JP2022124214A - storage battery module - Google Patents

Abstract

To provide a technique capable of cooling a gas to a level capable of reducing adverse effects on the surroundings and safely discharging the gas while preventing a high-temperature, high-pressure gas ejected from a thermally runaway battery cell from spreading to other battery cells in a battery pack.SOLUTION: A storage battery module includes: a first exhaust path 370 from a first inner exhaust port 336 to a flow direction change position 360 in a space between a first inner case 300a, a second inner case 300b, and an outer case; a second exhaust path 372 from a second inner exhaust port 346 to the flow direction change position 360; and a third exhaust path 374 from the flow direction change position 360 to an outer exhaust port. The flow direction change position 360 has a left side guide 338 and a right side guide 348 formed for directing the gases from the first exhaust path 370 and the gases from the second exhaust path 372 to the third exhaust path 374.SELECTED DRAWING: Figure 2

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.

There is a demand for battery packs with high capacity, high voltage, high output, and high safety. On the other hand, if the battery is placed under abnormal conditions and hot flammable gas blows out from the inside, the housing of the battery pack containing the battery may be damaged, melted, or overheated. Gas may leak out of the battery pack. Furthermore, the heat generated by the combustible gas raises the temperature of adjacent batteries one after another, causing all the batteries inside the battery pack to become abnormal or the housing of the battery pack to melt due to the heat. In order to prevent this, the battery pack is provided with an opening for releasing combustible gas to the outside (see, for example, Patent Document 1).

JP 2009-135088 A

When the battery pack is miniaturized, the distance between the battery that spouts combustible gas and the opening is shortened. As a result, the high-temperature and high-pressure gas may be released outside from the opening of the battery pack without being cooled.

The present disclosure has been made in view of this situation, and aims to prevent the high-temperature, high-pressure gas ejected from a thermally runaway battery cell from spreading to other battery cells in the storage battery pack, and to prevent the spread of fire to the surroundings. To provide a technology for safely releasing a cooling agent to such an extent that adverse effects can be reduced.

In order to solve the above problems, a storage battery module according to an aspect of the present disclosure includes a plurality of storage battery cells, an inner case that houses the plurality of storage battery cells, an outer case that houses the inner case, an inner case and an outer case. and an outer exhaust port connecting the space between and the outside of the outer case. The inner case has a first surface, a second surface, and a third surface facing the outer case, the first surface and the second surface facing in opposite directions, and a third surface between the first surface and the second surface. is arranged, and the inner case has a first inner exhaust port provided on the first surface and a second inner exhaust port provided on the second surface. In the space between the inner case and the outer case, there are a first exhaust path from the first inner exhaust port to the flow direction changing position on the third surface, and a second exhaust path from the second inner exhaust port to the flow direction changing position. 2 exhaust paths and a third exhaust path from the flow path direction changing position to the outer exhaust port are provided, and the gas from the first exhaust path and the gas from the second exhaust path are provided at the flow path direction changing position. A guide portion is provided for directing toward the third exhaust path.

According to the present disclosure, the high-temperature and high-pressure gas ejected from a thermally runaway battery cell is prevented from spreading to other battery cells in the storage battery pack, and it is cooled to the extent that adverse effects on the surroundings can be reduced. can be released to

FIGS. 1(a) to 1(c) are perspective views showing the structure of a storage battery module according to this embodiment. 2(a)-(b) are perspective views showing the structure of the storage battery module of FIGS. 1(a)-(c). FIG. 2 is a perspective view showing an exhaust path in the storage battery module of FIGS. 1(a)-(c); FIG. 2 is a perspective view showing an exhaust path in the storage battery module of FIGS. 1(a)-(c); FIG. 2 is a perspective view showing an exhaust path in the storage battery module of FIGS. 1(a)-(c);

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. When each 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. Also, the gas generation increases the pressure in the storage battery cell, but the gas is released outside the storage battery cell from the positive electrode or from both the positive and negative electrodes due to the safety mechanism. Such gas is of high temperature and high pressure, and if combustion occurs due to the gas, there is a risk of thermal runaway (fire spreading) in other storage battery cells in the storage battery module. 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, it is effective, for example, to provide an exhaust port in the storage battery module and release the gas from the exhaust port to the outside of the storage battery module. However, when the storage battery module is miniaturized, the distance between each storage battery cell and the exhaust port is shortened. As a result, the high-temperature and high-pressure gas is discharged from the exhaust port as it is without being cooled, creating a dangerous situation around the storage battery module.

In the storage battery module according to this embodiment, a plurality of storage battery cells are housed in the inner case, and the inner case is housed in the outer case. The inner case is provided with an inner exhaust port, and the outer case is provided with an outer exhaust port. Further, an exhaust path through which high-temperature and high-pressure gas passes and a radiator plate in contact with the exhaust path are provided between the inner case and the outer case. With such a structure, the high-temperature and high-pressure gas ejected from the storage battery cells moves inside the inner case and is discharged outside the inner case from the inner exhaust port. Further, the high-temperature, high-pressure gas discharged outside the inner case is discharged outside the outer case from the outer exhaust port through the exhaust path. As a result, the path through which the high-temperature, high-pressure gas passes in the storage battery module becomes longer, and the contact area between the outer case, the inner case, the radiator plate, and the high-temperature, high-pressure gas increases. This cools the high-temperature, high-pressure gas within the storage battery module. Furthermore, in this embodiment, by providing the guide portion in the exhaust path, the high-temperature and high-pressure gas can be easily directed from the inner exhaust port to the outer exhaust port. 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.

1(a)-(c) are perspective views showing the structure of the storage battery module 1000. FIG. As shown in FIGS. 1(a)-(c), 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 . In addition, the positive directions of the x-axis, y-axis, and z-axis are defined in the directions of the arrows in FIGS. . 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".

FIG. 1(a) shows the appearance of a storage battery module 1000. FIG. The storage battery module 1000 includes a first outer case 100a and a second outer case 100b. The first outer case 100a includes a front front plate 110, a left front left plate 112, a right front right plate 114, and an upper front top plate 116. The second outer case 100b includes a rear rear plate 120, It includes a left rear left plate 122 , a right rear right plate 124 and a rear top plate 126 . The first outer case 100a and the second outer case 100b are made of resin, for example. The rear end of the front left plate 112 and the front end of the rear left plate 122 are connected, the rear end of the front right plate 114 is connected to the front end of the rear right plate 124, and the rear end of the front upper plate 116 is connected. By connecting the side ends and the front end of the rear upper plate 126, the first outer case 100a and the second outer case 100b are combined. The first outer case 100a and the second outer case 100b in a combined state have a box shape elongated in the vertical direction, and are also called an outer case 100. As shown in FIG.

The opening of the front plate 110 and the opening of the front upper plate 116 are connected as through holes, and the upper front portion of the first outer case 100a forming the through holes is the handle 130 . In order to increase the strength of the handle 130, a frame-shaped handle cover 132 is attached inside the through-hole. The user lifts the storage battery module 1000 by inserting his/her hand into the through-hole from the opening of the front upper plate 116 and gripping the handle 130 . A display unit 140 for displaying the states of a plurality of storage battery cells (not shown) housed inside the outer case 100 is arranged on the front upper plate 116 of the first outer case 100a. The display unit 140 includes, for example, an LED (Light Emitting Diode). On the other hand, the second outer case 100b does not have the display section 140. As shown in FIG.

FIG. 1(b) shows a structure in which the first outer case 100a and the second outer case 100b are removed from FIG. 1(a). A synthetic resin bag 200 is accommodated in the outer case 100 . The synthetic resin bag 200 is a bag made from a synthetic resin such as polyethylene or polypropylene. A synthetic resin bag 200 covers an inner case, which will be described later. A synthetic resin bag 200 covering the inner case is accommodated in the first outer case 100a. The opening of the first outer case 100a containing the synthetic resin bag 200 is covered with the second outer case 100b. That is, the first outer case 100a houses the inner case, and the second outer case 100b covers the opening of the first outer case 100a, so that the outer case 100 houses the inner case 300. As shown in FIG. In addition, a terminal assembly 250 and one or more terminals 252 are arranged below the synthetic resin bag 200 . A hole is formed in the mounting position of the terminal 252 in the outer case 100, and since the terminal portion is mounted in the hole, the gap between the hole and the terminal 252 serves as an outer exhaust port, which will be described later. The terminal assembly 250 and terminals 252 will be described later.

FIG. 1(c) shows a structure in which the synthetic resin bag 200 is removed from FIG. 1(b). As described above, inner case 300 covered with synthetic resin bag 200 is a combination of first inner case 300 a and second inner case 300 b and accommodates battery holder 400 . The radiator plate 310 covers the inner case 300 housing the battery holder 400 from the front side. A terminal assembly 250 shown in FIG. 1B is connected to the lower side of the battery holder 400, and one or more terminals 252 are connected to the terminal assembly 250. The terminal 252 is, for example, a USB (Universal Serial Bus) (registered trademark) port to which a USB (registered trademark) connector can be connected. Storage battery cells 410 supply power to devices (not shown) connected via terminals 252 .

2(a) and 2(b) are perspective views showing the structure of the storage battery module 1000. FIG. FIG. 2(a) shows the structure with the radiator plate 310 removed from FIG. 1(c), and FIG. 2(b) shows the structure with the first inner case 300a and the second inner case 300b removed from FIG. 2(a). Show structure. The battery holder 400 has a box shape elongated in the vertical direction, the left zx plane is the battery holder first surface 402 , and the right zx plane is the battery holder second surface 404 . Battery holder 400 accommodates a plurality of storage battery cells 410 therein.

The storage battery cell 410 is, for example, a cylindrical lithium ion secondary battery. A positive electrode (not shown) and a negative electrode (not shown) facing each other are arranged at both ends of the cylindrical shape of the storage battery cell 410 . A known technique may be used for the storage battery cell 410, and a safety mechanism is provided to release high-temperature, high-pressure gas to the outside when the internal pressure rises due to the occurrence of an internal short circuit or the like. Some of the plurality of storage battery cells 410 are arranged in the battery holder 400 with the positive electrodes facing the battery holder first surface 402 side, and the rest of the plurality of storage battery cells 410 are arranged in the battery holder 400 with the positive electrodes facing the battery holder second surface. It is arranged toward the surface 404 side. For example, the number of storage battery cells 410 arranged like the former is the same as the number of storage battery cells 410 arranged like the latter. Battery holder 400 is made of an insulating material such as resin.

The first inner case 300 a includes a first surface 330 , a left third surface 332 and a left protective wall 334 . The first surface 330 has a plate shape extending in the zx plane, and the left third surface 332 has a plate shape extending in the yz plane. Also, the left third surface 332 is arranged to extend rightward from the front end of the first surface 330 . Further, a left protective wall 334 is arranged to extend rightward from the upper end of the first surface 330 . The left protection wall 334 is shorter than the left third surface 332 in the left-right direction.

The second inner case 300 b includes a second surface 340 , a right third surface 342 and a right protective wall 344 . The second surface 340 has a plate shape extending in the zx plane, and the right third surface 342 has a plate shape extending in the yz plane. The right third surface 342 is arranged to extend leftward from the front end of the second surface 340 . Further, a right protective wall 344 is arranged to extend leftward from the upper end of the second surface 340 . The right protection wall 344 is shorter than the right third surface 342 in the left-right direction.

Here, the first surface 330 of the first inner case 300 a faces the battery holder first surface 402 of the battery holder 400 , and the second surface 340 of the second inner case 300 b faces the battery holder second surface 404 of the battery holder 400 . is made to face. From this state, the left third surface 332 and the right third surface 342 are connected so that the right end of the left third surface 332 and the left end of the right third surface 342 are in contact with each other. As a result, the left third surface 332 and the right third surface 342 form one surface, which is called the "third surface". That is, the inner case 300 has a first surface 330, a second surface 340, and a third surface, the first surface 330 and the second surface 340 are opposite to each other, and the space between the first surface 330 and the second surface 340 is , the third surface is arranged on the . Also, the inner case 300 houses the battery holder 400 from three sides by the first surface 330, the second surface 340, and the third surface.

The heat sink 310 includes a front heat sink 320 , a left heat sink 322 , and a right heat sink 324 . The heat sink front plate 320 has a rectangular plate shape extending in the yz plane. The heat sink left plate 322 has a plate shape extending in the zx plane, and is arranged rearward from the left end of the heat sink front plate 320 . The heat sink right plate 324 has a plate shape extending in the zx plane, and is arranged rearward from the right end of the heat sink front plate 320 . A radiator plate 310 is attached from the front side to the first inner case 300a and the second inner case 300b housing the battery holder 400 . At this time, the left plate 322 of the heat sink faces the first surface 330, the right plate 324 of the heat sink faces the second surface 340, and the front plate 320 of the heat sink faces the third surface. The first inner case 300a, the second inner case 300b, and the radiator plate 310 are made of metal, for example.

Here, the space formed between the inner case 300 and the radiator plate 310 will be described. A second inner exhaust port 346 is provided on the second surface 340 of the second inner case 300b. Since the second inner exhaust port 346 penetrates the second inner case 300b, the space between the battery holder second surface 404 and the second inner case 300b and the space between the inner case 300 and the heat sink 310 are separated. Connecting. A route from the second inner exhaust port 346 upward along the second surface 340, bends toward the third surface, and heads toward the flow direction changing position 360 arranged in the center portion of the third surface in the left-right direction. is the second exhaust path 372 .

A first inner exhaust port 336 is provided on the first surface 330 of the first inner case 300a. Since the first inner exhaust port 336 penetrates the first inner case 300a, the space between the battery holder first surface 402 and the first inner case 300a and the space between the inner case 300 and the heat sink 310 are separated. Connecting. A first exhaust path 370 is a path that extends from the first inner exhaust port 336 upward along the first surface 330 , turns toward the third surface, and heads toward the flow path direction changing position 360 .

Further, the path from the flow path direction changing position 360 to the exhaust position 362 downward is the third exhaust path 374 . Exhaust location 362 leads to terminal 252 previously described. Although the details will be described later, since the terminal 252 is also called an outer exhaust port, it can be said that the third exhaust path 374 extends from the flow path direction changing position 360 to the outer exhaust port.

At the flow path direction changing position 360 , the left third surface 332 is provided with the left guide portion 338 , and the right third surface 342 is provided with the right guide portion 348 . The combination of the left guide portion 338 and the right guide portion 348 is also called a "guide portion" and protrudes downward. The guide portion corresponds to a part of the wall provided to surround the first exhaust path 370, the second exhaust path 372, and the third exhaust path 374 on the first surface 330, the second surface 340, and the third surface. do.

The left protective wall 334 covers the space between the battery holder first surface 402 and the first inner case 300a from above. The right protective wall 344 covers the space between the battery holder second surface 404 and the second inner case 300b from above. Since the plurality of storage battery cells 410 are arranged sideways in the battery holder 400 , it can be said that the left protective wall 334 and the right protective wall 344 cover at least part of the side surfaces of the plurality of storage battery cells 410 .

The combination of the inner case 300, the radiator plate 310, and the battery holder 400 shown in FIG. 1(c) is covered with the synthetic resin bag 200 as shown in FIG. 1(b). It can be said that the inside of the outer case 100 is covered with the synthetic resin bag 200 . Also, since the synthetic resin bag 200 is stored in the outer case 100 , the first surface 330 , the second surface 340 , and the third surface can be said to face the outer case 100 via the radiator plate 310 . Further, it can be said that the outer exhaust port, which is the terminal 252 , connects the space between the inner case 300 and the outer case 100 and the outside of the outer case 100 .

Below, when one of the storage battery cells 410 undergoes thermal runaway, the path through which the high-temperature, high-pressure gas ejected from the storage battery cell 410 is exhausted from the storage battery module 1000 will be described. FIG. 3 is a perspective view showing an exhaust route in the storage battery module 1000. FIG. Here, the left side of the storage battery module 1000 is shown facing up. Also, in order to explain the inside of the storage battery module 1000, the front left plate 112, the rear left plate 122, the synthetic resin bag 200, the left heat sink plate 322, and the first surface 330 are omitted. As described above, in the battery holder 400, some of the plurality of storage battery cells 410 are arranged with the positive electrodes facing the battery holder first surface 402 side, and the rest of the plurality of storage battery cells 410 are arranged with the negative electrodes facing the battery holder first surface 402 side. placed towards.

When the storage battery cell 410 undergoes thermal runaway, the storage battery cell 410 spouts high-temperature and high-pressure gas from at least one of the positive electrode and the negative electrode, and depending on the case, from both ends. As a result, for example, the space between the battery holder first surface 402 and the first surface 330 (FIG. 2(b)) and the space between the battery holder second surface 404 and the second surface 340 (FIG. 2(b)) A high temperature and high pressure gas is jetted into the space between them. Since the space between the battery holder first surface 402 and the first surface 330 opens at the first inner exhaust port 336 ( FIG. 2( a )), the high-temperature and high-pressure gas contacts the first surface 330 and flows through the first surface 330 . Head to inner exhaust port 336 . At that time, the temperature of the high-temperature, high-pressure gas is reduced by contacting the first surface 330 . Here, the path from storage battery cell 410 to first inner exhaust port 336 is inner exhaust path 420 . The same applies to the high-temperature and high-pressure gas jetted into the space between the battery holder second surface 404 and the second surface 340, so the description is omitted here.

FIG. 4 is a perspective view showing an exhaust route in the storage battery module 1000. FIG. This is shown in the same orientation as in FIG. Also, in order to explain the inside of the storage battery module 1000, the front left panel 112, the rear left panel 122, and the synthetic resin bag 200 are omitted. Although the left heat sink plate 322 is also omitted in the drawing, the left heat sink plate 322 is actually arranged on the upper surface in FIG. The high-temperature, high-pressure gas is discharged from the first inner exhaust port 336 into the space between the first surface 330 and the first outer plate 110a (FIG. 2(b)), and flows between the first surface 330 and the first outer plate 110a. , while moving toward the first waypoint 350 . Since the heat sink left plate 322 is provided between the first surface 330 and the first outer plate 110 a , it can be said that the high-temperature high-pressure gas is directed toward the first intermediate position 350 while also contacting the heat sink left plate 322 . As a result, the temperature of the high-temperature, high-pressure gas is reduced. The first intermediate position 350 is a portion connecting the first surface 330 to the third surface. Here, the route from the first inner exhaust port 336 to the first intermediate position 350 is included in the first exhaust route 370 described above.

FIG. 5 is a perspective view showing an exhaust path in the storage battery module 1000. FIG. Here, the battery module 1000 is shown with the front side up. Also, in order to explain the inside of the storage battery module 1000, the front plate 110 and the synthetic resin bag 200 are omitted. Although the heat sink 310 is also omitted in the drawing, a heat sink front plate 320 is actually arranged on the upper surface in FIG. The high-temperature, high-pressure gas traveling along the first exhaust path 370 moves from the first transit position 350 to the third surface toward the flow direction changing position 360 . On the other hand, the high-temperature and high-pressure gas ejected into the space between the battery holder second surface 404 and the second surface 340 described above passes through the second inner exhaust port 346 and the second surface 340 to reach the second via position 352 . , to the third plane and toward the flow direction changing position 360 . The second intermediate position 352 is a portion connecting the second surface 340 to the third surface.

As described above, the guide portion formed by the combination of the left guide portion 338 and the right guide portion 348 protrudes downward at the flow path direction changing position 360, so that the first exhaust path 370 and the second exhaust path Hot, high pressure gas traveling along 372 is bent downward in the vicinity of the flow redirecting location 360 . The high-temperature, high-pressure gas that has reached the flow direction changing position 360 advances to the exhaust position 362 along the third exhaust path 374 . At this time, the high-temperature, high-pressure gas comes into contact with the third surface and the front plate 320 of the radiator plate, so that the temperature is reduced.

If a guide portion is not provided at the flow path direction changing position 360, the high temperature and high pressure gas entering the third surface from the first intermediate position 350 is less likely to bend downward in the vicinity of the flow path direction changing position 360 and travels straight. while moving toward the second waypoint 352 . This makes it difficult for the high temperature, high pressure gas to go to the exhaust position 362 . As a result, the temperature of the space between the third surface and the heat sink front plate 320 rises. The same is true for the high-temperature, high-pressure gas that enters the third surface from the second via position 352 . That is, the guide portion is provided to guide the high-temperature, high-pressure gas from the first exhaust path 370 and the high-temperature, high-pressure gas from the second exhaust path 372 toward the third exhaust path 374 . The gas (high-temperature, high-pressure gas) breaks the synthetic resin bag 200 from the exhaust position 362, passes through the terminal assembly 250, and is discharged from the terminal 252 to the outside. Therefore, as described above, the terminal 252 can also be said to be an outer exhaust port.

According to this embodiment, the high-temperature, high-pressure gas ejected from the storage battery cell 410 is discharged from the terminal 252 through the first exhaust path 370 and the third exhaust path 374. can be lengthened. The high-temperature, high-pressure gas that has passed through the second exhaust path 372 is similarly discharged from the terminal 252 through the third exhaust path 374 . In addition, since the path through which the high-temperature and high-pressure gas passes in the storage battery module 1000 can be lengthened, the cooling effect of the high-temperature and high-pressure gas is enhanced, and the high-temperature and high-pressure gas can be sufficiently cooled. In addition, since the high-temperature and high-pressure gas is sufficiently cooled, it is possible to prevent the high-temperature and high-pressure gas ejected from the thermally runaway battery from being released to the outside in a high temperature state, thereby reducing the thermal effect on the surroundings of the storage battery module 1000. can be done. Further, at the flow path direction changing position 360, a guide portion is provided for directing the high-temperature, high-pressure gas from the first exhaust path 370 and the high-temperature, high-pressure gas from the second exhaust path 372 toward the third exhaust path 374. High pressure gas can be efficiently directed to the third exhaust path 374 .

Moreover, since the plurality of storage battery cells 410 are covered with the synthetic resin bag 200 inside the outer case 100, the waterproof performance of the storage battery module 1000 can be improved. In addition, inside the outer case 100, the plurality of storage battery cells 410 are covered with a synthetic resin bag 200, and the high temperature and high pressure gas emitted from the exhaust position 362 melts a part of the synthetic resin bag 200 and creates a hole. is opened and can be released to the outside mainly through the through hole. In addition, most of the high-temperature and high-pressure gas ejected from the storage battery cell 410 can be released to the outside through the through-holes in the synthetic resin bag 200, thereby suppressing an increase in the amount of air supplied to the storage battery cell 410 that ejects the high-temperature and high-pressure gas. can. Since an increase in the amount of air supplied to storage battery cells 410 that eject high-temperature, high-pressure gas is suppressed, the occurrence of ignition can be suppressed.

In addition, since the left protective wall 334 and the right protective wall 344 are provided, it is possible to suppress an increase in the amount of air supplied to the storage battery cell 410 that spouts high-temperature, high-pressure gas. In addition, since the first outer case 100a accommodates the inner case 300 and the second outer case 100b does not accommodate the inner case 300, the structure can be simplified. In addition, since the first outer case 100a has the display portion 140 and the second outer case 100b does not have the display portion 140, the structure can be simplified.

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 includes a plurality of storage battery cells (410), an inner case (300) that houses the plurality of storage battery cells (410), and an outer case (300) that houses the inner case (300). 100), and an outer exhaust port (252) connecting the space between the inner case (300) and the outer case (100) and the outside of the outer case (100). The inner case (300) has a first side (330), a second side (340) and a third side facing the outer case (100), the first side (330) and the second side (340) A third surface is arranged between the first surface (330) and the second surface (340) facing oppositely, and the inner case (300) is provided with a first inner exhaust port ( 336) and a second inner exhaust port (346) provided in the second surface (340). In the space between the inner case (300) and the outer case (100), there is a first exhaust from the first inner exhaust port (336) to the flow direction changing position (360) on the third surfaces (332, 342). A path (370) and a second exhaust path (372) from a second inner outlet (346) to a flow redirecting location (360) and from a flow redirecting location (360) to an outer exhaust (252). is provided, and the gas from the first exhaust path (370) or the gas from the second exhaust path (372) is transferred to the third exhaust path (374) at the flow path direction changing position (360). Guides (338, 348) are provided for directing.

A plurality of storage battery cells (410) are covered with a synthetic resin bag (200) inside the outer case (100).

The inner case (300) may further include protective walls (334, 344) that cover at least part of the side surfaces of the plurality of storage battery cells (410).

The outer case (100) may include a first outer case (100a) and a second outer case (100b). The first outer case (100a) accommodates the inner case (300), and the second outer case (100b) covers the opening of the first outer case (100a).

The first outer case (100a) may have a display (140) for displaying the status of the plurality of battery cells (410). The second outer case (100b) does not have a display (140).

Some of the plurality of storage battery cells (410) are arranged in the inner case (300) with the positive electrodes facing the first surface (330), and the rest of the plurality of storage battery cells (410) are arranged in the inner case (300). Inside, the positive electrode is arranged facing the second surface (340).

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. .

100 outer case 110 front plate 112 front left plate 114 front right plate 116 front upper plate 120 rear plate 122 rear left plate 124 rear right plate 126 rear upper plate 130 handle 132 handle Cover 140 Display 200 Synthetic resin bag 250 Terminal assembly 252 Terminal (outer exhaust port) 300 Inner case 310 Radiator plate 320 Radiator front plate 322 Radiator left plate 324 Radiator right plate 330 First surface 332 Left third surface 334 Left protective wall (protective wall) 336 First inner exhaust port 338 Left guide part (guide part) 340 Second surface 342 Right third surface 344 Right protective wall (protective wall), 346 second inner exhaust port, 348 right guide portion (guide portion), 350 first transit position, 352 second transit position, 360 flow path direction changing position, 362 exhaust position, 370 first exhaust path, 372 second exhaust path, 374 third exhaust path, 400 battery holder, 402 battery holder first surface, 404 battery holder second surface, 410 battery cell, 420 inner exhaust path, 1000 battery module.

Claims (6)

a plurality of battery cells;
an inner case that houses the plurality of storage battery cells;
an outer case that houses the inner case;
A space between the inner case and the outer case, and an outer exhaust port connecting the outer case to the outside,
The inner case has a first surface, a second surface, and a third surface facing the outer case, the first surface and the second surface facing in opposite directions, and the first surface and the second surface. The third surface is arranged between
The inner case has a first inner exhaust port provided on the first surface and a second inner exhaust port provided on the second surface,
In the space between the inner case and the outer case, there are provided a first exhaust path from the first inner exhaust port to a flow path direction changing position on the third surface, and a flow path from the second inner exhaust port. A second exhaust path to a direction change position and a third exhaust path from the flow path direction change position to the outer exhaust port are provided,
A guide portion is provided at the flow path direction changing position for directing the gas from the first exhaust path and the gas from the second exhaust path toward the third exhaust path,
storage battery module. The plurality of storage battery cells are covered with a synthetic resin bag inside the outer case,
The storage battery module according to claim 1. The storage battery module according to claim 1 or 2, wherein the inner case further includes a protective wall that covers at least part of the side surfaces of the plurality of storage battery cells. The outer case includes a first outer case and a second outer case,
The first outer case accommodates the inner case,
The second outer case covers the opening of the first outer case,
The storage battery module according to any one of claims 1 to 3. The first outer case has a display for displaying the states of the plurality of storage battery cells,
The second outer case does not have the display unit,
The storage battery module according to claim 4. Some of the plurality of storage battery cells are arranged in the inner case with the positive electrode facing the first surface,
The storage battery module according to any one of claims 1 to 5, wherein the rest of the plurality of storage battery cells are arranged in the inner case with positive electrodes facing the second surface.

Images