Energy storage module

Abstract

To provide a technology that makes it easier to separate a bus bar from a power storage device.SOLUTION: A power storage module 100 includes a plurality of power storage devices 12 and a bus bar 14. The plurality of power storage devices 12 are arranged in a first direction P. The bus bar 14 is bridged between two adjacent power storage devices 12 in the first direction P. The bus bar 14 has a gripped portion 144. The gripped portion 144 is a protrusion protruding from a surface (upper surface 14u) of the bus bar 14 or a through hole.SELECTED DRAWING: Figure 1

Description

Technical Field

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

Background Art

[0002] Japanese Patent Application Laid-Open No. 2018-200832 discloses a battery terminal with a current sensor including a battery terminal made of a conductive metal plate and a current sensor assembled to the battery terminal. The battery terminal includes a post portion connected to a battery post, a load connection terminal portion arranged side by side with the post portion to which a load is connected, and a linear bus bar having the post portion connected to one end side and the load connection terminal portion connected to the other end side. The current sensor includes a magnetic detection portion arranged on the other end side of the bus bar to detect magnetism generated by a current flowing through the bus bar, and a current sensor body integrally holding the magnetic detection portion of the bus bar by resin molding. The bus bar includes a bent portion obtained by bending a side edge portion in the longitudinal direction of the bus bar into an L-shaped cross section. The publication describes that by providing the bus bar with such a bent portion, it is possible to reduce the electrical resistance of the bus bar during continuous energization and improve heat dissipation from the surface of the bus bar.

[0003] International Publication No. 2012 / 118014 discloses a battery system comprising multiple battery cells with positive and negative electrode terminals made of different metals, and the positive and negative electrode terminals of each battery cell are connected by a metal plate. In the battery system, the metal plate joins a first metal plate connected to one electrode terminal of a battery cell and a second metal plate made of a different metal from the first metal plate and connected to the other electrode terminal. The first metal plate has a first laminated portion which is laminated onto the second metal plate. The second metal plate has a second laminated portion which is laminated onto the first metal plate. The first laminated portion has a protrusion, and the second laminated portion has a notch through which the protrusion is inserted, and the protrusion and the notch are tightly bonded to the first metal plate and the second metal plate by a crimping structure. The publication states that this configuration allows for a stable, low-resistance connection between the metal plate and the electrode terminals over a long period of time. [Prior art documents] [Patent Documents]

[0004] [Patent Document 1] Japanese Patent Publication No. 2018-200832 [Patent Document 2] International Publication No. 2012 / 118014 [Overview of the Initiative] [Problems that the invention aims to solve]

[0005] The inventors want to make it easier to separate the busbar from the energy storage module. [Means for solving the problem]

[0006] The technology disclosed herein provides for an energy storage module comprising a plurality of energy storage devices arranged in a first direction, and a busbar spanning two adjacent energy storage devices in the first direction. The busbar has gripping portions, which are projections or through-holes protruding from the surface of the busbar. The busbar can be more easily separated from an energy storage module with such a configuration.

[0007] The technology disclosed herein provides a method for processing an energy storage module comprising a plurality of energy storage devices having electrode terminals arranged in a first direction, and a busbar spanning two adjacent energy storage devices in the first direction. The processing method includes separating the busbar from the energy storage devices by pulling on a gripping portion provided on the busbar, which is a projection or hole protruding from the surface of the busbar. With this configuration, the busbar can be separated from the energy storage devices more easily. [Brief explanation of the drawing]

[0008] [Figure 1] Figure 1 is a perspective view of the energy storage module 100. [Figure 2] Figure 2 is a cross-sectional view of the junction between the busbar 14 and the electrode terminal. [Figure 3] Figure 3 is a schematic cross-sectional view of one step in the processing method. [Figure 4] Figure 4 is a cross-sectional view of the junction between the busbar 214 and the electrode terminal. [Figure 5] Figure 5 is a cross-sectional view of the junction between the busbar 314 and the electrode terminal. [Figure 6] Figure 6 is a cross-sectional view of the junction between the busbar 414 and the electrode terminal. [Figure 7] Figure 7 is a cross-sectional view of the junction between the busbar 514 and the electrode terminal. [Figure 8] Figure 8 is a perspective view of the energy storage module 600. [Figure 9] Figure 9 is a perspective view of the energy storage module 700. [Modes for carrying out the invention]

[0009] The following describes one embodiment of the technology disclosed herein. The embodiment described herein is not intended to limit the technology disclosed herein. Unless otherwise specified, the technology disclosed herein is not limited to the embodiment described herein. The drawings are schematic and do not necessarily reflect the actual objects. In addition, the same reference numerals are used appropriately for members and parts that perform the same function, and redundant explanations are omitted. In the drawings, the numerals "R", "L", "U", "D", "F", and "Rr" indicate "right", "left", "up", "down", "front", and "back", respectively. In addition, the notation "A~B" indicating a numerical range means "A or more and B or less" unless otherwise specified, and also includes the meaning of "greater than A and less than B".

[0010] In this specification, "energy storage device" refers to a device in which charging and discharging occur through the movement of a charge carrier between a pair of electrodes (positive electrode and negative electrode) via an electrolyte. Such energy storage devices include secondary batteries such as lithium-ion secondary batteries, nickel-metal hydride batteries, and nickel-cadmium batteries; and capacitors such as lithium-ion capacitors and electric double-layer capacitors. Below, an embodiment of a lithium-ion secondary battery will be described as an example of the energy storage device described above.

[0011] <First Embodiment> Figure 1 is a perspective view of the energy storage module 100. As shown in Figure 1, the energy storage module 100 comprises a plurality of energy storage devices 12 and a busbar 14. The energy storage devices 12 are arranged in a first direction P. In the configuration shown in Figure 1, the energy storage devices 12 comprise a rectangular parallelepiped case 30, which has a pair of opposing wide faces 30a, a pair of opposing narrow faces 30b, and a bottom face 30c. The wide faces 30a are, here, the largest surfaces in the case 30. The pair of opposing wide faces 30a are, for example, surfaces extending from a pair of opposing long sides of the rectangular bottom face 30c. The narrow faces 30b are, here, the smallest surfaces in the case 30. The pair of opposing narrow faces 30b are, for example, surfaces extending from a pair of opposing short sides of the bottom face 30c. As shown in Figure 1, the energy storage devices 12 are arranged so that their wide faces 30a face each other. The "first direction P" referred to here is the direction from one wide surface 30a to the other wide surface 30a in the energy storage device 12, and is the direction from the rear (Rr) side to the front (F) side in Figure 1 (the same applies to the second to fifth embodiments described later).

[0012] The energy storage device 12 comprises, for example, a case 30, an electrode body (not shown) housed within the case 30, and an electrolyte (not shown). As shown in Figure 1, the case 30 comprises a main body 31 and a sealing plate 32. The main body 31 is, for example, a member that houses the electrode body and the electrolyte. The main body 31 may be a rectangular parallelepiped with one side open. In the configuration shown in Figure 1, the main body 31 has a pair of opposing wide surfaces 30a, a pair of opposing narrow surfaces 30b, and a bottom surface 30c. Here, the bottom surface 30c and the opening are opposite each other. The sealing plate 32 is, for example, a member that closes the opening of the main body 31. The sealing plate has a shape corresponding to the opening of the main body 31, and here it is rectangular (including a substantially rectangular shape; the same applies hereinafter). Note that the electrode body and electrolyte of this type of energy storage device can be used without particular limitation as the electrode body and electrolyte of the energy storage device 12.

[0013] In this embodiment, the energy storage device 12 is provided with a positive electrode terminal 40 and a negative electrode terminal 50 on its outer surface. In the configuration shown in Figure 1, the energy storage device 12 is provided with a positive electrode terminal 40 and a negative electrode terminal 50 on the upper surface 32u of the sealing plate 32. The positive electrode terminal 40 is, for example, a member electrically connected to the positive electrode of the electrode body. The positive electrode terminal 40 has, for example, a portion located inside the case 30 and a portion located outside the case 30. The portion located inside the case 30 is connected to the positive electrode of the electrode body. The portion located outside the case 30 is connected to a busbar 14, which will be described later. The positive electrode terminal 40 may be made of aluminum, for example. The negative electrode terminal 50 may have the same structure as the positive electrode terminal 40. The negative electrode terminal 50 may be made of copper, for example. Note that conventional electrode terminals used in this type of energy storage device can be used as the positive electrode terminal 40 and the negative electrode terminal 50 without any particular limitations.

[0014] Figure 2 is a cross-sectional view of the junction between the busbar 14 and the electrode terminals. Figure 2 shows an enlarged cross-section of the junction between the busbar 14 and the electrode terminals along the first direction P. The busbar 14 is a member that electrically connects, for example, two adjacent energy storage devices 12 in the first direction P (see Figures 1 and 2). As shown in Figure 1, the busbar 14 spans two adjacent energy storage devices 12 in the first direction P. It spans the positive terminal 40 of one energy storage device 12 and the negative terminal 50 of the other energy storage device 12. In the configurations shown in Figures 1 and 2, the busbar 14 has a gripping portion 144.

[0015] The material of the bus bar 14 may be, for example, a metal such as aluminum or an aluminum alloy, copper or a copper alloy, nickel, stainless steel, etc. As the bus bar 14, for example, a bus bar made of aluminum or an aluminum alloy is particularly preferably used. In this embodiment, the bus bar 14 is plate-shaped. In this embodiment, the bus bar 14 may be manufactured by pressing a single metal plate into a desired shape (here, a shape including the gripped portion 144). Alternatively, after pressing a single metal plate into a desired shape (here, a shape excluding the gripped portion 144) for the bus bar 14, the gripped portion 144 may be provided separately.

[0016] As shown in FIG. 2, the bus bar 14 has a main body 14a and an extension portion 14b. In the form shown in FIG. 2, the main body 14a has a first connection portion 141, a second connection portion 142, and a connecting portion 143. The first connection portion 141 is, for example, a portion connected to the positive electrode terminal 40. In the form shown in FIG. 2, a first through hole 141h is provided in the first connection portion 141. A step 141s recessed from the surface of the first connection portion 141 is provided on the inner wall surface of the first through hole 141h. When connecting the first connection portion 141 and the positive electrode terminal 40, for example, the first connection portion 141 and the positive electrode terminal 40 may be overlapped, and the step 141s and the positive electrode terminal 40 may be joined (for example, ultrasonic bonding, laser welding, resistance welding). The second connection portion 142 is, for example, a portion connected to the negative electrode terminal 50. In the form shown in FIG. 2, a second through hole 142h is provided in the second connection portion 142. A step 142s recessed from the surface of the second connection portion 142 is provided on the inner wall surface of the second through hole 142h. When connecting the second connection portion 142 and the negative electrode terminal 50, for example, the second connection portion 142 and the negative electrode terminal 50 may be overlapped, and the step 142s and the negative electrode terminal 50 may be joined (for example, ultrasonic bonding, laser welding, resistance welding). Note that the first through hole 141h, the step 141s, the second through hole 142h, and the step 142s are not necessarily required. These portions may be omitted in other embodiments.

[0017] In this embodiment, the connecting portion 143 is a part that connects the first connecting portion 141 and the second connecting portion 142. As shown in FIG. 2, the connecting portion 143 is disposed between the first connecting portion 141 and the second connecting portion 142. Here, the connecting portion 143 has a pair of opposing standing portions 143a and a flat surface 143b. The pair of opposing standing portions 143a extend from the first connecting portion 141 and the second connecting portion 142 toward the side opposite to the power storage device 12. The flat surface 143b connects between the pair of opposing standing portions 143a. Providing the connecting portion 143 with such a configuration is preferable because, for example, when an external force is applied to the bus bar 14 due to vibration, impact, etc., the external force can be buffered.

[0018] As shown in FIG. 2, the extending portion 14b is a part that extends from the main body 14a in the first direction P. In this embodiment, the extending portion 14b extends from the main body 14a in the first direction P on the positive electrode terminal 40 side and protrudes outside the positive electrode terminal 40.

[0019] In the form shown in FIG. 2, the bus bar 14 has a gripped portion 144 at the tip of the extending portion 14b. Here, the gripped portion 144 is a protrusion protruding from the surface of the bus bar 14. In this embodiment, it protrudes from the upper surface 14u of the bus bar 14 on the side opposite to the power storage device 12. The gripped portion 144 protrudes toward the side opposite to the power storage device 12. The gripped portion 144 may be, for example, a wall portion along the second direction Q provided at the end of the first connecting portion 141 in the first direction P. The "second direction Q" here is a direction orthogonal to the first direction P and along the wide surface 30a as shown in FIG. 1 (the same in the second to fifth embodiments described later). In FIG. 1, the second direction Q is a direction from the left (L) side to the right (R) side.

[0020] The dimensional relationships of the parts of the busbar 14 are not particularly limited, as long as the effects of the technology disclosed herein are realized. For example, for a busbar 14 whose main body 14a has a length L1 of 50 mm to 80 mm (for example, about 65 mm), the height H of the gripped portion 144 is preferably about 2 mm to 10 mm (for example, about 3 mm to 5 mm). In this embodiment, length L1 refers to the length of the busbar 14 in the first direction. The length L2 of the extension portion 14b is preferably about 2 mm to 5 mm. In this embodiment, length L2 refers to the shortest distance between the end of the positive terminal 40 opposite the center of the sealing plate 32 and the gripped portion 144. The thickness of the busbar 14 is preferably about 0.5 mm to 2 mm (for example, about 0.8 mm). The length L3 between the joint between the positive terminal 40 and the busbar 14 and the gripped portion 144 is preferably about 6 mm to 10 mm (for example, about 8 mm). In this embodiment, length L3 refers to the shortest distance between the center of the first through hole 141h and the gripped portion 144.

[0021] As shown in Figure 1, in the energy storage module 100, multiple energy storage devices 12 are constrained in a first direction P. Here, the energy storage module 100 comprises a spacer 11 and a pair of end plates 17. The spacer 11 is positioned between adjacent energy storage devices 12 in the first direction P. The end plates 17 are positioned at both ends of the multiple energy storage devices 12, which are arranged in the first direction P, and constrain the multiple energy storage devices 12. The end plates 17 are bridged by metal restraint bands 18. The ends of the restraint bands 18 are fixed by screws 19.

[0022] The energy storage module 100 can be used for various purposes, but it is particularly suitable for use as a power source (driving power supply) for motors mounted on vehicles such as passenger cars and trucks. The type of vehicle is not particularly limited, but preferred examples include plug-in hybrid vehicles (PHEVs), hybrid electric vehicles (HEVs), and battery electric vehicles (BEVs).

[0023] As described above, the energy storage module 100 comprises a plurality of energy storage devices 12 and a bus bar 14. The plurality of energy storage devices 12 are arranged in a first direction P. The bus bar 14 spans two adjacent energy storage devices 12 in the first direction P. The bus bar 14 has a gripping portion 144. The gripping portion 144 is a projection that protrudes from the surface of the bus bar 14 (the upper surface 14u in Figure 2).

[0024] The busbar 14 has a gripping portion 144, which allows the gripping portion 144 to be grasped and pulled when dismantling the energy storage module 100, for example. This makes it easier to separate the busbar 14 from the energy storage device 12. This improves the recyclability of the energy storage module 100, for example.

[0025] The gripping portion 144 is preferably provided at one end of the busbar 14 in the first direction P. This makes it easier to grip the gripping portion 144 when dismantling the energy storage module 100, thus making it easier to separate the busbar 14 from the energy storage device 12.

[0026] The busbar 14 may have a main body 14a and an extension portion 14b extending from the main body 14a in a first direction P. The busbar 14 may have a gripping portion 144 at the tip of the extension portion 14b. By providing a gripping portion 144 at the tip of the extension portion 14b of the busbar 14, the distance between the joint between the busbar 14 and the terminal (e.g., the positive terminal 40) and the gripping portion 144 can be increased. This makes it easier to grip the gripping portion 144 when disassembling the energy storage module 100, for example, making it easier to separate the busbar 14 from the energy storage device 12.

[0027] Next, a method for processing the energy storage module 100 will be described with reference to Figure 3. Figure 3 is a schematic cross-sectional view of one step in the processing method. Figure 3 schematically shows a cross-sectional view of the process in which the gripping portion 144 of the busbar 14 is gripped by the jig A and separated from the energy storage device 12. The processing method for the energy storage module 100 includes, for example, separating the busbar 14 from the energy storage device 12 by pulling the gripping portion 144 provided on the busbar 14. By implementing this processing method, the busbar 14 can be easily separated from the energy storage device 12, and consequently, the recyclability of the energy storage module 100 can be improved. The processing method disclosed herein may be partially or entirely performed manually by an operator, or partially or entirely performed automatically.

[0028] The processing method is, for example, a method for dismantling the energy storage module 100. The processing method may be, for example, a method for dismantling the energy storage module 100 for the purpose of disposal, or a method for dismantling the energy storage module 100 for the purpose of recycling the energy storage device 12. For this reason, the energy storage module 100 that is the target of the processing method may be, for example, a used energy storage module. A used energy storage module refers to, for example, an energy storage module that is to be disposed of, or an energy storage module that is to be recycled.

[0029] When pulling the gripped portion 144, for example, it is preferable to pull the gripped portion 144, which is gripped by the jig A, in a direction away from the energy storage device 12 (see Figure 1). This makes it easier to separate the busbar 14 from the energy storage device 12. The jig A is not particularly limited as long as it can continue to grip the gripped portion 144 for a predetermined period of time. In the embodiment shown in Figure 3, pliers are used as the jig A. In this embodiment, "the direction away from the energy storage device 12" means the direction upward from the upper surface 32u of the sealing plate 32 (see Figure 1).

[0030] In separating the gripped portion 144, for example, it is preferable to first separate the busbar 14 from the joint between the electrode terminal closer to the gripped portion 144 and the busbar 14. In this embodiment, in separating the gripped portion 144, it is preferable to separate the busbar 14 from the joint between the positive electrode terminal 40 and the busbar 14. As shown in Figure 3, the joint between the positive electrode terminal 40 and the busbar 14 is the joint between the electrode terminal closer to the gripped portion 144 and the busbar 14. Therefore, it becomes easier to separate the busbar 14 from the energy storage device 12.

[0031] While not particularly limited, the processing method may include marking the portion of the busbar 14 where the portion to be gripped 144 is provided, prior to pulling the portion to be gripped 144. This makes it possible, for example, to make the portion to be gripped 144 easier to recognize, or to provide an anti-slip function to the surface of the portion to be gripped 144 to achieve a more stable grip. As a result, the portion to be gripped 144 is gripped more efficiently, and the separation of the busbar 14 from the energy storage device 12 becomes easier. In this embodiment, "the portion where the portion to be gripped 144 is provided" refers to the portion to be gripped 144 itself, the periphery of the portion to be gripped 144, or the portion to be gripped 144 itself and the periphery of the portion to be gripped 144. "Marking the area where the gripping portion 144 is provided" means, for example, processing the area where the gripping portion 144 is provided so that the surface properties or material of the area where the gripping portion 144 is provided on the bus bar 14 differ from the properties or material of the other areas excluding the area where the gripping portion 144 is provided.

[0032] The marking method is not particularly limited, and may be, for example, a process that creates recesses and / or protrusions on the surface of the part where the gripping portion 144 is provided (e.g., knurling). Marking may also be done, for example, by applying tape to the surface of the part where the gripping portion 144 is provided. The tape may be, for example, colored, or capable of providing an anti-slip function to the area to which it is applied.

[0033] The timing for marking the area where the gripping portion 144 is provided may be, for example, during the manufacturing process of the energy storage module 100. In this case, for example, a busbar 14 that has been pre-marked with the area where the gripping portion 144 is provided may be used. The area where the gripping portion 144 is provided may be marked after the busbar 14 has been attached to the energy storage device 12. Alternatively, the area where the gripping portion 144 is provided may be marked when processing the energy storage module 100.

[0034] As described above, a first embodiment of the technology disclosed herein has been described. However, the technology disclosed herein may include modifications and changes to the embodiments illustrated above. The same effects as the first embodiment will be achieved in the other embodiments illustrated below. In the following description, parts common to the first embodiment will not be described again.

[0035] <Second Embodiment> For example, in the first embodiment, the gripping portion 144 was a projection. However, the shape of the gripping portion is not limited to this. Figure 4 is a cross-sectional view of the joint between the busbar 214 and the electrode terminal. In the configuration shown in Figure 4, the busbar 214 has a gripping portion 2144 which is a through hole. The busbar 214 may be the same as the busbar 14 except that the gripping portion 2144 is a through hole. Since the gripping portion 2144 is a through hole, a hook-shaped jig may be used as a jig in the processing method. The gripping portion 2144 can be gripped by hooking the hook portion of such a jig onto the gripping portion 2144.

[0036] <Third Embodiment> For example, in the first embodiment, the busbar 14 had a body 14a and an extension 14b, with a gripping portion 144 at the tip of the extension 14b. However, the technology disclosed herein is not limited thereto. Figure 5 is a cross-sectional view of the joint between the busbar 314 and the electrode terminal. As shown in Figure 5, the busbar 314 has a first connecting portion 3141, a second connecting portion 3142, and a connecting portion 3143. In this embodiment, the busbar 314 has a first connecting portion 3141 at one end in the first direction P. The first connecting portion 3141 is superimposed on the positive electrode terminal 40. The busbar 314 has a second connecting portion 3142 at the other end in the first direction P. The second connecting portion 3142 is superimposed on the negative electrode terminal 50. In this embodiment, the busbar 314 has a gripping portion 3144 on the first connecting portion 3141. The gripping portion 3144 is provided at the end of the first connecting portion 3141 in the first direction P. Here, the end of the first connecting portion 3141 in the first direction P is the end opposite to the second connecting portion 3142. In this case, the gripping portion 3144 is a projection protruding from the surface. However, the shape of the gripping portion 3144 is not limited to this and may be a through hole. Regarding the bus bar 314, it may be the same as the bus bar 14 except for what is described here. In Figure 5, reference numerals 3141s and 3142s indicate steps, reference numeral 3141h indicates the first through hole, and reference numeral 3142h indicates the second through hole.

[0037] <Fourth Embodiment> In the embodiments described above, a busbar made of a single metal material was used. However, the busbar used in the technology disclosed herein is not limited to this. Figure 6 is a cross-sectional view of the joint between the busbar 414 and the electrode terminals. As shown in Figure 6, the busbar 414 may have a first metal member 4141 and a second metal member 4142. The first metal member 4141 and the second metal member 4142 may be made of different metals and be joined to each other. The busbar 414 may be, for example, a so-called clad material. The first metal member 4141 may be joined to the positive electrode terminal 40. The second metal member may be joined to the negative electrode terminal 50.

[0038] The first metal member 4141 is preferably made of the same metal as the positive terminal 40, for example, aluminum or an aluminum alloy. As shown in Figure 6, the first metal member 4141 has a first connecting portion 4141a, a first erecting portion 4141b, and a first connecting portion 4141c. The first connecting portion 4141a is, for example, plate-shaped and is the portion connected to the positive terminal 40. In this embodiment, the first connecting portion 4141a is positioned along the upper surface of the positive terminal 40 and joined to the positive terminal 40. The first connecting portion 4141a is joined to the positive terminal 40 by a step 4141s provided on the inner wall surface of the first through hole 4141h, for example. The first erecting portion 4141b is, for example, the portion erected from the end of the first connecting portion 4141a on the second metal member 4142 side in the first direction P. The first erected portion 4141b connects the first connecting portion 4141a and the first connecting portion 4141c. The first connecting portion 4141c is, for example, plate-shaped and is the portion that connects to the second metal member 4142. In this embodiment, the first connecting portion 4141c is connected to the second metal member 4142 by joining it to the second connecting portion 4142c (for example, by diffusion bonding, ultrasonic bonding, laser welding, or resistance welding). The joining of the first connecting portion 4141a and the positive electrode terminal 40 can be achieved by, for example, ultrasonic bonding, laser welding, or resistance welding.

[0039] The second metal member 4142 is preferably the negative electrode terminal 50, and is made of copper or a copper alloy, for example. As shown in Figure 6, the second metal member 4142 has a second connecting portion 4142a, a second upright portion 4142b, and a second connecting portion 4142c. The second connecting portion 4142a is, for example, plate-shaped and is the portion connected to the negative electrode terminal 50. In this embodiment, the second connecting portion 4142a is positioned along the upper surface of the negative electrode terminal 50 and is joined to the negative electrode terminal 50. The second connecting portion 4142a is joined to the negative electrode terminal 50 by a step 4142s provided on the inner wall surface of the second through hole 4142h, for example. The joining of the second connecting portion 4142a and the negative electrode terminal 50 can be achieved by, for example, ultrasonic welding, laser welding, resistance welding, etc. The second erected portion 4142b is, for example, a portion erected from the end of the second connecting portion 4142a on the first metal member 4141 side in the first direction P. In this embodiment, the second erected portion 4142b connects the second connecting portion 4142a and the second connecting portion 4142c. The second connecting portion 4142c is, for example, plate-shaped and is a portion that connects to the first metal member 4141. In this embodiment, the second connecting portion 4142c is connected to the first metal member 4141 by being joined to the first connecting portion 4141c.

[0040] As shown in Figure 6, the busbar 414 has a gripping portion 4144. In this embodiment, the bonding strength between the electrode terminal closer to the gripping portion 4144 and the busbar 414 is less than the bonding strength between the electrode terminal further away from the gripping portion 4144 and the busbar. In the configuration shown in Figure 6, the electrode terminal closer to the gripping portion 4144 is the positive electrode terminal 40. As described above, the positive electrode terminal 40 is bonded to the first connecting portion 4141a of the first metal member 4141. The bonding between the positive electrode terminal 40 and the first connecting portion 4141a is, in this case, a bonding between aluminum or aluminum alloy members. The electrode terminal further away from the gripping portion 4144 is the negative electrode terminal 50. As described above, the negative electrode terminal 50 is bonded to the second connecting portion 4142a of the second metal member 4142. The connection between the negative electrode terminal 50 and the second connection part 4142a is, in this case, a connection between copper or copper alloy components. The bonding strength between aluminum or aluminum alloy components is lower than that between copper or copper alloy components. By providing the gripping portion 4144 closer to the connection between the electrode terminal and the busbar 414, where the bonding strength is relatively low, the busbar 414 can be separated from the energy storage device 12 more easily.

[0041] As shown in Figure 6, the gripping portion 4144 is preferably provided on the first metal member 4141. In this embodiment, the gripping portion 4144 is provided on the end of the first connecting portion 4141a opposite to the first upright portion 4141b in the first direction P. By providing the gripping portion 4144 at this location, the busbar 414 can be more easily separated from the positive terminal 40, and consequently, the busbar 414 can be more easily separated from the energy storage device 12. Aluminum or aluminum alloys are softer and easier to process than copper or copper alloys. Therefore, providing the gripping portion 4144 on the first metal member 4141 makes it easier to manufacture the busbar 414 than providing the gripping portion on the second connecting portion 4142a.

[0042] <Fifth Embodiment> In the fourth embodiment, the gripping portion 4144 was provided at one end of the busbar 414 in the first direction P. However, the gripping portion does not necessarily have to be provided at this location. Figure 7 is a cross-sectional view of the joint between the busbar 514 and the electrode terminal. As shown in Figure 7, the busbar 514 includes a gripping portion 5144. In this embodiment, the gripping portion 5144 is provided at the joint between the first metal member 5141 and the second metal member 5142. In the configuration shown in Figure 7, the joint between the first metal member 5141 and the second metal member 5142 is provided at the joint between the first connecting portion 5141c and the second connecting portion 5142c. Here, the gripping portion 5144 is provided at the joint between the first connecting portion 5141c and the second connecting portion 5142c, at the end of the first connecting portion 5141c on the side of the second connecting portion 5142a in the first direction P.

[0043] The first metal member 5141 and the second metal member 5142 are made of different metals, and the joint between them is a joint between dissimilar metals. The joint between the first metal member 5141 and the second metal member 5142 may have a lower joint strength than the joint between the first metal member 5141 and the positive terminal 40, or the joint between the second metal member 5142 and the negative terminal 50. In other words, the joint between the first metal member 5141 and the second metal member 5142 may have the lowest joint strength among the joints in the busbar 514 and the electrode terminals. Therefore, the busbar 514 can be separated from the electrode terminals more easily.

[0044] In the processing methods of the fourth and fifth embodiments, the energy storage device 12 is an energy storage module 100 that includes busbars 414, 514 comprising first metal members 4141, 5141 and second metal members 4142, 5142. The first metal members 4141, 5141 and the second metal members 4142, 5142 are composed of different metals and are joined to each other. The energy storage module 100 in the fourth and fifth embodiments is suitable as a processing target for the processing method from the viewpoint of the ease of separation of the busbars 414, 514 described above. In Figure 7, reference numeral 5141a denotes the first connection part, reference numeral 5141b denotes the first upright part, reference numeral 5142b denotes the second upright part, reference numerals 5141s and 5142s denotes steps, reference numeral 5141h denotes the first through hole, and reference numeral 5142h denotes the second through hole.

[0045] <Sixth Embodiment> The "first direction P" in the technology disclosed herein does not necessarily have to be the direction defined in the embodiments described above. Figure 8 is a perspective view of the energy storage module 600. Figure 8 schematically shows the overall structure of the energy storage module 600. As shown in Figure 8, the energy storage module 600 comprises a plurality of energy storage devices 12 and a bus bar 614. The energy storage devices 12 are arranged in the first direction P. The bus bar 614 spans two adjacent energy storage devices 12 in the first direction P. Here, the energy storage devices 12 are arranged so that the narrow faces 30b of adjacent energy storage devices 12 face each other. In this embodiment, the "first direction P" is the direction from one narrow face 30b to the other narrow face 30b of the energy storage device 12, and in Figure 8, it is the direction from the left (L) side to the right (R) side (the same applies to the seventh embodiment described later). Note that while Figure 8 shows four energy storage devices 12, this is merely an example and is not intended to limit the number of energy storage devices 12 included in the energy storage module 600. In Figure 8, one wide surface 30a is positioned on the upper (U) side and the other wide surface 30a is positioned on the lower (D) side, while one narrow surface 30b is positioned on the left (L) side and the other narrow surface 30b is positioned on the right (R) side. However, this is merely an example and is not intended to limit the installation configuration of the energy storage module 600 (the same applies to the seventh embodiment described later).

[0046] In the configuration shown in Figure 8, the busbar 614 spans between the positive terminal 40 of one energy storage device 12 and the negative terminal 50 of the other energy storage device 12 in a first direction P. Any of the busbars 14, 214, 314, 414, and 514 from the first to fifth embodiments may be used as the busbar 614.

[0047] <Seventh Embodiment> Figure 9 is a perspective view of the energy storage module 700. Figure 9 schematically shows the overall structure of the energy storage module 700. As shown in Figure 9, the energy storage module 700 comprises a group of energy storage devices 701. The group of energy storage devices 701 comprises a group of energy storage devices 12 and a first busbar 714a. The group of energy storage devices 12 are arranged in a first direction P. The first busbar 714a spans two adjacent energy storage devices 12 in the first direction P. Here, the energy storage devices 12 are arranged so that the narrow faces 30b of adjacent energy storage devices 12 face each other. In the configuration shown in Figure 9, the busbar 714 spans the positive terminal 40 of one energy storage device 12 and the negative terminal 50 of the other energy storage device 12 in two adjacent energy storage devices 12 in the first direction P. As the first busbar 714a, any of the busbars 14, 214, 314, 414, and 514 of the first to fifth embodiments may be used.

[0048] As shown in Figure 9, the multiple energy storage device groups 701 are arranged (overlapping) in the second direction Q and electrically connected to each other. In this embodiment, the multiple energy storage device groups 701 are arranged (overlapping) such that the wide surfaces 30a of two adjacent energy storage devices 12 overlap each other in the second direction Q. In this embodiment, the "second direction Q" is the direction from one wide surface 30a of the energy storage device 12 to the other wide surface 30a, and in Figure 9, it is the direction from the bottom (D) side to the top (U) side. In this embodiment, the multiple energy storage device groups 701 are electrically connected to each other by a second busbar 714b. As shown in Figure 9, the second busbar 714b spans between the positive terminal 40 of one adjacent energy storage device 12 and the negative terminal 50 of the other energy storage device 12 at one or the other end in the first direction P. As the second busbar 714b, a conventionally known busbar used in this type of energy storage module may be used, but it is preferable to use any of the busbars 14, 214, 314, 414, and 514 of the first to fifth embodiments. In Figure 9, three energy storage device groups 701 are shown, but this is merely an example and is not intended to limit the number of energy storage device groups 701. In Figure 9, the energy storage device group 701 includes four energy storage devices 12, but this is merely an example and is not intended to limit the number of energy storage devices 12 included in the energy storage device group 701.

[0049] As described above, specific embodiments of the technology disclosed herein include those described in the following sections. Section 1: Multiple energy storage devices arranged in the first direction, A busbar spanning two adjacent energy storage devices in the first direction, A battery storage module equipped with, The busbar has a gripping portion which is a projection or through hole protruding from the surface of the busbar, and the energy storage module is provided. Section 2: The energy storage module according to item 1, wherein the gripping portion is provided at one end of the busbar in the first direction. Section 3: The aforementioned busbar is It has a main body and an extension portion extending from the main body in the first direction, The energy storage module according to claim 1 or 2, wherein the gripping portion is located at the tip of the extension portion. Section 4: The energy storage device is provided with a positive terminal and a negative terminal on its outer surface. The aforementioned busbar is It is connected between the positive terminal of one of the two adjacent energy storage devices and the negative terminal of the other energy storage device. It comprises a first metal member and a second metal member, which are made of different metals and joined together. The energy storage module according to any one of items 1 to 3, wherein the first metal member is joined to the positive terminal and the second metal member is joined to the negative terminal. Section 5: The energy storage module according to any one of items 1 to 4, wherein the bonding strength between the electrode terminal closer to the gripped portion and the busbar is less than the bonding strength between the electrode terminal further from the gripped portion and the busbar. Item 6: The energy storage module according to any one of items 1 to 5, wherein the gripping portion is provided at the joint between the first metal member and the second metal member. Section 7: The gripped portion is provided on the first metal member, and is an energy storage module according to any one of items 4 to 6. Section 8: Multiple energy storage devices, each having electrode terminals, are arranged in a first direction. A busbar spanning two adjacent energy storage devices in the first direction, A method for processing an energy storage module, A processing method comprising separating the busbar from the energy storage device by pulling on a gripping portion, which is a projection or hole protruding from the surface of the busbar, provided on the busbar. Section 9: The processing method according to item 8, wherein, in the pulling, the gripped portion held by the jig is pulled in a direction away from the energy storage device. Section 10: The processing method according to item 8 or 9, wherein, in the separation, the busbar is first separated from the joint between the electrode terminal and the busbar that is closer to the gripped portion. Section 11: The processing method according to any one of claims 8 to 10, comprising marking the portion on the busbar where the portion to be gripped is provided, prior to pulling the portion to be gripped. Section 12: The processing method according to any one of claims 8 to 11, for processing an energy storage module which includes a busbar comprising a first metal member and a second metal member made of different metals and joined to each other.

[0050] While embodiments of the technology disclosed herein have been described above, the technology disclosed herein is not intended to be limited to the embodiments described herein. The technology disclosed herein can also be implemented in other embodiments. The technology described in the claims includes various modifications and changes to the embodiments exemplified above. For example, it is possible to replace parts of the above embodiments with other modifications, and it is also possible to add other modifications to the above embodiments. Furthermore, if a technical feature is not described as essential, it may be deleted as appropriate. [Explanation of symbols]

[0051] 12 Energy Storage Devices 14 Bus Bar 14a Main Unit 14b Extension part 141 First connection section 142 Second connection section 143 Connecting part 144 Grasped part 30 cases 40 Positive terminal 50 Negative terminal 100, 600, 700 energy storage modules A Jig 214,314,414,514,614 Busbar 714a First bus bar 714b Second bus bar 2144,3144,4144,5144 Grasped part

Claims

1. Multiple energy storage devices arranged in the first direction, A busbar spanning two adjacent energy storage devices in the first direction, A battery storage module equipped with, The busbar has a gripping portion which is a projection that protrudes from the surface of the busbar, The energy storage device is provided with a positive terminal and a negative terminal on its outer surface. The aforementioned busbar is It is connected between the positive terminal of one of the two adjacent energy storage devices and the negative terminal of the other energy storage device. It comprises a first metal member and a second metal member, which are made of different metals and joined together. The first metal member is joined to the positive terminal, and the second metal member is joined to the negative terminal. The bonding strength between the electrode terminal closer to the gripped portion and the busbar is less than the bonding strength between the electrode terminal further away from the gripped portion and the busbar. Energy storage module.

2. Multiple energy storage devices arranged in the first direction, A busbar spanning two adjacent energy storage devices in the first direction, A battery storage module equipped with, The busbar has a gripping portion which is a projection that protrudes from the surface of the busbar, The energy storage device is provided with a positive terminal and a negative terminal on its outer surface. The aforementioned busbar is It is connected between the positive terminal of one of the two adjacent energy storage devices and the negative terminal of the other energy storage device. It includes a first connection part connected to the positive terminal, a second connection part connected to the negative terminal, and a connecting part that connects the first connection part and the second connection part. The aforementioned connecting portion is It is positioned between the first connection part and the second connection part, It has a pair of opposing upright portions extending from the first connection portion and the second connection portion toward the opposite side of the energy storage device, and a flat surface connecting the pair of opposing upright portions, The gripped portion protrudes from the flat surface toward the side opposite to the energy storage device, The busbar comprises a first metal member and a second metal member, which are made of different metals and joined together. The first metal member is joined to the positive terminal, and the second metal member is joined to the negative terminal. The gripping portion is provided at the joint between the first metal member and the second metal member. Energy storage module.

3. A plurality of energy storage devices arranged in a first direction, A busbar spanning two adjacent energy storage devices in the first direction, A battery storage module equipped with, The busbar has a gripping portion which is a projection that protrudes from the surface of the busbar, The energy storage device is provided with a positive terminal and a negative terminal on its outer surface. The aforementioned busbar is It is connected between the positive terminal of one of the two adjacent energy storage devices and the negative terminal of the other energy storage device. It includes a first connection part connected to the positive terminal, a second connection part connected to the negative terminal, and a connecting part that connects the first connection part and the second connection part. The aforementioned connecting portion is It is positioned between the first connection part and the second connection part, It has a pair of opposing upright portions extending from the first connection portion and the second connection portion toward the opposite side of the energy storage device, and a flat surface connecting the pair of opposing upright portions, The gripped portion is, One end of the busbar in the first direction, or The flat surface It protrudes from the opposite side of the energy storage device, The busbar comprises a first metal member and a second metal member, which are made of different metals and joined together. The first metal member is joined to the positive terminal, and the second metal member is joined to the negative terminal. The gripping portion is provided on the first metal member, Energy storage module.

4. The gripping portion is provided at one end of the busbar in the first direction. The energy storage module according to claim 1.

5. The aforementioned busbar is It has a main body and an extension portion extending from the main body in the first direction, The tip of the extended portion has the portion to be gripped, The energy storage module according to claim 1.

6. The energy storage module according to claim 1, wherein the gripping portion is provided at the joint between the first metal member and the second metal member.

7. The energy storage module according to claim 1, wherein the gripping portion is provided on the first metal member.

8. Multiple energy storage devices, each having electrode terminals, are arranged in a first direction. A busbar spanning two adjacent energy storage devices in the first direction, A method for processing an energy storage module, This includes separating the busbar from the energy storage device by pulling on a gripping portion, which is a projection or hole protruding from the surface of the busbar, provided on the busbar. In the separation described above, first, the busbar is separated from the joint between the electrode terminal and the busbar that is closer to the gripped portion. Processing method.

9. The processing method according to claim 8, wherein, in the pulling, the gripped portion held by the jig is pulled in a direction away from the energy storage device.

10. The processing method according to claim 8, further comprising marking the portion on the busbar where the portion to be gripped is provided, prior to pulling the portion to be gripped.

11. The processing method according to any one of claims 8 to 10, for processing an energy storage module which includes a busbar comprising a first metal member and a second metal member that are made of different metals and joined to each other.

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