Battery case

Abstract

The utility model relates to a battery shell. Provided is a technique capable of protecting a wide surface of an electrode body to be housed in a battery case. The battery case for accommodating the electrode body may include a main body portion, a lid portion combined with the main body portion, and a pair of terminal portions provided on the lid portion. The main body portion may be provided with a rectangular bottom surface portion and a pair of short side surface portions extending upward from a pair of short sides of the bottom surface portion. The cover body portion may be provided with a rectangular top surface portion facing the bottom surface portion, and a pair of long side surface portions extending downward from a pair of long sides of the top surface portion. The pair of terminal portions may be provided on the top surface portion of the cover body portion.

Description

Technical Field

[0001] The technology disclosed in this specification relates to battery casings. Background Technology

[0002] Patent Document 1 discloses a battery casing that houses electrodes. The battery casing of Patent Document 1 includes a main body, a cover portion assembled with the main body, and a pair of terminal portions provided on the cover portion. The main body has a rectangular bottom portion and a pair of long side portions extending upward from a pair of long sides of the bottom portion. The cover portion has a rectangular top portion opposite the bottom portion and a pair of short side portions extending downward from a pair of short sides of the top portion. The pair of terminal portions are provided on the top portion of the cover portion.

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2022-32465 Utility Model Content

[0006] Problems to be solved by utility models

[0007] In the structure of Patent Document 1, before assembling the main body and the cover, the electrode body to be housed in the battery casing is housed between a pair of short side faces of the cover, which has terminal portions. Then, the main body and the cover are assembled with the electrode body housed between the pair of short side faces of the cover. In this structure, during the assembly of the main body and the cover, the narrower side (short side face) of the electrode body to be housed in the battery casing is covered by the pair of short side faces of the cover and is not exposed to the outside. However, the wider side (long side face) of the electrode body is exposed to the outside. Therefore, it is considered that the wider side (long side face) of the electrode body may be damaged when assembling the main body and the cover of the battery casing.

[0008] This specification provides a technique for protecting a wider surface of an electrode body intended to be housed in a battery casing.

[0009] Solution for solving the problem

[0010] In the first technical solution of this invention, the battery casing accommodating the electrodes may also include: a main body portion; a cover portion combined with the main body portion; and a pair of terminal portions disposed on the cover portion. Alternatively, the main body portion may have a rectangular bottom portion and a pair of short side portions extending upward from a pair of short sides of the bottom portion. Alternatively, the cover portion may have a rectangular top portion opposite the bottom portion and a pair of long side portions extending downward from a pair of long sides of the top portion. Alternatively, the pair of terminal portions may be disposed on the top portion of the cover portion.

[0011] According to this structure, before assembling the main body and cover of the battery casing, the electrode body to be housed in the battery casing is housed between a pair of long side faces of the cover portion, which has terminal portions. Then, the main body and cover portion are assembled with the electrode body housed between the pair of long side faces of the cover portion. According to this structure, during the assembly of the main body and cover portion, the wider surface (long side face) of the electrode body to be housed in the battery casing is covered by the pair of long side faces of the cover portion and is not exposed to the outside. Therefore, the wider surface of the electrode body to be housed in the battery casing can be protected.

[0012] In the second technical solution, according to the first technical solution above, the main body may also include: a groove for inserting the long side and a pair of short sides of the long side portion of the cover portion, the groove extending along the long side of the bottom portion and the long side of each of the pair of short side portions; and a recess for the short side of the top portion of the cover portion, the recess extending along the short side of the short side portion at the upper end of the short side portion.

[0013] This structure can suppress the formation of gaps between the main body and the cover of the battery casing. This, in turn, prevents the electrolyte inside the battery casing from leaking out. Attached Figure Description

[0014] Figure 1 This is a perspective view of a battery having a battery casing according to an embodiment.

[0015] Figure 2 This is an exploded perspective view of the battery casing of an embodiment.

[0016] Figure 3 yes Figure 2 Sectional view III-III.

[0017] Figure 4 yes Figure 2 Sectional view IV-IV.

[0018] Figure 5 yes Figure 2 VV sectional view.

[0019] Explanation of reference numerals in the attached figures

[0020] 2. Battery casing; 10. Main body; 12. Bottom part; 12a. Long side; 12b. Short side; 14. Short side part; 14a. Long side; 14b. Short side; 20. Cover part; 22. Top part; 22a. Long side; 22b. Short side; 24. Long side part; 24a. Long side; 24b. Short side; 30. Groove part; 40. Recessed part; 50. Electrode body; 60. Terminal part; 100. Battery. Detailed Implementation

[0021] The battery casing and battery of the embodiment will be described with reference to the accompanying drawings. Figure 1 and Figure 2 As shown, the battery 100 of this embodiment includes a battery casing 2, electrode bodies 50 housed in the battery casing 2, and a pair of terminal portions 60, 60 mounted on the battery casing 2. The battery 100 is, for example, a lithium-ion battery, a nickel-metal hydride battery, etc. The battery 100 is, for example, mounted in an electric vehicle (e.g., an electric vehicle, a hybrid vehicle).

[0022] The battery casing 2 includes a main body portion 10 and a cover portion 20. The battery casing 2 is constructed by combining the main body portion 10 and the cover portion 20. The main body portion 10 and the cover portion 20 are joined together, for example, by welding. The battery casing 2 houses an electrode body 50 and an electrolyte within the space surrounded by the main body portion 10 and the cover portion 20. The electrode body 50 is constructed, for example, by winding a sheet-like member (not shown) having a positive electrode, a negative electrode, and a separator.

[0023] The main body 10 of the battery casing 2 is made of a metal such as aluminum alloy. The main body 10 has a bottom part 12 and a pair of short side parts 14, 14. The bottom part 12 and the pair of short side parts 14, 14 are integrated into one piece.

[0024] The bottom surface 12 is rectangular in shape, having a pair of long sides 12a, 12a and a pair of short sides 12b, 12b. A pair of short side surfaces 14, 14 extend upward from the pair of short sides 12b, 12b of the bottom surface 12. Each short side surface 14 extends from the bottom surface 12 of the main body 10 toward the top surface 22 of the cover 20. Each short side surface 14 is rectangular in shape, having a pair of long sides 14a, 14a and a pair of short sides 14b, 14b.

[0025] In addition, the main body 10 has a pair of grooves 30, 30 provided across the bottom part 12 and a pair of short side parts 14, 14 (see reference). Figure 3 , Figure 4 The main body 10 also includes a recess 40 provided at the upper end of each short side portion 14 (see reference). Figure 5 The details of the groove 30 and the recess 40 are then described.

[0026] The cover portion 20 of the battery casing 2 is made of a metal such as aluminum alloy. The cover portion 20 has a top portion 22 and a pair of long side portions 24, 24. The top portion 22 and the pair of long side portions 24, 24 are integrated into one piece.

[0027] The top surface portion 22 faces the bottom surface portion 12 of the main body portion 10. The top surface portion 22 is rectangular in shape and has a pair of long sides 22a, 22a and a pair of short sides 22b, 22b. A pair of long side surfaces 24, 24 extend downward from the pair of long sides 22a, 22a of the top surface portion 22. Each long side surface 24 extends from the top surface portion 22 of the cover portion 20 toward the bottom surface portion 12 of the main body portion 10. An electrode body 50 is disposed between the pair of long side surfaces 24, 24. Each long side surface 24 is rectangular in shape and has a pair of long sides 24a, 24a and a pair of short sides 24b, 24b.

[0028] A pair of terminal portions 60, 60 are provided on the top surface 22 of the cover portion 20. Each terminal portion 60 is mounted on the top surface 22 in an insulated state relative to the cover portion 20. For example, an insulating member is disposed between each terminal portion 60 and the top surface 22. The pair of terminal portions 60, 60 are electrically connected to the positive and negative terminals (not shown) of the electrode body 50, respectively.

[0029] Next, the groove 30 and recess 40 provided in the main body 10 of the battery casing 2 will be described. For example... Figure 2 , Figure 3 as well as Figure 4 As shown, the main body 10 has a pair of grooves 30, 30 provided on its inner surface. The pair of grooves 30, 30 extend in parallel across the bottom portion 12 and the pair of short side portions 14, 14 of the main body 10. Each groove 30 is provided on the inner surface of the bottom portion 12 and the inner surface of each short side portion 14 of the main body 10. The portion of the groove 30 provided on the bottom portion 12 extends along the long side 12a of the bottom portion 12. The portion of the groove 30 provided on each short side portion 14 extends along the long side 14a of each short side portion 14. The portion of the groove 30 provided on the bottom portion 12 is inserted into the long side 24a of the long side portion 24 of the cover portion 20. The portion of the groove 30 provided on each short side portion 14 is inserted into the short side 24b of the long side portion 24 of the cover portion 20.

[0030] like Figure 5 As shown, each short side portion 14 of the main body portion 10 has a recess 40 provided on its inner surface. The recess 40 is provided at the upper end of the short side portion 14. The recess 40 extends along the short side 14b of the short side portion 14. The short side 22b of the top portion 22 of the cover portion 20 is disposed in the recess 40.

[0031] In the aforementioned battery casing 2 and battery 100, before assembling the main body 10 and cover 20 of the battery casing 2, the electrode 50 to be housed in the battery casing 2 is housed between a pair of long side portions 24, 24 of the cover 20, which is provided with terminal portions 60. Then, the main body 10 and cover 20 are assembled with the electrode 50 housed between the pair of long side portions 24, 24 of the cover 20. With the main body 10 and cover 20 assembled, the long side 24a and a pair of short sides 24b, 24b of the long side portions 24 of the cover 20 are inserted into the groove 30. Furthermore, the short side 22b of the top portion 22 of the cover 20 is disposed in the recess 40. The main body 10 and cover 20 are joined together, for example, by welding.

[0032] (Effect)

[0033] The battery casing 2 and battery 100 of the embodiment have been described above. As described above, the battery casing 2 includes a main body portion 10 and a cover portion 20. The main body portion 10 has a rectangular bottom portion 12 and a pair of short side portions 14, 14 extending upward from a pair of short sides 12b, 12b of the bottom portion 12. The cover portion 20 has a rectangular top portion 22 opposite to the bottom portion 12 and a pair of long side portions 24, 24 extending downward from a pair of long sides 22a, 22a of the top portion 22. A pair of terminal portions 60, 60 are provided on the top portion 22 of the cover portion 20.

[0034] According to this structure, during the assembly of the main body 10 and the cover 20, the wider surface (long side surface) of the electrode body 50 to be housed in the battery housing 2 is covered by a pair of long side surfaces 24, 24 of the cover 20 and is not exposed to the outside. Therefore, the wider surface of the electrode body 50 to be housed in the battery housing 2 can be protected.

[0035] Furthermore, the main body 10 of the battery casing 2 has a groove 30 into which the long side 24a and a pair of short sides 24b, 24b of the long side surface 24 of the cover 20 are inserted. The groove 30 extends along the long side 12a of the bottom surface 12 of the main body 10 and the long sides 14a, 14a of the pair of short side surfaces 14, 14. Additionally, the main body 10 has a recess 40 into which the short side 22b of the top surface 22 of the cover 20 is disposed. The recess 40 extends along the short side 14b of the short side surface 14 at its upper end. With this structure, gaps between the main body 10 and the cover 20 of the battery casing 2 can be suppressed. This, in turn, prevents electrolyte leakage from the inside of the battery casing 2 to the outside.

[0036] The above description details specific examples of this utility model, but these are merely illustrative and not intended to limit the scope of the claims. The technology described in the claims includes various modifications and variations of the specific examples described above. The technical elements illustrated in this specification or drawings are technically useful individually or in various combinations, and are not limited to the combinations described in the claims at the time of application. Furthermore, the technology illustrated in this specification or drawings can achieve multiple objectives simultaneously, and achieving one of these objectives is itself technically useful.

Claims

1. A battery casing housing an electrode body, characterized in that, The battery casing has: Main body; The cover portion, which is combined with the main body portion; and A pair of terminal portions, which are provided on the cover portion, The main body has a rectangular bottom portion and a pair of short side portions extending upward from a pair of short sides of the bottom portion. The cover portion has a rectangular top portion opposite to the bottom portion and a pair of long side portions extending downward from a pair of long sides of the top portion. A pair of the terminal portions are provided on the top surface of the cover portion.

2. The battery casing according to claim 1, characterized in that, The main body comprises: A groove for inserting the long side and a pair of short sides of the long side portion of the cover portion, the groove extending along the long side of the bottom portion and the long side of each of the pair of short side portions; and A recess is provided for the short side of the top surface of the cover portion, and the recess extends along the short side of the short side portion at the upper end of the short side portion.

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