Battery Module

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]

[0001] The present disclosure relates to battery modules, and more particularly to battery modules housing a plurality of battery cells. [Background technology]

[0002] There is a demand for a battery pack that has a high capacity, a high voltage, a high output, and is also highly safe. On the other hand, if a battery is placed under abnormal conditions and high-temperature flammable gas is released from inside, the housing of the battery pack housing the battery may be damaged, melted, or overheated, or the released flammable gas may leak outside the battery pack. Furthermore, the heat generated by the flammable gas may cause adjacent batteries to become hot 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. To prevent this, an opening is provided in the battery pack to release the flammable gas to the outside (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] JP 2009-135088 A Summary of the Invention [Problem to be solved by the invention]

[0004] When a battery pack is made smaller, the distance between the battery that emits the flammable gas and the opening becomes shorter, which may result in high-temperature, high-pressure gas being released to the outside through the opening of the battery pack without being cooled.

[0005] The present disclosure has been made in consideration of these circumstances, and its purpose is to provide technology that prevents high-temperature, high-pressure gas emitted from a thermal runaway battery cell from spreading to other battery cells in a storage battery pack and that cools the gas to a level that reduces adverse effects on the surrounding area and then safely releases it. [Means for solving the problem]

[0006] In order to solve the above problem, a storage battery module according to an embodiment 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, a space between the inner case and the outer case, and an outer exhaust port that connects the outer case to the outside. The inner case has a first surface, a second surface, and a third surface that face the outer case, the first surface and the second surface facing opposite each other, and the third surface is disposed between the first surface and the second surface, 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, a first exhaust path from the first inner exhaust port to a flow path direction changing position on the third surface, a second exhaust path from the second inner exhaust port to the flow path direction changing position, and a third exhaust path from the flow path direction changing position to the outer exhaust port are provided, and a guide portion is provided at the flow path direction changing position to direct gas from the first exhaust path and gas from the second exhaust path to the third exhaust path. Effect of the Invention

[0007] According to the present disclosure, it is possible to prevent high-temperature, high-pressure gas emitted from a thermal runaway battery cell from spreading to other battery cells in the battery pack and to cool the gas to a level that reduces adverse effects on the surrounding area before safely releasing it. [Brief description of the drawings]

[0008] [Figure 1] 1(a) to 1(c) are perspective views showing the structure of a storage battery module according to this embodiment. [Diagram 2] 2(a)-(b) are perspective views showing the structure of the storage battery module of FIGS. 1(a)-(c). [Diagram 3] FIG. 2 is a perspective view showing an exhaust path in the storage battery module of FIGS. [Figure 4] FIG. 2 is a perspective view showing an exhaust path in the storage battery module of FIGS. [Diagram 5]FIG. 2 is a perspective view showing an exhaust path in the storage battery module of FIGS. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] Before specifically describing the embodiment of the present disclosure, an overview of the embodiment 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. In addition, the generation of gas increases the pressure in the storage battery cell, but the gas is discharged from the positive electrode or both the positive and negative electrodes to the outside of the storage battery cell by a safety mechanism. Such gas is high temperature and high pressure, and when combustion occurs due to the gas, other storage battery cells in the storage battery module may also thermally run away (spread fire). This spread of fire may cause the entire storage battery module or the entire product to burn. In order to suppress the spread of fire due to gas, for example, it is effective to provide an exhaust port in the storage battery module and discharge 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 becomes shorter. As a result, the high temperature and high pressure gas is discharged from the exhaust port as it is without being cooled, and a dangerous state occurs around the storage battery module.

[0010] In the storage battery module according to the present embodiment, a plurality of storage battery cells are housed in an inner case, and the inner case is housed in an outer case. An inner exhaust port is provided in the inner case, and an outer exhaust port is provided in the outer case. In addition, an exhaust path through which high-temperature, high-pressure gas passes and a heat sink that contacts the exhaust path are provided between the inner case and the outer case. With this structure, high-temperature, high-pressure gas ejected from the storage battery cells moves inside the inner case and is discharged to the outside of the inner case from the inner exhaust port. In addition, the high-temperature, high-pressure gas discharged to the outside of the inner case passes through the exhaust path and is discharged to the outside of the outer case from the outer exhaust port. 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, and the heat sink and the high-temperature, high-pressure gas becomes larger. This allows the high-temperature, high-pressure gas to be cooled in the storage battery module. Furthermore, in this embodiment, a guide portion is provided in the exhaust path to facilitate the high-temperature, high-pressure gas to be directed from the inner exhaust port to the outer exhaust port. In the following description, "parallel" and "perpendicular" include not only perfect parallel and perpendicular, but also deviations from parallel and perpendicular within a margin of error. Additionally, "approximately" means that it is roughly the same.

[0011] 1(a)-(c) are perspective views showing the structure of a storage battery module 1000. As shown in FIG. 1(a)-(c), an orthogonal coordinate system including an x-axis, a y-axis, and a z-axis is defined. The x-axis and the y-axis are mutually orthogonal 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. The positive directions of the x-axis, the y-axis, and the z-axis are defined as the directions of the arrows in FIG. 1(a)-(c), and the negative directions are defined as the directions opposite to the arrows. The positive side of the x-axis is sometimes called the "front side" or "front side", the negative side of the x-axis is sometimes called the "rear side" or "rear side", the positive side of the z-axis is sometimes called the "upper side" or "top side", and the negative side of the z-axis is sometimes called the "lower side" or "bottom side". Furthermore, the positive side along the y-axis is sometimes called the "right side," and the negative side along the y-axis is sometimes called the "left side."

[0012] 1(a) shows the external appearance of the storage battery module 1000. 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 plate 110 on the front side, a front left plate 112 on the left side, a front right plate 114 on the right side, and a front upper plate 116 on the upper side, and the second outer case 100b includes a rear plate 120 on the rear side, a rear left plate 122 on the left side, a rear right plate 124 on the right side, and a rear upper plate 126. The first outer case 100a and the second outer case 100b are formed of, for example, resin. The first outer case 100a and the second outer case 100b are combined by connecting the rear end of the front left plate 112 to the front end of the rear left plate 122, connecting the rear end of the front right plate 114 to the front end of the rear right plate 124, and connecting the rear end of the front upper plate 116 to the front end of the rear upper plate 126. The first outer case 100a and the second outer case 100b in the combined state have a box shape that is long in the vertical direction, and are also referred to as the outer case 100.

[0013] The opening of the front plate 110 and the opening of the front upper plate 116 are connected as a through hole, and the front upper part of the first outer case 100a forming the through hole 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. A user inserts his / her hand into the through hole from the opening of the front upper plate 116 and holds the handle 130 to lift the storage battery module 1000. A display unit 140 for displaying the state of a plurality of storage battery cells (not shown) housed inside the outer case 100 is disposed 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 unit 140.

[0014] FIG. 1(b) shows the structure of FIG. 1(a) with the first outer case 100a and the second outer case 100b removed. The outer case 100 houses a synthetic resin bag 200. The synthetic resin bag 200 is a bag made of synthetic resin such as polyethylene and polypropylene as a raw material. The synthetic resin bag 200 covers the inner case described below. The synthetic resin bag 200 covering the inner case is housed in the first outer case 100a. The opening of the first outer case 100a in which the synthetic resin bag 200 is housed is covered by the second outer case 100b. In other words, 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. In addition, a terminal assembly 250 and one or more terminals 252 are arranged at the bottom of the synthetic resin bag 200. A hole is formed in the outer case 100 at the mounting position of the terminal 252, and the terminal portion is attached to the hole, so that 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 the terminal 252 will be described later.

[0015] FIG. 1(c) shows the structure of FIG. 1(b) with the synthetic resin bag 200 removed. As described above, the inner case 300 covered by the synthetic resin bag 200 is a combination of a first inner case 300a and a second inner case 300b, and houses the battery holder 400. A heat sink 310 covers the front side of the inner case 300 housing the battery holder 400. The terminal assembly 250 of FIG. 1(b) is connected to the underside 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 Universal Serial Bus (USB) (registered trademark) port, and a USB (registered trademark) connector can be connected. The storage battery cell 410 supplies power to a connected device (not shown) via the terminal 252.

[0016] 2(a)-(b) are perspective views showing the structure of the storage battery module 1000. Fig. 2(a) shows the structure of Fig. 1(c) with the heat sink 310 removed, and Fig. 2(b) shows the structure of Fig. 2(a) with the first inner case 300a and the second inner case 300b removed. The battery holder 400 has a box shape that is long in the vertical direction, with the zx plane on the left side being the battery holder first surface 402 and the zx plane on the right side being the battery holder second surface 404. The battery holder 400 houses multiple storage battery cells 410 inside.

[0017] 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 opposite to each other are arranged on both ends of the cylindrical shape of the storage battery cell 410. The storage battery cell 410 may be made using a known technology, and is provided with a safety mechanism that releases high-temperature, high-pressure gas to the outside when the internal pressure increases due to the occurrence of an internal short circuit or the like. Some of the multiple storage battery cells 410 are arranged in the battery holder 400 with their positive electrodes facing the battery holder first surface 402 side, and the remaining multiple storage battery cells 410 are arranged in the battery holder 400 with their positive electrodes facing the battery holder second surface 404 side. For example, the number of storage battery cells 410 arranged in the former manner is the same as the number of storage battery cells 410 arranged in the latter manner. The battery holder 400 is formed of an insulating material, for example, a resin.

[0018] The first inner case 300a 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. The left third surface 332 is disposed so as to extend from the front end of the first surface 330 to the right. The left protective wall 334 is disposed so as to extend from the upper end of the first surface 330 to the right. The left protective wall 334 is shorter than the left third surface 332 in the left-right direction.

[0019] The second inner case 300b 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 disposed so as to extend leftward from the front end of the second surface 340. Furthermore, the right protective wall 344 is disposed so as to extend leftward from the upper end of the second surface 340. The right protective wall 344 is shorter than the right third surface 342 in the left-right direction.

[0020] Here, the first surface 330 of the first inner case 300a is opposed to the battery holder first surface 402 of the battery holder 400, and the second surface 340 of the second inner case 300b is opposed to the battery holder second surface 404 of the battery holder 400. 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, and this surface is called the "third surface." In other words, the inner case 300 has the first surface 330, the second surface 340, and the third surface, and the first surface 330 and the second surface 340 face in opposite directions, and the third surface is disposed between the first surface 330 and the second surface 340. Additionally, inner case 300 houses battery holder 400 from three sides, via first surface 330, second surface 340, and third surface.

[0021] The heat sink 310 includes a heat sink front plate 320, a heat sink left plate 322, and a heat sink right plate 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 disposed from the left end of the heat sink front plate 320 toward the rear. The heat sink right plate 324 has a plate shape extending in the zx plane, and is disposed from the right end of the heat sink front plate 320 toward the rear. The heat sink 310 is attached from the front side to the first inner case 300a and the second inner case 300b that house the battery holder 400. At this time, the heat sink left plate 322 and the first surface 330 face each other, the heat sink right plate 324 and the second surface 340 face each other, and the heat sink front plate 320 and the third surface face each other. The first inner case 300a, the second inner case 300b and the heat sink 310 are made of, for example, metal.

[0022] Here, the space formed between the inner case 300 and the heat sink 310 will be described. A second inner exhaust port 346 is provided on the second surface 340 of the second inner case 300b. The second inner exhaust port 346 penetrates the second inner case 300b, and connects the space between the battery holder second surface 404 and the second inner case 300b to the space between the inner case 300 and the heat sink 310. The second exhaust path 372 is a path that runs from the second inner exhaust port 346 upward along the second surface 340, then bends toward the third surface, and heads toward the flow path direction changing position 360 located in the center of the third surface in the left-right direction.

[0023] A first inner exhaust port 336 is provided on the first surface 330 of the first inner case 300a. The first inner exhaust port 336 penetrates the first inner case 300a, connecting the space between the battery holder first surface 402 and the first inner case 300a to the space between the inner case 300 and the heat sink 310. The path that runs from the first inner exhaust port 336 upward along the first surface 330, then bends toward the third surface and heads toward the flow path direction changing position 360 is the first exhaust path 370.

[0024] Furthermore, the path that heads downward from the flow path direction changing position 360 to the exhaust position 362 is a third exhaust path 374. The exhaust position 362 is connected to the above-mentioned terminal 252. Although details will be described later, the terminal 252 is also called an outer exhaust port, so it can be said that the third exhaust path 374 heads from the flow path direction changing position 360 to the outer exhaust port.

[0025] At flow path direction changing position 360, left guide portion 338 is provided on left-side third surface 332, and right guide portion 348 is provided on right-side third surface 342. The combination of left guide portion 338 and right guide portion 348 is also called a "guide portion" and protrudes downward. The guide portions correspond to parts of walls provided to surround first exhaust path 370, second exhaust path 372, and third exhaust path 374 on first surface 330, second surface 340, and third surface.

[0026] 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. Because the multiple storage battery cells 410 are arranged horizontally in the battery holder 400, it can be said that the left protective wall 334 and the right protective wall 344 cover at least a portion of the side surfaces of the multiple storage battery cells 410.

[0027] 1(c), is covered by the synthetic resin bag 200 as shown in FIG. 1(b), so that the multiple storage battery cells 410 are covered by the synthetic resin bag 200 inside the outer case 100. Also, because 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 heat sink 310. Furthermore, the outer exhaust port, which is the terminal 252, can be said to connect the space between the inner case 300 and the outer case 100 to the outside of the outer case 100.

[0028] The following describes a path through which high-temperature, high-pressure gas ejected from the storage battery cell 410 is exhausted from the storage battery module 1000 when one of the storage battery cells 410 experiences thermal runaway. FIG. 3 is a perspective view showing an exhaust path in the storage battery module 1000. Here, the left side of the storage battery module 1000 is shown facing up. In order to describe 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 multiple storage battery cells 410 are arranged with their positive electrodes facing the battery holder first surface 402, and the remaining multiple storage battery cells 410 are arranged with their negative electrodes facing the battery holder first surface 402.

[0029] When the storage battery cell 410 experiences thermal runaway, the storage battery cell 410 ejects high-temperature, high-pressure gas from at least one of the positive and negative electrodes, and in some cases from both ends. As a result, for example, high-temperature, high-pressure gas is ejected into 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)). 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)), so the high-temperature, high-pressure gas heads toward the first inner exhaust port 336 while in contact with the first surface 330. At that time, the temperature of the high-temperature, high-pressure gas is reduced by contacting the first surface 330. Here, the path from the storage battery cell 410 to the first inner exhaust port 336 is the inner exhaust path 420. The same applies to the high-temperature, high-pressure gas that is ejected into the space between the battery holder second surface 404 and the second surface 340, so a description thereof will be omitted here.

[0030] FIG. 4 is a perspective view showing an exhaust path in the battery module 1000. This is shown in the same direction as FIG. 4. In addition, in order to explain the inside of the battery module 1000, the front left plate 112, the rear left plate 122, and the synthetic resin bag 200 are omitted. The left heat sink plate 322 is also omitted in the drawing, but in reality, the left heat sink plate 322 is arranged on the upper surface in FIG. 4. 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 moves toward the first route position 350 while contacting the first surface 330 and the first outer plate 110a. Since the left heat sink plate 322 is provided between the first surface 330 and the first outer plate 110a, it can be said that the high-temperature, high-pressure gas moves toward the first route position 350 while also contacting the left heat sink plate 322. As a result, the temperature of the high-temperature, high-pressure gas is reduced. The first passing position 350 is a portion that connects the first surface 330 to the third surface. Here, the path from the first inner exhaust port 336 to the first passing position 350 is included in the first exhaust path 370 described above.

[0031] FIG. 5 is a perspective view showing an exhaust path in the battery module 1000. Here, the battery module 1000 is shown with the front side facing up. In addition, the front plate 110 and the synthetic resin bag 200 are omitted in order to explain the inside of the battery module 1000. The heat sink 310 is also omitted in the drawing, but the heat sink front plate 320 is actually arranged on the upper surface in FIG. 5. The high-temperature, high-pressure gas traveling along the first exhaust path 370 moves from the first passing position 350 to the third surface and heads toward the flow direction changing position 360. Meanwhile, the high-temperature, high-pressure gas ejected into the space between the battery holder second surface 404 and the second surface 340 passes through the second inner exhaust port 346 and the second surface 340, moves from the second passing position 352 to the third surface, and heads toward the flow direction changing position 360. The second passing position 352 is a portion that connects the second surface 340 to the third surface.

[0032] As described above, at flow path direction changing position 360, the guide portion formed by combining left guide portion 338 and right guide portion 348 protrudes downward, so that the high-temperature, high-pressure gas proceeding along first exhaust path 370 and second exhaust path 372 is bent downward near flow path direction changing position 360. The high-temperature, high-pressure gas that has reached flow path direction changing position 360 proceeds to exhaust position 362 along third exhaust path 374. At that time, the high-temperature, high-pressure gas comes into contact with the third surface and heat sink front plate 320, and the temperature is reduced.

[0033] If the guide portion is not provided at the flow path direction changing position 360, the high-temperature, high-pressure gas entering the third surface from the first passing position 350 is less likely to bend downward near the flow path direction changing position 360, and travels straight toward the second passing position 352. This makes it difficult for the high-temperature, high-pressure gas to travel toward the exhaust position 362. As a result, the temperature of the space between the third surface and the heat sink front plate 320 increases. The same is true for the high-temperature, high-pressure gas entering the third surface from the second passing position 352, which is less likely to bend downward near the flow path direction changing position 360 and travels straight toward the first passing position 350. In other words, the guide portion is provided to direct 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 to the outside from the terminal 252. Therefore, as described above, the terminal 252 can also be said to be an external exhaust port.

[0034] According to this embodiment, the high-temperature, high-pressure gas ejected from the storage battery cell 410 passes through the first exhaust path 370 and the third exhaust path 374 and is released from the terminal 252, so that the path through which the high-temperature, high-pressure gas passes can be lengthened in the storage battery module 1000. The high-temperature, high-pressure gas that has passed through the second exhaust path 372 is similarly released from the terminal 252 through the third exhaust path 374. In addition, since the path through which the high-temperature, high-pressure gas passes can be lengthened in the storage battery module 1000, the cooling effect of the high-temperature, high-pressure gas is improved, and the high-temperature, high-pressure gas can be sufficiently cooled. In addition, since the high-temperature, high-pressure gas is sufficiently cooled, it is possible to prevent the high-temperature, high-pressure gas ejected from a battery that has gone into thermal runaway from being released to the outside at a high temperature, and the thermal impact on the surroundings of the storage battery module 1000 can also be reduced. In addition, a guide portion is provided at the flow path direction change position 360 to direct 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, so that the high temperature, high pressure gas can be efficiently directed toward the third exhaust path 374.

[0035] Furthermore, since the multiple storage battery cells 410 are covered with the synthetic resin bags 200 inside the outer case 100, the waterproof performance of the storage battery module 1000 can be improved. Furthermore, since the multiple storage battery cells 410 are covered with the synthetic resin bags 200 inside the outer case 100, a part of the synthetic resin bag 200 melts and opens a hole due to the high-temperature, high-pressure gas released from the exhaust position 362, and the gas can be released to the outside mainly through the through-hole. Furthermore, since most of the high-temperature, high-pressure gas ejected from the storage battery cells 410 can be released to the outside through the through-holes opened in the synthetic resin bags 200, an increase in the amount of air supplied to the storage battery cells 410 that eject high-temperature, high-pressure gas can be suppressed. Since an increase in the amount of air supplied to the storage battery cells 410 that eject high-temperature, high-pressure gas is suppressed, the occurrence of ignition can be suppressed.

[0036] Furthermore, 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 ejects high-temperature, high-pressure gas. Furthermore, since the first outer case 100a houses the inner case 300 and the second outer case 100b does not house the inner case 300, the structure can be simplified. Furthermore, since the first outer case 100a has the display unit 140 and the second outer case 100b does not have the display unit 140, the structure can be simplified.

[0037] An overview of one embodiment of the present disclosure is as follows: A storage battery module (1000) according to one embodiment 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), an outer case (100) that houses the inner case (300), and an outer exhaust port (252) that connects a space between the inner case (300) and the outer case (100) to the outside of the outer case (100). The inner case (300) has a first surface (330), a second surface (340), and a third surface facing the outer case (100), the first surface (330) and the second surface (340) facing opposite directions, and the third surface is disposed between the first surface (330) and the second surface (340), and the inner case (300) has a first inner exhaust port (336) provided on the first surface (330) and a second inner exhaust port (346) provided on the second surface (340). In the space between the inner case (300) and the outer case (100), there are provided a first exhaust path (370) from the first inner exhaust port (336) to the flow path direction change position (360) on the third surface (332, 342), a second exhaust path (372) from the second inner exhaust port (346) to the flow path direction change position (360), and a third exhaust path from the flow path direction change position (360) to the outer exhaust port (252). At the flow path direction change position (360), guide portions (338, 348) are provided to direct gas from the first exhaust path (370) and gas from the second exhaust path (372) toward the third exhaust path (374).

[0038] The plurality of storage battery cells (410) are enclosed in a synthetic resin bag (200) within the outer case (100).

[0039] The inner case (300) may further include protective walls (334, 344) that cover at least a portion of the side surfaces of the multiple storage battery cells (410).

[0040] The outer case (100) may include a first outer case (100a) and a second outer case (100b). The first outer case (100a) houses the inner case (300), and the second outer case (100b) covers the opening of the first outer case (100a).

[0041] The first outer case (100a) may have a display unit (140) for displaying the state of the multiple storage battery cells (410). The second outer case (100b) does not have a display unit (140).

[0042] Some of the multiple storage battery cells (410) are arranged within the inner case (300) with their positive electrodes facing the first surface (330), and the rest of the multiple storage battery cells (410) are arranged within the inner case (300) with their positive electrodes facing the second surface (340).

[0043] 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. [Explanation of symbols]

[0044] 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 unit, 200 synthetic resin bag, 250 terminal assembly, 252 terminal (outer exhaust port), 300 inner case, 310 heat sink, 320 heat sink front plate, 322 heat sink left plate, 324 heat sink right plate, 330 first surface, 332 left third surface, 334 left protective wall (protective wall), 336 first inner exhaust port, 338 left guide portion (guide portion), 340 second surface, 342 right side third surface, 344 right side protective wall (protective wall), 346 second inner exhaust port, 348 right side guide portion (guide portion), 350 first route position, 352 second route position, 360 flow path direction change 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 storage battery cell, 420 inner exhaust path, 1000 storage battery module.

Claims

1. 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 outer exhaust port that connects a space between the inner case and the outer case to 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 the third surface being disposed between the first surface and the second surface; 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, a first exhaust path from the first inner exhaust port to a flow path direction changing position on the third surface, a second exhaust path from the second inner exhaust port to the flow path direction changing position, and a third exhaust path from the flow path direction changing position to the outer exhaust port, a guide portion for directing gas from the first exhaust path and gas from the second exhaust path to the third exhaust path is provided at the flow path direction changing position. Battery module.

2. The plurality of storage battery cells are covered with a synthetic resin bag inside the outer case. The battery module according to claim 1 .

3. The battery module according to claim 1 , wherein the inner case further includes a protective wall that covers at least a portion of a side surface of the plurality of battery cells.

4. The outer case includes a first outer case and a second outer case, the first outer case houses the inner case, The second outer case covers the opening of the first outer case. The storage battery module according to claim 1 .

5. the first outer case has a display unit for displaying a state of the plurality of storage battery cells, The second outer case does not have the display unit. The battery module according to claim 4 .

6. Some of the storage battery cells are arranged in the inner case with their positive electrodes facing the first surface side, The remaining battery cells are arranged in the inner case with their positive electrodes facing the second surface side. The storage battery module according to claim 1 , arranged in a manner such that

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