Energy Storage Module

Abstract

An electrical storage module comprising: a plurality of electrical storage devices; and a holder having a plurality of housing parts for housing the electrical storage devices, wherein each of the electrical storage devices has an outer circumferential surface, a first end surface disposed at one end of the outer circumferential surface, and a second end surface disposed at the other end of the outer circumferential surface so as to face the first end surface in a first direction, the inner circumferential surfaces of the housing parts face the outer circumferential surfaces of the electrical storage devices, each of the inner circumferential surfaces has an annular seal member which presses the outer circumferential surface, and resin members are housed in spaces defined by the inner circumferential surfaces of the housing parts, the outer circumferential surfaces of the electrical storage devices, and the seal members.

Description

[Technical field]

[0001] The present disclosure relates to an energy storage module. [Background technology]

[0002] In general, an energy storage module includes a holder made of resin or the like in order to fix or hold a plurality of energy storage devices. In an energy storage module including a plurality of energy storage devices, it is important to reduce the weight and volume of the entire energy storage module and to improve the energy density of the energy storage module.

[0003] Patent Document 1 discloses a battery pack including: a plurality of cylindrical batteries; a holder having a plate-like shape with a first surface and a second surface that is the reverse side of the first surface, including a plurality of battery insertion holes penetrating in the plate thickness direction, the holder having a holder portion that holds the outer circumferential surfaces of the plurality of cylindrical batteries inserted into each of the plurality of battery insertion holes; and a plurality of adhesive bodies that include an adhesive hardened between the outer circumferential surface of the cylindrical batteries and an inner circumferential surface that forms the battery insertion hole of the holder portion, and that respectively join the outer circumferential surfaces of the plurality of cylindrical batteries to the plurality of inner circumferential surfaces of the holder portion, wherein all of the inner circumferential surfaces of the holder portion that form the battery insertion holes are The proposed battery pack includes an attitude regulating portion that regulates the range of attitudes that the cylindrical battery can take when inserted into an insertion hole, a separation portion that is spaced apart from the outer peripheral surface of the cylindrical battery around its entire circumference regardless of whether the cylindrical battery takes any attitude within the range of attitudes regulated by the attitude regulating portion, and a liquid injection groove that reaches the separation portion from the second surface, and each of the multiple adhesive bodies has a full-circumference bonding portion that bonds at least between the separation portion on the inner peripheral surface of the holder portion and a separation portion opposing portion on the outer peripheral surface of the cylindrical battery that faces the separation portion with the hardened adhesive around the entire circumference of the cylindrical battery. [Prior art documents] [Patent documents]

[0004] [Patent Document 1] JP 2019-8887 A Summary of the Invention [Problem to be solved by the invention]

[0005] In the proposal of Patent Document 1, the adhesive passes between the outer peripheral surface 23S of the battery and the position restricting portion 27Sr on the inner peripheral surface of the battery insertion hole (see FIG. 7), making it difficult to control the state of application of the adhesive. [Means for solving the problem]

[0006] One aspect of the present disclosure relates to an energy storage module comprising: a plurality of power storage devices; and a holder having a plurality of storage portions that respectively accommodate the plurality of power storage devices, wherein the power storage devices have an outer peripheral surface, a first end face located at one end of the outer peripheral surface, and a second end face located at the other end of the outer peripheral surface and facing the first end face in a first direction, an inner peripheral surface of the storage portion faces the outer peripheral surface of the power storage device, and the inner peripheral surface has an annular sealing member that presses against the outer peripheral surface, and a resin member is accommodated in a space defined by the inner peripheral surface of the storage portion, the outer peripheral surface of the power storage device, and the sealing member. Effect of the Invention

[0007] According to the present disclosure, the sealing member can prevent the resin material, such as an adhesive, from spreading in the gap between the housing of the holder and the power storage device, thereby providing an energy storage module that can easily manage the state in which the resin material is applied in the gap. [Brief description of the drawings]

[0008] [Figure 1] FIG. 1 is a perspective view of an energy storage module according to an embodiment of the present disclosure. [Diagram 2] 2 is a cross-sectional view of the electricity storage device of FIG. 1 taken along line II-II. [Figure 3A] FIG. 3 is an enlarged view of a main part of FIG. 2(a). [Figure 3B]3B is a view showing the state immediately before the power storage device is completely accommodated in the accommodation portion in FIG. 3A. [Figure 4] FIG. 2 is a perspective view of an example of a holder. [Figure 5A] FIG. 5 is a plan view of the holder of FIG. 4. [Figure 5B] 5 is a partial cross-sectional view of the holder taken along line AA in FIG. 4. [Figure 5C] 5 is a cross-sectional view of the holder taken along line BB in FIG. 4. [Figure 6A] FIG. 11 is a diagram showing a first modified example of the seal member. [Figure 6B] FIG. 11 is a diagram showing a second modified example of the seal member. [Figure 6C] FIG. 13 is a diagram showing a third modified example of the seal member. [Figure 6D] FIG. 13 is a diagram showing a fourth modified example of the seal member. [Figure 7A] FIG. 2 is a conceptual cross-sectional view showing the configuration of an electricity storage module. [Figure 7B] FIG. 13 is a diagram showing a first modified example of the power storage module. [Figure 7C] FIG. 13 is a diagram showing a second modified example of the power storage module. [Figure 8] 13A is a diagram showing a relationship between one of a first holder part and a second holder part of a third modified example of the power storage module and the power storage device, and FIG. 13B is a diagram showing a relationship between the other of the first holder part and the power storage device. [Figure 9] 13A is a diagram showing a relationship between one of a first holder part and a second holder part of a fourth modified example of the electricity storage module and the electricity storage device, and FIG. 13B is a diagram showing a relationship between the other of the first holder part and the electricity storage device. [Figure 10] 13A is a diagram showing a relationship between one of a first holder part and a second holder part of a fifth modified example of the power storage module and the power storage device, and FIG. 13B is a diagram showing a relationship between the other of the first holder part and the power storage device. DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS

[0009] An electric storage module according to one aspect of the present disclosure includes a plurality of electric storage devices and a holder having a plurality of storage sections for respectively storing the plurality of electric storage devices. The electric storage device has an outer peripheral surface, a first end face disposed at one end of the outer peripheral surface, and a second end face disposed at the other end of the outer peripheral surface and facing the first end face in a first direction. The inner peripheral surface of the storage section faces the outer peripheral surface of the electric storage device, and the inner peripheral surface of the storage section has an annular sealing member that presses the outer peripheral surface of the electric storage device. A resin member is stored in a space defined by the inner peripheral surface of the storage section, the outer peripheral surface of the electric storage device, and the sealing member. The sealing member prevents the liquid resin member injected into the sealed space before hardening from leaking out of the sealed space. This makes it easy to manage the application state of the resin member. The application state of the resin member is, for example, the amount of application or the area of ​​application.

[0010] Here, the first direction refers to the height direction or axial direction of the electricity storage device in which the first end face and the second end face face each other.

[0011] In addition, by accommodating a resin member in a space (hereinafter also referred to as a sealing space) defined by the inner circumferential surface of the accommodating section, the outer circumferential surface of the power storage device, and the seal member, the power storage device can be fixed to the inner circumferential surface of the accommodating section by its outer circumferential surface. That is, it is not necessarily necessary to provide a member for restricting the displacement of the first end face or the second end face of the power storage device in the height direction of the power storage device in the accommodating section of the holder. When a member for restricting the displacement of the power storage device in the height direction is not provided in the accommodating section, the height of the accommodating section can be reduced, and the energy density of the power storage module can be easily increased. However, the power storage module of the present disclosure may have a member for restricting the displacement in the height direction. The holder may be made of resin, and may contain a metal as long as electrical insulation between the power storage devices can be maintained.

[0012] The resin member is a concept that includes adhesives, sealing materials, sealants, etc., and has at least adhesive properties for fixing the outer peripheral surface of the power storage device to the inner peripheral surface of the housing of the holder. For example, an epoxy-based thermosetting adhesive may be used as the resin member. The resin member has fluidity when injected into the sealing space, and hardens and becomes solid after a predetermined time has passed since being injected into the sealing space. However, the hardened resin member may have a certain degree of viscosity or elasticity. The resin member may be heated when hardening.

[0013] The housing of the holder may include a through hole extending in the first direction. The outer peripheral surface of the electric storage device inserted into the through hole is pressed by an annular sealing member provided on the inner peripheral surface of the housing. At this time, the positional relationship between the electric storage device and the holder is provisionally determined by a reaction force acting between the inner peripheral surface and the outer peripheral surface. Then, a liquid resin member is injected into the sealed space from the first end face side or the second end face side of the electric storage device. Note that the sealing member can press the outer peripheral surface by abutting against the outer peripheral surface in a state of elastic deformation such as compression or bending. The sealing member and the holder may be made of the same material or different materials. When the sealing member and the holder are made of different resins, they may be molded by two-color molding or the like.

[0014] When viewed from the first end face side in the first direction, at least a part of the peripheral portion of the first end face may be exposed from the holder. Since the accommodation portion of the holder does not require a member to support the first end face of the power storage device, the accommodation portion may not have a portion that engages with the peripheral portion of the first end face. In the absence of such an engaging portion, at least a part of the peripheral portion of the first end face is not shielded by the holder. When viewed from the first end face side in the first direction, the entire peripheral portion of the first end face may be exposed without being shielded by the holder.

[0015] When viewed from the second end face side in the first direction, at least a portion of the peripheral edge of the second end face may be exposed from the holder. Since the accommodation portion of the holder does not require a member for supporting the second end face of the electricity storage device, the accommodation portion may not have a portion that engages with the peripheral edge of the second end face. In the absence of such an engaging portion, at least a portion of the peripheral edge of the second end face is not shielded by the holder. When viewed from the second end face side in the first direction, the entire peripheral edge of the second end face may be exposed without being shielded by the holder.

[0016] A plurality of sealing members may be provided on the inner circumferential surface of the housing portion along the first direction. By providing a plurality of sealing members, it is possible to more strictly control the application state of the resin member. For example, even if some of the sealing members are damaged, the remaining sealing members define the sealed space.

[0017] The sealing member may be cylindrical and include a part of the outer peripheral surface of the power storage device. Such a cylindrical sealing member has a large area of ​​surface contact with the outer peripheral surface of the power storage device, and has a large effect of positioning the power storage device in the housing and limiting the volume of the sealed space to within a specified range. This further reduces the possibility that the resin member will leak from the sealed space.

[0018] The holder may be composed of a plurality of parts connected in the first direction. For example, the holder may have a first holder part and a second holder part connected in the first direction. The first holder part has a first housing part that houses a part on the first end face side of the power storage device. The second holder part has a second housing part that houses a part on the second end face side of the power storage device. A first seal member is provided as a seal member on the inner circumferential surface of the housing part assigned to the first housing part. In this case, a resin member is housed in a first space defined by the inner circumferential surface of the housing part assigned to the first housing part, the outer circumferential surface of the power storage device, and the first seal member. That is, the first space constitutes at least a part of the sealed space. When the housing part has only the first seal member, the first space constitutes the entire sealed space.

[0019] A second seal member may be further provided as a seal member on the inner circumferential surface of the accommodation portion assigned to the second accommodation portion. In this case, a resin member is further accommodated in a second space defined by the inner circumferential surface of the accommodation portion assigned to the second accommodation portion, the outer circumferential surface of the power storage device, and the second seal member. The second space constitutes a part of the sealed space. When the accommodation portion has the first seal member and the second seal member, the first space and the second space constitute the entire sealed space.

[0020] The first space may be a space extending from the first seal member to the first end face. The second space may be a space extending from the second seal member to the second end face. In this case, the end portion on the first end face side and the end portion on the second end face side of the outer peripheral face of the power storage device can be bonded to the inner peripheral face of the housing part with a resin member. This can improve the strength of the power storage module.

[0021] To fabricate an electricity storage module in which the second space extends from the second seal member to the second end face, first, a portion of the electricity storage device on the first end face side is accommodated in a first accommodation section of a first holder part, the first end face is arranged vertically upward and the second end face is arranged vertically downward, and the first space is filled with a liquid resin material and hardened. Then, a portion of the electricity storage device on the second end face side is accommodated in a second accommodation section of a second holder part, and the orientation of the electricity storage device is reversed, so that the second end face is arranged vertically upward and the first end face is arranged vertically downward. Then, the second space is filled with a liquid resin material and hardened.

[0022] The second space may be a space extending from the second seal member to the first end face. In this case, the end of the outer peripheral surface of the power storage device on the first end face side and the vicinity of the boundary between the first holder part and the second holder part on the outer peripheral surface can be bonded to the inner peripheral surface of the housing part with a resin member. In this case as well, the strength of the power storage module can be improved.

[0023] To fabricate an electricity storage module in which the second space extends from the second seal member to the first end face, first, a portion of the electricity storage device on the second end face side is accommodated in the second accommodation section of the second holder part, the first end face is arranged vertically upward and the second end face is arranged vertically downward, and the second space is filled with a liquid resin material and hardened. Then, a portion of the electricity storage device on the first end face side is accommodated in the first accommodation section of the first holder part, the first end face is arranged vertically upward and the second end face is arranged vertically downward. Then, the first space is filled with a liquid resin material and hardened.

[0024] The power storage module may have a plate-shaped current collecting member that electrically connects the multiple power storage devices. An opening of the accommodation section is provided on an end face of the holder. The resin member may extend not only into the sealing space but also from the sealing space through the opening of the accommodation section to the end face of the holder. In this case, the current collecting member may abut against the end face of the holder via the resin member (more specifically, a resin member that covers at least a part of the end face of the holder). This makes it possible to bond the current collecting member and the holder.

[0025] The power storage device includes, for example, a case having an opening, an electrode body that is housed in the case and includes a first electrode and a second electrode, and a sealing member that seals the opening of the case. The case includes, for example, a tube portion, an opening end portion that corresponds to an opening formed at one end of the tube portion, and a bottom portion that closes the other end portion of the tube portion. In this case, the first end face includes the outer surface of the sealing member, and the second end face includes the outer surface of the bottom portion. The shape of the case may be, for example, cylindrical, but is not particularly limited.

[0026] The outer peripheral surface of the electricity storage device pressed by the sealing member may be the outer peripheral surface of the tubular portion or the outer peripheral surface of the open end. The outer diameter of the tubular portion is preferably the same as or larger than the outer diameter of the open end. An annular groove may be formed at the boundary between the open end and the tubular portion. In this case, the sealing member may be engaged with the groove. In addition, by pressing the sealing member against the case opening side of the groove (or the boundary between the groove and the open end),

[0027] In the above configuration, the flow of the resin member 400 toward the second end side in the sealed space S is restricted by the seal member 301, making it easy to manage the application state of the resin member 400. Also, the intrusion of the resin member 400 into the groove portion 210G is suppressed.

[0028] The electrode body generally has a first electrode having a first polarity, a second electrode having a second polarity, and a separator interposed therebetween. In the case of a cylindrical electricity storage device 200, the first electrode and the second electrode are generally wound with the separator interposed therebetween to form a cylindrical electrode body. The first electrode is electrically connected to a sealing member 230, and the second electrode is electrically connected to a case 210. That is, the sealing member 230 has the same polarity as the first electrode, and the case 210 has the same polarity as the second electrode.

[0029] The multiple power storage devices may be arranged side by side. The multiple power storage devices arranged side by side means, for example, that the axial directions of the electrode bodies of the multiple power storage devices are generally parallel, one end and the other end of the assembly of the multiple power storage devices are located in generally the same plane, and the cylindrical portions of the cases of the power storage devices are arranged adjacent to each other. The multiple power storage devices may be arranged side by side with their cases facing the same direction. In this case, the sealing members of the multiple power storage devices are all located in generally the same plane.

[0030] The electricity storage module usually has a first current collector having the same polarity as one of the polarities of the electricity storage devices as a plate-shaped current collecting member. The electricity storage module also usually has a second current collector having the same polarity as the other polarity. When the cases of the electricity storage devices are arranged side by side so that they face the same direction, it becomes easy to arrange both the first current collector and the second current collector together on the first end face side (specifically, the side having the sealing member) of the electricity storage device. In that case, it becomes unnecessary to provide a current collecting structure on the second end face side (specifically, the bottom side) of the electricity storage device. Therefore, it is possible to further reduce the space required by the electricity storage device in the axial direction.

[0031] The electrode body is formed, for example, by winding a first electrode and a second electrode with a separator interposed therebetween. When the power storage device is a battery, one of the first electrode and the second electrode is a positive electrode, and the other is a negative electrode. In addition, one of the first current collector and the second current collector is a positive electrode current collector, and the other is a negative electrode current collector.

[0032] The type of the power storage device is not particularly limited, and examples thereof include a primary battery, a secondary battery, a lithium ion capacitor, an electric double layer capacitor, a solid electrolytic capacitor, etc. Among them, a non-aqueous electrolyte secondary battery (including an all-solid-state battery) such as a lithium ion secondary battery having a high energy density can be preferably used.

[0033] Hereinafter, a power storage module according to an embodiment of the present invention will be described in detail with reference to the drawings, but the present invention is not limited to the following.

[0034] Fig. 1 is a perspective view of an electricity storage module according to an embodiment of the present disclosure. Fig. 2 is a cross-sectional view of the electricity storage device in Fig. 1 taken along line II-II. Fig. 3A is an enlarged view (a) of a main part of Fig. 2. Fig. 3B is a view of Fig. 3A just before the electricity storage device is accommodated in the accommodation section. Fig. 4 is a perspective view of an example of a holder. Fig. 5A is a plan view of the holder in Fig. 4, Fig. 5B is a partial cross-sectional view taken along line AA in Fig. 4, and Fig. 5C is a cross-sectional view taken along line BB in Fig. 4.

[0035] 1 and 2, a plurality of cylindrical energy storage devices 200 are positioned by a holder 300 and arranged side by side such that the first end faces 201 of each of the cylindrical energy storage devices 200 face the same direction. Note that, although the cylindrical energy storage devices 200 are arranged in a staggered manner in Figs. 1 and 2, the shape, arrangement, direction, number, etc. of the energy storage devices are not particularly limited.

[0036] The holder 300 has a plurality of accommodation sections 302 that respectively accommodate a plurality of power storage devices 200. Each of the plurality of accommodation sections 302 has a through hole 302h that extends in the axial direction of the power storage device 200, and one power storage device 200 is inserted into each of the through holes 302h.

[0037] The power storage device 200 has an outer peripheral surface 200S, a first end face 201 disposed at one end of the outer peripheral surface 200S, and a second end face 202 disposed at the other end of the outer peripheral surface 200S. An inner peripheral surface 300S of the accommodating portion 302 faces the outer peripheral surface 200S of the power storage device 200. An annular seal member 301 that presses the outer peripheral surface 200S is provided on the inner peripheral surface 300S of the accommodating portion 302.

[0038] The inner diameter of the accommodation portion 302 is formed slightly larger than the outer diameter of the electricity storage device 200. That is, a gap exists between the electricity storage device 200 and the holder 300. Of the gap, a sealed space S defined by an inner circumferential surface 300S of the accommodation portion 302, an outer circumferential surface 200S of the electricity storage device 200, and the seal member 301 is filled with a resin member 400. The resin member 400 bonds and fixes the electricity storage device 200 to the holder 300.

[0039] The power storage device 200 includes a case 210 having an outer peripheral surface 200S, an electrode body 200G accommodated in the case 210, and a sealing member 230 that seals the opening of the case. The case 210 has a cylindrical portion 211, an open end 212 provided at one end of the cylindrical portion 211, and a bottom portion 213 (see FIG. 2) that closes the other end of the cylindrical portion 211. The outer diameter of the cylindrical portion 211 and the outer diameter of the open end 212 of the case 210 are approximately the same. An annular groove portion 210G is formed at the boundary between the open end 212 and the cylindrical portion 211.

[0040] 3A shows a plate-shaped current collecting member 500 that electrically connects a plurality of electricity storage devices 200, and an insulating plate 600 that is interposed between the current collecting member 500 and an end face 300T of the housing portion 302 of the holder 300. The insulating plate 600 has an opening hole that corresponds to the first end face 201. The sealing member 230 has a lead member 231 that contacts the current collecting member 500 through the opening hole. The lead member 231 is electrically connected to the current collecting member 500 by a technique such as welding.

[0041] 3A, the height of the holder 300 is only slightly higher than the height of the power storage device 200. In the illustrated example, the height of the through hole 302h of the accommodation section 302 is slightly smaller than the height of the power storage device 200, and the peripheral portion of the first end face 201 of the power storage device 200 slightly protrudes from the end face 300T of the accommodation section 302. Such a compact structure is achieved by the holder 300 not having a member covering the peripheral portion of the first end face 201 of the power storage device 200 or a member covering the peripheral portion of the second end face 202. The height of the power storage module 100 is only slightly larger than the power storage device 200, and a high energy density is easily achieved.

[0042] As shown in FIG. 5B and FIG. 5C, the inner diameter of the openings 302M at both ends of the through hole 302h is the same as the inner diameter of the other parts of the through hole 301h. That is, the holder 300 does not have a member covering the peripheral portion of the first end face 201 of the power storage device 200 or a member covering the peripheral portion of the second end face 202. Therefore, the power storage device 200 having an outer diameter slightly smaller than the inner diameter of the through hole 302h can be easily inserted into the accommodation portion 302 from the openings 302M of the through hole 302h. As a result, when viewed from the first end face 201 side in the axial direction (first direction) of the power storage device 200, the entire peripheral portion of the first end face 201 is exposed from the holder 300, and when viewed from the second end face 202 side in the first direction, the entire peripheral portion of the second end face 202 is exposed from the holder 300.

[0043] The seal member 301 is located near the groove portion 210G of the case 210, and presses the boundary portion between the opening end 212 and the groove portion 210G. As a result, a sealed space S is defined by an inner circumferential surface 300S of the housing portion 302, an outer circumferential surface 200S of the opening end 212 of the power storage device, and the seal member 301. The sealed space S is cylindrical and opens on the first end face 201 side. The resin member 400 is filled in the cylindrical sealed space S extending from the seal member 301 to the first end face 201.

[0044] The cross-sectional shape of the seal member 301 cut by a plane passing through the central axis of the housing portion 302 is not particularly limited. Fig. 6A to Fig. 6D show first to fourth modified examples of the holder 300, showing the variety of cross-sectional shapes of the seal member 301. The seal member 301 protruding from the inner circumferential surface 300S of the holder 300 abuts against the outer circumferential surface 200S of the electricity storage device 200, and a sealed space S is defined by the inner circumferential surface 300S, the outer circumferential surface 200S, and the seal member 301. It should be noted that the cross-sectional shape of the seal member 301 is not limited to these illustrated examples.

[0045] 7A is a conceptual cross-sectional view showing the configuration of the power storage module 100. In FIG. 7A, the resin member 400 not only fills the sealing space S, but also extends from the sealing space S through the opening 302M of the housing portion 302 to the end face 300T of the holder 300. The end face 300T of the holder 300 is covered with the resin member 400. In this case, the current collecting member 500 and the insulating plate 600 may abut against the end face 300T of the holder 300 via the resin member 400. This makes it possible to bond the current collecting member 500 and the holder.

[0046] Fig. 7B shows a first modified example of the power storage module 100 shown in Fig. 7A. In the first modified example, a plurality of sealing members 301 are provided on the inner circumferential surface 300S of the storage section 302 along the first direction. Here, four sealing members 301 having the same cross-sectional shape are provided on the inner circumferential surface 300S along the first direction, but it is not necessary that all of the plurality of sealing members 301 have the same cross-sectional shape. In addition, the number of sealing members 301 may be less than four or may be five or more.

[0047] 7C shows a second modified example of the power storage module 100 shown in FIG. 7A. In the second modified example, the seal member 301 is cylindrical and includes a part of the outer circumferential surface 200S of the power storage device 200. In an unloaded state before the power storage device 200 is accommodated in the accommodation section 302, the thickness of the seal member 301 gradually increases from the first end 201 side to the second end 202 side until it is halfway, and then gradually decreases. The power storage device 200 is inserted into the accommodation section 302 from the first end 201 side. The inner diameter of the accommodation section 302 is slightly smaller than the outer diameter of the power storage device 200 on the second end 202 side, and is slightly larger than the outer diameter of the power storage device 200 at the position where the seal member 301 has the maximum thickness.

[0048] 8 shows a third modified example of the power storage module. In the third modified example, a holder 300 has a first holder part 310 and a second holder part 320 that are connected in a first direction. The first holder part 310 has a first housing part 312 that houses a part of the power storage device 200 on the first end face 201 side, and the second holder part 320 has a second housing part 322 that houses a part of the power storage device 200 on the second end face 202 side.

[0049] A first seal member 311 is provided on an inner circumferential surface 310S of the first housing portion 312. A resin member 400 is housed in a first space S1 defined by the inner circumferential surface 310S of the first housing portion 312, the outer circumferential surface 200S of the power storage device 200, and the first seal member 311. The first space S1 is a space extending from the first seal member 311 to the first end surface 201.

[0050] A base portion 323 that supports the peripheral portion of the second end surface 202 is provided at the end of the second housing portion 322 on the second end surface 202 side. A resin member 400 is interposed between the base portion 323 of the second holder part 320 and the peripheral portion of the second end surface 202 of the power storage device 200 to bond them together. The base portion 323 is a member that covers the peripheral portion of the second end surface 202 of the power storage device 200. Therefore, when viewed from the second end surface 202 side in the first direction, the peripheral portion of the second end surface 202 is entirely shielded by the base portion 323. When the second holder part 320 having such a structure is used, the power storage device 200 can be fixed to the holder 300 by the resin member 400 even on the second end surface 202 side, so that the structural strength of the power storage module 100 is improved. In addition, when the second holder part 320 having the base portion 323 is used, the power storage module 100 is relatively easy to manufacture.

[0051] Since the inner diameter of the base portion 323 is smaller than the outer diameter of the electricity accumulation device 200, the electricity accumulation device 200 is inserted into the second holder part 320 from the first end surface 201 side, as shown in Fig. 8(a). A resin member 400 is placed in advance on the base portion 323. Next, as shown in Fig. 8(b), the portion of the electricity accumulation device 200 on the first end surface 201 side is accommodated in the first accommodation portion 312 of the first holder part 310. Thereafter, the resin member 400 is filled into the first space S1 and cured.

[0052] FIG. 9 shows a fourth modified example of the power storage module. In the fourth modified example, the holder 300 also has a first holder part 310 and a second holder part 320 that are connected in the first direction. As in the third modified example, a first seal member 311 is provided on an inner circumferential surface 310S of the first housing part 312. A resin member 400 is accommodated in a first space S1 defined by the inner circumferential surface 310S of the first housing part 312, the outer circumferential surface 200S of the power storage device 200, and the first seal member 311. A second seal member 321 is also provided on an inner circumferential surface 320S of the second housing part 322. A resin member 400 is also accommodated in a second space S2 defined by the inner circumferential surface 320S of the second housing part 322, the outer circumferential surface 200S of the power storage device 200, and the second seal member 321. The second space S2 is a space that extends from the second seal member 321 to the second end surface 202. In this case as well, the structural strength of the energy storage module 100 can be improved.

[0053] In the energy storage module 100 according to the fourth modification, first, a portion of the energy storage device 200 on the first end face 201 side is accommodated in the first accommodation portion 312 of the first holder part 310. Next, the first end face 201 is arranged vertically upward and the second end face 202 is arranged vertically downward, and the resin member 400 is filled in the first space S1 and cured.

[0054] Thereafter, the portion of the power storage device 200 on the second end face 202 side is accommodated in the second accommodation portion 322 of the second holder part 320. The direction of the power storage device 200 is also inverted, and the second end face 202 is disposed vertically upward and the first end face 201 is disposed vertically downward. Then, the resin member 400 is filled into the second space S2 and cured. In this case, the second space S2 is a space extending from the second seal member 321 to the second end face 202.

[0055] 10 shows a fifth modified example of the power storage module. In the fifth modified example, the holder 300 also has a first holder part 310 and a second holder part 320 that are connected in the first direction. As in the third modified example, a first space S1 is defined, and a resin member 400 is housed in the first space S1. In addition, a second space S2 is defined, and a resin member 400 is housed in the second space S2.

[0056] However, the second space S2 is a space extending from the second seal member 321 to the first end face 201. In this case, first, the part of the power storage device 200 on the second end face 202 side is accommodated in the second accommodation portion 322 of the second holder part 320, the first end face 201 is arranged vertically upward and the second end face 202 is arranged vertically downward, and the second space S2 is filled with a resin member and hardened. Thereafter, the part of the power storage device 200 on the first end face 201 side is accommodated in the first accommodation portion 312 of the first holder part 310, the first end face 201 is arranged vertically upward and the second end face 202 is arranged vertically downward. Then, the first space S1 is filled with a resin member 400 and hardened.

[0057] Although a cylindrical electricity storage device has been described above as an example, the present disclosure can also be used for electricity storage devices of various shapes (for example, rectangular). [Industrial Applicability]

[0058] The power storage module according to the present disclosure can be used in various power storage devices, and is particularly suitable for use as a power source for vehicles such as hybrid automobiles and electric automobiles. [Explanation of symbols]

[0059] 100: Energy storage module 200: Energy storage device 200S: Outer surface 200G: Electrode body 201: First end surface 202:Second end surface 210: Case 210G:Groove 211:Cylinder part 212: Opening edge 213: Bottom 230: Sealing member 300: Holder 300S: Inner surface 300T: End face 301: Sealing material 302: Storage unit 302h: Through hole 302M:Aperture 310: First holder part 311: First seal member 312: First storage unit 320: Second holder part 321: Second seal member 322: Second storage section 400: Resin material

Claims

1. A plurality of power storage devices; a holder having a plurality of accommodation portions for accommodating the plurality of power storage devices, the power storage device has an outer circumferential surface, a first end surface disposed at one end of the outer circumferential surface, and a second end surface disposed at the other end of the outer circumferential surface and facing the first end surface in a first direction; an inner circumferential surface of the housing portion faces the outer circumferential surface of the power storage device, and the inner circumferential surface has an annular seal member protruding in a direction perpendicular to the first direction so as to press against the outer circumferential surface; a tip end of the sealing member in a protruding direction is disposed at an arbitrary position between both ends of the accommodating portion in the first direction, a resin member is accommodated in a space defined by the inner circumferential surface of the accommodation portion, the outer circumferential surface of the electricity storage device, and the sealing member; Energy storage module.

2. The housing portion of the holder includes a through hole extending in the first direction. The energy storage module according to claim 1 .

3. When viewed from the first end surface side in the first direction, at least a part of a peripheral portion of the first end surface is exposed from the holder. The energy storage module according to claim 1 or 2.

4. When viewed from the second end face side in the first direction, at least a part of a peripheral portion of the second end face is exposed from the holder. The storage module according to any one of claims 1 to 3.

5. A plurality of the seal members are provided on the inner circumferential surface along the first direction. The storage module according to any one of claims 1 to 4.

6. The sealing member is cylindrical and includes a portion of the outer circumferential surface. The storage module according to any one of claims 1 to 4.

7. the holder has a first holder part and a second holder part connected in the first direction, the first holder part has a first housing portion that houses a portion of the power storage device on the first end surface side, the second holder part has a second housing portion that houses a portion of the power storage device on the second end surface side, a first seal member is provided as the seal member on the inner circumferential surface assigned to the first housing portion; The resin member is accommodated in a first space of the space defined by the inner circumferential surface assigned to the first accommodation portion, the outer circumferential surface of the power storage device, and the first seal member. The storage module according to any one of claims 1 to 6.

8. A second seal member is further provided as the seal member on the inner circumferential surface allocated to the second housing portion, The resin member is further accommodated in a second space of the space defined by the inner circumferential surface allocated to the second accommodation portion, the outer circumferential surface of the power storage device, and the second seal member. The power storage module according to claim 7.

9. The second space extends from the second seal member to the second end surface. The power storage module according to claim 8 .

10. The second space extends from the second seal member to the first end surface. The power storage module according to claim 8 .

11. The power storage device further includes a plate-shaped current collecting member that electrically connects the plurality of power storage devices, An opening of the accommodation portion is provided on an end surface of the holder, the resin member extends from the space through an opening of the accommodation portion to an end surface of the holder, the current collecting member abuts against the end surface of the holder via the resin member; The storage module according to any one of claims 1 to 10.

12. the electricity storage device comprises a case having an opening, an electrode body housed in the case and including a first electrode and a second electrode, and a sealing member that seals the opening of the case; the case has a cylindrical portion, an open end portion corresponding to the opening formed at one end of the cylindrical portion, and a bottom portion closing the other end of the cylindrical portion; the first end surface includes an outer surface of the sealing member, The second end surface includes an outer surface of the bottom portion. The storage module according to any one of claims 1 to 11.

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