JP2015153486A - Connection member and power storage module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To simplify assembly of a power storage module.SOLUTION: A connection member 20 is attached to a power storage element group 10 obtained by arranging a plurality of power storage elements 11 each having positive and negative electrode lead terminals 12A and 12B at a side edge, and electrically connects the plurality of power storage elements 11. The connection member 20 has: a plurality of terminal holding parts 22 into which the lead terminals 12A and 12B are inserted and held; a metal member 33 attached to the terminal holding part 22 and configured to connect between the adjacent lead terminals 12A and 12B; and a guide part 29 for guiding the lead terminals 12A and 12B to the terminal holding part 22.

Description

  The present invention relates to a connection member and a power storage module.

  In a battery module formed by connecting a plurality of battery cells, the battery cells are connected by joining thin lead wires by ultrasonic welding or the like (see, for example, Patent Document 1).

  In the case of connection by ultrasonic welding, since the joint portion is sandwiched from above and below, joining is difficult when the stacking interval of the battery cells is narrow. Therefore, after arranging the battery cells in a desired connection state (series, parallel) and joining the lead wires together, the battery cells are stacked to form a stack, and the stack is disposed in the case. Assembling the battery module was done.

JP 2012-227120 A

Like the battery module described in Patent Document 1, if a welding process is required in which battery cells are lined up and the lead wires are ultrasonically welded before lamination, there is a problem that it takes time to assemble the battery module. .
An object of this invention is to simplify the assembly of an electrical storage module.

  In order to solve the above-described problem, the present invention provides a connection for electrically connecting a plurality of power storage elements attached to a power storage element group in which a plurality of power storage elements having positive and negative lead terminals on one side edge are arranged. A plurality of terminal holding portions for inserting and holding the lead terminals; a metal member attached to the terminal holding portion for connecting adjacent lead terminals; and the lead terminals for the terminals. And a guide part that guides the holding part.

  Moreover, this invention is an electrical storage module provided with the electrical storage element group which arranges the several electrical storage element which has a lead terminal of a positive electrode and a negative electrode on one side edge, and the connection member attached to the said electrical storage element group.

  In the present invention, the lead terminal of the storage element in a stacked state is guided to the terminal holding part by the guide part and then inserted into the terminal holding part. The lead terminal inserted through the terminal holding part is connected to a metal member attached to the terminal holding part and is electrically connected to an adjacent lead terminal via the metal member.

  In other words, in the present invention, since the lead terminal guided to the terminal holding portion to which the metal member is attached can be connected to the metal member while being held by the terminal holding portion, the assembly of the power storage module is smooth. It can be done. As a result, according to the present invention, the assembly of the power storage module can be simplified.

The present invention may have the following configurations.
The guide part may be constituted by a member different from the holding member on which the terminal holding part is formed.
With such a configuration, since the guide portion can be configured by another member having a structure that matches the connection state (series or parallel) of the storage element, the holding member is shared regardless of the connection state of the storage element. be able to.

The metal member may be composed of two kinds of metal materials.
With such a configuration, when the lead terminals of the positive electrode and the negative electrode are made of different metal materials, it is possible to select a metal material suitable for the lead terminals to be connected, and it is possible to cope with laser welding.

A cutting line that can be cut according to the number of the power storage elements to be connected may be formed.
With such a configuration, there is no need to make a mold for each number of connected storage elements.

  According to the present invention, the assembly of the power storage module can be simplified.

The perspective view of the electrical storage module of Embodiment 1 Plan view of power storage module Front view of power storage module Rear view of power storage module Side view of power storage module The perspective view of the electrical storage element group which shows a mode that the metal member was attached Front view of power storage element group showing a state where a metal member is attached Side view of power storage element group with metal member attached Perspective view of storage element group Perspective view of storage element Perspective view of metal member Front view of metal member Side view of metal member Front view of holding member Front view of holding member before cutting The perspective view which showed the holding member from the back side The perspective view which showed the guide member from the front side Rear view of guide member The perspective view which showed the member for connection from the back side Front view of connecting member Plan view of connecting member The perspective view of the electrical storage module of Embodiment 2. Plan view of power storage module Front view of power storage module Rear view of power storage module Side view of power storage module The perspective view of the electrical storage element group to which the metal member was attached Side view of power storage element group with metal member attached The perspective view which showed the guide member from the front side Rear view of guide member The perspective view which showed the member for connection from the back side Front view of connecting member The perspective view of the electrical storage module of Embodiment 3. Plan view of power storage module Front view of power storage module Rear view of power storage module Side view of power storage module The perspective view of the electrical storage element group to which the metal member was attached Front view of power storage element group to which metal member is attached Side view of power storage element group with metal member attached The perspective view which showed the guide member from the front side Rear view of guide member The perspective view which showed the member for connection from the back side Front view of connecting member The perspective view of the metal member demonstrated by other embodiment Side view of the metal member of FIG. The top view of the metal member demonstrated by other embodiment 47 is a side view of the metal member of FIG.

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS. In the following description, the lower side in FIG. 2 is the front, the upper side is the rear, the upper side in FIG. 3 is the upper side, and the lower side is the lower side. About a several same member, a code | symbol may be attached | subjected to one member and a code | symbol may be abbreviate | omitted about another member. The power storage module M1 of the present embodiment is used as a power storage module M1 for, for example, an integrated starter generator (ISG).

(Electric storage module M1)
1 to 5, the power storage module M1 includes a power storage element group 10 in which a plurality of power storage elements 11 (six power storage elements 11 in the present embodiment) are arranged, and one end (front end) of the power storage element group 10. And a connecting member 20 attached to the part).

  The power storage element group 10 is formed by stacking a plurality of power storage elements 11 as shown in FIGS. In this embodiment, the power storage element group 10 is formed by stacking power storage elements 11 adjacent in the stacking direction so that lead terminals 12A and 12B having different polarities overlap each other, and are connected in series.

(Storage element 11)
As shown in FIG. 10, each power storage element 11 has positive and negative lead terminals 12A and 12B on one side edge. Specifically, each power storage element 11 includes a power storage element (not shown), a laminate film 13 that wraps the power storage element and has a side edge welded thereto, and is connected to the power storage element and is welded from one side edge to which the laminate film 13 is welded. Lead terminals 12A and 12B led in the direction.

(Lead terminals 12A, 12B)
In this embodiment, the positive lead terminal 12A is made of aluminum or aluminum alloy, and the negative lead terminal 12A is made of copper or copper alloy.

  As shown in FIG. 8, in each power storage element 11, the negative electrode lead terminal 12B is bent upward, and the positive electrode lead terminal 12A is bent downward. Lead terminals 12 </ b> A and 12 </ b> B having different polarities of adjacent power storage elements 11 are connected via a metal member 33. The negative lead terminal 12B of the uppermost storage element 11 is bent upward and connected to the external connection member 15, and the positive lead terminal 12A of the lowermost storage element 11 is bent downward and connected to the external connection member 15. Has been. Lead terminals 12 </ b> A and 12 </ b> B that are electrically connected to adjacent power storage elements 11 are connected to metal member 33 by laser welding.

(External connection member 15)
The external connection member 15 connected to the uppermost power storage element 11 is a negative electrode terminal 15A that functions as the negative electrode of the power storage module M1, and the external connection member 15 connected to the lowermost power storage element 11 is connected to the power storage module M1. This is a positive electrode terminal 15B that functions as a positive electrode.

  The external connection member 15 that functions as a negative electrode is made of copper or a copper alloy, and the external connection member 15 that functions as a positive electrode is made of aluminum or an aluminum alloy. A portion where the circular hole of the external connection member 15 is formed is a terminal portion 16 connected to an external device.

(Connecting member 20)
A connection member 20 that is attached to the electricity storage element group 10 and electrically connects the electricity storage element 11 is attached to the terminal holding portion 22 and a plurality of terminal holding portions 22 that hold the lead terminals 12A and 12B inserted therethrough. And a metal member 33 for connecting the adjacent lead terminals 12A and 12B, and a guide portion 29 for guiding the lead terminals 12A and 12B to the terminal holding portion 22.

  In the connection member 20 of the present embodiment, the terminal holding portion 22 and the guide portion 29 are provided as separate members. Specifically, the connecting member 20 is a holding member 21 provided with a terminal holding portion 22, a separate member from the holding member 21, a guide member 28 provided with a guide portion 29, and a metal member 33. And comprising.

(Metal member 33)
The metal member 33 has a plate shape as shown in FIGS. 11 and 12, and the length thereof is set to be longer than the length of the lead terminals 12A and 12B in the longitudinal direction (left and right direction in FIG. 2). . The metal member 33 is attached to the terminal holding part 22 of the holding member 21. Locking holes 34 that are locked to the holding member 21 are formed at both ends in the longitudinal direction of the metal member 33.

  Further, as shown in FIG. 13, the metal member 33 has a U shape when viewed from the side, and is made of two kinds of metal materials. Specifically, the metal member 33 includes a first metal part made of copper or a copper alloy arranged on the upper side in FIG. 13 and a second metal part made of aluminum or an aluminum alloy arranged on the lower side in FIG. . The metal member 33 can be manufactured by a known method such as cold welding.

  The first metal portion of the metal member 33 is disposed so as to contact the positive lead terminal 12A, and the second metal portion of the metal member 33 is disposed so as to contact the negative lead terminal 12B, and each of the metal portions 33A, 33B. Is connected to each lead terminal 12A, 12B by laser welding.

(Holding member 21)
The holding member 21 is made of an insulating resin material and has a plate shape as shown in FIGS. 14 and 16. As shown in FIG. 15, the holding member 21 (connection member 20) is formed with a cutting line 21 </ b> A that can be cut according to the number of power storage elements 11 to be connected. FIG. 15 shows the holding member 21 before cutting.

  As shown in FIG. 14, the holding member 21 is provided with slit-like terminal holding portions 22 that hold the lead terminals 12 </ b> A and 12 </ b> B inserted in two rows by seven. In the present embodiment, among the terminal holding portions 22 in the left column of FIG. 3, the uppermost terminal holding portion 22 and the lowermost terminal holding portion 22 hold the external connection member 15 and the lead terminals 12A and 12B.

  Among the terminal holding portions 22, the third and fifth terminal holding portions 22 from the top of the left column, the second from the top, the fourth from the top, and the sixth terminal holding portion 22 from the top of the right row A metal member 33 is attached. In the terminal holding part 22, the lead terminals 12 </ b> A and 12 </ b> B are stacked and held on the upper side and the lower side of the metal member 33, respectively.

  U-shaped U-shaped protrusions 23 are provided at both ends of the terminal holding portion 22 on the front surface (front-side surface) of the holding member 21. On the inner wall of the U-shaped protrusion 23, a locking convex portion 24 that fits into the locking hole 34 of the metal member 33 and locks the metal member 33 is formed.

  A columnar columnar protrusion 25 to which a guide member 28 is attached is provided at the end of the terminal holding portion 22 on the rear surface (rear surface side) of the holding member 21, and the guide member 28 is provided on the columnar protrusion 25. A mounting hole 26 is provided for receiving the mounting projection 30 formed in the above.

(Guide member 28)
The guide member 28 is attached to the rear surface of the holding member 21 with the surface (front surface) shown in FIG. 17 facing forward. A mounting protrusion 30 is provided on the front surface of the guide member 28.

  The surface of the guide member 28 on the side shown in FIG. 18 is a surface disposed on the back side, and a guide portion 29 is formed to guide the lead terminals 12A and 12B and the external connection member 15 to predetermined positions. The guide portion 29 has an inclined surface shape (see FIG. 17).

  The guide member 28 of the present embodiment is formed at a position where the guide portion 29 is shifted on the left side and the right side in the stacking direction (vertical direction in FIG. 17).

  When the guide member 28 is attached to the holding member 21, a slit-like through hole 31 is formed in a portion where the lead terminals 12A and 12B and the external connection member 15 are to be disposed. The lead terminals 12 </ b> A and 12 </ b> B are guided by the guide portion 29 of the guide member 28, and are arranged in the corresponding terminal holding portions 22 through the slit-like through holes 31.

(Assembly method of power storage module M1 of this embodiment)
The six power storage elements 11 are stacked so that the lead terminals 12A and 12B adjacent in the stacking direction have opposite polarities to produce the power storage element group 10, and the metal member 33 is attached to the front side of the holding member 21.
Next, when the mounting protrusion 30 of the guide member 28 is fitted into the mounting hole 26 of the holding member 21 and the guide member 28 is attached to the holding member 21, the connecting member 20 as shown in FIGS. 19 to 21 is obtained. .

  Next, the electrical storage element group 10 is attached from the rear surface (surface on the back side) of the connection member 20. When the storage element group 10 is arranged on the rear surface of the connection member 20 and the lead terminals 12A and 12B are inserted through the terminal holding portions 22 of the connection member 20, the lead terminals 12A and 12B are provided on the guide member 28. The lead terminals 12 </ b> A and 12 </ b> B of the adjacent power storage elements 11 can be electrically connected via the metal member 33 through the slit-like through holes 31 while being guided by the portions 29, arranged in the corresponding terminal holding portions 22. (See FIG. 3).

  Next, after inserting and attaching the external connection member 15 from the front side of the connection member 20, the lead terminals 12A and 12B and the metal member 33, and the external connection member 15 and the lead terminals 12A and 12B are joined by laser welding, respectively. As shown in FIG. 1, the power storage module M1 of the present embodiment is obtained.

(Operation and effect of this embodiment)
Next, the operation and effect of this embodiment will be described.
In the present embodiment, the lead terminals 12 </ b> A and 12 </ b> B of the storage element 11 in the stacked state are guided to the terminal holding part 22 by the guide part 29 and then inserted into the terminal holding part 22. The lead terminals 12A and 12B inserted through the terminal holding part 22 are connected to the metal member 33 attached to the terminal holding part 22 and electrically connected to the adjacent lead terminals 12A and 12B via the metal member 33. . That is, in the present embodiment, the lead terminals 12A and 12B guided to the terminal holding part 22 to which the metal member 33 is attached can be connected to the metal member 33 while being held by the terminal holding part 22. Therefore, the power storage module M1 can be assembled smoothly. As a result, according to the present embodiment, the assembly of the power storage module M1 can be simplified.

  Further, according to the present embodiment, since the guide portion 29 is formed of a member different from the holding member 21 on which the terminal holding portion 22 is formed, the guide portion 29 is connected to the storage element 11 ( Since it can be comprised with another member provided with the structure match | combined with the serial and parallel), the holding member 21 can be shared irrespective of the connection state of the electrical storage element 11. FIG.

  Further, according to the present embodiment, since the metal member 33 is composed of two kinds of metal materials, the lead terminals 12A to be connected when the positive and negative electrode lead terminals 12A, 12B are made of different metal materials. , 12B can be selected, which is suitable for laser welding.

  In addition, according to the present embodiment, the holding member 21 is formed with cutting lines 21A that can be cut in accordance with the number of power storage elements 11 to be connected. There is no need to make.

<Embodiment 2>
Next, a second embodiment of the present invention will be described with reference to FIGS. The power storage module M2 of the present embodiment is different from that of the first embodiment in the connection method of the power storage elements 11 and the configuration of the guide member 42 (guide portion 43). The lower side in FIG. 23 is the front, the upper side is the rear, the upper side in FIG. 24 is the upper side, and the lower side is the lower side. About a several same member, a code | symbol may be attached | subjected to one member and a code | symbol may be abbreviate | omitted about another member. The same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 22 to 26, the power storage module M <b> 2 includes a power storage element group 10 and a connection member 41 attached to one end (front end) of the power storage element group 10. The power storage element group 10 is formed by stacking a plurality of power storage elements 11 as shown in FIGS. 27 and 28.

  In the present embodiment, the power storage element group 10 is formed by stacking two adjacent power storage elements 11 in the stacking direction so that the lead terminals 12A and 12A (or 12B and 12B) having the same polarity are arranged at overlapping positions. Connected in parallel.

  Specifically, the uppermost (top) power storage element 11 and the second power storage element 11 from the top are stacked so that the lead terminals 12A and 12A (12B and 12B) having the same polarity overlap each other. The fourth storage element 11 and the fourth storage element 11 from the top are stacked such that lead terminals 12A, 12A (12B, 12B) of the same polarity overlap each other, and the fifth storage element 11 and the bottom stage ( The sixth storage element 11 from the top is laminated so that the lead terminals 12A and 12A (12B and 12B) having the same polarity overlap each other. The second storage element 11 from the top and the third storage element 11 from the top are stacked so that the lead terminals 12A and 12B having opposite polarities overlap each other, and the third storage element 11 from the top and 4 from the top are stacked. The lead terminals 12 </ b> A and 12 </ b> B having the opposite polarity to the second power storage element 11 are stacked so as to overlap each other.

  The lead terminals 12A and 12B are bent so that they can be connected to the adjacent lead terminals 12A and 12B in the stacking direction, and the lead terminals 12A and 12A (12B and 12B) connected in parallel are arranged so as to contact each other. ing.

  The holding member 21 is the same as that of the first embodiment, but the position where the metal member 33 is attached is different. Among the terminal holding portions 22 of the holding member 21, metal members 33 are attached to the fifth terminal holding portion 22 from the top of the left side row and the third terminal holding portion 22 from the top of the right side row (see FIG. 24). In the terminal holding part 22, two lead terminals 12 </ b> A and 12 </ b> B are stacked and held on the upper side and the lower side of the metal member 33.

  As shown in FIGS. 29 to 31, the guide member 42 attached to the holding member 21 has a symmetrical shape. The guide portion 43 is provided at a symmetrical position. In the figure, reference numeral 44 denotes a mounting convex portion 44.

  When the guide member 42 is attached to the holding member 21, a slit-like through hole 45 is formed in a portion where the lead terminals 12A and 12B and the external connection member 15 are to be disposed. The lead terminals 12 </ b> A and 12 </ b> B are guided by the guide portion 43 of the guide member 42, and are arranged in the corresponding terminal holding portions 22 through the slit-like through holes 45.

  Since other configurations are substantially the same as those in the first embodiment, the same effects as those in the first embodiment can be obtained in this embodiment.

<Embodiment 3>
Next, a third embodiment of the present invention will be described with reference to FIGS. The power storage module M3 of the present embodiment is different from that of the first embodiment in the connection method of the power storage elements 11 and the configuration of the guide member 52 (guide portion 53). The lower side in FIG. 34 is the front, the upper side is the rear, the upper side in FIG. 35 is the upper side, and the lower side is the lower side. About a several same member, a code | symbol may be attached | subjected to one member and a code | symbol may be abbreviate | omitted about another member. The same components as those in the first embodiment are denoted by the same reference numerals, and redundant description is omitted.

  As shown in FIGS. 33 to 37, the power storage module M <b> 3 includes the power storage element group 10 and a connection member 51 attached to one end (front end) of the power storage element group 10. The power storage element group 10 is formed by stacking a plurality of power storage elements 11 as shown in FIGS. 38 to 40.

  In the present embodiment, the power storage element group 10 is formed by stacking three adjacent power storage elements 11 in the stacking direction so that the lead terminals 12A and 12A (12B and 12B) having the same polarity are arranged at overlapping positions. Connected in parallel.

  Specifically, the uppermost (top) power storage element 11, the second power storage element 11 from the top, and the third power storage element 11 from the top have lead terminals 12A, 12A, 12A (12B, 12B, 12B having the same polarity). ) Are stacked so as to overlap each other, and the fourth storage element 11 from the top, the fifth storage element 11 from the top, and the storage element 11 at the bottom (sixth from the top) have the same polarity lead terminals 12A, 12A , 12A (12B, 12B, 12B) are stacked so as to overlap each other. The third power storage element 11 from the top and the fourth power storage element 11 from the top are stacked so that the lead terminals 12A and 12B having opposite polarities overlap each other.

  The lead terminals 12A and 12B are bent so as to be connectable to the adjacent lead terminals 12A and 12B in the stacking direction, and the lead terminals 12A, 12A and 12A (12B, 12B and 12B) connected in parallel are arranged so as to contact each other. (See FIG. 40).

  The holding member 21 is the same as that of the first embodiment, but the position where the metal member 33 is attached is different. Of the terminal holding portions 22 of the holding member 21, a metal member 33 is attached to the fourth terminal holding portion 22 from the top in the right column. In the terminal holding part 22, two lead terminals 12 </ b> A and 12 </ b> B are stacked and held on the upper side and the lower side of the metal member 33.

  The guide member 52 attached to the holding member 21 is provided with a guide portion 53 at the upper end portion and the lower end portion of the left side row shown in FIGS. 41 and 42 and at the approximate center of the right side row. In the figure, reference numeral 54 denotes a mounting convex portion 54.

  When the guide member 52 is attached to the holding member 21, a slit-like through hole 55 is formed in a portion where the lead terminals 12A and 12B and the external connection member 15 are to be disposed. The lead terminals 12 </ b> A and 12 </ b> B are guided by the guide portion 53 of the guide member 52, and are arranged in the corresponding terminal holding portions 22 through the slit-like through holes 55.

  Since other configurations are substantially the same as those in the first embodiment, the same effects as those in the first embodiment can be obtained in this embodiment.

<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) In the above-described embodiment, an example in which the guide portion 29 is configured by a member (guide member 52) different from the holding member 21 on which the terminal holding portion 22 is formed has been described. The terminal holding part may be formed as one member.
(2) In the above embodiment, the example in which the metal member 33 is made of two kinds of metal materials has been shown. However, the metal member may be made of one kind of metal material, or made of three or more kinds of metal materials. It may be.
(3) In the above embodiment, the metal member 33 made of a metal material which is U-shaped and is different between the upper side and the lower side is shown. For example, as shown in FIGS. 45 and 46, two different metal materials are bonded together. 47, 48, or a metal member 70 made of a different metal material on the left and right sides in the longitudinal direction. 45A to 48B, 60A and 70A are first metal portions, 60B and 70B are second metal portions, and 61 and 71 are locking holes that are locked to the terminal holding portions.
(4) In the above embodiment, the holding member 21 that can be cut for each unit in which the seven terminal holding portions 22 are arranged in two rows is shown, but the formation position of the cutting line 21A is not limited to this. A cutting line may be formed for each of 1 to 6 terminal holding parts, a cutting line may be formed for every 8 or more terminal holding parts, or a holding member that does not include a cutting line. Good.
(5) Although the power storage element group 10 including the six power storage elements 11 is shown in the above embodiment, the number of power storage elements is not limited to this. It may be a power storage element group composed of seven or more power storage elements, or a power storage element group composed of five or less power storage elements.
(6) In the above embodiment, the lead terminals 12A and 12B and the metal member 33 are connected by laser welding. However, the lead terminal and the metal member may be connected by a method other than laser welding. .

DESCRIPTION OF SYMBOLS 10 ... Power storage element group 11 ... Power storage element 12A ... Positive electrode lead terminal 12B ... Negative electrode lead terminal 20, 41, 51 ... Connection member 21 ... Holding member 21A ... Cutting line 22 ... Terminal holding part 23 ... U-shaped protrusion 24 ... Locking convex part 25 ... Columnar protrusion 26 ... Mounting hole 28, 42, 52 ... Guide member 29, 43, 53 ... Guide part 30, 44, 54 ... Mounting convex part 31, 45, 55 ... Through hole 33, 60 , 70 ... Metal members 33A, 60A, 70A ... First metal part 33B, 60B, 70B ... Second metal part 34 ... Locking hole M1, M2, M3 ... Power storage module

Claims (5)

A connecting member that is attached to a power storage element group in which a plurality of power storage elements having a positive electrode and a negative electrode lead terminal on one side edge are arranged to electrically connect the plurality of power storage elements,
A plurality of terminal holding portions for inserting and holding the lead terminals;
A metal member attached to the terminal holding portion and connecting the adjacent lead terminals;
And a guide part for guiding the lead terminal to the terminal holding part. The connection member according to claim 1, wherein the guide portion is formed of a member different from the holding member on which the terminal holding portion is formed. The connection member according to claim 1, wherein the metal member is made of two kinds of metal materials. The connection member according to any one of claims 1 to 3, wherein a cutting line that can be cut in accordance with the number of the storage elements to be connected is formed. 5. A power storage element group in which a plurality of power storage elements each having a positive electrode and a negative electrode lead terminal are arranged on one side edge, and the connection member according to claim 1 attached to the power storage element group. A power storage module comprising:

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