JP2014220101A - Power storage module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage module which prevents connection failures of a lead terminal and a connection member, and a short circuit.SOLUTION: A power storage module 10 is constituted by laminating a plurality of power storage units constituted by arranging power storage elements 23, 24, 25 having a container 26 for housing power storage elements, and lead terminals 27A, 27B connected to power storage elements and led out from an edge of the container 26, side by side. Lead terminals 27A, 27B of laterally adjacent power storage elements 23, 24, 25 are covered by a lead cover 51 made of an insulation material in a condition that lead terminals are connected to conductive members 33, 38.

Description

  The present invention relates to a power storage module.

  Secondary batteries such as lithium ion batteries and nickel metal hydride batteries are known as examples of power storage elements in which power storage elements are housed. Secondary batteries, such as a lithium ion battery, comprise an electrical storage module by connecting two or more. As such a power storage module, for example, the one described in Patent Document 1 is known.

JP2013-12458A

  Patent Document 1 discloses a power storage module in which a plurality of flat-shaped power storage elements in which positive and negative lead terminals protrude from end portions are stacked. In this power storage module, power storage elements adjacent in the stacking direction are connected in series by connecting lead terminals having different polarities (reverse polarities).

  In the power storage module, the power storage elements are stacked and connected in the vertical direction, but it is also possible to stack a plurality of power storage units in which a plurality of power storage elements are arranged side by side and connected in series or in parallel.

  The power storage module having such a configuration is assembled by stacking a plurality of power storage units in which a plurality of power storage elements are arranged side by side and the lead terminals of the power storage elements adjacent in the arrangement direction are connected by a connecting member such as a bus bar.

  However, if the lead terminals are stacked in an exposed state, a short circuit occurs due to contact with a connection member other than the connection member to which the lead terminals are connected or another member made of a conductive material. There was a fear. In addition, there is a risk that poor connection between the lead terminal and the connection member may occur due to rattling of the connection member connected to the lead terminal.

  This invention is completed based on the above situations, Comprising: While preventing a short circuit, it aims at providing the electrical storage module which prevented the poor connection of a lead terminal and a connection member.

  The present invention provides a power storage unit comprising a plurality of power storage elements arranged side by side having a container in which a power storage element is accommodated and a lead terminal connected to the power storage element and led out from an edge of the container. A plurality of stacked power storage modules, wherein the lead terminals of the power storage elements adjacent in the lateral direction are covered with a lead cover made of an insulating material while being connected to a connection member.

  In the present invention, the lead terminals of the plurality of power storage elements arranged side by side are covered with a lead cover made of an insulating material while being connected to the connection member. Therefore, in the present embodiment, the cover that covers the lead terminal can prevent contact between the lead terminal and a connecting member other than the connecting member to which the lead terminal is connected or a member made of another conductive material. In addition, rattling of the connecting member connected to the lead terminal can be prevented. As a result, according to the present invention, it is possible to provide a power storage module that prevents a short circuit and prevents a connection failure between the lead terminal and the connection member.

The present invention may have the following configuration.
The lead cover may be formed with a pressing protrusion that presses a connection portion between the lead terminal and the connection member.
With such a configuration, the rattling of the connecting member can be surely prevented, so that the effect of preventing poor connection between the lead terminal and the connecting member is enhanced.

The pressing protrusion may be provided for each lead terminal.
With such a configuration, the effect of preventing poor connection between the lead terminal and the connection member is further enhanced.

A holding member that holds the lead terminal and the connection member may be provided, and the lead cover may be provided with a locked structure that is locked to the holding member.
With such a configuration, the lead cover is prevented from being displaced, so that the effect of preventing a short circuit and the effect of preventing a connection failure between the lead terminal and the connection member can be further ensured.

  ADVANTAGE OF THE INVENTION According to this invention, while preventing a short circuit, the electrical storage module which prevented the connection defect of a lead terminal and a connection member can be provided.

The perspective view of the electrical storage module of Embodiment 1 Perspective view of laminate Top view of the lowest power storage unit Top view of the lowermost power storage unit with the cover removed The perspective view which shows the some electrical storage element of a lowermost electrical storage unit, a 1st conductive member, and a 2nd conductive member Sectional drawing in the AA line of FIG. Sectional drawing in the BB line of FIG. Perspective view of heat transfer member Sectional view taken along line CC in FIG. 9 is a partially enlarged sectional view of FIG. Lead cover perspective view Side view of lead cover Back view of lead cover

<Embodiment 1>
A first embodiment of the present invention will be described with reference to FIGS.
The power storage module 10 according to the present embodiment is used for an integrated starter generator (ISG) of a vehicle such as an automobile. In the following description, the left side in FIG.

(Power storage module 10)
As shown in FIG. 1, the power storage module 10 has a substantially rectangular parallelepiped shape as a whole, and a plurality of power storage units 22 (22A, 22B, 22C, 22D, 22E, and 22F in order from the bottom) in a substantially rectangular parallelepiped case 11. ) Are stacked, and the terminals 30 and 32 of the stacked body 21 pass through the case 11 and are led out to the outside.

(Case 11)
The case 11 includes a cylindrical case main body 12 in which the laminated body 21 is disposed, and a closing member 19 that closes the front and rear openings 14 of the case main body 12.

  The case body 12 is made of metal, and includes a box-shaped lower case 13 in which the stacked body 21 is accommodated, and an upper case 15 that covers the lower case 13.

The lower case 13 is open at the top and front and partly open at the rear.
A fastening hole (not shown) for penetrating and fastening the bolt 17 </ b> A through which the laminated body 21 is penetrated is formed in the peripheral edge portion of the bottom surface of the lower case 13.

  The upper case 15 has a substantially rectangular shape, and a heat radiating surface 16 that is recessed in a step shape is formed on the inner side of the case 11, and the inner surface of the heat radiating surface 16 is the uppermost power storage layer. By contacting the power storage elements 23, 24, 25 in the unit 22 </ b> F, the heat of the power storage elements 23, 24, 25 is dissipated to the outside through the heat radiation surface 16.

Fastening holes for fastening with bolts 17 </ b> A and nuts 17 </ b> B are formed through the upper corners of the upper case 15.
A locking hole 18 for locking the closing member 19 is formed at the front end of the upper case 15.

  The closing member 19 is made of synthetic resin and has a shape that fits into the front and rear openings 14 of the case 11. The front side closing member 19 (the rear closing member is not shown) has terminals 30, A terminal outlet 20 for leading 32 to the outside of the case 11 is formed. On the upper surface of the closing member 19, a locking projection (not shown) that is fitted into the locking hole 18 is formed.

(Laminate 21)
As shown in FIG. 2, the stacked body 21 is formed by stacking a plurality of (in this embodiment, six layers) power storage units 22 </ b> A, 22 </ b> B, 22 </ b> C, 22 </ b> D, 22 </ b> E, 22 </ b> F (hereinafter “22A-22F”). It is configured.

(Electric storage units 22A to 22F)
The power storage units 22A to 22F are stacked so that the front and rear directions of the power storage units 22A to 22F adjacent to each other in the vertical direction are opposite to each other. Each of the power storage units 22A to 22F is electrically connected to a plurality (three) of power storage elements 23, 24, and 25 having lead terminals 27A and 27B and a positive electrode lead terminal 27A of the power storage elements 23, 24, and 25. 1 terminal portion 29, second terminal portion 31 electrically connected to negative electrode lead terminal 27 </ b> B of power storage elements 23, 24, 25, and positive terminal lead of first terminal portion 29 and power storage elements 23, 24, 25. A first conductive member 33 that connects the terminal 27A in parallel; a second conductive member 38 that connects the second terminal portion 31 and the negative electrode lead terminals 27B of the storage elements 23, 24, and 25 in parallel; A synthetic resin holding member 43 for holding the storage elements 23, 24, and 25, and a plate disposed along the bottom surface of the storage elements 23, 24, and 25 to dissipate the heat of the storage elements 23, 24, and 25 to the outside Heat transfer member 52 Provided.

(Storage element 23, 24, 25)
The plurality of power storage elements 23, 24, and 25 all have the same configuration, and are flat-type laminated batteries as shown in FIG. The plurality of power storage elements 23, 24, and 25 are arranged in a row on the same plane (along a flat surface) and arranged in a row (side by side) to form a power storage element array. A slight gap is provided between the adjacent power storage elements 23, 24, 25.

  Each of the electricity storage elements 23, 24, and 25 includes a container 26 made of a laminate film 28 in which an electricity storage element (not shown) is accommodated and an end portion is welded (joined), and a positive electrode led out from an end edge 28A of the container 26. And negative lead terminals 27A and 27B.

  Although the details are not shown, the laminate film 28 constituting the container 26 is obtained by laminating a resin layer on the outside of the metal foil. Examples of the metal foil include aluminum foil, and examples of the resin layer include polyethylene terephthalate and nylon. A heat welding layer made of polyethylene, polypropylene, or the like is provided inside the metal foil (on the electricity storage element side).

  Of the edges 28A, 28B of the laminate film 28, the edge 28B along the longitudinal direction is bent toward the container body 26A as shown in FIG.

  Positive and negative lead terminals 27A and 27B are led out from one end edge 28A along the short side of the end edges 28A and 28B of the laminate film 28, respectively. Specifically, at one end edge 28A in the short direction of the laminate film 28, the positive and negative electrode lead terminals 27A and 27B are joined in a state of being sandwiched between the end edges 28A of the laminate film 28 arranged one above the other. ing.

(Connection structure between power storage units 22A to 22F)
As shown in FIG. 3, the first terminal portion 29 is the positive electrode terminal 30 of the entire power storage module 10 for the lowermost layer (first layer) power storage unit 22 </ b> A. ). The first terminal portions 29 of the power storage units 22B, 22C, 22D, 22E, and 22F in the other layers (2 to 6 layers from the bottom) are adjacent to the power storage units 22A, 22B, 22C, 22D, and 22E in the vertical direction (stacking direction). The second terminal portion 31 is connected.

  As shown in FIG. 2, the first terminal portion 29 and the second terminal portion 31 of different layers are connected to the first connecting terminal 42 formed by bending a thin metal plate (copper plate or the like) into a crank shape. The first terminal portion 29 and the second terminal portion 31 of different layers are connected by ultrasonic welding to both the terminal portion 29 and the second terminal portion 31.

  The 2nd terminal part 31 connects with the 1st terminal part 29 of 2-6 layers of electrical storage units 22B, 22C, 22D, 22E, 22F about the 1-5 layers of electrical storage units 22A, 22B, 22C, 22D, 22E. Is done. As shown in FIG. 2, the second terminal portion 31 of the uppermost power storage unit 22F is the negative terminal 32 of the entire power storage module 10, and is connected to a terminal (not shown) of an external electric wire terminal. .

  The first terminal portion 29 and the second terminal portion 31 are connected by the first conductive member 33, the power storage elements 23, 24, 25, and the second conductive member 38, whereby the power storage elements 23, 24 are connected. , 25, a plurality of (three in this embodiment) shunt paths are formed.

  The first conductive member 33 (an example of a connecting member) and the second conductive member 38 (an example of a connecting member) are formed by punching a metal plate material and bending it, for example, pure aluminum or aluminum alloy. And made of a conductive material such as copper or copper alloy. In the following description, “conductive members 33, 38” means “first conductive member 33 and second conductive member 38”.

  As shown in FIGS. 4 and 5, the first conductive member 33 </ b> A of the lowermost power storage unit 22 </ b> A is formed integrally with the first terminal portion 29 and the first terminal portion 29, and is a flat plate connected to the first terminal portion 29. The first conductive member main body 35 is branched so as to connect the first terminal portion 29 and the positive electrode lead terminals 27A of the power storage elements 23, 24, and 25 in parallel. And a plurality of (three) first branch paths.

  The first terminal portion 29 is formed at a height different from that of the first conductive member body 35 by bending the end portion of the first conductive member body 35 into a crank shape.

  The first conductive member main body 35 extends from the first terminal portion 29 to the left and right along the direction in which the power storage elements 23, 24, and 25 are arranged, and is slightly formed by the bent portion 34 that is bent in a step shape on the path. The height is changed, and the connecting portions 36A, 36B, which are connected to the positive electrode lead terminals 27A of the three power storage elements 23, 24, 25 on one side edge portion in the extending direction before the bent portion 34, respectively. 36C is formed.

  Also in the other power storage units 22B, 22C, 22D, 22E, and 22F, connection portions connected to the positive electrode lead terminals 27A of the three power storage elements 23, 24, and 25, respectively, at the tip of the bent portion 34 of the first conductive member 33. 36A, 36B, and 36C are formed.

  Of the upper surface of the first conductive member 33 of the power storage unit 22, a predetermined range extending along the direction in which the power storage elements 23, 24, and 25 are aligned (region where the second conductive member 38 overlaps) is from other members. An insulating sheet 60 for insulating the first conductive member 33 is attached.

  As shown in FIGS. 4 and 5, the second conductive member 38 </ b> A of the lowermost power storage unit 22 </ b> A includes a second terminal portion 31 and a second conductive member main body 40 formed integrally with the second terminal portion 31. The second conductive member main body 40 has a plurality of (three) second branches branched so as to connect the second terminal portion 31 and the negative terminal 27B of each of the storage elements 23, 24, 25 in parallel. Has a branch.

  The second conductive member main body 40 has a portion extending from the second terminal portion 31 to the left and right along the direction in which the power storage elements 23, 24, and 25 are arranged, and the power storage element 23, Connection portions 41A, 41B, 41C connected to the negative terminal 27B of 24, 25 are formed. The height of the second conductive member main body 40 is slightly changed by a bent portion 39 that is bent in a step shape on the path.

  In other power storage units 22B, 22C, 22D, 22E, and 22F, connection portions 41A, 41B, and 41C connected to the negative electrode lead terminals 27B of the three power storage elements 23, 24, and 25, respectively, are formed. Of the upper surface of the second conductive member 38, a predetermined range extending in the direction in which the power storage elements 23, 24, and 25 are aligned (a region where the first conductive member 33 overlaps) is between the first conductive member 33 and the first conductive member 33. An insulating sheet 60 (not shown) for insulating the film is affixed.

  The end holding members 49A and 49B are respectively formed with holding claws 37 for holding the power storage units 22A to 22F stacked above. The first conductive member 33 and the second conductive member 38 are held across a center holding member 44 and end holding members 49A and 49B, which will be described later.

(Heat transfer member 52)
The heat transfer member 52 is a plate-like member having a size corresponding to the size of the center holding member 44 and the end holding members 49A and 49B. For example, the heat transfer member 52 is a metal heat conductive material such as aluminum or aluminum alloy. Consists of.

  On a pair of side edges in the longitudinal direction of the heat transfer member 52, as shown in FIG. 8, a plurality of (four) standing walls 53 are formed at an interval. The standing wall 53 is disposed so as to contact the inner wall surface of the case 11 when the laminated body 21 is accommodated in the case 11, and has a function of conducting heat generated from the power storage elements 23, 24, and 25 to the case 11. Have. Heat generated from the power storage elements 23, 24, and 25 is transmitted to the case 11 through the standing wall 53 and is radiated to the outside of the case 11.

  Two attachment pieces 54 for attaching the end holding members 49A and 49B are formed on the pair of side edges in the short direction of the heat transfer member 52 so as to protrude. Each attachment piece 54 is formed with an attachment hole 54A for attaching the end holding members 49A and 49B.

  As shown in FIGS. 6 and 8, the heat transfer member 52 is formed such that the central region 52B is higher than the side edge region 52A on the near side and the side edge region 52C on the back side.

  In the central region 52B of the heat transfer member 52, a holding member mounting hole 57 for locking the mounting piece 44A of the central holding member 44 is formed (see FIG. 6). Three power storage elements 23, 24, and 25 are placed on the partition portion 46 of the central holding member 44 attached to the central region 52 </ b> B of the heat transfer member 52 so that the flat surfaces are in contact with the heat transfer member 52. Is held in the state.

  The central region 52B of the heat transfer member 52 is formed to be higher than the side edge region 52A on the near side and the side edge region 52C on the back side in FIG. An edge 28A from which the lead terminals 27A and 27B of the laminate film 28 are led out is arranged along a step 59 portion between the central region 52B of the heat transfer member 52 and the side edge region 52A on the near side. It has become. The step 59 between the central region 52B of the heat transfer member 52 and the side edge region 52A on the near side is configured to recede in a direction away from the end edge 28A from which the lead terminals 27A and 27B of the laminate film 28 are led out.

  The step 59 of the heat transfer member 52 includes a bent portion 59A formed by bending in a direction away from the end edge 28A from which the lead terminals 27A and 27B of the container 26 of the electricity storage elements 23, 24, and 25 are led out. The bent portion 59A has a function of preventing a short circuit due to contact between the metal foil exposed at the edge 28A of the container 26 from which the lead terminals 27A and 27B are led out and the heat transfer member 52.

  A side edge region 52A on the near side in FIG. 8 of the heat transfer member 52 is a region where the conductive member holding portion 45 that holds the first conductive member 33 and the second conductive member 38 is disposed, and the central holding member 44 is Holding member fixing holes 55 for fixing are provided at both ends.

  The lead terminals 27A, 27B of the power storage elements 23, 24, 25 are arranged in the side edge region 52A on the near side in FIG. 8 of the heat transfer member 52, and the positive electrodes of the power storage elements 23, 24, 25 are arranged. An insertion hole 56 for inserting a sandwiching member (not shown) for sandwiching and connecting the lead terminal 27A and the connection portions 36A, 36B, 36C of the first conductive member 33, and the storage elements 23, 24, 25 An insertion hole 56 is provided through which a sandwiching member is inserted for sandwiching and connecting the negative electrode lead terminal 27B and the connecting portions 41A, 41B, 41C of the second conductive member 40.

(Holding member 43)
The holding member 43 is made of an insulating material such as a synthetic resin. As shown in FIG. 3, the holding member 43 is arranged on the left and right (front and rear) of the central holding member 44 arranged on the heat transfer member 52 and the heat transfer member 52. End holding members 49A and 49B are provided.

  The end holding members 49 </ b> A and 49 </ b> B extend to the left and right of the heat transfer member 52 along the plate surface of the heat transfer member 52, and the first conductive member 33 and the second conductive member 38 are fitted and held on the upper surface. .

  The left and right side edges of the central holding member 44 in FIG. 3 project a fixing portion 47 that is superimposed on the end holding members 49A and 49B, and the fixed protrusion 47 that protrudes from the upper surface of the central holding member 44. 50, the center holding member 44 and the end holding members 49A and 49B are fixed.

  The central holding member 44 includes a partition portion 46 that is rectangularly partitioned to hold the power storage elements 23, 24, and 25 inside, and a conductive member holding portion 45 that holds the conductive members 33 and 38. Prepare.

  In each partition portion 46, the power storage elements 23, 24, and 25 can be fitted side by side. An attachment piece 44 </ b> A that is locked to the holding member attachment hole 57 of the heat transfer member 52 is provided in the partition portion 46 so as to protrude downward.

  Between the partition part 46 and the conductive member holding part 45, lead terminals 27A and 27B of the power storage elements 23, 24, and 25 are arranged, and a long shape is formed on the lead terminals 27A and 27B so as to cover the lead terminals 27A and 27B. The lead cover 51 (details will be described later) is covered (see FIG. 3).

  As shown in FIGS. 9 and 10, a contact suppressing portion 48 is provided between the partition portion 46 and the conductive member holding portion 45. The contact suppressing portion 48 is provided at a position corresponding to the hole edge portion 56 </ b> A of the insertion hole 56 of the heat transfer member 52 in the region between the partition portion 46 and the conductive member holding portion 45.

  The contact suppressing portion 48 is formed at an opening 48A formed slightly smaller than the insertion hole 56 at a position corresponding to the insertion hole 56 of the heat transfer member 52, and protrudes downward from the lower side surface of the opening 48A. And a hole edge covering portion 48B disposed along the outer surface of the hole edge portion 56A of the insertion hole 56 of the member 52.

  The size and position of the opening 48 </ b> A are set so that the lip portion of the opening 48 </ b> A covers the entire circumference of the hole edge 56 </ b> A of the insertion hole 56 of the heat transfer member 52. The height dimension X of the hole edge covering part 48B of the contact suppressing part 48 is set larger than the thickness dimension Y of the heat transfer member 52 in the hole edge part 56A (see FIG. 10).

  The contact suppressing portion 48 of the central holding member 44 is fitted into the insertion hole 56 of the heat transfer member 52 to form one hole. For example, an anvil (an example of a sandwiching member) used in ultrasonic welding is formed in this hole. It is possible to insert the horn on the lead terminals 27A and 27B and connect the conductive members 33 and 38 and the lead terminals 27A and 27B.

  In the operation of connecting the first conductive member 33 and the positive electrode lead terminal 27A and connecting the second conductive member 38 and the negative electrode lead terminal 27B, the clamping member inserted through the hole formed by the opening 48A and the insertion hole 56 Is in contact with the contact suppressing portion 48 covering the hole edge portion 56A of the insertion hole 56 of the heat transfer member 52, but does not directly contact the hole edge portion 56A of the insertion hole 56 of the heat transfer member 52. Therefore, the heat transfer member 52 and the lead terminals 27A and 27B are not easily short-circuited.

  On both sides of the opening 48A of the central holding member 44, protective walls 61 are provided on both sides of the lead terminals 27A and 27B to insulate and protect the lead terminals 27A and 27B. One protective wall 61 is provided between the lead terminals 27A, 27B led out from one power storage element 23, 24, 25, and the lead terminals 27A, 27A led out from the adjacent power storage elements 23, 24, 25 are provided. Two protective walls 61 are provided between 27B.

  Among the protective walls 61, the protective walls 61A disposed at both ends and the protective wall 61B disposed adjacent thereto are connected to the connecting portions 36A and 36C of the first conductive member 33 and the second conductive member 38. Conductive member fixing claws 62 for fixing 41A and 41C are provided.

  A cover locking hole 63 (an example of a locking structure) for locking the fixing claw 51A of the lead cover 51 is formed in the protective wall 61C arranged third from the end.

  An insulating sheet 60 provided between the adjacent power storage elements 23, 24, and 25 and disposed between the third protective wall 61C from the end portion and the fourth protective wall 61D from the end portion and disposed on the conductive member holding portion 45. Insulating member locking claws 64 are formed to prevent the screws from coming off.

(Lead cover 51)
The lead cover 51 is made of an insulating material and covers the lead terminals 27 </ b> A and 27 </ b> B of the power storage elements 23, 24, and 25 adjacent in the lateral direction in a state of being connected to the conductive members 33 and 38.
On the lower surface of the lead cover 51, there are pressing protrusions 51B for holding the connecting portions 36A, 36B, 36C, 41A, 41B, 41C between the lead terminals 27A, 27B and the conductive members 33, 38 for each of the lead terminals 27A, 27B. It protrudes downward. The pressing protrusion 51B has a rectangular shape.

  The lead cover 51 has a first protective wall insertion hole 51C into which the second protective wall 61B from the end is inserted, and a second protective wall insertion hole 51D into which the third protective wall 61C from the end is inserted. Is provided. The protective walls 61 </ b> A disposed at both ends are respectively disposed outside the lead cover 51.

  Below the second protective wall insertion hole 51D provided in the lead cover 51, a fixing claw 51A that is locked to the cover locking hole 63 of the protective wall 61C is provided to project (an example of a locked structure). .

  A rectangular receiving hole 51E for receiving the insulating member locking claw 64 is formed at a position adjacent to the second protective wall insertion hole 51D of the lead cover 51, and the end of the partition 46 of the central holding member 44 is formed. A receiving groove 51F is formed. The three protective walls 61 at the center are arranged below the lead cover 51.

(Assembly method of power storage unit 22)
After the end holding members 49 </ b> A and 49 </ b> B are attached to and integrated with the heat transfer member 52, the center holding member 44 is attached to the heat transfer member 52 in an overlapping manner. Insulating sheets 60 are provided in the regions closer to the connecting portions 36A, 36B, and 36C than the bent portion 34 of the first conductive member 33 and in the regions closer to the connecting portions 41A, 41B, and 41C than the bent portion 39 of the second conductive member 38, respectively. Paste it. On the heat transfer member 52 to which the end holding members 49A and 49B and the center holding member 44 are attached, the second conductive member 38 having the insulating sheet 60 attached thereto, and the first conductive member 33 having the insulating sheet 60 attached thereto, Are attached in order, the region where the insulating sheet 60 of the conductive members 33 and 38 is pasted is locked by the insulating member locking claws 64, and the connecting portions 36A, 36B and 36C of the first conductive member 33 and the second conductive member The 38 connecting portions 41A, 41B, 41C are locked by the conductive member fixing claws 62.

  Next, the storage elements 23, 24, and 25 are fitted into the partition portions, and the positive lead terminals 27 of the storage elements 23, 24, and 25 are connected to the connection portions 36A, 36B, and 36C of the first conductive member 33 by ultrasonic welding. Then, the negative electrode lead terminal 27B of the electricity storage elements 23, 24, 25 is connected to the connection portions 41A, 41B, 41C of the second conductive member 38 by ultrasonic welding. As a result, the positive lead terminals 27A of the three power storage elements 23, 24, and 25 are connected to the connecting portions 36A, 36B, and 36C of the first conductive member 33, respectively, and the negative lead terminals 27B are connected to the connecting portions 41A of the second conductive member 38, respectively. , 41B, 41C.

  Next, when the lead cover 51 is put on the lead terminals 27A, 27B of the electricity storage elements 23, 24, 25, the fixing claws 51A of the lead cover 51 are locked in the cover locking holes 63 provided in the protective wall 61, The lead cover 51 is prevented from being detached from the central holding member 44, and the lead terminals 27 </ b> A and 27 </ b> B are pressed by the pressing protrusion 51 </ b> B of the lead cover 51 while being connected to the conductive members 33 and 38. .

(Function and effect)
According to this embodiment, the following operations and effects are achieved.
In the present embodiment, the lead terminals 27A, 27B of the plurality of power storage elements 23, 24, 25 arranged side by side are covered with a lead cover 51 made of an insulating material while being connected to the conductive members 33, 38. Therefore, in the present embodiment, the lead terminals 27A and 27B and the conductive members 33 and 38 other than the conductive members 33 and 38 to which the lead terminals 27A and 27B are connected are covered by a cover that covers the lead terminals 27A and 27B. Contact with a member made of a conductive material can be prevented, and rattling of the conductive members 33 and 38 connected to the lead terminals 27A and 27B can be prevented. As a result, according to the present embodiment, it is possible to provide the power storage module 10 that prevents a short circuit and prevents poor connection between the lead terminals 27A and 27B and the conductive members 33 and 38.

  Further, according to the present embodiment, the lead cover 51 has the pressing protrusions 51B for pressing the connecting portions 36A, 36B, 36C, 41A, 41B, 41C between the lead terminals 27A, 27B and the conductive members 33, 38. Since it is provided for each 27B, the effect of preventing poor connection between the lead terminals 27A and 27B and the conductive members 33 and 38 is enhanced.

  Furthermore, according to the present embodiment, the central holding member 44 that holds the lead terminals 27A and 27B and the conductive members 33 and 38 is provided, and the lead cover 51 is provided with the fixing claw 51A that is locked to the central holding member 44. As a result, the lead cover 51 is prevented from being displaced, and the short-circuit prevention effect and the connection failure prevention effect between the lead terminals 27A and 27B and the conductive members 33 and 38 can be further ensured.

<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, the pressing protrusions 51B for pressing the connecting portions 36A, 36B, 36C, 41A, 41B, 41C between the lead terminals 27A, 27B and the conductive members 33, 38 are provided for the lead terminals 27A, 27B. However, the pressing protrusions may not be provided for each lead terminal. Moreover, you may provide the lead cover in which the pressing protrusion is not provided.
(2) In the above embodiment, the lead cover 51 is provided with the fixed claw 51A, and the lead cover 51 is provided with the cover holding hole 63 that locks the fixed claw 51A with the central holding member 44. The lead cover may be provided with a locking hole, and the holding member may be provided with a locking claw, or may be configured without a locked structure.
(3) In the above embodiment, the example in which the power storage elements 23, 24, and 25 are batteries has been described. However, the power storage element may be a capacitor or the like.
(4) In the said embodiment, although it was set as the electrical storage module 10 for ISG, you may use for the electrical storage module of another use.

DESCRIPTION OF SYMBOLS 10 ... Power storage module 21 ... Laminated body 22 ... Power storage unit 22A-22F ... Power storage unit 23, 24, 25 ... Power storage element 26 ... Container (laminate film)
27A (positive electrode) lead terminal 27B (negative electrode) lead terminal 33 ... first conductive member (connection member)
35 ... 1st electroconductive member main body 36A, 36B, 36C ... Connection part (with positive electrode lead terminal) 38 ... 2nd electroconductive member (connection member)
40 ... 2nd conductive member main body 41A, 41B, 41C ... Connection part (with negative electrode lead terminal) 43 ... Holding member 44 ... Center holding member 45 ... Conductive member holding part 49A ... End part holding member 49B ... End part holding member 51 ... Lead cover 51A ... Fixing claw (locked structure)
51B ... Pressure projection 51C ... First protective wall insertion hole 51D ... Second protective wall insertion hole 51E ... Reception hole 51F ... Reception groove 60 ... Insulating sheet 62 ... Conductive member fixing claw 63 ... Cover locking hole (locking structure)
64: Insulating member locking claws

Claims (4)

A plurality of power storage units each including a plurality of power storage elements arranged side by side having a container in which the power storage element is accommodated and a lead terminal connected to the power storage element and led out from an edge of the container are stacked. A power storage module,
A storage module in which lead terminals of the storage elements adjacent in the lateral direction are covered with a lead cover made of an insulating material in a state of being connected to a connection member. The power storage module according to claim 1, wherein a pressing protrusion that presses a connection portion between the lead terminal and the connection member is formed on the lead cover. The power storage module according to claim 2, wherein the pressing protrusion is provided for each lead terminal. A holding member for holding the lead terminal and the connection member;
The power storage module according to any one of claims 1 to 3, wherein the lead cover is provided with a locked structure that is locked to the holding member.

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