BATTERY HOUSING BODY AND BATTERY PACK

Abstract

A battery case body according to an embodiment comprises a case capable of accommodating a plurality of battery cells, wherein a pair of cell terminals faces a mounting surface, and a first connection bus bar having a first extension portion extending in an extension direction along the mounting surface, a first spring continuously connected to the first extension portion at a first side in the extension direction of the first extension portion, and a second spring continuously connected to the first extension portion at a second side in the extension direction of the first extension portion, in which the plurality of battery cells comprises a first battery cell and a second battery cell,the first spring is connectable to a cell terminal on a first side in a separation direction of a pair of cell terminals of the first battery cell, and the second spring is connectable to a cell terminal on a first side in the separation direction of a pair of cell terminals of the second battery cell.

Description

BACKGROUND OF THE INVENTIONField of the InventionAn embodiment of the present invention relates to a battery case body and a battery pack.DESCRIPTION OF THE RELATED ARTIt is well known that a plurality of battery cells are used as a power source in a device. For example, Japanese Unexamined Patent Application, First Publication No. 2019-149227 discloses that a secondary battery module having a plurality of battery cells is used in an electric vehicle.SUMMARY OF THE INVENTIONIn the secondary battery module disclosed in Japanese Unexamined Patent Application, First Publication No. 2019-149227, cell terminals of a plurality of battery cells, the cell terminals being inserted into terminal insertion holes provided in a bus bar box, are connected by a bus bar. However, in the configuration of the secondary battery module disclosed in Japanese Unexamined Patent Application, First Publication No. 2019-149227, the number of parts for connecting the cell terminals of the plurality of battery cells and the bus bar may increase.An embodiment of the present invention provides a battery case body and a battery pack capable of reducing the number of parts.A battery case body according to an embodiment of the present invention includes a case having a mounting surface, the case being capable of accommodating a plurality of battery cells each having a pair of cell terminals separated from each other in a separating direction, the pair of cell terminals facing the mounting surface, and a first connection bus bar having a first extending portion extending in an extending direction along the mounting surface, a first spring continuously connected to the first extending portion on a first side in the extending direction of the first extending portion, and a second spring continuously connected to the first extending portion on a second side in the extending direction of the first extending portion, in which the plurality of battery cells includes a first battery cell and a second battery cell, the first spring is connectable to a cell terminal on a first side in the separating direction of the pair of cell terminals of the first battery cell, and the second spring is connectable to a cell terminal on a first side in the separating direction of the pair of cell terminals of the second battery cell.A battery case body according to an embodiment of the present invention includes a case having a mounting surface, the case being capable of accommodating a plurality of battery cells each having a pair of cell terminals, at least one cell terminal of the pair of cell terminals facing the mounting surface, and a first connection bus bar having a first extending portion extending in an extending direction along the mounting surface, a first spring continuously connected to the first extending portion at a first side in the extending direction of the first extending portion, and a second spring continuously connected to the first extending portion at a second side in the extending direction of the first extending portion, in which the plurality of battery cells includes a first battery cell and a second battery cell, the first spring is connectable to the one cell terminal of the pair of cell terminals of the first battery cell, and the second spring is connectable to the one cell terminal of the pair of cell terminals of the second battery cell.A battery case body and a battery pack according to an embodiment of the present invention can reduce the number of parts.BRIEF DESCRIPTION OF THE DRAWINGSFIG. 1 is a front view of a battery pack according to an embodiment. FIG. 2 is a plan view of the battery pack according to the embodiment. FIG. 3 is a cross-sectional view taken along line III-III of FIG. 2. FIG. 4 is a plan view of a battery case body according to the embodiment. FIG. 5 is a cross-sectional view taken along line V-V of FIG. 2. FIG. 6 is a perspective view of each connection bus bar according to the embodiment. FIG. 7 is a cross-sectional view taken along line VII-VII of FIG. 2. FIG. 8 is a system diagram of a wiring module according to the embodiment. FIG. 9 is a cross-sectional view of the battery pack before a cover is attached, taken along line V-V of FIG. 2, according to the embodiment. FIG. 10 is a cross-sectional view of a battery pack according to a first modification of the embodiment taken along line III-III of FIG. 2. FIG. 11 is a system diagram of a wiring module according to a second modification of the embodiment.DETAILED DESCRIPTION OF THE INVENTION<>Hereinafter, a battery case body and a battery pack of the present embodiment will be described with reference to the drawings.(Configuration of Battery Pack)As illustrated in FIGS. 1 to 3, a battery pack 9 of the present embodiment includes a battery case body 1, a plurality of battery cells 7, and a cover 8. The battery pack 9 is unified by closing the battery case body 1 in which the plurality of battery cells 7 are accommodated with the cover 8.(Configuration of Battery Cell)The plurality of battery cells 7 are accommodated in the battery case body 1. The plurality of battery cells 7 are attachable to and detachable from the battery case body 1. The plurality of battery cells 7 are arranged in one direction. Each battery cell 7 has a rectangular parallelepiped shape. Each battery cell 7 includes an electrode surface 7 e.Hereinafter, a direction in which the plurality of battery cells 7 are arranged will be referred to as an X direction. A direction in which the plurality of battery cells 7 can be attached to and detached from the battery case body 1 is defined as a Z direction. A direction intersecting a ZX direction is defined as a Y direction. The X direction is also referred to as an extension direction DE. The Y direction is also referred to as a separation direction DS. The Z direction is also referred to as an attachment / detachment direction DR. One direction in the X direction is defined as a +X direction, and the other direction in the X direction is defined as a -X direction. One direction in the Y direction is defined as a +Y direction, and the other direction in the Y direction is defined as a -Y direction. One direction in the Z direction is defined as a +Z direction, and the other direction in the Z direction is defined as a -Z direction.For example, the X direction, the Y direction, and the Z direction may be directions orthogonal to each other. For example, the electrode surface 7 emay be a surface along an XY plane. For example, an insertion direction of the plurality of battery cells 7 into the battery case body 1 may be the -Z direction. For example, a direction in which the electrode surface 7 efaces may be the -Z direction. For example, the -Z direction may be a downward direction.The plurality of battery cells 7 includes a first battery cell 71, a second battery cell 72, a third battery cell 73, a fourth battery cell 74, and a fifth battery cell 75. the first battery cell 71, the second battery cell 72, the third battery cell 73, the fourth battery cell 74, and the fifth battery cell 75 are arranged side by side in this order in the +X direction.Each battery cell 7 includes a pair of cell terminals 7T. The pair of cell terminals 7T are separated from each other in the separating direction DS. Each cell terminal 7T protrudes from the electrode surface 7 ein the -Z direction.One of the pair of cell terminals 7T is a positive electrode and the other is a negative electrode. For example, the plurality of battery cells 7 may be arranged in such a manner that the positive electrode and the negative electrode of the battery cells 7 adjacent to each other in the X direction are opposed to each other.Specifically, regarding the first battery cell 71, the third battery cell 73, and the fifth battery cell 75 among the plurality of battery cells 7, each pair of cell terminals 7T may include the positive electrode cell terminal 7T on a -Y direction side and the negative electrode cell terminal 7T on a +Y direction side.In contrast, regarding the second battery cell 72 and the fourth battery cell 74 of the plurality of battery cells 7, each pair of cell terminals 7T may include the negative electrode cell terminal 7T on the -Y direction side and the positive electrode cell terminal 7T on the +Y direction side.(Configuration of Battery Case Body)The battery case body 1 is a device for collectively receiving the plurality of battery cells 7 and externally outputting a voltage from the plurality of battery cells 7. the battery case body 1 includes a housing 2, a plurality of bus bars 3, and a wiring module 4.(Configuration of Housing)The housing 2 can accommodate the plurality of battery cells 7 with the pair of cell terminals 7T facing a mounting surface 2 a. The housing 2 has a rectangular parallelepiped box shape opened on a +Z direction side. The housing 2 is made of an insulator material such as plastic or a metal material such as aluminum.The housing 2 includes an opening 2 pin the +Z direction side. The housing 2 includes, on an inner side thereof, the mounting surface 2 afacing the +Z direction, a pair of first circumferential side surfaces 2 bfacing each other in the X direction, and a pair of second circumferential side surfaces 2 cfacing each other in the Y direction. The housing 2 includes a storage space 2 vfor storing the plurality of battery cells 7 therein. The accommodation space 2 vis defined by the mounting surface 2 a, the pair of first circumferential side surfaces 2 b, and the pair of second circumferential side surfaces 2 c. For example, each of the mounting surface 2 a, the pair of first circumferential side surfaces 2 b, and the pair of second circumferential side surfaces 2 cmay be a flat surface. For example, the housing 2 may include the mounting surface 2 aon an inner bottom.For example, the housing 2 may include a stopper 21 and a plurality of slits 22 therein.The stopper 21 is a structure for restricting movement of the battery cells 7 in the -Z direction by coming into contact with the electrode surface 7 eof the battery cell 7 accommodated in the case 2 from a -Z direction side. The stopper 21 is a plate that extends in the X direction across the plurality of battery cells 7 between the pair of cell terminals 7T. Both ends of the stopper 21 extending in the X direction are fixed to the pair of first circumferential side surfaces 2 bat positions in the Z direction at which the electrode surface 7 eshould be restricted.The plurality of slits 22 restrict a position of each battery cell 7 in the X direction such that the battery cells 7 adjacent to each other in the X direction are arranged with a gap therebetween. The plurality of slits 22 are provided on both of the pair of second circumferential side surfaces 2 c. Each slit 22 protrudes from the second circumferential side surface 2 cin the Y direction. Each slot 22 extends in the Z direction. Each slit 22 is projected to be fitted between the battery cells 7 adjacent to each other in the X direction.(Configuration of Bus Bar)As illustrated in FIG. 4, the plurality of bus bars 3 are arranged along the mounting surface 2 a. In the present embodiment, the plurality of bus bars 3 are placed on the wiring module 4. The plurality of bus bars 3 are integrated with the wiring module 4. The plurality of bus bars 3 are formed of a conductive material such as copper or aluminum.The plurality of bus bars 3 includes a plurality of connection bus bars 30 and a pair of output bus bars 35. the plurality of connection bus bars 30 includes a first connection bus bar 31, a second connection bus bar 32, a third connection bus bar 33, and a fourth connection bus bar 34. the pair of output bus bars 35 includes a first output bus bar 36 and a second output bus bar 37.When viewed in the Z direction, the first connection bus bar 31, the third connection bus bar 33, and the second output bus bar 37 are arranged in this order in the +X direction on the -Y direction side with respect to the stopper 21. When viewed in the Z direction, the first output bus bar 36, the second connection bus bar 32, and the fourth connection bus bar 34 are arranged in this order in the +X direction on the +Y direction side with respect to the stopper 21.When viewed in the Y direction, the first connection bus bar 31 among the plurality of connection bus bars 30 is located on the side furthest in the -X direction. When viewed in the Y direction, the first connection bus bar 31 is located between the first output bus bar 36 and the second connection bus bar 32. when viewed in the Y direction, the second connection bus bar 32 is located between the first connection bus bar 31 and the third connection bus bar 33. when viewed in the Y direction, the third connection bus bar 33 is located between the second connection bus bar 32 and the fourth connection bus bar 34. when viewed in the Y direction, the fourth connection bus bar 34 of the plurality of connection bus bars 30 is located on the side furthest in the +X direction. When viewed in the Y direction, the fourth connection bus bar 34 is located between the third connection bus bar 33 and the second output bus bar 37.(First Connection Bus Bar)As illustrated in FIG. 5, the first connection bus bar 31 includes a first extending portion 311, a first spring 312, and a second spring 313.The first extending portion 311 extends in the extending direction DE along the mounting surface 2 a. For example, the first extending portion 311 may have a plate shape extending with a constant width and a constant thickness in the X direction.The first spring 312 is continuously connected to the first extending portion 311 on the -X direction side of the first extending portion 311. The first spring 312 can be connected to the cell terminal 7T on the - Y direction side of the pair of cell terminals 7T of the first battery cell 71. For example, the first spring 312 includes a first leaf spring 314. The first leaf spring 314 has a shape that is bent and extends from the first extending portion 311 in the +X direction, a rounded shape when viewed in the Y direction.Specifically, the first leaf spring 314 extends so as to rise in the +Z direction from a portion to which the first extending portion 311 extends when viewed in the Y direction. Moreover, when viewed in the Y direction, the fourth leaf spring 325 has a shape bent at an obtuse angle in a direction between the +Z direction and the +X direction from a portion to which it extends in the +Z direction and extends with gradual bending in the +X direction from a portion to which it bends. For example, as illustrated in FIG. 6, the second leaf spring 315 may extend continuously from the first extending portion 311, with a width and a thickness of a plate shape of the first extending portion 311.The second spring 313 is continuously connected to the first extending portion 311 on the +X direction side of the first extending portion 311. The second spring 313 may be connected to the cell terminal 7T on the -Y direction side of the pair of cell terminals 7T of the second battery cell 72. For example, the second spring 313 includes a second leaf spring 315. The second leaf spring 315 has a shape that is bent and extends from the first extending portion 311 in the -X direction, a rounded shape when viewed in the Y direction.Specifically, the second leaf spring 315 extends so as to rise in the +Z direction from a portion to which the first extending portion 311 extends when viewed in the Y direction. Moreover, when viewed in the Y direction, the fourth leaf spring 325 has a shape bent at an obtuse angle in a direction between the +Z direction and the -X direction from a portion to which it extends in the +Z direction and extends while gradually bending in the -X direction from a portion to which it bends. For example, as illustrated in FIG. 6, the second leaf spring 315 may extend continuously from the first extending portion 311 with a width and a thickness of a plate shape of the first extending portion 311.(Third Connection Bus Bar)The third connection bus bar 33 includes a third extending portion 331, a fifth spring 332, and a sixth spring 333. The fifth spring 332 is continuously connected to the third extending portion 331 on the -X direction side of the third extending portion 331. The fifth spring 332 may be connected to the cell terminal 7T on the -Y direction side of the pair of cell terminals 7T of the third battery cell 73. The sixth spring 333 is continuously connected to the third extending portion 331 on the +X direction side of the third extending portion 331. The sixth spring 333 can be connected to the cell terminal 7T on the -Y direction side of the pair of cell terminals 7T of the fourth battery cell 74. In other respects, the third extending portion 331, the fifth spring 332, and the sixth spring 333 may have configurations and structures similar to those of the first extending portion 311, the first spring 312, and the second spring 313, respectively.(Second Output Bus Bar)The second output bus bar 37 includes a sixth extending portion 371 and a tenth spring 372. The sixth extending portion 371 penetrates the housing 2 and protrudes from the housing 2 in the +X direction. The tenth spring 372 is continuously connected to the sixth extending portion 371 on the -X direction side of the sixth extending portion 371. The tenth spring 372 may be connected to the cell terminal 7T on the -Y direction side of the pair of cell terminals 7T of the fifth battery cell 75. In other respects, the sixth extending portion 371 and the tenth spring 372 may have configurations and structures similar to those of the first extending portion 311 and the first spring 312, respectively.(Second Connection Bus Bar)As illustrated in FIG. 7, the second connection bus bar 32 includes a second extending portion 321, a third spring 322, and a fourth spring 323.The second extending portion 321 extends in the extending direction DE along the mounting surface 2 a. For example, the second extending portion 321 may have a plate shape extending with a constant width and a constant thickness in the X direction.The third spring 322 is continuously connected to the second extending portion 321 on the -X direction side of the second extending portion 321. The third spring 322 can be connected to the cell terminal 7T on the +Y direction side of the pair of cell terminals 7T of the second battery cell 72. For example, the third spring 322 includes a third leaf spring 324. The third leaf spring 324 has a shape that is bent and extends from the second extending portion 321 in the +X direction, a rounded shape when viewed in the Y direction.Specifically, the third leaf spring 324 extends so as to rise in the +Z direction from a portion to which the second extension portion 321 extends when viewed in the Y direction. Moreover, the third leaf spring 324 has a shape bent at an obtuse angle in a direction between the +Z direction and the +X direction from a portion to which it extends in the +Z direction and extends while gradually bending in the +X direction from a portion to which it bends when viewed in the Y direction. For example, as illustrated in FIG. 6, the third leaf spring 324 may extend continuously from the second extending portion 321, with a width and a thickness of a plate shape of the second extending portion 321.The fourth spring 323 is continuously connected to the second extending portion 321 on the +X direction side of the second extending portion 321. The fourth spring 323 may be connected to the cell terminal 7T on the +Y direction side of the pair of cell terminals 7T of the third battery cell 73. For example, the fourth spring 323 includes a fourth leaf spring 325. The fourth leaf spring 325 has a shape that is bent and extends from the second extending portion 321 in the -X direction, a rounded shape when viewed in the Y direction.Specifically, the fourth leaf spring 325 extends so as to rise in the +Z direction from a portion to which the second extension portion 321 extends when viewed in the Y direction. Moreover, the fourth leaf spring 325 has a shape bent at an obtuse angle in a direction between the +Z direction and the -X direction from a portion to which it extends in the +Z direction and extends while gradually bending in the -X direction from a portion to which it bends when viewed in the Y direction. For example, as illustrated in FIG. 6, the fourth leaf spring 325 may extend continuously from the second extending portion 321 with a width and a thickness of a plate shape of the second extending portion 321.(Fourth Connection Bus Bar)The fourth connection bus bar 34 includes a fourth extending portion 341, a seventh spring 342, and an eighth spring 343. The seventh spring 342 is continuously connected to the fourth extending portion 341 on the -X direction side of the fourth extending portion 341. The seventh spring 342 may be connected to the cell terminal 7T on the +Y direction side of the pair of cell terminals 7T of the fourth battery cell 74. The eighth spring 343 is continuously connected to the fourth extending portion 341 on the +X direction side of the fourth extending portion 341. The eighth spring 343 can be connected to the cell terminal 7T on the +Y direction side of the pair of cell terminals 7T of the fifth battery cell 75. In other respects, the fourth extension portion 341, the seventh spring 342, and the eighth spring 343 may have configurations and structures similar to those of the second extension portion 321, the third spring 322, and the fourth spring 323, respectively.(First Output Bus Bar)The first output bus bar 36 includes a fifth extending portion 361 and a ninth spring 362. The fifth extending portion 361 penetrates the housing 2 and protrudes from the housing 2 in the -X direction. The ninth spring 362 is continuously connected to the sixth extending portion 371 on the +X direction side of the fifth extending portion 361. The ninth spring 362 can be connected to the cell terminal 7T on the +Y direction side of the pair of cell terminals 7T of the first battery cell 71. In other respects, the fifth extension portion 361 and the ninth spring 362 may have configurations and structures similar to those of the second extension portion 321 and the fourth spring 323, respectively.(Configuration of Wiring Module)The wiring module 4 is a device for transmitting voltage information of the plurality of battery cells 7 to the outside of the battery pack 9. as illustrated in FIG. 8, the wiring module 4 includes a signal connector 41, a plurality of voltage signal wires 42, and a molding material 43. the molding material 43 is made of an insulator material such as urethane resin, epoxy resin, or silicone resin.(Signal Connector)The signal connector 41 is a terminal for outputting each voltage signal of the plurality of battery cells 7 to the outside of the battery pack 9. for example, the signal connector 41 can output to the outside of the battery pack 9 by penetrating the case 2 and protruding from the case 2 in the +X direction.(Voltage signal wire)The plurality of voltage signal wires 42 connect each of the plurality of bus bars 3 and the signal connector 41. the plurality of voltage signal wires 42 are connected to the signal connector 41 in the housing 2. For example, one end of each voltage signal wire 42 on the bus bar 3 side may be joined to the bus bar 3 in which a voltage is to be detected by soldering, welding, or the like.(Molding Material)In the molding material 43, a plurality of bus bars 3, the signal connector 41, and the plurality of voltage signal wires 42 are integrated. The molding material 43 has an arc shape spreading as a whole in the XY plane. The molding material 43 is made of a resin material such as epoxy resin, polyimide resin, or fluororesin.For example, the -Z direction side of the molding material 43 may come into contact with the mounting surface 2 a. For example, the molding material 43 may cover an entire periphery of each of the plurality of voltage signal wires 42. For example, the molding material 43 may cover all or part of the extending portion of each bus bar 3 among the plurality of bus bars 3. For example, the molding material 43 may cover only a portion in the housing 2 of the signal connector 41.(Configuration of Cover)The cover 8 has a configuration for closing the opening 2 pof the housing 2 from the +Z direction side. The cover 8 presses each of the plurality of battery cells 7 against the connection bus bar 30 to be connected among the plurality of connection bus bars 30 while closing the opening 2 p. For example, the cover 8 presses the first battery cell 71 and the second battery cell 72 against the first connection bus bar 31 while closing the opening 2 p. As illustrated in FIG. 5, the cover 8 includes a flange 81 and a pressing portion 82. the flange 81 comes into contact with an upper surface 2 sof the housing 2 around the opening 2 p. The pressing portion 82 protrudes from the flange 81 in the -Z direction in the opening 2 pto be fitted into the opening 2 p.With such a configuration of the cover 8, as illustrated in FIG. 9, the cover 8 can press, by the pressing portion 82, each of the plurality of battery cells 7 against the bus bar 3 to be connected while closing the housing 2 by the flange 81. A protruding length of the pressing portion 82 in the -Z direction is a length that can press the plurality of battery cells 7 to a position where a plurality of cell terminals 7T receives a biasing force from each spring of the bus bar 3 to be connected. In contrast, the protruding length of the pressing portion 82 in the -Z direction is shorter than a length that can press the plurality of battery cells 7 to a position where the electrode surface 7 eof the plurality of battery cells 7 comes into contact with the stopper 21. The cover 8 is made of an insulator material such as plastic or a metal material such as aluminum.(Operation and Effect)According to the present embodiment, the first spring 312 and the second spring 313 are continuously connected to the first extending portion 311. With the configuration of the first spring 312 and the second spring 313, the first connection bus bar 31 has a configuration integrally including a connector that receives the cell terminal 7T. With this integration, in the battery case body 1, the first connection bus bar 31 can be directly connected to the first battery cell 71 and the second battery cell 72 accommodated in the case 2. That is, the first connection bus bar 31 functions as both a coupling bus bar and a connection terminal. Therefore, the number of parts of the battery case body 1 can be reduced.Similarly, according to the present embodiment, the third spring 322 and the fourth spring 323 are continuously connected to the second extending portion 321. The fifth spring 332 and the sixth spring 333 are continuously connected to the third extending portion 331. The seventh spring 342 and the eighth spring 343 are continuously connected to the fourth extending portion 341. The ninth spring 362 is continuously connected to the fifth extending portion 361. The tenth spring 372 is continuously connected to the sixth extending portion 371. Therefore, the number of parts of the battery case body 1 can be reduced.According to the present embodiment, a bent portion of the first connection bus bar 31 can function as a connector that receives the cell terminal 7T. With this structure, the first connection bus bar 31 can be processed from a flat metal plate, for example, by sheet metal working. Therefore, it is easy to process the first connection bus bar 31.Similarly, according to the present embodiment, a bent portion of the second connection bus bar 32 can function as a connector that receives the cell terminal 7T. A bent portion of the third connection bus bar 33 may function as a connector that receives the cell terminal 7T. A bent portion of the fourth connection bus bar 34 may function as a connector that receives the cell terminal 7T. A bent portion of the first output bus bar 36 may function as a connector that receives the cell terminal 7T. A bent portion of the second output bus bar 37 may function as a connector that receives the cell terminal 7T. Therefore, each of the bus bars, which are the second connection bus bar 32, the third connection bus bar 33, the fourth connection bus bar 34, the first output bus bar 36, and the second output bus bar 37, will be easily processed.According to the present embodiment, the first spring 312 can be connected to the cell terminal 7T on the -Y direction side of the first battery cell 71. The second spring 313 may be connected to the cell terminal 7T on the -Y direction side of the second battery cell 72. In addition, the third spring 322 may be connected to the cell terminal 7T on the +Y direction side of the second battery cell 72. The fourth spring 323 may be connected to the cell terminal 7T on the +Y direction side of the third battery cell 73. With the configuration of each spring, the battery case body 1 can connect the plurality of battery cells 7 in series.According to the present embodiment, the battery case body 1 has a structure in which the plurality of connection bus bars 30 are arranged along the mounting surface 2 a, and each spring is attached to the plurality of battery cells 7. The structure of the battery case body 1 reduces a work of connecting the plurality of battery cells 7 in the battery case body 1.According to the present embodiment, the battery case body 1 has a structure to and from which the plurality of battery cells 7 can be attached and detached. With this structure of the battery case body 1, the plurality of battery cells 7 can be disassembled from the battery case body 1 without destroying or degrading the cell terminals 7T. Therefore, it is easy to recycle and reuse the battery cell.According to the present embodiment, the molding material 43, the plurality of bus bars 3, the signal connector 41, and the plurality of voltage signal wires 42 are integrated. By this configuration, the wiring module 4 and the plurality of bus bars 3 can be configured integrally. Therefore, the number of parts of the battery case body 1 can be reduced.According to the present embodiment, the stopper 21 can restrict the movement of the battery cell 7 in the -Z direction. This limitation may limit an amount of pressing the plurality of battery cells 7 against the bus bar 3 by the pressing portion 82. Therefore, it is easy to ensure an appropriate contact pressure between the plurality of battery cells 7 and the plurality of bus bars 3.According to the present embodiment, each slit 22 has a structure extending in the Z direction. Due to the structure of each slot 22, the plurality of battery cells 7 are inserted along each slot 22. Therefore, work of inserting the battery cell is reduced.According to the present embodiment, each of the plurality of battery cells 7 is pressed against the bus bar 3 to be connected by the cover 8. With this cover 8, the plurality of pressed battery cells 7 can come into contact with the bus bar 3 while receiving the biasing force from each spring of the bus bar 3 to be connected. Therefore, it is easy to ensure the contact between the plurality of battery cells 7 and the plurality of bus bars 3.(First Modification)In the present embodiment, a wiring module 4 includes a voltage signal wire 42. however, the wiring module 4 is not limited to the voltage signal wire 42, and may be any wire as long as a battery state can be output from a plurality of battery cells 7. As a first modification, as illustrated in FIG. 10, the wiring module 4 may include a plurality of temperature signal wires 44.In the present modification, a battery pack 9 includes a plurality of temperature sensors 91, such as thermistors, capable of detecting temperatures of the plurality of battery cells 7. The plurality of temperature signal wires 44 connect each of the temperature sensors 91 and a signal connector 41.For example, the plurality of temperature sensors 91 may be provided at a side surface position Pa facing in a Y direction of the plurality of battery cells 7 and a bottom surface position Pb facing in a -Z direction of the plurality of battery cells 7, including electrode surfaces 7 e. For example, in the plurality of temperature signal wires 44, a part of a molding material 43 may be cut out, and pattern wiring may be performed at a recessed portion. At the time of wiring, one end of each temperature signal wire 44 is connected to the temperature sensor 91 by solder mounting. In contrast, between the temperature sensor 91 and the pattern wiring, each temperature signal wire 44 may be adhered to the side surface position Pa and the bottom surface position Pb of the plurality of battery cells 7 with an adhesive via a heat transfer material.According to the wiring module 4 of the first modification, the plurality of temperature signal wires 44 and the plurality of bus bars 3 may be integrated while being configured to output the temperature detection signal. Therefore, the number of parts of the battery case body 1 can be reduced.(Second Modification)In the present embodiment, a wiring module 4 includes a plurality of voltage signal wires 42. however, it is not limited to the plurality of voltage signal wires 42, and a configuration having a function of using a detected voltage may be further provided. As a second modification, as illustrated in FIG. 11, the wiring module 4 may include a processing circuit 45 and a compensation circuit 46 in the middle of the plurality of voltage signal wires 42.The processing circuit 45 estimates a battery state of the plurality of battery cells 7. the balancing circuit 46 smoothes a voltage between the plurality of battery cells 7 based on the estimated battery state. A molding material 43 integrally molds a signal connector 41, the plurality of voltage signal wires 42, the processing circuit 45, and the compensation circuit 46 in an arc shape together with a plurality of bus bars 3.According to the wiring module 4 of the second modification, the plurality of bus bars 3, the processing circuit 45, and the balancing circuit 46 may be integrated while being configured to be capable of smoothing the voltage between the plurality of battery cells 7. Therefore, the number of parts of the battery case body 1 can be reduced.(Other Modification)In the present embodiment, each of a first leaf spring 314, a second leaf spring 315, a third leaf spring 324, and a fourth leaf spring 325 has a curved and extending shape, a rounded shape when viewed in a Y direction. However, each leaf spring may have any shape as long as the leaf spring has a structure that can be formed of a plate material to be integrated with a corresponding extending portion and is bent and extends from the corresponding extending portion. As a modification, each leaf spring may be bent and extend in any shape such as a C shape, a U shape, an L shape, and a V shape from the extending portion as viewed in the Y direction.In an example of the present embodiment, a battery case body 1 is configured such that an insertion direction of a plurality of battery cells 7 into a battery case body 1 is a downward direction. However, the battery case body 1 may be configured in any manner as long as the battery case body 1 can accommodate the plurality of battery cells 7 and the plurality of battery cells 7 can be attached to and detached from the battery case body 1. As a modification, in the battery case body 1, an opening 2 pmay be provided at a lower side, and a mounting surface 2 amay be provided at an upper side. As another modification, in the battery case body 1, the opening 2 pmay be provided at a first lateral side, the mounting surface 2 amay be provided at a second lateral side.In the present embodiment, the plurality of bus bars 3 include, as a plurality of connection bus bars 30, a first connection bus bar 31, a second connection bus bar 32, a third connection bus bar 33, and a fourth connection bus bar 34. As a modification, a plurality of bus bars 3 may include only three or fewer connection bus bars 30. As another modification, the plurality of bus bars 3 may include five or more connection bus bars 30.In the present embodiment, as illustrated in FIG. 4, the plurality of bus bars 3 are arranged. However, the plurality of bus bars 3 may be arranged in any manner as long as the plurality of battery cells 7 can be connected.In the present embodiment, the first connection bus bar 31 is connected to a first battery cell 71 as a first battery cell and a second battery cell 72 as a second battery cell, but may be connected to any battery cell. As a modification, the first connection bus bar 31 may be connected to the second battery cell 72 as the first battery cell and a third battery cell 73 as the second battery cell. In addition, in this modification, the second connection bus bar 32 may be connected to the third battery cell 73 as the second battery cell and a fourth battery cell 74 as a third battery cell. As another modification, the first connection bus bar 31 may be connected to the third battery cell 73 as the first battery cell and the fourth battery cell 74 as the second battery cell. In addition, in this modification, the second connection bus bar 32 may be connected to the fourth battery cell 74 as the second battery cell and a fifth battery cell 75 as a third battery cell.In the present embodiment, the plurality of bus bars 3 are placed on a wiring module 4 to be integrated therewith. However, any configuration may be adopted as long as the number of parts of each bus bar can be reduced. As a modification, it is possible that the plurality of bus bars 3 are not mounted to the wiring module 4 but are directly mounted to the mounting surface 2 aseparately without being integrated.In the present embodiment, the battery case body 1 accommodates a pair of cell terminals 7T of each battery cell 7 so as to face the mounting surface 2 a. However, as long as the plurality of connection bus bars 30 can connect the plurality of battery cells, the battery case body 1 may accommodate any plurality of battery cells. As a modification, the battery case body 1 may accommodate the battery cell 7 in which one cell terminal 7T of the pair of cell terminals 7T faces the mounting surface 2 ain place of the battery cell 7 in which the pair of cell terminals 7T faces the mounting surface 2 a. That is, the housing 2 may be capable of accommodating at least one cell terminal 7T of the pair of cell terminals 7T so as to face the mounting surface 2 a. Each spring may be connectable to one cell terminal 7T of the pair of cell terminals 7T with respect to the plurality of battery cells 7 of the present modification accommodated as described above.While preferred embodiments of the invention have been described and illustrated above, it should be understood that these are exemplary of the invention and are not to be considered limiting. The embodiments may be implemented in various other forms, and various omissions, substitutions, and changes may be made without departing from the spirit of the present disclosure. Accordingly, the invention is not to be considered as limited by the foregoing description, and is limited only by the scope of the appended claims.INDUSTRIAL APPLICABILITYA battery case body and a battery pack according to the present disclosure can reduce the number of parts.Brief Description of the Reference Numerals1 Battery case body 2 Case 2 aMount surface 2 bFirst peripheral side surface 2 cSecond peripheral side surface 2 pOpen 2 s Obere surface 2 v Gehäuse space 3 Bus bar 4 Wiring module 7 Battery cell 7 eElectrode surface 7T Cell terminal 8 Cover 9 Battery pack 21 Stopper 22 Slit 30 Connection bus bar 31 First connection bus bar 32 Second connection bus bar 33 Third connection bus bar 34 Fourth connection bus bar 35 Output bus bar 36 First output bus bar 37 Second output bus bar 41 Signal connector 42 Voltage signal wire 43 Molding material 44 Temperature signal wire 45 Processing circuit 46 Compensation circuit 71 First battery cell 72 Second battery cell 73 Third battery cell 74 Fourth battery cell 75 Fifth battery cell 81 Flange 82 Pressing portion 91 Temperature sensor 311 First extending portion 312 First spring 313 Second spring 321 second extension portion 322 third spring 323 fourth spring 331 third extension portion 332 fifth spring 333 sixth spring 341 fourth extension portion 342 seventh spring 343 eighth spring 361 fifth extension portion 362 ninth spring 371 sixth extension portion 372 tenth spring DE extension direction DR attachment / detachment direction DS separation direction Pa side surface position Pb bottom surface positionReferences included in the specificationThis list of documents cited by the applicant has been produced in an automated manner and is only included for the better information of the reader. The list is not part of the German patent application or utility model application. The DPMA does not take any adhesion for any faults or omissions.Patent Literature citedJP 2019-149227 [0002, 0003]

Claims

A battery case body (1), comprising: a case (2) having a mounting surface (2a), the case (2) being capable of accommodating a plurality of battery cells (7), each having a pair of cell terminals (7T) separated from each other in a separating direction (DS), the pair of cell terminals (7T) facing the mounting surface (2a); and a first connection bus bar (31) having a first extending portion (311) extending in an extending direction (DE) along the mounting surface (2a), a first spring (312) continuously connected to the first extending portion (311) at a first side in the extending direction (DE) of the first extending portion (311), and a second spring (313) continuously connected to the first extending portion (311), A second side in the extending direction (DE) of the first extending portion (311) is continuously connected to the first extending portion (311), wherein the plurality of battery cells (7) comprises a first battery cell (71) and a second battery cell (72), the first spring (312) is connectable to a cell terminal (7T) on a first side in the separating direction (DS) of the pair of cell terminals (7T) of the first battery cell (71), and the second spring (313) is connectable to a cell terminal (7T) on a first side in the separating direction (DS) of the pair of cell terminals (7T) of the second battery cell (72).The battery case body (1) according to claim 1, wherein the first spring (312) comprises a first leaf spring having a shape bent and extending from the first extending portion (311) to the second side in the extending direction (DE), and the second spring (312) comprises a second leaf spring having a shape bent and extending from the first extending portion (311) to the first side in the extending direction (DE).The battery case body (1) according to claim 1 or 2, wherein the plurality of battery cells further comprises a third battery cell (73), the first battery cell (71), the second battery cell (72), and the third battery cell (73) are arranged side by side in the order in the extending direction (DE), a second connection bus bar (32) having a second extending portion (321) extending in the extending direction (DE) along the mounting surface (2a), a third spring (322) continuously connected to the second extending portion (321) on the first side in the extending direction (DE) of the second extending portion (321), and a fourth spring (323) continuously connected to the second side in the extending direction (DE) of the second extending portion (321), Further, the third spring (322) is continuously connected to the second extending portion (321), and the fourth spring (323) is connectable to a cell terminal (7T) on the second side in the separating direction (DS) from the pair of cell terminals (7T) of the second battery cell (72), and the fourth spring (323) is connectable to a cell terminal (7T) on the second side in the separating direction (DS) from the pair of cell terminals (7T) of the third battery cell (73).The battery case body (1) according to claim 3, further comprising: a wiring module (4) including a signal connector (41), a plurality of voltage signal wires (42), and a molding material (43), the signal connector (41) being capable of outputting a voltage signal from each of the plurality of battery cells (7), the plurality of voltage signal wires (42) connecting each of the first connection bus bar (31) and the second connection bus bar (32) to the signal connector (41), the molding material (43) integrating the first connection bus bar (31), the second connection bus bar (32), the signal connector (41), and the plurality of voltage signal wires (42).The battery case body (1) according to claim 4, wherein the wiring module (4) further comprises a temperature signal wire (44) connecting a temperature sensor (91) and the signal connector (41), the temperature sensor (91) being capable of detecting temperatures of the plurality of battery cells (7).The battery case body (1) according to claim 4, wherein the wiring module (4) further comprises a processing circuit (45) that estimates a battery state of the plurality of battery cells (7) and a balancing circuit (46) that smoothes a voltage between the plurality of battery cells (7) based on the battery state.The battery case body (1) according to claim 1 or 2, wherein each battery cell (7) includes an electrode surface (7e) from which the pair of cell terminals (7T) protrudes, and the case (2) includes a stopper (21) that comes into contact with the electrode surface (7e) and restricts movement of the battery cell (7).A battery pack (9) comprising: the battery case body (1) according to claim 1 or 2; and the plurality of battery cells (7).The battery pack (9) according to claim 8, wherein the housing (2) includes an opening (2p), and a cover (8) that presses the first battery cell (71) and the second battery cell (72) against the first connection bus bar (31) while closing the opening (2p) is further included.A battery case body (1), comprising: a case (2) having a mounting surface (2a), the case (2) being capable of accommodating a plurality of battery cells (7) each having a pair of cell terminals (7T), at least one cell terminal (7T) of the pair of cell terminals (7T) facing the mounting surface (2a); and a first connection bus bar (31) having a first extending portion (311) extending in an extending direction (DE) along the mounting surface (2a), a first spring (312) continuously connected to the first extending portion (311) at a first side in the extending direction (DE) of the first extending portion (311), and a second spring (313) arranged in a continuous manner, A second side in the extending direction (DE) of the first extending portion (311) continuously connected to the first extending portion (311), wherein the plurality of battery cells (7) includes a first battery cell (71) and a second battery cell (72), the first spring (312) is connectable to the one cell terminal (7T) of the pair of cell terminals (7T) of the first battery cell (71), and the second spring (313) is connectable to the one cell terminal (7T) of the pair of cell terminals of the second battery cell (72).

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