CN221327897U - Single battery and power utilization device - Google Patents

Abstract

The application discloses a single battery and an electric device, wherein the single battery comprises a shell, a plurality of concave grooves and an insulating layer, and the shell is provided with an inner surface and an outer surface; the concave grooves are arranged on the outer surface, and at least part of the concave grooves have different concave depths; the insulating layer covers the outer surface and is at least partially embedded in the recessed groove. According to the technical scheme, the concave groove is formed on the outer surface of the shell, and then the insulating layer is covered on the outer surface and is partially embedded into the concave groove, so that the adhesive force between the insulating layer and the battery shell can be effectively improved, the long-term high-temperature and high-humidity environment can be tolerated, and the problem that the adhesive force between the insulating layer and the battery shell is unreliable at present is solved.

Description

Single battery and power utilization device

Technical Field

The utility model relates to the technical field of batteries, in particular to a single battery and an electric device.

Background

In the battery production process, an insulating layer is coated or sprayed on the surface of the shell in order to protect the finished battery. The insulating layer not only plays a role in preventing short circuit of the battery, but also can prevent electrochemical corrosion in the processing process from influencing the isolation effect of the shell. However, the problem of poor connection between the insulating layer and the shell exists at present.

Disclosure of utility model

In order to solve the technical problems, the utility model provides a single battery and an electric device.

In a first aspect, the present application provides a single cell comprising:

a housing having an inner surface and an outer surface;

a plurality of concave grooves arranged on the outer surface, at least part of the concave grooves having different concave depths;

And an insulating layer covering the outer surface and at least partially embedded in the concave groove.

Optionally, the ratio of the total area of the plurality of concave grooves to the total area of the outer surface is: 70% -98%.

Optionally, the recess depths of any two adjacent recess grooves are not equal.

Optionally, the recess depth of the recess groove ranges from 1um to 10um.

Optionally, the difference in the recess depth of any adjacent two recess grooves is in the range of 1um to 3um.

Optionally, the shape of the pattern region is at least one of a circle, a square, a diamond, or a hexagon.

Optionally, the device further comprises a top cover, wherein the top cover is connected with the shell and is used for sealing the shell, the surface, away from the shell, of the top cover is provided with a plurality of concave grooves and an insulating layer, and the insulating layer covers the surface, away from the shell, of the top cover and is at least partially embedded into the concave grooves.

Optionally, the outer surface includes a first surface and a second surface that are disposed opposite along a first direction, a third surface and a fourth surface that are disposed opposite along a second direction, and a bottom surface, the first surface and the second surface are respectively connected with the third surface and the fourth surface, and the bottom surface is respectively connected with the first surface, the second surface, the third surface, and the fourth surface, and the recess groove and the insulating layer are disposed on the first surface, the second surface, the third surface, and the fourth surface.

Optionally, the recess groove and the insulating layer are disposed on the bottom surface.

Optionally, the insulating layer is a coating structure.

In a second aspect, the present application also provides an electrical device comprising a cell as described in any one of the first aspects.

The technical scheme provided by the application has the beneficial effects that:

Through forming the indent at the surface of casing, later set up insulating layer in the surface and at least part embedding is in the indent, can improve insulating layer and battery case's adhesive force effectively, can endure long-term high temperature and high humidity environment, solved the unreliable problem of adhesion between insulating layer and the battery case at present.

Drawings

Fig. 1 is a schematic structural view of a housing in a single battery according to the present application;

FIG. 2 is a schematic diagram of a single cell structure of the present application after forming an insulating layer;

FIG. 3 is a schematic diagram showing the distribution of the concave grooves on the first surface of a single battery according to the present application;

FIG. 4 is a schematic view of a partial recess groove of a single cell according to the present application;

FIG. 5 is a schematic view of a portion of a recess in an outer surface of a cell according to the present application;

FIG. 6 is a schematic view of an embodiment of a recess in a cell according to the present application;

FIG. 7 is a schematic view of another embodiment of a recess in a cell according to the present application;

Fig. 8 is a schematic view of a recess in a cell according to another embodiment of the present application.

Reference numerals in the drawings:

10. a housing; 11. an outer surface; 11a, a first surface; 11b, a second surface; 11c, a third surface; 11d, fourth surface; 11e, bottom surface; 12. an inner surface; 20. an insulating layer; 30. a top cover; 40. a concave groove; 50. an overlap region; H. depth of the recess.

Detailed Description

For a clearer understanding of technical features, objects and effects of the present utility model, a detailed description of embodiments of the present utility model will be made with reference to the accompanying drawings. In the following description, it should be understood that the directions or positional relationships indicated by "front", "rear", "upper", "lower", "left", "right", "longitudinal", "transverse", "vertical", "horizontal", "top", "bottom", "inner", "outer", "head", "tail", etc. are configured and operated in specific directions based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present utility model, and do not indicate that the apparatus or element to be referred to must have specific directions, and thus should not be construed as limiting the present utility model.

The following describes in further detail the embodiments of the present utility model with reference to the drawings and examples. The following examples are illustrative of the utility model and are not intended to limit the scope of the utility model.

In the related art, in order to prevent the surface of the battery case from being scratched or short-circuited, an insulating layer is generally provided on the surface of the battery case. At present, two modes of arranging an insulating layer on the surface of a battery shell mainly exist, wherein the first mode is to paste an insulating film layer such as PET (polyethylene terephthalate) on the outer surface of the battery shell after the battery is assembled, air bubbles easily occur in the process of pasting, water vapor easily permeates between the surface of the battery shell and the insulating film, so that the viscosity is reduced, and the insulating film is peeled off; the second mode is to spray insulating paint on the surface of the battery shell to cure the insulating paint to form an insulating layer, and the mode puts higher demands on the cleanliness and the adhesive force of the surface of the battery shell, and if the battery shell is improperly treated, the insulating layer is easily separated after curing. Therefore, the application provides the single battery which can effectively improve the adhesive force between the insulating layer and the surface of the battery shell, and is beneficial to ensuring the comprehensive performance of the single battery.

Referring to fig. 1, 2 and 3, the single battery includes a housing 10, a plurality of concave grooves 40 and an insulating layer 20, the housing 10 has an inner surface 12 and an outer surface 11, the plurality of concave grooves 40 are disposed on the outer surface 11, at least part of the concave grooves 40 have different concave depths, and the insulating layer 20 covers the outer surface and is at least partially embedded into the concave grooves 40. The battery case 10 has a housing chamber for housing the battery cell, and the surface located in the housing chamber is an inner surface 12 and the surface located outside the housing chamber is an outer surface 11.

For example, the housing 10 may be made of a metal material (such as aluminum or copper), or may be made of an alloy material, so as to ensure that the manufactured housing 10 has a better compression resistance, so as to protect the battery cells disposed inside the housing 10. The shape of the case 10 is not particularly limited, and any case commonly used by those skilled in the art is applicable to the present application, but for ease of understanding, the following embodiment will be described by taking the case 10 as a square shape and taking the insulating layer 20 as a spray structure formed by a spray process as an example.

Illustratively, the plurality of concave grooves 40 are formed on the outer surface 11 to increase the roughness of the outer surface 11 of the housing 10, so that the adhesion between the insulating paint and the outer surface 11 is improved after the insulating paint is sprayed on the outer surface 11 of the housing 10, thereby enabling the cured insulating layer 20 to be closely attached to the outer surface 11, which is advantageous for improving the pressure resistance and weather resistance of the insulating layer 20. The recessed groove 40 may be provided on the outer surface 11 by laser cleaning, or by other methods known in the art, and is not limited thereto.

Illustratively, the insulating layer 20 is formed by spraying an insulating paint onto the outer surface 11, and after the insulating paint is cured, the insulating paint mainly serves to reduce the risk of scraping or short-circuiting the surface of the battery case 10. As for the type of insulating paint used, reference may be made to those commonly used in the prior art for insulation of the battery case 10, and this is not limited.

Illustratively, referring to fig. 4 and 5, the concave grooves 40 refer to patterns having different concave depths formed at the outer surface of the case 10 using a device (e.g., a laser device). Since any adjacent concave grooves 40 have different concave depths, the roughness of the region of the outer surface 11 is different, and thus the adhesion between the insulating layer 20 and the battery case 10 can be effectively improved when the insulating paint contacts the outer surface 11 of the case 10. It should be noted that, in the present embodiment, the method of forming the plurality of concave grooves 40 on the outer surface 11 adopts a laser cleaning method, and compared with the conventional method of mechanically polishing, grinding, chemical etching, etc., the arrangement of the plurality of concave grooves 40 on the surface of the housing 10 with a smaller thickness and the housing 10 with easy deformation can be also realized, so as to improve the adhesion between the insulating layer 20 and the housing 10. In addition, prior to the treatment of the outer surface 11 of the housing 10, the housing 10 needs to be clamped by a jig to avoid displacement of the housing 10 during the laser cleaning, resulting in the formation of an insufficient recess 40.

Illustratively, the plurality of the present application means two or more, which need to be selected according to specific actual needs, and this is not limited.

Based on the above technical characteristics, the single battery is characterized in that the concave groove 40 is formed on the outer surface 11 of the housing 10, and then the insulating paint is sprayed on the outer surface 11 to be cured to form the insulating layer 20, so that the insulating layer 20 is arranged on the outer surface 11 and connected with the concave groove 40, the adhesive force between the insulating layer 20 and the battery housing 10 can be effectively improved, the long-term high-temperature and high-humidity environment can be tolerated, and the problem that the adhesive force between the current paint insulating layer and the battery housing 10 is unreliable is solved.

In some embodiments, the ratio of the total area of the plurality of concave troughs 40 to the total area of the outer surface 11 is: 70% -98%. Alternatively, the ratio of the total area of the plurality of concave grooves 40 to the total area of the outer surface 11 may be: any one of 75%, 80%, 85%, 90%, 95%, 98%, or any two ranges of compositions.

Illustratively, the provision of the total area of the plurality of concave grooves 40 to be 70% -98% of the total area of the outer surface 11 is based on the purpose of increasing the roughness of the outer surface 11, so that the roughness of the outer surface 11 can be maintained within a proper range, thereby improving the adhesion of the insulating paint to the outer surface 11 when the insulating paint is sprayed later. If the ratio of the total area of the plurality of concave grooves 40 to the total area of the outer surface 11 is smaller than the above range (for example, only 50%), the outer surface 11 has a larger area where the concave grooves 40 are not provided, so that the adhesion between the portion and the insulating paint is poor, and in a high humidity environment, moisture enters between the insulating layer 20 and the outer surface 11 where the concave grooves 40 are not provided, and detachment of the cured insulating layer 20 is easily caused. In addition, after the outer surface 11 is provided with the plurality of concave grooves 40, the roughness Sa value of the outer surface 11 is 1um to 10um.

In some specific embodiments, at least some of the recess depths H of the recess grooves 40 are different, and it may be that the recess depths H of any two adjacent recess grooves 40 are different, while non-adjacent recess grooves 40 have the same recess depth H; or the recess depth H of any adjacent two recess grooves 40 is the same, while the recess depth H of the other recess grooves 40 adjacent to the recess groove 40 of the same recess depth H is different; the dimensions of the recess depth H of all the recess grooves 40 may be different, and are not limited herein, so long as the height difference is formed on the surface of the housing 10 to increase the roughness of the surface.

In some embodiments, the recess depths H of any adjacent two of the recess grooves 40 are not equal. Wherein, the recess depth H of the recess groove 40 ranges from 1um to 10um. Alternatively, the recess depth H may also be any one value or a range of any two values of 2um, 3um, 4um, 6um, 8um, 9 um.

Illustratively, among the plurality of concave grooves 40 formed in the outer surface 11, the concave depths H of any adjacent two concave grooves 40 are set to be unequal so that the outer surface 11 has a corresponding roughness. Alternatively, the adhesion of the insulating layer 20 to the battery case 10 may be improved by forming a partial overlap region 50 between adjacent concave grooves 40, the depth dimension of the overlap region 50 being greater than the depth dimension of the non-overlap region, such that the roughness of the outer surface 11 is not uniform.

In some embodiments, the difference in the recess depth H of any adjacent two of the recess grooves 40 ranges from 1um to 3um. Illustratively, the difference in the recess depth H based on any adjacent two of the recess grooves 40 is set within the above range in order to avoid an excessive difference in the depth dimension of the partially overlapped region formed between adjacent recess grooves 40, resulting in a non-uniform thickness of the insulating layer 20 formed by applying the insulating coating to the outer surface, or an excessive difference in the adhesion property.

In some embodiments, the shape of the concave trough 40 is at least one of circular, square, diamond, or hexagonal. At least one of the round shape, the square shape, the diamond shape or the hexagonal shape is in a relatively regular shape, so that the processing difficulty is reduced, and the roughness of the shell 10 is well ensured to be in a proper range. It should be noted that the concave groove 40 may be other regular or irregular shapes, and is not limited thereto, and may be selected according to practical needs.

In some specific embodiments, the unit battery further includes a top cover 30, where the top cover 30 is connected to the housing 10 and is used for sealing the housing 10, and a surface of the top cover 30 facing away from the housing 10 is provided with a plurality of concave grooves 40 and an insulating layer 20, and the insulating layer 20 covers the surface of the top cover 30 facing away from the housing 10 and is at least partially embedded into the concave grooves 40. Illustratively, the top cover 30 is attached to the top of the housing 10 such that the interior of the housing 10 is capped by the top cover 30 to provide protection for the cells disposed within the housing 10. In addition, in order to avoid a short circuit after the surface of the top cover 30 is contacted with the external conductive material, it is also necessary to provide an insulating layer 20 on the surface of the top cover 30 facing away from the housing 10 to avoid a short circuit phenomenon.

Because the top cover 30 is provided with the functional element areas such as the pole, the explosion-proof valve, the liquid injection hole, etc., the insulating layer 20 needs to avoid the functional element, the corresponding insulating layer 20 needs to be provided with a through hole, and the distance between the hole wall of the through hole and the functional element is 1-2mm.

In some specific embodiments, the outer surface 11 includes first and second surfaces 11a and 11b disposed opposite each other along the first direction X, third and fourth surfaces 11c and 11d disposed opposite each other along the second direction Y, and a bottom surface 11e, the first and second surfaces 11a and 11b being connected to the third and fourth surfaces 11c and 11d, respectively, and the bottom surface 11e being connected to the first, second, third and fourth surfaces 11a, 11b, 11c and 11d, respectively, the concave groove 40 and the insulating layer 20 being disposed on the first, second, third and fourth surfaces 11a, 11b, 11c and 11 d.

Alternatively, the bottom surface 11e may be provided with the recess 40 and the insulating layer 20.

For example, referring to fig. 2, the outer surface 11 is square by the first surface 11a, the second surface 11b, the third surface 11c, the fourth surface 11d and the bottom surface 11e, and the concave grooves 40 are required to be formed on the first surface 11a, the second surface 11b, the third surface 11c, the fourth surface 11d and the bottom surface 11e, for this purpose, a certain cleaning sequence is required to be followed in the process of forming the concave grooves 40 by laser cleaning, and the specific sequence may be as follows:

Firstly, fixing a shell 10 by using a clamp to enable a first surface 11a to be opposite to a laser head of a laser, then adjusting the size and distance of a light spot of the laser to enable the size of the focused light spot of the laser to be between 0.1mm and 1.5mm and the distance from the outer surface 11 of the shell 10 to be between 5cm and 50cm, starting the laser to enable laser rays emitted by the laser to act on the first surface 11a, controlling the laser rays to clean the first surface 11a from left to right to form a concave groove 40, and cleaning a second surface 11b, a third surface 11c, a fourth surface 11d and a bottom surface 11e respectively after the first surface 11a is cleaned, so that the concave groove 40 is formed on the outer surface 11. The above cleaning sequences are only examples of references and other possible cleaning sequences are equally applicable to the present application.

Application example

A unit cell according to an exemplary embodiment of the present application is described with reference to fig. 1 to 8. It should be noted that the above application scenario is only shown for the convenience of understanding the spirit and principle of the present application, and the embodiments of the present application are not limited in any way. Rather, embodiments of the application may be applied to any scenario where applicable.

As shown in fig. 6, if the recess 40 is circular, the housing 10 is first clamped by a clamp, then the laser is adjusted such that the laser is 8cm away from the outer surface 11 of the housing 10, the focused light spot is 1mm, and then the laser is turned on to make the laser emit laser lines to act on the surface of the housing 10, and the outer surface 11 of the housing 10 is cleaned according to a preset procedure to form the recess 40 having a circular shape. As can be seen from fig. 5, when the first layer of concave grooves 40 is formed, a gap is formed between two adjacent concave grooves 40, so that the second layer of concave grooves 40, the third layer of concave grooves 40 and even more layers of concave grooves 40 are required to be arranged, an overlapping area 50 exists between the concave grooves 40 of different layers, the more the number of overlapped layers is, the deeper the depth dimension of the final concave groove 40 is, the concave grooves 40 of different depths enable the roughness of the surface of the shell 10 to have a better value, and the adhesive force is improved.

As shown in fig. 7, if the recess 40 is square, the housing 10 is first clamped by a clamp, then the laser is adjusted so that the laser is 6cm away from the outer surface 11 of the housing 10, the focused light spot size is 0.8mm, and then the laser is turned on so that the laser emits a laser line to act on the surface of the housing 10, and the outer surface 11 of the housing 10 is cleaned according to a preset procedure to form the square recess 40.

As shown in fig. 8, if the concave groove 40 is in a diamond shape, the housing 10 is first clamped by a clamp, then the laser is adjusted so that the laser is 5cm away from the outer surface 11 of the housing 10, the focused light spot size is 0.6mm, and then the laser is turned on so that the laser emits a laser line to act on the surface of the housing 10, and the outer surface 11 of the housing 10 is cleaned according to a preset procedure to form the diamond concave groove 40.

As an alternative, a test method regarding the recess depth H of the recess groove 40 is provided as follows:

1. Firstly, using organic solvents such as solvent chloroform/acetone and the like to soak for 4-6 hours, and removing the insulating layer 20 on the surface;

2. Wiping the surface of the shell 10 with alcohol, and showing metallic luster after finishing;

3. The surface morphology of the battery cell is observed by using a Kidney 3D measuring instrument vxh-7000 to be 100-1000 times, and then the concave groove 40 on the surface of the aluminum shell can be observed;

4. The case 10 is cut along the thickness direction of the case 10, and the depression depth H of the depression 40 is measured along the cross section using a ruler.

The embodiment of the disclosure also provides electric equipment, which comprises the single battery in the embodiment.

According to the electric equipment disclosed by the embodiment of the disclosure, the single battery is adopted, and the technical effects are consistent with those of the single battery, and are not repeated here.

The foregoing is merely a preferred embodiment of the present utility model, and it should be noted that modifications and substitutions can be made by those skilled in the art without departing from the technical principles of the present utility model, and these modifications and substitutions should also be considered as being within the scope of the present utility model.

Claims (11)

1. A single cell, characterized by comprising:

A housing (10), the housing (10) having an inner surface (12) and an outer surface (11);

a plurality of recessed grooves (40) provided on the outer surface (11), at least some of the recessed grooves (40) having different recessed depths (H);

-an insulating layer (20), said insulating layer (20) covering said outer surface (11) and being at least partially embedded in said recessed groove (40).

2. The unit cell according to claim 1, characterized in that the ratio of the total area of the plurality of concave grooves (40) to the total area of the outer surface (11) is: 70% -98%.

3. The unit cell according to claim 1, characterized in that the recess depths (H) of any adjacent two of the recess grooves (40) are not equal.

4. A cell according to claim 3, wherein the recess depth (H) of the recess groove (40) is in the range of 1um-10um.

5. The unit cell according to claim 1, characterized in that the difference in the recess depth (H) of any adjacent two recess grooves (40) ranges from 1um to 3um.

6. The unit cell according to claim 1, wherein the concave groove (40) has at least one of a circular shape, a square shape, a diamond shape, or a hexagonal shape.

7. The unit cell according to claim 1, further comprising a top cover (30), said top cover (30) being connected to said housing (10) for covering said housing (10), and a surface of said top cover (30) facing away from said housing (10) being provided with said plurality of recess grooves (40) and said insulating layer (20), said insulating layer (20) covering a surface of said top cover (30) facing away from said housing (10) and being at least partially embedded in said recess grooves (40).

8. The unit cell according to claim 1, wherein the outer surface (11) includes a first surface (11 a) and a second surface (11 b) disposed opposite each other along a first direction (X), a third surface (11 c) and a fourth surface (11 d) disposed opposite each other along a second direction (Y), and a bottom surface (11 e), the first surface (11 a) and the second surface (11 b) being connected to the third surface (11 c) and the fourth surface (11 d), respectively, and the bottom surface (11 e) being connected to the first surface (11 a), the second surface (11 b), the third surface (11 c), and the fourth surface (11 d), respectively, the concave groove (40), and the insulating layer (20) being disposed on the first surface (11 a), the second surface (11 b), the third surface (11 c), and the fourth surface (11 d).

9. The unit cell according to claim 8, characterized in that the recess groove (40) and the insulating layer (20) are provided on the bottom surface (11 e).

10. The unit cell according to any one of claims 1-9, characterized in that said insulating layer (20) is a coating structure.

11. An electric device comprising the single cell according to any one of claims 1 to 10.