Battery packaging structure, battery and electric equipment

Abstract

The utility model belongs to the technical field of batteries, and particularly relates to a battery packaging structure, a battery and electric equipment, the battery packaging structure comprises a packaging body, an accommodating cavity is arranged in the packaging body, an edge sealing part is formed on the edge of the packaging body, a pressure relief area is arranged on the edge sealing part, and the pressure relief area is arranged along the width direction of the edge sealing part. The pressure relief area comprises a non-bonding area and a bonding area which are adjacent to each other, the non-bonding area is located on one side, close to the containing cavity, of the edge sealing part, and the width of the bonding area is smaller than that of the edge sealing part; the edge sealing part can effectively form a weak area in the bonding area, and when the battery is subjected to thermal runaway, the bonding area can be broken firstly to release pressure in the battery, so that electrolyte and inflammable gas in the battery can be discharged in time, heat is prevented from being continuously accumulated in the battery, negative effects generated during thermal runaway of the battery are reduced, and the service life of the battery is prolonged. And combustion or explosion of the battery during thermal runaway is prevented, so that the safety of the battery is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of batteries, and specifically relates to a battery packaging structure, a battery and an electrical device. Background Art

[0002] As a new type of secondary battery, lithium-ion battery has the advantages of high energy density and power density, high operating voltage, light weight, small size, long cycle life, good safety, and green environmental protection. It has broad application prospects in portable appliances, power tools, large-scale energy storage, electric transportation power supply, etc.

[0003] At present, soft-pack batteries are usually not equipped with pressure relief valves. In actual use, when a soft-pack battery experiences thermal runaway, its internal temperature will rise rapidly, causing the electrolyte to decompose and produce a large amount of gas. The aluminum-plastic film will swell, and when the pressure reaches a certain value, the edge of the aluminum-plastic film will rupture and exhaust gas, causing electrolyte leakage, causing the soft-pack battery to burn and explode, and creating safety hazards. Utility Model Content

[0004] The purpose of the utility model is to provide a battery packaging structure to address the deficiencies of the prior art, so as to solve the problem in the prior art that when a soft-pack battery has thermal runaway, the internal temperature rises, causing the electrolyte to decompose and generate a large amount of gas, causing the aluminum-plastic film to swell and eventually rupture to exhaust gas, resulting in electrolyte leakage and battery combustion and explosion.

[0005] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0006] A battery packaging structure includes a packaging body, wherein a accommodating cavity is arranged in the packaging body, a sealing edge is formed at the edge of the packaging body, a pressure relief zone is arranged on the sealing edge, and along the width direction of the sealing edge, the pressure relief zone includes adjacent non-bonded areas and bonded areas, and the non-bonded area is located on a side of the sealing edge close to the accommodating cavity, wherein the width of the bonding area is smaller than the width of the sealing edge.

[0007] Preferably, a plurality of the pressure relief areas are provided, and the plurality of the pressure relief areas are arranged at intervals on the edge sealing portion.

[0008] Preferably, the widths of the bonding areas corresponding to different pressure relief areas are different.

[0009] Preferably, the edge sealing portion includes a top sealing portion and a side sealing portion connected to the top sealing portion, and along the length direction of the packaging body, the top sealing portion is located at at least one end of the packaging body, and along the width direction of the packaging body, the side sealing portion is located on both sides of the packaging body, and at least one pressure relief zone is provided on the top sealing portion and / or the side sealing portion.

[0010] Preferably, along the thickness direction of the packaging body, the orthographic projection of the unbonded area on the edge sealing portion is in the shape of an arc, a triangle, a rectangle or a trapezoid.

[0011] Preferably, the actual width of the unbonded area is H, and the designed width of the unbonded area is H1, satisfying the relationship: H=H1-f, wherein f is 0.5-1.5 mm.

[0012] Preferably, along the width direction of the edge sealing portion, an unsealed area is formed between the edge sealing portion and the accommodating cavity.

[0013] Preferably, the melting point of the bonding area is lower than the melting points of other areas of the edge sealing portion.

[0014] Another object of the utility model is to provide a battery, comprising a battery cell and the battery packaging structure described in the foregoing description, wherein the battery cell is arranged in the accommodating cavity, and the battery cell has a first pole ear and a second pole ear with opposite polarities, and the first pole ear and the second pole ear are arranged at the same end of the battery cell, or the first pole ear is arranged at one end of the battery cell, and the second pole ear is arranged at the other end of the battery cell.

[0015] Another object of the present invention is to provide an electrical device, comprising the battery described above in the specification.

[0016] The beneficial effect of the utility model is that the battery packaging structure of the utility model is formed at the edge of the packaging body through the cooperation of the packaging body and the edge sealing part. The edge sealing part is provided with a pressure relief area, and the pressure relief area includes an unbonded area and a bonded area. The width of the bonded area is smaller than the width of the edge sealing part, so that the edge sealing part can effectively form a weak area in the bonded area. When the battery has thermal runaway, the bonded area can be broken first to release the pressure inside the battery, so that the electrolyte and flammable gas inside the battery can be discharged in time, and the heat is prevented from continuing to accumulate inside the battery, thereby effectively reducing the thermal runaway temperature of the battery, delaying the thermal runaway time of the battery, reducing the negative impact of the thermal runaway of the battery, and preventing the battery from burning or exploding during thermal runaway, thereby improving the safety of the battery. At the same time, the unbonded area is located on the side of the edge sealing part close to the accommodating cavity, so that when the battery has thermal runaway, it is easier to break from the bonded area, thereby releasing the pressure inside the battery, avoiding battery explosion or rupture, and improving the safety of the battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The features, advantages and technical effects of exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.

[0018] Figure 1 It is a structural schematic diagram of the battery of the utility model.

[0019] Figure 2It is a structural schematic diagram of the edge sealing part of the utility model.

[0020] The reference numerals are described as follows:

[0021] 100. Battery;

[0022] 10. Battery packaging structure; 11. Packaging body; 111. Accommodating cavity; 12. Edge sealing portion; 121. Pressure relief area; 1211. Unbonded area; 1212. Bonded area; 122. Top sealing portion; 123. Side sealing portion; 124. Unsealed area;

[0023] 20. battery cell; 21. first pole ear; 22. second pole ear;

[0024] a, length direction of the package body; b, width direction of the package body; c, width direction of the edge sealing portion; d, width of the bonding area; e, width of the edge sealing portion. DETAILED DESCRIPTION

[0025] For example, certain words are used in the specification and claims to refer to specific components. Those skilled in the art should understand that hardware manufacturers may use different terms to refer to the same component. This specification and claims do not use differences in names as a way to distinguish components, but use differences in the functions of components as the criteria for distinction. For example, "including" mentioned throughout the specification and claims is an open term, so it should be interpreted as "including but not limited to". "Approximately" means that within an acceptable error range, those skilled in the art can solve technical problems within a certain error range and basically achieve technical effects.

[0026] Furthermore, the terms “first”, “second”, etc. are used for descriptive purposes only and are not to be understood as indicating or implying relative importance.

[0027] In the utility model, unless otherwise clearly specified and limited, the terms "install", "connect", "connect", "fix" and the like should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be an indirect connection through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the utility model can be understood according to the specific circumstances.

[0028] The following is combined with Figures 1-2 The utility model is further described in detail, but it is not intended to limit the utility model.

[0029] The electric device of the embodiment of the utility model includes a battery 100. The electric device can be a car, a mobile phone, a portable device, a laptop computer, a ship, a spacecraft, an electric toy, an electric tool, etc. The car can be a fuel car, a gas car or a new energy car, and the new energy car can be a pure electric car, a hybrid car or an extended-range car, etc.; the spacecraft includes an airplane, a rocket, a space shuttle and a spacecraft, etc.; the electric toy includes a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy and an electric airplane toy, etc.; the electric tool includes a metal cutting electric tool, a grinding electric tool, an assembly electric tool and a railway electric tool, for example, an electric drill, an electric grinder, an electric wrench, an electric screwdriver, an electric hammer, an impact drill, a concrete vibrator and an electric planer, etc. The embodiment of the present application does not impose any special restrictions on the above-mentioned electric devices.

[0030] See also Figure 1 The battery 100 of the embodiment of the utility model includes a battery cell 20 and a battery packaging structure 10 , and the battery cell 20 is arranged in the accommodating cavity 111 .

[0031] Specifically, the battery cell 20 has a first pole tab 21 and a second pole tab 22 with opposite polarities, the first pole tab 21 and the second pole tab 22 are arranged at the same end of the battery cell 20, or the first pole tab 21 is arranged at one end of the battery cell 20, and the second pole tab 22 is arranged at the other end of the battery cell 20.

[0032] See also Figures 1-2 The battery packaging structure 10 of the embodiment of the utility model includes a packaging body 11, wherein a accommodating cavity 111 is arranged in the packaging body 11, and a sealing edge portion 12 is formed at the edge of the packaging body 11, and a pressure relief area 121 is arranged on the sealing edge portion 12. Along the width direction c of the sealing edge portion 12, the pressure relief area 121 includes adjacent unbonded areas 1211 and bonded areas 1212, and the unbonded areas 1211 are located on a side of the sealing edge portion 12 close to the accommodating cavity 111, wherein a width d of the bonding area 1212 is smaller than a width e of the sealing edge portion 12.

[0033] Compared with the prior art, the battery packaging structure 10 of the embodiment of the utility model, through the coordinated use of the packaging body 11 and the edge sealing part 12, the edge sealing part 12 is formed at the edge of the packaging body 11, and a pressure relief area 121 is provided on the edge sealing part 12, and the pressure relief area 121 includes a non-bonded area 1211 and a bonded area 1212, and the width d of the bonded area 1212 is smaller than the width e of the edge sealing part 12, so that the edge sealing part 12 can effectively form a weak area in the bonded area 1212, when the battery 100 has thermal runaway, the bonded area 1212 can be ruptured first to release the pressure inside the battery 100, so that the electrolyte and flammable gas inside the battery 100 can be discharged in time, preventing heat from continuing to accumulate inside the battery 100, thereby effectively reducing the thermal runaway temperature of the battery 100, delaying the thermal runaway time of the battery 100, reducing the negative impact of the thermal runaway of the battery 100, and preventing the battery 100 from burning or exploding during thermal runaway, thereby improving the safety of the battery 100. At the same time, the unbonded area 1211 is located on the side of the edge sealing portion 12 close to the accommodating cavity 111, so that when the battery 100 has thermal runaway, it is easier to break from the bonding area 1212, thereby releasing the pressure inside the battery 100, avoiding the battery 100 from exploding or breaking, and improving the safety of the battery 100.

[0034] In some embodiments, the width d of the adhesive area 1212 is 1 to 3 mm. Specifically, the width d of the adhesive area 1212 is 1 to 1.4 mm, 1.4 to 1.8 mm, 1.8 to 2.2 mm, 2.2 to 2.6 mm, or 2.6 to 3 mm. For example, the width d of the adhesive area 1212 is 1 mm, 1.5 mm, 1.9 mm, 2 mm, 2.5 mm, 2.8 mm, or 3 mm, but is not limited to the listed values, and other values ​​within the numerical range are also applicable.

[0035] In some embodiments, a plurality of pressure relief areas 121 are provided, and the plurality of pressure relief areas 121 are arranged at intervals on the edge sealing portion 12. By providing a plurality of pressure relief areas 121, the safety of the battery 100 is effectively increased. When the battery 100 has thermal runaway, any weak area may rupture first, thereby releasing the internal pressure and preventing the battery 100 from exploding or rupturing.

[0036] Furthermore, different pressure relief areas 121 correspond to different widths d of the adhesive areas 1212. By setting the width d of the adhesive areas 1212, under different pressure conditions, different adhesive areas 1212 can be broken in a preset order, so that the pressure inside the battery 100 can be gradually released, and a graded flame retardant design of the battery 100 can be achieved, thereby forming a multi-level protection for the battery 100, making the battery 100 more controllable when broken, and reducing the impact of the battery 100 on the surrounding environment and personnel when it is thermally runaway to a certain extent.

[0037] In some embodiments, the edge sealing portion 12 includes a top sealing portion 122 and a side sealing portion 123 connected to the top sealing portion 122. The top sealing portion 122 is located at at least one end of the packaging body 11 along the length direction a of the packaging body 11, and the side sealing portions 123 are located on both sides of the packaging body 11 along the width direction b of the packaging body 11, and at least one pressure relief area 121 is provided on the top sealing portion 122 and / or the side sealing portion 123. Through the coordinated use of the top sealing portion 122 and the side sealing portion 123, the edge of the packaging body 11 can be sealed by the top sealing portion 122 and the side sealing portion 123, so as to form a receiving cavity 111 inside the packaging body 11, thereby effectively ensuring the sealing effect of the packaging body 11. At the same time, by providing at least one pressure relief area 121 on the top seal portion 122 and / or the side seal portion 123, when the battery 100 has thermal runaway, the adhesive area 1212 can be ruptured first to release the pressure inside the battery 100, thereby preventing the battery 100 from exploding or rupturing.

[0038] In some embodiments, along the thickness direction of the package body 11, the orthographic projection of the unbonded area 1211 on the edge sealing portion 12 is in the shape of an arc, a triangle, a rectangle or a trapezoid. Preferably, the orthographic projection of the unbonded area 1211 on the edge sealing portion 12 is in the shape of an arc. The arc shape can concentrate the gas generated when the battery 100 is in thermal runaway at a certain position, which can effectively shorten the rupture time of the bonding area 1212.

[0039] In some embodiments, the actual width of the unbonded area 1211 is H, and the designed width of the unbonded area 1211 is H1, satisfying the relationship, H = H1-f, wherein f is 0.5 to 1.5 mm. By setting the actual width H and the designed width H1 of the unbonded area 1211, during the packaging process of the battery 100, the glue layer of the edge sealing portion 12 softens and has a certain fluidity, so that after the battery 100 is packaged, the actual width H of the unbonded area 1211 is less than the designed width H1 of the unbonded area 1211. Therefore, in order to ensure that the bonding area 1212 can be broken in time when the battery 100 has thermal runaway, it is necessary to increase the designed width of the unbonded area 1211.

[0040] Further, the design width H1 of the unbonded area 1211 is 3 to 6 mm. Specifically, the design width H1 of the unbonded area 1211 is 3 to 3.6 mm, 3.6 to 4.2 mm, 4.2 to 4.8 mm, 4.8 to 5.4 mm, or 5.4 to 6 mm. For example, the design width H1 of the unbonded area 1211 is 3 mm, 3.2 mm, 3.8 mm, 4 mm, 4.6 mm, 5 mm, 5.2 mm, or 6 mm, but is not limited to the listed values, and other values ​​within the numerical range are also applicable.

[0041] In some embodiments, an unsealed area 124 is formed between the edge sealing portion 12 and the accommodating cavity 111. By providing the unsealed area 124, during the packaging process of the battery 100, the unsealed area 124 can isolate the edge sealing portion 12 and the battery cell 20 to prevent the battery cell 20 from being burned, and at the same time can reduce the corrosion chance of the edge sealing portion 12 and facilitate the folding of the edge sealing portion 12.

[0042] In some embodiments, the melting point of the adhesive area 1212 is lower than the melting points of other areas of the edge sealing portion 12. When the battery 100 experiences thermal runaway, the adhesive area 1212 will melt and rupture first due to its lower melting point, so that the electrolyte and flammable gas inside the battery 100 can be discharged in time, preventing the battery 100 from exploding or rupturing, and further ensuring the safety of the battery 100.

[0043] In some embodiments, the edge sealing portion 12 may form a pressure relief bag in the unbonded area 1211, and an adhesive may be filled in the pressure relief bag to bond the unbonded area 1211. The melting points of the adhesive and the bonding area 1212 are both lower than the melting points of other areas of the edge sealing portion 12, and the melting point of the adhesive is lower than the melting point of the bonding area 1212. While effectively ensuring the packaging effect of the battery 100, the adhesive and the bonding area 1212 may be melted and ruptured first when the battery 100 has thermal runaway due to their low melting points, so that the electrolyte and flammable gas inside the battery 100 can be discharged in time, preventing the battery 100 from exploding or rupturing, and further ensuring the safety of the battery 100.

[0044] According to the disclosure and teaching of the above description, the technicians in the field of the utility model can also change and modify the above implementation. Therefore, the utility model is not limited to the above specific implementation, and any obvious improvement, replacement or modification made by the technicians in this field on the basis of the utility model belongs to the protection scope of the utility model. In addition, although some specific terms are used in this specification, these terms are only for the convenience of explanation and do not constitute any limitation to the utility model.

Claims

1. A battery packaging structure, characterized in that: The invention comprises a packaging body (11), wherein a receiving cavity (111) is arranged in the packaging body (11), and an edge sealing portion (12) is formed at the edge of the packaging body (11), and a pressure relief zone (121) is arranged on the edge sealing portion (12), and along the width direction (c) of the edge sealing portion (12), the pressure relief zone (121) comprises adjacent non-bonded areas (1211) and bonded areas (1212), and the non-bonded areas (1211) are located on a side of the edge sealing portion (12) close to the receiving cavity (111), wherein the width (d) of the bonded area (1212) is smaller than the width (e) of the edge sealing portion (12).

2. The battery packaging structure according to claim 1, characterized in that: A plurality of the pressure relief areas (121) are provided, and the plurality of the pressure relief areas (121) are arranged at intervals on the edge sealing portion (12).

3. The battery packaging structure according to claim 2, characterized in that: The widths of the bonding areas (1212) corresponding to different pressure relief areas (121) are different.

4. The battery packaging structure according to claim 2, characterized in that: The edge sealing portion (12) comprises a top sealing portion (122) and a side sealing portion (123) connected to the top sealing portion (122); along the length direction (a) of the packaging body (11), the top sealing portion (122) is located at at least one end of the packaging body (11); along the width direction (b) of the packaging body (11), the side sealing portions (123) are located on both sides of the packaging body (11); and at least one pressure relief zone (121) is provided on the top sealing portion (122) and / or the side sealing portion (123).

5. The battery packaging structure according to any one of claims 1 to 4, characterized in that: Along the thickness direction of the packaging body (11), the orthographic projection of the unbonded area (1211) on the edge sealing portion (12) is in the shape of an arc, a triangle, a rectangle or a trapezoid.

6. The battery packaging structure according to any one of claims 1 to 4, characterized in that: The actual width of the unbonded area (1211) is H, and the designed width of the unbonded area (1211) is H1, which satisfies the relationship: H=H1-f, wherein f is 0.5-1.5 mm.

7. The battery packaging structure according to claim 1, characterized in that: An unsealed area (124) is formed between the edge sealing portion (12) and the accommodating cavity (111).

8. The battery packaging structure according to claim 1, characterized in that: The melting point of the bonding area (1212) is lower than the melting points of other areas of the edge sealing portion (12).

9. A battery, characterized in that: The invention comprises a battery cell (20) and a battery packaging structure according to any one of claims 1 to 8, wherein the battery cell (20) is arranged in the accommodating cavity (111), and the battery cell (20) has a first pole lug (21) and a second pole lug (22) with opposite polarities, and the first pole lug (21) and the second pole lug (22) are arranged at the same end of the battery cell (20), or the first pole lug (21) is arranged at one end of the battery cell (20), and the second pole lug (22) is arranged at the other end of the battery cell (20).

10. Electrical equipment, characterized in that: A battery comprising the battery of claim 9.

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