JP2018022553A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack capable of accurately detecting the temperature of a connector.SOLUTION: A battery pack 1 comprises: a battery module 20; a housing 10 for housing the battery module 20; a connector 70 connectable to a charger for charging the battery module 20; and a temperature sensor 80 for detecting the temperature of the connector 70. The battery module 20 is arranged in a region A1 in an internal space of the housing 10. The temperature sensor 80 is arranged in a region A2 in the internal space. The housing 10 includes a separation part 17 for thermally separating the region A1 from the region A2.SELECTED DRAWING: Figure 2

Description

  The present invention relates to a battery pack.

  Conventionally, a battery module in which a plurality of battery cells such as lithium ion secondary batteries are arranged in one direction is known. In a battery pack in which such a battery module is housed in a housing, a connector for connecting the battery module to an external device is attached to the housing. For example, in the case of the battery module described in Patent Document 1, a connector that is connected to each bus bar on the positive electrode side and the negative electrode side via a connection member is provided.

JP2013-140769A

  When the external device is a charger for charging the battery module, the temperature of the connector rises due to Joule heat or the like due to the current during charging. Therefore, a temperature sensor that detects the connector temperature is connected to the internal space of the housing of the connector. May be provided on the side. However, since there is a heat source such as a battery module in the internal space of the housing, the temperature around the temperature sensor may rise due to the heat generated by the battery module or the like. In this case, there is a possibility that the temperature of the connector cannot be accurately detected due to the heat generated by the battery module or the like.

  An object of this invention is to provide the battery pack which can detect the temperature of a connector accurately.

  The battery pack of the present invention includes a battery module, a housing that houses the battery module, a connector that can be connected to a charger for charging the battery module, and a temperature sensor that detects the temperature of the connector, The battery module is disposed in a first region in the internal space of the housing, the temperature sensor is disposed in a second region in the internal space, and the housing is separated to thermally separate the first region and the second region. Part.

  In this battery pack, a battery module that can serve as a heat source is disposed in the first region, and a temperature sensor that detects the temperature of the connector is disposed in the second region. The first region and the second region are thermally separated by the separation unit. Thereby, it can suppress that the influence of the heat which a battery module emits reaches a temperature sensor. As a result, the temperature of the connector can be accurately detected.

  The battery pack of the present invention may further include a fuse arranged in the first region. In this case, since the fuse that can be a heat source is arranged in the first region, it is possible to suppress the influence of the heat generated by the fuse from reaching the temperature sensor.

  In the battery pack of the present invention, the connector includes a main body portion attached to the housing, and a connection member that is provided on the main body portion and electrically connects the charger and the battery module. The temperature sensor may be provided in the portion of the connection member having a portion arranged in two regions. In this case, since the temperature sensor is provided on the connection member, the temperature sensor can be integrally attached and detached together with the connection member provided on the main body of the connector.

  In the battery pack of the present invention, the separation unit may include a metal plate. Usually, since a housing | casing is metal, a isolation | separation part can be attached to a housing | casing by welding etc., for example.

  According to the present invention, the temperature of the connector can be detected with high accuracy.

FIG. 1 is an exploded perspective view of a schematic configuration of a battery pack according to an embodiment. FIG. 2 is a front view of the battery pack of FIG. 1 with the lid member removed as viewed from the front. FIG. 3 is a perspective view of the configuration of the battery module of FIG. FIG. 4 is a plan view showing a fuse of the battery pack of FIG. (A) of FIG. 5 is the perspective view which looked at the connector from the back surface side. FIG. 5B is a front view of the connector. FIG. 6 is a schematic side view of the connector of FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. FIG. 8 is a perspective view of a second region of the battery pack of FIG. FIG. 9 is a side view of the second region of the battery pack of FIG. 1 as viewed from the right. 10 is an enlarged cross-sectional view showing the periphery of the connector in FIG. FIG. 11 is an enlarged sectional view showing the periphery of the connector of the battery pack according to the modification.

  Hereinafter, a battery pack 1 according to an embodiment will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. The dimensional ratios in the drawings do not necessarily match those described.

  The battery pack 1 is mounted on a target device such as an automobile and a forklift. As shown in FIGS. 1 and 2, the battery pack 1 includes a housing 10, a plurality (seven in this embodiment) of battery modules 20, a relay unit 50, and a connector 70.

  The housing 10 is made of, for example, metal, and includes a box-shaped member 11 and a lid member 15 connected to the box-shaped member 11. The box-shaped member 11 is a box having an opening 11a. The box-shaped member 11 includes a square plate-like bottom plate 11b, a top plate 11c provided to face the bottom plate 11b, an L-shaped right side plate 11d erected from the periphery of the bottom plate 11b, and a rectangular left side plate 11e. And the rear side plate 11f. In FIG. 1, the rear side of the lid member 15 is illustrated as being seen through.

  When mounted on a target device such as a vehicle, the housing 10 is disposed such that the bottom plate 11b is positioned vertically downward and the top plate 11c is positioned vertically upward. In the following description, in the housing 10, the direction in which the bottom plate 11 b is provided is “down”, the direction in which the top plate 11 c is provided is “up”, and the direction in which the lid member 15 of the housing 10 is provided is “front”. The direction in which the rear side plate 11f is provided is “rear”, the direction in which the right side plate 11d is provided is “right”, and the direction in which the left side plate 11e is provided is “left”. These directions are for convenience of explanation, and do not limit the present invention.

  A connector arrangement region 14 a is formed on the right side surface of the housing 10, that is, on the right side surface of the box-shaped member 11. Specifically, the connector placement region 14a is offset downward from the first side surface 11g offset from the right side plate 11d in the left direction, the second side surface 11i offset from the rear side plate 11f in the forward direction, and the top plate 11c. The third side surface 11h that is inclined downward in the right direction is formed so that the rear side of the housing 10 is recessed. A through hole 12c into which the connector 70 can be inserted is formed in the first side surface 11g.

  The top plate 11c protrudes upward at the central portion in the left-right direction and forms a component placement region 14b. Two working holes 12a and 12b are formed above the component placement region 14b in the top plate 11c. A work hole 13b is formed on the top plate 11c on the right side of the component placement region 14b. The work hole 13b is provided with a lid 13a that covers the opening.

  The housing 10 accommodates, for example, seven battery modules 20. Three battery modules 20 out of the seven battery modules 20 are fixed to the box-shaped member 11 of the housing 10. The remaining four battery modules 20 are fixed to the lid member 15 of the housing 10. The housing | casing 10 is provided with the isolation | separation part 17 which divides the interior space. As will be described in detail later, the separation unit 17 divides the internal space of the housing 10 into an area (first area) A1 including the above-described component arrangement area 14b and an area (second area) adjacent to the connector arrangement area 14a. Compartment into A2. In the housing 10, each battery module 20 is arranged in the area A1, and a part of the connector 70 is arranged in the area A2.

  The battery module 20 and the connector 70 will be described with reference to FIGS. 3, 5, and 6.

  As shown in FIG. 3, the battery module 20 includes a main body 21, a first bracket 31, a second bracket 32, and an elastic member 24.

  The main body 21 includes a plurality of battery cells 22 arranged in one direction (hereinafter also referred to as “array direction D”). In the present embodiment, the main body 21 includes 13 battery cells 22. The battery cell 22 is a secondary battery such as a lithium ion battery or a nickel metal hydride storage battery. Each of the plurality of battery cells 22 is held by a cell holder 23 which is U-shaped when viewed from the arrangement direction D and is open on the upper side.

  The main body 21 includes a cover 29 held by the plurality of cell holders 23 so as to close the upper openings of the plurality of cell holders 23. On the cover 29, a control unit E that performs various controls relating to the battery module 20 is placed.

  The first bracket 31 and the second bracket 32 are made of a highly rigid material, for example, a metal such as iron. Each of the first bracket 31 and the second bracket 32 has a grip portion 33 and an attachment portion 37.

  The holding part 33 is a substantially rectangular flat plate. A plurality of bolts (not shown) extending along the arrangement direction D are inserted through the grip portion 33. Each of the plurality of bolts is screwed and fixed to the nut 35 on the gripping portion 33 side of the second bracket 32.

  The attachment portion 37 is a flat plate erected on one side of the rectangular gripping portion 33. The attachment portion 37 is attached to the box-shaped member 11 or the lid member 15 with a bolt (not shown). Thereby, the first bracket 31 and the second bracket 32 are fixed to the box-shaped member 11 or the lid member 15.

  The elastic member 24 is provided between the main body 21 and the first bracket 31. The elastic member 24 has a plate shape, for example, and is provided such that the thickness direction thereof is the same as the arrangement direction D. The elastic member 24 is made of an elastically deformable material such as rubber and resin sponge. A fixing plate 25 is provided between the elastic member 24 and the main body 21.

  As shown in FIGS. 5A and 5B and FIG. 6, the connector 70 includes a main body 71 and connecting members 74, 75, and 76.

  As for the main-body part 71, the main part 73 which supports the three connection members 74, 75, and 76 with which it is mounted | worn, and the latching board 72 with which the housing | casing 10 is mounted | worn are fastened by the volt | bolt 77 (refer FIG. 10). It is a resin member. Examples of the resin constituting the main body 71 include polypropylene (PP), polyacetal (POM), polycarbonate (PC), polyamide (PA), and the like. The surface of the main portion 73 that is farthest from the locking plate 72 is the front surface 71a of the main body 71, and the surface of the locking plate 72 that is farthest from the front surface 71a is the back surface 71b of the main body 71. In this case, the main body 71 has through holes 74 h to 76 h extending from the front surface 71 a to the back surface 71 b so as to penetrate the main portion 73 and the locking plate 72. The through holes 74h to 76h are separated from each other and are provided in the vicinity of different corners of the surface 71a. The connecting member 74 is inserted into the through hole 74h, the connecting member 75 is inserted into the through hole 75h, and the connecting member 76 is inserted into the through hole 76h. Hereinafter, the direction in which the through holes 74h to 76h extend (or the direction in which the connection members 74, 75, and 76 extend) is simply referred to as “extension direction A”.

  The main portion 73 is a portion located outside the housing 10 when the locking plate 72 is attached to the housing 10, and protrudes from the locking plate 72. The main portion 73 is provided with a fitting portion 73a that is recessed along the extending direction A from the central region of the surface 71a. The fitting portion 73a is a portion that fits with a protrusion (not shown) provided on the charging connector and the jumper connector of the charger, and has a circular shape when viewed along the extending direction A.

  The locking plate 72 has a rectangular shape when viewed along the extending direction A, and each corner portion thereof is located outside the main portion 73 when viewed along the extending direction A. Corresponding holes (not shown) are provided in each corner of the locking plate 72 along the extending direction. Bolts 78 (see FIG. 7) for mounting the connector 70 to the housing 10 are inserted into these holes (not shown). The bolt 78 is screwed into a female screw hole 78h provided in the first side surface 11g.

  The connection member 74 includes a positive electrode terminal 74a, a crimp terminal 74b, a first harness 74c, a tube 74d, and a bracket 79.

  The positive terminal 74a is a cylindrical female terminal inserted into the through hole 74h. The outer peripheral surface of the positive electrode terminal 74a is in contact with the surface constituting the through hole 74h. From the viewpoint of the positive electrode terminal 74a having high conductivity and heat conductivity, the positive electrode terminal 74a is made of, for example, copper. A part of the positive electrode terminal 74 a on the back surface 71 b side protrudes from the back surface 71 b of the main body 71. A portion of the positive electrode terminal 74 a that protrudes from the back surface 71 b of the main body 71 is a first portion (part) 74 </ b> X that is included in the internal space of the housing 10 and is disposed in the region A <b> 2 of the housing 10. A portion of the positive electrode terminal 74a inserted into the through hole 74h is a second portion 74Y that is not included in the internal space of the housing 10 and is not disposed in the region A2.

  The first harness 74c is a wiring for electrically connecting the positive electrode terminal 74a and the relay terminal 60 (see FIG. 2), and extends along the extending direction A from the back surface 71b side. One end of the first harness 74c is inserted into the end of the positive electrode terminal 74a on the back surface 71b side. The positive terminal 74a is caulked at the end where the first harness 74c is inserted. In order to prevent a short circuit between the first harness 74c and other devices, at least a part of the first harness 74c is covered with an insulating tube 74d. From the viewpoint of providing high conductivity and heat conductivity, for example, copper wiring is used as the first harness 74c. A portion of the first harness 74c that is not located in the through hole 74h of the main body 71 is included in the internal space of the housing 10 and is a first portion (part) disposed in the region A2 of the housing 10. 74X. A portion of the first harness 74c located in the through hole 74h of the main body 71 is a second portion 74Y that is not included in the internal space of the housing 10 and is not disposed in the region A2.

  The crimp terminal 74b is a terminal that is crimped to the other end of the first harness 74c exposed from the tube 74d. The crimp terminal 74b is attached to the second terminal 62b (see FIG. 8) of the relay terminal 60, for example.

  The bracket 79 is a member having heat conductivity formed from, for example, a metal or alloy plate. The bracket 79 is provided in the first portion 74X of the connection member 74 in the region A2. Specifically, the bracket 79 is provided in the first harness 74c located between the positive terminal 74a and the crimp terminal 74b. In the present embodiment, the bracket 79 is provided in the vicinity of the positive electrode terminal 74a on the back surface 71b side of the main body 71 and is not covered with the tube 74d in the first harness 74c.

  The bracket 79 has a clamp part 79a wound around the peripheral surface of the first harness 74c, and a flange part 79b extending from the clamp part 79a along the radial direction of the first harness 74c. The clamp portion 79a is wound so as to cover a part of the peripheral surface of the first harness 74c coaxially with the central axis of the first harness 74c. The clamp part 79a contacts the peripheral surface. The flange portion 79b has an L-shaped plate shape.

  The connection member 75 has the same configuration as the connection member 74. The connecting member 75 includes a negative electrode terminal 75a, a crimp terminal 75b, a second harness 75c, and a bracket 79.

  The negative electrode terminal 75 a is a cylindrical female terminal inserted into the through hole 75 h as with the positive electrode terminal 74 a of the connection member 74. The outer peripheral surface of the negative electrode terminal 75a is in contact with the surface constituting the through hole 75h. Similarly to the first harness 74c, the second harness 75c extends along the extending direction A from the back surface 71b side. One end of the second harness 75c is inserted into the end of the negative electrode terminal 75a on the back surface 71b side, and a crimp terminal 75b is provided at the other end of the second harness 75c. A portion of the negative electrode terminal 75 a that protrudes from the back surface 71 b of the main body 71 is a first portion (part) 75 </ b> X that is included in the internal space of the housing 10 and is disposed in the region A <b> 2 of the housing 10. The portion inserted into the through hole 75h in the negative electrode terminal 75a is a second portion (not shown) that is not included in the internal space of the housing 10 and is not disposed in the region A2. A portion of the second harness 75c that is not located in the through hole 75h of the main body 71 is included in the internal space of the housing 10 and is a first portion (part) disposed in the region A2 of the housing 10. 75X. A portion of the second harness 75c located in the through hole 75h of the main body 71 is a second portion that is not included in the internal space of the housing 10 and is not disposed in the region A2.

  The bracket 79 in the connection member 75 has heat conductivity similarly to the bracket 79 of the connection member 74, and is provided in the first portion 75X of the connection member 75 in the region A2. Specifically, the bracket 79 is provided in the second harness 75c located between the negative electrode terminal 75a and the crimp terminal 75b. In the present embodiment, the bracket 79 in the connection member 75 is provided in the vicinity of the negative electrode terminal 75 a on the back surface 71 b side of the main body 71.

  Unlike the connection members 74 and 75, the connection member 76 does not include a bracket. The connecting member 76 includes a positive terminal 76a inserted into the through hole 76h, a crimp terminal 76b, and a third harness 76c. The length of the third harness 76c of the connecting member 76 is shorter than the first harness 74c and the second harness 75c.

  The battery pack 1 includes a temperature sensor 80 that detects the temperature of the connector 70. The temperature sensor 80 may include a temperature detection element 81, a harness 82, a fastening member 83, a temperature detection element 84, a harness 85, a fastening member 86, and a communication connector 87.

  The temperature detection element 81 is an element for detecting the temperature of the positive terminal 74a (the temperature of the connector 70) via the first harness 74c and the bracket 79. The temperature detection element 81 is installed on the flange portion 79 b of the connection member 74. That is, the temperature detection element 81 of the temperature sensor 80 is disposed in the first portion 74X of the connection member 74 in the region A2. As the temperature detection element 81, for example, a thermistor is used. The harness 82 is a conductive wire that transmits the detection result of the temperature detection element 81 to the communication connector 87. The fastening member 83 includes a bolt and a nut for fastening the temperature detecting element 81 to the flange portion 79b.

  The temperature detection element 84 is an element for detecting the temperature of the negative electrode terminal 75a (the temperature of the connector 70) via the second harness 75c and the bracket 79. The temperature detection element 84 is provided on the flange portion 79 b of the connection member 75. That is, the temperature detection element 84 of the temperature sensor 80 is disposed in the first portion 75X of the connection member 75 in the region A2. For example, a thermistor is used as the temperature detection element 84. The harness 85 is a conducting wire that transmits a detection result by the temperature detection element 84 to the communication connector 87. The harnesses 82 and 65 are bundled in the vicinity of the communication connector 87. The fastening member 86 includes a bolt and a nut for fastening the temperature detecting element 81 to the flange portion 79b.

  The communication connector 87 is a terminal portion connected to the battery control ECU of the junction box 51, for example. The communication connector 87 outputs the detection result of the temperature detection element 81 input via the harness 82 and the detection result of the temperature detection element 84 input via the harness 85 to the battery control ECU.

  Returning to FIG. 2, a relay unit 50 including a junction box 51, wirings L <b> 1 to L <b> 3, a relay R, and a relay terminal 60 is interposed between the battery module 20 and the connector 70. The relay unit 50 is accommodated in the housing 10.

  The junction box 51 is arranged in the component arrangement area 14 b of the housing 10. Junction box 51 includes a battery control ECU (Electronic Control Unit) (not shown). The battery control ECU performs monitoring and control of the battery module 20. For example, the battery control ECU communicates with the control unit E mounted on each battery module 20 to acquire information on the state (for example, the charging state) of each battery module 20, and the operation of each battery module 20 ( For example, charge / discharge etc. are controlled. The battery control ECU controls the battery pack 1 according to the type of connector attached to the connector 70, for example. For example, when the charging connector of the charger is attached to the connector 70, the battery control ECU controls the battery pack 1 to charge the battery module 20. When the jumper connector is attached to the connector 70, the battery control ECU controls the battery pack 1 so as to supply power to the target device.

  The battery control ECU is electrically connected to the temperature sensor 80 via the communication connector 87 (not shown). The battery control ECU, for example, based on the detection result of the temperature detection elements 81 and 84 input via the communication connector 87, for example, a control signal for switching operation of the relay R between the on state and the off state, or energization between the battery modules 20 Outputs a control signal for stop operation.

  As shown in FIGS. 2 and 4, in the junction box 51, the wiring L <b> 1 is connected to the positive terminal of each battery module 20 via the plurality of harnesses H, and the wiring L <b> 2 is connected to the negative terminal. More specifically, the wiring L1 includes bus bars L11, L12, L13, L14 and a bus bar L15.

  The bus bar L11 is connected to each positive terminal of the four battery modules 20 arranged on the front side via a harness H. The bus bar L12 is connected to each positive terminal of the three battery modules 20 disposed on the rear side via a harness H. The bus bar L13 connects the bus bar L11 and the bus bar L12. The bus bar L14 connects the bus bar L13 and the bus bar L15 via the fuse 52. The bus bar L15 is electrically connected to the first harness 74c of the connector 70 (see FIGS. 7 and 8).

  The fuse 52 is arranged in the area A1 including the component arrangement area 14b. That is, the battery pack 1 includes a fuse 52 arranged in the first region. The fuse 52 can generate heat due to Joule heat of current flowing through the wiring L1. The fuse 52 is, for example, a power fuse that melts the internal wiring when an excessive current flows through the wiring L1.

  The wiring L2 includes bus bars L21, L22, L23, L24, L25 and a bus bar L26. The bus bar L21 is connected to each negative terminal of the four battery modules 20 disposed on the front side via a harness H. The bus bar L22 is connected to each negative terminal of the three battery modules 20 disposed on the rear side via a harness H. The bus bar L23 connects the bus bar L21 and the bus bar L22. The bus bar L24 electrically connects the bus bar L22 and one terminal of the relay R. The bus bar L25 electrically connects the other terminal of the relay R and the second harness 75c of the connector 70 (see FIG. 7). The bus bar L26 branches from the bus bar L24 and is connected to the output terminal 65a.

  The wiring L3 electrically connects the third harness 76c of the connector 70 and the output terminal 65b.

  The relay R can be switched between an on state (conduction state) in which each battery module 20 and the connector 70 are electrically connected, and an off state (interruption state) in which each battery module 20 and the connector 70 are electrically disconnected. . The relay R is, for example, a mechanical relay, and performs switching operation between an on state and an off state by a control signal from the battery control ECU.

  As shown in FIGS. 7 to 9, the relay terminal 60 includes a base portion 61 including a standing portion 63, a first terminal 62 a, a second terminal 62 b, a third terminal 62 c, and a fourth terminal 62 d. And a jumper member 62j.

  The base portion 61 is a member for supporting the first terminal 62a to the fourth terminal 62d. The base portion 61 supports the first terminal 62a to the fourth terminal 62d while insulating the first terminal 62a to the fourth terminal 62d from each other. As an example, the base portion 61 is fitted and fixed in a through hole provided in the terminal arrangement portion 18 b of the separation portion 17. In the base portion 61, a standing portion 63 is formed by a pair of trapezoidal portions. The standing portion 63 is supported by the third terminal 62c. The base portion 61 is molded from, for example, a resin from the viewpoint of the insulating properties of the first terminal 62 a to the fourth terminal 62 d and the ease of molding of the base portion 61.

  The 1st terminal 62a, the 2nd terminal 62b, and the 4th terminal 62d are arranged along terminal arrangement part 18b mentioned below in the state where base 61 was fixed to terminal arrangement part 18b. The third terminal 62c is disposed above the first terminal 62a, the second terminal 62b, and the fourth terminal 62d by the standing portion 63. One end of a jumper member 62j having a bowl shape is disposed on the third terminal 62c. The other end of the jumper member 62j is disposed on the fourth terminal 62d. The third terminal 62c and the fourth terminal 62d are electrically connected by a jumper member 62j.

  In the relay terminal 60, the first harness 62c of the connector 70 is connected to the first terminal 62a, the first harness 74c of the connector 70 is connected to the second terminal 62b, and the connector 70 is connected to the third terminal 62c. The third harness 76c is connected. Therefore, the third harness 76c of the connector 70 is connected to the fourth terminal 62d via the jumper member 62j.

  In the battery pack 1 configured as described above, when the charging connector of the charger is connected to the connector 70, the positive terminal 74a and the negative terminal 75a are connected to each other, and each battery module 20 is charged. When the jumper connector is connected to the connector 70, the positive terminal 74a and the positive terminal 76a are connected to each other, and it becomes possible to output power via the output terminals 65a and 65b.

  In the battery pack 1, for example, during charging of the battery module 20, the input temperature detection result of the temperature detection element 81 and the input temperature detection result of the temperature detection element 84 are monitored by the battery control ECU. When the battery control ECU determines that the temperature detected by at least one of the temperature detection elements 81 and 84 exceeds a predetermined threshold (for example, any temperature within a range of 100 ° C. to 200 ° C.), the battery module Even if charging of 20 is not completed, the relay R is turned off by the battery control ECU. Alternatively, energization between the battery modules 20 is stopped by the battery control ECU.

  Next, the separation unit 17 will be described with reference to FIGS. As shown in FIGS. 7 to 10, the separation unit 17 includes a region A <b> 1 in which the battery module 20 is disposed in the internal space of the housing 10, a relay terminal 60, a part of the connector 70, and a temperature sensor 80. Area A2 is spatially partitioned. The separation unit 17 spatially partitions the region A1 and the region A2 means that the separation unit 17 serves as a member of the housing 10 so as to divide the internal space of the housing 10 into a plurality of (here, two) spaces. By being provided, it means that the region A1 and the region A2 are formed, and the region A1 and the region A2 are thermally separated. The separation part 17 may be provided separately from the battery module 20 and the fuse 52 in the region A1. Separation part 17 may be provided apart from the 1st harness 74c, the 2nd harness 75c, bracket 79, and temperature sensor 80 in field A2. The region A2 has a certain water tightness from the viewpoint of waterproofness. The region A2 may be sealed.

  The separation unit 17 includes a first separation plate 17a and a second separation plate 17b. As shown in FIGS. 7 to 10, the first separation plate 17 a includes a vertical portion 18 a that extends in the vertical direction when viewed from the front direction, and a terminal arrangement portion that extends in the horizontal direction and in which the relay terminal 60 is disposed. 18b, and the connection part 18c extended so that the terminal arrangement | positioning part 18b and the 1st side surface 11g may be connected. The second separation plate 17b forms a surface orthogonal to the front-rear direction with respect to the space surrounded by the vertical portion 18a, the terminal arrangement portion 18b, the connection portion 18c, the top plate 11c, and the first side surface 11g ( (See FIG. 2).

  The first separation plate 17a and the second separation plate 17b are made of, for example, a metal plate. The first separation plate 17a and the second separation plate 17b are preferably made of the same material as that of the housing 10 from the viewpoint of ease of welding, for example. By joining the housing 10 and the separation part 17 by welding, strength and water tightness can be easily ensured.

  Here, in the area A <b> 1, the temperature rises easily due to the heat generated by the battery module 20 and the fuse 52. In the region A1, air convection occurs with the temperature rise, and temperature distribution may be nonuniform. Here, since the region A2 is spatially partitioned by the separation unit 17, even if the temperature increase in the region A1 as described above occurs, the influence of the temperature increase in the region A1 is suppressed. Yes. That is, the region A2 is thermally separated from the region A1 by the separation unit 17.

  As described above, in the battery pack 1 of the above-described embodiment, each battery module 20 that can be a heat source is arranged in the area A1, and the temperature sensor 80 that detects the temperature of the connector 70 is arranged in the area A2. The region A1 and the region A2 are thermally separated by the separation unit 17. Thereby, it can suppress that the influence of the heat which the battery module 20 emits reaches the temperature sensor 80. FIG. As a result, the temperature of the connector 70 can be detected with high accuracy.

  The battery pack 1 includes a fuse 52 disposed in the region A1. Thus, since the fuse 52 that can be a heat source is arranged in the region A1, it is possible to suppress the influence of the heat generated by the fuse 52 from reaching the temperature sensor 80.

  In the battery pack 1, the connector 70 includes a main body portion 71 attached to the housing 10, and connection members 74 and 75 that are provided on the main body portion 71 and electrically connect the charger and the battery module 20. . The temperature sensor 80 is provided in the first portion 74X of the connection member 74 and the first portion 75X of the connection member 75. Thus, since the temperature sensor 80 is provided in the first portion 74X of the connection member 74 and the first portion 75X of the connection member 75, the temperature sensor is connected together with the connection members 74 and 75 provided in the main body 71 of the connector 70. 80 can be attached and detached integrally.

  In the battery pack 1, the separation part 17 includes a metal plate. Since the housing | casing 10 is metal, the isolation | separation part 17 can be attached to a housing | casing by welding etc., for example.

  Although one embodiment has been described above, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the invention.

  In the above embodiment, the battery pack 1 in which the area A2 has a space volume in which the relay terminal 60 can be disposed is illustrated. However, for example, as illustrated in FIG. 11, the battery pack 1A is modified to have a reduced space volume in the area A2. May be.

  The battery pack 1A includes a separation portion 17A including a terminal arrangement portion 18bA instead of the terminal arrangement portion 18b, and a relay including a base portion 61A and an upright portion 63A instead of the relay terminal 60 including the base portion 61 and the standing portion 63. The battery pack 1 is different from the battery pack 1 in that the terminal 60A and a connector 70A including a connection member 74A instead of the connection member 74 are provided.

  In the battery pack 1A, the length in the left-right direction of the base portion 61A in the relay terminal 60A is made shorter than the length in the left-right direction of the base portion 61 as the terminal arrangement portion 18bA becomes shorter in the left-right direction. Yes. Further, the length of the standing portion 63A in the left-right direction is shorter than the length of the standing portion 63 in the left-right direction. The standing portion 63A is formed by, for example, a pair of trapezoidal portions whose bottom angle on the vertical portion 18a side is substantially a right angle. The second terminal 62b is moved so as to be positioned below the third terminal 62c, and is connected to the connection member 74A in which the length of the first harness 74c is shortened. In addition, although illustration is abbreviate | omitted in FIG. 11, the 1st terminal 62a may be moved to the position corresponding to the horizontal direction position of the 3rd terminal 62c. In the battery pack 1A as described above, the length of the terminal arrangement portion 18bA in the left-right direction is made shorter than the length of the terminal arrangement portion 18b in the left-right direction, so that the space volume of the area A2 (the space around the temperature sensor 80) Volume) is reduced. Thereby, the difference between the temperature detected by the temperature sensor 80 and the temperature of the connector 70 is suppressed, and the temperature of the connector 70 can be detected with higher accuracy.

  In the above-described embodiment or modification, the separation part 17 is configured by a metal plate separate from the relay terminal 60. However, for example, the separation part 17 and the relay terminal 60 may be integrally formed of a resin material.

  In the above-described embodiment or modification, the separation unit 17 is configured by one metal plate. However, for example, the separation unit 17 is configured by two or more metal plates and is sealed by the two or more metal plates. An internal space may be defined. In this case, by providing an air layer that functions as a heat insulating layer, heat transfer from the region A1 to the region A2 can be further suppressed.

  In the said embodiment or modification, although the isolation | separation part 17 partitioned off area | region A1 and area | region A2 spatially, it is not necessary to partition | divide area | region A1 and area | region A2 spatially. In short, as long as the separation unit thermally separates the region A1 and the region A2, the internal space of the housing 10 may not be divided into a plurality of spaces. For example, the separating unit may be a covering member that has a heat insulating property and directly covers the temperature sensor 80.

  DESCRIPTION OF SYMBOLS 1,1A ... Battery pack, 10 ... Housing | casing, 17 ... Separation part, 20 ... Battery module, 22 ... Battery cell, 52 ... Fuse, 70 ... Connector, 71 ... Main-body part, 74, 75 ... Connection member, 80 ... Temperature Sensor, A1... Region (first region), A2... Region (second region).

Claims (4)

A battery module;
A housing for housing the battery module;
A connector connectable to a charger for charging the battery module;
A temperature sensor for detecting the temperature of the connector;
With
The battery module is disposed in a first region in the internal space of the housing,
The temperature sensor is disposed in a second region in the internal space,
The casing includes a separation part that thermally separates the first region and the second region.   The battery pack according to claim 1, further comprising a fuse disposed in the first region. The connector is
A main body attached to the housing;
A connecting member provided in the main body, and electrically connecting the charger and the battery module;
Including
The connection member has a portion arranged in the second region,
The battery pack according to claim 1, wherein the temperature sensor is provided in the portion of the connection member.   The battery pack according to claim 1, wherein the separation unit includes a metal plate.

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