JP2013033635A - Battery module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate assembly of a battery module.SOLUTION: A battery module BM in which a plurality of single batteries 11 each provided with a pair of electrode terminals 14 are arranged on an upper face of a battery case 12, comprises: a plurality of fastening members 18 and 19 for connecting in series the plurality of single batteries 11 by fastening each of the electrode terminals 14 of the single battery 11 together with the electrode terminal 14 of the neighboring single battery 11; voltage detection harnesses 21 each including voltage detection terminals 23 each in contact with each of the electrode terminals 14 of the single battery 11, and a plurality of electric wires 22 derived from the voltage detection terminals 23; resin protectors 30 for holding the voltage detection harnesses 21; and pitch adjustment means 34 each provided in the resin protector 30, and capable of adjusting pitch between the voltage detection terminals 23.

Description

  The present invention relates to a battery module.

Electric vehicles, hybrid vehicles, and the like are equipped with a battery module for power. Basically, a unit cell group in which a plurality of unit cells are connected in series, and each unit cell in the unit cell group. In order to measure the output voltage, a voltage detection line connected to the electrode terminal of each unit cell is provided. As an example thereof, one described in Patent Document 1 below is known.
In this product, the electrode terminals of adjacent unit cells are connected by passing bus bars, and each bus bar is held in a resin protector in a predetermined arrangement for the convenience of attaching those bus bars. At the same time, the voltage detection line is accommodated in the resin protector, thereby forming a battery wiring module that is collectively attached to the unit cell group.

JP 2011-49047 A

In the conventional structure described above, the number of bus bars and voltage detection lines is inevitably increased as the number of cells increases, but the increase in the number of bus bars increases the size of the resin protector that accommodates the bus bars. This increases the size and weight of the battery wiring module. As a result, it became difficult to handle, and as a result, there was concern that it would take time to assemble the battery module, and further improvements were desired.
The present invention has been completed based on the above circumstances, and an object of the present invention is to facilitate the assembly of the battery module.

  The present invention is a battery module configured by arranging a plurality of unit cells each having a pair of electrode terminals provided on an upper surface of a battery case, wherein each electrode terminal of the unit cell is fastened together with an electrode terminal of an adjacent unit cell. A plurality of fastening members that connect the plurality of unit cells in series; a voltage detection terminal that contacts the electrode terminals of the unit cells; and a voltage detection harness that includes a plurality of electric wires derived from the voltage detection terminals; And a resin protector that holds the voltage detection harness, and a pitch adjustment means that is provided in the resin protector and that allows the pitch between the voltage detection terminals to be adjusted.

  By connecting both electrode terminals directly with a fastening member to connect the electrode terminals of adjacent unit cells, a bus bar as a battery connecting member can be eliminated. Therefore, a so-called battery wiring module that is retrofitted to the unit cell array is limited to a resin protector that holds a voltage detection harness, and is small and lightweight. Therefore, it is easy to handle, and as a result, the assembly work of the battery module can be easily performed.

The following configuration may also be used.
(1) The electrode terminal of the unit cell is formed into an L-shaped plate that rises from the upper surface of the unit cell and is bent toward the adjacent unit cell side, and the bent portions of adjacent electrode terminals overlap each other. The overlapped portion is fastened by the fastening member. When two unit cells are arranged, the bent portion of the electrode terminal of one unit cell and the bent portion of the electrode terminal of the adjacent unit cell are overlapped in the vertical direction, and the overlapped portion is fastened by a fastening member.

(2) While the stud bolt is raised at the lower bent portion of the two electrode terminals to be overlapped, an insertion hole of the stud bolt is opened at the upper bent portion, and the protruding end of the stud bolt passing through the insertion hole The nut is screwed into the nut.
When arranging two unit cells, the electrode terminal with the insertion hole formed on the electrode terminal on which the stud bolt is erected is passed through the stud bolt so that one unit cell extends along the side surface of the other unit cell. By moving down, the single cells are closely arranged. Both electrode terminals are connected by screwing and tightening a nut to the stud bolt. The operation | work which connects the adjacent cell can be performed easily.

  (3) The voltage detection terminal is brought into contact with the electrode terminal by being fastened together when the adjacent electrode terminals are fastened. The operation of bringing the voltage detection terminal into contact with the predetermined electrode terminal can be easily performed.

(4) The resin protector has a terminal accommodating portion for individually accommodating the voltage detection terminals at a predetermined interval on one side edge of an elongated electric wire accommodating portion for accommodating a plurality of electric wires constituting the voltage detection harness. It has a projecting shape, and the electric wire housing portion is divided at each position between the terminal housing portions, and each divided portion is connected via a hinge portion that can be expanded and contracted.
The pitch between the terminal accommodating portions, that is, the voltage detection terminals is adjusted while the hinge portion expands and contracts, and the mounting error between the resin protector and the single cell group in which a plurality of single cells are arranged is absorbed. Since the resin protector is formed as a single body, the assembly work of the resin protector itself can be made unnecessary, which can further contribute to speeding up the battery module assembly work.

  According to the present invention, the battery module can be easily assembled.

1 is an exploded perspective view of a battery module according to an embodiment of the present invention. Single cell perspective view Front view of single cell group Plan view of battery wiring module Battery module perspective view Plan view Front view Same side view

<Embodiment>
An embodiment of the present invention will be described with reference to FIGS.
The battery module BM according to the present embodiment is used as a drive source for an electric vehicle or a hybrid vehicle. As shown in FIG. 1, the battery module BM includes a unit cell group 10 in which a plurality (ten in this embodiment) of unit cells 11 are arranged side by side, and a plurality of unit cells 11 attached to the unit cell group 10. The two battery wiring modules 20 are connected to each other.

The unit cell 11 has a structure in which a power generation element is housed in a flat case 12 having a substantially rectangular parallelepiped shape, and a pair of electrode terminals 14 are provided at positions near both ends on the upper surface of the case 12. .
As shown in FIG. 2, two types of unit cell 11 are provided. In one unit cell 11A (hereinafter referred to as first unit cell 11A), the front side of the figure has a positive electrode terminal 14P and the back side has a negative electrode. On the other hand, in the other unit cell 11B (hereinafter referred to as the second unit cell 11B), the front side is a negative electrode terminal 14N and the back side is a positive electrode terminal 14P.

  The electrode terminal 14 is formed by processing a metal plate such as copper, copper alloy, aluminum, aluminum alloy, stainless steel (SUS) into a predetermined shape. Here, the electrode terminal 14 is a portion that mainly protrudes outward from the upper surface of the case 12 of the unit cell 11, and the base side of each electrode terminal 14 is provided by a power generation element in the case 12. Each is connected to an electrode (not shown).

The positive electrode terminal 14P rises by a predetermined dimension from the center width position on the upper surface of the case 12 (rising portion 15P), and the tip is bent at a right angle (bending portion 16P) when viewed from the right front of FIG. The tip of the bent portion 16P is formed in an L shape that protrudes from the left side surface of the case 12 of the unit cell 11 by a predetermined dimension (a little less than half the thickness of the unit cell 11).
Similarly, the negative electrode terminal 14N rises a predetermined dimension from the center width position on the upper surface of the case 12 (rising portion 15N), the tip is bent to the right (bending portion 16N), and the tip of the bending portion 16N is The unit cell 11 is formed in an L shape protruding from the right side surface of the case 12 with the same dimensions.

Here, the rising dimension of the rising portion 15N of the negative electrode terminal 14N is larger than the rising dimension of the rising portion 15P of the positive electrode terminal 14P by the plate thickness of the electrode terminal 14, in other words, the negative electrode terminal. The bent portion 16N of 14N is formed at a position that is one step higher than the bent portion 16P of the positive electrode terminal 14P by the plate thickness of the electrode terminal 14.
Bolt insertion holes 17 (hereinafter simply referred to as insertion holes 17) are respectively opened in the bent portion 16P of the positive electrode terminal 14P and the bent portion 16N of the negative electrode terminal 14N at the center in the width direction. More specifically, the insertion hole 17 in the bent portion 16P of the positive electrode terminal 14P corresponds to the position of the left side surface of the unit cell 11, and the insertion hole 17 in the bent portion 16N of the negative electrode terminal 14N is The center corresponds to the position of the right side surface of the unit cell 11.

Therefore, when the two unit cells 11A and 11B shown in FIG. 2 are arranged with their side surfaces in contact with each other, the bent portion 16N of the negative electrode terminal 14N of the second unit cell 11B and the positive electrode of the first unit cell 11A are arranged. The bent portion 16P of the electrode terminal 14P is vertically overlapped, and the insertion holes 17 are aligned with each other.
In the present embodiment, the stud bolt 18 is fixed to the positive electrode terminal 14P of each unit cell 11 by welding, and the shaft portion 18B protrudes from the upper surface of the bent portion 16P. In addition, about the 1st single battery 11A distribute | arranged to the right back in FIG. 1, the stud volt | bolt 18 is being fixed also about the electrode terminal 14N of a negative electrode.
A nut 19 (see FIG. 6) is screwed to the shaft portion 18B of the stud bolt 18, and the stud bolt 18 and the nut 19 constitute a fastening member of the present invention.

Next, the battery wiring module 20 will be described. The two battery wiring modules 20 are provided as described above, and include the voltage detection harness 21 and the resin protector 30 that accommodates and holds the voltage detection harness 21.
As shown in FIG. 4, the voltage detection harness 21 includes a plurality of covered electric wires 22 each having a voltage detection terminal 23 connected to a terminal. The voltage detection terminal 23 is formed by pressing a metal plate having excellent conductivity, a central hole 25 is opened in a rectangular main body portion 24, and a barrel portion provided at the rear edge of the main body portion 24. 26 is caulked to the end of the covered electric wire 22 and fixed.
The voltage detection harness 21A disposed on the battery wiring module 20A on the near side in FIG. 1 (lower side in FIG. 4) includes five covered electric wires 22, and the battery on the back side in FIG. 1 (upper side in FIG. 4). In the voltage detection harness 21B arranged in the wiring module 20B, six covered electric wires 22 are provided.

The resin protector 30 includes a plurality of terminal accommodating portions 35 that individually accommodate the voltage detecting terminals 23 at a predetermined interval on one side wall of an elongated electric wire accommodating portion 31 that accommodates the plurality of covered electric wires 22 constituting the voltage detecting harness 21. The shape is formed by opening and projecting.
Taking the resin protector 30A on the near side in FIG. 1 (lower side in FIG. 4) as an example, the wire housing portion 31 is formed in a channel shape, but the wire housing portion 31 has five identical lengths. The housing unit 32 is divided and arranged in a line at a predetermined interval. Between the edges of one side wall 33 in the adjacent accommodating unit 32, a hinge part 34 that performs a surplus length absorbing function is formed to bulge outward.

A terminal accommodating portion 35 is formed so as to protrude from a central portion in the length direction of the side wall 33 in each accommodating portion unit 32. The terminal accommodating portion 35 is a barrel portion accommodating in which the barrel portion 26 of the voltage detecting terminal 23 is fitted on the base side of the main body accommodating portion 36 having a flat rectangular shape to which the main body portion 24 of the voltage detecting terminal 23 is closely fitted. This is a shape formed by connecting the portions 37.
As shown in FIG. 1, an escape groove 38 is formed in the bottom plate of the main body accommodating portion 36 to fit the bent portion 16N of the negative electrode terminal 14N. As will be described later, when the unit cells 11 are assembled side by side and the unit cell group 10 is formed, the five terminal accommodating portions 35 are formed at the same pitch as the arrangement pitch of the stud bolts 18. Yes.

  The resin protector 30B on the back side in FIG. 1 (upper side in FIG. 4) has the same basic shape in which a plurality of terminal accommodating portions 35 are formed on one side wall 33 of the electric wire accommodating portion 31 so as to protrude at predetermined intervals. The housing portion unit 32 and the terminal housing portion 35 constituting the wire housing portion 31 are both formed.

Next, an example of the assembly procedure of the battery module BM of this embodiment will be described.
First, as shown in FIGS. 1 and 3, two types of single cells 11A and 11B are alternately stacked in the horizontal direction. For example, when the innermost first unit cell 11A in FIG. 1 is installed on the assembly base, the next second unit cell 11B is inserted into the insertion hole 17 of the bent portion 16N in the negative electrode terminal 14N on the near side. Are moved down along the left side surface of the first unit cell 11A and are closely arranged on the left side while being inserted into the stud bolt 18 standing on the positive electrode terminal 14P on the front side of the first unit cell 11A. .

Subsequently, the first unit cell 11A has the insertion hole 17 of the bent portion 16N in the negative electrode terminal 14N on the back side on the stud bolt 18 that stands on the positive electrode terminal 14P on the back side of the second unit cell 11B. While being inserted, it is moved down along the left side surface of the second unit cell 11B and closely arranged on the left side.
Thereafter, in the same manner as described above, the second unit is inserted into the insertion hole 17 of the bent portion 16N of the negative electrode terminal 14N through the stud bolt 18 standing on the bent portion 16P of the corresponding positive electrode terminal 14P. The battery group 10 is formed by alternately arranging the batteries 11B and the first battery cells 11A on the left side.

In the unit cell group 10 formed in this way, the second unit cell is formed on the upper surface of the bent portion 16P of the positive electrode terminal 14P in the first unit cell 11A at five positions along the front edge on the upper surface. In the battery 11B, the bent portion 16N of the negative electrode terminal 14N is overlapped, and the shaft portion 18B of the stud bolt 18 protrudes from the upper surface of the bent portion 16N of the negative electrode terminal 14N.
On the other hand, the bending of the negative electrode terminal 14N of the first unit cell 11A on the upper surface of the bent part 16P of the positive electrode terminal 14P of the second unit cell 11B at the four central positions along the edge on the back side. The portion 16N is overlapped, and the shaft portion 18B of the stud bolt 18 protrudes from the upper surface of the bent portion 16N of the negative electrode terminal 14N.
The negative electrode terminal 14N provided at the end of the right end of the first unit cell 11A has a stud bolt 18 upright at the bent portion 16N without overlapping with the positive electrode terminal 14P. The positive electrode terminal 14P provided at the end on the back side of the second single battery 11B takes a form in which the stud bolt 18 is raised alone without the negative electrode terminal 14N being overlapped.

In other words, at the position along the front edge on the upper surface of the unit cell group 10, five stud bolts 18 that are raised from the overlapping portion of the positive and negative electrode terminals 14P and 14N are arranged at a constant pitch. On the other hand, at the position along the edge on the back side, four stud bolts 18 in a form raised from the overlapping portion of the positive and negative electrode terminals 14P, 14N, the single electrode terminal 14P of the positive electrode, and the negative electrode A total of six stud bolts 18 including two stud bolts 18 respectively raised from the single electrode terminal 14N are arranged at the same pitch as described above. However, the front side stud bolt 18 and the back side stud bolt 18 are arranged in a staggered pattern with a pitch shifted by one cell 11.
Although not shown in detail, the unit cell group 10 formed as described above is fixed by known fixing means such as a holding plate.

On the other hand, the voltage detection harness 21 is accommodated in the resin protector 30, and the battery wiring module 20 is assembled. As shown in FIG. 4, both the resin protectors 30 </ b> A and 30 </ b> B are arranged in parallel so that the terminal accommodating portions 35 face each other.
In the battery wiring module 20A on the front side, after the voltage detection terminal 23 corresponding to the rightmost terminal accommodation portion 35 in the resin protector 30A is accommodated, the covered electric wire 22 connecting the voltage detection terminal 23 to the terminal is provided. After being pulled out to the rightmost storage unit 32, it is pulled out to the right side of the figure through the storage unit 32.

  Next, after the corresponding voltage detection terminal 23 is accommodated in the second terminal accommodating portion 35 from the right, the connected covered electric wire 22 is drawn out to the second accommodating portion unit 32, and then the accommodating portion The units 32 and the rightmost housing unit 32 are arranged side by side and pulled out to the right side of FIG. Similarly, after the voltage detection terminal 23 is accommodated in the remaining terminal accommodating portion 35, the connected covered electric wire 22 is drawn out to the accommodating portion unit 32, and then the accommodating portion unit 32 on the right side of it. It is pulled out sequentially to the right through.

Although not shown in the drawing, terminal fittings are provided at the drawn ends of the five covered electric wires 22, respectively. These terminal fittings are accommodated in a common connector, and the connector performs processing of the detection signal. It is connected to an ECU having a function.
As described above, the voltage detection terminals 23 are individually accommodated in the five terminal accommodating portions 35 of the resin protector 30 </ b> A, and the five covered electric wires 22 derived therefrom are being passed along the electric wire accommodating portion 31. The assembly of the battery wiring module 20A on the near side, which is pulled out and has a connector provided at the leading end, is completed.
Although not shown, the housing unit 32 constituting the wire housing portion 31 may be provided with a holding portion that lightly presses the covered wire 22 to prevent it from coming off.

For the battery wiring module 20B on the back side, the voltage detection terminals 23 are sequentially accommodated from the terminal accommodating portion 35 at the right end of the resin protector 30B in the same manner as described above, and then the covered electric wire 22 is pulled out to the accommodating portion unit 32. After that, it is repeated to be sequentially pulled out to the right side through the accommodating unit 32 on the right side of the same, and similarly connected to the common connector.
That is, the voltage detection terminals 23 are individually accommodated in the six terminal accommodating portions 35 of the resin protector 30 </ b> B, and the six covered electric wires 22 led out therefrom are pulled out while being lined up in the electric wire accommodating portion 31. As a result, the assembly of the battery wiring module 20B on the back side in which the connector is provided at the drawer end is completed.

As shown in FIG. 1, each of the battery wiring modules 20 </ b> A and 20 </ b> B formed as described above is placed on the row of the electrode terminals 14 on the front side and the back side of the upper surface of the unit cell group 10.
Specifically, in the battery wiring module 20 </ b> A on the near side, the five terminal accommodating portions 35 in the resin protector 30 </ b> A are fitted into the corresponding stud bolts 18, and the stud bolts 18 are inserted into the center holes 25 of the voltage detection terminals 23. The voltage detection terminal 23 is placed on the bent portion 16N while the negative bent portion 16N of the electrode terminals 14P and 14N overlapped with the escape groove 38 of the bottom plate.

  On the other hand, in the battery wiring module 20 </ b> B on the back side, the six terminal accommodating portions 35 in the resin protector 30 </ b> B are fitted into the corresponding stud bolts 18, and the stud bolts 18 are inserted into the center holes 25 of the voltage detection terminals 23. Here, in the four terminal housing portions 35 in the center, the negative electrode bent portion 16N of the overlapping electrode terminals 14P and 14N is fitted in the escape groove 38 of the bottom plate, and the voltage detection terminal 23 is placed on the bent portion 16N. It is done. In the terminal housing portion 35 at the right end, the voltage detection terminal 23 is placed on the bent portion 16N of the negative electrode terminal 14N as a single unit. In the terminal housing portion 35 at the left end, the voltage detection terminal 23 faces above the bent portion 16P of the single positive electrode terminal 14P.

  Thus, when both battery wiring modules 20A and 20B are put on the row of the front and back electrode terminals 14, as shown in FIG. 6, the bent portion of the negative electrode terminal 14N is formed in each terminal accommodating portion 35. Nuts 19 are respectively screwed onto the tips of the shaft portions 18B of the stud bolts 18 protruding above 16N (partly bent portions 16P of the positive electrode terminals 14P), and tightened using a tool (not shown).

As a result, the voltage detection terminal 23 and the negative and positive electrode terminals 14N and 14P are arranged at the five electrode terminal 14 locations on the near side and the four central electrode terminal 14 locations on the far side. The three bent portions 16N and 16P are vertically overlapped and sandwiched between the head 18A of the stud bolt 18 and the nut 19. Further, the voltage detection terminal 23 and the bent portion 16N of the negative electrode terminal 14N overlap and are sandwiched between the nut 19 and the head 18A of the stud bolt 18 at the far right end, and at the left end, the voltage detection terminal 23 and The bent portion 16P of the positive electrode terminal 14P overlaps and is sandwiched between the nut 19 and the head 18A of the stud bolt 18.
Note that a cover (not shown) is covered and covered on the upper surface of the unit cell group 10 to which the battery wiring modules 20A and 20B are attached.

When the battery module BM is assembled as described above, a voltage detection circuit that detects the output voltage of each unit cell 11 constituting the unit cell group 10 is configured.
When the battery wiring modules 20A and 20B are assembled, the lengths of the resin protectors 30A and 30B are adjusted while the interval between the adjacent accommodating unit 32 is changed by the expansion and contraction of the hinge portion 34 while the covered wire 22 is appropriately bent. Thus, the mounting error with the unit cell group 10 is absorbed.

According to this embodiment, the following effects can be obtained.
In order to connect the electrode terminals 14 of the adjacent unit cells 11, both the electrode terminals 14 are directly fastened by the stud bolt 18 and the nut 19, so that a bus bar as a battery connecting member can be made unnecessary. Therefore, the battery wiring module 20 that is retrofitted to the unit cell group 10 in which the unit cells 11 are arranged can be limited to the one that holds the voltage detection harness 21 on the resin protector 30, and is small and light. Therefore, it is easy to handle, and as a result, the assembly work of the battery module BM can be easily performed.

The structure of the part connecting the electrode terminals 14 of the adjacent unit cells 11 is such that both electrode terminals 14P and 14N are formed in an L shape and the bent parts 16P and 16N are overlapped, and the overlapped part is the stud bolt 18 described above. And the nut 19 are fastened so that the work of connecting the adjacent unit cells 11 can be easily performed.
Further, since the voltage detection terminal 23 constituting the voltage detection harness 21 is brought into contact with the electrode terminal 14 by being fastened together when the adjacent electrode terminals 14 are fastened, the voltage detection terminal The operation | work which makes 23 contact the predetermined electrode terminal 14 can also be performed easily.

  The resin protector 30 of the present embodiment has a structure in which the electric wire accommodating portion 31 is formed in a form in which the divided accommodating portion units 32 are connected via the hinge portion 34, and the terminal portion is accommodated while the hinge portion 34 expands and contracts. The pitch between the portions 35, that is, the voltage detection terminals 23 is adjusted, and an attachment error between the resin protector 30 and the unit cell group 10 in which a plurality of unit cells 11 are arranged is absorbed. Since the resin protector 30 is formed as an integrated object, the assembly work of the resin protector 30 itself can be made unnecessary, which can further contribute to speeding up the assembly work of the battery module BM.

<Other embodiments>
The present invention is not limited to the embodiments described with reference to the above description and drawings. For example, the following embodiments are also included in the technical scope of the present invention.
(1) The positive and negative electrode terminals are fastened by fixing the nut to the lower surface of the lower bent portion by welding or the like, and screwing the bolt inserted into the upper bent portion into the nut to tighten it. May be.
(2) In the above embodiment, the positive and negative electrode terminals are stacked one above the other. However, a vertical overlapping portion may be provided, and the overlapping portion may be fastened with a bolt and a nut that are turned sideways. .

(3) In the above embodiment, the voltage detection terminal constituting the voltage detection harness is brought into contact with the predetermined electrode terminal by fastening together with the electrode terminal to be fastened. You may employ | adopt the structure made to contact a predetermined | prescribed electrode terminal by means different from fastening together.
(4) Although the two battery wiring modules are provided in the above embodiment, the battery wiring module may be provided as a single member by connecting ends of the resin protectors.

  (5) In the above embodiment, the pitch is obtained by dividing the electric wire housing portion in the resin protector into a plurality of housing portion units, and connecting the divided housing portion units with integrally provided hinge portions. Although the adjusting means is configured, as another means, a structure in which each accommodating unit is formed as a separate body and adjacent accommodating units are connected to each other via a connecting part may be adopted. .

BM ... Battery module 10 ... Single cell group 11, 11A, 11B ... Single cell 12 ... Case (battery case)
14, 14P, 14N ... Electrode terminal 16P, 16N ... Bending part 17 ... Insertion hole 18 ... Stud bolt (fastening member)
19 ... Nut (fastening member)
20, 20A, 20B ... Battery wiring module 21, 21A, 21B ... Harness for voltage detection 22 ... Covered electric wire (electric wire)
DESCRIPTION OF SYMBOLS 23 ... Voltage detection terminal 30, 30A, 30B ... Resin protector 31 ... Electric wire accommodating part 32 ... Accommodating part unit (parting part)
34 ... Hinge (pitch adjusting means)
35 ... Terminal receiving part

Claims (5)

A battery module configured by arranging a plurality of cells each having a pair of electrode terminals on the upper surface of a battery case,
A plurality of fastening members for fastening each electrode terminal of the unit cell together with an electrode terminal of an adjacent unit cell to connect the plurality of unit cells in series,
A voltage detection harness comprising a voltage detection terminal that contacts each electrode terminal of the unit cell and a plurality of electric wires derived from the voltage detection terminals, and
A resin protector for holding the voltage detection harness;
Pitch adjusting means provided in the resin protector, which enables adjustment of the pitch between the voltage detection terminals;
A battery module comprising: The electrode terminals of the unit cell are formed in an L-shaped plate that rises from the upper surface of the unit cell and is bent toward the adjacent unit cell side, and the bent portions of adjacent electrode terminals are overlapped with each other. The battery module according to claim 1, wherein the overlapping portion is fastened by the fastening member. A stud bolt is raised at the lower bent portion of both electrode terminals to be overlapped, and an insertion hole for the stud bolt is opened at the upper bent portion, and a nut is provided at the protruding end of the stud bolt passing through the insertion hole. The battery module according to claim 2, wherein the battery module is screwed together. The battery module according to any one of claims 1 to 3, wherein the voltage detection terminal is brought into contact with the electrode terminal by being fastened together when the adjacent electrode terminals are fastened. . The resin protector is formed at one side edge of an elongated electric wire accommodating portion that accommodates a plurality of electric wires constituting the voltage detecting harness, and a terminal accommodating portion that individually accommodates the voltage detecting terminals is formed with a predetermined interval therebetween. 2. The electric wire housing portion is divided at each position between the terminal housing portions, and each divided portion is connected via an extendable hinge portion. The battery module according to any one of 4.

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