Battery and electric device
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- ZHEJIANG LIWINON ENERGY TECHNOLOGY CO LTD
- Filing Date
- 2025-06-13
- Publication Date
- 2026-07-14
Smart Images
Figure CN224501934U_ABST
Abstract
Description
Technical Field
[0001] This utility model relates to the field of battery technology, and in particular to a battery and electrical equipment. Background Technology
[0002] In related technologies, a battery includes a casing and a battery cell. The casing can specifically be an aluminum-plastic film, and the battery cell is placed inside the casing. After the battery cell is placed inside the casing, double-sided adhesive is applied between the battery cell and the inner wall of the casing to fix the battery cell to the casing, effectively preventing the battery cell from sliding inside the casing.
[0003] Existing batteries typically have double-sided tape applied to the front, back, or both sides of the cell. This double-sided tape effectively secures the cell inside the casing. However, during drop tests or when the cell is subjected to impact, these tape application methods can easily cause the double-sided tape to tear the aluminum foil, damaging the cell. Utility Model Content
[0004] This invention aims to solve at least one of the technical problems existing in the prior art. To this end, this invention proposes a battery that not only effectively secures the battery cell but also effectively prevents damage to the battery cell.
[0005] This utility model also proposes an electrical device.
[0006] The battery according to a first aspect embodiment of the present invention includes:
[0007] The battery cell includes a first surface and a second surface disposed opposite to each other along the thickness direction;
[0008] A packaging bag having a storage cavity, in which the battery cell is disposed, and along the thickness direction of the battery cell, the cavity wall of the storage cavity includes a first wall and a second wall disposed opposite to each other;
[0009] An adhesive component, wherein both sides of the adhesive component are respectively adhered to the first wall and the first surface;
[0010] A flexible adhesive component includes a substrate layer, a first adhesive layer, and a second adhesive layer. The two sides of the substrate layer in the thickness direction are respectively connected to the first adhesive layer and the second adhesive layer. The first adhesive layer and the second adhesive layer are arranged along a first direction. Along the thickness direction of the substrate layer, the projections of the first adhesive layer and the second adhesive layer do not overlap. The two sides of the first adhesive layer are respectively bonded to a second wall and the substrate layer, and the two sides of the second adhesive layer are respectively bonded to a second surface and the substrate layer.
[0011] The battery according to the present invention has at least the following beneficial effects: the battery cell is disposed in the storage cavity, wherein the two sides of the adhesive are respectively bonded to the first wall and the first surface, so that the adhesive can fix the first surface of the battery cell to the first wall of the storage cavity. The flexible adhesive is located between the second surface and the second wall, and the flexible adhesive can fix the second surface of the battery cell to the second wall of the storage cavity. That is, the joint cooperation of the adhesive and the flexible adhesive can fix the battery cell in the storage cavity. Since the flexible adhesive includes a substrate layer, a first adhesive layer and a second adhesive layer, and the first adhesive layer and the second adhesive layer are arranged along a first direction, and the projection of the first adhesive layer and the projection of the second adhesive layer do not overlap along the thickness direction of the substrate layer, after the flexible adhesive attaches the second surface of the battery cell to the second wall, when the battery is dropped, the second surface of the battery cell and the second wall of the storage cavity can respectively exert two opposing tensile forces on the substrate layer. This can cause the substrate layer to deform, thereby providing a certain buffer to reduce the tensile force of the second wall on the second surface, effectively preventing the second surface from being pulled and damaged by the adhesive force of the flexible adhesive. Specifically, the battery can not only effectively secure the battery cells, but also effectively prevent damage to the battery cells.
[0012] According to some embodiments of the present invention, in the battery, along the first direction, the distance between the projection of the first adhesive layer in the thickness direction of the substrate layer and the projection of the second adhesive layer in the thickness direction of the substrate layer is L1, where L1 > 0.
[0013] According to some embodiments of the present invention, the flexible adhesive member has a dimension of L2 in the first direction, where L1 / L2≤1 / 2.
[0014] According to some embodiments of the present invention, the distance between the projection of the first adhesive layer in the thickness direction of the substrate layer and the projection of the second adhesive layer in the thickness direction of the substrate layer along the first direction is L1, where L1=0.
[0015] According to some embodiments of the present invention, the flexible adhesive component further includes a third adhesive layer, the two sides of which are respectively bonded to the second wall and the substrate layer. The adhesive force between the third adhesive layer and the second wall is A, and the adhesive force between the first adhesive layer and the second wall is D, satisfying A < D.
[0016] According to some embodiments of the present invention, the range of D in the battery is 0.05 N / mm to 0.5 N / mm; and / or the range of A is 0.005 N / mm to 0.01 N / mm.
[0017] In some embodiments of the battery according to this utility model, the third adhesive layer is configured to lose its adhesiveness upon contact with the electrolyte.
[0018] According to some embodiments of the present invention, the battery of the third adhesive layer is made of one of acrylic resin adhesive, epoxy resin adhesive, and composite resin adhesive.
[0019] According to some embodiments of the present invention, the battery with the first adhesive layer is made of one of the following materials: rubber, polysiloxane adhesive, polyimide adhesive, and polyurethane adhesive.
[0020] According to some embodiments of the battery of this utility model, the tensile elongation of the substrate layer is B, B≥10%, or the tensile strength of the substrate layer is C, C≥1000Kgf / cm. ² .
[0021] According to some embodiments of the present invention, the battery storage cavity wall includes a heat-sealing layer, a metal layer and an outer layer stacked together. The heat-sealing layer is provided with a first groove, and the flexible adhesive is disposed in the first groove. The groove wall of the first groove facing the battery cell is the second wall. Or, the heat-sealing layer is provided with a second groove, and the adhesive is disposed in the second groove. The groove wall of the second groove facing the battery cell is the first wall.
[0022] The electrical device according to the second aspect of the present invention includes the battery described in any one of the first aspect embodiments.
[0023] The electrical device according to the embodiments of this utility model has at least the following beneficial effects: The battery cell is disposed in a storage cavity, wherein the two sides of the adhesive are respectively adhered to the first wall and the first surface, so that the adhesive can fix the first surface of the battery cell to the first wall of the storage cavity; the flexible adhesive is located between the second surface and the second wall, so that the flexible adhesive can fix the second surface of the battery cell to the second wall of the storage cavity. That is, the combined cooperation of the adhesive and the flexible adhesive can fix the battery cell in the storage cavity. The flexible adhesive includes a substrate layer, a first adhesive layer, and... The second adhesive layer, along with the first and second adhesive layers, is arranged along the first direction. The projections of the first and second adhesive layers do not overlap along the thickness direction of the substrate layer. Therefore, after the flexible adhesive bondes the second side of the battery cell to the second wall, when the battery is dropped, the second side of the battery cell and the second wall of the storage cavity can exert two opposing tensile forces on the substrate layer. This causes deformation of the substrate layer, providing a certain buffer and reducing the tensile force of the second wall on the second side, effectively preventing the second side from being damaged by the adhesive force of the flexible adhesive. Specifically, the battery not only effectively secures the battery cell but also effectively prevents damage to the battery cell. Furthermore, electrical devices equipped with this battery have higher safety.
[0024] Additional aspects and advantages of this invention 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 the invention. Attached Figure Description
[0025] The present invention will be further described below with reference to the accompanying drawings and embodiments, wherein:
[0026] Figure 1 This is a schematic diagram of the flexible adhesive component in the battery according to the first embodiment of the present invention;
[0027] Figure 2 This is a schematic diagram of the flexible adhesive component in the battery according to the second embodiment of the present invention;
[0028] Figure 3 This is a schematic diagram of the flexible adhesive, adhesive, and battery cell in some embodiments of the present invention;
[0029] Figure 4 This is a schematic diagram of a battery according to the first embodiment of the present invention;
[0030] Figure 5 This is a schematic diagram of a battery according to the second embodiment of the present invention;
[0031] Figure 6 for Figure 5 Enlarged view of point A in the middle;
[0032] Figure 7 This is a schematic diagram of the battery according to the third embodiment of the present invention.
[0033] Figure label:
[0034] Battery 10, cell 100, first surface 110, second surface 120, packaging bag 200, storage cavity 210, first wall 211, second wall 212, adhesive 300, flexible adhesive 400, substrate layer 410, first adhesive layer 420, second adhesive layer 430, third adhesive layer 440, heat-sealing layer 500, metal layer 600, outer layer 700, first groove 800. Detailed Implementation
[0035] The embodiments of this utility model 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 utility model, and should not be construed as limiting this utility model.
[0036] In the description of this utility model, it should be understood that the directional descriptions, such as up, down, front, back, left, right, etc., indicate the directional or positional relationship based on the directional or positional relationship shown in the accompanying drawings. They are only for the convenience of describing this utility model 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 utility model.
[0037] In the description of this utility model, "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.
[0038] In the description of this utility model, unless otherwise explicitly defined, terms such as "setting," "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 utility model in conjunction with the specific content of the technical solution.
[0039] In the description of this utility model, 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 utility model. 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.
[0040] Please refer to Figures 1 to 7In some embodiments, the battery 10 includes: a battery cell 100, a packaging bag 200, an adhesive 300, and a flexible adhesive 400. The battery cell 100 includes a first surface 110 and a second surface 120 disposed opposite each other along its thickness direction. The battery cell 100 includes a positive electrode and a negative electrode, and can be formed by stacking and winding the positive and negative electrode sheets. Alternatively, the battery cell 100 can be formed by alternately stacking multiple positive and multiple negative electrode sheets. The first surface 110 and the second surface 120 can be the surfaces with the largest area on the battery cell 100. The packaging bag 200 has a storage cavity 210. The packaging bag 200 can be an aluminum-plastic film. The battery cell 100 is disposed in the storage cavity 210, which can be formed by punching indentations in the aluminum-plastic film. The cavity wall of the storage cavity 210 includes a first wall 211 and a second wall 212 disposed opposite each other along the thickness direction of the battery cell 100. The adhesive 300 can be double-sided adhesive or hot melt adhesive. The two sides of the adhesive 300 are respectively adhered to the first wall 211 and the first surface 110, thus fixing the first surface 110 to the first wall 211 and effectively preventing movement of the first surface 110 on the first wall 211. The flexible adhesive 400 includes a substrate layer 410, a first adhesive layer 420, and a second adhesive layer 430. The two sides of the substrate layer 410 in the thickness direction are respectively connected to the first adhesive layer 420 and the second adhesive layer 430. The first adhesive layer 420 and the second adhesive layer 430 are arranged along a first direction. The first direction can be the length direction of the substrate layer 410 or the width direction of the substrate layer 410. That is, the first adhesive layer 420 and the second adhesive layer 430 are located at opposite ends of the substrate layer 410, and are located on different sides of the substrate layer 410. Along the thickness direction of the substrate layer 410, the projections of the first adhesive layer 420 and the second adhesive layer 430 do not overlap. The two sides of the first adhesive layer 420 are bonded to the second wall 212 and the substrate layer 410, respectively, and the two sides of the second adhesive layer 430 are bonded to the second surface 120 and the substrate layer 410, respectively. The structures of the first adhesive layer 420 and the second adhesive layer 430 are identical.
[0041] Specifically, the battery cell 100 is disposed in the storage cavity 210. The adhesive member 300 is bonded to the first wall 211 and the first surface 110 on both sides, respectively. Thus, the adhesive member 300 can fix the first surface 110 of the battery cell 100 to the first wall 211 of the storage cavity 210. The flexible adhesive member 400 is located between the second surface 120 and the second wall 212, and can fix the second surface 120 of the battery cell 100 to the second wall 212 of the storage cavity 210. That is, the combined action of the adhesive member 300 and the flexible adhesive member 400 can fix the battery cell 100 in the storage cavity 210. The flexible adhesive member 400 includes a substrate layer 410, a first adhesive layer 420, and a second adhesive layer. The first adhesive layer 420 and the second adhesive layer 430 are arranged along the first direction. Along the thickness direction of the substrate layer 410, the projections of the first adhesive layer 420 and the second adhesive layer 430 do not overlap. Therefore, after the flexible adhesive 400 adheres the second surface 120 of the cell 100 to the second wall 212, when the battery 10 is dropped, the second surface 120 of the cell 100 and the second wall 212 of the storage cavity 210 can respectively exert two opposing tensile forces on the substrate layer 410. This can cause the substrate layer 410 to deform, thereby providing a certain buffer to reduce the tensile force of the second wall 212 on the second surface 120, effectively preventing the second surface 120 from being damaged by the adhesive force of the flexible adhesive 400. Specifically, the battery 10 can not only effectively fix the cell 100, but also effectively prevent damage to the cell 100.
[0042] Further explanation is provided below, please refer to Figure 1 The flexible adhesive 400 and adhesive 300 have different structures. For the same dimensions, adhesive 300 has a larger adhesive force when bonding to the first surface 110 or the first wall 211 because it has a larger bonding area. The flexible adhesive 400 has a smaller adhesive force when bonding to the second surface 120 and the second wall 212 because it has a smaller bonding area. Furthermore, the different positions of the first adhesive layer 420 and the second adhesive layer 430 allow for an elastic buffer between the second surface 120 and the second wall 212 when the flexible adhesive 400 bonds to them. This flexible bonding effectively prevents the flexible adhesive 400 from directly tearing the second surface 120. Specifically, the first adhesive layer 420 is located on one side of the substrate layer 410. When the first adhesive layer 420 pulls the substrate layer 410, there is no adhesive force on the other side of the substrate layer 410 corresponding to the first adhesive layer 420, and this position moves away from the second surface 120. Similarly, the second adhesive layer 430 is located on the other side of the substrate layer 410. When the second adhesive layer 430 pulls the substrate layer 410, there is no adhesive force on the side of the substrate layer 410 corresponding to the second adhesive layer 430, and this position also moves away from the second wall 212.
[0043] Further, please refer to Figure 1 In some embodiments, along the first direction, the distance between the projection of the first adhesive layer 420 onto the thickness direction of the substrate layer 410 and the projection of the second adhesive layer 430 onto the thickness direction of the substrate layer 410 is L1, where L1 > 0. Specifically, setting L1 > 0 provides more elastic space for the substrate layer 410, thereby facilitating the deformation of the substrate layer 410. Thus, after the second adhesive member 300 fixes the second surface 120 onto the second wall 212, the second adhesive member 300 will not tear the second surface 120.
[0044] Further, please refer to Figure 1 In some embodiments, the flexible adhesive 400 has a dimension of L2 in the first direction, where L1 / L2 ≤ 1 / 2. Specifically, L1 / L2 cannot exceed 1 / 2. If the value of L1 / L2 is greater than one-half, the space left on the substrate layer 410 for bonding the first adhesive layer 420 and the second adhesive layer 430 will be very small. This will result in a weak adhesive force of the flexible adhesive 400, and the flexible adhesive 400 will not be able to securely fix the second surface 120 to the second wall 212.
[0045] Furthermore, in addition to the above-described structure, the flexible adhesive 400 also has other structures. Specifically, in some embodiments, along the first direction, the distance between the projection of the first adhesive layer 420 onto the thickness direction of the substrate layer 410 and the projection of the second adhesive layer 430 onto the thickness direction of the substrate layer 410 is L1, where L1=0. Specifically, the first adhesive layer 420 occupies half of the area on one side of the substrate layer 410, and the second adhesive layer 430 occupies half of the area on the other side of the substrate layer 410. This allows the flexible adhesive 400 to better bond the second surface 120 and the second wall 212.
[0046] Further, please refer to Figure 2 and Figure 7In some embodiments, the flexible adhesive 400 further includes a third adhesive layer 440, with both sides of the third adhesive layer 440 bonded to the second wall 212 and the substrate layer 410, respectively. The adhesive force between the third adhesive layer 440 and the second wall 212 is A, and the adhesive force between the first adhesive layer 420 and the second wall 212 is D, satisfying A < D. Specifically, the third adhesive layer 440 and the first adhesive layer 420 are both located on the same side of the substrate layer 410. When the flexible adhesive 400 is bonded to the second wall 212, the design of providing the third adhesive layer 440 facilitates the bonding of the flexible adhesive 400 to the second wall 212. Without the third adhesive layer 440, bonding the second wall 212 solely through the first adhesive layer 420 would lead to bonding difficulties. In addition, the adhesiveness of the third adhesive layer 440 is less than that of the first adhesive layer 420. Therefore, the third adhesive layer 440 is easy to detach from the second wall 212. This allows the design of the first adhesive layer 420 and the second adhesive layer 430 at different positions to remain effective, effectively preventing the flexible adhesive 400 from tearing the battery cell 100.
[0047] Further, in some embodiments, D ranges from 0.05 N / mm to 0.5 N / mm, and / or A ranges from 0.005 N / mm to 0.01 N / mm. Specifically, the adhesive force of the first adhesive layer 420 can be 0.05 N / mm, 0.06 N / mm, 0.07 N / mm, 0.08 N / mm, 0.09 N / mm, 0.1 N / mm, 0.15 N / mm, 0.2 N / mm, 0.25 N / mm, 0.3 N / mm, 0.35 N / mm, 0.4 N / mm, 0.45 N / mm, or 0.5 N / mm. When the adhesive force of the first adhesive layer 420 is greater than 0.5 N / mm, the adhesive force of the first adhesive layer 420 is too large, which will cause the flexible adhesive 400 to damage the battery cell 100. When the adhesive force of the first adhesive layer 420 is less than 0.05 N / mm, the adhesive force is too small, and the flexible adhesive 400 does not effectively fix the battery cell 100. The adhesive force of the third adhesive layer 440 can be 0.005 N / mm, 0.006 N / mm, 0.007 N / mm, 0.008 N / mm, 0.009 N / mm, or 0.01 N / mm. When the adhesive force of the third adhesive layer 440 is greater than 0.01 N / mm, the adhesive force is too large, which results in insufficient buffering provided by the flexible adhesive force to the battery cell 100, easily causing damage to the battery cell 100. When the adhesive force of the third adhesive layer 440 is less than 0.005 N / mm, the adhesive force is too small, which makes it difficult for the flexible adhesive 400 to adhere to the second wall 212.
[0048] The specific method for testing the adhesion force of the first adhesive layer 420 and the third adhesive layer 440 can be as follows: 1. Prepare the battery 10 and disassemble it in the battery 10 disassembly room (temperature 25±5, humidity ≤10%). After disassembling the battery 10, the battery 10 needs to retain the bonding area between the flexible adhesive 400 and the packaging bag 200, the cell 100 and the aluminum-plastic film are bonded together, and a portion of the longitudinal length (5~10mm) of aluminum-plastic film is reserved for bonding spare tape for testing.
[0049] 2. The spare tape is bonded together with the reserved aluminum-plastic film to facilitate clamping by the tensile testing machine. The upper end of the tensile testing machine clamps the aluminum-plastic film surface adhesive and the spare tape, and the lower end clamps the main body of the battery cell 100. The tensile testing machine is tested at a speed of 300mm / min. The range of 20-80mm is taken, and the average of the maximum values of each of the 5 ranges is divided by the width W (mm) and the value is recorded.
[0050] Furthermore, in some embodiments, the third adhesive layer 440 is configured to lose its adhesiveness upon contact with the electrolyte. Specifically, before contact with the electrolyte, the third adhesive layer 440 is adhesive. The adhesiveness of the third adhesive layer 440 and the first adhesive layer 420 facilitates the bonding of the flexible adhesive member 400 to the second wall 212. After the flexible adhesive member 400 and the adhesive member 300 fix the battery cell 100 in the storage cavity 210, electrolyte is injected into the storage cavity 210. At this time, the third adhesive layer 440 loses its adhesiveness, and only the first adhesive layer 420 and the second adhesive layer 430 of the flexible adhesive member 400 function. The flexible adhesive member 400 can fix the battery cell 100 on the one hand, and on the other hand, it can effectively prevent damage to the battery cell 100.
[0051] Furthermore, in some embodiments, the material of the third adhesive layer 440 includes one of acrylic resin, epoxy resin, and composite resin. Specifically, the acrylic resin, epoxy resin, or composite resin loses its adhesiveness upon contact with the electrolyte. Thus, the third adhesive layer 440 initially assists the flexible adhesive 400 in bonding to the second wall 212, and then loses its function, effectively preventing the third adhesive layer 440 from damaging the battery cell 100 by increasing the adhesion of the flexible adhesive 400.
[0052] Furthermore, in some embodiments, the material of the first adhesive layer 420 includes one of rubber, polysiloxane adhesive, polyimide adhesive, and polyurethane adhesive. The material of the third adhesive layer 440 is acrylic resin adhesive. Specifically, acrylic resin adhesive contains polar functional groups such as -OH and -COOH, exhibiting a highly polar adhesive layer that is easily swollen by the electrolyte, resulting in low viscosity. Styrene-isoprene-styrene copolymer is the main component of rubber, with a relatively stable structure, better electrolyte resistance, and stronger adhesion. The material of the first adhesive layer 420 can also be one of polysiloxane adhesive, polyimide adhesive, and polyurethane adhesive.
[0053] Further, in some embodiments, the substrate layer 410 is PE, PP, PET, or PI. The elongation at break of the substrate layer 410 is B, where B ≥ 10%. Alternatively, the tensile strength of the substrate layer 410 is C, where C ≥ 1000 kgf / cm². Specifically, the elongation at break of the substrate layer 410 refers to the elongation at break in the width direction or the elongation at break in the length direction. B can specifically be 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, or 30%, etc. If the elongation at break of the substrate layer 410 is less than 10%, the deformation of the substrate layer 410 is small, which may cause the flexible adhesive 400 to damage the battery cell 100. Specifically, the tensile strength of the substrate layer 410 refers to the tensile strength at break in the width direction or the tensile strength at break in the length direction. The tensile strength of the substrate layer 410 in the length direction can be 1200 Kgf / cm², 1300 Kgf / cm², 1400 Kgf / cm², 1500 Kgf / cm², 1600 Kgf / cm², or 2000 Kgf / cm². The tensile strength of the substrate layer 410 in the width direction can be 1000 Kgf / cm², 1100 Kgf / cm², 1200 Kgf / cm², 1300 Kgf / cm², 1400 Kgf / cm², or 1500 Kgf / cm². When C ≥ 1000 Kgf / cm², this effectively prevents the substrate layer 410 from breaking, thereby effectively preventing the battery cell 100 from moving and being damaged within the storage cavity 210.
[0054] The tensile elongation test method for the substrate layer 410 can be performed by pulling the substrate layer 410 using a tensile testing machine. The specific parameters are: Tensile strength = P / (W*T), where P is the maximum load; W is the test width of the substrate layer 410; T is the thickness of the substrate layer 410; test speed: 200 mm / min; substrate layer 410 width: 15 mm. The tensile strength test method for the substrate layer 410 can also be performed by pulling the substrate layer 410 using a tensile testing machine. The specific parameters are: Elongation = (L-L0) / L0*100%, where L0 is the initial length of the substrate layer 410; L is the total elongation at fracture of the tensile substrate layer 410.
[0055] Further, please refer to Figure 5 and Figure 6 In some embodiments, the cavity wall of the storage cavity 210 includes a heat-sealing layer 500, a metal layer 600, and an outer layer 700 stacked together. The heat-sealing layer 500 may be a PP layer, the metal layer 600 may be an aluminum layer, and the outer layer 700 may be a nylon layer. The heat-sealing layer 500 is provided with a first groove 800, and a flexible adhesive 400 is disposed in the first groove 800. The groove wall of the first groove 800 facing the cell 100 is a second wall 212. And / or, the heat-sealing layer 500 is provided with a second groove, and an adhesive 300 is disposed in the second groove. The groove wall of the second groove facing the cell 100 is a first wall 211. Specifically, the first groove 800 can be formed by thinning the PP layer of the aluminum-plastic film. The first groove 800 facilitates the embedding of the flexible adhesive 400 therein, which can improve the adhesion between the flexible adhesive 400 and the second wall 212, and improve the pass rate of the drop test of the battery 10. The depth of the first groove 800 is 1μm to 50μm. In addition, a second groove can be provided on the first wall 211 to further improve the safety of the battery 10.
[0056] In some embodiments, the electrical device includes a battery 10 as described in any of the above embodiments. Specifically, the battery cell 100 is disposed in the storage cavity 210, wherein the two sides of the adhesive member 300 are respectively adhered to the first wall 211 and the first surface 110, so that the adhesive member 300 can fix the first surface 110 of the battery cell 100 to the first wall 211 of the storage cavity 210. The flexible adhesive member 400 is located between the second surface 120 and the second wall 212, and the flexible adhesive member 400 can fix the second surface 120 of the battery cell 100 to the second wall 212 of the storage cavity 210. That is, the joint cooperation of the adhesive member 300 and the flexible adhesive member 400 can fix the battery cell 100 in the storage cavity 210. The flexible adhesive member 400 includes a substrate layer 410, a first adhesive layer 420 and a second adhesive layer. The first adhesive layer 420 and the second adhesive layer 430 are arranged along the first direction. Along the thickness direction of the substrate layer 410, the projections of the first adhesive layer 420 and the second adhesive layer 430 do not overlap. Therefore, after the flexible adhesive 400 adheres the second surface 120 of the cell 100 to the second wall 212, when the battery 10 is dropped, the second surface 120 of the cell 100 and the second wall 212 of the storage cavity 210 can respectively exert two opposing tensile forces on the substrate layer 410. This can cause the substrate layer 410 to deform, thereby providing a certain buffer to reduce the tensile force of the second wall 212 on the second surface 120, effectively preventing the second surface 120 from being damaged by the adhesive force of the flexible adhesive 400. Specifically, the battery 10 can not only effectively fix the cell 100, but also effectively prevent damage to the cell 100. Furthermore, electrical devices with this battery 10 have higher safety.
[0057] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings. However, the present invention 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 the present invention. Furthermore, the embodiments of the present invention and the features thereof can be combined with each other unless otherwise specified.
Claims
1. A battery, characterized in that, include: The battery cell includes a first surface and a second surface disposed opposite to each other along the thickness direction; A packaging bag having a storage cavity, in which the battery cell is disposed, and along the thickness direction of the battery cell, the cavity wall of the storage cavity includes a first wall and a second wall disposed opposite to each other; An adhesive component, wherein both sides of the adhesive component are respectively adhered to the first wall and the first surface; A flexible adhesive component includes a substrate layer, a first adhesive layer, and a second adhesive layer. The two sides of the substrate layer in the thickness direction are respectively connected to the first adhesive layer and the second adhesive layer. The first adhesive layer and the second adhesive layer are arranged along a first direction. Along the thickness direction of the substrate layer, the projections of the first adhesive layer and the second adhesive layer do not overlap. The two sides of the first adhesive layer are respectively bonded to a second wall and the substrate layer, and the two sides of the second adhesive layer are respectively bonded to a second surface and the substrate layer.
2. The battery according to claim 1, characterized in that, Along the first direction, the distance between the projection of the first adhesive layer in the thickness direction of the substrate layer and the projection of the second adhesive layer in the thickness direction of the substrate layer is L1, where L1 > 0.
3. The battery according to claim 2, characterized in that, The flexible adhesive has a dimension of L2 in the first direction, where L1 / L2≤1 / 2.
4. The battery according to claim 1, characterized in that, Along the first direction, the distance between the projection of the first adhesive layer in the thickness direction of the substrate layer and the projection of the second adhesive layer in the thickness direction of the substrate layer is L1, where L1=0.
5. The battery according to claim 1, characterized in that, The flexible adhesive also includes a third adhesive layer, with its two sides respectively bonded to the second wall and the substrate layer. The adhesive force between the third adhesive layer and the second wall is A, and the adhesive force between the first adhesive layer and the second wall is D, satisfying A < D.
6. The battery according to claim 5, characterized in that, The range of D is 0.05 N / mm to 0.5 N / mm; and / or, the range of A is 0.005 N / mm to 0.01 N / mm.
7. The battery according to claim 5, characterized in that, The third adhesive layer is configured to lose its adhesiveness upon contact with the electrolyte.
8. The battery according to any one of claims 5-7, characterized in that, The material of the third adhesive layer includes one of acrylic resin adhesive, epoxy resin adhesive, and composite resin adhesive.
9. The battery according to claim 1, characterized in that, The material of the first adhesive layer includes one of rubber, polysiloxane adhesive, polyimide adhesive, and polyurethane adhesive.
10. The battery according to claim 1, characterized in that, The tensile elongation of the substrate layer is B, where B ≥ 10%, or the tensile strength of the substrate layer is C, where C ≥ 1000 kgf / cm². ² .
11. The battery according to claim 1, characterized in that, The cavity wall of the storage cavity includes a heat-sealing layer, a metal layer and an outer layer stacked together. The heat-sealing layer is provided with a first groove, and the flexible adhesive is disposed in the first groove. The groove wall of the first groove facing the battery cell is the second wall. Or, the heat-sealing layer is provided with a second groove, and the adhesive is disposed in the second groove. The groove wall of the second groove facing the battery cell is the first wall.
12. Electrical equipment, characterized in that, The battery includes any one of claims 1 to 11.