Equipment module

Abstract

To provide an equipment module that can efficiently dissipate heat from a relay body to a heat transfer component.SOLUTION: An equipment module includes a relay 100 having a relay body 140 including a fixed terminal 160 and a movable terminal 170, and a drive unit 120. The fixed terminal is electrically connected to a current path. The movable terminal contacts and separates from the fixed terminal. The drive unit displaces the movable terminal to switch between energization and cutoff with respect to the fixed terminal. The relay includes a heat transfer member 180 and a housing 190. The heat transfer member forms a part of the current path and transfers heat. The housing includes a first wall 191 on which the fixed terminal is provided, and second walls 193, 197 different from the first wall. A first extension 181 that is a part of the heat transfer member is connected to the fixed terminal. A second extension 182 that is the remainder of the heat transfer member extends along the second wall and is fixed to the second wall.SELECTED DRAWING: Figure 3

Description

Technical Field

[0001] The disclosure described in this specification relates to a device module.

Background Art

[0002] The electrical unit of Patent Document 1 has a relay, a cooling member, a first bus bar, a second bus bar, and a housing. The relay is housed in the housing. The relay is electrically connected to the first bus bar and the second bus bar. The cooling member includes a recess that partially receives the first bus bar and the second bus bar.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The cooling member of Patent Document 1 extends long so as to cross the side of the housing. The housing has a flange that extends away from the main body. An attachment member extends from the flange toward the cooling member. The cooling member is fixed to the flange via the attachment member. In Patent Document 1, since the heat of the relay is transferred to the cooling member via the flange and the attachment member, the cooling member could not dissipate heat efficiently.

[0005] An object of the present disclosure is to provide a device module capable of efficiently dissipating the heat of the relay body to a heat transfer member.

Means for Solving the Problems

[0006] A device module according to an aspect of the present disclosure is A device module (10) comprising a relay (100) having a relay body (140) including a fixed terminal (160) electrically connected to a current path (15, 16, 17) and a movable terminal (170) that contacts and separates from the fixed terminal, and a drive unit (120) that displaces the movable terminal to switch between energization and interruption with the fixed terminal. The relay further includes a heat transfer member (180) that forms part of the current path and transfers heat, and a housing (190) that houses the fixed terminal, the movable terminal, and the drive unit. The housing has a first wall (191) provided with the fixed terminal, and a second wall (193, 197) different from the first wall. A first extension portion (181) that is part of the heat transfer member is connected to the fixed terminal, and a second extension portion (182) that is the remainder of the heat transfer member extends along the second wall and is fixed to the second wall.

[0007] According to this, the heat of the relay body (140) can be efficiently dissipated to the heat transfer member (180).

[0008] Note that the reference numerals in the parentheses above merely indicate the correspondence with the configurations described in the embodiments below, and do not limit the technical scope in any way.

Brief Description of the Drawings

[0009]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Figure 9

Figure 10

Figure 11

Figure 12

Figure 13

Modes for Carrying Out the Invention

[0010] Hereinafter, a plurality of modes for carrying out the present disclosure will be described with reference to the drawings. In each mode, the same reference numerals may be given to the parts corresponding to those described in the preceding mode, and redundant descriptions may be omitted. When only a part of the configuration is described in each mode, other modes described previously can be applied to the other parts of the configuration.

[0011] In addition, not only the combinations of the parts clearly shown to be combinable in each embodiment, but also the embodiments themselves, the embodiments and the modification examples, and the modification examples themselves can be partially combined as long as there is no problem with the combination, even if not explicitly stated.

[0012] (First Embodiment) The high-voltage junction box (hereinafter referred to as high-voltage J / B) 10 according to the first embodiment of FIG. 1 is used in an electric vehicle such as a BEV (Battery Electric Vehicle). The high-voltage J / B 10 is mounted on an electric vehicle together with a battery device 2, an inverter 3, a charging inlet 4, and the like. The high-voltage J / B 10 is electrically connected to the battery device 2, the inverter 3, the charging inlet 4, and the like. The high-voltage J / B 10 may be referred to as a device module. The battery device 2 may be referred to as a power supply device.

[0013] The battery device 2 is a power storage device that stores electric power for driving the electric vehicle. The battery device 2 includes a rechargeable secondary battery such as a lithium-ion battery or a nickel-metal hydride battery. The inverter 3 is electrically connected to a motor generator for driving. The inverter 3 controls the rotational speed and torque of the motor generator. A charging cable of a charging stand provided outside the vehicle is connected to the charging inlet 4. DC power for rapidly charging the battery ES is applied to the charging inlet 4. The charging inlet 4 supplies the DC power input from the charging stand to the high-voltage J / B 10.

[0014] The high-voltage J / B 10 includes a power control circuit 70, a fixing base 80 for fixing the power control circuit 70, and a heat dissipation sheet 90. The power control circuit 70 includes a plurality of current paths. The power control circuit 70 switches the plurality of current paths. As current paths, the power control circuit 70 includes a pair of battery connection lines 15P, 15N, inverter connection lines 16P, 16N, and charging lines 17P, 17N, respectively. In addition, the power control circuit 70 includes two system main relays 1P, 1N and two DC charging relays 2P, 2N. Note that elements with the symbol "P" attached are positive electrode side configurations. Elements with the symbol "N" attached are negative electrode side (ground side) configurations.

[0015] The battery connection lines 15P, 15N, the inverter connection lines 16P, 16N, and the charging lines 17P, 17N are formed by a copper plate member such as a bus bar. The battery connection lines 15P, 15N, the inverter connection lines 16P, 16N, and the charging lines 17P, 17N are capable of conducting a large current. These form a plurality of current paths in the power control circuit 70. The battery connection lines 15P, 15N are current paths electrically connected to the battery device 2. The inverter connection lines 16P, 16N are current paths electrically connected to the inverter 3. The charging lines 17P, 17N are current paths electrically connected to the charging inlet 4. Electric power for charging the battery device 2 is supplied to the charging lines 17P, 17N. The battery connection lines 15P, 15N, the inverter connection lines 16P, 16N, and the charging lines 17P, 17N may be collectively referred to as wirings 15, 16, 17. The wirings 15, 16, 17 are formed by a copper plate member such as a bus bar.

[0016] The system main relay 1P is located between the battery connection line 15P and the inverter connection line 16P. The system main relay 1N is located between the battery connection line 15N and the inverter connection line 16N. The system main relays 1P, 1N switch the state of the current path between the battery device 2 and the inverter 3 between an energized state (on) and a non-energized state (off).

[0017] The DC charging relay 2P is located between the system main relay 1P and the charging line 17P. The DC charging relay 2P is connected in series with the system main relay 1P. The DC charging relay 2N is located between the system main relay 1N and the charging line 17N. The DC charging relay 2N is connected in series with the system main relay 1N. The DC charging relays 2P, 2N switch the state of the current path between the battery device 2 and the charging inlet 4 between an energized state (on) and a non-energized state (off).

[0018] The operations of the system main relays 1P, 1N and the DC charging relays 2P, 2N are individually controlled by a control device mounted on the vehicle. The control device is an in-vehicle ECU (Electronic Control Unit). The control device includes an arithmetic processing circuit including a processor, a RAM (Random Access Memory), and a storage, etc. The control device outputs a control signal for controlling the on and off switching to each of the system main relays 1P, 1N and the DC charging relays 2P, 2N.

[0019] The power control circuit 70 includes two relays 100 and wirings 15, 16, 17. One relay 100 has a configuration in which the system main relay 1P on the positive electrode side and the DC charging relay 2P are integrated. The other relay 100 has a configuration in which the system main relay 1N on the negative electrode side and the DC charging relay 2N are integrated. The relay 100 switches a plurality of wirings 15, 16, 17 according to a control signal obtained from the control device. A DC large current of several tens to several hundreds of amperes flows through these wirings 15, 16, 17.

[0020] <Configuration of the high voltage J / B> Next, the configuration of the high voltage J / B 10 will be described based on FIGS. 2 and 3. In each drawing, the components of the high voltage J / B 10 are schematically shown. In the following, three directions orthogonal to each other are shown as the X direction, the Y direction, and the Z direction. In the drawings, the description of "direction" is omitted and simply described as X, Y, and Z. The high voltage J / B 10 is provided on the vehicle body. As an example, the high voltage J / B 10 is arranged under the floor of the passenger compartment.

[0021] The high-voltage J / B10 has a relay 100, wirings 15, 16, 17, a fixing base 80, and a heat dissipation sheet 90. The fixing base 80 is substantially rectangular parallelepiped-shaped. The fixing base 80 has a mounting surface 81 on which the relay 100 and the wirings 15, 16, 17 are mounted, and a placement surface on the back side thereof. The heat dissipation sheet 90 is provided on the mounting surface 81. The relay 100 is mounted on the mounting surface 81 via the heat dissipation sheet 90. The heat dissipation sheet 90 is a member for reducing the thermal resistance between the relay 100 and the fixing base 80. The heat dissipation sheet 90 can adopt a heat dissipation gel or the like. Also, the heat dissipation sheet 90 may be referred to as a thermal interface material.

[0022] The direction in which the relay 100 and the fixing base 80 are arranged corresponds to the Z direction. The relay 100 is fixed to the fixing base 80 in the Z direction. The mounting surface 81 and the placement surface are arranged apart from each other in the Z direction. The placement surface is a surface facing the floor of the vehicle compartment. By fixing the placement surface to the floor of the vehicle compartment, the high-voltage J / B10 is fixed to the vehicle. The fixing base 80 is mainly composed of an insulating resin.

[0023] <Configuration of Relay> FIG. 4 is a schematic diagram of the relay 100. FIG. 5 is a cross-sectional view of the relay 100. The relay 100 is composed of an electromagnetic actuator 120, a relay body 140, a housing 190, etc. The electromagnetic actuator 120 and the relay body 140 are housed in the housing 190. Note that the electromagnetic actuator 120 may be referred to as a drive unit. The reciprocating operation direction of the electromagnetic actuator 120 in the relay 100 corresponds to the axial direction of a rod 129 described later. The Y direction is defined along the reciprocating operation direction of the electromagnetic actuator 120. The arrangement direction in which a first storage chamber 190A and a second storage chamber 190B described later are arranged corresponds to the Y direction. The direction orthogonal to the axis along the Y direction may be referred to as the orthogonal direction. Note that the axial direction of the rod 129 can be paraphrased as the extending direction of the rod 129.

[0024] The electromagnetic actuator 120 is arranged axially parallel to the relay body 140. For convenience, the side of the relay body 140 with respect to the electromagnetic actuator 120 is defined as the upward direction, and the side of the electromagnetic actuator 120 with respect to the relay body 140 is defined as the downward direction. The electromagnetic actuator 120 is mechanically connected to the relay body 140. The electromagnetic actuator 120 supplies a driving force for switching operation to the relay body 140.

[0025] The electromagnetic actuator 120 has two actuator parts 120A and 120B that function as linear actuators. The first actuator part 120A and the second actuator part 120B can operate independently of each other. The electromagnetic actuator 120 is composed of a fixed core 121, a movable core 126, a rod 129, an exciting coil 130, a coil housing 132, a return spring 133, a damper seat 135, a housing cylinder 136, etc. Among these components, the movable core 126, the rod 129, the exciting coil 130, the coil housing 132, the return spring 133, the damper seat 135, and the housing cylinder 136 are provided one by one for each actuator part 120A, 120B.

[0026] The fixed core 121 is formed of a magnetic material such as iron. The fixed core 121 has a base part 122 and two cylinder parts 123. The base part 122 is formed in a thin plate shape with a small thickness in the axial direction. The fixed core 121 is arranged at a position facing the relay body 140 with the main surface of the base part 122 along the XZ plane. A through hole communicating with a spring accommodation hole 123A to be described later is formed in the base part 122.

[0027] Each cylinder part 123 is formed in a cylindrical shape. Two cylinder parts 123 are integrally connected to the main surface of the base part 122 on the side of the electromagnetic actuator 120. The two cylinder parts 123 are arranged side by side in the X direction with a gap therebetween. The cylinder part 123 is provided with a spring accommodation hole 123A and a first opposing surface 124. The spring accommodation hole 123A is a hole in which the return spring 133 is accommodated. The spring accommodation hole 123A is formed by the inner peripheral wall surface of the cylinder part 123. The spring accommodation hole 123A communicates with a through hole formed in the base part 122. The diameter of the through hole is smaller than the diameter of the spring accommodation hole 123A. The first opposing surface 124 is formed by the lower end surface of the cylinder part 123 facing downward.

[0028] The movable core 126 is formed in a cylindrical shape by a magnetic material such as iron. The outer diameter of the movable core 126 is substantially the same as or slightly smaller than the outer diameter of the cylinder part 123. The movable core 126 is arranged coaxially with the cylinder part 123 downward of the cylinder part 123. The movable core 126 is provided with a rod holding hole 127 and a second opposing surface 128. The rod holding hole 127 is a hole for holding the rod 129. The rod holding hole 127 is formed by the inner peripheral wall surface of the movable core 126. The second opposing surface 128 is formed by the upper end surface of the movable core 126 facing upward. A gap is interposed between the second opposing surface 128 and the first opposing surface 124. The fixed core 121 and the movable core 126 face each other with the gap therebetween.

[0029] The rod 129 is formed in an elongated cylindrical shape by a non-magnetic metal material or the like. The rod 129 is inserted into the through hole of the fixed core 121 including the spring accommodation hole 123A. The lower part of the rod 129 is fitted into the rod holding hole 127. The rod 129 reciprocates in the axial direction integrally with the movable core 126. The upper part of the rod 129 passes through the spring accommodation hole 123A and protrudes upward from the base part 122. The upper part of the rod 129 is accommodated in the relay body 140.

[0030] The exciting coil 130 is formed by winding a thin wire material such as copper around a coil bobbin 131. The coil bobbin 131 is formed in a cylindrical shape or a rectangular cylindrical shape by a resin material. The exciting coil 130 is arranged so as to surround the outer peripheral sides of the cylinder portion 123 and the movable core 126. The exciting coil 130 is energized according to a control signal output from a control device. When the exciting coil 130 is excited by energization, it generates a magnetic flux along the axial direction on the inner peripheral side.

[0031] The coil housing 132 is formed in a bottomed container shape from a magnetic material such as stainless steel having ferromagnetism. The coil housing 132 is arranged downward of the base portion 122. The upper edge of the coil housing 132 is in contact with the outer edge of the base portion 122. The exciting coil 130 is housed inside the coil housing 132.

[0032] The return spring 133 is formed by spirally winding a metal wire. The return spring 133 is arranged on the outer periphery of the rod 129. The return spring 133 is housed in the spring housing hole 123A in a state of being axially compressed between the cylinder portion 123 and the movable core 126. The return spring 133 biases the movable core 126 axially in a direction away from the cylinder portion 123 by a restoring force.

[0033] The damper seat 135 is formed in a thin disc shape from a rubber material, a resin material, or the like. The damper seat 135 is arranged downward of the movable core 126. The damper seat 135 contacts the lower end surface of the movable core 126 facing downward and restricts the movement of the movable core 126 in a direction away from the cylinder portion 123.

[0034] The housing cylinder 136 is described as a bottomed cylinder made of a metallic material. The housing cylinder 136 houses the movable core 126 and the damper seat 135. The upper edge of the peripheral wall of the housing cylinder 136 is externally fitted to the outer peripheral wall surface of the cylinder portion 123. The inner peripheral wall surface of the housing cylinder 136 slidably supports the outer peripheral wall surface of the movable core 126. The movable core 126 is reciprocally displaceable along the axial direction within the housing cylinder 136.

[0035] A magnetic circuit is formed in the electromagnetic actuator 120. The magnetic circuit efficiently passes the generated magnetic flux of the exciting coil 130. The magnetic circuit is formed by the fixed core 121, the movable core 126, the coil housing 132, and the housing cylinder 136 so as to surround the periphery of the exciting coil 130. When the exciting coil 130 is energized and magnetic flux is generated in the magnetic circuit, the movable core 126 is attracted to the fixed core 121 by magnetic force. It moves upward so as to reduce the gap between the fixed core 121 and the movable core 126. When the energization of the exciting coil 130 is stopped and the magnetic flux generated in the magnetic circuit disappears, the movable core 126 moves downward by the biasing force of the return spring 133. By providing two magnetically independent magnetic circuits and the exciting coil 130 in the electromagnetic actuator 120, the first actuator portion 120A and the second actuator portion 120B can reciprocate individually.

[0036] The relay body 140 has two relay portions 140A and 140B that switch between allowing and blocking energization between the fixed terminal 160 and the movable terminal 170. For convenience, the relay portion mechanically connected to the first actuator portion 120A is taken as the first relay portion 140A. Also, the relay portion mechanically connected to the second actuator portion 120B is taken as the second relay portion 140B. The first relay portion 140A and the second relay portion 140B can switch between allowing and blocking energization independently of each other. Specifically, even when the first relay portion 140A allows energization, the second relay portion 140B can block energization. Similarly, even when the first relay portion 140A blocks energization, the second relay portion 140B can allow energization.

[0037] The relay body 140 is composed of a pressing spring 145, a pressing plate 146, a spring holder 147, a mover stopper 148, a sealed case 150, fixed terminals 160, movable terminals 170, etc. Among these components, the pressing spring 145, the pressing plate 146, the spring holder 147, the mover stopper 148, the fixed terminals 160, and the movable terminals 170 are each provided in one of the relay portions 140A and 140B. The pressing spring 145, the pressing plate 146, the spring holder 147, the movable terminal 170, and the mover stopper 148 are attached to the upper portion of the rod 129 protruding from the electromagnetic actuator 120.

[0038] The pressing spring 145 is formed by spirally winding a metal wire. The pressing spring 145 is disposed on the outer peripheral side of the rod 129. The pressing spring 145 is disposed between the pressing plate 146 and the spring holder 147. The pressing spring 145 is compressed between the pressing plate 146 and the spring holder 147 by the upward displacement of the rod 129. The restoring force of the pressing spring 145 becomes a biasing force for pressing the movable terminal 170 against the fixed terminal 160.

[0039] The pressing plate 146 is formed in a plate shape from a metal material or the like. The pressing plate 146 is disposed between the pressing spring 145 and the movable terminal 170. The pressing plate 146 is displaceable in the vertical direction with respect to the rod 129. The pressing plate 146 transmits the upward driving force of the electromagnetic actuator 120 and the upward biasing force by the pressing spring 145 to the movable terminal 170.

[0040] The spring holder 147 is formed in a flat bottomed cylindrical shape from a metal material or the like. The spring holder 147 is externally fitted onto the rod 129 and held by the rod 129. The spring holder 147 reciprocates axially integrally with the rod 129. The spring holder 147 houses the downward end portion of the compression spring 145. The spring holder 147 compresses the compression spring 145 axially due to the upward displacement of the rod 129.

[0041] The mover stopper 148 is formed in a cylindrical shape with a flange from a metal material or a hard resin material. The flange portion of the mover stopper 148 is positioned above the movable terminal 170. The mover stopper 148 reciprocates axially integrally with the rod 129. The mover stopper 148 contacts the movable terminal 170 due to the downward (return direction) displacement of the rod 129 and pushes the movable terminal 170 downward.

[0042] The sealed case 150 is formed from a ceramic material. The sealed case 150 has a bottomed container shape. The sealed case 150 is disposed above the electromagnetic actuator 120 with its opening facing downward. The sealed case 150 has an upper wall 151, side walls 152, a shielding wall 158, and a rod stopper 157.

[0043] The upper wall 151 is formed in a plate shape having a thickness in the axial direction. Three terminal accommodation holes 154, 155, 156 are formed in the upper wall 151. The terminal accommodation holes 154, 155, 156 are through holes penetrating the upper wall 151 in the plate thickness direction. The terminal accommodation holes 154, 155, 156 are formed at intervals in the X direction. The terminal accommodation holes 154, 156 are circular openings. The terminal accommodation hole 155 is an oval opening.

[0044] The shielding wall 158 is formed in a thick plate shape. The shielding wall 158 is integrated with the side wall 152. The shielding wall 158 is positioned between the two movable terminals 170 in a posture along the YZ plane. The upper end surface of the shielding wall 158 is in contact with the bottom wall surface of the shared fixed terminal 163 to be described later, or faces the bottom wall surface with a very small gap therebetween. The lower end surface of the shielding wall 158 faces the upper edges of the two housing cylinders 136 in the Y direction. The shielding wall 158 shields between the first movable terminal 171 and the second movable terminal 172.

[0045] The rod stopper 157 is formed in a plate shape from a metal material or a hard resin material. The rod stopper 157 is held by the housing 190 or the like. The rod stopper 157 is positioned above the upper end 129A of the rod 129 and faces the upper end 129A in the axial direction. The rod stopper 157 restricts the upward movement of the rod 129 by coming into contact with the upper end 129A. The housing 190 is a case body that houses the electromagnetic actuator 120 and the relay body 140. The housing 190 is formed in a box shape as a whole from a resin material or the like.

[0046] The housing 190 has an upper wall 191, a lower wall 192, side walls 193, and a fixed wall 197. The upper wall 191 may be referred to as the first wall. The side walls 193 and the fixed wall 197 may be referred to as the second walls. The lower wall 192 may be referred to as the third wall. The upper wall 191 and the lower wall 192 are spaced apart in the Y direction. The upper wall 191 and the lower wall 192 are connected via the side walls 193. The side walls 193 are continuous walls continuous with the upper wall 191 and the lower wall 192. Holes 194, 195, and 196 through which the fixed terminals 160 pass are formed in the upper wall 191. The terminal accommodation hole 154 and the hole 194 communicate with each other. The first fixed terminal 161 is passed through this communication hole. A part of the first fixed terminal 161 is exposed from the hole 194. The terminal accommodation hole 155 and the hole 195 communicate with each other. The shared fixed terminal 163 is passed through this communication hole. A part of the shared fixed terminal 163 is exposed from the hole 155. The terminal accommodation hole 156 and the hole 196 communicate with each other. The second fixed terminal 162 is passed through this communication hole. A part of the second fixed terminal 162 is exposed from the hole 196.

[0047] The lower wall 192 is provided at the lowermost end of the housing 190. A fixed wall 197 protruding from the lower wall 192 is provided on the lower wall 192. The fixed wall 197 is a part for fixing a bus bar forming a part of the inverter connection lines 16P and 16N. The bus bar forming a part of the inverter connection lines 16P and 16N electrically connects the shared fixed terminal 163 and the inverter 3. This bus bar may be referred to as an external connection bus bar 180. The external connection bus bar 180 electrically connects the shared fixed terminal 163 and the inverter 3. The relay 100 has an external connection bus bar 180 in addition to the electromagnetic actuator 120, the relay body 140, and the housing 190. The specific configuration of the external connection bus bar 180 will be described later.

[0048] An external connection bus bar 180 is fixed to the fixed wall 197 via a fastening member 198 such as a bolt. A hole 184 for passing the axis of the fastening member 198 is formed in the external connection bus bar 180. A hole 199 for passing the axis of the fastening member 198 is formed in the fixed wall 197. The external connection bus bar 180 is fixed to the fixed wall 197 by passing the axis through the two holes 184 and 199. Note that the fixing form of the external connection bus bar 180 and the housing 190 is not limited to this. Other fixing forms will be described later.

[0049] The fixed terminal 160 is formed of a metal material excellent in conductivity such as copper. The fixed terminal 160 is electrically connected to any one of the wirings 15, 16, and 17. A connection hole 165 and a fixed contact 167 are provided in the fixed terminal 160. The connection hole 165 is formed in a cylindrical hole shape. The connection hole 165 is used to fix a conductive member such as a bus bar forming the wirings 15, 16, and 17 to the fixed terminal 160. The fixed contact 167 is formed on the bottom wall surface of the fixed terminal 160 facing downward. The fixed contact 167 faces the movable terminal 170 in the axial direction. The fixed contact 167 contacts the movable terminal 170 displaced upward.

[0050] The fixed terminal 160 includes a first fixed terminal 161, a second fixed terminal 162, and a shared fixed terminal 163. These three fixed terminals 160 are electrically connected to different wirings 15, 16, and 17 respectively. The three fixed terminals 160 are arranged at intervals along the X direction by being respectively housed in the terminal accommodation holes 154, 155, and 156. The first fixed terminal 161 and the second fixed terminal 162 are located on both sides of the shared fixed terminal 163 in the X direction. The X direction is the arrangement direction in which the three fixed terminals 160 are arranged.

[0051] The first fixed terminal 161 is formed in a substantially cylindrical shape as a whole. The first fixed terminal 161 is the fixed terminal 160 included in the first relay section 140A. The first fixed terminal 161 is accommodated in the terminal accommodation hole 154. The first fixed terminal 161 is held by the upper wall 151 by being fitted into the terminal accommodation hole 154. A bus bar or the like forming a part of the battery connection lines 15P and 15N is fixed to the first fixed terminal 161.

[0052] The second fixed terminal 162 is the fixed terminal 160 having the same shape as the first fixed terminal 161. The second fixed terminal 162 is the fixed terminal 160 included in the second relay section 140B. The second fixed terminal 162 is accommodated in the terminal accommodation hole 156. The second fixed terminal 162 is held by the upper wall 151 by being fitted into the terminal accommodation hole 156. A bus bar forming a part of the charging lines 17P and 17N is fixed to the second fixed terminal 162.

[0053] The shared fixed terminal 163 is formed in an elliptical column shape as a whole. The shared fixed terminal 163 is the fixed terminal 160 larger than the first fixed terminal 161 and the second fixed terminal 162. The shared fixed terminal 163 is the fixed terminal 160 shared by the first relay section 140A and the second relay section 140B. The shared fixed terminal 163 is accommodated in the terminal accommodation hole 155. The shared fixed terminal 163 is held by the upper wall 151 by being fitted into the terminal accommodation hole 155. An external connection bus bar 180 is fixed to the shared fixed terminal 163. The external connection bus bar 180 may be referred to as a heat transfer member.

[0054] Two fixed contact points 167 are formed on the bottom wall surface of the shared fixed terminal 163. By having the two fixed contact points 167, the conductive area of the shared fixed terminal 163 is larger than the conductive area of each of the first fixed terminal 161 and the second fixed terminal 162. The conductive area is the area of the portion in contact with the conduction target, and specifically, it is the sum of the areas of the two fixed contact points 167 provided on the shared fixed terminal 163.

[0055] The movable terminal 170 is formed in a plate shape having a thickness in the axial direction from a metal material excellent in conductivity such as copper. The movable terminal 170 is provided with a rod insertion hole 174. The rod insertion hole 174 is a through hole penetrating the movable terminal 170 in the plate thickness direction. A rod 129 is inserted into the rod insertion hole 174. The movable terminal 170 is attached to the rod 129 with its main surface along the XZ plane. Note that the movable terminal 170 is allowed to displace in the vertical direction between the pressing plate 146 and the movable stopper 148.

[0056] The movable terminal 170 includes a first movable terminal 171 and a second movable terminal 172. The first movable terminal 171 is the movable terminal 170 included in the first relay portion 140A. The first movable terminal 171 is connected to the rod 129 of the first actuator portion 120A. The first movable terminal 171 is driven by the first actuator portion 120A. The first movable terminal 171 makes contact with and separates from the first fixed terminal 161 and the common fixed terminal 163 among the three fixed terminals 160. The first movable terminal 171 is pressed against both the first fixed terminal 161 and the common fixed terminal 163 substantially evenly by the biasing force of the pressing spring 145.

[0057] The second movable terminal 172 is the movable terminal 170 included in the second relay portion 140B. The second movable terminal 172 is connected to the rod 129 of the second actuator portion 120B. The second movable terminal 172 is driven by the second actuator portion 120B. The second movable terminal 172 makes contact with and separates from the second fixed terminal 162 and the common fixed terminal 163 among the three fixed terminals 160. The second movable terminal 172 is pressed against both the second fixed terminal 162 and the common fixed terminal 163 substantially evenly by the biasing force of the pressing spring 145.

[0058] The above-described first movable terminal 171 and second movable terminal 172 are individually displaced by the driving of the first actuator unit 120A and the second actuator unit 120B. Therefore, independent switching between allowing and blocking energization between the first fixed terminal 161 and the shared fixed terminal 163 and between allowing and blocking energization between the second fixed terminal 162 and the shared fixed terminal 163 becomes possible.

[0059] <Housing and External Connection Busbar> As described above, the housing 190 has an upper wall 191, a lower wall 192, side walls 193, and a fixed wall 197. As shown in FIG. 3, the housing 190 is fixed to the fixing base 80 such that the side wall 193 faces the mounting surface 81. One of the side walls 193 facing the mounting surface 81 may be referred to as the opposing wall 193A. The fixed wall 197 is provided on the lower wall 192 so as to be flush with the opposing wall 193A. The opposing surface of the fixed wall 197 with respect to the fixing base 80 is flush with the opposing surface of the opposing wall 193A with respect to the fixing base 80.

[0060] The external connection busbar 180 is formed of a copper plate member. The external connection busbar 180 has a substantially L-shaped configuration in a YZ-plane view. The external connection busbar 180 has a first extension portion 181 and a second extension portion 182. The first extension portion 181 and the second extension portion 182 are integrally connected by the same member. The length of the external connection busbar 180 in the X direction is shorter than the length between the first fixed terminal 161 and the second fixed terminal 162. The first extension portion 181 extends along the upper wall 191 so as to be connected to the shared fixed terminal 163. As an example, the first extension portion 181 is connected to the shared fixed terminal 163 by welding. Note that the connection form between the first extension portion 181 and the shared fixed terminal 163 is not limited to welding.

[0061] The first extension part 181 extends in the Z direction along the upper wall 191. The second extension part 182 is connected to the end of the first extension part 181. The second extension part 182 extends in the Y direction along the opposing wall 193A and the fixed wall 197. The thickness direction of the second extension part 182 corresponds to the Z direction. The length of the second extension part 182 is longer than the combined length of the opposing wall 193A and the fixed wall 197. In addition to the hole 184 described above, a hole 185 to which a bus bar forming the rest of the inverter connection lines 16P and 16N is connected is formed in the second extension part 182. By fastening this bus bar to the external connection bus bar 180 via a fastening member or the like, the shared fixed terminal 163 and the inverter 3 are electrically connected.

[0062] The housing 190 also has a first storage chamber 190A and a second storage chamber 190B. The first storage chamber 190A is a chamber for housing the relay body 140. The second storage chamber 190B is a chamber for housing the electromagnetic actuator 120. The first storage chamber 190A and the second storage chamber 190B are arranged side by side in the Y direction. The inside of the first storage chamber 190A and the inside of the second storage chamber 190B communicate with each other. The first storage chamber 190A is partitioned by the upper part of the side wall 193. The second storage chamber 190B is partitioned by the lower part of the side wall 193. A direct current large current of several tens to several hundreds of amperes flows into the relay body 140 from the wirings 15, 16, and 17. Therefore, the relay body 140 generates heat and becomes high temperature. Along with this, the first storage chamber 190A for housing the relay body 140 becomes high temperature. The temperature of the first storage chamber 190A is higher than the temperature of the second storage chamber 190B.

[0063] <Relay and Terminal Block> As shown in FIG. 3, the relay 100 is disposed on the mounting surface 81 of the fixing base 80 via a heat dissipation sheet 90. The relay 100 is fixed to the fixing base 80 via a fastening member (not shown). Note that the relay 100 does not necessarily have to be fixed to the fixing base 80. The relay 100 may be disposed on the mounting surface 81 via the heat dissipation sheet 90. The relay 100 may be disposed on the mounting surface 81 without the heat dissipation sheet 90. As described above, significant heat is generated in the relay body 140. In the present embodiment, in order to efficiently dissipate the heat of the relay body 140 to the fixing base 80, a heat dissipation sheet 90 with low thermal resistance is provided on the mounting surface 81. The heat generated by the relay 100 is dissipated to the fixing base 80 via the heat dissipation sheet 90.

[0064] In addition, a flow path 82 through which a refrigerant can flow is formed inside the fixing base 80. As the refrigerant, a gas such as a liquid or a gas is applicable. As an example, the flow path 82 is provided so as to overlap the relay 100 in the Z direction. The flow path 82 is provided so as to overlap the housing 190 in the Z direction. The flow path 82 is provided so as to overlap the second extension portion 182 in the Z direction. A second extension portion 182 is provided between the housing 190 and the flow path 82. Since the housing 190 and the second extension portion 182 overlap the flow path 82, the heat of the relay body 140 is efficiently dissipated to the fixing base 80 via the second extension portion 182.

[0065] In this way, the fixing base 80 serves to fix the relay 100 and to cool the relay 100. Note that the flow path 82 does not necessarily have to be provided inside the fixing base 80. The high voltage J / B10 may have a cooler in addition to the components described so far. In that case, the cooler may be mounted on the mounting surface 81. The relay 100 may be disposed on the cooler via the heat dissipation sheet 90.

[0066] <Function and Effect> The high-voltage J / B10 has a relay 100 and wirings 15, 16, 17. The relay 100 has an electromagnetic actuator 120, a relay body 140, an external connection bus bar 180, and a housing 190. An external connection bus bar 180 is connected to a fixed terminal 160 of the electromagnetic actuator 120. The housing 190 has an upper wall 191, a lower wall 192, side walls 193, and a fixed wall 197. A first extension 181 of the external connection bus bar 180 extends along the upper wall 191 so as to be connected to the fixed terminal 160. A second extension 182 of the external connection bus bar 180 extends along the opposing wall 193A and the fixed wall 197. The external connection bus bar 180 is connected to the fixed terminal 160 and fixed to the fixed wall 197. According to this, the second extension 182 and the fixed wall 197 are in close contact. Heat of the relay body 140 can be efficiently radiated to the second extension 182 through the housing 190.

[0067] The external connection bus bar 180 is fixed to the fixed terminal 160 by welding. The external connection bus bar 180 is fixed to the fixed wall 197 via a fastening member 198. According to this, during vibration, a difference in relative movement between the fixing location of the external connection bus bar 180 and the fixed terminal 160 and the fixing location of the external connection bus bar 180 and the fixed wall 197 is unlikely to occur. Along with this, stress concentration on the external connection bus bar 180 and the fixed terminal 160 during vibration is suppressed. The occurrence of a connection failure between the external connection bus bar 180 and the fixed terminal 160 is suppressed.

[0068] Inside the fixed base 80, a flow path 82 through which a refrigerant can flow is formed. In the Z direction, the opposing wall 193A and the flow path 82 overlap. A second extension 182 is provided between the opposing wall 193A and the flow path 82. According to this, the distance between the second extension 182 and the flow path 82 is short. Therefore, compared with the case where the distance between the second extension 182 and the flow path 82 is long, heat can be efficiently radiated from the second extension 182 to the flow path 82.

[0069] Furthermore, between the fixed wall 197 and the flow path 82, a fixing portion of the second extension 182 and the fixed wall 197 is provided. The adhesion between the second extension 182 and the fixed wall 197 is enhanced at the fixing portion. Therefore, heat is more easily transferred from the fixed wall 197 to the second extension 182 at the fixing portion. Compared with a configuration in which the fixing portion of the second extension 182 and the fixed wall 197 is not provided between the fixed wall 197 and the flow path 82, the heat of the relay body 140 can be radiated to the flow path 82 more efficiently. In addition, since the flow path 82 is formed inside the fixed base 80, space can be saved compared to newly providing a cooler. This leads to miniaturization and cost reduction.

[0070] (Second Embodiment) FIG. 6 is a schematic diagram of the relay 100 according to the second embodiment. FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 6. FIG. 8 is a schematic diagram showing a cross-section of the high voltage J / B10 according to the second embodiment. Hereinafter, the configuration different from the first embodiment will be mainly described. Since the configuration without description is the same as that of the first embodiment, the description thereof will be omitted. In the second embodiment, the housing 190 does not have the fixed wall 197. In the second embodiment, a housing hole 293 for accommodating the second extension 182 is formed in the opposing wall 193A. The second extension 182 is accommodated in the housing hole 293. The second extension 182 is fitted inside the housing hole 293. The opposing wall 193A and the second extension 182 have opposing surfaces facing the fixed base 80. The opposing surface of the opposing wall 193A and the opposing surface of the second extension 182 are flush with respect to the XY plane. In the second embodiment, the second extension 182 is fixed to the outside of the first storage chamber 190A and the outside of the second storage chamber 190B.

[0071] In the second embodiment, the second extension part 182 is fixed to both the first storage chamber 190A and the second storage chamber 190B. The second extension part 182 is in close contact with the first storage chamber 190A and the second storage chamber 190B. In the second embodiment, the heat of the relay body 140 can be actively dissipated to the second extension part 182. Therefore, the heat of the relay body 140 can be efficiently dissipated. Also in the second embodiment, the second extension part 182 is provided between the opposing wall 193A and the flow path 82. Furthermore, a fixing portion between the second extension part 182 and the opposing wall 193A is provided between the opposing wall 193A and the flow path 82. At the fixing portion, heat is easily transferred from the opposing wall 193A to the second extension part 182. According to this, compared with a configuration in which the fixing portion between the second extension part 182 and the opposing wall 193A is not provided between the opposing wall 193A and the flow path 82, the heat of the relay 100 can be more efficiently dissipated to the flow path 82.

[0072] Also in the second embodiment, the external connection bus bar 180 is connected to the fixed terminal 160 and fixed to the opposing wall 193A. During vibration, it is difficult for a difference in relative movement to occur between the fixing portion between the external connection bus bar 180 and the fixed terminal 160 and the fixing portion between the external connection bus bar 180 and the opposing wall 193A. Stress concentration on the external connection bus bar 180 and the fixed terminal 160 during vibration is suppressed.

[0073] (Third Embodiment) FIG. 9 is a schematic diagram of the relay 100 according to the third embodiment. FIG. 10 is a schematic diagram showing an example of a cross-section of the high-voltage J / B10 in the third embodiment. In the third embodiment, the second extension portion 182 is fixed to the opposing wall 193A by caulking via the fastening member 382. In the third embodiment, the second extension portion 182 is fixed outside the first storage chamber 190A. The second extension portion 182 is provided between the opposing wall 193A and the flow path 82. More specifically, a fixing portion between the second extension portion 182 and the opposing wall 193A is provided between the opposing wall 193A and the flow path 82. According to this, compared with a configuration in which no fixing portion between the second extension portion 182 and the opposing wall 193A is provided between the opposing wall 193A and the flow path 82, the heat of the relay body 140 can be efficiently dissipated to the flow path 82. Also in the third embodiment, the external connection bus bar 180 is connected to the fixed terminal 160 and fixed to the opposing wall 193A. Stress concentration on the external connection bus bar 180 and the fixed terminal 160 during vibration is suppressed.

[0074] (Fourth Embodiment) FIG. 11 is a cross-sectional view showing a part of the high-voltage J / B10 in the fourth embodiment. In the fourth embodiment, the second extension portion 182 is connected to the opposing wall 193A at two locations. In the housing 190, the first storage chamber 190A is provided on the upper wall 191 side with respect to the center CR in the Y direction. In the housing 190, the second storage chamber 190B is provided on the lower wall 192 side with respect to the center CR in the Y direction. The second storage chamber 190B may extend toward the upper wall 191 side with respect to the center CR of the housing 190. In the fourth embodiment, the opposing wall 193A and the second extension portion 182 are fixed at one location each on the upper wall 191 side and the lower wall 192 side with respect to the center CR of the housing 190. As an example, as the first location, the opposing wall 193A and the second extension portion 182 in the first storage chamber 190A are fixed via the fastening member 482A. As the second location, the opposing wall 193A and the second extension portion 182 in the second storage chamber 190B are fixed via the fastening member 482B. According to this, compared with a form in which the opposing wall 193A and the second extension portion 182 are fixed at one location, the heat of the relay body 140 can be efficiently dissipated to the second extension portion 182.

[0075] Furthermore, the fixed portion between the first storage chamber 190A and the second extension portion 182 overlaps with the flow path 82 in the Z direction. The fixed portion between the second storage chamber 190B and the second extension portion 182 overlaps with the flow path 82 in the Z direction. According to this, compared with the configuration in which the fixed portion between the opposing wall 193A and the second extension portion 182 overlaps with the flow path 82 at one location in the Z direction, the heat of the relay body 140 can be efficiently radiated to the flow path 82. The external connection bus bar 180 is connected to the fixed terminal 160 and fixed to the opposing wall 193A at two locations. Therefore, compared with the configuration in which it is fixed at one location on the opposing wall 193A, stress concentration on the external connection bus bar 180 and the fixed terminal 160 during vibration is effectively suppressed. In the drawings, a form caulked as an example in the fourth embodiment is shown, but the fixing method of the second extension portion 182 and the opposing wall 193A is not limited to this.

[0076] (Fifth Embodiment) FIG. 12 is a schematic diagram of the relay 100 according to the fifth embodiment. In the fifth embodiment, the second extension portion 182 is fixed inside the opposing wall 193A. The second extension portion 182 is inserted into the housing 190. In the fifth embodiment, a fixed portion is provided between the second extension portion 182 and the opposing wall 193A so as to overlap with the flow path 82 in the Z direction. This also achieves the above-described effect. Two methods can be considered as the manufacturing method of the relay 100 according to the fifth embodiment.

[0077] One is a method of assembling housing pieces that are divided into two in the Y direction so as to enclose the electromagnetic actuator 120 and the relay body 140. When molding the housing pieces, insert the external connection bus bar 180 into one of the housing pieces. Do not insert the external connection bus bar 180 into the other housing piece. The housing piece into which the external connection bus bar 180 is inserted may be referred to as the first housing piece. The housing piece into which the external connection bus bar 180 is not inserted may be referred to as the second housing piece. Assemble the electromagnetic actuator 120 and the relay body 140 to the first housing piece so that the fixed terminal 160 can be connected to the external connection bus bar 180. Weld the first extension part 181 to the fixed terminal 160. Then, assemble the second housing piece from the Y direction to the first housing piece so as to enclose the electromagnetic actuator 120, the relay body 140, and the second extension part 182. One of the fourth embodiments manufactures the relay 100 in this way.

[0078] Another one is a method of assembling housing pieces that are divided into two in the Z direction so as to enclose the electromagnetic actuator 120 and the relay body 140. The housing piece into which the external connection bus bar 180 is inserted may be referred to as the third housing piece. The housing piece into which the external connection bus bar 180 is not inserted may be referred to as the fourth housing piece. Assemble the electromagnetic actuator 120 and the relay body 140 to the third housing piece so that the fixed terminal 160 can be connected to the external connection bus bar 180. Weld the first extension part 181 to the fixed terminal 160. Then, assemble the fourth housing piece from the Z direction to the third housing piece so as to enclose the electromagnetic actuator 120, the relay body 140, and the second extension part 182. Another one of the fourth embodiments manufactures the relay 100 in this way.

[0079] (Sixth Embodiment) FIG. 13 is a schematic diagram of the relay 100 according to the sixth embodiment. Also in the sixth embodiment, the second extension portion 182 is fixed inside the opposing wall 193A. The second extension portion 182 is inserted into the housing 190. Also in the sixth embodiment, a fixing portion between the second extension portion 182 and the opposing wall 193A is provided so as to overlap the flow path 82 in the Z direction. Thus, the above-described effects can also be achieved. As a method for manufacturing the relay 100 according to the sixth embodiment, the following method can be considered.

[0080] This is a method of assembling housing pieces that are divided into two parts so as to enclose the electromagnetic actuator 120 and the relay body 140. In the sixth embodiment, unlike the fifth embodiment, the external connection bus bar 180 is originally separated into the first extension portion 181 and the second extension portion 182. The housing piece into which the first extension portion 181 is inserted may be referred to as the fifth housing piece. The housing piece into which the second extension portion 182 is inserted may be referred to as the sixth housing piece. Assemble the electromagnetic actuator 120 and the relay body 140 to the fifth housing piece so that the fixed terminal 160 can be connected to the external connection bus bar 180. Weld the first extension portion 181 to the fixed terminal 160. Then, assemble the sixth housing piece so as to enclose the electromagnetic actuator 120, the relay body 140, and the second extension portion 182 to the fifth housing piece.

[0081] In the sixth embodiment, after assembling the sixth housing piece to the fifth housing piece, the first extension portion 181 and the second extension portion 182 are joined by welding or the like. Hatching is applied to the welding portion between the first extension portion 181 and the second extension portion 182 in the drawing. By welding and joining the first extension portion 181 and the second extension portion 182 later, it is possible to suppress stress concentration at the connection portion between the external connection bus bar 180 and the fixed terminal 160.

[0082] Although this disclosure has been described in accordance with embodiments, it is to be understood that the disclosure is not limited to such embodiments or structures. The disclosure encompasses various modifications and variations within the equivalent scope. In addition, although various combinations and forms are shown in this disclosure, other combinations and forms that include only one element, more than one element, or less than one element thereof are also within the scope and spirit of this disclosure.

[0083] (Disclosure of Technical Ideas) This specification discloses a plurality of technical ideas described in a plurality of clauses listed below. Some clauses may be described in a multiple dependent form that alternatively quotes a preceding clause in subsequent clauses. Some clauses may be described in a multiple dependent form that quotes another multiple dependent form clause. The clauses described in these multiple dependent forms define a plurality of technical ideas. (Technical Idea 1) A device module (10) comprising a relay (100) having a relay body (140) including a fixed terminal (160) electrically connected to a current path (15, 16, 17), and a movable terminal (170) that contacts and separates from the fixed terminal, and a drive unit (120) that displaces the movable terminal to switch between energization and interruption with the fixed terminal, The relay further comprises a heat transfer member (180) that forms a part of the current path and transfers heat, and a housing (190) that houses the fixed terminal, the movable terminal, and the drive unit, The housing has a first wall (191) provided with the fixed terminal, and a second wall (193, 197) different from the first wall, and a first extension (181) that is a part of the heat transfer member is connected to the fixed terminal, A device module in which a second extension part (182), which is the remainder of the heat transfer member, extends along the second wall and is fixed to the second wall. (Technical idea 2) The second wall is a side wall continuous with the first wall, A first storage chamber (190A) for housing the relay body is formed by a part of the second wall, A second storage chamber (190B) for housing the drive part is formed by the remainder of the second wall, The device module according to Technical Idea 1, in which the second extension part is fixed to the first storage chamber. (Technical idea 3) The device module according to Technical Idea 2, in which the second extension part is fixed to the outside or inside of the first storage chamber. (Technical idea 4) Further comprising a flow path (82) through which a refrigerant for cooling the relay flows, The second wall has an opposing wall (193A) opposing the flow path with respect to the thickness direction (Z) of the second extension part, The device module according to Technical Idea 2 or 3, in which the second extension part is provided between the opposing wall and the flow path with respect to the thickness direction. (Technical idea 5) The device module according to Technical Idea 4, in which the fixing position of the second extension part and the opposing wall overlaps the flow path with respect to the thickness direction. (Technical idea 6) The housing further has a third wall (192) provided on the opposite side of the first wall via the second wall, The device module according to Technical Idea 4 or 5, in which the second extension part is further fixed to the opposing wall between the center of the housing and the third wall with respect to the arrangement direction (Y) in which the first storage chamber and the second storage chamber are arranged.

Explanation of reference numerals

[0084] 10 High voltage J / B, 15 Battery connection wire, 16 Inverter connection wire, 17 Charging wire, 82 Flow path, 100 Relay, 120 Electromagnetic actuator, 140 Relay body, 160 Fixed terminal, 170 Movable terminal, 180 External connection bus bar, 181 First extension part, 182 Second extension part, 190 Housing, 190A First storage chamber, 190B Second storage chamber, 191 Upper wall, 192 Lower wall, 193 Side wall, 193A Opposing wall, 197 Fixed wall, Y Arrangement direction, Z Thickness direction.

Claims

1. A device module (10) comprising a relay (100) having a relay body (140) including a fixed terminal (160) electrically connected to a current path (15, 16, 17) and a movable terminal (170) that contacts and separates from the fixed terminal, and a drive unit (120) that displaces the movable terminal to switch between energization and interruption with the fixed terminal, The relay further comprises A heat transfer member (180) that forms part of the current path and transfers heat, A housing (190) that houses the fixed terminal, the movable terminal, and the drive unit, The housing A first wall (191) provided with the fixed terminal, A second wall (193, 197) different from the first wall, A first extension part (181) that is part of the heat transfer member is connected to the fixed terminal, A second extension part (182) that is the rest of the heat transfer member extends along the second wall and is fixed to the second wall. A device module.

2. The second wall is a side wall continuous with the first wall, A first storage chamber (190A) for housing the relay body is formed by a part of the second wall, A second storage chamber (190B) for housing the drive unit is formed by the rest of the second wall, The device module according to claim 1, wherein the second extension part is fixed to the first storage chamber.

3. The device module according to claim 2, wherein the second extension part is fixed to the outside or inside of the first storage chamber.

4. Further comprising a flow path (82) through which a refrigerant for cooling the relay flows, The second wall has an opposing wall (193A) that opposes the flow path with respect to the thickness direction (Z) of the second extension part, The equipment module according to claim 2 or 3, wherein the second extension part is provided between the opposing wall and the flow path in the thickness direction.

5. The equipment module according to claim 4, wherein a fixing portion of the second extension part and the opposing wall overlaps the flow path in the thickness direction.

6. The housing further has a third wall (192) provided on the opposite side of the first wall via the second wall. The equipment module according to claim 5, wherein the second extension part is further fixed to the opposing wall between the center of the housing and the third wall in the arrangement direction (Y) in which the first storage chamber and the second storage chamber are arranged.

Images