JP2013161648A - Coupling cap - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coupling cap capable of facilitating assembly of a plurality of batteries, and of reducing the number of assembled components.SOLUTION: A coupling cap 1 is attached to each of a plurality of unit cells 2 aligned in a cell alignment direction Y1 to connect the unit cells 2 in series. The coupling cap 1 comprises: a pair of electrode fitting parts fitting both electrodes protruded from the unit cell 2; a first conductive member connected to one of the pair of electrode fitting parts, and to which a first male terminal part 4a is formed; a second conductive member connected to the other of the pair of electrode fitting parts, and to which a first female terminal part 5a fitted by the first male terminal part of the other coupling cap is formed; and a housing 7 housing the pair of electrode fitting parts, the first conductive member, and the second conductive member. The first male terminal part 4a is protruded from one side in the cell alignment direction Y1, of the housing 7. The first female terminal part 5a is arranged in parallel to the first male terminal part 4a in the cell alignment direction Y1, and exposed from an opening provided to the other side in the cell aligment direction Y1, of the housing 7.

Description

  The present invention relates to a connection cap, and more particularly to a connection cap that is attached to a plurality of batteries arranged in the arrangement direction and connects these batteries in series.

  For example, an assembled battery is mounted as a drive source of the electric motor in an electric vehicle that runs using an electric motor or the like, or a hybrid vehicle that runs using an engine and an electric motor together. The assembled battery is composed of a plurality of batteries that are stacked on top of each other and connected in series with each other. In order to connect the plurality of batteries in series, for example, an L-shape having a first wall part that projects battery electrodes from the upper surface of the battery, and a second wall part that is parallel to the upper surface of the battery from the upper end of the first wall part. Proposed that the second wall part and the second wall part of the L-shaped electrodes of adjacent batteries overlap each other when a plurality of batteries are arranged side by side, and these are connected by a fixture such as a rivet (Patent Document 1).

  However, in this method, a fixture such as a rivet is used to connect a plurality of batteries in series. Since many kinds of parts are required for assembling the battery, an assembled battery having a large number of batteries, such as an electric car or a hybrid car, has a problem in that work efficiency is poor and the number of parts increases.

JP 2008-181765 A

  Therefore, an object of the present invention is to provide a connection cap that facilitates the assembly of a plurality of batteries and reduces the number of assembled components.

  The invention described in claim 1 for solving the above-described problem is a connection cap that is attached to a plurality of batteries arranged in the alignment direction and connects the batteries in series, and is provided on both electrodes protruding from the battery. A pair of electrode fitting portions to be fitted, a first conductive member connected to one of the pair of electrode fitting portions and having a first male terminal portion formed thereon, and connected to the other of the pair of electrode fitting portions A second conductive member formed with a first female terminal portion into which a first male terminal portion of another connection cap is fitted, the pair of electrode fitting portions, the first conductive member, and the second A housing in which a conductive member is accommodated, wherein the first male terminal portion protrudes from one side in the arrangement direction of the housing, and the first female terminal portion extends in the arrangement direction with the first male terminal portion. Arranged side by side, the row of the housings Consists in connecting the cap, characterized in that it is exposed from an opening provided in direction other side.

  According to a second aspect of the present invention, a plurality of the first male terminal portions are formed on the first conductive member, and the same number of the first female terminals as the first male terminal portions are formed on the second conductive member. The terminal cap is formed, and the connection cap according to claim 1 exists.

  A third aspect of the present invention resides in the connection cap according to the first or second aspect, wherein the housing has a substrate having voltage detection means for detecting a voltage across the battery.

  According to a fourth aspect of the present invention, the housing includes a housing main body portion that accommodates the first conductive member and the second conductive member, and protrudes from the housing main body portion toward the electrode of the battery. The connection cap according to any one of claims 1 to 3, wherein a pair of projecting portions that respectively accommodate the joint portions are provided.

  The invention according to claim 5 further includes a third conductive member provided with a second male terminal portion and a second female terminal portion, respectively, and the second male terminal portion protrudes from one side in the arrangement direction of the housing, The second female terminal portion is arranged side by side in the arrangement direction of the second male terminal portions, and is exposed from an opening provided on the other side in the arrangement direction of the housing. Or the connection cap according to claim 1.

  As described above, according to the first aspect of the present invention, the first male terminal portion protrudes from one side of the housing arrangement direction, and the first female terminal portion is arranged in the arrangement direction with the first male terminal portion. Since the connection cap is attached to the battery and the batteries are stacked in the alignment direction, the connection cap attached to one of the adjacent batteries is not It is only necessary to fit one female terminal part and the first male terminal part of the connecting cap attached to the other, and it is not necessary to use a fixture. For this reason, it is possible to easily assemble a plurality of batteries and to reduce the number of assembled parts.

  According to the second aspect of the present invention, by providing a plurality of first male terminal portions and first female terminal portions, the assembly strength of the plurality of batteries can be improved, and electrical connection can be reliably performed.

  According to the third aspect of the present invention, since the housing has the substrate having the voltage detecting means for detecting the voltage across the battery, the voltage detection line for detecting the voltage across the battery is provided from each battery. There is no need to run around.

  According to the invention described in claim 4, since a space is formed between the pair of projecting portions when the connection cap is attached to the battery, the space is used as an air cooling duct or a gas exhaust tube is passed. Can do.

  According to the fifth aspect of the present invention, when the third conductive member is connected to one of the first and second conductive members of the connecting cap attached to the battery on the most one side in the arrangement direction, the third conductive member is connected. Can bring the electrode of the battery on the one side to the battery on the other side.

(A) is a top view of a connection cap, (B) is a bottom view of a connection cap. (A) is a side view on the one side in the alignment direction of the connection caps, and (B) is a side view on the other side in the alignment direction of the connection caps. It is a perspective view of a pair of electrode fitting part, the 1st conductive member, the 2nd conductive member, and the 3rd conductive member which constitute a connection cap. It is a top view of the assembled battery to which the connection cap shown in FIG.1 and FIG.2 is attached. It is a side view of the assembled battery which attached the connection cap shown in FIG.1 and FIG.2. It is a side view of the assembled battery which attached the connection cap shown in FIG.1 and FIG.2. It is a top view of the assembled battery which attached the connection cap shown in FIG.1 and FIG.2.

  Hereinafter, the connection cap of the present invention will be described with reference to FIGS. As shown in FIGS. 5 to 7, the connection cap 1 is attached to each of the plurality of unit cells 2 constituting the assembled battery. These unit cells 2 are provided in the same shape and the same size. As shown in FIG. 4, each of the plurality of unit cells 2 includes a box-shaped cell body 21, and a plus electrode 22 a and a minus electrode 22 b that protrude from the upper surface of the cell body 21.

  The plus electrode 22a and the minus electrode 22b are provided side by side in the electrode arrangement direction Y3. In the example shown in FIG. 4, the plus electrode 22a and the minus electrode 22b are formed in an elliptical column shape, but may have other shapes. The unit cells 2 are arranged such that the cell main bodies 21 are overlapped with each other along the protruding direction Y2 of the plus electrode 22a and the minus electrode 22b and the cell arranging direction Y1 orthogonal to the electrode arranging direction Y3. At this time, the unit cells 2 are arranged such that the plus electrodes 22a of the plurality of unit cells 2 are arranged in a line in the cell arrangement direction Y1, and the minus electrodes 22b of the plurality of unit cells 2 are arranged in a line along the cell arrangement direction Y1. Are arranged in layers.

  The plurality of connection caps 1 attached to the plurality of unit cells 2 described above are provided in the same shape and the same size. Each of the plurality of connecting caps 1 includes a pair of electrode fitting portions 3a and 3b fitted to the plus electrode 22a and the minus electrode 22b protruding from the unit cell 2, and the electrode fitting portion 3a as shown in FIG. A first conductive member 4 connected and formed with two first male terminal portions 4a; a second conductive member 5 connected to the electrode fitting portion 3b and formed with two first female terminal portions 5a; The third conductive member 6 provided with the second male terminal portion 6a and the second female terminal portion 6b respectively, and the pair of electrode fitting portions 3a and 3b, the first conductive member 4, the second conductive member 5 and the third And a housing 7 (such as FIGS. 1 and 2) in which the conductive member 6 is accommodated.

  The pair of electrode fitting portions 3a and 3b are made of a conductive member, and are provided in an elliptical cylindrical shape when viewed from above. An elliptical cylindrical plus electrode 22a and minus electrode 22b can be fitted into the pair of electrode fitting portions 3a and 3b. When fitted, the electrode fitting portion 3a is electrically connected to the plus electrode 22a, and the electrode fitting portion 3b is electrically connected to the minus electrode 22b. Further, as shown in FIG. 1 and the like, the inner surfaces of the electrode fitting portions 3a and 3b are convex along the protruding direction Y2 of the plus electrode 22a and the minus electrode 22b, and are arranged in a row in the inner circumference direction. The convex part is provided. The positive electrode 22a and the negative electrode 22b are press-fitted into the electrode fitting portions 3a and 3b by this convex portion, and the positive electrode 22a and the negative electrode 22b and the electrode fitting portions 3a and 3b are reliably electrically connected. The

  As shown in FIG. 3 and the like, the first conductive member 4 is entirely composed of a strip-shaped (bus bar-shaped) conductive member, and includes two first male terminal portions 4a, a connecting portion 4b, and an electrode fitting portion 3a. A connecting portion 4c to be connected. The two first male terminal portions 4a are provided in parallel to each other along the cell arrangement direction Y1, and are provided apart from each other in the electrode arrangement direction Y3. The connecting portion 4b is provided along the electrode arrangement direction Y3, and connects the other sides of the two first male terminal portions 4a in the cell arrangement direction Y1. The connecting portion 4c protrudes from the connecting portion 4b toward the other side of the cell arrangement direction Y1, and is connected to the upper surface of the electrode fitting portion 3a by, for example, welding. The connection portion 4c and the first male terminal portion 4a are provided on a straight line along the cell arrangement direction Y1.

  The second conductive member 5 has two first female terminal portions 5a, a connecting portion 5b, and a connecting portion 5c connected to the electrode fitting portion 3b. The two first female terminal portions 5a are provided in a rectangular tube shape penetrating in the cell arrangement direction Y1, and are provided apart from each other in the electrode arrangement direction Y3. The two first female terminal portions 5a are fitted with the first male terminal portions 4a of the other connecting caps 1 therein. Further, as shown in FIG. 2 (B) and the like, the first female terminal portion 5a has a plurality of convex portions that are convex along the cell arranging direction Y1 and arranged side by side along the inner peripheral direction, as shown in FIG. Is provided. The first male terminal portion 4a having a rectangular cross section of the other coupling cap 1 is press-fitted into the first female terminal portion 5a by this convex portion, and the first male terminal portion 4a and the first female terminal portion 5a of the other coupling cap 1 are pressed. Are securely connected electrically.

  The connecting portion 5b is provided in a belt shape along the electrode arrangement direction Y3, and connects one side of the two first female terminal portions 5a in the cell arrangement direction Y1. The connecting portion 5c protrudes from the connecting portion 5b toward one side in the cell arrangement direction Y1, and is connected to the upper surface of the electrode fitting portion 3b by, for example, welding. The connecting portion 5c and the first female terminal portion 5a on the negative side of the electrode arrangement direction Y3 are provided on a straight line along the cell arrangement direction Y1.

  The third conductive member 6 includes a strip-shaped second male terminal portion 6a and a square cylindrical second female terminal portion 6b arranged in the cell arrangement direction Y1. Since the 2nd female terminal part 6b is the same as the 1st female terminal part 5a mentioned above, detailed description is abbreviate | omitted. The third conductive member 6 is arranged on the side farther from the unit cell 2 in the protruding direction Y2 than the first conductive member 4 and the second conductive member 5 in order to insulate from the first conductive member 4 and the second conductive member 5. Is done.

  The housing 7 is made of an insulating member such as a synthetic resin, and accommodates the electrode fitting portions 3a and 3b, the first conductive member 4, the second conductive member 5 and the third conductive member 6 while being insulated from each other. Yes. The housing 7 is formed by, for example, insert molding in which the electrode fitting portions 3a and 3b, the first conductive member 4, the second conductive member 5, and the third conductive member 6 are inserted into a mold. At this time, as shown in FIG. 1 and the like, the first male terminal portion 4 a of the first conductive member 4 protrudes from one side of the housing 7 in the cell arrangement direction Y <b> 1.

  As shown in FIGS. 1 and 3, the first female terminal portion 5a of the second conductive member 5 is disposed along the cell arrangement direction Y1 with the first male terminal portion 4a. As shown, the housing 7 is exposed from the opening 7a provided on the other side of the cell arrangement direction Y1. Moreover, as shown in FIG. 1 etc., the 2nd male terminal part 6a protrudes from the cell arrangement | sequence direction Y1 one side of the housing 7. As shown in FIG. 2B, the second female terminal portion 6b is exposed from the opening 7b provided on the other side of the housing 7 in the cell arrangement direction Y1.

  As shown in FIGS. 1 and 2, the housing 7 has a substrate having a voltage detection IC 8a as a voltage detection means for detecting the voltage across the unit cell 2 on its upper surface (ie, the surface in the protruding direction Y2 side). The sub-substrate 8 is mounted. For example, the sub-substrate 8 is electrically connected to the first conductive member 4 and the second conductive member 5. The voltage detection IC 8 a detects the voltage between the first conductive member 4 and the second conductive member 5 as the voltage across the unit cell 2.

  The housing 7 includes a box-shaped housing main body 71 that houses the first conductive member 4, the second conductive member 5, and the third conductive member 6, and the positive electrode 22 a and the negative electrode of the unit cell 2 from the housing main body 71. A pair of projecting portions 72a and 72b that project toward the electrode 22b and accommodate the pair of electrode fitting portions 3a and 3b, respectively, are provided. As shown in FIG. 1B, the pair of electrode fitting portions 3a and 3b are exposed from the opening 7c provided on the protruding direction Y2 unit cell 2 side of the pair of protruding portions 72a and 72b.

  Next, the assembly procedure of the unit cell 2 using the connection cap 1 having the above-described configuration will be described. First, as shown in FIG. 6, the coupling cap 1 is attached to the upper surface of the unit cell 2 by fitting the plus electrode 22 a and the minus electrode 22 b of the unit cell 2 into the electrode fitting portions 3 and 3 b of the coupling cap 1. Install. The connecting cap 1 is attached in the same manner to each of all the unit cells 2 constituting the assembled battery. Next, as shown in FIG. 5, first, the two unit cells 2 are brought close to each other along the cell arranging direction Y1. FIG. 5 is a partial cross-sectional view.

  At this time, it is attached to the first female terminal portion 5a of the connection cap 1 attached to the unit cell 2 on one side (right side in FIG. 5) of the cell arrangement direction Y1 and to the unit cell 2 on the other side (left side in FIG. 5). The first male terminal portion 4a of the connected cap 1 is fitted. Accordingly, the first female terminal portion 5a of the connecting cap 1 attached to the unit cell 2 on one side of the cell arrangement direction Y1, and the first male terminal portion 4a of the connecting cap 1 attached to the unit cell 2 on the other side. Are electrically connected. As a result, the plus electrode 22a of the other unit cell 2 and the minus electrode 22b of the one unit cell 2 are electrically connected. That is, two unit cells 2 adjacent to each other are connected in series.

  Further, when two unit cells 2 are overlapped with each other, the connection cap attached to the second female terminal portion 6b of the connection cap 1 attached to the unit cell 2 on one side of the cell arrangement direction Y1 is attached to the unit cell 2 on the other side. The 1st 2nd male terminal part 6a is fitted. Accordingly, the second female terminal portion 6b of the connecting cap 1 attached to the unit cell 2 on one side of the cell arrangement direction Y1, and the second male terminal portion 6a of the connecting cap 1 attached to the unit cell 2 on the other side. Are electrically connected. As a result, the third conductive members 6 of the coupling caps 1 adjacent to each other are electrically connected to each other.

  Similarly, when a plurality of unit cells 2 are stacked, the plurality of unit cells 2 are connected in series, and the assembled battery is completed as shown in FIG. Then, as shown in FIG. 7, the 1st end plate 9 is attached to the connection cap 1 located in the most one side of the cell arrangement | sequence direction Y1. The first end plate 9 includes two third female terminal portions 9a and a fourth female terminal portion 9b that fit into the two first male terminal portions 4a and the second male terminal portion 6a, respectively, and a housing 9c that accommodates the third female terminal portions 9a and 9b. And. Since the 3rd female terminal part 9a and the 4th female terminal part 9b are the same as the 1st female terminal part 5a mentioned above, detailed explanation is omitted. The third female terminal portion 9a and the fourth female terminal portion 9b are electrically connected to each other by a strip-shaped connecting portion (not shown), and are exposed from the opening on the other side of the cell arrangement direction Y1 of the housing 9c.

  The first male terminal portion 4a and the second male terminal of the coupling cap 1 located on the most one side in the cell arrangement direction Y1 are connected to the third female terminal portion 9a and the fourth female terminal portion 9b of the first end plate 9, respectively. The first end plate 9 is attached by fitting the portion 6a. Thereby, the plus electrode 22a of the unit cell 2 located on the most one side in the cell arrangement direction Y1 passes through the first conductive member 4, the third female terminal portion 9a and the fourth female terminal portion 9b of the first end plate 9. Then, it is connected to the third conductive member 6. As described above, since the third conductive members 6 of the adjacent coupling caps 1 are connected to each other, the positive electrode 22a (total +) of the unit cell 2 located on the most side in the cell arrangement direction Y1 is connected to the cell arrangement direction. Y1 can be led to the second female terminal portion 6b of the connecting cap 1 attached to the unit cell 2 located on the most other side.

  Moreover, as shown in FIG. 7, the 2nd end plate 10 is attached to the connection cap 1 located in the othermost side of the cell arrangement | sequence direction Y1. The second end plate 10 includes two third male terminal portions 10a and a fourth male terminal portion 10b that are fitted into the two first female terminal portions 5a and the second female terminal portion 6b, respectively, and a housing that houses the third male terminal portion 10a and the fourth male terminal portion 10b. 10c. The housing 10c of the second end plate 10 further accommodates a pair of terminals (not shown) for supplying power to a load (not shown), one connected to the two third male terminal portions 10a and the other connected to the other. It is connected to the fourth male terminal portion 10b. Then, the first male terminal portion 5a and the second female terminal portion of the connection cap 1 located on the other side of the cell arrangement direction Y1 on the third male terminal portion 10a and the fourth male terminal portion 10b of the second end plate 10 When the second end plate 10 is attached by fitting 6b, assembly of the assembled battery is completed.

  According to the connection cap 1 described above, the first male terminal portion 4a connected to the plus electrode 22a of the unit cell 2 via the electrode fitting portion 3a protrudes from the one side of the cell arrangement direction Y1 of the housing 7, and the unit cell The first female terminal portion 5a connected to the second negative electrode 22b via the electrode fitting portion 3b is arranged side by side with the first male terminal portion 4a in the cell arrangement direction Y1, and the other cell arrangement direction Y1 of the housing 7 It is exposed from the opening 7a provided on the side. Thus, the first female terminal portion 5a of the connecting cap 1 attached to one of the adjacent unit cells 2 and the other when the connecting cap 1 is attached to the unit cell 2 and the unit cells 2 are arranged in the cell arrangement direction Y1. It is only necessary to fit the first male terminal portion 4a of the connection cap 1 attached to the connector cap 1, so that the assembly of the plurality of unit cells 2 can be facilitated and the number of assembly parts can be reduced.

  According to the connection cap 1 described above, the first conductive member 4 has two first male terminal portions 4a, and the second conductive member 5 has the same number of first female terminals as the first male terminal portions 4a. A terminal portion 5a is formed. Thus, by providing a plurality of first male terminal portions 4a and first female terminal portions 5a, the assembly strength of the plurality of unit cells 2 can be improved, and electrical connection can be reliably performed.

  Further, according to the connection cap 1 described above, the substrate 7 having the voltage detection IC 8a for detecting the voltage across the unit cell 2 is mounted on the housing 7, so that the voltage across the unit cell 2 can be detected. There is no need to route a voltage detection line from each unit cell 2.

  Further, according to the connection cap 1 described above, the housing 7 includes the housing main body 71 that houses the first conductive member 4, the second conductive member 5, and the third conductive member 6, and the unit cell 2 from the housing main body 71. A pair of projecting portions 72a and 72b that project toward the plus electrode 22a and the minus electrode 22b and accommodate the pair of electrode fitting portions 3a and 3b, respectively, are provided. As a result, as shown in FIG. 6, when the connection cap 1 is attached to the unit cell 2, there is a space between the pair of protrusions 72 a and 72 b and between the housing body 71 and the upper surface of the unit cell 2. Can be used as a duct for air cooling, or a gas exhaust tube can be passed through.

  Moreover, according to the connection cap 1 described above, the first conductive member 4 and the third conductive member 6 of the connection cap 1 attached to the unit cell 2 on the most one side in the cell arrangement direction Y1 by the first end plate 9 are connected. When connected, the third conductive member 6 can bring the plus electrode 22a (total +) of the unit cell 2 on the most side to the unit cell 2 on the other side.

  According to the embodiment described above, the two first male terminal portions 4a are formed on the first conductive member 4, but the present invention is not limited to this. As the first male terminal portion 4a, only one may be formed, or three or more may be formed.

  Further, according to the above-described embodiment, the electrode fitting portion 3a connected to the plus electrode 22a of the unit cell 2 is used as the first conductive member 4, and the electrode fitting portion 3b connected to the minus electrode 22b is used as the second conductive material. Although each member 5 is connected, the present invention is not limited to this. Conversely, the electrode fitting portion 3a connected to the plus electrode 22a of the unit cell 2 is connected to the second conductive member 5, and the electrode fitting portion 3b connected to the minus electrode 22b is connected to the first conductive member 4, respectively. May be.

  Further, according to the above-described embodiment, as shown in FIG. 7, the first conductive member 4 and the third conductive member of the coupling cap 1 attached to the unit cell 2 on the right side of the cell arrangement direction Y1 by the first end plate 9 as shown in FIG. Although the member 6 is connected, the present invention is not limited to this. Conversely, the second end plate 10 may connect the second conductive member 5 and the third conductive member 6 of the connection cap 1 attached to the unit cell 2 on the left side in the cell arrangement direction Y1.

  Moreover, according to embodiment mentioned above, the 2nd male terminal part 6a is also protruded from the surface of the side where the 1st male terminal part 4a of the housing 7 protrudes, and the 1st female terminal part 5a side is exposed. The second female terminal portion 6b is also exposed from the surface, but the present invention is not limited to this. Conversely, the second female terminal portion 6b is exposed from the surface of the housing 7 where the first male terminal portion 4a protrudes, and the second male terminal portion is exposed from the surface where the first female terminal portion 5a is exposed. You may make it make 6a protrude.

  Further, according to the embodiment described above, the first and second male terminal portions 4a and 6a are provided in a strip shape, and the first and second female terminal portions 5a and 6b are provided in a rectangular tube shape. It is not limited to this. The first and second male terminal portions 4a and 6a may have other known male terminal shapes, and the first and second female terminal portions 5a and 6b may include the first and second male terminal portions 4a. , 6a may be another Kochi female terminal.

  Further, the above-described embodiments are merely representative forms of the present invention, and the present invention is not limited to the embodiments. That is, various modifications can be made without departing from the scope of the present invention.

1 Connecting cap 2 Unit cell (battery)
3a Electrode fitting portion 3b Electrode fitting portion 4 First conductive member 4a First male terminal portion 5 Second conductive member 5a First female terminal portion 6 Third conductive member 6a Second male terminal portion 6b Second female terminal portion 7 Housing 8 Sub board (board)
8a Voltage detection IC (voltage detection means)
22a Positive electrode (electrode)
22b Negative electrode (electrode)
71 Housing body 72 Projection Y1 Cell alignment direction (alignment direction)

Claims (5)

It is a coupling cap that is attached to a plurality of batteries arranged along the arrangement direction and connects these batteries in series,
A pair of electrode fitting portions fitted to both electrodes protruding from the battery;
A first conductive member connected to one of the pair of electrode fitting portions and having a first male terminal portion formed thereon;
A second conductive member formed with a first female terminal portion connected to the other of the pair of electrode fitting portions and fitted with a first male terminal portion of another coupling cap;
A housing for accommodating the pair of electrode fitting portions, the first conductive member, and the second conductive member;
The first male terminal portion protrudes from one side in the arrangement direction of the housing;
The connection cap, wherein the first female terminal portion is arranged side by side in the arrangement direction with the first male terminal portion, and is exposed from an opening provided on the other side of the housing in the arrangement direction. A plurality of the first male terminal portions are formed on the first conductive member,
The connection cap according to claim 1, wherein the second conductive member has the same number of first female terminal portions as the first male terminal portions. The connection cap according to claim 1 or 2, wherein a substrate having voltage detection means for detecting a voltage across the battery is mounted on the housing. The housing includes a housing main body portion that accommodates the first conductive member and the second conductive member, and a pair of electrodes that protrude from the housing main body portion toward the electrode of the battery and accommodate the pair of electrode fitting portions, respectively. The protrusion part is provided. The connection cap in any one of Claims 1-3 characterized by the above-mentioned. A third conductive member provided with a second male terminal and a second female terminal, respectively,
The second male terminal portion protrudes from one side of the housing arrangement direction;
The said 2nd female terminal part is arrange | positioned along with the said alignment direction of the said 2nd male terminal part, and is exposed from the opening provided in the alignment direction other side of the said housing. The connection cap according to any one of the above.

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