JP7189711B2 - automotive battery - Google Patents

Description

The present invention relates to a vehicle battery, and in particular, by arranging a control device connected to the battery module between two battery modules housed in a battery case, the size and weight of the battery can be reduced. In addition, the present invention relates to an in-vehicle battery that improves assembly workability and work safety.

Regarding a conventional battery pack 100, a structure shown in FIGS. 8A and 8B described below is known. FIG. 8A is an exploded perspective view illustrating a conventional battery pack 100. FIG. FIG. 8B is a cross-sectional view illustrating the internal structure of a conventional battery pack 100. FIG.

As shown in FIG. 8A, the battery pack 100 mainly includes a housing 101, battery modules 102, 103, and 104 arranged in the housing 101, a junction box 105, a relay circuit 106, 107 and . Each of the battery modules 102 to 104 is equipped with a monitoring ECU (Electronic Control Unit) for detecting and controlling its own state of charge. The junction box 105 is equipped with a battery control ECU (not shown) for monitoring and controlling the battery modules 102-104.

As illustrated, the housing 101 is composed of a housing main body 108 and a top plate portion 109 . Furthermore, the housing main body 108 is composed of a main body portion 110 and side plate portions 111 . Battery module 102 , junction box 105 and relay circuit 106 are fixed to main body 110 . Battery modules 103 and 104 and relay circuit 107 are fixed to side plate portion 111 .

As shown in FIG. 8B, connection terminals 102A, 103A, and 104A of battery modules 102, 103, and 104, connection terminal 105A of junction box 105, and connection terminals 106A and 107A of relay circuits 106 and 107 are connected to the housing. The connection terminals 102A to 107A are arranged facing the central portion inside 101, and the respective connection terminals 102A to 107A face each other. The connection terminals 102A to 107A are electrically connected by a harness 112 as appropriate. With this structure, the battery modules 102 to 104, etc. are monitored and controlled by the battery control ECU in the junction box 105 (see, for example, Patent Document 1).

JP 2017-76506 A

As described above, in the battery pack 100, the housing 101 is divided into the top plate portion 109, the main body portion 110, and the side plate portions 111, thereby facilitating the assembly work of the battery modules 102 to 104 and the like. there is

However, the battery module 102, the junction box 105, and the relay circuit 106 are individually assembled to the main body portion 110, respectively. Similarly, the battery modules 103 and 104 and the relay circuit 107 are individually assembled to the side plate portion 111 . After that, inside the housing 101, the connection terminals 102A to 107A are electrically connected by harnesses 112 as appropriate. In other words, it is necessary to secure a working space for wiring the harness 112 inside the housing 101 , which poses a problem that it is difficult to reduce the size of the housing 101 . In addition, since each component such as the battery modules 102 to 104 is individually assembled to the housing 101, there is a problem that work efficiency is poor.

Also, in a narrow work space in the housing 101, during the work of connecting the harness 112 to the connection terminals 102A to 107A, a worker's hand may come into contact with the connection terminals 102A to 107A, electrodes, or the like, causing an electric shock. There is a problem that it is difficult to ensure work safety, for example, there is a risk of

In addition, since the connection terminals 102A to 107A of the battery modules 102 to 104 and the like are arranged facing each other inside the housing 101, the housing 101 is also deformed when the vehicle is hit from the side. There is a problem that the connection terminals 102A to 107A may come into contact with each other and spark may occur.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. The present invention relates to an in-vehicle battery that achieves weight reduction and improves assembly workability and work safety.

In the vehicle battery of the present invention, at least a first battery module, a second battery module, and a control device for controlling the first battery module and the second battery module are housed in the battery case. WHEREIN: The 1st main surface in which the electrode terminal of a said 1st battery module is formed is arrange|positioned facing the 1st main surface in which the electrode terminal of a said 2nd battery module is formed. wherein the control device is disposed between the first main surface of the first battery module and the first main surface of the second battery module, further comprising a fixing bracket electrically connected to the module and the second battery module and fixing the first battery module, the second battery module and the control device, wherein the fixing bracket is attached to the battery case; characterized in that it is fixed to

Further, in the vehicle-mounted battery of the present invention, the first main surface of the first battery module and the first main surface of the second battery module are provided with battery-side connectors for connecting to the control device, respectively. A first main surface of the control device and a second main surface opposite to the first main surface are provided with the first battery module or the second battery module, respectively. A control-side connector portion for connection is formed, and the first battery module, the second battery module, and the control device are electrically connected via the battery-side connector portion and the control-side connector portion. It is characterized by

Further, in the vehicle battery of the present invention, a junction box is further accommodated in the battery case, and the junction box is located on the opposite side of the first main surface of the first battery module. It is fixed to the fixing bracket positioned on the main surface side or on the second main surface side opposite to the first main surface of the second battery module.

Further, in the automotive battery of the present invention, the junction box is provided with a relay, and the fixing bracket is mounted on the second main surface of the first battery module or the second main surface of the second battery module. 2, extending from the vicinity of the end portion of the main surface of the junction box facing the main surface of the junction box to the vicinity of the arrangement area of the relay.

Further, in the vehicle-mounted battery of the present invention, the bottom surface of the battery case has at least three rows of reinforcing projections extending in one direction, and the reinforcing projections are formed between the reinforcing projections and extend in the one direction. A first cooling air passage and a second cooling air passage are formed, and the first cooling air passage is arranged below the first battery module along the one direction. and the second cooling air passage is arranged below the second battery module along the one direction.

Further, in the vehicle-mounted battery of the present invention, the reinforcing protrusion located in the center of the bottom surface of the battery case is formed wider than the reinforcing protrusions located on both sides thereof, and the reinforcing protrusion located in the center The first battery module on the first main surface side, the control device, and the second battery module on the first main surface side are arranged on the upper surface of the reinforcing protrusion. Characterized by

Further, in the automotive battery of the present invention, the first main surface extending in the one direction is provided between the first main surface of the first battery module and the first main surface of the control device. A smoke exhaust air passage is provided, and the second airway extending in the one direction is provided between the first main surface of the second battery module and the second main surface of the control device. It is characterized in that an air passage for exhausting smoke is provided.

Further, in the vehicle-mounted battery of the present invention, a reinforcing member is disposed above the control device to bridge the side surfaces of the battery case along the one direction.

In the vehicle battery of the present invention, the first main surface on which the electrode terminals of the first battery module are formed is the same as the first main surface on which the electrode terminals of the second battery module are formed in the battery case. They are arranged facing each other. The control device is disposed between the first main surface of the first battery module and the first main surface of the second battery module, and controls the first battery module and the second battery module. is electrically connected to With this structure, the wiring distance between the first and second battery modules and the control device is shortened, the length of the electrical wiring is shortened, the resistance to noise is increased, and the risk of short circuit or the like is reduced. Also, when the vehicle is hit from the side and the battery case 12 is also deformed, the electrode terminals of the first battery module and the electrode terminals of the second battery module do not come into direct contact with each other, so sparks are not generated. is prevented.

Further, in the vehicle battery of the present invention, the first battery module and the second battery module each have a battery-side connector portion that connects to the control device, and the control device includes the first battery module or the second battery module, respectively. A control-side connector portion that connects with the second battery module is formed. The first battery module and the second battery module are electrically connected to the control device via the battery-side connector portion and the control-side connector portion. With this structure, the weight of the vehicle battery can be reduced, and the assembly work of the vehicle battery can be simplified.

Further, the vehicle battery of the present invention has a fixing bracket for fixing the first battery module, the second battery module and the control device, and the fixing bracket is fixed to the battery case. With this structure, an operator can attach the first battery module and the like to the fixing bracket outside the battery case, and then fix the fixing bracket to the battery case. In addition, the battery case only needs to have a minimum required work space, and the size of the vehicle battery can be reduced.

Further, in the vehicle battery of the present invention, the junction box is provided with a relay. A fixed bracket extending from the vicinity of the end to the vicinity of the relay is arranged on the main surface of the junction box. With this structure, the fixed bracket also functions as a heat sink, allowing heat generated from the relay to be dissipated through the battery case.

Further, in the vehicle battery of the present invention, the junction box is fixed to the fixing bracket located on the side of the first battery module or the side of the second battery module. With this structure, after the junction box is also integrally attached to the fixing bracket, the fixing bracket can be fixed to the battery case.

In addition, in the vehicle battery of the present invention, the bottom surface of the battery case has at least three rows of reinforcing projections extending in one direction, and the first row extending in one direction formed between the reinforcing projections and extending in one direction. A first cooling air passage and a second cooling air passage are formed. The first cooling air passage is provided below the first battery module along one direction, and the second cooling air passage is provided below the second battery module along one direction. are arranged. With this structure, the cooling air sent into the battery case flows through the first and second cooling air passages into the space between the battery cells in the first and second battery modules, and reaches the top of the battery case. blow through. Further, in each battery cell, the contact area with the cooling air is increased, thereby improving the cooling efficiency of the first and second battery modules.

In addition, in the vehicle battery of the present invention, the reinforcing protrusion located in the center of the bottom surface of the battery case is formed wider than the reinforcing protrusions located on both sides thereof. A first battery module, a control device, and a second battery module are arranged on the upper surface of the reinforcing projection located in the center. With this structure, the central portion of the battery case is reliably reinforced, and the regions where the electrode terminals of the first and second battery modules, which are most vulnerable to short circuits, are arranged can be firmly supported from below.

Further, in the vehicle battery of the present invention, the first smoke exhaust air passage is provided between the first battery module and the control device, and the second smoke exhaust passage is provided between the second battery module and the control device. 2 air passages for exhausting smoke are provided. With this structure, when toxic gas is generated when the battery cell is abnormal, the toxic gas is reliably discharged to the outside space of the vehicle through the first and second smoke exhaust air passages.

Further, in the vehicle battery of the present invention, a reinforcing member that bridges the side surfaces of the battery case is arranged above the control device. With this structure, in the battery case, a reinforcing projection is arranged on the bottom surface side, and a reinforcing member is arranged in the upper opening, so that the mechanical strength of the battery case in the longitudinal direction of the vehicle is greatly increased. improves.

1 is a schematic diagram illustrating a vehicle equipped with an in-vehicle battery that is an embodiment of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is a perspective view explaining the vehicle-mounted battery which is one Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is (A) perspective view, (B) side view explaining the vehicle battery which is one Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is (A) perspective view, (B) perspective view explaining the vehicle battery which is one Embodiment of this invention. 1 is a cross-sectional view illustrating a battery case of a vehicle-mounted battery that is an embodiment of the present invention; FIG. It is (A) a top view explaining the modification of the vehicle battery which is one Embodiment of this invention, and (B) sectional drawing. FIG. 4 is a top view illustrating a modification of the vehicle-mounted battery that is one embodiment of the present invention; It is (A) an exploded perspective view and (B) sectional view explaining the conventional battery pack.

DETAILED DESCRIPTION OF THE INVENTION A vehicle-mounted battery according to an embodiment of the present invention will be described in detail below with reference to the drawings. In the description of the present embodiment, in principle, the same reference numbers are used for the same members, and repeated descriptions are omitted.

First, FIG. 1 is a schematic diagram illustrating a vehicle 11 equipped with a vehicle battery 10 of this embodiment. FIG. 2 is a perspective view illustrating the vehicle-mounted battery 10 of this embodiment. FIG. 3(A) is a perspective view illustrating a state in which the first and second battery modules 13, 14, etc. arranged in the vehicle-mounted battery 10 of this embodiment are integrally assembled. FIG. 3(B) is a side view for explaining how the first and second battery modules 13, 14, etc. shown in FIG. 3(A) are assembled together. FIG. 4A is a perspective view illustrating the fixing bracket 21 of the vehicle battery 10 of this embodiment. FIG. 4B is a perspective view illustrating the positional relationship between the junction box 16 and the fixing bracket 21 of the vehicle battery 10 of this embodiment.

A vehicle 11 such as an automobile or a train is equipped with an in-vehicle battery 10 for supplying electric power to a motor and various electrical components. In the case of automobiles as the vehicle 11, in recent years, EV (Electrical Vehicle), HEV (Hybrid Electrical Vehicle), PHEV (Plug-in Hybrid Electrical Vehicle), etc. have become popular, and these vehicles 11 also have a high power storage function. A vehicle-mounted battery 10 having a is mounted.

As shown in FIG. 1, the vehicle-mounted battery 10 is arranged, for example, in a storage space 11A below the rear floor of the vehicle 11, and the longitudinal direction of the vehicle-mounted battery 10 is aligned with the front-rear direction of the vehicle 11. are placed in The vehicle battery 10 is not limited to being arranged under the rear floor, and may be arranged under the front floor or the like where the driver's seat and the passenger's seat of the vehicle 11 are arranged. .

As shown in FIG. 2, the vehicle battery 10 mainly includes a battery case 12, a first battery module 13, a second battery module 14, a BCU (Battery Control Unit) 15, a junction box 16, It has an electrical wiring 17 and a fixing bracket 21 (see FIG. 3A).

The battery case 12 is formed by forming a steel plate of iron, aluminum, or the like, or a synthetic resin plate into a substantially box shape, and has a shape with an open top. The battery case 12 has a storage area 12A in which the first battery module 13 and the like are stored. ing. The first battery module 13 and the second battery module 14 are arranged in the storage area 12A of the battery case 12 facing each other so that their longitudinal directions match the longitudinal direction of the battery case 12. is set.

As shown in the figure, a cooling duct 18 is provided on the rear side surface 12B of the battery case 12, and the cooling duct 18 is a duct made of insulating resin such as polyethylene or polypropylene. The cooling duct 18 flows cooling air that has been air-conditioned by a vehicle air conditioner (not shown), and also feeds the cooling air into the storage area 12A of the battery case 12 to cool the first and second batteries. Cool the modules 13,14.

The first battery module 13 is constructed by connecting a plurality of battery cells 19 in series within its storage case. The battery cell 19 is, for example, a secondary battery such as a nickel-metal hydride battery or a lithium-ion battery. Each battery cell 19 has, for example, a rectangular flat plate shape, and is arranged at equal intervals along the front-rear direction of the vehicle 11 with small gaps in front and rear of the battery cells 19 . The second battery module 14 also has the same structure as the first battery module 13 .

The BCU 15 is an electronic control device that is covered by a substantially box-shaped case made of metal or resin and performs monitoring and control of each battery cell 19 in the first and second battery modules 13 and 14 . As shown, the BCU 15 is disposed between the first battery module 13 and the second battery module 14 and is electrically connected to the first and second battery modules 13 , 14 via electrical wiring 17 . Connected. When the BCU 15 is covered with a metal case, the surface of the BCU 15 may be insulated with an insulating sheet or the like. In this case, sparks between the first and second battery modules 13 and 14 can be prevented more reliably.

The junction box 16 incorporates components such as a relay 23 (see FIG. 4B) and fuses to form an electronic circuit, and is electrically connected to the BCU 15 and the like via electrical wiring 17 . As illustrated, the junction box 16 is arranged on the side of the first battery module 13 .

As shown in FIG. 3A, the first battery module 13, the second battery module 14, the BCU 15 and the junction box 16 are integrally assembled using a fixing bracket 21. As shown in FIG. Then, the fixing bracket 21 to which the first battery module 13 and the like are assembled is housed in the storage area 12A (see FIG. 2) of the battery case 12 (see FIG. 2), and the fixing bracket 21 and the battery case 12 are bolted together. By fastening, the first battery module 13 and the like are also fixed to the battery case 12 .

That is, the operator assembles the first battery module 13 and the like to the fixing bracket 21 outside the battery case 12, electrically connects them via the electrical wiring 17, and then attaches the fixing bracket 21 to the battery case. 12 can be fixed. With this structure, the battery case 12 only needs to have a minimum working space, and the size of the vehicle battery 10 can be reduced. In addition, work for individually assembling each part such as the first battery module 13 in the narrow storage area 12A of the battery case 12 is not required, thereby improving work efficiency. Furthermore, since the worker does not need to perform the wire connection work in the narrow storage area 12A of the battery case 12, the worker's hand does not come into contact with the electrode terminals 13B, 14B (see FIG. 3B), etc. during the work. This eliminates the risk of electric shock and improves work safety.

Specifically, as shown in FIGS. 3A and 3B, the first main surface 13A of the first battery module 13 has a large number of electrode terminals 13B for electrical connection with the BCU 15 and the like. formed. Similarly, the first main surface 14A of the second battery module 14 is also formed with a large number of electrode terminals 14B for electrical connection with the BCU 15 and the like. Plate-shaped fixing plates 22 are attached to both ends of the first and second battery modules 13 and 14 in the longitudinal direction (the front-rear direction of the vehicle 11). The first and second battery modules 13 and 14 are fixed to the fixing bracket 21 by bolting the fixing bracket 21 and the fixing plate 22 together.

Also, the first and second battery modules 13 and 14 are fixed so that the first main surfaces 13A and 14A of each other face each other. The BCU 15 is located between the first battery module 13 and the second battery module 14, and its first main surface 15A faces the first main surface 13A of the first battery module 13. Second main surface 15B is fixed to fixing bracket 21 by bolting so as to face first main surface 14A of second battery module 14 .

Also, the junction box 16 is fixed to the fixing bracket 21 by bolting on the second main surface 13</b>C side of the first battery module 13 . The junction box 16 may be fixed to the fixing bracket 21 by bolting on the second main surface 14C side of the second battery module 14 .

With this structure, when the vehicle 11 is collided from the side and the battery case 12 is also deformed by the impact, the electrode terminals 13B of the first battery module 13 and the electrode terminals 14B of the second battery module 14 are brought into direct contact with each other. This prevents sparks from occurring. And the safety of the vehicle-mounted battery 10 is improved.

In addition, since the BCU 15 is arranged between the first battery module 13 and the second battery module 14 , the first battery module 13 and the second battery module 14 are blocked by the BCU 15 . ing. With this structure, although heat is generated from the first and second battery modules 13 and 14, the generated heat is prevented from adversely affecting each other, such as malfunction.

Moreover, the wiring distance between the BCU 15 and the first and second battery modules 13 and 14 is shortened by arranging the BCU 15 between the first battery module 13 and the second battery module 14 . With this structure, the electric wiring 17 can be shortened, the electric wiring 17 can be made more resistant to noise, the risk of a short circuit or the like can be reduced, and the weight of the vehicle battery 10 can be reduced.

As shown in FIG. 4A, the fixed bracket 21 is formed of, for example, a pair of substantially L-shaped metal plates, and is also used as a heat dissipation member. Specifically, as shown in FIG. 4B, an extension region 21A of the fixing bracket 21 extending in the front-rear direction of the vehicle 11 is arranged along the main surface 16A of the junction box 16, and extends along the main surface 16A. are arranged from the vicinity of the end portion toward the central portion. A relay 23 is electrically connected to the central portion of the junction box 16 , and the extension region 21 A of the fixing bracket 21 is arranged in the vicinity of the relay 23 .

With this structure, the heat generated from the relay 23 is transmitted to the extension region 21A of the fixing bracket 21 and radiated to the outside of the battery case 12 through the battery case 12 (see FIG. 2). As shown in FIG. 3(A), the junction box 16 is arranged near the side of the first battery module 13, and the heat generated from the relay 23 causes the battery cells 19 of the first battery module 13 to be damaged. is prevented from reaching a high temperature state. For convenience of explanation, the first battery module 13 is omitted in FIG. 4B.

Next, FIG. 5 is a cross-sectional view for explaining the battery case 12 of the vehicle-mounted battery 10 of this embodiment, and is a cross-sectional view of the vehicle-mounted battery 10 shown in FIG. 2 taken along line AA.

As shown in FIG. 5, on the bottom surface 12C of the battery case 12, three rows of beads 31, 32, and 33, which are reinforcing protrusions extending in the longitudinal direction of the vehicle 11, are arranged. It is formed of a steel plate such as aluminum or a synthetic resin plate. The beads 31, 33 are arranged at positions supporting the second main surfaces 13C, 14C of the first and second battery modules 13, 14 from below. On the other hand, the beads 32 are arranged at positions supporting the first main surfaces 13A, 14A of the first and second battery modules 13, 14 and the BCU 15 from below.

The bead 32 is formed between the beads 31 and 33 and is wider than the beads 31 and 33 in the central portion of the battery case 12, so that the central portion of the battery case 12 is reliably reinforced and is most resistant to short circuits. The regions where the electrode terminals 13B, 14B of the weak first and second battery modules 13, 14 are arranged can be firmly supported from below.

Furthermore, on the bottom surface 12C of the battery case 12, a first cooling air passage 34 is arranged between the beads 31 and 32, a second cooling air passage 35 is arranged between the beads 32 and 33, The first and second cooling air passages 34, 35 communicate with the cooling duct 18 (see FIG. 2). The first and second cooling air passages 34 and 35 are formed of, for example, a steel plate such as iron or aluminum or a synthetic resin plate, extend in the front-rear direction of the vehicle 11, and are open on the upper surface side. The first battery module 13 is arranged above the first cooling air passage 34, and the second battery module 14 is arranged above the second cooling air passage 35. there is

With this structure, as indicated by dashed arrows 36 and 37, the cooling air sent from the cooling duct 18 into the battery case 12 passes through the first and second cooling air passages 34 and 35 to the second direction. It flows into small gaps between the battery cells 19 (see FIG. 2) in the first and second battery modules 13 and 14 and blows through the battery case 12 upward. In each battery cell 19, the cooling efficiency of the first and second battery modules 13 and 14 is improved by increasing the contact area with the cooling air.

Next, FIG. 6(A) is a modification of the vehicle-mounted battery 10 (see FIG. 2) of this embodiment, and is a top view for explaining the vehicle-mounted battery 40. As shown in FIG. FIG. 6B is a cross-sectional view of vehicle battery 40 taken along line BB of FIG. 6A.

The vehicle battery 40 differs from the vehicle battery 10 described above in that smoke exhaust air passage members 41 and 42 and a reinforcing member 43 are newly added. It is the same as the battery 10 for Therefore, in the following description, the smoke exhaust air passage members 41 and 42 and the reinforcing member 43 will be mainly described. are omitted. Also, the cooling duct 18 is omitted in the drawing.

As shown in FIG. 6A, a reinforcing member 43 for reinforcing the battery case 12 is formed on the upper surface of the BCU 15. As shown in FIG. The reinforcing member 43 may be resin-molded integrally with the package of the BCU 15, or may be formed from a rectangular steel pipe. The reinforcing member 43 is arranged to bridge the side surfaces 12B and 12D of the battery case 12 in the front-rear direction of the vehicle 11 . Further, as shown in FIG. 6(B), the cross-sectional shape of the reinforcing member 43 is substantially rectangular, thereby increasing the mechanical strength. As described above, in the battery case 12, three rows of beads 31 to 33 (see FIG. 5B) are arranged on the bottom surface 12C side thereof, and the reinforcing member 43 is arranged in the upper opening thereof. ing. This structure significantly improves the mechanical strength of the battery case 12 in the front-rear direction of the vehicle 11 .

As shown in FIG. 6B, first and second smoke exhaust air passage members 41 and 42 are arranged between the BCU 15 and the first and second battery modules 13 and 14, respectively. . The first and second smoke exhaust air passage members 41 and 42 are substantially rectangular parallelepipeds made of an insulating resin such as polyethylene and polypropylene, and at least one main surface 41A and 42A thereof are in contact with the first main surfaces 13A, 14A of the battery modules 13, 14 of the . At the center of the first and second smoke exhaust air passage members 41 and 42, the first and second battery modules 13 and 14 are provided along the longitudinal direction of the first and second smoke exhaust air passage members 41 and 42, respectively. Air passages 41B and 42B are formed.

Here, on the upper surface of the battery cell 19, a gas discharge valve (not shown) is formed in the central region between the positive terminal (not shown) and the negative terminal (not shown). there is The gas exhaust valve is formed, for example, by using a thin portion or the like on the upper surface of the battery cell 19, and has a structure that preferentially ruptures when the internal pressure increases due to the generation of toxic gas when the battery cell 19 malfunctions. The first and second smoke exhaust air paths 41B and 42B are formed so that the inside of the battery cell 19 communicates with the first and second smoke exhaust air paths 41B and 42B through the fractured area of the battery cell 19. The members 41, 42 are arranged between the BCU 15 and the first and second battery modules 13, 14, respectively. Although not shown, the ends of the first and second smoke exhaust air passages 41B and 42B on one end side (the front side of the vehicle 11) are closed. The ends of the smoke air passages 41B and 42B on the other end side (rear side of the vehicle 11) communicate with a smoke exhaust duct (not shown).

With this structure, when toxic gas is generated when the battery cell 19 is abnormal, the toxic gas is reliably discharged to the outside space of the vehicle through the first and second smoke exhaust air passages 41B and 42B and the smoke exhaust duct. and discharged.

Next, FIG. 7 is a top view illustrating a vehicle-mounted battery 50, which is a modification of the vehicle-mounted battery 10 (see FIG. 2) of the present embodiment. Note that the vehicle-mounted battery 50 has battery-side connector portions 51 and 52 instead of the electric wiring 17 in the connection structure between the first and second battery modules 13 and 14 and the BCU 15 in contrast to the vehicle-mounted battery 10 described above. And the structure provided with the control-side connector portions 53 and 54 is different, and the other structural members are the same as those of the vehicle-mounted battery 10 . Therefore, in the following description, the battery-side connector portions 51 and 52 and the control-side connector portions 53 and 54 will be mainly described. Description is omitted. Also, the cooling duct 18 is omitted in the drawing.

As shown in FIG. 7, BCU 15 is arranged between first battery module 13 and second battery module 14 . A battery-side connector portion 51 is formed on the first main surface 13A of the first battery module 13 . The battery-side connector portion 51 is electrically connected to electrode terminals and the like of each battery cell 19 via a printed circuit board, for example. Similarly, a battery-side connector portion 52 is formed on the first main surface 14A of the second battery module 14 . The battery-side connector portion 52 is electrically connected to the electrode terminals and the like of each battery cell 19 via a printed circuit board, for example.

On the other hand, on the first main surface 15A of the BCU 15, a control-side connector portion 53 is formed at a position where it can be connected to the battery-side connector portion 51. As shown in FIG. Similarly, a control-side connector portion 54 is formed on the second main surface 15B of the BCU 15 at a position where it can be connected to the battery-side connector portion 51 . With this structure, the BCU 15 and the first and second battery modules 13 and 14 can be electrically connected via the battery side connector portions 51 and 52 and the control side connector portions 53 and 54 . As a result, the electric wiring 17 that connects the BCU 15 and the first and second battery modules 13, 14 is not required, and the weight of the vehicle battery 10 is reduced, and the work efficiency is improved because the wiring work is unnecessary.

Incidentally, in this embodiment, the case where one set of the first and second battery modules 13, 14, etc. assembled integrally via the fixing bracket 21 is arranged in the battery case 12 has been described. is not limited to For example, two sets of the first and second battery modules 13 and 14 fixed to the fixing bracket 21 may be arranged in the battery case 12 . Even in this case, as described above, by assembling the first battery module 13 and the like to the fixing bracket 21 outside the battery case 12, work efficiency is improved and the size of the vehicle battery 10 is reduced. and weight reduction. In addition, various modifications are possible without departing from the gist of the present invention.

Reference Signs List 10, 40, 50 vehicle battery 11 vehicle 12 battery case 13 first battery module 13A first main surface 13B electrode terminal 13C second main surface 14 second battery module 14A first main surface 14B electrode terminal 14C Second main surface 15 BCU
15A first main surface 15B second main surface 16 junction box 17 electrical wiring 18 cooling duct 19 battery cell 21 fixing bracket 31, 32, 33 bead 34 first cooling air passage 35 second cooling air passage 41 First smoke exhaust air passage member 42 Second smoke exhaust air passage member 41B First smoke exhaust air passage 42B Second smoke exhaust air passage 43 Reinforcing member 51, 52 Battery side connector portion 53, 54 control side connector

Claims (8)

An in-vehicle battery in which at least a first battery module, a second battery module, and a control device for controlling the first battery module and the second battery module are housed in a battery case,
the first main surface on which the electrode terminals of the first battery module are formed is arranged to face the first main surface on which the electrode terminals of the second battery module are formed;
The control device is disposed between the first main surface of the first battery module and the first main surface of the second battery module, and controls the first battery module and the first battery module. electrically connected to the second battery module ;
further comprising a fixing bracket for fixing the first battery module, the second battery module and the control device;
An in-vehicle battery , wherein the fixing bracket is fixed to the battery case . The first main surface of the first battery module and the first main surface of the second battery module are formed with battery-side connector portions that connect to the control device, respectively;
Control-side connectors for connecting to the first battery module or the second battery module, respectively, are provided on the first main surface of the control device and on the second main surface located on the opposite side of the first main surface. part is formed,
2. The apparatus according to claim 1, wherein the first battery module and the second battery module and the control device are electrically connected via the battery-side connector section and the control-side connector section. Automotive battery as described. A junction box is further accommodated in the battery case,
The junction box is located on the side of the second main surface opposite to the first main surface of the first battery module or on the side opposite to the first main surface of the second battery module. 3. The vehicle-mounted battery according to claim 1 , wherein the battery is fixed to the fixing bracket positioned on the second main surface side. A relay is disposed in the junction box,
The fixing bracket extends from near the end of the main surface of the junction box facing the second main surface of the first battery module or the second main surface of the second battery module to the relay. 4. The vehicle-mounted battery according to claim 3 , wherein the battery is arranged to extend to the vicinity of the installation area. On the bottom surface of the battery case,
at least three rows of reinforcing protrusions extending in one direction;
a first cooling air passage and a second cooling air passage formed between the reinforcing protrusions and extending in the one direction;
The first cooling air passage is arranged below the first battery module along the one direction, and the second cooling air passage is arranged along the one direction to the second battery module. 3. The vehicle battery according to claim 2 , wherein the battery is arranged below the module. The reinforcing protrusion located in the center of the bottom surface of the battery case is formed wider than the reinforcing protrusions located on both sides thereof,
The first battery module on the first main surface side, the control device, and the second battery module on the first main surface side are arranged on the upper surface of the reinforcing protrusion located in the center. 6. The vehicle-mounted battery according to claim 5 , wherein: a first smoke exhaust air passage extending in the one direction is provided between the first main surface of the first battery module and the first main surface of the control device;
A second smoke exhaust air passage extending in the one direction is provided between the first main surface of the second battery module and the second main surface of the control device. 7. The vehicle-mounted battery according to claim 5 or 6 , characterized in that: 8. The apparatus according to any one of claims 5 to 7, wherein a reinforcing member is provided above the control device to bridge the side surfaces of the battery case along the one direction. Automotive battery as described.

Images