Battery pack

Abstract

To improve assemblability while firmly joining constituent members in a battery pack.SOLUTION: The battery pack 1 includes a plurality of stacked batteries 100, and extends in an intersecting direction (width direction Y) intersecting a stacking direction X at end portions of the plurality of batteries 100 along the stacking direction X. The battery module includes the holding member (the first end block 211 and the second end block 213) that holds the plurality of batteries 100, the control unit (the controller unit 400) that controls the plurality of batteries 100, the input / output unit (the junction unit 700) that is provided along the stacking direction X and to / from which electric power of the plurality of batteries 100 is input / output via the controller unit 400, and the fastening member (the fastening bolt 241) that directly fastens the first end block 211 and the second end block 213 to the housing (the case 721) of the junction unit 700.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present invention relates to a battery pack. [Background technology]

[0002] BACKGROUND ART Conventionally, a battery pack (battery device) provided with a junction box has been known (see, for example, Patent Document 1). [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Patent No. 5555739 Summary of the Invention [Problem to be solved by the invention]

[0004] In battery packs, there is a demand for improving assembly efficiency while firmly joining components. [Means for solving the problem]

[0005] The battery pack of the present invention comprises a plurality of stacked batteries, a holding member that extends in a direction intersecting the stacking direction at an end of the plurality of batteries along the stacking direction and holds the plurality of batteries, a control unit that controls the plurality of batteries, an input / output unit that is provided along the stacking direction and through which power from the plurality of batteries is input and output via the control unit, and a fastening member that directly fastens the holding member to a housing of the input / output unit. [Effects of the Invention]

[0006] According to the battery pack of the present invention, the components can be firmly joined together and assembly can be improved. [Brief explanation of the drawings]

[0007] [Figure 1] 1 is a perspective view showing a battery pack 1 according to an embodiment. [Figure 2] 2A and 2B are perspective views showing the battery pack 1 of FIG. 1 in different orientations along the horizontal direction. [Figure 3] 2 is a perspective view showing the battery pack 1 of FIG. 1 from below. FIG. [Figure 4] 2 is a top view showing the battery pack 1 of FIG. 1 without a busbar holder 321. FIG. [Figure 5] FIG. 5 is a top view showing components of area F5 in FIG. 4. [Figure 6] 6 is a top view showing, in partial cross section, components of region F6 in FIG. 5; FIG. [Figure 7] 5 is a perspective view showing, in partial cross section, components of region F7 in FIG. 4. FIG. [Figure 8] 8 is a perspective view showing some of the components of the battery pack 1 in FIG. 7 exploded in the height direction Z. FIG. [Figure 9] 9 is a side view showing the components in a cross section taken along line 9-9 in FIG. 7. [Figure 10] FIG. 7 is a perspective view showing a case 721 and an insert nut 722 of the junction unit 700. [Figure 11] FIG. 7 is a top view showing a third housing portion 721f of the case 721 and a negative electrode side connecting terminal 709. [Figure 12] 10 is a top view showing a third housing portion 731f of a case 731 according to a first modification of the case 721, and a negative electrode side connecting terminal 709. FIG. [Figure 13] 10 is a top view showing a third housing portion 741f of a case 741 according to a second modification of the case 721, and a negative electrode side connecting terminal 709. FIG. [Figure 14] FIG. 2 is a perspective view showing the battery 100, cell spacer 202, and second side plate 232 in an exploded state in the stacking direction X. [Figure 15] FIG. 15 is a side view showing the components of FIG. 14. [Figure 16] 5 is a perspective view showing some of the components of a junction unit 700 of the battery pack 1 in FIG. 4 exploded in the width direction Y. FIG. [Figure 17] 2 is a perspective view of the batteries 100 and the holding unit 200 of the battery pack 1, showing some of the components of the holding unit 200 exploded in the width direction Y. FIG. [Figure 18]18 is a perspective view showing the battery 100 and the holding unit 200 in a state where the first side plate 231 and the second side plate 232 are removed from FIG. 17 and the components thereof are disassembled in the stacking direction X. FIG. [Figure 19] 5 is a perspective view showing some of the components of the controller unit 400 of the battery pack 1 in FIG. 4 exploded in the width direction Y. FIG. [Figure 20] FIG. 2 is a perspective view showing a part of the temperature measurement unit 600 and the junction unit 700. [Figure 21] FIG. 2 is a perspective view showing a voltage detection unit 500. [Figure 22] FIG. 2 is a schematic diagram showing the layout of the battery pack 1. [Figure 23] 10 is a schematic diagram showing the layout of a battery pack 2 according to a first modification of the battery pack 1. FIG. [Figure 24] 10 is a schematic diagram showing the layout of a battery pack 3 according to a second modification of the battery pack 1. FIG. DETAILED DESCRIPTION OF THE INVENTION

[0008] Embodiments of the present invention will be described with reference to the drawings. To facilitate understanding of each embodiment, the size and proportions of components may be exaggerated in each drawing. The same reference numerals are used for the same components in each drawing. In each drawing, the stacking direction X, width direction Y, and height direction Z of the battery pack 1 are indicated by arrows. However, in each drawing, the stacking direction X, width direction Y, and height direction Z of the battery pack 1 indicate the relative positional relationship within the same drawing. That is, if the battery pack 1 is rotated 180 degrees and placed with the top and bottom faces reversed, or if the battery pack 1 is rotated 90 degrees and placed with the top face as a side, the stacking direction X, width direction Y, and height direction Z of the battery pack 1 will change. In each drawing, the threads on the outer surfaces of the fastening bolts and the grooves on the inner surfaces of the insert nuts are omitted.

[0009] (Configuration of battery pack 1 according to embodiment) The configuration of a battery pack 1 according to an embodiment will be described with reference to FIGS.

[0010] The battery pack 1 is configured as, for example, a power source for operating an electrical device 1000 mounted on a vehicle. The battery pack 1 may also be configured as, for example, a power source for operating a motor for running the vehicle.

[0011] The battery pack 1 includes a plurality of batteries 100, a holding unit 200 that holds the plurality of batteries 100, a bus bar unit 300 that electrically connects the plurality of batteries 100, and a controller unit 400 that controls the input and output of power to and from the plurality of batteries 100. The battery pack 1 also includes, as units controlled by the controller unit 400, a voltage detection unit 500 that detects the voltage of the batteries 100, a temperature measurement unit 600 that measures the temperature of the batteries 100, and a junction unit 700 that electrically connects, for example, an electrical device 1000 on the vehicle side to the plurality of batteries 100. It is arbitrary which unit, from the holding unit 200 to the junction unit 700, the components of the battery pack 1 are included in and is not limited.

[0012] (Configuration of battery 100) As shown in FIG. 4, the batteries 100 are stacked in a stacking direction X via holding units 200. For example, 12 batteries 100 are stacked. The batteries 100 are constituted by, for example, lithium ion batteries. The batteries 100 shown in FIGS. 1 to 5, 7, 8, and 14 to 19 include a current collector, a container 101, a lid 102, a positive terminal 103 (electrode terminal), and a negative terminal 104 (electrode terminal). The components included in the battery 100 will be described below.

[0013] The current collector of the battery 100 is configured by winding or stacking a positive electrode and a negative electrode with an insulating member (separator) interposed therebetween. In other words, the current collector corresponds to a charge / discharge body that charges and discharges electricity. The current collector is housed in a container 101. The container 101 is filled with an electrolyte. A lid 102 is joined to the opening of the container 101 and seals the current collector. A positive electrode terminal 103 and a negative electrode terminal 104 relay the input and output of electricity between the current collector and the electrical device 1000.

[0014] As shown in FIG. 18 , the battery 100 is formed in a rectangular shape (rectangular parallelepiped shape). The positive electrode terminal 103 and the negative electrode terminal 104 are provided on one surface 100a of the battery 100 along the stacking direction X. The one surface 100a of the battery 100 corresponds to the lid 102. The one surface 100a is rectangular, and the length along the stacking direction X of the battery 100 is shorter than the length along a width direction Y (intersecting direction) that intersects with the stacking direction X of the battery 100. A control board 401 of the controller unit 400 faces the other surface 100b of the battery 100 that intersects with the one surface 100a and is adjacent to the one surface 100a.

[0015] (Configuration of holding unit 200) The holding unit 200 holds multiple batteries 100. When two adjacent batteries 100 are stacked in the stacking direction X, the positive terminal 103 of the battery 100 and the negative terminal 104 of the other battery 100 are aligned in the stacking direction X. The holding unit 200 shown in FIGS. 1 to 5, 7 to 9, and 14 to 19 includes a first end spacer 201, a cell spacer 202, a first intermediate spacer 203, a second intermediate spacer 204, and a second end spacer 205. The holding unit 200 also includes a first end block 211, an intermediate block 212, and a second end block 213. The holding unit 200 also includes an insulating member 221 and an insert nut 222. The holding unit 200 also includes a first side plate 231, a second side plate 232, and a fastening bolt 241. The components included in the holding unit 200 are described below.

[0016] As shown in FIG. 18 , the first end spacer 201 is provided between the first end block 211 and the battery 100. This battery 100 corresponds to the first battery 100 located at one end side (corresponding to the left end in FIG. 4 ) of the twelve stacked batteries 100. The first end spacer 201 insulates the first end block 211 from the battery 100. The first end spacer 201 covers each side surface of the first end block 211 and the battery 100 in the width direction Y and a portion of the side surface of the battery 100 in the stacking direction X. The thickness of the first end spacer 201 in the stacking direction X is sufficiently thinner than the thickness of the battery 100 in the stacking direction X. The first end spacer 201 is made of an insulating material.

[0017] As shown in FIG. 18 , the cell spacers 202 are provided between adjacent batteries 100. The cell spacers 202 hold and insulate the adjacent batteries 100. The cell spacers 202 cover each side surface of the adjacent batteries 100 in the width direction Y and a portion of each side surface of the adjacent batteries 100 in the stacking direction X. The thickness of the cell spacers 202 in the stacking direction X is sufficiently thinner than the thickness of the batteries 100 in the stacking direction X. The cell spacers 202 are made of an insulating material.

[0018] 14, 15, 17, and 18, a pair of rigid portions 202P is formed on the upper portion of the cell spacer 202 along the stacking direction X. As shown in Fig. 18, the pair of rigid portions 202P is formed on both sides of the cell spacer 202 in the width direction Y. As shown in Fig. 15, the rigid portion 202P includes a protrusion 202a, a first rigid portion 202b, a second rigid portion 202c, a third rigid portion 202d, and an attachment portion 202e.

[0019] As shown in Fig. 15, the protrusion 202a of the cell spacer 202 protrudes from the battery 100 toward the first side plate 231 or the second side plate 232. The first rigid portion 202b extends along the width direction Y so as to approach the battery 100. Of the protrusions 202a of the pair of rigid portions 202P, one protrusion 202a located on the first side plate 231 side protrudes toward the first side plate 231. The other protrusion 202a located on the second side plate 232 side protrudes toward the second side plate 232 as shown in Fig. 15.

[0020] As shown in FIG. 15, the first rigid portion 202b of the cell spacer 202 contacts the lid 102 of the battery 100. The first rigid portion 202b is continuous with the protrusion 202a along the width direction Y. As shown in FIG. 15, the second rigid portion 202c extends from the tip of the first rigid portion 202b along the height direction Z. The tip of the first rigid portion 202b is a portion of the first rigid portion 202b extending in the width direction Y that is relatively close to the center of the battery 100. As shown in FIG. 15, the third rigid portion 202d extends from the tip of the second rigid portion 202c along the width direction Y, the same as the protrusion 202a. The tip of the second rigid portion 202c is a portion of the second rigid portion 202c extending in the height direction Z that is relatively far from the battery 100.

[0021] As shown in FIG. 15, the mounting portion 202e of the cell spacer 202 is formed by a portion surrounded by the first rigid portion 202b, the second rigid portion 202c, and the third rigid portion 202d. The accommodation portion 232e is formed in a concave shape. Of the pair of rigid portions 202P formed in the cell spacer 202, the mounting portion 202e of the rigid portion 202P located on the first side plate 231 side opens toward the first side plate 231 as shown in FIG. 17. The mounting portion 202e of the rigid portion 202P located on the second side plate 232 side opens toward the second side plate 232 as shown in FIG. 17. The mounting portion 202e is formed by a concave recess to which the third rigid portion 232c of the second side plate 232 is attached. The mounting portion 202e is formed in a U-shape.

[0022] As shown in FIG. 18 , the first intermediate spacer 203 is disposed between the intermediate block 212 and the battery 100 relatively closer to the first end block 211. This battery 100 corresponds to the sixth battery 100 from one end of the twelve stacked batteries 100. The first intermediate spacer 203 insulates the intermediate block 212 from the battery 100. The first intermediate spacer 203 covers each side surface of the battery 100 and the intermediate block 212 along the width direction Y and a portion of the side surface of the battery 100 along the stacking direction X. The thickness of the first intermediate spacer 203 along the stacking direction X is significantly thinner than the thickness of the battery 100 along the stacking direction X. As shown in FIG. 18 , the first intermediate spacer 203 has a pair of rigid portions 203P formed on both sides of the width direction Y. The configuration of the rigid portions 203P of the first intermediate spacer 203 is similar to the configuration of the rigid portion 202P of the cell spacer 202. The first intermediate spacer 203 is formed of an insulating material.

[0023] As shown in FIG. 18 , the second intermediate spacer 204 is disposed between the intermediate block 212 and the battery 100 relatively closer to the second end block 213. This battery 100 corresponds to the seventh battery 100 from one end of the twelve stacked batteries 100. The second intermediate spacer 204 insulates the intermediate block 212 from the battery 100. The second intermediate spacer 204 covers each side surface of the intermediate block 212 and the battery 100 along the width direction Y and a portion of the side surface of the intermediate block 212 and the battery 100 along the stacking direction X. The thickness of the second intermediate spacer 204 along the stacking direction X is sufficiently thinner than the thickness of the battery 100 along the stacking direction X. As shown in FIG. 18 , the second intermediate spacer 204 has a pair of rigid portions 204P formed on both sides in the width direction Y. The configuration of the rigid portion 204P of the second intermediate spacer 204 is similar to the configuration of the rigid portion 202P of the cell spacer 202. The second intermediate spacer 204 is made of an insulating material.

[0024] As shown in FIG. 18 , the second end spacer 205 is provided between the battery 100 and the second end block 213. This battery 100 corresponds to the twelfth battery 100 located at the other end (corresponding to the right end in FIG. 4 ) of the twelve stacked batteries 100. The second end spacer 205 insulates the battery 100 from the second end block 213. The second end spacer 205 covers each side surface of the battery 100 and the second end block 213 in the width direction Y and a portion of the side surface of the battery 100 in the stacking direction X. The thickness of the second end spacer 205 in the stacking direction X is sufficiently thinner than the thickness of the battery 100 in the stacking direction X. The second end spacer 205 is made of an insulating material.

[0025] As shown in FIGS. 4 and 18 , the first end block 211 is stacked with the first battery 100 located at one end of the twelve stacked batteries 100, via a first end spacer 201. The first end block 211 extends in a width direction Y (intersecting direction) that intersects with the stacking direction X of the batteries 100. The first end block 211 is adjacent to the battery 100 located at the end along the stacking direction X and is a support member that supports the battery 100. The first end block 211 is formed in a rectangular parallelepiped shape that extends in the width direction Y. Fastening bolts 241 are screwed into a plurality of insertion holes 211m formed in the side surface of the first end block 211 along the stacking direction X and a plurality of insertion holes 211n formed in the side surface of the first end block 211 along the width direction Y, as shown in FIG. 18 . The first end block 211 is fixed to the first side plate 231 by the fastening bolts 241, as shown in FIGS. 4 and 19 . Similarly, as shown in FIGS. 4 and 16 , the first end block 211 is fixed to the second side plate 232 by fastening bolts 241. The first end block 211 is made of, for example, metal and has sufficient rigidity. Here, when the first end block 211 is made of a conductor such as metal, it has particularly magnetic shielding properties. Furthermore, when the first end block 211 is made of resin or plastic, it has particularly electrical shielding properties. Electrical shielding refers to the property of blocking or attenuating the influence of external electric or magnetic fields on a communication line by a conductor placed near the communication line.

[0026] As shown in FIGS. 4 and 18 , the intermediate block 212 is stacked between the first intermediate spacer 203 and the second intermediate spacer 204. That is, the intermediate block 212 is located, for example, between the sixth and seventh batteries 100 of the twelve stacked batteries 100. The intermediate block 212 is a support member that is adjacent to the batteries 100 in the width direction Y of the batteries 100 and supports the batteries 100. The intermediate block 212 is formed in a rectangular parallelepiped shape extending in the width direction Y. Fastening bolts 241 are screwed into multiple insertion holes 212m formed on the side surface of the intermediate block 212 along the stacking direction X shown in FIG. 18 . The intermediate block 212 is fixed to the first side plate 231 by the fastening bolts 241 as shown in FIG. 19 . Similarly, the intermediate block 212 is fixed to the second side plate 232 by the fastening bolts 241 as shown in FIG. 16 . The intermediate block 212 is made of, for example, metal or resin and has sufficient rigidity. If the intermediate block 212 is made of a conductor such as metal, it has particularly good magnetic shielding properties. If the intermediate block 212 is made of resin or plastic, it has particularly good electrical shielding properties.

[0027] As shown in FIGS. 4 and 18 , the second end block 213 is stacked with the twelfth battery 100 located at the other end of the twelve stacked batteries 100, via a second end spacer 205. The second end block 213 extends along the width direction Y of the batteries 100. The second end block 213 is adjacent to the battery 100 located at the end along the stacking direction X and is a support member that supports the battery 100. The second end block 213 is formed in a rectangular parallelepiped shape extending in the width direction Y. Fastening bolts 241 are screwed into multiple insertion holes 213m formed in the side surface of the second end block 213 along the stacking direction X shown in FIG. 18 and multiple insertion holes formed in the side surface of the second end block 213 along the width direction Y. As shown in FIGS. 4 and 19 , the second end block 213 is fixed to the first side plate 231 by the fastening bolts 241. Similarly, as shown in Figures 4 and 16, the second end block 213 is fixed to the second side plate 232 by fastening bolts 241. The second end block 213 is made of, for example, metal and has sufficient rigidity. If the second end block 213 is made of a conductor such as metal, it has particularly good magnetic shielding properties. If the second end block 213 is made of resin or plastic, it has particularly good electrical shielding properties.

[0028] As shown in Fig. 18, the insulating member 221 is inserted into a recess located near the junction unit 700 on the upper surface of the first end block 211. Also, as shown in Figs. 7 to 9 and 18, the insulating member 221 is inserted into a recess located near the junction unit 700 on the upper surface of the second end block 213. The insulating member 221 inserted into the second end block 213 corresponds to another holding member that holds the negative electrode side connection terminal 709. The insulating member 221 is formed, for example, in the shape of a rectangular parallelepiped. The insulating member 221 is formed from an insulating material.

[0029] The insulating member 221 may be configured as follows. That is, the insulating member 221 may be configured by being molded integrally with the first end spacer 201, or by being molded separately from the first end spacer 201 and then joined to the first end spacer 201. In such a case, the first end block 211 has a recess on its surface facing the first end spacer 201 that accommodates the insulating member 221 along the stacking direction X. Similarly, the insulating member 221 may be configured by being molded integrally with the second end spacer 205, or by being molded separately from the second end spacer 205 and then joined to the second end spacer 205. In such a case, the second end block 213 has a recess on its surface facing the second end spacer 205 that accommodates the insulating member 221 along the stacking direction X.

[0030] The insert nut 222 is a mooring member, and as shown in Figures 8, 9, and 18, is embedded in a recess formed in the upper surface of the insulating member 221. The insert nut 222 moored the fastening bolt 311, which is the first fixing member, via, for example, the negative electrode side connection terminal 709. As a modified example of the embodiment, instead of the insert nut 222, a mooring portion corresponding to a thread groove for mooring the fastening bolt 311 may be formed in the insulating member 221 provided on the second end block 213.

[0031] 1, the first side plate 231 is arranged along the stacking direction X of the stacked batteries 100, at one end of the plurality of batteries 100 in the width direction Y. As shown in FIG. 1, the first side plate 231 is located on the controller unit 400 side.

[0032] The first side plate 231 is a holding member that holds multiple batteries 100 along the stacking direction X. As shown in FIG. 17 , fastening bolts 241 are inserted into multiple insertion holes 231m formed in the side surface of the first side plate 231 along the stacking direction X and multiple insertion holes 231n formed in the side surface of the first side plate 231 along the width direction Y. As shown in FIGS. 1 and 19 , the first side plate 231 is fixed to the first end block 211, the intermediate block 212, and the second end block 213 by the fastening bolts 241. As shown in FIG. 1, a controller unit 400 is attached to the first side plate 231.

[0033] 17, a rigid portion 231P is formed on the upper portion of the first side plate 231 along the stacking direction X. As shown in FIG. 17, the rigid portion 231P includes a first rigid portion 231a, a second rigid portion 231b, a third rigid portion 231c, and an accommodating portion 231d.

[0034] The first rigid portion 231a of the first side plate 231 extends in the width direction Y so as to be away from the battery 100. The second rigid portion 231b extends in the height direction Z from a tip of the first rigid portion 231a. The tip of the first rigid portion 231a is a portion of the first rigid portion 231a extending in the width direction Y that is relatively far from the battery 100. The third rigid portion 231c is a protruding portion that protrudes in the width direction Y from the tip of the second rigid portion 231b so as to approach the battery 100. The tip of the second rigid portion 231b is a portion of the second rigid portion 231b extending in the height direction Z that is relatively far from the battery 100. The third rigid portion 231c of the first side plate 231 is in contact with the protruding portion 202a of the cell spacer 202 in a direction intersecting the stacking direction X, i.e., along the height direction Z. The tip of the third rigid portion 231c protrudes further inward of the battery 100 than the outer edge 100c of the battery 100.

[0035] The accommodation portion 231d of the first side plate 231 is formed by a portion surrounded by the first rigid portion 231a, the second rigid portion 231b, and the third rigid portion 231c. The accommodation portion 231d is open toward the battery 100 along the stacking direction X. The accommodation portion 231d is formed by a recessed depression that accommodates the protrusion 202a of the cell spacer 202. The accommodation portion 231d is formed in a U-shape.

[0036] 1, the second side plate 232 is arranged along the stacking direction X of the stacked batteries 100, at the other end of the batteries 100 in the width direction Y. As shown in FIG. 1, the second side plate 232 is located on the junction unit 700 side.

[0037] The second side plate 232 is a holding member that holds multiple batteries 100 along the stacking direction X. As shown in FIG. 17 , fastening bolts 241 are inserted into multiple insertion holes 232m formed in a side surface of the second side plate 232 along the stacking direction X and multiple insertion holes 232n formed in a side surface of the second side plate 232 along the width direction Y. As shown in FIGS. 1 and 16 , the second side plate 232 is fixed to the first end block 211, the intermediate block 212, and the second end block 213 by the fastening bolts 241. As shown in FIG. 1, a junction unit 700 is attached to the second side plate 232.

[0038] 17, a rigid portion 232P is formed on the upper portion of the second side plate 232 along the stacking direction X. As shown in FIG. 15, the rigid portion 232P includes a first rigid portion 232a, a second rigid portion 232b, a third rigid portion 232c, and an accommodating portion 232d.

[0039] As shown in FIG. 15 , the first rigid portion 232a of the second side plate 232 extends in the width direction Y so as to be away from the battery 100. The second rigid portion 232b extends in the height direction Z from the tip of the first rigid portion 232a. The tip of the first rigid portion 232a is a portion of the first rigid portion 232a extending in the width direction Y that is relatively far from the battery 100. The third rigid portion 232c is a protruding portion that protrudes in the width direction Y from the tip of the second rigid portion 232b so as to approach the battery 100. The tip of the second rigid portion 232b is a portion of the second rigid portion 232b extending in the height direction Z that is relatively far from the battery 100. As shown in FIG. 15 , the third rigid portion 232c of the second side plate 232 contacts the protruding portion 202a of the cell spacer 202. As shown in FIG. 15, a tip 232c1 of the third rigid portion 232c protrudes further inward of the battery 100 than the outer edge 100c of the battery 100. As shown in FIG.

[0040] The accommodation portion 232d of the second side plate 232 is formed by a portion surrounded by the first rigid portion 232a, the second rigid portion 232b, and the third rigid portion 232c. The accommodation portion 232d is open toward the battery 100 along the stacking direction X. The accommodation portion 232d is formed by a recessed depression that accommodates the protrusion 202a of the cell spacer 202. The accommodation portion 232d is formed in a U-shape. In FIG. 15, the accommodation portion 232d is shown in a state where the U-shape has been rotated 180 degrees.

[0041] The fastening bolts 241 are fastening members. The fastening bolts 241 directly fasten the first end block 211 and the case 721 of the junction unit 700 along the width direction Y and stacking direction X of the battery 100. The fastening bolts 241 directly fasten the second end block 213 and the case 721 of the junction unit 700 along the width direction Y and stacking direction X of the battery 100. As shown in FIGS. 4 and 19 , the fastening bolts 241 fasten the first side plate 231 and the first end block 211, the first side plate 231 and the intermediate block 212, and the first side plate 231 and the second end block 213. As shown in FIGS. 4 and 16 , the fastening bolts 241 also fasten the second side plate 232 and the first end block 211, the second side plate 232 and the intermediate block 212, and the second side plate 232 and the second end block 213.

[0042] (Configuration of busbar unit 300) The busbar unit 300 electrically connects multiple batteries 100. The busbar unit 300 shown in Figures 1, 2, 4, 5, 7 to 9, 16, 19, and 21 includes a first end busbar 301, multiple busbars 302, an intermediate busbar 303, a second end busbar 304, a fastening bolt 311, and a busbar holder 321. The components included in the busbar unit 300 will be described below.

[0043] As shown in FIGS. 4 and 21 , the first end bus bar 301 is joined to the first relay bus bar 701 of the junction unit 700 and to the positive terminal 103 of the first battery 100 of the twelve stacked batteries 100. As shown in FIG. 21 , the first end bus bar 301 includes a plate-shaped first joint portion 301 a, a plate-shaped second joint portion 301 b, a curved connecting portion 301 c, and an insertion hole 301 d. The first joint portion 301 a is joined to the first relay bus bar 701 of the junction unit 700. The second joint portion 301 b is joined to the positive terminal 103 of the first battery 100 of the twelve stacked batteries 100. The connecting portion 301 c connects the first joint portion 301 a and the second joint portion 301 b. The insertion hole 301 d is formed in the first joint portion 301 a. Fastening bolts 311 are inserted into insertion holes 301d. First end bus bar 301 is made of a clad material in which copper and aluminum are bonded together, copper, or aluminum. When first end bus bar 301 is made of a clad material, for example, first joint portion 301a is made of copper and second joint portion 301b is made of aluminum.

[0044] As shown in FIG. 4, the bus bar 302 electrically connects one battery 100 to the other batteries 100. As shown in FIG. 4, the bus bar 302 is joined to the positive terminal 103 of one battery 100 adjacent to the other battery 100 along the stacking direction X, excluding the sixth and seventh batteries 100, among the twelve stacked batteries 100. As shown in FIG. 4, the bus bar 302 is joined to the negative terminal 104 of the other battery 100 adjacent to the other battery 100 along the stacking direction X. As shown in FIG. 21, the bus bar 302 includes a plate-shaped first joint portion 302a, a plate-shaped second joint portion 302b, and a curved connecting portion 302c. The first joint portion 302a is joined to the negative terminal 104 of the one adjacent battery 100. The second joint portion 302b is joined to the positive terminal 103 of the other adjacent battery 100. The connecting portion 302c connects the first joint portion 302a and the second joint portion 302b. Bus bar 302 is formed of, for example, a clad material in which copper and aluminum are bonded together, copper, or aluminum. When bus bar 302 is formed of a clad material, for example, first joint portion 302a is formed of copper and second joint portion 302b is formed of aluminum.

[0045] As shown in FIG. 4 , the intermediate bus bar 303 electrically connects one battery 100 to the other batteries 100. As shown in FIG. 4 , the intermediate bus bar 303 is joined to the sixth and seventh batteries 100 located in the center of the stack along the stacking direction X among the twelve stacked batteries 100. As shown in FIG. 21 , the intermediate bus bar 303 includes a plate-shaped first joint portion 303a, a plate-shaped second joint portion 303b, and a curved connecting portion 303c. The first joint portion 303a is joined to the negative terminal 104 of the sixth battery 100. The second joint portion 303b is joined to the positive terminal 103 of the seventh battery 100. The connecting portion 303c connects the first joint portion 303a and the second joint portion 303b. Here, the intermediate bus bar 303 electrically connects the sixth and seventh batteries 100 via the intermediate block 212. For this reason, intermediate bus bar 303 is formed to have a longer overall length along stacking direction X than bus bar 302. Intermediate bus bar 303 is formed, for example, from a clad material in which copper and aluminum are bonded together, copper, or aluminum. When intermediate bus bar 303 is formed from a clad material, for example, first joint portion 303a is formed from copper, and second joint portion 303b is formed from aluminum.

[0046] As shown in FIG. 4, the second end bus bar 304 is joined to the negative terminal 104 of the twelfth battery 100 among the twelve stacked batteries 100 and to the negative electrode side connection terminal 709 of the junction unit 700. As shown in FIG. 21, the second end bus bar 304 includes a plate-shaped first joint portion 304a, a plate-shaped second joint portion 304b, a curved connecting portion 304c, and an insertion hole 304d. The first joint portion 304a is joined to the negative electrode terminal 104 of the twelfth battery 100. The second joint portion 304b is joined to the negative electrode side connection terminal 709 of the junction unit 700. The connecting portion 304c connects the first joint portion 304a and the second joint portion 304b. The insertion hole 304d is formed in the second joint portion 304b. A fastening bolt 311 is inserted into the insertion hole 304d. The second end bus bar 304 is made of, for example, copper.

[0047] The fastening bolt 311 is a first fixing member, and as shown in Fig. 4 and Fig. 21, fastens the first relay bus bar 701 of the junction unit 700 to the first end bus bar 301 to provide electrical continuity. The fastening bolt 311 is fixed to an insert nut 222 provided on the first end block 211 shown in Fig. 18. Furthermore, as shown in Fig. 4 and Fig. 21, the fastening bolt 311 provides electrical continuity between the second end bus bar 304 and the negative electrode side connection terminal 709 of the junction unit 700. The fastening bolt 311 is fixed to an insert nut 222 provided on the second end block 213 shown in Fig. 18.

[0048] As shown in FIG. 1, the busbar holder 321 integrally holds the first end busbar 301, the multiple busbars 302, the intermediate busbar 303, and the second end busbar 304. The busbar holder 321 also covers and insulates the stacked multiple batteries 100. As shown in FIG. 21, the busbar holder 321 is formed in a plate shape. Multiple openings 321a are formed in the busbar holder 321. Each opening 321a exposes the first joint portion or the second joint portion of the first end busbar 301, the multiple busbars 302, the intermediate busbar 303, or the second end busbar 304 toward the battery 100 side. Each opening 321a is larger than the first joint portion or the second joint portion of the corresponding busbar. The busbar holder 321 is formed with multiple holding portions 321b. Each of the holding portions 321b holds an end of the first joint portion or the second joint portion of the first end bus bar 301, the plurality of bus bars 302, the intermediate bus bar 303, and the second end bus bar 304. Each of the holding portions 321b is formed on the edge of the opening 321a. Each of the holding portions 321b has a linear groove along the surface of the bus bar holder 321. An end of the first joint portion or the second joint portion of the corresponding bus bar is inserted into the groove provided in each of the holding portions 321b.

[0049] (Configuration of controller unit 400) The controller unit 400 is a control unit. The controller unit 400 controls the input and output of power to and from the multiple batteries 100. The controller unit 400 is generally referred to as a battery energy control module (BECM). The controller unit 400 shown in FIGS. 1 to 6, 16, 19, and 20 includes a control board 401, a first socket 402, a second socket 403, a first connector 404, electric wires 405, a harness 406, and an external connector 407. The controller unit 400 also includes a case 411 and a cover 412. The controller unit 400 also includes a fastening member 421, a covering member 422, and a protective member 423.

[0050] The controller unit 400 is disposed on a side of the stacked batteries 100 along the stacking direction X of the stacked batteries 100. The controller unit 400 faces the junction unit 700 in the width direction Y, with the stacked batteries 100 interposed between them. In other words, the controller unit 400 is disposed so as to sandwich a pair of side surfaces of the stacked batteries 100 together with the junction unit 700. The components included in the controller unit 400 will be described below.

[0051] The control board 401 is a control member that controls the multiple batteries 100. The control board 401 is provided on the controller unit 400 side of the battery 100 in the width direction Y. The control board 401 includes a ROM that stores a program related to the control of the battery 100, a CPU that controls the battery 100, and a RAM that temporarily stores the control state of the battery 100. As shown in FIG. 19 , the control board 401 extends in the stacking direction X.

[0052] 19, the first socket 402 is attached to one end of the control board 401 in the stacking direction X, adjacent to the first end block 211 of the holding unit 200. A first connector 404 is inserted into the first socket 402.

[0053] 19, the second socket 403 is attached to the other end of the control board 401 in the stacking direction X, adjacent to the second end block 213 of the holding unit 200. A second connector 504 of the voltage detection unit 500 is inserted into the second socket 403.

[0054] First connector 404 electrically connects first socket 402 and electric wire 405. First connector 404 is configured to be attachable to and detachable from first socket 402.

[0055] The electric wire 405 is a communication line and is electrically connected to the control board 401. The electric wire 405 includes one or more conductors and an insulator covering the conductors. The electric wire 405 transmits signals related to the control of the battery 100, etc., between the control board 401 and the vehicle-side electrical equipment 1000. One end of the electric wire 405 is connected to the first connector 404. The other end of the electric wire 405 is connected to the external connection connector 407. As shown in FIG. 4 , the electric wire 405 extends from the controller unit 400 side (one end) toward the junction unit 700 side (other end) that faces the controller unit 400 side along the width direction Y of the battery 100. The electric wire 405 is covered by a harness 406. The electric wire 405 covered by the harness 406 is disposed between the controller unit 400 and the junction unit 700, facing the intermediate block 212. 4, the electric wires 405 face the intermediate block 212 via the bus bar holder 321 that covers the stacked batteries 100. That is, the electric wires 405 face the intermediate block 212 indirectly via the harness 406 and the bus bar holder 321 in the region from the controller unit 400 side to the junction unit 700 side.

[0056] As shown in FIG. 20 , the harness 406 bundles and covers a plurality of electric wires 405. As shown in FIGS. 1 and 2 , the harness 406 covering the plurality of electric wires 405 extends from the first connector 404 toward the upper surface of the cover 412. The harness 406 that extends to the upper surface of the cover 412 extends toward the intermediate block 212 of the holding unit 200 while following the upper surface of the cover 412, as shown in FIG. 4. The harness 406 that extends to the end of the intermediate block 212 extends from the controller unit 400 toward the junction unit 700 while following the upper surface of the intermediate block 212, as shown in FIG. 4. That is, the harness 406 covering the plurality of electric wires 405 is disposed between the controller unit 400 and the junction unit 700, facing the intermediate block 212, with the bus bar holder 321 shown in FIG. 1 interposed therebetween.

[0057] External connection connector 407 is a connector provided at the tip of electric wire 405 and electrically connected to an external device. As shown in Fig. 20, external connection connector 407 is connected to the tip of each electric wire 405. External connection connector 407 is connected to a socket of electric device 1000 provided in a vehicle, for example.

[0058] As shown in FIG. 19 , the case 411 is box-shaped and has an opening. The case 411 extends in the stacking direction X. The case 411 houses the control board 401. The case 411 exposes the first socket 402 to the outside at one end along the stacking direction X. The case 411 exposes the second socket 403 to the outside at the other end along the stacking direction X. The case 411 has recesses (not shown) formed on a side surface facing the first side plate 231. The recesses formed in the case 411 prevent interference with the fastening bolts 241 that fasten the first side plate 231 and the intermediate block 212, as well as interference with a protrusion formed linearly on the first side plate 231 along the stacking direction X. As shown in FIG. 19 , the fastening bolts 241 are inserted into a plurality of insertion holes 411m formed on the side surface of the case 411 along the stacking direction X. The case 411 is fixed to the first side plate 231 by fastening bolts 241, as shown in FIGS.

[0059] 2, the cover 412 is attached to the case 411. The cover 412, together with the case 411, seals the control board 401, as shown in FIGS.

[0060] As shown in FIGS. 1, 5, and 6, the fastening member 421 fastens the electric wire 405 via the covering member 422. The fastening member 421 secures the electric wire 405 to the case 721. The fastening member 421 is attached to the side of the case 721 as shown in FIG. 1. As shown in FIG. 6, the fastening member 421 includes a main body portion 421a joined to the case 721 and a fastening portion 421b that fastens the electric wire 405 covered by the covering member 422. The main body portion 421a is formed in a plate shape and is adhered to the case 721. The fastening portion 421b surrounds and fastens the fastened portion 422c of the covering member 422. The fastening portion 421b is formed in a ring shape and is attached to the main body portion 421a. The fastening portion 421b includes a cable tie. The electric wire 405 is fastened via the covering member 422 by the cable tie. For example, an Insulock (registered trademark) is used as the cable tie. The fastening portion 421b fastens the electric wire 405 by binding the electric wire 405 in a ring shape via the covering member 422. The inner diameter (outer diameter D2) of the fastening portion 421b is smaller than the outer diameter D1 of the first covering portion 422a. The fastening portion 421b restricts movement of the electric wire 405 via the covering member 422. Specifically, the fastening portion 421b restricts movement of the electric wire 405 when, for example, the electric wire 405 is pulled.

[0061] As shown in FIG. 6 , the covering member 422 covers the electric wire 405. The covering member 422 includes a first covering portion 422a, a second covering portion 422b, and a fastened portion 422c. The first covering portion 422a is a covering portion that covers the electric wire 405 and is exposed from the fastening portion 421b of the fastening member 421 on the control board 401 side. The first covering portion 422a is located between the fastening portion 421b of the fastening member 421 and the control board 401. The second covering portion 422b is exposed from the fastening portion 421b of the fastening member 421 on the external connector 407 side. The second covering portion 422b is located between the fastening portion 421b of the fastening member 421 and the external connector 407. The fastened portion 422c covers the electric wire 405 and is surrounded and fastened by the fastening portion 421b of the fastening member 421. The first covered portion 422a and the fastened portion 422c are continuous. The fastened portion 422c and the second covered portion 422b are continuous. That is, the first covered portion 422a, the fastened portion 422c, and the second covered portion 422b are integrally formed. The outer diameter D1 of the first covered portion 422a is larger than the outer diameter D2 of the fastened portion 422c.

[0062] The covering member 422 is formed, for example, by wrapping a long tape around the electric wire 405. The tape has adhesiveness on the surface facing the electric wire 405. The adhesive tape is, for example, vinyl tape. The covering member 422 is fastened by a fastening portion 421b of the fastening member 421. The vinyl tape wrapped around the electric wire 405 is provided continuously over the entire region from the first covering portion 422a to the second covering portion 422b shown in FIG. 6. In other words, the vinyl tape is also provided on a fastened portion 422c of the electric wire 405 that is fastened by the fastening portion 421b of the fastening member 421.

[0063] As shown in FIG. 6 , the covering member 422 has different outer diameters at the fastening portion 421b of the fastening member 421. The outer diameter of the first covering portion 422a of the covering member 422, which is located on the harness 406 side across the fastening portion 421b, is referred to as outer diameter D1. The outer diameter of the second covering portion 422b of the covering member 422, which is located on the external connector 407 side across the fastening portion 421b, is referred to as D2. The outer diameter D1 is set larger than the outer diameter D2. That is, the inner diameter of the fastening portion 421b, which corresponds to the outer diameter D2, is set smaller than the outer diameter D1. The outer diameters D1 and D2 of the covering member 422 are set depending on the amount of vinyl tape wrapped around the electric wire 405. The outer diameter increases as the amount of vinyl tape wrapped around the electric wire 405 increases.

[0064] The covering member 422 may be configured as follows. That is, the covering member 422 is configured by, for example, a heat-shrinkable tube. Specifically, first, a heat-shrinkable tube is inserted into the region of the electric wire 405 where the first covering portion 422a to the second covering portion 422b shown in FIG. 6 should be provided, and the heat-shrinkable tube is heat-shrunk. Next, a new heat-shrinkable tube is inserted into the region of the electric wire 405 covered by the heat-shrinkable tube where the first covering portion 422a shown in FIG. 6 should be provided, and the new heat-shrinkable tube is heat-shrunk. That is, the covering member 422 is configured by a cylindrical tube with a step. The electric wire 405 covered by the heat-shrinkable tube is fastened by the fastening portion 421b of the fastening member 421.

[0065] As shown in FIG. 6 , the protective member 423 protects the electric wire 405. The protective member 423 is formed, for example, of a cylindrical vinyl tube. The protective member 423 covers the outer periphery of the second covering portion 422b of the electric wire 405, which faces the first covering portion 422a via the fastened portion 422c, and is joined to the covering member 422. The protective member 423 covers the outer periphery of the electric wire 405 on a side farther from the control board 401 than the fastened portion 422c. The protective member 423 is provided along the electric wire 405 up to the vicinity of the external connection connector 407 provided at the tip of the electric wire 405. A portion of the protective member 423 is covered by the second covering portion 422b of the covering member 422 and is joined to the second covering portion 422b. 6, an inner peripheral surface 423a of the protection member 423 faces an outer peripheral surface 405a of the electric wire 405 with a gap therebetween. In FIG. 6, the outer diameter of the protection member 423 is illustrated as being smaller than the outer diameter of the first covering portion 422a of the covering member 422. In some embodiments, the outer diameter of the protection member 423 may be larger than the outer diameter of the first covering portion 422a of the covering member 422.

[0066] (Configuration of voltage detection unit 500) The voltage detection unit 500 detects the voltage of the battery 100 based on the control of the controller unit 400. The voltage detection unit 500 shown in Figures 1, 2, 4, 5, 7, 8, 16, 19, and 21 includes a voltage detection terminal 501, an electric wire 502, a harness 503, and a second connector 504. The components included in the voltage detection unit 500 will be described below.

[0067] The voltage detection terminal 501 has sufficient conductivity and is formed in a plate shape. As shown in Fig. 4 and Fig. 21 , the voltage detection terminal 501 is joined to the first end bus bar 301, the plurality of bus bars 302, the intermediate bus bar 303, and the second end bus bar 304 of the bus bar unit 300, respectively.

[0068] The electric wires 502 are connected to the voltage detection terminals 501 and are second communication lines that are electrically connected to the control board 401. As shown in FIGS. 4 and 21 , the electric wires 502 are connected to each voltage detection terminal 501. The electric wires 502 are provided on the same plane as the electric wires 405 of the controller unit 400 and the stacked batteries 100. The "on the same plane" corresponds to the top surface of the battery 100 to which the positive terminal 103 and the negative terminal 104 are attached. As shown in FIG. 4 , each electric wire 502 extends in the stacking direction X toward the end of the stacked batteries 100, i.e., toward the second end block 213. That is, the electric wires 502 are perpendicular to the electric wires 405 that extend in the width direction Y while facing the intermediate block 212. After reaching the second end block 213, each electric wire 502 extends in the width direction Y toward the control board 401 of the controller unit 400.

[0069] 21, harness 503 bundles and covers each of electric wires 502 at the end of bus bar holder 321 of bus bar unit 300. Harness 503 covering each of electric wires 502 extends to second socket 403 of controller unit 400 as shown in FIG.

[0070] The second connector 504 is connected to each of the electric wires 502 covered by the harness 503. The second connector 504 is inserted into the second socket 403 of the controller unit 400.

[0071] (Configuration of temperature measurement unit 600) The temperature measurement unit 600 measures the temperature of the battery 100 based on the control of the controller unit 400. The temperature measurement unit 600 shown in Figures 1, 2, 4, 16, 19, and 20 includes a temperature sensor 601 and an electric wire 602. The components included in the temperature measurement unit 600 will be described below.

[0072] As shown in Fig. 4, the temperature sensor 601 is joined to one of the six batteries 100 stacked between the first end block 211 and the intermediate block 212. As an example, in Fig. 4, the temperature sensor 601 is joined to the lid 102 of the battery 100 that is the fourth battery 100 when looking from the first end block 211 to the intermediate block 212. As shown in Fig. 4, the temperature sensor 601 is joined to one of the six batteries 100 stacked between the intermediate block 212 and the second end block 213. As an example, in Fig. 4, the temperature sensor 601 is joined to the lid 102 of the battery 100 that is the third battery 100 when looking from the intermediate block 212 to the second end block 213.

[0073] The electric wire 602 is a third communication line that is joined to the temperature sensor 601 and is electrically connected to the control board 401. As shown in FIGS. 4 and 20 , the electric wire 602 is joined to each temperature sensor 601. The electric wire 602 is provided on the same surface as the electric wire 405 of the controller unit 400, which is formed by stacking a plurality of batteries 100. This same surface corresponds to the upper surface of the battery 100 to which the positive terminal 103 and the negative terminal 104 are attached. Each electric wire 602 extends in the stacking direction X from the temperature sensor 601 toward the intermediate block 212. In the region from the temperature sensor 601 to the intermediate block 212, each electric wire 602 intersects at right angles with the electric wire 405 of the controller unit 400. Each electric wire 602 is attached to the harness 406 of the controller unit 400. Each of the electric wires 602 extends along the width direction Y of the intermediate block 212 and the battery 100 to the first connector 404 of the controller unit 400. Each of the electric wires 602 is joined to the first connector 404.

[0074] (Configuration of junction unit 700) The junction unit 700 is an input / output unit through which power is input and output from the plurality of batteries 100. The junction unit 700 electrically connects the plurality of batteries 100 and the electrical device 1000 based on control by the controller unit 400. The junction unit 700 is generally referred to as a junction box. The junction unit 700 shown in FIGS. 1 to 10 , 16 , 19 , and 20 includes a first relay bus bar 701, a second relay bus bar 702, a fuse 703, a third relay bus bar 704, a relay 705, a fourth relay bus bar 706, a current sensor 707, a positive electrode side connection terminal 708, and a negative electrode side connection terminal 709. The junction unit 700 also includes an electric wire 711 and an electric wire 712. The junction unit 700 also includes a case 721, an insert nut 722, and a fastening bolt 723. The components included in the junction unit 700 will be described below.

[0075] As shown in FIG. 4, the first relay bus bar 701 is joined to the first end bus bar 301. As shown in FIG. 20, the first relay bus bar 701 includes a plate-shaped first joint portion 701a, a plate-shaped second joint portion 701b, and a curved connecting portion 701c. The first joint portion 701a is formed with a first insertion hole 701d into which a fastening bolt 311 of the bus bar unit 300 is inserted. The second joint portion 701b is formed with a second insertion hole 701e into which a fastening bolt 723 is inserted. A plate-shaped protrusion 701f protruding toward the case 721 is formed at an end of the second joint portion 701b. The first joint portion 701a is joined to the first end bus bar 301 via the fastening bolt 311. The second joint portion 701b is connected to the second relay bus bar 702 via the fastening bolt 723. The connecting portion 701c connects the first joint portion 701a and the second joint portion 701b together. The connecting portion 701c protrudes toward the battery 100. The first relay bus bar 701 is made of, for example, copper.

[0076] As shown in FIGS. 16 and 20 , the second relay bus bar 702 provides electrical continuity between the first relay bus bar 701 and the fuse 703. The second relay bus bar 702 is formed by bending both ends of a long plate. A rectangular connection portion 702a is formed at the upper end of the second relay bus bar 702. A second joint portion 701b of the first relay bus bar 701 is connected to the connection portion 702a. An insertion hole 702b is formed in the connection portion 702a, into which a fastening bolt 723 is inserted. The second relay bus bar 702 is made of, for example, copper.

[0077] 16 and 20, fuse 703 melts when a current exceeding a predetermined value is input for a predetermined period of time, thereby interrupting electrical continuity between the plurality of batteries 100 and electrical device 1000. Fuse 703 is connected between second relay bus bar 702 and third relay bus bar 704.

[0078] 16 and 20, the third relay bus bar 704 electrically connects the fuse 703 and the relay 705. The third relay bus bar 704 is formed in a plate shape. The third relay bus bar 704 is made of, for example, copper.

[0079] 16 and 20, the relay 705 electrically connects or disconnects the plurality of batteries 100 and the electrical device 1000 based on control by the controller unit 400. The relay 705 is connected between the third relay bus bar 704 and the fourth relay bus bar 706. In other words, the relay 705 is indirectly connected to the plurality of batteries 100.

[0080] 16 and 20, the fourth relay bus bar 706 electrically connects the relay 705 and the current sensor 707. The fourth relay bus bar 706 is formed in a plate shape. The fourth relay bus bar 706 is made of, for example, copper.

[0081] 16 and 20, the current sensor 707 measures the current value of the power output from the plurality of batteries 100 based on the control of the controller unit 400. The current sensor 707 is connected between the fourth relay bus bar 706 and the positive electrode side connection terminal 708. In other words, the current sensor 707 is indirectly connected to the plurality of batteries 100.

[0082] As shown in FIG. 1 , the positive connection terminal 708 is connected to a power cable of the electric device 1000. That is, the positive connection terminal 708 corresponds to an input / output terminal for power on the positive side of the battery pack 1. As shown in FIGS. 16 and 20 , the positive connection terminal 708 is formed by bending both ends of a long plate. The positive connection terminal 708 has a rectangular connection portion 708a formed at its upper end. The power cable of the electric device 1000 is connected to the connection portion 708a. An insertion hole 708b for inserting a fastening bolt 723 is formed in the connection portion 708a. The positive connection terminal 708 is electrically connected to the power cable of the electric device 1000 via the fastening bolt 723. The positive connection terminal 708 is made of, for example, copper.

[0083] The negative electrode side connection terminal 709 is a bus bar. The negative electrode side connection terminal 709 electrically connects the plurality of batteries 100 electrically connected by the bus bars 302, the intermediate bus bar 303, etc., to an external device (a power cable of the electrical device 1000). As shown in FIG. 1, the power cable of the electrical device 1000 is connected to the negative electrode side connection terminal 709. That is, the negative electrode side connection terminal 709 corresponds to an input / output terminal for power on the negative side of the battery pack 1. As shown in FIG. 4, the negative electrode side connection terminal 709 is joined to the second end bus bar 304. As shown in FIGS. 8, 9, and 20, the outer shape of the negative electrode side connection terminal 709 is the same as the outer shape of the first relay bus bar 701. As shown in FIG. 4, the negative electrode side connection terminal 709 is formed in an elongated shape and extends from the battery 100 toward the case 721. That is, the negative electrode side connection terminal 709 extends elongatedly in a width direction Y (intersecting direction) that intersects with the stacking direction X of the battery 100. As shown in Fig. 9, the negative electrode side connection terminal 709 includes a plate-shaped first joint portion 709a, a plate-shaped second joint portion 709b, and a curved joining portion 709c.

[0084] A first insertion hole 709d (first insertion hole) into which a fastening bolt 311 is inserted is formed in the first joint portion 709a of the negative electrode side connection terminal 709. The first joint portion 709a is joined to the second end bus bar 304 via the fastening bolt 311 or the like inserted in the first insertion hole 709d. A second insertion hole 709e (second insertion hole) into which a fastening bolt 723 is inserted is formed in the second joint portion 709b. The second joint portion 709b is connected to the power cable on the electric device 1000 side via the fastening bolt 723 or the like inserted in the second insertion hole 709e. A connecting portion 709c of the negative electrode side connection terminal 709 connects the first joint portion 709a and the second joint portion 709b. The connecting portion 709c protrudes toward the battery 100 side.

[0085] As shown in FIG. 8, a rod-shaped protrusion 709f protruding toward the case 721 is formed at the end of the second joint portion 709b. The protrusion 709f extends in the short direction of the negative electrode side connection terminal 709 at the tip end side of the longitudinal direction of the negative electrode side connection terminal 709 and protrudes toward the case 721. For example, the length of the protrusion 709f protruding toward the case 721 side (the lower side along the height direction Z) is relatively longer than the length along the short direction of the negative electrode side connection terminal 709 (the stacking direction X). The protrusion 709f is formed on the side edge 709b1 of the negative electrode side connection terminal 709, which is the tip end farthest from the battery 100. As shown in FIG. 8, the protrusion 709f partially protrudes from the side edge 709b1 toward the case 721 side. The protrusion 709f is formed in the center of the side edge 709b1. The negative electrode side connection terminal 709 is made of, for example, copper.

[0086] The electric wire 711 is a fourth communication line that is joined to the relay 705 and is electrically connected to the control board 401. The electric wire 711 is shown in FIG. 20 , and transmits a signal from the control board 401 to the relay 705. One end of the electric wire 711 is connected to the first connector 404. The other end of the electric wire 711 is connected to the relay 705. The electric wire 711 is arranged between the controller unit 400 and the junction unit 700 so as to face the intermediate block 212 while being bundled into the harness 406.

[0087] The electric wire 712 is joined to the current sensor 707 and is a fifth communication line that is electrically connected to the control board 401. The electric wire 712 is shown in FIG. 20 , and transmits a signal from the current sensor 707 to the control board 401. One end of the electric wire 712 is connected to the first connector 404. The other end of the electric wire 712 is connected to the current sensor 707. The electric wire 712 is arranged between the controller unit 400 and the junction unit 700 so as to face the intermediate block 212 while being bundled into the harness 406.

[0088] As shown in Fig. 16 , the case 721 houses the second relay bus bar 702, the fuse 703, the third relay bus bar 704, the relay 705, the fourth relay bus bar 706, the current sensor 707, and the positive electrode side connection terminal 708. The case 721 is a holding member and holds the negative electrode side connection terminal 709 and the like. The case 721 is formed of an insulating material and has insulating properties. A terminal (a terminal of a power cable for the electrical device 1000) is attached to the case 721 via the negative electrode side connection terminal 709. The terminal of the power cable is, for example, a bus bar made of a metal plate.

[0089] As shown in FIG. 4, the case 721 is provided along the stacking direction X of the multiple batteries 100. As shown in FIG. 10, a rectangular parallelepiped first protrusion 721a is formed on the upper surface of the case 721 adjacent to the first end block 211. The first protrusion 721a protrudes from the upper surface of the case 721 in the height direction Z. A rectangular recessed first housing portion 721b is formed on the upper surface of the first protrusion 721a. The first housing portion 721b is formed by cutting out a portion of the first protrusion 721a facing the second side plate 232 to the very edge of the first protrusion 721a. As shown in FIG. 10, the first housing portion 721b has a first inner side surface 721b1 and a second inner side surface 721b2 located on both sides in the stacking direction X. Similarly, as shown in FIG. 10, the first housing portion 721b has a third inner side surface 721b3 located on the outer side of the battery pack 1 in the width direction Y. On the other hand, the first accommodating portion 721b does not have an inner surface in a portion located inside the battery pack 1. That is, the first accommodating portion 721b has inner surfaces on three sides of the first protruding portion 721a, excluding a portion facing the second side plate 232.

[0090] As shown in FIGS. 4, 10, and 20, the second joint portion 701b of the first relay bus bar 701 is attached to the first accommodating portion 721b of the case 721. As shown in FIG. 10, an insertion portion 721c is formed in the first accommodating portion 721b. The insertion portion 721c is located in the vicinity of the third inner side surface 721b3 in the first accommodating portion 721b. The protrusion portion 701f of the first relay bus bar 701 is inserted into the insertion portion 721c. An insert nut 722 is embedded in the center of the first accommodating portion 721b.

[0091] 10, a rectangular parallelepiped second protrusion 721d is formed on the upper surface of the case 721 adjacent to the second end block 213. The second protrusion 721d protrudes from the upper surface of the case 721 in the height direction Z. A rectangular recessed second accommodating portion 721e and a third accommodating portion 721f are formed on the upper surface of the second protrusion 721d and are aligned along the stacking direction X.

[0092] 4, 10, and 20, a connection portion 708a of the positive electrode side connection terminal 708 is attached to the second housing portion 721e of the case 721. An insert nut 722 is embedded in the center of the second housing portion 721e, as shown in FIG.

[0093] The third housing portion 721f is a housing portion that houses the negative electrode side connection terminal 709. As shown in FIG. 10, the third housing portion 721f is located on the second protrusion 721d closer to the second end block 213 than the second housing portion 721e. The third housing portion 721f is formed by cutting out a portion of the second protrusion 721d that faces the second side plate 232 all the way to the end of the second protrusion 721d. As shown in FIG. 10, the third housing portion 721f has a first inner surface 721f1 and a second inner surface 721f2 located on opposite sides in the stacking direction X. Similarly, the third housing portion 721f has a third inner surface 721f3 located on the outer side of the battery pack 1 in the width direction Y. The first inner surface 721f1, the second inner surface 721f2, and the third inner surface 721f3 face, across a gap, the side surface (thickness portion) of the second joint portion 709b of the negative electrode side connection terminal 709. On the other hand, the third accommodating portion 721f does not have an inner surface in a portion located inside the battery pack 1. In other words, the third accommodating portion 721f has inner surfaces on three sides of the second protrusion 721d excluding a portion facing the second side plate 232.

[0094] As shown in FIGS. 4, 10, and 11, the second joint portion 709b of the negative connection terminal 709 is attached to the third housing portion 721f of the case 721. That is, the negative connection terminal 709 is housed in the third housing portion 721f. As shown in FIG. 10, the third housing portion 721f is formed with an insertion portion 721g. The insertion portion 721g is an attachment portion and is formed by a hole formed in the third housing portion 721f of the case 721. The attachment portion functions as a restriction portion that suppresses displacement of the negative connection terminal 709 by restricting movement of the protrusion 709f. The insertion portion 721g is located near the third inner surface 721f3 in the third housing portion 721f. The protrusion 709f of the negative connection terminal 709 is inserted into and attached to the insertion portion 721g. A gap is provided between the insertion portion 721g and the protrusion 709f of the negative connection terminal 709. That is, the interior of the insertion portion 721g is sufficiently larger than the outer shape of the protrusion 709f of the negative connection terminal 709. Therefore, the protrusion 709f of the negative connection terminal 709 is attached to the insertion portion 721g with at least a partial gap provided. An insert nut 722 is embedded in the center of the third accommodation portion 721f.

[0095] 16, the fastening bolts 241 are inserted into a plurality of insertion holes 721m formed on the side surface of the case 721 along the stacking direction X. The case 721 is fixed to the second side plate 232 by the fastening bolts 241, as shown in FIG.

[0096] FIG. 12 shows the third housing portion 731f of the case 731 according to Modification 1 of the case 721 and the negative electrode side connection terminal 709. The second joint portion 709b of the negative electrode side connection terminal 709 is attached to the third housing portion 731f formed in the second protrusion portion 731d of the case 731. That is, the negative electrode side connection terminal 709 is housed in the third housing portion 731f. The third housing portion 731f of the case 731 has a protrusion 731h formed on one side surface along the width direction Y of the battery 100. The protrusion 731h protrudes from the side surface of the third housing portion 731f in the stacking direction X of the battery 100 toward the second joint portion 709b of the negative electrode side connection terminal 709. The third housing portion 731f of the case 731 has a protrusion 731i formed on the other side surface along the width direction Y of the battery 100. The protrusion 731i protrudes from the side surface of the third housing portion 731f in the stacking direction X of the battery 100 toward the second joint portion 709b of the negative electrode side connecting terminal 709. The protrusions 731h and 731i face each other along the stacking direction X of the battery 100.

[0097] As shown in Fig. 12, an insertion portion 731g is formed in the third housing portion 731f of the case 731. The insertion portion 731g is an attachment portion and is configured as a hole formed in the third housing portion 731f of the case 731. As shown by the dashed line in Fig. 12, the protrusion 709f of the negative electrode side connection terminal 709 is inserted into and attached to the insertion portion 731g. A gap is provided between the insertion portion 731g and the protrusion 709f of the negative electrode side connection terminal 709. The insertion portion 731g is sufficiently spaced apart from the protrusions 731h and 731i in the width direction Y of the battery 100. A fastening bolt 723 is positioned between the insertion portion 731g and the protrusions 731h and 731i.

[0098] As shown in FIG. 12, in the third housing portion 731f of the case 731, the second joint portion 709b of the negative electrode side connecting terminal 709 is positioned by the protrusion 731h, the protrusion 731i, and the insertion portion 731g.

[0099] FIG. 13 shows a third housing portion 741f of a case 741 according to Modification 2 of the case 721 and a negative-side connecting terminal 709. The second joint portion 709b of the negative-side connecting terminal 709 is attached to the third housing portion 741f formed in the second protrusion 741d of the case 741. That is, the negative-side connecting terminal 709 is housed in the third housing portion 741f. As shown by the dashed line in FIG. 13, the protrusion 709f of the negative-side connecting terminal 709 contacts the side surface of the third housing portion 741f of the case 741 along the stacking direction X of the battery 100. That is, the third housing portion 741f of the case 741 does not have an insertion portion into which the protrusion 709f of the negative-side connecting terminal 709 is inserted, and instead positions the negative-side connecting terminal 709 by bringing the protrusion 709f of the negative-side connecting terminal 709 into contact with the side surface of the battery 100 along the stacking direction X.

[0100] Insert nut 722 is another anchoring member, and is embedded in first housing portion 721b, second housing portion 721e, and third housing portion 721f. Fastening bolt 723, which is a second fixing member, is anchored to insert nut 722 embedded in third housing portion 721f via negative electrode side connection terminal 709. As a modified example of the embodiment, instead of insert nut 722, another anchoring portion equivalent to a thread groove for anchoring fastening bolt 723 may be formed in third housing portion 721f.

[0101] 16 and 20 , the fastening bolt 723 is a second fixing member, and together with the insert nut 722, fastens the first relay bus bar 701 and the second relay bus bar 702, thereby enabling electrical continuity between the first relay bus bar 701 and the second relay bus bar 702. Furthermore, together with the insert nut 722, the fastening bolt 723 fastens the positive electrode side connection terminal 708 and the power cable of the electric device 1000, thereby enabling electrical continuity between the positive electrode side connection terminal 708 and the power cable of the electric device 1000. Similarly, the fastening bolt 723 together with the insert nut 722 fastens the negative electrode side connection terminal 709 and the power cable of the electric device 1000, thereby enabling electrical continuity between the negative electrode side connection terminal 709 and the power cable of the electric device 1000.

[0102] 22, a controller unit 400 and a junction unit 700 are provided along the stacking direction X of the stacked batteries 100. The controller unit 400 and the junction unit 700 face each other in the width direction Y of the batteries 100, with the stacked batteries 100 interposed therebetween.

[0103] The battery pack 2 shown in Fig. 23 is a first modification of the layout of the components of the battery pack 1 shown in Fig. 22. That is, the battery pack 2 shown in Fig. 23 is configured by changing the arrangement of the components of the battery pack 1 shown in Fig. 22. In the battery pack 2 shown in Fig. 23, the controller unit 400 and the junction unit 700 are arranged next to each other along the width direction Y of the battery 100.

[0104] The battery pack 3 shown in Fig. 24 is a second modification regarding the layout of the components of the battery pack 1 shown in Fig. 22. That is, the battery pack 3 shown in Fig. 24 is configured by changing the arrangement of the components of the battery pack 1 shown in Fig. 22. In the battery pack 3 shown in Fig. 24, the controller unit 400 and the junction unit 700 are arranged next to each other along the stacking direction X of the batteries 100.

[0105] (Effects of battery pack 1 according to the embodiment) The effects of the battery pack 1 of the embodiment will be described.

[0106] The fastening bolts 241 (an example of a fastening member) directly fasten at least one of the first end block 211 and the second end block 213 (an example of a holding member) to the case 721 (an example of a housing) of the junction unit 700 (an example of an input / output unit). With this configuration, for example, the first end block 211 and the second end block 213 and the case 721 of the junction unit 700 are directly fastened together without using a flexible buffer member (e.g., a rubber snap), thereby firmly joining them together and improving the ease of assembly of the battery pack 1. Furthermore, with this configuration, the battery pack 1 can be made smaller than when the first end block 211 and the second end block 213 and the case 721 of the junction unit 700 are indirectly fastened together using a rubber snap or the like.

[0107] The junction unit 700 includes a relay. With this configuration, the operating sound of the relay 705 may be transmitted to the surrounding area via the second end block 213, etc. On the other hand, if the battery pack 1 is placed in a location sufficiently far from the passenger area (driver's seat, etc.) of a vehicle, for example, the passengers (driver, etc.) of the vehicle will not be bothered by the operating sound of the relay 705.

[0108] The first end block 211, the second end block 213, and the case 721 are fastened together along the width direction Y of the battery 100 by fastening bolts 241. With this configuration, for example, the first end block 211, the second end block 213, and the case 721 of the junction unit 700 can be directly fixed together along the width direction Y of the battery 100.

[0109] The first end block 211, the second end block 213, and the case 721 are fastened together by fastening bolts 241 along the stacking direction X of the battery 100. With this configuration, for example, the first end block 211, the second end block 213, and the case 721 of the junction unit 700 can be directly fixed together along the stacking direction X of the battery 100.

[0110] The controller unit 400 is provided along the stacking direction X. The junction unit 700 and the controller unit 400 face each other along the width direction Y of the battery 100, with the stacked batteries 100 interposed therebetween. The battery pack 1 of the embodiment can adopt the above-described layout depending on the specifications of, for example, a vehicle in which the battery pack 1 is provided.

[0111] In the first modification of the embodiment, the controller unit 400 can be provided along the stacking direction X. The junction unit 700 and the controller unit 400 can be arranged next to each other along the width direction Y of the battery 100. The battery pack of the first modification of the embodiment can adopt the above-described layout depending on the specifications of, for example, a vehicle in which the battery pack is to be installed.

[0112] In the second modification of the embodiment, the junction unit 700 and the controller unit 400 can be disposed adjacent to each other along the stacking direction X. The battery pack of the second modification of the embodiment can adopt the above-described layout depending on the specifications of, for example, a vehicle in which the battery pack is installed. (Battery Assembly of Other Embodiments) The battery pack of the present invention is not limited to the configurations of the battery packs 1, 2, and 3 described in the embodiments, but can be configured appropriately based on the content described in the claims.

[0113] The battery 100 included in the battery pack 1 is not limited to a lithium ion battery. The battery 100 can be, for example, a nickel-metal hydride battery or a lead battery. The battery 100 is not limited to a secondary battery. The battery 100 can be, for example, a primary battery. The current collector of the battery 100 can be either a wound type or a stacked type.

[0114] The embodiments are described in detail or simply to make the present invention easier to understand, and do not necessarily include all of the components described, or may include components not shown. Also, some of the components of the embodiments may be deleted, replaced with components of other embodiments, or combined with components of other embodiments. [Explanation of symbols]

[0115] 1: battery pack, 100: battery, 211: first end block (holding member), 213: second end block (holding member), 241: fastening bolt (fastening member), 400: controller unit (control unit), 700: junction unit (input / output unit), 705: relay, 721: case (housing), X: stacking direction (of battery 100), Y: width direction (crossing direction intersecting with stacking direction X of battery 100)

Claims

1. A plurality of stacked batteries; a holding member that extends in a direction intersecting the stacking direction at an end of the plurality of batteries along the stacking direction and holds the plurality of batteries; a control unit that controls the plurality of batteries; an input / output unit provided along the stacking direction, through which power from the plurality of batteries is input / output via the control unit; a fastening member that directly fastens the holding member to a housing of the input / output unit; A battery pack having:

2. The input / output unit includes a relay. The battery pack according to claim 1 .

3. the holding member and the housing are fastened together along the intersecting direction by the fastening member; The battery pack according to claim 1 or 2.

4. the holding member and the housing are fastened together along the stacking direction by the fastening member; The battery pack according to claim 1 .

5. The control unit is provided along the stacking direction, the input / output unit and the control unit face each other along the intersecting direction via the stacked batteries. The battery pack according to claim 1 .

6. The control unit is provided along the stacking direction, The input / output unit and the control unit are adjacent to each other along the intersecting direction. The battery pack according to claim 1 .

7. The control unit is provided along the stacking direction, The input / output unit and the control unit are adjacent to each other along the stacking direction. The battery pack according to claim 1 .

Images