Battery cell, battery, and electric device

Abstract

The application provides an electric core, which comprises an electrode assembly and a shell, the electrode assembly comprises a tab, and the electrode assembly is arranged in the shell, the shell comprises an encapsulation part and a sealing part connected with the encapsulation part, the sealing part is formed by the encapsulation part extending outward, the electrode assembly is located in the encapsulation part, the tab penetrates outward from the sealing part, the encapsulation part comprises a side wall, a notch is arranged on the sealing part, the notch is formed by the outer periphery of the sealing part being recessed to the connection part of the sealing part and the encapsulation part, and the sealing part is attached to the side wall. The application also relates to a battery and an electric device, by adopting the above electric core, the area of the sealing part of the shell can be reduced, and the problem of space waste of the sealing part can be avoided.

Description

[0001] Cross-references to related applications This application is a divisional application of application number 202180002842.9, filed on January 21, 2021, entitled "Battery Cell, Battery and Electrical Device". Technical Field

[0002] This application relates to the field of battery manufacturing technology, and in particular to a battery cell, a battery, and an electrical device. Background Technology

[0003] Existing smart wearable devices use batteries for power, and these batteries are commonly packaged in metal casings. However, excessive weight can reduce user satisfaction. To address this issue, existing technologies use soft-pack batteries as an alternative. Soft-pack batteries reduce overall weight and cost. However, because the sealing area of ​​the packaging film is perpendicular to the curved side of the battery cell cylinder, the outermost circumference of the circumference of the sealed area after bending is larger than the circumference of the main body of the battery cell, thus forming wavy wrinkles, such as... Figure 1 As shown, the wavy folds waste space on the cell's surface. Summary of the Invention

[0004] In view of this, it is necessary to provide a cell, battery and power device that can solve the problem of a wavy appearance at the sealing part.

[0005] An embodiment of this application provides a battery cell, including an electrode assembly and a housing. The electrode assembly includes tabs and is disposed within the housing. The housing includes an encapsulation portion and a sealing portion connected to the encapsulation portion. The sealing portion extends outward from the encapsulation portion. The electrode assembly is located within the encapsulation portion. The tabs protrude outward from the sealing portion. The encapsulation portion includes a sidewall. A slot is formed on the sealing portion. The slot is formed by recessing from the outer periphery of the sealing portion towards the connection between the sealing portion and the encapsulation portion. The sealing portion is attached to the sidewall.

[0006] In one possible implementation, the cell further includes an insulating sheet disposed between the electrode assembly and the housing.

[0007] In one possible implementation, the housing includes a first encapsulation film and a second encapsulation film. The first encapsulation film includes a first portion and a first edge portion connected to the first portion. The second encapsulation film includes a second portion and a second edge portion connected to the second portion. The first portion and the second portion surround the encapsulation portion, and the first edge portion and the second edge portion are connected to form the sealing portion.

[0008] In one possible implementation, the first portion is recessed to form a first receiving cavity, the vertical cross-section of the first receiving cavity being inverted U-shaped; the second portion is flat and closes the first portion to form the encapsulation portion.

[0009] In one possible implementation, the first portion is recessed to form a first receiving cavity, the vertical cross-section of the first receiving cavity being inverted U-shaped; the second portion is recessed to form a second receiving cavity, the vertical cross-section of the second receiving cavity being U-shaped; the first receiving cavity and the second receiving cavity surround the encapsulation portion.

[0010] In one possible implementation, the slot is at least one of arc-shaped, V-shaped, semi-circular, U-shaped, or polygonal.

[0011] In one possible implementation, the minimum distance between the edge of the slot and the connection between the encapsulation portion and the sealing portion is greater than or equal to 0.5 mm.

[0012] In one possible implementation, the encapsulation portion includes a first end face and a second end face opposite to the first end face, the first end face and the second end face are respectively connected to the sidewall, and the distance from the connection point of the sealing portion and the encapsulation portion to the first end face is greater than or equal to the distance from the connection point to the second end face.

[0013] In one possible implementation, the battery cell further includes a first adhesive member, one end of which is disposed on the side wall, the first end face, or the second end face, and the other end of which is disposed on the surface of the sealing portion facing away from the encapsulation portion, for fixing the sealing portion to the encapsulation portion.

[0014] In one possible implementation, the battery cell further includes a second adhesive member disposed between the sidewall and the surface of the sealing portion near the encapsulation portion, for fixing the sealing portion to the encapsulation portion.

[0015] Embodiments of this application also provide a battery, including a housing and any of the above-described battery cells, wherein the battery cells are housed within the housing.

[0016] Embodiments of this application also provide an electrical device, including a body and the aforementioned battery, wherein the battery is housed within the body.

[0017] The battery cell, battery, and electrical device provided in this application, by providing a groove on the sealing part, can reduce the area of ​​the sealing part when it is attached to the side wall of the encapsulation part, so that it can be attached to the encapsulation part more smoothly, effectively avoiding the appearance of a wavy appearance between the sealing part and the encapsulation part. Attached Figure Description

[0018] Figure 1 This is a top view of the sealing portion of a packaging film in the prior art after it has been bent.

[0019] Figure 2 This is a three-dimensional structural diagram of the battery cell in one embodiment of this application.

[0020] Figure 3 for Figure 2 The diagram shows a first top view of the battery cell where the sealing part is not attached to the side wall of the encapsulation part.

[0021] Figure 4 for Figure 3 The diagram shows a cross-sectional view of the battery cell along the AA direction.

[0022] Figure 5 for Figure 3 The diagram shows a cross-sectional view of the battery cell along the BB direction.

[0023] Figure 6 This is a cross-sectional schematic diagram of a battery cell using a different electrode assembly (laminated structure) in one embodiment of this application.

[0024] Figure 7 This is a second top view of the battery cell where the sealing part is not attached to the side wall of the encapsulation part.

[0025] Figure 8 for Figure 2 The diagram shows a first top view of the battery cell with the sealing portion attached to the side wall of the encapsulation portion.

[0026] Figure 9 for Figure 8 The diagram shows a cross-sectional view of the battery cell along the CC direction.

[0027] Figure 10 This is a third top view of the battery cell where the sealing part is not attached to the side wall of the encapsulation part.

[0028] Figure 11 This is a fourth top view schematic diagram showing that the sealing part of the battery cell is not attached to the side wall of the encapsulation part.

[0029] Figure 12 This is a fifth top view schematic diagram showing that the sealing part of the battery cell is not attached to the side wall of the encapsulation part.

[0030] Figure 13 This is a sixth top view of the battery cell where the sealing part is not attached to the side wall of the encapsulation part.

[0031] Figure 14 This is a seventh top view schematic diagram showing that the sealing part of the battery cell is not attached to the side wall of the encapsulation part.

[0032] Figure 15 for Figure 6The diagram shown is an exploded view of the battery cell.

[0033] Figure 16 This is a cross-sectional schematic diagram of a battery cell including an insulating sheet in one embodiment of this application.

[0034] Figure 17 This is a three-dimensional structural diagram of the battery cell in another embodiment of this application.

[0035] Figure 18 for Figure 17 The diagram shows a cross-sectional view of the battery cell along the DD direction.

[0036] Figure 19 This is a cross-sectional schematic diagram of a battery cell including a first adhesive member in one embodiment of this application.

[0037] Figure 20 This is a cross-sectional schematic diagram of a battery cell including a second adhesive member in one embodiment of this application.

[0038] Figure 21 This is a three-dimensional structural diagram of the battery in one embodiment of this application.

[0039] Figure 22 This is a three-dimensional structural diagram of an electrical device in one embodiment of this application.

[0040] Explanation of main component symbols 100, 100a, 100b, 100c: Battery cell; 10, 10a: Electrode assembly; 11: First electrode; 12: Second electrode; 13: First tab; 14: Second tab; 15: Insulating adhesive; 16: Insulating sheet; 20, 20a: Housing; 21, 21a, 21b, 21c: Encapsulation part; 211, 211a, 211b, 211c: Sidewall; 212a, 212b: First end face; 213a, 213b: Second end face; 22, 22a 22b, 22c: Sealing part; 221: Groove; d: Minimum distance; 23, 23a: Connection; 24, 24a: First encapsulation film; 241, 241a: First part; 242, 242a: First edge part; 25, 25a: Second encapsulation film; 251, 251a: Second part; 252, 252a: Second edge part; 26: First adhesive; 27: Second adhesive; 300: Battery; 30: Housing; 500: Electrical device; 50: Body. Detailed Implementation

[0041] The technical solutions of the embodiments of this application will be described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments.

[0042] It should be noted that when a component is considered to be "connected" to another component, it can be directly connected to the other component or may also have an intervening component. When a component is considered to be "placed" on another component, it can be directly placed on the other component or may also have an intervening component. The terms "top," "bottom," "upper," "lower," "left," "right," "front," "back," and similar expressions used in this article are for illustrative purposes only.

[0043] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application.

[0044] An embodiment of this application provides a battery cell, including an electrode assembly (which may be a wound structure or a stacked structure) and a housing. The electrode assembly includes tabs and is disposed within the housing. The housing includes an encapsulation portion and a sealing portion connected to the encapsulation portion. The sealing portion extends outward from the encapsulation portion. The electrode assembly is located within the encapsulation portion, and the tabs protrude outward from the sealing portion. The encapsulation portion includes a sidewall, and a slot is formed on the sealing portion. The slot is formed by recessing from the outer periphery of the sealing portion towards the connection between the sealing portion and the encapsulation portion, and the sealing portion is attached to the sidewall.

[0045] By using this battery cell, and by setting a slot on the sealing part, when the sealing part is attached to the side wall of the encapsulation part, the circumferential area of ​​the sealing part is reduced, making it more flat when attached to the encapsulation part. This avoids the appearance of a wavy surface on the encapsulation part, improves the utilization rate of the sealing part, and also reduces the area occupied by the battery cell.

[0046] Embodiments of this application also provide a battery, including a housing and the aforementioned battery cell, wherein the battery cell is housed within the housing.

[0047] The battery uses the aforementioned cells, which further improves the space utilization rate inside the casing. Because the cells occupy a smaller volume, it is easier to optimize the internal structure of the battery. At the same time, because the volume occupied by the cells is reduced, the volume of the battery can also be reduced accordingly.

[0048] This application also provides an electrical device, including a body and the aforementioned battery, wherein the battery is housed within the body.

[0049] Taking over-ear headphones as an example, the use of the aforementioned battery can further reduce the weight of the headphones, providing users with a more comfortable experience.

[0050] The embodiments of this application will now be described with reference to the accompanying drawings. Unless otherwise specified, the following embodiments and features described herein can be combined with each other.

[0051] First Embodiment Please see Figure 2 and Figure 3 The battery cell 100 provided in this application includes an electrode assembly 10 and a housing 20. The electrode assembly 10 is disposed inside the housing 20, and the housing 20 is used to encapsulate the electrode assembly 10 so that the electrode assembly 10 can conduct current when in use, and provide power to the electrical device using the battery cell 100.

[0052] Please see Figure 4 and Figure 5 , Figure 4 and Figure 5 The diagram shown is a cross-sectional view of the electrode assembly 10 before the outer casing 20 is fully encapsulated. The electrode assembly 10 includes multiple first electrode plates 11 and multiple second electrode plates 12, which are alternately stacked. A separator (not shown) is provided between each first electrode plate 11 and each second electrode plate 12 to separate the first electrode plate 11 and the second electrode plate 12, preventing short circuits caused by contact between the first electrode plate 11 and the second electrode plate 12, while ensuring the normal passage of ions during charging and discharging.

[0053] It is understood that in other embodiments, the electrode assembly 10 may also be formed by winding, and the cross-section of the electrode assembly 10 may have different shapes along the direction of stacking or winding.

[0054] The electrode assembly 10 further includes a first electrode tab 13 and a second electrode tab 14. The first electrode tab 13 is connected to the first electrode plate 11, and the second electrode tab 14 is connected to the second electrode plate 12. The first electrode plate 11 and the second electrode plate 12 extend from the inside of the housing 20 to connect with the external structure.

[0055] Preferably, to ensure a tight connection between the outer casing 20 and the first tab 13 and the second tab 14, and to prevent external impurities from entering the interior of the outer casing 20 and affecting the use of the electrode assembly 10, as well as to prevent leakage of substances such as electrolyte from the outer casing 20, the battery cell 100 further includes an insulating adhesive 15. The insulating adhesive 15 is disposed between the first tab 13, the second tab 14 and the outer casing 20, and connects the first tab 13, the second tab 14 and the outer casing 20 through the insulating adhesive 15, while sealing the connection position and improving the sealing effect of the battery cell 100. Further, the insulating adhesive 15 is tab adhesive.

[0056] It is understood that in other embodiments, the insulating adhesive 15 may be replaced with other structures that have equivalent effects or functions.

[0057] In one embodiment, the first electrode 11 and the second electrode 12 are stacked vertically, and the first electrode tab 13 and the second electrode tab 14 extend from opposite sides of the outer casing 20, reducing the possibility of contact between the first electrode tab 13 and the second electrode tab 14. Further, the first electrode 11 is a positive electrode, the first electrode tab 13 is a positive electrode tab, and correspondingly, the second electrode 12 is a negative electrode, and the second electrode tab 14 is a negative electrode tab.

[0058] Preferably, the first electrode 13 and the second electrode 14 include at least one of the following elements: aluminum, nickel, manganese, cadmium, copper, iron, magnesium, silicon, titanium, zirconium, vanadium, zinc, lead, sulfur, phosphorus, tin, arsenic, bismuth, and antimony.

[0059] The materials and processes used to manufacture the first electrode 11, the second electrode 12, the first tab 13, the second tab 14, and the separator are common in the prior art and will not be described in detail here.

[0060] Please see Figure 6 In another embodiment, the plurality of first electrode plates 11 and the plurality of second electrode plates 12 may also be stacked or wound in a vertical direction.

[0061] Please see Figure 7 In another embodiment, the first electrode 13 and the second electrode 14 may be arranged adjacent to each other, maintaining a certain distance between the first electrode 13 and the second electrode 14 to avoid contact between them.

[0062] Please see Figure 4 and Figure 5 The housing 20 includes an encapsulation portion 21 and a sealing portion 22. The encapsulation portion 21 is connected to the sealing portion 22. Further, the sealing portion 22 extends outward from the encapsulation portion 21. The encapsulation portion 21 houses the electrode assembly 10. The first electrode tab 13 and the second electrode tab 14 protrude outward from the sealing portion 22 to extend to the outside of the housing 20, thereby enabling connection to an external structure. Figure 4 As shown in the view, the sealing part 22 is located at the lower end of the encapsulation part 21.

[0063] Further, the outer casing 20 comprises at least one of polyethylene, polypropylene, polyester, nylon, polyphenylene ether, aluminum foil and aluminum alloy foil, magnesium foil and magnesium alloy foil, titanium foil and titanium alloy foil, copper foil and copper alloy foil, iron foil and iron alloy foil, polyethylene terephthalate, acrylonitrile-butadiene-styrene copolymer, polystyrene, polycarbonate, and styrene-acrylonitrile copolymer. The outer casing 20 is made of at least one of the above materials; for example, using polyethylene to make the outer casing 20 can reduce the weight of the outer casing 20, thereby reducing the overall weight of the battery cell 100.

[0064] The encapsulation portion 21 includes a sidewall 211. Further, this sidewall 211 is the outermost wall 211 of the encapsulation portion 21. When the sealing portion 22 is connected to the encapsulation portion 21, the sealing portion 22 adheres to the outermost wall 211 of the encapsulation portion 21. Figure 6 As shown. In this context, "outer" in outer wall 211 refers to the description relative to the interior of the encapsulation portion 21 that houses the electrode assembly 10.

[0065] Please refer to the following: Figure 3 The sealing portion 22 has a groove 221, which is recessed from the outer periphery of the sealing portion 22 toward the connection 23 between the encapsulation portion 21 and the sealing portion 22. The outer periphery of the sealing portion 22 is the edge of the sealing portion 22 away from the encapsulation, that is, the outermost position of the sealing portion 22.

[0066] In one embodiment, the minimum distance between the edge of the slot 221 and the connection 23 between the encapsulation portion 21 and the sealing portion 22 is d, where d is greater than or equal to 0.5 mm. The edge of the slot 221 refers to the edge that extends the furthest distance from the outer periphery of the sealing portion 22 towards the connection 23. The minimum distance d is set to be equal to or greater than 0.5 mm to avoid the internal structure of the encapsulation portion 21 being exposed due to the small distance between the sealing portion 22 and the encapsulation portion 21 during the connection process, which would prevent the electrode assembly 10 from being encapsulated and thus render the battery cell 100 unusable.

[0067] The groove 221 is roughly V-shaped. It should be understood that "roughly" means it looks like, but is not absolutely V-shaped. The groove 221 may have a rounded transition near the connection 23. Multiple grooves 221 are provided on the sealing part 22, and these grooves 221 are spaced apart, thereby effectively reducing the overall area of ​​the sealing part 22.

[0068] Please see Figure 8 and Figure 9 , Figure 8This describes the case where the sealing part 22 is bent at the connection 23 and then attached to the side wall 211 of the encapsulation part 21. Because the sealing part 22 has a slot 221, its area is reduced. When attached to the encapsulation part 21, the sealing part 22 can be flatly attached to the side wall 211 without wrinkles, thus reducing the overall volume of the battery cell 100 and improving the space utilization of the sealing part 22.

[0069] Please see Figure 10 , Figure 11 and Figure 12 In other embodiments, the shape of the slot 221 is not limited to the generally V-shaped shape described above. Furthermore, the slot 221 can also be U-shaped, polygonal, irregularly curved, etc., for example in... Figure 10 As shown, the sealing part 22 is provided with a plurality of slots 221 of different shapes. Figure 11 As shown, the slot 221 can also be arc-shaped or semi-circular, and multiple arc-shaped or semi-circular slots 221 are equidistantly arranged. Figure 12 As shown, the slot 221 can also be trapezoidal in shape, and multiple trapezoidal slots 221 are equidistantly arranged. By setting slots 221 of different shapes, the area of ​​the sealing part 22 can be changed, so that cells 100 of different sizes can be packaged in this way, thereby improving the space utilization of the sealing part 22.

[0070] Please see Figure 13 and Figure 14 In other embodiments, the number of slots 221 can also be set according to different needs. For example, in Figure 13 In the middle, the sealing part 22 is provided with two slots 221, and the two slots 221 are symmetrically arranged. Figure 14 In this design, the sealing portion 22 is provided with three slots 221, which are spaced apart. By using different numbers of slots 221, the area of ​​the sealing portion 22 can be changed, so that battery cells 100 of different sizes can be packaged in this way, thereby improving the space utilization of the sealing portion 22.

[0071] It is understood that the number and shape of the slots 221 are not limited to this.

[0072] The outer casing 20 can be divided into the encapsulation portion 21 and the sealing portion 22 by regional division. Please refer to [link / reference]. Figure 15Specifically, according to the structure, the outer shell 20 includes a first encapsulation film 24 and a second encapsulation film 25. The first encapsulation film 24 includes a first portion 241 and a first edge portion 242 connected to the first portion 241. The second encapsulation film 25 includes a second portion 251 and a second edge portion 252 connected to the second portion 251. The first portion 241 and the second portion 251 surround the encapsulation portion 21, and the first edge portion 242 and the second edge portion 252 are connected to form the sealing portion 22.

[0073] In this embodiment, the first portion 241 is an inverted U-shaped receiving cavity, and the first edge portion 242 extends from the end of the first portion 241 near the second encapsulation portion 21 along both horizontally opposite sides for a predetermined length. The second portion 251 is flat, and the second edge portion 252 extends from the end of the second portion 251 along both horizontally opposite sides for a predetermined length, corresponding to the first edge portion 242.

[0074] The flat second portion 251 closes the inverted U-shaped first portion 241 to form the encapsulation portion 21. The first edge portion 242 and the second edge portion 252 are connected to form the sealing portion 22.

[0075] Please see Figure 16 When the outer casing 20 is made of a metallic material, to prevent short circuits in the battery cell 100, the battery cell 100 further includes an insulating sheet 16. The insulating sheet 16 is disposed between the electrode assembly 10 and the outer casing 20 to prevent contact between the electrode assembly 10 and the outer casing 20. Further, the insulating sheet 16 is an insulating gasket.

[0076] It is understood that in other embodiments, the insulating sheet 16 is not limited to this and can be replaced with other forms, such as insulating varnish with insulating properties, which can be sprayed onto the housing 20 to achieve the same insulating effect.

[0077] Second Embodiment Please see Figure 17 and Figure 18 This application also provides another battery cell 100a, which is substantially the same as the battery cell 100 in the first embodiment, except that the sealing portion 22a extends outward from the sidewall 211a of the encapsulation portion 21a. Figure 18 Viewed from the indicated direction, the sealing portion 22a is approximately located in the middle of the encapsulation portion 21a.

[0078] The encapsulation part 21a includes a first end face 212a and a second end face 213a, which are disposed opposite to each other and are respectively connected to the side wall 211a. The distance from the connection point 23a between the sealing part 22a and the encapsulation part 21a to the first end face 212a is greater than or equal to the distance from the connection point 23a to the second end face 213a.

[0079] This ensures that the distance from the connection 23a to the first end face 212a is greater than or equal to the distance from the connection 23a to the second end face 213a. This reduces the distance the sealing part 22a extends along the side wall 211a when it is bent and attached to the side wall 211a of the encapsulation part 21a, allowing the sealing part 22a to adhere better to the side wall 211a on its own.

[0080] Specifically, in this embodiment, the first portion 241a of the first encapsulation film 24a is an inverted U-shaped first receiving cavity, and the second portion 251a of the second encapsulation film 25a is a U-shaped second receiving cavity. The inverted U-shaped first portion 241a and the U-shaped second portion 251a are closed to form the encapsulation portion 21a. The first edge portion 242a extends a predetermined length from the end of the first portion 241a near the end of the second edge portion 252a along the horizontal direction and opposite sides. The second edge portion 252a extends a predetermined length from the end of the second portion 251a near the end of the first edge portion 242a along the horizontal direction and opposite sides, and corresponds to the first edge portion 242a. The first edge portion 242a and the second edge portion 252a form the sealing portion 22a.

[0081] Third Embodiment Please see Figure 19 The battery cell 100b in the third embodiment has a structure that is roughly the same as that of the battery cell 100a in the second embodiment. The difference is that the battery cell 100b in the third embodiment further includes a first adhesive member 26. One end of the first adhesive member 26 is disposed on the side wall 211b, the first end face 212b or the second end face 213b, and the other end of the first adhesive member 26 is disposed on the surface of the sealing part 22b away from the encapsulation part 21b, for fixing the sealing part 22b to the encapsulation part 21b.

[0082] When the length of the sealing part 22b after bending along the side wall 211b is less than the distance of the side wall 211b, the first adhesive 26 is bonded to the side wall 211b and the sealing part 22b.

[0083] When the sealing part 22b is bent in different directions, one end of the first adhesive 26 is bonded to the first end face 212b or the second end face 213b.

[0084] It is understood that this method is also applicable when the first adhesive 26 is disposed on the battery cell 100 in the first embodiment.

[0085] By using the first adhesive 26 to bond the sealing part 22b and the encapsulation part 21b, the sealing part 22b is prevented from springing back after being bent, which would affect the assembly of the cell 100b in the battery.

[0086] The first adhesive 26 includes at least one of the following materials: polyethylene oxide, polyvinylidene fluoride, styrene-butadiene rubber, a polymer of vinylidene fluoride and hexafluoropropylene, polyvinylidene fluoride, modified polyvinylidene fluoride, polyacrylate, modified polyacrylate, modified polyethylene, and modified polydiene.

[0087] In this embodiment, the first adhesive element 26 is adhesive tape. It is understood that in other embodiments, the first adhesive element 26 may be replaced with other structures that have equivalent effects or functions.

[0088] Fourth embodiment Please see Figure 20 The battery cell 100c in the fourth embodiment has a structure that is roughly the same as that of the battery cell 100a in the second embodiment. The difference is that the battery cell 100c in the fourth embodiment further includes a second adhesive member 27. The second adhesive member 27 is disposed between the side wall 211c and the surface of the sealing part 22c near the encapsulation part 21c, so as to fix the sealing part 22c on the encapsulation part 21c.

[0089] By providing the second adhesive 27 between the encapsulation portion 21c and the sealing portion 22c, the sealing portion 22c is prevented from springing back after being bent, thereby affecting the assembly of the cell 100c in the battery.

[0090] The second adhesive 27 includes at least one of the following materials: polyethylene oxide, polyvinylidene fluoride, styrene-butadiene rubber, a polymer of vinylidene fluoride and hexafluoropropylene, polyvinylidene fluoride, modified polyvinylidene fluoride, polyacrylate, modified polyacrylate, modified polyethylene, and modified polydiene.

[0091] In this embodiment, the second adhesive 27 is double-sided adhesive. It is understood that in other embodiments, the second adhesive 27 may be replaced with a structure with equivalent effect or function.

[0092] Fifth Embodiment Please see Figure 21Embodiments of this application also provide a battery 300, including a casing 30 and battery cells 100, 100a, 100b, and 100c as described in any of the above embodiments, wherein the battery cells 100, 100a, 100b, and 100c are housed within the casing 30. The battery 300 includes any of the battery cells 100, 100a, 100b, and 100c described in the above embodiments, and therefore possesses all the beneficial effects of the battery cells 100, 100a, 100b, and 100c, which will not be elaborated further here.

[0093] It is understood that in this embodiment, the battery also includes structures such as a circuit board (not shown) and connecting pieces (not shown), and the tabs on the cells 100, 100a, 100b, and 100c are soldered to the circuit board via the connecting pieces. This structure is quite common in the battery industry and will not be described in detail here.

[0094] The tabs of the battery cells 100, 100a, 100b, and 100c form the positive and negative terminals of the battery, so that the battery can be directly used when installed in an electrical device.

[0095] Sixth Embodiment Please see Figure 22 Embodiments of this application also provide an electrical device 500, including a body 50 and a battery 300 as described in the above embodiments. The battery 300 is housed within the body and supplies power to the body 50, enabling the body 50 to obtain electrical energy and thus be used. The electrical device 500 includes the battery 300 described in the above embodiments and therefore possesses all the beneficial effects of the battery 300, which will not be elaborated upon here.

[0096] In one embodiment, the power-consuming device 500 is specifically a wireless Bluetooth headset. It is understood that in other embodiments, the power-consuming device 500 may also be other smart wearable devices, such as sports watches, small lighting devices, etc.

[0097] In summary, the battery cell 100, battery 300, and power device 500 provided in this embodiment reduce the area of ​​the sealing portion 22 attached to the encapsulation portion 21 by creating a slot 221 on the sealing portion 22, thus avoiding wrinkles when the sealing portion 22 is placed on the encapsulation portion 21. Therefore, the volume of the battery cell 100 can be reduced, and space utilization can be improved in structures using the battery cell 100.

[0098] Furthermore, those skilled in the art should recognize that the above embodiments are merely illustrative of this application and are not intended to limit this application. Any appropriate changes and modifications made to the above embodiments within the essential spirit and scope of this application fall within the scope of this application's disclosure.

Claims

1. A battery cell, comprising: Electrode assembly, including tabs; The housing contains the electrode assembly. The outer casing is characterized in that it includes an encapsulation portion and a sealing portion connected to the encapsulation portion, the sealing portion being formed by extending outward from the encapsulation portion, the electrode assembly being located inside the encapsulation portion, and the electrode tabs extending outward from the sealing portion; The encapsulation part includes a sidewall, and the sealing part has a groove. The groove is formed by recessing from the outer periphery of the sealing part toward the connection between the sealing part and the encapsulation part, and the sealing part is attached to the sidewall. The battery cell also includes an insulating sheet disposed between the electrode assembly and the housing; The outer casing includes a first encapsulation film and a second encapsulation film; The first encapsulation film includes a first portion and a first edge portion connected to the first portion, and the second encapsulation film includes a second portion and a second edge portion connected to the second portion; The first portion and the second portion surround the encapsulation portion, and the first edge portion and the second edge portion are connected to form the sealing portion.

2. The battery cell as described in claim 1, characterized in that, The first portion is recessed to form a first receiving cavity, the vertical cross-section of which is inverted U-shaped; the second portion is flat and closes the first portion to form the encapsulation portion.

3. The battery cell as described in claim 1, characterized in that, The first portion is recessed to form a first receiving cavity, the vertical cross-section of the first receiving cavity being inverted U-shaped; the second portion is recessed to form a second receiving cavity, the vertical cross-section of the second receiving cavity being U-shaped; the first receiving cavity and the second receiving cavity surround the encapsulation portion.

4. The battery cell as described in claim 1, characterized in that, The slot is at least one of the following shapes: arc-shaped, V-shaped, semi-circular, U-shaped, and polygonal.

5. The battery cell as described in claim 1, characterized in that, The minimum distance between the edge of the slot and the connection between the encapsulation part and the sealing part is greater than or equal to 0.5 mm.

6. The battery cell as described in claim 1, characterized in that, The encapsulation portion includes a first end face and a second end face opposite to the first end face. The first end face and the second end face are respectively connected to the side wall. The distance from the connection point of the sealing portion and the encapsulation portion to the first end face is greater than or equal to the distance from the connection point to the second end face.

7. The battery cell as described in claim 6, characterized in that, The battery cell also includes a first adhesive member, one end of which is disposed on the side wall, the first end face, or the second end face, and the other end of which is disposed on the surface of the sealing portion away from the encapsulation portion, for fixing the sealing portion to the encapsulation portion.

8. The battery cell as described in claim 1, characterized in that, The battery cell also includes a second adhesive member, which is disposed between the side wall and the surface of the sealing portion near the encapsulation portion, for fixing the sealing portion to the encapsulation portion.

9. A battery, comprising a casing, characterized in that, The battery further includes a cell as described in any one of claims 1 to 8, the cell being housed within the casing.

10. An electrical device, comprising a body, characterized in that, The electrical device further includes the battery as described in claim 9, the battery being housed within the body.

Images