Battery cell, battery and electric equipment
By setting a corner structure in the corner area of the battery cell, the problem of protecting glue increasing the battery cell size is solved, the stability and safety of the battery are achieved, and the energy density of the battery is maintained.
Patent Information
- Application Number
- CN202422398775.0
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-09-30
- Publication Date
- 2025-09-02
- Estimated Expiration
- 2034-09-30
AI Technical Summary
In the prior art, the protective glue of the battery increases the size of the battery cell, affects the flatness of the battery cell, and thus affects the energy density of the battery.
The first corner structure and the corresponding second corner structure are arranged in the corner area of the battery cell to reduce the space occupied by the battery cell in the aluminum-plastic film accommodating cavity, prevent sharp corners from punctured the aluminum-plastic film, and avoid the use of protective glue.
Effectively prevent battery cells from being bulging and leaking, ensuring battery stability and safety, while maintaining the flatness of the battery cells and reducing costs.
Smart Images
Figure CN223296923U_ABST
Abstract
Description
Technical Field
[0001] The utility model belongs to the technical field of batteries, and in particular relates to a battery cell, a battery and an electrical device. Background Art
[0002] As a new type of secondary battery, lithium-ion batteries have the advantages of high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and green environmental protection. They have broad application prospects in portable appliances, power tools, large-scale energy storage, electric transportation power supply, etc.
[0003] In existing technologies, the increasing demand for battery energy density has led to increasingly compact battery designs. Silicon anode technology, driven by its high capacity potential, has seen rapid development, but this has also come with significant volume expansion. However, after the battery cells undergo pressing, sharp corners easily form on their edges. Given the cell's expansion characteristics and the compact design of the battery structure, these corners are more likely to puncture the aluminum-plastic film. Once the aluminum layer is damaged, external moisture and humidity have the opportunity to penetrate the cell, causing serious problems such as bulging and leakage, severely impacting the battery's safety and service life.
[0004] Currently, to address this technical issue, protective adhesive is applied to the sides of battery cells. This adhesive wraps around sharp corners, softening their sharpness and effectively preventing them from piercing the aluminum-plastic film. However, this adhesive inevitably increases the thickness and width of the battery cells, affecting their flatness and, to a certain extent, the battery's energy density. Utility Model Content
[0005] The purpose of the present invention is to provide a battery cell, a battery and an electrical device to address the deficiencies of the prior art, and to solve the technical problem in the prior art that protective glue increases the size of the battery cell and thus affects the flatness of the battery cell.
[0006] In order to achieve the above purpose, the utility model adopts the following technical solutions:
[0007] In the first aspect, the utility model provides a battery cell, comprising a first electrode piece, a second electrode piece and a diaphragm, wherein the first electrode piece, the diaphragm and the second electrode piece are stacked and wound in sequence to form a battery cell, and the battery cell has a straight area and a corner area. At the outermost circle of the battery cell, the first electrode piece is located in the corner area of the battery cell and is provided with a first notched corner structure, and the second electrode piece is provided with a second notched corner structure corresponding to the position of the first notched corner structure.
[0008] Preferably, the first notch structure is provided in the corner region of at least one side of the battery cell.
[0009] Preferably, a finishing glue is provided on the outer surface of the battery cell. When the first notched corner structure is provided on one side of the battery cell, the finishing glue is provided in the corner area. A third notched corner structure is provided on the finishing glue, and the third notched corner structure corresponds to the position of the first notched corner structure.
[0010] Preferably, in the corner area on one side of the battery cell, two of the first notched corner structures and the second notched corner structures are provided, the two first notched corner structures are arranged opposite to each other along the length direction of the battery cell, and the two first notched corner structures and the two second notched corner structures are arranged in one-to-one correspondence.
[0011] Preferably, the shapes of the two first notch structures and / or the sizes of the two first notch structures are the same.
[0012] Preferably, the area of the first notch structure and / or the area of the second notch structure is 0.25 to 100 mm. 2 .
[0013] Preferably, the shape of the first notch structure and / or the shape of the second notch structure is rectangular, arc-shaped, triangular or arched.
[0014] Preferably, at the outermost circle of the battery cell, the diaphragm is provided with a fourth notch structure corresponding to the position of the first notch structure.
[0015] In a second aspect, the present invention provides a battery, comprising an aluminum-plastic film and a battery cell according to the above embodiment, wherein a receiving cavity is provided in the aluminum-plastic film, and the battery cell is provided in the receiving cavity.
[0016] In a third aspect, the present invention provides an electrical device comprising the battery of the above embodiment.
[0017] Compared with the prior art, the beneficial effects achieved by the present invention are:
[0018] The battery cell of the present invention, through the coordinated use of the first electrode piece, the second electrode piece, and the separator, has a flat region and a corner region. At the outermost circle of the battery cell, the first electrode piece is provided with a first notched corner structure in the corner region of the battery cell. This effectively makes the thickness and width of the battery cell located in the first notched corner structure smaller than the thickness and width of other regions of the battery cell. Consequently, after the battery cell is installed in the accommodating cavity of the aluminum-plastic film, the space occupied by the battery cell located in the first notched corner structure within the accommodating cavity is reduced, leaving a certain amount of space for the battery cell to expand. This effectively prevents the sharp corners of the battery cell from puncturing the aluminum-plastic film, preventing bulging and leakage of the battery cell, and ensuring the stability and safety of the battery. Furthermore, since there is no need to affix additional protective adhesive to the sides of the battery cell, the impact of the protective adhesive on the flatness of the battery cell is effectively avoided, effectively reducing costs. In addition, since the first electrode piece is located in the corner area of the battery cell and is provided with a first notch structure at the outermost circle of the battery cell, in order to ensure the embedding and extraction of lithium ions in the battery cell located in the first notch structure area, a second notch structure is provided in the area on the second electrode piece corresponding to the position of the first notch structure.
[0019] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS
[0020] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative labor.
[0021] Figure 1 This is a schematic structural diagram of the battery cell of the present utility model.
[0022] Figure 2 This is another structural schematic diagram of the battery cell of the present invention.
[0023] Figure 3 This is a schematic structural diagram of the pole piece stacking structure of the present invention.
[0024] Figure 4 This is one of the structural schematic diagrams of the first pole piece of the utility model.
[0025] Figure 5 This is the second structural diagram of the first pole piece of the utility model.
[0026] Figure 6 This is the third structural diagram of the first pole piece of the utility model.
[0027] Figure 7This is the fourth structural diagram of the first pole piece of the utility model.
[0028] Figure 8 This is a schematic structural diagram of the second pole piece of the utility model.
[0029] The description of the accompanying drawings is as follows:
[0030] 100, battery cell; 101, outermost ring; 102, corner area; 103, flat area;
[0031] 10. First pole piece; 11. First missing corner structure;
[0032] 20. Second pole piece; 21. Second notch structure;
[0033] 30. diaphragm; 31. fourth missing corner structure;
[0034] 40. Finishing glue; 41. Third missing corner structure;
[0035] a. The length direction of the battery cell. DETAILED DESCRIPTION
[0036] 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 the 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.
[0037] Furthermore, the terms “first,” “second,” etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.
[0038] In this utility model, unless otherwise expressly specified or limited, terms such as "installed," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connection, detachable connection, or integral connection; mechanical connection or electrical connection; direct connection or indirect connection through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of these terms in this utility model based on specific circumstances.
[0039] The following will be combined with the Figures 1 to 8The technical solutions in the embodiments of the present invention are clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, not all of them. All other embodiments derived by persons of ordinary skill in the art based on the embodiments of the present invention without creative effort are within the scope of protection of the present invention.
[0040] The electrical equipment of the embodiment of the present utility model includes a battery. The electrical equipment can 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 can be a fuel car, a gas car, or a new energy car. The new energy car can be a pure electric car, a hybrid car, or an extended-range car, and the like; the spacecraft includes airplanes, rockets, space shuttles, and 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.
[0041] The battery of the embodiment of the present invention includes an aluminum-plastic film and a battery cell 100 . A receiving cavity is provided in the aluminum-plastic film, and the battery cell 100 is provided in the receiving cavity.
[0042] See also Figures 1 to 8 The battery cell 100 of an embodiment of the present invention includes a first electrode piece 10, a second electrode piece 20 and a diaphragm 30. The first electrode piece 10, the diaphragm 30 and the second electrode piece 20 are stacked and wound in sequence to form the battery cell 100. The battery cell 100 has a straight area 103 and a corner area 102. In the outermost circle 101 of the battery cell 100, the first electrode piece 10 is located in the corner area 102 of the battery cell 100 and is provided with a first notched corner structure 11. The second electrode piece 20 is provided with a second notched corner structure 21 corresponding to the position of the first notched corner structure 11.
[0043] Compared with the prior art, the battery cell 100 of the embodiment of the present invention has a straight area 103 and a corner area 102 through the coordinated use of the first electrode piece 10, the second electrode piece 20 and the diaphragm 30. In the outermost circle 101 of the battery cell 100, the first electrode piece 10 is located in the corner area 102 of the battery cell 100 and is provided with a first notched corner structure 11, which effectively makes the thickness and width of the area of the battery cell 100 located in the first notched corner structure 11 smaller than the thickness and width of other areas of the battery cell 100. Therefore, after the battery cell 100 is loaded into the accommodating cavity of the aluminum-plastic film, the space occupied by the area of the battery cell 100 located in the first notched corner structure 11 in the accommodating cavity can be reduced, and a certain space is reserved for the expansion of the battery cell 100, thereby effectively preventing the sharp corners of the battery cell 100 from piercing the aluminum-plastic film, preventing the battery cell 100 from bulging and leaking, and ensuring the stability and safety of the battery. At the same time, since there is no need to affix additional protective adhesive to the sides of the battery cell 100, the impact of the protective adhesive on the flatness of the battery cell 100 is effectively avoided, effectively reducing costs. In addition, since the first electrode sheet 10 is provided with a first notched corner structure 11 at the corner region 102 of the battery cell 100 at the outermost circle 101 of the battery cell 100, in order to ensure the insertion and extraction of lithium ions in the region of the first notched corner structure 11 of the battery cell 100, a second notched corner structure 21 is provided on the second electrode sheet 20 in the region corresponding to the position of the first notched corner structure 11.
[0044] It can be understood that the polarities of the first electrode 10 and the second electrode 20 are opposite, one of the first electrode 10 and the second electrode 20 is a positive electrode, and the other of the first electrode 10 and the second electrode 20 is a negative electrode.
[0045] See also Figures 1-2 In some embodiments, the first notched corner structure 11 is provided in a corner region 102 on at least one side of the battery cell 100. By providing the first notched corner structure 11 in the corner region 102 on at least one side of the battery cell 100, the thickness and width of the corner region 102 on at least one side of the battery cell 100 are effectively made smaller than the thickness and width of other regions of the battery cell 100. Therefore, after the battery cell 100 is loaded into the accommodating cavity of the aluminum-plastic film, the space occupied by the region of the battery cell 100 located at the first notched corner structure 11 in the accommodating cavity can be reduced, reserving a certain amount of space for the expansion of the battery cell 100. This effectively prevents the sharp corners of the battery cell 100 from puncturing the aluminum-plastic film, thereby preventing bulging and leakage of the battery cell 100 and ensuring the stability and safety of the battery.
[0046] See also Figure 2 Furthermore, a finishing glue 40 is provided on the outer surface of the battery cell 100. By setting the finishing glue 40, the finishing glue 40 is provided on the outer surface of the battery cell 100, and the finishing glue 40 is used to fix the winding end of the battery cell 100, thereby ensuring that the battery cell 100 does not fall apart.
[0047] The finishing adhesive 40 is disposed in the corner region 102 and is provided with a third notched corner structure 41, which corresponds in position to the first notched corner structure 11. Due to the provision of the first notched corner structure 11 and the second notched corner structure 21, when the finishing adhesive 40 is adhered to the outer surface of the battery cell 100, the finishing adhesive 40 at the first notched corner structure 11 and the second notched corner structure 21 is prone to uneven adhesion. By providing the third notched corner structure 41 in the area of the finishing adhesive 40 corresponding to the position of the first notched corner structure 11, the smoothness of adhesion of the finishing adhesive 40 can be effectively improved.
[0048] It should be noted that the third notched structure 41 can extend to cover the edge of the first notched structure 11, effectively allowing the finishing glue 40 to wrap the burrs on the edge of the first notched structure 11, preventing the burrs from piercing the aluminum-plastic film and causing electrochemical corrosion with the aluminum layer of the aluminum-plastic film, thereby ensuring the stability and safety of the battery.
[0049] See also Figures 1 to 3 In some embodiments, two first notched corner structures 11 and two second notched corner structures 21 are provided in the corner region 102 on one side of the battery cell 100. The two first notched corner structures 11 are arranged opposite each other along the length direction a of the battery cell 100, and the two first notched corner structures 11 are arranged in a one-to-one correspondence with the two second notched corner structures 21. By providing two first notched corner structures 11 in the corner region 102 on one side of the battery cell 100, and the two first notched corner structures 11 are arranged corresponding to the two corners of the corner region 102 on one side of the battery cell 100, the corner area of the battery cell 100 can be fully protected, and the sharp corners of the battery cell 100 can be punctured to the greatest extent possible, thereby preventing the battery cell 100 from bulging and leaking, and ensuring the stability and safety of the battery.
[0050] In addition, the first notched corner structures 11 of the corner areas 102 of the battery cell 100 are each provided with a corresponding second notched corner structure 21, effectively ensuring the insertion and extraction of lithium ions in each corner area 102 of the battery cell 100, thereby improving the overall charge and discharge efficiency of the battery cell 100.
[0051] See also Figures 1-2 as well as Figures 4 to 8 Furthermore, the two first notched corner structures 11 have the same shape and / or size. Providing first notched corner structures 11 with the same shape and / or size standardizes the design of the first notched corner structures 11, simplifying the production process and improving production efficiency. Furthermore, during the manufacturing process, since the two first notched corner structures 11 are identical, manufacturing errors caused by different designs can be reduced, thereby improving product consistency and quality.
[0052] In some embodiments, the area of the first notch structure 11 and / or the area of the second notch structure 21 is 0.25 to 100 mm. 2 By setting the area of the first notch structure 11 and / or the area of the second notch structure 21, the area of the first notch structure 11 and / or the area of the second notch structure 21 cannot be too large or too small. When the area of the first notch structure 11 and / or the area of the second notch structure 21 is too small, that is, the area of the first notch structure 11 and / or the area of the second notch structure 21 is less than 0.25mm 2 When the area of the first notched corner structure 11 is too large, that is, the area of the first notched corner structure 11 and / or the area of the second notched corner structure 21 is greater than 100mm, the area of the first notched corner structure 11 and / or the area of the second notched corner structure 21 is too large, that is, the area of the first notched corner structure 11 and / or the area of the second notched corner structure 21 is greater than 100mm. 2 When the first notched corner structure 11 occupies more space on the first pole piece 10, and / or the second notched corner structure 21 occupies more space on the second pole piece 20, since the first pole piece 10 and the second pole piece 20 still have active material layers in the outermost circle 101 of the battery cell 100, the more area the first notched corner structure 11 and the second notched corner structure 21 occupy, the more active material needs to be removed, which in turn affects the energy density of the battery.
[0053] Therefore, the area of the first notch structure 11 and / or the area of the second notch structure 21 is 0.25-100 mm. 2 On the basis of ensuring the energy density of the battery, it can effectively prevent the sharp corners of the battery cell 100 from piercing the aluminum-plastic film, prevent the battery cell 100 from bulging and leaking, and ensure the stability and safety of the battery.
[0054] Furthermore, the area of the first notch structure 11 and / or the area of the second notch structure 21 is 0.25 mm 2 , 0.5mm 2 , 1mm 2 , 5mm 2 , 10mm 2 , 15mm 2 , 20mm 2 , 25mm 2 , 30mm 2 , 38mm 2 , 50mm 2 , 57mm 2 , 70mm 2 , 71mm 2 , 80mm 2 , 83mm2 , 90mm 2 , 98mm 2 or 100mm 2 , but are not limited to the listed values, and other values within the numerical range are also applicable.
[0055] See also Figures 4 to 8 In some embodiments, the shape of the first notched corner structure 11 and / or the second notched corner structure 21 is rectangular, arcuate, triangular, or arched. This effectively increases the shape options for the first notched corner structure 11 and / or the second notched corner structure 21, allowing the first notched corner structure 11 and / or the second notched corner structure 21 to be shaped to meet different needs.
[0056] See also Figures 1 to 3 In some embodiments, at the outermost circle 101 of the battery cell 100, the diaphragm 30 is provided with a fourth notched corner structure 31 corresponding to the position of the first notched corner structure 11. Since the first notched corner structure 11 is provided in the area corresponding to the first electrode piece 10 and the corner area 102 of the battery cell 100 at the outermost circle 101 of the battery cell 100, and the second notched corner structure 21 is provided in the area corresponding to the first notched corner structure 11 of the second electrode piece 20, at the outermost circle 101 of the battery cell 100, the corner area 102 of the battery cell 100 does not need to be separated from the second electrode piece 20 and the first electrode piece 10 by the diaphragm 30. Therefore, at the outermost circle 101 of the battery cell 100, the fourth notched corner structure 31 can be provided in the area corresponding to the first notched corner structure 11 of the diaphragm 30, making the design of the battery cell 100 more standardized and unified, which helps to simplify the manufacturing process and improve production efficiency.
[0057] It should be noted that, in the outermost circle 101 of the battery cell 100, the first electrode piece 10 cuts out the area corresponding to the corner area 102 of the battery cell 100 to form a first notch structure 11. The second electrode piece 20 cuts out the area corresponding to the first notch structure 11 to form a second notch structure 21. The diaphragm 30 cuts out the area corresponding to the first notch structure 11 to form a fourth notch structure 31. The finishing glue 40 cuts out the area corresponding to the first notch structure 11 to form a third notch structure 41.
[0058] Therefore, the first notched corner structure 11, the second notched corner structure 21, the third notched corner structure 41, and the fourth notched corner structure 31 referred to in the present invention are notched structures formed by cutting away specific areas in the material. That is, the first notched corner structure 11, the second notched corner structure 21, the third notched corner structure 41, and the fourth notched corner structure 31 are vacant portions formed in the material through a physical cutting process.
[0059] It will be apparent 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 essential features of the present invention. Therefore, the embodiments should be considered in all respects as illustrative and non-restrictive, and the scope of the present invention is defined by the appended claims rather than the foregoing description, and it is intended that all variations that come within the meaning and range of equivalents of the claims be embraced within the present invention.
Claims
1. A battery cell, characterized in that: The invention comprises a first pole piece (10), a second pole piece (20) and a diaphragm (30); the first pole piece (10), the diaphragm (30) and the second pole piece (20) are stacked and wound in sequence to form a battery cell (100); the battery cell (100) has a straight area (103) and a corner area (102); at the outermost circle (101) of the battery cell (100), the first pole piece (10) is located in the corner area (102) of the battery cell (100) and is provided with a first notched corner structure (11); and the second pole piece (20) is provided with a second notched corner structure (21) corresponding to the position of the first notched corner structure (11).
2. The battery cell according to claim 1, wherein: The first notched corner structure (11) is arranged in the corner area (102) on at least one side of the battery cell (100).
3. The battery cell according to claim 2, wherein: The outer surface of the battery cell (100) is provided with a finishing glue (40), the finishing glue (40) is provided in the corner area (102), and the finishing glue (40) has a third notched corner structure (41), and the third notched corner structure (41) corresponds in position to the first notched corner structure (11).
4. The battery cell according to claim 3, wherein: In the corner area (102) on one side of the battery cell (100), two first notch structures (11) and two second notch structures (21) are provided, the two first notch structures (11) are arranged opposite to each other along the length direction (a) of the battery cell (100), and the two first notch structures (11) and the two second notch structures (21) are arranged in a one-to-one correspondence.
5. The battery cell according to claim 4, wherein: The shapes of the two first notch structures (11) and / or the sizes of the two first notch structures (11) are the same.
6. The battery cell according to any one of claims 1 to 5, characterized in that: The area of the first notch structure (11) and / or the area of the second notch structure (21) is 0.25 to 100 mm 2 .
7. The battery cell according to any one of claims 1 to 5, wherein: The shape of the first notch structure (11) and / or the shape of the second notch structure (21) is rectangular, arc-shaped, triangular or arched.
8. The battery cell according to claim 1, wherein: In the outermost circle (101) of the battery cell (100), the diaphragm (30) is provided with a fourth notch structure (31) corresponding to the position of the first notch structure (11).
9. A battery, characterized in that: The invention comprises an aluminum-plastic film and the battery core according to any one of claims 1 to 8, wherein a receiving cavity is provided in the aluminum-plastic film, and the battery core (100) is provided in the receiving cavity.
10. An electrical device, characterized in that: A battery comprising the battery of claim 9.