Energy storage module

Abstract

An electrical storage module comprising a plurality of electrical storage devices and a bus bar connecting electrode terminals of the respective electrical storage devices. The electrical storage devices each include an exterior can having an opening formed therein, and a plate-like seal assembly fitted with an electrode terminal and inserted into the opening of the exterior can. The electrode terminal includes a container portion comprising a through-hole or a recess formed along a direction substantially orthogonal to a direction in which the seal assembly is inserted into the exterior can. The bus bar includes a press-in portion pressed into the container portion.

Description

Technical Field

[0001] The present disclosure relates to a power storage module.

Background Art

[0002] It is known to use a power storage module in which a plurality of power storage devices are electrically connected by a bus bar to obtain a predetermined energy capacity. For example, in the power storage module disclosed in Patent Document 1, a bus bar for connecting the respective electrode terminals of a plurality of power storage devices is provided, and when the bus bar is attached to the electrode terminal, the bus bar is joined to the electrode terminal by welding.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] However, when attaching the bus bar to the electrode terminal in the above power storage module, if joined by welding, it is difficult to disassemble the power storage device and the bus bar and reassemble the power storage module during the process of manufacturing the power storage module.

[0005] An object of the present disclosure is to provide a power storage module that can be reassembled.

Means for Solving the Problems

[0006] A power storage module according to one aspect of the present disclosure includes a plurality of power storage devices and a bus bar that connects the electrode terminals of each of the power storage devices. The power storage device has an exterior can with an opening formed therein, and a plate-shaped sealing body provided with electrode terminals and inserted into the opening of the exterior can. The electrode terminal has a housing portion formed of a through hole or a recess formed along a direction substantially orthogonal to the direction in which the sealing body is inserted into the exterior can. The bus bar has a press-fitting portion that is press-fitted into the housing portion when the bus bar is attached to the electrode terminal.

Advantages of the Invention

[0007] According to one aspect of the present disclosure, it becomes easier to remove the bus bar from the electrode terminal as compared with a power storage module in which the bus bar and the electrode terminal are joined by welding. Further, by press-fitting the press-fitting portion of the bus bar into the electrode terminal, the connection resistance between the bus bar and the electrode terminal can be reduced. Furthermore, by making the direction in which the press-fitting portion is press-fitted into the housing portion of the electrode terminal different from the direction in which the sealing body is inserted into the exterior can, mechanical stress generated at the joint portion between the sealing body and the case when the press-fitting portion is press-fitted into the housing portion can be suppressed.

Brief Description of the Drawings

[0008]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

Figure 6

Figure 7

Figure 8

Modes for Carrying Out the Invention

[0009] Hereinafter, embodiments of the present disclosure will be described with reference to the drawings. The shapes, materials, and numbers described below are examples and can be appropriately changed according to the specifications of the power storage module. In the following, the same reference numerals will be given to equivalent elements in all the drawings for explanation.

[0010] Hereinafter, for convenience of explanation, the direction in which the sealing body is inserted into the opening of the outer can is defined as the vertical direction, the direction substantially orthogonal to the vertical direction in which the storage portion of the electrode terminal is formed is defined as the width direction, and the direction substantially orthogonal to the vertical direction and the width direction and in which the power storage devices are arranged in the power storage module is defined as the depth direction for explanation.

[0011] Using FIG. 1, a power storage module 10 which is an example of an embodiment will be described. FIG. 1 is a perspective view showing the power storage module 10.

[0012] The power storage module 10 is used, for example, as a driving power source for an electric vehicle or a hybrid vehicle, or as a stationary power storage system for peak shifting of grid power. As shown in FIG. 1, the power storage module 10 includes a plurality of power storage devices 20 arranged side by side in the depth direction, a bus bar 40 that connects the positive electrode terminals 31 or the negative electrode terminals 32 (see FIG. 2) of the power storage devices 20 to each other, and a fixing member 50 that connects the positive electrode terminal 31 to the bus bar 40 or the negative electrode terminal 32 to the bus bar 40.

[0013] Using FIG. 2, a power storage device 20 which is an example of an embodiment will be described. FIG. 2 is a sectional view taken along line AA of FIG. 1.

[0014] The power storage device 20 is a non-aqueous electrolyte secondary battery, and a preferred example is a lithium ion battery. Note that the power storage device 20 may also be a nickel metal hydride battery, an electric double layer capacitor, or the like. As shown in FIG. 2, the power storage device 20 includes an electrode body 21 in which a positive electrode plate and a negative electrode plate are laminated via a separator, an outer can 22 that houses the electrode body 21 and the electrolyte, and a sealing body 23 that is inserted into the opening 22A of the outer can 22 from above in the vertical direction to close the opening.

[0015] The electrode body 21 is formed by laminating a substantially rectangular sheet-shaped positive electrode plate, a negative electrode plate, and a separator. The laminated positive electrode plate, negative electrode plate, and separator may be bonded and fixed to the separator by applying an adhesive to the surface of the separator facing the positive electrode plate or the negative electrode plate and restraining them using a fixing tape. Further, the electrode body 21 is housed in an insulating holder 24 having a bottom and an open upper end and having a substantially rectangular parallelepiped shape. The electrode body 21 is disposed in the outer can 22 such that the lamination direction in which the positive electrode plate and the negative electrode plate are laminated is parallel to the depth direction of the outer can 22. Note that the electrode body 21 may be formed by winding a strip-shaped positive electrode plate and a strip-shaped negative electrode plate with a strip-shaped separator interposed therebetween to form a wound body, and flattening this wound body to form a flat wound body. At this time, the lamination direction of the electrode body 21 may be the thickness direction of the flat wound body.

[0016] The positive electrode plate has, for example, a core made of an aluminum foil with a thickness of 15 μm, electrode layers formed on the front and back surfaces of the core, a core exposed portion where no electrode layer is formed in the core, and a positive electrode lead 25 that is a part of the core exposed portion and extends from the upper end of the core exposed portion.

[0017] The positive electrode layer contains, for example, an active material, a conductive agent, and a binder. As the active material of the positive electrode, lithium nickel cobalt manganese composite oxide can be used, as the binder, polyvinylidene fluoride (PVdF) can be used, as the conductive agent, a carbon material can be used, and as the dispersion medium, N-methylpyrrolidone (NMP) can be used. When forming the electrode layer, a slurry containing these active material, conductive agent, binder, and dispersant is prepared. This slurry is applied to both surfaces of the core of the positive electrode. Then, by drying this, the dispersion medium in the slurry is removed, and an electrode layer is formed on the core. Thereafter, the electrode layer is compressed to a predetermined thickness. The positive electrode plate thus obtained is cut into a predetermined shape.

[0018] The negative electrode plate has, for example, a core made of a copper foil with a thickness of 8 μm, electrode layers formed on the front and back surfaces of the core, a core exposed portion where no electrode layer is formed in the core, and a negative electrode lead 26 that is a part of the core exposed portion and extends from the upper end of the core exposed portion.

[0019] The negative electrode layer includes, for example, an active material, a conductive agent, a binder, and a thickener. As the active material of the negative electrode, graphite can be used; as the binder, styrene-butadiene rubber (SBR) can be used; as the thickener, carboxymethyl cellulose (CMC) can be used; and as the dispersion medium, water can be used. When forming the electrode layer, a slurry containing these active material, conductive agent, binder, and thickener is prepared. This slurry is applied to both sides of the core body of the negative electrode. Then, by drying it, the dispersion medium in the slurry is removed, and an electrode layer is formed on the core body. Thereafter, the electrode layer is compressed to a predetermined thickness. The negative electrode plate thus obtained is cut into a predetermined shape.

[0020] As the separator, for example, a resin one can be used, and as the resin, polyolefin, polyethylene, or polypropylene can be used.

[0021] The positive electrode lead 25 is electrically connected to the positive electrode terminal 31 provided on the sealing body 23 via the current collecting member 27. The positive electrode leads 25 are provided in the number corresponding to the number of positive electrode plates constituting the electrode body 21. The plurality of positive electrode leads 25 are respectively joined to the current collecting member 27 in a bundled state at the tip side in the extending direction. When joining the positive electrode lead 25 to the current collecting member 27, ultrasonic welding, resistance welding, laser welding, cold pressure welding, etc. can be performed for joining.

[0022] The negative electrode lead 26 is electrically connected to the negative electrode terminal 32 provided on the sealing body 23 via the current collecting member 28. The negative electrode leads 26 are provided in the number corresponding to the number of negative electrode plates constituting the electrode body 21. The plurality of negative electrode leads 26 are respectively joined to the current collecting member 28 in a bundled state at the tip side in the extending direction. When joining each negative electrode lead 26 to the current collecting member 28, ultrasonic welding, resistance welding, laser welding, cold pressure welding, etc. can be performed for joining.

[0023] The current collector member 27 of the positive electrode is composed of, for example, a plate made of aluminum. The current collector member 27 is connected to the positive electrode lead 25 at one end and to the positive electrode terminal 31 at the other end. An insulating member 33 is interposed between the current collector member 27 and the sealing body 23.

[0024] The positive electrode terminal 31 and the current collector member 27 may be electrically connected via a current interruption device (CID). This CID is a safety device that can cut off the electrical connection between the current collector member 27 and the positive electrode terminal 31 when gas is generated inside the outer can 22 during an abnormality of the power storage device 20 and the pressure inside the outer can 22 exceeds a predetermined value. The CID has, for example, an inversion plate that is connected to the other end of the current collector member 27 and deforms in a direction away from the current collector member 27 when receiving the pressure inside the outer can 22, and a conductive cap that electrically connects the inversion plate and the positive electrode terminal 31. The conductive cap is a dish-shaped conductive member with an opening located on the lower side (the side of the electrode body 21) and an upper surface located on the upper side (the side of the sealing body 23). A connection hole is formed in the upper surface, and the positive electrode terminal 31 is inserted therein.

[0025] The current collector member 28 of the negative electrode is composed of, for example, a plate made of copper. The current collector member 28 is connected to the negative electrode lead 26 at one end and to the negative electrode terminal 32 at the other end. An insulating member 34 is interposed between the current collector member 28 and the sealing body 23.

[0026] The outer can 22 is, for example, a square case having a bottom 22B, a rectangular tube-shaped side wall portion erected from the periphery of the bottom 22B, and an opening 22A formed at an end on the side opposite to the bottom 22B (the upper side in the vertical direction). The outer can 22 is made of, for example, a metal such as aluminum. The outer can 22 can be formed by, for example, drawing an aluminum material.

[0027] In the sealing body 23, the positive electrode terminal 31 and the negative electrode terminal 32 are arranged apart from each other in the longitudinal direction (width direction) of the sealing body 23. The positive electrode terminal 31 and the negative electrode terminal 32 project upward in the vertical direction and project from the top surface of the sealing body 23. The sealing body 23 is formed, for example, by processing an aluminum plate. The sealing body 23 is located on the opening 22A of the outer can 22, and the sealing body 23 can seal the inside of the outer can 22 by forming a joint portion by welding, for example, with a laser or the like at the open end of the outer can 22.

[0028] The sealing body 23 may have a liquid injection hole for injecting the electrolytic solution into the outer can 22. A liquid injection plug for closing the liquid injection hole may be provided in the sealing body 23. Further, the sealing body 23 is constituted by being surrounded by a plurality of linear grooves, and a pressure regulating valve 36 for exhausting the gas in the outer can 22 to the outside by tearing the grooves when the pressure in the outer can 22 exceeds a predetermined pressure may be provided. Further, it is preferable to form an annular groove along the periphery on the top surface of the sealing body 23. With this configuration, when the sealing body 23 and the opening 22A of the outer can 22 are welded and joined, the periphery of the sealing body 23 can be efficiently melted.

[0029] The positive electrode terminal 31 is provided through the terminal hole of the sealing body 23, one end projects outside the outer can 22, and the other end is accommodated inside the outer can 22. In the positive electrode terminal 31, the other end is inserted into a connection hole provided on the upper surface of the conductive cap, and the other end of the positive electrode terminal 31 is caulked so as to spread in the radial direction and is fixed to the conductive cap. The positive electrode terminal 31 is constituted by, for example, an aluminum column or a cylinder.

[0030] The negative electrode terminal 32 is provided through the terminal hole of the sealing body 23, one end is exposed outside the outer can 22, and the other end is accommodated inside the outer can 22. The negative electrode terminal 32 may be constituted by a clad material in which, for example, the other end connected to the current collecting member 28 inside the outer can 22 is made of a copper material, and one end exposed outside the outer can 22 is made of aluminum. At the other end, the negative electrode terminal 32 is caulked so as to spread in the radial direction and is fixed to the sealing body 23 together with the current collecting member 28.

[0031] Hereinafter, when describing the features common to the positive electrode terminal 31 and the negative electrode terminal 32, they will be simply described as the electrode terminal 30.

[0032] The electrode terminal 30, which is an example of this embodiment, will be described with reference to FIGS. 3 to 5. FIG. 3 is a perspective view showing the electrode terminal 30, and FIG. 4 is a CC cross-sectional view of FIG. 3.

[0033] As shown in FIG. 3, the electrode terminal 30 is provided so as to project above the power storage device 20 in the vertical direction. Further, the electrode terminal 30 has a housing portion 30A formed of a through hole or a recess formed along the width direction. As shown in FIG. 4, the cross-sectional shape perpendicular to the direction in which the housing portion 30A extends (the width direction of the power storage device, or in the case of a bottomed housing portion, the direction connecting the opening and the bottom of the housing portion; if the housing portion is a through hole, the direction connecting the openings at both ends) may be rectangular. Also, the cross-sectional shape perpendicular to the vertical direction of the housing portion 30A may be rectangular. The cross-sectional shape perpendicular to the vertical direction of the housing portion 30A may be formed such that the opening end on the outer side in the width direction (the insertion side of the press-fitting portion 40A) is wide. Thereby, the press-fitting portion 40A can be easily press-fitted. Also, the cross-sectional shape perpendicular to the vertical direction of the housing portion 30A may be a tapered shape, for example, a trapezoid or a triangle.

[0034] As shown in FIG. 5, the electrode terminal 30 includes, for example, a base portion 30B formed in a flat plate shape and a terminal portion 30C formed in a cylindrical shape. As a manufacturing method of the electrode terminal 30, for example, a recess or the like is formed in the bottom surface portion of the terminal portion 30C by cutting or casting, etc., and the bottom surface portion of the terminal portion 30C and the base portion 30B are joined by welding, and the recess or through hole defined by the recess and the base portion 30B may be used as the housing portion 30A. In this electrode terminal 30, the processing for forming the housing portion 30A in the terminal portion 30C becomes easy. Welding is preferably spot welding at a plurality of locations, for example. Note that the electrode terminal 30 may be formed by forming the housing portion 30A by cutting or the like on a conductive member in which the terminal portion 30C and the base portion 30B are integrated. Also, a lower flange portion (not shown) may be formed on the outer peripheral surface of the terminal portion 30C on the base portion 30B side, and the lower flange portion and the base portion 30B may be joined by welding or the like.

[0035] With reference to FIGS. 5 and 6, the bus bar 40, which is an example of the present embodiment, will be described. FIG. 5 is a perspective view showing the bus bar 40. FIG. 6 is a cross-sectional view taken along line BB of FIG. 1.

[0036] The bus bar 40 is a conductor used for electrical connection between the positive electrode terminals 31 or the negative electrode terminals 32. As shown in FIG. 5, the bus bar 40 is formed by bending a long metal plate having conductivity. The bus bar 40 is detachable from the electrode terminal 30 from the outside in the width direction of the plurality of power storage devices 20. The bus bar 40 has a press-fitting portion 40A that is press-fitted into the accommodating portion 30A of the electrode terminal 30, and a connecting portion 40B that connects adjacent press-fitting portions 40A to each other.

[0037] As shown in FIG. 5, before attaching the bus bar 40 to the electrode terminal 30 (before press-fitting the press-fitting portion 40A into the accommodating portion 30A), the press-fitting portion 40A may be formed by folding the metal plate forming the press-fitting portion 40A so as to be substantially V-shaped when viewed from the vertical direction. When attaching the bus bar 40 to the electrode terminal 30, the press-fitting portion 40A is press-fitted into the accommodating portion 30A.

[0038] Press-fitting means pushing the press-fitting portion 40A into the accommodating portion 30A in the width direction with a pressure equal to or greater than a predetermined value. In order to press-fit the press-fitting portion 40A into the accommodating portion 30A, it is preferable that the size of the press-fitting portion 40A in the depth direction before press-fitting is larger than the size of the accommodating portion 30A in the depth direction. The press-fitting portion 40A press-fitted into the accommodating portion 30A is sandwiched between a pair of inner surfaces facing each other in the depth direction in the accommodating portion 30A. At this time, a pair of metal plates constituting the press-fitting portion exert a reaction force on the pair of inner surfaces due to flexibility (or elasticity or springiness) in the depth direction. As a result, the press-fitting portion 40A and the pair of inner surfaces of the accommodating portion 30A press against each other. Therefore, the connection resistance between the press-fitting portion 40A and the accommodating portion 30A is reduced.

[0039] As a result, when attaching the bus bar 40 to the electrode terminal 30, although a load of a predetermined value or more acts in the width direction by press-fitting, the load is suppressed from acting in the vertical direction (the direction in which the sealing body 23 is inserted into the outer can 22). Therefore, it is possible to suppress mechanical stress from being applied to the joint portion formed by welding between the outer can 22 and the sealing body 23.

[0040] In addition, since the bus bar 40 is detachable from the electrode terminal 30, it is possible to rework the operation of attaching the bus bar 40 to the electrode terminal 30 in the manufacturing process of the power storage module 10. Further, it is possible to reuse the bus bar 40 when the power storage module 10 is discarded.

[0041] As described above, the connecting portion 40B is a portion that connects the adjacent press-fitting portions 40A. A hole portion 40C into which the insertion portion 50B of the fixing member 50 is inserted is formed on the side of the connecting portion 40B close to the press-fitting portion 40A. The hole portion 40C is preferably formed in a rectangular shape.

[0042] As shown in FIG. 6, after attaching the bus bar 40 to the electrode terminal 30 (after press-fitting the press-fitting portion 40A into the accommodating portion 30A), the metal plates forming the press-fitting portion 40A are press-fitted into the accommodating portion 30A in a state where they are closed. In this state, due to the restoring force that the metal plates forming the press-fitting portion 40A try to return from the closed state to a V shape, the metal plates forming the press-fitting portion 40A and the inner surface of the accommodating portion 30A facing the metal plates are surely in contact with each other. As a result, a sufficient contact area between the accommodating portion 30A and the press-fitting portion 40A can be ensured.

[0043] Note that the size of the press-fitting portion 40A in the width direction is not particularly limited, but is preferably substantially the same as the diameter of the terminal portion 30C of the electrode terminal 30. Also, the size of the press-fitting portion 40A in the vertical direction is preferably smaller than the size of the accommodating portion 30A of the electrode terminal 30 in the vertical direction.

[0044] An example of the fixing member 50 according to the present embodiment will be described with reference to FIGS. 6 and 7. FIG. 7 is a perspective view showing the fixing member 50.

[0045] The fixing member 50 is a member that fixes the electrode terminal 30 and the bus bar 40. According to the fixing member 50, it is possible to prevent the bus bar 40 from falling off the electrode terminal 30. The fixing member 50 may be formed of an insulating material having elasticity (or flexibility), or may be composed of a metal material. As shown in FIGS. 6 and 7, the fixing member 50 has a fitting portion 50A that is fitted to the side peripheral surface of the terminal portion 30C of the electrode terminal 30, and an insertion portion 50B for inserting into a hole portion 40C formed in the bus bar 40.

[0046] The fitting portion 50A is, for example, a belt-like member curved so as to be formed in a substantially annular shape when viewed from the vertical direction. The substantially annular diameter of the fitting portion 50A when viewed from the vertical direction is preferably smaller than the diameter of the electrode terminal 30. When attaching the fixing member 50 to the electrode terminal 30, it is preferable to fit the fitting portion 50A to the terminal portion 30C from above. The fitting portion 50A preferably contacts substantially the entire circumference of the side peripheral surface of the terminal portion 30C, but may be configured to contact only a part of the side peripheral surface of the terminal portion 30C. In this case, the fitting portion 50A is formed, for example, in a substantially U shape when viewed from the vertical direction. Also, instead of the belt-like fitting portion 50A as shown in FIGS. 6 and 7, it may be a recess formed by cutting out a part of the periphery of a block body. At this time, the fitting portion 50A has no flexibility or elasticity, and the inner dimension of the cavity defined by the fitting portion 50A and the bus bar 40 when the fixing member 50 and the bus bar 40 are connected and fixed may be made smaller than the outer dimension of the electrode terminal to fix firmly. Also, even if the fitting portion 50A is belt-like, it may be fixed by the difference between the inner dimension of the cavity and the outer dimension of the electrode terminal. Further, when using the fixing member 50, a flange portion may be provided at a position above the fitting portion 50A on the outer peripheral surface of the electrode terminal 30, and when viewed from above the power storage device, this flange portion may overlap the fitting portion 50A. With this configuration, the fitting portion 50A is disposed between this flange portion and the base portion 30B of the electrode terminal 30. Therefore, it is possible to suppress the fitting portion 50A from being displaced in the vertical direction by the electrode terminal. And it is possible to suppress the bus bar 40 from being displaced in the vertical direction via the fixing member 50.

[0047] The insertion portion 50B is formed on the outer end surface in the width direction of the fixing member 50. The insertion portion 50B is composed of an upper insertion portion formed on the upper side in the vertical direction and a lower insertion portion formed on the lower side in the vertical direction. The upper insertion portion and the lower insertion portion are formed with a gap therebetween. The upper insertion portion has an upper locking portion 50C formed to protrude upward on the tip side of the upper insertion portion. The lower insertion portion has a lower locking portion 50D formed to protrude downward on the tip side of the lower insertion portion. Note that if the connection strength can be maintained, only one of the upper insertion portion and the lower insertion portion of the insertion portion 50B may be sufficient.

[0048] When attaching the fixing member 50 to the bus bar 40, the insertion portion 50B is inserted into the hole portion 40C of the bus bar 40, and the upper locking portion 50C and the lower locking portion 50D are respectively locked to the opening edge portions on the outer side in the width direction of the hole portion 40C, thereby fixing the fixing member 50 to the bus bar 40. Thereby, the electrode terminal 30 and the bus bar 40 are fixed by the fixing member 50, and particularly when the power storage module 10 vibrates, displacement in the width direction of the bus bar 40 (the direction in which the accommodating portion 30A extends) can be suppressed. And it is possible to prevent the bus bar 40 from falling off from the electrode terminal 30.

[0049] Also, as shown in FIG. 8, when the accommodating portion 30A is constituted by a through hole, connection may be made using a pair of bus bars 40 for one electrode terminal 30. In this case, the press-fitting portions 40A of the respective bus bars 40 may be inserted from the openings at both ends of the accommodating portion 30A. With this configuration, compared with the configuration using one bus bar for one electrode terminal 30, when the total press-fitting depth is the same, the press-fitting depth of one bus bar can be reduced. Therefore, the area of contact between the press-fitting portion 40A of one bus bar 40 and the accommodating portion 30A decreases. Therefore, the frictional resistance at one location of the press-fitting portion 40A decreases, and the working load due to one press-fitting of the bus bar 40 can be reduced. Also, as shown in FIG. 8, the connection portions 40B of the pair of bus bars 40 may be bundled by a restraining member or the like. With this configuration, displacement of the bus bar 40 fixed to the electrode terminal 30 in the width direction can be suppressed.

[0050] According to the power storage module 10, by press-fitting the press-fitting portion 40A of the bus bar 40 into the housing portion 30A of the electrode terminal 30 in the width direction, it is possible to suppress the application of a load in the vertical direction (the direction in which the sealing body 23 is inserted into the outer can 22). Therefore, it is possible to suppress the mechanical stress generated at the joint between the outer can 22 and the sealing body 23.

[0051] Also, according to the power storage module 10, since the press-fitting portion 40A is press-fitted into the housing portion 30A, the metal plate forming the press-fitting portion 40A and the inner surface of the housing portion 30A facing the metal plate are surely in contact. Thereby, a sufficient contact area between the housing portion 30A and the press-fitting portion 40A can be ensured. As a result, the contact resistance between the housing portion 30A and the press-fitting portion 40A can be reduced, and the amount of heat generation when a large current is passed through the bus bar 40 can be reduced.

[0052] Furthermore, according to the power storage module 10, the electrode terminal 30 and the bus bar 40 are joined together by the fixing member 50, and it is possible to avoid the bus bar 40 from falling off from the electrode terminal 30 particularly when the power storage module 10 vibrates.

[0053] Note that the present invention is not limited to the above-described embodiments and their modified examples, and it goes without saying that various changes and improvements are possible within the scope of the matters described in the claims of the present application.

Explanation of Reference Numerals

[0054] 10 Power storage module, 20 Power storage device, 21 Electrode body, 22 Outer can, 22A Opening, 22B Bottom, 23 Sealing body, 24 Insulating holder, 25 Positive electrode lead, 26 Negative electrode lead, 27 Current collecting member, 28 Current collecting member, 30 Electrode terminal, 30A Housing portion, 30B Base portion, 30C Terminal portion, 31 Positive electrode terminal, 32 Negative electrode terminal, 33 Insulating member, 34 Insulating member, 36 Pressure regulating valve, 40 Bus bar, 40A Press-fitting portion, 40B Connection portion, 40C Hole portion, 50 Fixing member, 50A Fitting portion, 50B Insertion portion, 50C Upper locking portion, 50D Lower locking portion

Claims

1. A power storage module comprising a plurality of power storage devices and a bus bar that connects the electrode terminals of each of the power storage devices, wherein the power storage device has an exterior can in which an opening is formed, and a plate-shaped sealing body provided with the electrode terminal and inserted into the opening of the exterior can, the electrode terminal has a receiving portion formed by a through hole or a recess formed along a direction substantially orthogonal to the direction in which the sealing body is inserted into the exterior can, the bus bar has a press-fitting portion press-fitted into the receiving portion, the press-fitting portion is formed by bending a long metal plate, and is formed in a substantially V shape before the press-fitting portion is press-fitted into the receiving portion, and contacts the inner surfaces of the receiving portion facing each other, a power storage module.

2. The power storage module according to claim 1, wherein the receiving portion extends in a direction intersecting the direction in which the plurality of power storage devices are arranged, a power storage module.

3. The power storage module according to claim 1 or 2, further comprising at least one fixing member that fixes the electrode terminal and the bus bar, a power storage module.

4. The power storage module according to claim 3, wherein the fixing member is arranged so as to surround the outer peripheral surface of the electrode terminal, a power storage module.

5. The power storage module according to claim 3 or 4, wherein the fixing member is fixed to the bus bar by inserting an insertion portion formed in the fixing member into a hole portion formed in the bus bar and locking a locking portion formed on the tip side of the insertion portion to the opening edge of the hole portion, a power storage module.

6. The power storage module according to any one of claims 3 to 5, wherein a flange portion is formed on a portion of the outer peripheral surface of the electrode terminal above the fixing member, and the flange portion overlaps the fixing member when the power storage device is viewed from above, a power storage module.

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