the metal piece are all made of aluminum; when the electrode structure is a negative electrode, the first current collector 11, the second current collector 31 and the metal piece are all made of copper. Of course, the metal piece can also be made of a different material from the first current collector 11 and the second current collector 31, for example, the metal piece is made of nickel.
[0050] In some embodiments, the single-sided coating region 10 includes a first current collector 11 and a first active material layer 12, a coating region 112 is provided on one side of the first current collector 11, the first active material layer 12 is provided on the coating region 112, and the blank region 111 and the coating region 112 are located on the same side and / or on the opposite side of the first current collector 11. By setting the position of the blank region 111, the blank region 111 and the coating region 112 are located on the same side and / or on the opposite side of the first current collector 11, effectively increasing the position setting of the blank region 111, thereby increasing the position setting of the reinforcement 20, so that the reinforcement 20 can be set at a position selected according to actual needs.
[0051] In some embodiments, along the length direction b of the pole piece body 100, the pole piece body 100 has a double-sided coating area 30 connected to the single-sided coating area 10, the double-sided coating area 30 includes a second current collector 31 and a second active material layer 32 arranged on both sides of the second current collector 31, the second current collector 31 is connected to the first current collector 11, and the second active material layer 32 on one side of the second current collector 31 is connected to the first active material layer 12. By setting the double-sided coating area 30, that is, the second active material layer 32 is arranged on both sides of the second current collector 31, the energy density of the battery cell is effectively improved.
[0052] Specifically, the first current collector 11 and the second current collector 31 are an integrally formed structure, that is, the first current collector 11 and the second current collector 31 are one component.
[0053] In some embodiments, when the blank area 111 and the coated area 112 are located on the same side of the first current collector 11, the distance between the first active material layer 12 and the reinforcement 20 is M; when the blank area 111 and the coated area 112 are located on different sides of the first current collector 11, the distance between the side of the first active material layer 12 away from the second active material layer 32 and the reinforcement 20 is N, satisfying the relationship, M≤N.
[0054] Furthermore, M is 0 to 10 mm, and N is 0 to 20 mm.
[0055] In some embodiments, when the blank area 111 and the coated area 112 are located on opposite sides of the first current collector 11, a plurality of the reinforcement members 20 are provided, and the plurality of reinforcement members 20 are arranged at intervals on the blank area 111 along the length direction b of the pole piece body 100. By providing a plurality of reinforcement members 20, the support effect on the single-sided coated area 10 is effectively enhanced, and the bending of the single-sided coated area 10 is avoided. In addition, since a plurality of reinforcement members 20 are arranged at intervals on the blank area 111 along the length direction b of the pole piece body 100, not only can the support effect on the single-sided coated area 10 be enhanced, and the curling of the single-sided coated area 10 after rolling can be avoided, but also the winding affecting the pole piece structure in the subsequent winding process can be avoided.
[0056] Further, the width of the reinforcing member 20 is P, and the width of the single-sided coating area 10 is L, satisfying the relationship: nP≤mL, wherein n is the number of reinforcing members 20, and m is 30%.
[0057] The reinforcement member 20 of the present invention has at least the following configuration modes:
[0058] The first type: when the blank area 111 and the coated area 112 are located on the same side of the first current collector 11 , the reinforcement member 20 is disposed on the blank area 111 ;
[0059] The second type: when the blank area 111 and the coating area 112 are located on different sides of the first current collector 11 , the reinforcement member 20 is disposed on the blank area 111 ;
[0060] The third type is to have both of the above two ways of setting the reinforcing members 20, that is, the blank areas 111 on both sides of the first current collecting member are both provided with reinforcing members 20. In this case, M is 0-10 mm, N is 0-20 mm, and nP≤mL.
[0061] It is obvious to those skilled in the art that the present invention is not limited to the details of the exemplary embodiments described above, and that the present invention can be implemented in other specific forms without departing from the spirit or basic features of the present invention. Therefore, no matter from which point of view, the embodiments should be regarded as exemplary and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the above description, and it is intended that all changes falling within the meaning and scope of the equivalent elements of the claims are included in the present invention.
Claims
1. A pole piece structure, characterized in that: The invention comprises a pole piece body (100), wherein the pole piece body (100) has a single-sided coating area (10), at least one surface of the single-sided coating area (10) is provided with a blank area (111), and a reinforcing member (20) is provided on the blank area (111).
2. The pole piece structure according to claim 1, characterized in that: The length direction (a) of the reinforcement member (20) and the length direction (b) of the pole piece body (100) are perpendicular to each other.
3. The pole piece structure according to claim 1, characterized in that: The length of the reinforcement member (20) is F, and the width of the pole piece body (100) is D, satisfying the relationship: F=cD, wherein c is 80% to 100%.
4. The pole piece structure according to claim 1, characterized in that: The reinforcement member (20) is a metal member.
5. The pole piece structure according to any one of claims 1 to 4, characterized in that: The single-sided coating area (10) comprises a first current collector (11) and a first active material layer (12); a coating area (112) is provided on one side of the first current collector (11); the first active material layer (12) is provided on the coating area (112); and the blank area (111) and the coating area (112) are located on the same side and / or on different sides of the first current collector (11).
6. The pole piece structure according to claim 5, characterized in that: Along the length direction (b) of the pole piece body (100), the pole piece body (100) has a double-sided coating area (30) connected to the single-sided coating area (10), the double-sided coating area (30) includes a second current collector (31) and a second active material layer (32) arranged on both sides of the second current collector (31), the second current collector (31) is connected to the first current collector (11), and the second active material layer (32) on one side of the second current collector (31) is connected to the first active material layer (12).
7. The pole piece structure according to claim 6, characterized in that: When the blank area (111) and the coated area (112) are located on the same side of the first current collector (11), the distance between the first active material layer (12) and the reinforcement (20) is M; when the blank area (111) and the coated area (112) are located on different sides of the first current collector (11), the distance between the side of the first active material layer (12) away from the second active material layer (32) and the reinforcement (20) is N, satisfying the relationship, M≤N.
8. The pole piece structure according to claim 6, characterized in that: When the blank area (111) and the coated area (112) are located on different sides of the first current collector (11), a plurality of the reinforcement members (20) are provided, and the plurality of reinforcement members (20) are arranged on the blank area (111) at intervals along the length direction (b) of the pole piece body (100).
9. A battery, characterized in that: It comprises the pole piece structure as described in any one of claims 1 to 8.
10. An electrical equipment, characterized in that: A battery comprising the battery of claim 9.