Battery and shell thereof
By covering the annular end face and specific areas of the side wall of the battery casing with an anti-rust layer, the problem of easy rust at the mouth of the battery steel shell is solved, achieving a longer service life and better anti-corrosion effect.
Patent Information
- Application Number
- CN202422462942.3
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-10-11
- Publication Date
- 2025-09-26
- Estimated Expiration
- 2034-10-11
AI Technical Summary
During the manufacturing process, the steel shell of existing cylindrical lithium batteries is prone to rust at the mouth, resulting in a short service life.
The anti-rust layer is applied to the annular end surface and specific areas of the side wall of the battery housing, including the inner and outer wall areas, to prevent the steel substrate from being exposed to the air and to prevent rust.
It prolongs the service life of the battery casing and the battery, and has good anti-corrosion performance, especially in high temperature and high humidity environments.
Smart Images
Figure CN223390642U_ABST
Abstract
Description
Technical Field
[0001] The present application relates to the field of energy technology, and in particular to a battery and a casing thereof. Background Art
[0002] Cylindrical lithium batteries usually use an integrally molded steel shell as their outer shell. This design ensures that the battery has good physical stability and pressure resistance.
[0003] In the prior art, battery steel cases are typically formed from pre-nickel-plated steel strip through several processes: stretching, barrel forming, expansion forming, pre-pressing the mouth, bottom forming, and mouth scrap removal. During the pre-pressing process, the nickel plating at the mouth of the steel case tears under the pre-stressing, rendering it ineffective in preventing rust. During the mouth scrap removal process, the steel base material is exposed at the cutout, making it susceptible to rusting when exposed to air. Therefore, at least due to these two process steps, the mouth of existing battery steel cases is prone to rusting, resulting in a short service life. Utility Model Content
[0004] In view of this, the present application provides a battery and its casing, which have good anti-corrosion performance and longer service life.
[0005] This application specifically adopts the following technical solutions:
[0006] In a first aspect, an embodiment of the present application discloses a battery housing, wherein the battery housing is a hollow cylindrical structure, comprising a housing body and an anti-rust layer;
[0007] The shell body includes a side wall and a bottom wall, the side wall and the bottom wall enclose an accommodating cavity, the accommodating cavity has an opening opposite to the bottom wall, and the side of the side wall away from the bottom wall has an annular end surface surrounding the opening;
[0008] The rust-proof layer continuously covers the annular end face and the first inner wall region and the first outer wall region of the side wall, wherein the first inner wall region is the inner wall region of the side wall adjacent to the annular end face, and the first outer wall region is the outer wall region of the side wall adjacent to the annular end face.
[0009] Optionally, the first inner wall region includes a first inner wall surface, or includes the first inner wall surface and a second inner wall surface sequentially connected along a direction from the opening to the bottom wall;
[0010] The first outer wall region includes a first outer wall surface, or includes the first outer wall surface and a second outer wall surface sequentially connected along a direction from the opening to the bottom wall;
[0011] The first inner wall surface is opposite to the first outer wall surface, and gradually approaches the first inner wall surface and the first outer wall surface in a direction away from the bottom wall; the second inner wall surface is opposite to the second outer wall surface and parallel to each other.
[0012] Optionally, the maximum length of the first inner wall region and / or the first outer wall region in the axial direction of the shell body is 1-1.5 mm; and / or,
[0013] The distance between the end of the anti-rust layer farthest from the annular end surface and the annular end surface is 1.5-2 mm.
[0014] Optionally, the shell body is made of a coated steel plate, the coated steel plate includes a steel substrate and a functional coating formed on a surface of the steel substrate, wherein in the first inner wall region and / or the first outer wall region, the functional coating is broken to form at least one gap, and the steel substrate is exposed from the gap;
[0015] In the first inner wall region and the first outer wall region, the anti-rust layer is formed on a side of the functional plating layer away from the steel substrate and fills the gap.
[0016] Optionally, the anti-rust layer is a nickel plating layer or a plastic coating.
[0017] Optionally, the plastic coating includes at least one of a polyvinyl chloride coating, an epoxy resin coating and a fire retardant paint coating.
[0018] Optionally, the ratio of the maximum thickness of the anti-rust layer to the thickness of the shell body is (1-100):300;
[0019] In which, the thickness of the shell body is the thickness of the side wall part where the second inner wall area and the second outer wall area are located, the second inner wall area is the area on the inner wall of the side wall except the first inner wall area, and the second outer wall area is the area on the outer wall of the side wall except the first outer wall area.
[0020] Optionally, when the anti-rust layer is a nickel plating layer, the maximum thickness of the nickel plating layer is in the range of 1 μm to 2.5 μm.
[0021] Optionally, when the anti-rust layer is a plastic coating, the maximum thickness of the plastic coating ranges from 10 μm to 80 μm.
[0022] A second aspect of an embodiment of the present application provides a battery, comprising the battery housing described in the first aspect.
[0023] In the battery housing provided in the embodiments of the present application, the housing body has a housing cavity, one side of which is open to form the mouth of the housing body, and an anti-rust layer is formed at the opening of the housing cavity. This anti-rust layer continuously covers the annular end face surrounding the opening, as well as the first inner wall region and the first outer wall region connected to the annular end face on the inner and outer sides of the sidewall, thereby providing anti-corrosion protection for the mouth of the housing body. In this way, during the manufacturing stage of the battery housing, when the steel substrate at the mouth of the housing body is exposed due to the manufacturing process, the anti-rust layer formed at this location is not easily corroded, thereby extending the service life of the battery housing and the battery. BRIEF DESCRIPTION OF THE DRAWINGS
[0024] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following briefly introduces the drawings required for use in the description of the embodiments. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.
[0025] Figure 1 This is a schematic diagram of the cross-sectional structure of a battery housing provided in an embodiment of the present application;
[0026] Figure 2 This is a schematic structural diagram of a shell body provided in an embodiment of the present application;
[0027] Figure 3 This is a schematic diagram of a first formation position of the anti-rust layer at the mouth of the shell body provided by an embodiment of the present application;
[0028] Figure 4 This is a schematic diagram of a second formation position of the rust-proof layer at the mouth of the shell body provided by an embodiment of the present application;
[0029] Figure 5 This is a schematic diagram of a first cross-sectional structure of a battery housing opening provided in an embodiment of the present application;
[0030] Figure 6 This is a schematic diagram of the cross-sectional structure of the mouth of a shell body made of a coated steel plate provided in an embodiment of the present application;
[0031] Figure 7 The anti-rust layer provided in the embodiment of the present application is Figure 6 Schematic diagram of the formation position of the shell body mouth;
[0032] Figure 8 This is a schematic diagram of the second cross-sectional structure of the opening of a battery casing provided in an embodiment of the present application.
[0033] Reference numerals:
[0034] 1. Shell body; 11. Sidewall; 111. Annular end surface; 112. First inner wall region; 1121. First inner wall surface; 1122. Second inner wall surface; 113. First outer wall region; 1131. First outer wall surface; 1132. Second outer wall surface; 114. Second inner wall region; 115. Second outer wall region; 12. Bottom wall; 13. Accommodating cavity; 131. Opening; 14. Steel substrate; 15. Functional coating; 16. Gap;
[0035] 2. Anti-rust layer. DETAILED DESCRIPTION
[0036] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of them. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.
[0037] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.
[0038] The present application embodiment provides a battery housing, such as Figure 1 As shown, the battery housing is a hollow cylindrical structure, comprising a housing body 1 and an anti-rust layer 2. The housing body 1 constitutes the main structural framework of the battery housing, i.e., the housing body 1 is also an internally hollow cylindrical structure; the anti-rust layer 2 is formed on at least a portion of the surface of the housing body 1 to prevent rust at the location where it is formed on the housing body 1.
[0039] like Figure 2 As shown, the shell body 1 includes a side wall 11 and a bottom wall 12 connected to each other. The side wall 11 and the bottom wall 12 enclose a receiving cavity 13. The receiving cavity 13 has an opening 131 opposite to the bottom wall 12. The side of the side wall 11 away from the bottom wall 12 has an annular end surface 111 surrounding the opening 131. Figure 1 The rust-proof layer 2 continuously covers the annular end face 111, as well as the first inner wall area 112 and the first outer wall area 113 of the side wall 11, wherein the first inner wall area 112 is the inner wall area on the side wall 11 adjacent to the annular end face 111, and the first outer wall area 113 is the outer wall area on the side wall 11 adjacent to the annular end face 111.
[0040] It should be noted that, in the embodiment of the present application, the anti-rust layer 2 "continuously covers" the annular end face 111, the first inner wall area 112 and the first outer wall area 113, which means that the part of the anti-rust layer 2 used to cover the first inner wall area 112, the part used to cover the annular end face 111, and the part used to cover the first outer wall area 113 are connected in sequence.
[0041] Therefore, the battery housing provided in the embodiment of the present application achieves corrosion protection for the opening of the shell body 1 by forming an anti-rust layer 2 at the opening 131 of the accommodating cavity 13, and using this anti-rust layer 2 to continuously cover the annular end face 111 surrounding the opening 131, as well as the first inner wall region 112 and the first outer wall region 113 connected to the annular end face 111 on the inner and outer sides of the side wall 11, respectively. In this way, during the manufacturing stage of the battery housing, when the steel base material at the opening of the shell body 1 is exposed due to the manufacturing process, the anti-rust layer 2 is formed at this location, so it is not easily corroded, thereby extending the service life of the battery housing and the battery.
[0042] It should be noted that, since the shell body 1 is usually made of steel plates through an integrated molding process during manufacturing, after the mouth and bottom of the shell body 1 are formed, the excess waste material at the mouth needs to be cut off to make the mouth structure more regular. However, cutting will form a cross-section, which exposes the steel substrate in the steel plate to the air and is prone to rust. In the embodiment of the present application, the annular end face 111 is the cross-section caused by cutting the waste material at the mouth. By forming an anti-rust layer 2 on the annular end face 111, the steel substrate of the cross-section can be prevented from directly contacting the air, thereby avoiding rust on the cross-section of the shell body 1 mouth.
[0043] In one example of this application, see Figure 3 The first inner wall area 112 includes a first inner wall surface 1121, and the first outer wall area 113 includes a first outer wall surface 1131, wherein the first inner wall surface 1121 and the first outer wall surface 1131 are opposite to each other, and along the direction away from the bottom wall 12, the first inner wall surface 1121 and the first outer wall surface 1131 gradually approach each other.
[0044] It should be noted that during the molding process of the shell body 1, the pre-pressing process at the mouth causes tensile deformation of the side wall 11 of the shell body 1 near the opening 131. This tensile deformation may expose or even tear the steel substrate used to manufacture the shell body 1. If this part is not treated, it will be prone to rust during subsequent use.
[0045] The first inner wall surface 1121 and the first outer wall surface 1131 are located at the portion where the stretching deformation occurs. Therefore, in this example, the first inner wall surface 1121 and the first outer wall surface 1131 are covered with the anti-rust layer 2, so that the portion of the shell body 1 where the stretching deformation occurs is isolated from moisture, thereby preventing rust in this portion to a certain extent, thereby improving the service life of the battery shell.
[0046] In another example of this application, see Figure 4In addition to the first inner wall surface 1121, the first inner wall region 112 also includes a second inner wall surface 1122. The first inner wall surface 1121 and the second inner wall surface 1122 are sequentially connected along the direction from the opening 131 to the bottom wall 12. The first outer wall region 113, in addition to the first outer wall surface 1131, also includes a second outer wall surface 1132. The first outer wall surface 1131 and the second outer wall surface 1132 are sequentially connected along the direction from the opening 131 to the bottom wall 12. The second inner wall surface 1122 and the second outer wall surface 1132 are opposite to each other and are parallel to each other.
[0047] The second inner wall surface 1122 and the second outer wall surface 1132 are parallel to each other, meaning that the second inner wall surface 1122 and the second outer wall surface 1132 are located in a portion of the side wall 11 with uniform thickness, which has not undergone tensile deformation. Compared to the previous example, this example further takes into account that the edge of the anti-rust layer 2 is located just near the portion that has undergone tensile deformation, and water vapor may intrude from the edge of the anti-rust layer 2, causing rust. Therefore, in this example, the coverage area of the anti-rust layer 2 is further expanded so that it is located in the portion of the side wall 11 that has not undergone tensile deformation. That is, the anti-rust layer 2 also covers the second inner wall surface 1122 and the second outer wall surface 1132. This increases the distance that water vapor can intrude from the edge of the anti-rust layer 2, reduces the probability that the opening of the shell body 1 will be corroded by water vapor entering from this position, and provides excellent anti-rust protection.
[0048] In other examples of the present application, the coverage area of the anti-rust layer 2 can also be determined according to actual needs, for example, the first inner wall area 112 only includes the first inner wall surface 1121, and the first outer wall area 113 includes the first outer wall surface 1131 and the second outer wall surface 1132; or, the first inner wall area 112 includes the first inner wall surface 1121 and the second inner wall surface 1122, and the first outer wall area 113 only includes the first outer wall surface 1131.
[0049] For example, the battery housing provided in the embodiment of the present application can be applied to cylindrical lithium batteries, such as 18650 lithium batteries, 21700 lithium batteries, etc. When manufacturing the housing of a cylindrical lithium battery, in the mouth pre-pressing process stage, such as Figure 5 As shown, along the axial direction of the shell body 1, the maximum length L1 of the portion of the side wall 11 that undergoes tensile deformation is 1mm-1.5mm, that is, the maximum length of the first inner wall surface 1121 and / or the first outer wall surface 1131 in the axial direction of the shell body 1 is 1mm-1.5mm. The axial direction of the shell body 1 refers to the extension direction of the central axis of the shell body 1, and the bottom wall 12 and the opening 131 of the shell body 1 are arranged relative to each other in the axial direction of the shell body 1. The anti-rust layer 2 needs to cover at least the portion that undergoes tensile deformation to slow down or prevent rust in this portion. For example, continue to refer to Figure 5The distance L2 between the end of the anti-rust layer 2 close to the bottom wall 12 and the annular end surface 111 is 1.5 mm to 2 mm. Therefore, a good anti-rust effect is guaranteed.
[0050] In some embodiments of the present application, the shell body 1 is made of a coated steel sheet, which includes a steel substrate 14 and a functional coating 15 formed on the surface of the steel substrate 14. Exemplarily, the coated steel sheet used to manufacture the shell body 1 is a galvanized steel sheet, which includes a steel substrate 14 and a zinc coating formed on various surfaces of the steel substrate 14 by hot-dip plating or electroplating. After the steel substrate 14 is galvanized, the zinc forms a thin and dense protective layer of zinc carbonate on the surface of the steel substrate 14, thereby protecting the steel substrate 14 from corrosion by moisture in the environment.
[0051] When the shell body 1 is manufactured using a coated steel plate, the pre-pressed portion will be stretched and deformed during the pre-pressing process of the mouth, causing the functional coating 15 to tear or break and fail. Figure 6 As shown, since the portion where the first inner wall area 112 is located and the portion where the first outer wall area 113 is located will undergo tensile deformation, the functional coating 15 in the first inner wall area 112 and the first outer wall area 113 will break to form at least one gap 16, and the steel substrate 14 will be exposed from the gap 16 and bear a greater risk of rust.
[0052] In the embodiments of this application, Figure 7 As shown, in the first inner wall region 112 and the first outer wall region 113, the anti-rust layer 2 is formed on the side of the functional coating 15 away from the steel substrate 14, and fills the gap 16 formed by the fracture of the functional coating 15. Therefore, direct contact between the steel substrate and moisture in the environment is avoided, slowing down or even preventing the occurrence of rust.
[0053] In some embodiments of the present application, the anti-rust layer 2 may be a metal / alloy plating or plastic coating that can provide anti-rust protection. Examples of the metal / alloy plating include nickel plating, chrome plating, aluminum plating, and zinc-nickel alloy plating, and examples of the plastic coating include polyvinyl chloride (PVC) coating, epoxy resin coating, and fire-retardant paint coating.
[0054] Metal / alloy plating generally has better corrosion resistance, weather resistance and adhesion, especially in various harsh environments. It is superior to plastic coating in terms of service life and anti-rust protection. Moreover, metal / alloy gold plating can improve the appearance of the metal material surface and is suitable for some scenes and fields with appearance requirements.
[0055] Compared to metal / alloy plating, plastic coating can also effectively protect the housing body 1 from moisture and rust, but its service life is short, its strength is limited, and it can easily be rubbed off, affecting its rust-proofing effect. However, plastic coating has wider applicability, is relatively simple to manufacture, and is less expensive.
[0056] Those skilled in the art may select a metal / alloy plating layer or a plastic coating as the anti-rust layer 2 according to actual needs, and apply or plate it on the mouth of the shell body 1 .
[0057] In some embodiments of the present application, Figure 8 As shown, the ratio of the maximum thickness d1 of the anti-rust layer 2 to the thickness D of the housing body 1 is (1-100):300. The thickness D of the housing body 1 is the thickness of the portion of the sidewall 11 where the second inner wall region 114 and the second outer wall region 115 are located. The second inner wall region 114 is the area on the inner wall of the sidewall 11 excluding the first inner wall region 112, and the second outer wall region 115 is the area on the outer wall of the sidewall 11 excluding the first outer wall region 113. This prevents rust from forming on the open end of the housing body 1 while preventing the anti-rust layer 2 from being too thick and affecting or hindering the installation of internal battery components.
[0058] It is easy to understand that the portion of the side wall 11 where the second inner wall region 114 and the second outer wall region 115 are located is the portion of the side wall 11 that has not undergone tensile deformation, and the thickness of this portion can be considered as the thickness of the shell body 1. Generally speaking, the thickness D of the shell body 1 is in the range of 0.25 mm to 0.4 mm.
[0059] The thickness of the anti-rust layer 2 is less than that of the shell body 1. Since the anti-rust layer 2 continuously covers the first inner wall area 112, the annular end surface 111 and the first outer wall area 113 of the side wall 11, the thickness of the anti-rust layer 2 at different positions may be equal or unequal. Taking the thickness of the anti-rust layer 2 corresponding to the annular end surface 111 as an example, for example, see Figure 7 The shape of the anti-rust layer 2 is close to that of the shell body 1, and the thickness of each position of the anti-rust layer 2 for covering the annular end face 111 is equal; for example, see Figure 8 The shape of the anti-rust layer 2 is different from that of the shell body 1, and the thickness of the portion of the anti-rust layer 2 covering the annular end face 111 is different at each position. Therefore, when determining the thickness of the anti-rust layer 2, the maximum thickness of the anti-rust layer 2 needs to be selected. For example, Figure 8 As shown, the anti-rust layer 2 has a thickness d1 at a certain position corresponding to the annular end surface 111 and a thickness d2 at a certain position corresponding to the first outer wall area 113. By comparison, d1>d2, so the maximum thickness of the anti-rust layer 2 obviously cannot be d2.
[0060] Furthermore, for the anti-rust layers 2 made of different materials, the maximum thickness of the plastic coating is generally greater than the maximum thickness of the metal / alloy coating to ensure uniform appearance.
[0061] Optionally, when the anti-rust layer 2 is a metal / alloy plating layer, the maximum thickness of the metal / alloy plating layer is in the range of 1 μm to 2.5 μm. Within this thickness range, the metal / alloy plating layer can maintain a certain degree of air permeability and adhesion to ensure good bonding with the shell body 1, and has a good anti-rust effect while being relatively low in weight and cost. Exemplarily, the metal / alloy plating layer is a nickel plating layer.
[0062] Optionally, when the anti-rust layer 2 is a plastic coating, the maximum thickness of the plastic coating ranges from 10 μm to 80 μm. Within this thickness range, the plastic coating can physically block the humidity, dust, and pollutants required for the corrosion reaction, while also providing excellent rust removal and corrosion inhibition functions, providing a more durable anti-rust effect. Exemplarily, the plastic coating is a PVC coating.
[0063] An embodiment of the present application further provides a battery, which includes the battery housing described in the above embodiment.
[0064] The battery provided in the embodiment of the present application has excellent corrosion resistance due to the use of the battery housing described in the above embodiment, and is particularly not susceptible to corrosion in high temperature and high humidity environments, thereby extending its service life.
[0065] Illustratively, the battery provided in the embodiment of the present application is a cylindrical lithium battery, which includes the above-mentioned battery casing and a battery cell located in the accommodating cavity 13 of the battery casing.
[0066] In the description of this application, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," "outer," and the like, indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are intended only to facilitate the description of this application and simplify the description. They do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed, or operate in a specific orientation. Therefore, they should not be construed as limiting this application. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly indicating the number of the technical features indicated.
[0067] The above description is only for the purpose of facilitating those skilled in the art to understand the technical solution of this application and is not intended to limit this application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of this application shall be included in the scope of protection of this application.
Claims
1. A battery casing, characterized in that: The battery shell is a hollow cylindrical structure, comprising a shell body (1) and an anti-rust layer (2); The shell body (1) comprises a side wall (11) and a bottom wall (12); the side wall (11) and the bottom wall (12) enclose an accommodating cavity (13); the accommodating cavity (13) has an opening (131) opposite to the bottom wall (12); and the side of the side wall (11) away from the bottom wall (12) has an annular end surface (111) surrounding the opening (131); The rust-proof layer (2) continuously covers the annular end face (111) and the first inner wall region (112) and the first outer wall region (113) of the side wall (11), wherein the first inner wall region (112) is the inner wall region of the side wall (11) adjacent to the annular end face (111), and the first outer wall region (113) is the outer wall region of the side wall (11) adjacent to the annular end face (111).
2. The battery housing according to claim 1, wherein: The first inner wall region (112) includes a first inner wall surface (1121), or includes the first inner wall surface (1121) and a second inner wall surface (1122) sequentially connected along a direction from the opening (131) to the bottom wall (12); The first outer wall region (113) includes a first outer wall surface (1131), or includes the first outer wall surface (1131) and a second outer wall surface (1132) sequentially connected along a direction from the opening (131) to the bottom wall (12); The first inner wall surface (1121) is opposite to the first outer wall surface (1131), and gradually approaches the first inner wall surface (1121) and the first outer wall surface (1131) in a direction away from the bottom wall (12); the second inner wall surface (1122) is opposite to the second outer wall surface (1132), and is parallel to each other.
3. The battery housing according to claim 2, wherein: The maximum length of the first inner wall surface (1121) and / or the first outer wall surface (1131) in the axial direction of the shell body (1) is 1 mm to 1.5 mm; and / or, The distance between the end of the anti-rust layer (2) close to the bottom wall (12) and the annular end surface (111) is 1.5 mm to 2 mm.
4. The battery housing according to claim 1, wherein: The shell body (1) is made of a coated steel plate, the coated steel plate includes a steel substrate (14) and a functional coating (15) formed on the surface of the steel substrate (14), wherein the functional coating (15) is broken in the first inner wall region (112) and / or the first outer wall region (113) to form at least one gap (16), and the steel substrate (14) is exposed from the gap (16); In the first inner wall region (112) and the first outer wall region (113), the anti-rust layer (2) is formed on a side of the functional coating layer (15) away from the steel substrate (14) and fills the gap (16).
5. The battery housing according to any one of claims 1 to 4, characterized in that: The anti-rust layer (2) is a nickel plating layer or a plastic coating.
6. The battery housing according to claim 5, characterized in that The plastic coating includes at least one of a polyvinyl chloride coating, an epoxy resin coating and a fire retardant paint coating.
7. The battery housing according to claim 5, wherein: The ratio of the maximum thickness of the anti-rust layer (2) to the thickness of the shell body (1) is (1-100):300; The thickness of the shell body (1) is the thickness of the side wall portion where the second inner wall region (114) and the second outer wall region (115) are located, the second inner wall region (114) is the region on the inner wall of the side wall (11) excluding the first inner wall region (112), and the second outer wall region (115) is the region on the outer wall of the side wall (11) excluding the first outer wall region (113).
8. The battery housing according to claim 7, wherein: When the anti-rust layer (2) is a nickel plating layer, the maximum thickness of the nickel plating layer is in the range of 1 μm to 2.5 μm.
9. The battery housing according to claim 7, wherein: When the anti-rust layer (2) is a plastic coating, the maximum thickness of the plastic coating ranges from 10 μm to 80 μm.
10. A battery, characterized in that: The battery comprises the battery casing according to any one of claims 1 to 9.