Battery pack housing, battery pack

Abstract

To provide a technology that suppresses an amount of heat generated by a cell battery.SOLUTION: A first storage unit 100a and a second storage unit 100b can store a cell battery 400. A first connection plate 200 is connected to a sealing body 420 when the cell batteries 400 are stored in the first storage unit 100a and the second storage unit 100b. A second connection plate 300 is connected to a bottom surface 416 of a battery case 410 when the cell batteries 400 are stored in the first storage unit 100a and the second storage unit 100b. At least one of a first type through hole 120 provided around the sealing body 420 and a rib structure provided on a wall surface 110 surrounding a side surface 414 of the battery case 410 is provided.SELECTED DRAWING: Figure 4

Description

[Technical field]

[0001] The present disclosure relates to a battery pack housing and a battery pack, and more particularly to a battery pack housing and a battery pack that house a battery cell. [Background technology]

[0002] A battery cell such as a lithium-ion secondary battery has an insulating layer between a positive electrode plate and a negative electrode plate, which electrically insulates the positive electrode plate and holds an electrolyte. When the insulating layer is broken by conductive powder (foreign matter) attached to the surfaces of the positive electrode plate, the negative electrode plate, and the insulating layer, the positive electrode plate and the negative electrode plate are electrically connected to each other, 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 the 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 a nail penetration test. In the nail penetration test, a nail is penetrated into the battery cell from the outside, the positive electrode plate and the negative electrode plate are short-circuited by the nail, and changes in the temperature and voltage of the battery cell caused by the Joule heat generated are measured (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] WO 12 / 117660 Summary of the Invention [Problem to be solved by the invention]

[0004] A battery pack is formed by storing a plurality of unit cells such as battery cells. In a battery pack, if heat is generated in one unit cell due to an internal short circuit, this heat may be transferred to the other unit cells, resulting in thermal runaway. In order to prevent such thermal runaway, it is necessary to suppress the amount of heat generated by one unit cell even if heat is generated in the unit cell due to an internal short circuit.

[0005] The present disclosure has been made in consideration of these circumstances, and has an object to provide a technique for suppressing the amount of heat generated by a single cell. [Means for solving the problem]

[0006] 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 the 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 connects to the sealing body when the unit cell is stored in the storage section, and a flat second connecting plate that connects 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. Another aspect of the present disclosure is also a battery pack housing. This battery pack housing includes 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 closes the opening of the battery case in an electrically insulated state and also serves as the first electrode, a storage section capable of storing a single cell including an opening that penetrates the sealing body, a flat first connection plate that is connected to the sealing body when the single 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 cell is stored in the storage section. The storage section includes a rib structure provided on a side wall that surrounds the 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 embodiment of the present disclosure is also a battery pack housing. The battery pack housing includes 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 closes the opening of the battery case in an electrically insulated state and also serves as the first electrode, a storage section capable of storing a single cell including an opening that penetrates the sealing body, a flat first connection plate that is connected to the sealing body when the single 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 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 embodiment of the present disclosure is also a battery pack housing. This battery pack housing includes 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 closes the opening of the battery case in an electrically insulating state and also serves as the first electrode, a storage section capable of storing a single cell including an opening that penetrates the sealing body, a flat first connecting plate that is connected to the sealing body when the single 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 single cell is stored in the storage section. The storage section includes a through hole provided around the periphery of the sealing body and a through hole provided in a side wall that surrounds the side surface of the battery case. Rib structure When the through holes included in the storage section are referred to as first type through holes, the first connecting plate includes second type through holes, and the area of ​​the first type through holes and the cross-sectional area of ​​the spaces between the ribs of the rib structure are larger than the area of ​​the second type through holes.

[0007] Yet another embodiment of the present disclosure is a battery pack, which includes a cylindrical battery case with a bottom 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 closes the opening of the battery case in an electrically insulating state and also serves 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 a 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. . Effect of the Invention

[0008] According to the present disclosure, the amount of heat generated by a single cell can be reduced. [Brief description of the drawings]

[0009] [Figure 1] 1(a)-(b) are diagrams showing the structure of a battery pack according to this embodiment. [Diagram 2] 2(a)-(b) are diagrams showing the structure of the unit cell of FIGS. 1(b)-(c). [Diagram 3] 3(a)-(c) are diagrams showing an overview of the occurrence of thermal runaway in the unit cell of FIG. [Figure 4] 4(a)-(e) are diagrams showing the detailed structure of the battery pack of FIGS. 1(a)-(c). DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0010] Before specifically describing this embodiment, the knowledge on which the present invention 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 unit cells. When the unit cells are lithium ion secondary batteries, an internal short circuit may occur between the positive and negative plates due to destruction of the insulating layer by conductive powder or contraction of the insulating layer at high temperatures. When an internal short circuit occurs between the positive and negative plates, the short circuit part may further expand due to Joule heat accompanying the short circuit current, and abnormal heating may occur, which may destroy the unit cells. When the abnormal heating generated in the unit cells is transmitted to other unit cells in this way, the other unit cells may also experience abnormal heating, which may cause thermal runaway. In the following description, "parallel" and "perpendicular" include not only perfect parallel and perpendicular, but also cases where the parallel and perpendicular are deviated within the margin of error. In addition, "approximately" means that the two are roughly the same.

[0011] 1(a)-(b) show the structure of a battery pack 1000. FIG. 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 of, for example, 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 connecting plates 200 are attached to the first storage section 100a, and a plurality of second connecting plates 300 are attached to the third storage section 100c. The first connecting plates 200 and the second connecting plates 300 are electrically conductive metallic flat plates.

[0012] Fig. 1(b) is a perspective view showing the internal structure of the second storage section 100b in Fig. 1(a). Inside the second storage section 100b, cells 400 collectively referred to as first cells 400a and the like 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.

[0013] 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 battery case 410 having a bottomed cylindrical shape and a sealing body 420 that closes the opening of the battery case 410 in an electrically insulating 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 surface 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 disposed in the center of the upper surface 412. The bottom surface 416 also serves as the negative electrode 432. The sealing body 420 includes an opening 422 penetrating 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 referred to as a first electrode, the negative electrode 432 is referred to as a second electrode.

[0014] 2(b) is a cross-sectional view of the unit cell 400 perpendicular to the top surface 412 and the side surface 414. The unit 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 a main active material, and the negative electrode plate 470 has special carbon as a main active material. The separator 460 is an insulating layer impregnated with an electrolyte.

[0015] As shown in FIG. 1(b), the plurality of 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" cells 400. In the plurality of 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 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 cells 400 included in the third group 500c, the positive electrode 430 faces upward and the negative electrode 432 faces downward. In this way, the positive electrodes 430 are upside down in adjacent groups 500. 1(a), 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. 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.

[0016] Before describing the structure of the battery pack 1000 for suppressing the occurrence of thermal runaway in more detail, the mechanism of thermal runaway occurrence based on a nail penetration test on the unit cell 400 will be described here. Figures 3(a)-(c) show an overview of thermal runaway occurrence by the unit cell 400. In Figure 3(a), a nail 10 is pierced into the side surface 414 of the unit cell 400. Figure 3(b) shows a state following Figure 3(a), in which the nail 10 is pierced into the unit cell 400, (i) the positive electrode plate 450 and the negative electrode plate 470 come into contact (short circuit), and Joule heat is generated. (ii) The Joule heat causes the crystals of the positive electrode 430 to collapse, and oxygen is generated. (iii) Heat is generated by the reaction between the lithium of the negative electrode 432 and the electrolyte. (iv) Oxygen and 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).

[0017] Furthermore, the heat generated by the battery cell 400 melts the resin of the storage section 100, particularly the first storage section 100a, and the molten resin closes the open section 422. Closing the open section 422 makes it difficult for the gas to be released to the outside of the battery cell 400. As a result, the heated gas accumulates inside the battery cell 400, further increasing the amount of heat inside the battery cell 400.

[0018] Fig. 3(c) shows a state following Fig. 3(b), in which when the electric cell 400 reaches a critical point due to Joule heat, combustion heat, and high-temperature gas, the high-temperature 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.

[0019] 4(a)-(e) show a detailed structure of the battery pack 1000. FIG. 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 a cell 400 arranged at the outermost periphery among the plurality of cells 400, for example, the first cell 400a to the ninth cell 400i and the eighteenth cell 400r in FIG. 1(b). The cell 400 is accommodated 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.

[0020] 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 block 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 block the opening 422, that is, the amount of the first storage section 100a that is melted, a plurality of first type through holes 120 are provided in the first storage section 100a. For example, the plurality of first type through holes 120 are provided around the sealing body 420, particularly around the opening 422.

[0021] 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 connecting 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 sector faces the first connecting plate 200. However, as shown in FIG. 4(b), in the sector shape of the first type through hole 120, the arc of the sector may face the second connecting plate 300. In addition, the first storage section 100a is formed of resin as described above, but may contain a thermally conductive material to facilitate heat dissipation from the sealing body 420.

[0022] FIG. 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.

[0023] Fig. 4(d) shows a cross-sectional view taken along line A-A' in Fig. 4(a). As described above, the cell 400 has a cylindrical shape, and therefore the side surface 414 of the battery case 410 has a circular shape in the cross-sectional view. The side surface 414 is surrounded by the wall surface 110 of the second storage section 100b. A plurality of ribs 112 protruding toward the side surface 414 are discretely arranged on the wall surface 110, and a space 114 is formed between the space 114 and the wall surface 110 in a portion where the ribs 112 are not arranged.

[0024] Such ribs 112 and space 114 cause the wall surface 110 to have a rib structure. The rib structure of the wall surface 110 extends in the vertical direction between the first connection plate 200 and the second connection plate 300. Due to the rib structure of the wall surface 110, the melted first storage part 100a easily flows downward through the space 114 toward the second connection plate 300. As a result, the melted first storage part 100a is suppressed from heading toward the opening part 422. As shown in the figure, the height of the rib 112 is indicated as "Ic", and the width of the rib 112 is indicated as "Fc".

[0025] Also, the formation of the space 114 facilitates heat dissipation from the battery case 410. Further, a conductive material 130 is disposed at the tip portion of the rib 112. The conductive material 130 is a heat-conductive material. The arrangement of the conductive material 130 also facilitates heat dissipation from the battery case 410.

[0026] FIG. 4(e) shows a cross-sectional view of the B-B' line in FIG. 4(a), that is, a cross-sectional view of the portion below FIG. 4(d). In FIG. 4(e), a rib-structured wall surface 110 is provided in the second storage part 100b as in FIG. 4(a). As shown in the figure, 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. That is, the rib 112 is higher on the first connection plate 200 side than on the second connection plate 300 side. Also, the width of the rib 112 is narrower on the first connection plate 200 side than on the second connection plate 300 side. From this, the size of one space 114 is wider on the first connection plate 200 side than on the second connection plate 300 side. Since the size of one space 114 is widened on the first connection plate 200 side, the melted first storage part 100a easily flows through the space 114 of the rib structure.

[0027] When 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", Y < X, Z. For example, the cross-sectional area at the uppermost end of the side surface 414 is "Z". Therefore, the melted first storage part 100a more easily passes through the space 114 than through the second type through-hole 210.

[0028] 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 melted first storage section 100a can be reduced. In addition, since the amount of the melted first storage section 100a 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 cell 400 can be suppressed. In addition, since the amount of heat generated by the cell 400 is suppressed, the occurrence of thermal runaway can be suppressed. In addition, since the wall surface 110 of the second storage section 100b is provided with a rib structure, 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.

[0029] In addition, since at least one of the first type through holes 120 and the rib structure is provided for the unit cells 400 arranged on the outermost periphery, the number of at least one of the first type through holes 120 and the rib structure can be reduced. In addition, since the cross section of the first type through hole 120 has a sector shape, it is possible to ensure strength when the first connecting plate 200 is crimped from above to the first storage section 100a. In addition, in the sector shape of the first type through hole 120, the arc of the sector faces the first connecting plate 200, so the degree of freedom of the structure can be improved. In addition, in the sector shape of the first type through hole 120, the arc of the sector faces the second connecting plate 300, so the degree of freedom of the structure can be improved.

[0030] In addition, in the rib structure of the second storage section 100b, the ribs 112 are higher on the first connecting plate 200 side than on the second connecting plate 300 side, so that the molten first storage section 100a can flow more easily. In addition, in the rib structure of the second storage section 100b, the width of the ribs 112 is narrower on the first connecting plate 200 side than on the second connecting plate 300 side, so that the molten first storage section 100a can flow more easily. In addition, the rib structure of the second storage section 100b extends between the first connecting plate 200 and the second connecting plate 300, so that the molten first storage section 100a can flow more easily.

[0031] Moreover, since the rib 112 contains a thermally conductive material, it is possible to improve the heat dissipation performance of the battery cell 400. Furthermore, since the first storage section 100a contains a thermally conductive material around the sealing body 420, it is possible to improve the heat dissipation performance of the battery cell 400. Furthermore, since 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, it is possible to facilitate flow through the rib structure while reducing the amount of melted first storage section 100a.

[0032] An overview of one embodiment of the present disclosure is as follows: A battery pack housing (900) according to one embodiment 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 insulating state, a storage section (100) capable of storing a cell (400) including an opening (422) that penetrates the sealing body (420), a flat first connecting plate (200) that is connected to the sealing body (420) when the cell (400) is stored in the storage section (100), and a flat second connecting plate (300) that is connected to the bottom surface of the battery case (410) when the 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 a side wall (110) surrounding the side surface (414) of the battery case (410).

[0033] The storage section (100) is capable of storing a plurality of unit cells (400), and may include at least one of a through hole (120) and a rib structure for the unit cells (400) that are arranged at the outermost periphery among the plurality of unit cells (400).

[0034] The cross section of the through hole (120) may have a sector shape.

[0035] In the sector shape of the through-hole (120), the arc of the sector faces the first connecting plate (200).

[0036] In the sector shape of the through-hole (120), the arc of the sector faces the second connecting plate (300).

[0037] 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).

[0038] In the ribbed structure of the storage section (100), the ribs (112) are higher on the first connecting plate (200) side than on the second connecting plate (300) side.

[0039] In the ribbed structure of the storage section (100), the width of the rib (112) is narrower on the side of the first connecting plate (200) than on the side of the second connecting plate (300).

[0040] The rib structure of the housing (100) extends between the first connecting plate (200) and the second connecting plate (300).

[0041] The ribs (112) of the ribbed structure include a thermally conductive material.

[0042] In the storage section (100), a thermally conductive material is included around the sealing body (420).

[0043] 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 spaces between the ribs (112) of the ribbed structure are larger than the area of ​​the second-type through holes (210).

[0044] Another aspect of the present disclosure is a battery pack. The 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 cell (400) including an opening (422) that penetrates the sealing body (420), a storage section (100) capable of storing the cell (400), a flat first connecting plate (200) that is connected to the sealing body (420) when the cell (400) is stored in the storage section (100), and a flat second connecting plate (300) that is connected to the bottom surface of the battery case (410) when the 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 a side wall (110) surrounding the side surface (414) of the battery case (410).

[0045] The present disclosure has been described above based on the embodiments. These embodiments are merely illustrative, and it will be understood by those skilled in the art that various modifications are possible in the combination of each component or each treatment process, and that such modifications are also within the scope of the present disclosure.

[0046] In this embodiment, the storage section 100 includes the first-type through holes 120 and a rib structure. However, the present invention is not limited to this, and for example, only one of the first-type through holes 120 and the rib structure may be provided. According to this modification, the structure can be simplified.

[0047] 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 thereto, and for example, the arc of the fan in some of the multiple first type through holes 120 may face the first connecting plate 200 and the arc of the fan in the remaining multiple first type through holes 120 may face the second connecting plate 300. According to this modification, the degree of freedom of the structure can be improved. [Explanation of symbols]

[0048] 10 nail, 100 storage section, 110 wall surface, 112 rib, 114 space, 120 first type through hole (through hole), 130 conductive material, 200 first connecting plate, 210 second type through hole, 300 second connecting 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

1. 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 has a through hole provided in the first storage section facing a side surface of the unit cell.

2. A battery pack housing comprising:

2. The battery pack casing 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 arranged at the outermost periphery among the plurality of unit cells.

3. The battery pack housing according to claim 1 , wherein a cross section of the through hole has a sector shape.

4. The battery pack housing according to claim 3 , wherein the through hole has a sector shape, and an arc of the sector faces the first connecting plate.

5. The battery pack housing according to claim 3 , wherein the through hole has a sector shape, and an arc of the sector faces the second connection plate.

6. The battery pack housing of 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 toward the first connection plate, and in the remaining plurality of through holes, the arcs of the fan face toward the second connection plate.

7. 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.

8. 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.

9. The battery pack housing according to claim 7 or 8, wherein the rib structure of the storage portion extends between the first connecting plate and the second connecting plate.

10. 9. The battery pack housing according to claim 7, wherein the ribs of the ribbed structure contain a thermally conductive material.

11. 3. The battery pack housing according to claim 1, wherein the storage section includes a thermally conductive material around the sealing body.

12. 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.

13. 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 storage section has a through hole provided in the first storage section facing a side surface of the unit cell. Including battery pack.

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