JP7172901B2 - power storage device - Google Patents

Description

The present disclosure relates to power storage devices.

2. Description of the Related Art A power storage device including a plurality of power storage modules is conventionally known. For example, a power storage device described in Japanese Patent Laying-Open No. 2007-317400 includes an upper power storage module, a lower power storage module, and a plurality of electric wires.

Japanese Patent Application Laid-Open No. 2007-317400

For example, in order to electrically connect three or more power storage modules directly, it is conceivable to electrically connect adjacent power storage modules with a connection cable.

At this time, when adjacent power storage modules are connected by a connection cable, the bending radius of the connection cable becomes small because the distance between the adjacent power storage modules is short.

Here, since a large current generally flows through a connection cable that connects power storage modules, the cross-sectional diameter of the connection cable tends to be large. A connection cable with a large cross-sectional diameter is difficult to bend, and if the bending radius is reduced, the connection cable is likely to break or be damaged.

The present disclosure has been made in view of the problems described above, and an object thereof is to provide a power storage device in which a plurality of power storage modules are arranged, in which a connection cable connecting the power storage modules can be prevented from being damaged. to provide the equipment.

A power storage device according to the present disclosure includes a plurality of power storage modules spaced apart in the separation direction, a plurality of connection cables electrically connecting the power storage modules, and a connection connecting the power storage modules adjacent in the separation direction. and the plurality of power storage modules include a first power storage module, a second power storage module, a third power storage module, and a fourth power storage module, which are sequentially arranged with a gap in the separation direction. The connection cable includes a first connection cable that connects the first power storage module and the third power storage module, and a second connection cable that connects the second power storage module and the fourth power storage module, and the connection device is the second power storage module. and the third power storage module, or the third power storage module and the fourth power storage module are electrically connected, and the connection device includes a storage case and a bus bar provided in the storage case, and is connected to the connection device The energy storage modules thus connected were connected to each other through a busbar.

According to the power storage device, it is possible to suppress the bending radii of the first connection cable and the second connection cable from becoming small. Furthermore, when connecting adjacent power storage modules, they are connected through a bus bar provided in the connecting device, and no connection cable is used. As a result, the occurrence of adverse effects associated with bending the connection cable is suppressed.

According to the power storage device according to the present disclosure, in a power storage device in which a plurality of power storage modules are arranged, a power storage device capable of suppressing damage to a connection cable connecting the power storage modules is provided.

1 is a schematic diagram schematically showing a vehicle 1 equipped with a power storage device according to the present embodiment; FIG. 2 is a bottom view showing the bottom surface of the vehicle 1; FIG. 2 is a plan view schematically showing an electricity storage unit 22. FIG. 2 is a plan view schematically showing an electricity storage module 23A; FIG. FIG. 3 is a plan view schematically showing a power storage device 3A according to a comparative example; 3 is a plan view schematically showing a junction box 21, a power storage module 23A, and the like in the power storage device 3. FIG. 6 is a plan view showing a configuration of a junction box and its surroundings in the power storage device 3A shown in FIG. 5. FIG. FIG. 3 is a plan view schematically showing a power storage device 3B that is a modification of the power storage device 3; 3 is a plan view showing a configuration of a junction box and its surroundings in power storage device 3B. FIG. FIG. 11 is a plan view showing a power storage device 3C according to a second modified example; FIG. 11 is a plan view showing a power storage device 3C according to a second modified example; It is a top view which shows 23 A of electrical storage modules.

A power storage device according to the present embodiment will be described with reference to FIGS. 1 to 12. FIG. Among the configurations shown in FIGS. 1 to 9, the same or substantially the same configurations are denoted by the same reference numerals, and overlapping descriptions are omitted. In addition, in the configurations described in the embodiments, configurations corresponding to configurations described in claims may be written together with the configurations in the claims in parentheses.

FIG. 1 is a schematic diagram schematically showing a vehicle 1 equipped with a power storage device according to the present embodiment. Vehicle 1 includes vehicle body 2 , power storage device 3 , drive device 4 , and fuel tank 5 . An engine compartment 8 and a vehicle interior space 9 are formed in the vehicle body 2 . The engine compartment 8 is formed on the front F side of the vehicle interior space 9 . Vehicle body 2 includes a floor panel 6 that forms the bottom surface of vehicle 1 .

The drive device 4 is housed within the engine compartment 8 . Drive device 4 includes an engine 10, a rotating electrical machine MG1, and a rotating electrical machine MG2. The engine 10 burns gasoline or the like supplied from the fuel tank 5 to generate driving force for rotating the driving wheels. The rotary electric machine MG1 mainly functions as a generator, and the rotary electric machine MG2 generates driving force for rotating the driving wheels by using electric power supplied from the power storage device 3 .

A PCU (power control unit) 11 is also accommodated in the engine compartment 8, and the PCU 11 includes a converter and an inverter. The converter boosts the DC power supplied from power storage device 3 and supplies it to the inverter, which converts the DC power into three-phase AC power and supplies it to, for example, rotary electric machine MG2.

Power storage device 3 and fuel tank 5 are arranged on the lower surface side of floor panel 6 . Note that the power storage device 3 is arranged on the forward direction F side of the fuel tank 5 .

FIG. 2 is a bottom view showing the bottom surface of the vehicle 1. FIG. Power storage device 3 includes housing case 20 , junction box 21 , and power storage unit 22 . The storage case 20 is made of, for example, metal such as aluminum or resin.

Junction box 21 and power storage unit 22 are housed in housing case 20 . Junction box 21 is connected to PCU 11 by power cables 24 and 25 .

Junction box 21 is electrically connected to power storage unit 22 by connection cables 26 and 27 .

FIG. 3 is a plan view schematically showing the power storage unit 22. As shown in FIG. Electricity storage unit 22 includes a plurality of electricity storage modules 23A, 23B, 23C, and 23D and a plurality of connection cables 30 and 31 .

The power storage modules 23A, 23B, 23C, and 23D are spaced apart from each other in the direction from the left side to the right side of the vehicle 1 (separation direction). The configuration of each power storage module 23A, 23B, 23C, 23D is substantially the same. Therefore, the configuration of the power storage module 23A will be described in detail.

FIG. 4 is a plan view schematically showing the power storage module 23A. The power storage module 23A includes a plurality of power storage cells 40A, end plates 41A and 42A, a plurality of busbars 43A, and terminal busbars 44A and 45A.

The storage cell 40A includes a housing case 50A and external terminals 51A and 52A. The storage case 50A accommodates an electrode assembly and an electrolytic solution (not shown). The storage cell 40A is, for example, a secondary battery such as a lithium ion battery. The external terminal 51A is, for example, a positive external terminal, and the external terminal 52A is, for example, a negative external terminal. The plurality of power storage cells 40A are arranged in the longitudinal direction of the vehicle 1 .

Each bus bar 43A connects the storage cells 40 adjacent to each other in the longitudinal direction of the vehicle 1 so as to be electrically in series.

The end plate 41A is arranged at one end of the power storage module 23A in the longitudinal direction of the vehicle 1, and the end plate 42A is arranged at the other end of the power storage module 23A.

The end plate 41A includes a plate body 46A and connection terminals 47A. The plate body 46A is a plate-shaped insulating member, and the connection terminals 47A are provided on the plate body 46A. Similarly, the end plate 42A includes a plate body 48A and connection terminals 49A.

A terminal bus bar 44A is connected to the storage cell 40A provided at a position adjacent to the end plate 41A, and the terminal bus bar 44A is connected to the connection terminal 47A. Similarly, a terminal bus bar 45A is connected to the storage cell 40A provided at a position adjacent to the end plate 42A, and the terminal bus bar 45A is connected to the connection terminal 49A.

Returning to FIG. 3, power storage modules 23B, 23C, 23D include a plurality of power storage cells, end plates 41B, 41C, 41D, end plates 42B, 42C, 42D, and a plurality of busbars.

In each storage module 23B, 23C, 23D, each storage cell is electrically connected in series by a bus bar.

Connection terminals 47B, 47C and 47D are provided on the end plates 41B, 41C and 41D, respectively, and connection terminals 49B, 49C and 49D are provided on the end plates 42B, 42C and 42D.

The connection cable 30 electrically connects the connection terminal 47B and the connection terminal 47D, and the connection cable 31 electrically connects the connection terminal 47A and the connection terminal 47C.

Therefore, the connection cable (first connection cable) 31 connects the power storage module (first power storage module) 23A and the power storage module (third power storage module) 23C, and the connection cable (second connection cable) 30 electrically connects the power storage module (second power storage module) 23B and the power storage module (fourth power storage module) 23D.

Between power storage module 23B and power storage module 23D electrically connected by connection cable 30, power storage module 23C is arranged.

Therefore, in the left-to-right direction (separation direction) of the vehicle 1, the distance between the connection terminal 47B and the connection terminal 47D to which the connection cable 30 is connected is equal to the distance between the adjacent connection terminal 47B and the connection terminal 47C. longer than

Here, since a large current flows through the connection cables 30 and 31 when the power storage device 3 is charged and discharged, the cross-sectional diameters of the connection cables 30 and 31 are large. Therefore, the allowable bending radius with which the connection cables 30 and 31 can be bent is long. For example, let the allowable bending radius with which the connection cables 30 and 31 can be bent be an allowable bending radius R1.

For example, connection cable 30 includes end portion 55 , bend portion 56 , straight portion 57 , bend portion 58 and end portion 59 . The end portion 55 is connected to the connection terminal 47B. The bent portion 56 is bent in an arc shape, and the bending radius of the bent portion 56 is the allowable bending radius R1. The straight portion 57 connects the bent portion 56 and the straight portion 57 . The bent portion 58 is also bent in an arc shape, and the bending radius of the bent portion 58 is also the allowable bending radius R1. The end portion 59 is connected to the connection terminal 47D.

Since the distance between the connection terminal 47B and the connection terminal 47D to which the connection cable 30 is connected is thus long, the bending radii of the bent portions 56 and 58 can be made equal to or greater than the allowable bending radius R1.

Similarly, the power storage module 23B is positioned between the connection terminal 47A and the connection terminal 47C to which the connection cable 31 is connected, and the distance between the connection terminal 47A and the connection terminal 47C is long. Therefore, the bending radius of the bending portion of the connection cable 31 can be made equal to or larger than the allowable bending radius R1.

FIG. 5 is a plan view schematically showing a power storage device 3A according to a comparative example. The power storage device 3A includes connection cables 60 and 61 instead of the connection cables 30 and 31, and further includes a connection cable 62. FIG.

The connection cable 60 connects the connection terminal 47D of the power storage module 23D and the connection terminal 47C of the power storage module 23C. The connection cable 62 connects the connection terminal 49C of the power storage module 23C and the connection terminal 49B of the power storage module 23B. The connection cable 61 connects the connection terminal 47B of the power storage module 23B and the connection terminal 47A of the power storage module 23A.

Here, the distance between the connection terminal 47D and the connection terminal 47C may be smaller than (permissible bending radius R1×2).

At this time, if the connection cable 60 is bent so that the bending radius of the connection cable 60 becomes smaller than the allowable bending radius R1, the connection cable 60 may be damaged. On the other hand, if the bending radius of the connection cable 60 is set to the permissible bending radius R1, the area where the connection cable 60 is installed becomes large as indicated by the dashed line, resulting in an increase in the size of the power storage device 3.

Although the connection cable 60 has been described, the connection cables 61 and 62 also have the same problem.

On the other hand, in the power storage device 3 shown in FIG. 3, since the distance between the connection terminals to which the connection cables 30 and 31 are connected is longer than the allowable bending radius R1, the occurrence of the above-described adverse effects is suppressed. .

FIG. 6 is a plan view schematically showing the junction box 21, the power storage module 23A, and the like in the power storage device 3. As shown in FIG. Junction box 21 is arranged in front of power storage module 23B and power storage module 23C. Junction box 21 includes SMR (system main relay) 1 , SMR 2 , connection device 32 , and case 67 . The SMR1, the SMR2, and the connection device 32 are housed inside the case 67. As shown in FIG.

A connection cable 26 and a connection cable 27 are connected to the junction box 21 . The connection cable 26 electrically connects the connection terminal 49A of the power storage module 23A and the SMR1. The connection cable 27 electrically connects the connection terminal 49D of the power storage module 23D and the SMR2.

Here, the connection cable 26 and the connection cable 27 are formed linearly, and the bending radii of the connection cables 26 and 27 are larger than the allowable bending radius R1.

The SMR 1 switches the electrical connection state of the power cable 24 and the connection cable 26 , and the SMR switches the electrical connection state of the power cable 25 and the connection cable 27 .

The connection device 32 includes a terminal 68 , a terminal 69 and a busbar 70 . A connection wiring 65 is connected to the terminal 68, and the connection wiring 65 is connected to the connection terminal 49B. A connection wiring 66 is connected to the terminal 69, and the connection wiring 66 is connected to the connection terminal 49C.

The terminal 68 is provided on the front side of the connection terminal 49B, and the connection wiring 65 is formed in a straight line. Similarly, the terminal 69 is provided on the front side of the connection terminal 49C, and the connection wiring 66 is also formed linearly. The bending radii of the connection wiring 65 and the connection wiring 66 are larger than the allowable bending radius R1. The busbar 70 is a conductive plate-like member. Bus bar 70 electrically connects terminal 68 and terminal 69 .

By connecting the connecting terminals 49B and 49C that are close to each other through the bus bar 70 of the connecting device 32 in this way, it is possible to suppress the bending radii of the connecting wires 65 and 66 from becoming small.

FIG. 7 is a plan view showing a configuration of a junction box and its surroundings in power storage device 3A shown in FIG.

Power storage device 3A also includes junction box 21A and connection cables 26 and 27 . In power storage device 3A, connection terminal 49B and connection terminal 49C are connected by connection cable 62, so connection device 32 is not provided in junction box 21A.

Here, since the bending radius of the connection cable 62 cannot be significantly reduced from the allowable bending radius R1, the connection cable 62 may interfere with the junction box 21A.

On the other hand, as shown in FIG. 6, in power storage device 3 according to the present embodiment, connection wiring 65 connected to connection terminal 49A and connection wiring 66 connected to connection terminal 49C are connected through bus bar 70. Connected. Thereby, it is not necessary to bend the connection wiring 65 and the connection wiring 66, and it is possible to suppress the occurrence of adverse effects such as those in the power storage device 3A shown in FIG. 7 and the like.

Power storage modules 23A, 23B, 23C, and 23D are electrically connected in series by connection cables 30 and 31 and connection device 32 .

FIG. 8 is a plan view schematically showing a power storage device 3B that is a modification of power storage device 3, and FIG. 9 is a plan view showing a configuration of a junction box and its surroundings in power storage device 3B. 8 and 9, in power storage device 3B, connection device 32B includes connection wirings 65B and 66B, a case 67B, and terminals 68B and 69B.

The connection wiring 65B connects the connection terminal 49A and the terminal 68B, and the connection wiring 66B connects the connection terminal 49B and the terminal 69B. A fuse 71 is provided in the connection cable 30 in this power storage device 3B.

In power storage device 3B, when power storage device 3B is charged and discharged, the direction of current flowing in connection cable 30 and the direction of current flowing in connection cable 31 are opposite to each other. Therefore, when noise flows through the connection cables 30 and 31, the phases of the electromagnetic wave noise radiated around the connection cable 30 and the electromagnetic wave noise radiated around the connection cable 30 are opposite to each other. will cancel each other out. As a result, even if an antenna for a radio (AM and FM) or the like is placed behind the vehicle 1, the antenna can receive signals well from the outside. Also in power storage device 3B, the distance between connection terminals to which connection cables 30 and 31 are connected is longer than allowable bending radius R1, and adjacent connection terminals are connected by connection device 32B. Therefore, in the power storage device 3B as well, the same actions and effects as those of the power storage device 3 can be obtained.

10 and 11 are plan views showing a power storage device 3C according to the second modification, and FIG. 12 is a plan view showing a power storage module 23A. 10, 11 and 12, in power storage device 3C, end plates 41A, 41B, 41C, 41D, 42A, 42B, 42C and 42D are not provided with connection terminals.

The connection cables 30 and 31 are connected to external terminals of the storage cells of the storage modules 23B, 23D, 23A and 23C. Similarly, the connection cables 26, 27 and the connection wires 65, 66 are also connected to the external terminals of the storage cells provided in the respective storage modules 23A, 23B, 23C, 23D.

Specifically, as shown in FIG. 12, one end of the connection cable 31 is connected to the external terminal 51A of the storage cell 40A adjacent to the end plate 41A.

Similarly, one end of the connection cable 26 is connected to the external terminal 52A of the storage cell 40A adjacent to the end plate 42A.

In this way, each of the connection cables 30, 31, 26, 27 and the connection wires 65, 66 may be connected to the external terminals of the storage cells.

It should be considered that the embodiments disclosed this time are illustrative in all respects and not restrictive. The scope of the present invention is indicated by the claims, and is intended to include all changes within the meaning and range of equivalents to the claims.

Reference Signs List 1 vehicle, 2 vehicle body, 3, 3A, 3B power storage device, 4 drive device, 5 fuel tank, 6 floor panel, 8 engine compartment, 9 vehicle interior space, 10 engine, 20, 50A storage case, 21 junction box, 22 Power storage unit 23A, 23B, 23C, 23D Power storage module 24, 25 Power cable 26, 27, 30, 31, 60, 61, 62 Connection cable 32, 32B Connection device 40, 40A, 40B, 40C, 40D storage cells 41A, 41B, 41C, 41D, 42A, 42B, 42C, 42D end plates, 43A busbars, 44A, 45A terminal busbars, 46A, 48A, 48B plate bodies 47A, 47B, 47C, 47D, 49A, 49B, 49C, 49D connection terminal, 51A, 52A external terminal, 55, 59 end, 56, 58 bent portion, 57 straight portion, 65, 65B, 66, 66B connection wiring, 67, 67B case, 68, 68B, 69, 69B terminal, 70 connecting plate, 71 fuse, F forward, MG1, MG2 rotating electric machine, R1 radius.

Claims (1)

a plurality of power storage modules spaced apart in one direction;
a plurality of connection cables electrically connecting the power storage modules;
a connection device that connects the power storage modules adjacent to each other in the one direction;
with
the plurality of power storage modules include a first power storage module, a second power storage module, a third power storage module, and a fourth power storage module;
the first to fourth power storage modules are arranged in the one direction in order of the first to fourth power storage modules;
The plurality of connection cables includes a first connection cable that connects the first power storage module and the third power storage module, and a second connection cable that connects the second power storage module and the fourth power storage module,
The connection device electrically connects the adjacent second power storage module and the third power storage module or the adjacent third power storage module and the fourth power storage module,
The connection device includes a housing case and a bus bar provided in the housing case,
the power storage modules connected to the connection device are connected to each other through the bus bar ,
a power storage module connected to the connection device is connected to the bus bar by a connection wiring,
The power storage device , wherein the connection wiring is formed in a straight line .

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