Battery cell and battery
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG LIWINON ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-06-09
- Publication Date
- 2026-07-14
Smart Images
Figure CN224502258U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, specifically to a battery cell and a battery. Background Technology
[0002] In battery manufacturing technology, to better utilize the internal space of the battery and improve energy density, one current approach is to thin the PP layer at the junction of the aluminum-plastic film and the cell body, while retaining the thickness of the PP layer at the sealing edge. This aims to increase energy density while ensuring battery sealing. However, thinning the PP layer leads to the expansion of ion channels inside the cell. Consequently, the negative electrode tab connected to the cell body can more easily conduct electricity through the aluminum foil layer of the aluminum-plastic film to the outermost cathode plate of the cell body, increasing the risk of short circuits and compromising battery safety. Utility Model Content
[0003] This application aims to address at least one of the technical problems existing in the prior art. To this end, this application proposes a battery cell that can effectively reduce the risk of short circuits and improve battery safety.
[0004] This application also proposes a battery having the above-mentioned cells.
[0005] According to an embodiment of this application, the battery cell includes an aluminum-plastic film, which includes a connected main body and an edge portion. The edge portion is distributed on the outer periphery of the main body. Along the thickness direction of the aluminum-plastic film, a heat-sealing layer is provided on the inner side of both the main body and the edge portion. The thickness of a single heat-sealing layer in the main body is T1, and the thickness of a single heat-sealing layer in the edge portion is T2, and T1 is less than T2. The battery cell also includes a battery cell body and a tab.
[0006] The main body encloses a receiving cavity, the main body of the battery cell is located in the receiving cavity, the edge includes a top sealing edge, one end of the electrode tab is connected to the main body of the battery cell, the other end of the electrode tab extends from the side where the top sealing edge is located to the outside of the receiving cavity, and part of the electrode tab is exposed outside the top sealing edge;
[0007] The top sealing edge is covered with a first adhesive seal on the side away from the main body, and / or the edge is provided with a chamfer structure, which includes a chamfered edge, and the chamfered edge is arranged at an angle to the side of the top sealing edge away from the main body.
[0008] The battery cell according to the embodiments of this application has at least the following beneficial effects: The thinner heat-sealing layer within the main body allows the main body to enclose a larger receiving cavity without changing the cell volume, facilitating the accommodating of a larger cell body and thus increasing the cell's energy density. Simultaneously, the thicker heat-sealing layer within the edge ensures good sealing of the receiving cavity during heat-sealing, guaranteeing the cell's airtightness. The first encapsulation portion covers the cross-section of the top seal edge to limit the conduction between the electrode tab and the top seal edge cross-section, and / or the chamfered structure improves the impact resistance of the cell corners to ensure cell integrity, thereby reducing the short-circuit risk associated with the thinner heat-sealing layer within the main body and improving battery safety.
[0009] According to some embodiments of this application, the edge portion further includes a side sealing edge, which is connected to the top sealing edge;
[0010] The connection between the side sealing edge and the top sealing edge is provided with a chamfered structure, and / or, the end of the side sealing edge away from the top sealing edge is provided with a chamfered structure.
[0011] According to some embodiments of this application, the edge portion further includes a bending portion, an adhesive portion, and a substrate. The bending portion is connected to the substrate. Along the thickness direction of the battery cell, one side of the adhesive portion is bonded to the bending portion, and the other side of the adhesive portion is bonded to the substrate. The bending portion is configured to bend relative to the substrate around the chamfered edge to form a chamfered structure.
[0012] According to some embodiments of this application, the distance between the adhesive portion and the top sealing edge on the side opposite to the main body portion is 0 to 0.1 mm;
[0013] And / or, the distance between the adhesive portion and the side seal on the side away from the main body is 0 to 0.1 mm.
[0014] According to some embodiments of this application, the battery cell further includes a second encapsulation portion, which covers the chamfered edge.
[0015] According to some embodiments of this application, K The value of K ranges from 0.05 to 0.6;
[0016] Wherein, the length of the top sealing edge is L1, the weight W1 of the first sealing part is 3.2KL1mg to 4.8KL1mg, and / or, along the width direction of the cell, the width of the chamfered edge is L2, and the included angle is... The weight W2 of the second sealant is mg to mg.
[0017] According to some embodiments of this application, the width of the first adhesive sealant portion is 0.2 mm to 0.6 mm;
[0018] And / or, the width of the second sealant portion is 0.2 mm to 0.6 mm.
[0019] According to some embodiments of this application, the chamfered edge includes a chamfered end near the main body of the battery cell, and the distance between the chamfered end and the main body of the battery cell is [missing information]. , mm.
[0020] According to some embodiments of this application, the included angle is... ,and .
[0021] The battery according to the embodiments of this application includes the battery cell in any of the above embodiments.
[0022] The battery according to the embodiments of this application has at least the following beneficial effects: the battery composed of the above-mentioned cells is safer and more reliable while having a higher energy density.
[0023] Additional aspects and advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of this application. Attached Figure Description
[0024] The present application will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0025] Figure 1 This is a schematic diagram showing the unfolded aluminum-plastic film according to an embodiment of this application;
[0026] Figure 2 This is a schematic diagram of the structure of the battery cell according to the first embodiment of this application;
[0027] Figure 3 This is a schematic diagram of the structure of the top sealing edge and the first adhesive sealing part of this application;
[0028] Figure 4 This is a schematic diagram of the battery cell structure according to the second embodiment of this application;
[0029] Figure 5 for Figure 4 A magnified view of a section at point A in the middle;
[0030] Figure 6 This is a schematic diagram of the structure of the third embodiment of this application;
[0031] Figure 7 for Figure 6 A magnified view of a section at point B in the middle.
[0032] Reference numerals: Cell body 110, tab 120, positive tab 121, negative tab 122, first sealant 130, second sealant 140;
[0033] 200 aluminum-plastic film, 210 heat-sealing layer, 220 aluminum foil layer, 230 nylon layer, 240 main body, 250 edge, 251 top sealing edge, 252 side sealing edge, 253 chamfer structure, 2531 chamfer bevel, 254 bending part, 255 adhesive part, 256 substrate, 260 receiving cavity. Detailed Implementation
[0034] The embodiments of this application are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain this application, and should not be construed as limiting this application.
[0035] In the description of this application, it should be understood that the orientation descriptions, such as up, down, front, back, left, right, etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this application.
[0036] In the description of this application, "several" means one or more, "multiple" means two or more, "greater than," "less than," and "exceeding" are understood to exclude the stated number, while "above," "below," and "within" are understood to include the stated number. The use of "first" and "second" in the description is merely for distinguishing technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.
[0037] In the description of this application, unless otherwise expressly defined, terms such as "setup," "installation," and "connection" should be interpreted broadly, and those skilled in the art can reasonably determine the specific meaning of the above terms in this application in conjunction with the specific content of the technical solution.
[0038] In the description of this application, the terms "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., refer to specific features, structures, materials, or characteristics described in connection with that embodiment or example, which are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.
[0039] The embodiments of this application are described below with reference to the accompanying drawings:
[0040] refer to Figures 1 to 3According to an embodiment of this application, the battery cell includes a battery cell body 110, a tab 120, and an aluminum-plastic film 200. The aluminum-plastic film 200 includes a connected main body portion 240 and an edge portion 250. Along the thickness direction of the aluminum-plastic film 200, a heat-sealing layer 210 is provided on the inner side of both the main body portion 240 and the edge portion 250. The edge portion 250 is distributed on the outer periphery of the main body portion 240. The main body portion 240 encloses a receiving cavity 260. The battery cell body 110 is located in the receiving cavity 260. The main body portion 240 can at least close one side of the receiving cavity 260. The edge portion 250 includes a top sealing edge 251. One end of the tab 120 is connected to the cell body 110, and the other end of the tab 120 extends from the side where the top sealing edge 251 is located to the outside of the receiving cavity 260, with a portion of the tab 120 exposed outside the top sealing edge 251. Based on this, the heat-sealing layer 210 in the main body portion 240 is thinner than the heat-sealing layer 210 in the edge portion 250. On the one hand, this allows the main body portion 240 to enclose a larger receiving cavity 260 to accommodate a larger cell body 110 while maintaining the same cell volume, which is beneficial for improving the energy density of the cell. On the other hand, during heat fusion sealing, the thicker heat-sealing layer 210 in the edge portion 250 can ensure the heat fusion sealing effect of the edge portion 250, thereby ensuring the airtightness of the cell. In addition, the first sealing part 130 covers the cross section of the top sealing edge 251 and covers the exposed aluminum foil layer 220 at the cross section of the top sealing edge 251 to prevent the tab 120 from conducting with the exposed aluminum foil layer 220 at the cross section of the top sealing edge 251, thereby effectively reducing the risk of short circuit in the battery cell and making the battery cell safer.
[0041] And / or, the edge portion 250 is also provided with a chamfer structure 253, which includes a chamfered edge 2531. The chamfered edge 2531 and the top sealing edge 251 are arranged at an angle to the side away from the main body portion 240. The chamfer structure 253 can improve the impact resistance of the cell corner, thereby helping to ensure the integrity of the cell and the integrity of the cell structure under external impact, which in turn helps to ensure the safety of the battery.
[0042] refer to Figures 1 to 3Specifically, along the thickness direction of the aluminum-plastic film 200, the aluminum-plastic film 200 includes a nylon layer 230, an aluminum foil layer 220, and a heat-sealing layer 210 arranged in sequence. The two aluminum-plastic films 200 are bonded together by the two heat-sealing layers 210 when heated, thereby sealing the receiving cavity 260. When the aluminum-plastic film 200 encapsulates the battery cell body 110, the aluminum-plastic film 200 is folded into two layers and remains connected on the folded side. Thus, along the thickness direction of the battery cell, both the main body 240 and the edge portion 250 include double-layer aluminum-plastic films 200. The double-layer aluminum-plastic films 200 in the main body 240 enclose the receiving cavity 260. One side of the main body 240 is folded, and the edge portion 250 surrounds the other three sides of the main body 240. Within the main body 240, the heat-sealing layer 210 is located on the side of the aluminum foil layer 220 closest to the cell body 110 (i.e., the inner side of the main body 240). The heat-sealing layer 210 within the main body 240 can prevent the cell body 110 from contacting the aluminum foil layer 220 and short-circuiting. Within the edge portion 250, the heat-sealing layer 210 is located on the opposite side of the two aluminum-plastic films 200 (i.e., the inner side of the edge portion 250).
[0043] In addition, the main body 240 and the edge portion 250 are an integral structure. The edge portion 250 includes a top sealing edge 251 and two side sealing edges 252. Along the length direction of the battery cell, the top sealing edge 251 is located on the opposite side of the folded side of the main body 240. Along the width direction of the battery cell, one end of the top sealing edge 251 is connected to one side sealing edge 252, and the other end of the top sealing edge 251 is connected to the other side sealing edge 252. The two side sealing edges 252 are arranged at intervals, so that the edge portion 250 is distributed around the outer periphery of the main body 240 on three sides. The tab 120 extends out of the receiving cavity 260 from the side where the top sealing edge 251 is located, and is partially exposed outside the top sealing edge 251. The tab 120 includes a positive tab 121 and a negative tab 122. Since the cell body 110 is a cathode sheet outer structure, there is a risk of short circuit due to the cathode sheet conducting through the aluminum foil layer 220 and the negative tab 122. Therefore, it is necessary to restrict the negative tab 122 from conducting through the aluminum foil layer 220 and the cathode sheet. In this application, the first seal portion 130 is used to cover the side of the top seal edge 251 away from the body portion 240 to block the aluminum foil layer 220 exposed at the cross section of the top seal edge 251 from conducting through the negative tab 122. Thus, the negative tab 122 is restricted from conducting through the aluminum foil layer 220 and the cathode sheet, which effectively reduces the risk of short circuit in the cell and is beneficial to improving the safety of the battery.
[0044] refer to Figure 4 and Figure 5 The chamfered structure 253 can be formed by cutting off the corner along the chamfered edge 2531 or by bending the corner along the chamfered edge 2531. The chamfered structure 253 can effectively improve the stress concentration at the corner of the battery cell, thereby enhancing the overall structural strength of the battery cell.
[0045] It should be noted that, Figure 1The diagram shows the intermediate state of the aluminum-plastic film 200 of this application. In this step, the aluminum-plastic film 200 with recesses (receiving cavities 260) is formed by cutting and stamping. At the same time, the upper and lower sides of the aluminum-plastic film 200 are "sealed with adhesive". Then, the aluminum-plastic film 200 is folded around the dotted line on the upper side, so that the upper and lower edges are aligned, forming a shape as shown in the diagram. Figure 3 The shown is a cross-sectional view of the edge sealing.
[0046] The thinner heat-sealing layer 210 inside the main body 240 is achieved by thinning the heat-sealing layer 210 by laser ablation based on the current thickness of the heat-sealing layer 210, rather than by thickening the heat-sealing layer 210 inside the edge portion 250. Therefore, if the aluminum-plastic film 200 is laid flat, the heat-sealing layer 210 of the aluminum-plastic film 200 can form a groove structure, and the area distributed in the main body 240 is where the groove is located.
[0047] In addition, the value of T2 can range from 30μm to 50μm, and the ratio of T1 to T2 can range from 1 to 40.
[0048] refer to Figure 4 and Figure 5 In some embodiments, the edge portion 250 further includes a side sealing edge 252 connected to the top sealing edge 251. The side sealing edge 252 and the top sealing edge 251 are used to jointly seal the receiving cavity 260. The edge portion 250 is also provided with a chamfer structure 253, which includes a chamfered bevel 2531. The chamfered bevel 2531 and the side of the top sealing edge 251 away from the main body portion 240 are arranged at an angle. The chamfer structure 253 is provided at the connection between the side sealing edge 252 and the top sealing edge 251, and / or the end of the side sealing edge 252 away from the top sealing edge 251 is provided with the chamfer structure 253. That is, the chamfer structure 253 is arranged at the corner of the battery cell, and at least one corner of the battery cell is provided with the chamfer structure 253. The chamfer structure 253 is used to disperse the external force on the corner of the battery cell, making it more difficult for the corner of the battery cell to deform when the battery cell is subjected to impact, thereby improving the impact resistance of the battery cell.
[0049] Specifically, the corners of the battery cell include the connection between the side sealing edge 252 and the top sealing edge 251, and also include the end of the side sealing edge 252 facing away from the top sealing edge 251, so that the battery cell has four corners, at least one of which is a chamfered structure 253. Taking the chamfered structure 253 located at the connection between the top sealing edge 251 and the side sealing edge 252 as an example, the chamfered structure 253 includes a chamfered bevel 2531, which is located on the side of the chamfered structure 253 facing away from the main body 240. The chamfered structure 253 can be formed by cutting off a part of the edge portion 250, and the cut-off part is a right-angled triangle. The chamfered bevel 2531 is the bevel of the cut-off right-angled triangle. The chamfered edge 2531 and the top sealing edge 251 are arranged at an angle along their length. One end of the chamfered edge 2531 is connected to one end of the top sealing edge 251, and the angle between the extension lines of the chamfered edge 2531 and the top sealing edge 251 is an acute angle. The chamfered structure 253 effectively reduces the sharpness of the corners of the battery cell, making the corner transition of the battery cell smoother. This allows the battery cell to maintain its original structure more effectively when subjected to impact, resulting in more stable battery performance.
[0050] refer to Figure 1 and Figure 7 In some embodiments, the edge portion 250 further includes a side sealing edge 252 connected to the top sealing edge 251. The edge portion 250 also includes a bending portion 254, an adhesive portion 255, and a substrate 256. The bending portion 254 is connected to the substrate 256. Along the thickness direction of the battery cell, one side of the adhesive portion 255 is bonded to the bending portion 254, and the opposite side of the adhesive portion 255 is bonded to the substrate 256. The bending portion 254 is configured to bend around the chamfered edge 2531 relative to the substrate 256 to form a chamfered structure 253. The chamfered edge 2531 and the side of the top sealing edge 251 away from the main body portion 240 are arranged at an angle. Thus, while forming the chamfered structure 253, the edge portion 250 of the aluminum-plastic film 200 can be locally thickened. The structure at the chamfered structure 253 is more stable and can further resist the impact resistance of the chamfered structure 253, which is beneficial to further improve the safety of the battery cell.
[0051] The side sealing edge 252 and the top sealing edge 251 are provided with a chamfer structure 253, and / or the side sealing edge 252 away from the top sealing edge 251 is provided with a chamfer structure 253. That is, the chamfer structure 253 is arranged at the corner of the battery cell, and there can be one, two, three or four chamfer structures 253.
[0052] Specifically, the bent portion 254 is triangular and is connected to the substrate 256. The crease between the two is where the chamfered edge 2531 is located. The adhesive portion 255 is used to bond the bent portion 254 and the substrate 256 to maintain the structural stability of the chamfered structure 253. The adhesive portion 255 can be hot melt adhesive, which can be cured after cooling. No curing equipment is required, making the operation simple and the cost low. Correspondingly, when dispensing adhesive, the amount of adhesive can be controlled as needed, which can effectively prevent adhesive overflow while ensuring that the bent portion 254 remains bent.
[0053] refer to Figure 6 and Figure 7 In some embodiments, the distance between the adhesive portion 255 and the top sealing edge 251 on the side opposite to the main body portion 240 is 0 to 0.1 mm;
[0054] And / or, the distance between the adhesive portion 255 and the side sealing edge 252 on the side away from the main body portion 240 is 0 to 0.1 mm. For example, in this embodiment, the two distances can be any value among 0 mm (the edge of the adhesive portion 255 is flush with the edge of the top sealing edge 251, or the edge of the adhesive portion 255 is flush with the edge of the side sealing edge 252), 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, or 0.1 mm, or a range of values where any two values from 0 mm, 0.02 mm, 0.04 mm, 0.06 mm, 0.08 mm, and 0.1 mm are used as endpoint values.
[0055] Specifically, after the hot melt adhesive is cured, an adhesive portion 255 is formed. The distribution area of the adhesive portion 255 does not extend beyond the edge of the top sealing edge 251, nor does it extend beyond the edge of the side sealing edge 252. In other words, along the thickness direction of the battery cell, the bent portion 254 covers the adhesive portion 255. The bent portion 254, the adhesive portion 255, and the substrate 256 are stacked to form a chamfered structure 253.
[0056] refer to Figures 3 to 7 In some embodiments, the battery cell further includes a second encapsulation portion 140, which covers the chamfered edge 2531 to cover the exposed aluminum foil layer 220 at the cross-section of the chamfered edge 2531, preventing the battery cell from being squeezed and deformed, which would cause the chamfered edge 2531 to contact the tab 120. In addition, the second encapsulation portion 140 can also improve the sealing performance at the chamfered edge 2531. Thus, the chamfered structure 253 reduces the space occupied by the battery cell while also ensuring the sealing performance and safety of the battery cell.
[0057] It should be noted that the first sealing part 130 and the second sealing part 140 in this application can be achieved by a dispensing process. For example, UV adhesive (Ultraviolet Curing Adhesive) can be used for dispensing, and after dispensing, it can be placed in an ultraviolet environment for curing, so that the adhesive can quickly change from liquid to solid, thereby achieving the bonding or sealing of the first sealing part 130.
[0058] refer to Figures 1 to 3 In some embodiments, K The value of K ranges from 0.05 to 0.6. For example, the value of K can be 0.05, 0.1, 0.2, 0.3, 0.4, 0.5, or 0.6. The length of the top sealing edge 251 is L1, and the weight W1 of the first adhesive sealing part 130 is 3.2KL1mg to 4.8KL1mg. In the above formula, By relating the weight of the first encapsulation part 130 to the length of the top sealing edge 251 and the thinning ratio of the heat sealing layer 210 inside the main body 240, the amount of adhesive dripped into the first encapsulation part 130 can be more accurately controlled. This ensures that the first encapsulation part 130 can completely cover the side of the top sealing edge 251 away from the main body 240, while avoiding adhesive overflow. This makes the size of the battery cell more accurate and facilitates subsequent assembly processes.
[0059] And / or, see reference Figures 1 to 5 Along the width direction of the battery cell, the width of the chamfered hypotenuse 2531 is L2, and the included angle is... The weight W2 of the second sealant part 140 is mg to mg, where the length of the chamfered hypotenuse 2531 is L3. = Similarly, by limiting the amount of adhesive dripped onto the chamfered edge 2531, on the one hand, it can ensure both the coverage and sealing of the chamfered edge 2531, and on the other hand, it can prevent excessive adhesive overflow at the chamfered edge 2531, making the battery cell safer and the dimensions more accurate.
[0060] It should be noted that the above L1, T1, T2 and Different models of battery cells may have different parameters. Based on the changes in the above parameters, the amount of glue applied when making the first encapsulation part 130 and / or the second encapsulation part 140 can be adaptively adjusted to better balance the sealing and covering effect of the first encapsulation part 130 and / or the second encapsulation part 140, and to make the specific size of the battery cell closer to the preset size, so as to facilitate the subsequent assembly of the battery cell with other battery cells or electronic devices.
[0061] For example, the thickness of the aluminum-plastic film 200 is 115μm, the thickness of the heat-sealing layer 210 is 43μm, and the width of the battery cell is 66mm.
[0062]
[0063] In addition, when the chamfered structure 253 is formed by cutting, the following specific embodiment is provided:
[0064]
[0065] When the chamfered structure 253 is formed by bending, the following specific embodiment is provided. In this case, the adhesive part 255 is used to bond and fix the bent part 254, and the amount of glue dripped is not directly related to the K value.
[0066]
[0067] It should be noted that the above K value and dispensing amount are approximate values, and deviations are allowed in the actual production process.
[0068] refer to Figures 1 to 3 In some embodiments, the width of the first encapsulation portion 130 is 0.2mm to 0.6mm. The lower limit of the width of the first encapsulation portion 130 is defined to ensure that the first encapsulation portion 130 covers the side of the top sealing edge 251 away from the main body portion 240, so as to fully prevent the negative electrode tab 122 from contacting the cross section of the top sealing edge 251 and causing a short circuit. The upper limit of the width of the first encapsulation portion 130 is defined to facilitate maintaining the size of the battery cell, thereby making subsequent assembly more convenient.
[0069] The width of the first adhesive sealing part 130 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm or 0.6mm, or it can be a range of any two values among 0.2mm, 0.3mm, 0.4mm, 0.5mm and 0.6mm as endpoint values.
[0070] And / or, see reference Figures 3 to 5 The width of the second sealant portion 140 is 0.2mm to 0.6mm. Similarly, the width of the second sealant portion 140 can be 0.2mm, 0.3mm, 0.4mm, 0.5mm, or 0.6mm, or it can be a range of any two values among 0.2mm, 0.3mm, 0.4mm, 0.5mm, and 0.6mm as endpoint values. Limiting the lower limit of the width of the second sealant portion 140 ensures that the second sealant portion 140 covers the chamfered edge 2531, improving sealing performance while reducing the risk of short circuits. Limiting the upper limit of the width of the second sealant portion 140 ensures that the second sealant portion 140 covers the cross-section of the chamfered edge 2531 and also avoids dimensional deviations caused by adhesive overflow.
[0071] Specifically, a portion of the first sealing portion 130 and / or the second sealing portion 140 extends beyond the edge of the edge portion 250. Taking the first sealing portion 130 as an example, the width direction of the first sealing portion 130 is the length direction of the battery cell. A portion of the first sealing portion 130 covers the top sealing edge 251, forming a structure stacked along the thickness direction of the battery cell. Another portion of the first sealing portion 130 extends beyond the edge of the top sealing edge 251 (see reference). Figure 3 The top sealing edge 251 is covered on the side of the body 240, which is away from the cross section, to prevent the exposed aluminum-plastic layer at the cross section of the top sealing edge 251 from contacting the negative electrode tab 122, thus effectively reducing the risk of short circuit.
[0072] refer to Figures 1 to 5 In some embodiments, the chamfered edge 2531 includes a chamfered end near the cell body, the chamfered end being spaced apart from the cell body by a distance of [missing information]. , mm defines the distance from the chamfered end to the main body of the cell. This is used to balance the cell's sealing performance and the size of the chamfered structure, allowing the cell to maintain its sealing performance while increasing the overall size of the chamfered structure, which is beneficial for improving the impact resistance of the cell's corners.
[0073] in The value can be 0, 0.1mm, 0.2mm, 0.3mm, 0.4mm, or 0.5mm, or... The value can also be any of the values among 0, 0.1mm, 0.2mm, 0.3mm, 0.4mm and 0.5mm as the range of endpoint values.
[0074] It should be noted that since the chamfer structure 253 is located at the corner of the battery cell, when the distance between the chamfer end and the battery cell body 110 is 0, it should be understood that the distance between the chamfer end and the battery cell body 110 is 0 along the width direction of the battery cell, or the distance between the chamfer end and the battery cell body 110 is 0 along the length direction of the battery cell, so as to ensure the sealing of the edge portion 250 to the receiving cavity 260, rather than the distance between the chamfer end and the battery cell body 110 being 0 along both the width and length directions of the battery cell.
[0075] refer to Figure 4 and Figure 5 In some embodiments, the included angle in any of the above embodiments is ,and ,For example, The value can be 30°, 35°, 40°, 45°, 50°, 55°, or 60°, or... The value can also be a range of values where any two values from 30°, 35°, 40°, 45°, 50°, 55°, and 60° are used as endpoints, thus limiting the range. The lower limit of the value can prevent the angle between the chamfered edge 2531 and the top sealing edge 251 on the side away from the main body 240 from being too sharp or blunt, thereby ensuring the impact resistance of the chamfered structure 253.
[0076] refer to Figures 1 to 7 The battery according to the embodiments of this application includes the battery cells in any of the above embodiments, wherein the number of battery cells can be multiple, and the battery cells are connected in series or in parallel. In addition, the battery may also include a battery casing, a protection circuit and other structures. The protection circuit is connected to the battery cells and has functions such as overcharge / over-discharge protection, short circuit protection and temperature protection. Each battery cell is installed in the battery casing.
[0077] The embodiments of this application have been described in detail above with reference to the accompanying drawings. However, this application is not limited to the above embodiments. Within the scope of knowledge possessed by those skilled in the art, various changes can be made without departing from the spirit of this application. Furthermore, unless otherwise specified, the embodiments and features described in the embodiments of this application can be combined with each other.
Claims
1. A battery cell, comprising an aluminum-plastic film, the aluminum-plastic film comprising a connected main body portion and an edge portion, the edge portion being distributed at the outer periphery of the main body portion, and a heat-sealing layer being provided on the inner side of both the main body portion and the edge portion along the thickness direction of the aluminum-plastic film, wherein the thickness of a single heat-sealing layer in the main body portion is T1, and the thickness of a single heat-sealing layer in the edge portion is T2, and T1 is less than T2, characterized in that... include: Battery cell body and electrode tabs; The main body encloses a receiving cavity, the battery cell body is located in the receiving cavity, the edge portion includes a top sealing edge, one end of the electrode tab is connected to the battery cell body, the other end of the electrode tab extends from the side where the top sealing edge is located to the outside of the receiving cavity, and part of the electrode tab is exposed outside the top sealing edge; The top sealing edge is covered with a first adhesive seal on the side away from the main body, and / or the edge portion is further provided with a chamfer structure, the chamfer structure including a chamfered edge, the chamfered edge being arranged at an angle to the side of the top sealing edge away from the main body.
2. The battery cell according to claim 1, characterized in that, The edge portion also includes a side sealing edge, which is connected to the top sealing edge; Wherein, the chamfered structure is provided at the connection between the side sealing edge and the top sealing edge, and / or, the chamfered structure is provided at the end of the side sealing edge away from the top sealing edge.
3. The battery cell according to claim 2, characterized in that, The edge portion further includes a bending portion, an adhesive portion, and a substrate. The bending portion is connected to the substrate. Along the thickness direction of the battery cell, one side of the adhesive portion is bonded to the bending portion, and the opposite side of the adhesive portion is bonded to the substrate. The bending portion is configured to bend relative to the substrate around the chamfered edge to form the chamfered structure.
4. The battery cell according to claim 3, characterized in that, The distance between the adhesive portion and the top sealing edge on the side opposite to the main body portion is 0 to 0.1 mm; And / or, the distance between the adhesive portion and the side sealing edge on the side away from the main body portion is 0 to 0.1 mm.
5. The battery cell according to claim 1, characterized in that, The battery cell also includes a second encapsulation portion, which covers the chamfered edge.
6. The battery cell according to claim 5, characterized in that, K The value of K ranges from 0.05 to 0.6; Wherein, the length of the top sealing edge is L1, the weight W1 of the first adhesive seal is 3.2KL1mg to 4.8KL1mg, and / or, along the width direction of the battery cell, the width of the chamfered side is L2, and the included angle is... The weight W2 of the second sealant is mg to mg.
7. The battery cell according to claim 5, characterized in that, The width of the first adhesive sealant portion is 0.2 mm to 0.6 mm; And / or, the width of the second sealant portion is 0.2 mm to 0.6 mm.
8. The battery cell according to claim 1, characterized in that, The chamfered edge includes a chamfered end near the main body of the battery cell, and the chamfered end is spaced apart from the main body of the battery cell. , mm.
9. The battery cell according to claim 1, characterized in that, The included angle is ,and .
10. A battery, characterized in that, include: The battery cell according to any one of claims 1 to 9.