JP2010282854A - Gas discharge device of battery pack - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a gas discharge device capable of increasing airtightness of an exhaust passage until the gas emitted from a battery pack is discharged to the outside. <P>SOLUTION: The gas discharge device of a battery pack 10 includes: a body part 210 having a passage for exhausting gas to the outside of a battery module 11; and an introduction part 223 which is connected to gas exhaust parts 141, 16 installed in the battery module 11 and introduces the gas generated inside the battery module 11 to the body part 210. Engagement part 221 for engaging with the gas exhaust parts 141, 16 and a sealing member 224 for sealing the connecting portion are formed at the connecting portion of the introduction part 223 and the battery module 11. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  The present invention relates to an assembled battery gas discharge device.

  Conventionally, a member for discharging the gas generated by the assembled battery is provided between the assembled battery and the upper cover that covers the assembled battery, and the gas is discharged through a flow path formed by covering the member with the upper cover of the assembled battery. The technique which performs is known (patent document 1). Moreover, the technique which discharges | emits the gas which generate | occur | produced in the cell by attaching the member for discharge | emission to the gas discharge port provided in the side surface of the cell case which accommodates a cell is known (patent document 2).

JP 2002-151025 A JP 2006-236605 A

  However, in Patent Document 1 described above, the flow path for discharging the gas is formed by combining the upper cover that covers the assembled battery and the member for discharging the gas. It was difficult to ensure the sex. Further, in Patent Document 2 described above, since the discharge member is fitted to the discharge port of the cell case, for example, when tolerance variation occurs in the discharge member or the cell case, the discharge member and the cell In some cases, the airtightness of the connection portion with the discharge port of the case cannot be sufficiently ensured.

  The problem to be solved by the present invention is to provide a gas discharge device capable of improving the airtightness of the discharge flow path for discharging the gas discharged from the assembled battery to the outside.

  The present invention relates to a gas discharge device including a main body having a flow path for discharging gas to the outside of the battery module, and an introduction section for guiding the gas generated inside the battery module to the main body. The above-mentioned problem is solved by providing a fitting part for fitting to the gas discharge part and a sealing member for sealing the connection part between the introduction part and the battery module at the connection part.

  ADVANTAGE OF THE INVENTION According to this invention, the airtightness in the discharge flow path for discharging | emitting the gas discharge | released from an assembled battery outside can be improved.

It is a perspective view which shows the assembled battery apparatus which concerns on 1st Embodiment. It is a perspective view of the state which rotated the assembled battery apparatus which concerns on FIG. 1 180 degree | times centering on the X-axis. It is a disassembled perspective view of an assembled battery module. It is a perspective view which shows the gas discharge apparatus of the assembled battery which concerns on 1st Embodiment. It is the enlarged view to which the connection part of the gas exhaust apparatus of FIG. 4 was expanded. It is an expanded sectional view which follows the VI-VI line of FIG. It is an expanded sectional view which follows the VI-VI line of FIG. 5 of the state which attached the gas exhaust apparatus to the assembled battery. It is a principal part disassembled perspective view of an assembled battery unit. It is a perspective view which shows the gas discharge apparatus of the assembled battery which concerns on 2nd Embodiment.

<< First Embodiment >>
DESCRIPTION OF EXEMPLARY EMBODIMENTS Hereinafter, a first embodiment of the invention will be described with reference to the drawings.

  FIG. 1 is a perspective view showing the assembled battery device 1. FIG. 2 is a perspective view of the assembled battery device 1 shown in FIG. 1 rotated 180 degrees around the X axis. As shown in FIGS. 1 and 2, the assembled battery device 1 includes an assembled battery 10 and a gas discharge device 20. Specifically, the assembled battery device 1 is configured by assembling the gas discharge device 20 to the assembled battery 10.

  The assembled battery 10 includes a plurality of assembled battery modules 11 as shown in FIGS. 1 and 2. The plurality of assembled battery modules 11 constituting the assembled battery 10 have the same structure, and the plurality of assembled battery modules 11 are connected in a desired electric circuit configuration. Thus, the assembled battery 10 having a desired voltage and capacity is configured.

  FIG. 3 is an exploded perspective view of the assembled battery module 11. As shown in FIG. 3, the assembled battery module 11 includes a plurality of single cells 15 and a pair of assembled battery module cases 13 and 14, and the plurality of single cells 15 are formed by the pair of assembled battery module cases 13 and 14. The assembled battery module 11 is configured by housing.

  The unit cell 15 housed in the assembled battery module 11 is a rectangular flat unit cell in which a power generation element formed by laminating a positive electrode and a negative electrode plate and a separator in a battery exterior made of a laminate film is sealed. is there. The assembled battery module 11 is configured by connecting a plurality of the unit cells 15 in series and stacking them so as to form a rectangular parallelepiped shape as a whole as shown in FIG. Further, a plus terminal 151 and a minus terminal 152 are provided at the short side end of the plurality of single cells 15 so as to be led out from the case 14 of the assembled battery module 11. The plus terminal 151 and the minus terminal 152 are connected to the minus terminal 152 of one assembled battery module 11 and the other set of other neighboring assembled battery modules 11 constituting the assembled battery 10 via a connection member (not shown). The battery module 11 is connected to the plus terminal 151 respectively. And thereby, each assembled battery module 11 which comprises the assembled battery 10 is electrically connected mutually.

  Examples of the unit cell 15 include a lithium ion battery, and the unit cell 15 is an exhaust gas valve (not shown) for discharging the generated gas when gas is generated in the unit cell 15. Is equipped. Further, the case 14 of the assembled battery module 11 is provided with a gas discharge hole 16 that communicates the inside and the outside of the assembled battery module 11. As shown in FIG. 2, the gas discharge hole 16 is connected to a gas discharge device 20. As a result, when gas is generated in the unit cell 15 accommodated in the assembled battery module 11, the generated gas is guided from the gas discharge hole 16 into the gas discharge device 20. Yes.

  The assembled battery 10 of the present embodiment is composed of a plurality of assembled battery modules 11 as shown in FIG. 1 and FIG. 2, and each assembled battery module 11 of the present embodiment is as shown in FIG. Although it is composed of a plurality of unit cells 15, the number of the assembled battery modules 11 constituting the assembled battery 10 and the number of the unit cells 15 constituting the assembled battery module 11 are not particularly limited. The configuration may include only one assembled battery module 11, or the assembled battery module 11 may include only one single battery 15. Furthermore, the assembled battery 10 may be configured to include only one assembled battery module 11 including only one single battery 15.

  FIG. 4 is a perspective view showing the gas discharge device 20. As shown in FIG. 4, the gas discharge device 20 includes a discharge pipe 210 and a plurality of connecting portions 220 provided in the discharge pipe 210 at equal intervals. The gas discharge device 20 is connected to the gas discharge hole 16 of the assembled battery module 11 via the connection unit 220, thereby discharging the gas generated in the unit cell 15 accommodated in the assembled battery module 11 to the discharge pipe. 210 is discharged from the discharge unit 211. In addition, as shown in FIG. 2, the connection portions 220 are installed in the discharge pipe 210 at equal intervals according to the thickness of the assembled battery module 11, whereby each connection portion 220 is connected to each assembled battery module 11. It can be connected to the gas discharge hole 16.

  The discharge pipe 210 includes a flow path for flowing gas from the assembled battery module 11 along the longitudinal direction of the discharge pipe 210. And the gas from the assembled battery module 11 is discharged | emitted from the discharge part 211 through this flow path.

  Next, the connection part 220 is demonstrated with reference to FIG. 5, FIG. FIG. 5 is an enlarged view showing an arbitrary connecting portion 220 and its periphery among a plurality of connecting portions 220 provided in the gas discharge device 20 of FIG. 6 is an enlarged cross-sectional view taken along the line VI-VI in FIG. The connection part 220 is a member for connecting the gas discharge device 20 and the assembled battery module 11, and each connection part 220 includes an introduction hole 223 provided in each connection part 220 and the assembled battery module shown in FIG. 11 gas discharge holes 16 are connected to the vicinity of the gas discharge holes 16 of the assembled battery module 11 so as to be connected. As shown in FIG. 5, the connection part 220 includes a pair of fitting parts 221, a pair of wall parts 222, an introduction hole 223, and a sealing member 224.

  The pair of fitting portions 221 are members for fitting into the peripheral portion 141 of the gas discharge hole 16 of the assembled battery module 11. As shown in FIG. 6, the pair of fitting portions 221 includes a hook portion 225 at the tip, and is further deformable to the inner diameter side of the introduction hole 223. As a result, the hook portion 225 can move along the radial direction of the introduction hole 223. The material for forming the fitting portion 221 is not particularly limited, and includes, for example, various resin materials such as polyvinyl chloride, polypropylene, polyethylene, and polyethylene terephthalate, or these resin materials and other elastic materials. A relatively hard synthetic material or the like can be used.

  Further, as shown in FIG. 5, the pair of fitting portions 221 are disposed concentrically with the pair of wall portions 222 as viewed from the Z-axis direction. The pair of fitting portions 221 and the pair of wall portions 222 are arranged. On the inner diameter side, an introduction hole 223 for guiding the gas discharged from the gas discharge hole 16 of the assembled battery module 11 to the discharge pipe 210 is formed.

  On the outer peripheral side of the pair of fitting portions 221, the pair of wall portions 222, and the introduction hole 223, a skirt-shaped seal is formed so as to cover the pair of fitting portions 221, the pair of wall portions 222, and the introduction hole 223. A member 224 is formed. The sealing member 224 is, for example, a rubber-like material made of various elastic materials such as silicone rubber, urethane rubber, nitrile rubber, ethylene propylene rubber, and fluorine rubber, or a relatively soft synthetic material of these elastic materials and other resin materials. It is comprised from the member, By this, it has rubber elasticity.

  Here, as described above, the sealing member 224 is composed of a rubber-like member made of an elastic material or a relatively soft synthetic material of an elastic material and a resin material. Like the fitting part 221, it is comprised from the comparatively hard synthetic material of a resin material or a resin material, and an elastic material. That is, the fitting portion 221 is made of the same material as the discharge pipe 210, while the sealing member 224 is made of a material different from that of the discharge pipe 210. Therefore, in this embodiment, when providing the sealing member 224 in the discharge pipe 210, it is preferable to use any one of two-color molding, ultrasonic welding, thermal welding, and laser welding. Thereby, the connection structure between the sealing member 224 and the discharge pipe 210 can be made favorable, and as a result, the gas tightness of the gas discharge device 20 as a whole can be improved.

  As shown in FIG. 5, the discharge pipe 210 is formed with an expansion / contraction part 212 between two adjacent connection parts 220. The expansion / contraction part 212 is formed in a bellows shape, and is extendable in the Y-axis direction (longitudinal direction of the discharge pipe 210). As a result, the distance between the adjacent connecting portions 220 can be adjusted, and even if there is a tolerance in the thickness direction in each battery module 11 constituting the assembled battery 10, there is a variation. Can be absorbed.

  Next, a method for assembling the gas discharge device 20 to the assembled battery 10 will be described with reference to FIG. FIG. 7 is an enlarged cross-sectional view taken along line VI-VI in FIG. 5 in a state where the gas discharge device 20 is assembled to the assembled battery 10. When the gas discharge device 20 is assembled to the assembled battery 10, first, the pair of fitting portions 221 provided in each connection portion 220 is inserted into the gas discharge holes 16 of each assembled battery module 11. Next, as shown in FIG. 7, the hook portions 225 of the pair of fitting portions 221 are hooked on the inner wall of the peripheral portion 141 forming the gas discharge hole 16 in the case 14 of the assembled battery module 11. The fitting portion 221 is fitted to the peripheral portion 141 of the case 14, whereby the gas discharge device 20 can be assembled to the assembled battery 10 via each connection portion 220.

  Here, when the gas discharge device 20 is assembled to the assembled battery 10, the sealing member 224 is pressed against the outer wall of the case 14 of the assembled battery module 11. As described above, since the sealing member 224 is formed of a rubber-like member made of an elastic material or a relatively soft synthetic material of an elastic material and a resin material, the sealing member 224 is pressed against the outer wall of the case 14 of the assembled battery module 11. Then, the sealing member 224 shown in FIG. 6 is crushed and deformed so as to expand to the outer peripheral side as shown in FIG. Then, as shown in FIG. 7, when the pair of fitting portions 221 are fitted to the peripheral portion 141 of the case 14 of the assembled battery module 11, the sealing member 224 is attached to the assembled battery module 11 by the pair of fitting portions 221. The case 14 is pulled toward the outer wall. Thus, the sealing member 224 is maintained in a state of being pressed against the outer wall of the case 14 of the assembled battery module 11, and the sealing member 224 is deformed while remaining deformed so as to expand to the outer peripheral side of the sealing member 224. Since the sealing member 224 has an elastic force to restore the deformed shape to the original shape shown in FIG. 6, the sealing member 224 acts to push back the outer wall of the case 14 of the assembled battery module 11. That is, when the pair of fitting portions 221 are fitted to the peripheral portion 141 of the case 14 of the assembled battery module 11, the sealing member 224 and the case 14 outer wall of the assembled battery module 11 act so as to press each other. The sealing member 224 is in a steady state when the force pushed from the outer wall of the case 14 of the assembled battery module 11 and the force pushing back the outer wall of the case 14 of the assembled battery module 11 are balanced. As described above, in this embodiment, when the pair of fitting portions 221 are fitted to the peripheral portion 141 of the case 14 of the battery module module 11, the sealing member 224 and the case 14 outer wall of the battery module module 11 are closely attached. Therefore, it is possible to secure the sealing property of the connecting portion between the gas discharge hole 16 of the assembled battery module 11 and the introduction hole 223 of the gas discharge device 20.

  The assembled battery device 1 having such a configuration is made into an assembled battery unit by being housed in an exterior member formed from the lower case 30 and the upper case, and is mounted on, for example, an electric vehicle and a hybrid vehicle. . Here, FIG. 8 is an exploded perspective view of a main part of the assembled battery unit that houses the assembled battery 10. FIG. 8 shows the assembled battery 10, the gas discharge device 20, and the lower case 30 among the components of the assembled battery unit, and the upper case is not shown. As shown in FIG. 8, the assembled battery device 1 is placed on the lower case 30, and the assembled battery device 1 placed on the lower case 30 is covered with an upper case (not shown), whereby the assembled battery device 1 is assembled. It can be accommodated in a unit case to form an assembled battery unit.

  In addition, the upper case of the assembled battery unit is provided with a cutout that matches the size of the discharge part 211 of the gas discharge device 20, and the upper part and the lower case 30 are combined to form the discharge part 211. A hole for leading out the unit is formed. Accordingly, when the assembled battery device 1 placed on the lower case 30 is covered with the upper case to form an assembled battery unit, the discharge unit 211 passes through the hole for the gas discharge device formed in the assembled battery unit. , And is led out of the case of the assembled battery unit.

  In the present embodiment, the plurality of single cells 15 housed in the assembled battery module 11 are provided with exhaust gas valves, and the case 14 of the assembled battery module 11 includes an inside and an outside of the assembled battery module 11. Is provided with a gas discharge hole 16. Further, the gas discharge hole 16 of the assembled battery module 11 is connected to the connection part 220 of the gas discharge device 20. Therefore, according to this embodiment, even when gas is generated inside the unit cell 15, the generated gas is discharged into the assembled battery module 11 from the exhaust gas valve provided in the unit cell 15, and The gas is discharged from the gas discharge hole 16 to the gas discharge device 20 through the introduction hole 223 provided in the connection part 220.

  Further, the gas discharge device 20 is provided with an introduction hole 223 that guides the gas to the discharge pipe 210, and the discharge portion 211 of the discharge pipe 210 is led out of the assembled battery unit. Therefore, according to the present embodiment, the gas released from the gas discharge hole 16 of the battery module 11 is guided from the introduction hole 223 to the discharge pipe 210, and the guided gas is transferred from the discharge portion 211 of the discharge pipe 210. It can be discharged outside the assembled battery unit.

  The gas discharge device 20 of the present embodiment employs a configuration in which the connection portion between the gas discharge hole 16 of the battery module 11 and the introduction hole 223 of the gas discharge device 20 is sealed with a sealing member 224. In the flow path until the gas generated in step 221 is discharged from the discharge part 221 of the gas discharge device 20, the gas is prevented from leaking into the case of the assembled battery unit, and the gas tightness in the flow path from which the gas is discharged Can be increased.

  Further, in the gas discharge device 20 of the present embodiment, the front ends of the pair of fitting portions 221 that are fitted into the peripheral portions 141 of the gas discharge holes 16 of the respective assembled battery modules 11 are the hook portions 225, When the discharge device 20 is assembled to the assembled battery 10, the gas discharge hole 16 of each assembled battery module 11 is fitted to the peripheral portion 141 of the gas discharge hole 16 so that the hook portion 225 of the pair of fitting portions 221 is hooked. The discharge device 20 can be assembled to the assembled battery 10.

  Furthermore, the gas discharge device 20 of the present embodiment is provided with a skirt-shaped sealing member 224. As shown in FIG. 7, when the gas discharge device 20 is assembled to the assembled battery 10, the sealing member 224 has a connection portion between the gas discharge hole 16 provided in the case 14 of the assembled battery module 11 and the introduction hole 223. It is formed so as to be sealed. As a result, the gas released from the assembled battery module 11 is prevented from leaking into the case of the assembled battery unit that houses the assembled battery 10, and the gas discharged from the assembled battery module 11 is removed from the gas discharge device 20. It can be made to pass through and appropriately discharged outside the assembled battery unit.

  In particular, since the sealing member 224 of the gas discharge device 20 is formed of a rubber-like member made of an elastic material or a relatively soft synthetic material of an elastic material and a resin material, the sealing member 224 is formed from the case 14 of the assembled battery module 11. It can be closely attached to the outer wall. As a result, it is possible to improve the sealing performance at the connection portion between the gas discharge hole 16 of the assembled battery module 11 and the introduction hole 223 of the gas discharge device 20, and the gas released from the assembled battery module 11 is discharged to the outside of the assembled battery unit. The airtightness in the flow path until it is discharged can be improved.

  Furthermore, as shown in FIG. 7, when the hooking portion 225 of the pair of fitting portions 221 is hooked on the peripheral portion 141 of the case 14 of the assembled battery module 11, the sealing member 224 is pulled by the hooking portion 225. Therefore, the sealing member 224, which is a rubber-like member, is pressed against the outer wall of the case 14 of the assembled battery module 11, and the sealing portion 224 is deformed so as to expand toward the outer peripheral side. On the other hand, the deformed sealing member 224 has an elastic force to restore the deformed shape shown in FIG. 7 to the original shape shown in FIG. 6, and therefore the outer wall of the case 14 of the battery module module 11 from the sealing member 224. The sealing member 224 can improve the sealing performance at the connecting portion between the gas discharge hole 16 of the assembled battery module 11 and the introduction hole 223 of the gas discharge device 20 by the sealing member 224.

  In addition, the hook portion 225 of the pair of fitting portions 221 of the gas discharge device 20 has a tip portion formed in a tapered shape. Therefore, when the pair of fitting portions 221 are inserted into the gas discharge holes 16 of the assembled battery module 11, the hook portion 225 extends from the peripheral portion 141 of the gas discharge holes 16 of the assembled battery module 11 to the inner diameter of the fitting portion 221. The pair of fitting portions 221 are pushed to the side and deformed to bend toward the inner diameter side of the fitting portion 221. And if a pair of fitting part 221 passes the thick part of case 14 of the assembled battery module 11, a pair of fitting part 221 which was bent to the internal diameter side of the fitting part 221 will restore | restore by elastic force, and work Can be clicked and clicked. As a result, the operator can feel that the gas discharge device 20 is properly attached to the assembled battery 10. As a result, it is possible to appropriately detect a fitting failure when the gas discharge device 20 is assembled to the assembled battery 10, and it is possible to improve the work efficiency of the assembling work.

  Further, in the gas discharge device 20 of the present embodiment, the expansion / contraction part 212 is formed between the adjacent connection parts 220 of the discharge pipe 210. The expansion / contraction part 212 is formed in a bellows shape, and is expandable / contractible in the Y-axis direction (stacking direction of the assembled battery module 11), which is the longitudinal direction of the discharge pipe 210. Thereby, even if the assembled battery module 11 has a tolerance variation in the stacking direction (Y-axis direction), the expansion / contraction part 212 expands and contracts in the stacking direction (Y-axis direction) of the assembled battery module 11, Since the distance between the adjacent connection parts 220 can be adjusted, the tolerance variation produced in the assembled battery module 11 can be absorbed. Further, since the stretchable portion 212 is formed, the gas discharge device 20 can be easily assembled to the assembled battery 10 even when tolerance variation occurs in the assembled battery module 11. Productivity can be improved.

  Furthermore, since the gas discharge device 20 of the present embodiment can absorb the tolerance variation of the assembled battery module 11 by the expansion / contraction part 212, the problem in the case where the tolerance variation in the stacking direction of the assembled battery module 11 cannot be absorbed. That is, when the tolerance variation in the stacking direction of the assembled battery module 11 occurs, the stress load in the Y-axis direction (stacking direction of the assembled battery module 11) increases in the pair of fitting portions 221. It is possible to effectively prevent the problem that 221 cannot be properly fitted to the peripheral portion 141 of the case 14 that forms the gas discharge hole 16 of the battery module 11.

  Furthermore, in the gas discharge apparatus 20 of this embodiment, the structure which makes the hook part 225 fit to the peripheral part 141 of the case 14 of the assembled battery module 11 is taken, and the protrusion height of a pair of hook part 225 is taken. When the hook portion 225 is fitted to the peripheral portion 141 of the case 14 that forms the gas discharge hole 16 of the assembled battery module 11 by forming the taper shape of the hook portion 225 so as to be low. Interference with the unit cell 15 accommodated in the battery module 11 can be effectively prevented.

<< Second Embodiment >>
Subsequently, a second embodiment of the present invention will be described. In 2nd Embodiment, it has the structure similar to 1st Embodiment except having used the gas discharge apparatus 20a shown in FIG. 9 instead of the gas discharge apparatus 20 which comprises the assembled battery apparatus shown in FIG. FIG. 9 is a diagram illustrating a gas discharge device 20a of the battery pack 10 according to the second embodiment. As shown in FIG. 9, the gas exhaust device 20 a according to the second embodiment has the gas according to the first embodiment shown in FIG. 4 except that the exhaust pipe 210 further includes protrusions 213 and 214 and a baffle plate 215. It has the same configuration as the discharge device 20. In the following, the protrusions 213 and 214 and the baffle plate 215 that are differences between the gas discharge device 20a according to the second embodiment and the gas discharge device 20 according to the first embodiment will be described.

  The protrusions 213 and 214 are formed at predetermined intervals along the extending direction of the discharge pipe 210 on the lower surface side of the discharge pipe 210, that is, on the surface opposite to the protruding direction of the connection section 220. The lengths of the protrusions 213 and 214 are the same as those of the gas discharge device 20a when the gas discharge device 20a is assembled to the assembled battery 10 and placed in the lower case 30 of the assembled battery unit as shown in FIG. The end portion of 214 is formed to be in contact with the surface of the lower case 30 of the assembled battery unit. That is, when the gas discharge device 20a of the second embodiment is assembled to the assembled battery 10 and accommodated in the assembled battery unit, the gas discharge device 20a is attached to the lower case 30 of the assembled battery unit via the protrusions 213 and 214. It is formed to be in contact.

  The gas discharge device 20a according to the second embodiment forms a gas discharge hole 16 of each assembled battery module 11 via a pair of fitting portions 221 in the same manner as the gas discharge device 20 according to the first embodiment. 14 is held in the assembled battery 10 by being fitted to the peripheral portion 141 of the 14. In addition, since the protruding portions 213 and 214 are formed in the gas discharge device 20a according to the second embodiment, even when the pair of fitting portions 221 are detached from the assembled battery module 11, the protruding portions 213 and 214 are provided. Is in contact with the lower case 30 of the assembled battery unit, it is possible to prevent the gas discharge device 20a from being detached from the assembled battery 10 and falling. Thereby, the reliability which ensures the airtightness of the gas exhaust apparatus 20a can be improved.

  Further, the baffle plate 215 prevents the cooling air for cooling the assembled battery 10 from leaking outside the assembled battery unit. Here, the temperature of the assembled battery 10 may rise due to charging / discharging during use. In such a case, cooling air is supplied into the assembled battery unit by a battery cooling device (not shown) provided in the assembled battery unit. The battery pack 10 is configured to be cooled by blowing air. In the second embodiment, the baffle plate 215 guides the discharge part 211 of the gas discharge device 20a to the outside of the assembled battery unit (the hole for the gas discharge device and the gas discharge device). It is possible to effectively prevent the cooling air from leaking from the battery cooling device from the gap between the device 20a).

  The lower end portion of the baffle plate 215 (the portion of the baffle plate 215 that protrudes in the same direction as the projections 213 and 214) is assembled in the lower case 30 of the assembled battery unit by assembling the gas discharge device 20a to the assembled battery 10. When mounted, the baffle plate 215 is formed so that the lower end portion of the baffle plate 215 comes into contact with the lower case 30, so that the baffle plate 215 has a pair of fitting portions 221 together with the protruding portions 213 and 214. 11 has an effect of preventing the gas discharge device 20a from dropping from the assembled battery 10 when it is detached from the battery pack 11.

  As mentioned above, according to 2nd Embodiment, in addition to the effect in 1st Embodiment mentioned above, there exist the following effects. That is, the gas discharge device 20a of the second embodiment is mounted on the assembled battery 10 in the lower case 30 of the assembled battery unit by assembling the gas discharge device 20a on the assembled battery 10 on the side opposite to the installation direction of the connecting portion 220 on the discharge pipe 210. The protrusions 213 and 214 and the baffle plate 215 are provided so as to come into contact with the lower case 30 when placed. Accordingly, even when the pair of fitting portions 221 is detached from the assembled battery module 11, the gas discharge device 20 a is in contact with the lower case 30 at the protrusions 213 and 214 and the baffle plate 215. It is possible to effectively prevent the device 20a from falling off the assembled battery 10.

  Further, in the gas discharge device 20a of the second embodiment, a baffle plate 215 is provided, and a gas discharge device hole (gas discharge) that leads the discharge portion 211 of the gas discharge device 20a to the outside of the assembled battery unit. It is possible to effectively prevent leakage of cooling air from the battery cooling device from a gap between the device hole and the gas discharge device 20a.

  The embodiment described above is described for facilitating understanding of the present invention, and is not described for limiting the present invention. Therefore, each element disclosed in the above embodiment is intended to include all design changes and equivalents belonging to the technical scope of the present invention.

  The assembled battery module 11 of the embodiment described above is the battery module of the present invention, the peripheral portion 141 and the gas discharge hole 16 of the battery module case 14 are the gas discharge portion of the present invention, and the discharge pipe 210 is the main body portion of the present invention. The introduction hole 223 corresponds to the introduction portion of the present invention, and the hook portion 225 corresponds to the hook structure of the present invention.

DESCRIPTION OF SYMBOLS 1 ... Assembled battery device 10 ... Assembled battery 11 ... Assembled battery module 13, 14 ... Assembled battery module case 15 ... Cell 16 ... Gas exhaust hole 20 ... Gas exhaust device 210 ... Discharge pipe 211 ... Discharge part 212 ... Extending / contracting part 213 214 ... Projection part 215 ... Baffle plate 220 ... Connection part 221 ... Fitting part 222 ... Wall part 223 ... Introduction hole 224 ... Sealing member 225 ... Hook part 30 ... Lower case

Claims (8)

An assembled battery gas discharge device for discharging gas generated in at least one battery module constituting the assembled battery,
A main body having a flow path for discharging gas to the outside of the battery module;
An introduction unit that is connected to a gas discharge unit provided in the battery module and guides the gas generated inside the battery module to the main body unit;
The connecting part between the introduction part and the battery module is formed with a fitting part for fitting into the gas discharge part and a sealing member for sealing the connection part. Battery gas discharge device. The gas discharge device for an assembled battery according to claim 1,
The fitting portion includes a hook structure for hooking from the inside of a battery module of a gas discharge hole constituting a gas discharge portion provided in the battery module to an inner wall of a case covering the battery module. Battery gas discharge device. A gas discharge device for an assembled battery according to claim 1 or 2,
A gas discharge apparatus for an assembled battery, wherein the sealing member is formed in a skirt shape. A gas discharge device for an assembled battery according to any one of claims 1 to 3,
A gas discharge device for an assembled battery, wherein the sealing member is elastically deformable. A gas discharge device for an assembled battery according to any one of claims 1 to 4,
A plurality of the introduction parts are provided,
A gas discharge device for an assembled battery, wherein a distance between the adjacent introduction portions among the plurality of introduction portions is adjustable. A battery assembly gas discharge device according to claim 5,
A gas discharge device for a battery pack, wherein an extension part is formed in the main body part between the adjacent introduction parts among the plurality of introduction parts. A gas discharge device for an assembled battery according to any one of claims 1 to 6,
A gas discharge device for an assembled battery, wherein the main body portion is further formed with a protrusion that protrudes in the opposite direction to the installation direction of the introduction portion. A gas discharge device for an assembled battery according to any one of claims 1 to 7,
A gas discharge apparatus for an assembled battery, further comprising a baffle plate for preventing a flow of gas flowing in the vicinity of the main body portion in the direction of the discharge port on the discharge port side of the main body portion.

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