Single battery and electric device

Abstract

The present application discloses a single battery and an electric device. The single battery comprises a case, a plurality of recesses, and an insulating layer; the recesses are formed on the outer surface of the case; and the insulating layer covers the outer surface and is at least partially embedded into the recesses. According to the present application, the recesses are formed on the outer surface of the case, and the insulating layer covers the outer surface and is at least partially embedded into the recesses, such that the adhesion between the insulating layer and the case of the battery can be effectively improved, and the insulating layer can tolerate a long-term high-temperature and high-humidity environment.

Description

Single battery and power-consuming device

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims the benefit of Chinese Patent Application No. 202322929637.6 filed on October 30, 2023, the entire contents of which are incorporated herein by reference. Technical Field

[0003] The present application relates to the field of battery technology, and in particular to a single cell battery and an electrical device comprising the same. Background Art

[0004] During battery production, an insulating layer is often applied or sprayed onto the battery casing to protect the finished product. This layer not only prevents short circuits but also prevents electrochemical corrosion during processing that could compromise the casing's insulation. However, the connection between the insulating layer and the casing remains weak.

[0005] Application Contents

[0006] In order to solve the above technical problems, the present application provides a single cell battery and an electrical device including the same.

[0007] In a first aspect, the present application provides a single battery, comprising:

[0008] a housing having an inner surface and an outer surface;

[0009] A plurality of recessed grooves are provided on the outer surface, at least some of the recessed grooves having different recessed depths;

[0010] An insulating layer covers the outer surface and is at least partially embedded in the recessed groove.

[0011] Optionally, the ratio of the total area of ​​the plurality of recessed grooves to the total area of ​​the outer surface is 70%-98%.

[0012] Optionally, the roughness value of the outer surface is 1um-10um.

[0013] Optionally, the depths of any two adjacent recessed grooves are not equal.

[0014] Optionally, the depth of the concave groove ranges from 1um to 10um.

[0015] Optionally, any two adjacent concave grooves have the same concave depth, while other concave grooves adjacent to the two adjacent concave grooves have different concave depths.

[0016] Optionally, the depths of all the concave grooves are not equal. Optionally, the difference in the depths of any two adjacent concave grooves ranges from 1 μm to 3 μm.

[0017] Optionally, adjacent recessed grooves partially overlap to form an overlapping area, and a depth dimension of the overlapping area is greater than a depth dimension of the non-overlapping area.

[0018] Optionally, the pattern area is in a shape of at least one of a circle, a square, a diamond or a hexagon.

[0019] Optionally, a top cover is further included, which is connected to the shell and is used to seal the shell, and the surface of the top cover facing away from the shell is provided with the multiple recessed grooves and the insulating layer, and the insulating layer covers the surface of the top cover facing away from the shell and is at least partially embedded in the recessed grooves provided on the surface.

[0020] Optionally, the outer surface includes a first surface and a second surface arranged opposite to each other along a first direction, a third surface and a fourth surface arranged opposite to each other along a second direction, and a bottom surface, the first surface and the second surface are connected to the third surface and the fourth surface respectively, and the bottom surface is connected to the first surface, the second surface, the third surface and the fourth surface respectively, and the recessed groove and the insulating layer are arranged on the first surface, the second surface, the third surface and the fourth surface.

[0021] Optionally, the recessed groove and the insulating layer are arranged on the bottom surface.

[0022] Optionally, the insulating layer is a coating.

[0023] In a second aspect, the present application further provides an electrical device comprising a single cell as described in any one of the first aspects.

[0024] The above technical solution provided by this application has the following beneficial effects:

[0025] By forming a recessed groove on the outer surface of the shell and then arranging the insulating layer on the outer surface and at least partially embedding it into the recessed groove, the adhesion between the insulating layer and the battery shell can be effectively improved, so that the insulating layer can withstand long-term high temperature and high humidity environments, solving the current problem of unreliable adhesion between the insulating layer and the battery shell. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] FIG1 is a schematic structural diagram of a shell in a single cell of the present application;

[0027] FIG2 is a schematic diagram of the structure of a single cell after forming an insulating layer in the present application;

[0028] FIG3 is a schematic diagram showing the distribution of recessed grooves on a first surface of a single cell of the present application;

[0029] FIG4 is a schematic diagram of a partially depressed groove in a single cell of the present application;

[0030] FIG5 is a schematic cross-sectional view of a partially recessed groove on the outer surface of a single cell of the present application;

[0031] FIG6 is a schematic diagram of an embodiment of a recessed groove in a single cell of the present application;

[0032] FIG7 is a schematic diagram of another embodiment of a recessed groove in a single cell of the present application;

[0033] FIG8 is a schematic diagram of another embodiment of a recessed groove in a single cell of the present application.

[0034] Reference numerals in the figure: 10, shell; 11, outer surface; 11a, first surface; 11b, second surface; 11c, third surface; 11d, fourth surface; 11e, bottom surface; 12, inner surface; 20, insulating layer; 30, top cover; 40, recessed groove; 50, overlapping area; H, recessed depth. DETAILED DESCRIPTION

[0035] To provide a clearer understanding of the technical features, objectives, and effects of the present application, specific embodiments of the present application are now described in detail with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by terms such as "front," "back," "up," "down," "left," "right," "longitudinal," "horizontal," "vertical," "horizontal," "top," "bottom," "inside," "outside," "head," and "tail" are based on the directions or positional relationships shown in the accompanying drawings and are constructed and operated in specific directions. These directions are merely for the purpose of facilitating the description of the present technical solution and do not necessarily require the devices or components indicated to have specific directions. Therefore, they should not be construed as limitations on the present application.

[0036] The following embodiments are used to illustrate the present invention, but are not intended to limit the scope of the present invention.

[0037] In the related art, in order to prevent the surface of the battery shell from being scratched or short-circuited, an insulating layer is generally provided on the surface of the battery shell. Currently, there are two main ways to provide an insulating layer on the surface of the battery shell. The first way is to coat the outer surface of the battery shell with an insulating film layer such as PET after the battery is assembled. This method is prone to bubbles during the coating process, and water vapor is easily infiltrated between the surface of the battery shell and the insulating film, resulting in a decrease in viscosity, thereby causing the insulating film to peel off. The second way is to spray an insulating coating on the surface of the battery shell to solidify it to form an insulating layer. This method places higher requirements on the cleanliness and adhesion of the battery shell surface. If the battery shell is not handled properly, it is also easy to cause the cured insulating layer to detach. To this end, the present application provides a single cell battery, which can effectively improve the adhesion between the insulating layer and the surface of the battery shell, which is conducive to ensuring the comprehensive performance of the single cell battery.

[0038] Referring to Figures 1, 2, and 3, the battery cell includes a housing 10, a plurality of recessed grooves 40, and an insulating layer 20. The housing 10 has an inner surface 12 and an outer surface 11. The plurality of recessed grooves 40 are provided on the outer surface 11, with at least some of the recessed grooves 40 having different depths. The insulating layer 20 covers the outer surface 11 and is at least partially embedded in the recessed grooves 40. It should be noted that the battery housing 10 has a cavity for accommodating the battery cell. The surface within the cavity is the inner surface 12, and the surface outside the cavity is the outer surface 11.

[0039] For example, the housing 10 can be made of a metal material (such as aluminum or copper, etc.) or an alloy material. It only needs to ensure that the housing 10 has good pressure resistance to protect the battery cells placed inside the housing 10. In addition, there is no specific limitation on the shape of the housing 10. As long as it is commonly used by those skilled in the art, it is applicable to this application. However, for ease of understanding, the following embodiments are described as an example in which the housing 10 is square, and the insulating layer 20 is an example of a coating formed by a spraying process.

[0040] For example, the purpose of providing the plurality of recessed grooves 40 on the outer surface 11 is to increase the roughness of the outer surface 11 of the housing 10. This improves the adhesion of the insulating coating to the outer surface 11 after it is sprayed onto the outer surface 11 of the housing 10, thereby ensuring that the insulating layer 20 obtained after curing adheres closely to the outer surface 11, thereby improving the pressure resistance and weather resistance of the insulating layer 20. It should be noted that the recessed grooves 40 on the outer surface 11 can be provided by laser cleaning or other methods known in the art, and this is not limited to this.

[0041] Illustratively, the insulating layer 20 is formed by spraying an insulating coating onto the outer surface 11 and curing the insulating coating. This layer primarily serves to reduce the risk of scratches or short circuits on the surface of the battery housing 10. The type of insulating coating used can refer to commonly used insulating coatings for battery housings 10 in the prior art and is not limited thereto.

[0042] For example, with reference to Figures 4 and 5, the recessed groove 40 refers to a pattern with different recessed depths formed on the outer surface 11 of the shell 10 using a device (e.g., a laser device). Since any adjacent recessed grooves 40 have different recessed depths, the outer surface 11 where the recessed grooves 40 are located has a different roughness, thereby effectively improving the adhesion between the formed insulating layer 20 and the battery shell 10 when the insulating coating contacts the outer surface 11 of the shell 10. It should be noted that in this embodiment, a laser cleaning method is used to form a plurality of recessed grooves 40 on the outer surface 11. Compared with the traditional methods of mechanical polishing or chemical etching, it is also possible to arrange a plurality of recessed grooves 40 on the surface of a shell 10 with a smaller thickness and a shell 10 that is easily deformed to improve the adhesion between the insulating layer 20 and the shell 10. In addition, before processing the outer surface 11 of the shell 10, it is necessary to clamp the shell 10 with a fixture to prevent the shell 10 from being displaced during the laser cleaning process, resulting in the formed recessed grooves 40 not meeting the requirements.

[0043] For example, the multiple mentioned in this application refers to two or more, which needs to be selected according to specific actual needs and is not limited to this.

[0044] The single battery based on the above technical features forms a recessed groove 40 on the outer surface 11 of the shell 10, and then sprays an insulating coating onto the outer surface 11 to solidify to form an insulating layer 20, so that the insulating layer 20 is set to the outer surface 11 and connected to the recessed groove 40. This can effectively improve the adhesion between the insulating layer 20 and the battery shell 10, and can withstand long-term high temperature and high humidity environments, solving the current problem of unreliable adhesion between the coating insulating layer and the battery shell 10.

[0045] In some specific embodiments, the ratio of the total area of ​​the plurality of recessed grooves 40 to the total area of ​​the outer surface 11 is 70%-98%. Alternatively, the ratio of the total area of ​​the plurality of recessed grooves 40 to the total area of ​​the outer surface 11 may also be any value among 75%, 80%, 85%, 90%, 95%, 98%, or a range consisting of any two of them.

[0046] For example, the purpose of setting the total area of ​​the plurality of recessed grooves 40 to account for 70%-98% of the total area of ​​the outer surface 11 is to increase the roughness of the outer surface 11 so that the roughness of the outer surface 11 can be maintained within a suitable range, thereby improving the adhesion of the insulating coating to the outer surface 11 when the insulating coating is subsequently sprayed. If the ratio of the total area of ​​the plurality of recessed grooves 40 to the total area of ​​the outer surface 11 is less than the above range (for example, only 50%), a large area of ​​the outer surface 11 without recessed grooves 40 will exist, resulting in poor adhesion to the insulating coating. In high-humidity environments, moisture can enter between the insulating layer 20 and the outer surface 11 without recessed grooves 40, easily causing the insulating layer 20 to detach after curing. In addition, after the plurality of recessed grooves 40 are provided on the outer surface 11, the roughness Sa value of the outer surface 11 is 1 μm-10 μm.

[0047] In some specific embodiments, the recess depths H of at least some of the recessed grooves 40 are different. The recess depths H of any two adjacent recessed grooves 40 may be different, while non-adjacent recessed grooves 40 have the same recess depth H; or the recess depths H of any two adjacent recessed grooves 40 may be the same, while the recess depths H of other recessed grooves 40 adjacent to the two recessed grooves 40 with the same recess depth H may be different; or the recess depths H of all the recessed grooves 40 may be different, which is not limited here, as long as a height difference is formed on the surface of the shell 10 to increase the surface roughness.

[0048] In some specific embodiments, the depths H of any two adjacent recessed grooves 40 are not equal. The recessed depth H of the recessed grooves 40 ranges from 1 μm to 10 μm. Alternatively, the recessed depth H can be any value among 2 μm, 3 μm, 4 μm, 6 μm, 8 μm, and 9 μm, or a range consisting of any two of these values.

[0049] For example, among the multiple recessed grooves 40 formed on the outer surface 11, the recessed depths H of any two adjacent recessed grooves 40 are set to be unequal, so that the outer surface 11 has a corresponding roughness. Alternatively, adjacent recessed grooves 40 can be partially overlapped to form an overlapping area 50, and the depth dimension of the overlapping area 50 is greater than the depth dimension of the non-overlapping area, so that the roughness of the outer surface 11 is inconsistent, thereby improving the adhesion between the insulating layer 20 and the battery case 10.

[0050] In some specific embodiments, the difference in the depth H between any two adjacent recessed grooves 40 is in the range of 1 μm to 3 μm. For example, the difference in the depth H between any two adjacent recessed grooves 40 is set within the above range to avoid excessively large differences in the depth dimensions of the partially overlapping regions formed between adjacent recessed grooves 40, which could result in uneven thickness of the insulating layer 20 formed by the insulating coating applied to the outer surface, or excessively large differences in adhesion properties.

[0051] In some embodiments, the shape of the recessed groove 40 is at least one of a circle, a square, a rhombus, or a hexagon. At least one of the circle, square, rhombus, or hexagon is a relatively regular shape, which reduces processing difficulty and effectively ensures that the roughness of the housing 10 is within an appropriate range. It should be noted that the recessed groove 40 can also have other regular or irregular shapes, which can be selected based on actual needs and are not limited to this.

[0052] In some specific embodiments, the single battery cell further includes a top cover 30, which is connected to the shell 10 and is used to cover the shell 10. The surface of the top cover 30 facing away from the shell 10 is provided with a plurality of recessed grooves 40 and an insulating layer 20. The insulating layer 20 covers the surface of the top cover 30 facing away from the shell 10 and is at least partially embedded in the recessed grooves 40 provided on the surface. Exemplarily, the top cover 30 is connected to the top of the shell 10 so that the interior of the shell 10 is covered by the top cover 30, thereby protecting the battery cells placed inside the shell 10. In addition, in order to prevent a short circuit from occurring when the surface of the top cover 30 comes into contact with an external conductive material, an insulating layer 20 is also required to be provided on the surface of the top cover 30 facing away from the shell 10 to prevent a short circuit.

[0053] It should be noted that since the top cover 30 is provided with functional parts such as poles, explosion-proof valves, and liquid injection holes, the insulating layer 20 needs to be set away from the functional parts, and the corresponding insulating layer 20 needs to be provided with through holes, and the distance between the hole wall and the functional parts is 1-2 mm.

[0054] In some specific embodiments, the outer surface 11 includes a first surface 11a and a second surface 11b arranged opposite to each other along a first direction X, a third surface 11c and a fourth surface 11d arranged opposite to each other along a second direction Y, and a bottom surface 11e. The first surface 11a and the second surface 11b are respectively connected to the third surface 11c and the fourth surface 11d, and the bottom surface 11e is respectively connected to the first surface 11a, the second surface 11b, the third surface 11c and the fourth surface 11d, and the recessed groove 40 and the insulating layer 20 are arranged on the first surface 11a, the second surface 11b, the third surface 11c and the fourth surface 11d.

[0055] Optionally, a recessed groove 40 and an insulating layer 20 may also be provided on the bottom surface 11 e .

[0056] For example, referring to FIG. 2 , the outer surface 11 is formed into a square by a first surface 11a, a second surface 11b, a third surface 11c, a fourth surface 11d, and a bottom surface 11e. Furthermore, recessed grooves 40 need to be provided on the first surface 11a, the second surface 11b, the third surface 11c, the fourth surface 11d, and the bottom surface 11e. Therefore, a certain cleaning sequence needs to be followed during the process of forming the recessed grooves 40 by laser cleaning. The specific sequence can be as follows:

[0057] First, the housing 10 is fixed with a fixture so that the first surface 11a is facing the laser head of the laser. Then, the spot size and distance of the laser are adjusted so that the spot size after focusing the laser is between 0.1mm and 1.5mm, and the distance from the outer surface 11 of the housing 10 is between 5cm and 50cm. Then, the laser is turned on so that the laser beam emitted by the laser acts on the first surface 11a. Then, the laser beam is controlled to clean from left to right on the first surface 11a to form a recessed groove 40. After the first surface 11a is cleaned, the second surface 11b, the third surface 11c, the fourth surface 11d and the bottom surface 11e are cleaned respectively, thereby completing the setting of the recessed groove 40 on the outer surface 11. The above cleaning sequence is only a reference example, and other possible cleaning sequences are also applicable to this application.

[0058] Application Examples

[0059] A single cell according to an exemplary embodiment of the present application is described with reference to Figures 1 to 8 . It should be noted that the application examples herein are provided solely to facilitate understanding of the spirit and principles of the present application, and the embodiments of the present application are not limited in this respect. Rather, the embodiments of the present application can be applied to any applicable scenario.

[0060] As shown in FIG6 , if the recessed grooves 40 are arranged in a circular shape, the housing 10 is first clamped with a fixture. The laser is then adjusted so that the distance between the laser and the outer surface 11 of the housing 10 is 8 cm and the focused spot size is 1 mm. The laser is then turned on so that the laser beam acts on the outer surface of the housing 10. The outer surface 11 of the housing 10 is cleaned according to a preset procedure to form circular recessed grooves 40. As can be seen from FIG5 , when forming the first layer of recessed grooves 40, there is a gap between adjacent recessed grooves 40. Therefore, a second layer of recessed grooves 40, a third layer, or even more layers of recessed grooves 40 are required. There is an overlapping area 50 between the recessed grooves 40 in different layers. The more overlapping layers there are, the deeper the depth of the final recessed grooves 40. The recessed grooves 40 of different depths provide the housing 10 with a better surface roughness value, thereby improving its adhesion.

[0061] As shown in FIG7 , if the recessed groove 40 is arranged in a square shape, the housing 10 is first clamped by a clamp, and then the laser is adjusted so that the distance between the laser and the outer surface 11 of the housing 10 is 6 cm, and the size of the focused spot is 0.8 mm. Then, the laser is turned on so that the laser emits a laser line to act on the outer surface of the housing 10, and the outer surface 11 of the housing 10 is cleaned according to a preset procedure to form a square recessed groove 40.

[0062] As shown in FIG8 , if the recessed groove 40 is arranged in a diamond shape, the housing 10 is first clamped by a clamp, and then the laser is adjusted so that the distance between the laser and the outer surface 11 of the housing 10 is 5 cm, and the size of the focused spot is 0.6 mm. Then, the laser is turned on so that the laser emits a laser line to act on the outer surface of the housing 10, and the outer surface 11 of the housing 10 is cleaned according to a preset procedure to form a diamond-shaped recessed groove 40.

[0063] As an optional method, a test method for the depression depth H of the depression groove 40 is provided below:

[0064] 1. First, soak the housing in an organic solvent such as chloroform or acetone for 4-6 hours to remove the insulating layer 20 on the outer surface;

[0065] 2. Use alcohol to wipe the outer surface of the housing 10 until it has a metallic luster.

[0066] 3. Use the KEYENCE 3D measuring instrument VXH-7000 to magnify the battery cell surface to 100-1000 times, and you can see the 40 grooves on the aluminum shell surface;

[0067] 4. Cut the shell 10 along its thickness direction, and use a ruler to measure the depth H of the recessed groove 40 along the cross section.

[0068] An embodiment of the present disclosure further provides an electrical device, comprising the single cell battery in the above embodiment.

[0069] According to the electrical device of the embodiment of the present disclosure, the above-mentioned single battery is used, and the technical effects thereof are consistent with those of the above-mentioned single battery, which will not be described in detail here.

[0070] The above is only a preferred embodiment of the present application. It should be pointed out that for ordinary technicians in this technical field, several improvements and replacements can be made without departing from the technical principles of the present application. These improvements and replacements should also be regarded as the scope of protection of the present application.

Claims

1. A single cell battery, wherein: include: A housing (10), wherein the housing (10) has an inner surface (12) and an outer surface (11); A plurality of recessed grooves (40) are disposed on the outer surface (11), and at least some of the recessed grooves (40) have different recessed depths (H); An insulating layer (20), the insulating layer (20) covers the outer surface (11) and is at least partially embedded in the recessed groove (40).

2. The single cell according to claim 1, wherein: The ratio of the total area of ​​the plurality of recessed grooves (40) to the total area of ​​the outer surface (11) is 70%-98%.

3. The single cell according to claim 1, wherein: The roughness Sa value of the outer surface (11) is 1 um-10 um.

4. The single cell according to claim 1, wherein: The recessed depths (H) of any two adjacent recessed grooves (40) are not equal.

5. The single cell according to claim 4, wherein: The depression depth (H) of the depression groove (40) ranges from 1 um to 10 um.

6. The single cell according to claim 1, wherein: The depression depths (H) of any two adjacent depression grooves (40) are the same, while the depression depths (H) of other depression grooves (40) adjacent to the two adjacent depression grooves (40) are different.

7. The single cell according to claim 1, wherein: The recessed depths (H) of all the recessed grooves (40) are not equal.

8. The single cell according to claim 1, wherein: The difference in the depression depth (H) between any two adjacent depression grooves (40) ranges from 1 um to 3 um.

9. The single cell according to claim 1, wherein: Adjacent recessed grooves (40) partially overlap to form an overlapping area (50), and the depth dimension of the overlapping area (50) is greater than the depth dimension of the non-overlapping area.

10. The single cell according to claim 1, wherein: The shape of the concave groove (40) is at least one of circular, square, rhombus or hexagonal.

11. The single cell according to claim 1, wherein: The invention also comprises a top cover (30), wherein the top cover (30) is connected to the shell (10) and is used to cover the shell (10), and the surface of the top cover (30) facing away from the shell (10) is provided with the plurality of recessed grooves (40) and the insulating layer (20), and the insulating layer (20) covers the surface of the top cover (30) facing away from the shell (10) and is at least partially embedded in the recessed grooves (40) provided on the surface.

12. The single cell according to claim 1, wherein: The outer surface (11) comprises a first surface (11a) and a second surface (11b) arranged opposite to each other along a first direction (X), a third surface (11c) and a fourth surface (11d) arranged opposite to each other along a second direction (Y), and a bottom surface (11e); the first surface (11a) and the second surface (11b) are respectively connected to the third surface (11c) and the fourth surface (11d); and the bottom surface (11e) is respectively connected to the first surface (11a), the second surface (11b), the third surface (11c) and the fourth surface (11d); the recessed groove (40) and the insulating layer (20) are arranged on the first surface (11a), the second surface (11b), the third surface (11c) and the fourth surface (11d).

13. The single cell according to claim 8, wherein: The recessed groove (40) and the insulating layer (20) are arranged on the bottom surface (11e).

14. The single cell according to any one of claims 1 to 13, wherein: The insulating layer (20) is a coating.

15. An electrical device, wherein: The electric device comprises the single battery according to any one of claims 1 to 14.

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