Energy storage module

Abstract

An electric power storage module 100 comprises an electric power storage device 1 and a holder 104 holding the electric power storage device 1. The electric power storage device 1 comprises: a plurality of cylindrical electrodes; a plurality of containers 12 individually containing the plurality of electrodes; and a film exterior 4 having a sealing part 14 sealing each container 12 and interconnecting the plurality of containers 12. The holder 104 is adhered to the sealing part 14.

Description

Technical Field

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

Background Art

[0002] Conventionally, a power storage module in which a plurality of cylindrical power storage devices (for example, batteries) are mounted is known (see, for example, Patent Document 1). In the power storage module disclosed in Patent Document 1, each power storage device has a cylindrical outer can, and a wound electrode body is housed in each outer can.

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] The power storage module may be used as a power source for in-vehicle or portable terminal applications. Therefore, weight reduction of the power storage module is desired. As a method for reducing the weight of the power storage module, it is conceivable to wrap a plurality of electrode bodies with a common film exterior while maintaining the individual sealing properties. Thereby, a power storage device having a plurality of electrode bodies can be obtained. In this case, since the outer cans for housing each electrode body can be eliminated, the weight of the power storage module can be reduced.

[0005] For such a power storage module including a plurality of electrode bodies, not only weight reduction but also improvement in safety is required. The inventors of the present invention have conducted intensive studies and conceived a technique for enhancing the safety of the power storage module.

[0006] The present disclosure has been made in view of such circumstances, and one of its objects is to provide a technique for enhancing the safety of a power storage module.

Means for Solving the Problems

[0007] One aspect of the present disclosure is an energy storage module. The energy storage module comprises an energy storage device and a holder for holding the energy storage device, the energy storage device having a plurality of cylindrical electrode bodies, a plurality of housings that enclose the plurality of electrode bodies individually, and a film outer casing that seals each housing and connects the plurality of housings to each other, the holder being bonded to the sealings.

[0008] Another aspect of the present disclosure is an energy storage module. This energy storage module comprises an energy storage device, a holder for holding the energy storage device, and a filler interposed between the energy storage device and the holder, wherein the thermal conductivity at a first temperature is lower than the thermal conductivity at a second temperature lower than the first temperature.

[0009] Any combination of the above components, as well as any conversion of the expressions of this disclosure between methods, apparatus, systems, etc., are also valid forms of this disclosure. [Effects of the Invention]

[0010] According to this disclosure, the safety of energy storage modules can be enhanced. [Brief explanation of the drawing]

[0011] [Figure 1] This is a perspective view of an energy storage device. [Figure 2] Figure 2(A) is a schematic diagram of the energy storage device viewed from the axial direction. Figure 2(B) is a schematic diagram of the energy storage device viewed from a second direction. [Figure 3] Figures 3(A) to 3(E) are process diagrams showing the manufacturing method of an energy storage device. [Figure 4] This is a perspective view of an energy storage module according to an embodiment. [Figure 5] This is a disassembled perspective view of the energy storage module. [Figure 6] This is a perspective view of the energy storage devices and holders arranged in the second direction. [Figure 7] Figures 7(A) and 7(B) are cross-sectional views of a portion of an energy storage module along a plane perpendicular to the axial direction. [Figure 8] Figure 8(A) is a magnified view of a portion of the filler. Figure 8(B) is a magnified view of the dashed area in Figure 7(A). [Figure 9] Figure 9(A) is a perspective view of a portion of the holder. Figure 9(B) is a plan view of a portion of the holder. [Figure 10] Figure 10(A) is a perspective view of the energy storage module. Figure 10(B) is a cross-sectional view of a portion of the energy storage module along a plane perpendicular to the second direction. [Figure 11] This is a perspective view of a portion of an energy storage module. [Figure 12] Figures 12(A) and 12(B) are perspective views of a portion of the energy storage module. [Figure 13] This is a cross-sectional view of a portion of the energy storage module along a plane perpendicular to the first direction. [Modes for carrying out the invention]

[0012] The present disclosure will be described below with reference to the drawings, based on preferred embodiments. The embodiments are illustrative and not limiting, and not all features or combinations thereof described in the embodiments are necessarily essential to the present disclosure. The same or equivalent components, members, and processes shown in each drawing are denoted by the same reference numerals, and redundant descriptions are omitted where appropriate. The scale and shape of each part shown in each drawing are set for convenience to facilitate explanation and are not to be interpreted restrictively unless otherwise specified. Furthermore, where terms such as "first," "second," etc. are used in this specification or claims, unless otherwise specified, these terms do not indicate any order or importance, but are used to distinguish one configuration from another. In addition, some components that are not important for explaining the embodiments are omitted in each drawing.

[0013] [Energy storage device] First, the power storage device included in the power storage module according to this embodiment will be described. FIG. 1 is a perspective view of the power storage device 1. FIG. 2(A) is a schematic view of the power storage device 1 seen from the axial direction A. FIG. 2(B) is a schematic view of the power storage device 1 seen from the second direction C. In FIG. 2(B), for convenience of explanation, the inside of the film exterior body 4 is also shown. In this embodiment, the direction in which the axis of the spiral of the electrode body 2 (the central axis of the cylinder) extends is defined as the axial direction A, the direction in which the plurality of electrode bodies 2 are arranged is defined as the first direction B, and the direction intersecting the axial direction A and the first direction B is defined as the second direction C. As an example, the axial direction A, the first direction B, and the second direction C are orthogonal to each other.

[0014] The power storage device 1 of this embodiment is, for example, a rechargeable secondary battery such as a lithium-ion battery, a nickel-metal hydride battery, or a nickel-cadmium battery, or a capacitor such as an electric double layer capacitor. The power storage device 1 has a plurality of electrode bodies 2 and a film exterior body 4. The power storage device 1 of this embodiment includes eight electrode bodies 2, but the number is not particularly limited and may be one or more.

[0015] Each electrode body 2 is cylindrical, and has a wound structure in which a strip-shaped first electrode plate and a strip-shaped second electrode plate are laminated with an electrode separator sandwiched therebetween and wound in a spiral shape. As an example, the first electrode plate is a negative electrode plate and the second electrode plate is a positive electrode plate. The power storage device 1 has a plurality of electrode leads electrically connected to each electrode body 2. Specifically, a first electrode lead 8 is electrically connected to the first electrode plate. Also, a second electrode lead 10 is electrically connected to the second electrode plate. For example, the first electrode lead 8 and the second electrode lead 10 are strip-shaped (rectangular in shape long in one direction), and one end of each is welded to each electrode plate. The plurality of electrode bodies 2 are arranged in the first direction B at a predetermined interval with their postures determined such that the axial direction A of each electrode body 2 is parallel to each other. The plurality of electrode bodies 2 are wrapped by a common film exterior body 4.

[0016] The film exterior body 4 has a structure in which, for example, two laminated films are laminated. Each laminated film has a structure in which a thermoplastic resin sheet is laminated on both sides of a metal sheet such as aluminum. Further, the film exterior body 4 has a plurality of accommodating portions 12 and a sealing portion 14. The plurality of accommodating portions 12 are arranged in the first direction B at a predetermined interval. Each accommodating portion 12 is cylindrical and individually wraps and accommodates each electrode body 2. Each accommodating portion 12 is constituted by a bag portion provided in the film exterior body 4. The bag portion is a portion where the two laminated films are separated from each other. Therefore, each accommodating portion 12 protrudes in the thickness direction (second direction C) of the film exterior body 4 from the sealing portion 14 along the shape of the side surface of the electrode body 2. An electrolytic solution 16 is accommodated in each accommodating portion 12 together with the electrode body 2.

[0017] The sealing portion 14 surrounds the outer periphery of each accommodating portion 12 and seals each accommodating portion 12. The sealing portion 14 is constituted by, for example, a welded portion of a thermoplastic resin sheet. The welded portion is obtained by subjecting the outer periphery of the bag portion of the film exterior body 4 to a thermocompression bonding treatment, and welding the thermoplastic resin sheets of the two laminated films to each other. The sealing portion 14 seals each accommodating portion 12 and connects the plurality of accommodating portions 12 to each other. The sealing portion 14 has a pair of first portions 14a that are arranged sandwiching each accommodating portion 12 in the axial direction A and extend in the first direction B, and a plurality of second portions 14b that are arranged alternately with the plurality of accommodating portions 12 in the first direction B and extend in the axial direction A. The end portion of each second portion 14b in the axial direction A is connected to each first portion 14a. Each accommodating portion 12 is sealed at its end portion in the axial direction A by a pair of first portions 14a, and sealed at its end portion in the first direction B by a pair of second portions 14b. Note that the sealing portion 14 may be one or more according to the number of accommodating portions 12.

[0018] The end portions of the first electrode lead 8 and the second electrode lead 10 on the side opposite to the side connected to the electrode body 2 protrude to the outside from the sealing portion 14. The interface between each electrode lead and the film exterior body 4 is sealed with a known sealant. In the present embodiment, the first electrode lead 8 and the second electrode lead 10 connected to each electrode body 2 protrude to opposite sides in the axial direction A. Further, each first electrode lead 8 protrudes to the same side.

[0019] The following shows an example of a method for manufacturing the energy storage device 1. Figures 3(A) to 3(E) are process diagrams of the method for manufacturing the energy storage device 1. First, as shown in Figure 3(A), a first laminate film 20a is prepared. Multiple semi-cylindrical recesses 18 are pre-formed in the first laminate film 20a. The multiple recesses 18 are formed, for example, by applying a known process such as press working to the first laminate film 20a. An electrode body 2 is placed in each recess 18. A first electrode lead 8 and a second electrode lead 10 are pre-connected to the electrode body 2. The first electrode lead 8 and the second electrode lead 10 are provided with sealant (not shown).

[0020] Next, as shown in Figure 3(B), the second laminate film 20b is superimposed on the first laminate film 20a to form the film outer casing 4. The second laminate film 20b is provided with semi-cylindrical recesses 18 at positions opposite to each recess 18 of the first laminate film 20a. Therefore, when the first laminate film 20a and the second laminate film 20b are superimposed, the pair of recesses 18 form the housing portion 12. The method for forming the recesses 18 in the second laminate film 20b is the same as the method for forming the recesses 18 in the first laminate film 20a. With the electrode body 2 housed in the housing portion 12, the tips of the first electrode lead 8 and the second electrode lead 10 protrude outside the film outer casing 4.

[0021] Next, as shown in Figure 3(C), a portion of the film outer casing 4 is subjected to a heat-sealing process to form a welded portion 22. The portion of the film outer casing 4 that is not subjected to the heat-sealing process becomes a non-welded portion 24. The non-welded portions 24 are arranged to connect each housing portion 12 to the outside of the film outer casing 4. In this embodiment, the non-welded portions 24 are provided so as to connect the side of each housing portion 12 from which the first electrode lead 8 protrudes to the outside of the film outer casing 4. The remaining three sides of each housing portion 12 are surrounded by the welded portions 22. The interface between the film outer casing 4 and the second electrode lead 10 is sealed with sealant.

[0022] Next, as shown in Figure 3(D), electrolyte 16 is injected into each housing portion 12 via the non-welded portion 24. After the injection of electrolyte 16, as shown in Figure 3(E), the non-welded portion 24 is also subjected to a heat-compression sealing treatment. As a result, a sealing portion 14 is formed that surrounds the entire circumference of each housing portion 12. The interface between the film outer casing 4 and the first electrode lead 8 is sealed with sealant. Through these steps, the energy storage device 1 is obtained.

[0023] The manufacturing method of the energy storage device 1 is not limited to those described above. For example, one laminate film twice the length of the energy storage device 1 may be used, and this laminate film may be folded in half to wrap each electrode body 2. Also, if the required amount of electrolyte 16 is small, the electrolyte 16 injection step shown in Figure 3(D) can be omitted by pre-soaking the inter-electrode separator with the electrolyte 16. In this case, in the thermocompression bonding step shown in Figure 3(C), thermocompression bonding is applied to the entire circumference of each housing part 12 to form a sealed part 14.

[0024] [Energy storage module] The energy storage device 1 is incorporated into the energy storage module 100 according to this embodiment. Figure 4 is a perspective view of the energy storage module 100 according to this embodiment. Figure 5 is an exploded perspective view of the energy storage module 100. Note that the reinforcing plate 128 is not shown in Figures 4 and 5. The energy storage module 100 comprises an energy storage device 1 and a holder 104. The energy storage module 100 of this embodiment comprises a plurality of energy storage devices 1 and a plurality of holders 104. Note that the illustrated energy storage module 100 comprises eight energy storage devices 1, but the number is not particularly limited.

[0025] Multiple energy storage devices 1 are positioned so that their housing sections 12 are aligned in the first direction B, and then arranged in the second direction C. Two adjacent energy storage devices 1 in the second direction C are positioned offset from each other in the first direction B such that the axis of the electrode body 2 of the other energy storage device 1 is located between the axes of two adjacent electrode bodies 2 of the other energy storage device 1. In other words, the housing section 12 of the other energy storage device 1 fits into the gap between the two housing sections 12 of the other energy storage device 1. This makes it possible to reduce the dimensions of the energy storage module 100 in the second direction C.

[0026] Multiple holders 104 are arranged alternately with multiple energy storage devices 1 in the second direction C. The holders 104 extend in the first direction B (i.e., are longer in the first direction B). By assembling the energy storage devices 1 and the holders 104 in the second direction C, the energy storage devices 1 are held by the holders 104. This increases the rigidity of the energy storage devices 1. As an example, the holders 104 are made of metal such as aluminum, aluminum alloy, or steel. This allows the holders 104 to have the desired rigidity and thermal conductivity. However, the holders 104 may be made of resin if a rigidity and thermal conductivity above a certain level can be obtained. The energy storage module 100 also includes a filler 106 interposed between the energy storage devices 1 and the holders 104. The filler 106 will be described in detail later.

[0027] Furthermore, the energy storage module 100 includes a pair of end plates 108. Multiple energy storage devices 1 and multiple holders 104, which are alternately stacked in the second direction C, are restrained by the pair of end plates 108. The energy storage module 100 is fixed to a battery pack (not shown) via the end plates 108 by screw fastening or the like.

[0028] Furthermore, the energy storage module 100 includes a busbar 110 (current collector plate) that electrically connects a plurality of electrode leads. The plurality of energy storage devices 1 are electrically connected to each other by electrically connecting the first electrode lead 8 and the second electrode lead 10 of each energy storage device 1 to the busbar 110. For example, each electrode lead is joined to the busbar 110 by a known joining process such as laser welding. The manner of electrical connection of each electrode body 2 and the manner of electrical connection of each energy storage device 1 are not particularly limited. In each energy storage device 1, the plurality of electrode bodies 2 may be connected in series, in parallel, or a combination of series and parallel connections. Also, the plurality of energy storage devices 1 may be connected in series, in parallel, or a combination of series and parallel connections.

[0029] Furthermore, the energy storage module 100 includes a plurality of insulating members 112 extending in the first direction B. Each insulating member 112 has a support plate 114 and a cover portion 116. The support plate 114 and the cover portion 116 each extend in the first direction B. The busbar 110 is enclosed by the support plate 114 and the cover portion 116. The insulating members 112 will be described in detail later.

[0030] Figure 6 is a perspective view of the energy storage device 1 and holder 104 arranged in the second direction C. Figures 7(A) and 7(B) are cross-sectional views of a portion of the energy storage module 100 along a plane perpendicular to the axial direction A. Figure 8(A) is an enlarged view of a portion of the filler 106. Figure 8(B) is an enlarged view of the dashed area in Figure 7(A). Note that the interior of the housing section 12 is not shown in Figures 7(A), 7(B), and 8(B).

[0031] As shown in Figure 6, the holder 104 of this embodiment is plate-shaped and extends in the first direction B. The holder 104 has a plurality of recesses 118 arranged in the first direction B and a plurality of flat portions 120 connecting adjacent recesses 118. The holder 104 of this embodiment is corrugated, with repeated ridges and ridges in the first direction B. In other words, no matter which main surface side you look at it from, the plurality of recesses 118 and the plurality of flat portions 120 are arranged alternately in the first direction B. Also, the flat portions 120 on one main surface side constitute the bottom portion 118a of the recess 118 on the other main surface side (see Figure 7(A), etc.).

[0032] Therefore, each housing portion 12 of the energy storage devices 1 on both sides of the holder 104 can be fitted into the holder 104. This further enhances the stability of each energy storage device 1 in the energy storage module 100. A holder 104 having such a structure can be formed, for example, by press-forming a single metal plate. The holder 104 may be made of a plate material with a thickness such that the bottom portion 118a of the recess 118 on one main surface does not protrude further toward the other main surface than the bottom portion 118a of the recess 118 on the other main surface. In other words, in the thickness direction (second direction C) of the holder 104, the extending range of the recess 118 provided on one main surface and the extending range of the recess 118 provided on the other main surface do not have to overlap.

[0033] [Filler] Each recess 118 is a long groove in the axial direction A. Before the energy storage device 1 and holder 104 are assembled, the wall surface of each recess 118 is coated with filler 106. When the energy storage device 1 and holder 104 are assembled, each housing part 12 fits into each recess 118. As a result, as shown in Figures 7(A) and 7(B), the filler 106 is crushed and deformed by the housing part 12 and recess 118, and spreads into the gap between the housing part 12 and recess 118.

[0034] The distance between the recess 118, whose inner surface is composed of multiple planes, specifically the bottom portion 118a and a pair of inclined portions 118b described later, and the housing portion 12, which has a substantially circular cross-section, varies depending on the location. In particular, the boundary between the bottom portion 118a and the inclined portions 118b is the furthest from the housing portion 12. The filler 106 is then placed at least between the boundary between the bottom portion 118a and the inclined portions 118b and the housing portion 12. More filler 106 can be packed into this boundary portion compared to other parts. In this way, by filling the recess 118, which is composed of multiple planes, with filler 106, the amount of filler 106 can be locally increased without unnecessarily enlarging the space of the recess 118. This enables efficient heat absorption of the energy storage device 1. The filler 106 may also be interposed between the flat portion 120 and the sealing portion 14, more specifically between the flat portion 120 and the second portion 14b. This configuration allows for an increase in the amount of filler 106 between the pair of holders 104. Furthermore, if the filler 106 is adhesive, it is possible to increase the fixing strength between the energy storage device 1 and the holder 104. Additionally, the increased contact area between the holder 104 and the filler 106 promotes heat dissipation from the energy storage device 1 to the holder 104. Moreover, the filler 106 may cover the end face of the housing section 12 in the axial direction A. The filler 106 covering the end face of the housing section 12 protects it from ejected materials such as gas or flames emitted from other energy storage devices 1.

[0035] The filler 106 in this embodiment is thixotropic. Thixotropic means that when subjected to stress, its viscosity decreases and it becomes liquid, and when left standing, its viscosity increases and it becomes solid. Preferably, the filler 106 has an initial viscosity (or initial viscosity) of 10,000 mPa·s or more. Because the filler 106 is thixotropic, in the state before the energy storage device 1 and holder 104 are assembled, the filler 106 can easily maintain its shape on the wall surface of the recess 118. This prevents the filler 106 from dripping out of the recess 118. On the other hand, when the energy storage device 1 and holder 104 are assembled, the filler 106 is subjected to stress and easily deforms. This makes it easy to fill the space between the housing 12 and the recess 118 with the filler 106 without any gaps.

[0036] Furthermore, the filler 106 has the property that its thermal conductivity at the first temperature is lower than its thermal conductivity at the second temperature, which is lower than the first temperature. In other words, the thermal conductivity of the filler 106 decreases as the temperature rises. The first temperature is, for example, the temperature when each electrode body 2 is in an abnormal state, for example, 100°C or higher. The second temperature is, for example, the temperature when each electrode body 2 is in a normal state, in other words, when the charge / discharge state of each electrode body 2 is within the design range, for example, -30°C or higher and 60°C or lower. Furthermore, the thermal conductivity of the filler 106 at the first temperature is preferably 0.1 W / m·K or lower, and the thermal conductivity of the filler 106 at the second temperature is preferably 0.5 W / m·K or higher. Furthermore, the difference between the thermal conductivity at the first temperature and the thermal conductivity at the second temperature is preferably 0.5 W / m·K or higher. The first temperature, the second temperature, and the thermal conductivity at each temperature can be appropriately set based on experiments, simulations, etc. by the designer.

[0037] When each electrode body 2 is in a normal state and the filler 106 is at a second temperature, as shown in Figure 7(A), the filler 106 promotes heat transfer from each electrode body 2 to the holder 104 due to its own thermal conductivity. Preferably, the thermal conductivity of the holder 104 is higher than the thermal conductivity of the filler 106 at the second temperature. With this configuration, when the energy storage device 1 in a normal state heats up, the heat can be quickly dissipated into the energy storage module 100 via the filler 106 and the holder 104. On the other hand, when each electrode body 2 falls into an abnormal state and the filler 106 reaches a first temperature, as shown in Figure 7(B), the thermal conductivity of the filler 106 decreases, suppressing heat transfer from each electrode body 2 to the holder 104. Preferably, the thermal conductivity of the filler 106 decreases reversibly. Note that the filler 106 that has reached the first temperature may still have some heat transfer properties. In this case, the heat from the electrode body 2, which has entered an abnormal state, can be dissipated through the holder 104.

[0038] As described above, examples of filler 106 that have a thermal conductivity that changes with temperature and are thixotropic include those mainly composed of urethane or silicone, with metal hydroxide added. It is desirable that the metal hydroxide be contained in a mass ratio of 50% to 90% of the total mass of the materials constituting the filler 106. When exposed to high temperatures, the metal hydroxide releases water vapor through thermal decomposition. As a result, the metal hydroxide exhibits an endothermic effect and transforms into a metal oxide with heat resistance and insulating properties. Furthermore, as the main materials such as urethane and silicone decompose and volatilize at high temperatures, a porous structure of metal oxide is formed, exhibiting an insulating effect. That is, the thermal conductivity is greatly reduced. Although it is conceivable that the battery may be heated to over 800°C due to thermal runaway, the formed porous structure of the metal oxide can maintain its insulating properties even at such high temperatures. Examples of such metal hydroxides include aluminum hydroxide (Al(OH)3), magnesium hydroxide (Mg(OH)2), calcium hydroxide (Ca(OH)2), zinc hydroxide (Zn(OH)2), iron hydroxide (Fe(OH)2), manganese hydroxide (Mn(OH)2), zirconium hydroxide (Zr(OH)2), and gallium hydroxide (Ga(OH)3). For example, aluminum hydroxide undergoes dehydration decomposition at temperatures above 200°C, breaking down into approximately 66% Al2O3 and approximately 34% water vapor, exhibiting an endothermic reaction. This reaction absorbs the heat generated by a battery cell experiencing thermal runaway, reducing the amount of heat transferred to the holder 104. Furthermore, as the main material subsequently decomposes and volatilizes at high temperatures, the porous aluminum oxide exhibits an insulating effect.

[0039] As shown in Figure 8(A), the filler 106 of this embodiment may also contain a plurality of hollow glass beads 122. The hollow glass beads 122 have higher flame resistance than the constituent materials of the filler 106. Therefore, even if the constituent materials of the filler 106 are burned away, the hollow glass beads 122 are likely to remain between the housing portion 12 and the recess 118. The remaining hollow glass beads 122 can prevent thermal connection between the housing portion 12 and the holder 104 of the electrode body 2 that has entered an abnormal state. In addition, because they are hollow, the hollow glass beads 122 are light. Therefore, the weight of the energy storage module 100 can be reduced.

[0040] [glue] As shown in Figure 6, each flat portion 120 extends parallel to the sealing portion 14. Before the energy storage device 1 and holder 104 are assembled, adhesive 124 is applied to each flat portion 120. As the adhesive 124, a known insulating adhesive or the like can be used. When the energy storage device 1 and holder 104 are assembled, each second portion 14b of the sealing portion 14 and each flat portion 120 are pressed against each other. As a result, as shown in Figure 8(B), the adhesive 124 is crushed and deformed by the second portion 14b and the flat portion 120, and a layer of adhesive 124 is formed between the second portion 14b and the flat portion 120. The holder 104 is bonded to the sealing portion 14 by the adhesive 124 and holds the energy storage device 1. This increases the rigidity of the energy storage device 1.

[0041] Furthermore, at least a portion of the energy storage device 1 is sandwiched between two adjacent holders 104. In this case, each second portion 14b is sandwiched in the second direction C by a pair of flat portions 120. Each flat portion 120 is then bonded to the second portion 14b with adhesive 124. This further increases the rigidity of the energy storage module 100. It is preferable that the adhesive 124, like the filler 106, has thixotropy. Also, the adhesive 124, like the filler 106, may have the property of decreasing thermal conductivity as the temperature rises.

[0042] [Honeycomb structure] As shown in Figures 7(A) and 7(B), each recess 118 in this embodiment is trapezoidal, or in other words, its cross-section perpendicular to the axial direction A is trapezoidal. That is, each recess 118 has a bottom portion 118a extending in the first direction B, and a pair of inclined portions 118b extending diagonally from both ends of the bottom portion 118a in the first direction B. Since the length of the pair of inclined portions 118b is equal to the angle with respect to the bottom portion 118a, each recess 118 is an isosceles trapezoidal column. The end of each inclined portion 118b opposite to the bottom portion 118a is connected to the flat portion 120. Therefore, each inclined portion 118b connects the bottom portion 118a and the flat portion 120. Two holders 104 adjacent in the second direction C are stacked such that the internal spaces of their respective recesses 118 face each other. This creates a plurality of hexagonal columnar spaces surrounding each housing portion 12. The energy storage module 100 has a honeycomb structure in which multiple hexagonal prism-shaped spaces are arranged. This further increases the rigidity of the energy storage module 100.

[0043] [Claw portion and reinforcing plate] Figure 9(A) is a perspective view of a portion of the holder 104. Figure 9(B) is a plan view of a portion of the holder 104. Figure 10(A) is a perspective view of the energy storage module 100. Figure 10(B) is a cross-sectional view of a portion of the energy storage module 100 along a plane perpendicular to the second direction C. As shown in Figures 9(A) and 9(B), the holder 104 of this embodiment has a plurality of claw portions 126 at the end of the holder 104 in the axial direction A. Each claw portion 126 bends toward the adjacent energy storage device 1 and extends in a direction intersecting the axial direction A. Each claw portion 126 closes the end in the axial direction A in the internal space of the recess 118.

[0044] In this embodiment, the holder 104 has a claw portion 126 at only one end in the axial direction A (see Figure 6). Two adjacent holders 104 are positioned such that the ends on which the claw portions 126 are provided are opposite to each other. Therefore, when viewing the energy storage module 100 from the axial direction A, multiple rows of claw portions 126 extending in the first direction B are arranged at intervals in the second direction C.

[0045] Furthermore, in Figures 6, 9(A), and 9(B), two claw portions 126 with different shapes are provided for one recess 118, but the configuration is not limited to this, and three or more claw portions 126 may be provided for one recess 118. Also, claw portions 126 may be provided that have the same or similar shape as the recess 118 as viewed from the axial direction A. In addition, notches may be provided in the bendable portion of the holder 104, for example, at the boundary between the bottom portion 118a and the inclined portion 118b, or at the boundary between the recess 118 and the claw portion 126. These notches facilitate the processing when forming the bottom portion 118a and the inclined portion 118b, and when forming the claw portion 126.

[0046] Furthermore, as shown in Figures 10(A) and 10(B), the energy storage module 100 of this embodiment includes a pair of reinforcing plates 128. As an example, the reinforcing plates 128 are made of metals such as aluminum, aluminum alloy, and steel; thermoplastic resins such as polypropylene (PP), polybutylene terephthalate (PBT), polycarbonate (PC), and Noryl® resin (modified PPE); or fiber-reinforced plastics (FRP) including carbon fiber reinforced plastics (CFRP) and glass fiber reinforced plastics (GFRP).

[0047] A pair of reinforcing plates 128 sandwich a laminate composed of multiple energy storage devices 1, multiple holders 104, and a pair of end plates 108 in the axial direction A. Each end plate 108 can be fixed to the laminate by known fixing means. In this way, the reinforcing plates 128 are directly or indirectly connected to the multiple holders 104. The reinforcing plates 128 in this embodiment are supported by multiple claw portions 126. That is, the claw portions 126 are used as a support structure for the reinforcing plates 128. The reinforcing plates 128 in this embodiment also have multiple ribs 130 arranged at predetermined intervals in the first direction B. Each rib 130 is provided on the main surface of the reinforcing plate 128 facing away from the laminate and extends in the stacking direction of the energy storage devices 1 and holders 104, i.e., the second direction C. In addition, a groove extending in the second direction C is provided on the surface of each rib 130 facing the laminate side.

[0048] By providing reinforcing plates 128 to the laminate, the rigidity of the energy storage module 100 can be increased. In addition, by transferring the heat from each energy storage device 1 to the reinforcing plates 128, each energy storage device 1 can be cooled. Furthermore, by connecting or incorporating cooling pipes into the reinforcing plates 128, the cooling efficiency of the energy storage devices 1 can be further increased. Moreover, if the temperature of the electrode body 2 rises excessively and gas is ejected from the housing section 12, or if flames are generated by this gas, the diffusion of gas and flames can be suppressed. This helps to prevent the fire from spreading to other housing sections 12.

[0049] Furthermore, the presence of ribs 130 in the reinforcing plate 128 further increases the rigidity of the reinforcing plate 128 and, consequently, the energy storage module 100. The grooves in the ribs 130 can also function as ducts through which gas ejected from each housing section 12 flows. Note that the reinforcing plate 128 may consist of only one plate, or it may not have ribs 130.

[0050] The diffusion of gas and flames ejected from the containment section 12 is also suppressed by the claw portion 126. That is, the diffusion of gas and flames is suppressed by the claw portion 126 which overlaps with the containment section 12 ejecting gas and flames in the axial direction A. Furthermore, if the reinforcing plate 128 is not provided, gas and flames ejected from the containment section 12 may pass through the gaps in the claw portion 126 or break the claw portion 126 and reach the battery pack (not shown). When this gas and flame hits the battery pack and bounces back, the claw portion 126 which overlaps with the other containment section 12 in the axial direction A can prevent the bounced gas and flame from reaching other containment sections 12.

[0051] [Insulating material] Figures 11, 12(A), and 12(B) are perspective views of a portion of the energy storage module 100. Figure 13 is a cross-sectional view of a portion of the energy storage module 100 along a plane perpendicular to the first direction B. Note that Figure 11 shows the module with some of the insulating material 112 removed. Also, Figure 12(A) shows the module with the cover portion 116 removed.

[0052] The energy storage module 100 includes an insulating member 112 as described above. The insulating member 112 has a support plate 114 and a cover portion 116. As shown in Figure 11, the insulating member 112 is placed on the end of the holder 104 that does not have a claw portion 126. Therefore, when viewing the energy storage module 100 from the axial direction A, rows of claw portions 126 extending in the first direction B and the insulating member 112 are arranged alternately in the second direction C. The insulating member 112 is made of, for example, an insulating resin. Examples of resins that make up the insulating member 112 include thermoplastic resins such as polypropylene (PP), polybutylene terephthalate (PBT), polycarbonate (PC), and Noryl® resin (modified PPE); and fiber-reinforced plastics (FRP) including carbon fiber reinforced plastics (CFRP) and glass fiber reinforced plastics (GFRP).

[0053] As shown in Figure 12(A), first the support plate 114 is placed on the holder 104. The bus bar 110 is placed on the support plate 114. The electrode leads of the two energy storage devices 1, which are aligned on either side of the bus bar 110 when viewed from the axial direction A, are joined to the bus bar 110 on the support plate 114. Then, as shown in Figure 12(B), the cover portion 116 is attached to the support plate 114. As a result, the bus bar 110 on the support plate 114 is covered by the cover portion 116. The cover portion 116 is fixed to the support plate 114 by a known fixing method, such as a lance engagement. The cover portion 116 also has a plurality of protrusions 116a that project towards the holder 104 side, more specifically towards the internal space of the recess 118, when viewed from the axial direction A.

[0054] Figure 1 3As shown, the insulating member 112 is interposed between the multiple electrode leads and the holder 104. Specifically, the support plate 114 is interposed between the holder 104 on which the insulating member 112 is placed and the first electrode lead 8 and the second electrode lead 10. The support plate 114 is also interposed between the holder 104 and the busbar 110. On the other hand, the protruding portion 116a of the lid portion 116 fits below the claw portion 126 of the holder 104 adjacent to the holder 104 on which the insulating member 112 is placed. As a result, the lid portion 116 is interposed between the claw portion 126 and the first electrode lead 8 and the second electrode lead 10. The lid portion 116 is also interposed between the claw portion 126 and the busbar 110. These measures suppress, or in other words, provide insulation, from electrical connection between the electrode leads and busbar 110 and the holder 104. Furthermore, the protruding portion 116a and the claw portion 126 also have the function of blocking gas and flames ejected from the housing portion 12.

[0055] As described above, the energy storage module 100 according to this embodiment includes a holder 104 for holding the energy storage device 1. Holding the energy storage device 1 with the holder 104 increases the rigidity of the energy storage module 100. In addition, the heat absorption effect of the holder 104 can cool each electrode body 2.

[0056] Furthermore, the energy storage module 100 includes a filler 106 interposed between the energy storage device 1 and the holder 104. By filling the gap between the energy storage device 1 and the holder 104 with the filler 106, heat transfer from each electrode body 2 to the holder 104 can be promoted. In addition, each electrode body 2 can be cooled by the heat-absorbing effect of the filler 106 itself. Furthermore, the posture of the energy storage device 1 can be made more stable. As a result, the electrical connection state between each energy storage device 1 and the busbar 110 can be maintained more stably, and damage to each energy storage device 1 can be further suppressed. Thus, the power generation performance and safety of the energy storage module 100 can be improved.

[0057] Furthermore, the filler 106 has the property of decreasing thermal conductivity as its temperature rises. As a result, when each electrode body 2 is in a normal state, heat from each electrode body 2 can be actively transferred to the holder 104 via the filler 106. This reduces temperature unevenness between the electrode bodies 2 throughout the entire energy storage module 100. Also, if each electrode body 2 enters an abnormal state and reaches the first temperature, the filler 106 can suppress heat transfer from each electrode body 2 to the holder 104. This prevents thermal runaway in one electrode body 2 from spreading to other electrode bodies 2 in a chain reaction.

[0058] Therefore, the energy storage module 100 of this embodiment makes it possible to achieve both cooling of the electrode body 2 during normal operation and suppression of heat diffusion during abnormal operation, thereby enhancing the safety of the energy storage module 100. Furthermore, the effects of the filler 106 described above can be enjoyed not only when an energy storage device 1 in which multiple electrode bodies 2 are sealed in a film outer casing 4 is held by the holder 104, but also when multiple energy storage devices in which each electrode body 2 is housed in an outer can are held by the holder 104.

[0059] Furthermore, the filler 106 in this embodiment contains hollow glass beads 122. This makes it possible to reduce the weight of the filler 106 and, consequently, the energy storage module 100. It also makes it easier to maintain the heat insulating effect of the filler 106 when the electrode body 2 enters an abnormal state. In addition, the filler 106 in this embodiment is thixotropic. This makes it easier to assemble the energy storage module 100. It also makes it possible to improve the reliability and yield when manufacturing the energy storage module 100.

[0060] Furthermore, the energy storage device 1 of this embodiment has a pouch structure in which multiple electrode bodies 2 are housed in a film outer casing 4. This makes it possible to lighten the energy storage module 100 compared to the case in which each electrode body 2 is individually sealed in an outer can. Note that the number of electrode bodies 2 and housing parts 12 in the energy storage device 1 may be one. In addition, the holder 104 of this embodiment is bonded to the sealing part 14 of the energy storage device 1 to hold the energy storage device 1. The energy storage device 1 is long in the first direction B, and the film outer casing 4 is highly flexible. Therefore, the energy storage device 1 is prone to bending. In contrast, by bonding the holder 104 to the sealing part 14, it becomes possible to hold the energy storage device 1 more stably. Therefore, the rigidity of the energy storage module 100 can be increased, and thus the safety of the energy storage module 100 can be increased. Furthermore, this improvement in rigidity makes it easier to make the holder 104 thinner, so further weight reduction of the energy storage module 100 can be expected.

[0061] Furthermore, in at least some of the energy storage devices 1, holders 104 are bonded to both sides of the sealing portion 14. This further improves the rigidity of the energy storage module 100. In addition, in this embodiment, hexagonal prism-shaped spaces that house each housing portion 12 are arranged to form a honeycomb-shaped energy storage device holding structure. This further improves the rigidity of the energy storage module 100.

[0062] Furthermore, the holder 104 of this embodiment has a plurality of claw portions 126, and when viewed from the axial direction A, a part of each hexagonal prism space is blocked by the claw portions 126. This reduces the risk of gas or flames escaping from each housing portion 12 and spreading, damaging other housing portions 12. Thus, the safety of the energy storage module 100 can be further improved. In addition, the energy storage module 100 of this embodiment is equipped with a reinforcing plate 128 connected to the holder 104. This improves the rigidity of the energy storage module 100 and the heat dissipation of each energy storage device 1. Furthermore, it can suppress the spread of fire to other housing portions 12 when gas or flames escaping from each housing portion 12.

[0063] Furthermore, the energy storage module 100 of this embodiment includes an insulating member 112 interposed between multiple electrode leads and holders 104. This suppresses short circuits between the two, further improving the power generation performance and safety of the energy storage module 100. Also, a portion of the hexagonal prism-shaped space, viewed from the axial direction A, is blocked by the insulating member 112. Therefore, when gas or flames are ejected from each housing section 12, the spread of fire to other housing sections 12 can be suppressed. In addition, in this embodiment, the busbars 110 are placed on the support plate 114 and covered with a lid 116. This suppresses short circuits between the busbars 110 and holders 104, further improving the power generation performance and safety of the energy storage module 100. Furthermore, since the insulating member 112 is used as a support member for the busbars 110, the number of parts in the energy storage module 100 can be reduced.

[0064] The embodiments of this disclosure have been described in detail above. The embodiments described above are merely examples of how to implement this disclosure. The content of the embodiments does not limit the technical scope of this disclosure, and many design changes, such as changes, additions, and deletions of components, are possible as long as they do not depart from the spirit of the invention as defined in the claims. A new embodiment with design changes will have the combined effects of both the embodiment and the variation. In the embodiments described above, the content in which such design changes are possible is emphasized with notations such as "of this embodiment" or "in this embodiment," but design changes are also permitted even if there are no such notations. Furthermore, any combination of components included in each embodiment is also valid as an embodiment of this disclosure. The hatching applied to the cross-section in the drawings does not limit the material of the object to which the hatching is applied.

[0065] The invention relating to the above-described embodiment may be specified by the following items. (Item 1) Energy storage device (1), The device comprises a holder (104) for holding the energy storage device (1), The energy storage device (1) includes a cylindrical electrode body (2), a film outer casing (4) having a housing portion (12) that encloses the electrode body (2), and a sealing portion (14) that seals the housing portion (12), The holder (104) is bonded to the sealing portion (14). Energy storage module (100). (Item 2) The energy storage device (1) has a plurality of electrode bodies (2) and a plurality of housing parts (12) that enclose each of the plurality of electrode bodies (2). The sealing portion (14) seals each housing portion (12) and connects multiple housing portions (12) to each other. The energy storage module (100) described in item 1. (Item 3) Multiple energy storage devices (1) are arranged in a first direction (B) in which multiple electrode bodies (2) are aligned, and in a second direction (C) that intersects with the axial direction (A) of the electrode bodies (2), It comprises multiple energy storage devices (1) and multiple holders (104) arranged alternately in a second direction (C), The two adjacent holders (104) sandwich the sealing portion (14), and each is adhered to the sealing portion (14). The energy storage module (100) described in item 2. (Item 4) Each holder (104) is plate-shaped extending in a first direction (B) and has a plurality of trapezoidal columnar recesses (118) arranged in the first direction (B) into which each housing portion (12) fits, and a plurality of flat portions (120) that connect adjacent recesses (118) and are adhered to the sealing portion (14). The energy storage module (100) has a honeycomb structure in which multiple hexagonal prism-shaped spaces surrounding the housing section (12) are arranged. The energy storage module (100) described in item 3. (Item 5) The holder (104) has a plurality of claw portions (126) at the end of the electrode body (2) in the axial direction (A) that are bent toward the adjacent energy storage device (1). A battery storage module (100) as described in any of items 1 to 4. (Item 6) Viewed from the axial direction (A), the claw portion (126) overlaps with the housing portion (12). Energy storage module (100) as described in item 5. (Item 7) It includes a reinforcing plate (128) connected to the holder (104), A battery storage module (100) as described in any of items 1 through 6. (Item 8) The reinforcing plate (128) has ribs (130) extending in the stacking direction (C) of the energy storage device (1) and the holder (104). Energy storage module (100) as described in item 7. (Item 9) The energy storage device (1) has a plurality of electrode bodies (2) and a plurality of electrode leads (8, 10) that are electrically connected to each electrode body (2) and protrude from the sealing portion (14). The energy storage module (100) includes an insulating member (112) interposed between a plurality of electrode leads (8, 10) and a holder (104). A battery storage module (100) as described in any of items 1 through 8. (Item 10) It is equipped with a busbar (110) that electrically connects multiple electrode leads (8, 10), The insulating member (112) has a support plate (114) on which the busbar (110) is placed, and a cover portion (116) that covers the busbar (110) on the support plate (114). Energy storage module (100) as described in item 9. (Item 11) The lid portion (116) has a plurality of protrusions (116a) that project toward the holder (104) when viewed from the axial direction (A) of the electrode body (2). Energy storage module (100) as described in item 10. (Item 12) Energy storage device (1), A holder (104) that holds the energy storage device (1), The device comprises a filler (106) interposed between the energy storage device (1) and the holder (104), the filler having a thermal conductivity at a first temperature that is lower than the thermal conductivity at a second temperature that is lower than the first temperature, Energy storage module (100). (Item 13) The thermal conductivity of the holder (104) is higher than that of the filler (106) at the second temperature. Energy storage module (100) as described in item 12. (Item 14) The filler (106) contains hollow glass beads (122). Energy storage module (100) as described in item 12 or 13. (Item 15) The filler (106) is thixotropic, A battery storage module (100) as described in any of items 12 to 14. (Item 16) The energy storage device (1) is A cylindrical electrode body (2), The device comprises a film outer casing (4) having a housing portion (12) that encloses the electrode body (2), and a sealing portion (14) that seals the housing portion (12), A battery storage module (100) as described in any of items 12 to 15. (Item 17) The holder (104) is bonded to the sealing portion (14). Energy storage module (100) as described in item 16. (Item 18) The energy storage device (1) has a plurality of electrode bodies (2) and a plurality of housing parts (12) that enclose each of the plurality of electrode bodies (2). The sealing portion (14) seals each housing portion (12) and connects multiple housing portions (12) to each other. Energy storage module (100) as described in item 17. (Item 19) The filler (106) covers the end face of the housing portion (12) in the axial direction (A) of the electrode body (2). A battery storage module (100) as described in any of items 16 to 18. (Item 20) Multiple energy storage devices (1) are arranged in a first direction (B) in which multiple electrode bodies (2) are aligned, and in a second direction (C) that intersects with the axial direction (A) of the electrode bodies (2), It comprises multiple energy storage devices (1) and multiple holders (104) arranged alternately in a second direction (C), The two adjacent holders (104) sandwich the sealing portion (14), and each is adhered to the sealing portion (14). Energy storage module (100) as described in item 18. (Item 21) Each holder (104) is plate-shaped extending in a first direction (B) and has a plurality of trapezoidal columnar recesses (118) arranged in the first direction (B) into which each housing portion (12) fits, and a plurality of flat portions (120) that connect adjacent recesses (118) and are adhered to the sealing portion (14). The energy storage module (100) has a honeycomb structure in which multiple hexagonal prism-shaped spaces surrounding the housing section (12) are arranged. Energy storage module (100) as described in item 20. (Item 22) The recess (118) comprises a bottom portion (118a) and an inclined portion (118b) connecting the bottom portion (118a) and the flat portion (120), The filler (106) is placed at least between the boundary of the bottom (118a) and the inclined portion (118b) and the housing portion (12). Energy storage module (100) as described in item 21. (Item 23) The filler (106) is interposed between the flat portion (120) and the sealing portion (14). Energy storage module (100) as described in item 21 or 22. (Item 24) The holder (104) has a plurality of claw portions (126) at the end of the electrode body (2) in the axial direction (A) that are bent toward the adjacent energy storage device (1). A battery storage module (100) as described in any of items 16 to 23. (Item 25) Viewed from the axial direction (A), the claw portion (126) overlaps with the housing portion (12). Energy storage module (100) as described in item 24. (Item 26) It includes a reinforcing plate (128) connected to the holder (104), A battery storage module (100) as described in any of items 16 to 25. (Item 27) The reinforcing plate (128) has ribs (130) extending in the stacking direction (C) of the energy storage device (1) and the holder (104). Energy storage module (100) as described in item 26. (Item 28) The energy storage device (1) has a plurality of electrode bodies (2) and a plurality of electrode leads (8, 10) that are electrically connected to each electrode body (2) and protrude from the sealing portion (14). The energy storage module (100) includes an insulating member (112) interposed between a plurality of electrode leads (8, 10) and a holder (104). A battery storage module (100) as described in any of items 16 to 27. (Item 29) It is equipped with a busbar (110) that electrically connects multiple electrode leads (8, 10), The insulating member (112) has a support plate (114) on which the busbar (110) is placed, and a cover portion (116) that covers the busbar (110) on the support plate (114). Energy storage module (100) as described in item 28. (Item 30) The lid portion (116) has a plurality of protrusions (116a) that project toward the holder (104) when viewed from the axial direction (A) of the electrode body (2). Energy storage module (100) as described in item 29. [Industrial applicability]

[0066] This disclosure can be used in energy storage modules. [Explanation of Symbols]

[0067] 1 Energy storage device, 2 Electrode body, 4 Film outer casing, 12 Housing section, 14 Sealing section, 100 Energy storage module, 104 Holder, 106 Filler, 110 Busbar, 112 Insulating member, 114 Support plate, 116 Lid section, 118 Recess, 120 Flat section, 122 Hollow glass beads, 124 Adhesive, 126 Claw section, 128 Reinforcement plate.

Claims

1. Energy storage device, A power storage module comprising a holder for holding the aforementioned power storage device, The energy storage device comprises a cylindrical electrode body, a housing portion enclosing the electrode body, and a film outer casing having a sealing portion that seals the housing portion. The holder is bonded to the sealing portion, The energy storage device comprises a plurality of electrode bodies and a plurality of housings that individually enclose the plurality of electrode bodies. The sealing portion seals each housing portion and connects the multiple housing portions to each other. The energy storage module comprises a plurality of energy storage devices arranged in a first direction in which the plurality of electrode bodies are aligned and in a second direction intersecting the axial direction of the electrode bodies, The system comprises a plurality of the aforementioned energy storage devices and a plurality of the aforementioned holders arranged alternately in the second direction, The two adjacent holders sandwich the sealing portion, and each is adhered to the sealing portion. Energy storage module.

2. Each holder is plate-shaped extending in the first direction and has a plurality of trapezoidal columnar recesses arranged in the first direction into which each housing portion is fitted, and a plurality of flat portions connecting adjacent recesses and being adhered to the sealing portion. The energy storage module has a honeycomb structure in which multiple hexagonal prism-shaped spaces surrounding the housing are arranged. The energy storage module according to claim 1.

3. A power storage device, A power storage module comprising a holder for holding the aforementioned power storage device, The energy storage device comprises a cylindrical electrode body, a housing portion enclosing the electrode body, and a film outer casing having a sealing portion that seals the housing portion. The holder is bonded to the sealing portion, The energy storage module is interposed between the energy storage device and the holder and comprises a filler whose thermal conductivity at a first temperature is lower than that at a second temperature, and whose thermal conductivity at a second temperature is lower than that at the first temperature. Energy storage module.

4. The thermal conductivity of the holder is higher than the thermal conductivity of the filler at the second temperature. The energy storage module according to claim 3.

5. The aforementioned filler contains hollow glass beads. The energy storage module according to claim 3 or 4.

6. The aforementioned filler is thixotropic, The energy storage module according to claim 3 or 4.

7. The filler covers the end face of the housing portion in the axial direction of the electrode body. The energy storage module according to claim 3 or 4.

8. The energy storage device comprises a plurality of electrode bodies and a plurality of housings that individually enclose the plurality of electrode bodies. The sealing portion seals each housing portion and connects the multiple housing portions to each other. Multiple energy storage devices arranged in a first direction in which multiple electrode bodies are aligned and in a second direction intersecting the axial direction of the electrode bodies, The system comprises a plurality of the aforementioned energy storage devices and a plurality of the aforementioned holders arranged alternately in the second direction, The two adjacent holders sandwich the sealing portion, and each is bonded to the sealing portion. Each holder is plate-shaped extending in the first direction and has a plurality of trapezoidal columnar recesses arranged in the first direction into which each housing portion is fitted, and a plurality of flat portions connecting adjacent recesses and being adhered to the sealing portion. The energy storage module has a honeycomb structure in which multiple hexagonal prism-shaped spaces surrounding the housing are arranged, The recess comprises a bottom portion and an inclined portion connecting the bottom portion and the flat portion. The filler is disposed at least between the boundary between the bottom and the inclined portion and the housing portion. The energy storage module according to claim 3 or 4.

9. The filler is interposed between the flat portion and the sealing portion. The energy storage module according to claim 8.

10. The holder has a plurality of claw portions at the end of the electrode body in the axial direction, which are bent toward the adjacent energy storage device. The energy storage module according to any one of claims 1 to 4.

11. Viewed from the axial direction, the claw portion overlaps with the housing portion. The energy storage module according to claim 10.

12. The holder is equipped with a reinforcing plate connected to the holder, The energy storage module according to any one of claims 1 to 4.

13. The reinforcing plate has ribs extending in the stacking direction of the energy storage device and the holder. The energy storage module according to claim 12.

14. The energy storage device has a plurality of electrode bodies and a plurality of electrode leads that are electrically connected to each electrode body and protrude from the sealing portion. The energy storage module includes an insulating member interposed between a plurality of electrode leads and the holder. The energy storage module according to any one of claims 1 to 4.

15. The device includes a busbar that electrically connects multiple electrode leads, The insulating member comprises a support plate on which the busbar is placed, and a cover portion that covers the busbar on the support plate. The energy storage module according to claim 14.

16. The cover portion has a plurality of protrusions that project toward the holder side when viewed from the axial direction of the electrode body. The energy storage module according to claim 15.

Images