JP6068418B2 - Power storage device - Google Patents

Description

  The present invention relates to a power storage device including a storage battery block in which a plurality of storage batteries are stacked.

  For example, in a hybrid vehicle or an electric vehicle such as an EV, a high-voltage power storage module including a storage battery block (battery module) in which a plurality of storage batteries (battery cells) are stacked is mounted as a motor driving power source. For this reason, in order to drive and control the motor, the output of the high-voltage power storage module is sent to the inverter device via a relay device having a contactor, a fuse, and the like, and direct-current power is converted into alternating current and supplied to the motor.

  As this type of high voltage power storage module, for example, an assembled battery disclosed in Patent Document 1 is known. In this assembled battery, a plurality of, for example, four battery blocks in which a plurality of battery cells are stacked are arranged. The plurality of battery blocks are covered with an upper case and a lower case having a U-shaped cross section, and both end edges of the upper case and the lower case are covered with side plates. The upper case, the lower case, and the pair of side plates constitute an outer case.

JP 2011-23180 A

  By the way, the battery block is provided with positive and negative terminals, and the terminals are connected to a relay device, for example. For this reason, the exterior case is formed with an opening (hole) through which the terminal is inserted. However, there is a problem in that high-frequency noise is generated from the battery block, which gives the passenger discomfort due to the noise.

  The present invention solves this type of problem, and an object thereof is to provide a power storage device that can reliably suppress high-frequency sound from a storage battery from leaking to the outside with a simple configuration.

  The power storage device according to the present invention includes a storage battery block in which a plurality of storage batteries are stacked. The storage battery block is held by a holding member, and the holding member is provided with an opening through which a terminal of the storage battery block is inserted. The holding member is provided with a seal member that circulates around the opening, and a cover member that is in contact with the seal member and covers the opening is attached to the holding member.

  Further, in this power storage device, a conductive member surrounded by an insulating member is connected to the terminal, the insulating member is provided with an intersecting portion straddling the seal member, and the intersecting portion has a wedge shape in cross section. Is preferred.

  Furthermore, in this power storage device, the cover member is preferably provided with another seal member that overlaps the seal member.

  According to the present invention, the opening through which the terminal of the storage battery block is inserted is circulated by the seal member, and the cover member is in contact with the seal member so as to cover the opening. For this reason, it can suppress reliably that the high frequency sound generated from a storage battery leaks outside from the clearance gap between an opening part and a terminal by simple structure. Thereby, it becomes possible to prevent the passenger from feeling uncomfortable due to noise as much as possible.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1 is a plan view illustrating an electric vehicle in which a power storage device according to an embodiment of the present invention is incorporated. It is a schematic perspective view of the equipment accommodated in the center console constituting the electric vehicle. It is a plane explanatory view of the power storage device. It is circuit explanatory drawing of the said apparatuses. It is the VV sectional view taken on the line of the said electrical storage apparatus in FIG. It is a disassembled perspective explanatory drawing of the 1st wiring and 2nd wiring which comprise the said electrical storage apparatus. It is a perspective explanatory view of the first wiring and the second wiring. It is sectional explanatory drawing of the 1st wiring and 2nd wiring of a comparative example.

  As shown in FIG. 1, an electric vehicle (for example, a hybrid vehicle or EV) 10 in which a power storage device according to an embodiment of the present invention is incorporated includes a motor 12 that is driven by electricity. Traveled. The motor 12 is disposed in the front room (engine room) 14 of the electric vehicle 10 and applies a rotational force to at least one of the front wheel 16F or the rear wheel 16R.

  A center console 22 is formed in the center of the vehicle cabin 18 constituting the electric vehicle 10 so as to extend in the front-rear direction (arrow A direction) between the left and right front seats 20R, 20L.

  As shown in FIGS. 1 and 2, in the center console 22, there are an inverter unit (PCU) 24, a junction board 28 including a relay device 26, an impact resistant member 30, a battery ECU (battery management device) 32, and a battery module 34. Is placed. The impact resistant member 30 has a flat plate shape, and the junction board 28 is fixed to one surface, and the battery ECU 32 is fixed to the other surface.

  The inverter device 24 controls the rotational drive of the motor 12, the relay device 26 can cut off the current between the motor 12 and the battery module 34, and the battery ECU 32 manages the battery module 34.

  The battery module 34 constitutes a power storage device 35 according to the present embodiment, and stores power for rotationally driving the motor 12. The battery module 34 is configured by arranging a plurality of sets in which a plurality of storage batteries (battery cells) 36 are stacked, for example, four sets of storage battery blocks 36M.

  As shown in FIGS. 2 and 3, the battery module 34 has a positive terminal (+ electrode) 38a1 and a negative terminal (−electrode) 38b1 provided at both ends in the series direction of the four battery blocks 36M. The battery module 34 has a positive electrode terminal (+ electrode) 38a2 and a negative electrode terminal (−electrode) 38b2 provided at the center in the series direction of the four sets of storage battery blocks 36M.

  As shown in FIG. 4, the positive terminal 38a2 and the negative terminal 38b2, which are the central portions of the four sets of storage battery blocks 36M, are connected to the switch unit 41 via wirings 40a and 40b. The switch unit 41 includes a main switch 42 and a main fuse 43, and four sets of storage battery blocks 36M can be connected in series. Two sets of storage battery blocks 36M are electrically connected in series.

  The first wiring 44 a connected to the positive terminal 38 a 1 of the battery module 34 and the second wiring 44 b connected to the negative terminal 38 b 1 of the battery module 34 are connected to the inverter device 24 via the relay device 26. The

  The relay device 26 includes main contactors 46a and 46b, a precharge contactor 48, and a precharge resistor 50 connected in parallel to each other. The main contactors 46a and 46b and the precharge contactor 48 can be opened and closed by the battery ECU 32, respectively.

  A downverter 62 for converting the output voltage of the battery module 34 is connected to the first wiring 44a and the second wiring 44b. The first wiring 44a and the second wiring 44b are connected to the ground through capacitors 64a and 64b. The first wiring 44 a and the second wiring 44 b are connected to the inverter device 24, and the inverter device 24 is connected to the motor 12 via a three-phase cable 66.

  As shown in FIG. 2, in the center console 22, a lower plate 70a, an upper plate (holding member) 70b, and side plates 70c and 70d constituting the casing 68 are arranged. A cover member 71 is attached to the upper plate 70b by screwing or the like. Although not shown, other devices and plates are arranged at both ends of the casing 68 in the direction of arrow A.

  As shown in FIG. 1, an arrangement space 72 is formed inside the casing 68. In the arrangement space 72, the inverter device 24, the relay device 26, the battery ECU 32, and the battery module 34 are arranged in this order from the front side to the rear side in the vehicle front-rear direction (arrow A direction) (arrow Ar direction). A fan 74 is disposed in the front part of the inverter device 24.

  As shown in FIG. 2, the battery module 34 is held between the lower plate 70 a and the upper plate 70 b via a plurality of bolts 73. In the impact-resistant member 30, two screw portions 75a are arranged at the lower and upper bent portions 30a and 30b, and a nut 75b is fastened to each screw portion 75a.

  As shown in FIG. 3, the upper plate 70b is formed with a first opening 76a through which the positive terminal 38a1 and the negative terminal 38b1 are inserted. The upper plate 70b is formed with a second opening 76b and a third opening 76c that are located on both sides of the first opening 76a and through which the positive terminal 38a2 and the negative terminal 38b2 are inserted. A fourth opening 76d corresponding to the junction board 28 is formed in the upper plate 70b in the vicinity of the second opening 76b.

  As shown in FIGS. 2 and 3, the upper plate 70b is provided with a first seal member 78a around the first opening 76a and the second opening 76b. The upper plate 70b is provided with a second seal member 78b that goes around the third opening 76c and a third seal member 78c that goes around the fourth opening 76d.

  As shown in FIG. 2, the upper plate 70b has a cover member 71 that contacts the first seal member 78a, the second seal member 78b, and the third seal member 78c and covers the first opening 76a to the fourth opening 76d. Is attached. The cover member 71 is provided with a fourth seal member 80a, a fifth seal member 80b, and a sixth seal member 80c that overlap the first seal member 78a, the second seal member 78b, and the third seal member 78c.

  As shown in FIGS. 5 and 6, the first wiring 44a is configured by surrounding a conductive member 82a with an insulating member 84a. The conductive member 82a is made of, for example, a copper bus bar, while the insulating member 84a is made of a resin case. One end portion of the conductive member 82a is provided with a connection portion 86a connected to the positive electrode terminal 38a1, and the other end portion of the conductive member 82a is provided with a connection member 88a connected to the relay device 26.

  The second wiring 44b is configured by surrounding the conductive member 82b with an insulating member 84b. The conductive member 82b is made of, for example, a copper bus bar, while the insulating member 84b is made of a resin case. One end portion of the conductive member 82b is provided with a connection portion 86b connected to the negative electrode terminal 38b1, and the other end portion of the conductive member 82b is provided with a connection member 88b connected to the relay device 26.

  As shown in FIG. 7, the first wiring 44 a and the second wiring 44 b are fixed to each other via a plurality of fastening members 90. The second wiring 44b is disposed on the lower plate 70a side, that is, on the lower side, and the first wiring 44a is disposed on the second wiring 44b.

  The insulating member 84a constituting the first wiring 44a has intersecting portions 92a, 92b, and 92c that straddle (intersect) the fourth seal member 80a. The insulating member 84a has intersections 92d and 92e that straddle the third seal member 78c and the sixth seal member 80c. The intersecting portions 92a, 92b, 92c and 92e have a wedge-shaped cross section in which the upper surface (the surface facing the cover member 71) is inclined downward. The intersecting portion 92d has a cross-sectional wedge shape whose lower surface is inclined upward (see FIGS. 5 and 6).

  As shown in FIG. 3, the insulating member 84b constituting the second wiring 44b includes intersecting portions 94a, 94b and 94c straddling (intersecting) the first seal member 78a, and intersecting portions 94d and straddling the third seal member 78c. 94e. The intersecting portions 94a to 94e have a cross-sectional wedge shape in which the lower surface (the surface facing the upper plate 70b) is inclined upward (see FIGS. 5 and 6).

  The operation of the electric vehicle 10 configured as described above will be described below.

  As shown in FIG. 4, the main switch 42 constituting the switch unit 41 is closed, so that power can be supplied from the battery module 34. The battery ECU 32 first turns on (closes) the precharge contactor 48 and the main contactor 46b. Therefore, the inverter device 24 is supplied with power whose current is limited by the precharge resistor 50.

  Subsequently, the precharge contactor 48 is turned off (opened) and the main contactor 46a is turned on (closed). As a result, the inverter device 24 is supplied with the output voltage converted by the downverter 62 and is rotated by the motor 12. Therefore, the electric vehicle 10 can run by the rotational drive of the motor 12.

  In this case, in the present embodiment, as shown in FIGS. 2 and 3, the upper plate 70b is formed with a first opening 76a through which the positive terminal 38a1 and the negative terminal 38b1 are inserted. The upper plate 70b is further formed with a second opening 76b and a third opening 76c through which the positive terminal 38a2 and the negative terminal 38b2 are inserted. A first seal member 78a that goes around the first opening 76a and the second opening 76b is provided, and a second seal member 78b that goes around the third opening 76c is provided.

  On the other hand, the cover member 71 is provided with a fourth seal member 80a and a fifth seal member 80b that overlap the first seal member 78a and the second seal member 78b. The cover member 71 substantially contacts the first seal member 78a and the second seal member 78b, and is attached to the upper plate 70b so as to cover the first opening 76a to the third opening 76c.

  For this reason, the power storage device 35 reliably suppresses high-frequency sound generated from the battery module 34 from leaking outside through the gap between the first opening 76a, the positive terminal 38a1, and the negative terminal 38b1 with a simple configuration. Can do. Similarly, the high-frequency sound generated from the battery module 34 is reliably suppressed from leaking to the outside through the gap between the second opening 76b and the positive terminal 38a2 and the gap between the third opening 76c and the negative terminal 38b2. It becomes possible.

  Therefore, in the power storage device 35, it is possible to prevent the occupant from being uncomfortable due to noise generated from the battery module 34 as much as possible.

  Furthermore, as shown in FIG. 2, FIG. 3 and FIG. 6, the insulating member 84a constituting the first wiring 44a is connected to the intersecting portions 92a, 92b and 92c straddling the fourth seal member 80a and the third seal member 78c. It has an intersecting portion 92d that straddles and an intersecting portion 92e that straddles the sixth seal member 80c. The intersecting portions 92a to 92e have a wedge shape in cross section.

  On the other hand, the insulating member 84b constituting the second wiring 44b has intersecting portions 94a, 94b and 94c straddling the first seal member 78a, and intersecting portions 94d and 94e straddling the third seal member 78c. At that time, the intersecting portions 94a to 94e have a wedge shape in cross section.

  Here, for example, as shown in FIG. 5, the intersecting portion 92c of the insulating member 84a and the intersecting portion 94c of the insulating member 84b overlap each other vertically and have a triangular cross-section as a whole. Accordingly, the fourth seal member 80a and the first seal member 78a can be smoothly deformed along the intersecting portions 92c and 94c, and no gap is formed between the intersecting portions 92c and 94c. . For this reason, it becomes possible to suppress more reliably that the high frequency sound from the battery module 34 leaks outside.

  FIG. 8 shows a first wiring 44a (ref.) And a second wiring 44b (ref.) As a comparative example. The intersection 92c (ref.) Of the first wiring 44a (ref.) Has a rectangular cross section. Similarly, the intersection 94c (ref.) Of the second wiring 44b (ref.) Has a rectangular cross section. Accordingly, when the intersecting portion 92c (ref.) And the intersecting portion 94c (ref.) Overlap each other, the intersecting portion 92c (ref.), The intersecting portion 94c (ref.), The fourth seal member 80a, and the first seal member 80a A gap S is formed between the seal member 78a and the seal member 78a. Thereby, the high frequency sound from the battery module 34 may leak to the outside through the gap S.

  In this embodiment, the inverter device 24, the relay device 26, the battery ECU 32, and the battery module 34 are arranged in this order toward the rear of the vehicle. However, the configuration may be reversed. That is, the battery module 34, the battery ECU 32, the relay device 26, and the inverter device 24 can be arranged in this order toward the rear of the vehicle.

DESCRIPTION OF SYMBOLS 10 ... Electric vehicle 12 ... Motor 18 ... Vehicle cabin 20L, 20R ... Front seat 22 ... Center console 24 ... Inverter device 26 ... Relay device 28 ... Junction board 30 ... Impact-resistant member 32 ... Battery ECU
34 ... Battery module 36 ... Storage battery 36M ... Storage battery block 38a1, 38a2 ... Positive terminal 38b1, 38b2 ... Negative terminal 40a, 40b, 44a, 44b ... Wiring 68 ... Casing 70b ... Upper plate 71 ... Cover member 72 ... Space for arrangement 74 ... Fans 76a to 76d ... openings 78a to 78c, 80a to 80c ... sealing members 82a and 82b ... conductive members 84a and 84b ... insulating members 92a to 92e, 94a to 94e ... intersections

Claims (3)

A storage battery block in which a plurality of storage batteries are stacked;
A holding member that holds the storage battery block and provides an opening through which a terminal of the storage battery block is inserted;
A seal member provided around the opening in the holding member;
A cover member attached to the holding member and contacting the seal member to cover the opening;
A power storage device comprising: The power storage device according to claim 1, wherein a conductive member surrounded by an insulating member is connected to the terminal.
The insulating member is provided with an intersecting portion straddling the seal member,
The power storage device, wherein the intersection has a wedge shape in cross section.   The power storage device according to claim 1, wherein the cover member is provided with another seal member that overlaps the seal member.

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