CN212571230U

CN212571230U - Battery box

Info

Publication number: CN212571230U
Application number: CN202021290225.2U
Authority: CN
Inventors: 水口惠太; 小松顺一
Original assignee: Toyota Motor Corp
Current assignee: Toyota Motor Corp
Priority date: 2020-07-03
Filing date: 2020-07-03
Publication date: 2021-02-19
Anticipated expiration: 2030-07-03

Abstract

The utility model provides a battery box, this battery box is made by deep-drawing processing, possess the accommodation space of the all solid-state battery of holding, this battery box is by integrated into one piece for two cap shape portions by connecting portion parallel connection, each cap shape portion has the horizontal wall that a limit is connected with connecting portion, three vertical wall that does not extend respectively with the three limit that connecting portion are connected of this horizontal wall, and the flat portion that extends horizontally from the tip of this three vertical wall respectively, the accommodation space is relative from top to bottom through the horizontal wall that is converted into each other with two cap shape portions, the space that constitutes is mutually overlapped state and mutually flat portion. Based on the above structure of the utility model, carry out integrated into one piece to the battery case and add man-hour can not produce the negative angle to can save one side flat portion, make the volume of battery case reduce.

Description

Battery box

Technical Field

The utility model relates to a battery case for holding all-solid-state battery.

Background

Generally, as a battery case that houses an all-solid battery, a battery case that is configured by drawing a laminate film and covers the all-solid battery is known.

Conventionally, such a battery case is provided with, for example, two hat-shaped cap portions c each having a cup portion a with an open upper end portion and a flat portion b extending around the cup portion a in a flat plate shape as shown in fig. 7. As shown in fig. 8, the two hat portions c are stacked with the open ends of the respective cups a facing each other, and the accommodating space d is formed by the two cups a as shown in fig. 9. The flat portions b of the two cap-shaped portions c are joined to each other by a joining machine e in a state where the all-solid battery is accommodated in the accommodation space d. In this structure, the height of the two cup portions a is about half of the height of the all-solid battery.

However, in the battery case of the above-mentioned prior art, since the all-solid-state battery is accommodated in the accommodating space d in a sealed state, the circumference of the accommodating space d needs to be closed. Therefore, it is necessary to form the flat portions b on four sides of each cup portion a, and to engage the flat portions b of each of the two cap portions c with each other. Therefore, the battery case thus configured has a large volume, and the spatial arrangement efficiency of the battery case in a vehicle or the like is reduced.

In this case, the two cap portions may be integrally connected to each other at one side of the cup portion, so that the joining at the side is not required, and it is only necessary to form a flat portion for joining at the remaining three sides. This eliminates the need for one flat portion, and reduces the volume of the battery case accordingly. As a result, the space arrangement efficiency of the battery case can be improved.

However, when the two hat-shaped portions are integrally formed, if a negative angle is present in the integrated member when the integrated hat-shaped portions are molded, it is difficult to pull out the mold, and thus the integrated molding is difficult.

SUMMERY OF THE UTILITY MODEL

In view of the above-mentioned problems, an object of the present invention is to provide a battery case in which two cap portions are integrally molded, a negative angle is not generated during molding, and one flat portion is omitted.

As the technical scheme who solves above-mentioned technical problem, the utility model provides a battery case, this battery case is made by deep-drawing processing, possesses the accommodation space of the all solid-state battery of holding, its characterized in that: the battery case is integrally formed as two cap-shaped parts connected in parallel by a connecting part, each of the cap-shaped parts has a lateral wall having one side connected to the connecting part, three longitudinal walls extending from three sides of the lateral wall not connected to the connecting part, respectively, and flat parts extending horizontally from end parts of the three longitudinal walls, respectively, and the receiving space is a space formed by folding the two cap-shaped parts in a state in which the lateral walls are opposed to each other in the vertical direction and the flat parts are overlapped with each other.

The utility model discloses an above-mentioned battery case's advantage lies in, because the battery case is earlier by integrated into one piece for two cap shape portions by connecting portion parallel connection, so do not have the negative angle in the component after the integrated into one piece processing, can not take place the problem that the mould is difficult to extract, in addition, because only the tip at the three vertical wall that does not extend respectively with the three limit that connecting portion are connected from the horizontal wall is formed with flat portion, so save flat portion on one side, enable the volume of battery case to reduce correspondingly, and can reduce the work load of joint operation.

In the above battery box of the present invention, preferably, the two cap-shaped portions are a first cap-shaped portion and a second cap-shaped portion, the lateral wall of the first cap-shaped portion and the lateral wall of the second cap-shaped portion are connected by the straight connecting portion to form a whole flat plate, a connecting portion and the lateral wall of the first cap-shaped portion are connected to form a first folding line, and a connecting portion and the lateral wall of the second cap-shaped portion are connected to form a second folding line, the accommodating space is a space formed by bending the connecting portion along the first folding line toward the first cap-shaped portion in a right angle shape, and bending the lateral wall of the second cap-shaped portion along the second folding line toward the first cap-shaped portion in a right angle shape, and vertically opposing the lateral wall of the first cap-shaped portion, and in the accommodating space, the top wall is formed by the lateral wall of the first cap-shaped portion; the bottom wall is formed by the transverse wall of the second hat-shaped part; the side wall of one side is formed by the connecting part; the side walls of the other three sides are formed by vertically butting vertical walls of the first cap-shaped part and the second cap-shaped part.

Based on the structure, the transverse wall of the first cap-shaped part and the transverse wall of the second cap-shaped part are connected into a whole flat plate by the straight connecting part, so the integral forming and processing are easy, and in the accommodating space formed by folding the first cap-shaped part and the second cap-shaped part in half, one side wall is formed by the straight connecting part; in addition, since the side walls of the three sides are formed by vertically abutting the vertical walls of the first cap-shaped part and the second cap-shaped part, the battery case is compact and has a shape that is easy to arrange.

In the above battery pack of the present invention, the two cap-shaped portions may be a first cap-shaped portion and a second cap-shaped portion, the lateral wall of the first cap-shaped portion and the lateral wall of the second cap-shaped portion are connected by the connecting portion having a V-shaped or U-shaped cross section, and the central line of the bottom of the V-shaped or U-shaped cross section of the connecting portion is used as a folding line, the accommodating space is formed by the connecting portion being bent along the folding line such that the first cap-shaped portion is located below the second cap-shaped portion and the lateral wall of the first cap-shaped portion are vertically opposed to each other, and the top wall of the accommodating space is formed by the lateral wall of the first cap-shaped portion; the bottom wall is formed by the transverse wall of the second hat-shaped part; the side wall of one side is formed by the folded connecting part; the side walls of the other three sides are formed by vertically butting vertical walls of the first cap-shaped part and the second cap-shaped part.

Based on the structure, because the transverse wall of the first cap-shaped part is connected with the transverse wall of the second cap-shaped part by the connecting part with the V-shaped or U-shaped cross section, a negative angle does not exist in the integrally formed member, and the accommodating space can be formed by only conveniently folding the first cap-shaped part to the lower part of the second cap-shaped part, so the folding processing is simpler, and in addition, the side wall of one side in the accommodating space is formed by the connecting part; the side walls of the three sides are formed by vertically abutting the vertical walls of the first cap-shaped part and the second cap-shaped part, so that the volume of the battery box can be reduced.

In the battery pack of the present invention, it is preferable that the first cap-shaped part and the second cap-shaped part surrounding three sides of the receiving space are vertically stacked and joined to each other at flat portions thereof, so that the receiving space is closed.

Drawings

Fig. 1 is a perspective view showing a battery pack according to a first embodiment of the present invention.

Fig. 2 is a perspective view showing a state before folding the battery case.

Fig. 3A is a sectional view taken along the line iii-iii of fig. 2.

Fig. 3B is a sectional view showing a state after being folded along the first folding line from the state shown in fig. 3A.

Fig. 3C is a sectional view showing a state after being folded along the second folding line from the state shown in fig. 3B.

Fig. 4 is a sectional view showing a state before folding of a battery case according to a second embodiment of the present invention.

Fig. 5 is a sectional view showing a state in which the battery case shown in fig. 4 is folded.

Fig. 6 is a perspective view showing a part of the completed state of the battery pack shown in fig. 4.

Fig. 7 is a perspective view showing a cap part of a battery case according to the related art.

Fig. 8 is a perspective view showing a battery case composed of two cap parts shown in fig. 7.

Fig. 9 is a vertical sectional view showing a state in which a battery is housed in the battery case shown in fig. 8.

Detailed Description

Hereinafter, various embodiments of the present invention will be described with reference to the drawings.

< first embodiment >

Fig. 1 is a perspective view showing a battery pack 1 according to a first embodiment of the present invention, and fig. 2 is a perspective view showing a state before folding the battery pack 1. In the present embodiment, the battery case 1 shown in fig. 1 is manufactured from the state after the integral molding process (before folding) shown in fig. 2 through the folding operation shown in fig. 3A to 3B, in which fig. 3A is a sectional view taken along the line iii-iii of fig. 2; fig. 3B is a sectional view showing a state after being folded along a first folding line from the state shown in fig. 3A; fig. 3C is a sectional view showing a completed state after being folded along the second folding line from the state shown in fig. 3B.

The battery case 1 in each of the above figures is produced by drawing a flat laminated film 2. Here, laminate film 2 is made of, for example, a metal layer such as aluminum or stainless steel (SUS), and a film having a sealant layer such as polypropylene, but is not limited thereto. The thickness of the laminate film 2 is set to a thickness sufficient to seal an all-solid-state battery described later while ensuring its flexibility.

By drawing the flat laminated film 2, a battery case 1 having two cap portions (i.e., a cap portion 5A and a cap portion 5B each having a cap shape with one end opened) connected in parallel 14 by a connecting portion is integrally formed. Since the cap-shaped portion 5A (first cap-shaped portion) and the cap-shaped portion 5B (second cap-shaped portion) are configured to be symmetrical to each other, only the cap-shaped portion 5A will be described as an example.

As shown in fig. 2 and 3A, the cap portion 5A has a cup portion 7 whose lower end is open. Cup-shaped portion 7 has a rectangular parallelepiped shape, and includes a lateral wall (upper wall) 9 extending in the left-right direction in the drawing, and three vertical walls 10 extending downward from each of the front side, the rear side, and the right side of the four sides of lateral wall 9, with the open end thereof facing downward. The hat portion 5A further includes three flat portions 11 extending horizontally from the lower ends of the three vertical walls 10.

As shown in fig. 3A, of the cap-shaped portion 5A and the cap-shaped portion 5B, the cap-shaped portion 5A located on the right side in the figure is configured such that no vertical wall is formed on the left side in the figure of the lateral wall 9; the hat portion 5B located on the left side in the figure is configured such that no vertical wall is formed on the right side of the lateral wall 9 in the figure.

The cap-shaped portion 5A and the cap-shaped portion 5B are connected by a connecting portion 14 between the sides of the lateral wall 9 where no vertical wall is formed. The connecting portion 14 is formed in a flat shape extending horizontally, and as shown in fig. 3A, the lateral wall 9 of the cap portion 5A and the lateral wall 9 of the cap portion 5B are connected by the flat connecting portion 14 to form a single flat plate, that is, the two lateral walls 9 and the connecting portion 14 extend on the same plane.

First, the connecting portion 14a connecting the connecting portion 14 and the lateral wall 9 of the cap portion 5A is formed as a first folding line, and the connecting portion 14 is folded downward along the first folding line, that is, toward the cap portion 5A side, whereby the battery case 1 is changed from the state before being folded as shown in fig. 3A to the folded state as shown in fig. 3B. In fig. 3B, the connecting portion 14 is bent 90 ° counterclockwise along the first folding line. As the connecting portion 14 meanders, the cap portion 5B moves below the connecting portion 14.

Then, the connecting portion 14B connecting the connecting portion 14 and the lateral wall 9 of the cap portion 5B is formed as a second fold line, and the lateral wall 9 of the cap portion 5B is folded by 90 ° counterclockwise along the second fold line, so that the state shown in fig. 3C is obtained. In fig. 3C, the cap portion 5A is located on the upper side; the cap 5B is located on the lower side, the lateral wall 9 of the upper cap 5A vertically faces the lateral wall 9 of the lower cap 5B, the upper half of the connecting portion 14 is a left vertical wall 10 'of the cap 5A, and the lower half of the connecting portion 14 is a left vertical wall 10' of the cap 5B. The right vertical wall 10 of the upper hat-shaped portion 5A and the right vertical wall 10 of the lower hat-shaped portion 5B are located on the same plane in the vertical direction. In this state, the flat portions 11 on three sides (except the left side in fig. 3C) of the cap portion 5A are respectively overlapped and joined to the flat portions 11 on three sides (except the left side in fig. 3C) of the cap portion 5B up and down, thereby constituting the battery cartridge 1 shown in fig. 1.

In the battery case 1 of the present embodiment, as shown in fig. 1 and 3C, the two cap-shaped portions (the cap-shaped portion 5A and the cap-shaped portion 5B) and the connecting portion 14 constitute an accommodating space 21, and the all-solid-state battery is accommodated in the accommodating space 21.

Here, the all-solid battery 20 (not shown in detail) is an all-solid battery stack including one or more all-solid battery cells. The all-solid-state battery cell has a positive electrode collector layer, a positive electrode active material layer, a solid electrolyte layer, a negative electrode active material layer, and a negative electrode collector layer.

The top wall of the accommodation space 21 is formed by the transverse wall 9 of the upper hat-shaped part 5A; the bottom wall of the accommodating space 21 is formed by the transverse wall 9 of the lower hat-shaped part 5B; the front side wall, the rear side wall, and the right side wall of the accommodating space 21 in fig. 1 are respectively formed by vertically abutting the vertical wall 10 of the upper hat-shaped portion 5A and the vertical wall 10 of the lower hat-shaped portion 5B; the left side wall of the accommodation space 21 in fig. 1 is formed by the straight connection portion 14. Accordingly, the height of the vertical wall 10 of each cup 7 is half of the height of the housing space 21, and the length dimension of the connection portion 14 is the same as the height dimension of the housing space 21.

Sealing material, not shown, is applied to the front, rear, and right sides of the housing space 21 in fig. 1 at the positions where the ends of the vertical walls 10 of the respective cup-shaped portions 7 abut against each other, so as to ensure the sealing property of the housing space 21. The flat portion 11 of the cap portion 5A and the flat portion 11 of the cap portion 5B are joined together by a joining machine 25 (see fig. 3C) in a state of being overlapped in the vertical direction, and the housing space 21 is enclosed and closed on the front side, the rear side, and the right side in fig. 1.

As described above, in the present embodiment, the battery case 1 is integrally molded into two cap-shaped portions (5A, 5B) connected in parallel by the connecting portion 14, and the lateral walls 9 of the two cap-shaped portions (5A, 5B) and the connecting portion 14 are connected to form a single flat plate. Therefore, since there is no negative angle when the battery case 1 is integrally molded, the battery case 1 can be easily processed with high quality without the difficulty in removing the mold.

Further, since the connecting portion 14 serves as one side wall (the left side wall in fig. 1) of the housing space 21 in which the all-solid battery 20 is housed, the flat portion 11 for bonding does not need to be provided on this side. Therefore, the battery case 1 can be reduced in size by the flat portion 11 on the side, and the space arrangement efficiency of the battery case 1 in a vehicle or the like can be improved.

In addition, when the housing space 21 is sealed, two flat portions 11, which are overlapped in the upper and lower direction on the front side, the rear side, and the right side of the housing space 21 in fig. 1, are joined to each other by the joining machine 25, except for the left side of fig. 1 where the connecting portion 14 is a side wall. Therefore, compared with the prior art structure that four flat parts on the periphery of the accommodating space d need to be jointed by the jointing machine e, the jointing parts are reduced, and the manufacturing efficiency can be improved.

< second embodiment >

Fig. 4 is a sectional view showing a state before folding a battery case 50 according to a second embodiment of the present invention. As in the battery cartridge 1 of the first embodiment, the battery cartridge 50 of the present embodiment is also configured to have no negative angle when integrally molded. Hereinafter, only the battery cartridge 50 different from the battery cartridge 1 will be described.

As shown in fig. 4, when the battery case 50 is in a state before being folded, the two cap portions (the cap portion 51A and the cap portion 51B) are connected in parallel in the left-right direction of fig. 4, and the cup portions 52 of the cap portion 51A (the first cap portion) and the cap portion 51B (the second cap portion) have adjacent vertical walls 53 (the cup portion 52 of the right cap portion 51A is on the left side, and the cup portion 52 of the left cap portion 51B is on the right side). The two vertical walls 53 are inclined so as to be closer to each other as they are located lower, and their respective lower ends are integrally connected to each other at a point P. That is, the two vertical walls 53 of the cap 51A and the cap 51B facing each other form a V-shaped or U-shaped connecting portion 55.

Fig. 5 is a cross-sectional view showing a state in which the connection part 55 of the battery case 50 shown in fig. 4 is folded. As shown in fig. 5, the accommodation space 57 is formed by using the center line (point P) of the V-shaped or U-shaped bottom of the connection portion 55 as a folding line, and by folding the connection portion 55 in the clockwise direction along the folding line in a state where the right cap portion 51A is positioned below the left cap portion 51B in fig. 4 and the lateral wall 53 of the cap portion 51B and the lateral wall 53 of the cap portion 51A are vertically opposed to each other.

Fig. 6 is a perspective view showing a part of the completed state of the battery case 50. As shown in fig. 6, in battery case 50, the flat portion is omitted from the right side (point P side) of receiving space 57 in fig. 6, and flat portion 59 of cap 51A and flat portion 59 of cap 51B overlap and join on the other three sides. Thus, the battery cartridge 50 is also miniaturized as in the above-described battery cartridge 1.

In the battery case 50 of the present embodiment, since the connecting portion 55 has a V-shape or a U-shape, the right side surface of the accommodating space 57 in fig. 6 is not located on the same plane, but two inclined vertical walls 53 protrude outward (right side in fig. 5) with the point P as the apex, as shown in fig. 6.

In addition, although the battery case 50 of the present embodiment is configured such that the cap portion 51A is folded clockwise about the point P as a fulcrum, the cap portion 51A may be bent at a point PR below the point P shown in fig. 5; the cap portion 51B is bent at a point PL above the point P shown in fig. 5 so that the cap portion 51A and the cap portion 51B are folded in two to form a shape in which the point P shown by a dotted line in fig. 5 is recessed toward the inside of the accommodating space 57. Thus, the battery case 50 can be further reduced in size.

The present invention is not limited to the embodiments described above, and can be modified as appropriate. For example, in the battery case 1 of the first embodiment described above, in the state before folding as shown in fig. 2, each of the two cap-shaped portions (5A, 5B) has a cup-shaped portion 7 with its open end facing downward, and the lateral walls (upper walls) 9 of the two cup-shaped portions 7 are connected to each other by a connecting portion 14 and are located on the same plane. However, as another state before folding, the battery case 1 in the state before folding shown in fig. 2 may be turned upside down, and the lateral walls (lower walls) 9 of the respective cup-shaped portions 7 may be connected by the connecting portions 14, with the open ends thereof facing upward. In this case, the connection portion 14a and the connection portion 14b are respectively formed as a first folding line and a second folding line, and the cap portion 5A and the connection portion 14 are sequentially folded by 90 ° clockwise, so that the two lateral walls 9 can be vertically opposed to each other to form the housing space 21.

Claims

1. A battery case, which is manufactured by drawing and has a housing space for housing an all-solid battery, is characterized in that:

the battery case is integrally formed as two cap-shaped parts connected in parallel by a connecting part,

each of the cap-shaped portions has a lateral wall having one side connected to the connecting portion, three longitudinal walls extending from three sides of the lateral wall not connected to the connecting portion, respectively, and flat portions extending horizontally from end portions of the three longitudinal walls, respectively,

the accommodating space is a space formed by folding the two hat-shaped parts into a state that the transverse walls of the two hat-shaped parts are opposite up and down and the flat parts of the two hat-shaped parts are overlapped.

2. A battery pack as claimed in claim 1, wherein:

the two cap-shaped parts are a first cap-shaped part and a second cap-shaped part, the transverse wall of the first cap-shaped part and the transverse wall of the second cap-shaped part are connected into a whole flat plate by the straight connecting part,

the connecting part is connected with the transverse wall of the first hat-shaped part to form a first folding line, the connecting part is connected with the transverse wall of the second hat-shaped part to form a second folding line,

the receiving space is a space in which the connecting portion is bent along the first fold line toward the first hat-shaped portion side in a right-angle shape and the lateral wall of the second hat-shaped portion is bent along the second fold line toward the first hat-shaped portion side in a right-angle shape so as to be vertically opposed to the lateral wall of the first hat-shaped portion,

in the accommodating space, the top wall is formed by the transverse wall of the first hat-shaped part; the bottom wall is formed by the transverse wall of the second hat-shaped part; the side wall of one side is formed by the connecting part; the side walls of the other three sides are formed by vertically butting vertical walls of the first cap-shaped part and the second cap-shaped part.

3. A battery pack as claimed in claim 1, wherein:

the two cap-shaped parts are a first cap-shaped part and a second cap-shaped part, the transverse wall of the first cap-shaped part is connected with the transverse wall of the second cap-shaped part through the connecting part with the V-shaped or U-shaped section,

the center line of the V-shaped or U-shaped bottom of the connecting part is taken as a fold line,

the accommodating space is formed by the connecting part being bent along the fold line to form a state that the first hat-shaped part is positioned below the second hat-shaped part and the transverse wall of the second hat-shaped part is vertically opposite to the transverse wall of the first hat-shaped part,

in the accommodating space, the top wall is formed by the transverse wall of the first hat-shaped part; the bottom wall is formed by the transverse wall of the second hat-shaped part; the side wall of one side is formed by the folded connecting part; the side walls of the other three sides are formed by vertically butting vertical walls of the first cap-shaped part and the second cap-shaped part.

4. A battery pack as claimed in claim 2 or 3, wherein:

the flat parts of the first cap-shaped part and the second cap-shaped part surrounding three sides of the accommodating space are overlapped and jointed up and down, so that the accommodating space is closed.