Battery case

Abstract

To provide a battery case in which fire resistance can be improved, weight saving can be achieved, and electromagnetic shielding properties can be improved in an upper case.SOLUTION: A battery case 10 includes a lower case 30 and an upper case 40. A battery 20 is housed inside the battery case in a state where the lower case 30 and the upper case 40 are put together. The upper case 40 includes a base layer 45 composed of a metallic material, and a shield layer 46 laminated on the base layer 45. A specific gravity of the base layer 45 is smaller than a specific gravity of iron. The shield layer 46 is composed of a metallic material having a larger permeability than a permeability of the base layer 45.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] The present invention relates to a battery case.

Background Art

[0002] The battery case disclosed in Patent Document 1 includes a battery receiving portion and a battery cover. A battery is housed in the space between the battery receiving portion and the battery cover. The battery cover is a laminate in which a resin layer and a metal layer are laminated on one side thereof. The metal layer is provided to improve the electromagnetic wave shielding of the battery cover. The metal layer is formed by metal spraying.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] In the battery cover of Patent Document 1, since the metal layer is formed by metal spraying, it is a thin film. Therefore, there is a concern that the fire resistance of the battery cover will be inferior. Thus, there is a demand for a battery case that can improve fire resistance, achieve weight reduction, and further improve electromagnetic wave shielding properties.

[0005] The present invention has been completed based on the above circumstances, and an object of the present invention is to provide a battery case that can improve fire resistance, achieve weight reduction, and improve electromagnetic wave shielding properties in an upper case.

Means for Solving the Problems

[0006] The battery case of the present invention is A battery case comprising a lower case and an upper case, wherein a battery is housed inside when the lower case and the upper case are assembled together, The aforementioned upper case is A base layer made of a metal material, A shield layer is laminated on the base layer, It has, The specific gravity of the aforementioned base layer is less than that of iron. The shielding layer is made of a metallic material having a magnetic permeability greater than that of the base layer. [Effects of the Invention]

[0007] According to the present invention, a battery case can be realized in the upper case that can improve fire resistance, reduce weight, and improve electromagnetic wave shielding. [Brief explanation of the drawing]

[0008] [Figure 1] This is a side cross-sectional view illustrating the battery case of Example 1. [Figure 2] This is a side view illustrating a vehicle to which the battery case of Embodiment 1 is installed. [Figure 3] This is an enlarged view showing the connection point between the two flange sections in Figure 1. [Modes for carrying out the invention]

[0009] According to the battery case of the present invention, since the upper case is made of a metal material, fire resistance can be improved compared to a configuration made of a resin material. Furthermore, since the specific gravity of the base layer is lower than that of iron, the weight of the upper case can be reduced. In addition, since the shielding layer is made of a metal material with a magnetic permeability greater than that of the base layer, the electromagnetic wave shielding performance of the upper case can be enhanced.

[0010] In the battery case of the present invention, the shield layer is preferably made of plating. As a result, since the shield layer made of plating is thin, it is possible to prevent an increase in the weight of the upper case even if the specific gravity of the shield layer material is relatively high.

[0011] In the battery case of the present invention, the shielding layer preferably contains nickel. This allows nickel to be suitably used as a metallic material with a magnetic permeability greater than that of the base layer.

[0012] In the battery case of the present invention, it is preferable that the lower case is made of a metal material and that a coating film is provided on the contact surface between the lower case and the upper case by cationic electrodeposition. This allows the lower case and the upper case to be insulated by the coating film, and prevents electrolytic corrosion between the lower case and the upper case.

[0013] <Example 1> Hereinafter, an embodiment of the present invention, Example 1, will be described with reference to Figures 1 and 2. For the sake of explanation, in the following description, the vertical direction shown in Figures 1 and 2 will be defined as the vertical direction, but it does not necessarily have to coincide with the vertical direction in the actual arrangement of the battery case 10.

[0014] (Battery case configuration) As shown in Figure 1, the battery case 10 of this embodiment houses a battery (e.g., a battery module) 20. The battery case 10 can house multiple batteries 20. The battery case 10 is, for example, roughly rectangular in shape when viewed from above. The battery case 10 is attached to the underside S (outer surface under the floor) of the vehicle body B, as shown in Figure 2, with support from below by a bracket (not shown). The battery case 10 also houses electrical components such as a CPU and sensors.

[0015] As shown in FIG. 1, the battery case 10 includes a lower case 30 and an upper case 40. The battery case 10 houses the battery 20 inside in a state where the lower case 30 and the upper case 40 are assembled. The battery 20 is placed on the inner bottom surface of the lower case 30. The upper case 40 covers and closes the opening of the lower case 30.

[0016] The lower case 30 is made of a metal material. As shown in FIG. 1, the lower case 30 has a bottom wall 31, side walls 32, and a flange portion 33. The bottom wall 31 is in the shape of a square plate. The side walls 32 rise from the periphery of the bottom wall 31. The flange portion 33 projects outward from the upper end of the side walls 32.

[0017] The upper case 40 is made of a metal material. As shown in FIG. 1, the upper case 40 has a ceiling wall 41, side walls 42, and a flange portion 43. The ceiling wall 41 is in the shape of a square plate. The side walls 42 extend downward from the periphery of the ceiling wall 41. The flange portion 43 projects outward from the lower end of the side walls 42.

[0018] As shown in FIG. 1, the lower case 30 and the upper case 40 are fastened by a bolt 51 and a nut 52 which are fastening members. The bolt 51 and the nut 52 are, for example, made of metal. The bolt 51 is inserted through through-holes 34 and 44 formed in the flange portions 33 and 43 respectively. The two flange portions 33 and 43 are sandwiched and fastened by the head of the bolt 51 and the nut 52. Thereby, the lower case 30, the upper case 40, the bolt 51, and the nut 52 are electrically conductive.

[0019] (Configuration of the lower case) The lower case 30 contains iron. Therefore, the lower case 30 can ensure strength. The thickness of the lower case 30 is preferably 0.7 mm or more and 1.2 mm or less. As shown in FIG. 3, a coating film 35 is provided on the entire surface of the lower case 30. The coating film 35 is formed by cationic electrodeposition. The coating film 35 is provided on the contact surfaces (the upper surface of the flange portion 33 and the lower surface of the flange portion 43) between the lower case 30 and the upper case 40. Therefore, the coating film 35 can insulate the lower case 30 and the upper case 40 and prevent electrolytic corrosion between the lower case 30 and the upper case 40. Further, when the paint used for cationic electrodeposition is an aqueous paint, an organic solvent is not required, and the adverse impact on the environment is small.

[0020] (Configuration of the upper case) As shown in FIG. 1, the upper case 40 has a base layer 45 and a shield layer 46. The base layer 45 is made of a metal material. The shield layer 46 is laminated on the base layer 45. The shield layer 46 is made of a metal material. Thus, since the upper case 40 (the base layer 45 and the shield layer 46) is made of a metal material, the fire resistance can be improved as compared with a configuration made of a resin material.

[0021] The specific gravity of the base layer 45 is smaller than the specific gravity of iron (about 7.87 g / cm , ,

[0022] , 3 ). For example, the base layer 45 contains aluminum having a specific gravity of about 2.71 g / cm 3 . Since the specific gravity of the base layer 45 is smaller than the specific gravity of iron, the weight of the upper case 40 can be reduced. The thickness of the base layer 45 is preferably 0.7 mm or more and 1.2 mm or less.

[0022] The shielding layer 46 covers the entire base layer 45. Specifically, the shielding layer 46 is laminated on the upper and lower surfaces of the base layer 45. The shielding layer 46 is made of a metallic material with a magnetic permeability greater than that of the base layer 45. For example, the shielding layer 46 contains nickel. This enhances the electromagnetic shielding performance of the upper case 40. Specifically, it enhances the electromagnetic shielding performance from the outside to the inside of the battery case 10, as well as from the inside to the outside of the battery case 10.

[0023] The shield layer 46 is made of plating (e.g., electroplating, electroless plating). Therefore, the shield layer 46 is thin, and even if the specific gravity of the material of the shield layer 46 is relatively high, it is possible to prevent an increase in the weight of the upper case 40. The shield layer 46 made of plating has excellent corrosion resistance. The contact between the plated shield layer 46 and the lower case 30 prevents electrolytic corrosion between the upper case 40 and the lower case 30.

[0024] (Effects of this embodiment) The effects of this embodiment 1 are described below. According to the battery case 10 of this embodiment 1, the upper case 40 is made of a metal material, which improves fire resistance compared to a configuration made of a resin material. In addition, since the specific gravity of the base layer 45 is lower than that of iron, the upper case 40 can be made lighter. Furthermore, since the shielding layer 46 is made of a metal material with a higher magnetic permeability than that of the base layer 45, the electromagnetic wave shielding performance of the upper case 40 can be improved.

[0025] In the battery case 10 of this embodiment 1, the shield layer 46 is made of plating. As a result, because the shield layer 46 made of plating is thin, it is possible to prevent an increase in the weight of the upper case 40 even if the specific gravity of the material of the shield layer 46 is relatively high.

[0026] In the battery case 10 of this embodiment 1, the shield layer 46 contains nickel. This allows nickel to be suitably used as a metallic material with a magnetic permeability greater than that of the base layer 45.

[0027] In the battery case 10 of this embodiment 1, the lower case 30 is made of a metal material, and a coating 35 is provided on the contact surface between the lower case 30 and the upper case 40 by cationic electrodeposition. As a result, the coating 35 can insulate the lower case 30 and the upper case 40, and galvanic corrosion between the lower case 30 and the upper case 40 can be prevented.

[0028] <Other examples> The present invention is not limited to the embodiments described above and in the drawings, and the following embodiments, for example, are also included in the technical scope of the present invention. (1) In the above Example 1, aluminum was used as an example material for the base layer 45 of the upper case 40, but other materials may be used as long as their specific gravity is less than that of iron. For example, aluminum alloy, magnesium, magnesium alloy, titanium, titanium alloy, steel, copper, etc. may be used as the material for the base layer 45. (2) In the above embodiment 1, the shield layer 46 of the upper case 40 was made of plating, but it may be formed by a method other than plating (such as thermal spraying). (3) In the above Example 1, nickel was used as an example material for the shield layer 46 of the upper case 40, but other materials may be used as long as their magnetic permeability is greater than that of the base layer 45. For example, if aluminum is used for the base layer 45, permalloy or the like may be used as the material for the shield layer 46. (4) In the above embodiment 1, the lower case 30 and the upper case 40 were fastened together by bolts 51 and nuts 52, but they may also be fastened together by clips or the like. (5) In Example 1 above, the lower case 30 contained iron, but it may contain other materials. For example, the lower case 30 may contain aluminum. In this case, the thickness of the lower case 30 is preferably 2.0 mm or more. (6) In the above embodiment 1, the shield layer 46 covered the entire base layer 45, but it may cover only one side of the upper and lower surfaces of the base layer 45. (7) In the above embodiment 1, the coating 35 was provided on the lower case 30, but it may also be provided on the lower surface of the flange portion 43 of the upper case 40. [Explanation of Symbols]

[0029] 10…Battery case 20... Battery 30...Lower case 31...Bottom wall 32…Side wall 33…Flange section 34…Through hole 35…coating 40… Upper case 41… Ceiling and walls 42…Side wall 43…Flange section 44…Through hole 45…Base layer 46...Shield layer 51... Bolt 52... Nut B...Vehicle body S…Bottom surface

Claims

1. A battery case comprising a lower case and an upper case, wherein a battery is housed inside when the lower case and the upper case are assembled together, The aforementioned upper case is A base layer made of a metal material, A shield layer is laminated on the base layer, It has, The specific gravity of the aforementioned base layer is less than that of iron. The shielding layer is made of a metallic material having a magnetic permeability greater than that of the base layer. The aforementioned lower case is a battery case containing iron.

2. The battery case according to claim 1, wherein the shield layer is made of plating.

3. The battery case according to claim 1 or claim 2, wherein the shielding layer comprises nickel.

4. A battery case comprising a lower case and an upper case, wherein a battery is housed inside when the lower case and the upper case are assembled together, The aforementioned upper case is A base layer made of a metal material, A shield layer is laminated on the base layer, It has, The specific gravity of the aforementioned base layer is less than that of iron. The shielding layer is made of a metallic material having a magnetic permeability greater than that of the base layer. The lower case is made of a metal material, A battery case in which a coating film is provided by cationic electrodeposition on the contact surface between the lower case and the upper case.

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