Classifications

• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
  • H01M50/204—Racks, modules or packs for multiple batteries or multiple cells
  • H01M50/207—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape
  • H01M50/209—Racks, modules or packs for multiple batteries or multiple cells characterised by their shape adapted for prismatic or rectangular cells
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/20—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders
  • H01M50/298—Mountings; Secondary casings or frames; Racks, modules or packs; Suspension devices; Shock absorbers; Transport or carrying devices; Holders characterised by the wiring of battery packs
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/50—Current conducting connections for cells or batteries
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
  • H01M50/503—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing characterised by the shape of the interconnectors
• • H—ELECTRICITY
  • H01—ELECTRIC ELEMENTS
  • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
  • H01M50/00—Constructional details or processes of manufacture of the non-active parts of electrochemical cells other than fuel cells, e.g. hybrid cells
  • H01M50/50—Current conducting connections for cells or batteries
  • H01M50/502—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing
  • H01M50/507—Interconnectors for connecting terminals of adjacent batteries; Interconnectors for connecting cells outside a battery casing comprising an arrangement of two or more busbars within a container structure, e.g. busbar modules
• • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
  • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
  • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
  • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
  • Y02E60/10—Energy storage using batteries

Definitions

• the present invention relates to a battery pack.
• a battery pack has been known that has a bus bar (conductor), a harness connected to the bus bar, and a holding member (plastic plate) that holds the bus bar and the harness.
• the harness includes a terminal (voltage detection terminal) connected to the bus bar, and an electric wire connected to the terminal (see, for example, Patent Document 1).
• the battery pack of the present invention includes a plurality of batteries including electrode terminals, a bus bar connected to the electrode terminal of one of the batteries and the electrode terminal of another battery, or connected to the electrode terminal of one of the batteries and an external electrical device, a harness including a terminal connected to the bus bar and an electric wire connected to the terminal, and a holding member that holds the bus bar.
• the holding member includes a base located between the battery and the bus bar and extending along the plurality of batteries, and a protrusion connected to the base and extending in a direction away from the battery.
• the harness includes a first connection portion connecting the bus bar and the terminal, and a second connection portion connected to the first connection portion and connecting the terminal and the electric wire.
• the protrusion includes a first wall portion adjacent to the first connection portion along a direction intersecting the direction away from the battery, and a second wall portion adjacent to the second connection portion along a direction intersecting the direction away from the battery.
• the first wall portion and the second wall portion are adjacent to at least one of the harnesses.
• the second wall portion includes a portion that extends in a direction away from the battery than the second connection portion.
• a battery pack can be obtained that adequately protects the harness connected to the bus bar.
• FIG. 1 is a perspective view showing a battery pack 1 according to an embodiment
• 2 is a perspective view showing a state in which a bus bar cover 312 is removed from the battery pack 1 of FIG. 1
• 2 is a top view showing the battery pack 1 of FIG. 1 with a bus bar cover 312 and a bus bar holder 311 removed.
• FIG. 2 is a perspective view showing a main part of the battery pack 1.
• FIG. 2 is a side view showing a main part of the battery pack 1.
• 5 is an enlarged, partially see-through perspective view of a main portion of the battery pack 1 of FIG. 4
• FIG. 6 is an enlarged, partially see-through side view of a main portion of the battery pack 1 of FIG. 5 .
• FIG. 2 is a top view showing a main part of the battery pack 1.
• FIG. 2 is an exploded view showing a main part of the battery pack 1.
• FIG. 4 is a perspective view showing a bus bar holder 311 in which a plurality of electric wires 402 are bundled and arranged.
• 13 is a perspective view showing a bus bar holder 311 in which one electric wire is located on the inter-cell bus bar 302 side relative to the tip of an upper surface 311e1 of a second wall portion 311e.
• FIG. FIG. 4 is a side view showing a main part of a battery pack according to a first modified example of the embodiment.
• FIG. 11 is a perspective view showing a main part of a battery pack according to a second modified example of the embodiment.
• FIG. 11 is a perspective view showing a main part of a battery pack according to a third modified example of the embodiment.
• FIG. 11 is a perspective view showing a main part of a battery pack according to a fourth modified example of the embodiment.
• FIG. 13 is a perspective view showing a main part of a battery pack according to a fifth modified example of the embodiment.
• FIG. 13 is a perspective view showing a main part of a battery pack according to a sixth modified example of the embodiment.
• FIG. 13 is a perspective view showing a main part of a battery pack according to a seventh modified example of the embodiment.
• 2 is a perspective view showing a plurality of batteries 100 and a holding unit 200, with some of the components of the holding unit 200 disassembled in the width direction Y and the stacking direction X.
• FIG. 20 is a perspective view showing a state in which a first side plate 231, a second side plate 232 and a fastening bolt 241 have been removed from FIG. 19, and the components of the battery 100 and the holding unit 200 have been disassembled in the stacking direction X.
• FIG. FIG. 2 is a perspective view showing the busbar unit 300, the voltage detection unit 400, and the temperature measurement unit 500.
• the stacking direction X, width direction Y, and height direction Z of the battery pack 1 will change.
• the threads on the outer surface of the fastening bolt and the grooves on the inner surface of the insert nut are omitted from the illustration.
• FIG. 1 is a perspective view showing a battery pack 1 of an embodiment.
• FIG. 2 is a perspective view showing the battery pack 1 of FIG. 1 with the bus bar cover 312 removed.
• FIG. 3 is a top view showing the battery pack 1 of FIG. 1 with the bus bar cover 312 and the bus bar holder 311 removed.
• FIG. 4 is a perspective view showing the main parts of the battery pack 1.
• FIG. 5 is a side view showing the main parts of the battery pack 1.
• FIG. 6 is an enlarged and partially see-through perspective view of the main parts of the battery pack 1 of FIG. 4.
• FIG. 7 is an enlarged and partially see-through side view of the main parts of the battery pack 1 of FIG. 5.
• FIG. 8 is a top view showing the main parts of the battery pack 1.
• FIG. 8 is a top view showing the main parts of the battery pack 1.
• FIG. 10 is a perspective view showing a bus bar holder 311 in which a plurality of electric wires 402 are bundled and arranged.
• FIG. 11 is a perspective view showing a busbar holder 311 in which one electric wire is located on the inter-cell busbar 302 side from the tip of the upper surface 311e1 of the second wall portion 311e.
• Figure 12 is a side view showing the main parts of the battery pack of the first modified embodiment.
• Figure 13 is a perspective view showing the main parts of the battery pack of the second modified embodiment.
• Figure 14 is a perspective view showing the main parts of the battery pack of the third modified embodiment.
• Figure 15 is a perspective view showing the main parts of the battery pack of the fourth modified embodiment.
• Figure 16 is a perspective view showing the main parts of the battery pack of the fifth modified embodiment.
• Figure 17 is a perspective view showing the main parts of the battery pack of the sixth modified embodiment.
• Figure 18 is a perspective view showing the main parts of the battery pack of the seventh modified embodiment.
• Figure 19 is a perspective view of multiple batteries 100 and a holding unit 200, with some of the components of the holding unit 200 disassembled in the width direction Y and stacking direction X.
• Figure 20 is a perspective view of the battery 100 and holding unit 200, with the first side plate 231, the second side plate 232, and the fastening bolt 241 removed from Figure 19, and with the components of the battery 100 and holding unit 200 disassembled in the stacking direction X.
• Figure 21 is a perspective view showing the bus bar unit 300, the voltage detection unit 400, and the temperature measurement unit 500.
• the battery pack 1 is configured, for example, as a power source for operating a motor to run a vehicle.
• the battery pack 1 may also be configured, for example, as a power source for operating electrical equipment mounted on the vehicle.
• the battery pack 1 includes a plurality of batteries 100, a holding unit 200 that holds the plurality of batteries 100, and a bus bar unit 300 that electrically connects the plurality of batteries 100.
• the battery pack 1 also includes a voltage detection unit 400 that detects the voltage of the batteries 100, and a temperature measurement unit 500 that measures the temperature of the batteries 100. The components included in the battery pack 1 will be described below.
• the batteries 100 shown in Fig. 2, Fig. 3, Fig. 19, and Fig. 20 are stacked in a stacking direction X via a holding unit 200. As shown in Fig. 3, for example, 20 batteries 100 are stacked.
• the batteries 100 are formed of, for example, lithium ion secondary batteries.
• the batteries 100 include a current collector and an electrolyte.
• the battery 100 includes a container 101, a lid 102, a positive terminal 103 (electrode terminal), a negative terminal 104 (electrode terminal), and a safety valve 105.
• the components included in the battery 100 will be described below.
• the battery 100 is formed in a rectangular parallelepiped shape.
• a positive terminal 103 and a negative terminal 104 are provided on the upper surface 100a of the battery 100 along the stacking direction X.
• the upper surface 100a corresponds to the upper surface of the battery 100 in FIG. 20.
• the upper surface 100a is formed in a rectangular shape.
• the length of the upper surface 100a along the width direction Y of the battery 100 is longer than the length of the upper surface 100a along the stacking direction X of the battery 100.
• the upper surface 100a faces the busbar unit 300 shown in FIG. 2.
• Two side surfaces 100b along the stacking direction X of the battery 100 face each other perpendicularly to the upper surface 100a.
• the side surfaces 100b are formed in a rectangular shape.
• the length of the side surfaces 100b along the height direction Z of the battery 100 is longer than the length of the side surfaces 100b along the stacking direction X of the battery 100.
• the two main surfaces 100c of the battery 100 that face each other in the stacking direction X are in contact with the cell spacers 202 of the holding unit 200.
• the current collector of the battery 100 corresponds to a charge/discharge body to/from which electric power is input/output.
• the current collector of the battery 100 is configured by winding or stacking a positive electrode and a negative electrode with a separator interposed therebetween.
• the container 101 contains the current collector and an electrolyte.
• the lid 102 together with the container 101, seals the current collector and the electrolyte.
• the lid 102 is joined to the container 101.
• the positive electrode terminal 103 and the negative electrode terminal 104 relay the input/output of electric power between the current collector and the electric device.
• the positive electrode terminal 103 and the negative electrode terminal 104 are attached to the lid 102.
• the safety valve 105 breaks outward from the battery 100 when the internal pressure of the battery 100 exceeds a predetermined value.
• the safety valve 105 is also called a split valve.
• the safety valve 105 is provided, for example, in the lid 102.
• the holding unit 200 holds a plurality of batteries 100, as shown in Figures 1 to 3, 19 and 20. As shown in Figures 3, 19 and 20, the holding unit 200 includes a first end spacer 201, a cell spacer 202 and a second end spacer 203. The holding unit 200 also includes a first end block 211, a second end block 212, 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 will be described below.
• the first end spacer 201 is provided between the first end block 211 and the battery 100 as shown in FIG. 20.
• the first end spacer 201 contacts the first battery 100 located at one end of the stacked 20 batteries 100. This battery 100 corresponds to the battery 100 located at the left end in FIG. 3.
• the first end spacer 201 insulates the first end block 211 and the battery 100.
• the first end spacer 201 covers each side surface of the first end block 211 and the battery 100 along the width direction Y.
• the first end spacer 201 covers a part of the side surface 100b of the battery 100 along the stacking direction X.
• the thickness of the first end spacer 201 along the stacking direction X is sufficiently thinner than the thickness of the battery 100 along the stacking direction X.
• the first end spacer 201 is formed of an insulating material.
• the cell spacer 202 is provided between adjacent batteries 100.
• the cell spacer 202 holds and insulates the adjacent batteries 100.
• the cell spacer 202 covers the main surfaces 100c of the adjacent batteries 100 along the width direction Y, and a portion of the side surfaces 100b of the adjacent batteries 100 along the stacking direction X.
• the thickness of the cell spacer 202 along the stacking direction X is sufficiently thinner than the thickness of the batteries 100 along the stacking direction X.
• the cell spacer 202 is made of an insulating material.
• the second end spacer 203 is provided between the battery 100 and the second end block 212 as shown in FIG. 20.
• the second end spacer 203 contacts the twentieth battery 100 located at the other end of the stack of twenty batteries 100.
• This battery 100 corresponds to the battery 100 located at the right end in FIG. 3.
• the second end spacer 203 insulates the battery 100 from the second end block 212.
• the second end spacer 203 covers the side surfaces of the second end block 212 and the battery 100 along the width direction Y.
• the second end spacer 203 covers a part of the side surface 100b of the battery 100 along the stacking direction X.
• the thickness of the second end spacer 203 along the stacking direction X is sufficiently thinner than the thickness of the battery 100 along the stacking direction X.
• the second end spacer 203 is formed of an insulating material.
• the first end block 211 is stacked with the first battery 100 located at one end of the stacked 20 batteries 100 via the first end spacer 201.
• the first end block 211 extends along the width direction Y intersecting 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 supports the battery 100.
• the first end block 211 is formed in a rectangular shape extending in the width direction Y.
• Fastening bolts 241 are screwed into a plurality of screw holes 211m formed on the side of the first end block 211 along the width direction Y shown in FIG. 19.
• the first end block 211 is fixed to the first side plate 231 by the fastening bolts 241 as shown in FIG. 2.
• the first end block 211 is fixed to the second side plate 232 by the fastening bolts 241.
• the first end block 211 has an insertion hole 211n for inserting a bolt or the like for fixing the battery pack 1.
• the first end block 211 is made of, for example, metal or resin.
• the second end block 212 is stacked with the twentieth battery 100 located at the other end of the stacked 20 batteries 100 via the second end spacer 203.
• the second end block 212 extends along the width direction Y of the battery 100.
• the second end block 212 is adjacent to the battery 100 located at the end along the stacking direction X and supports the battery 100.
• the second end block 212 is formed in a rectangular shape extending in the width direction Y.
• the second end block 212 has a plurality of screw holes formed on the side surface along the width direction Y shown in FIG. 19, into which fastening bolts 241 are screwed.
• the second end block 212 is fixed to the first side plate 231 by the fastening bolts 241 as shown in FIG. 2.
• the second end block 212 is fixed to the second side plate 232 by the fastening bolts 241.
• the second end block 212 has an insertion hole 212n for inserting a bolt or the like for fixing the battery pack 1.
• the second end block 212 is made of, for example, metal or resin.
• the insulating member 221 is inserted into the first end block 211.
• the insulating member 221 is also inserted into the second end block 212.
• the insulating member 221 is formed, for example, in a rectangular parallelepiped shape.
• the insulating member 221 is formed from an insulating material.
• 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 the surface facing the first end spacer 201 to accommodate 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 203, or by being molded separately from the second end spacer 203 and then joined to the second end spacer 203. In such a case, the second end block 212 has a recess on the surface facing the second end spacer 203 to accommodate the insulating member 221 along the stacking direction X.
• the insert nut 222 is embedded in a recess formed in the upper surface of the insulating member 221.
• the insert nut 222 is anchored to a fastening bolt via a bus bar that is electrically connected to an external control device, for example.
• the first side plate 231 is arranged at one end of the stacked batteries 100 in the width direction Y along the stacking direction X of the stacked batteries 100, as shown in FIG. 2.
• the first side plate 231 holds the batteries 100 along the stacking direction X.
• the first side plate 231 has both ends extending along the stacking direction X bent toward the width direction Y.
• the first side plate 231 has fastening bolts 241 inserted into a plurality of insertion holes 231m formed on the side surface along the width direction Y.
• the first side plate 231 is fixed to the first end block 211 and the second end block 212 by the fastening bolts 241.
• the second side plate 232 is arranged at the other end of the multiple batteries 100 in the width direction Y along the stacking direction X of the stacked multiple batteries 100, as shown in FIG. 2.
• the second side plate 232 holds the multiple batteries 100 along the stacking direction X.
• the second side plate 232 has both ends extending along the stacking direction X bent toward the width direction Y.
• the second side plate 232 has multiple insertion holes 232m formed on its side along the width direction Y into which fastening bolts 241 are inserted.
• the second side plate 232 is fixed to the first end block 211 and the second end block 212 by the fastening bolts 241.
• the fastening bolts 241 fasten the first side plate 231 to the first end block 211, and the first side plate 231 to the second end block 212. As shown in FIG. 3, the fastening bolts 241 fasten the second side plate 232 to the first end block 211, and the second side plate 232 to the second end block 212.
• busbar unit 300 (Configuration of busbar unit 300)
• the busbar unit 300 shown in Figures 1 to 18 and 21 electrically connects a plurality of batteries 100.
• the busbar unit 300 includes a first end bus bar 301, a plurality of inter-cell bus bars 302, a second end bus bar 303, a busbar holder 311 (holding member), and a busbar cover 312 (covering member).
• the components included in the busbar unit 300 will be described below.
• the first end bus bar 301 is a bus bar.
• the first end bus bar 301 is connected to the positive terminal 103 of one battery 100 and is connected to an electrical device that is electrically connected to an external control device.
• the electrical device is, for example, a bus bar provided in an electric vehicle.
• the first end bus bar 301 is joined to the positive terminal 103 of the battery 100 that is closest to the first end block 211 among the 20 stacked batteries 100.
• the first end bus bar 301 includes a plate-shaped first joint portion 301a, a plate-shaped second joint portion 301b, a curved connecting portion 301c, a protrusion portion 301d, and an insertion hole 301e.
• the first joint 301a of the first end bus bar 301 is joined to an electrical device (bus bar) that is electrically connected to an external control device.
• the second joint 301b is joined to the positive terminal 103 of the battery 100.
• the connecting portion 301c connects the first joint 301a and the second joint 301b.
• the protrusion 301d of the first end bus bar 301 is formed on the edge of the second joint 301b, as shown in FIG. 21.
• the protrusion 301d extends in a direction away from the battery 100.
• the direction away from the battery 100 corresponds to the direction away from the battery 100 in the height direction Z.
• the protrusion 301d is formed in a plate shape.
• the protrusion 301d is formed integrally with the second joint 301b.
• the insertion hole 301e of the first end bus bar 301 is formed in the first joint portion 301a.
• a fastening bolt is inserted into the insertion hole 301e.
• the first joint portion 301a and the electrical device (bus bar) that is electrically connected to the external control device are joined by the fastening bolt.
• the first end bus bar 301 is formed of, for example, aluminum.
• the first joint 301a is formed of copper
• the second joint 301b and the protrusion 301d are formed of aluminum.
• the protrusion 301d is connected to the terminal 401 of the voltage detection unit 400.
• the first end bus bar 301 is formed of, for example, aluminum.
• the first end bus bar 301 is formed of a clad material, for example, the first joint 301a is formed of copper, and the second joint 301b is formed of aluminum.
• the first end bus bar 301 may be configured such that the first joint 301a, the second joint 301b, and the protrusion 301d are integrally formed of copper.
• the inter-cell bus bar 302 is a bus bar.
• the inter-cell bus bar 302 is connected to the positive terminal 103 of one battery 100 and the negative terminal 104 of another battery 100.
• the inter-cell bus bar 302 electrically connects the one battery 100 and the other battery 100 adjacent to each other along the stacking direction X.
• the inter-cell bus bar 302 is joined to the positive terminal 103 of one battery 100 adjacent to each other along the stacking direction X and the negative terminal 104 of the other battery 100 adjacent to each other along the stacking direction X.
• the inter-cell bus bar 302 includes a first joint portion 302a, a second joint portion 302b, a connecting portion 302c, and a protrusion portion 302d.
• the first joint 302a of the inter-cell bus bar 302 is joined to the negative terminal 104 of one of the adjacent batteries 100 as shown in FIG. 3.
• the first joint 302a is formed in a plate shape as shown in FIGS. 4, 8, and 9.
• the first joint 302a is formed from, for example, copper.
• the second joint 302b of the inter-cell bus bar 302 is joined to the positive terminal 103 of the other adjacent battery 100 as shown in Figures 4, 8 and 9.
• the second joint 302b is formed in a plate shape.
• the second joint 302b is formed from, for example, aluminum.
• the connecting portion 302c of the inter-cell bus bar 302 connects the first joint portion 302a and the second joint portion 302b.
• the connecting portion 302c is formed in a convex shape facing away from the battery 100.
• the connecting portion 302c is curved.
• the connecting portion 302c is formed in an inverted U-shape.
• the protrusion 302d of the inter-cell bus bar 302 is formed on the edge of the first joint 302a, as shown in Figures 4 and 9.
• the protrusion 302d extends in a direction away from the battery 100.
• the protrusion 302d is formed in a plate shape.
• the protrusion 302d extends along the width direction Y and the height direction Z.
• the protrusion 302d is formed integrally with the first joint 302a.
• the protrusion 302d is connected to the terminal 401 of the voltage detection unit 400.
• the protrusion 302d is formed of, for example, copper.
• the inter-cell bus bar 302 may be configured such that the first joint portion 302a, the second joint portion 302b, and the protrusion portion 302d are integrally formed from aluminum.
• the second end bus bar 303 is a bus bar.
• the second end bus bar 303 is connected to the negative terminal 104 of one battery 100 and is connected to an electrical device that is electrically connected to an external control device.
• the electrical device is, for example, a bus bar provided in an electric vehicle.
• the second end bus bar 303 is joined to the negative terminal 104 of the battery 100 that is closest to the second end block 212 among the 20 stacked batteries 100.
• the second end bus bar 303 includes a plate-shaped first joint portion 303a, a plate-shaped second joint portion 303b, a curved connecting portion 303c, a protrusion portion 303d, and an insertion hole 303e.
• the first joint 303a of the second end bus bar 303 is joined to the negative terminal 104 of the battery 100.
• the second joint 303b is joined to an electrical device (bus bar) that is electrically connected to an external control device.
• the protrusion 303d of the second end bus bar 303 is formed on the edge of the first joint 303a, as shown in FIG. 21.
• the protrusion 303d extends in a direction away from the battery 100.
• the protrusion 303d is formed in a plate shape.
• the protrusion 303d is formed integrally with the first joint 303a.
• the protrusion 303d is connected to the terminal 401 of the voltage detection unit 400.
• the connecting portion 303c of the second end bus bar 303 connects the first joint portion 303a and the second joint portion 303b.
• the insertion hole 303e is formed in the second joint portion 303b.
• a fastening bolt is inserted into the insertion hole 303e.
• the second joint portion 303b and an electrical device (bus bar) that is electrically connected to an external control device are joined by the fastening bolt.
• the second end bus bar 303 is formed, for example, from copper. That is, the first joint 303a, the second joint 303b, and the protrusion 303d of the second end bus bar 303 are integrally formed from copper. If the negative electrode terminal 104 of the battery 100 is configured to be converted from copper to aluminum, the second end bus bar 303 may be configured to have the first joint 303a, the second joint 303b, and the protrusion 303d integrally formed from aluminum.
• the busbar holder 311 is a holding member that holds the first end bus bar 301, the inter-cell bus bars 302, and the second end bus bar 303.
• the busbar holder 311 has insulating properties.
• the busbar holder 311 is formed of, for example, resin.
• the busbar holder 311 integrally holds the first end bus bar 301, the multiple inter-cell bus bars 302, and the second end bus bar 303.
• the busbar holder 311 also covers and insulates the stacked multiple batteries 100.
• the busbar holder 311 includes a base 311M and a protrusion 311N.
• the base 311M is located between the battery 100 and the inter-cell bus bar 302 and extends along the multiple batteries 100.
• the base 311M is located between the top surface 100a of the battery 100 and the inter-cell bus bar 302.
• the base 311M extends along the stacking direction X and the width direction Y.
• the base 311M is formed in a plate shape.
• the base 311M includes an opening 311a, a holding portion 311b, and an insertion portion 311c.
• each opening 311a exposes the first joint or the second joint of the first end bus bar 301, the multiple inter-cell bus bars 302, and the second end bus bar 303 toward the battery 100 side.
• each holding portion 311b clamps and holds the ends of the first end bus bar 301, the multiple inter-cell bus bars 302, and the second end bus bar 303.
• Each holding portion 311b is formed on the edge of the opening 311a.
• multiple insertion portions 311c are formed on the base 311M.
• the electric wires 502 of the temperature measurement unit 500 are inserted into the insertion portions 311c.
• the convex portion 311N is connected to the base portion 311M.
• the convex portion 311N is formed in a plate shape.
• the convex portion 311N extends in a direction away from the battery 100.
• the convex portion 311N is formed integrally with the base portion 311M.
• the convex portion 311N includes a first wall portion 311d and a second wall portion 311e.
• the first wall portion 311d of the convex portion 311N is formed in a plate shape as shown in Figures 4 to 9.
• the first wall portion 311d extends in the direction away from the battery 100 (height direction Z) and in the width direction Y.
• the first wall portion 311d is adjacent to the first connection portion 400P of the harness 400A along the stacking direction X of the battery 100.
• the stacking direction X is a direction intersecting the height direction Z.
• the first wall portion 311d is formed in a pair on the base portion 311M via the first connection portion 400P of the harness 400A. In other words, the first connection portion 400P of the harness 400A is disposed between the pair of first wall portions 311d.
• the pair of first wall portions 311d does not interfere with the first connection portion 400P of the harness 400A along the direction away from the battery 100.
• the first wall portion 311d and the first connection portion 400P of the harness 400A are not aligned along the height direction Z. Therefore, if the position of the first connection portion 400P is shifted in the height direction Z, interference between the first connection portion 400P and the first wall portion 311d can be prevented or suppressed.
• the second wall 311e of the protrusion 311N is formed in a plate shape as shown in Figs. 4 to 9.
• the second wall 311e extends in the direction away from the battery 100 (height direction Z) and in the width direction Y.
• the second wall 311e is adjacent to the second connection portion 400Q of the harness 400A along the stacking direction X of the battery 100.
• the second wall 311e extends in a direction away from the battery 100 further than the second connection portion 400Q.
• the second wall 311e extends in a direction away from the battery 100 further than the first wall 311d.
• the protruding height of the second wall 311e is greater than the protruding height of the first wall 311d.
• the tip of the upper surface 311e1 of the second wall portion 311e of the convex portion 311N is the farthest from the battery 100 in the busbar holder 311.
• the second wall portion 311e includes a curved portion.
• the upper surface 311e1 of the second wall portion 311e is curved in a semicircular shape.
• the second wall portion 311e is formed to be continuous with the first wall portion 311d along the base portion 311M.
• the second wall portion 311e is formed in a pair on the base portion 311M via the second connection portion 400Q of the harness 400A. In other words, the second connection portion 400Q of the harness 400A is disposed between the pair of second wall portions 311e.
• the pair of second wall portions 311e does not interfere with the second connection portion 400Q of the harness 400A along the direction away from the battery 100.
• the second wall portion 311e and the second connection portion 400Q of the harness 400A are not aligned along the height direction Z. Therefore, if the second connection portion 400Q is misaligned in the height direction Z, interference between the second connection portion 400Q and the second wall portion 311e can be prevented or suppressed.
• the pair of protrusions 311N regulate the position of the harness 400A in the stacking direction X.
• the pair of protrusions 311N clamp the harness 400A from both sides in the stacking direction X.
• the pair of protrusions 311N is not limited to a configuration in which the harness 400A is clamped.
• a predetermined gap may be provided between the harness 400A and the protrusions 311N.
• the predetermined gap is, for example, equal to or smaller than the width of the harness 400A in the stacking direction X. This makes it possible to prevent or suppress misalignment in the stacking direction X of the first connection portion 400P and the second connection portion 400Q, which are the ends of the harness 400A.
• the pair of protrusions 311N can also be used for positioning when attaching the ends of the harness 400A to the bus bar.
• the busbar cover 312 is a covering member.
• the busbar cover 312 is formed in a plate shape. As shown in FIG. 1 , the busbar cover 312 faces the busbar holder 311 and covers the inter-cell busbar 302 and the like.
• the gap between the busbar cover 312 and the second wall portion 311e is shorter than the thickness of the electric wire 402 in the height direction Z.
• the busbar cover 312 is in contact with the second wall portion 311e. That is, the gap between the busbar cover 312 and the second wall portion 311e is 0 (zero).
• the gap between the busbar cover 312 and the second wall portion 311e may be larger than 0 (zero).
• the busbar cover 312 has insulating properties.
• the busbar cover 312 is formed of, for example, resin.
• the voltage detection unit 400 shown in Figures 2 to 18 and 21 detects the voltage of the battery 100 based on control by, for example, an external control device.
• the voltage detection unit 400 includes a harness 400A as shown in Figures 4 to 9 and 21.
• the harness 400A includes terminals 401 and electric wires 402. The components included in the voltage detection unit 400 will be described below.
• the terminal 401 corresponds to a cell voltage detection terminal.
• the terminal 401 is conductive.
• the terminal 401 is formed, for example, by a crimp terminal.
• the terminal 401 is joined to the protrusion 302d of the inter-cell bus bar 302.
• the terminal 401 includes a first connection region 401a, a second connection region 401b, and a third connection region 401c along the width direction Y.
• the first connection region 401a of the terminal 401 is connected to the inter-cell bus bar 302 by being crimped together with the protrusion 302d of the inter-cell bus bar 302.
• the second connection region 401b is connected to the electric wire 402 by being crimped together with the conductor 402a of the electric wire 402.
• the third connection region 401c is connected to the electric wire 402 by being crimped together with the coating 402b of the electric wire 402.
• the end 401d of the third connection region 401c is the boundary between the part of the electric wire 402 joined to the terminal 401 and the part of the electric wire 402 not joined to the terminal 401.
• the distance from the end 401d to the end of the second wall portion 311e (the end of the protrusion 311N) is, for example, equal to or greater than the diameter of the electric wire 402.
• the terminal 401 is joined to the protrusion 301d of the first end bus bar 301. As shown in FIG. 21, the terminal 401 is joined to the protrusion 303d of the second end bus bar 303.
• the electric wire 402 is crimped and connected to the terminal 401.
• the electric wire 402 is formed to be deformable.
• the electric wire 402 provides electrical continuity between the terminal 401 and an external control device.
• the electric wire 402 includes a conductor 402a and a coating 402b that covers the outer circumference of the conductor 402a.
• the tip of the conductor 402a is exposed from the coating 402b.
• the tip of the conductor 402a is crimped and connected to the second connection region 401b of the terminal 401.
• the coating 402b is crimped and connected to the third connection region 401c of the terminal 401.
• the harness 400A has a first connection part 400P and a second connection part 400Q.
• the second connection portion 400Q is a portion of the harness 400A where the terminal 401 and the electric wire 402 are connected. In addition to the portion where the terminal 401 and the electric wire 402 are connected, the second connection portion 400Q also includes a portion adjacent to the portion where the terminal 401 and the electric wire 402 are connected. As shown in Figure 7, the second connection portion 400Q includes a second connection region 401b, a third connection region 401c and an end portion 401d.
• the second connection part 400Q is connected to the first connection part 400P along the direction along the base part 311M.
• the direction along the base part 311M is, for example, the width direction Y.
• the electric wire 402 is connected to the terminal 401 by crimping.
• the second connection part 400Q and the electric wire 402 include a portion that extends along the direction along the base part 311M.
• the direction along the base part 311M is, for example, the width direction Y or the stacking direction X.
• the portion that extends along the direction along the base part 311M is a portion that extends parallel to the width direction Y or the stacking direction X.
• the portion that extends along the direction along the base part 311M is a portion that extends while inclining with respect to a plane parallel to the width direction Y or the stacking direction X.
• the temperature measurement unit 500 includes a temperature sensor 501 and an electric wire 502. The components included in the temperature measurement unit 500 will be described below.
• the temperature sensor 501 measures the temperature of the battery 100.
• the temperature sensor 501 is attached to the lids 102 of the battery 100 located at the seventh and fourteenth positions from the first end block 211 to the second end block 212.
• the electric wire 502 is attached to the temperature sensor 501.
• the electric wire 502 provides electrical continuity between the temperature sensor 501 and an external control device.
• Fig. 12 is a side view showing a main part of the battery pack according to the first modification of the embodiment.
• the busbar cover 322 has a protrusion 322a that protrudes toward the busbar holder 311.
• the busbar cover 322 is a covering member.
• the protrusion 322a has a top surface that contacts the upper surface 311e1 of the second wall portion 311e. In the embodiment, the top surface corresponds to the lower surface of the busbar holder 311.
• the protrusion 322a has a concave surface that is recessed toward the busbar holder 311 on the surface opposite the top surface. In the embodiment, the surface opposite the top surface corresponds to the upper surface of the busbar holder 311.
• the top surface of the protrusion 322a does not have to be in contact with the upper surface 311e1 of the second wall portion 311e. In this case, it is preferable that the gap between the top surface of the protrusion 322a and the upper surface 311e1 of the second wall portion 311e is shorter than the thickness of the electric wire 402.
• the protrusion 322a may be formed from a separate member that can be attached to the flat busbar cover.
• Fig. 13 is a perspective view showing a main part of a battery pack according to the second modification of the embodiment.
• the busbar holder 611 (holding member) includes a base 311M and a protruding portion 611N.
• the protruding portion 611N includes a first wall portion 311d and a second wall portion 611e.
• the upper surface 611e1 of the second wall portion 611e is inclined relative to the upper surface 311d1 of the first wall portion 311d.
• the upper surface 611e1 of the second wall portion 611e is inclined relative to the base portion 311M.
• the upper surface 611e1 is inclined linearly so as to become higher in the height direction Z from the end side of the width direction Y of the battery 100 toward the center.
• the end side of the width direction Y of the battery 100 is the portion where the positive electrode terminal 103 and the negative electrode terminal 104 shown in FIG. 20 are located.
• the center of the width direction Y of the battery 100 is the portion where, for example, the safety valve 105 shown in FIG. 20 is located.
• the upper surface 611e1 becomes higher in the height direction Z from the position where it contacts the first wall portion 311d along the direction away from the first wall portion 311d in the width direction Y.
• the position where it contacts the first wall portion 311d is the boundary between the first wall portion 311d and the second wall portion 311e.
• the upper surface 611e1 is linearly inclined.
• the upper surface 611e1 may be curved while being inclined.
• the upper surface 611e1 may be curved so as to bulge in a convex shape in a direction away from the battery 100, or may be curved so as to sink in a concave shape in a direction approaching the battery 100.
• the upper surface 611e1 may also be partially inclined.
• Fig. 14 is a perspective view showing a main part of a battery pack according to the third modification of the embodiment.
• the busbar holder 711 (holding member) includes a base 311M and a protruding portion 711N.
• the protruding portion 711N includes a first wall portion 311d and a second wall portion 711e.
• the upper surface 711e1 of the second wall portion 711e is inclined relative to the upper surface 311d1 of the first wall portion 311d.
• the upper surface 711e1 of the second wall portion 711e is inclined relative to the base portion 311M.
• the upper surface 711e1 is inclined linearly so as to become higher in the height direction Z from the center of the width direction Y of the battery 100 toward the end side.
• the center of the width direction Y of the battery 100 is, for example, the portion where the safety valve 105 shown in FIG. 20 is located.
• the end side of the width direction Y of the battery 100 is the portion where the positive electrode terminal 103 and the negative electrode terminal 104 shown in FIG. 20 are located.
• the upper surface 711e1 becomes lower in the height direction Z from the position where it contacts the first wall portion 311d along the direction away from the first wall portion 311d in the width direction Y.
• the position where it contacts the first wall portion 311d is the boundary between the first wall portion 311d and the second wall portion 311e.
• the upper surface 711e1 is linearly inclined.
• the upper surface 711e1 may be curved while being inclined.
• the upper surface 711e1 may be curved so as to bulge in a convex shape in a direction away from the battery 100, or may be curved so as to sink in a concave shape in a direction approaching the battery 100.
• the upper surface 711e1 may also be partially inclined.
• Fig. 15 is a perspective view showing a main part of a battery pack according to the fourth modification of the embodiment.
• the busbar holder 811 (holding member) includes a base 311M and a protruding portion 811N.
• the protruding portion 811N includes a first wall portion 311d and a second wall portion 811e.
• the upper surface 811e1 of the second wall portion 811e is higher in the height direction Z than the upper surface 311d1 of the first wall portion 311d.
• the upper surface 811e1 is formed parallel to the upper surface 311d1 of the first wall portion 311d.
• the upper surface 811e1 is formed parallel to the base portion 311M.
• Fig. 16 is a perspective view showing a main part of a battery pack according to the fifth modified example of the embodiment.
• the busbar holder 911 (holding member) includes a base 311M and a protruding portion 911N.
• the protruding portion 911N includes a pair of first walls 311d and 911d, and a pair of second walls 311e.
• the pair of first wall portions 311d and first wall portions 911d are formed on the base portion 311M via the second connection portion 400Q of the harness 400A.
• the first wall portions 311d and first wall portions 911d are arranged parallel to each other along the width direction Y while being spaced apart from each other.
• the first wall portion 311d faces the inter-cell bus bar 302 along the width direction Y.
• the first wall portion 911d does not face the inter-cell bus bar 302 along the width direction Y.
• the first wall portion 911d faces the entire area of the first connection portion 400P along the stacking direction X.
• the first wall portion 911d faces a partial area of the inter-cell bus bar 302 along the stacking direction X.
• the first wall portion 911d has a longer length along the width direction Y than the first wall portion 311d.
• the upper surface 911d1 of the first wall portion 911d has a longer length along the width direction Y than the upper surface 311d1 of the first wall portion 311d.
• Fig. 17 is a perspective view showing a main part of a battery pack according to the sixth modified example of the embodiment.
• the busbar holder 1011 (holding member) includes a base 311M and a protrusion 1011N.
• the first wall 311d and the second wall 311e of the protrusion 1011N are formed on the base 311M so as to be adjacent to one side of the harness 400A.
• a pair of protrusions 311N are provided for each bus bar.
• the electric wire 402 includes a portion that extends along the protrusion 1011N and a portion that bends from that portion toward the protrusion 1011N and extends along the stacking direction X.
• the electric wire 402 is taken out to the outside of the battery pack 1 from the insertion opening of the bus bar cover 312. Since the protrusion 1011N is configured to support the electric wire 402 in the stacking direction X, the load applied to the connection between the terminal 401 and the electric wire 402 can be reduced.
• Fig. 18 is a perspective view showing a main part of a battery pack according to the seventh modification of the embodiment.
• the busbar holder 1111 (holding member) includes a base 311M and a protrusion 1111N.
• the first wall 311d and second wall 311e of the protrusion 1111N are formed on the base 311M so as to be adjacent to one side of every other harness 400A, i.e., half of the harnesses 400A, among the harnesses 400A adjacent along the stacking direction X.
• the harnesses 400A arranged along the stacking direction X alternate between those with adjacent protrusions 1111N and those with not adjacent protrusions 1111N.
• the protrusions 1111N are thinned out for the harnesses 400A arranged along the stacking direction X.
• the protrusion 1111N may be formed on the base 311M so as to be adjacent to one side of the harnesses 400A that are spaced apart by two or more of the harnesses 400A that are adjacent to each other in the stacking direction X.
• the possibility of the harness 400A being damaged increases the closer it is to the insertion opening of the bus bar cover 312. This is because the closer it is to the insertion opening, the more the wires 402 gather and pile up in the height direction Z. For this reason, it is preferable to provide a protrusion 1111N at least at the connection between the bus bar closest to the insertion opening of the bus bar cover 312 and the harness 400A.
• the inter-cell bus bar 302 will be used as an example for the explanation.
• the first wall portion 311d and the second wall portion 311e are adjacent to the harness 400A.
• the first wall portion 311d and the second wall portion 311e may be adjacent to any one or more of the multiple harnesses 400A.
• the second wall portion 311e extends in a direction away from the battery 100 further than the second connection portion 400Q.
• the second wall portion 311e may include a portion that extends in a direction away from the battery 100 further than the second connection portion 400Q.
• the second wall portion 311e can come into contact with any member before the harness 400A interferes with the member. That is, with this configuration, it is possible to prevent or suppress the harness 400A from interfering with any member. With this configuration, it is possible to prevent or suppress the harness 400A from interfering with any member, particularly along the height direction Z.
• the arbitrary member may be a member of the battery pack 1, or a member different from the battery pack 1.
• the member different from the battery pack 1 is, for example, a member on the vehicle side on which the battery pack 1 is provided, or a tool or manufacturing equipment used when providing the battery pack 1 on the vehicle side.
• the manufacturing equipment is, for example, a transport device for the battery pack 1.
• the battery pack 1 can adequately protect the harness 400A connected to the inter-cell bus bar 302.
• the second wall portion 311e faces the end portion 401d of the terminal 401 along a direction intersecting the height direction Z, as shown in Figs. 6 and 7.
• the end portion 401d is the boundary between the portion of the electric wire 402 joined to the terminal 401 and the portion of the electric wire 402 not joined to the terminal 401.
• the presence of the second wall portion 311e makes it possible to prevent or suppress the electric wire 402 from breaking due to interference between the end portion 401d or the peripheral portion of the end portion 401d and any member.
• the battery pack 1 further includes a busbar cover 312 (covering member) that faces the busbar holder 311 (holding member) and covers the inter-cell busbar 302.
• the second wall portion 311e can be brought into contact with the bus bar cover 312 before the harness 400A interferes with the bus bar cover 312. That is, with this configuration, it is possible to prevent or suppress interference between the harness 400A and the bus bar cover 312. With this configuration, it is possible to prevent or suppress interference between the harness 400A and the bus bar cover 312, particularly along the height direction Z.
• the bus bar cover 312 faces the bus bar holder 311 along the height direction Z. Therefore, the battery pack 1 can adequately protect the harness 400A connected to the inter-cell bus bar 302.
• the length of the battery pack 1 in the height direction Z can be relatively short. Because the size of the battery pack 1 can be reduced, the workability of mounting the battery pack 1 to a vehicle or the like is improved. Furthermore, because the space required to place the battery pack 1 in a vehicle or the like is reduced, the living space of the vehicle or the like can be made larger.
• the harness 400A can be moved downward along the upper surface 311e1 of the second wall portion 311e, and the harness 300A can be prevented from being caught between the busbar cover 312 and the second wall portion 311e. This allows the second wall portion 311e to come into contact with the busbar cover 312 before the harness 400A interferes with the busbar cover 312.
• the battery pack 1 can adequately protect the harness 400A connected to the inter-cell busbar 302.
• the work of wiring the harness 400A in the busbar holder 311 and the work of attaching the busbar cover 312 to the busbar holder 311 in which the harness 400A is wired can be easily performed because damage to the harness 400A can be prevented or suppressed.
• the corner of the metal fittings is, for example, the end of the second connection region 401b or the corner of the terminal 401 between the first connection region 401a and the second connection region 401b.
• the busbar cover 312 is in contact with the second wall portion 311e.
• the length of the battery pack 1 in the height direction Z can be made relatively short. Because the size of the battery pack 1 can be reduced, the workability of mounting the battery pack 1 to a vehicle or the like is improved. Furthermore, because the space required to place the battery pack 1 in a vehicle or the like is reduced, the living space of the vehicle or the like can be made larger.
• the harness 400A can be moved downward along the upper surface 311e1 of the second wall portion 311e, and the harness 300A can be prevented from being caught between the busbar cover 312 and the second wall portion 311e. This allows the second wall portion 311e to come into contact with the busbar cover 312 before the harness 400A interferes with the busbar cover 312.
• the battery pack 1 can adequately protect the harness 400A connected to the inter-cell busbar 302.
• the work of wiring the harness 400A in the busbar holder 311 and the work of attaching the busbar cover 312 to the busbar holder 311 in which the harness 400A is wired can be easily performed because damage to the harness 400A can be prevented or suppressed.
• the second wall portion 311e includes a portion that extends in a direction away from the battery 100 than the first wall portion 311d.
• the second wall portion 311e can come into contact with any member before the first wall portion 311d interferes with the member. Therefore, with this configuration, the first connection portion 400P protected by the first wall portion 311d can be sufficiently protected.
• the second connection portion 400Q and the electric wire 402 include a portion that extends in a direction along the base portion 311M.
• the second connection part 400Q and the electric wire 402 when the second connection part 400Q and the electric wire 402 come relatively close to an arbitrary member along a direction (height direction Z) that intersects with the part extending along the direction along the base part 311M, the second wall part 311e can come into contact with the arbitrary member. In other words, with this configuration, the second connection part 400Q and the electric wire 402 can be protected by the second wall part 311e.
• the electric wire 402 is formed to be deformable.
• the second wall portion 311e can prevent or suppress interference between the electric wire 402 and any component.
• the electric wire 402 is crimped and connected to the terminal 401 at the second connection portion 400Q.
• the second wall portion 311e can prevent or suppress interference between the electric wire 402, which is crimped and connected to the terminal 401, and any other component.
• the second wall portion 311e includes the portion of the busbar holder 311 that is farthest from the battery 100.
• This configuration makes it easier for the second wall portion 311e to come into contact with any member in the busbar holder 311 before the harness 400A interferes with the member. In other words, this configuration makes it possible to prevent or suppress the harness 400A protected by the second wall portion 311e from interfering with any member.
• the second wall portion 311e is formed in pair on the base portion 311M via the second connection portion 400Q of the harness 400A.
• the second connection portion 400Q of the harness 400A can be sandwiched between the pair of second walls 311e.
• the configuration of sandwiching the second connection portion 400Q between the pair of second walls 311e is a configuration in which the pair of second walls 311e holds the second connection portion 400Q, and is not a configuration in which the pair of second walls 311e fixes the second connection portion 400Q. That is, with this configuration, the pair of second walls 311e can protect the second connection portion 400Q of the harness 400A from both sides. Furthermore, the pair of second walls 311e can relatively increase the rigidity. Therefore, the pair of second walls 311e can easily maintain the outer shape when in contact with any member. That is, the second connection portion 400Q of the harness 400A can be protected by the second walls 311e.
• the harness 400A By clamping the harness 400A with the pair of second walls 311e, it is possible to prevent the position of the harness 400A from shifting due to vibrations of a vehicle or the like. As a result, it is possible to prevent damage to the other electric wires 402 caused by contact between the metal fittings connecting a specific electric wire 402 and a specific bus bar and the other electric wires 402.
• the pair of second walls 311e and the harness 400A do not have to be in contact with each other.
• the length of the gap between the pair of second walls 311e is 5 to 10 times the diameter of the electric wire 402 or less.
• the length of the gap between the pair of second walls 311e corresponds to the length in the stacking direction X. From the viewpoint of positioning the electric wire 402, it is preferable that the length of the gap between the pair of second walls 311e is 2 times the diameter of the electric wire 402 or less.
• the second wall portion 311e is separated from the second connection portion 400Q of the harness 400A in the direction away from the battery 100.
• the second wall portion 311e includes a curved portion or a portion that is inclined relative to the base portion 311M.
• the second wall portion 311e is formed to be continuous with the first wall portion 311d along the base portion 311M.
• the second wall portion 311e is connected to the first wall portion 311d, which increases its rigidity. Therefore, the second wall portion 311e can easily maintain its outer shape when it comes into contact with any member. In other words, the second wall portion 311e can protect the second connection portion 400Q of the harness 400A.
• the inter-cell bus bar 302 includes a protrusion 302d that extends in a direction away from the battery 100.
• the protrusion 302d is connected to the terminal 401.
• This configuration allows easy connection of the inter-cell bus bar 302 and the terminal 401.
• the battery pack 1 has a plurality of electric wires 402.
• the plurality of electric wires 402 overlap each other in a direction away from the battery 100.
• the direction away from the battery 100 is the height direction Z.
• the upper electric wire 402 When the multiple electric wires 402 overlap in the height direction Z, the upper electric wire 402 is positioned closer to the bus bar cover 312.
• the tip of the second wall portion 311e is positioned closer to the bus bar cover 312 than the uppermost electric wire 402.
• the tip of the second wall portion 311e is the upper end along the height direction. Therefore, the second wall portion 311e can be brought into contact with any member before the multiple electric wires 402 arranged in an overlapping state in the height direction Z interfere with any member. In other words, with this configuration, it is possible to prevent or suppress interference between the multiple electric wires 402 and any member.
• the busbar cover 312 is formed with insertion openings through which the multiple electric wires 402 are inserted.
• the number of insertion openings is less than the number of electric wires 402.
• the busbar cover 312 is provided with, for example, two insertion openings. Ten or eleven or more electric wires 402 bundled together are inserted into one insertion opening.
• the multiple electric wires 402 are taken out of the busbar cover 312 in a bundled state. This makes it possible to prevent the electric wires 402 connecting the battery pack 1 and an external control device from being arranged in a messy manner.
• the battery pack 1 may have an electric wire 403 other than the specific electric wire 402 connected to the inter-cell bus bar 302.
• the other electric wire 403 is an electric wire connected to a bus bar other than the specific inter-cell bus bar 302.
• the configuration of the electric wire 403 is similar to the configuration of the electric wire 402.
• the other electric wire 403 is located on the inter-cell bus bar 302 side of the tip of the upper surface 311e1 of the second wall portion 311e that holds the electric wire 402.
• the electric wire 403 rides up on the upper surface 311d1 of the first wall portion 311d.
• the tip of the upper surface 311e1 of the second wall portion 311e is located on the bus bar cover 312 side of the electric wire 403.
• the tip of the second wall portion 311e is the upper end along the height direction. Therefore, the second wall portion 311e and the busbar cover 312 can come into contact with each other before the electric wire 403 riding on the upper side of the first wall portion 311d interferes with the busbar cover 312. In other words, with this configuration, it is possible to prevent or suppress interference between the electric wire 403 and the busbar cover 312.
• the electric wire 402 has a sufficient length in consideration of ease of installation. Therefore, the electric wire 402 may be arranged in a meandering manner rather than extending in a straight line. In this case, as shown in FIG. 11, a part of the electric wire 403 may be located closer to the inter-cell bus bar 302 than the second wall 311e. If the first wall 311d did not exist, the electric wire 403 may come into contact with metal fittings connecting the electric wire 402 to the inter-cell bus bar 302, for example, and be damaged. In contrast, in this embodiment, the first wall 311d connected to the second wall 311e extends along the width direction Y. Therefore, the electric wire 403 can be prevented from coming into contact with metal fittings connecting the electric wire 402 to the inter-cell bus bar 302, for example. As a result, damage to the electric wire 403 is prevented.
• the electric wire 403 is located closer to the inter-cell bus bar 302 than the tip of the upper surface 311e1 of the second wall portion 311e that holds the electric wire 402. On the other hand, even if another electric wire 403 is located farther from the inter-cell bus bar 302 than the tip of the upper surface 311e1 of the second wall portion 311e that holds the electric wire 402, interference between the electric wire 403 and the bus bar cover 312 can be prevented or suppressed.
• the battery pack of the present invention is not limited to the configuration of the battery pack described in the embodiment, and can be appropriately configured based on the contents described in the claims.
• the number of batteries 100 included in the battery pack 1 is not limited to 20.
• the number of batteries 100 may be, for example, 2 to 19 or 21 or more.
• the batteries 100 are not limited to lithium ion batteries.
• nickel-metal hydride batteries and lead batteries can be used as the batteries 100.
• the batteries 100 are not limited to secondary batteries.
• primary batteries can be used as the batteries 100.
• 1 battery pack 100 batteries, 101 container, 102 lid, 103 positive electrode terminal (electrode terminal), 104 negative electrode terminal (electrode terminal), 105 safety valve, 200 holding units, 201 first end spacer, 202 cell spacer, 203 second end spacer, 211 first end block, 212 second end block, 221 insulating member, 222 Insert nut, 231 first side plate, 232 second side plate, 241 Fastening bolt, 300 busbar unit, 301 first end bus bar (bus bar), 301a first joint, 301b second joint, 301c connecting portion, 301d protrusion, 301e insertion hole, 302 Inter-cell bus bar (bus bar), 302a first joint, 302b second joint, 302c connecting portion, 302d protrusion, 303 second end bus bar (bus bar), 303a first joint, 303b second joint, 303c connecting portion, 303d protrusion, 303e insertion hole, 311 busbar holder (holding member), 311M base, 311N con

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• Chemical Kinetics & Catalysis (AREA)
• Electrochemistry (AREA)
• General Chemical & Material Sciences (AREA)
• Connection Of Batteries Or Terminals (AREA)
• Battery Mounting, Suspending (AREA)

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Citations (3)

• 2024
  • 2024-06-18 WO PCT/JP2024/022057 patent/WO2025032975A1/ja active Pending
  • 2024-06-18 JP JP2025539166A patent/JPWO2025032975A1/ja active Pending
  • 2024-06-18 CN CN202480024669.6A patent/CN120958648A/zh active Pending

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