JP7270135B2 - storage battery module - Google Patents

Description

TECHNICAL FIELD The present disclosure relates to storage battery modules, and more particularly to storage battery modules that house a plurality of storage battery cells.

A plurality of storage battery cells are housed in the storage battery module. When a short circuit occurs in a storage battery cell, high temperature and high pressure gas is generated from the storage battery cell. In order to discharge this gas to the outside of the storage battery module, the storage battery module is provided with an exhaust path portion that is separated from the plurality of storage battery cells, and the exhaust path is connected to an exhaust port (see, for example, Patent Document 1). ).

WO 11/092773

If the cross-sectional area of the exhaust port is small, the amount of air (oxygen) inflow will be small, and if it is large, it will be large. When the amount of air (oxygen) flowing in is large, the combustion temperature inside the battery module rises, and the possibility of thermal runaway (spreading fire) not only in the battery that has run away from heat but also in its adjacent batteries increases.

The present disclosure has been made in view of such circumstances, and an object of the present disclosure is to provide a technique for suppressing thermal runaway (spreading of fire) in adjacent batteries due to high-temperature combustion of a thermally runaway battery.

In order to solve the above problems, a storage battery module according to one aspect of the present disclosure includes a plurality of storage battery cells having first electrodes and second electrodes facing opposite to each other, with the first electrodes facing in the same direction. a storage battery assembly to be arranged; a first surface facing the plurality of first electrodes in the storage battery assembly; a second surface facing the plurality of second electrodes in the storage battery assembly; a structure including a third surface and a fourth surface that intersect with the surface and face each other with the storage battery assembly sandwiched therebetween. The structure has a space surrounded by a plurality of first electrode-side surfaces, a first surface, a third surface, and a fourth surface of the battery assembly, and the structure includes the storage battery assembly in the space. An exhaust port is provided on the portion of the first surface located on the third surface side from the storage battery cell at the end of the third surface, or on the third surface. The storage battery assembly includes a first assembly including a plurality of storage battery cells having a first electrode that is a positive electrode and a second electrode that is a negative electrode; and a second assembly including a plurality of storage battery cells that are negative electrodes, and the space formed in the structure includes a surface on the side of the plurality of first electrodes, a first surface, a third surface, and a second surface of the first assembly. and a second space surrounded by the plurality of first electrode-side surfaces of the second assembly, the first surface, the third surface, and the fourth surface, and an exhaust port is a portion of the first space located closer to the third surface than the storage battery cell at the end of the third surface in the first assembly, or a first exhaust port disposed on the third surface; In the second space, a portion of the first surface located on the third surface side of the storage battery cell at the end of the third surface in the second assembly, or a second exhaust port located on the third surface, The storage battery module further comprises a partition separating the first space and the second space, the first space having one first exhaust port, the second space having one second exhaust port, The second space is smaller than the first space, and the second outlet is larger than the first outlet .
Another aspect of the invention is also a battery module. This device includes a storage battery assembly in which a plurality of storage battery cells having first electrodes and second electrodes facing opposite to each other are arranged with the first electrodes facing in the same direction, and a plurality of storage battery cells in the storage battery assembly. A first surface facing the first electrode, a second surface facing the plurality of second electrodes of the battery assembly, and the first surface and the second surface facing each other across the battery assembly while intersecting the first surface and the second surface a structure including a third surface and a fourth surface. The structure has a space surrounded by a plurality of first electrode-side surfaces, a first surface, a third surface, and a fourth surface of the battery assembly, and the structure includes the storage battery assembly in the space. An exhaust port is provided on the portion of the first surface located on the third surface side from the storage battery cell at the end of the third surface, or on the third surface. The storage battery assembly includes a first assembly including a plurality of storage battery cells in which the first electrode is a positive electrode and the second electrode is a negative electrode, and the first electrode is a negative electrode and the second electrode is a negative electrode. a second assembly that includes a plurality of storage battery cells that are positive electrodes, and the structure includes: A first space surrounded and a second space surrounded by a plurality of second electrode-side surfaces, a second surface, a third surface, and a fourth surface of the second aggregate are formed, and the structure includes a second A portion of the first surface located on the third surface side of the storage battery cell at the end of the third surface in the first assembly in the one space, or a first exhaust port on the third surface, and the second space , a portion of the second surface located closer to the third surface than the storage battery cell at the end of the third surface in the second assembly, or a second exhaust port is provided on the third surface, and the first space includes one first space The second space has an exhaust port, the second space has one second exhaust port, the second space is smaller than the first space, and the second exhaust port is larger than the first exhaust port.

According to the present disclosure, it is possible to suppress thermal runaway (fire spreading) in adjacent batteries due to high-temperature combustion of a thermally runaway battery.

It is a perspective view which shows the structure of the storage battery module which concerns on a present Example. FIG. 2 is an exploded perspective view showing the structure of the storage battery module of FIG. 1; FIG. 2 is another exploded perspective view showing the structure of the storage battery module of FIG. 1; FIG. 2 is a cross-sectional view showing the structure of the storage battery module of FIG. 1; FIG. 2 is another cross-sectional view showing the structure of the storage battery module of FIG. 1; 6(a) and 6(b) are diagrams showing an outline of gas discharge in the storage battery module of FIG. 1. FIG.

Before specifically describing the embodiments of the present disclosure, an overview of the embodiments will be described. This embodiment relates to a storage battery module in which a plurality of storage battery cells are housed. Each storage battery cell has a structure in which the positive electrode and the negative electrode face opposite to each other, for example, the positive electrodes are arranged in the same direction. When the storage battery cell is a lithium ion secondary battery, gas is generated in the storage battery cell when an internal short circuit or the like occurs. In addition, although the pressure inside the storage battery cell increases due to the generation of gas, the safety mechanism releases the gas from the positive electrode side to the outside of the storage battery cell. Such gas is of high temperature and high pressure, and when combustion occurs due to the gas, other storage battery cells in the storage battery module also undergo thermal runaway (fire spreads). This spread of fire may burn the entire storage battery module or the entire product. In order to suppress the spread of fire due to the gas, a space is provided between the structure of the storage battery and the surfaces of the plurality of storage battery cells on the positive electrode side, and the space is connected to an exhaust port. High-temperature gas from the storage battery cells is released into the space and out of the storage battery module through the exhaust port.

Under such circumstances, if the space has a structure divided into a plurality of parts, it becomes difficult for the gas to be discharged from one exhaust port. Therefore, the spread of fire due to the gas is likely to occur. On the other hand, when a plurality of exhaust ports are connected to one space, gas is easily discharged. However, when a plurality of exhaust ports are connected to one space, it becomes easier for air to flow into the space from outside the storage battery module, and high-temperature combustion by gas tends to occur. Therefore, a relationship between the space in the structure and the exhaust port is required to suppress high-temperature combustion by gas. In the storage battery module according to this embodiment, one air outlet is connected to one space. Therefore, when one space is formed in the structure, one exhaust port is provided in the structure. Moreover, when a plurality of spaces are formed in the structure, a plurality of exhaust ports are provided in the structure. Here, in general, the relationship is incomplete combustion temperature < complete combustion temperature, and if a large amount of air (oxygen) is sent in like a bellows without melting the metal, the combustion temperature becomes even higher. The candle wick is known to have an incomplete combustion of about 600°C and the flame tip to a temperature of over about 1000°C. In the following description, "parallel" and "perpendicular" include not only perfectly parallel and perpendicular, but also deviate from parallel and perpendicular within a margin of error. Moreover, "substantially" means that they are the same within an approximate range.

FIG. 1 is a perspective view showing the structure of a storage battery module 1000. FIG. As shown in FIG. 1, a Cartesian coordinate system is defined that includes x, y, and z axes. The x-axis and y-axis are orthogonal to each other within the bottom surface of the storage battery module 1000 . The z-axis is perpendicular to the x-axis and the y-axis and extends in the height (vertical) direction of the storage battery module 1000 . Also, the positive directions of the x-axis, y-axis, and z-axis are defined in the directions of the arrows in FIG. 1, and the negative directions are defined in directions opposite to the arrows. The positive direction of the x-axis is the "front side" or "front side", the negative direction of the x-axis is the "rear side" or "back side", and the positive direction of the z-axis is the "upper side" or "top side". , and the negative direction side of the z-axis is also called the “lower side” or the “bottom side”. Furthermore, the positive side of the y-axis is sometimes called the "right side", and the negative side of the y-axis is sometimes called the "left side".

The structure 100 includes a front housing 110 , a rear housing 130 and a right lid 352 . The front housing 110 includes a front surface 112 , a front lower surface 114 , a front upper surface 116 , a first front exhaust port 118 a to a fourth front exhaust port 118 d collectively referred to as a front exhaust port 118 , and a left side surface 150 . Rear housing 130 includes a rear surface 132 , a rear lower surface 134 , a rear upper surface 136 and a right side 152 . Components of the front housing 110 and the rear housing 130 are connected by screws, welding, adhesives, or the like, but a known technique may be used, so the description is omitted here.

A front surface 112 of the front housing 110 has a rectangular plate shape extending on the yz plane. A front lower surface 114 extends rearward from the lower end of the front surface 112 , a front upper surface 116 extends rearward from the upper end of the front surface 112 , and a left side 150 extends rearward from the left end of the front surface 112 . Extend. The front lower surface 114, the front upper surface 116, and the left side surface 150 all have a plate shape. The plate shape may be rectangular. Also, the rear surface 132 of the rear housing 130 has a rectangular plate shape extending on the yz plane. A rear lower surface 134 extends forward from the lower end of the rear surface 132 , a rear upper surface 136 extends forward from the upper end of the rear surface 132 , and a right side 152 extends forward from the right end of the rear surface 132 . . Each of the rear lower surface 134, the rear upper surface 136, and the right side surface 152 has a plate shape. The plate shape may be rectangular.

By connecting the rear end of the front lower surface 114 and the front end of the rear lower surface 134, the front lower surface 114 and the rear lower surface 134 form one lower surface. In addition, the front end of the front upper surface 116 and the front end of the rear upper surface 136 are connected, so that the front upper surface 116 and the rear upper surface 136 form one upper surface. The lower and upper surfaces intersect the anterior surface 112 and the posterior surface 132 . By connecting the front housing 110 and the rear housing 130 in this way, the structure 100 has a box shape. At this time, the right side of the structure 100 is covered with the right side 152 and the right lid 352, and the left side of the structure 100 is covered with the left side 150 and the left lid (not shown). Hereinafter, the front surface 112 may be referred to as the first surface, the rear surface 132 may be referred to as the second surface, the bottom surface may be referred to as the third surface, and the top surface may be referred to as the fourth surface. Here, the front housing 110 and the rear housing 130 are made of a material with high thermal conductivity, such as metal or carbon. Therefore, the front surface 112, the front lower surface 114, the front upper surface 116, the rear surface 132, the rear lower surface 134, and the rear upper surface 136 are metal plates, for example.

The structure of such a storage battery module 1000 is further described below with reference to FIGS. 2 to 5. FIG. FIG. 2 is an exploded perspective view showing the structure of the storage battery module 1000. FIG. FIG. 3 is another exploded perspective view showing the structure of the storage battery module 1000, showing the structure further disassembled from FIG. FIG. 4 is a cross-sectional view showing the structure of the storage battery module 1000, taken along line A-A' in FIG. FIG. 5 is another cross-sectional view showing the structure of the storage battery module 1000, and is a cross-sectional view taken along line B-B' in FIG.

A combination of a front case 240 and a rear case 250 is accommodated between the front case 110 and the rear case 130 . A combination of the front case 240 and the rear case 250 has a hollow box shape and is made of an insulating material such as resin. In this combination, the rear end of the front case 240 and the front end of the rear case 250 are connected, the front case 240 faces the front housing 110, and the rear case 250 faces the rear housing 130. . Inside the combination of the front side case 240 and the rear side case 250, a first storage battery assembly 200a to a seventh storage battery assembly 200g and a battery holder 230, collectively referred to as a storage battery assembly 200, are accommodated. In particular, the first battery assembly 200a, the second battery assembly 200b, . . . , the sixth battery assembly 200f, and the seventh battery assembly 200g are arranged in order from left to right. Therefore, it can be said that the lower surface and the upper surface face each other with the storage battery assembly 200 interposed therebetween. A plurality of storage battery cells 210 are arranged in each storage battery assembly 200 .

The storage battery cell 210 is, for example, a cylindrical lithium-ion secondary battery. A positive electrode 212 and a negative electrode 214 facing opposite to each other are arranged at both ends of the cylindrical shape of the storage battery cell 210 . A known technology may be used for the storage battery cell 210, and a safety mechanism is provided to release high-temperature, high-pressure gas to the outside when internal pressure rises due to an internal short circuit or the like. Generally, the high temperature and high pressure gas is released from the positive electrode 212 side.

Here, the plurality of storage battery cells 210 included in each of the first storage battery assembly 200a, the third storage battery assembly 200c, the fifth storage battery assembly 200e, and the seventh storage battery assembly 200g face the positive electrode 212 forward, The negative electrode 214 faces the rear side. Moreover, the plurality of storage battery cells 210 included in each of the second storage battery assembly 200b, the fourth storage battery assembly 200d, and the sixth storage battery assembly 200f have the positive electrodes 212 facing rearward and the negative electrodes 214 facing frontward. In other words, the direction of the positive electrode 212 is the same within one storage battery assembly 200, but the direction of the positive electrode 212 is opposite between two adjacent storage battery assemblies 200. FIG. When the electrode on the front side facing the front surface 112 is called a "first electrode" and the electrode on the rear side facing the rear surface 132 is called a "second electrode", in the first storage battery assembly 200a and the like, the first electrode The electrode is the positive electrode 212 and the second electrode is the negative electrode 214 . In addition, in the second storage battery assembly 200 b and the like, the first electrode is the negative electrode 214 and the second electrode is the positive electrode 212 .

Battery holder 230 fixes the position of each of the plurality of storage battery cells 210 by providing through holes into which each of the plurality of storage battery cells 210 can be inserted. The battery holder 230 is made of an insulating material such as resin. A front case 240 is attached to the front side of the plurality of storage battery cells 210 fixed by the battery holder 230 , and a rear case 250 is attached to the rear side of the plurality of storage battery cells 210 fixed by the battery holder 230 .

The front case 240 has a plate-shaped front case plate portion 244 extending in the yz plane, and the front case plate portion 244 is provided with a through hole at a position facing the positive electrode 212 of each storage battery cell 210 . A first front partition wall 242a is provided on the front surface of the front case plate portion 244 at the boundary between the second battery assembly 200b and the third battery assembly 200c. A second front partition wall 242b is provided at the boundary between the fourth battery assembly 200d and the fifth battery assembly 200e, and the boundary between the sixth battery assembly 200f and the seventh battery assembly 200g. is provided with a third front partition wall 242c. The first to third front partition walls 242a to 242c are collectively referred to as a front partition wall 242, and the front partition wall 242 protrudes forward and extends vertically.

The front surface of the front case plate portion 244 is divided into first front concave portions 246a to fourth front concave portions 246d by first front partition walls 242a to third front partition walls 242c. For example, the second front concave portion 246b is arranged at a portion sandwiched between the first front partition wall 242a and the second front partition wall 242b, that is, at a position facing the third storage battery assembly 200c and the fourth storage battery assembly 200d. The first front recess 246a and the third front recess 246c are similar to the second front recess 246b. On the other hand, since the fourth front recess 246d is arranged at a position facing only the seventh battery assembly 200g, it is narrower than the first front recess 246a to the third front recess 246c. Such first to fourth front recesses 246 a to 246 d are collectively referred to as front recesses 246 .

As shown in FIGS. 2 and 3, the first front lead plate 300a is fitted into the first front recess 246a, and the second front lead plate 300b is fitted into the second front recess 246b. A third front lead plate 300c is fitted into the third front recess 246c, and a fourth front lead plate 300d is fitted into the fourth front recess 246d. First front lead plate 300a to fourth front lead plate 300d are collectively referred to as front lead plate 300, and front lead plate 300 has a plate shape. The first front lead plate 300a is connected to the positive electrodes 212 of the plurality of storage battery cells 210 of the first storage battery assembly 200a and the negative electrodes 214 of the plurality of storage battery cells 210 of the second storage battery assembly 200b. A wiring pattern that electrically connects one positive electrode 212 and one negative electrode 214 is provided on the first front lead plate 300a. One storage battery cell 210 of the storage battery assembly 200b is connected in series. Here, a through hole is provided in a portion of the first front lead plate 300a that is connected to the positive electrode 212 . The second front lead plate 300b and the third front lead plate 300c are similar to the first front lead plate 300a. On the other hand, the fourth front lead plate 300d is connected only to the positive electrodes 212 of the plurality of battery cells 210 of the seventh battery assembly 200g. Therefore, the fourth front lead plate 300d is smaller than the first front lead plate 300a to the third front lead plate 300c.

The rear case 250 has a plate-shaped rear case plate portion 254 that extends in the yz plane. be done. As shown in FIG. 5, on the rear surface of the rear case plate portion 254, a first rear partition wall 252a is located at the boundary between the first battery assembly 200a and the second battery assembly 200b. is provided. A second rear partition wall 252b is provided at the boundary between the third battery assembly 200c and the fourth battery assembly 200d, and the boundary between the fifth battery assembly 200e and the sixth battery assembly 200f. A third rear partition wall 252c is provided at the position. The first rear partition 252a to the third rear partition 252c are collectively called a rear partition 252, and the rear partition 252 protrudes rearward and extends vertically.

The rear surface of the rear case plate portion 254 is divided into first rear concave portions 256a to fourth rear concave portions 256d by the first rear partition wall 252a to the third rear partition wall 252c. For example, the second rear recess 256b is arranged at a portion sandwiched between the first rear partition 252a and the second rear partition 252b, that is, at a position facing the second battery assembly 200b and the third battery assembly 200c. be done. The third rear recess 256c and the fourth rear recess 256d are similar to the second rear recess 256b. On the other hand, since the first rear recess 256a is arranged at a position facing only the first battery assembly 200a, the distance from the second rear recess 256b to the fourth rear recess 256d is narrower. Such first to fourth rear recesses 256a to 256d are collectively referred to as rear recesses 256. As shown in FIG.

A first rear lead plate 302a is fitted into the first rear recess 256a, and a second rear lead plate 302b is fitted into the second rear recess 256b. A third rear lead plate 302c is fitted into the third rear recess 256c, and a fourth rear lead plate 302d is fitted into the fourth rear recess 256d. The first rear lead plate 302a to the fourth rear lead plate 302d are collectively referred to as the rear lead plate 302, and the rear lead plate 302 has a plate shape. The second rear lead plate 302b is connected to the positive electrodes 212 of the plurality of storage battery cells 210 of the second storage battery assembly 200b and the negative electrodes 214 of the plurality of storage battery cells 210 of the third storage battery assembly 200c. A wiring pattern that electrically connects one positive electrode 212 and one negative electrode 214 is provided on the second rear lead plate 302b. One battery cell 210 of the three battery assembly 200c is connected in series. Here, a through hole is provided in a portion of the second rear lead plate 302b that is connected to the positive electrode 212 . The third rear lead plate 302c and the fourth rear lead plate 302d are similar to the second rear lead plate 302b. On the other hand, the first rear lead plate 302a is connected only to the negative electrodes 214 of the plurality of battery cells 210 of the first battery assembly 200a. Therefore, the first rear lead plate 302a is smaller than the second rear lead plate 302b to the fourth rear lead plate 302d. By such front lead plate 300 and rear lead plate 302, one storage battery cell 210 included in each of the first storage battery assembly 200a to the seventh storage battery assembly 200g is connected in series.

As shown in FIGS. 2 and 3, the control board tray 330 is attached to the upper side of the front case 240 and the rear case 250 that are combined while housing the storage battery assembly 200 . The control board tray 330 is a plate-shaped tray extending in the left-right direction. A control board 332 is arranged on the control board tray 330 . The control board 332 is equipped with an IC (Integrated Circuit) and the like, and controls the operation of the storage battery module 1000 . Like the control board tray 330 , the control board 332 has a plate shape extending in the horizontal direction, but is smaller than the control board tray 330 . A control board lid 334 is attached so as to cover the upper side of the control board tray 330 on which the control board 332 is arranged. The control board lid 334 is a lid for protecting the control board 332 and has a shape matching the control board tray 330 .

As shown in FIG. 5, a left cover 350 is attached to the left side of the front case 240 and the rear case 250 that are assembled while housing the storage battery assembly 200, and a right cover 352 is attached to the right side. The left side lid 350 and the right side lid 352 have plate shapes extending in the vertical direction, and protect the combination of the front side case 240 and the rear side case 250 from the sides. The control board tray 330, the control board lid 334, the left lid 350, and the right lid 352 are made of an insulating material such as resin.

As shown in FIG. 2, the combination of the front case 240 and the rear case 250 to which the control board lid 334, the left side lid 350, and the right side lid 352 are attached from the control board tray 330 is the front housing 110 as described above. and the rear housing 130 . As a result, as shown in FIG. 4, a front space 400 (third front space 400c) surrounded by front surface 112, front lower surface 114, front upper surface 116, and front lead plate 300 (third front lead plate 300c) is formed. be. Here, the third front lead plate 300c corresponds to the surfaces of the fifth battery assembly 200e and the sixth battery assembly 200f on the first electrode side. In the third front space 400c, a portion of the front surface 112 located on the lower surface side than the storage battery cells 210 on the lower surface side end of the fifth battery assembly 200e and the sixth battery assembly 200f, or the front lower surface 114, has a third A front exhaust port 118c is provided. The third front exhaust port 118c is a through hole formed in the front surface 112 portion or the front lower surface 114, and can also be said to be an opening.

A rear space 410 (third rear space 410c) surrounded by the rear surface 132, the rear lower surface 134, the rear upper surface 136, and the rear lead plate 302 (third rear lead plate 302c) is formed. Here, the third rear lead plate 302c corresponds to the surfaces of the fourth battery assembly 200d and the fifth battery assembly 200e on the side of the plurality of second electrodes. In the third rear space 410c, a portion of the rear surface 132 located on the lower surface side of the battery cell 210 at the end of the lower surface of the fourth battery assembly 200d and the fifth battery assembly 200e, or the rear lower surface 134, has a Two rear exhaust ports 138b (FIG. 2) are provided. The second rear exhaust port 138b is a through hole formed in a portion of the rear surface 132 or the rear lower surface 134. As shown in FIG.

The front space 400 and the rear space 410 will be explained in more detail using FIG. divided into Therefore, it can be said that the front partition wall 242 partitions the adjacent front spaces 400 . The first front space 400a to the fourth front space 400d are arranged side by side in the left-right direction. In particular, the first front space 400 a to the third front space 400 c are arranged to face two battery assemblies 200 , but the fourth front space 400 d is arranged to correspond to only one battery assembly 200 . Therefore, the volume of the fourth front space 400d is smaller than the volume of each of the first to third front spaces 400a to 400c. Also, one front exhaust port 118 is provided in the lower portion of each front space 400 . Therefore, one front space 400 has one front exhaust port 118 .

Also, the rear space 410 is divided into a first rear space 410a to a fourth rear space 410d by the first rear partition 252a to the third rear partition 252c. Therefore, it can be said that the rear partition wall 252 partitions the adjacent rear spaces 410 . The first rear space 410a to the fourth rear space 410d are arranged side by side in the horizontal direction. In particular, the second rear space 410 b to the fourth rear space 410 d are arranged to face two battery assemblies 200 , while the first rear space 410 a is arranged to correspond to only one battery assembly 200 . Therefore, the volume of the first rear space 410a is smaller than the volume of each of the second rear space 410b to the fourth rear space 410d. In addition, one rear exhaust port 138 is provided in each lower portion of the second rear space 410b to the fourth rear space 410d.

6(a)-(b) show an overview of gas 500 discharge in the storage battery module 1000. FIG. FIG. 6(a) is a cross-sectional view schematically showing the structure of the storage battery module 1000, and is a cross-sectional view taken in the same direction as in FIG. Here, as an example, the first storage battery cell 210a to the eighth storage battery cell 210h are arranged from bottom to top. As described above, the front space 400 is arranged on the front side of these storage battery cells 210 , and the front exhaust port 118 is provided on the front lower surface 114 in contact with the front space 400 .

When thermal runaway occurs due to an internal short circuit or the like in the third battery cell 210c, the third battery cell 210c releases high-temperature, high-pressure gas 500 from the positive electrode 212 side into the front space 400 via the front case 240 and the front lead plate 300. Gas 500 released into front space 400 contacts front surface 112 . Since the front surface 112 is a metal plate, it absorbs heat from the gas 500 in contact with it and releases the heat to the outside of the storage battery module 1000 . Thus, the gas 500 loses heat and is cooled by contact with the front surface 112 . Also, since the cooled gas 500 is diffused within the front space 400, the pressure of the gas 500 is reduced. Furthermore, the gas 500 whose temperature and pressure have been lowered is discharged to the outside of the storage battery module 1000 from the front side exhaust port 118 provided below the front space 400 .

With such a flow of gas 500, even if sparks are generated when the gas 500 is discharged from the third storage battery cell 210c, the gas is cooled, diffused, and discharged, so high-temperature combustion is less likely to occur. Here, the volume of the fourth front space 400d is smaller than the volume of each of the first to third front spaces 400a to 400c. Therefore, gas 500 released from storage battery cell 210 tends to cause the pressure in fourth front space 400d to be higher than other pressures. As a result, the third front partition wall 242c forming the fourth front space 400d is more likely to be damaged than the other front partition walls 242. As shown in FIG. In this embodiment, the fourth front exhaust port 118d provided in the fourth front space 400d is made larger than the other front exhaust ports 118 in order to prevent damage to the third front partition wall 242c. This suppresses an increase in pressure in the fourth front space 400d. That is, the area of the front exhaust port 118 is increased as the size of the front space 400 is decreased.

If the front exhaust port 118 is provided in the front upper surface 116, air may flow in from the lower part of the front space 400 that is not completely sealed. Since the inflowing air is discharged from the front exhaust port 118, an air flow is generated in the front space 400 from the bottom to the top. Such air flow feeds the spark with air, thereby facilitating high temperature combustion. In the rear space 410 as well, the gas 500 is cooled, diffused, and released in the same manner as in the front space 400 .

FIG. 6(b) is a cross-sectional view schematically showing the structure of a storage battery module 2000 to be compared with the storage battery module 1000 of FIG. 6(a), and is a cross-sectional view in the same direction as that of FIG. Front surface 2112 to front upper surface 2116 , rear surface 2132 to rear upper surface 2136 , storage battery assembly 2200 to negative electrode 2214 , front case 2240 , rear case 2250 , front lead plate 2300 , rear lead plate 2302 , front space 2400 , rear space 2410 . 6(a), from the front surface 112 to the front upper surface 116, from the rear surface 132 to the rear upper surface 136, from the storage battery assembly 200 to the negative electrode 214, the front case 240, the rear case 250, the front lead plate 300, the rear lead plate 302 , the front space 400 and the rear space 410 . Here, a front exhaust port 2118 is provided in a portion of the front surface 2112 in contact with the front space 400 that faces the positive electrode 2212 of the first storage battery cell 2210a.

When thermal runaway occurs due to an internal short circuit or the like in the first storage battery cell 2210a, the first storage battery cell 2210a releases high-temperature, high-pressure gas 2500 from the positive electrode 2212 side into the front space 2400 via the front case 2240 and the front lead plate 2300. Gas 2500 released to front space 2400 is released to the outside of storage battery module 2000 from front side exhaust port 2118 . That is, gas 2500 is not cooled by contact with front surface 2112 . At that time, if a spark is generated, air is supplied to the spark, so high-temperature combustion is likely to occur.

According to this embodiment, one space formed inside the structure 100 has one exhaust port, so that the gas 500 released from the storage battery cell 210 can be released to the outside through the exhaust port. Moreover, since the gas 500 in one space is discharged to the outside from one exhaust port, the gas 500 can be sufficiently discharged. Moreover, since the gas 500 is sufficiently discharged, the occurrence of high-temperature combustion can be suppressed. Moreover, since the gas 500 in one space is discharged to the outside from one exhaust port, it is possible to suppress the inflow of air into the space. Also, since the inflow of air into the space is suppressed, the occurrence of high-temperature combustion can be suppressed.

In addition, since the direction of the positive electrode 212 is common in different aggregates, a plurality of storage battery cells 210 facing in the same direction can be classified into a plurality of aggregates. Also, since the space is divided into the first space and the second space, a small first space and a small second space can be formed when the space is large. Moreover, since one exhaust port is provided for each of the small first space and the second space, the gas 500 can be sufficiently discharged. In addition, since one exhaust port is provided for each of the small first space and the second space, it is possible to suppress the inflow of air into the first space and the second space. Also, since the front surface 112 is a metal plate, the gas 500 can be cooled.

Also, since the orientation of the positive electrode 212 is opposite in different assemblies, multiple assemblies can be formed according to the orientation of the plurality of storage battery cells 210 . Moreover, since the space is divided into the first space and the second space, the first space and the second space can be formed on opposite sides of the storage battery assembly 200 . Moreover, since one exhaust port is provided for each of the first space and the second space, the gas 500 can be sufficiently discharged. Moreover, since one exhaust port is provided for each of the first space and the second space, it is possible to suppress the inflow of air into the first space and the second space. Also, since the front surface 112 and the rear surface 132 are metal plates, the gas 500 can be cooled.

A summary of one aspect of the present disclosure is as follows. A storage battery module 1000 according to an aspect of the present disclosure is a storage battery assembly in which a plurality of storage battery cells 210 having first electrodes and second electrodes facing opposite to each other are arranged with the first electrodes facing in the same direction. 200, a first surface facing the plurality of first electrodes in the storage battery assembly 200, a second surface facing the plurality of second electrodes in the storage battery assembly 200, and the first surface and the second surface The structure 100 includes a third surface and a fourth surface that intersect and face each other with the storage battery assembly 200 interposed therebetween. In the structure 100, a space is formed surrounded by a plurality of first electrode-side surfaces, a first surface, a third surface, and a fourth surface of the storage battery assembly 200. The structure 100 includes: An exhaust port is provided on a portion of the first surface located closer to the third surface than the storage battery cell 210 at the end of the third surface in the storage battery assembly 200, or on the third surface. One space has one exhaust port.

The storage battery assembly 200 includes a first assembly including a plurality of storage battery cells 210 whose first electrodes are positive electrodes 212 and whose second electrodes are negative electrodes 214, and whose first electrodes are positive electrodes 212, and and a second assembly comprising a plurality of battery cells 210 whose second electrodes are negative electrodes 214 .

The space formed in the structure 100 includes a first space surrounded by a plurality of first electrode-side surfaces, a first surface, a third surface, and a fourth surface in the first assembly, and It may include a second space surrounded by a plurality of first electrode-side surfaces, the first surface, the third surface, and the fourth surface. The exhaust port is a portion of the first space located closer to the third surface than the storage battery cell 210 at the end of the third surface in the first assembly, or a first exhaust disposed on the third surface. and the portion of the first surface located closer to the third surface than the storage battery cell 210 at the end of the third surface in the second assembly in the second space, or the second exhaust port arranged on the third surface and may include The storage battery module 1000 further includes a partition separating the first space and the second space.

The first space may have one first exhaust port. The second space has one second exhaust port.

The first surface is a metal plate.

The storage battery assembly 200 includes a first assembly including a plurality of storage battery cells 210 whose first electrodes are positive electrodes 212 and whose second electrodes are negative electrodes 214, and whose first electrodes are negative electrodes 214, and and a second assembly comprising a plurality of battery cells 210 whose second electrodes are positive electrodes 212 .

The structure 100 includes a first space surrounded by a plurality of first electrode-side surfaces, a first surface, a third surface, and a fourth surface in the first assembly, and a plurality of second electrodes in the second assembly. A second space surrounded by the electrode-side surface, the second surface, the third surface, and the fourth surface of the structure 100 is formed, and the structure 100 includes the third surface side end of the first aggregate in the first space. A portion of the first surface located on the third surface side of the storage battery cell 210, or a first exhaust port on the third surface, and the storage battery cell at the end of the third surface in the second assembly in the second space A portion of the second surface located closer to the third surface than 210 or a second exhaust port is provided on the third surface.

The first space may have one first exhaust port. The second space has one second exhaust port.

The first and second surfaces are metal plates.

The exhaust port consists of one opening.

The exhaust port is composed of a plurality of openings.

The present disclosure has been described above based on the embodiments. It should be understood by those skilled in the art that this embodiment is an example, and that various modifications are possible in the combination of each component or each treatment process, and such modifications are within the scope of the present disclosure. .

In this embodiment, a front space 400 and a rear space 410 are formed. However, for example, only one of the front space 400 and the rear space 410 may be formed. According to this modification, when all the storage battery cells 210 are arranged facing the same direction, a space suitable for arrangement can be formed.

In this embodiment, a plurality of front spaces 400 are arranged. However, the number of front spaces 400 is not limited to this, and may be one. According to this modification, the structure can be simplified when the size of the front space 400 is small. The same applies to the rear space 410 as well.

In this embodiment, the front partition wall 242 and the rear partition wall 252 are made of resin or the like. However, not limited to this, for example, the front partition 242 and the rear partition 252 made of resin or the like may be reinforced with a metal plate or the like from the front space 400 or the rear space 410 side. According to this modification, even if the pressure of the generated gas 500 increases, the front partition wall 242 and the rear partition wall 252 are less likely to be damaged.

In this embodiment, the exhaust port consists of one opening. However, the present invention is not limited to this, and for example, the exhaust port may be composed of a plurality of openings. In such a case, the openings are positioned adjacent to each other such that when gas is expelled from one opening, gas does not flow in from the other opening. According to this modified example, the degree of freedom in structure can be improved.

100 structure, 110 front housing, 112 front surface (first surface), 114 front lower surface (third surface), 116 front upper surface (fourth surface), 118 front exhaust port (exhaust port), 130 rear housing, 132 rear surface (second surface) 134 rear lower surface (third surface) 136 rear upper surface (fourth surface) 138 rear exhaust port (exhaust port) 150 left side surface 152 right side surface 200 storage battery assembly (first assembly, second assembly)), 210 storage battery cell, 212 positive electrode (first electrode, second electrode), 214 negative electrode (first electrode, second electrode), 230 battery holder, 240 Front case 242 Front partition 244 Front case plate 246 Front recess 250 Rear case 252 Rear partition 254 Rear case plate 256 Rear recess 300 Front lead plate 302 Rear lead plate 330 control board tray 332 control board 334 control board lid 350 left lid 352 right lid 400 front space 410 rear space 1000 storage battery module.

Claims (4)

a storage battery assembly in which a plurality of storage battery cells having first electrodes and second electrodes facing opposite to each other are arranged with the first electrodes facing in the same direction;
a first surface facing the plurality of first electrodes in the storage battery assembly; a second surface facing the plurality of second electrodes in the storage battery assembly; the first surface and the second surface; a structure that includes a third surface and a fourth surface that face each other across the storage battery assembly while intersecting with the
a space surrounded by a plurality of surfaces on the first electrode side, the first surface, the third surface, and the fourth surface of the storage battery assembly is formed in the structure,
In the space, the structure has a portion of the first surface positioned closer to the third surface than the storage battery cell at the end of the third surface in the storage battery assembly, or an exhaust port on the third surface. with
The storage battery assembly includes a first assembly including a plurality of storage battery cells in which the first electrode is a positive electrode and the second electrode is a negative electrode, and the first electrode is a positive electrode and the a second assembly comprising a plurality of battery cells, the second electrodes of which are negative electrodes;
The space formed in the structure includes a first space surrounded by a plurality of surfaces on the first electrode side of the first assembly, the first surface, the third surface, and the fourth surface; including a second space surrounded by the plurality of first electrode-side surfaces of the second assembly, the first surface, the third surface, and the fourth surface;
The exhaust port is a portion of the first space located closer to the third surface than the storage battery cell at the end of the third surface of the first assembly, or the third surface. a portion of the first surface positioned closer to the third surface than the storage battery cell at the end of the third surface in the second assembly in the second space, Alternatively, including a second exhaust port arranged on the third surface,
This storage battery module is
Further comprising a partition partitioning the first space and the second space,
The first space has one of the first exhaust ports,
The second space has one second exhaust port,
The second space is smaller than the first space,
The second exhaust port is larger than the first exhaust port,
storage battery module. The first surface is a metal plate,
The storage battery module according to claim 1 . a storage battery assembly in which a plurality of storage battery cells having first electrodes and second electrodes facing opposite to each other are arranged with the first electrodes facing in the same direction;
a first surface facing the plurality of first electrodes in the storage battery assembly; a second surface facing the plurality of second electrodes in the storage battery assembly; the first surface and the second surface; a structure that includes a third surface and a fourth surface that face each other across the storage battery assembly while intersecting with the
a space surrounded by a plurality of surfaces on the first electrode side, the first surface, the third surface, and the fourth surface of the storage battery assembly is formed in the structure,
In the space, the structure has a portion of the first surface positioned closer to the third surface than the storage battery cell at the end of the third surface in the storage battery assembly, or an exhaust port on the third surface. with
The storage battery assembly includes a first assembly including a plurality of storage battery cells in which the first electrode is a positive electrode and the second electrode is a negative electrode, and the first electrode is a negative electrode, and the a second assembly comprising a plurality of battery cells, the second electrodes of which are positive electrodes;
The structure includes a first space surrounded by a plurality of surfaces of the first assembly on the side of the first electrode, the first surface, the third surface, and the fourth surface, and the second assembly. forming a second space surrounded by a plurality of the second electrode-side surfaces of the body, the second surface, the third surface, and the fourth surface;
The structure may be a portion of the first space located closer to the third surface than the storage battery cell at the end of the third surface in the first assembly, or the third surface. A portion of the second surface located closer to the third surface than the storage battery cell at the end of the third surface of the second assembly in the second space, or the A second exhaust port is provided on the third surface,
The first space has one of the first exhaust ports,
The second space has one second exhaust port,
The second space is smaller than the first space,
The second exhaust port is larger than the first exhaust port,
storage battery module. The first surface and the second surface are metal plates,
The storage battery module according to claim 3 .

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