JPWO2018003437A1 - Battery module - Google Patents

Abstract

A battery module capable of coping with an increase in voltage detection lines and temperature detection lines accompanying an increase in the number of battery cells and realizing a reduction in size. The battery module 100 includes a plurality of battery cells 10, a plurality of voltage detection lines 20 connected to the external terminals 11 of the battery cells 10, and a plurality of temperature detection lines 30 connected to the battery cells 10. . The plurality of battery cells 10 are arranged such that the gas discharge valves 15 provided on the upper surface 10a of the battery cell 10 are arranged in one direction (X-axis direction). A first laying portion 70 for laying a plurality of temperature detection lines 30 along one direction (X-axis direction) is provided above the gas discharge valves 15 of the plurality of battery cells 10. A second laying portion 80 for laying the plurality of voltage detection lines 20 along one direction (X-axis direction) is provided on the side of the first laying portion 70.

Description

  The present invention relates to a battery module including a plurality of battery cells.

  Conventionally, an invention relating to a battery system having a battery block including a plurality of battery cells is known (see Patent Document 1 below). The conventional battery system includes a battery block including a plurality of battery cells, a pair of output terminals provided at both ends of the battery block, and a voltage detection line for detecting a voltage between the terminals of the plurality of battery cells. (See the same document, claim 1 etc.).

  In the conventional battery system, the plurality of voltage detection lines are arranged on a rectangular block wiring surface serving as one surface of the battery block and are assembled into a first collection line and a second collection line. The first assembly line and the second assembly line include a pair of parallel lines extending in the longitudinal direction of the block wiring surface, and the block wiring from one end in the longitudinal direction of the block wiring surface. Pulled out of the plane.

  Furthermore, the pair of output terminals includes a first output terminal located on an end side from which the first and second assembly lines are drawn, and an end portion on which the first output terminal is provided. And a second output terminal located at the opposite end. The first output terminal is located outside the pair of parallel lines in the short direction of the block wiring surface.

  Further, the conventional battery system includes at least one temperature sensor for detecting the temperature of the battery block, and a temperature detection line for transmitting a signal of the temperature sensor (the same document, claim 2 and the like). reference). The temperature detection line is positioned between the pair of parallel lines in the short direction of the block wiring surface, and is led out of the block wiring surface from the end on the second output terminal side.

  As described above, in the conventional battery system, the temperature detection line that transmits the signal of the temperature sensor that detects the temperature of the battery block is disposed between the pair of parallel lines, and the end on the second output terminal side. It is pulled out of the block wiring surface from the part. Thereby, the voltage detection line and the temperature detection line can be drawn out from the battery block without intersecting, and these detection lines can be wired in an ideal state (see the same document, paragraph 0011, etc.).

  Such a battery system is used in a power supply device that supplies electric power to a motor that drives an electric vehicle. Examples of the electric vehicle include an electric vehicle such as a hybrid vehicle or a plug-in hybrid vehicle that runs with both an engine and a motor, or an electric vehicle that runs only with a motor (see the same document, paragraph 0052, etc.).

Japanese Patent Laying-Open No. 2015-185414

  In a battery module that includes a plurality of battery cells and is mainly used for in-vehicle applications, more battery cells tend to be used as the battery cells are reduced in cost and size. As the number of battery cells used in the battery module increases, the number of voltage detection lines and temperature detection lines connected to the battery cells also increases. Therefore, as in the conventional battery system described above, the voltage detection lines are assembled and arranged on the wiring surface of the battery block, and only by pulling out from the battery block without crossing the voltage detection line and the temperature detection line, Space may be insufficient, and it may be difficult to reduce the size of the battery module.

  The present invention has been made in view of the above problems, and an object of the present invention is to provide a battery module that can cope with an increase in voltage detection lines and temperature detection lines accompanying an increase in the number of battery cells and can be downsized. And

  In order to achieve the above object, a battery module of the present invention includes a plurality of battery cells, a plurality of voltage detection lines connected to external terminals of the battery cells, and a plurality of temperature detection lines connected to the battery cells. The plurality of battery cells are arranged such that gas discharge valves provided on the upper surface of the battery cells are arranged in one direction, and the gas discharge valves of the plurality of battery cells A first laying portion is provided above the plurality of temperature detection lines along the one direction, and a plurality of voltage detection lines are laid along the one direction at a side of the first laying portion. Two laying parts are provided.

  According to the battery module of the present invention, a plurality of temperature detection lines are provided in a space above the gas discharge valve that has not been conventionally used by the first laying portion provided above the gas discharge valves of the plurality of battery cells. Can be laid along one direction in which the gas discharge valves are arranged. Moreover, according to the battery module of the present invention, by laying a plurality of voltage detection lines along one direction in which the gas discharge valves are arranged by the second laying portion provided on the side of the first laying portion, A plurality of temperature detection lines and a plurality of voltage detection lines can be efficiently arranged. Therefore, according to the present invention, it is possible to provide a battery module that can cope with an increase in voltage detection lines and temperature detection lines accompanying an increase in the number of battery cells and can be downsized.

1 is an external perspective view of a battery module according to Embodiment 1 of the present invention. 1 is an exploded perspective view of the battery module shown in FIG. FIG. 3 is an external perspective view of the battery block shown in FIG. 2. The external appearance perspective view of the battery cell shown in FIG. The top view which removed a part of cover of the battery module shown in FIG. FIG. 6 is an enlarged plan view of the battery module shown in FIG. 5. Sectional drawing of the battery module shown in FIG. Sectional drawing of the battery module which concerns on Embodiment 2 of this invention. Sectional drawing of the battery module which concerns on Embodiment 3 of this invention. The block diagram of the battery system containing the battery module shown in FIG. FIG. 11 is a flowchart showing the operation of the battery system shown in FIG. 10.

  Hereinafter, embodiments of a battery module according to the present invention will be described with reference to the drawings.

(Embodiment 1)
FIG. 1 is an external perspective view of a battery module 100 according to Embodiment 1 of the present invention. FIG. 2 is an exploded perspective view of the battery module 100 shown in FIG.

  The battery module 100 according to the present embodiment includes a plurality of battery cells 10, a plurality of voltage detection lines 20 connected to the external terminals 11 of each battery cell 10, and a plurality of temperature detection lines connected to the plurality of battery cells 10. 30. Moreover, the battery module 100 can be provided with the cover 40 which covers the upper surface 10a of the some battery cell 10 like the example of illustration. In the illustrated example, the cover 40 includes an insulation cover 41 and a top cover 42, and the top cover is provided so as to be divided into end portions 42A and 42B and a central portion 42C.

  The battery cell 10 is a flat prismatic secondary battery such as a lithium ion secondary battery, for example, and is stacked in the thickness direction to form a substantially rectangular parallelepiped battery block 50. In the following, an orthogonal coordinate system in which the longitudinal direction of the battery block 50, that is, the stacking direction of the battery cells 10, is the X-axis direction, the short direction of the battery block 50 is the Y-axis direction, and the height direction of the battery block 50 is the Z-axis direction. Each part of the battery module 100 may be described using

  3 is an external perspective view of the battery block 50 shown in FIG.

  The battery block 50 includes a plurality of battery cells 10, a cell holder 51 that holds each battery cell 10, a pair of end plates 52 disposed at both ends in the stacking direction of the plurality of battery cells 10, and the pair of end plates 52. And a pair of side plates 53 disposed on both sides of each other.

  The cell holder 51 is made of an insulating resin material such as engineering plastic. The cell holder 51 includes an intermediate cell holder 51A disposed between the battery cells 10 and a pair of end cell holders 51B disposed at both ends of the plurality of battery cells 10 stacked via the plurality of intermediate cell holders 51A. doing. The cell holder 51 is alternately arranged with the battery cells 10 in the stacking direction (X-axis direction) of the plurality of battery cells 10, and sandwiches each battery cell 10 from both sides in the thickness direction (X-axis direction). The battery cells 10 are stacked in the thickness direction. In addition, the intermediate cell holder 51A also has a role as a spacer that spaces the two battery cells 10 adjacent in the stacking direction.

  The pair of end plates 52 are metal members formed in a rectangular flat plate shape corresponding to the shape of the wide side surface 12a (see FIG. 4) of the battery container 12 constituting the battery cell 10, for example. The pair of end plates 52 are arranged to face the end cell holders 51B arranged at both ends in the stacking direction of the plurality of battery cells 10, and the plurality of battery cells 10 stacked via the cell holder 51 are arranged on both sides in the stacking direction. It is pinched from. The pair of end plates 52 has, for example, screw holes for fastening the pair of side plates 53.

  The pair of side plates 53 are, for example, metal rectangular plate-like members, have through holes for inserting fastening members 54 such as bolts at both ends in the longitudinal direction, and one end in the short direction is substantially perpendicular. It is bent into an L shape. In the pair of side plates 53, for example, one end and the other end in the short direction are fitted into the groove portions of the cell holder 51, and fastening members 54 such as bolts are inserted through the through holes at both ends in the longitudinal direction. Are coupled to the pair of end plates 52 by fastening them to the screw holes of the end plates 52.

  In the battery block 50, for example, a plurality of battery cells 10 are stacked with an intermediate cell holder 51A interposed therebetween, end cell holders 51B and end plates 52 are disposed at both ends in the stacking direction of the plurality of battery cells 10, and the end plate 52 It can be configured by fastening the side plate 53 with the fastening member 54. The plurality of battery cells 10 constituting the battery block 50 are secured via a cell holder 51 between a pair of end plates 52 whose intervals are defined by a pair of side plates 53.

  4 is an external perspective view of the battery cell 10 shown in FIG.

  The battery cell 10 is, for example, a flat prismatic lithium ion secondary battery, and includes a rectangular upper surface 10a, a pair of external terminals 11 that are spaced apart in the longitudinal direction (Y-axis direction) of the upper surface 10a, and the pair of And a gas discharge valve 15 provided between the external terminals 11. The battery cell 10 includes a metal battery container 12 made of, for example, aluminum or an aluminum alloy. The battery container 12 has a flat rectangular parallelepiped shape, and has a wide side surface 12a having a large area on both sides in the thickness direction (X-axis direction) and a narrow side surface 12b having a small area on both sides in the width direction (Y-axis direction). ing.

  The battery container 12 includes, for example, a bottomed rectangular tube-shaped battery can 13 having an open top, and a rectangular plate-shaped battery lid 14 that seals the opening of the battery can 13. The battery lid 14 is joined to the opening of the battery can 13 by laser welding, for example. Inside the battery container 12, for example, a wound electrode group obtained by laminating and winding electrodes and a separator, a current collector plate that connects the electrode of the wound electrode group and the pair of external terminals 11, An insulating sheet that insulates between the electrode group and the battery container, an electrolytic solution impregnated in the wound electrode group, and the like are accommodated.

  One of the pair of external terminals 11 is a positive external terminal 11P, and the other is a negative external terminal 11N. The pair of external terminals 11 are arranged separately from one end and the other end in the longitudinal direction (Y-axis direction) of the rectangular upper surface 10 a of the battery cell 10, that is, the rectangular upper surface 10 a of the battery cover 14. The battery case 12 is electrically insulated by an insulating resin gasket 16 disposed therebetween.

  The gas discharge valve 15 is provided between the pair of external terminals 11 disposed on the upper surface 10 a of the battery cell 10, that is, the upper surface 10 a of the battery lid 14. The gas discharge valve 15 is provided by, for example, pressing a central portion in the longitudinal direction of the battery lid 14 to form a thin portion in the battery lid 14 and forming a slit groove in the thin portion. The gas discharge valve 15 is opened when, for example, gas is generated inside the battery container 12 due to an abnormality such as overcharging of the battery cell 10 and the internal pressure of the battery container 12 rises above a predetermined pressure. By discharging the gas inside the container 12 to the outside, the safety of the battery cell 10 is secured.

  Further, the battery lid 14 has a liquid injection hole 17 for injecting an electrolytic solution into the battery container 12 and a liquid injection plug 18 for sealing the liquid injection hole 17. For example, after injecting an electrolytic solution into the battery container 12 through the liquid injection hole 17 of the battery lid 14, the liquid injection hole 17 is joined to the liquid injection hole 17 by laser welding to thereby connect the liquid injection hole 17. 18 can be sealed.

  As shown in FIG. 3, the plurality of battery cells 10 constituting the battery block 50 are stacked with the wide side surface 12 a (see FIG. 4) of the battery container 12 facing each other, and the gas provided on the upper surface 10 a of the battery cell 10. The discharge valves 15 are arranged so as to line up in one direction (X-axis direction). More specifically, the gas discharge valve 15 is provided at the center in the longitudinal direction (Y-axis direction) of the rectangular upper surface 10a of the battery cell 10, so that the gas discharge valves 15 of the plurality of battery cells 10 have a plurality of batteries. The cells 10 are arranged in a line in the stacking direction (X-axis direction), that is, the short side direction (X-axis direction) of the rectangular upper surface 10a of the battery cell 10, that is, the thickness direction (X-axis direction) of the battery cell 10. .

  The plurality of battery cells 10 constituting the battery block 50 include a positive external terminal 11P of one battery cell 10 and a negative external terminal 11N of the other battery cell 10 out of two battery cells 10 adjacent in the stacking direction. Are alternately inverted 180 ° so as to be adjacent in the stacking direction. The positive external terminal 11P and the negative external terminal 11N adjacent to each other in the stacking direction of the plurality of battery cells 10 are connected by the bus bar 60 shown in FIG. That is, the plurality of battery cells 10 are connected in series by the plurality of bus bars 60 that connect the positive electrode external terminal 11P and the negative electrode external terminal 11N adjacent in the stacking direction. Bus bar 60 is joined to the upper surface of external terminal 11 of battery cell 10 by, for example, laser welding.

  In the battery module 100 of the present embodiment, the plurality of voltage detection lines 20 illustrated in FIG. 2 are connected to the external terminals 11 of the individual battery cells 10. More specifically, the plurality of voltage detection lines 20 are connected to the bus bar 60 and are connected to the external terminals 11 of the individual battery cells 10 via the bus bar 60. One end of each of the plurality of voltage detection lines 20 is connected to the external terminal 11 of each battery cell 10 via the bus bar 60, and the other end is connected to the connector 21.

  The connector 21 of the voltage detection line 20 is connected to, for example, a battery control unit (BCU). The BCU detects the voltage of each battery cell 10 via a plurality of voltage detection lines 20 connected to the external terminal 11 of each battery cell 10. The plurality of voltage detection lines 20 are bundled, for example, inside the opening 43 of the top cover 42 and passed through the tube 22. The tube 22 covering the bundled voltage detection lines 20 extends from the inside of the opening 43 of the top cover 42 to the connector 21 outside the cover 40, for example.

  In the battery module 100 of the present embodiment, the plurality of temperature detection lines 30 illustrated in FIG. 2 are connected to the plurality of battery cells 10. In the example shown in FIG. 2, two sets of six temperature detection lines 30 are connected to the upper surfaces 10 a of the three battery cells 10. The temperature detection line 30 has one end connected to the thermistor and the other end connected to the connector 31. The thermistor connected to one end of the temperature detection line 30 comes into contact with the upper surface 10 a of the battery cell 10 by a pressing member 32 provided at one end of the temperature detection line 30.

  The connector 31 of the temperature detection line 30 is connected to a BCU (not shown), for example, like the connector 21 of the voltage detection line 20. The BCU detects, for example, the voltage of each thermistor that has contacted the upper surface 10a of the battery cell 10 with a set of two temperature detection lines 30 connected to each thermistor, so that the individual thermistors are in contact with each other. The temperature of the battery cell 10 is detected. Note that the number of thermistors and the number of battery cells 10 that detect the temperature by contacting the thermistors are not particularly limited, and may be 2 or less or 4 or more, respectively, as necessary.

  Similar to the voltage detection line 20, the plurality of temperature detection lines 30 are bundled inside the opening 43 of the top cover 42 and passed through the tube 33. The tube 33 that covers the plurality of bundled temperature detection lines 30 is, for example, from the inside of the opening 43 of the top cover 42 to the outside of the cover 40, similarly to the tube 22 that covers the plurality of bundled voltage detection lines 20. It extends to the connector 31.

  As shown in FIG. 1 and FIG. 2, the cover 40 includes, for example, an insulation cover 41 arranged to face the upper surfaces 10 a of the plurality of battery cells 10 constituting the battery block 50, and an upper portion of the insulation cover 41. The top cover 42 is covered.

  The insulation cover 41 is a thin plate-like member that is made of, for example, an insulating resin material such as engineering plastic and covers at least a part of the upper surfaces 10 a of the plurality of battery cells 10. The insulation cover 41 is a three-dimensional structure having a large number of partition walls and openings and having a substantially rectangular parallelepiped shape. The insulation cover 41 holds the plurality of bus bars 60 in a concave portion and electrically insulates the adjacent bus bars 60 from each other.

  The insulation cover 41 has openings above the gas discharge valves 15 of the plurality of battery cells 10 arranged in one direction, and communicates in the stacking direction (X-axis direction) of the plurality of battery cells 10 by the partition walls. 44 is formed. For example, the gas discharge groove 44 is opened at the lower end so as to face the gas discharge valve 15 of the plurality of battery cells 10, and gas in the longitudinal direction of the upper surface 10 a of the battery cell 10, that is, the short direction (Y-axis direction) of the battery block 50. There are partition walls on both sides of the discharge valve 15, and the upper end is open.

  The top cover 42 is made of, for example, the same resin material as that of the insulation cover 41, and is divided into three portions, that is, end portions 42A and 42B and a central portion 42C in the short direction (Y-axis direction) of the battery block 50. The end portions 42 </ b> A and 42 </ b> B of the top cover 42 cover the plurality of bus bars 60 arranged on the insulation cover 41. The central portion of the top cover 42 is 42C, and covers the upper end of the gas discharge groove 44 provided in the insulation cover 41, so that the gas discharge for discharging the gas discharged from the gas discharge valve 15 together with the gas discharge groove 44. A path 46 (see FIG. 7) is formed. Further, the central portion 42 </ b> C of the top cover 42 has an opening 43 for facilitating the drawing of the voltage detection line 20 and the temperature detection line 30, and a lid 45 for closing the opening 43.

  FIG. 5 is a plan view of the battery module 100 shown in FIG. 1 with the top cover 42 removed. FIG. 6 is an enlarged plan view of the battery module 100 shown in FIG. FIG. 7 is a cross-sectional view of battery module 100 along the short direction (Y-axis direction) of battery block 50 shown in FIG.

  As described above, the battery module 100 of the present embodiment includes a plurality of battery cells 10, a plurality of voltage detection lines 20 connected to the external terminals 11 of the battery cells 10, and a plurality of temperatures connected to the battery cells 10. And a detection line 30. The battery module 100 of the present embodiment is particularly characterized by the following configuration. 1stly, in the battery module 100 of this embodiment, the 1st laying part 70 which lays the several temperature detection line 30 along the one direction (X-axis direction) above the gas exhaust valve 15 of the some battery cell 10. FIG. Is provided. 2ndly, in the battery module 100 of this embodiment, the 2nd laying part 80 which lays the several voltage detection line 20 along one direction (X-axis direction) in the side of the 1st laying part 70 is provided. Yes. Hereinafter, these characteristic configurations will be described in detail.

  As shown in FIGS. 5 to 7, the first laying portion 70 extends along the one direction above the gas discharge valves 15 arranged in one direction that is the stacking direction (X-axis direction) of the plurality of battery cells 10. A plurality of temperature detection lines 30 are laid along one direction. More specifically, the first laying portion 70 includes a plurality of first support portions 71 provided adjacent to the gas exhaust valve 15 in one direction that is a stacking direction (X-axis direction) of the plurality of battery cells 10. Can be configured.

  The first support portion 71 is, for example, a plate-like member that is erected in the height direction (Z-axis direction) of the battery block 50 in parallel with the short direction (Y-axis direction) of the battery block 50. The 1st support part 71 mounts the several temperature detection line 30 in an upper end part, and supports it from the downward direction of the height direction of the battery block 50, for example. The first laying portion 70 includes a plurality of first support portions 71 provided at an interval in one direction that is a stacking direction (X-axis direction) of the plurality of battery cells 10, so that the plurality of battery cells 10. A plurality of temperature detection lines 30 are laid along the one direction (X-axis direction) above the gas discharge valve 15.

  In addition, the some 1st support part 71 can be provided as a partition of the insulation cover 41, for example. That is, when the battery module 100 includes the cover 40 that covers the upper surfaces 10 a of the plurality of battery cells 10, the first laying portion 70 can be provided on the cover 40. When the battery module 100 includes the gas discharge path 46 above the gas discharge valves 15 of the plurality of battery cells 10 as in the example illustrated in FIG. 7, the first laying portion 70 is provided in the gas discharge path 46. be able to.

  When the temperature detection line 30 laid on the first laying portion 70 is exposed to the gas discharge path 46 as in the illustrated example, a tube that covers the plurality of temperature detection lines 30 may be provided. Further, the material of the coating layer of the temperature detection line 30 is selected from materials that are excellent in heat resistance and chemical resistance from the viewpoint of reducing damage to the coating layer due to the gas discharged from the gas discharge valve 15 of the battery cell 10. It is preferable.

  As shown in FIG. 5 to FIG. 7, the second laying portion 80 is a gas discharge valve arranged side by side in the first laying portion 70, that is, in one direction that is the stacking direction (X-axis direction) of the plurality of battery cells 10. A plurality of voltage detection lines 20 are laid along the one direction along the one direction. More specifically, the second laying portion 80 includes a plurality of adjacently provided gas discharge valves 15 in the short direction (Y-axis direction) of the battery block 50, that is, in the longitudinal direction of the upper surface 10 a of the battery cell 10. The second support portion 81 can be used.

  The second support portion 81 is, for example, a plate-like member provided in parallel with the short side direction (Y axis direction) and the long side direction (X axis direction) of the battery block 50. For example, the second support portion 81 mounts the plurality of voltage detection lines 20 on the upper surface and supports the battery block 50 from below in the height direction. The second laying portion 80 includes a plurality of second support portions 81 provided at intervals in one direction that is the stacking direction (X-axis direction) of the plurality of battery cells 10. Thereby, the second laying portion 80 is, for example, in the lateral direction of the battery block 50, that is, in the longitudinal direction of the upper surface 10 a of the battery cell 10, on the side of the first laying portion 70, that is, the gas discharge valve 15 of the plurality of battery cells 10. A plurality of temperature detection lines 30 are laid sideways along one direction (X-axis direction) that is the longitudinal direction of the battery block 50.

  The plurality of second support portions 81 can be provided as partition walls of the insulation cover 41, for example. That is, when the battery module 100 includes the cover 40 that covers the upper surfaces 10 a of the plurality of battery cells 10, the second laying portion 80 can be provided on the cover 40. Further, in the illustrated example, the second laying portion 80 has a stacking direction (X-axis direction) of the plurality of battery cells 10 on both sides of the first laying portion 70 in the longitudinal direction (Y-axis direction) of the upper surface 10a of the battery cell 10. ) Along one direction.

  Further, in the illustrated example, the battery module 100 of the present embodiment includes a partition wall 41a between the second laying portion 80 and the external terminal 11 of the battery cell 10, and the first laying portion 70 and the second laying portion 80. And a partition wall 41b. As shown in FIG. 5, the partition wall 41 a has an opening 41 c through which the voltage detection line 20 is inserted, and the partition wall 41 b has an opening 41 d through which the temperature detection line 30 is inserted.

  Further, as shown in FIGS. 5 and 6, the insulation cover 41 is adjacent to the bus bar 60 to which the voltage detection line 20 connected to one external terminal 11 of each battery cell 10 is connected via the bus bar 60. The display unit 41e may be provided on the upper surface. On the display unit 41e, a number assigned to the battery cell 10 connected to the voltage detection line 20 via the bus bar 60 is displayed by, for example, marking.

  Hereinafter, the operation of the battery module 100 of the present embodiment will be described.

  The battery module 100 of the present embodiment is mounted on, for example, an electric vehicle such as a hybrid vehicle or a plug-in hybrid vehicle that travels with both an engine and a motor, or an electric vehicle that travels only with a motor. The battery module 100 supplies the electric energy accumulated in the plurality of battery cells 10 to an external device such as a motor via the external connection terminal 61 shown in FIGS. The electric energy supplied from the apparatus is stored in the plurality of battery cells 10.

  As described above, in the battery module 100 that includes the plurality of battery cells 10 and is mainly used for in-vehicle use, as the battery cells 10 are reduced in cost and size, more battery cells 10 tend to be used. . As the number of battery cells 10 used in the battery module 100 increases, the number of voltage detection lines 20 and temperature detection lines 30 connected to the battery cells 10 also increases. Therefore, as in the battery system described in Patent Document 1, for example, the voltage detection lines are assembled and arranged on the wiring surface of the battery block, and the voltage detection line and the temperature detection line are simply pulled out from the battery block without crossing each other. Then, the space on the wiring surface is insufficient, and the battery module may be difficult to downsize.

  On the other hand, the battery module 100 of the present embodiment is connected to the first laying portion 70 laying the plurality of temperature detection wires 30 connected to the plurality of battery cells 10 and the external terminals 11 of the plurality of battery cells 10. And a second laying portion 80 for laying a plurality of voltage detection lines 20 connected thereto. The first laying unit 70 extends the plurality of temperature detection lines 30 along one direction (X-axis direction) in which the gas discharge valves 15 of the plurality of battery cells 10 are arranged above the gas discharge valves 15 of the plurality of battery cells 10. Lay. In addition, the second laying unit 80 lays the plurality of voltage detection lines 20 on the side of the first laying unit 70 along the one direction (X-axis direction).

  With such a configuration, the battery module 100 according to the present embodiment is arranged along one direction in which the gas discharge valves 15 are arranged in a space above the gas discharge valve 15 that has not been conventionally used as a wiring space. A plurality of temperature detection lines 30 can be laid. Therefore, the temperature detection line 30 increased with the increase in the number of battery cells 10 used in the battery module 100 can be laid in the space above the gas exhaust valve 15, and the increased temperature detection line 30 is laid. It is no longer necessary to secure a new space for this purpose. Further, by laying the temperature detection line 30 in the space above the gas discharge valve 15, the insulating coating of the temperature detection line 30 is damaged by the gas discharged from the gas discharge valve 15, and the temperature detection lines 30 are short-circuited. However, the external short circuit of the battery cell 10 can be prevented.

  In the battery module 100 of the present embodiment, the plurality of voltage detection lines 20 are laid along the one direction in which the gas discharge valves 15 are arranged on the side of the first laying portion 70 by the second laying portion 80. Thus, the plurality of temperature detection lines 30 and the plurality of voltage detection lines 20 can be efficiently arranged. Therefore, according to the battery module 100 of the present embodiment, it is possible to cope with the increase in the voltage detection lines 20 and the temperature detection lines 30 accompanying the increase in the number of the battery cells 10 and to realize a reduction in the size of the battery module 100. Moreover, the voltage detection line laid in the 2nd laying part 80 is provided by providing the 2nd laying part 80 which lays the voltage detection line 20 in the side of the 1st laying part 70 provided above the gas exhaust valve 15. The wire 20 can be prevented from being directly exposed to the gas discharged from the gas discharge valve 15, and an external short circuit of the battery cell 10 can be prevented.

  In addition, the battery module 100 of the present embodiment includes a gas discharge path 46 above the gas discharge valves 15 of the plurality of battery cells 10, and the first laying portion 70 is provided in the gas discharge path 46. As described above, by providing the first laying portion 70 in the gas discharge path 46, the space in the gas discharge path 46 that has not been conventionally used for wiring can be effectively used to provide a plurality of temperature detection lines 30. Therefore, it is possible to effectively deal with the increase in the temperature detection lines 30 accompanying the increase in the battery cells 10.

  In addition, the battery module 100 of the present embodiment includes a cover 40 that covers the upper surfaces 10 a of the plurality of battery cells 10, and the first laying portion 70 and the second laying portion 80 are provided on the cover 40. Thus, by providing the first laying portion 70 and the second laying portion 80 on the cover 40, the first laying portion 70 is arranged above the gas discharge valves 15 of the plurality of battery cells 10 in the arrangement direction of the gas discharge valves 15 ( The second laying portion 80 can be easily formed along the arrangement direction (X-axis direction) of the gas exhaust valves 15 on the side of the first laying portion 70. . In addition, by forming the gas discharge path 46 with the cover 40, it is possible to easily provide the first laying portion 70 in the gas discharge path 46.

  Moreover, in the battery module 100 of the present embodiment, the battery cell 10 includes a rectangular upper surface 10a, a pair of external terminals 11 that are spaced apart from each other in the longitudinal direction (Y-axis direction) of the upper surface 10a, and the pair of external terminals 11a. And a gas discharge valve 15 provided between the external terminals 11. And the 2nd installation part 80 is in one direction which is the arrangement direction (X-axis direction) of the gas exhaust valve 15 on both sides of the 1st installation part 70 in the longitudinal direction (Y-axis direction) of the upper surface 10a of the battery cell 10. It is provided along.

  Accordingly, the plurality of voltage detection lines 20 connected to the external terminal 11 on one side in the longitudinal direction of the upper surface 10a of the battery cell 10 are laid on the second laying portion 80 provided on one side of the first laying portion 70. can do. A plurality of voltage detection lines 20 connected to the external terminals 11 on the other side in the longitudinal direction of the upper surface 10a of the battery cell 10 are laid on the second laying portion 80 provided on the other side of the first laying portion 70. be able to. That is, the voltage detection line 20 can be laid on both sides of the first laying portion 70 without straddling the first laying portion 70, and the voltage detection line 20 can be easily laid.

  In addition, the battery module 100 according to the present embodiment includes a partition wall 41 a between the second laying portion 80 and the external terminal 11 of the battery cell 10. Thereby, the external terminal 11 of the battery cell 10 and the second laying portion 80 are separated by the partition wall 41a, and the plurality of voltage detection lines 20 laid on the second laying portion 80 and the external terminal 11 of the battery cell 10 are connected. Can be isolated by a partition wall.

  In addition, the battery module 100 according to the present embodiment includes a partition wall 41 b between the first laying portion 70 and the second laying portion 80. Thereby, when gas is discharged from the gas discharge valve 15, the second laying portion 80 provided on the side of the first laying portion 70 from the first laying portion 70 provided above the gas discharge valve 15. The influence of the exhausted gas can be suppressed. More specifically, the gas discharged from the gas discharge valve 15 is shielded by the partition wall 41b, and adverse effects on the voltage detection line 20 laid on the second laying portion 80 can be avoided.

  Further, in the battery module 100 of the present embodiment, the partition wall 41a has an opening 41c through which the voltage detection line 20 is inserted. Therefore, when the voltage detection line 20 is laid, the voltage detection line 20 is laid from the outside to the inside of the second laying portion 80 through the opening 41c of the partition wall 41a, or the voltage detection line 20 is laid on the first laying portion 70. It can be pulled out from the inside to the outside. Therefore, the voltage detection line 20 can be easily laid.

  In the battery module 100 of the present embodiment, the partition wall 41 b has an opening 41 d through which the temperature detection line 30 is inserted. Therefore, when the temperature detection line 30 is laid, the temperature detection line 30 is laid from the outside to the inside of the first laying portion 70 through the opening 41d of the partition wall 41b, or the temperature detection line 30 is laid on the first laying portion 70. It can be pulled out from the inside to the outside. Therefore, the temperature detection line 30 can be easily laid.

  In the battery module 100 of the present embodiment, the plurality of voltage detection lines 20 are connected to the external terminals 11 of the individual battery cells 10. Therefore, according to the battery module 100 of the present embodiment, the voltage of each battery cell 10 can be detected via the plurality of voltage detection lines 20, and the failure of each battery cell 10 can be found early. It becomes possible.

  Moreover, when the insulation cover 41 has the display part 41e on the upper surface adjacent to the bus bar 60 connected to the voltage detection line 20, the display part 41e corresponding to the number assigned to the battery cell 10 in which the malfunction has occurred is displayed. You can refer to it. As a result, the battery cell 10 in which the problem has occurred can be easily identified, and the workability of the analysis investigation at the time of the problem can be improved and the time can be shortened.

  As described above, according to the battery module 100 of the present embodiment, the increase in the voltage detection lines 20 and the temperature detection lines 30 accompanying the increase in the number of battery cells 10 can be dealt with, and the battery module 100 can be downsized. be able to.

(Embodiment 2)
Next, Embodiment 2 of the battery module according to the present invention will be described with reference to FIGS. FIG. 8 is a cross-sectional view corresponding to FIG. 7 of the battery module 100A according to the present embodiment.

  The battery module 100A according to the present embodiment relates to the first embodiment described above in that the first laying portion 70A is formed in a groove shape having a depth in the height direction (Z-axis direction) of the battery block 50. Different from the battery module 100. Since other points of the battery module 100A according to the present embodiment are the same as those of the battery module 100 according to the first embodiment, the same portions are denoted by the same reference numerals and description thereof is omitted.

  As shown in FIG. 8, the first laying portion 70A of the battery module 100A according to the present embodiment includes a bottom wall 72 connected to a partition wall 41b between the first laying portion 70A and the second laying portion 80, and a bottom It is connected to the wall 72, has a side wall 73 facing the partition wall 41b, and is formed in a groove shape having an opening in the upper part. The width dimension of the first laying portion 70A in the short direction of the battery block 50, that is, the longitudinal direction (Y-axis direction) of the upper surface 10a of the battery cell 10 is the first laying in the height direction (Z-axis direction) of the battery block 50. It is smaller than the depth dimension of the portion 70A. The width dimension of the first laying portion 70A can be, for example, not less than the diameter of the temperature detection line 30 and less than twice the diameter.

  According to the battery module 100A according to the present embodiment, not only the same effect as the battery module 100 according to the first embodiment described above can be obtained, but also the gas discharged from the gas discharge valve 15 by the bottom wall 72 and the side wall 73 can be obtained. It can shield and can avoid the bad influence by the gas with respect to the temperature detection line 30 more reliably. The plurality of temperature detection lines 30 laid on the first laying portion 70A can be arranged in the height direction of the battery block 50, and the dimension of the first laying portion 70A in the longitudinal direction of the upper surface 10a of the battery cell 10 Can be prevented, and the function of the gas discharge path 46 can be prevented from being impaired. Further, the plurality of temperature detection lines 30 can be more reliably held on the first laying portion 70A, and the temperature detection lines 30 can be easily laid.

(Embodiment 3)
Next, Embodiment 3 of the battery module according to the present invention will be described with reference to FIGS. 9 to 11 with reference to FIGS. FIG. 9 is a cross-sectional view corresponding to FIG. 7 of the battery module 100B according to the present embodiment.

  The battery module 100B according to the present embodiment is different from the battery module 100 according to the first embodiment described above in that a gas discharge detection circuit 90 is provided in the gas discharge valve 15 of the battery cell 10. Since other points of the battery module 100 according to the present embodiment are the same as those of the battery module 100 according to the first embodiment described above, the same portions are denoted by the same reference numerals and description thereof is omitted.

  The gas discharge detection circuit 90 has, for example, a configuration in which a wiring pattern is formed on a resin film, and is disposed on the gas discharge valve 15 of the battery cell 10 or directly above the gas discharge valve 15. In the gas discharge detection circuit 90, for example, the wiring pattern is broken and the conduction state is changed or the resistance value is changed by the gas discharged from the gas discharge valve 15 of the battery cell 10. By detecting the change in the conduction state or the change in resistance value of the gas discharge detection circuit 90, it is possible to detect the presence or absence of the cleavage of the gas discharge valve 15 of the battery cell 10.

  FIG. 10 is a schematic block diagram of a battery system 200 including the battery module 100B shown in FIG.

  In the example shown in FIG. 10, the battery system 200 includes a plurality of battery modules 100B, a battery control unit (BCU) 210, a host controller 220, and a safety device 230. The plurality of battery modules 100B are connected to the inverter INV of the motor M via the safety device 230. The safety device 230 includes, for example, a safety plug and a fuse, and stops the supply of power from the plurality of battery modules 100B to the inverter INV in an emergency.

  The BCU 210 is connected to the battery module 100B via the temperature detection line 30, the voltage detection line 20, and the signal line L1. In the block diagram shown in FIG. 10, the voltage detection line 20 is not shown. Further, the BCU 210 is connected to the gas discharge detection circuit 90 via the signal line L2, and detects the continuity of the gas discharge detection circuit 90 or a change in the resistance value to detect the gas discharge valve 15 of the battery cell 10 being cleaved. Detect the presence or absence.

  The BCU 210 is connected to the host controller 220 via the signal line L4, and transmits an abnormality detection flag and a control signal related to power suppression to the host controller 220. When the host controller 220 is connected to the inverter INV via the signal line L5 and receives an abnormality detection flag or a control signal related to power suppression from the BCU 210, the host controller 220 transmits a control signal related to power suppression to the inverter INV and supplies it to the inverter INV. Suppressed power. Further, the BCU 210 may be configured to be able to suppress power supplied to the inverter INV from the plurality of battery modules 100B connected via the signal line L3.

  FIG. 11 is a flowchart for explaining the operation of battery system 200 shown in FIG.

  When the battery system 200 starts to operate, in step S1, the BCU 210 measures the resistance value of the thermistor via the temperature detection line 30 and the signal line L1, and detects the temperature of the battery cell 10. Further, the battery system 200 measures the conduction state or resistance value of the gas discharge detection circuit 90 via the signal line L2 by the BCU 210 and detects the voltage of the battery cell 10 via the voltage detection line 20.

  Next, in step S <b> 2, the battery system 200 determines whether there is an abnormality based on the resistance value of the thermistor detected by the BCU 210 and the conduction state or resistance value of the gas discharge detection circuit 90. Specifically, the BCU 210 is abnormal if, for example, the resistance value of the thermistor is equal to or lower than a predetermined threshold value, and the conduction state of the gas discharge detection circuit 90 is normal or the resistance value is equal to or lower than the predetermined threshold value. It is determined that there is no (N), and the process returns to step S1.

  In step S2, for example, the BCU 210 determines that there is an abnormality (Y) when the resistance value of the thermistor exceeds a predetermined threshold value. Such an abnormal increase in the resistance value of the thermistor is laid on the first laying portion 70 above the gas discharge valve 15 by the gas discharged from the battery container 12 when the gas discharge valve 15 of the battery cell 10 is cleaved. This is because the temperature detection line 30 is considered to be broken or damaged. If the BCU 210 determines that there is an abnormality (Y), the process proceeds to step S3.

  Thus, in the battery module 100B of the present embodiment and the battery system 200 using the same, the temperature detection line 30 also functions as an abnormality detection line that detects the cleavage of the gas discharge valve 15 of the battery cell 10.

  In addition, when the battery system 200 detects that the conduction state of the gas discharge detection circuit 90 is abnormal or the BCU 210 detects that the resistance value exceeds a predetermined threshold in step S2, the battery system 200 has an abnormality. (Y) is determined. The abnormality in the conduction state of the gas discharge detection circuit 90 and the increase in resistance value are caused by the wiring pattern of the gas discharge detection circuit 90 being deformed, disconnected or altered by the gas discharged from the gas discharge valve 15. This is because it is considered. If the BCU 210 determines that there is an abnormality (Y), the process proceeds to step S3.

  In step S3, the BCU 210 transmits a control signal related to power suppression to the battery module 100B via the signal line L3, and transmits an abnormality detection flag and a control signal related to power suppression to the host controller 220 via the signal line L4. Thereby, the electric power supplied to the inverter INV of the motor M is suppressed by the host controller 220 and the battery module 100B, and for example, the vehicle can be stopped safely.

  As described above, according to the battery module 100B of the present embodiment and the battery system 200 using the same, the same effects as those of the battery module 100 according to the first embodiment described above can be obtained, and the battery cell 10 It is possible to detect the cleavage of the gas discharge valve 15 and improve the safety when supplying power.

  The embodiment of the present invention has been described in detail with reference to the drawings, but the specific configuration is not limited to this embodiment, and there are design changes and the like without departing from the gist of the present invention. They are also included in the present invention.

10 battery cell 10a upper surface 11 external terminal 15 gas discharge valve 20 voltage detection line 30 temperature detection line 40 cover 41a partition wall 41b partition wall 41c opening portion 41d opening portion 46 gas discharge path 70 first laying portion 80 second laying portion 100 battery module 100A Battery module 100B Battery module

Claims (9)

A battery module comprising: a plurality of battery cells; a plurality of voltage detection lines connected to external terminals of the battery cells; and a plurality of temperature detection lines connected to the battery cells,
The plurality of battery cells are arranged such that gas discharge valves provided on the upper surface of the battery cells are arranged in one direction,
A first laying portion for laying the plurality of temperature detection lines along the one direction is provided above the gas discharge valves of the plurality of battery cells;
A battery module, wherein a second laying portion for laying the plurality of voltage detection lines along the one direction is provided on a side of the first laying portion. A gas discharge path is provided above the gas discharge valve of the plurality of battery cells,
The battery module according to claim 1, wherein the first laying portion is provided in the gas discharge path. A cover for covering the upper surface of the plurality of battery cells;
The battery module according to claim 1, wherein the first laying portion and the second laying portion are provided on the cover. The battery cell includes the rectangular upper surface, a pair of external terminals that are spaced apart in the longitudinal direction of the upper surface, and the gas discharge valve provided between the pair of external terminals. And
2. The battery module according to claim 1, wherein the second laying portion is provided on both sides of the first laying portion in the longitudinal direction along the one direction.   The battery module according to claim 4, further comprising a partition wall between the second laying portion and the external terminal.   The battery module according to claim 4, further comprising a partition wall between the first laying portion and the second laying portion.   The battery module according to claim 5, wherein the partition wall has an opening through which the voltage detection line is inserted.   The battery module according to claim 6, wherein the partition wall has an opening through which the temperature detection line is inserted.   The battery module according to claim 1, wherein the plurality of voltage detection lines are connected to the external terminals of the individual battery cells.

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