Battery cell and battery
By covering the insulating parts at the corners of the electrode chip of the battery cell, the problem of piercing the diaphragm at the edges and corners of the electrode chip is solved, and the safety performance of the battery is improved.
Patent Information
- Application Number
- CN202421636050.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-10
- Publication Date
- 2025-06-17
- Estimated Expiration
- 2034-07-10
AI Technical Summary
During the battery cell processing, the sharp corner structure at the corners of the pole sheet is prone to pierce the diaphragm, resulting in battery cell safety problems.
A battery cell structure is designed, wherein the first electrode sheet, the diaphragm and the second electrode sheet are arranged in sequence, and the side surface of the first corner and/or the second corner is covered with an insulating member to protect the diaphragm.
By installing insulating components at the corners of the pole piece, the sharp corners pierce the diaphragm, reducing the safety risk of the pole piece corner burrs to the battery cell and improving the safety performance of the battery.
Smart Images
Figure CN222995767U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the technical field of batteries, in particular to an electrode core and a battery. Background Art
[0002] At present, during the processing of the electrode core, the electrode sheets of the electrode core are usually cut. However, due to the influence of processing accuracy, a sharp corner structure is inevitably generated during the cutting process. Furthermore, during the use of the electrode core, the sharp corner structure on the electrode sheet will pierce the separator, thereby causing safety problems for the electrode core. Summary of the Utility Model
[0003] In view of this, the purpose of the present utility model is to provide an electrode core and a battery to avoid the sharp corner structure at the edge of the electrode sheet from piercing the separator and causing safety problems for the electrode core.
[0004] Based on the above purpose, the present utility model provides an electrode core on the one hand, which includes a first electrode sheet, a separator, and a second electrode sheet stacked in sequence. Two adjacent edges of the first electrode sheet intersect to define a first corner, and two adjacent edges of the second electrode sheet intersect to define a second corner. The surface of the first corner and / or the second corner close to the separator is covered with an insulating component.
[0005] Optionally, two adjacent edges of the first electrode sheet intersect perpendicularly to define the first corner, and two adjacent edges of the second electrode sheet intersect perpendicularly to define the second corner. The orthographic projection of the insulating component on the separator completely covers the orthographic projections of the two sides of the first corner and / or the second corner on the separator.
[0006] Optionally, the first electrode sheet, the separator, and the second electrode sheet are stacked along a first direction. The cross-section of the insulating component in a first plane is square, rectangular, L-shaped, or triangular, and the first plane is perpendicular to the first direction.
[0007] Optionally, the first electrode sheet includes a first main body portion and a first tab extending outward from the first main body portion, and the second electrode sheet includes a second main body portion and a second tab extending outward from the second main body portion. The cross-sections of the first main body portion and the second main body portion in the first plane are both rectangular, the first corner and the second corner are the vertices of the rectangle, at least one insulating component is provided, and at least one insulating component only covers the first corner or the second corner.
[0008] Optionally, at least two of the insulating components are provided, and one of the insulating components covers each of two top corners along the length direction of the first pole piece or the second pole piece, or one of the insulating components covers each of two top corners along the width direction of the first pole piece or the second pole piece, or one of the insulating components covers each of two opposite top corners of the first pole piece or the second pole piece, or one of the insulating components covers each top corner of the first pole piece or the second pole piece.
[0009] Optionally, the first pole piece includes a first main body portion and a first tab extending outward from the first main body portion, the second pole piece includes a second main body portion and a second tab extending outward from the second main body portion, the cross-sections of the first main body portion and the second main body portion in the first plane are both rectangular, the first corner and the second corner are the top corners of the rectangle, and a plurality of the insulating components are provided, and the plurality of insulating components cover the first corner and the second corner respectively.
[0010] Optionally, one of the insulating components covers at least one top corner of the first pole piece, one of the insulating components covers at least one top corner of the second pole piece, and the orthographic projection of the insulating component covering the first pole piece on the separator does not overlap with the orthographic projection of the insulating component covering the second pole piece on the separator.
[0011] Optionally, one of the insulating components covers each top corner of the first pole piece and the second pole piece, and the orthographic projection of the insulating component covering the first pole piece on the separator at least partially coincides with the orthographic projection of the insulating component covering the second pole piece on the separator.
[0012] Optionally, the ratio of the size of the orthographic projection of the insulating component in the second direction to the length of the first pole piece or the second pole piece is 1 / 10 to 3 / 10, and the ratio of the size of the orthographic projection of the insulating component in the third direction to the width of the first pole piece or the second pole piece is 1 / 20 to 3 / 20, the second direction is the length direction of the first pole piece or the second pole piece, and the third direction is the width direction of the first pole piece or the second pole piece;
[0013] and / or the length and width of the insulating component are both 0.1 mm to 5 mm, and the thickness of the insulating component is 0.1 μm to 50 μm, and the thickness direction is perpendicular to the first pole piece or the second pole piece.
[0014] In a second aspect of the present application, a battery is provided, including the battery cell according to any one of the above first aspects.
[0015] As can be seen from the above, the battery cell provided by the present utility model includes a first electrode plate, a separator, and a second electrode plate stacked in sequence. Two adjacent edges of the first electrode plate intersect to define a first corner, and two adjacent edges of the second electrode plate intersect to define a second corner. An insulating component covers the surface of the first corner and / or the second corner close to the separator. By arranging the insulating component at the corner where two adjacent edges of the first electrode plate or the second electrode plate meet, the insulating component can be used to protect the separator, preventing the separator from being punctured by the tip structure generated during the processing of the first electrode plate and / or the second electrode plate, reducing the safety risk brought by the corner burrs of the electrode plate to the battery cell. At the same time, the arrangement of the insulating component can fully insulate the corner positions of the first electrode plate or the second electrode plate, preventing the electrode plate from expanding and piercing the separator to cause a short circuit, and further improving the safety performance of the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0016] In order to more clearly illustrate the technical solutions in the embodiments of the present utility model or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present utility model. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.
[0017] Figure 1 The front view of the first battery cell provided by the present utility model;
[0018] Figure 2 The first structural schematic diagram of the first electrode plate provided by the present utility model, wherein the cross-section of the insulating component in the first plane is a square;
[0019] Figure 3 The second structural schematic diagram of the first electrode plate provided by the present utility model, wherein the cross-section of the insulating component in the first plane is a rectangle;
[0020] Figure 4 The third structural schematic diagram of the first electrode plate provided by the present utility model, wherein the cross-section of the insulating component in the first plane is an L shape;
[0021] Figure 5 The fourth structural schematic diagram of the first electrode plate provided by the present utility model, wherein the cross-section of the insulating component in the first plane is a triangle;
[0022] Figure 6 The structural schematic diagram of the insulating component arranged along the length direction of the first electrode plate provided by the present utility model;
[0023] Figure 7 The structural schematic diagram of the insulating component arranged along the width direction of the first electrode plate provided by the present utility model;
[0024] Figure 8 Schematic diagram of the insulating component provided by the present utility model when it is located at the relative corners of the first pole piece;
[0025] Figure 9 Schematic diagram of the insulating component provided by the present utility model when it is located at the four corners of the first pole piece;
[0026] Figure 10 Front view of the second type of battery cell provided by the present utility model;
[0027] Figure 11 Front view of the third type of battery cell provided by the present utility model;
[0028] Figure 12 Schematic diagram of the first pole piece provided by the present utility model before being cut, where X is the width of the first pole piece;
[0029] Figure 13 Schematic diagram of the second pole piece provided by the present utility model before being cut, where Y is the width of the second pole piece.
[0030] In the figure:
[0031] 1. First pole piece; 11. First main body part; 12. First pole ear; 13. First corner; 2. Second pole piece; 21. Second main body part; 22. Second pole ear; 23. Second corner; 3. Insulating component;
[0032] 100. Diaphragm. Detailed implementation manners
[0033] To make the objectives, technical solutions and advantages of the present utility model clearer and more understandable, the following further elaborates on the present utility model in detail with reference to specific embodiments and the accompanying drawings.
[0034] It should be noted that unless otherwise defined, the technical terms or scientific terms used in the embodiments of the present utility model should have the ordinary meanings understood by those with ordinary skills in the field to which this disclosure belongs. The "first", "second" and similar terms used in this disclosure do not indicate any order, quantity or importance, but are only used to distinguish different components. The terms such as "including" or "comprising" mean that the elements or objects appearing before this word cover the elements or objects listed after this word and their equivalents, without excluding other elements or objects. The terms such as "connected" or "coupled" are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The terms such as "upper", "lower", "left", "right" are only used to represent relative positional relationships, and when the absolute position of the object being described changes, the relative positional relationship may also change accordingly.
[0035] During the production process of battery cell electrodes, the positive and negative electrodes of the battery cells need to be cut. Due to the influence of processing precision, the cutting process will inevitably produce sharp corners or burrs at the corners of the electrodes. These sharp corners or burrs will pierce the diaphragm, causing direct contact between the positive and negative electrodes, resulting in a short circuit, and then causing safety problems.
[0036] Currently, metal cutters or lasers are generally used to manually cut the V-angle at the corner of the pole piece to eliminate the sharp corners at the pole piece as much as possible, but cutting the V-angle will generate new burrs. Therefore, even if there is a V-angle, during the use of the battery, the burrs at the V-angle of the positive and negative pole pieces may pierce the diaphragm due to stress caused by the expansion of the pole piece, causing safety problems.
[0037] Therefore, it is necessary to propose a battery cell that can avoid sharp corners or burrs at the corners of the electrode from piercing the diaphragm.
[0038] Based on this, the present application provides a battery cell. Figure 1 A front view of the first type of battery cell is shown, see Figure 1 The battery cell includes a first pole piece 1, a diaphragm 100 and a second pole piece 2 stacked in sequence, two adjacent edges of the first pole piece 1 intersect to define a first corner 13, two adjacent edges of the second pole piece 2 intersect to define a second corner 23, and a surface of one side of the first corner 13 and / or the second corner 23 close to the diaphragm 100 is covered with an insulating component 3.
[0039] Specifically, two adjacent edges of the first pole piece 1 intersect to define a first corner 13, and there may be multiple first corners 13. Two adjacent edges of the second pole piece 2 intersect to define a second corner 23, and there may be multiple second corners 23.
[0040] The surface of one side of the first corner 13 and / or the second corner 23 close to the diaphragm 100 is covered with the insulating component 3. The insulating component 3 may be covered only on part or all of the surface of the first corner 13, or only on part or all of the surface of the second corner 23, or both part or all of the surface of the first corner 13 and the surface of the second corner 23 may be covered with the insulating component 3.
[0041] The insulating component 3 may be made of an insulating material. For example, the insulating component 3 may be an insulating tape or an insulating coating.
[0042] One side surface of the first corner 13 and / or the second corner 23 close to the separator 100 is covered with an insulating member 3. Thus, the insulating member 3 is located between the first corner 13 and / or the second corner 23 and the separator 100, acting as a protective member therebetween, ensuring that the sharp corners or burrs of the first corner 13 and / or the second corner 23 will not pierce the separator 100, and improving the safety performance of the battery. At the same time, the arrangement of the insulating member 3 can fully insulate the edge positions of the first electrode sheet 1 or the second electrode sheet 2, preventing the electrode sheet from expanding and piercing the separator 100 to cause a short circuit, and further improving the safety performance of the battery.
[0043] In some embodiments, referring still to Figure 1 , two adjacent edges of the first electrode sheet 1 intersect perpendicularly to define a first corner 13, and two adjacent edges of the second electrode sheet 2 intersect perpendicularly to define a second corner 23. The orthographic projection of the insulating member 3 on the separator 100 completely covers the orthographic projections of the two edges of the first corner 13 and / or the second corner 23 on the separator 100.
[0044] Specifically, two adjacent edges of the first electrode sheet 1 intersect perpendicularly to define a right-angled first corner 13, and two adjacent edges of the second electrode sheet 2 intersect perpendicularly to define a right-angled second corner 23. The sharp corners of the right-angled first corner 13 and the second corner 23 are very obvious and are extremely likely to pierce the separator 100.
[0045] Therefore, in this application, one side of the first corner 13 and / or the second corner 23 close to the separator 100 is covered with the insulating member 3, and the orthographic projection of the insulating member 3 on the separator 100 completely covers the orthographic projections of the two edges of the first corner 13 and / or the second corner 23 on the separator 100. Thus, it is ensured that the sharp corners of the first corner 13 and the second corner 23 and the burrs on the two right-angled sides can be covered by the insulating member 3, thereby playing a role in protecting the separator 100, ensuring that these sharp corners and the burrs on the two right-angled sides will not directly contact the separator 100, and thus will not pierce the separator 100, improving the safety of the separator 100 and the battery.
[0046] In addition, in this application, there is no need to cut a V-notch at the corners of the first electrode sheet 1 and the second electrode sheet 2. It is only necessary to cover the insulating member 3 at the corners, simplifying the operation process and at the same time improving the safety performance of the battery.
[0047] In some embodiments, referring still to Figure 1 , the first electrode sheet 1, the separator 100, and the second electrode sheet 2 are stacked along a first direction (i.e., Figure 1 the thickness direction in ), and the cross-section of the insulating member 3 in a first plane is square, rectangular, L-shaped, or triangular. The first plane is perpendicular to the first direction. It should be noted that the above first direction is defined as the thickness direction of the first electrode sheet 1 or the second electrode sheet 2, and the first plane is the plane where the separator 100 is located.
[0048] Figure 2 Shows a first schematic structural diagram of the first pole piece 1, wherein the cross-section of the insulating member 3 on the first plane is square.
[0049] Figure 3 Shows a second schematic structural diagram of the first pole piece 1, wherein the cross-section of the insulating member 3 on the first plane is rectangular.
[0050] Figure 4 Shows a third schematic structural diagram of the first pole piece 1, wherein the cross-section of the insulating member 3 on the first plane is L-shaped.
[0051] Figure 5 Shows a fourth schematic structural diagram of the first pole piece 1, wherein the cross-section of the insulating member 3 on the first plane is triangular.
[0052] Since most of the existing pole pieces are square structures, that is, the main shape of the pole piece is square or rectangular. At this time, referring to Figure 2 and Figure 3 , the shape of the insulating member 3 can be correspondingly configured as square or rectangular, so as to achieve the purpose of covering the corners of the pole piece. In addition, referring to Figure 4 , the insulating part can also be set as an L-shaped structure, and the corners of the L-shaped structure are correspondingly arranged with the corners of the pole piece to achieve the purpose of covering the corners of the pole piece. Compared with the insulating member 3 of the above square or rectangular structure, the L-shaped structure further reduces the manufacturing cost on the basis of ensuring that the separator 100 is not punctured by the corners of the pole piece.
[0053] In addition, the insulating member 3 can be replaced with a right-angled triangle. Referring to Figure 5 , the two right-angled sides of the right-angled triangle respectively cover the edges of the corners of the pole piece. It should be noted that the right-angled triangle in this embodiment is an isosceles right-angled triangle, and the two right-angled sides of the isosceles right-angled triangle respectively coincide with the two edges of the corner of the pole piece, so as to achieve the protection of the separator 100. In other embodiments, the corners of the isosceles right-angled triangle can also be arranged outside the pole piece, as long as the orthographic projection of the insulating member 3 on the separator 100 can cover the corners of the pole piece, which is not specifically limited here.
[0054] The present application does not limit the cross-sectional shape of the insulating member 3, which is set according to actual needs, as long as the orthographic projection of the insulating member 3 on the separator 100 completely covers the orthographic projections of the two sides of the first corner 13 and / or the second corner 23 on the separator 100 to ensure the protection effect on the separator 100.
[0055] In some embodiments, continue to refer to Figures 1 to 5, the first electrode tab 1 includes a first main body portion 11 and a first tab 12 extending outward from the first main body portion 11, the second electrode tab 2 includes a second main body portion 21 and a second tab 22 extending outward from the second main body portion 21. The cross-sections of the first main body portion 11 and the second main body portion 21 in the first plane are both rectangular. The first corner 13 and the second corner 23 are the top corners of the rectangle. At least one insulating member 3 is provided, and at least one insulating member 3 only covers the first corner 13 or the second corner 23.
[0056] Specifically, in actual implementation, at least one insulating member 3 is covered on the corner with more burrs among the first corner 13 or the second corner 23, so as to reduce the influence of the corner burrs or sharp corners on the separator 100 as much as possible, and play a role in protecting the separator 100.
[0057] Figure 6 The structural schematic diagram of the insulating member 3 arranged along the length direction of the first electrode tab 1 is shown; Figure 7 The structural schematic diagram of the insulating member 3 arranged along the width direction of the first electrode tab 1 is shown; Figure 8 The structural schematic diagram of the insulating member 3 located at the opposite corners of the first electrode tab 1 is shown; Figure 9 The structural schematic diagram of the insulating member 3 located at the four corners of the first electrode tab 1 is shown.
[0058] In some embodiments, in order to improve the safety of the separator 100, at least two insulating members 3 may be provided. Refer to Figure 1 and Figure 6 , one insulating member 3 is respectively covered at the two top corners in the length direction of the first electrode tab 1 or the second electrode tab 2, or, refer to Figure 1 and Figure 7 , one insulating member 3 is respectively covered at the two top corners in the width direction of the first electrode tab 1 or the second electrode tab 2, or, refer to Figure 1 and Figure 8 , one insulating member 3 is respectively covered at the two opposite top corners of the first electrode tab 1 or the second electrode tab 2, or, refer to Figure 1 and Figure 9 , one insulating member 3 is covered at each top corner of the first electrode tab 1 or the second electrode tab 2.
[0059] In this way, at least two insulating members 3 are covered on the corner with more burrs or more obvious sharp corners among the first corner 13 or the second corner 23, so as to reduce the influence of the corner burrs or sharp corners on the separator 100 as much as possible, and play a role in protecting the separator 100.
[0060] In the actual application process, the appropriate installation position of the insulating member 3 can be selected according to actual needs, so as to minimize the number of insulating members 3 on the premise of protecting the separator 100 and save the manufacturing cost.
[0061] In some embodiments, the cross-sections of the first main body portion 11 and the second main body portion 21 on the first plane are both rectangles, the first corner 13 and the second corner 23 are the top corners of the rectangle, and a plurality of insulating components 3 are provided. The plurality of insulating components 3 respectively cover the first corner 13 and the second corner 23.
[0062] Specifically, the plurality of insulating components 3 respectively cover the first corner 13 and the second corner 23. In this way, the insulating components 3 can cover the corners with more burrs or more obvious sharp corners in the first corner 13 and the second corner 23, so as to reduce the influence of the corner burrs or sharp corners on the separator 100 as much as possible and play a protective role for the separator 100.
[0063] Figure 10 The front view of the second type of battery cell is shown. Refer to Figure 10 , in some embodiments, at least one top corner of the first electrode tab 1 is covered with an insulating component 3, at least one top corner of the second electrode tab 2 is covered with an insulating component 3, and the orthographic projection of the insulating component 3 covering the first electrode tab 1 on the separator 100 does not overlap with the orthographic projection of the insulating component 3 covering the second electrode tab 2 on the separator 100.
[0064] Specifically, since the orthographic projection of the insulating component 3 on the first electrode tab 1 on the separator 100 does not overlap with the orthographic projection of the insulating component 3 on the second electrode tab 2 on the separator 100 on the separator 100, it can ensure that the positions of the separator 100 corresponding to each corner are protected, further ensuring the safety of the separator 100.
[0065] Figure 11 The front view of the third type of battery cell is shown. In some embodiments, in order to further protect the safety of the separator 100, refer to Figure 11 , at each top corner of the first electrode tab 1 and the second electrode tab 2, an insulating component 3 is covered, and the orthographic projection of the insulating component 3 covering the first electrode tab 1 on the separator 100 at least partially overlaps with the orthographic projection of the insulating component 3 covering the second electrode tab 2 on the separator 100.
[0066] Specifically, the orthographic projection of the insulating component 3 covering the first electrode tab 1 on the separator 100 at least partially overlaps with the orthographic projection of the insulating component 3 covering the second electrode tab 2 on the separator 100. It can be that as shown in Figure 11 , the projection parts partially overlap and partially do not overlap; it can also be that as shown in Figure 1 , the projections completely overlap. Whether it is partial overlap or complete overlap, there are insulating components 3 on both sides of the separator 100, that is, the insulating components 3 protect the separator 100 from both sides, ensuring that the separator 100 will not be punctured and further improving the safety of the separator 100. It should be noted that since the edge of the insulating component 3 will extend beyond the edge of the electrode tab, as shown in Figure 11As shown, the length edge of the insulating component 3 located on the first pole piece 1 extends beyond the length edge of the first pole piece 1. Among them, the above structure may be caused by processing errors during preparation or may be artificially set. At this time, in order to ensure that the insulating component 3 is in contact with the separator 100, the width of the separator 100 can be made greater than that of the first pole piece 1 and the second pole piece 2, so that the positive projection of the separator 100 on the first plane completely covers the positive projection of the insulating component 3 on the first plane.
[0067] Furthermore, when the positive projection of the insulating component 3 covering the first pole piece 1 on the separator 100 and the positive projection of the insulating component 3 covering the second pole piece 2 on the separator 100 do not partially overlap, it can be as Figure 11 shown that the insulating component 3 of the first pole piece 1 extends beyond the first pole piece 1 by a part in the width direction, while the insulating component 3 of the second pole piece 2 completely coincides with the second pole piece 2 in the width direction of the second pole piece 2, ensuring that both sides of the separator 100 at the corner of the pole piece can be protected by the insulating component 3, and at the same time, there is no strict limitation on the size of the insulating component 3, which can reduce the process difficulty of manufacturing the insulating component 3.
[0068] In some embodiments, the ratio of the size of the positive projection of the insulating component 3 in the second direction to the length of the first pole piece 1 or the second pole piece 2 is 1 / 10 to 3 / 10, and the ratio of the size of the positive projection of the insulating component 3 in the third direction to the width of the first pole piece 1 or the second pole piece 2 is 1 / 20 to 3 / 20, where the second direction is the length direction of the first pole piece 1 or the second pole piece 2, and the third direction is the width direction of the first pole piece 1 or the second pole piece 2.
[0069] Exemplarily, the ratio of the size of the positive projection of the insulating component 3 in the second direction to the length of the first pole piece 1 or the second pole piece 2 is 1 / 10, 1 / 5, 1 / 4, 3 / 10, etc., which is not specifically limited here; the ratio of the size of the positive projection of the insulating component 3 in the third direction to the width of the first pole piece 1 or the second pole piece 2 is 1 / 20, 1 / 15, 1 / 10, 3 / 20, etc., which is not specifically limited here and is set according to actual needs.
[0070] Optionally, both the length and width of the insulating component 3 are 0.1 mm to 5 mm, and the thickness of the insulating component 3 is 0.1 μm to 50 μm, where the thickness direction is perpendicular to the first pole piece 1 or the second pole piece 2.
[0071] Exemplarily, the length and width of the insulating component 3 can be 1 mm, 2 mm, 3 mm, 4 mm, etc., which is not specifically limited here; the thickness of the insulating component 3 is 10 μm, 20 μm, 30 μm, 40 μm, etc., which is not specifically limited here.
[0072] Figure 12Shows the structural schematic diagram of the first electrode tab 1 before cutting. Here, X is the width of the first electrode tab 1; Figure 13 Shows the structural schematic diagram of the second electrode tab 2 before cutting. Here, Y is the width of the second electrode tab 2. Refer to Figure 12 and Figure 13 , before cutting, an insulating component 3 can cover two adjacent corners of two adjacent electrode tabs, so that the process of manufacturing the insulating component 3 can be simplified.
[0073] The first electrode tab 12 and the second electrode tab 22 of the above-mentioned battery cell are arranged in a staggered manner, and their relative positions can be on the same side or on the opposite side. Specifically, two electrode tabs arranged in the same direction can ensure more convenient connection between the battery cell and the outside world, and two electrode tabs arranged in the opposite direction can prevent the first electrode tab 12 and the second electrode tab 22 from contacting each other, preventing short circuit inside the battery cell, thereby ensuring the safety inside the battery cell.
[0074] Furthermore, the structure of the above-mentioned battery cell is that the separator 100, the first electrode tab 1, the separator 100, the second electrode tab 2, the separator 100... the first electrode tab 1, the separator 100 are arranged in a cycle. Here, the number of layers of the first electrode tab 1, the second electrode tab 2 and the separator 100 is set according to the manufacturing parameters of the battery cell, and no specific limitation is made here.
[0075] Furthermore, since the battery cell includes a plurality of first electrode tabs 1, separators 100 and second electrode tabs 2 stacked, the above-mentioned insulating component 3 can be provided only on one side of the first electrode tab 1 and the second electrode tab 2, or can be provided correspondingly on both the front and back sides to ensure that the separators 100 in contact with the front and back sides of the electrode tabs are not punctured by the corners of the electrode tabs.
[0076] In this embodiment, the above-mentioned first electrode tab 1 can be a positive electrode tab, and the second electrode tab 2 can be a negative electrode tab. It can be understood that the first electrode tab 12 is a positive electrode ear, and the second electrode tab 22 is a negative electrode ear. Here, the positive electrode active material of the positive electrode tab can be one or several of lithium-rich phase materials such as lithium iron phosphate, lithium cobaltate, lithium nickel cobalt manganate, lithium manganate, or lithium nickel cobalt aluminate; the negative electrode active material of the negative electrode tab can be one or several of materials such as carbon-based, silicon-based, alloy-based, and lithium titanate.
[0077] In this embodiment, the above-mentioned separator 100 can adopt a substrate structure, or a substrate stacked with a coating layer structure. Here, the material of the substrate can be a single-layer polyethylene (PE) film, a single-layer polypropylene (PP) film, or a polypropylene-polyethylene-polypropylene three-layer composite film, and the material of the coating layer can be at least one of porous silica, aluminum oxide, titanium dioxide, and zirconium dioxide.
[0078] In this embodiment, the above-mentioned insulating component 3 is an insulating tape. Among them, the insulating tape can be a PET tape, a PI tape or an OPP tape. In other embodiments, the above-mentioned insulating component 3 can also be an insulating coating. Among them, the material of the insulating coating can be at least one of porous silica, aluminum oxide, titanium dioxide, zirconium dioxide, PVDF (polyvinylidene fluoride), PMMA (methyl acrylate and its copolymers), CMC (carboxymethyl cellulose), PAA (homopolymer of acrylic acid), PI (polyimide), and PO (polyolefin copolymer).
[0079] On the other hand, this embodiment provides a battery, including the battery cell of any of the above embodiments. Specifically, the electrolyte in the above battery electrolyte is an organic solvent electrolyte, a polymer electrolyte, a gel electrolyte or an all-solid-state electrolyte; the outer shell of the battery is made of materials such as an aluminum shell, a steel shell, a plastic shell or an aluminum plastic film.
[0080] Those of ordinary skill in the art should understand that the discussion of any of the above embodiments is only exemplary and is not intended to imply that the scope of the present disclosure (including the claims) is limited to these examples; under the concept of the present invention, the technical features in the above embodiments or different embodiments can also be combined, and the steps can be implemented in any order, and there are many other variations in different aspects of the present invention as described above, and they are not provided in detail for the sake of brevity.
[0081] The embodiments of the present invention are intended to cover all such substitutions, modifications and variations that fall within the broad scope of the appended claims. Therefore, any omissions, modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.
Claims
1. A battery cell, characterized in that: It includes a first pole piece, a diaphragm and a second pole piece stacked in sequence, two adjacent edges of the first pole piece intersect to define a first corner, two adjacent edges of the second pole piece intersect to define a second corner, and the surface of one side of the first corner and / or the second corner close to the diaphragm is covered with an insulating component.
2. The battery cell according to claim 1, characterized in that: Two adjacent edges of the first pole piece intersect perpendicularly to define the first corner, two adjacent edges of the second pole piece intersect perpendicularly to define the second corner, and the orthographic projection of the insulating component on the diaphragm completely covers the orthographic projection of the two sides of the first corner and / or the second corner on the diaphragm.
3. The battery cell according to claim 2, characterized in that: The first pole piece, the diaphragm and the second pole piece are stacked along a first direction, the cross section of the insulating component on a first plane is square, rectangular, L-shaped or triangular, and the first plane is perpendicular to the first direction.
4. The battery cell according to claim 3, characterized in that: The first pole piece includes a first main body and a first pole ear extending outward from the first main body, the second pole piece includes a second main body and a second pole ear extending outward from the second main body, the cross-sections of the first main body and the second main body on the first plane are both rectangular, the first corner and the second corner are the vertices of the rectangle, and at least one insulating component is provided, and at least one insulating component only covers the first corner or the second corner.
5. The battery cell according to claim 4, characterized in that: There are at least two insulating components, and two vertex corners along the length direction of the first pole piece or the second pole piece are respectively covered with one of the insulating components, or two vertex corners along the width direction of the first pole piece or the second pole piece are respectively covered with one of the insulating components, or two opposite vertex corners of the first pole piece or the second pole piece are respectively covered with one of the insulating components, or each vertex corner of the first pole piece or the second pole piece is covered with one of the insulating components.
6. The battery cell according to claim 3, characterized in that: The first pole piece includes a first main body and a first pole ear extending outward from the first main body, the second pole piece includes a second main body and a second pole ear extending outward from the second main body, the cross-sections of the first main body and the second main body on the first plane are both rectangular, the first corner and the second corner are the top corners of the rectangle, and there are multiple insulating components, and the multiple insulating components cover the first corner and the second corner respectively.
7. The battery cell according to claim 6, characterized in that: At least one vertex corner of the first pole piece is covered with the insulating component, and at least one vertex corner of the second pole piece is covered with the insulating component, and the orthographic projection of the insulating component covered on the first pole piece on the diaphragm has no overlap with the orthographic projection of the insulating component covered on the second pole piece on the diaphragm.
8. The battery cell according to claim 6, characterized in that: Each vertex of the first pole piece and the second pole piece is covered with an insulating component, and the orthographic projection of the insulating component covered on the first pole piece on the diaphragm at least partially overlaps with the orthographic projection of the insulating component covered on the second pole piece on the diaphragm.
9. The battery cell according to any one of claims 1 to 8, characterized in that: The ratio of the size of the orthographic projection of the insulating component in the second direction to the length of the first pole piece or the second pole piece is 1 / 10 to 3 / 10, and the ratio of the size of the orthographic projection of the insulating component in the third direction to the width of the first pole piece or the second pole piece is 1 / 20 to 3 / 20, the second direction is the length direction of the first pole piece or the second pole piece, and the third direction is the width direction of the first pole piece or the second pole piece; And / or the length and width of the insulating component are both 0.1 mm to 5 mm, the thickness of the insulating component is 0.1 μm to 50 μm, and the thickness direction is perpendicular to the first pole piece or the second pole piece.
10. A battery, characterized in that: Comprising the battery cell as described in any one of claims 1 to 9.