Adapter sheet, battery and electric device

Abstract

The utility model provides an adapter piece, a battery and a power utilization device, and relates to the technical field of batteries. The adapter piece comprises an adapter piece body and extension parts oppositely arranged on the two sides of the adapter piece body in the preset direction, the two extension parts are each provided with an insulating coating, and in the preset direction, the end, away from the adapter piece body, of any extension part is aligned with the end, away from the adapter piece body, of the corresponding insulating coating on the extension part. The probability of battery short circuit fire can be reduced.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and more specifically, to an adapter, a battery, and an electrical device. Background Art

[0002] Square-shell batteries are currently the most widely used lithium-ion batteries. They have the advantages of high energy density, wide application range, and simple production process. However, as the capacity of single cells increases, square-shell batteries become larger and larger, and the battery cover area also increases accordingly.

[0003] When performing a thermal diffusion test on a battery, the excessively high internal temperature of the battery can cause the lower plastic on the top cover to melt, losing its insulation protection. In addition, the thermal diffusion test can also cause the battery to produce gas, which can cause the battery to swell and cause the top cover to bend and deform. The deformed top cover may touch the adapter. Once the top cover touches the adapter, there is a high probability that the battery will short-circuit and catch fire. Utility Model Content

[0004] The purpose of this application includes, for example, providing a switching piece that can reduce the probability of battery short circuit and fire.

[0005] Another object of the present application is to provide a battery that can reduce the probability of short circuit fire.

[0006] The purpose of this application also includes providing an electrical device that can reduce the probability of battery short circuit fire.

[0007] The embodiments of the present application can be implemented as follows:

[0008] An embodiment of the present application provides an adapter plate, which includes an adapter plate main body and extension portions arranged on both sides of the adapter plate main body relative to each other along a preset direction, and both extension portions are provided with an insulating coating. In the preset direction, an end of any extension portion away from the adapter plate main body is aligned with an end of the corresponding insulating coating on the extension portion away from the adapter plate main body.

[0009] Optionally, in the preset direction, the width of the insulating coating is greater than or equal to 1 mm.

[0010] Optionally, the thickness of the insulating coating is greater than or equal to 3 μm.

[0011] Optionally, a welding area is provided on any of the extension portions, and a distance between the insulating coating on any of the extension portions and the welding area is greater than or equal to 1.5 mm.

[0012] Optionally, the insulating coating is mainly made of ceramic material.

[0013] Optionally, the ceramic material is alumina or boehmite.

[0014] Optionally, the insulating coating further includes a binder and additives.

[0015] The present application also provides a battery, comprising the adapter.

[0016] Optionally, the battery further includes a top cover and a pole arranged on the top cover, the pole is welded to the adapter body, the width direction of the top cover is a preset direction, and the insulating coating is at least arranged on the surface of the extension portion facing the top cover.

[0017] The present application also provides an electrical device comprising the battery.

[0018] The adapter, battery, and electrical device provided by the embodiments of the present application have the following beneficial effects: for example, to reduce the probability of battery short circuit fire, an adapter is designed, comprising an adapter body and extensions disposed on opposite sides of the adapter body along a predetermined direction. Both extensions are provided with an insulating coating. In the predetermined direction, the end of each extension distal to the adapter body is aligned with the end of the corresponding insulating coating on the extension distal to the adapter body. When the adapter is placed inside a battery and subjected to a thermal diffusion test, the end of each extension distal to the adapter body is aligned with the end of the corresponding insulating coating on the extension distal to the adapter body, so that the insulating coating covers a portion of the area between the edge of the extension and the adapter body. If the internal temperature of the battery is too high, causing the lower plastic to melt, and the battery generates gas, causing the top cover to bend and deform, the deformed top cover will contact the insulating coating on the extension, effectively preventing the deformed top cover from directly contacting the adapter, thereby reducing the probability of battery short circuit fire. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic structural diagram of the adapter in an embodiment of the present application;

[0021] Figure 2 This is a bottom view of the top cover in the embodiment of the present application;

[0022] Figure 3 This is a top view of the top cover in the embodiment of the present application.

[0023] Icon: 100- adapter; 110- adapter body; 120- extension; 121- insulation coating; 122- welding area; 200- top cover; 210- pole; 220- explosion-proof valve. DETAILED DESCRIPTION

[0024] To make the objectives, technical solutions, and advantages of the embodiments of the present application more clear, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Generally, the components of the embodiments of the present application described and shown in the drawings herein can be arranged and designed in various different configurations.

[0025] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for protection, but merely represents selected embodiments of the present application. All other embodiments obtained by persons of ordinary skill in the art based on the embodiments in the present application without creative work are within the scope of protection of the present application.

[0026] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, it does not need to be further defined or explained in subsequent drawings.

[0027] In the description of this application, it should be noted that if the terms "upper", "lower", "inside", "outside", etc. appear, the orientation or position relationship indicated is based on the orientation or position relationship shown in the accompanying drawings, or is the orientation or position relationship in which the utility model product is usually placed when in use. It is only for the convenience of describing this application and simplifying the description, and does 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, it cannot be understood as a limitation on this application.

[0028] In addition, the terms "first", "second", etc., if used, are merely used to distinguish and describe, and should not be understood as indicating or implying relative importance.

[0029] It should be noted that, in the absence of conflict, the features in the embodiments of this application can be combined with each other.

[0030] The inventors of this application discovered that when a battery is subjected to a thermal diffusion test, excessively high internal temperatures can cause the lower plastic on the top cover to melt, resulting in the loss of insulation protection. Furthermore, the thermal diffusion test can also cause the battery to produce gas, which can cause the battery to swell and, in turn, cause the top cover to bend and deform. The deformed top cover may touch the adapter, and once the top cover touches the adapter, there is a high probability that the battery will short-circuit and catch fire.

[0031] There are currently two solutions to battery short-circuit fires. The first is to use a lower plastic with a higher melting point. However, lower plastics are typically injection molded, and polymers that meet these requirements are very expensive and generally unavailable for mass production. The second solution is to increase the thickness of the top cover or design reinforcing ribs on it. However, since battery casing dimensions are generally fixed, increasing the thickness of the top cover or designing reinforcing ribs on it would occupy the height space inside the battery, resulting in a decrease in battery capacity.

[0032] The embodiments of the present application provide an adapter that can be mass-produced, reduces the probability of battery short circuit fire, and does not cause a decrease in battery capacity.

[0033] Please refer to Figure 1-Figure 3 The adapter 100 provided in the embodiment of the present application includes an adapter body 110 and extensions 120 relatively arranged on both sides of the adapter body 110 along a preset direction x. Both extensions 120 are provided with an insulating coating 121. In the preset direction x, one end of any extension 120 away from the adapter body 110 is aligned with the end of the corresponding insulating coating 121 on the extension 120 away from the adapter body 110.

[0034] It should be pointed out that the adapter plate main body 110 and the two extension parts 120 are integrally formed, and the two extension parts 120 extend in opposite directions in the preset direction x. In the preset direction x, the end of any extension part 120 away from the adapter plate main body 110 is aligned with the end of the corresponding insulating coating 121 on the extension part 120 away from the adapter plate main body 110, so that each insulating coating 121 covers a partial area between the edge of the corresponding extension part 120 and the adapter plate main body 110.

[0035] When the adapter 100 is set inside the battery and then subjected to a heat diffusion test, since the end of any extension 120 away from the adapter body 110 is aligned with the end of the corresponding insulating coating 121 on the extension 120 away from the adapter body 110, the insulating coating 121 covers a portion of the area between the edge of the extension 120 and the adapter body 110. If the temperature inside the battery is too high, causing the lower plastic to melt, and the battery produces gas, causing the top cover 200 to bend and deform, the deformed top cover 200 will contact the insulating coating 121 on the extension 120, and is not likely to directly contact the adapter 100, thereby reducing the probability of battery short circuit and fire. In addition, the cost of setting the insulating coating 121 is low, and mass production is easy to achieve.

[0036] In this embodiment, in the preset direction x, the width a of the insulating coating 121 is greater than or equal to 1 mm.

[0037] By limiting the width of the insulating coating 121 in the preset direction x to be greater than or equal to 1 mm, the deformed top cover 200 can effectively contact the insulating coating 121 to prevent the top cover 200 from directly contacting the adapter 100 .

[0038] Illustratively, in the preset direction x, the width a of the insulating coating 121 is 1 mm, 1.2 mm, or 1.5 mm. It is understandable that the width of the insulating coating 121 in the preset direction x can be selected within the above range according to actual working conditions.

[0039] In this embodiment, the thickness of the insulating coating 121 is greater than or equal to 3 μm.

[0040] The thickness direction of the insulating coating 121 is consistent with the thickness direction of the adapter 100. By limiting the thickness of the insulating coating 121 to be greater than or equal to 3μm, short circuits can be effectively prevented. Moreover, the smaller thickness of the insulating coating 121 does not easily occupy space inside the battery and will not affect the battery capacity.

[0041] Illustratively, the thickness of the insulating coating 121 is 3 μm, 3.5 μm, or 4 μm. It is understandable that the thickness of the insulating coating 121 can be selected within the above range according to actual working conditions.

[0042] In this embodiment, a welding area 122 is provided on any extension portion 120 , and a distance b between the insulating coating 121 on any extension portion 120 and the welding area 122 is greater than or equal to 1.5 mm.

[0043] It should be noted that the welding area 122 is the area reserved for welding the adapter 100 to the tab. A distance needs to be left between the insulating coating 121 on any extension portion 120 and the welding area 122 on the corresponding extension portion 120 to ensure effective welding of the tab.

[0044] Exemplarily, the distance b between the insulating coating 121 on any extension portion 120 and the welding area 122 is 1.5 mm, 2 mm or 2.5 mm. It can be understood that the distance b between the insulating coating 121 on any extension portion 120 and the welding area 122 can be selected within the above range according to actual working conditions.

[0045] Of course, it can be understood that in the preset direction x, the sum of the width a of the insulating coating 121, the distance b between the insulating coating 121 and the welding area 122 on any extension portion 120, and the width of the welding area 122 is less than or equal to the width of the extension portion 120.

[0046] In this embodiment, the insulating coating 121 is mainly made of ceramic material.

[0047] The insulating coating 121 is formed by coating a ceramic material on the extension portion 120 of the adapter 100. This embodiment does not limit the method of coating the ceramic material. For example, the method of coating the ceramic material includes plasma spraying, slurry coating, high-temperature curing and other methods.

[0048] In some embodiments, the ceramic material is alumina or boehmite.

[0049] It should be noted that ceramics are inorganic, non-metallic materials with advantages such as high melting point, high hardness, high wear resistance, and oxidation resistance. Alumina ceramics, in particular, offer excellent refractory properties, high hardness, and high strength. Boehmite, also known as boehmite, has been widely used in ceramics, composite materials, surface protective coatings, optical materials, catalysts and carrier materials, semiconductor materials, and coatings due to its unique chemical, optical, and mechanical properties.

[0050] When alumina or boehmite is used as the ceramic material, alumina or boehmite is generally used as the main material, and the content of alumina or boehmite in the insulating coating 121 should be greater than or equal to 60%.

[0051] In some other embodiments, the ceramic material may be selected from nano-ceramic material, zirconium oxide ceramic material, silicon carbide ceramic material, silicon nitride ceramic material or quartz ceramic material, as long as the insulating coating made of these ceramic materials can effectively prevent the battery from short-circuiting.

[0052] In some embodiments, the insulating coating 121 further includes a binder and additives.

[0053] It should be noted that, depending on the coating method, adhesives or other additives can be added to the insulating coating 121. The adhesives include but are not limited to polyvinylidene fluoride (PVDF), polystyrene butadiene copolymer (SBR) and other materials. The content of the adhesive can be 0%-40% according to the process requirements. The additives can be protective agents, thickeners, plasticizers and other materials that can improve the coating quality or process yield. The content of the additives is 0-10%.

[0054] The present application also provides a battery comprising the aforementioned adapter 100. Furthermore, the battery further comprises a top cover 200 and a terminal 210 disposed on the top cover 200. The terminal 210 is welded to the adapter body 110. The width of the top cover 200 is along a predetermined direction x. An insulating coating 121 is disposed on at least the surface of the extension 120 facing the top cover 200. An explosion-proof valve 220 is also disposed on the top cover 200.

[0055] In this embodiment, two poles 210 are symmetrically arranged on the top cover 200 along its own length direction, and the number of adapter plates 100 is also two. Accordingly, the two adapter plates 100 are symmetrically arranged along the length direction of the top cover 200, and the two poles 210 are respectively welded to the two adapter plate bodies 110.

[0056] The battery also includes a shell and a battery cell arranged in the shell. The top cover 200 is arranged on the top of the shell to encapsulate the battery cell. The electrode tab of the battery cell is welded to the welding area 122 on the extension part 120. The pole 210 is welded to the surface of the adapter body 110 facing the top cover 200. The insulating coating 121 is arranged on the surface of the extension part 120 facing the top cover 200. In this case, the insulating coating 121 is formed by applying a ceramic material to the surface of the extension part 120 facing the top cover 200; or, the insulating coating 121 is simultaneously arranged on the surface of the extension part 120 facing the top cover 200 and the surface away from the top cover 200. In this case, the insulating coating 121 is formed by applying a ceramic material to the upper and lower surfaces of the extension part 120.

[0057] The embodiments of the present application also provide an electrical device including the aforementioned battery. For example, the electrical device may be a vehicle, a ship, a spacecraft, or the like. A vehicle may be a fuel-powered vehicle or a new energy vehicle. A new energy vehicle may be a pure electric vehicle, a hybrid vehicle, or an extended-range vehicle. Spacecraft include aircraft, rockets, space shuttles, and spacecraft. The embodiments of the present application do not impose any particular limitations on the electrical device described above.

[0058] The following examples and comparative examples further illustrate the technical effects achieved by this application:

[0059] Example 1

[0060] In a lithium iron phosphate energy storage battery with a size of 36mm*160mm*500mm and a capacity of 360Ah, an adapter sheet 100 is used with an insulating coating 121 having a width a=1mm, a distance b=1.5mm between the insulating coating 121 and the welding area 122, and an insulating coating 121 having a thickness of 3μm formed by plasma spraying, wherein the insulating coating 121 is a boehmite coating.

[0061] Comparative Example 1

[0062] In a lithium iron phosphate energy storage battery with a size of 36 mm*160 mm*500 mm and a capacity of 360 Ah, an adapter sheet 100 without a boehmite coating is used.

[0063] In accordance with the national standard GB-T38031-2020, the two groups of batteries in Example 1 and Comparative Example 1 were each subjected to 10 thermal diffusion tests. The pass rate of the test results in Comparative Example 1 was 60%. The failed battery pole 210 leaked and ignited, and the spark ignited the combustible material on the surface, causing the battery cell to catch fire and fail the test. When the battery was disassembled, it could be seen that the plastic under the top cover 200 was completely melted, and there was a breakdown hole at the relative position between the edge of the adapter 100 and the top cover 200. The pass rate of the test results in Example 1 was 100%.

[0064] Comparative Example 2

[0065] In a lithium iron phosphate energy storage battery with a size of 36mm*160mm*500mm and a capacity of 360Ah, an adapter sheet 100 is used in which the width a of the insulating coating 121 is 1mm, the distance b between the insulating coating 121 and the welding area 122 is 1.5mm, and the thickness of the insulating coating 121 formed by plasma spraying is 2μm, wherein the insulating coating 121 is a boehmite coating.

[0066] According to the national standard GB-T38031-2020, the two groups of batteries in Example 1 and Comparative Example 2 were each subjected to 10 thermal diffusion tests. The pass rate of the test results in Example 1 was 100%, and the pass rate of the test results in Comparative Example 2 was 80%. The failed battery top cover 200 patch was smoking, but the battery did not catch fire. After tearing off the top cover 200 patch, it can be seen that there is a breakdown hole at the position corresponding to the adapter 100, indicating that the thickness of the insulating coating 121 is too small and may not be dense enough to completely prevent the occurrence of short circuits. Therefore, the solution in Comparative Example 2 cannot be adopted.

[0067] In summary, the embodiments of the present application provide an adapter sheet 100, a battery, and an electrical device. By limiting the width of the insulating coating 121 on the adapter sheet 100, the thickness of the insulating coating 121, the distance between the insulating coating 121 on any extension portion 120 and the welding area 122, and the material of the insulating coating 121, when the adapter sheet 100 provided with the insulating coating 121 is set inside the battery for a thermal diffusion test, the test pass rate of the battery is close to 100%, which greatly reduces the probability of battery short circuit and fire.

[0068] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this application should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. A transfer sheet, characterized in that: The invention comprises an adapter plate body (110) and extensions (120) arranged on both sides of the adapter plate body (110) in a preset direction. Both extensions (120) are provided with an insulating coating (121). In the preset direction, an end of any extension (120) away from the adapter plate body (110) is aligned with an end of the corresponding insulating coating (121) on the extension (120) away from the adapter plate body (110).

2. The adapter according to claim 1, wherein: In the preset direction, the width of the insulating coating (121) is greater than or equal to 1 mm.

3. The adapter according to claim 1, wherein: The thickness of the insulating coating (121) is greater than or equal to 3 μm.

4. The adapter according to claim 1, wherein: A welding area (122) is provided on any of the extension portions (120), and a distance between the insulating coating (121) on any of the extension portions (120) and the welding area (122) is greater than or equal to 1.5 mm.

5. The adapter according to claim 1, wherein: The insulating coating (121) is mainly made of ceramic material.

6. The adapter according to claim 5, characterized in that: The ceramic material is alumina or boehmite.

7. The adapter according to claim 5, characterized in that: The insulating coating (121) further comprises a binder and additives.

8. A battery, characterized in that: Including the adapter sheet according to any one of claims 1 to 7.

9. The battery according to claim 8, characterized in that The battery further comprises a top cover (200) and a pole (210) arranged on the top cover (200), the pole (210) being welded to the adapter plate body (110), the width direction of the top cover (200) being a preset direction, and the insulating coating (121) being arranged at least on a surface of the extension portion (120) facing the top cover (200).

10. An electrical device, characterized in that: A battery comprising the battery according to claim 8 or 9.

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