WO2015178153A1

WO2015178153A1 - Electricity storage module and manufacturing method for electricity storage module

Info

Publication number: WO2015178153A1
Application number: PCT/JP2015/062294
Authority: WO
Inventors: 一晃松田; 正人齋藤
Original assignee: 旭化成Ｆｄｋエナジーデバイス株式会社
Priority date: 2014-05-21
Filing date: 2015-04-22
Publication date: 2015-11-26
Also published as: JPWO2015178153A1; JP6534656B2

Abstract

An electricity storage module provided with a plurality of electricity storage cells each comprising a container (23) which stores electricity, and a positive electrode terminal (21) and a negative electrode terminal (22) which protrude from the container (23), wherein a securing member (100) secured to the container (23) is disposed at one end in a lamination direction, the positive electrode terminal (21) and the negative electrode terminal (22) of the different electricity storage cells are laminated, the securing member (100) secured to the container (23) is disposed at one end in the lamination direction, and the electricity storage cells are connected in series or in parallel by welding the securing member (100) and the positive electrode terminal (21) and the negative electrode terminal (22) or the positive electrode terminals (21) or the negative electrode terminals (22) of the electricity storage cells adjacent to each other.

Description

Power storage module and method for manufacturing power storage module

The present invention relates to a power storage module and a method for manufacturing the power storage module.

In recent years, power storage modules using storage batteries such as lithium ion secondary batteries, nickel metal hydride batteries, electric double layer capacitors, or lithium ion capacitors have been developed. Such a power storage module has, for example, a power storage unit in which storage batteries are connected in series or in parallel, and can be charged / discharged in a high voltage or large capacity state. Yes.

Conventionally, as a method of connecting a plurality of storage battery terminals, there are a method of directly connecting terminals, a method of connecting terminals via a bus bar, and the like. Furthermore, when directly connecting the terminals of two cells, there is a method of overlapping the terminals and connecting them by welding, one of which is a laser welding method. When performing such laser welding, there is a possibility that the cell or other member may be damaged if the laser beam penetrating all the overlapped terminals is irradiated to the other member of the cell or the module. Therefore, for example, a welding method has been proposed so that laser light does not penetrate through the terminal on the opposite side to the laser irradiation among the stacked terminals.

JP 2003-338275 A International Publication No. 2006/016441

However, in both the direct connection between terminals and the connection via the bus bar, if vibration is applied to the power storage module for a long time, for example, when mounted on a vehicle, the phase of the terminal and the cell is shifted depending on the vibration, and the terminal or cell There is a risk of internal fatigue damage. In particular, when a heavy object such as a bus bar is fixed to the terminal, the stress inside the terminal or the cell increases, and the possibility of fatigue failure increases.

Also, when irradiating laser light, it is difficult to control the arrival depth of high energy density laser light that forms a keyhole in the thin plate like the terminal of the storage battery within the thickness of the terminal. And in the recent electrical storage module, a terminal tends to become thin, and control of laser irradiation increases as the terminal becomes thin.

In addition, as the energy of the laser beam applied to the terminal increases, the contact area between the terminals formed by the weld metal increases, and the connection of the terminal is formed with higher strength and lower resistance. However, if it is intended to obtain a welding resistance that does not affect the strength of the connection of the terminals and the performance of the storage battery, the risk of laser light penetrating through the terminal opposite to the laser irradiation increases.

Also, a jig that absorbs laser light between the surface opposite to the laser irradiation and the cell or other member in the terminal that is stacked so that the laser light is not irradiated to the cell or other member (hereinafter referred to as “underlaying jig”). ")") Is conceivable. However, in this case, the size of the module is increased in order to secure a space for inserting the receiving jig.

The disclosed technology has been made in view of the above, and an object of the present invention is to provide a small-sized power storage module and a method for manufacturing the power storage module, in which the welded portion of the terminal has high strength and low resistance.

The power storage module and the method for manufacturing a power storage module disclosed in the present application include, in one aspect, a power storage member that stores electricity, and a plurality of power storage cells that have a positive electrode terminal and a negative electrode terminal protruding from the power storage member. And the positive electrode terminal and the negative electrode terminal of the different power storage cells are stacked, a fixing member fixed to the power storage member is disposed at one end in the stacking direction, the fixing member, the positive electrode terminal and the negative electrode terminal, The storage cells are connected in series or in parallel by welding the positive terminals or the negative terminals of the adjacent storage cells.

According to one aspect of the power storage module and the method for manufacturing the power storage module disclosed in the present application, there is an effect that the welded portion of the terminal can be made high strength and low resistance while keeping the size small.

FIG. 1 is a perspective view of the power storage module according to the first embodiment. FIG. 2 is a side view of the power storage module according to the first embodiment. FIG. 3 is a front view of a storage cell having a one-sided terminal shape. FIG. 4 is a schematic diagram for explaining the connection of the storage cells according to the first embodiment. FIG. 5 is a diagram for explaining an irradiation state of laser light. FIG. 6 is a flowchart of the manufacturing process of the power storage module according to the first embodiment. FIG. 7 is a diagram of volume comparison of the power storage modules. FIG. 8 is a front view of a double-sided terminal type storage cell. FIG. 9 is a schematic diagram for explaining connection of power storage cells according to the second embodiment. FIG. 10 is a schematic diagram for explaining connection of the storage cells according to the third embodiment.

Hereinafter, embodiments of a power storage module and a method for manufacturing a power storage module disclosed in the present application will be described in detail with reference to the drawings. Note that the power storage module and the method for manufacturing the power storage module disclosed in the present application are not limited by the following embodiments.

FIG. 1 is a perspective view of a power storage module according to the first embodiment. FIG. 2 is a side view of the power storage module according to the first embodiment. The power storage module 1 shown in FIG. 1 includes a plurality of power storage cells 2, an end plate 31, an end plate 32, and a bracket 4. The power storage module 1 is, for example, a lithium ion capacitor module. Furthermore, the power storage module 1 includes a cell terminal fixing member 100 between the cells. In addition to the lithium ion capacitor module, a lithium ion battery module or an electric double layer capacitor module may be used.

The cell terminal fixing member 100 includes a metal plate 101, an insulating member 102, and a cell fixing member 103. The metal plate 101 is, for example, a single metal or an alloy mainly composed of aluminum, iron, or copper.

As will be described later, the metal plate 101 has a thickness that can be easily controlled so that the laser beam stays therein during laser welding, and has a thickness that prevents the power storage module 1 from becoming heavy. For example, the thickness of the metal plate 101 is preferably in the range of 0.3 mm to 5 mm, more preferably in the range of 0.3 mm to 3 mm.

Further, the insulating member 102 is, for example, a synthetic resin. In addition, the cell fixing member 103 is a metal simple substance or alloy mainly composed of aluminum, iron, or copper, or a synthetic resin. Synthetic resins here are urea resin, phenol resin, unsaturated polyester resin, polyurethane, alkyd resin, epoxy resin, melamine resin, polyethylene, polyvinyl chloride, polystyrene, polypropylene, methacrylic resin, polycarbonate, polyamide, polyacetal, fluorine resin, It may be a modified species. Further, these may be single or complex polymer alloys. Depending on the application, a synthetic resin called engineering plastic having excellent strength and heat resistance, for example, an alloy of a modified polyphenylene ether resin and a styrene resin or polypropylene may be used. In the present invention, as an example, polyurethane is used for the insulating member 102 and aluminum alloy A5052 is used for the cell fixing member 103.

The cell terminal fixing member 100 is configured as a member in which the metal plate 101 and the cell fixing member 103 are fixed to the insulating member 102 by insert molding or the like. The cell terminal fixing member 100 is an example of a “fixing member”. In addition to insert molding, each part may be made individually and fixed by fitting, bonding, screw fastening, or the like.

And the electrical storage module 1 has the some electrical storage cell 2 which sealed the electrode laminated body which laminated | stacked the positive electrode and the negative electrode in the container of a laminate material. In the power storage module 1, for example, the flat surfaces are overlapped with the cell fixing member 103 in a state where a double-sided tape is attached to the flat surface of each power storage cell 2, and the power storage cell 2 is fixed to the cell fixing member 103. However, although it fixed using the double-sided tape here, as long as the electrical storage cell 2 can be fixed to the cell fixing member 103, another method may be used, for example, an adhesive agent etc. may be used. Thereby, the electrical storage cell 2 does not move with respect to the cell fixing member 103. In addition, although the electrical storage module 1 of this embodiment showed the electrical storage module which mounted 12 electrical storage cells 2 as an example, for example, it is not limited to 12 sheets and what number may be sufficient.

FIG. 3 is a front view of a one-sided terminal type storage cell. The storage cell 2 is, for example, a lithium ion capacitor cell. The electricity storage cell 2 includes a container 23 that accommodates an electrode stack (not shown), a positive electrode terminal 21, and a negative electrode terminal 22. The electrode laminate is configured by laminating a positive electrode, a negative electrode, and a separator (not shown). The power generation element is one unit, and a plurality of units of power generation elements are stacked. In addition to the lithium ion capacitor, a lithium ion battery or an electric double layer capacitor may be used.

The positive electrode has, for example, a structure in which a positive electrode made of a material capable of reversibly supporting lithium ions is formed on a positive electrode current collector. The positive electrode current collector is a member for collecting current while supporting the positive electrode, and is formed using, for example, a conductive metal plate such as aluminum. The positive electrode current collector is formed in a rectangular shape in plan view and has a structure in which a tab protrudes from one of the four sides. The tab of the positive electrode current collector is connected to the positive electrode terminal 21.

The negative electrode has, for example, a structure in which a negative electrode made of a material capable of reversibly supporting lithium ions is formed on a negative electrode current collector. The negative electrode current collector is a member for collecting current while supporting the negative electrode, and is formed using a conductive metal plate such as copper, for example. The negative electrode current collector is formed in a rectangular shape in plan view, and has a structure in which a tab protrudes from one of the four sides. The tab of the negative electrode current collector is connected to the negative electrode terminal 22, for example.

The container 23 is, for example, a rectangular soft container made of an aluminum laminated film material obtained by laminating an aluminum foil with a resin film. Furthermore, the container 23 has a structure in which the electrode laminate is sealed together with an organic electrolyte containing lithium ions, for example. Since the container 23 seals the electrode laminate and the organic electrolyte, the surface portion of the container 23 has a shape in which the shape of the electrode laminate is raised near the center. The raised surface portion of the container 23 may be referred to as a cell main surface. In addition, as a layer structure of the aluminum laminate film material, PP (Polypropylene) layer, PPa (polyphthalamide) layer, AL (aluminum) layer, nylon layer, PET (from the inner layer to the outer layer of the storage cell 2 PolyEthyleneTerephthalate) layer. The layer structure of the aluminum laminate film material may be, for example, a PPa (polyphthalamide) layer, an AL (aluminum) layer, a nylon layer, and a PET (PolyEthylene Terephthalate) layer. The container 23 that houses the electrode stack is an example of the “power storage member”.

Further, the storage cell 2 has a structure in which the positive electrode terminal 21 and the negative electrode terminal 22 protrude from one side of the four sides of the rectangular shape when the electrode stack is accommodated in the container 23. The storage cell 2 having such a shape is referred to as a one-sided terminal shape.

The positive terminal 21 is made of, for example, an aluminum material. The negative electrode terminal 22 is made of, for example, a copper material. The stacked power storage cells 2 are connected in series by connecting the positive electrode terminal 21 and the negative electrode terminal 22. The positive electrode terminal 21 and the negative electrode terminal 22 have a thickness of about 0.3 mm and a width of about 68 mm, for example.

FIG. 4 is a schematic diagram for explaining the connection of the storage cells according to the first embodiment. As shown in FIG. 4, the positive electrode terminal 21 and the negative electrode terminal 22 are bent at substantially right angles toward the connected storage cell 2.

Then, the positive electrode terminal 21 and the negative electrode terminal 22 bent so that the positive electrode terminal 21 is closer to the container 23 are overlapped. Below, the direction which goes to the container 23 from the positive electrode terminal 21 and the negative electrode terminal 22 is made into the bottom, and conversely, the direction which goes to the positive electrode terminal 21 and the negative electrode terminal 22 from the container 23 is made into the upper side. That is, the positive electrode terminal 21 and the negative electrode terminal 22 are overlapped so that the positive electrode terminal 21 faces down and the negative electrode terminal 22 faces up. Further, the positive electrode terminal 21 is bent so that the lower surface is in contact with the metal plate 101.

Here, in FIG. 4, the insulating member 102 is in contact with the container 23 of the storage cell 2, but the insulating member 102 may be insulated between the metal plate 101 and the cell fixing member 103. The container 23 and other members may not be in contact with each other.

The positive electrode terminal 21, the negative electrode terminal 22, and the metal plate 101 are pressed together with, for example, a jig (hereinafter referred to as an “upper pressing jig”) from above, and each is crimped. Pressed. The pressing value may be a value that allows the positive electrode terminal 21 and the negative electrode terminal 22 to be in close contact with each other. If each part can be processed with high accuracy, the pressing force may be lightly suppressed, for example, a force of about several hundred gf. You can suppress it. Further, since a processing tolerance is always generated according to a general processing method, the positive electrode terminal 21 and the negative electrode terminal 22 can be brought into close contact with each other by pressing with a force of about 1 kgf to 10 kgf, for example.

In this state, the laser beam 200 is irradiated from the upper side toward the negative terminal 22 as shown in FIG. The laser beam 200 is controlled so as to penetrate the negative electrode terminal 22 and the positive electrode terminal 21 and reach the inside of the metal plate 101. FIG. 5 is a diagram for explaining an irradiation state of laser light.

Here, as described above, the metal plate 101 is thicker than the positive electrode terminal 21 and the negative electrode terminal 22, and it is easy to control the laser beam 200 so that it stops inside and does not penetrate. Therefore, during laser welding, the laser beam 200 is controlled so that the depth of arrival is within the thickness of the metal plate 101. The irradiated laser beam 200 is absorbed inside the metal plate 101 and stops inside without penetrating the metal plate. The depth of arrival can be determined by observing the cross section of each part after welding and evaluating the depth to which the metal has substantially melted. Cross-sectional observation can be observed with an optical microscope, SEM (scanning electron microscope), or the like.

As described above, the laser beam 200 does not penetrate the metal plate 101, so that the metal does not melt. Therefore, it is not necessary to provide a space for inserting a receiving jig for receiving molten metal between the positive electrode terminal 21 and the container 23. In addition, by not using the lower receiving jig, the overall size of the power storage module 1 can be kept small, and further processing such as cleaning of the lower receiving jig can be omitted, and the manufacturing process can be simplified. .

Further, since the metal does not melt, the underfill is improved, and the connection strength between the positive electrode terminal 21 and the negative electrode terminal 22 is improved.

Further, the welded portion in laser welding has a three-layer structure of the positive electrode terminal 21, the negative electrode terminal 22 and the metal plate 101, so that the positive electrode terminal 21 and the negative electrode terminal 22 are penetrated even when irradiated with the high-energy laser beam 200. The laser beam 200 stopped in the metal plate 101. Thus, since welding with high energy is possible, the contact area between the positive electrode terminal 21 and the negative electrode terminal 22 increases, and a high-strength and low-resistance weld can be formed.

Further, the welded positive electrode terminal 21 and negative electrode terminal 22 are fixed to the container 23 via the metal plate 101, the insulating member 102, and the cell fixing member 103. Thereby, when the electrical storage module 1 vibrates, the phases of the positive electrode terminal 21 and the negative electrode terminal 22 and the container 23 coincide with each other. Thereby, the phase shift between the positive electrode terminal 21 and the negative electrode terminal 22 and the container 23 is suppressed, and the repeated stress on the positive electrode terminal 21, the negative electrode terminal 22 or the container 23 due to the phase shift is reduced, so that the vibration resistance is improved. be able to.

Returning to FIGS. 1 and 2, the description will be continued. The stacked power storage cells 2 are connected in series by the laser welding described above.

Two brackets 4 are arranged so as to hold down two sides orthogonal to the side where the positive electrode terminal 21 and the negative electrode terminal 22 of the container 23 in the stacked storage cell 2 are arranged. Further, the

end plates

31 and 32 are fixed to the bracket 4 and hold the storage cell 2 while sandwiching the storage cell 2 from the stacking direction and applying pressure.

Next, with reference to FIG. 6, the manufacturing process of the electrical storage module 1 according to the present embodiment will be described. FIG. 6 is a flowchart of the manufacturing process of the power storage module according to the first embodiment.

The worker fixes the metal plate 101, the insulating member 102, and the cell fixing member 103 by insert molding or the like, and generates the cell terminal fixing member 100 (step S1).

Next, the operator fixes the cell fixing member 103 to the container 23 (step S2). Thereby, the cell terminal fixing member 100 is fixed to the electricity storage cell 2.

Next, the operator stacks the storage cells 2, and further overlaps the positive electrode terminal 21 and the negative electrode terminal 22 from the container 23 side, and the positive electrode terminal 21 and the negative electrode so that the positive electrode terminal 21 is in contact with the metal plate 101. The terminal 22 is bent (step S3).

Next, the worker attaches the

end plates

31 and 32 and the bracket 4 to the stacked power storage cells 2, and holds the power storage cells 2 by the

end plates

31 and 32 and the bracket 4 (step S4).

Next, the operator presses the negative electrode terminal 22 from the opposite direction to the insulating member 102 with the upper pressing jig (step S5). As a result, the bent negative electrode terminal 22, positive electrode terminal 21, and metal plate 101 are pressed toward the insulating member 102.

Next, the operator controls the laser beam to stop within the metal plate 101, irradiates the laser beam toward the negative electrode terminal 22, and welds the negative electrode terminal 22 and the positive electrode terminal 21 (step S6).

As described above, in the power storage module according to this embodiment, the container and the terminal of the power storage cell are fixed by the cell terminal fixing member. Thereby, even if a vibration is applied to the power storage module, the phases of the terminal and the container coincide with each other, and the repetitive stress to the terminal or the cell is reduced. That is, vibration resistance can be improved. In particular, when the container is a laminate, the power storage module 1 according to the present embodiment can greatly contribute to the improvement of vibration resistance.

Furthermore, the welded portion can be made into a three-layer structure with two terminals and a metal plate provided on the cell terminal fixing member, and the laser beam can be stopped within the metal plate even when irradiated with a high-energy laser beam. . Therefore, welding with high energy can be performed, the contact area between the terminals can be increased, and a high strength and low resistance weld can be formed.

Furthermore, since no metal melts out, there is no risk of the molten metal adhering to the container or other members, and there is no need to arrange a receiving jig between the terminal and the container to prevent adhesion. Thus, the storage module can be reduced in size by not providing a space for the support jig.

For example, FIG. 7 is a diagram of volume comparison of power storage modules. The row described as the comparative example of FIG. 7 represents the volume of the electrical storage module manufactured using the receiving jig. Moreover, the line described as an Example represents the volume of the electrical storage module 1 manufactured using the manufacturing method which concerns on a present Example. Furthermore, the line described as the rate of change represents how much the volume of the example has changed relative to the volume of the comparative example. Furthermore, there are two items, the one-side terminal shape and the two-sided terminal shape. Here, the case of the one-sided angel-shaped storage cell 2 will be described, and the case of the two-sided terminal-shaped storage cell will be described later.

FIG. 7 shows a case where measurement is performed using the following conditions. That is, it is assumed that the storage cell 2 has a cell thickness of 10 mm, a cell width of 100 mm, and a cell height of 100 mm in both the example and the comparative example. Furthermore, in the case of the comparative example, the terminal height is 15 mm. Moreover, in the case of an Example, terminal height is 5 mm and the thickness of the cell fixing member 103 is 0.3 mm.

When the power storage module 1 using the one-side terminal-shaped power storage cell 2 is manufactured using a receiving jig, the volume of the power storage module 1 is 1185 cc. On the other hand, when the power storage module 1 using the one-sided terminal-shaped power storage cell 2 is manufactured using the manufacturing method according to the present embodiment, the volume of the power storage module 1 is 1082 cc. The rate of change in volume is -8.7%. Thus, it turns out that the direction which manufactures the electrical storage module 1 using the manufacturing method which concerns on a present Example can make a volume small, and can reduce in size compared with the case where it manufactures using a receiving jig. .

(Modification)
Next, a modified example will be described. In the first embodiment, the one-side terminal-shaped storage cell 2 in which the positive electrode terminal 21 and the negative electrode terminal 22 are provided on one side of the rectangular container 23 has been described. However, the positions of the positive electrode terminal 21 and the negative electrode terminal 22 are the same. Not limited to.

FIG. 8 is a front view of a double-sided terminal type storage cell. The power storage module 1 of this modification uses a power storage cell 2 in which a positive electrode terminal 21 is provided on one side of a rectangular container 23 as shown in FIG. 8 and a negative electrode terminal 22 is provided on a side opposite to the side. Such a storage cell 2 is referred to as a double-sided terminal shape.

Even in the case of the battery cell 2 having the both-side terminal shape, the container 23 is fixed to the cell fixing member 103 and the positive electrode terminal 21 and the negative electrode terminal 22 are welded and fixed together with the metal plate 101 as in the first embodiment. Thus, the container 23, the positive electrode terminal 21, and the negative electrode terminal 22 are fixed.

However, in the case of the electricity storage cell 2 having a both-side terminal shape, since the positive electrode terminal 21 and the negative electrode terminal 22 are provided on opposite sides, welding is performed on each side. In this case, the cell terminal fixing member 100 may have the insulating member 102 and the metal plate 101 at both ends of the cell fixing member 103. Moreover, you may use the cell terminal fixing member 100 which has the insulating member 102 and the metal plate 101 in the end of the cell fixing member 103 one by one on the side of each side which faces.

And even if it is the electrical storage module 1 using the electrical storage cell 2 of a both-sides terminal shape, it has an effect similar to Example 1. FIG.

For example, as shown in FIG. 7, when the power storage module 1 using the power storage cells 2 having the both-side terminal shape is manufactured using a support jig, the volume of the power storage module 1 is 1339 cc. On the other hand, when the electrical storage module 1 using the electrical storage cell 2 having the both-side terminal shape is manufactured using the manufacturing method according to this embodiment, the volume of the electrical storage module 1 is 1133 cc. The volume change rate is -15.4%. Thus, even in the case of this modification, it can be seen that the volume can be reduced and the size can be reduced as compared with the case of manufacturing using the receiving jig.

FIG. 9 is a schematic diagram for explaining connection of power storage cells according to the second embodiment. In the first embodiment, the cell fixing member 103 is disposed so as to be sandwiched between the containers 23 of the storage cells 2, but the present invention is not limited thereto, and the cell fixing member 103 is fixed to the container 23, and the metal plate 101 is a positive electrode terminal. What is necessary is just to be welded and fixed to 21 and the negative electrode terminal 22.

Therefore, in the present embodiment, a configuration in which the arrangement of the cell terminal fixing member 100 with respect to the storage cell 2 is different from that in the first embodiment will be described.

In the power storage module 1 according to the present embodiment, the surfaces of the containers 23 of the power storage cells 2 are fixed with an adhesive tape, an adhesive, or the like.

The cell fixing member 103 is fixed to the opposite surface of the one container 23 of the two storage cells 2 that are fixed.

The insulating member 102 is disposed on the surface of the cell fixing member 103 to which the container 23 is bonded, and is fixed to the cell fixing member 103.

The metal plate 101 is disposed on the surface of the insulating member 102 opposite to the cell fixing member 103 and is fixed to the insulating member 102.

The positive electrode terminal 21 extends from the container 23 bonded to the cell fixing member 103 to the surface of the metal plate 101 opposite to the insulating member 102. Further, the negative electrode terminal 22 extends from the container 23 not bonded to the cell fixing member 103 to the position of the metal plate 101 so as to overlap the surface of the positive electrode terminal 21 opposite to the metal plate 101.

The superposed positive electrode terminal 21, negative electrode terminal 22 and metal plate 101 are irradiated with laser light controlled to stop within the metal plate 101 from the negative electrode terminal 22 side and welded. Thereby, the positive electrode terminal 21 and the negative electrode terminal 22 are fixed to the metal plate 101.

Even in the state shown in FIG. 9, the positive electrode terminal 21 and the negative electrode terminal 22 are bonded to the cell fixing member 103 through the metal plate 101, the insulating member 102, and the cell fixing member 103. And are fixed. Further, the positive electrode terminal 21 and the negative electrode terminal 22 are also fixed to the other container 23 via the container 23 fixed to the cell fixing member 103.

As described above, even in the power storage module according to the present embodiment, even when vibration is applied to the power storage module, a phase shift between each terminal and the container does not occur, and repeated to the inside of the terminal or the cell. Stress is reduced. That is, vibration resistance can be improved.

Also, laser welding is the same as in Example 1, and a high-strength and low-resistance weld can be generated, and the power storage module can be downsized.

FIG. 10 is a schematic diagram for explaining connection of power storage cells according to the third embodiment. In the present embodiment, the arrangement of the cell terminal fixing member 100 with respect to the storage cell 2 is a configuration other than the first embodiment and the second embodiment.

In the power storage module 1 according to the present embodiment, the containers 23 of the two power storage cells 2 are mounted and fixed on one surface of the cell fixing member 103 so that the positive electrode terminal 21 and the negative electrode terminal 22 face each other.

The insulating member 102 is fixed between the two containers 23 on the surface on which the container 23 of the cell fixing member 103 is mounted.

The positive terminal 21 extends from one of the opposing containers 23 to the surface of the metal plate 101 opposite to the insulating member 102. Further, the negative electrode terminal 22 extends from the other container 23 to the position of the metal plate 101 so as to overlap the surface of the positive electrode terminal 21 opposite to the metal plate 101.

Even in the state shown in FIG. 10, the positive electrode terminal 21 and the negative electrode terminal 22 are fixed to the container 23 via the metal plate 101, the insulating member 102, and the cell fixing member 103.

In the above description, the structure in which the positive electrode terminal 21, the negative electrode terminal 22, and the metal plate 101 are welded mainly by laser welding has been described. However, in addition to laser welding, each component can also be obtained by a method such as resistance welding. May be welded.

In the above description, the case where the positive electrode terminal 21 and the negative electrode terminal 22 are made of different materials has been described. However, the positive electrode terminal and the negative electrode terminal may be made of the same material.

Moreover, although the above description demonstrated the case where the positive electrode terminal 21 and the negative electrode terminal 22 were mainly welded and connected in series, the positive electrode terminals 21 of the adjacent electrical storage cell 2 or the negative electrode terminals 22 were welded, and it paralleled. The effect of the present invention is also manifested in the case of connection to the same.

DESCRIPTION OF SYMBOLS 1 Power storage module 2 Power storage cell 4 Bracket 21 Positive electrode terminal 22 Negative electrode terminal 23

Container

31, 32 End plate 100 Cell terminal fixing member 101 Metal plate 102 Insulating member 103 Cell fixing member

Claims

A power storage member that stores electricity, and a plurality of power storage cells having a positive electrode terminal and a negative electrode terminal protruding from the power storage member,
The positive electrode terminal and the negative electrode terminal of the different power storage cells are stacked, a fixing member fixed to the power storage member is disposed at one end in the stacking direction, and the fixing member, the positive electrode terminal and the negative electrode terminal are adjacent to each other The power storage modules are connected in series or in parallel by welding the positive terminals or the negative terminals of the power storage cells.
The fixing member includes a metal plate, an insulating member, and a cell fixing member,
The metal plate is in contact with the one end of the stacked positive electrode terminal and the negative electrode terminal in the stacking direction,
The cell fixing member is fixed to the power storage member,
The power storage module according to claim 1, wherein the insulating member is disposed between the metal plate and the cell fixing member.
3. The welding according to claim 1, wherein the welding is performed by irradiating a laser beam from a side of the stacked positive electrode terminal or the negative electrode terminal, and performing laser welding with a depth reaching the inside of the fixing member. Power storage module.
3. The power storage module according to claim 2, wherein the metal plate is a single metal or an alloy mainly composed of aluminum, iron, or copper.
3. The power storage module according to claim 2, wherein the insulating member is an insulator mainly composed of a synthetic resin.
3. The power storage module according to claim 2, wherein the cell fixing member is a metal simple substance or alloy mainly composed of aluminum or iron, or a synthetic resin.
The power storage module according to claim 1, wherein the positive electrode terminal and the negative electrode terminal are made of the same material.
The power storage module according to claim 1, wherein the positive electrode terminal and the negative electrode terminal are made of different materials.
The power storage module according to claim 8, wherein the positive electrode terminal is made of a material mainly composed of aluminum.
The power storage module according to claim 8, wherein the negative electrode terminal is made of a material mainly composed of copper.
A method for producing a power storage module having a plurality of power storage cells having a power storage member for storing electricity, and a positive electrode terminal and a negative electrode terminal protruding from the power storage member,
Laminating the positive electrode terminal and the negative electrode terminal of the different storage cells,
A fixing member fixed to the power storage member is disposed at one end in the stacking direction,
The power storage cell is characterized in that the power storage cells are connected in series or in parallel by welding the fixing member, the positive electrode terminal and the negative electrode terminal, or the positive electrode terminals or the negative electrode terminals of the adjacent energy storage cells. Module manufacturing method.