JP2016018651A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack capable of directly extracting a midpoint potential between accumulator batteries to a circuit board without performing a wiring work, and of drastically reducing the number of components for wiring.SOLUTION: A plurality of first conduction support pillars 5A support between a pair of holding plates 3A and 3B, and a plurality of second conduction support pillars 5B are coupled to the first conduction support pillars 5A to support between one holding plate 3A and a circuit board 4. In a battery pack 1, connection tabs 6A-6E located at an intermediate part 22 where the cylindrical accumulator batteries 2A-2D are electrically connected in series and that are contacted with electrodes 21 of the cylindrical accumulator batteries 2A-2D, and a conductor part 41 in the circuit board 4 are conducted by means of the first conduction support pillars 5A and the second conduction support pillars 5B. The circuit board 4 is configured to measure a midpoint potential at the intermediate part 22 by using the first conduction support pillars 5A and the second conduction support pillars 5B.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a battery pack having a plurality of storage batteries arranged in parallel to each other.

  The battery pack is configured by holding a plurality of storage batteries arranged in parallel to each other on a holding plate, a case or the like. In many cases, the plurality of storage batteries are electrically connected in series. In this case, the intermediate potential between the storage batteries connected in series is measured, and the remaining capacity of the storage battery, overcharge / overdischarge, etc. The presence or absence of abnormal storage batteries is monitored. The battery pack is provided with a circuit board for measuring an intermediate potential between the storage batteries and taking out output from the plurality of storage batteries.

  For example, in the cell module of Patent Document 1, conductive columnar members that electrically connect bus bars set at the same potential adjacent in the stacking direction, and bus bars set at different potentials adjacent in the stack direction. Insulating columnar members that are electrically insulated are alternately connected in the stacking direction. A plurality of cell units are connected in series by the conductive columnar members.

JP 2004-31122 A

  By the way, in the battery pack, it is important how to attach a circuit board for measuring an intermediate potential between the storage batteries and taking out outputs from the plurality of storage batteries. This is because depending on how the circuit board is attached, not only does the work of wiring from the plurality of storage batteries to the circuit board take time, but also the number of parts for wiring increases. In patent document 1, there is no disclosure about how to attach the circuit board. Therefore, in order to simplify wiring work and reduce the number of parts for wiring, further contrivance is required.

  The present invention has been made in view of such a background. A battery that can directly extract an intermediate potential between storage batteries to a circuit board without performing wiring work, and can significantly reduce the number of parts for wiring. It was obtained by trying to provide a pack.

One aspect of the present invention is a plurality of storage batteries arranged in parallel to each other;
A pair of holding plates disposed opposite to both sides of the whole of the plurality of storage batteries;
A circuit board disposed opposite to the outside of at least one of the pair of holding plates;
A first conductive column having conductivity, which supports between the pair of holding plates;
A second conductive column supporting the gap between the holding plate and the circuit board and connected to the first conductive column;
An electrode of the storage battery or a connection tab contacting the electrode, located at an intermediate portion where the storage batteries are electrically connected in series by the first conduction post and the second conduction post, and a conductor on the circuit board Is connected to the
In the battery pack, the circuit board is configured to measure a potential in the intermediate portion by using the first conductive column and the second conductive column.

  In the said battery pack, the structure which connects a some storage battery to a circuit board is devised. Specifically, the potential (intermediate potential) at the intermediate portion between the plurality of storage batteries is taken out directly to the conductor portion of the circuit board by combining the first conductive column and the second conductive column. In order to take out the intermediate potential, it is not necessary to use wiring. Therefore, wiring work involving welding, soldering, and the like in the battery pack can be omitted or extremely simplified.

Further, the first conduction column has a function of supporting the pair of holding plates, and the second conduction column has a function of supporting the circuit board on the holding plate. Thereby, the circuit board can measure the intermediate potential between the plurality of storage batteries using the pair of holding plates and the first conduction column and the second conduction column that support the circuit board.
Therefore, according to the battery pack, the intermediate potential between the storage batteries can be directly drawn out to the circuit board without performing wiring work, and the number of parts for wiring can be significantly reduced.

1 is a perspective view showing a battery pack according to Example 1. FIG. 1 is a circuit diagram showing an electrical configuration of a battery pack according to Example 1. FIG. Sectional drawing which shows the periphery of the 1st conduction | electrical_connection support | pillar and 2nd conduction | electrical_connection support | pillar in a battery pack concerning Example 1. FIG. Sectional drawing which shows the periphery of the 3rd conduction | electrical_connection support | pillar and the 4th conduction | electrical_connection support | pillar in a battery pack concerning Example 1. FIG. FIG. 6 is a perspective view showing a battery pack according to a second embodiment.

A preferred embodiment of the battery pack described above will be described.
In the battery pack, the plurality of storage batteries are cylindrical storage batteries arranged in parallel to each other in the arrangement plane direction and having the electrodes on both end faces in the axial direction orthogonal to the arrangement plane direction, and the pair of holding plates Is arranged opposite to both end faces in the axial direction in the plurality of storage batteries, and the connection tab for electrically connecting the adjacent storage batteries is arranged on the electrode of the cylindrical storage battery. Even if the connection tab located in the intermediate portion where the storage batteries are electrically connected in series and the conductor portion in the circuit board are electrically connected by the first conduction column and the second conduction column. Good.
In this case, in the battery pack in which the plurality of cylindrical storage batteries are arranged, the intermediate potential at the connection tab is directly taken out to the conductor portion on the circuit board by the first conduction column and the second conduction column without using the wiring. be able to.

The plurality of storage batteries are laminated storage batteries arranged in parallel to each other in the stacking direction and having the electrodes in a direction orthogonal to the stacking direction, and the pair of holding plates are positioned at both ends in the stacking direction. The storage battery electrode is disposed opposite to the storage battery, and is positioned in an intermediate portion in which the storage batteries are electrically connected in series by the first conduction column and the second conduction column. The conductor part in the circuit board may be electrically connected.
In this case, in the battery pack in which a plurality of laminated storage batteries are arranged, the intermediate potential at the electrode of the storage battery is directly applied to the conductor portion on the circuit board by the first conduction post and the second conduction post without using the wiring. It can be taken out.

Moreover, the connection tab which contacts the electrode of the said storage battery or this electrode located in the edge part by which the said storage batteries are electrically connected in series, and the conductor part in the said circuit board are the 3rd conduction | electrical_connection support | pillars which have electroconductivity. The circuit board may be configured to take out the outputs of the plurality of storage batteries using the third conduction column.
In this case, the output of the storage battery can be directly taken out to the circuit board by the third conduction column without using the wiring.

Below, the example concerning a battery pack is described with reference to drawings.
As shown in FIG. 1, the battery pack 1 of this example includes a plurality of cylindrical storage batteries 2A to 2D, a pair of holding plates 3A and 3B, a circuit board 4, a plurality of first conduction posts 5A, and a plurality of second conduction posts. 5B is provided.
The plurality of cylindrical storage batteries 2A to 2D are arranged in parallel to each other. The pair of holding plates 3A and 3B are disposed so as to face both sides in the entire axial direction L of the plurality of cylindrical storage batteries 2A to 2D. The circuit board 4 is disposed to face the outside of the one holding plate 3A. The plurality of first conduction columns 5A are made of a conductive member, and are configured to support a pair of holding plates 3A and 3B. The plurality of second conductive columns 5 </ b> B are composed of conductive members, and are connected to the first conductive column 5 </ b> A so as to support between the one holding plate 3 </ b> A and the circuit board 4. .

  In battery pack 1, as shown in Drawing 1 and Drawing 2, it is located in intermediate part 22 where cylindrical storage batteries 2A-2D are electrically connected in series by the 1st conduction post 5A and the 2nd conduction post 5B. The connection tabs 6A to 6E that are in contact with the electrodes 21 of the cylindrical storage batteries 2A to 2D and the conductor portion 41 in the circuit board 4 are electrically connected. The circuit board 4 is configured to measure a potential at the intermediate portion 22 (hereinafter, referred to as an intermediate potential Vm) using the first conduction column 5A and the second conduction column 5B.

Hereinafter, the battery pack 1 of this example will be described in detail with reference to FIGS.
As shown in FIG. 1, the plurality of cylindrical storage batteries 2A to 2D of this example are arranged in parallel to each other in the arrangement plane direction, and cylindrical storage batteries having electrodes 21 on both end faces in the axial direction L perpendicular to the arrangement plane direction. It is. As shown in FIG. 2, in the battery pack 1 of this example, a plurality of cylindrical storage batteries 2 </ b> A to 2 </ b> D arranged in the vertical direction D are connected in series to form a series storage battery row 201. A plurality of series storage battery rows 201 are arranged in the horizontal direction W orthogonal to the vertical direction D and are connected in parallel to each other. The arrangement plane direction means a direction of a plane formed by the vertical direction D and the horizontal direction W.

The pair of holding plates 3A and 3B are disposed to face both end surfaces in the axial direction L of the plurality of cylindrical storage batteries 2A to 2D. A plurality of connection tabs 6A to 6E that electrically connect adjacent cylindrical storage batteries 2A to 2D are arranged on the electrodes 21 on both end faces of the cylindrical storage batteries 2A to 2D.
The plurality of connection tabs 6A to 6E include one end surface in the axial direction L of the plurality of cylindrical storage batteries 2A to 2D in which the plus side electrode 21 and the minus side electrode 21 are alternately arranged in the vertical direction D, and the other in the axial direction L. It arrange | positions so that several cylindrical storage battery 2A-2D may be connected in series with an end surface.

  As shown in FIGS. 1 and 2, in this example, four cylindrical storage batteries 2 </ b> A to 2 </ b> D constitute a series storage battery row 201. The plurality of connection tabs 6A to 6E are adjacent to the first connection tab 6A and the first tubular storage battery 2A disposed on one end surface of the first tubular storage battery 2A located at one end in the vertical direction D. A second connection tab 6B that connects the second cylindrical storage battery 2B at the other end surface in the axial direction L, and a second cylindrical storage battery 2B that is connected to the third cylindrical storage battery 2C adjacent thereto at one end surface in the axial direction L. The third connection tab 6C, the third cylindrical storage battery 2C and the fourth cylindrical storage battery 2D adjacent to the third connection tab 6C are connected to the other end face in the axial direction L at the other end face of the fourth connection tab 6D, the fourth cylindrical storage battery 2D. It is comprised as the 5th connection tab 6E arrange | positioned in this.

The 2nd-4th connection tab 6B-6D is located in the intermediate part 22 to which cylindrical storage battery 2A-2D is electrically connected in series. One end surface of each first conductive column 5A is in contact with the conductor portion 41 of the circuit board 4, and the other end surface of each first conductive column 5A is in contact with the second connection tab 6B or the fourth connection tab 6D.
Each connection tab 6A-6E of this example is connected to the electrode 21 in the both ends of the axial direction L of cylindrical storage battery 2A-2D by welding. In addition, each connection tab 6A-6E can also be set as the structure pressed down to the electrode 21 of cylindrical storage battery 2A-2D by elastic force, without welding to the electrode 21 of cylindrical storage battery 2A-2D. In this case, the connection tabs 6A to 6E can be provided with elastically deformable contact portions that contact the electrodes 21 of the cylindrical storage batteries 2A to 2D.

  As shown in FIGS. 1 and 3, the first conduction column 5 </ b> A is used for a portion connecting the second connection tab 6 </ b> B to the circuit board 4 and a portion connecting the fourth connection tab 6 </ b> D to the circuit board 4. Each first conduction column 5A has one end in the axial direction L in contact with one holding plate 3A and the other end in the axial direction L sandwiching the second connection tab 6B or the fourth connection tab 6D therebetween. Opposite 3B. Between the first connection tab 6A and the third connection tab 6C, and between the third connection tab 6C and the fifth connection tab 6E, the first conduction columns 5A are not brought into contact with the connection tabs 6A to 6E. A notch 61 is formed for passing through.

As shown in FIG. 3, screw holes 51 are formed on both end surfaces in the axial direction L of each first conduction column 5A, and one holding plate 3A is formed on one end surface of each first conduction column 5A. The male threaded portion 52 of the second conduction column 5B is screwed from the outer side surface, and the screw 53 is screwed to the other end surface of each first conduction column 5A from the outer side surface of the other holding plate 3B. In addition, each 1st conduction | electrical_connection support | pillar 5A can also be comprised with a long volt | bolt, a tie bolt, etc.
One end surface in the axial direction L of each second conductive column 5B connected to each first conductive column 5A is brought into contact with the conductor portion 41 of the circuit board 4 by a screw 53 screwed from the outer surface of the circuit board 4. Yes.

  As shown in FIGS. 1 and 4, the first connection tab 6 </ b> A and the fifth connection tab 6 </ b> E are electrically conductive third for taking out the output of the series storage battery row 201 by the plurality of cylindrical storage batteries 2 </ b> A to 2 </ b> D. A conductive column 5C is connected. The third conduction column 5 </ b> C is in contact with the first connection tab 6 </ b> A or the fifth connection tab 6 </ b> E and the conductor portion 41 on the circuit board 4. On the circuit board 4, the third conductive support column 5 </ b> C is positioned at the positive output V + of the first tubular storage battery 2 </ b> A located at one end of the series storage battery array 201 and the other end of the series storage battery array 201. The minus output V− of the fourth cylindrical storage battery 2D is taken out. Moreover, the 3rd connection tab 6C located in the intermediate part 22 with which cylindrical storage battery 2A-2D is electrically connected in series is connected to the conductor part 41 of the circuit board 4 by 4th conduction | electrical_connection support | pillar 5D.

  As shown in FIG. 2, the intermediate potential Vm between the first cylindrical storage battery 2A and the second cylindrical storage battery 2B is generated by the circuit board 4 by the second connection tab 6B, the first conduction column 5A, and the second conduction column 5B. Pulled out. Further, the intermediate potential Vm between the second cylindrical storage battery 2B and the third cylindrical storage battery 2C is drawn to the circuit board 4 by the third connection tab 6C and the fourth conduction column 5D. Further, the intermediate potential Vm between the third cylindrical storage battery 2C and the fourth cylindrical storage battery 2D is drawn to the circuit board 4 by the fourth connection tab 6D, the first conduction column 5A, and the second conduction column 5B.

Next, the effect of the battery pack 1 of this example is demonstrated.
In the battery pack 1 of this example, the intermediate potential Vm between the plurality of cylindrical storage batteries 2A to 2D is directly taken out to the conductor portion 41 in the circuit board 4 by combining the first conduction column 5A and the second conduction column 5B. ing. In order to extract the intermediate potential Vm, no wiring is used. Therefore, wiring work involving welding, soldering, and the like in the battery pack 1 can be omitted or extremely simplified. Also, defects such as welding and soldering are less likely to occur, and the problem of poor contact at the conductive portion is less likely to occur. Further, it is possible to improve the work efficiency of the assembly and the safety of the assembly.

The first conduction column 5A has a function of supporting the pair of holding plates 3A and 3B, and the second conduction column 5B has a function of supporting the circuit board 4 on the one holding plate 3A. Thereby, the circuit board 4 uses the first conduction column 5A and the second conduction column 5B that support the pair of holding plates 3A and 3B and the circuit substrate 4, and the intermediate potential between the plurality of cylindrical storage batteries 2A to 2D. Vm can be measured. Furthermore, the battery pack 1 can be reduced in size and weight by eliminating the wiring storage space, the space for connection work, and the like.
Therefore, according to the battery pack 1 of this example, the intermediate potential Vm between the cylindrical storage batteries 2A to 2D can be directly drawn out to the circuit board 4 without performing wiring work, and the number of parts for wiring can be reduced. In addition, wire saving can be achieved, and further, the battery pack 1 can be reduced in size and weight.

  In addition, the number of the cylindrical storage batteries 2A to 2D in the series storage battery row 201 can be arbitrarily set. Further, the second to fourth connection tabs 6B to 6D for extracting the intermediate potential Vm between the plurality of cylindrical storage batteries 2A to 2D connect the plurality of cylindrical storage batteries 2A, 2B, 2C or 2D arranged in the horizontal direction W in parallel. In addition, a plurality of cylindrical storage batteries 2A to 2D arranged in the vertical direction D may be connected in series. In this case, the plurality of cylindrical storage batteries 2A to 2D connected in parallel are further connected in series, and the output current of the battery pack 1 can be increased.

(Example 2)
This example is an example of the battery pack 10 configured using the laminate-type storage batteries 7A to 7D.
As shown in FIG. 5, a plurality of laminated storage batteries (hereinafter simply referred to as storage batteries) 7A to 7D of the present example are arranged in parallel to each other in the stacking direction M and a pair of electrodes 71A in a direction orthogonal to the stacking direction M. -71D, 72A-72D. The pair of holding plates 3A and 3B in this example are arranged to face the storage batteries 7A and 7D located at both ends in the stacking direction M. The pair of electrodes 71A to 71D and 72A to 72D in the plurality of storage batteries 7A to 7D are drawn out to one side in the planar direction of the storage batteries 7A to 7D.
The positions where the plus side electrodes 71A to 71D and the minus side electrodes 72A to 72D are provided in the plurality of storage batteries 7A to 7D are appropriately different.

  The first conduction column 5A of the present example is divided into a plurality of electrodes in order to connect the electrodes 72A, 71B (72B, 71C or 72C, 71D) arranged in the stacking direction M in the plurality of storage batteries 7A-7D. Yes. 5 A of 1st conduction | electrical_connection pillars 72A, 71B (72B, 71C or 72C, 72C, between the support | pillar part 54 which connects one holding plate 3A and electrode 72A (72B or 72C) of storage battery 7A-7D, and storage battery 7A-7D. 71D) and a column portion 56 that connects the electrode 71B (71C or 71D) of the storage batteries 7A to 7D and the other holding plate 3B. And the male screw part screwed together in a screw hole or a screw hole is formed in the both end surfaces of each support | pillar part 54-56.

  As shown in FIG. 5, the first conduction column 5A includes a negative electrode 72A of the first storage battery 7A located at the end of the circuit board 4 in the stacking direction M, and a second storage battery adjacent to the first storage battery 7A. 7B connecting the positive side electrode 71B, connecting the negative side electrode 72B of the second storage battery 7B to the positive side electrode 71C of the third storage battery 7C adjacent to the second storage battery 7B, and the third storage battery 7C There is one that connects the negative electrode 72C and the positive electrode 71D of the fourth storage battery 7D adjacent to the third storage battery 7C.

  The first conduction column 5A is supported between the pair of holding plates 3A and 3B, and the second conduction column 5B is connected to the first conduction column 5A so that the one opposing plate 3A and the circuit board 4 are connected. And is supported between. And, by the first conduction column 5A and the second conduction column 5B, the intermediate potential Vm between the first storage battery 7A and the second storage battery 7B, the intermediate potential Vm between the second storage battery 7B and the third storage battery 7C, The intermediate potential Vm between the third storage battery 7 </ b> C and the fourth storage battery 7 </ b> D is extracted to the conductor portion 41 in the circuit board 4.

  Further, as shown in FIG. 5, the positive electrode 71A of the first storage battery 7A is connected to the fifth conduction column 5E supported between the pair of holding plates 3A and 3B and the fifth conduction column 5E. This is connected to a positive output V + provided on the conductor portion 41 of the circuit board 4 by a sixth conduction column 5F supported between the holding plate 3A and the circuit board 4. The negative electrode 72D of the fourth storage battery 7D is connected to the fifth conduction column 5E supported between the pair of holding plates 3A and 3B and the fifth conduction column 5E, and the one holding plate 3A and the circuit board. 4 is connected to the negative output V− provided on the conductor portion 41 of the circuit board 4 by the sixth conduction column 5 </ b> F supported therebetween.

  The fifth conduction column 5E includes a column part 57 that connects one holding plate 3A and the electrode 71A (72D) of the storage battery 7A (7D), 71A (72D) between the electrodes of the storage battery 7A (7D), and the other holding plate 3B. And a column portion 58 that connects the two. The pair of holding plates 3A and 3B in this example is also supported by a support column 59 for increasing rigidity. Further, on both end surfaces of each of the column portions 57 and 58 and the column 59, screw holes or male screw portions that are screwed into the screw holes are formed.

  Similarly to the first embodiment, the battery pack 10 of this example can directly draw the intermediate potential Vm between the cylindrical storage batteries 7A to 7D to the circuit board 4 without performing wiring work. The score can be significantly reduced. Also in this example, the other configurations and the reference numerals in the drawings are the same as those in the first embodiment, and the same effects as those in the first embodiment can be obtained.

DESCRIPTION OF SYMBOLS 1 Battery pack 2A-2D Cylindrical storage battery 21 Electrode 22 Intermediate | middle part 3A, 3B Holding plate 4 Circuit board 41 Conductor part 5A 1st conduction | electrical_connection support | pillar 5B 2nd conduction | electrical_connection support | pillar 5C 3rd conduction | electrical_connection support 6A-6E Connection tab Vm Intermediate potential

Claims (4)

A plurality of storage batteries arranged in parallel to each other;
A pair of holding plates disposed opposite to both sides of the whole of the plurality of storage batteries;
A circuit board disposed opposite to the outside of at least one of the pair of holding plates;
A first conductive column having conductivity, which supports between the pair of holding plates;
A second conductive column supporting the gap between the holding plate and the circuit board and connected to the first conductive column;
An electrode of the storage battery or a connection tab contacting the electrode, located at an intermediate portion where the storage batteries are electrically connected in series by the first conduction post and the second conduction post, and a conductor on the circuit board Is connected to the
The battery pack, wherein the circuit board is configured to measure a potential at the intermediate portion using the first conduction column and the second conduction column. The plurality of storage batteries is a cylindrical storage battery that is arranged in parallel to each other in the arrangement plane direction and has the electrodes on both end faces in the axial direction orthogonal to the arrangement plane direction.
The pair of holding plates are arranged to face both end surfaces in the axial direction in the plurality of storage batteries,
The connection tab for electrically connecting the storage batteries adjacent to each other is disposed on the electrode of the cylindrical storage battery,
The connection tab located in an intermediate portion where the storage batteries are electrically connected in series and the conductor portion of the circuit board are electrically connected to each other by the first conduction column and the second conduction column. The battery pack according to claim 1. The plurality of storage batteries are laminated storage batteries that are arranged parallel to each other in the stacking direction and have the electrodes in a direction orthogonal to the stacking direction,
The pair of holding plates are arranged to face the storage battery located at both ends in the stacking direction,
The electrode of the storage battery and the conductor part of the circuit board, which are located in an intermediate part where the storage batteries are electrically connected in series, are electrically connected by the first conduction post and the second conduction post. The battery pack according to claim 1. The storage battery electrode or the connection tab contacting the electrode, which is located at the end where the storage batteries are electrically connected in series, and the conductor portion of the circuit board are electrically connected by a third conductive support column having electrical conductivity. Has been
The said circuit board is comprised so that the output of these storage batteries may be taken out using the said 3rd conduction | electrical_connection support | pillar, The battery pack as described in any one of Claims 1-3 characterized by the above-mentioned.

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