JP2016072181A - Bus bar module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a bus bar module capable of improving maintainability in the case of a failure in a battery monitoring circuit.SOLUTION: A bus bar module 20 fitted to a battery assembly 12 in which a plurality of battery cells 13 are arrayed, includes: a plurality of bus bars 22 for connecting electrode terminals of neighboring battery cells 13 in series; a battery monitoring circuit 116 for detecting a terminal voltage of the battery cell 13; a holding member 24 for holding the bus bars 22 and the battery monitoring circuit 116; a plurality of voltage detection lines 64 electrically connecting the plurality of bus bars 22 and the battery monitoring circuit 116; and a communication line 114 electrically connecting the neighboring battery monitoring circuits 116. In the holding member 24, the battery monitoring circuit 116 including the communication line 114 is provided in a removable manner and the voltage detection line 64 is wired in such a manner that the removal of the battery monitoring circuit 116 is not disturbed.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a bus bar module attached to a battery assembly in which a plurality of battery cells are arranged.

  Conventionally, for example, there is a bus bar module in which cell terminals extending toward each other from electrode terminals of a plurality of battery cells of a battery assembly are provided, a substrate is disposed on the cell terminals, and the cell terminals and the substrate are joined to each other. (For example, refer to Patent Document 1). The bus bar module electrically connects an arithmetic processing device for detecting a terminal voltage of a battery cell, a voltage detection circuit for electrically connecting a plurality of cell terminals and the arithmetic processing device, and an adjacent voltage detection circuit on the substrate. And a cable to be connected. In addition, the board | substrate, the arithmetic processing apparatus, the voltage detection circuit, and the cable in patent document 1 are respectively corresponded to the holding member, battery monitoring circuit, voltage detection line, and communication line as used in this specification.

JP 2010-160930 A

  According to the bus bar module of Patent Document 1, the battery monitoring circuit is fixedly installed on the substrate. For this reason, when the battery monitoring circuit fails, the entire bus bar module must be attached and detached. For this reason, when replacing the bus bar module, there is a high possibility that the operator will accidentally contact the high voltage section, and the replacement cost of the battery monitoring circuit will be high. There was a problem of low. Therefore, the problem to be solved by the present invention is to provide a bus bar module capable of improving the maintainability at the time of failure of the battery monitoring circuit.

  1st invention is a bus-bar module attached to the battery assembly in which the some battery cell was arranged, Comprising: The some bus bar which connects the electrode terminal of the said adjacent battery cell in series, and the terminal voltage of the said battery cell A battery monitoring circuit that detects the battery, a holding member that holds the bus bar and the battery monitoring circuit, a plurality of voltage detection lines that electrically connect the plurality of bus bars and the battery monitoring circuit, and the adjacent battery monitoring A communication line that electrically connects the circuit, and the holding member is detachably provided with the battery monitoring circuit including the communication line, and the voltage detection line so as not to prevent the battery monitoring circuit from being attached or detached. Is wired. According to this configuration, the holding member is detachably provided with the battery monitoring circuit including the communication line, and the voltage detection line is wired so as not to prevent the battery monitoring circuit from being attached or detached. That is, the high voltage side component including the voltage detection line is disposed on the lower layer side, and the low voltage side component including the battery monitoring circuit and the communication line is disposed on the upper layer side. Therefore, when the battery monitoring circuit fails, the battery monitoring circuit can be attached and detached while the bus bar module is attached to the battery assembly. For this reason, it is not necessary to attach or detach the bus bar module to the battery assembly. Therefore, maintainability at the time of failure of the battery monitoring circuit can be improved. As a result, the replacement cost of the battery monitoring circuit can be reduced.

  In a second aspect based on the first aspect, the voltage detection line comprises a lead wire, and a wiring guide portion for guiding the voltage detection line is provided on a surface of the holding member on the battery monitoring circuit side. Yes. According to this configuration, the voltage detection line can be guided by the wiring guide portion provided on the holding member. For this reason, the fluctuation | variation of the voltage detection line by a vibration etc. can be suppressed and damage, such as a disconnection of the voltage detection line by the fluctuation | variation, can be suppressed.

  In a third aspect based on the second aspect, the wiring guide portion comprises a groove-shaped portion that accommodates the voltage detection line. According to this configuration, the voltage detection line can be accommodated in the wiring guide portion. For this reason, a voltage detection line can be wired compactly.

  In a fourth aspect based on the third aspect, a cover member is provided on the surface of the holding member on the battery monitoring circuit side so as to cover the wiring guide portion including a groove-shaped portion. With this configuration, the cover member can prevent the voltage detection line from coming off from the wiring guide portion. Moreover, the voltage detection line accommodated in the wiring guide part can be protected by the cover plate. For this reason, the voltage detection line after wiring does not get in the way, and interference between the voltage detection line and other components can be prevented.

  According to a fifth invention, in any one of the first to fourth inventions, the holding member includes a plurality of wiring connection portions that connect the voltage detection lines and the battery monitoring circuit, and the plurality of wirings The connecting portions are arranged in the column direction of the battery cells and are offset to one side in a direction intersecting the column direction of the battery cells. According to this configuration, a wide wiring space can be formed on the side of the holding member opposite to the one-sided side of the plurality of wiring connection portions. For this reason, handling of a plurality of voltage detection lines can be facilitated.

  According to a sixth invention, in any one of the first to fifth inventions, the holding member is provided with a temperature sensor for detecting a temperature of the battery cell, and the temperature sensor is a sensor holder attached to the holding member. A sensor case provided in the sensor holder so as to be movable back and forth in the axial direction; a sensor element built in the sensor case; and the sensor case interposed between the sensor holder and the sensor case. And an elastic member for biasing in the advancing direction. According to this configuration, in the temperature sensor provided in the holding member, the sensor case is elastically pressed against the battery cell by the elastic force of the elastic member interposed between the sensor case and the sensor holder. For this reason, the temperature of the battery cell can be accurately detected by the temperature sensor.

  According to a seventh invention, in any one of the first to fifth inventions, the holding member is configured by a holding member main body that holds the battery monitoring circuit, and a bus bar holding portion that holds the bus bars. The bus bar holding part is connected to the holding member body part via a connecting mechanism so as to be movable in the row direction of the battery cells. According to this configuration, the bus bar holding portion is connected to the holding member main body portion of the holding member via the connecting mechanism so as to be movable in the row direction of the battery cells. For this reason, it is possible to absorb the relative displacement between the holding member main body portion of the holding member and the bus bar holding portion due to the expansion and contraction of the battery assembly in the column direction. In addition, the expansion and contraction in the column direction of the battery assembly refers to the dimension in the column direction of the battery assembly that occurs due to the pitch error between adjacent battery cells, the temperature change of the battery cell itself, the temperature change of the ambient atmosphere of the battery cell, etc. It is a change.

  According to an eighth aspect based on the seventh aspect, the connecting mechanism includes a rail portion provided on one member of the holding member main body portion and the bus bar holding portion, and a rail portion provided on the other member and the rail. And a hook portion movably hooked to the portion. According to this structure, the holding member main body part of the holding member and the bus bar holding part can be easily connected by engaging the hook part with the rail part of the connecting mechanism.

  According to a ninth invention, in the seventh or eighth invention, the bus bar holding part is provided with a temperature sensor for detecting a temperature of the battery cell, and the temperature sensor is provided for the bus bar holding part with respect to the holding member main body part. It is arrange | positioned adjacent to the connection part. According to this configuration, the amount of displacement of the temperature sensor due to rattling of the coupling mechanism can be reduced.

1 is a perspective view showing a bus bar module according to Embodiment 1. FIG. It is a top view which shows a bus-bar module. FIG. 3 is a cross-sectional view taken along line III-III in FIG. 2. It is a top view which decomposes | disassembles and shows a 1st assembly. It is a top view which shows a 1st assembly. It is a top view which shows the peripheral part of the terminal block of a 1st assembly. FIG. 7 is a cross-sectional view taken along line VII-VII in FIG. 6. FIG. 8 is a cross-sectional view taken along line VIII-VIII in FIG. 6. FIG. 7 is a cross-sectional view taken along line IX-IX in FIG. 6. It is a top view which shows the peripheral part of a connection mechanism. It is a XI-XI line sectional view taken on the line of FIG. It is a perspective view which decomposes | disassembles and shows a connection mechanism. It is a top view which shows a 2nd assembly. It is sectional drawing which shows the peripheral part of a temperature sensor. It is sectional drawing which decomposes | disassembles and shows a bus-bar holding frame and a temperature sensor. It is a perspective view which decomposes | disassembles and shows a bus-bar holding frame and a temperature sensor. It is a bottom view which shows a monitoring circuit unit. It is a top view which shows the 1st assembly concerning Embodiment 2. FIG. It is sectional drawing which shows the temperature sensor concerning Embodiment 3. It is sectional drawing which shows the temperature sensor concerning Embodiment 4. It is sectional drawing which shows the temperature sensor concerning Embodiment 5.

  DESCRIPTION OF EMBODIMENTS Hereinafter, embodiments for carrying out the present invention will be described with reference to the drawings.

[Embodiment 1]
Embodiment 1 will be described. In the present embodiment, a bus bar module of a battery module used as a power supply device for a hybrid vehicle is illustrated. 1 is a perspective view showing the bus bar module, FIG. 2 is a top view showing the bus bar module, and FIG. 3 is a cross-sectional view taken along the line III-III in FIG. For convenience of explanation, the direction of the bus bar module is determined as indicated by arrows in each figure.

  As shown in FIG. 1, the battery module 10 includes a battery assembly 12 and a bus bar module 20. The battery assembly 12 includes a plurality of (for example, 14) battery cells 13 as secondary batteries. In FIG. 1, some of the 14 battery cells 13 are shown. For example, a lithium ion battery is used as the battery cell 13. The cell body 14 of the battery cell 13 is formed in a rectangular parallelepiped shape with the front-rear direction as an end measure and the left-right direction as a length. A pair of left and right electrode terminals 15 are arranged symmetrically on both left and right ends of the upper surface of the cell body 14 (see FIG. 3). The electrode terminal 15 is made of a metal having conductivity and is formed in a cylindrical shape. One electrode terminal 15 of the left and right electrode terminals 15 (same reference numerals) is a positive electrode terminal 15, and the other electrode terminal 15 is a negative electrode terminal 15.

  As shown in FIG. 3, an insulating resin spacer 16 and a conductive metal contact plate 17 are fitted to the electrode terminal 15. The contact plate 17 is disposed so as to overlap the spacer 16. A safety valve 18 is provided at the center of the upper surface of the cell body 14. The safety valve 18 is normally closed, and when the internal pressure of the cell body 14 becomes an abnormal pressure, the safety valve 18 is opened to discharge the gas in the cell body 14.

  As shown in FIG. 1, the plurality of battery cells 13 are arranged side by side in the front-rear direction, that is, in a row, and are held together by a restraining member (not shown). Adjacent battery cells 13 are arranged such that the poles of a pair of electrode terminals 15 (see FIG. 3) are in opposite directions. The column direction of the battery cells 13 of the battery assembly 12 corresponds to the front-rear direction, and the direction intersecting the column direction corresponds to the left-right direction.

  As shown in FIG. 1, the bus bar module 20 is disposed so as to overlap the battery assembly 12. The bus bar module 20 includes a plurality of bus bars 22 that connect a plurality of battery cells 13 of the battery assembly 12 in series. The bus bar 22 is made of metal having conductivity. The bus bar 22 is formed in a band plate shape that lengthens the front-rear direction. The bus bar 22 has a pair of front and rear mounting holes 22a. The attachment hole 22a is formed so as to be fitted to the electrode terminal 15 (see FIG. 3) of the battery cell 13. The plurality of bus bars 22 are arranged symmetrically in two rows on the left and right. The bus bar 22 on the left side and the bus bar 22 on the right side are arranged with a phase shifted by 1/2 pitch in the front-rear direction (see FIG. 2). Seven bus bars 22 are arranged in the left column, and eight bus bars 22 are arranged in the right column. The right frontmost and rearmost bus bars 22 (with the same reference numerals) correspond to terminal fittings, the length in the front-rear direction is ½ of the length of the other bus bars 22, and the mounting hole 22a is 1 It is formed as a piece.

  Each bus bar 22 is held on one plane by a holding member 24. The holding member 24 includes a main member 26, a plurality of left frame members 28 arranged on the left side of the main member 26, and a plurality of right frame members 30 arranged on the right side of the main member 26 ( (See FIG. 2). The main member 26 and the frame members 28 and 30 are each made of resin. The main member 26 is formed in a long shape extending in the front-rear direction. The main member 26 corresponds to a “holding member main body” in this specification. The frame members 28 and 30 correspond to the “bus bar holding portion” in this specification.

  The left frame member 28 holding the bus bar 22 is referred to as a left bus bar holder 32. Further, the right frame member 30 holding the bus bar 22 is referred to as a right bus bar holder 34. A structure in which the bus bar holders 32 and 34 are assembled to the main member 26 is referred to as a first assembly 36 (see FIG. 5). 4 is an exploded top view showing the first assembly, FIG. 5 is a plan view showing the first assembly, FIG. 6 is a top view showing the peripheral portion of the terminal block of the first assembly, and FIG. FIG. 8 is a sectional view taken along line VIII-VIII in FIG. 6, and FIG. 9 is a sectional view taken along line IX-IX in FIG.

  As shown in FIG. 7, the main member 26 is formed in a reverse channel shape in a front view, and has an upper wall portion 38 and left and right side wall portions 40. The upper wall portion 38 and the side wall portions 40 extend over the entire length of the main member 26. A pedestal 40a is formed at the lower end of each side wall 40 so as to project outward in a flange shape. Sealing members 42 having elasticity are attached to the lower surfaces of both pedestals 40a by bonding. The seal member 42 has a quadrangular cross section and extends over the entire length of the pedestal portion 40a in the front-rear direction. The hollow portion 44 that opens the lower surface of the main member 26 is a gas discharge passage 44 (same as the hollow portion) that exhausts the gas released from the safety valve 18 (see FIG. 3) of each battery cell 13. . That is, the main member 26 also serves as a gas discharge duct.

  As shown in FIG. 4, both front and rear wiring housing recesses 46 formed of elongated rectangular grooves extending in the front-rear direction are formed at the center in the left-right direction of the upper surface of the upper wall portion 38 of the main member 26. Yes. The wiring accommodating recess 46 is formed in a shallow bottom shape (see FIGS. 7 and 9). Further, on the upper surface of the upper wall portion 38, there is formed a wiring holding groove portion 48 formed of a groove-like portion extending outward (left or right) from both the wiring accommodating recesses 46 (see FIGS. 8 and 9). . The wiring holding groove portion 48 is formed in a U-shaped groove shape. The wiring holding groove 48 is formed so as to correspond to a wiring path closer to the bus bar 22 side of the voltage detection line 64 described later. The wiring accommodating recess 46 and the wiring holding groove 48 correspond to the “wiring guide part” in the present specification.

  On the upper surface of the upper wall portion 38, there are formed front and rear terminal block arrays 50 located on one side (for example, the right side) of the wiring housing recess 46. The terminal block row 50 has a plurality of (9 in this embodiment) terminal blocks 52 arranged in the front-rear direction (see FIGS. 6 to 8). That is, the plurality of terminal blocks 52 are shifted to one side (right side) in the direction (left-right direction) intersecting the column direction (front-rear direction) of the battery cells 13 and arranged in one row in the column direction (front-rear direction) of the battery cells 13. Is arranged. The terminal block 52 corresponds to a “wiring connection portion” in this specification.

  As shown in FIG. 6 and FIG. 7, two sets of front and rear locking pieces 55 are formed on the upper surface of the upper wall portion 38 so as to form a pair of left and right positions located on the left and right sides of the terminal base row 50. The locking piece 55 is formed so as to be elastically deformable in the left-right direction, so-called flexural deformation. The locking piece 55 has a locking claw portion 55a that protrudes outward at the upper end portion. A plurality of columnar positioning projections 57 adjacent to the periphery of the wiring housing recess 46 protrude in a distributed manner on the upper surface of the upper wall portion 38 (see FIG. 4).

  As shown in FIG. 4, on the left side of the main member 26 of the holding member 24, a plurality of left-side busbar holders 32 are arranged in the front-rear direction. The left bus bar holding body 32 includes a left frame member 28 and a left bus bar 22. As shown in FIGS. 6 and 7, the left frame member 28 includes a main frame portion 60 and a sensor mounting portion 62 that are adjacent to each other on the left and right. The main frame portion 60 is formed in a rectangular frame shape that opens up and down, and the left bus bar 22 is held horizontally in the frame. For example, the bus bar 22 is attached to the main frame 60 by a snap fit. On the right side of the main frame portion 60, a number of sensor mounting portions 62 (two front and rear in the present embodiment) corresponding to the mounting holes 22a of the left bus bar 22 are arranged (see FIG. 4). The sensor mounting portion 62 will be described later.

  A plurality of right-side bus bar holders 34 are arranged on the right side of the holding member 24 in the front-rear direction. The right bus bar holder 34 includes a right frame member 30 and a right bus bar 22. The right frame member 30 is formed in a rectangular frame shape that opens up and down, and the right bus bar 22 is held horizontally in the frame. For example, the bus bar 22 is attached to the right frame member 30 by snap fitting.

  One end of a voltage detection line 64 is connected to each bus bar 22 of the bus bar holders 32 and 34. The voltage detection wire 64 is a lead wire in which a conductive core wire is covered with an insulating coating material. The voltage detection line 64 has a connection terminal 64a at the other end. In the left bus bar holding body 32, the voltage detection line 64 is held by fitting in a longitudinal groove-like wiring recess 66 formed in the left frame member 28 and between a pair of front and rear wiring holding pieces 67. Has been. The wiring recess 66 and the wiring holding piece 67 of the left frame member 28 are shown in FIGS. Further, in the right bus bar holder 34, the voltage detection line 64 is held by fitting in a vertical groove-shaped wiring recess 68 formed in the right frame member 30.

  The frame members 28, 30 of the bus bar holders 32, 34 are connected to the main member 26 so as to be movable in the front-rear direction, that is, in the row direction of the battery cells 13, via the connection mechanism 70. The left and right connecting mechanisms 70 are symmetrical and have the same basic configuration, so the left connecting mechanism 70 will be described, and the description of the right connecting mechanism 70 will be omitted. 10 is a top view showing the periphery of the coupling mechanism, FIG. 11 is a cross-sectional view taken along the line XI-XI in FIG. 10, and FIG. 12 is an exploded perspective view showing the coupling mechanism. In FIG. 11, the two-dot chain line 32 indicates the left bus bar holding body 32 before being connected to the main member 26. In FIG. 12, the bus bar 22 and the voltage detection line 64 are omitted.

  As shown in FIG. 12, the coupling mechanism 70 includes a rail portion 72 and a hook portion 74. The rail portion 72 is connected to the outside (left side) of the left side wall portion 40 of the main member 26 via a plurality of connecting pieces 72a. The rail portion 72 is formed in a strip shape extending in the front-rear direction, and extends over the entire length of the side wall portion 40 in the front-rear direction. The rail portion 72 is parallel to the side wall portion 40. The rail part 72 is formed by integral molding with the main body member 26, for example.

  The hook portion 74 has an inverted L-shaped piece and is provided at the upper end portion of the side plate portion 28a on the main member 26 side (right side) of the left frame member 28. For example, the hook portion 74 is formed on the frame member 28 by integral molding. The hook portion 74 is disposed adjacent to the right side of the sensor mounting portion 62. That is, the frame member 28 is provided with a number of hook portions 74 corresponding to the sensor mounting portions 62. Further, a drooping retaining piece 76 is formed at the upper end portion of the side plate portion 28a. The retaining piece 76 is formed so as to be elastically deformed in the left-right direction, so-called flexural deformation. The retaining piece 76 has a retaining claw 76 a that protrudes toward the main member 26 (right side) at the upper end.

  As shown in FIG. 11, the hook portion 74 is hooked to the rail portion 72 so as to be slidable in the front-rear direction from above. Accordingly, the hook portion 74 is prevented from coming off by engaging the retaining pawl portion 76a of the retaining piece 76 with the snap fit using elastic deformation below the rail portion 72. The hook portion 74 is fitted between the side wall portion 40 and the rail portion 72 with almost no gap in the left-right direction. In this way, the frame member 28 is connected to the main member 26 so as to be movable in the front-rear direction (see FIG. 10). The hook portion 74 corresponds to a connecting portion of the left frame member 28 with respect to the main member 26.

  In the rail portion 72, the connecting pieces 72 a that are adjacent to each other with the hook portion 74 in between are arranged at an interval that secures a sliding amount necessary for sliding the frame member 28 along with the expansion and contraction of the battery assembly 12 in the column direction. Has been. Further, the connecting pieces 72a adjacent to each other in the front-rear direction with the hook portion 74 interposed therebetween are arranged so as to limit excessive sliding beyond the required slide amount of the hook portion 74 during transportation or assembly.

  As shown in FIG. 5, frame members 38 and 30 of a plurality of left and right bus bar holders 32 and 34 are connected to the main member 26 via a connecting mechanism 70. As shown in FIG. 6, the connection terminals 64a of the voltage detection lines 64 are attached to the terminal blocks 52 of the terminal block array 50 of the main member 26 (see FIGS. 7 and 8). Further, the bus bar 22 side portion and the terminal block 52 side portion of the voltage detection line 64 are held by fitting the main member 26 to the wiring holding groove portion 48 (see FIGS. 7 to 9). Further, the remaining part of the voltage detection line 64 is accommodated in the wiring accommodating recess 46 of the main member 26 (see FIGS. 7 and 9).

  FIG. 13 is a plan view showing the second assembly. As shown in FIG. 13, the second assembly 78 is obtained by assembling a cover plate 80 and a temperature sensor 82 to the first assembly 36 (see FIG. 5). The cover plate 80 is made of resin and is formed in a square plate shape. There are three types of cover plates 80, long, medium and short, with different lengths in the front-rear direction. The long cover plate 80 is disposed in front of the terminal block array 50 on the rear side of the main member 26. Further, the short cover plates 80 are respectively disposed behind the both terminal rows 50 of the main member 26. The cover plate 80 having an intermediate length is disposed in front of the terminal block array 50 on the front side of the main member 26.

  The cover plates 80 are arranged in a line in the front-rear direction so as to overlap the upper wall portion 38 of the main member 26. A plurality of positioning holes 80 a are formed in the outer periphery of the cover plate 80. The positioning hole 80a is fitted to the positioning projection 57 of the upper wall portion 38 of the main member 26 from above. Thereby, the movement of the cover plate 80 in the horizontal direction, that is, the front-rear direction and the left-right direction is restricted. Each cover plate 80 partially covers the wiring housing recess 46 and the wiring holding groove 48. The cover plate 80 corresponds to a “cover member” in this specification.

  14 is a cross-sectional view showing the periphery of the temperature sensor, FIG. 15 is an exploded cross-sectional view showing the bus bar holding frame and the temperature sensor, and FIG. 16 is a perspective view. As shown in FIG. 16, the sensor attachment portion 62 of the left frame member 28 is formed between the side plate portion 28a on the main member 26 side and the side plate portion 60a of the main frame portion 60 parallel to the side plate portion 28a. ing. The sensor attaching part 62 attaches the temperature sensor 82 with the both side plates 28a, 60a as the left and right side walls. A bottom plate portion 84 (see FIG. 15) is installed between the lower end portions of the side plate portions 28a and 60a. As shown in FIG. 15, a circular opening hole 84 a is formed in the bottom plate portion 84. A pair of front and rear sensor holding pieces 85 are raised in parallel on both front and rear ends of the bottom plate portion 84. The sensor holding piece 85 is formed so that it can be elastically deformed in the front-rear direction (left-right direction in FIG. 15), so-called bending deformation. The sensor holding piece 85 has a claw portion 85a that protrudes in the opposite direction at the upper end portion.

  The temperature sensor 82 detects the temperature of the battery cell 13 (see FIG. 3), and includes a sensor holder 87, a sensor case 89, a spring 91, and a sensor element 102. The sensor holder 87 is made of resin and has a reverse channel shape when viewed from the side (see FIG. 16). The sensor holder 87 has an upper plate portion 93 and front and rear side plate portions 94. The both side plate portions 94 are formed so as to be elastically deformed in the front-rear direction (left-right direction in FIG. 15), so-called bending deformation. The both side plate portions 94 have engaging claw portions 94a that protrude in the opposite direction at the lower end portion. The upper plate portion 93 is formed with a hollow cylindrical guide tube portion 95 extending downward. The sensor holder 87 is formed so that it can be fitted to the sensor mounting portion 62 of the left frame member 28 from above.

  The sensor case 89 is made of metal and is formed into a bottomed cylindrical shape by press molding. The sensor case 89 includes a bottom wall portion 97, a small diameter cylindrical portion 98, a stepped portion 99, and a large diameter cylindrical portion 100. The small diameter cylindrical portion 98, the stepped portion 99, and the large diameter cylindrical portion 100 are formed in a stepped cylindrical shape. In the sensor case 89, the sensor element 102 is built in a state where it contacts the bottom wall portion 97. The bottom wall portion 97 is a temperature measuring portion that comes into contact with an object to be measured, that is, the cell body 14 (see FIG. 3) of the battery cell 13.

  The sensor element 102 is a thermistor element. One end of two temperature detection lines 103 is connected to the sensor element 102. The temperature detection wire 103 is formed of a lead wire in which a conductive core wire is covered with an insulating coating material. A sealing resin 104 is potted in the small diameter cylindrical portion 98 of the sensor case 89. Thereby, the sensor element 102 is sealed.

  The large-diameter cylindrical portion 100 of the sensor case 89 is fitted between the side plate portions 94 of the sensor holder 87 from below. Thus, the sensor case 89 is assembled to the sensor holder 87 so as to be movable back and forth in the axial direction (vertical direction) by snap-fit using elastic deformation of the side plate portions 94. When the stepped portion 99 of the sensor case 89 comes into contact with the engaging claw portions 94 a of the side plate portions 94 of the sensor holder 87, the sensor case 89 is prevented from coming off. The large-diameter cylindrical portion 100 of the sensor case 89 is fitted between the side plate portions 94 of the sensor holder 87 with almost no gap. Further, both temperature detection lines 103 of the sensor element 102 are drawn out through the guide cylinder portion 95 of the sensor holder 87. The temperature detection line 103 is inserted into the guide tube portion 95 with almost no gap.

  The spring 91 is made of a metal coil spring. The spring 91 is interposed between the sensor holder 87 and the sensor case 89. The lower end portion of the spring 91 is fitted into the large diameter cylindrical portion 100 of the sensor case 89. Further, the guide tube portion 95 of the sensor holder 87 is fitted in the upper end portion of the spring 91. The lower end surface of the spring 91 is in contact with the stepped portion 99 of the sensor case 89. The stepped portion 99 serves as both a receiving portion of the spring 91 and a locking portion for snap fitting of the sensor holder 87. The upper end surface of the spring 91 is in contact with the upper plate portion 93 of the sensor holder 87. Both temperature detection lines 103 of the sensor element 102 are inserted into the spring 91. The spring 91 urges the sensor case 89 in the advancing direction (downward) with respect to the sensor holder 87. The spring 91 corresponds to an “elastic member” in this specification.

  The guide tube portion 95 of the sensor holder 87 and the large diameter tube portion 100 of the sensor case 89 can guide the spring 91 in the expansion / contraction direction, that is, the axial direction (vertical direction), and can regulate the radial position of the spring 91. . Thereby, the attitude | position of the spring 91 is stabilized and the stable pressing force with respect to the battery cell 13 which is a to-be-measured object can be obtained. Further, the front and rear sides of the sensor case 89 are formed by both side plate portions 94 of the sensor holder 87 fitted with the large-diameter cylindrical portion 100 of the sensor case 89 and the guide cylindrical portion 95 of the sensor holder 87 through which the temperature detection line 103 is inserted. The inclination of the direction can be suppressed.

  As shown in FIG. 13, a sensor connector 106 is connected to the other end of each temperature detection line 103. In the present embodiment, two types are prepared: one temperature sensor 82 connected to one sensor connector 106 and two temperature sensors 82 connected to one sensor connector 106.

  As shown in FIG. 14, the temperature sensor 82 is attached by being fitted to the sensor attachment portion 62 of the left frame member 28 from above. That is, when the sensor holder 87 is fitted to the sensor mounting portion 62 from above, the sensor holder 87 is detachably mounted by snap fitting using elastic deformation of both sensor holding pieces 85. The sensor holder 87 is prevented from being detached from the sensor mounting portion 62 by engaging the claw portions 85 a of the sensor holding pieces 85 with the upper plate portion 93 of the sensor holder 87. Further, the small diameter cylindrical portion 98 including the bottom wall portion 97 of the sensor case 89 is inserted into the opening hole 84 a of the bottom plate portion 84 of the sensor mounting portion 62 and protrudes downward from the bottom plate portion 84. Further, the both side plate portions 94 of the sensor holder 87 are fitted between the sensor holding pieces 85 with almost no gap. Thereby, the expansion deformation of the both-sides board part 94 can be suppressed. As a result, the inclination of the sensor case 89 fitted between the side plate portions 94 of the sensor holder 87 can be suppressed.

  As shown in FIG. 13, one temperature sensor 82 connected to one sensor connector 106 is attached to, for example, the front sensor attaching portion 62 of the leftmost frame member 28 on the left front side. . The two temperature sensors 82 connected to one sensor connector 106 are, for example, the rear sensor mounting portion 62 in the left frame member 28 at the rearmost portion on the left side, and the left side in the central portion on the left side. It is attached to the front sensor attachment portion 62 of the frame member 28. Further, the temperature detection line 103 is held by fitting between a pair of front and rear wiring holding pieces 108 formed on the left end portion of the upper wall portion 38 of the main member 26. The connection of the sensor connector 106 will be described later.

  As shown in FIG. 2, the bus bar module 20 is obtained by assembling the monitoring circuit unit 110 to the second assembly 78 (see FIG. 13). FIG. 17 is a bottom view showing the monitoring circuit unit. As shown in FIG. 17, the monitoring circuit unit 110 includes two front and rear circuit cases 112 and a plurality (four in this embodiment) of communication lines 114. The circuit case 112 is made of resin, and is formed in a ceiling box shape having an opening on the lower surface. A battery monitoring circuit 116 is accommodated in the circuit case 112 in a horizontal state. The battery monitoring circuit 116 is formed by mounting a battery monitoring IC 118 and other circuit elements (not shown) on a wiring board 117. The battery monitoring circuit 116 is accommodated in the circuit case 112. The mounting surface of the wiring board 117 is directed to the opening side of the circuit case 112 (the front surface direction in FIG. 17). The wiring board 117 is attached to the circuit case 112 by heat caulking, snap fitting, or the like.

  A temperature sensor connector 120 is provided on the left side of the central portion of the circuit case 112 in the front-rear direction. The connector unit 120 is electrically connected to the battery monitoring circuit 116. In addition, two sets of front and rear locking portions 122 are formed on the left and right side surfaces of the circuit case 112. In the locking portion 122, locking holes 122a penetrating in the vertical direction are formed on both side surfaces of the circuit case 112. Although not shown, the wiring board 117 has a plurality of terminal pins arranged in a line in the front-rear direction. The plurality of terminal pins protrude toward the opening side of the circuit case 112 (the surface direction in FIG. 17).

  The battery monitoring IC 118 monitors the state of the battery cell 13 and is a hybrid integrated circuit that detects the voltage of the battery cell 13, equalizes the voltage of the battery cell 13, level shifts, and the like. The battery monitoring IC 118 in the front circuit case 112 monitors the state of each battery cell 13 with six battery cells 13 as one block. In addition, the battery monitoring IC 118 in the rear circuit case 112 on the rear side monitors the state of each battery cell 13 with eight battery cells 13 as one block.

  The communication line 114 is composed of a lead wire in which a conductive core wire is covered with an insulating covering material. One end of the communication line 114 is connected to a connection terminal (not shown) provided on the wiring board 117 of the battery monitoring circuit 116 of the front circuit case 112 by welding. The other end of the communication line 114 is connected to a connection terminal (not shown) provided on the wiring board 117 of the battery monitoring circuit 116 of the rear circuit case 112 by welding. Therefore, the communication line 114 electrically connects the battery monitoring circuits 116 adjacent to each other in the front-rear direction. Further, the connection portion between the communication line 114 and the battery monitoring circuit 116 is covered with a connection portion cover 124 attached to the circuit case 112. In addition, an external connector connecting connector portion 130 is provided at the rear end portion of the rear circuit case 112 in the monitoring circuit unit 110. In the connector part 130, connection terminals (not shown) provided on the wiring board 117 are arranged.

  As shown in FIG. 2, the monitoring circuit unit 110 is disposed on the upper wall portion 38 of the main member 26 of the holding member 24 including the cover plate 80 of the second assembly 78 (see FIG. 13). Two sets of front and rear locking pieces 55 on the main member 26 are engaged with two sets of front and rear locking portions 122 of each circuit case 112 by snap fitting using elastic deformation (see FIG. 3). Accordingly, the battery monitoring circuit 116 in each circuit case 112 is connected to the connection terminal 64a (see FIG. 6) of the voltage detection line 64 in each terminal block 52 of each terminal block row 50 on the front and back on the main member 26. Each terminal pin (not shown) which has has it connected so that attachment or detachment is possible by insertion, respectively. Accordingly, the plurality of bus bars 22 and the battery monitoring circuit 116 are electrically connected via the voltage detection line 64. In this way, the monitoring circuit unit 110 is detachably attached to the main member 26 of the holding member 24. For this reason, the low voltage side component including the battery monitoring circuit 116 and the communication line 114 is arranged at a higher position than the high voltage side component including the voltage detection line 64. That is, the high voltage side component including the voltage detection line 64 is disposed on the lower layer side, and the low voltage side component including the battery monitoring circuit 116 and the communication line 114 is disposed on the upper layer side.

  A sensor connector 106 connected to one temperature sensor 82 is connected to the connector portion 120 of the front circuit case 112 by a snap fit. Further, the sensor connector 106 connected to the two temperature sensors 82 is connected to the connector portion 120 of the circuit case 112 on the rear side by a snap fit. Further, the intermediate portion of the communication line 114 is held in a state of being sandwiched on the main member 26 by a clip piece 126 formed on the center portion in the front-rear direction of the main member 26.

  The bus bar module 20 is mounted on the battery assembly 12 as follows. As shown in FIG. 1, a bus bar module 20 is disposed on the battery assembly 12. At this time, the mounting holes 22a of the bus bars 22 are fitted into the electrode terminals 15 of the battery cells 13 adjacent to the front and rear of the battery assembly 12, respectively. As shown in FIG. 3, the bus bar 22 is overlaid on the contact plate 17 of the electrode terminal 15. Subsequently, a plurality of battery cells 13 of the battery assembly 12 are connected in series by fastening the nut 128 to each electrode terminal 15.

  Further, the seal member 42 attached to the lower surface of the both pedestal portions 40 a of the main member 26 is elastically adhered to the upper surface of the cell body 14 of each battery cell 13 of the battery assembly 12. The hollow portion (gas discharge passage) 44 of the main member 26 corresponds to the safety valve 18 of each battery cell 13. Further, the bottom wall portion (temperature measuring portion) 97 of the sensor case 89 of the temperature sensor 82 is elastically contacted, that is, in close contact with the upper surface of the cell body 14 of the battery cell 13 by the elasticity of the spring 91 (see FIG. 14). . In this way, the battery module 10 (see FIG. 1) is configured.

  The battery module 10 is mounted on a vehicle (not shown). An external connector (not shown) is detachably connected to the connector portion 130 of the monitoring circuit unit 110 of the bus bar module 20. The external connector is connected to an electric circuit including an electric motor (not shown), an electric circuit including a controller, and the like. In addition, the gas discharged from the safety valve 18 (see FIG. 3) of each battery cell 13 flows through the gas discharge passage 44 of the main member 26, and then is discharged to the outside of the vehicle via a gas discharge pipe (not shown). The

  In the battery module described above, when the battery monitoring circuit 116 of the bus bar module 20 fails, the monitoring circuit unit 110 is removed upward after removing the external connector from the connector portion 130 of the monitoring circuit unit 110. That is, the engagement of each locking piece 55 of the main member 26 of the holding member 24 with respect to each locking portion 122 of each circuit case 112 of the monitoring circuit unit 110 is released using elastic deformation of the locking piece 55. Thus, the monitoring circuit unit 110 may be moved upward. Thereby, each circuit case 112 of the monitoring circuit unit 110 can be removed from the main member 26 of the holding member 24. Accordingly, each terminal pin (not shown) included in the battery monitoring circuit 116 can be removed from the connection terminal 64 a of the voltage detection line 64 in each terminal block 52 of the main member 26 of the holding member 24. Thereafter, the normal monitoring circuit unit 110 may be attached to the main member 26 of the holding member 24 as described above. In addition, when the monitoring circuit unit 110 is attached or detached, the monitoring circuit unit 110 may replace the entire unit, or only the battery monitoring circuit 116 of the monitoring circuit unit 110 may be replaced.

  According to the bus bar module 20 described above, the battery monitoring circuit 116 including the communication line 114 is detachably provided on the holding member 24, and the voltage detection line 64 is wired so as not to prevent the battery monitoring circuit 116 from being attached or detached. . That is, the high voltage side component including the voltage detection line 64 is disposed on the lower layer side, and the low voltage side component including the battery monitoring circuit 116 and the communication line 114 is disposed on the upper layer side. Therefore, when the battery monitoring circuit 116 fails, the monitoring circuit unit 110 including the battery monitoring circuit 116 can be attached and detached while the bus bar module 20 is attached to the battery assembly 12. For this reason, it is not necessary to attach and detach the bus bar module 20 to the battery assembly 12. Therefore, maintainability at the time of failure of the battery monitoring circuit 116 can be improved. As a result, the replacement cost of the battery monitoring circuit 116 can be reduced.

  The voltage detection line 64 is a lead wire, and a wiring housing recess 46 and a wiring holding groove 48 for guiding the voltage detection line 64 are provided on the surface of the holding member 24 on the battery monitoring circuit 116 side. Therefore, the voltage detection line 64 can be guided by the wiring receiving recess 46 and the wiring holding groove 48 provided in the holding member 24. For this reason, the fluctuation of the voltage detection line 64 due to vibration or the like can be suppressed, and damage such as disconnection of the voltage detection line 64 due to the fluctuation can be suppressed.

  Further, the wiring housing recess 46 and the wiring holding groove 48 are grooved portions that house the voltage detection lines 64. Therefore, the voltage detection line 64 can be accommodated in the wiring accommodating recess 46 and the wiring holding groove 48. For this reason, the voltage detection line 64 can be wired compactly. Further, the wiring holding groove 48 can hold the voltage detection lines 64 individually for each line.

  A cover plate 80 is provided on the surface of the holding member 24 on the battery monitoring circuit 116 side to cover the wiring housing recess 46 and the wiring holding groove 48. Therefore, the cover plate 80 can prevent the voltage detection line 64 from coming off from the wiring housing recess 46 and the wiring holding groove 48. In addition, the voltage detection line 64 accommodated in the wiring accommodating recess 46 and the wiring holding groove 48 can be protected by the cover plate 80. For this reason, the voltage detection line 64 after wiring does not get in the way, and interference between the voltage detection line 64 and other components can be prevented.

  The holding member 24 is provided with a plurality of terminal blocks 52 that connect the voltage detection lines 64 and the battery monitoring circuit 116, and the plurality of terminal blocks 52 are arranged in the column direction of the battery cells 13 and are battery cells. It is biased to one side in the direction intersecting the 13 column directions. Therefore, it is possible to form a wide wiring space on the side (left side) opposite to the one-sided side (right side) of the plurality of terminal blocks 52 in the holding member 24. For this reason, handling of the plurality of voltage detection lines 64 can be facilitated. Further, in the present embodiment, by pulling out all the voltage detection lines 64 from the terminal block 52 to the wide wiring space side (left side), the terminal portions on the terminal block 52 side of all the voltage detection lines 64 are aligned in the same direction. Can be summarized.

  The holding member 24 (specifically, the left frame member 28) is provided with a temperature sensor 82 for detecting the temperature of the battery cell 13, and the temperature sensor 82 includes a sensor holder 87 attached to the left frame member 28, A sensor case 89 provided in the sensor holder 87 so as to be movable back and forth in the axial direction, a sensor element 102 built in the sensor case 89, and a sensor case 89 interposed between the sensor holder 87 and the sensor case 89. And a spring 91 for urging in the advancing direction. Accordingly, in the temperature sensor 82 provided on the holding member 24 (specifically, the left frame member 28), the sensor case 89 is battery cell by the elastic force of the spring 91 interposed between the sensor case 89 and the sensor holder 87. 13 is elastically pressed. For this reason, the temperature of the battery cell 13 can be accurately detected by the temperature sensor 82.

  In addition, frame members 28 and 30 are coupled to the main member 26 of the holding member 24 via a coupling mechanism 70 so as to be movable in the row direction of the battery cells 13. For this reason, the relative displacement between the main member 26 of the holding member 24 and the frame members 28 and 30 due to the expansion and contraction of the battery assembly 12 in the column direction can be absorbed. In the present embodiment, since the voltage detection line 64 is a lead wire, the voltage detection line 64 flexibly responds to relative displacement between the main member 26 of the holding member 24 and the frame members 28 and 30. be able to.

  The coupling mechanism 70 includes a rail portion 72 provided on the main member 26 and a hook portion 74 provided on the frame members 28 and 30 and hooked so as to be movable with respect to the rail portion 72. . Therefore, by engaging the hook portion 74 with the rail portion 72 of the coupling mechanism 70, the main member 26 of the holding member 24 and the frame members 28 and 30 can be easily coupled.

  The left frame member 28 of the holding member 24 is provided with a temperature sensor 82 that detects the temperature of the battery cell 13, and the temperature sensor 82 is a hook portion that is a connecting portion of the left frame member 28 to the main member 26. 74 is arranged adjacent to. Therefore, the amount of displacement of the temperature sensor 82 due to the rattling of the coupling mechanism 70 can be reduced.

  Further, the battery monitoring circuit 116 is covered with a circuit case 112. Thereby, it is possible to prevent foreign matter (water, dust, etc.) from adhering to the battery monitoring circuit 116 from above. As a result, it is possible to prevent the corrosion of the metal member on the upper surface side of the wiring board 117 and the adhesion of dust to the upper surface side of the wiring board 117.

  The battery monitoring circuit 116 is arranged with the mounting surface of the wiring board 117 facing downward. That is, circuit elements such as the battery monitoring IC 118 are arranged on the lower side of the wiring board 117. Thereby, since the wiring board 117 also serves as a cover for covering the circuit elements such as the battery monitoring IC 118, foreign matter (water, dust, etc.) adheres to the circuit elements such as the battery monitoring IC 118 without providing a separate cover. Can be prevented. As a result, it is possible to prevent the occurrence of corrosion of metal members of circuit elements such as the battery monitoring IC 118 and adhesion of dust to the circuit elements such as the battery monitoring IC 118.

  The main member 26 of the holding member 24 also serves as a cover that covers the lower surface opening side of the circuit case 112, that is, the lower surface side (mounting surface side) of the wiring board 117 including circuit elements such as the battery monitoring IC 118. For this reason, it is possible to prevent foreign matter from adhering to the wiring board 117 from below without providing a separate cover. Therefore, it is possible to prevent the occurrence of corrosion of the metal member on the mounting surface side of the wiring board 117, adhesion of dust to the mounting surface side of the wiring board 117, and the like. The main member 26 also serves as a gas discharge duct. For this reason, it is not necessary to provide a dedicated gas discharge duct.

  Further, in the temperature sensor 82, by using a metal spring 91, space saving is achieved as compared with a case where a resin-made flexible member is used (for example, see Japanese Patent Application Laid-Open No. 2011-17638). be able to. As a result, the temperature sensor 82 can be easily attached to and detached from the sensor mounting portion 62 of the left frame member 28. In addition, the elastic force is hardly reduced by creep of the spring 91, and the sensor case 89 is difficult to tilt with respect to the sensor holder 87. For this reason, the adhesiveness of the bottom wall part (temperature measurement part) 97 with respect to a to-be-measured object (battery cell 13) can be maintained over a long period of time. As a result, the accuracy of temperature measurement can be improved and the reliability of temperature measurement can be improved.

  Further, since the sensor case 89 is made of metal, it can be manufactured at low cost by press molding. Further, the temperature sensor 82 can be attached to the sensor attachment portion 62 of the left frame member 28 from above. Further, the temperature sensor 82 attached to the sensor attachment portion 62 can be removed from the sensor attachment portion 62 upward. Further, the temperature sensor 82 can be replaced with the bus bar module 20 attached to the battery assembly 12. For this reason, the replacement cost at the time of failure of the temperature sensor 82 can be reduced.

[Embodiment 2]
A second embodiment will be described. Since this embodiment adds the change to the main member of Embodiment 1, the change part is demonstrated and the overlapping description is abbreviate | omitted. FIG. 18 is a plan view showing the first assembly. As shown in FIG. 18, in this embodiment, the terminal block row 50 of the main member 26 of the holding member 24 (see FIG. 5) in the first embodiment is replaced with a terminal block row in which the arrangement of the terminal blocks 52 is divided into two rows. (Reference numeral 132 is attached). From the terminal block 52 on the left side of the terminal block row 132, the voltage detection line 64 of the left bus bar holding body 32 is drawn to the left. Further, a voltage detection line 64 of the right bus bar holder 34 is drawn rightward from the right terminal block 52.

  In this embodiment, a plurality of guide protrusions 134 and a plurality of wiring housing grooves 136 are formed instead of the wiring housing recesses 46 and the wiring holding grooves 48 of the main member 26 (see FIG. 5) in the first embodiment. ing. The guide protrusion 134 and the wiring receiving groove 136 are disposed along the routing path of the voltage detection line 64. Further, the positioning protrusion 57 (see FIG. 5) of the holding member 24 in the first embodiment is omitted.

  A portion of the voltage detection line 64 of the left bus bar holding body 32 on the terminal block 52 side is housed in the wiring housing groove 136 one by one. A portion of the voltage detection line 64 of the left frame member 28 on the bus bar 22 side is guided by a plurality of guide protrusions 134 one by one. The voltage detection lines 64 of the right bus bar holder 34 are guided by a plurality of guide protrusions 134 for each one. In other words, the voltage detection lines 64 are held between two appropriate sets (one set or a plurality of sets) of guide protrusions 134, and an appropriate number (one or more). A plurality of guide protrusions 134 are bent. The guide protrusions 134 and the wiring receiving groove portions 136 correspond to “wiring guide portions” in this specification.

[Embodiment 3]
A third embodiment will be described. Since the present embodiment is a modification of the temperature sensor of the first embodiment, the modified portion will be described and redundant description will be omitted. FIG. 19 is a cross-sectional view showing a temperature sensor. As shown in FIG. 19, in this embodiment, the sensor case 89 of the temperature sensor 82 (see FIG. 15) in the first embodiment is replaced with a sensor case (reference numeral 138) from which the large-diameter cylindrical portion 100 is omitted. Is added).

[Embodiment 4]
A fourth embodiment will be described. Since the present embodiment is a modification of the temperature sensor of the first embodiment, the modified portion will be described and redundant description will be omitted. FIG. 20 is a cross-sectional view showing a temperature sensor. As shown in FIG. 20, in this embodiment, the sensor case 89 of the temperature sensor 82 (see FIG. 15) in the first embodiment is changed to a sensor case (reference numeral 140). The sensor case 140 is made of metal, and is formed in a bottomed cylindrical shape by press molding. The sensor case 140 includes a bottom wall portion 141, a lower cylinder portion 142, a flange portion 143, and an upper cylinder portion 144. The lower cylinder part 142 and the upper cylinder part 144 are formed with the same diameter. The flange portion 143 is formed by folding the material in a folded shape between the lower tube portion 142 and the upper tube portion 144. A spring 91 is interposed between the flange portion 143 and the upper plate portion 93 of the sensor holder 87. The upper cylinder portion 144 of the sensor case 140 is fitted in the spring 91. Further, the sensor case 140 is prevented from coming off by the flange portion 143 of the sensor case 140 coming into contact with the engaging claw portions 94 a of the side plate portions 94 of the sensor holder 87.

[Embodiment 5]
A fifth embodiment will be described. Since the present embodiment is a modification of the temperature sensor of the first embodiment, the modified portion will be described and redundant description will be omitted. FIG. 21 is a cross-sectional view showing a temperature sensor. As shown in FIG. 21, in this embodiment, the sensor case 89 of the temperature sensor 82 (see FIG. 15) in the first embodiment is changed to a sensor case (reference numeral 146). The sensor case 146 is divided into upper and lower case halves 148 and 150. The upper case half 148 is made of resin. It is formed in a stepped cylindrical shape. The upper case half 148 is formed with a tip end cylindrical portion 148c having a small diameter via a stepped portion 148b at the lower end portion of the large diameter cylindrical main body portion 148a.

  The lower case half 150 is made of metal and is formed into a bottomed cylindrical shape by press molding. The lower case half 150 has a bottom wall portion 150a and a cylindrical portion 150b. A front end cylindrical portion 148c of the upper case half 148 is attached to the cylindrical portion 150b of the lower case half 150 by press-fitting. A spring 91 is interposed between the stepped portion 148 b of the upper case half 148 and the upper plate portion 93 of the sensor holder 87. A spring 91 is fitted in the cylinder main body 148a of the upper case half 148. The upper case half 148 also serves as a guide for the spring 91. The stepped portion 148 b of the upper case half 148 comes into contact with the engaging claws 94 a of the side plate portions 94 of the sensor holder 87, so that the sensor case 146 is prevented from coming off. The sealing resin 104 is potted in the lower case half 150 and in the tip cylindrical portion 148c of the upper case half 148. The bottom wall 150 a is a temperature measuring unit that comes into contact with an object to be measured, that is, the battery cell 13.

  According to this embodiment, only the periphery of the sensor element 102 is accommodated in the lower case half 150 made of metal. For this reason, heat radiation from the upper case half 148 can be suppressed, and only the periphery of the sensor element 102 can be brought close to the temperature of the object to be measured. Further, since the lower case half 150 is not insert-molded into the upper case half 148, the sensor case 146 can be manufactured at low cost.

[Other Embodiments]
The present invention is not limited to the above-described embodiment, and modifications can be made without departing from the gist of the present invention. For example, the present invention is not limited to a hybrid vehicle, and may be applied to a battery assembly 12 that is used for a vehicle such as an electric vehicle and for uses other than the vehicle. The present invention is not limited to lithium ion batteries, and may be applied to nickel metal hydride batteries, nickel cadmium batteries, and the like. Further, the number of battery cells 13 in the battery assembly 12 may be increased or decreased as appropriate. Further, the number of battery cells 13 targeted by one battery monitoring IC 118 may be appropriately increased or decreased. A plurality of bus bar modules 20 may be assembled to one set of battery assemblies 12. In addition, one bus bar module 20 may be assembled to a plurality of battery assemblies 12.

  Further, the main member 26 of the holding member 24 and the left frame member 28 and / or the right frame member 30 may be integrally formed. Further, the left bus bar holding body 32 and the right bus bar holding body 34 of the holding member 24 may be arranged in the left-right direction. Further, the left bus bar holding body 32 or the right bus bar holding body 34 may be arranged on both the left and right sides of the main member 26 of the holding member 24.

  The voltage detection line 64 is not limited to a lead wire, and a wiring member obtained by molding a terminal with resin may be used. In addition, the communication line 114 is not limited to a lead wire, and a flexible board or a wiring member formed by molding a terminal with a resin may be used. Further, the battery monitoring circuit 116 to which the communication line 114 is electrically connected may be the battery monitoring circuit 116 of the adjacent bus bar module 20. For this reason, the bus bar module 20 only needs to include at least one battery monitoring circuit 116. The battery monitoring circuit 116 may be disposed in the circuit case 112 with the mounting surface of the wiring board 117 on the battery monitoring IC 118 side facing upward.

  Further, the wiring guide portion may be a groove-like portion that independently guides the voltage detection lines 64 one by one. In this case, the contact between the voltage detection lines 64 due to the wobbling of the voltage detection lines 64 due to vibration or the like can be prevented. Further, even if the liquid leaking from the battery cell 13 travels through the voltage detection line 64, it is possible to prevent the liquid from adhering to the other voltage detection line 64. Further, the cover plate 80 may be omitted. Further, the number, shape, and length of the cover plate 80 with respect to the bus bar module 20 may be changed as appropriate. The cover plate 80 may be provided as necessary.

  Further, the number of temperature sensors 82 for the bus bar module 20 may be increased or decreased. The temperature sensor 82 is not limited to the left frame member 28 of the holding member 24 but may be provided on the right frame member 30 or the main member 26, or the main member 26 and the left frame member 28 and / or the right frame member 28. The frame member 30 and the holding member formed integrally may be provided. Further, the temperature sensor 82 may be used as the temperature sensor 82 that uses a member other than the battery cell 13 as an object to be measured. Further, the sensor holder 87 of the temperature sensor 82 is not limited to resin, but may be made of metal. Further, the spring 91 of the temperature sensor 82 is not limited to a coil spring, and other springs or rubber cushions may be used. A temperature sensor having a structure different from that of the temperature sensor 82 of the embodiment may be used.

  Further, the rail portion 72 and the hook portion 74 of the coupling mechanism 70 may be arranged in reverse. That is, the hook portion 74 may be provided on the main member 26 and the rail portion 72 may be provided on the frame members 28 and 30. The connecting mechanism 70 may be any mechanism that connects the main member 26 of the holding member 24 and the frame members 28 and 30 so as to be movable in the row direction of the battery cells 13, and includes a rail portion 72 and a hook portion 74. It is not limited to what you do.

DESCRIPTION OF SYMBOLS 10 ... Battery module 12 ... Battery assembly 13 ... Battery cell 15 ... Electrode terminal 20 ... Bus bar module 22 ... Bus bar 24 ... Holding member 26 ... Main member (holding member main-body part)
28 ... Left frame member (bus bar holding part)
30 ... Right frame member (busbar holding part)
46 .. Wiring housing recess (wiring guide)
48 ... Wiring holding groove (wiring guide)
52 ... Terminal block (wiring connection)
64 ... voltage detection line 70 ... coupling mechanism 72 ... rail part 74 ... hook part 80 ... cover plate (cover member)
82 ... Temperature sensor 87 ... Sensor holder 89 ... Sensor case 91 ... Spring (elastic member)
102 ... Sensor element 114 ... Communication line 116 ... Battery monitoring circuit 134 ... Guide protrusion (wiring guide part)
136: Wiring receiving groove (wiring guide)
138 ... sensor case 140 ... sensor case 146 ... sensor case

Claims (9)

A bus bar module attached to a battery assembly in which a plurality of battery cells are arranged,
A plurality of bus bars connecting the electrode terminals of adjacent battery cells in series;
A battery monitoring circuit for detecting a terminal voltage of the battery cell;
A holding member for holding the bus bar and the battery monitoring circuit;
A plurality of voltage detection lines for electrically connecting the plurality of bus bars and the battery monitoring circuit;
A communication line that electrically connects adjacent battery monitoring circuits, and
The bus bar module, wherein the battery monitoring circuit including the communication line is detachably provided on the holding member, and the voltage detection line is wired so as not to prevent the battery monitoring circuit from being attached or detached. The bus bar module according to claim 1,
The voltage detection line comprises a lead wire,
A bus bar module in which a wiring guide portion for guiding the voltage detection line is provided on a surface of the holding member on the battery monitoring circuit side. The bus bar module according to claim 2,
The said wiring guide part is a bus-bar module which consists of a groove-shaped part which accommodates the said voltage detection line. The bus bar module according to claim 3,
A bus bar module in which a cover member that covers the wiring guide portion formed of a groove-like portion is provided on a surface of the holding member on the battery monitoring circuit side. It is a bus-bar module as described in any one of Claims 1-4, Comprising:
The holding member is provided with a plurality of wiring connection portions that connect the voltage detection lines and the battery monitoring circuit,
The plurality of wiring connection portions are arranged in a row direction of the battery cells and are shifted to one side in a direction crossing the row direction of the battery cells. It is a bus-bar module as described in any one of Claims 1-5,
The holding member is provided with a temperature sensor for detecting the temperature of the battery cell,
The temperature sensor includes a sensor holder attached to the holding member, a sensor case provided in the sensor holder so as to be movable back and forth in the axial direction, a sensor element incorporated in the sensor case, the sensor holder, and the sensor A bus bar module, comprising: an elastic member interposed between the case and an urging member that urges the sensor case in the advancing direction. It is a bus-bar module as described in any one of Claims 1-5,
The holding member includes a holding member main body that holds the battery monitoring circuit, and a bus bar holding portion that holds the bus bars.
The bus bar module, wherein the bus bar holding portion is connected to the holding member main body portion via a connecting mechanism so as to be movable in the row direction of the battery cells. The bus bar module according to claim 7,
The coupling mechanism includes a rail portion provided on one of the holding member main body portion and the bus bar holding portion, and a hook provided on the other member and movably hooked to the rail portion. A bus bar module that consists of two parts. The bus bar module according to claim 7 or 8,
The bus bar holding part is provided with a temperature sensor for detecting the temperature of the battery cell,
The temperature sensor is a bus bar module disposed adjacent to a connecting portion of the bus bar holding portion with respect to the holding member main body portion.

Images