WO2017042930A1

WO2017042930A1 - Battery device

Info

Publication number: WO2017042930A1
Application number: PCT/JP2015/075717
Authority: WO
Inventors: 中濱　敬文; 小林　武則
Original assignee: 株式会社東芝
Priority date: 2015-09-10
Filing date: 2015-09-10
Publication date: 2017-03-16
Also published as: JP6400853B2; JPWO2017042930A1

Abstract

The present invention readily suppresses temperature variations due to the position of a battery cell 2, and thus, may extend the life span thereof. The battery device (1) comprises a plurality of battery cells (2), and a casing (3). The plurality of battery cells are aligned, and spaced by a first spacing (S1) therebetween in a first direction (X). The casing houses the plurality of battery cells and comprises: a first wall portion (3e) extending along the first direction and extending along a second direction (Y) that intersects with the first direction, and provided with through holes (3s) facing the first spacing. The first opening ratio for the through holes in an inner region of the first wall portion, which is closer to the center position in the second direction of the first wall portion than to either first extremity portions in the second direction of the first wall portion, is greater than the second opening ratios for the through holes in the outer regions of the first wall portion, which are closer to either of the first extremity portions than to the center position.

Description

Battery device

Embodiments of the present invention relate to a battery device.

Conventionally, it has a plurality of battery cells arranged with a gap in the first direction and a housing that houses the plurality of battery cells, and a through-hole that faces the gap is provided in a wall portion of the housing. Battery devices are known.

JP 2014-022166 A

In this type of battery device, for example, it is preferable if a battery device with a smaller temperature variation depending on the location is obtained.

The battery device according to the embodiment includes, for example, a plurality of battery cells and a housing. The plurality of battery cells are arranged with a first gap in the first direction. The housing has a first wall portion extending along the first direction and provided with a through hole extending along a second direction intersecting the first direction and facing the first gap, A plurality of battery cells are accommodated. The first aperture ratio of the through hole in the inner region of the first wall portion closer to the center position in the second direction of the first wall portion than the first end portion in the second direction of the first wall portion However, it is larger than the 2nd opening ratio of the through-hole in the outer side area | region of the 1st wall part which is closer to a 1st edge part than a center position.

FIG. 1 is an exemplary perspective view of the battery device according to the first embodiment. 2 is a cross-sectional view taken along the line II-II in FIG. 3 is a cross-sectional view taken along the line III-III in FIG. 4 is a cross-sectional view taken along the line IV-IV in FIG. FIG. 5 is an exemplary cross-sectional view of the battery device according to the second embodiment. 6 is a cross-sectional view taken along the line VI-VI in FIG. FIG. 7 is an exemplary cross-sectional view of the battery device according to the third embodiment. 8 is a cross-sectional view taken along the line VIII-VIII in FIG. FIG. 9 is an exemplary cross-sectional view of the battery device according to the fourth embodiment. 10 is a cross-sectional view taken along the line XX of FIG. FIG. 11 is an exemplary cross-sectional view of the battery device according to the fifth embodiment.

Hereinafter, exemplary embodiments of the present invention will be disclosed. The configuration of the embodiment shown below, and the operation and result (effect) brought about by the configuration are examples. The present invention can be realized by configurations other than those disclosed in the following embodiments. Further, according to the present invention, at least one of various effects (including derivative effects) obtained by the configuration can be obtained.

Also, the same components are included in the embodiments disclosed below. Therefore, below, the same code | symbol is provided to those similar components, and the overlapping description is abbreviate | omitted.

<First Embodiment>
As shown in FIG. 1, the battery device 1 (storage battery device, assembled battery device) includes, for example, a plurality of battery cells 2, a housing 3, a first duct 4, and

second ducts

5 and 6. . The battery device 1 is installed in various devices, machines, facilities, and the like, and is used as a power source for these various devices, machines, and facilities. For example, the battery device 1 can be used as a stationary power source such as a power source for a POS (Point Of Sales) system in addition to being used as a mobile power source such as an automobile power source. In addition, the number, arrangement | positioning, etc. of the battery cell 2 contained in the battery apparatus 1 are not limited to what is disclosed by this embodiment. The battery device 1 includes a conductive member (bus bar) for electrically connecting a plurality of battery cells 2, a monitoring board for monitoring the voltage and temperature of the battery cell 2, and a control board for battery control. Etc. may be included.

As shown in FIG. 1, the housing 3 is configured in a rectangular parallelepiped shape that is long in the horizontal direction (lateral direction, left-right direction, X direction, or Y direction). The housing 3 has a plurality of wall portions 3a to 3f. The housing 3 can be installed with at least one of the plurality of wall portions 3a to 3f, for example, the wall portion 3e in a posture along a plane. The wall 3e is an example of a first wall, and the housing 3 is an example of a first housing. In the following, for the sake of convenience, the direction is defined based on the posture of the wall 3e along the plane. The X direction is the short direction of the housing 3 and the thickness direction of the battery cell 2. The Y direction is the longitudinal direction of the housing 3 and the width direction of the battery cell 2. Further, the Z direction is the height direction of the housing 3 and the height direction of the battery cell 2. The X direction, the Y direction, and the Z direction are orthogonal to each other. In the present embodiment, the X direction is an example of the first direction, the Y direction is an example of the second direction, and the Z direction is an example of the third direction.

The battery cell 2 can be composed of, for example, a lithium ion secondary battery. The battery cell 2 may be another secondary battery such as a nickel metal hydride battery, a nickel cadmium battery, or a lead storage battery. A lithium ion secondary battery is a kind of non-aqueous electrolyte secondary battery, and lithium ions in the electrolyte are responsible for electrical conduction. Examples of the positive electrode material include lithium manganese composite oxide, lithium nickel composite oxide, lithium cobalt composite oxide, lithium nickel cobalt composite oxide, lithium manganese cobalt composite oxide, spinel type lithium manganese nickel composite oxide, and olivine. A lithium phosphorus oxide having a structure is used, and as the negative electrode material, for example, an oxide material such as lithium titanate (LTO), an oxide material such as niobium composite oxide, or the like is used. Moreover, as electrolyte (for example, electrolyte solution), lithium salt, such as fluorine-type complex salt (for example, LiBF4, LiPF6), etc. were mix | blended, for example, ethylene carbonate, propylene carbonate, diethyl carbonate, ethyl methyl carbonate, dimethyl carbonate, etc. An organic solvent or the like may be used alone or in combination.

Further, the battery cell 2 has a housing 20. The housing 20 is configured in a flat rectangular parallelepiped shape that is thin in the X direction, for example. An electrode portion (not shown) or the like can be provided on the upper surface 20a (top surface) of the housing 20 shown in FIG. The plurality of battery cells 2 are arranged along the X direction in a posture in which each upper surface 20a faces the same direction (upward direction). In the present embodiment, a plurality of (for example, four) battery cells 2 are arranged in the row L1 arranged in the X direction, and on the one side in the Y direction of the row L1, that is, on the right side in FIGS. Column L2 in which two battery cells 2 are arranged in the X direction, and a row L3 in which a plurality of (for example, four) battery cells 2 are arranged in the X direction on one side in the Y direction of the row L2. Yes. The column L1 is an example of a first column, the column L2 is an example of a second column, and the column L3 is an example of a third column. The housing 20 is an example of a second housing.

As shown in FIGS. 1 to 4, the wall 3a and the wall 3c of the housing 3 are both in the direction intersecting or perpendicular to the Y direction, that is, along the X and Z directions, and the Y direction. Are provided in parallel with each other at intervals. The wall 3b and the wall 3d are both along the direction intersecting or orthogonal to the X direction, that is, along the Y direction and the Z direction, and are provided in parallel to each other with an interval in the X direction. . The wall portions 3a to 3d can be referred to as side wall portions or the like. The wall 3e and the wall 3f are both in the direction intersecting or orthogonal to the Z direction, that is, along the X direction and the Y direction, and are provided in parallel to each other with an interval in the Z direction. . The wall 3e can be referred to as a lower wall or a bottom wall. The wall 3f can be referred to as an upper wall, a top wall, or the like.

As shown in FIGS. 3 and 4, the housing 3 has, for example, a wall portion 3 g along the

wall portions

3 e and 3 f. The wall portion 3g is located between the wall portion 3e and the wall portion 3f, and spans between the wall portion 3a and the wall portion 3c and between the wall portion 3b and the wall portion 3d. The wall 3g may be provided with an opening through which the electrode portion of the battery cell 2 passes. In addition, a conductive member that connects the electrode portions of the battery cell 2, a substrate, and the like can be accommodated in the space between the wall 3g and the wall 3f. The wall 3g can also be referred to as a partition wall or a partition wall.

As shown in FIG. 2, the plurality of battery cells 2 are supported by the housing 3 with a gap S1 in the X direction. The gap S1 extends along the side surface of the battery cell 2, that is, along the Y direction and the Z direction. In addition, one end of the rows L1 to L3 in the X direction, that is, between the uppermost battery cell 2 and the wall 3d in FIG. 2, and the other end in the X direction, that is, the most in FIG. A gap S2 is provided between the lower battery cell 2 and the wall 3b. The gap S2 extends along the side surface and the

wall portions

3a and 3b of the battery cell 2, that is, along the Y direction and the Z direction. As shown in FIGS. 2 and 4, in the present embodiment, the width along the X direction of the gap S 1 is substantially the same as the width along the X direction of the gap S 2. The gap S1 is an example of a first gap, and the gap S2 is an example of a second gap. In the present embodiment, a protruding portion or the like that slightly protrudes toward the inside (center side) in the Z direction is provided in a portion facing the gaps S1 and S2 such as the wall portion 3e and the wall portion 3g. Yes. A plurality of battery cells 2 can be supported by the protrusions while maintaining the gaps S1 and S2.

Also, as shown in FIGS. 2 to 4, the wall 3e of the housing 3 is provided with a plurality of through holes 3s. The through hole 3s faces the gaps S1 and S2, and the through hole 3s and the gaps S1 and S2 are arranged in the Z direction. The plurality of through holes 3s are arranged at intervals in the X direction and the Y direction. As shown in FIG. 4, in the present embodiment, the through hole 3 s is not provided in the portion of the wall 3 e that faces the bottom surface of the battery cell 2. That is, the bottom surface of the battery cell 2 is covered with the wall 3e.

Further, as shown in FIG. 2, the

walls

3 a and 3 c of the housing 3 are provided with a plurality of through holes 3 t. The through hole 3t faces the gaps S1 and S2, and the through hole 3t and the gaps S1 and S2 are arranged in the Y direction. The plurality of through holes 3t are arranged at intervals in the X direction. The through hole 3t can be configured in a slit shape extending in the Z direction, for example. In the present embodiment, the through holes 3t are not provided in portions of the

walls

3a and 3c that face the side surfaces of the battery cell 2. That is, the side surface of the battery cell 2 is covered with the

walls

3a and 3c.

Therefore, in the gaps S1 and S2, as shown in FIG. 3, the wall 3e on the other side (lower side) in the Z direction in which the through hole 3s is provided, and the closed Z direction in which no opening is provided. 1 side (upper side) wall portion 3g faces, and both sides in the Y direction of the gaps S1, S2 are open. Therefore, the air flow flows from the first duct 4 into the gaps S1 and S2 through the through holes 3s, bends in the gaps S1 and S2 from the Z direction to both sides in the Y direction, and in the gaps S1 and S2. Flows into the

second ducts

5 and 6 through the through holes 3t (see FIG. 2).

Further, the housing 3 is configured by combining a plurality of parts (divided bodies). Specifically, the housing 3 includes, for example, a first housing member 31 (first case, lower case), a second housing member 32 (second case, upper case), and a third housing member 33. (Third case, lid). As shown in FIGS. 1 and 4, the first housing member 31 includes at least a wall 3e and a part (lower part) of the walls 3a to 3d. The second housing member 32 has at least a wall portion 3g and a part (upper portion) of the wall portions 3a to 3d. The third housing member 33 has at least a wall 3f. The second housing member 32 closes the housing portion of the first housing member 31 and is integrated with the first housing member 31. The third housing member 33 closes the housing portion of the second housing member 32 and is integrated with the second housing member 32. The first housing member 31, the second housing member 32, and the third housing member 33 can be coupled to each other by, for example, a coupling tool or an adhesive.

As shown in FIG. 1, the first duct 4 extends, for example, along the wall 3e of the housing 3, and is thin in the Z direction and spreads in the X direction and the Y direction. An opening 4 a is provided at the other end of the first duct 4 in the X direction. Further, as shown in FIG. 4, an opening 4 c is provided in the wall 4 b (upper wall) of the first duct 4. The opening 4c is aligned with the gaps S1 and S2 and the through hole 3s in the Z direction. That is, the opening 4c is provided in a portion of the wall 4b facing the gaps S1 and S2 and the through hole 3s. Portions other than the

openings

4a and 4c of the first duct 4 are closed. Therefore, the air (cooling air) introduced into the first duct 4 through the opening 4a passes through the first duct 4 and the gap between the housing 3 through the opening 4c and the through hole 3s. It can flow out into S1, S2. The first duct 4 is an example of an intake duct.

Also, as shown in FIG. 1, the

second ducts

5 and 6 are, for example, along the

wall portions

3a and 3c of the housing 3, and are thin in the Y direction and spread in the X and Z directions.

Openings

5a and 6a are provided at one end in the X direction of the

second ducts

5 and 6, respectively. Moreover, as FIG. 2 shows, opening

part

5c, 6c is provided in

wall part

5b, 6b (side wall part) of the

2nd ducts

5 and 6. As shown in FIG. The

openings

5c and 6c are aligned with the gaps S1 and S2 and the through hole 3t in the Y direction. That is, the

openings

5c and 6c are provided in a portion of the wall 5b facing the gaps S1 and S2 and the through hole 3t. Portions other than the

openings

5a, 6a, 5c, and 6c of the

second ducts

5 and 6 are closed. Therefore, the air introduced into the

second ducts

5 and 6 from the gaps S1 and S2 in the housing 3 through the

openings

5c and 6c passes through the

second ducts

5 and 6 and the opening 5a. , 6a can flow out of the

second ducts

5,6. The

second ducts

5 and 6 are an example of an exhaust duct.

Here, as shown in FIG. 3, in the present embodiment, the width W along the Y direction of the through hole 3 s is substantially within a range facing the battery cell 2 in the Z direction as viewed in FIG. 3. Are set the same. In addition, the width W along the Y direction of the through hole 3s and the width W along the Y direction of the wall 3e between the two through holes 3s are set to be substantially the same. In the range facing the battery cell 2 in the Z direction, odd numbers (for example, three) of the through holes 3s are provided, and the through holes 3s are provided at both ends of the range in the Y direction. Therefore, in the present embodiment, the two through holes 3s are connected to the boundary portion between the two battery cells 2 adjacent in the Y direction at a position facing the Z direction. With such a configuration, in the present embodiment, the first aperture ratio of the through hole 3s in the inner region T1 on the side of the center position C (center line, see FIG. 2) in the Y direction of the wall 3e is equal to that of the wall 3e. It becomes larger than the second aperture ratio of the through hole 3s in the outer region T2 on the end E side in the Y direction. Here, the aperture ratio is the ratio of the area of the through hole 3s (opening) to the area of the wall 3e. That is, the first aperture ratio is substantially equal to the ratio of the total value of the width W along the Y direction of all the through holes 3s provided in the inner region T1 to the length of the inner region T1, and the second opening The rate is substantially equal to the ratio of the total value of the width W along the Y direction of all the through holes 3s provided in the outer region T2 to the length of the outer region T2. In addition, the inner region T1 is a region closer to the center position C in the Y direction than the end portion E in the Y direction of the wall 3e, and is the region of the region in which the wall 3e is equally divided into four in the Y direction. Two areas inside. The outer region T2 is a region closer to the end E in the Y direction than the central position C in the Y direction of the wall 3e, and is a region of the wall 3e divided into four equal parts in the Y direction. The two outer areas. The end E is an example of a first end.

With the above-described configuration, as shown in FIG. 3, the air flow rate in the region near the center position C in the Y direction in the gaps S1 and S2 is in the region near the end E in the Y direction in the gaps S1 and S2. More than the air flow rate. Therefore, according to the present embodiment, in the inner region T1 in which the temperature of the battery cell 2 is likely to be higher than that in the outer region T2, the cooling property of the battery cell 2 by the air flow, that is, the heat dissipation from the battery cell 2 is likely to increase. .

In the present embodiment, the case where the plurality of battery cells 2 are arranged in 4 rows and 3 columns is exemplified, but the present invention is not limited to this. For example, 1 to 3 rows, 5 rows or more may be used. Up to 2 rows or 4 rows or more may be used.

As described above, in the present embodiment, for example, the inner region T1 of the wall 3e closer to the center position C in the Y direction of the wall 3e than the end E (first end) in the Y direction of the wall 3e. The first aperture ratio of the through-hole 3s at is larger than the second aperture ratio of the through-hole 3s in the outer region T2 of the wall 3e closer to the end E than the center position C. Therefore, according to the present embodiment, for example, the air flow rate in the region near the center position C in the Y direction in the gaps S1 and S2 is the air flow in the region near the end E in the Y direction in the gaps S1 and S2. More than the flow rate. Therefore, according to the present embodiment, in the inner region T1 in which the temperature of the battery cell 2 is likely to be higher than that in the outer region T2, the cooling property of the battery cell 2 by the air flow, that is, the heat dissipation from the battery cell 2 is likely to increase. . Therefore, for example, variations in the temperature of the battery cell 2 depending on the location can be easily suppressed, and thus the life of the battery device 1 can be extended.

In the present embodiment, for example, in the row L1 (first row) including the plurality of battery cells 2 arranged in the X direction (first direction) and the Y direction (second direction) of the row L1. A row L2 (second row) including a plurality of battery cells 2 positioned and arranged in the X direction (first direction). Therefore, according to the present embodiment, for example, the battery device 1 in which the heat dissipation of the inner region T1 is easily increased can be realized by the configuration in which a plurality of the rows L1 and L2 of the battery cells 2 are provided in the Y direction.

Second Embodiment
The battery device 1A of the embodiment shown in FIGS. 5 and 6 has the same configuration as the battery device 1 of the first embodiment. Therefore, also according to this embodiment, the same result (effect) based on the same configuration as that of the first embodiment can be obtained.

However, in this embodiment, for example, as shown in FIGS. 5 and 6, the inner region T 1 of the wall portion 3 e has a through hole 3 s having a width W 2 that is twice the width W, and half of the width W 2. A through hole 3s having a width W1 is provided. The through-hole 3s having the width W2 is provided so as to face the gaps S1 and S2 on the center position C side in the battery cell 2 in the row L2, and the through-hole 3s having the width W1 is an end portion in the battery cell 2 in the row L2. It is provided so as to face the gaps S1 and S2 on the E side. With such a configuration, also in the present embodiment, the first aperture ratio of the through hole 3s in the inner region T1 on the center position C (center line) side in the Y direction of the wall 3e is equal to the Y direction of the wall 3e. It becomes larger than the second aperture ratio of the through hole 3s in the outer region T2 on the end E side. Therefore, as shown in FIG. 6, the air flow rate in the region close to the center position C in the Y direction in the gaps S1 and S2 is the air flow rate in the region close to the end E in the Y direction in the gaps S1 and S2. More than. Therefore, also in this embodiment, in the inner region T1 in which the temperature of the battery cell 2 is likely to be higher than that in the outer region T2, the cooling performance of the battery cell 2 by the air flow, that is, the heat dissipation from the battery cell 2 is likely to increase.

<Third Embodiment>
The battery device 1B of the embodiment shown in FIGS. 7 and 8 has the same configuration as the battery device 1 of the first embodiment. Therefore, also according to this embodiment, the same result (effect) based on the same configuration as that of the first embodiment can be obtained.

However, in the present embodiment, as shown in FIGS. 7 and 8, for example, the inner region T1 of the wall 3e is provided with a through hole 3s having a width substantially the same as the length of the inner region T1. With such a configuration, also in the present embodiment, the first aperture ratio of the through hole 3s in the inner region T1 on the center position C (center line) side in the Y direction of the wall 3e is equal to the Y direction of the wall 3e. It becomes larger than the second aperture ratio of the through hole 3s in the outer region T2 on the end E side. Therefore, according to the present embodiment, as shown in FIG. 8, the air flow rate in the region near the center position C in the Y direction in the gaps S1 and S2 is the end E in the Y direction in the gaps S1 and S2. It tends to be larger than the air flow rate in the region close to. Therefore, for example, in the inner region T1 in which the temperature of the battery cell 2 is likely to be higher than that in the outer region T2, the cooling performance of the battery cell 2 by the air flow, that is, the heat dissipation from the battery cell 2 is further enhanced.

<Fourth embodiment>
The battery device 1C of the embodiment shown in FIGS. 9 and 10 has the same configuration as the battery device 1B of the third embodiment. Therefore, according to this embodiment, the same result (effect) based on the same configuration as that of the third embodiment can be obtained.

However, in the present embodiment, for example, as shown in FIGS. 9 and 10, a wall 3e having a width W3 that is three times the width W is provided in the outer region T2 of the wall 3e. Yes. With such a configuration, also in the present embodiment, the first aperture ratio of the through hole 3s in the inner region T1 on the center position C (center line) side in the Y direction of the wall 3e is equal to the Y direction of the wall 3e. It becomes larger than the second aperture ratio of the through hole 3s in the outer region T2 on the end E side. Therefore, as shown in FIG. 10, the air flow rate in the region close to the center position C in the Y direction in the gaps S1 and S2 is the air flow rate in the region close to the end E in the Y direction in the gaps S1 and S2. More likely to be more than. Therefore, according to the present embodiment, in the inner region T1 where the temperature of the battery cell 2 is likely to be higher than that in the outer region T2, the cooling property of the battery cell 2 by the air flow, that is, the heat dissipation from the battery cell 2 is further increased. Easy to increase.

<Fifth Embodiment>
The battery device 1D of the embodiment shown in FIG. 11 has the same configuration as the battery device 1C of the fourth embodiment. Therefore, also in this embodiment, the same result (effect) based on the same configuration as that of the fourth embodiment can be obtained.

However, in the present embodiment, for example, as shown in FIG. 11, the width of the gap S2 along the X direction is narrower than the width of the gap S1 along the X direction. In the case where the rows L1 to L3 of the plurality of battery cells 2 are provided in the housing 3, the two adjacent batteries are compared with the gap S2 (passage) between the

wall portions

3b and 3d and the battery cell 2. More heat is easily released into the gap S1 (passage) between the cells 2. According to the present embodiment, as described above, since the gap S2 is narrower than the gap S1, for example, the air flow rate in the gap S1 is larger than the air flow rate in the gap S2. Therefore, according to the present embodiment, the cooling performance of the battery cell 2 by the air flow at the central portion side in the X direction where the temperature of the battery cell 2 is likely to be higher than the end portion side in the X direction of the rows L1 to L3, that is, The heat dissipation from the battery cell 2 tends to increase. Therefore, for example, variation in the temperature of the battery cell 2 depending on the location is easily suppressed, and as a result, the life of the battery device 1D can be extended.

As mentioned above, although embodiment of this invention was illustrated, the said embodiment is an example to the last, Comprising: It is not intending limiting the range of invention. The above embodiment can be implemented in various other forms, and various omissions, replacements, combinations, and changes can be made without departing from the spirit of the invention. The above embodiments are included in the scope and gist of the invention, and are included in the invention described in the claims and the equivalents thereof. The present invention can be realized by configurations other than those disclosed in the above embodiments, and various effects (including derivative effects) obtained by the basic configuration (technical features) can be obtained. is there. In addition, the specifications of each component (structure, type, direction, shape, size, length, width, thickness, height, number, arrangement, position, material, etc.) should be changed as appropriate. Can do.

Claims

A plurality of battery cells arranged with a first gap in a first direction;
A first wall portion extending along the first direction and extending along a second direction intersecting the first direction and provided with a through hole facing the first gap, and A housing containing a plurality of battery cells;
With
The through hole in the inner region of the first wall portion that is closer to the center position in the second direction of the first wall portion than the first end portion in the second direction of the first wall portion. The first opening ratio of the battery device is larger than the second opening ratio of the through hole in the outer region of the first wall portion closer to the first end than the center position.
A first row including the plurality of battery cells arranged in the first direction;
A second row including the plurality of battery cells positioned in the second direction of the first row and arranged in the first direction;
The battery device according to claim 1, comprising:
The housing has a second wall portion that is positioned with a second gap in the first direction of the row including the plurality of battery cells,
The battery device according to claim 1, wherein the second gap is narrower than the first gap.