JP6467211B2 - Power storage module - Google Patents

Description

  The present invention relates to a power storage module.

  Conventionally, a power storage module including a plurality of power storage elements such as a lithium ion secondary battery is known as a power source for a pure electric vehicle or a hybrid electric vehicle. The power storage module is formed by electrically connecting electrode terminals of a plurality of power storage elements with a bus bar.

  In Patent Document 1, laser welding is performed in a state in which the vicinity of the outer periphery of the connection portion where the connection bar (bus bar) and the electrode terminal are fitted is pressed by a laser welding jig and the weld portion between the bus bar and the electrode terminal is fixed. It is described to do.

JP 2010-67582 A

  By the way, due to the outer tolerance of the members constituting the power storage module, there may be a displacement in the height direction between the electrode terminals of the power storage elements connected by the bus bar. In this case, using a pressing jig, welding is performed in a state where the bus bar is pressed against each electrode terminal at a predetermined pressure equal to or lower than the allowable pressure with respect to the power storage element, and the bus bar and the electrode terminal are in close contact with each other.

  However, if the outer tolerance is large, a large gap is generated between the bus bar and the electrode terminal even when the bus bar is pressed against each electrode terminal at the predetermined pressure, and welding is performed with a large gap. become. As a result, a weld defect such as a crack may occur in the weld metal between the bus bar and the electrode terminal, and the joint strength may be reduced.

The power storage module according to the first aspect of the present invention is stacked and arranged in a first direction, and a plurality of power storage elements including at least a first power storage element and a second power storage element arranged adjacent to each other are electrically connected by a bus bar. Are electrically connected storage modules, wherein the bus bar is a rectangular plate-shaped first electrode joint joined to the electrode terminal of the first electricity storage element by welding, and the second electrode side of the first electrode joint A first conductive plate having a first contact portion that rises in a second direction perpendicular to the first direction from an end constituting one side, and a rectangular flat plate shape joined by welding to the electrode terminal of the second power storage element And a second conductive plate having a second contact portion that rises in a second direction from an end portion constituting one side of the second electrode joint portion on the first power storage element side , First contact portion of first conductive plate and second conductive member The second abutment are joined together.
The power storage module according to the second aspect of the present invention is a power storage module in which a plurality of power storage elements are electrically connected by a bus bar, and the bus bar is joined to the electrode terminal of the first power storage element by welding. A first conductive plate having a joining portion and a first contact portion rising from the first electrode joining portion, and a second electrically joined by welding to an electrode terminal of a second electricity storage element arranged next to the first electricity storage element The electrode joint and the second conductive plate having a pair of second abutting portions rising from the second electrode joint, and the electrode terminal of the third power storage element disposed next to the second power storage element are joined by welding. And a third conductive plate having a third contact portion rising from the third electrode joint portion, and a pair of the first contact portion of the first conductive plate and the second conductive plate One of the second contact portions is joined to each other Cage, the other of the third second contact portions of the pair of abutting portions and the second conductive plate of the third conductive plate are joined together.

  ADVANTAGE OF THE INVENTION According to this invention, the joint strength in the welding part of a bus-bar and the electrode terminal of an electrical storage element can be aimed at.

The external appearance perspective view of the electrical storage module which concerns on 1st Embodiment. The top view of an electrical storage module. The disassembled perspective view which shows the structure of an electrical storage module. The perspective view of a cell. The perspective view which shows the structure of the bus-bar of the electrical storage module which concerns on 1st Embodiment. (A) is a perspective view of a 1st electroconductive board, (b) is a perspective view of a 2nd electroconductive board. The figure explaining the alignment of a 1st conductive plate and a 2nd conductive plate. The perspective view which shows the structure of the bus-bar of the electrical storage module which concerns on 2nd Embodiment. (A) is a perspective view of a 1st electroconductive board, (b) is a perspective view of a 2nd electroconductive board. The side surface cross-section schematic diagram which shows the welding part of a 1st conductive plate and a 2nd conductive plate. The perspective view which shows the bus bar after cutting | disconnection was performed. The perspective view which shows the structure of the bus-bar of the electrical storage module which concerns on 3rd Embodiment. (A) is a perspective view of a 1st electroconductive board, (b) is a perspective view of a 2nd electroconductive board. The side surface schematic diagram which shows the bus-bar of FIG. The perspective view which shows the structure of the bus-bar of the electrical storage module which concerns on 4th Embodiment. The schematic diagram which shows the structure of the bus-bar of the electrical storage module which concerns on the modification 1. FIG. The schematic diagram which shows the structure of the bus-bar of the electrical storage module which concerns on the modification 6. FIG.

  Hereinafter, with reference to the drawings, the present invention is a power storage module incorporated in a power storage device mounted on a hybrid electric vehicle or a pure electric vehicle, and a prismatic lithium ion secondary battery (hereinafter referred to as a single cell) as a power storage element. An embodiment applied to a power storage module having a plurality of

-First embodiment-
FIG. 1 is an external perspective view of a power storage module 10 according to the first embodiment of the present invention, and FIG. 2 is a plan view of the power storage module 10. FIG. 3 is an exploded perspective view showing the configuration of the power storage module 10. In the following description, as shown in the drawing, the longitudinal direction of the power storage module 10, that is, the stacking direction of the unit cells 101 is defined as the X direction. The battery lid side on which the positive electrode terminal (hereinafter referred to as the positive electrode terminal 104) and the negative electrode terminal (hereinafter referred to as the negative electrode terminal 105) are provided is the upper side (+ Z side) of the power storage module 10, and the battery bottom side is the power storage module. 10, the vertical direction of the power storage module 10 is defined as the Z direction. A direction orthogonal to the X direction and the Z direction, that is, the width direction of the power storage module 10 will be described as the Y direction.

  As shown in FIGS. 1 to 3, the power storage module 10 includes an element stack 14 in which a plurality of single cells 101 are stacked, an integrated mechanism for integrating the element stack 14, and a bus bar cover 15. ing. In the element stack 14, a plurality of single cells 101 are electrically connected by a bus bar 11.

  Each unit cell 101 has a flat rectangular parallelepiped shape and includes a pair of wide side plates 109w (see FIG. 4). As shown in FIG. 3, the plurality of unit cells 101 constituting the element stack 14 are stacked and arranged so that the wide side plates 109 w of the adjacent unit cells 101 face each other. Adjacent unit cells 101 are arranged with their directions reversed so that the positions of the positive terminal 104 and the negative terminal 105 provided on the battery lid 108 are reversed.

  The positive electrode terminal 104 and the negative electrode terminal 105 of each adjacent unit cell 101 are electrically connected by a bus bar 11 that is a metal conductive member. That is, the plurality of single cells 101 constituting the power storage module 10 according to the present embodiment are electrically connected in series.

  Although not shown, the positive terminal 104 of the unit cell 101 disposed at one end and the negative terminal 105 of the unit cell 101 disposed at the other end are electrically connected in series or in parallel to other power storage modules by conductive members. It is connected or connected to a power extraction wiring by a conductive member.

  The integration mechanism includes a pair of end plates 17, a pair of side frames 18, a plurality of cell holders 16A and 16B, and a plurality of bolts. As shown in FIG. 3, an intermediate cell holder 16 </ b> A is disposed between adjacent unit cells 101, and an end cell holder 16 </ b> B is disposed between each of the unit cells 101 disposed at both ends and the end plate 17. Be placed. The plurality of unit cells 101 arranged in a stacked manner are held by cell holders 16A and 16B and are sandwiched by a pair of end plates 17 from both ends in the X direction. The end plate 17 has a rectangular flat plate shape corresponding to the wide side plate 109w (see FIG. 4) of the unit cell 101.

  The material of the intermediate cell holder 16A and the end cell holder 16B is an insulating resin. Convex portions 16c projecting in the Y direction are provided on the side surfaces of the cell holders 16A and 16B.

  The plurality of unit cells 101 and the cell holders 16 </ b> A and 16 </ b> B are secured by a pair of side frames 18 while being sandwiched by a pair of end plates 17. As shown in FIG. 3, the pair of side frames 18 are disposed opposite to each other on the + Y side and the −Y side of the element stack 14. Each of the pair of side frames 18 includes a pair of flanges 18f provided at both ends in the X direction and an opening 18a provided between the pair of flanges 18f. Each flange 18f is provided with a through hole 18h, and the end plate 17 is provided with a screw hole 17h.

  The opening 18a of the side frame 18 is fitted to the convex portions 16c of the cell holders 16A and 16B from the outside in the Y direction. The flange 18 f is in contact with the end plate 17. A fixing screw (fastening member) is inserted into the through hole 18h of the side frame 18 from the X direction outside of the end plate 17, and the fixing screw is screwed into the screw hole 17h of the end plate 17, whereby the side frame 18 is attached to the end plate. 17 is attached. Thereby, as shown in FIG. 1 and FIG. 2, each single battery 101 sandwiched between the pair of end plates 17 is held by the end plate 17 via the cell holders 16A and 16B.

  The single battery 101 constituting the element stack 14 will be described. The plurality of unit cells 101 have the same structure. FIG. 4 is a perspective view of the unit cell 101. As shown in FIG. 4, the unit cell 101 includes a rectangular battery container including a battery can 109 and a battery lid 108. The material of the battery can 109 and the battery cover 108 is, for example, aluminum or an aluminum alloy. The battery can 109 has a rectangular box shape having an opening at one end. The battery lid 108 has a rectangular flat plate shape and is laser-welded so as to close the opening of the battery can 109. That is, the battery lid 108 seals the battery can 109.

  A rectangular battery container including a battery lid 108 and a battery can 109 has a hollow rectangular parallelepiped shape. The battery container has a pair of wide side plates 109w each having a surface (wide surface) having the largest area among the side surfaces constituting the battery container, and has a surface having the smallest area among the side surfaces constituting the battery container. The pair of narrow side plates 109n face each other, and the battery lid 108 and the bottom plate 109b of the battery can 109 face each other.

  The battery cover 108 is provided with a positive terminal 104 and a negative terminal 105. In each of the positive electrode terminal 104 and the negative electrode terminal 105, a portion exposed from the battery lid 108 to the outside of the battery container has a rectangular parallelepiped shape, and a top surface is a flat surface in contact with the bus bar 11.

  A charge / discharge element (not shown) is housed inside the battery container in a state of being covered by an insulating case (not shown). A positive electrode of a charge / discharge element (not shown) is connected to the positive terminal 104, and a negative electrode of the charge / discharge element is connected to the negative terminal 105. For this reason, electric power is supplied to the external device via the positive electrode terminal 104 and the negative electrode terminal 105, or external generated power is supplied to the charge / discharge element via the positive electrode terminal 104 and the negative electrode terminal 105 to be charged.

  The battery lid 108 has a liquid injection hole for injecting an electrolyte into the battery container. The liquid injection hole is sealed with a liquid injection plug 108a after the injection of the electrolytic solution.

  A gas discharge valve 108 b is provided between the positive electrode terminal 104 and the negative electrode terminal 105 in the battery lid 108. The gas discharge valve 108b is heated when the unit cell 101 generates heat due to an abnormality such as overcharge and the like, and when the pressure in the battery container rises and reaches a predetermined pressure, the gas discharge valve 108b is opened and discharges the gas from the container. By doing so, the pressure in the battery container is reduced.

  As shown in FIG. 3, the bus bar cover 15 is fixed to the cell holder 16A by engaging the engaging claws 15a and 15b provided on the bus bar cover 15 with the engaging portions 16a and 16b provided on the cell holder 16A. Is done.

  The pair of bus bar covers 15 disposed at both ends in the Y direction of the power storage module 10 have the same configuration. The bus bar cover 15 is made of an insulating resin. The bus bar cover 15 is formed with an opening 15 h into which the positive terminal 104 and the negative terminal 105 of the unit cell 101 are inserted. The bus bar 11 is connected by laser welding or the like to the positive terminal 104 and the negative terminal 105 protruding upward (+ Z direction) from the opening 15h. The bus bar cover 15 is provided with an insulating plate 15d between one bus bar 11 adjacent to the other bus bar 11 and an insulation creepage distance is secured.

  In FIG. 2, the welded portion (welded metal) Wa between the bus bar 11 and the electrode terminal is schematically shown by hatching. The bus bar 11 electrically connects the positive terminal 104 and the negative terminal 105 of the cells 101 adjacent in the X direction.

  FIG. 5 is a perspective view showing a configuration of the bus bar 11, and is a partially enlarged perspective view of FIG. In FIG. 5, the bus bar cover 15 is not shown for convenience of explanation. The bus bar 11 is formed by joining the first conductive plate 110 and the second conductive plate 120 together by welding. In FIG. 5, the welded portion (welded metal) Wb between the conductive plates is schematically shown by hatching.

  6A is a perspective view of the first conductive plate 110, and FIG. 6B is a perspective view of the second conductive plate 120. As shown in FIG. 6A, the first conductive plate 110 is formed in an L shape by bending a rectangular flat plate member made of an aluminum-based metal (aluminum or aluminum alloy) by 90 degrees at a bending portion R1 by press working. Is. As shown in FIG. 6B, the second conductive plate 120 is formed by bending a rectangular flat plate member made of a composite material (clad material) of a copper-based metal (copper or copper alloy) and an aluminum-based metal by pressing. And bent at 90 degrees to form an L shape. The composite material is manufactured, for example, by rolling and rolling a copper-based metal and an aluminum-based metal, and then performing diffusion bonding by performing heat treatment. Although the first conductive plate 110 and the second conductive plate 120 are made of different materials, they are manufactured to have the same shape.

  As shown in FIG. 6A, the first conductive plate 110 includes a rectangular flat plate-shaped electrode joint portion 111 and a rectangular flat plate-shaped contact portion that rises substantially perpendicularly from an end portion constituting one side of the electrode joint portion 111. 112. The electrode bonding portion 111 has a flat surface that comes into contact with the top surface (welding surface) of the positive electrode terminal 104, and is laser-welded to the positive electrode terminal 104. The contact portion 112 has a flat contact surface 112 a that contacts the contact surface 122 a of the second conductive plate 120, and is laser-welded to the second conductive plate 120.

  As shown in FIG. 6B, the second conductive plate 120 includes a rectangular flat plate-shaped electrode joint portion 121 and a rectangular flat plate-shaped contact portion that rises substantially perpendicularly from an end portion constituting one side of the electrode joint portion 121. 122. The electrode bonding portion 121 has a flat surface that comes into contact with the top surface (welding surface) of the negative electrode terminal 105 and is laser-welded to the negative electrode terminal 105. The contact portion 122 has a flat contact surface 122 a that contacts the contact surface 112 a of the first conductive plate 110, and is laser-welded to the first conductive plate 110.

  The electrode joint 121 of the second conductive plate 120 is made of a copper-based metal. The contact portion 122 of the second conductive plate 120 has a distal end side made of an aluminum-based metal, and a proximal end portion 129 on the proximal end side (that is, the bent portion R2 side) made of a copper-based metal.

  A method for manufacturing the power storage module 10 according to the first embodiment will be described. The manufacturing method of the electrical storage module 10 includes a preparation step, an integration step, a conductive plate alignment step, a conductive plate joining step, and a single cell connection step.

-Preparation process-
In the preparation process, each component constituting the power storage module 10, for example, a plurality of single cells 101, a first conductive plate 110, a second conductive plate 120, cell holders 16A and 16B, a pair of bus bar covers 15, and an integrated mechanism component are prepared. To do.

-Integration process-
In the integration process, a plurality of single cells 101 are stacked and sandwiched between the cell holder 16B and the end plate 17 from both sides in the stacking direction with the cell holder 16A interposed therebetween, and the side frame 18 is screwed to the end plate 17, The element stack 14 in which the plurality of single cells 101 are integrated is secured.

-Conductive plate alignment process-
With reference to FIGS. 5 and 7, the conductive plate alignment step will be described. FIG. 7 is a diagram for explaining the alignment of the first conductive plate 110 and the second conductive plate 120. 5 and 7, for convenience of explanation, the unit cell 101 to which the first conductive plate 110 constituting one bus bar 11 is welded is referred to as a first unit cell 101A. The unit cell 101 disposed next to the first unit cell 101A and to which the second conductive plate 120 constituting the one bus bar 11 is welded is referred to as a second unit cell 101B. The first unit cell 101A and the second unit cell 101B are electrically connected by the one bus bar 11. A portion indicated by a broken line in FIG. 7B indicates a welding range L necessary for sufficiently reducing the electrical connection resistance while ensuring sufficient bonding strength.

  In the conductive plate alignment step, the first conductive plate 110 is placed on the positive terminal 104 of the first unit cell 101 </ b> A, and the electrode joint 111 is brought into contact with the top surface of the positive terminal 104. The second conductive plate 120 is placed on the negative electrode terminal 105 of the second unit cell 101 </ b> B, and the electrode joint 121 is brought into contact with the top surface of the negative electrode terminal 105. The contact surface 112a of the contact portion 112 of the first conductive plate 110 and the contact surface 122a of the contact portion 122 of the second conductive plate 120 are contacted, and the contact surfaces 112a and 122a are connected to the first unit cell 101A. It is located between the second unit cells 101B.

  Here, as shown in FIG. 7A, when the top surface of the positive electrode terminal 104 and the top surface of the negative electrode terminal 105 exist in the same plane, that is, the height of the positive electrode terminal 104 and the negative electrode terminal 105 is high. When there is no positional displacement in the direction (Z direction), the first conductive plate 110 and the second conductive plate 120 are arranged so as to be plane-symmetric with respect to the contact surfaces 112a and 122a. However, as shown in FIG. 7B, the positive terminal of the first unit cell 101A is caused by the outer tolerance of the members constituting the power storage module 10, such as the unit cell 101, the integrated mechanism component, the cell holders 16A and 16B, and the like. There may be a displacement in the height direction (Z direction) between the top surface (welded surface) of 104 and the top surface (welded surface) of the negative electrode terminal 105 of the second unit cell 101B.

  In the present embodiment, each of contact surface 112a of first conductive plate 110 and contact surface 122a of second conductive plate 120 is a welded surface with first conductive plate 110 in positive electrode terminal 104 of first unit cell 101A. And a top surface which is a welding surface with the second conductive plate 120 in the negative electrode terminal 105 of the second unit cell 101B, that is, a surface parallel to the height direction (Z direction). Yes.

  For this reason, as shown in FIG. 7B, the top surface of the negative electrode terminal 105 of the second unit cell 101B is at the position of the dimension G in the height direction with respect to the top surface of the positive electrode terminal 104 of the first unit cell 101A. Even if a shift occurs, it is possible to ensure the welding range L necessary for joining the first conductive plate 110 and the second conductive plate 120 together.

  In the welding range L, the joint portion of the first conductive plate 110 with the second conductive plate 120 and the joint portion of the second conductive plate 120 with the first conductive plate 110 are the same type of material (the present embodiment). Then, it is made of a copper-based metal.

-Conductive plate joining process-
In the conductive plate joining step, a state in which the contact surface 112a of the contact portion 112 of the first conductive plate 110 and the contact surface 122a of the contact portion 122 of the second conductive plate 120 are in contact with each other is not shown. In this state, the laser beam is irradiated to the welding range L. Note that a jig (not shown) holds the positions of the first conductive plate 110 and the second conductive plate 120 so as to sandwich both side surfaces in the Y direction. In the present embodiment, the first conductive plate 110 is irradiated with laser light obliquely from above the bus bar 11 to be irradiated, scanned in the Z direction, and the weld metal Wb is schematically shown by hatching in FIG. Formed. The weld metal Wb is formed such that its length in the Z direction is longer than the length of the weld range L described above.

-Single cell connection process-
In the unit cell connection step, the laser beam is irradiated to the electrode joint portions 111 and 121 of the bus bar 11 while the position of the bus bar 11 is fixed. In the present embodiment, laser light is irradiated in the Z direction from directly above the bus bar 11 to be irradiated, scanned in the X direction, and the weld metal Wa is formed as schematically shown by hatching in FIG.

  The power storage module 10 is completed by welding each bus bar 11 to the adjacent unit cells 101.

According to the first embodiment described above, the following operational effects are obtained.
(1) The bus bar 11 includes a first conductive plate 110 having an electrode joint portion 111 joined to the positive electrode terminal 104 of the first unit cell 101A by welding, and a contact portion 112 rising from the electrode joint portion 111; An electrode joint portion 121 joined by welding to the negative electrode terminal 105 of the second unit cell 101B disposed next to the unit cell 101A, and a second conductive plate 120 having a contact portion 122 rising from the electrode joint portion 121. The contact portion 112 of the first conductive plate 110 and the contact portion 122 of the second conductive plate 120 are joined to each other.
Thereby, even when the positional tolerance in the height direction (Z direction) occurs between the electrode terminals connected by the bus bar 11 with a large external tolerance, the welded portion between the bus bar 11 and the electrode terminal of the unit cell 101 In (welded metal Wa), high joint strength can be ensured. Furthermore, since the contact portions 112 and 122 rising from the electrode joint portions 111 and 121 are joined, workability is good.

  Conventionally, in order to eliminate the gap formed between the bus bar and the electrode terminal due to the positional deviation between the electrode terminals connected by one bus bar, the bus bar is electroded at a predetermined pressure below the allowable pressure for the unit cell 101. The terminal was pressed. For this reason, when the outer tolerance is large, a gap is generated between the bus bar and the electrode terminal even when the bus bar is pressed against each electrode terminal with a predetermined pressure, and a welded portion (welded metal) between the bus bar and the electrode terminal. There was a possibility that welding defects such as cracks would occur in the steel, and the bonding strength could be reduced.

  On the other hand, in the present embodiment, even when a positional deviation occurs between the electrode terminals in the height direction, the first conductive plate 110 and the second conductive plate 120 are individually welded to each electrode terminal. be able to. For this reason, it is not necessary to press the bus bar 11 against the electrode terminal. Even when the external tolerance is large, welding can be performed in a state where the bus bar 11 and the electrode terminals (the positive terminal 104 and the negative terminal 105) are in close contact with each other without pressing the bus bar 11 toward the unit cell 101. Therefore, it is possible to prevent a weld defect such as a crack from occurring in the weld metal Wb between the bus bar 11 and the electrode terminal, and to secure a sufficient joint strength.

(2) Since the bus bar 11 is composed of the first conductive plate 110 and the second conductive plate 120, and the first conductive plate 110 and the second conductive plate 120 are individually joined to the unit cell 101, the first The degree of freedom of welding of the conductive plate 110 and the second conductive plate 120 to the electrode terminals can be improved.

  Conventionally, since it was necessary to weld the bus bar while pressing it toward the electrode terminal, the pressing surface of the bus bar pressed by the pressing jig cannot be set as the welding range. It is necessary to provide a welding range and a pressing range separately, which may increase the size of bus bars and electrode terminals.

  In contrast, in the present embodiment, the bus bar 11 can be brought into close contact with the electrode terminals (the positive terminal 104 and the negative terminal 105) without being pressed, so that the side surfaces of the bus bar 11 are held with respect to the electrode terminals. Thus, welding may be performed with the position fixed, and the degree of freedom of welding is higher than in the past. Since the entire electrode joints 111 and 121 of the bus bar 11 can be set as a welding range and there is no need to provide a pressing range, the bus bar 11 and the electrode terminals can be downsized.

(3) The contact portion of the contact portion 112 of the first conductive plate 110 with the contact portion 122 of the second conductive plate 120 and the contact portion of the first conductive plate 110 at the contact portion 122 of the second conductive plate 120. The joint portion with the portion 112 is made of the same kind of metal material. Since the dissimilar metal materials are not joined to each other, corrosion due to electrolytic corrosion on the contact surface of the dissimilar metal material can be prevented. The second conductive plate 120 is a composite material (cladding material) in which an aluminum-based metal material and a copper-based metal material are solid-phase bonded, and water and air can be prevented from entering the interface between different metal materials, The occurrence of electrolytic corrosion at the interface is prevented.

(4) A welding surface of the electrode terminal of the first unit cell 101A with the first conductive plate 110 on both the contact portion 112 of the first conductive plate 110 and the contact portion 122 of the second conductive plate 120; Contact surfaces 112a and 122a that are parallel to the direction of displacement of the electrode terminal of the unit cell 101B from the welding surface with the second conductive plate 120 are provided. In order to bring the first conductive plate 110 and the second conductive plate 120 into contact with each other when the positional deviation in the height direction between the electrode terminals occurs, the first conductive plate 110 and the second conductive plate 120 are placed in the XY plane. There is no need to move it. That is, the second conductive plate 120 may be translated in the height direction (Z direction) with respect to the first conductive plate 110. For this reason, the bus bar 11 can be made compact while sufficiently securing the welding range between the first conductive plate 110 and the electrode terminal and the welding range between the second conductive plate 120 and the electrode terminal.

  On the other hand, when neither the first conductive plate 110 nor the second conductive plate 120 is provided with a contact surface parallel to the height direction, for example, the first conductive plate 110 and the second conductive plate 120 are provided. If each of the contact surfaces has an arc shape that swells toward the other conductive plate, it is necessary to move the first conductive plate and the second conductive plate within the XY plane when a positional shift occurs in the height direction. Occurs. As a result, the welding range between the first conductive plate and the electrode terminal and the welding range between the second conductive plate and the electrode terminal may be insufficient. In order to secure the welding range, it is necessary to form the first conductive plate and the second conductive plate larger in advance.

-Second Embodiment-
A power storage module according to the second embodiment will be described with reference to FIGS. In the figure, the same reference numerals are assigned to the same or corresponding parts as those in the first embodiment, and the differences will be mainly described. FIG. 8 is a perspective view showing the configuration of the bus bar 21 of the power storage module according to the second embodiment. FIG. 9A is a perspective view of the first conductive plate 210, and FIG. It is a perspective view. FIG. 10 is a schematic side sectional view showing a welded portion (welded metal Wc) between the first conductive plate 210 and the second conductive plate 220.

  Similar to the bus bar 11 according to the first embodiment, the bus bar 21 according to the second embodiment includes a first conductive plate 210 and a second conductive plate 220. The difference between the bus bar 21 according to the second embodiment and the bus bar 11 according to the first embodiment is that each of the contact portion 212 of the first conductive plate 210 and the contact portion 222 of the second conductive plate 220 is different. A pair of projecting pieces projecting outward in the Y direction are provided at both ends in the Y direction.

  As shown in FIG. 9A, the contact portion 212 of the first conductive plate 210 is provided with a first protruding piece 213 at the tip, and is separated from the first protruding piece 213 by a predetermined distance toward the bent portion R1. A second protruding piece 214 is provided at the position. The first protruding piece 213 and the second protruding piece 214 are formed to have the same protruding length, and a U-shaped notch 215 is formed between the first protruding piece 213 and the second protruding piece 214. Has been.

  As shown in FIG. 9B, the contact portion 222 of the second conductive plate 220 is provided with a first protruding piece 223 at the tip, and is separated from the first protruding piece 223 by a predetermined distance toward the bent portion R2. A second protruding piece 224 is provided at the position. The first protruding piece 223 and the second protruding piece 224 are formed to have the same protruding length, and a U-shaped notch 225 is formed between the first protruding piece 223 and the second protruding piece 224. Has been.

  The notch 215 and the notch 225 can be used as an abutting reference portion of a jig (not shown) used for joining the first conductive plate 210 and the second conductive plate 220 in the conductive plate joining step. . When laser welding is automatically performed, a controller (not shown) of a laser welding apparatus (not shown) recognizes an image of either the notch 215 or the notch 225 photographed by the camera, so that the bus bar 21 The laser irradiation position may be determined and laser welding may be performed based on the determination result. That is, the notch 215 and the notch 225 function as marks for joining the first conductive plate 210 and the second conductive plate 220.

  The conductive plate joining process according to the second embodiment will be described. A state in which the contact portion 212 of the first conductive plate 210 and the contact portion 222 of the second conductive plate 220 are in contact with each other is held by a jig (not shown). Irradiate the tip of the contact portion 222. In the present embodiment, laser light is irradiated in the Z direction from directly above the top surfaces of the contact portions 212 and 222 that are to be irradiated, scanned in the Y direction, and hatched in FIGS. 8 and 10. As schematically shown, the weld metal Wc was formed.

  The notch 215 and the notch 225 described above can be used as marks for separating the joint portion between the first conductive plate 210 and the second conductive plate 220. For example, when there is a defect in the weld metal Wc shown in FIG. 8, the notch 215 and the notch 225 are used to separate the weld metal Wc that is a joint portion between the first conductive plate 210 and the second conductive plate 220. It can be used as an abutting reference portion for a jig (not shown) to be used.

  In addition, when cutting automatically, a controller (not shown) of a cutting device (not shown) recognizes one of the notch 215 and the notch 225 photographed by the camera, thereby cutting the bus bar 21. The position may be determined, and cutting may be performed based on the determination result. Cutting is performed on a virtual straight line connecting notches on both sides in the Y direction. FIG. 11 is a perspective view showing the bus bar 21 after being cut. After the cutting is performed, the first conductive plate 210 and the second conductive plate 220 can be joined by irradiating the laser from directly above the cut surface and forming the weld metal Wc again by scanning in the Y direction. . In the power storage module, the cut bus bar 21 has a shorter Z-direction dimension (height dimension) than the uncut bus bar 21.

According to such 2nd Embodiment, in addition to the effect similar to 1st Embodiment, the following effect is obtained.
(5) The bus bar 21 has a mark for joining the contact portion 212 of the first conductive plate 210 and the contact portion 222 of the second conductive plate 220, and the contact portion 212 of the first conductive plate 210. Notches 215 and 225 having both functions of a mark for separating the joint portion of the contact portion 222 of the second conductive plate 220 are provided.
As a result, it is possible to reduce the number of manufacturing steps and the manufacturing cost of the power storage module.
Further, when a defect occurs in the weld metal Wc, the first conductive plate 210 and the second conductive plate 210 and the second conductive plate 210 and the second conductive plate 210 are separated from each other after the joint portion (welded metal Wc) of the first conductive plate 210 and the second conductive plate 220 is cut off. Since the conductive plate 220 can be joined, the yield of the power storage module can be improved.

-Third embodiment-
With reference to FIGS. 12-14, the electrical storage module which concerns on 3rd Embodiment is demonstrated. In the figure, the same reference numerals are assigned to the same or corresponding parts as those in the first embodiment, and the differences will be mainly described. 12A and 12B are perspective views showing the configuration of the bus bar 31 of the power storage module according to the third embodiment. FIG. 13A is a perspective view of the first conductive plate 310, and FIG. It is a perspective view.

  As shown in FIG. 12, in the third embodiment, the contact portion 312 of the first conductive plate 310 and the contact portion 322 of the second conductive plate 320 are respectively bifurcated, and the first embodiment Compared to the configuration, the redundancy is high.

  As shown in FIG. 13A, the contact portion 312 of the first conductive plate 310 has a pair of contact pieces 317 that are divided into two forks from the vicinity of the bent portion R1 and extend toward the tip. . A groove 318 is provided between the pair of contact pieces 317. As shown in FIG. 13B, the contact portion 322 of the second conductive plate 320 has a pair of contact pieces 327 that are divided into two forks from the vicinity of the bent portion R2 and extend toward the tip. . A groove 328 is provided between the pair of contact pieces 327.

  FIG. 14 is a schematic side view showing the bus bar 31. As shown in FIG. 14, the abutting portion 312 of the first conductive plate 310 includes a proximal end portion 312d extending in the + Z direction from the bent portion R1 and a bent portion of approximately 45 degrees from the distal end of the proximal end portion 312d, and the + X direction. And a pressing portion 312c which is bent approximately 45 degrees from the tip of the inclined portion 312e and extends in the + Z direction. Therefore, a gap is provided in the X direction between the base end portion 312 d of the contact portion 312 of the first conductive plate 310 and the contact portion 322 of the second conductive plate 320.

  Thus, in the present embodiment, the contact portion 312 of the first conductive plate 310 has a cantilever structure with the bent portion R1 as a fixed end. That is, the contact portion 312 of the first conductive plate 310 is configured to be elastically deformed with the bent portion R1 as a fulcrum when a pressing force is applied to the pressing portion 312c.

  In the third embodiment, welding is performed in a state where the pressing portion 312 c of the first conductive plate 310 and the contact portion 322 of the second conductive plate 320 are in contact with each other. At this time, the first conductive plate 310 is elastically deformed in the stacking arrangement direction (X direction) of the plurality of single cells 101, and an elastic force corresponding to the amount of elastic deformation is applied to the second conductive plate 320. .

  A method for manufacturing the power storage module according to the third embodiment will be described. The manufacturing method of the electrical storage module 10 includes a preparation process, a terminal welding process, an integration process, and a conductive plate joining process. Since the preparation process is the same as that of the first embodiment described above, description thereof is omitted.

-Terminal welding process-
In the terminal welding process, the first conductive plate 310 is placed on the positive electrode terminal 104 of the unit cell 101, and the electrode joint portion 111 is brought into contact with the top surface of the positive electrode terminal 104. In a state where the position of the first conductive plate 310 is fixed, the laser light is irradiated to the electrode joint portion 111 of the first conductive plate 310 to weld the first conductive plate 310 to the positive electrode terminal 104.

  The second conductive plate 320 is placed on the negative electrode terminal 105 of the unit cell 101, and the electrode joint 121 is brought into contact with the top surface of the negative electrode terminal 105. In a state where the position of the second conductive plate 320 is fixed, a laser beam is applied to the electrode joint portion 121 of the second conductive plate 320 to weld the second conductive plate 320 to the negative electrode terminal 105.

-Integration process-
In the integration process, a plurality of single cells 101 are stacked and sandwiched between the cell holder 16B and the end plate 17 from both sides in the stacking direction with the cell holder 16A interposed therebetween, and the side frame 18 is screwed to the end plate 17, The element stack 14 in which the plurality of single cells 101 are integrated is secured.

  Since the first conductive plate 310 and the second conductive plate 320 are welded to each unit cell 101 in advance, when the plurality of unit cells 101 are tied together by the integrated mechanism, the first conductive plate 310 and the second conductive plate 320 are connected. The conductive plate 320 contacts.

  In the present embodiment, the first conductive plate 310 and the second conductive plate 320 are in contact with each other even when the gap between adjacent unit cells is maximized due to tolerance. The positions of the plate 310 and the second conductive plate 320 are set. For this reason, as shown in FIG. 14, when the first conductive plate 310 and the second conductive plate 320 are brought into contact with each other, the first conductive plate 310 is elastically deformed in the −X direction, and the first conductive plate 310 and the second conductive plate 310 are The conductive plate 320 is pressed into contact with the elastic force.

-Conductive plate joining process-
In the conductive plate joining step, the state where the contact portion 312 of the first conductive plate 310 and the contact portion 322 of the second conductive plate 320 are in contact is held by the integrated mechanism. Laser light is applied to the tip portions of the contact portion 312 and the contact portion 322. In the present embodiment, laser light is irradiated in the Z direction from directly above the top surfaces of the contact portions 312 and 322 to be irradiated, scanned in the Y direction, and weld metal Wd (see FIG. 12). ) Was formed. In the present embodiment, since a pair of contact pieces 317 and 327 are provided in each of the contact portion 312 and the contact portion 322, there are two joint portions in one bus bar 31. Yes.

According to such 3rd Embodiment, in addition to the effect similar to 1st Embodiment, the following effect is obtained.
(6) The first conductive plate 310 is configured to elastically deform in the stacking arrangement direction of the plurality of single cells 101.
For this reason, the first conductive plate 310 and the second conductive plate 320 can be press-contacted by an elastic force and welded in close contact with each other, so that the welding strength can be further improved.

(7) Since the bus bar 31 is configured to be elastically deformed, the force generated between the adjacent single cells 101 can be absorbed. For example, the force generated when vibration or impact is applied to the vehicle on which the power storage module is mounted, or when thermal expansion or contraction occurs can be absorbed by elastic deformation. As a result, it is possible to suppress aged deterioration of the weld metal Wa that is a joint portion between the bus bar 31 and the electrode terminal.

(8) The contact piece 317 that is a joint portion of the contact portion 312 of the first conductive plate 310 with the contact portion 322 of the second conductive plate 320 and the first contact portion 322 of the second conductive plate 320. Two contact pieces 327 that are joint portions with the contact portion 312 of the conductive plate 310 are provided at two locations. For this reason, even if a welding defect occurs in one of the two places, it can be joined in the other, so the yield of the power storage module can be improved. That is, the redundancy is improved as compared with the first embodiment. In the present embodiment, welding is performed at one of the two joint portions, so that a sufficient joint strength is secured at the weld portion between the first conductive plate 310 and the second conductive plate 320. The necessary welding range is secured so that the electrical connection resistance can be sufficiently reduced.

-Fourth embodiment-
A power storage module according to the fourth embodiment will be described with reference to FIG. In the figure, the same reference numerals are assigned to the same or corresponding parts as those in the first embodiment, and the differences will be mainly described. FIG. 15 is a perspective view showing the configuration of the bus bar 41 of the power storage module according to the fourth embodiment.

  In the first embodiment, an example in which a plurality of unit cells 101 are connected in series has been described. In contrast, in the fourth embodiment, two adjacent unit cells 101 are connected in parallel, and the two unit cells 101 connected in parallel are connected in series as one unit. In the present embodiment, four adjacent unit cells 101 are connected by one bus bar 41. The bus bar 41 includes a first conductive plate 410, a second conductive plate 420, a third conductive plate 430, and a fourth conductive plate 440.

  In FIG. 15, for convenience of explanation, the unit cell 101 to which the first conductive plate 410 constituting one bus bar 41 is welded is referred to as a first unit cell 101A. The unit cell 101 arranged next to the first unit cell 101A and to which the second conductive plate 420 constituting the one bus bar 41 is welded is referred to as a second unit cell 101B. The unit cell 101 disposed next to the second unit cell 101B and to which the third conductive plate 430 constituting the one bus bar 41 is welded is referred to as a third unit cell 101C. The unit cell 101 disposed next to the third unit cell 101C and to which the fourth conductive plate 440 constituting the one bus bar 41 is welded is referred to as a fourth unit cell 101D. The first unit cell 101A, the second unit cell 101B, the third unit cell 101C, and the fourth unit cell 101D are electrically connected by the one bus bar 41.

  Since the first conductive plate 410 has the same configuration as the first conductive plate 110 described in the first embodiment, the description thereof is omitted.

  The second conductive plate 420 is formed in a U shape by bending two portions of a rectangular flat plate member made of an aluminum-based metal by 90 degrees by pressing. The third conductive plate 430 is formed in a U shape by bending two portions of a rectangular flat plate member made of a composite material of a copper-based metal and an aluminum-based metal by 90 degrees by pressing. The fourth conductive plate 440 is an L-shape obtained by bending a rectangular flat plate member made of a copper-based metal 90 degrees by pressing.

  The second conductive plate 420 includes a rectangular flat plate-shaped electrode joint portion 421, a rectangular flat plate-shaped positive electrode-side contact portion 422 </ b> P that rises substantially vertically from an end portion constituting one side of the electrode joint portion 421, and the electrode joint portion 421. It has a rectangular flat plate negative electrode side contact portion 422N that rises substantially vertically from an end portion that constitutes one side. The positive electrode side contact portion 422P and the negative electrode side contact portion 422N are disposed to face each other. The electrode bonding portion 421 has a flat surface that comes into contact with the top surface of the positive electrode terminal 104 and is laser-welded to the positive electrode terminal 104. The positive electrode side contact portion 422P has a flat contact surface that contacts the contact portion 112 of the first conductive plate 410, and is laser-welded to the first conductive plate 410. The negative electrode side contact portion 422N has a flat contact surface that contacts the positive electrode side contact portion 432P of the third conductive plate 430, and is laser-welded to the third conductive plate 430.

  The third conductive plate 430 includes a rectangular plate-shaped electrode joint portion 431, a rectangular plate-shaped positive electrode side contact portion 432 </ b> P that rises substantially perpendicularly from an end constituting one side of the electrode joint portion 431, and the electrode joint portion 431. It has a rectangular flat plate negative electrode side contact portion 432N that rises substantially vertically from an end portion that constitutes one side. The positive electrode side contact portion 432P and the negative electrode side contact portion 432N are disposed to face each other. The electrode bonding portion 431 has a flat surface that comes into contact with the top surface of the negative electrode terminal 105 and is laser-welded to the negative electrode terminal 105. The positive electrode side contact portion 432P has a flat contact surface that contacts the negative electrode side contact portion 422N of the second conductive plate 420, and is laser-welded to the second conductive plate 420. The negative electrode side contact portion 432N has a flat contact surface that contacts the contact portion 442 of the fourth conductive plate 440, and is laser-welded to the fourth conductive plate 440.

  In the third conductive plate 430, the electrode joint portion 431 and the negative electrode side contact portion 432N are made of a copper-based metal. The positive electrode side contact portion 432P of the third conductive plate 430 has a distal end side made of an aluminum-based metal and a proximal end side (that is, a bent portion side) proximal end portion 439 made of a copper-based metal.

  The fourth conductive plate 440 includes a rectangular flat plate-shaped electrode joint portion 441 and a rectangular flat plate-shaped contact portion 442 that rises substantially vertically from an end portion constituting one side of the electrode joint portion 441. The electrode bonding portion 441 has a flat surface that comes into contact with the top surface of the negative electrode terminal 105 and is laser-welded to the negative electrode terminal 105. The contact portion 442 has a flat contact surface that is in contact with the negative electrode side contact portion 432N of the third conductive plate 430, and is laser-welded to the third conductive plate 430.

Thus, in 4th Embodiment, the electrically conductive plates provided for every several unit cell 101 connected in series and parallel were joined, and the one bus bar 41 was comprised. The second conductive plate 420 includes an electrode joint portion 421 that is joined to the electrode terminal by welding, and a pair of contact portions that rise from the electrode joint portion 421 (a positive side contact portion 422P and a negative side contact portion 422N). doing. One contact portion (positive electrode side contact portion 422P) of the pair of contact portions is joined to the contact portion 112 of the first conductive plate 410, and the other contact portion (negative electrode side contact portion 422N). Is joined to the positive electrode side contact portion 432P of the third conductive plate 430. The third conductive plate 430 includes an electrode joint portion 431 that is joined to the electrode terminal by welding, and a pair of contact portions that rise from the electrode joint portion 431 (a positive side contact portion 432P and a negative side contact portion 432N). doing. One contact portion (positive electrode side contact portion 432P) of the pair of contact portions is joined to the negative electrode side contact portion 422N of the second conductive plate 420, and the other contact portion (negative electrode side contact portion). 432N) is joined to the contact portion 442 of the fourth conductive plate 440.
According to the fourth embodiment as described above, even when the electrode terminal is displaced due to the outer tolerance, as in the effect (1) described in the first embodiment. Further, it is possible to prevent a weld defect such as a crack from occurring in the weld metal between the bus bar 41 and the electrode terminal, and to ensure a sufficient joint strength.

  Further, according to the fourth embodiment, the same operational effects as (2) to (4) described in the first embodiment are obtained.

The following modifications are also within the scope of the present invention, and one or a plurality of modifications can be combined with the above-described embodiment.
(Modification 1)
In the above-described embodiment, an example in which the contact surface between the first conductive plates 110, 210, 310, 410 and the second conductive plates 120, 220, 320, 420 is formed as a surface parallel to the Z direction has been described. However, the present invention is not limited to this. The first conductive plates 110, 210, 310, 410 and the second conductive plates 120, 220, 320, 420, when positional deviation in the height direction (Z direction) occurs between the electrode terminals of the adjacent unit cells 101. Various shapes that can be brought into contact with each other can be adopted.

  For example, as shown in FIG. 16, both contact surfaces can be configured as curved surfaces such as arcs. In this case, it is preferable that at least one of the first conductive plate 510 and the second conductive plate 520 constituting the bus bar 51 be elastically deformed. In FIG. 16, both the first conductive plate 510 and the second conductive plate 520 are formed in a cantilever shape that is elastically deformed with the bent portions R1 and R2 as fulcrums.

(Modification 2)
In the second embodiment, a mark for separating the joint portion between the first conductive plate 210 and the second conductive plate 220, that is, a cut mark, and a joint between the first conductive plate 210 and the second conductive plate 220 are used. Although the example in which the notches 215 and 225 having the functions of both the mark and the joint mark are provided has been described, the present invention is not limited to this. For example, you may have only one function of a cutting mark and a joint mark.

(Modification 3)
In the second embodiment, the example in which the pair of notches 215 and 225 are provided in each of the first conductive plate 210 and the second conductive plate 220 has been described. However, the present invention is not limited to this. Two or more pairs of notches can be provided. One of the pair of notches 215 may be omitted. Similarly, one of the pair of notches 225 may be omitted. One of the notch 215 and the notch 225 can be omitted.

(Modification 4)
Instead of the notches 215 and 225 shown in the second embodiment, a through hole or a depression can be provided and used as a cut mark or a joint mark. Any shape that can recognize images can be used for automation of cutting and joining. For this reason, instead of the notches 215 and 225, a mark can be written with a pen or the like, or a bent portion can be formed for image recognition.

(Modification 5)
In the third embodiment, two joint portions of the first conductive plate 310 with the second conductive plate 320 and two joint portions of the second conductive plate 320 with the first conductive plate 310 are provided. Although an example has been described, the present invention is not limited to this. Redundancy may be improved by providing three or more joints.

(Modification 6)
In the above-described embodiment, the example in which the plurality of conductive plates constituting the bus bar are connected by laser welding has been described, but the present invention is not limited to this. Instead of laser welding, the conductive plates may be joined by other welding methods such as electron beam welding. As shown in FIG. 17A, instead of laser welding, a caulking joint 650 may be formed by caulking to join the conductive plates together. As shown in FIG. 17 (b), instead of laser welding, the tip of the contact portion may be bent to form a bent portion 751, and the conductive plates may be joined together. As shown in FIG. 17 (c), instead of laser welding, a clip 852 and a fastening member 953 such as a bolt and a nut as shown in FIG. May be joined. Instead of laser welding, the conductive plates may be joined by a solid phase joining method such as diffusion welding or friction stir welding.

(Modification 7)
In the first to third embodiments, the example in which the second conductive plates 120, 220, and 320 welded to the negative electrode terminal 105 are composed of the composite material (cladding material) has been described, but the present invention is not limited to this. . The second conductive plates 120, 220, and 320 may be made of only a copper-based metal, and the first conductive plates 110, 210, and 310 may be made of a composite material of an aluminum-based metal and a copper-based metal. In this case, the joint of the first conductive plates 110, 210, and 310 with the second conductive plates 120, 220, and 320 and the first conductive plates 110, 210, and 310 of the second conductive plates 120, 220, and 320 are connected. The first conductive plates 110, 210, and 310 are configured so that the joint portion is made of the same material, that is, a copper-based metal. The first conductive plates 110, 210, 310 and the second conductive plates 120, 220, 320 can be configured not to use a composite material.

  The first conductive plates 110, 210, and 310 may be made of an aluminum metal, and the second conductive plates 120, 220, and 320 may be made of a copper metal.

  In the fourth embodiment, the example in which the third conductive plate 430 welded to the negative electrode terminal 105 is composed of a composite material (cladding material) has been described, but the present invention is not limited to this. The third conductive plate 430 may be composed of only a copper-based metal, and the second conductive plate 420 may be composed of a composite material of an aluminum-based metal and a copper-based metal. In this case, the joint portion of the third conductive plate 430 with the second conductive plate 420 and the joint portion of the second conductive plate 420 with the third conductive plate 430 are made of the same material, that is, a copper-based metal. A second conductive plate 420 is configured. The first conductive plate 410 to the fourth conductive plate 440 may be configured not to use a composite material.

  The first conductive plate 410 and the second conductive plate 420 may be made of an aluminum-based metal, and the third conductive plate 430 and the fourth conductive plate 440 may be made of a copper-based metal.

(Modification 8)
In the above-described embodiment, an example in which the present invention is applied to an electric vehicle has been described, but the present invention is not limited to this. Also in a power storage module incorporated in a power storage device that constitutes a power supply device for vehicles of other electric vehicles, for example, railway vehicles such as hybrid trains, passenger cars such as buses, trucks such as trucks, and industrial vehicles such as battery-powered forklift trucks. The present invention can be applied.

(Modification 9)
Although the lithium ion secondary battery has been described as an example of the storage element, the present invention can be applied to other secondary batteries such as a nickel metal hydride battery. Furthermore, the present invention can be applied to a power storage module using an electric double layer capacitor or a lithium ion capacitor as a power storage element.

  As long as the characteristics of the present invention are not impaired, the present invention is not limited to the above-described embodiments, and other forms conceivable within the scope of the technical idea of the present invention are also included in the scope of the present invention. .

DESCRIPTION OF SYMBOLS 10 Power storage module, 11 Bus bar, 14 Element laminated body, 15 Bus bar cover, 15a Engagement claw, 15d Insulating plate, 15h Opening part, 16A Cell holder, 16B Cell holder, 16a Engagement part, 16c Convex part, 17 End plate, 17h Screw Hole, 18 side frame, 18a opening, 18f flange, 18h through hole, 21 bus bar, 31 bus bar, 41 bus bar, 51 bus bar, 101 cell, 104 positive terminal, 105 negative terminal, 108 battery cover, 108a injection plug, 108b Gas exhaust valve, 109 battery can, 109b bottom plate, 109n narrow side plate, 109w wide side plate, 110 first conductive plate, 111 electrode joint, 112 abutment portion, 112a abutment surface, 120 second conductive plate, 121 electrode Joining part, 122 Abutting part, 122a Surface, 129 base end, 210 first conductive plate, 212 contact portion, 213 first protruding piece, 214 second protruding piece, 220 second conductive plate, 222 contact portion, 223 first protruding piece, 224 second Protruding piece, 310 first conductive plate, 312 abutting portion, 312c pressing portion, 312d base end portion, 312e inclined portion, 317 abutting piece, 318 groove, 320 second conductive plate, 322 abutting portion, 327 abutting Piece, 328 Groove, 410 First conductive plate, 420 Second conductive plate, 421 Electrode joint, 422N Negative electrode side contact portion, 422P Positive electrode side contact portion, 430 Third conductive plate, 431 Electrode joint portion, 432N Negative electrode side Contact part, 432P Positive electrode side contact part, 439 Base end part, 440 Fourth conductive plate, 441 Electrode joint part, 442 Contact part, 510 First conductive plate, 520 Second conductive plate, 650 Crimp joint part, 51 bending unit, 852 clips, fastening member 953

Claims (8)

A power storage module in which a plurality of power storage elements that are arranged in a first direction and are arranged adjacent to each other and including at least a first power storage element and a second power storage element are electrically connected by a bus bar,
The bus bar, the first electrode junction rectangular flat plate that are bonded to the electrode terminals by welding of the first storage element, and an end portion constituting a side of said second power storage device side of the first electrode junction said first direction perpendicular to the second and first conductive plate having a first contact portion which rises in the direction, a rectangular plate-shaped second electrode which is joined by welding to the electrode terminal of the pre-Symbol second storage element from A second conductive plate having a junction and a second contact portion that rises in the second direction from an end constituting one side of the second electrode junction on the first power storage element side ;
The power storage module in which the first contact portion of the first conductive plate and the second contact portion of the second conductive plate are joined to each other. The power storage module according to claim 1,
The first electrode joint and the second electrode joint are made of different materials,
The power storage module made of the same kind of material at a joint portion between the first contact portion and the second contact portion and a joint portion between the second contact portion and the first contact portion. The power storage module according to claim 1 or 2,
At least one of the first contact portion and the second contact portion includes a welded surface with the first conductive plate in the electrode terminal of the first power storage element, and an electrode terminal of the second power storage element. The power storage module provided with the contact surface parallel to the position shift direction with the welding surface with the said 2nd conductive plate. In the electrical storage module as described in any one of Claims 1-3 ,
Before SL at least one of the first conductive plate and the second conductive plate is configured as has been that the power storage module elastically deformed in the first direction. In the electrical storage module as described in any one of Claims 1-3 ,
The bus bar has a mark for joining the first contact part and the second contact part, and a mark for separating the joint part of the first contact part and the second contact part. A power storage module provided with at least one. In the electrical storage module as described in any one of Claims 1-3 ,
The electrical storage module in which the junction part with the said 2nd contact part in the said 1st contact part and the junction part with the said 1st contact part in the said 2nd contact part are each provided in two or more places. In the electrical storage module as described in any one of Claims 1-3 ,
The bus bar includes a third electrode joint portion that is joined by welding to an electrode terminal of a third power storage element disposed next to the second power storage element, and a third contact portion that rises from the third electrode joint portion. A third conductive plate having
The second conductive plate is a pair of second abutments that respectively rise from an end portion that constitutes one side of the second electricity storage element side of the second electrode joint portion and an end portion that constitutes one side of the third electricity storage element side. Part
One of the pair of second contact portions is joined to the first contact portion of the first conductive plate,
The other of the pair of second contact portions is a power storage module that is joined to the third contact portion of the third conductive plate. A power storage module in which a plurality of power storage elements are electrically connected by a bus bar,
The bus bar includes a first electrode plate having a first electrode joint portion welded to an electrode terminal of the first power storage element, a first contact plate rising from the first electrode joint portion, and the first power storage device. A second conductive plate having a second electrode joint portion joined by welding to an electrode terminal of a second energy storage device disposed next to the device, and a pair of second contact portions rising from the second electrode joint portion; A third electrode joining portion joined by welding to an electrode terminal of a third electricity storage element disposed next to the second electricity storage element, and a third contact portion rising from the third electrode joining portion. A conductive plate,
One of the first contact portion of the first conductive plate and the pair of second contact portions of the second conductive plate are joined together,
The other of the third contact portion of the third conductive plate and the pair of second contact portions of the second conductive plate is a power storage module joined to each other.

Images