JP7627883B2 - Battery pack housing, battery pack - Google Patents

Description

This disclosure relates to a battery pack housing and a battery pack, and in particular to a battery pack housing and a battery pack that house a single battery.

A battery cell such as a lithium-ion secondary battery has an insulating layer between the positive and negative plates that electrically insulates the plates and retains the electrolyte. When the insulating layer is broken by conductive powder (foreign matter) attached to the surfaces of the positive and negative plates, the positive and negative plates become electrically conductive, causing an internal short circuit. Once an internal short circuit occurs, the battery cell may be destroyed by Joule heat caused by the short circuit current. On the other hand, in order to ensure the safety of a battery cell even if an internal short circuit occurs in the battery cell, it is important to properly evaluate the safety of the battery cell when an internal short circuit occurs. One example of such an evaluation test is the nail penetration test. In the nail penetration test, a nail is penetrated into the battery cell from the outside, the positive and negative plates are short-circuited by the nail, and the changes in temperature and voltage of the battery cell caused by the Joule heat generated are measured (see, for example, Patent Document 1).

WO 12/117660

A battery pack is formed by storing multiple single cells, such as battery cells. In a battery pack, if heat is generated in one single cell due to an internal short circuit, this heat may be transferred to the other single cells, causing thermal runaway. In order to prevent the occurrence of such thermal runaway, it is necessary to suppress the amount of heat generated by one single cell, even if heat is generated in that single cell due to an internal short circuit.

This disclosure has been made in light of these circumstances, and its purpose is to provide a technology that reduces the amount of heat generated by a single cell.

In order to solve the above problems, a battery pack housing according to an embodiment of the present disclosure includes a bottomed cylindrical battery case that doubles as the second electrode of a first electrode and a second electrode that are different from each other, a sealing body that closes an opening of the battery case in an electrically insulated state and doubles as the first electrode, a storage section capable of storing a unit cell including an opening that penetrates the sealing body, a flat first connecting plate that is connected to the sealing body when the unit cell is stored in the storage section, and a flat second connecting plate that is connected to a bottom surface of the battery case when the unit cell is stored in the storage section. The storage section has a second storage section that surrounds a side surface of the battery case of the unit cell and a first storage section that surrounds the sealing body of the unit cell, and the storage section includes a through hole provided in the first storage section that faces the side surface of the unit cell.
Another aspect of the present disclosure is also a battery pack housing. The battery pack housing includes a bottomed cylindrical battery case that doubles as the second electrode of a first electrode and a second electrode that are different from each other, a sealing body that closes the opening of the battery case in an electrically insulating state and doubles as the first electrode, a storage section capable of storing a unit cell including an opening that penetrates the sealing body, a flat first connection plate that is connected to the sealing body when the unit cell is stored in the storage section, and a flat second connection plate that is connected to the bottom surface of the battery case when the unit cell is stored in the storage section. The storage section includes a rib structure provided on a side wall that surrounds a side surface of the battery case, and the rib structure of the storage section has a higher rib on the first connection plate side than on the second connection plate side.
Yet another aspect of the present disclosure is also a battery pack housing. The battery pack housing includes a bottomed cylindrical battery case that doubles as the second electrode of a first electrode and a second electrode that are different from each other, a sealing body that closes the opening of the battery case in an electrically insulating state and doubles as the first electrode, a storage section capable of storing a unit cell including an opening that penetrates the sealing body, a flat first connection plate that is connected to the sealing body when the unit cell is stored in the storage section, and a flat second connection plate that is connected to the bottom surface of the battery case when the unit cell is stored in the storage section. The storage section includes a rib structure provided on a side wall that surrounds a side surface of the battery case, and the rib structure of the storage section has a narrower rib width on the first connection plate side than on the second connection plate side.
Yet another aspect of the present disclosure is also a battery pack housing. The battery pack housing includes a bottomed cylindrical battery case that doubles as the second electrode of a first electrode and a second electrode that are different from each other, a sealing body that closes the opening of the battery case in an electrically insulated state and doubles as the first electrode, a storage section capable of storing a single battery cell including an opening that penetrates the sealing body, a flat first connection plate that is connected to the sealing body when the single battery cell is stored in the storage section, and a flat second connection plate that is connected to the bottom surface of the battery case when the single battery cell is stored in the storage section. The storage section includes a through hole provided around the sealing body and a rib structure provided on a side wall surrounding a side surface of the battery case, and when the through hole included in the storage section is referred to as a first type through hole, the first connection plate includes a second type through hole, and the area of the first type through hole and the cross-sectional area of the space between the ribs of the rib structure are larger than the area of the second type through hole.

Yet another aspect of the present disclosure is a battery pack. The battery pack includes a cylindrical battery case with a bottom that doubles as the second electrode of a first electrode and a second electrode that are different from each other, a sealing body that closes the opening of the battery case in an electrically insulated state and doubles as the first electrode, a unit cell including an opening that penetrates the sealing body, a storage section capable of storing the unit cell, a flat first connecting plate that is connected to the sealing body when the unit cell is stored in the storage section, and a flat second connecting plate that is connected to the bottom surface of the battery case when the unit cell is stored in the storage section. The storage section has a second storage section that surrounds a side surface of the battery case of the unit cell and a first storage section that surrounds the sealing body of the unit cell, and the storage section includes a through hole provided in the first storage section that faces the side surface of the unit cell .

This disclosure makes it possible to reduce the amount of heat generated by a single cell.

1(a) and 1(b) are diagrams showing the structure of a battery pack according to this embodiment. 2(a)-(b) are diagrams showing the structure of the unit cell of FIGS. 1(b)-(c). 3(a) to (c) are diagrams showing an overview of the occurrence of thermal runaway in the unit cell of FIG. 4(a)-(e) are diagrams showing the detailed structure of the battery pack of FIGS. 1(a)-(c).

Before describing this embodiment in detail, the knowledge on which it is based will be described. This embodiment relates to a battery pack. A battery pack housing (hereinafter referred to as the "battery pack housing") houses a plurality of single cells. When the single cells are lithium ion secondary batteries, an internal short circuit may occur between the positive and negative plates due to the destruction of the insulating layer by conductive powder or the shrinkage of the insulating layer at high temperatures. When an internal short circuit occurs between the positive and negative plates, the short circuit area may expand further due to Joule heat caused by the short circuit current, and abnormal heating may occur, which may destroy the single cells. If the abnormal heating generated in the single cell is transmitted to other single cells in this way, the other single cells may also experience abnormal heating, which may cause thermal runaway. In the following description, "parallel" and "perpendicular" include not only completely parallel and perpendicular, but also cases where the parallel and perpendicular are deviated within the margin of error. In addition, "approximately" means that they are approximately the same.

Figures 1(a)-(b) show the structure of the battery pack 1000. Figure 1(a) is a perspective view showing the exterior of the battery pack 1000. The battery pack 1000 includes a battery pack housing 900, which includes a first storage section 100a, a second storage section 100b, and a third storage section 100c, which are collectively referred to as storage sections 100, a plurality of first connection plates 200, and a plurality of second connection plates 300 (not shown). The storage section 100 is a container having a box shape, and is formed, for example, from resin. The storage section 100 includes a plate-shaped first storage section 100a arranged in an upper portion, a plate-shaped third storage section 100c arranged in a lower portion, and a second storage section 100b arranged between the first storage section 100a and the third storage section 100c. A plurality of first connection plates 200 are attached to the first storage section 100a, and a plurality of second connection plates 300 are attached to the third storage section 100c. The first connection plates 200 and the second connection plates 300 are conductive metal flat plates.

Figure 1(b) is a perspective view showing the internal structure of the second storage section 100b in Figure 1(a). Inside the second storage section 100b, cells 400 collectively referred to as the first cell 400a are stored. Here, as an example, 175 cells 400 are stored, but the number of cells 400 stored in the second storage section 100b is not limited to this.

2(a)-(b) show the structure of the single battery 400. FIG. 2(a) is an external view of the single battery 400. The single battery 400 includes a battery case 410, a sealing body 420, an opening 422, a positive electrode 430, and a negative electrode 432. The single battery 400 has a cylindrical shape and includes a bottomed cylindrical battery case 410 and a sealing body 420 that closes the opening of the battery case 410 in an electrically insulated state. The shape of the single battery 400 is not limited to a cylindrical shape, and may be a pouch shape or a rectangular shape. Here, the upper surface of the sealing body 420 is a circular upper surface 412, the side of the battery case 410 is a side surface 414, and the lower surface of the battery case 410 is a circular side surface 414. The battery case 410 and the sealing body 420 are made of, for example, steel. A positive electrode 430 that protrudes upward is arranged in the center of the upper surface 412. The bottom surface 416 is also the negative electrode 432. The sealing body 420 includes an opening 422 that penetrates the sealing body 420. The opening 422 is a through hole for releasing gas generated inside the cell 400 to the outside of the cell 400. When the positive electrode 430 is called the first electrode, the negative electrode 432 is called the second electrode.

Figure 2(b) is a cross-sectional view of the cell 400 perpendicular to the top surface 412 and side surface 414. The cell 400 incorporates a positive electrode plate 450, a separator 460, and a negative electrode plate 470, which have a spiral structure wound in a spiral shape. For example, the positive electrode plate 450 has lithium cobalt oxide as the main active material, and the negative electrode plate 470 has special carbon as the main active material. The separator 460 is an insulating layer impregnated with an electrolyte.

As shown in FIG. 1B, the plurality of single cells 400 are classified into a first group 500a to a seventh group 500g. The first group 500a to the seventh group 500g are collectively referred to as groups 500, and each group 500 includes "25" single cells 400. In the plurality of single cells 400 included in the first group 500a, the positive electrode 430 faces upward and the negative electrode 432 faces downward. In the plurality of single cells 400 included in the second group 500b, the negative electrode 432 faces upward and the positive electrode 430 faces downward. In the plurality of single cells 400 included in the third group 500c, the positive electrode 430 faces upward and the negative electrode 432 faces downward. In this way, in adjacent groups 500, the positive electrodes 430 are upside down. In addition, the negative electrodes 432 of the cells 400 included in the second group 500b and the positive electrodes 430 of the cells 400 included in the third group 500c are connected to one first connection plate 200 as shown in FIG. 1(a). Furthermore, the negative electrodes 432 of the cells 400 included in the first group 500a and the positive electrodes 430 of the cells 400 included in the second group 500b are connected to one second connection plate 300. The first connection plate 200 and the second connection plate 300 are similarly connected to the other groups 500, so that the groups 500 in the second storage section 100b are connected in series.

Before describing the structure of the battery pack 1000 for suppressing thermal runaway in more detail, the mechanism of thermal runaway based on a nail penetration test on a single cell 400 will be described here. Figures 3(a)-(c) show an overview of thermal runaway caused by a single cell 400. In Figure 3(a), a nail 10 is pierced into the side 414 of the single cell 400. Figure 3(b) shows a state following Figure 3(a), in which the nail 10 is pierced into the single cell 400, (i) the positive electrode plate 450 and the negative electrode plate 470 come into contact (short circuit), generating Joule heat. (ii) The Joule heat causes the crystals of the positive electrode 430 to collapse, generating oxygen. (iii) Heat is generated by the reaction between the lithium of the negative electrode 432 and the electrolyte. (iv) Oxygen and the carbon of the negative electrode 432 undergo a combustion reaction, generating further heat. (v) The electrolyte is gasified by the increase in the amount of heat generated in the cycles (i) to (iii).

In addition, heat generation from the single battery 400 melts the resin in the storage section 100, particularly the first storage section 100a, and the molten resin closes the open section 422. By closing the open section 422, it becomes difficult for gas to be released to the outside of the single battery 400. As a result, the heated gas accumulates inside the single battery 400, further increasing the amount of heat inside the single battery 400.

Figure 3(c) shows the state following Figure 3(b), where when the electric cell 400, whose heat generation has increased due to Joule heat, combustion heat, and hot gas, reaches a critical point, the hot gas is released to the outside. As a result, the heat is transferred to other electric cells 400, causing thermal runaway. In addition, the bottom surface 416 is blown off by the release of the gas containing heat.

Figures 4(a)-(e) show the detailed structure of the battery pack 1000. Figure 4(a) is a partial cross-sectional view of the battery pack 1000 showing the periphery of one cell 400. Here, the cell 400 is the cell 400 arranged at the outermost periphery among the multiple cells 400, for example, the first cell 400a to the ninth cell 400i and the eighteenth cell 400r in Figure 1(b). The cell 400 is stored in the second storage section 100b. At this time, the positive electrode 430 in the sealing body 420 is connected to the first connection plate 200, and the negative electrode 432 in the bottom surface 416 of the battery case 410 is connected to the second connection plate 300.

The side surface 414 of the cell 400 is surrounded by the second storage section 100b, and the sealing body 420 is mainly surrounded by the first storage section 100a. When the cell 400 generates heat as shown in FIG. 3(a)-(b), the first storage section 100a may melt and close the opening 422 of the sealing body 420. In this embodiment, in order to reduce the amount of the first storage section 100a that may close the opening 422, that is, the amount of the first storage section 100a that is melted, the first storage section 100a is provided with a plurality of first type through holes 120. For example, the plurality of first type through holes 120 are provided around the sealing body 420, particularly around the opening 422.

The first type through hole 120 penetrates the first storage section 100a with a sector-shaped cross section. This is to ensure strength when the first connection plate 200 is crimped from above to the first storage section 100a. As an example, in the sector shape of the first type through hole 120, the arc of the fan faces the first connection plate 200. However, as shown in FIG. 4(b), in the sector shape of the first type through hole 120, the arc of the fan may face the second connection plate 300. In addition, as described above, the first storage section 100a is formed of resin, but may contain a thermally conductive material to facilitate heat dissipation from the sealing body 420.

Figure 4 (c) shows a top view of a portion of the first connection plate 200. The first connection plate 200 is provided with a plurality of second-type through holes 210. The second-type through holes 210 are provided, for example, at a location other than the positive electrode 430 on the sealing body 420. This can also be said to be provided around the sealing body 420 or around the opening 422. The second-type through holes 210 direct the molten first storage section 100a toward the upper side of the first connection plate 200. As a result, the molten first storage section 100a is prevented from moving toward the opening 422.

Figure 4(d) shows a cross-sectional view taken along line A-A' in Figure 4(a). As described above, the cell 400 has a cylindrical shape, and therefore in the cross-sectional view, the side surface 414 of the battery case 410 has a circular shape. The side surface 414 is surrounded by the wall surface 110 of the second storage section 100b. A plurality of ribs 112 that protrude toward the side surface 414 are discretely arranged on the wall surface 110, and in the portion where the ribs 112 are not arranged, a space 114 is formed between the space 114 and the wall surface 110.

The wall surface 110 has a ribbed structure due to the ribs 112 and spaces 114. The ribbed structure of the wall surface 110 extends in the vertical direction between the first connecting plate 200 and the second connecting plate 300. The ribbed structure of the wall surface 110 makes it easier for the molten first storage section 100a to flow downward through the space 114 toward the second connecting plate 300. As a result, the molten first storage section 100a is prevented from moving toward the open section 422. As shown, the height of the rib 112 is indicated as "Ic" and the width of the rib 112 is indicated as "Fc".

The formation of the space 114 also makes it easier for heat to be released from the battery case 410. Furthermore, a conductive material 130 is disposed at the tip portion of the rib 112. The conductive material 130 is a thermally conductive material. The arrangement of the conductive material 130 also makes it easier for heat to be released from the battery case 410.

Figure 4(e) shows a cross-sectional view of the line B-B' in Figure 4(a), that is, a portion lower than Figure 4(d). In Figure 4(e), a wall surface 110 with a rib structure is provided in the second storage section 100b, similar to Figure 4(a). As shown, the height of the rib 112 is indicated as "Ia" and the width of the rib 112 is indicated as "Fa". Here, Ia < Ic and Fa > Fc. In other words, the rib 112 is higher on the first connecting plate 200 side than on the second connecting plate 300 side. Also, the width of the rib 112 is narrower on the first connecting plate 200 side than on the second connecting plate 300 side. As a result, the size of one space 114 is wider on the first connecting plate 200 side than on the second connecting plate 300 side. Since the size of each space 114 is wider on the first connecting plate 200 side, the molten first storage section 100a can easily flow through the space 114 of the rib structure.

If the opening area of one first type through hole 120 is "X", the opening area of one second type through hole 210 is "Y", and the cross-sectional area of one space 114 is "Z", then Y < X, Z. For example, the cross-sectional area of the top end of the side surface 414 is "Z". Therefore, the molten first storage section 100a can pass through the space 114 more easily than the second type through hole 210.

According to this embodiment, the first type through holes 120 of the first storage section 100a are provided around the sealing body 420, so that the amount of the first storage section 100a that is melted can be reduced. In addition, since the amount of the first storage section 100a that is melted is reduced, the open section 422 can be made less likely to be blocked. In addition, since the open section 422 is made less likely to be blocked, the amount of heat generated by the single battery 400 can be suppressed. In addition, since the amount of heat generated by the single battery 400 is suppressed, the occurrence of thermal runaway can be suppressed. In addition, since a rib structure is provided on the wall surface 110 of the second storage section 100b, the melted first storage section 100a can be made to flow easily. In addition, since the melted first storage section 100a can be made to flow easily through the space 114 of the rib structure, the open section 422 can be made less likely to be blocked.

In addition, at least one of the first type through holes 120 and the rib structure is provided for the single cells 400 arranged at the outermost periphery, so that the number of at least one of the first type through holes 120 and the rib structure can be reduced. In addition, the cross section of the first type through hole 120 has a fan shape, so that the strength can be ensured when the first connecting plate 200 is crimped from above to the first storage section 100a. In addition, in the fan shape of the first type through hole 120, the arc of the fan faces the first connecting plate 200, so that the degree of freedom of the structure can be improved. In addition, in the fan shape of the first type through hole 120, the arc of the fan faces the second connecting plate 300, so that the degree of freedom of the structure can be improved.

In addition, in the rib structure of the second storage section 100b, the ribs 112 are higher on the first connection plate 200 side than on the second connection plate 300 side, making it easier for the molten first storage section 100a to flow. In addition, in the rib structure of the second storage section 100b, the width of the ribs 112 is narrower on the first connection plate 200 side than on the second connection plate 300 side, making it easier for the molten first storage section 100a to flow. In addition, the rib structure of the second storage section 100b extends between the first connection plate 200 and the second connection plate 300, making it easier for the molten first storage section 100a to flow.

In addition, the ribs 112 contain a thermally conductive material, which can improve the heat dissipation performance of the cells 400. In addition, in the first storage section 100a, a thermally conductive material is contained around the sealing body 420, which can improve the heat dissipation performance of the cells 400. In addition, the area of the first type through hole 120 and the cross-sectional area of the space 114 are larger than the area of the second type through hole 210, which can reduce the amount of melted first storage section 100a while allowing the rib structure to flow more easily.

An overview of one aspect of the present disclosure is as follows. A battery pack housing (900) of one aspect of the present disclosure includes a bottomed cylindrical battery case (410) that also serves as the second electrode (432) of a first electrode (430) and a second electrode (432) that are different from each other, a sealing body (420) that also serves as the first electrode (430) by closing the opening of the battery case (410) in an electrically insulated state, a storage section (100) capable of storing a single cell (400) including an opening (422) that penetrates the sealing body (420), a flat first connection plate (200) that is connected to the sealing body (420) when the single cell (400) is stored in the storage section (100), and a flat second connection plate (300) that is connected to the bottom surface of the battery case (410) when the single cell (400) is stored in the storage section (100). The storage section (100) includes at least one of a through hole (120) provided around the periphery of the sealing body (420) and a rib structure provided on the side wall (110) surrounding the side surface (414) of the battery case (410).

The storage section (100) can store a plurality of single cells (400), and may include at least one of a through hole (120) and a rib structure for the single cell (400) that is arranged at the outermost periphery among the plurality of single cells (400).

The cross section of the through hole (120) may be sector-shaped.

When the through hole (120) is in a sector shape, the arc of the sector faces the first connecting plate (200).

In the sector shape of the through hole (120), the arc of the sector faces the second connecting plate (300).

The storage section (100) includes a plurality of through holes (120), some of which have arcs of a fan facing the first connecting plate (200), and the remaining of which have arcs of a fan facing the second connecting plate (300).

In the rib structure of the storage section (100), the rib (112) is higher on the first connecting plate (200) side than on the second connecting plate (300) side.

In the rib structure of the storage section (100), the width of the rib (112) is narrower on the first connecting plate (200) side than on the second connecting plate (300) side.

The rib structure of the storage section (100) extends between the first connecting plate (200) and the second connecting plate (300).

The ribs (112) of the ribbed structure include a thermally conductive material.

The storage section (100) includes a thermally conductive material around the sealing body (420).

When the through holes (120) included in the storage section (100) are referred to as first-type through holes (120), the first connecting plate (200) may include second-type through holes (210). The area of the first-type through holes (120) and the cross-sectional area of the space between the ribs (112) of the rib structure are larger than the area of the second-type through holes (210).

Another aspect of the present disclosure is a battery pack. This battery pack includes a bottomed cylindrical battery case (410) that also serves as the second electrode (432) of a first electrode (430) and a second electrode (432) that are different from each other, a sealing body (420) that also serves as the first electrode (430) by closing the opening of the battery case (410) in an electrically insulating state, and a single battery (400) including an opening (422) that penetrates the sealing body (420), a storage section (100) that can store the single battery (400), a flat first connection plate (200) that is connected to the sealing body (420) when the single battery (400) is stored in the storage section (100), and a flat second connection plate (300) that is connected to the bottom surface of the battery case (410) when the single battery (400) is stored in the storage section (100). The storage section (100) includes at least one of a through hole (120) provided around the periphery of the sealing body (420) and a rib structure provided on the side wall (110) surrounding the side surface (414) of the battery case (410).

The present disclosure has been described above based on examples. These examples are merely illustrative, and it will be understood by those skilled in the art that various modifications are possible in the combination of each of the components or each of the processing processes, and that such modifications are also within the scope of the present disclosure.

In this embodiment, the storage section 100 has a first type through hole 120 and a rib structure. However, this is not limited to this, and for example, only one of the first type through hole 120 and the rib structure may be provided. This modified example allows for a simplified structure.

In this embodiment, in the first type through holes 120, the arc of the fan faces the first connecting plate 200 or the arc of the fan faces the second connecting plate 300. However, this is not limited to the above, and for example, in some of the multiple first type through holes 120, the arc of the fan faces the first connecting plate 200, and in the remaining multiple first type through holes 120, the arc of the fan faces the second connecting plate 300. This modified example can improve the degree of freedom of the structure.

10 nail, 100 storage section, 110 wall surface, 112 rib, 114 space, 120 first type through hole (through hole), 130 conductive material, 200 first connection plate, 210 second type through hole, 300 second connection plate, 400 single cell, 410 battery case, 412 top surface, 414 side surface, 416 bottom surface, 420 sealing body, 422 opening, 430 positive electrode, 432 negative electrode, 450 positive electrode plate, 460 separator, 470 negative electrode plate, 900 battery pack housing, 1000 battery pack.

Claims (13)

a storage section capable of storing a single cell, the storage section including a bottomed cylindrical battery case that also serves as the second electrode of a first electrode and a second electrode that are different from each other, a sealing body that also serves as the first electrode by closing an opening of the battery case in an electrically insulating state, and an opening that penetrates the sealing body;
a first connecting plate having a flat shape that is connected to the sealing body when the battery cell is housed in the housing portion;
a flat second connection plate that is connected to a bottom surface of the battery case when the battery is housed in the housing portion,
the storage section includes a second storage section that surrounds a side surface of a battery case of the battery cell, and a first storage section that surrounds a sealing body of the battery cell,
The storage section is a battery pack housing including a through hole provided in the first storage section facing a side surface of the battery cell. The battery pack housing according to claim 1, wherein the storage section is capable of storing a plurality of the unit cells, and includes the through-hole for the unit cell that is arranged at the outermost periphery among the plurality of unit cells. The battery pack housing according to claim 1 or 2, wherein the cross section of the through hole has a sector shape. The battery pack housing according to claim 3, wherein the through hole has a sector shape, and the arc of the sector faces the first connection plate. The battery pack housing according to claim 3, wherein the through hole has a sector shape, and the arc of the sector faces the second connection plate. The battery pack housing according to claim 3, wherein the storage section includes a plurality of the through holes, and in some of the through holes, the arcs of the fan face the first connection plate, and in the remaining through holes, the arcs of the fan face the second connection plate. a storage section capable of storing a single cell, the storage section including a bottomed cylindrical battery case that also serves as the second electrode of a first electrode and a second electrode that are different from each other, a sealing body that also serves as the first electrode by closing an opening of the battery case in an electrically insulating state, and an opening that penetrates the sealing body;
a first connecting plate having a flat shape that is connected to the sealing body when the battery cell is housed in the housing portion;
a flat second connection plate that is connected to a bottom surface of the battery case when the battery is housed in the housing portion,
the storage section includes a rib structure provided on a side wall surrounding a side surface of the battery case,
The battery pack housing has a rib structure in which the ribs are higher on the first connection plate side than on the second connection plate side. a storage section capable of storing a single cell, the storage section including a bottomed cylindrical battery case that also serves as the second electrode of a first electrode and a second electrode that are different from each other, a sealing body that also serves as the first electrode by closing an opening of the battery case in an electrically insulating state, and an opening that penetrates the sealing body;
a first connecting plate having a flat shape that is connected to the sealing body when the battery cell is housed in the housing portion;
a flat second connection plate that is connected to a bottom surface of the battery case when the battery is housed in the housing portion,
the storage section includes a rib structure provided on a side wall surrounding a side surface of the battery case,
The battery pack housing has a rib structure in which the width of the rib is narrower on the first connection plate side than on the second connection plate side. The battery pack housing according to claim 7 or 8, wherein the rib structure of the storage section extends between the first connecting plate and the second connecting plate. The battery pack housing according to claim 7 or 8, wherein the ribs of the rib structure contain a thermally conductive material. The battery pack housing according to claim 1 or 2, wherein the storage section includes a thermally conductive material around the sealing body. a storage section capable of storing a single cell, the storage section including a bottomed cylindrical battery case that also serves as the second electrode of a first electrode and a second electrode that are different from each other, a sealing body that also serves as the first electrode by closing an opening of the battery case in an electrically insulating state, and an opening that penetrates the sealing body;
a first connecting plate having a flat shape that is connected to the sealing body when the battery cell is housed in the housing portion;
a flat second connection plate that is connected to a bottom surface of the battery case when the battery is housed in the housing portion,
the storage portion includes a through hole provided in a periphery of the sealing body and a rib structure provided in a side wall surrounding a side surface of the battery case,
When the through hole included in the storage portion is referred to as a first type through hole, the first connection plate includes a second type through hole,
an area of the first type through hole and a cross-sectional area of a space between the ribs of the rib structure are larger than an area of the second type through hole. a single battery including a bottomed cylindrical battery case that also serves as the second electrode of a first electrode and a second electrode that are different from each other, a sealing body that also serves as the first electrode by closing an opening of the battery case in an electrically insulating state, and an opening that penetrates the sealing body;
A storage section capable of storing the unit cell;
a first connecting plate having a flat shape that is connected to the sealing body when the battery cell is housed in the housing portion;
a flat second connection plate that is connected to a bottom surface of the battery case when the battery is housed in the housing portion,
the storage section includes a second storage section that surrounds a side surface of a battery case of the battery cell, and a first storage section that surrounds a sealing body of the battery cell,
The battery pack, wherein the storage section includes a through hole provided in the first storage section facing a side surface of the unit cell.

Images