Battery and electric equipment

Abstract

The invention discloses a battery and electric equipment, and the battery comprises a battery cell which comprises a first surface and a second surface which are oppositely arranged along the thickness direction; the packaging bag is provided with a storage cavity, the battery cell is arranged in the storage cavity, and the cavity wall of the storage cavity comprises a first wall and a second wall which are oppositely arranged; the two sides of the bonding piece are bonded to the first wall and the first face respectively; the flexible bonding piece comprises a base material layer, a first bonding layer and a second bonding layer, the two sides of the base material layer are connected to the first bonding layer and the second bonding layer respectively, the first bonding layer and the second bonding layer are arranged in the first direction, and the projection of the first bonding layer and the projection of the second bonding layer are not overlapped in the thickness direction of the base material layer; wherein the two sides of the first bonding layer are bonded to the second wall and the base material layer respectively, and the two sides of the second bonding layer are bonded to the second face and the base material layer respectively. The battery provided by the invention not only can effectively fix the battery cell, but also can effectively prevent the battery cell from being damaged.

Description

Technical Field

[0001] The present invention relates to the technical field of batteries, and in particular to a battery and an electrical device. Background Art

[0002] In related technologies, a battery consists of a housing, which can be made of aluminum-plastic film, and a cell. Once the cell is inside the housing, double-sided tape is placed between the cell and the inner wall of the housing to secure it to the housing, effectively preventing it from sliding inside.

[0003] Existing batteries typically have double-sided tape applied to the front, back, or both sides of the battery cell. This double-sided tape effectively secures the battery cell to the casing. However, these adhesive application methods can easily cause the double-sided tape to tear through the aluminum foil during drop tests or when the battery cell is impacted, potentially damaging the battery cell. Summary of the Invention

[0004] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention provides a battery that can not only effectively fix the battery core, but also effectively prevent the battery core from being damaged.

[0005] The present invention also provides an electrical device.

[0006] A battery according to an embodiment of the first aspect of the present invention includes: The battery cell comprises a first surface and a second surface arranged opposite to each other in a thickness direction; The packaging bag has a storage cavity, the battery cell is arranged in the storage cavity, and along the thickness direction of the battery cell, the cavity wall of the storage cavity includes a first wall and a second wall arranged opposite to each other; an adhesive member, two sides of which 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, wherein 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, and along the thickness direction of the substrate layer, the projection of the first adhesive layer and the projection of the second adhesive layer do not overlap with each other; wherein the two sides of the first adhesive layer are respectively bonded to the second wall and the substrate layer, and the two sides of the second adhesive layer are respectively bonded to the second surface and the substrate layer.

[0007] According to an embodiment of the present invention, a battery has at least the following advantageous effects: a battery cell is disposed in a storage cavity, wherein two sides of an adhesive member are respectively adhered to the first wall and the first surface, so that the adhesive member can fix the first surface of the battery cell to the first wall of the storage cavity, and the flexible adhesive member is located between the second surface and the second wall, so that the flexible adhesive member can fix the second surface of the battery cell to the second wall of the storage cavity. That is, the adhesive member and the flexible adhesive member cooperate to fix the battery cell in the storage cavity. In particular, since the flexible adhesive member 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, along the thickness direction of the substrate layer, the projection of the first adhesive layer and the projection of the second adhesive layer do not overlap. Therefore, after the flexible adhesive member adheres the second surface of the battery cell to the second wall, when the battery falls, the second surface of the battery cell and the second wall of the storage cavity can respectively apply two opposing tensile forces to the substrate layer, which 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 damaged by the adhesive force of the flexible adhesive member. Specifically, the battery can not only effectively fix the battery cells, but also effectively prevent the battery cells from being damaged.

[0008] According to some embodiments of the battery of the present invention, along the first direction, a distance between a projection of the first adhesive layer in the thickness direction of the substrate layer and a projection of the second adhesive layer in the thickness direction of the substrate layer is L1, and L1>0.

[0009] According to some embodiments of the battery of the present invention, a dimension of the flexible adhesive in the first direction is L2, and L1 / L2≤1 / 2.

[0010] According to some embodiments of the present invention, in the battery, along the first direction, a distance between a projection of the first adhesive layer in the thickness direction of the substrate layer and a projection of the second adhesive layer in the thickness direction of the substrate layer is L1, where L1=0.

[0011] In a battery according to some embodiments of the present invention, the flexible adhesive further includes a third adhesive layer, two sides of the third adhesive layer are respectively adhered to the second wall and the substrate layer, the bonding force between the third adhesive layer and the second wall is A, and the bonding force between the first adhesive layer and the second wall is D, satisfying A<D.

[0012] According to some embodiments of the present invention, in a battery, 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.

[0013] In batteries according to some embodiments of the present invention, the third adhesive layer is configured to lose its adhesiveness when encountering an electrolyte.

[0014] In the battery according to some embodiments of the present invention, the material of the third adhesive layer includes one of acrylic resin glue, epoxy resin glue, and composite resin glue.

[0015] In the battery according to some embodiments of the present invention, the material of the first adhesive layer includes one of rubber, polysiloxane glue, polyimide glue, and polyurethane glue.

[0016] According to some embodiments of the battery of the present invention, the tensile elongation of the substrate layer is B, B ≥ 10%, or the tensile strength of the substrate layer is C, C ≥ 1000 Kgf / cm ² .

[0017] According to some embodiments of the battery of the present invention, the cavity wall of the storage cavity includes a stacked heat-sealing layer, a metal layer and an outer layer, the heat-sealing layer is provided with a first groove, the flexible adhesive is arranged in the first groove, and the groove wall of the first groove facing the battery cell is the second wall, and / or, the heat-sealing layer is provided with a second groove, the adhesive is arranged in the second groove, and the groove wall of the second groove facing the battery cell is the first wall.

[0018] An electrical device according to an embodiment of the second aspect of the present invention comprises the battery described in any one of the embodiments of the first aspect.

[0019] The electrical device according to the embodiment of the present invention has at least the following beneficial effects: a battery cell is disposed in a storage cavity, wherein two sides of the adhesive member are respectively adhered to the first wall and the first surface, so that the adhesive member can fix the first surface of the battery cell to the first wall of the storage cavity, and the flexible adhesive member is located between the second surface and the second wall, and the flexible adhesive member can fix the second surface of the battery cell to the second wall of the storage cavity. That is, the adhesive member and the flexible adhesive member cooperate to fix the battery cell in the storage cavity. In particular, since the flexible adhesive member 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, along the thickness direction of the substrate layer, the projection of the first adhesive layer and the projection of the second adhesive layer do not overlap. Therefore, after the flexible adhesive member adheres the second surface of the battery cell to the second wall, when the battery falls, the second surface of the battery cell and the second wall of the storage cavity can respectively apply two opposing tensile forces to the substrate layer, which 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, and effectively prevent the second surface from being damaged by the adhesive force of the flexible adhesive member. Specifically, the battery can not only effectively fix the battery core, but also effectively prevent the battery core from being damaged. Furthermore, the safety of the electrical equipment equipped with the battery is higher.

[0020] Additional aspects and advantages of the present invention will be set forth in part in the description which follows and, in part, will be obvious from the description which follows, or may be learned by practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] The present invention will be further described below with reference to the accompanying drawings and embodiments, in which: Figure 1 is a schematic diagram of a flexible adhesive member in a battery according to a first embodiment of the present invention; Figure 2 is a schematic diagram of a flexible adhesive member in a battery according to a second embodiment of the present invention; Figure 3 Schematic diagram of a flexible adhesive member, an adhesive member, and a battery cell in a battery according to some embodiments of the present invention; Figure 4 is a schematic diagram of a battery according to a first embodiment of the present invention; Figure 5 is a schematic diagram of a battery according to a second embodiment of the present invention; Figure 6 for Figure 5 A magnified schematic diagram of point A in the middle; Figure 7 FIG. 4 is a schematic diagram of a battery according to a third embodiment of the present invention.

[0022] Reference numerals: Battery 10, battery 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 seal layer 500, metal layer 600, outer layer 700, first groove 800. DETAILED DESCRIPTION

[0023] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0024] In the description of the present invention, it should be understood that descriptions involving orientations, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings. They are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, they cannot be understood as limitations on the present invention.

[0025] In the description of the present invention, "several" means more than one, "plurality" means more than two, "greater than," "less than," and "exceed" are understood to exclude the number itself, while "above," "below," and "within" are understood to include the number itself. The use of "first" and "second" in the description is solely for the purpose of distinguishing technical features and should not be construed as indicating or implying relative importance, implicitly specifying the number of the indicated technical features, or implicitly specifying the order of the indicated technical features.

[0026] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, and connecting should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0027] In the description of the present invention, reference to terms such as "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the exemplary expressions of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0028] 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 the thickness direction. The battery cell 100 includes a positive electrode sheet and a negative electrode sheet. The battery cell 100 can be formed by stacking the positive electrode sheets and the negative electrode sheets and then winding them. The battery cell 100 can also be formed by alternately stacking multiple positive electrode sheets and multiple negative electrode sheets. The first surface 110 and the second surface 120 may be the largest surfaces on the battery cell 100. The packaging bag 200 has a storage cavity 210. The packaging bag 200 may be an aluminum-plastic film. The battery cell 100 is disposed in the storage cavity 210. The storage cavity 210 in the battery cell 100 can be formed by punching a hole in the aluminum-plastic film. The walls of the storage cavity 210 include 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 may be a double-sided tape, or a hot melt adhesive. The two sides of the adhesive 300 are respectively bonded to the first wall 211 and the first surface 110. The adhesive 300 bonds the first wall 211 and the first surface 110, thereby fixing the first surface 110 to the first wall 211 and effectively preventing the first surface 110 from moving 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. Both sides of the substrate layer 410 in the thickness direction are connected to the first adhesive layer 420 and the second adhesive layer 430, respectively. The first adhesive layer 420 and the second adhesive layer 430 are arranged along a first direction. The first direction may 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 projection of the first adhesive layer 420 and the projection of the second adhesive layer 430 do not overlap. The two sides of the first adhesive layer 420 are respectively bonded to the second wall 212 and the substrate layer 410, while the two sides of the second adhesive layer 430 are respectively bonded to the second surface 120 and the substrate layer 410. The first adhesive layer 420 and the second adhesive layer 430 have the same structure.

[0029] Specifically, the battery cell 100 is arranged in the storage cavity 210, wherein the two sides of the adhesive 300 are respectively adhered to the first wall 211 and the first surface 110, so that the adhesive 300 can fix the first surface 110 of the battery cell 100 on the first wall 211 of the storage cavity 210, and the flexible adhesive 400 is located between the second surface 120 and the second wall 212, and the flexible adhesive 400 can fix the second surface 120 of the battery cell 100 on the second wall 212 of the storage cavity 210, that is, the adhesive 300 and the flexible adhesive 400 cooperate to fix the battery cell 100 in the storage cavity 210, wherein, since the flexible adhesive 400 includes a substrate layer 410, a first adhesive layer 420 and a second adhesive layer 430, and the first adhesive layer 420 and the second adhesive layer 430 are arranged along a first direction. Along the thickness direction of the substrate layer 410, the projection of the first adhesive layer 420 and the projection of the second adhesive layer 430 do not overlap. Therefore, after the flexible adhesive 400 adheres the second surface 120 of the battery cell 100 to the second wall 212, when the battery 10 falls, the second surface 120 of the battery cell 100 and the second wall 212 of the storage cavity 210 can respectively apply two opposing pulling forces to the substrate layer 410. This can cause the substrate layer 410 to deform, thereby providing a certain buffer to reduce the pulling 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 battery cell 100, but also effectively prevent the battery cell 100 from being damaged.

[0030] To continue, please refer to Figure 1 The flexible adhesive 400 and the adhesive 300 have different structures. Under the same size, the adhesive 300 has a greater bonding force to the first surface 110 or the first wall 211 because the bonding area is larger. The flexible adhesive 400 has a smaller bonding force to the second surface 120 and the second wall 212 because the bonding area is smaller. In addition, the first adhesive layer 420 and the second adhesive layer 430 are arranged in different positions. This allows the flexible adhesive 400 to have an elastic buffer between the second surface 120 and the second wall 212 when bonding the second surface 120 and the second wall 212. The second surface 120 and the second wall 212 are flexibly bonded, effectively preventing 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, the other side of the substrate layer 410 corresponding to the first adhesive layer 420 has no adhesive force, and this position leaves 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, the side of the substrate layer 410 corresponding to the second adhesive layer 430 has no adhesive force, and this position will also leave the second wall 212.

[0031] Further, please refer to Figure 1 In some embodiments, along the first direction, the distance between the projection of the first adhesive layer 420 in the thickness direction of the substrate layer 410 and the projection of the second adhesive layer 430 in the thickness direction of the substrate layer 410 is L1, where L1>0. Specifically, the setting of L1>0 can provide more elastic space for the substrate layer 410, thereby facilitating the deformation of the substrate layer 410. As a result, after the second adhesive 300 secures the second surface 120 to the second wall 212, the second adhesive 300 will not tear the second surface 120.

[0032] Further, please refer to Figure 1 In some embodiments, the dimension of the flexible adhesive member 400 in the first direction is L2, and L1 / L2 ≤ 1 / 2. Specifically, the maximum value of L1 / L2 cannot exceed 1 / 2. If the value of L1 / L2 is greater than 1 / 2, the space left on the substrate layer 410 for the first adhesive layer 420 and the second adhesive layer 430 to adhere to each other will be very small. This will result in a weak adhesive force of the flexible adhesive member 400, and the flexible adhesive member 400 will not be able to firmly fix the second surface 120 to the second wall 212.

[0033] Furthermore, in addition to the aforementioned structure, the flexible adhesive member 400 also has other structures. Specifically, in some embodiments, along the first direction, the distance between the projection of the first adhesive layer 420 in the thickness direction of the substrate layer 410 and the projection of the second adhesive layer 430 in the thickness direction of the substrate layer 410 is L1, where L1 = 0. Specifically, the first adhesive layer 420 occupies half the area of ​​one side of the substrate layer 410, and the second adhesive layer 430 occupies half the area of ​​the other side of the substrate layer 410. This allows the flexible adhesive member 400 to effectively bond to the second surface 120 and the second wall 212.

[0034] Further, please refer to Figure 2 and Figure 7In some embodiments, the flexible adhesive member 400 further includes a third adhesive layer 440. Two sides of the third adhesive layer 440 are bonded to the second wall 212 and the substrate layer 410, respectively. The bonding force between the third adhesive layer 440 and the second wall 212 is A, and the bonding 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 located on the same side of the substrate layer 410. The provision of the third adhesive layer 440 facilitates bonding the flexible adhesive member 400 to the second wall 212. Without the third adhesive layer 440, bonding the flexible adhesive member 400 to the second wall 212 using only the first adhesive layer 420 would be inconvenient. In addition, the viscosity of the third adhesive layer 440 is lower than that of the first adhesive layer 420, so the third adhesive layer 440 can be easily separated from the second wall 212, which can make the design of the first adhesive layer 420 and the second adhesive layer 430 at different positions still effective, effectively preventing the flexible adhesive 400 from tearing the battery cell 100.

[0035] Furthermore, 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 adhesion 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 adhesion of the first adhesive layer 420 is greater than 0.5 N / mm, the adhesion of the first adhesive layer 420 is too large, which may 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 of the first adhesive layer 420 is too weak, and the flexible adhesive member 400 is not effective in fixing 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 of the third adhesive layer 440 is too strong, which will result in the flexible adhesive force providing less buffering 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 of the third adhesive layer 440 is too weak, which will make it inconvenient for the flexible adhesive member 400 to adhere to the second wall 212.

[0036] The adhesion test method of the first adhesive layer 420 and the third adhesive layer 440 may specifically include: 1. Prepare the battery 10 and disassemble it in a battery 10 disassembly room (temperature 25±5, humidity ≤10%). After disassembling the battery 10, the bonding area between the flexible adhesive 400 and the packaging bag 200 must be retained, the battery cell 100 and the aluminum-plastic film must be bonded together, and a portion of the aluminum-plastic film with a longitudinal length (5-10 mm) must be reserved for bonding with a spare tape test; 2. The spare tape is bonded to the reserved aluminum-plastic film for easy 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 tail body of the battery cell 100. The tensile testing machine tests at a speed of 300mm / min. Take the interval of 20-80mm, take the average of the maximum value of each interval in 5 intervals, divide it by the width W (mm) to calculate and record the value.

[0037] Furthermore, in some embodiments, the third adhesive layer 440 is configured to lose its viscosity upon contact with the electrolyte. Specifically, before the third adhesive layer 440 comes into 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 adhesion of the flexible adhesive member 400 to the second wall 212. After the flexible adhesive member 400 and the adhesive member 300 secure the battery cell 100 in the storage cavity 210, the electrolyte is injected into the storage cavity 210. At this time, the third adhesive layer 440 loses its viscosity, and only the first adhesive layer 420 and the second adhesive layer 430 of the flexible adhesive member 400 are functional. The flexible adhesive member 400 can secure the battery cell 100 on the one hand, and on the other hand, the flexible adhesive member 400 can also effectively prevent the battery cell 100 from being damaged.

[0038] Furthermore, in some embodiments, the third adhesive layer 440 is made of one of acrylic resin glue, epoxy resin glue, and composite resin glue. Specifically, the acrylic resin glue, epoxy resin glue, or composite resin glue loses its adhesiveness upon contact with the electrolyte. Thus, the third adhesive layer 440 initially assists the flexible adhesive 400 in adhering to the second wall 212, but then loses its function, effectively preventing the third adhesive layer 440 from damaging the battery cell 100 by increasing the adhesiveness of the flexible adhesive 400.

[0039] Furthermore, in some embodiments, the material of the first adhesive layer 420 includes one of rubber, silicone glue, polyimide glue, and polyurethane glue. The material of the third adhesive layer 440 is acrylic resin glue. Specifically, acrylic resin glue contains polar functional groups such as -0H and -COOH in the glue, which exhibits a high polarity adhesive layer and is easily swollen by the electrolyte, resulting in low viscosity. Styrene-isoprene-styrene copolymer is the main component of rubber, has a relatively stable relative structure, better electrolyte resistance, and exhibits stronger bonding force. The material of the first adhesive layer 420 can also be one of silicone glue, polyimide glue, and polyurethane glue.

[0040] Furthermore, in some embodiments, the substrate layer 410 is made of PE, PP, PET, or PI. The tensile elongation of the substrate layer 410 is B, where B is ≥ 10%. Alternatively, the tensile strength of the substrate layer 410 is C, where C is ≥ 1000 kgf / cm². The tensile elongation of the substrate layer 410 specifically refers to the tensile elongation of the substrate layer 410 in the width direction, or the tensile elongation of the substrate layer 410 in the length direction. Specifically, B can be 10%, 12%, 14%, 16%, 18%, 20%, 22%, 24%, 26%, 28%, or 30%. If the tensile elongation 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. The tensile strength of the substrate layer 410 specifically refers to the tensile strength of the substrate layer 410 in the width direction, or the tensile strength of the substrate layer 410 in the length direction. The tensile strength of the substrate layer 410 in the longitudinal direction may 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 may 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 can effectively prevent the substrate layer 410 from breaking, thereby effectively preventing the battery cell 100 from moving in the storage cavity 210 and being damaged.

[0041] The tensile elongation of the substrate layer 410 can be specifically tested 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 is 200 mm / min; and width of the substrate layer 410 is 15 mm. The tensile strength of the substrate layer 410 can be specifically tested 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; and L is the total elongation of the stretched substrate layer 410 at break.

[0042] Further, please refer to Figure 5 and Figure 6 In some embodiments, the wall of the storage cavity 210 includes a stacked heat-sealing layer 500, a metal layer 600, and an outer layer 700. 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, in which the flexible adhesive 400 is disposed. The groove wall of the first groove 800 facing the battery cell 100 serves as the second wall 212. Alternatively, the heat-sealing layer 500 is provided with a second groove, in which the adhesive 300 is disposed. The groove wall of the second groove facing the battery cell 100 serves as the 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 insertion of the flexible adhesive 400 therein, thereby improving the bonding strength between the flexible adhesive 400 and the second wall 212 and increasing the pass rate of the battery 10 in the drop test. The depth of the first groove 800 is 1 μm to 50 μm. In addition, a second groove may be provided on the first wall 211 to further improve the safety of the battery 10 .

[0043] In some embodiments, the electrical device includes the battery 10 of any one of the above embodiments. Specifically, the battery cell 100 is arranged in the storage cavity 210, wherein the two sides of the adhesive 300 are respectively adhered to the first wall 211 and the first surface 110, so that the adhesive 300 can fix the first surface 110 of the battery cell 100 on the first wall 211 of the storage cavity 210, and the flexible adhesive 400 is located between the second surface 120 and the second wall 212, and the flexible adhesive 400 can fix the second surface 120 of the battery cell 100 on the second wall 212 of the storage cavity 210, that is, the adhesive 300 and the flexible adhesive 400 cooperate to fix the battery cell 100 in the storage cavity 210, wherein, since the flexible adhesive 400 includes a base material layer 410, a first adhesive layer 420 and a second adhesive layer 430, and the first adhesive layer 420 and the second adhesive layer 430 are arranged along a first direction. Along the thickness direction of the substrate layer 410, the projection of the first adhesive layer 420 and the projection of the second adhesive layer 430 do not overlap. Therefore, after the flexible adhesive 400 adheres the second surface 120 of the battery cell 100 to the second wall 212, when the battery 10 falls, the second surface 120 of the battery cell 100 and the second wall 212 of the storage cavity 210 can respectively apply two opposing tensile forces to 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 not only effectively secures the battery cell 100, but also effectively prevents damage to the battery cell 100. Furthermore, the electrical equipment using this battery 10 is safer.

[0044] While the embodiments of the present invention have been described in detail above with reference to the accompanying drawings, the present invention is not limited to the embodiments described above. Various modifications may be made within the scope of knowledge possessed by a person skilled in the art without departing from the spirit of the present invention. Furthermore, the embodiments of the present invention and the features thereof may be combined with one another unless there is a conflict.

Claims

1. A battery, characterized in that include: The battery cell comprises a first surface and a second surface arranged opposite to each other in a thickness direction; The packaging bag has a storage cavity, the battery cell is arranged in the storage cavity, and along the thickness direction of the battery cell, the cavity wall of the storage cavity includes a first wall and a second wall arranged opposite to each other; an adhesive member, two sides of which 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, wherein 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, and along the thickness direction of the substrate layer, the projection of the first adhesive layer and the projection of the second adhesive layer do not overlap with each other; wherein the two sides of the first adhesive layer are respectively bonded to the second wall and the substrate layer, and the two sides of the second adhesive layer are respectively bonded to the second surface and the substrate layer.

2. The battery according to claim 1, characterized in that Along the first direction, a distance between a projection of the first adhesive layer in the thickness direction of the substrate layer and a projection of the second adhesive layer in the thickness direction of the substrate layer is L1, and L1>0.

3. The battery according to claim 2, characterized in that The dimension of the flexible adhesive in the first direction is L2, and L1 / L2≤1 / 2.

4. The battery according to claim 1, characterized in that Along the first direction, a distance between a projection of the first adhesive layer in the thickness direction of the substrate layer and a 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 member also includes a third adhesive layer, both sides of which are respectively bonded to the second wall and the substrate layer. The bonding force between the third adhesive layer and the second wall is A, and the bonding 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 when encountering an electrolyte.

8. The battery according to any one of claims 5 to 7, characterized in that The material of the third adhesive layer includes one of acrylic resin glue, epoxy resin glue, and composite resin glue.

9. The battery according to claim 1, characterized in that The material of the first adhesive layer includes one of rubber, polysiloxane glue, polyimide glue and polyurethane glue.

10. The battery according to claim 1, characterized in that 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 .

11. The battery according to claim 1, characterized in that The cavity wall of the storage cavity includes a stacked heat-sealing layer, a metal layer and an outer layer, the heat-sealing layer is provided with a first groove, the flexible adhesive is arranged in the first groove, and the groove wall of the first groove facing the battery cell is the second wall, and / or, the heat-sealing layer is provided with a second groove, the adhesive is arranged in the second groove, and the groove wall of the second groove facing the battery cell is the first wall.

12. Electrical equipment, characterized in that: A battery comprising the battery according to any one of claims 1 to 11.

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