Battery

Abstract

The utility model discloses a battery which comprises a packaging film provided with a storage cavity; the battery cell is arranged in the storage cavity; the tab is connected to the battery cell, and at least part of the tab is located outside the storage cavity; the tab glue comprises a first bonding layer, a second bonding layer and a heat absorption expansion layer, the heat absorption expansion layer comprises a first surface and a second surface which are oppositely arranged, two sides of the first bonding layer are respectively bonded to the packaging film and the first surface, two sides of the second bonding layer are respectively bonded to the tab and the second surface, and the first surface and the second surface are opposite to each other. Wherein the heat absorption expansion layer can absorb heat and expand. The battery provided by the utility model can have better safety.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to a battery. Background Art

[0002] In the related art, a soft-pack battery includes a packaging film and a battery cell. The battery cell is usually arranged in the packaging film, and the packaging film can generally be an aluminum-plastic film. Soft-pack batteries have the characteristics of small volume and weight. Soft-pack batteries can generally be used in mobile devices, such as mobile phones, tablets, watches and other devices. Furthermore, soft-pack batteries may experience thermal runaway in some cases. Thermal runaway refers to the irreversible thermal reaction of lithium-ion batteries under abnormal conditions, such as overcharging, over-discharging, short circuit, etc., which may eventually lead to serious consequences such as battery explosion and fire. Therefore, it is necessary to propose a battery with better safety. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a battery with better safety.

[0004] A battery according to an embodiment of the utility model includes:

[0005] A packaging film is provided with a storage cavity;

[0006] A battery cell, disposed in the storage cavity;

[0007] A tab connected to the battery cell, at least a portion of the tab being located outside the storage cavity;

[0008] The tab glue comprises a first adhesive layer, a second adhesive layer and a heat-absorbing expansion layer, the heat-absorbing expansion layer comprises a first surface and a second surface arranged opposite to each other, the two sides of the first adhesive layer are respectively bonded to the packaging film and the first surface, the two sides of the second adhesive layer are respectively bonded to the tab and the second surface, wherein the heat-absorbing expansion layer can absorb heat and expand.

[0009] The battery according to the embodiment of the utility model has at least the following beneficial effects: the pole ear glue is located between the pole ear and the packaging film, specifically, the pole ear glue includes a first adhesive layer, a second adhesive layer and a heat-absorbing expansion layer, the two sides of the first adhesive layer are respectively bonded to the packaging film and the first side of the pole ear glue, the two sides of the second adhesive layer are respectively bonded to the pole ear and the second side of the pole ear glue, because the heat-absorbing expansion layer can absorb heat and expand, therefore, when the battery core generates heat, the heat-absorbing expansion layer can absorb the heat inside the battery and expand, after the heat-absorbing expansion layer expands, the heat-absorbing expansion layer will respectively open the first adhesive layer and the second adhesive layer, thereby forming an exhaust channel at the connection between the heat-absorbing expansion layer and the first adhesive layer, and forming an exhaust channel at the connection between the heat-absorbing expansion layer and the second adhesive layer, the exhaust channel can discharge the heat inside the battery, thereby effectively avoiding the explosion of the battery. In this way, the battery can have better safety.

[0010] According to the battery of some embodiments of the present invention, the material of the heat absorption and expansion layer is a phase change heat absorption material.

[0011] According to the batteries of some embodiments of the utility model, two tab glues are provided, and the two tab glues are respectively provided on both sides of the tab.

[0012] According to some embodiments of the battery of the present invention, the heat absorption expansion layer includes a main body and a protruding portion, the protruding portion is connected to one end of the main body and protrudes relative to the main body, the protruding portion is located in the storage cavity, and the main body is provided with the first surface and the second surface.

[0013] According to some embodiments of the battery of the present invention, along the length direction of the pole ear, the length of the first adhesive layer is L1, the length of the heat absorption expansion layer is L2, the length of the second adhesive layer is L3, and L1=L2=L3.

[0014] According to some embodiments of the battery of the present invention, along the width direction of the electrode tab, the length of the first adhesive layer is L4, the length of the heat absorption expansion layer is L5, and 1 / 2≤L5 / L4≤1.

[0015] According to some embodiments of the battery of the present invention, along the width direction of the tab, the length of the first adhesive layer is L4, the length of the second adhesive layer is L6, 1 / 3≤L4 / L6≤1, or 1 / 3≤L6 / L4≤1.

[0016] According to some embodiments of the battery of the present invention, along the length direction of the pole ear, the length of the first adhesive layer is L1, 2mm≤L1≤2.5mm.

[0017] According to some embodiments of the battery of the present invention, along the width direction of the pole ear, the length of the first adhesive layer is L4, and 3.5 mm≤L4≤5 mm.

[0018] According to some embodiments of the battery of the present invention, along the thickness direction of the tab, the thickness of the first adhesive layer is L7, 0.5 mm ≤ L7 ≤ 2 mm.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The present invention is further described below with reference to the accompanying drawings and embodiments, wherein:

[0021] Figure 1 A schematic diagram of a battery according to a first embodiment of the present invention;

[0022] Figure 2 A schematic diagram of a battery according to a second embodiment of the present invention;

[0023] Figure 3 is a schematic diagram of a battery according to a third embodiment of the present utility model;

[0024] Figure 4 FIG. 4 is a schematic diagram of a battery according to a fourth embodiment of the present invention.

[0025] Reference numerals:

[0026] The battery 100 , the packaging film 200 , the battery cell 300 , the tab 400 , the tab glue 500 , the first adhesive layer 510 , the second adhesive layer 520 , the heat-absorbing expansion layer 530 , the main body 531 , and the protrusion 532 . DETAILED DESCRIPTION

[0027] The embodiments of the present invention are described in detail below, and 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 only used to explain the present invention, and cannot be understood as limiting the present invention.

[0028] In the description of the present invention, it should be understood that descriptions involving orientation, 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, and 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, and therefore cannot be understood as a limitation on the present invention.

[0029] In the description of the present utility model, "several" means more than one, "many" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used to distinguish the technical features, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0030] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. 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.

[0031] In the description of the utility model, the description with reference to the terms "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 utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0032] Please refer to Figures 1 to 4In some embodiments, the battery 100 includes: a packaging film 200, a battery cell 300, a tab 400 and a tab glue 500. The packaging film 200 is provided with a storage cavity (not shown). The packaging film 200 may be an aluminum-plastic film, which is a composite soft packaging shell material for encapsulating the battery cell 300 and is commonly used in the soft-pack battery 100. The aluminum-plastic film is composed of an outer nylon layer (ON), an intermediate aluminum foil layer (AL), and an inner heat-sealing layer (CPP or PP), and the layers are pressed and bonded by an adhesive. The main function of the aluminum-plastic film is to seal the battery 100 by the aluminum-plastic film after the battery cell 300 is assembled, thereby protecting the internal battery cell 300. The aluminum-plastic film has high barrier properties, good heat sealing properties, resistance to electrolyte and strong acid corrosion, good ductility, flexibility and mechanical strength. It should be noted that the storage cavity can be formed by stamping the aluminum-plastic film. The battery cell 300 is arranged in the storage cavity. The battery cell 300 can be formed by winding or laminating the electrode sheets. The winding process is specifically to stack the positive electrode sheet, the separator and the negative electrode sheet, and then take one end of the positive electrode sheet, the separator and the negative electrode sheet as the starting point to wind them, and then form a winding core. The lamination process is specifically to stack the positive electrode sheet, the separator and the negative electrode sheet in sequence to form the battery cell 300. The pole ear 400 is connected to the battery cell 300, and at least part of the pole ear 400 is located outside the storage cavity. Among them, the main function of the pole ear 400 is to connect the positive and negative electrodes of the battery 100 to the outside world, so as to build a circuit and realize the transmission and conversion of electric energy. The main function of the pole ear glue 500 is to prevent the pole ear 400 from short-circuiting with the aluminum-plastic film when the battery 100 is packaged, and to prevent leakage by heating and hot-melt sealing with the aluminum-plastic film during packaging. Specifically, the pole ear glue 500 includes a first adhesive layer 510, a second adhesive layer 520 and a heat-absorbing expansion layer 530. The heat-absorbing expansion layer 530 includes a first surface and a second surface that are oppositely arranged. The two sides of the first adhesive layer 510 are respectively bonded to the packaging film 200 and the first surface. The two sides of the second adhesive layer 520 are respectively bonded to the tab 400 and the second surface. The heat-absorbing expansion layer 530 can absorb heat and expand.Specifically, the tab glue 500 is located between the tab 400 and the packaging film 200. Specifically, the tab glue 500 includes a first adhesive layer 510, a second adhesive layer 520 and a heat-absorbing expansion layer 530. The two sides of the first adhesive layer 510 are respectively bonded to the packaging film 200 and the first side of the tab glue 500, and the two sides of the second adhesive layer 520 are respectively bonded to the tab 400 and the second side of the tab glue 500. Since the heat-absorbing expansion layer 530 can absorb heat and expand, when the battery cell 300 generates heat, The heat-absorbing expansion layer 530 can absorb the heat inside the battery 100 and expand. After the heat-absorbing expansion layer 530 expands, the heat-absorbing expansion layer 530 will respectively open the first adhesive layer 510 and the second adhesive layer 520, thereby forming an exhaust channel at the connection between the heat-absorbing expansion layer 530 and the first adhesive layer 510, and forming an exhaust channel at the connection between the heat-absorbing expansion layer 530 and the second adhesive layer 520. The exhaust channel can discharge the heat inside the battery 100, thereby effectively preventing the battery 100 from exploding. In this way, the battery 100 can have better safety.

[0033] It should be noted that when the battery 100 is in normal use (i.e. when thermal runaway does not occur), the two sides of the tab glue 500 are respectively bonded to the tab 400 and the packaging film 200, which can achieve a good sealing of the battery 100, thereby preventing leakage. When the battery 100 has thermal runaway, the design of the heat-absorbing expansion layer 530 can discharge the heat inside the battery 100, thereby effectively preventing the battery 100 from exploding.

[0034] The material of the heat-absorbing expansion layer 530 is introduced below. In some embodiments, the material of the heat-absorbing expansion layer 530 is a phase-change heat-absorbing material. Phase-change heat-absorbing materials are a type of material that can absorb or release a large amount of heat during a phase change process. Common phase-change heat-absorbing materials include: Inorganic phase-change materials: such as crystalline hydrated salts, molten salts, metals or alloys, etc. Organic phase-change materials: such as paraffin, fatty acids, alcohols, polyols, etc. Composite phase-change materials: composed of two or more phase-change materials through physical or chemical methods. Specifically, after the heat-absorbing expansion layer 530 is a phase-change heat-absorbing material, the heat-absorbing expansion layer 530 will expand after absorbing heat, thereby causing the heat-absorbing expansion layer 530 to separate from the first adhesive layer 510 and the second adhesive layer 520, respectively, which can discharge the heat inside the battery 100, thereby effectively preventing the battery 100 from exploding.

[0035] The materials of the first adhesive layer 510 and the second adhesive layer 520 are introduced below, wherein the materials of the first adhesive layer 510 and the second adhesive layer 520 can be PP materials, and further, glue is applied on the PP materials, so that the first adhesive layer 510 and the second adhesive layer 520 are both adhesive. After the first adhesive layer 510 is adhesive, the two sides of the first adhesive layer 510 are respectively bonded to the packaging film 200 and the first surface, and after the second adhesive layer 520 is adhesive, the two sides of the second adhesive layer 520 are respectively bonded to the tab 400 and the second surface. The bonding force of the first adhesive layer 510 and the second adhesive layer 520 can be between 3N and 10N.

[0036] For further information, please refer to Figure 1 In some embodiments, two tab glues 500 are provided, and the two tab glues 500 are respectively provided on both sides of the tab 400. Among them, the two tab glues 500 are respectively located on both sides of the tab 400, and the two tab glues 500 can achieve a good seal between the tab 400 and the packaging film 200. At the same time, the provision of the two tab glues 500 can further effectively prevent the tab 400 from contacting the packaging film 200, thereby causing a short circuit.

[0037] Furthermore, in order to make the heat-absorbing expansion layer 530 absorb the heat of the battery cell 300 at the first time, and in order to make the heat-absorbing expansion layer 530 absorb more heat and expand as soon as possible to form an exhaust channel, the heat contact between the heat-absorbing expansion layer 530 and the inside of the battery cell 300 can be increased. Specifically, in some embodiments, the heat-absorbing expansion layer 530 includes a main body 531 and a protrusion 532, the protrusion 532 is connected to one end of the main body 531, and the protrusion 532 is protruding relative to the main body 531, the protrusion 532 is located in the storage cavity, and the main body 531 is provided with a first surface and a second surface. Among them, the protrusion 532 can protrude in the thickness direction of the main body 531, so that the heat-absorbing expansion layer 530 can form a "T" shape. In addition, the length of the protrusion 532 can be set to be shorter, for example, the length of the main body 531 can be 2mm, and the length of the protrusion 532 is 0.5mm. Specifically, after the protrusion 532 of the heat-absorbing expansion layer 530 absorbs heat, the heat is quickly transferred to the main body 531 , and then the main body 531 expands to form an exhaust channel to eject the heat in the battery cell 300 .

[0038] Furthermore, in some embodiments, the heat-absorbing expansion layer 530 may be fused with the first adhesive layer 510 , thereby ensuring that the heat-absorbing expansion layer 530 can absorb heat better.

[0039] For further information, please refer to Figure 1In some embodiments, along the length direction of the pole tab 400, the length of the first adhesive layer 510 is L1, the length of the heat absorption expansion layer 530 is L2, and the length of the second adhesive layer 520 is L3, and L1=L2=L3. Wherein, along the length direction of the pole tab 400, the length of the first adhesive layer 510 is L1, which specifically means that the size of the first adhesive layer 510 in the length direction of the pole tab 400 is L1. In other words, when the shape of the first adhesive layer 510 is a rectangle, the size of the first adhesive layer 510 in the length direction of the pole tab 400 specifically means that the width of the first adhesive layer 510 is L1. Similarly, along the length direction of the pole tab 400, the length of the second adhesive layer 520 is L3, which specifically means that the size of the second adhesive layer 520 in the length direction of the pole tab 400 is L3. In other words, when the shape of the second adhesive layer 520 is a rectangle, the size of the second adhesive layer 520 in the length direction of the tab 400 specifically refers to the width of the second adhesive layer 520 being L3. Similarly, along the length direction of the tab 400, the length of the heat-absorbing expansion layer 530 being L2 specifically refers to the size of the heat-absorbing expansion layer 530 in the length direction of the tab 400 being L2. In other words, when the shape of the heat-absorbing expansion layer 530 is a rectangle, the size of the heat-absorbing expansion layer 530 in the length direction of the tab 400 specifically refers to the width of the heat-absorbing expansion layer 530 being L2. Among them, when L1=L2=L3, on the one hand, when the battery 100 does not have thermal runaway, L1=L2=L3 can effectively ensure that the sealing of the battery 100 is good; on the other hand, when the battery 100 has thermal runaway, the heat needs to be discharged from the inside of the packaging film 200 to the outside, so the heat discharge direction can be from the storage cavity to the outside, that is, the heat discharge direction is the length direction of the tab 400. The design that the size of the heat-absorbing expansion layer 530 in the length direction of the tab 400 is equal to the size of the first adhesive layer 510 in the length direction of the tab 400 can realize that the heat-absorbing expansion layer 530 completely expands the first adhesive layer 510 and the second adhesive layer 520 in the length direction of the tab 400, thereby facilitating heat discharge. If the dimension of the heat absorption expansion layer 530 in the length direction of the pole ear 400 is smaller than the dimension of the first adhesive layer 510 and the second adhesive layer 520 in the length direction of the pole ear 400, then the heat absorption expansion layer 530 may not be able to completely stretch the first adhesive layer 510 and the second adhesive layer 520, resulting in the heat being unable to be discharged immediately.

[0040] For further information, please refer to Figure 3In some embodiments, along the width direction of the tab 400, the length of the first adhesive layer 510 is L4, the length of the heat-absorbing expansion layer 530 is L5, and 1 / 2≤L5 / L4≤1. In particular, along the width direction of the tab 400, the length of the first adhesive layer 510 is L4, which specifically refers to the size of the first adhesive layer 510 in the width direction of the tab 400 is L4. In other words, when the shape of the first adhesive layer 510 is a rectangle, the size of the first adhesive layer 510 in the width direction of the tab 400 specifically refers to the length of the first adhesive layer 510 is L4. Similarly, along the width direction of the tab 400, the length of the heat-absorbing expansion layer 530 is L5, which specifically refers to the size of the heat-absorbing expansion layer 530 in the width direction of the tab 400 is L5. In other words, when the shape of the heat-absorbing expansion layer 530 is a rectangle, the size of the heat-absorbing expansion layer 530 in the width direction of the tab 400 specifically refers to the length of the heat-absorbing expansion layer 530 is L5. Specifically, the length of the heat-absorbing expansion layer 530 may be half of the length of the first adhesive layer 510, or the length of the heat-absorbing expansion layer 530 may be equal to the length of the first adhesive layer 510. This enables the design of the heat-absorbing expansion layer 530 to be more flexible and facilitates processing and manufacturing.

[0041] For further information, please refer to Figure 3In some embodiments, along the width direction of the pole tab 400, the length of the first adhesive layer 510 is L4, the length of the second adhesive layer 520 is L6, 1 / 3≤L4 / L6≤1, or, 1 / 3≤L6 / L4≤1. Specifically, along the width direction of the pole tab 400, the length of the first adhesive layer 510 is L4, which specifically means that the size of the first adhesive layer 510 in the width direction of the pole tab 400 is L4. In other words, when the shape of the first adhesive layer 510 is a rectangle, the size of the first adhesive layer 510 in the width direction of the pole tab 400 specifically means that the length of the first adhesive layer 510 is L4. Similarly, along the width direction of the pole tab 400, the length of the second adhesive layer 520 is L6, which specifically means that the size of the second adhesive layer 520 in the width direction of the pole tab 400 is L6. In other words, when the shape of the second adhesive layer 520 is a rectangle, the size of the second adhesive layer 520 in the width direction of the tab 400 specifically refers to the size of the length of the second adhesive layer 520 as L6. Specifically, the length of the first adhesive layer 510 may be one-third of the length of the second adhesive layer 520, or the length of the second adhesive layer 520 may be one-third of the length of the first adhesive layer 510. The length of the first adhesive layer 510 may be equal to the length of the second adhesive layer 520. Among them, the length of the first adhesive layer 510 may be equal to the width of the tab 400. In this case, the length of the second adhesive layer 520 may be equal to one-third of the length of the first adhesive layer 510. Similarly, the length of the second adhesive layer 520 may be equal to the width of the tab 400. In this case, the length of the first adhesive layer 510 may be equal to one-third of the length of the second adhesive layer 520, which can save costs.

[0042] For further information, please refer to Figure 1In some embodiments, along the length direction of the tab 400, the length of the first adhesive layer 510 is L1, 2mm≤L1≤2.5mm. Wherein, along the length direction of the tab 400, the length of the first adhesive layer 510 is L1, which specifically means that the size of the first adhesive layer 510 in the length direction of the tab 400 is L1. In other words, when the shape of the first adhesive layer 510 is rectangular, the size of the first adhesive layer 510 in the length direction of the tab 400 specifically refers to the width of the first adhesive layer 510 is L1. Wherein, if the width of the first adhesive layer 510 is too long, for example, the width of the first adhesive layer 510 is greater than 2.5mm, then it will cause waste of materials and lead to excessively high manufacturing costs. If the width of the first adhesive layer 510 is too short, for example, the width of the first adhesive layer 510 is less than 2mm, then the bonding area of ​​the first adhesive layer 510 will be too small, and the sealing of the battery 100 will be poor. It should be noted that, along the length direction of the tab 400 , the length of the first adhesive layer 510 is L1 , the length of the heat-absorbing expansion layer 530 is L2 , and the length of the second adhesive layer 520 is L3 , and L1 = L2 = L3 .

[0043] For further information, please refer to Figure 3 In some embodiments, along the width direction of the tab 400, the length of the first adhesive layer 510 is L4, 3.5mm≤L4≤5mm. Specifically, along the width direction of the tab 400, the length of the first adhesive layer 510 is L4, which specifically refers to that the size of the first adhesive layer 510 in the width direction of the tab 400 is L4. In other words, when the shape of the first adhesive layer 510 is rectangular, the size of the first adhesive layer 510 in the width direction of the tab 400 specifically refers to that the length of the first adhesive layer 510 is L4. If the length of the first adhesive layer 510 is too long, for example, the length of the first adhesive layer 510 is greater than 5mm, then it will cause waste of materials and lead to excessively high manufacturing costs. If the length of the first adhesive layer 510 is too short, for example, the length of the first adhesive layer 510 is less than 3.5mm, then the bonding area of ​​the first adhesive layer 510 will be too small, and the sealing of the battery 100 will be poor. It should be noted that, along the width direction of the tab 400 , the length of the second adhesive layer 520 may be equal to the length of the first adhesive layer 510 .

[0044] For further information, please refer to Figure 4In some embodiments, along the thickness direction of the tab 400, the thickness of the first adhesive layer 510 is L7, 0.5mm≤L7≤2mm. If the thickness of the first adhesive layer 510 is too large, for example, the thickness of the first adhesive layer 510 is greater than 2mm, then it will cause waste of materials, resulting in excessively high manufacturing costs. If the thickness of the first adhesive layer 510 is too small, for example, the thickness of the first adhesive layer 510 is less than 0.5mm, then it will cause the first adhesive layer 510 to be difficult to manufacture, resulting in excessively high manufacturing costs. It should be noted that the thickness of the second adhesive layer 520 can be equal to the thickness of the first adhesive layer 510.

[0045] The embodiments of the utility model are described in detail above in conjunction with the accompanying drawings, but the utility model is not limited to the above embodiments. Various changes can be made within the knowledge of ordinary technicians in the relevant technical field without departing from the purpose of the utility model. In addition, the embodiments of the utility model and the features in the embodiments can be combined with each other without conflict.

Claims

1. A battery, characterized in that include: A packaging film is provided with a storage cavity; A battery cell, disposed in the storage cavity; A tab connected to the battery cell, at least a portion of the tab being located outside the storage cavity; The tab glue comprises a first adhesive layer, a second adhesive layer and a heat-absorbing expansion layer, the heat-absorbing expansion layer comprises a first surface and a second surface arranged opposite to each other, the two sides of the first adhesive layer are respectively bonded to the packaging film and the first surface, the two sides of the second adhesive layer are respectively bonded to the tab and the second surface, wherein the heat-absorbing expansion layer can absorb heat and expand.

2. The battery according to claim 1, characterized in that The material of the heat-absorbing expansion layer is a phase-change heat-absorbing material.

3. The battery according to claim 1, characterized in that Two tab glues are provided, and the two tab glues are respectively provided on both sides of the tab.

4. The battery according to claim 1, characterized in that The heat-absorbing expansion layer includes a main body and a protruding portion, wherein the protruding portion is connected to one end of the main body and protrudes relative to the main body, and is located in the storage cavity. The main body is provided with the first surface and the second surface.

5. The battery according to claim 1, characterized in that Along the length direction of the tab, the length of the first adhesive layer is L1, the length of the heat-absorbing expansion layer is L2, and the length of the second adhesive layer is L3, where L1=L2=L3.

6. The battery according to claim 5, characterized in that Along the width direction of the electrode tab, the length of the first adhesive layer is L4, the length of the heat-absorbing expansion layer is L5, and 1 / 2≤L5 / L4≤1.

7. The battery according to claim 5, characterized in that Along the width direction of the tab, the length of the first adhesive layer is L4, the length of the second adhesive layer is L6, 1 / 3≤L4 / L6≤1, or 1 / 3≤L6 / L4≤1.

8. The battery according to claim 1, characterized in that Along the length direction of the tab, the length of the first adhesive layer is L1, 2mm≤L1≤2.5mm.

9. The battery according to claim 1, characterized in that Along the width direction of the tab, the length of the first adhesive layer is L4, 3.5 mm≤L4≤5 mm.

10. The battery according to claim 1, characterized in that Along the thickness direction of the tab, the thickness of the first adhesive layer is L7, 0.5 mm ≤ L7 ≤ 2 mm.

Images