JP7051552B2 - Batteries assembled - Google Patents

Description

The present invention relates to an assembled battery.

Conventionally, an assembled battery in which a plurality of batteries are housed in a member such as a housing is known (see, for example, Patent Document 1).

Japanese Unexamined Patent Publication No. 2015-138673

It is required that the gas generated from the battery is safely discharged.

An object of the present invention made in view of this viewpoint is to provide an assembled battery capable of improving safety in gas emission.

In order to solve the above problems, the assembled battery according to the first aspect includes a battery cell, a battery module having a gas discharge pipe for discharging gas generated in the battery cell, and a case covering the battery module. The battery module further includes a guide portion that protrudes in front of the position of the gas discharge pipe in the direction in which the case is inserted into the battery module . The gas discharge pipe is connected to the battery module at at least two places. The guide portion is located between the points where the gas discharge pipe is connected to the battery module.

According to the assembled battery according to the first aspect, the safety in gas emission can be improved.

It is external perspective view of the assembled battery which concerns on one Embodiment. It is an exploded perspective view of the assembled battery of FIG. It is a figure which shows the arrangement example of the battery cell accommodated in the assembled battery of FIG. It is a figure which shows the structure of the bus bar between cells. It is an exploded perspective view which shows the arrangement example of a gas discharge part. It is an exploded perspective view which shows the arrangement example of a BAT case. It is an exploded perspective view which shows the arrangement example of a gas discharge pipe. It is an exploded perspective view which shows the arrangement example of the upper case. It is an enlarged view of the part surrounded by the broken line of FIG. 9 is a cross-sectional view taken along the line AA of FIG. It is sectional drawing which shows the connection example of a gas duct and a tube. It is sectional drawing which shows the other connection example of a gas duct and a tube.

Hereinafter, an embodiment according to the present disclosure will be described with reference to the drawings. The drawings are schematic. The dimensions or ratios on the drawings do not always match the actual ones. The depiction of each component in each drawing may be partially simplified.

As shown in FIG. 1, the assembled battery 100 according to the embodiment includes an upper case 300, a lower case 110, a cell holder 120, a BAT case 130, and a gas discharge pipe 500. The assembled battery 100 has a substantially rectangular parallelepiped shape. The surface of the X-axis facing the positive direction is also referred to as the first side surface of the assembled battery 100. The surface facing the negative direction of the X-axis is also referred to as the second side surface of the assembled battery 100. The surface of the Z-axis facing the positive direction is also referred to as the upper surface of the assembled battery 100. The surface facing the negative direction of the Z axis corresponding to the opposite side of the upper surface is also referred to as the bottom surface of the assembled battery 100. The surface of the Y-axis facing the negative direction is also referred to as the front surface of the assembled battery 100. The surface facing the positive direction of the Y-axis corresponding to the opposite side of the front surface is also referred to as the back surface of the assembled battery 100. The name of each side of the assembled battery 100 can be applied as a name indicating each side of the lower case 110, the cell holder 120 and the BAT case 130. The upper case 300 is also simply referred to as a case. The cell holder 120 is also simply referred to as a holder. The description of "lower part" and "upper part" is an identifier for distinguishing the configuration. In the present embodiment, the configuration shown as the lower case 110 is located at the lower portion of the configuration shown as the upper case 300, but is not limited to the lower portion, and may be located at the upper portion, the side portion, or the like.

The lower case 110, the cell holder 120, the BAT case 130, and the upper case 300 may be made of, for example, a resin such as PBT (Poly-Butylene Terephthalate).

The upper case 300 has a recess 301 in a part of the side where the upper surface and the first side surface are connected. The upper case 300 has a recess 302 in a part of the side where the front surface and the upper surface are connected. The assembled battery 100 includes an external positive electrode terminal 250 and an external negative electrode terminal 270 in the recess 301 and the recess 302, respectively.

The gas discharge pipe 500 discharges the gas discharged from the battery cell 150 (see FIG. 2) from the inside of the case to the outside of the case. The gas discharge pipe 500 may be, for example, a metal tube.

In the present embodiment, it is assumed that the assembled battery 100 is mounted on a vehicle equipped with an internal combustion engine or a vehicle such as a hybrid vehicle capable of traveling by the power of both the internal combustion engine and an electric motor. The assembled battery 100 may be mounted under the seat of the vehicle, for example. The assembled battery 100 may be mounted on the center console of the vehicle, for example. The assembled battery 100 is not limited to the vehicle, and may be used for other purposes.

As shown in FIG. 2, the assembled battery 100 is composed of various parts. The assembled battery 100 includes a battery cell 150 between the cell holder 120 and the lower case 110. The configuration in which the cell holder 120 and the lower case 110 accommodate the battery cell 150 is also referred to as a battery module. The cell holder 120 and the lower case 110 are fastened by a fastening member 112 on the first side surface and the second side surface. The fastening member 112 may be a bolt or the like.

As shown in FIG. 3, the assembled battery 100 accommodates five battery cells 150-1 to 15. The number of battery cells 150 accommodated in the assembled battery 100 is not limited to five. The number of battery cells 150 accommodated in the assembled battery 100 can be appropriately determined according to the maximum output of the battery cells 150, the electric power consumed by the driven device such as a vehicle, and the like.

The battery cell 150 has a substantially rectangular parallelepiped shape having six faces. Two of the six faces of the battery cell 150 have a larger area than the other four faces. Of the surfaces of the battery cell 150, the two surfaces having a relatively large area are also referred to as flat surfaces. The battery cell 150 is arranged so that the flat surface faces the positive direction and the negative direction of the Z axis. In other words, the battery cell 150 is arranged so that the flat surface is substantially parallel to the upper surface and the bottom surface of the assembled battery 100.

In the assembled battery 100 according to the present embodiment, the battery cells 150 are divided into two stages and three stages and stacked in the Z-axis direction. The battery cells 150 stacked in two stages are arranged on the positive side of the X-axis. The battery cells 150 stacked in three stages are arranged on the side in the negative direction of the X-axis. The number of stacked battery cells 150 can be appropriately changed depending on the number of battery cells 150 accommodated in the assembled battery 100. An insulating sheet 155 (see FIG. 2) for insulating the battery cells 150 is arranged between the stacked battery cells 150.

The surface of the battery cell 150 on the negative side of the Y axis is also referred to as a cap surface 151. The battery cell 150 is arranged so that the cap surface 151 faces the front side of the assembled battery 100. The battery cell 150 includes a positive electrode terminal 152, a negative electrode terminal 153, and a safety valve 154 on the cap surface 151. The cap surface 151 has a substantially rectangular shape having a long side and a short side. The positive electrode terminal 152 and the negative electrode terminal 153 are provided near both ends of the cap surface 151 in the long side direction. The positive electrode terminal 152 and the negative electrode terminal 153 are electrodes that output electric power from the battery cell 150. The positive electrode terminal 152 and the negative electrode terminal 153 are collectively referred to as an electrode terminal.

The safety valve 154 is provided between the positive electrode terminal 152 and the negative electrode terminal 153. The safety valve 154 opens to discharge the gas to the outside when the pressure inside the battery cell 150 exceeds a predetermined pressure due to the gas generated inside the battery cell 150. The pressure inside the battery cell 150 may be higher than a predetermined pressure when the battery cell 150 deteriorates over time or when thermal runaway occurs. The predetermined pressure can be appropriately determined according to the specifications of the battery cell 150.

The battery cell 150 is held by the cell holder 120. An insulating sheet 155 is inserted between the battery cells 150. The battery cell 150 may be adhered to the cell holder 120 with an adhesive. The adhesive may be any adhesive capable of adhering the battery cell 150 and the cell holder 120. The adhesive may be, for example, an acrylic adhesive, an epoxy adhesive, or the like. The adhesive may be applied to the cell holder 120. The adhesive may be applied to the portion of the cell holder 120 facing the cap surface 151 of the battery cell 150. The battery cell 150 may be inserted into the cell holder 120 after the adhesive is applied to the cell holder 120.

As shown in FIG. 2, the assembled battery 100 includes an inter-cell bus bar 160, a total positive terminal bus bar 164, and a total negative terminal bus bar 165 on the front surface of the battery module. The cell-to-cell bus bar 160, the total positive terminal bus bar 164, and the total negative terminal bus bar 165 are also collectively referred to as a bus bar. The bus bar is electrically connected to the electrode terminal of the battery cell 150. The bus bar may be welded to the electrode terminals of the battery cell 150. The bus bar may be electrically connected to the electrode terminal of the battery cell 150 by another method such as crimping.

While the battery cell 150 is held in the cell holder 120, a bus bar may be welded to the electrode terminal of the battery cell 150. When the electrode terminal and the bus bar are welded, high accuracy may be required for the positional relationship between the electrode terminal and the bus bar. In this case, by improving the accuracy of the application position of the adhesive that adheres the battery cell 150 and the cell holder 120, welding between the electrode terminal and the bus bar can be facilitated. Further, the productivity of the battery module can be improved by adhering the battery cell 150 and the cell holder 120 before the bus bar is welded to the battery cell 150.

As shown in FIG. 4, the cell-to-cell bus bar 160 includes a convex portion 161, a terminal connection portion 162, and a sensor mounting terminal 163. The cell-to-cell bus bar 160 may be made of a conductive metal such as copper or aluminum.

The convex portion 161 of the cell-to-cell bus bar 160 is provided to avoid contact with a structure such as a rib provided on the cell holder 120. The terminal connection portion 162 is electrically connected to the electrode terminal of the battery cell 150. The convex portion 161 is located between the two terminal connecting portions 162. When the inter-cell bus bar 160 is viewed facing the X-axis direction, the convex portion 161 protrudes in the negative direction of the Y-axis from the two terminal connecting portions 162.

The terminal connection portion 162 has a welding opening 162a. The terminal connection portion 162 is electrically connected to each electrode terminal of the battery cell 150 at the peripheral edge portion of the welding opening 162a by welding such as bead welding.

The sensor mounting terminal 163 is a terminal on which the sensor board 450 (see FIG. 2) is mounted. The sensor mounting terminal 163 has a nut 163a. The sensor board 450 is attached to the sensor mounting terminal 163 by, for example, a bolt screwed to the nut 163a. The sensor substrate 450 is electrically connected to the electrode terminals of each battery cell 150.

As shown in FIG. 5, the cell-to-cell bus bar 160 includes cell-to-cell bus bars 160-1 to 160-1 to 4. The cell-to-cell bus bars 160-1 to 160 electrically connect the positive electrode terminal 152 of the battery cell 150 and the negative electrode terminal 153 of another battery cell 150. The cell-to-cell bus bar 160-1 electrically connects the positive electrode terminal 152 of the battery cell 150-1 and the negative electrode terminal 153 of the battery cell 150-2. The cell-to-cell bus bar 160-2 electrically connects the positive electrode terminal 152 of the battery cell 150-2 and the negative electrode terminal 153 of the battery cell 150-3. The cell-to-cell bus bar 160-3 electrically connects the positive electrode terminal 152 of the battery cell 150-3 and the negative electrode terminal 153 of the battery cell 150-4. The cell-to-cell bus bar 160-4 electrically connects the positive electrode terminal 152 of the battery cell 150-4 and the negative electrode terminal 153 of the battery cell 150-5. The total positive terminal bus bar 164 is electrically connected to the positive electrode terminal 152 of the battery cell 150-5. The total negative terminal bus bar 165 is electrically connected to the negative electrode terminal 153 of the battery cell 150-1. The bus bar connects the battery cells 150 in series between the total positive terminal bus bar 164 and the total negative terminal bus bar 165.

As shown in FIG. 5, the cell holder 120 has a wall portion 122 projecting to the front side. The cell holder 120 has a positioning portion 128 that defines the position of the sensor board 450 (see FIG. 6) in the Y-axis direction and a guide portion 126 that defines the position of the sensor board 450 in the Z-axis direction inside the wall portion 122. Have. The cell holder 120 has a convex portion 124 protruding from the wall portion 122 along the X-axis. The convex portion 124 is fixed by the convex portion 304 (see FIG. 8) of the upper case 300 and the clip 310 (see FIG. 2).

As shown in FIG. 5, the assembled battery 100 includes a safety valve cover 410 and a seal 420 on the front surface of the battery module. The safety valve cover 410 is provided on the front surface of the cell holder 120 with the seal 420 sandwiched between the safety valve cover 410 and the cell holder 120. The safety valve cover 410 covers the safety valve 154 located on the cap surface 151 of the battery cell 150. The safety valve cover 410 may be made of a resin such as PBT. The seal 420 may be made of rubber such as EPDM (Ethylene-Propylene-Diene Monomer), for example. The safety valve cover 410 has a fastening portion 414, and is attached to the cell holder 120 by a fastening member 416 (see FIG. 2) at the fastening portion 414. The fastening member 416 may be, for example, a screw or the like. The safety valve cover 410 may be attached to the cell holder 120 by fitting with a claw or the like.

The safety valve cover 410 is commonly attached to the safety valve 154 of the battery cells 150-1 to 3 stacked in three stages and the safety valve 154 of the battery cells 150-4 to 5 stacked in two stages, respectively. The seal 420 has an opening 422 at a position corresponding to the safety valve 154.

The safety valve cover 410 has a gas duct 412 for passing the gas discharged from the safety valve 154. The gas duct 412 is also simply referred to as a duct. The gas duct 412 projects from the safety valve cover 410 toward the front surface of the assembled battery 100. The gas duct 412 is connected to the gas discharge pipe 500 (see FIG. 1). The gas discharged from the safety valve 154 passes through the gas duct 412 and the gas discharge pipe 500, and is discharged to the outside of the assembled battery 100. When the assembled battery 100 is mounted on a vehicle, the gas discharge pipe 500 discharges gas to, for example, an external space under the vehicle body. The safety valve cover 410, the seal 420, the gas duct 412, and the gas discharge pipe 500 form a gas discharge path.

By connecting the safety valve cover 410 to the gas discharge pipe 500, gas is less likely to leak around the assembled battery 100. When the assembled battery 100 is mounted on a vehicle, the gas discharge path is connected to the outside of the vehicle, so that the gas is discharged to the outside of the vehicle and is less likely to leak into the vehicle. That is, the gas can be safely discharged.

As shown in FIG. 6, the assembled battery 100 includes a sensor substrate 450 and a BAT case 130 on the front surface of the battery module.

The sensor board 450 is attached to the sensor mounting terminal 163 of the bus bar, which is electrically connected to the electrode terminal of the battery cell 150, by the mounting member 451. The mounting member 451 may be, for example, a screw or the like. The sensor substrate 450 can measure at least one of the current flowing between the electrode terminals of each battery cell 150 and the voltage between the electrode terminals. The sensor board 450 may include a circuit that functions as a BMS (Battery Management System).

The BAT case 130 has an opening 132 for exposing the gas duct 412 to the front surface. The BAT case 130 has a holding portion 134 for holding the gas discharge pipe 500 (FIGS. 1 and 2). The BAT case 130 is fitted inside the wall portion 122 of the cell holder 120. A nut 460 is provided between the bottom surface side of the wall portion 122 of the cell holder 120 and the BAT case 130. The nut 460 receives bolts or the like when the assembled battery 100 is fixed by bolts or the like from the bottom surface side.

As shown in FIG. 6, the bus bar and the electrode terminals of the battery cell 150 are located in a space surrounded by the wall portion 122 protruding from the cell holder 120 to the front side and the BAT case 130. Since the wall portion 122 projects to the front side, the impact that the assembled battery 100 receives from the front side can be mitigated. Since the wall portion 122 and the BAT case 130 surround the bus bar and the electrode terminals, water or dust is less likely to enter the positions of the bus bar and the electrode terminals. That is, the wall portion 122 and the BAT case 130 can protect the bus bar and the electrode terminals from water, dust, impact, or the like. The BAT case 130 covers the front side of the wall portion 122. The BAT case 130 is also referred to as a cover.

As shown in FIG. 5, the lower case 110 includes a relay support portion 114 and a relay surrounding portion 116 on the upper surface thereof. The relay 220 (see FIG. 6) is provided in a space surrounded by the relay support portion 114 and the relay surrounding portion 116.

As shown in FIGS. 6 and 7, the assembled battery 100 includes a relay 220 and vibration-proof members 222 and 224 on the upper surface of the battery module. Two relays 220 are provided. The two relays 220 are distinguished as relay 220a and relay 220b, respectively. The number of relays 220 is not limited to two, and may be one or three or more. The anti-vibration members 222 and 224 may be made of a material such as urethane. The anti-vibration member 222 is located on the bottom surface side of the relay 220. The anti-vibration member 224 is located on the upper surface side of the relay 220. That is, the relay 220 is surrounded by anti-vibration members 222 and 224. Since the anti-vibration members 222 and 224 surround the relay 220, it becomes difficult for the vibration caused by the operation of the relay 220 to be transmitted to the battery module.

The assembled battery 100 includes copper bus bars 230, 231, 232, 233 and 234 and a fuse 236 on the upper surface of the battery module. The copper bus bar 230 electrically connects the total negative terminal bus bar 165 and the external negative electrode terminal 270. The copper bus bar 231 electrically connects the total positive terminal bus bar 164 and one end of the relay 220a. The copper bus bar 232 electrically connects the other end of the relay 220a and one end of the relay 220b. The copper bus bar 233 electrically connects the other end of the relay 220b to one end of the fuse 236. The copper bus bar 234 electrically connects the other end of the fuse 236 to the external positive electrode terminal 250. That is, two relays 220 and a fuse 236 are connected in series between the total positive terminal bus bar 164 and the external positive electrode terminal 250. The copper bus bars 230, 231, 232, 233 and 234 and the fuse 236 are fastened to the upper surface of the battery module by the fastening member 238. The fastening member 238 may be, for example, a screw or the like.

The external positive electrode terminal 250 and one end of the copper bus bar 234 are attached to the upper surface of the battery module via the packing 252. The external negative electrode terminal 270 and one end of the copper bus bar 230 are attached to the upper surface of the battery module via the packing 272. The packings 252 and 272 may be made of rubber such as EPDM. The packings 252 and 272 seal the space between the recesses 301 and 302 (FIG. 1) of the upper case 300 to prevent water, dust, or the like from entering the inside of the assembled battery 100.

As shown in FIG. 7, the gas discharge pipe 500 includes a first tube 510, a second tube 520, a third tube 530, a joint 540, and a grommet 550. The first tube 510 and the second tube 520 are connected to the gas duct 412 at one end. That is, the gas discharge pipe 500 is connected to the battery module at at least two places. The first tube 510 and the second tube 520 are connected to the joint 540 at the other end. The third tube 530 is connected to the joint 540 at one end and projects to the outside such as under the floor of the vehicle at the other end. The third tube 530 penetrates the grommet 550 located at the boundary between the outside such as under the floor of the vehicle and the inside of the vehicle. The grommet 550 can prevent the intrusion of water, dust, etc. from the outside of the vehicle. Each part of the gas discharge pipe 500 may be made of, for example, resin or rubber. Since each part of the gas discharge pipe 500 is made of resin, rubber, or the like, the gas discharge pipe 500 can be made lighter and can be easily handled in work such as assembly.

The joint 540 is a cross joint, but is not limited to this, and may be a three-way joint. The three connection ports of the joint 540 connect to the first tube 510, the second tube 520, and the third tube 530, respectively. If the joint 540 is a cross joint, one of the four connection openings will be closed. The joint 540 is held in the Z-axis direction and the X-axis direction by the holding portion 134 protruding from the BAT case 130. The first tube 510 is held in the Z-axis direction by the holding portion 134. The third tube 530 bends in the negative direction of the Y axis at a position closer to the bottom surface than the lower end of the upper case 300, and protrudes to the outside of the assembled battery 100.

As shown in FIG. 8, the assembled battery 100 includes an upper case 300 that covers the battery module from the upper surface. The upper case 300 is inserted into the battery module from the positive direction to the negative direction of the Z axis. The upper case 300 has a convex portion 304 on the first side surface, the second side surface, and the back surface. The convex portion 304 is fixed by the convex portion 124 protruding from the first side surface and the second side surface of the cell holder 120 and the clip 310. The convex portion 304 is fixed to the convex portion protruding from the back surface of the lower case 110 by a clip 310.

As shown in FIG. 1, the gas discharge pipe 500 projects toward the front side on the bottom side. That is, the gas discharge pipe 500 communicates the inside and the outside of the BAT case 130. By doing so, it is possible to achieve both protection of the bus bar and the electrode terminals and emission of gas.

As shown in FIGS. 8 and 9, the BAT case 130 includes a guide portion 136 on the front side. The guide portion 136 extends in the direction in which the upper case 300 is inserted into the battery module. That is, the guide portion 136 extends in the Z-axis direction.

The guide portion 136 has a rib 137 protruding in the X-axis direction. It can be said that the rib 137 intersects the guide portion 136. The guide portion 136 has higher rigidity than the case without the rib 137 by having the rib 137 intersecting with itself.

The guide portion 136 has a tapered portion 138 on the side where the upper case 300 is inserted into the battery module. That is, the guide portion 136 has the tapered portion 138 on the positive direction side of the Z axis. The tapered portion 138 has a shape that protrudes toward the negative direction of the Y axis toward the negative direction of the Z axis. That is, the tapered portion 138 has a shape that protrudes toward the front surface from the upper surface to the bottom surface.

As shown in FIG. 10, the upper case 300 has an end 320 on the bottom side. When the upper case 300 is inserted into the battery module, the end 320 may come into contact with the guide 136. When the guide portion 136 has the tapered portion 138, the end portion 320 comes into contact with the tapered portion 138. The end portion 320 is inserted into the battery module while being in contact with the tapered portion 138, so that the end portion 320 is less likely to be caught by the guide portion 136. That is, the end 320 can be smoothly inserted. Even when the end portion 320 comes into contact with the guide portion 136, the guide portion 136 is less likely to be distorted by having the rib 137.

The holding portion 134 projects from the BAT case 130 to the front side. The end portion of the guide portion 136 protrudes toward the front surface from the end portion of the holding portion 134. The difference between the length of the guide portion 136 protruding and the length of the holding portion 134 protruding is represented by D1. Since the guide portion 136 protrudes from the holding portion 134, the upper case 300 is less likely to hit the gas duct 412 and the gas discharge pipe 500 when inserted into the battery module. When the upper case 300 is formed by injection molding of resin or the like, even if the shape of the upper case 300 is distorted due to warpage or the like, the guide portion 136 causes the upper case 300 to discharge the gas duct 412 and gas. Make it difficult to hit the tube 500. Further, when the assembly worker inserts the upper case 300 into the battery module, the upper case 300 covers the battery module, which makes it difficult for the worker to see the gas duct 412 and the gas discharge pipe 500. Even if the operator cannot see the gas duct 412 and the gas discharge pipe 500, the guide portion 136 makes the upper case 300 difficult to hit the gas duct 412 and the gas discharge pipe 500. As a result, assembly is easy.

As shown in FIG. 10, the BAT case 130 has a stopper 135 projecting to the front side. The end portion of the stopper 135 protrudes toward the front surface from the end portion of the guide portion 136. The difference between the length of the stopper 135 protruding and the length of the guide portion 136 protruding is represented by D2. Since the stopper 135 protrudes from the guide portion 136, the end portion 320 of the upper case 300 comes into contact with the upper surface of the stopper 135 when the upper case 300 is inserted into the battery module. As shown in FIG. 8, the gas discharge pipe 500 projects toward the front surface on the lower surface side of the stopper 135. When the end portion 320 comes into contact with the upper surface of the stopper 135, the upper case 300 is less likely to hit the gas discharge pipe 500 projecting to the front surface side. As a result, assembly is easy.

The guide portion 136 may be located between the points where the gas discharge pipe 500 is connected to the battery module. That is, the guide portion 136 may be located between the gas ducts 412. By doing so, one guide portion 136 can protect the connection point of the gas discharge pipe 500 located on both side surface sides of the guide portion 136 from the upper case 300.

The distance between the guide portion 136 and the gas discharge pipe 500 may be shorter than the distance between the stopper 135 and the gas discharge pipe 500. Further, the position of the guide portion 136 in the Z-axis direction may be close to the position of the gas duct 412 in the Z-axis direction. By doing so, the guide portion 136 can easily protect the gas duct 412 and the gas discharge pipe 500 from the upper case 300.

When the upper case 300 is inserted into the battery module, it becomes difficult for the gas discharge pipe 500 to come into contact with the gas duct 412 and the gas discharge pipe 500, so that the gas discharge pipe 500 does not easily come out of the gas duct 412. For example, when the assembled battery 100 is mounted on a vehicle, the gas discharge pipe 500 is difficult to be removed from the gas duct 412 even if vibration or impact due to the running of the vehicle is applied to the connection point between the gas discharge pipe 500 and the gas duct 412. .. As a result, safety in gas emissions can be improved.

As shown in FIG. 11, the gas duct 412 may have a recess 418. The inner surface of the first tube 510 comes into contact with the uneven surface including the recess 418. The recess 418 may have a gentle slope along the positive direction of the Z axis so that the frictional force when the first tube 510 is inserted is small. On the other hand, the recess 418 may have a steep slope along the negative direction of the Z axis so that the frictional force when the first tube 510 comes out is large. That is, the recess 418 may have a bamboo shoot shape. The recess 418 may have a saw-like shape or the like in a cross-sectional view. Since the recess 418 has a bamboo shoot shape, the first tube 510 is easily inserted into the gas duct 412 and is difficult to be pulled out from the gas duct 412. Since the first tube 510 is easily inserted into the gas duct 412, the gas discharge pipe 500 can be easily attached. By making it difficult for the first tube 510 to come out of the gas duct 412, safety in gas discharge can be improved. In FIG. 11, the first tube 510 can be replaced by the second tube 520.

The first tube 510 may be tightened by the tightening member 514 at the portion inserted into the gas duct 412. The tightening member 514 may be a band, a clamp, or the like. By tightening the first tube 510 with the tightening member 514, it becomes difficult for the first tube 510 to come out of the gas duct 412. As a result, safety in gas emissions can be improved.

As shown in FIG. 12, the first tube 510 may have a convex portion 512 on the inner surface corresponding to the concave portion 418 of the gas duct 412. The convex portion 512 may have a shape such as a hook shape in a cross-sectional view. The convex portion 512 of the first tube 510 fits with the concave portion 418 of the gas duct 412. That is, the convex portion 512 and the concave portion 418 are fitted to each other. The convex portion 512 and the concave portion 418 are also referred to as fitting portions, respectively. By fitting the fitting portion of the first tube 510 and the fitting portion of the gas duct 412 to each other, the first tube 510 is less likely to come off from the gas duct 412. As a result, safety in gas emissions can be improved. In FIG. 12, the first tube 510 can be replaced by the second tube 520.

As shown in FIG. 10 and the like, the first tube 510 is inserted into the gas duct 412 from the bottom surface side. The gas duct 412 may have a structure in which the first tube 510 is inserted from the upper surface side. That is, the tip of the gas duct 412 may face the upper surface side. When the first tube 510 is inserted into the gas duct 412 from the upper surface side, the insertion direction of the first tube 510 and the direction in which the upper case 300 is inserted into the battery module are the same. By doing so, when the upper case 300 is inserted into the battery module, even if the upper case 300 hits the gas discharge pipe 500, the first tube 510 is less likely to come out of the gas duct 412. As a result, safety in gas emissions can be improved.

Although one embodiment according to the present disclosure has been described based on the drawings and examples, it should be noted that those skilled in the art can easily make various modifications or modifications based on the present disclosure. It should be noted, therefore, that these modifications or modifications are within the scope of this disclosure. For example, the functions and the like included in each means can be rearranged so as not to be logically inconsistent, and a plurality of means and the like can be combined or divided into one.

100 sets Battery 110 Lower case 112 Fastening member 114 Relay support part 116 Relay surrounding part 120 Cell holder 122 Wall part 124 Convex part 126 Guide part 128 Positioning part 130 BAT case 132 Opening 134 Holding part 135 Stopper 136 Guide part 137 Rib 138 Tapered part 150 Battery cell 151 Cap surface 152 Positive terminal 153 Negative terminal 154 Safety valve 155 Insulation sheet 160 Cell-to-cell bus bar 161 Convex part 162 Terminal connection part 162a Welding opening 163 Sensor mounting terminal 163a Nut 164 Total positive terminal Bus bar 165 Total negative terminal Bus bar 220a , 220b) Relay 222, 224 Anti-vibration member 230, 231, 232, 233, 234 Copper bus bar 236 Fuse 238 Fastening member 250 External positive electrode terminal 252 Packing 270 External negative electrode terminal 272 Packing 300 Upper case 301, 302 Concave part 304 Convex part 310 clip 320 End 410 Safety valve cover 412 Gas duct 414 Fastener 416 Fastening member 418 Recessed 420 Seal 422 Opening 450 Sensor board 451 Mounting member 460 Nut 500 Gas discharge pipe 510, 520, 530 1st tube, 2nd tube, 3rd tube 512 Convex Part 514 Tightening member 540 Joint 550 Glomet

Claims (10)

A battery module having a battery cell and a gas discharge pipe for discharging gas generated in the battery cell, and
A case for covering the battery module is provided.
The battery module further has a guide portion that protrudes in front of the position of the gas discharge pipe in the direction in which the case is inserted into the battery module .
The gas discharge pipe is connected to the battery module at at least two places.
The guide portion is located between the points where the gas discharge pipe is connected to the battery module.
Batteries assembled. The assembled battery according to claim 1, wherein the guide portion has a tapered portion on the side into which the case is inserted. The battery module further has a stopper that comes into contact with the end of the case.
The assembled battery according to claim 1 or 2, wherein the distance between the guide portion and the gas discharge pipe is shorter than the distance between the stopper and the gas discharge pipe. The assembled battery according to any one of claims 1 to 3 , wherein the guide portion extends in a direction in which the case is attached to the battery module, and further has ribs intersecting the guide portion. The battery module includes a holder for holding the battery cell, a bus bar connected to an electrode terminal of the battery cell, and a cover covering the bus bar.
The holder has a wall portion that protrudes from the bus bar and to which the cover is attached.
The assembled battery according to any one of claims 1 to 4 , wherein the gas discharge pipe communicates between the inside and the outside of the cover. The assembled battery according to any one of claims 1 to 5 , further comprising a duct connected to the gas discharge pipe. The assembled battery according to claim 6 , wherein the duct has a bamboo shoot shape. The assembled battery according to claim 6 or 7 , wherein the gas discharge pipe is fastened to the duct by a tightening member. The duct and the gas discharge pipe each have a fitting portion and have a fitting portion.
The assembled battery according to any one of claims 6 to 8 , wherein the fitting portion of the duct and the fitting portion of the gas discharge pipe are fitted to each other. The assembled battery according to any one of claims 6 to 9 , wherein the gas discharge pipe is inserted into the duct in the same direction in which the case is inserted into the battery module.

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