Battery case, battery cell and battery device

Abstract

The invention discloses a battery shell, a battery monomer and a battery device. The battery shell comprises a shell and an insulating protective layer, the insulating protection layer is arranged on the outer surface of the shell and comprises an insulating layer, an identification code and a transparent protection part, the insulating layer covers at least part of the outer surface of the shell, and the transparent protection part completely covers the identification code. According to the battery shell provided by the embodiment of the invention, the identification code is covered with the transparent protection part, so that a transparent physical barrier layer is formed outside the identification code, the protection effect on the identification code is achieved, the identification code can be prevented from being scratched and even falling off, water vapor and chemicals can be prevented from permeating, the identification code is protected from being eroded, and even if the battery shell is used for a long time, the service life of the battery shell is prolonged. The identification code can still be kept clear, and the traceability requirement of the battery life cycle is met. In addition, the identification code, the transparent protection part and the insulation layer are integrated into the insulation protection layer to cover the outer surface of the shell, so that the insulation protection effect on the battery monomers can be achieved.

Description

Technical Field

[0001] This invention relates to the field of battery technology, and in particular to a battery casing, a battery cell, and a battery device. Background Technology

[0002] In related technologies, identification codes are typically affixed to the outer surface of individual battery cells for recording product information and traceability. However, during assembly, handling, and module integration, these identification codes are easily scratched or even detached, leading to the loss or inability to identify the identification information (such as traceability codes and model numbers). Furthermore, the identification codes are also susceptible to corrosion, rendering the identification information unreadable. Therefore, improvements are needed. Summary of the Invention

[0003] The present invention aims to at least solve one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide a battery casing in which an identification code on the battery casing is covered by a transparent protective portion, which can protect the identification code and keep it clear even after long-term use, thus meeting the traceability requirements of the battery life cycle.

[0004] The present invention also proposes a battery cell having the above-described battery casing.

[0005] The present invention also proposes a battery device having the above-mentioned battery cells.

[0006] According to a first aspect of the present invention, a battery casing includes: a housing; an insulating protective layer disposed on the outer surface of the housing and including an insulating layer, an identification code, and a transparent protective portion, the insulating layer covering at least a portion of the outer surface of the housing, and the transparent protective portion completely covering the identification code.

[0007] According to embodiments of the present invention, the battery casing, by covering the identification code with a transparent protective portion, forms a transparent physical barrier layer on the outside of the identification code, thus protecting the identification code from scratches or even detachment. It also prevents moisture and chemicals from penetrating, protecting the identification code from corrosion. Even after long-term use, the identification code remains clear, meeting the traceability requirements of the battery's lifecycle. Furthermore, integrating the identification code, the transparent protective portion, and the insulating layer into an insulating protective layer covering the outer surface of the casing provides insulation protection for the individual battery cells.

[0008] According to some embodiments of the present invention, the distance between the outer edge of the transparent protective portion and the outer edge of the identification code is in the range of 5mm to 10mm; and / or, the light transmittance of the transparent protective portion is >90%.

[0009] According to some embodiments of the present invention, the hardness of the transparent protective part is in the range of 70HA to 85HA; and / or, the adhesion of the transparent protective part is in the range of 2.0N / cm to 5.0N / cm.

[0010] According to some embodiments of the present invention, the light transmittance of the insulating layer is less than that of the transparent protective portion; and / or, the hardness of the insulating layer is less than that of the transparent protective portion.

[0011] According to some embodiments of the present invention, the thickness of the insulating layer is greater than the thickness of the transparent protective portion.

[0012] According to some embodiments of the present invention, the thickness of the insulating layer is T1, the thickness of the transparent protective portion is T2, and the ratio of T1 to T2 ranges from 5 to 70.

[0013] According to some embodiments of the present invention, the projection of the insulating layer on the outer surface of the housing is a first projection, and the projection of the transparent protective part on the outer surface of the housing is a second projection. The second projection is located within the first projection, and the outer edge of the first projection is spaced apart from the outer edge of the second projection.

[0014] According to some embodiments of the present invention, the housing is cylindrical, the outer surface of the housing includes an outer peripheral surface and two end faces, the two end faces are located on both axial sides of the housing, the identification code and the transparent protective part are both located on the outer peripheral side of the housing, and the insulating layer covers the outer peripheral surface of the housing.

[0015] According to some embodiments of the present invention, the two end faces of the housing are a first end face and a second end face, and the edge of the identification code includes a first edge and a second edge disposed opposite to each other along the axial direction of the housing. The first edge is located on the side of the identification code closer to the first end face, and the second edge is located on the side of the identification code closer to the second end face. The distance between the first edge and the first end face in the axial direction of the housing is d1, and the distance between the second edge and the second end face in the axial direction of the housing is d2. The axial length of the housing is L, and the ratio of d1 to L is greater than 10% and the ratio of d2 to L is greater than 10%.

[0016] According to some embodiments of the present invention, both the insulating layer and the transparent protective portion are resin layers.

[0017] According to some embodiments of the present invention, the insulating layer is an acrylate resin layer and the transparent protective portion is a modified acrylate resin layer; or, the insulating layer is a modified epoxy resin layer and the transparent protective portion is a polyurethane layer.

[0018] According to some embodiments of the present invention, the identification code is disposed on the outer surface of the insulating layer, and the transparent protective portion is disposed on the outer surface of the insulating layer; or, the identification code is disposed on the outer surface of the housing, the transparent protective portion is disposed on the outer surface of the housing, the insulating layer completely covers the transparent protective portion, and the insulating layer is a transparent insulating layer.

[0019] According to some embodiments of the present invention, the insulating layer is an insulating coating, the transparent protective part is a transparent coating; and / or, the identification code is inkjet printing.

[0020] According to some embodiments of the present invention, the insulating layer is an insulating coating and includes a bottom layer and a top layer, wherein the bottom layer is located between the outer surface of the housing and the top layer.

[0021] According to some embodiments of the present invention, the identification code is disposed on the outer surface of the housing, the transparent protective portion is disposed on the outer surface of the housing, the bottom layer is disposed on the outer surface of the housing and completely covers the transparent protective portion, and both the bottom layer and the top layer are transparent layers; or, the identification code is disposed on the outer surface of the bottom layer, the transparent protective portion is disposed on the outer surface of the bottom layer, the top layer is disposed on the outer surface of the bottom layer and completely covers the transparent protective portion, and the top layer is a transparent layer; or, the identification code is disposed on the outer surface of the top layer, and the transparent protective portion is disposed on the outer surface of the top layer.

[0022] A battery cell according to a second aspect of the present invention includes: a battery casing according to the first aspect of the present invention described above; and an electrode assembly disposed within the battery casing.

[0023] According to the battery cell of the present invention, by providing the above-mentioned battery casing, the identification code on the battery casing is covered with a transparent protective part, which can protect the identification code. Even after long-term use, the identification code can still remain clear, meeting the traceability requirements of the battery life cycle.

[0024] A battery device according to a third aspect of the present invention includes: a housing; and a battery cell according to the second aspect of the present invention, wherein the battery cell is disposed in the housing.

[0025] According to the battery device of the present invention, by setting the above-mentioned battery cell, the identification code on the battery casing is covered with a transparent protective part, which can protect the identification code. Even with long-term use, the identification code can still remain clear, meeting the traceability requirements of the battery life cycle.

[0026] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0027] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which: Figure 1 This is a schematic diagram of a battery cell according to some embodiments of the present invention; Figure 2 This is a partial cross-sectional schematic diagram of a battery casing according to some embodiments of the present invention; Figure 3 This is a partial cross-sectional schematic diagram of the battery casing according to other embodiments of the present invention; Figure 4 This is a partial cross-sectional schematic diagram of a battery casing according to some embodiments of the present invention; Figure 5 This is a schematic diagram of a battery device according to some embodiments of the present invention.

[0028] Figure label: 100. Battery cell; 10. Battery casing; 20. Shell; 21. Outer peripheral surface; 22. End face; 221. First end face; 222. Second end face; 30. Insulating protective layer; 31. Insulating layer; 311. Bottom layer; 312. Top layer; 32. Identification code; 321. First edge; 322. Second edge; 33. Transparent protective part; 40. Electrode terminals; 200. Battery assembly; 50. Housing. Detailed Implementation

[0029] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0030] The following is for reference. Figures 1-4 The battery casing 10 according to an embodiment of the present invention is described.

[0031] Reference Figures 1-4According to a first aspect embodiment of the present invention, a battery casing 10 includes a housing 20 and an insulating protective layer 30. The insulating protective layer 30 is disposed on the outer surface of the housing 20 and includes an insulating layer 31, an identification code 32, and a transparent protective portion 33. The insulating layer 31 covers at least a portion of the outer surface of the housing 20. For example, the insulating layer 31 may cover a portion of the outer surface of the housing 20, or it may cover the entire outer surface of the housing 20. By providing the insulating protective layer 30 on the outer surface of the housing 20, short circuits caused by contact between the battery cell 100 having the battery casing 10 and other conductive components can be avoided.

[0032] The insulating layer 31 can be a resin layer, the transparent protective part 33 can also be a resin layer, and the identification code 32 can be formed by printing or spraying. The identification code 32 can be an ink identification code 32.

[0033] The shell 20 can be a metal shell, such as a steel shell, aluminum shell, aluminum alloy shell, or titanium alloy shell. The shape of the shell 20 can be a cuboid, a cylinder, or other shapes.

[0034] The transparent protective part 33 completely covers the identification code 32. While allowing light to pass through, the transparent protective part 33 completely covers the identification code 32, thus protecting it while maintaining visibility from the outside of the battery casing 10. Because the transparent protective part 33 completely covers the identification code 32, a transparent physical barrier layer is formed around it, protecting it from scratches and detachment. It also prevents moisture and chemicals from penetrating, protecting the identification code 32 from corrosion. Even with long-term use, the identification code 32 remains clear, meeting the traceability requirements of the battery's lifecycle.

[0035] According to an embodiment of the present invention, the battery casing 10, by covering the identification code 32 with a transparent protective portion 33, forms a transparent physical barrier layer on the outside of the identification code 32, which protects the identification code 32, preventing it from being scratched or even falling off, and also blocking moisture and chemicals from penetrating, protecting the identification code 32 from corrosion. Even after long-term use, the identification code 32 remains clear, meeting the traceability requirements of the battery life cycle. In addition, integrating the identification code 32, the transparent protective portion 33, and the insulating layer 31 into an insulating protective layer 30 covering the outer surface of the casing 20 can provide insulation protection for the battery cell 100.

[0036] According to some embodiments of the present invention, with reference to Figures 1-4The distance between the outer edge of the transparent protective part 33 and the outer edge of the identification code 32 ranges from 5mm to 10mm. For example, the distance between the outer edge of the transparent protective part 33 and the outer edge of the identification code 32 is b, which can be 5mm, 6mm, 7mm, 8mm, 9mm, 10mm, etc. The outer edge of the identification code 32 refers to the outer contour edge of the entire identification code 32. For example, the outer contour of the entire identification code 32 can be roughly rectangular, and the transparent protective part 33 can also be rectangular.

[0037] By setting the distance between the outer edge of the transparent protective portion 33 and the outer edge of the identification code 32 to a range of 5mm to 10mm, the transparent protective portion 33 can not only completely cover the identification code 32, but also extend beyond the outer edge of the identification code 32. This allows the transparent protective portion 33 to cover areas outside the outer edge of the identification code 32, further reducing the risk of external liquids entering the identification code 32 from its outer edge and eroding it, thus improving the protective effect. Furthermore, by ensuring the distance between the outer edge of the transparent protective portion 33 and the outer edge of the identification code 32 is no greater than 10mm, material waste caused by an excessively large coverage area of ​​the transparent protective portion 33 can be avoided. When the transparent protective portion 33 is formed using a coating method, it also reduces the occurrence of sagging (due to gravity) during the curing process, which can lead to uneven thickness or incomplete curing.

[0038] According to some embodiments of the present invention, the light transmittance of the transparent protective portion 33 is >90%. For example, the light transmittance of the transparent protective portion 33 can be 91%, 92%, 93%, 94%, 95%, 96%, 97%, 98%, 99%, etc. By making the light transmittance of the transparent protective portion 33 >90%, the transparent protective portion 33 can have high transparency and excellent optical transparency, ensuring that the identification code 32 is clearly visible (for example, the identification code 32 covered by the transparent protective portion 33 needs to be recognized by the barcode scanning device), without obscuring or blurring the content of the identification code 32. While covering the identification code 32 with the transparent protective portion 33 to protect the identification code 32, the identification code 32 can be clearly seen and easily identified from the outside.

[0039] It should be noted that when the transparent protective part 33 is formed by spraying, the light transmittance of the transparent protective part 33 refers to the light transmittance after the spraying is cured.

[0040] According to some embodiments of the present invention, the hardness range of the transparent protective part 33 is 70HA to 85HA. For example, the Shore hardness of the transparent protective part 33 can be 70HA, 72HA, 75HA, 78HA, 80HA, 82HA, 85HA, etc. By setting the hardness of the transparent protective part 33 to 70HA to 85HA, the transparent protective part 33 can have better wear resistance and scratch resistance, which can prevent the identification code 32 from being scratched off or blurred (especially since the ink used for the identification code 32 is mostly resin-based, and the identification code 32 itself has weak wear resistance), thereby enabling the transparent protective part 33 to play a more effective protective role for the identification code 32.

[0041] Furthermore, by ensuring that the hardness of the transparent protective part 33 is not less than 70HA, the transparent protective part 33 can have good wear resistance and scratch resistance; by ensuring that the hardness of the transparent protective part 33 is not greater than 85HA, the risk of cracking caused by excessive hardness of the transparent protective part 33 can be avoided.

[0042] It should be noted that when the transparent protective part 33 is formed by spraying, the hardness of the transparent protective part 33 refers to the surface hardness after the spraying is cured.

[0043] According to some embodiments of the present invention, the adhesion force of the transparent protective part 33 ranges from 2.0 N / cm to 5.0 N / cm. For example, the adhesion force of the transparent protective part 33 can be 2.0 N / cm, 2.5 N / cm, 3.0 N / cm, 3.5 N / cm, 4.0 N / cm, 4.5 N / cm, 5.0 N / cm, etc. It should be noted that the adhesion force of the transparent protective part 33 can include the adhesion force of the transparent protective part 33 to the outer surface of the housing 20, and can also include the adhesion force of the transparent protective part 33 to the insulating layer 31. By making By setting the adhesion of the transparent protective part 33 to 2.0 N / cm to 5.0 N / cm, on the one hand, the transparent protective part 33 can be firmly attached to the outer surface of the battery casing 20 and / or the surface of the insulating layer 31, avoiding the exposure of the identification code 32 due to detachment; on the other hand, the transparent protective part 33 is not easy to peel off, forming a sealed protective layer to prevent the identification code 32 from being rubbed or corroded.

[0044] By ensuring that the adhesion of the transparent protective part 33 is not less than 2.0 N / cm, the transparent protective part 33 can be effectively prevented from falling off, thus preventing the identification code 32 from losing its protective function. By ensuring that the adhesion of the transparent protective part 33 is not greater than 5.0 N / cm, the insulation layer 31 can be prevented from being damaged when peeling off the transparent protective part 33, or even from stress concentration in the insulation layer 31, which may lead to cracking of the insulation layer 31 during battery cycling.

[0045] In addition, the adhesion of the transparent protective part 33 to the outer surface of the battery casing 20 and / or the surface of the insulating layer 31 in this application belongs to the linear peeling scenario. For the "linear peeling" scenario such as film and tape (such as the peeling test of the transparent protective part 33 along the width direction), the "adhesion force per unit length" (linear stress) is used as the characterization, with the unit being N / cm, which can intuitively reflect the force intensity along the peeling line.

[0046] According to some embodiments of the present invention, the light transmittance of the insulating layer 31 is less than that of the transparent protective portion 33. By making the light transmittance of the insulating layer 31 less than that of the transparent protective portion 33, the insulating layer 31 can block or reduce the influence of external light on the internal structure of the battery while providing insulation and protection, thereby helping to extend the battery's service life.

[0047] According to some embodiments of the present invention, the hardness of the insulating layer 31 is less than the hardness of the transparent protective portion 33. By making the hardness of the insulating layer 31 less than the hardness of the transparent protective portion 33, the risk of increased brittleness and cracking due to excessive hardness of the insulating layer 31 can be avoided, allowing the insulating layer 31 to provide effective insulation and protection for a long period of time.

[0048] According to some embodiments of the present invention, the thickness of the insulating layer 31 is greater than the thickness of the transparent protective portion 33. By making the thickness of the insulating layer 31 greater than the thickness of the transparent protective portion 33, the insulating layer 31 can better cover the outer surface of the housing 20 to ensure insulation and protection performance.

[0049] For example, the thickness of the insulating layer 31 can range from 60μm to 200μm. For example, the thickness of the insulating layer 31 is T1, and the value of T1 can be 60μm, 80μm, 100μm, 120μm, 140μm, 160μm, 180μm, 200μm, etc.

[0050] According to some embodiments of the present invention, with reference to Figures 1-4 The thickness of the insulating layer 31 is T1, and the thickness of the transparent protective part 33 is T2. The ratio of T1 to T2 ranges from 5 to 70. For example, the ratio of T1 to T2 is 5, 10, 15, 20, 25, 30, 35, 40, 45, 50, 55, 60, 65, 70, etc. By setting the ratio of the thickness of the insulating layer 31 to the thickness of the transparent protective part 33 within the range of 5 to 70, the thickness of the insulating layer 31 can be balanced with thinness and insulation performance, and the transparent protective part 33 can better protect the identification code 32 from wear, scratches, and corrosion.

[0051] The thickness of the insulating layer 31 refers to the thickness of the portion of the insulating layer 31 that directly covers the outer surface of the housing 20.

[0052] The ratio of the thickness of the insulating layer 31 to the thickness of the transparent protective part 33 can be determined according to the application field or scenario of the battery.

[0053] For example, in the field of power batteries, the insulating layer 31 on the outside of the battery casing 10 is subjected to a high-voltage environment, and the thickness of the insulating layer 31 is relatively large. The transparent protective part 33 needs to withstand the frequent friction of the module, and the thickness of the transparent protective part 33 is also relatively large. The ratio of the thickness of the insulating layer 31 to the thickness of the transparent protective part 33 can be in the range of 5 to 50.

[0054] For example, in the field of consumer batteries, the insulating layer 31 on the outside of the battery casing 10 takes into account both thinness and insulation performance. The thickness of the insulating layer 31 is set to be small. The transparent protective part 33 needs to protect the identification code 32 from daily wear and tear. The thickness of the transparent protective part 33 is set to be moderate. The ratio of the thickness of the insulating layer 31 to the thickness of the transparent protective part 33 can be in the range of 5 to 30.

[0055] For example, in high-temperature environments, the insulation layer 31 on the outside of the battery casing 10 needs to withstand high temperatures, and the thickness of the insulation layer 31 is set to be relatively large. The transparent protective part 33 needs to resist electrolyte corrosion, and the thickness of the transparent protective part 33 is set to be relatively large. The ratio of the thickness of the insulation layer 31 to the thickness of the transparent protective part 33 can be in the range of 5 to 70.

[0056] According to some embodiments of the present invention, with reference to Figures 1-4 The projection of the insulating layer 31 on the outer surface of the housing 20 is the first projection, and the projection of the transparent protective part 33 on the outer surface of the housing 20 is the second projection. The second projection is located within the first projection, and the outer edge of the first projection is spaced apart from the outer edge of the second projection.

[0057] According to some embodiments of the present invention, with reference to Figures 1-4 The housing 20 is cylindrical. Its outer surface includes an outer peripheral surface 21 and two end faces 22, located on opposite axial sides. The identification code 32 and the transparent protective portion 33 are both located on the outer peripheral side of the housing 20. An insulating layer 31 covers the outer peripheral surface 21 of the housing 20. By placing the identification code 32 and the transparent protective portion 33 on the outer peripheral side of the housing 20, the larger area of ​​the outer peripheral side facilitates their placement; additionally, this location also facilitates the identification of the identification code 32.

[0058] According to some embodiments of the present invention, with reference to Figures 1-4The housing 20 has two opposing end faces 22 along its axial direction, namely a first end face 221 and a second end face 222. The edge of the identification code 32 includes a first edge 321 and a second edge 322 opposing along the axial direction of the housing 20, wherein the first edge 321 is located on the side of the identification code 32 closer to the first end face 221, and the second edge 322 is located on the side of the identification code 32 closer to the second end face 222. The distance between the first edge 321 of the identification code 32 and the first end face 221 of the housing 20 in the axial direction of the housing 20 is d1, and the distance between the second edge 322 of the identification code 32 and the second end face 222 of the housing 20 in the axial direction of the housing 20 is d2. The axial length of the housing 20 is L, and the ratio of d1 to L is greater than 10%, and the ratio of d2 to L is greater than 10%.

[0059] For example, the ratio of d1 to L can be 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, etc. The ratio of d2 to L can also be 15%, 20%, 25%, 30%, 35%, 40%, 45%, 50%, 55%, 60%, 65%, 70%, 75%, 80%, etc. When the ratio of d1 to L is greater than or equal to 50%, the ratio of d2 to L is less than 50%; when the ratio of d2 to L is greater than or equal to 50%, the ratio of d1 to L is less than 50%; of course, it is also possible for both the ratio of d1 to L to be less than 50% and the ratio of d2 to L to be less than 50%.

[0060] It should be noted that when the identification code 32 is located at the center of the axial direction of the housing 20, the values ​​of d1 and d2 are the same; when the identification code 32 is not located at the center of the axial direction of the housing 20, the values ​​of d1 and d2 are different. The ratio of d1 to L is the first ratio, and the ratio of d2 to L is the second ratio. The sum of the first ratio and the second ratio is less than 100%. Therefore, neither the first ratio nor the second ratio can be greater than or equal to 50%; that is, at least one of the first ratio and the second ratio must be less than 50%.

[0061] It is understandable that the connection position between the end face 22 and the outer peripheral surface 21 of the housing 20 is the welding position. By setting the ratio of the distance d between the edge of the identification code 32 and the end face 22 to the axial length L of the housing 20 to be greater than 10%, the identification code 32 can avoid the weld area of ​​the housing 20 and avoid being affected by the weld area. This allows the identification code 32 to be placed in a flatter area than the weld area, which is beneficial for the clear display of the identification code 32.

[0062] According to some embodiments of the present invention, both the insulating layer 31 and the transparent protective portion 33 are resin layers. By making both the insulating layer 31 and the transparent protective portion 33 resin layers, both the insulating layer 31 and the transparent protective portion 33 can possess good insulation, toughness, and plasticity. Furthermore, both exhibit good chemical and environmental stability.

[0063] For example, a transparent protective part 33 can be formed from a resin that is resistant to high and low temperatures (e.g., -40℃ to 85℃, suitable for battery storage and operating temperatures), humidity (to prevent the identification code 32 from becoming damp and smudged due to water vapor penetration), and chemicals (e.g., to resist corrosion from cleaning agents and trace volatiles in the electrolyte, preventing the identification code 32 from being dissolved).

[0064] The materials used for the insulating layer 31 and the transparent protective part 33 can be the same or similar, or they can be different. When selecting the resin composition for the insulating layer 31 and the transparent protective part 33, it is necessary to ensure that the transparent protective part 33 and the insulating layer 31 do not react. This ensures the transparency, abrasion resistance, and adhesion of the transparent protective part 33, as well as the insulation strength and adhesion of the insulating layer 31.

[0065] In some embodiments of the present invention, the insulating layer 31 is an acrylic resin layer, and the transparent protective portion 33 is a modified acrylic resin layer. For example, the modified acrylic resin layer can be a silicone-modified acrylic resin layer, a modified phenolic epoxy acrylate resin layer, or an epoxy acrylate resin layer. By setting the insulating layer 31 as an acrylic resin layer, the insulating layer 31 can have better insulation performance and better adhesion; by setting the transparent protective portion 33 as a modified acrylic resin layer, the transparent protective portion 33 can have better light transmittance and better adhesion, thereby making the transparent protective portion 33 highly transparent. Furthermore, by setting the insulating layer 31 as an acrylic resin layer and the transparent protective portion 33 as a modified acrylic resin layer, it is possible to avoid a reaction between the insulating layer 31 and the transparent protective portion 33 that could cause the insulating layer 31 or the transparent protective portion 33 to fail.

[0066] In other embodiments of the present invention, the insulating layer 31 is a modified epoxy resin layer, and the transparent protective part 33 is a polyurethane layer. By setting the insulating layer 31 as a modified epoxy resin layer, the insulating layer 31 can have better insulation performance and better adhesion; by setting the transparent protective part 33 as a polyurethane layer, the transparent protective part 33 can have better light transmittance, high weather resistance, and high chemical stability.

[0067] Among them, the modified epoxy resin layer can activate the surface of the epoxy resin layer with plasma to enhance the surface polarity, or add compatibilizers (such as silane coupling agents) into the epoxy resin to ensure that no chemical reaction occurs between the insulating layer 31 and the transparent protective part, while ensuring the interface adhesion.

[0068] According to some embodiments of the present invention, with reference to Figure 2 The identification code 32 is disposed on the outer surface of the insulating layer 31, and the transparent protective part 33 is disposed on the outer surface of the insulating layer 31. For example, when the insulating protective layer 30 is sprayed onto the outer surface of the housing 20, the insulating layer 31 can be formed by spraying it onto the outer surface of the housing 20 first, then the identification code 32 can be sprayed onto the outer surface of the insulating layer 31, and then the transparent protective part 33 can be sprayed onto the identification code 32. Part of the transparent protective part 33 covers the identification code 32, and another part of the transparent protective part 33 is located on the outer periphery of the identification code 32 and covers part of the outer surface of the insulating layer 31. By making the identification code 32 and the transparent protective part 33 disposed on the outer surface of the insulating layer 31, the insulating layer 31 will not cover the outer surface of the identification code 32. This allows for a smaller amount of material covering the outer surface of the identification code 32, making the identification code 32 clearer and easier to identify.

[0069] According to some embodiments of the present invention, with reference to Figure 3 The identification code 32 is disposed on the outer surface of the housing 20, the transparent protective part 33 is disposed on the outer surface of the housing 20, and the insulating layer 31 completely covers the transparent protective part 33, and the insulating layer 31 is a transparent insulating layer 31. For example, when the insulating protective layer 30 is sprayed on the outer surface of the housing 20, the identification code 32 can be sprayed on the outer surface of the housing 20 first, and then the transparent protective part 33 can be sprayed on the identification code 32 to cover it. Part of the transparent protective part 33 covers the identification code 32, and another part of the transparent protective part 33 is located on the outer periphery of the identification code 32 and covers part of the outer surface of the housing 20. Then, the insulating layer 31 is sprayed on the outer surface of the housing 20 and the outer surface of the transparent protective part 33 to form the insulating layer 31.

[0070] By placing the identification code 32 on the outer surface of the housing 20, placing the transparent protective part 33 on the outer surface of the housing 20, and completely covering the transparent protective part 33 with the insulating layer 31, the identification code 32 is simultaneously covered by both the transparent protective part 33 and the insulating layer 31. This provides multi-layer protection for the identification code 32, better preventing it from becoming unidentifiable or even falling off due to friction, scratches, or corrosion. Since the insulating layer 31 is transparent, the identification code 32 can still be clearly seen and identified.

[0071] According to some embodiments of the present invention, the insulating layer 31 is an insulating coating, and the transparent protective part 33 is a transparent coating. By setting both the insulating layer 31 and the transparent protective part 33 as coatings, and applying them to the outer surface of the housing 20 by spraying or coating, the adhesion between the insulating protective layer 30 and the housing 20 is stronger, making it less likely to fall off the housing 20, and the insulating protective performance is less likely to fail, thus providing a stable and reliable insulating protective function.

[0072] It should be noted that there is no chemical reaction between the transparent protective part 33 formed by spraying and the identification code 32. For example, the transparent protective part 33 will not dissolve the identification code 32.

[0073] According to some embodiments of the present invention, the identification code 32 can be inkjet printed. This facilitates the formation of the identification code 32 by inkjet printing.

[0074] According to some embodiments of the present invention, both the insulating coating and the transparent coating can be photocurable coatings, and the inkjet printing can be a photocurable ink layer. Photocurable coatings or photocurable ink layers have fast curing speeds, high production efficiency, and produce coatings or ink layers of high quality and excellent performance.

[0075] According to some embodiments of the present invention, with reference to Figures 2-4 The insulating layer 31 is an insulating coating and includes a stacked base layer 311 and a top layer 312. The base layer 311 is located between the outer surface of the housing 20 and the top layer 312. During the process of spraying the insulating layer 31 onto the outer surface of the housing 20, the base layer 311 can be sprayed first, and then the top layer 312 can be sprayed onto the base layer 311. The base layer 311 can be a single layer or multiple layers, and the top layer 312 can be a single layer or multiple layers. Both the base layer 311 and the top layer 312 have insulating properties, and the adhesion between the base layer 311 and the housing 20 is strong.

[0076] By setting the insulating layer 31 covering the outer surface of the housing 20 to include a stacked bottom layer 311 and a top layer 312, it is beneficial to further enhance the adhesion between the insulating layer 31 and the housing 20. Furthermore, the material composition of the bottom layer 311 and the top layer 312 can be set as needed, which can better meet the adhesion requirements between the insulating layer 31 and the housing 20, as well as the protective insulation performance of the insulating layer 31.

[0077] According to some embodiments of the present invention, with reference to Figure 2The identification code 32 is disposed on the outer surface of the surface layer 312, and the transparent protective part 33 is disposed on the outer surface of the surface layer 312. For example, when the insulating protective layer 30 is sprayed onto the outer surface of the housing 20, a base layer 311 can be sprayed to form the outer surface of the housing 20 first, then a surface layer 312 can be sprayed onto the base layer 311, then the identification code 32 can be sprayed onto the outer surface of the surface layer 312, and then the transparent protective part 33 can be sprayed onto the identification code 32. Part of the transparent protective part 33 covers the identification code 32, and another part of the transparent protective part 33 is located on the outer periphery of the identification code 32 and covers part of the outer surface of the surface layer 312. By making the identification code 32 and the transparent protective part 33 disposed on the outer surface of the surface layer 312, the insulating layer 31 will not cover the outer surface of the identification code 32. This allows for a smaller amount of material covering the outer surface of the identification code 32, making the identification code 32 clearer and easier to identify.

[0078] According to some embodiments of the present invention, with reference to Figure 3 The identification code 32 is disposed on the outer surface of the housing 20, the transparent protective part 33 is disposed on the outer surface of the housing 20, and the bottom layer 311 is disposed on the outer surface of the housing 20 and completely covers the transparent protective part 33. Both the bottom layer 311 and the top layer 312 are transparent layers. For example, when the insulating protective layer 30 is sprayed on the outer surface of the housing 20, the identification code 32 can be sprayed on the outer surface of the housing 20 first, and then the transparent protective part 33 can be sprayed on the identification code 32 to cover it. Part of the transparent protective part 33 covers the identification code 32, and another part of the transparent protective part 33 is located on the outer periphery of the identification code 32 and covers part of the outer surface of the housing 20. Then, the bottom layer 311 is sprayed on the outer surface of the housing 20 and the outer surface of the transparent protective part 33 to form the bottom layer 311. Finally, the top layer 312 is sprayed on the bottom layer 311 to form the top layer 312.

[0079] By placing the identification code 32 on the outer surface of the housing 20, placing the transparent protective part 33 on the outer surface of the housing 20, and completely covering the transparent protective part 33 with the insulating layer 31, the identification code 32 is simultaneously covered by both the transparent protective part 33 and the insulating layer 31. This provides multi-layer protection for the identification code 32, better preventing it from becoming unidentifiable or even falling off due to friction, scratches, or corrosion. Since the insulating layer 31 is transparent, the identification code 32 can still be clearly seen and identified.

[0080] According to some embodiments of the present invention, with reference to Figure 4The identification code 32 is disposed on the outer surface of the bottom layer 311, the transparent protective part 33 is disposed on the outer surface of the bottom layer 311, and the top layer 312 is disposed on the outer surface of the bottom layer 311 and completely covers the transparent protective part 33. The top layer 312 is a transparent layer. For example, when the insulating protective layer 30 is sprayed on the outer surface of the housing 20, the bottom layer 311 can be formed by spraying on the outer surface of the housing 20 first, then the identification code 32 can be sprayed on the outer surface of the bottom layer 311, and then the transparent protective part 33 can be sprayed on the identification code 32. Part of the transparent protective part 33 covers the identification code 32, and another part of the transparent protective part 33 is located on the outer periphery of the identification code 32 and covers part of the outer surface of the bottom layer 311. Finally, the top layer 312 is formed by spraying on the outer surface of the bottom layer 311 and the outside of the transparent protective part 33.

[0081] The outer surface of the bottom layer 311 refers to the side surface of the bottom layer 311 that is close to the surface layer 312.

[0082] By placing the identification code 32 on the outer surface of the bottom layer 311, placing the transparent protective part 33 on the outer surface of the bottom layer 311, and completely covering the transparent protective part 33 with the top layer 312, the identification code 32 is simultaneously covered by both the transparent protective part 33 and the top layer 312. This provides multi-layer protection for the identification code 32, better preventing it from becoming unidentifiable or even falling off due to friction, scratches, or erosion. Since the top layer 312 is transparent, the identification code 32 can still be clearly seen and identified.

[0083] Reference Figures 1-4 According to a second aspect embodiment of the present invention, a battery cell 100 includes a battery casing 10 and an electrode assembly, wherein the electrode assembly is disposed within the battery casing 10.

[0084] The battery casing 10 has electrode terminals 40, and an electrode assembly is disposed inside the battery casing 10 and connected to the electrode terminals 40. The electrode assembly may include a positive electrode, a negative electrode, and an insulating separator, with the insulating separator disposed between the positive and negative electrode. The electrode assembly includes a positive electrode tab and a negative electrode tab. The battery casing 10 may have two electrode terminals 40, one of which is positive and the other is negative. The positive and negative electrode tabs are respectively connected to the electrode terminals 40 of the same polarity.

[0085] According to the battery cell 100 of the present invention, by providing the battery casing 10 described above, the identification code 32 on the battery casing 10 is covered with a transparent protective part 33, which can protect the identification code 32. Even after long-term use, the identification code 32 can still remain clear, meeting the traceability requirements of the battery life cycle.

[0086] Reference Figure 5 According to a third aspect embodiment of the present invention, a battery device 200 includes: a housing 50 and a battery cell 100 according to the second aspect embodiment of the present invention, wherein the battery cell 100 is disposed within the housing 50. There may be multiple battery cells 100, and multiple battery cells 100 may be assembled into a battery module and placed within the housing 50.

[0087] For example, battery device 200 can be used in energy storage devices.

[0088] According to the battery device 200 of the present invention, by providing the above-mentioned battery cell 100, the external cover of the identification code 32 on the battery casing 10 is transparently protected by a protective part 33, which can protect the identification code 32. Even after long-term use, the identification code 32 can remain clear, thus meeting the traceability requirements of the battery life cycle.

[0089] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0090] In the description of this invention, "first feature" and "second feature" may include one or more of the features.

[0091] In the description of this invention, "a plurality of" means two or more.

[0092] In the description of this invention, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or it may include the first and second features not being in direct contact but being in contact through another feature between them.

[0093] In the description of this invention, the terms "above," "over," and "on top" for the first feature and the second feature include the first feature being directly above or diagonally above the second feature, or simply indicating that the first feature is at a higher horizontal level than the second feature.

[0094] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0095] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. A battery casing, characterized in that, include: case; An insulating protective layer is disposed on the outer surface of the housing and includes an insulating layer, an identification code, and a transparent protective portion. The insulating layer covers at least a portion of the outer surface of the housing, and the transparent protective portion completely covers the identification code.

2. The battery casing according to claim 1, characterized in that, The distance between the outer edge of the transparent protective part and the outer edge of the identification code is in the range of 5mm to 10mm; and / or, the light transmittance of the transparent protective part is >90%.

3. The battery casing according to claim 1, characterized in that, The hardness range of the transparent protective part is 70HA~85HA; and / or the adhesion range of the transparent protective part is 2.0N / cm~5.0N / cm.

4. The battery casing according to claim 1, characterized in that, The light transmittance of the insulating layer is less than that of the transparent protective portion; and / or, the hardness of the insulating layer is less than that of the transparent protective portion.

5. The battery casing according to claim 1, characterized in that, The thickness of the insulating layer is greater than the thickness of the transparent protective portion.

6. The battery casing according to claim 5, characterized in that, The thickness of the insulating layer is T1, the thickness of the transparent protective part is T2, and the ratio of T1 to T2 is in the range of 5 to 70.

7. The battery casing according to claim 1, characterized in that, The projection of the insulating layer onto the outer surface of the housing is a first projection, and the projection of the transparent protective part onto the outer surface of the housing is a second projection. The second projection is located within the first projection, and the outer edges of the first projection and the second projection are spaced apart.

8. The battery casing according to claim 1, characterized in that, The housing is cylindrical, and the outer surface of the housing includes an outer peripheral surface and two end faces. The two end faces are located on both sides of the axial direction of the housing. The identification code and the transparent protective part are both located on the outer peripheral side of the housing, and the insulating layer covers the outer peripheral surface of the housing.

9. The battery casing according to claim 8, characterized in that, The two end faces of the housing are a first end face and a second end face, respectively. The edge of the identification code includes a first edge and a second edge that are disposed opposite to each other along the axial direction of the housing. The first edge is located on the side of the identification code closer to the first end face, and the second edge is located on the side of the identification code closer to the second end face. The distance between the first edge and the first end face in the axial direction of the housing is d1, and the distance between the second edge and the second end face in the axial direction of the housing is d2. The axial length of the housing is L, and the ratio of d1 to L is greater than 10% and the ratio of d2 to L is greater than 10%.

10. The battery casing according to claim 1, characterized in that, Both the insulating layer and the transparent protective part are resin layers.

11. The battery casing according to claim 10, characterized in that, The insulating layer is an acrylic resin layer, and the transparent protective part is a modified acrylic resin layer; or, the insulating layer is a modified epoxy resin layer, and the transparent protective part is a polyurethane layer.

12. The battery casing according to any one of claims 1-11, characterized in that, The identification code is affixed to the outer surface of the insulating layer, and the transparent protective portion is affixed to the outer surface of the insulating layer; Alternatively, the identification code is located on the outer surface of the housing, the transparent protective part is located on the outer surface of the housing, the insulating layer completely covers the transparent protective part, and the insulating layer is a transparent insulating layer.

13. The battery casing according to any one of claims 1-11, characterized in that, The insulating layer is an insulating coating, the transparent protective part is a transparent coating; and / or, the identification code is inkjet printing.

14. The battery casing according to any one of claims 1-11, characterized in that, The insulating layer is an insulating coating and includes a bottom layer and a top layer, with the bottom layer located between the outer surface of the housing and the top layer.

15. The battery casing according to claim 14, characterized in that, The identification code is affixed to the outer surface of the housing, the transparent protective part is affixed to the outer surface of the housing, the bottom layer is affixed to the outer surface of the housing and completely covers the transparent protective part, and both the bottom layer and the top layer are transparent layers; Alternatively, the identification code is disposed on the outer surface of the bottom layer, the transparent protective part is disposed on the outer surface of the bottom layer, the top layer is disposed on the outer surface of the bottom layer and completely covers the transparent protective part, and the top layer is a transparent layer; Alternatively, the identification code may be located on the outer surface of the surface layer, and the transparent protective portion may be located on the outer surface of the surface layer.

16. A single battery cell, characterized in that, include: Battery casing according to any one of claims 1-15; An electrode assembly is disposed within the battery casing.

17. A battery device, characterized in that, include: Box; According to claim 16, the battery cell is disposed within the housing.

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