JP2019008876A - Bus bar unit and conductive module - Google Patents

Abstract

To suppress rising cost.SOLUTION: A bus bar unit includes a main bus bar member 20A molded of a first conductive material, and a sub-bus bar member 30A molded of a second conductive material separately from the main bus bar member, and connected physically and electrically with the main bus bar member by assembling thereto. The main bus bar member is molded into such a shape that it can be placed while straddling two adjoining electrode terminals of a battery module 110 where multiple electrode cells 120 having positive and negative electrode terminals 122, respectively, are arranged, and when welding to a first electrode terminal 122A composed of the first conductive material, out of the adjoining two electrode terminals, it is connected physically and electrically with the first electrode terminal. The sub-bus bar member is interposed between the second electrode terminal 122B composed of the second conductive material, out of the adjoining two electrode terminals, and the main bus bar member, and connecting the main bus bar member and the second electrode terminal electrically by being welded to the second electrode terminal.SELECTED DRAWING: Figure 3

Description

  The present invention relates to a bus bar unit and a conductive module.

  2. Description of the Related Art Conventionally, vehicles such as electric vehicles and hybrid vehicles are equipped with a battery pack that supplies power to a rotating machine that is a driving source. The battery pack includes a battery module in which a plurality of battery cells having positive and negative electrode terminals are arranged, and a conductive module that is electrically connected to at least one electrode terminal of the battery module. It has been. The conductive module includes a conductive bus bar member electrically connected to the electrode terminal, an electric wire electrically connected to the bus bar member and the electrical connection object side, the bus bar member, A housing member for housing the electric wire. This type of conductive module is disclosed in Patent Document 1 below.

JP2015-88426A

  By the way, in a battery module, two electrode terminals adjacent in the arrangement direction of a plurality of battery cells may be formed of different materials. Therefore, the bus bar member is formed of the first conductive material formed of the first conductive material forming one electrode terminal and the second conductive material forming the other electrode terminal in order to be welded to the respective electrode terminals. And the second conductor made. For example, as the bus bar member, a member in which a first conductor and a second conductor are clad can be used. However, the bus bar member made of the clad material may cause an increase in cost as compared with one formed of a single conductive material such as aluminum or copper.

  Therefore, an object of the present invention is to provide a bus bar unit and a conductive module that can suppress an increase in cost.

  In order to achieve the above object, a bus bar unit according to the present invention is molded as a separate body from the main bus bar member formed of the first conductive material and the main bus bar member formed of the second conductive material, A sub-bus bar member that is physically and electrically connected to the main bus bar member by being assembled to the main bus bar member, and the main bus bar member has a plurality of battery cells each having positive and negative electrode terminals. By forming into a shape that can be arranged across two adjacent electrode terminals of the arranged battery modules, and welding to the first electrode terminal made of the first conductive material of the two adjacent electrode terminals. The sub-bus bar member includes a second electrode terminal made of the second conductive material of the two adjacent electrode terminals and the main bus bar. With parts Interposed, said by welding to the second electrode terminal, it is characterized in that to electrically connect the second electrode terminal and the main bus bar members.

  Here, it is preferable that the main bus bar member has a fitted portion into which the sub bus bar member is fitted.

  The first conductive material is preferably a material having a specific gravity smaller than that of the second conductive material.

  The first conductive material is preferably a material having higher conductivity than the second conductive material.

  In order to achieve the above object, a conductive module according to the present invention includes a bus bar unit for electrically connecting two adjacent electrode terminals of a battery module in which a plurality of battery cells each having positive and negative electrode terminals are arranged. An electric wire that extends in the arrangement direction of the plurality of battery cells and electrically connects the bus bar unit and the electrical connection object, and a housing member that accommodates the bus bar unit and the electric wire, The bus bar unit is formed as a separate body from the main bus bar member formed from the first conductive material and the main bus bar member from the second conductive material, and is assembled to the main bus bar member, thereby A sub-bus bar member physically and electrically connected to the member, and the main bus bar member has a shape that can be disposed across two adjacent electrode terminals. Forming and welding to the first electrode terminal made of the first conductive material of the two adjacent electrode terminals, thereby making a physical and electrical connection to the first electrode terminal. The bus bar member is interposed between the second electrode terminal made of the second conductive material of the two adjacent electrode terminals and the main bus bar member, and welded to the second electrode terminal, The main bus bar member and the second electrode terminal are electrically connected.

  The bus bar unit according to the present invention includes a main bus bar member formed of the same type of first conductive material in accordance with the first electrode terminal, and a sub bus formed of the same type of second conductive material in accordance with the second electrode terminal. A bus bar member. In this bus bar unit, the main bus bar member and the sub bus bar member, which are prepared as separate parts, are assembled to each other so that they are physically and electrically connected to each other. Therefore, the bus bar unit according to the present invention can be formed at a low cost because it can suppress an increase in cost as compared with a bus bar unit formed using a clad material. The conductive module according to the present invention includes the bus bar unit, and the same effects as the bus bar unit can be obtained.

FIG. 1 is a perspective view showing a bus bar unit and a conductive module, and shows a state of being attached to a battery module. FIG. 2 is a perspective view showing the bus bar unit and the conductive module together with the battery module. FIG. 3 is a perspective view showing the bus bar unit of the embodiment. FIG. 4 is a plan view showing the bus bar unit of the embodiment. FIG. 5 is a diagram of the bus bar unit according to the embodiment as viewed in the direction of arrow A in FIG. 4. 6 is a cross-sectional view taken along lines X1-X1 and X2-X2 in FIG. FIG. 7 is a perspective view of the housing member. FIG. 8 is a perspective view showing the bus bar unit of the first modification. FIG. 9 is a plan view showing the bus bar unit of the first modification. 10 is a cross-sectional view taken along lines X3-X3 and X4-X4 in FIG. FIG. 11 is a plan view showing a bus bar unit according to the second modification. 12 is a cross-sectional view taken along lines X5-X5 and X6-X6 in FIG.

  Hereinafter, embodiments of a bus bar unit and a conductive module according to the present invention will be described in detail with reference to the drawings. In addition, this invention is not limited by this embodiment.

  The bus bar unit and the conductive module according to the present invention will be described below.

  Reference numeral 1 in FIGS. 1 and 2 denotes a conductive module. Moreover, the code | symbol 10 of FIG.1 and FIG.2 shows a bus bar unit. The conductive module 1 is electrically connected to at least one of the plurality of battery cells 120 forming the battery module 110, and forms the battery pack 100 together with the battery module 110. The battery pack 100 is mounted on a vehicle (such as an electric vehicle or a hybrid vehicle) provided with a rotating machine as a drive source, and is used for power supply to the rotating machine. First, the connection object of this conductive module 1 will be described.

  The battery cell 120 includes a cell body 121 and two electrode terminals 122 (FIG. 2). Each electrode terminal 122 is provided at any location of the cell body 121 in a state of being exposed to the outside, and one is a positive electrode and the other is a negative electrode. Each electrode terminal 122 is, for example, a plate-like one provided on the outer wall surface of the cell body 121. In the battery cell 120, when the cell body 121 has a plurality of outer wall surfaces, each electrode terminal 122 may be arranged on one outer wall surface, and the outer wall surface on which the electrode terminal 122 is arranged is provided for each electrode terminal 122. It may be divided. In the battery module 110, either one of the electrode terminals 122 of each battery cell 120 is arranged in a row, and the other electrode terminals 122 are also arranged in a row, and the battery cells 120 are arranged in a row. Yes. For this reason, in this battery module 110, the electrode terminal group 125 which consists of the electrode terminal 122 arranged in a line is provided in two places.

  In the battery module 110, two electrode terminals 122 adjacent in the arrangement direction of the battery cells 120 are electrically connected to each electrode terminal group 125. The bus bar unit 10 described in detail later is for electrically connecting the two electrode terminals 122. Further, in all the electrode terminals 122 of the battery module 110, there are two that are not electrically connected to the other electrode terminals 122. One of the two independent electrode terminals 122 is a so-called total positive electrode, and the other is a so-called total negative electrode. The conductive module 1 includes a bus bar 10P electrically connected to the electrode terminal 122 as its total positive electrode, and a bus bar 10M electrically connected to the electrode terminal 122 as its total negative electrode. (FIGS. 1 and 2).

  For example, in the battery cell 120 illustrated here, the cell body 121 forms a rectangular parallelepiped. Therefore, this exemplary battery module 110 virtually forms a rectangular parallelepiped by an assembly of a plurality of battery cells 120 arranged, and has six wall surfaces. Moreover, in the battery cell 120 illustrated here, the positive and negative electrode terminals 122 are disposed on one outer wall surface. Therefore, in this exemplary battery module 110, two electrode terminal groups 125 are provided on one of the six wall surfaces forming a rectangular parallelepiped. Moreover, in the battery cell 120 illustrated here, the positive and negative electrode terminals 122 are formed in a plate shape, and the bus bar unit is welded (laser welding, ultrasonic welding, resistance welding, etc.) to the electrode terminals 122. 10 and bus bars 10P and 10M are connected.

  Furthermore, in the battery module 110 exemplified here, two electrode terminals 122 adjacent in the arrangement direction of the battery cells 120 are each formed of different kinds of conductive materials. Examples of the conductive material include metals such as aluminum, aluminum alloy, copper, and copper alloy. Hereinafter, one of the two adjacent electrode terminals 122 may be referred to as a “first electrode terminal 122A”, and the other of them may be referred to as a “second electrode terminal 122B”. In the battery module 110, the first electrode terminal 122A is formed of a first conductive material, and the second electrode terminal 122B is formed of a second conductive material.

  The electrode terminal 122 is provided with a protrusion 122a that serves as a guide for positioning when the bus bar unit 10 is connected (FIG. 2). The protrusion 122a is a columnar body protruding from an exposed plane of the electrode terminal 122 (a plane to which the bus bar unit 10 is connected as will be described later), and may be provided on all the electrode terminals 122, or a specific electrode terminal. 122 may be provided. In the former case, all the protrusions 122a may have the same shape. For example, the shape may be changed between the positive electrode terminal 122 and the negative electrode terminal 122. In the latter case, for example, it is provided only on one of the positive electrode terminal 122 and the negative electrode terminal 122. In this example, all the electrode terminals 122 are provided with the protrusions 122a having the same shape.

  The conductive module 1 is connected to at least one of the electrode terminal groups 125 with respect to the battery module 110 configured as described above. The illustrated conductive module 1 is configured to be electrically connected to both electrode terminal groups 125.

[Embodiment]
Hereinafter, one embodiment of a bus bar unit and a conductive module according to the present invention will be described with reference to FIGS. 3 to 7.

  The conductive module 1 of the present embodiment includes the following bus bar unit 10A as the bus bar unit 10 (FIGS. 3 to 6). The bus bar unit 10A includes a main bus bar member 20A and a sub bus bar member 30A. Furthermore, the conductive module 1 of the present embodiment includes an electric wire 40 that forms a pair with the bus bar unit 10A (FIG. 1). The electric wires 40 are also prepared for the bus bar 10P and for the bus bar 10M. Furthermore, the conductive module 1 of the present embodiment includes a housing member 50 in which the bus bar unit 10A and the electric wire 40 are housed (FIGS. 1 and 2). In the conductive module 1, at least one combination of a pair of bus bar units 10A and electric wires 40 that are electrically connected to each other is provided. In this example, a plurality of combinations are provided for each electrode terminal group 125.

  The bus bar unit 10A has conductivity, is electrically connected to two electrode terminals 122 adjacent in the arrangement direction of the plurality of battery cells 120, and is electrically connected to a pair of electric wires 40. Connected to. In the bus bar unit 10A, the main bus bar member 20A is welded to the first electrode terminal 122A, and the sub bus bar member 30A is welded to the second electrode terminal 122B. Since the main bus bar member 20A is welded to the first electrode terminal 122A made of the first conductive material, the main bus bar member 20A is molded with the same first conductive material as the first electrode terminal 122A. Further, since the sub bus bar member 30A is welded to the second electrode terminal 122B made of the second conductive material, the sub bus bar member 30A is formed of the same second conductive material as the second electrode terminal 122B.

  The main bus bar member 20A is physically and electrically connected to the first electrode terminal 122A by welding to the first electrode terminal 122A. The main bus bar member 20A is formed into a shape that can be disposed across two electrode terminals 122 (first electrode terminal 122A and second electrode terminal 122B) adjacent in the arrangement direction of the plurality of battery cells 120. The illustrated main bus bar member 20 </ b> A is formed into a rectangular flat plate having a size that can be covered with the two adjacent electrode terminals 122. The main bus bar member 20A has two welding points 20a (FIGS. 4 and 6), and is welded to the first electrode terminal 122A at each welding point 20a.

  The main bus bar member 20A has a fitted portion 21 into which the sub bus bar member 30A is fitted (FIGS. 3, 4, and 6). The fitted portion 21 physically and electrically connects the main bus bar member 20A and the sub bus bar member 30A by fitting the sub bus bar member 30A. In this illustration, in order to strengthen the connection, the main bus bar member 20A and the sub bus bar member 30A are fixed by welding (laser welding, ultrasonic welding, resistance welding, etc.).

  The fitted portion 21 is formed as a groove or a through hole into which the sub bus bar member 30A can be fitted. The illustrated fitted portion 21 is formed as a rectangular through hole.

  Here, as described above, the electrode terminal 122 is provided with the protrusion 122a. The illustrated main bus bar member 20A is formed with a through hole 22 for avoiding the protrusion 122a (FIGS. 3 and 4). Here, in order to avoid the protrusion 122a of the first electrode terminal 122A to be welded to the main bus bar member 20A, the through hole 22 is formed. On the other hand, in this illustration, a part of the fitted portion 21 is used to avoid the protruding portion 122a of the second electrode terminal 122B.

  The sub bus bar member 30A is formed as a separate body from the main bus bar member 20A, and is physically and electrically connected to the main bus bar member 20A by being assembled to the main bus bar member 20A. The As described above, the sub bus bar member 30A is physically and electrically connected to the main bus bar member 20A by being fitted to the fitted portion 21 of the main bus bar member 20A. . Further, the sub bus bar member 30 </ b> A is welded to the main bus bar member 20 </ b> A in a fitted state to the fitted portion 21. The sub bus bar member 30A is interposed between the second electrode terminal 122B and the main bus bar member 20A in a fitted state to the fitted portion 21, and is welded to the second electrode terminal 122B, whereby the main bus bar member 20A and the second electrode terminal 122B are electrically connected.

  At least one sub bus bar member 30A may be provided in one bus bar unit 10A. In this example, two sub bus bar members 30A are prepared. Each sub bus bar member 30A is fitted to the fitted portion 21 and welded to the second electrode terminal 122B. The sub bus bar member 30A is formed in a rectangular flat plate shape. The illustrated sub-bus bar member 30A is formed to have a plate thickness equivalent to that of the main bus bar member 20A, and is fitted to the fitting portion 21 so that its own plane and the plane of the main bus bar member 20A are flush with each other. Is done. Therefore, each sub bus bar member 30A can be brought into contact with the second electrode terminal 122B. Each sub-bus bar member 30A has a welding point 30a (FIGS. 4 and 6), and is welded to the second electrode terminal 122B at the welding point 30a.

  In the rectangular mated portion 21, the sub-bus bar members 30 </ b> A are fitted into the two end portions facing each other. In this fitted portion 21, each sub bus bar member 30A is arranged close to each end portion, and a through hole portion 21a is formed between each sub bus bar member 30A (see FIG. 3 and FIG. 3). FIG. 4). The through hole 21a is used to avoid the protrusion 122a of the second electrode terminal 122B. That is, each sub-bus bar member 30A is fitted in the fitted portion 21, leaving the through hole portion 21a for avoiding the protruding portion 122a of the second electrode terminal 122B.

  The electric wire 40 is used to electrically connect the bus bar unit 10A and the electrical connection object 200 (FIG. 1). The electric wire 40 extends in the battery pack 100 in the arrangement direction of the plurality of battery cells 120. The electrical connection object 200 is, for example, a battery monitoring unit that monitors the battery state (voltage, current, temperature, etc.) of the battery cell 120. Therefore, the electric wire 40 is provided as a voltage detection line for detecting the voltage of the battery cell 120. For example, the electric wire 40 may be electrically connected to the bus bar unit 10A via a terminal fitting (not shown), or may be electrically connected to the bus bar unit 10A by welding or brazing. .

  The housing member 50 is formed of an insulating material such as synthetic resin. The accommodating member 50 accommodates the bus bar unit 10A and the electric wire 40. The illustrated accommodating member 50 includes, for each electrode terminal group 125, a bus bar accommodating chamber 51 in which the bus bar unit 10A and the bus bars 10P and 10M are accommodated, and the electric wire 40 drawn from the bus bar unit 10A and the bus bars 10P and 10M. And an electric wire housing chamber 52 (FIG. 7).

  The illustrated accommodating member 50 includes a first bus bar accommodating chamber 51A, a second bus bar accommodating chamber 51B, and a third bus bar accommodating chamber 51C as the bus bar accommodating chamber 51 on the one electrode terminal group 125 side. The first bus bar accommodating room 51A is a room in which the bus bar unit 10A is accommodated. The first bus bar accommodating chamber 51A is formed for each bus bar unit 10A. The second bus bar accommodating room 51B is a room in which the bus bar 10P is accommodated. The third bus bar accommodating room 51C is a room in which the bus bar 10M is accommodated. One second bus bar accommodating chamber 51B and one third bus bar accommodating chamber 51C are formed. In addition, the illustrated accommodating member 50 includes a first bus bar accommodating chamber 51A for each bus bar unit 10A as the bus bar accommodating chamber 51 on the other electrode terminal group 125 side.

  One wire storage chamber 52 is provided for each electrode terminal group 125. The electric wire accommodation chamber 52 accommodates the electric wires 40 drawn from the bus bar unit 10A and the bus bars 10P and 10M. Each electric wire 40 electrically connected to each electrode terminal 122 of this electrode terminal group 125 is accommodated in the electric wire accommodation chamber 52 on the one electrode terminal group 125 side. Each electric wire 40 electrically connected to each electrode terminal 122 of the electrode terminal group 125 is accommodated in the electric wire accommodation chamber 52 on the other electrode terminal group 125 side.

  The illustrated accommodating member 50 is provided with a lid 53 for closing each opening (accommodating port) of the bus bar accommodating chamber 51 and the wire accommodating chamber 52 for each electrode terminal group 125 (FIG. 7).

  In the conductive module 1, the bus bar unit 10A is formed by attaching the sub bus bar member 30A to the main bus bar member 20A. In the conductive module 1, after the bus bar unit 10A is formed, the end of the electric wire 40 is connected to the bus bar unit 10A. In this conductive module 1, for example, after the accommodation member 50 is disposed in the battery module 110, the bus bar unit 10 </ b> A with the electric wires 40 and the bus bars 10 </ b> P and 10 </ b> M are all accommodated in the accommodation member 50. Arrange along room 52. The bus bar unit 10 </ b> A and the bus bars 10 </ b> P and 10 </ b> M are welded to the electrode terminal 122. In each bus bar unit 10A, the main bus bar member 20A is welded to the first electrode terminal 122A, and the sub bus bar member 30A is welded to the second electrode terminal 122B. In this conductive module 1, the lid 53 of the housing member 50 is closed through these steps.

  As described above, the bus bar unit 10A of the present embodiment includes the main bus bar member 20A formed of the same type of first conductive material in accordance with the first electrode terminal 122A and the same type of in accordance with the second electrode terminal 122B. And a sub bus bar member 30A formed of a second conductive material. The bus bar unit 10A is physically and electrically connected to each other by assembling the main bus bar member 20A and the sub bus bar member 30A prepared as separate parts. For the assembly, as illustrated here, a simple technique such as fitting or welding can be used. Therefore, the bus bar unit 10A according to the present embodiment can be formed at a low cost because it can suppress an increase in cost compared to that formed using a clad material. And the conductive module 1 of this embodiment is provided with the bus bar unit 10A, and can obtain the same effect as this bus bar unit 10A.

  Here, the bus bar unit 10A of the present embodiment can obtain the following effects by applying the first conductive material and the second conductive material having the following differences. For example, in this example, since the first electrode terminal 122A is formed of aluminum, the main bus bar member 20A is also formed of aluminum, and the second electrode terminal 122B is formed of copper. The member 30A is also formed of copper. That is, the illustrated first conductive material (aluminum) is a material having a specific gravity smaller than that of the second conductive material (copper). In the bus bar unit 10A of the present embodiment, the sub bus bar member 30A is fitted into the fitted portion 21 of the main bus bar member 20A, and the main bus bar member 20A occupies most of the volume. Therefore, the bus bar unit 10A of the present embodiment can be reduced in weight as long as the volume is the same as that formed using the clad material. This is because, in the bus bar member formed using the clad material, the portion formed of the first conductive material and the portion formed of the second conductive material are arranged at substantially the same rate. Because. Such an effect can also be obtained in the conductive module 1. In the conductive module 1, the bus bar unit 10 </ b> A is arranged at a plurality of locations, and thus the effect of reducing the weight appears to be remarkable.

[Modification 1]
A bus bar unit and a conductive module according to this modification will be described with reference to FIGS.

  The conductive module 1 of this modification includes a bus bar unit 10B shown below as the bus bar unit 10. Here, in the conductive module 1 according to the above-described embodiment, the bus bar unit 10A is replaced with the bus bar unit 10B.

  The bus bar unit 10B of this modification includes a main bus bar member 20B and a sub bus bar member 30B.

  The illustrated main bus bar member 20B has two electrode terminals 122 adjacent to each other in the arrangement direction of the plurality of battery cells 120 (first electrode terminal 122A, second electrode terminal 122B), similarly to the main bus bar member 20A of the embodiment. It is molded into a shape that can be placed across And this main bus bar member 20B is shape | molded in the rectangular flat plate shape of the magnitude | size which can cover the two adjacent electrode terminals 122. FIG. The main bus bar member 20B of this modification has two welding points 20a (FIGS. 9 and 10), and is welded to the first electrode terminal 122A at each welding point 20a.

  The main bus bar member 20B has a fitted portion 21 into which the sub bus bar member 30B is fitted, similarly to the main bus bar member 20A of the embodiment (FIGS. 8 to 10). Also in this modification, the to-be-fitted part 21 is illustrated as what was formed in the rectangular through-hole. The main bus bar member 20B is formed with a through hole 22 for avoiding the protrusion 122a of the first electrode terminal 122A (FIGS. 8 and 9).

  In addition, the illustrated secondary bus bar member 30B is formed as a separate body from the main bus bar member 20B, and is assembled to the main bus bar member 20B in the same manner as the auxiliary bus bar member 30A of the embodiment. It is physically and electrically connected to the member 20B. Also in this modified example, the sub bus bar member 30B is formed in a rectangular flat plate shape and is prepared to be fitted into the fitted portion 21 in the same manner as the sub bus bar member 30A of the embodiment. The sub bus bar member 30 </ b> B is welded to the main bus bar member 20 </ b> B while being fitted to the fitted portion 21.

  The sub bus bar member 30B is interposed between the second electrode terminal 122B and the main bus bar member 20B in a fitted state with the fitted portion 21, and is welded to the second electrode terminal 122B, whereby the main bus bar member 20B and the second electrode terminal 122B are electrically connected. Each sub bus bar member 30B has a welding point 30a (FIGS. 9 and 10), and is welded to the second electrode terminal 122B at the welding point 30a. Each sub-bus bar member 30B is fitted into the fitted portion 21, leaving a through hole portion 21a (FIGS. 8 and 9) for avoiding the protruding portion 122a of the second electrode terminal 122B.

  Here, in the battery module 110 of the present modification, the first electrode terminal 122A is made of copper, and the second electrode terminal 122B is made of aluminum. Therefore, in this modification, the main bus bar member 20B is formed of copper, and the sub bus bar member 30B is formed of aluminum. In the bus bar unit 10B of this modification, the sub bus bar member 30B is fitted into the fitted portion 21 of the main bus bar member 20B, and the main bus bar member 20B occupies most of the volume. Therefore, if the bus bar unit 10B is formed to have the same shape and the same size as the bus bar unit 10A of the embodiment, the bus bar unit 10B is heavier than the bus bar unit 10A. However, the first conductive material (copper) has a higher conductivity than the second conductive material (aluminum). Accordingly, when the bus bar unit 10B of the present modification is formed to have the same shape and the same size as the bus bar unit 10A of the embodiment, the bus bar unit 10B is configured to be more conductive than the bus bar unit 10A. Can do. Moreover, if the bus bar unit 10B of this modification may reduce electroconductivity, the volume of the main bus bar member 20B can be reduced, so that the physique can be reduced in size and weight. For example, if the bus bar unit 10B may be of the same conductivity as the bus bar unit 10A of the embodiment, the size of the bus bar unit 10B can be reduced, so that the main bus bar member 20B has a higher conductivity than the sub bus bar member 30B. Even if is used, an increase in weight can be suppressed or weight reduction can be achieved.

  The bus bar unit 10B and the conductive module 1 of this modification not only obtain the same effects as the bus bar unit 10A and the conductive module 1 of the above-described embodiment, but also the conductivity of the first conductive material is higher than that of the second conductive material. A more useful effect can be obtained by using a material having a high value.

[Modification 2]
A bus bar unit and a conductive module according to this modification will be described with reference to FIGS.

  The conductive module 1 of this modification includes a bus bar unit 10 </ b> C shown below as the bus bar unit 10. Here, in the conductive module 1 of the above-described embodiment, the bus bar unit 10A is described as being replaced with the bus bar unit 10C.

  The bus bar unit 10C of the present modification includes a main bus bar member 20C and a sub bus bar member 30C.

  The illustrated main bus bar member 20C has two electrode terminals 122 adjacent to each other in the arrangement direction of the plurality of battery cells 120 (first electrode terminal 122A and second electrode terminal 122B), similarly to the main bus bar member 20A of the embodiment. It is molded into a shape that can be placed across The main bus bar member 20 </ b> C is formed into a rectangular flat plate having a size that can be covered with the two adjacent electrode terminals 122. The main bus bar member 20C of this modification has two welding points 20a (FIGS. 11 and 12), and is welded to the first electrode terminal 122A at each welding point 20a.

  The main bus bar member 20C has a fitted portion 21 into which the sub bus bar member 30C is fitted, similarly to the main bus bar member 20A of the embodiment. Also in this modification, the to-be-fitted part 21 is illustrated as what was formed in the rectangular through-hole. The main bus bar member 20C is formed with a through hole 22 for avoiding the protrusion 122a of the first electrode terminal 122A (FIG. 11).

In addition, the exemplary sub bus bar member 30C is formed as a separate member from the main bus bar member 20C, and is assembled to the main bus bar member 20C in the same manner as the sub bus bar member 30A of the embodiment. It is physically and electrically connected to the member 20C. Also in this modified example, the sub bus bar member 30C is formed in a rectangular flat plate shape and is provided with two members to be fitted into the fitted portion 21 as in the sub bus bar member 30A of the embodiment. The sub bus bar member 30C has, for example, a plurality of rivet portions 30C ₁ in order to maintain the fitted state to the fitted portion 21, and the main bus bar member 20C is connected to the main bus bar member 20C via the rivet portions 30C _1. It is riveted.

  The sub bus bar member 30C is interposed between the second electrode terminal 122B and the main bus bar member 20C in a fitted state to the fitted portion 21, and is welded to the second electrode terminal 122B. 20C and the second electrode terminal 122B are electrically connected. Each sub bus bar member 30C has a welding point 30a (FIGS. 11 and 12), and is welded to the second electrode terminal 122B at the welding point 30a. Each sub-bus bar member 30C is fitted in the fitted portion 21 with the through-hole portion 21a for avoiding the protruding portion 122a of the second electrode terminal 122B (FIG. 11).

  The bus bar unit 10C and the conductive module 1 of the present modification have the same effects as the bus bar unit 10A and the conductive module 1 of the above-described embodiment even if the fixing structure between the main bus bar member 20C and the sub bus bar member 30C is changed. Can be obtained.

DESCRIPTION OF SYMBOLS 1 Conductive module 10,10A, 10B, 10C Bus bar unit 20A, 20B, 20C Main bus bar member 20a Welding point 21 Fit part 30A, 30B, 30C Sub bus bar member 30a Welding point 40 Electric wire 50 Housing member 110 Battery module 120 Battery cell 122 electrode terminal 122A first electrode terminal 122B second electrode terminal 200 electrical connection object

Claims (5)

A main bus bar member formed of the first conductive material;
A sub-bus bar member that is molded separately from the main bus bar member with a second conductive material, and is physically and electrically connected to the main bus bar member by being assembled to the main bus bar member;
With
The main bus bar member is formed into a shape that can be disposed across two adjacent electrode terminals of a battery module in which a plurality of battery cells having positive and negative electrode terminals are arranged, Welding to the first electrode terminal made of the first conductive material of the first, and physically and electrically connected to the first electrode terminal,
The sub bus bar member is interposed between the second electrode terminal made of the second conductive material of the two adjacent electrode terminals and the main bus bar member, and is welded to the second electrode terminal. The bus bar unit, wherein the main bus bar member and the second electrode terminal are electrically connected.   The bus bar unit according to claim 1, wherein the main bus bar member has a fitted portion into which the sub bus bar member is fitted.   The bus bar unit according to claim 1, wherein the first conductive material is a material having a specific gravity smaller than that of the second conductive material.   3. The bus bar unit according to claim 1, wherein the first conductive material is a material having higher conductivity than the second conductive material. 4. A bus bar unit for electrically connecting two adjacent electrode terminals of a battery module in which a plurality of battery cells having positive and negative electrode terminals are arranged;
An electric wire extending in the arrangement direction of the plurality of battery cells and electrically connecting the bus bar unit and the electrical connection object;
A housing member for housing the bus bar unit and the wire;
With
The bus bar unit is molded as a separate body from the main bus bar member formed from the first conductive material and the main bus bar member from the second conductive material. A sub-bus bar member physically and electrically connected to the bus bar member,
The main bus bar member is formed into a shape that can be disposed across two adjacent electrode terminals, and is welded to the first electrode terminal made of the first conductive material of the two adjacent electrode terminals. And physically and electrically connected to the first electrode terminal,
The sub bus bar member is interposed between the second electrode terminal made of the second conductive material of the two adjacent electrode terminals and the main bus bar member, and is welded to the second electrode terminal. A conductive module characterized in that the main bus bar member and the second electrode terminal are electrically connected.

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