Energy storage module

Abstract

A power storage module according to the present invention includes a plurality of power storage devices (such as secondary cells), arranged in a line, and holders comprising accommodation sections that accommodate the plurality of power storage devices. The holders including a first holder and a second holder. Each of the plurality of power storage devices comprising a first end and a second end. The first end is accommodated in the first holder, and the second end is accommodated in the second holder. Within the holders, resin is disposed in the spaces between the plurality of power storage devices and / or the spaces between the power storage devices and the holders. Gaps that are demarcated at least by the resin and the holders and that communicate with the exteriors of the holders are formed within the holders.

Description

Technical Field

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

Background Art

[0002] A power storage module including a plurality of power storage devices such as secondary batteries is used in various applications such as power tools, electric assist bicycles, electric motorcycles, hybrid electric vehicles, and further electric vehicles. As a method for holding a plurality of power storage devices in a power storage module, a method of holding while covering the outer periphery of each power storage device with a potting resin is known (Patent Document 1).

Prior Art Documents

Patent Documents

[0003]

Patent Document 1

Summary of the Invention

Problems to be Solved by the Invention

[0004] As described above, by using a potting material, a plurality of power storage devices can be held with a certain strength. However, this resin disposed around each power storage device may generate gas when overheated. At this time, if this resin together with the power storage device is housed in a sealed state in a housing such as a holder, there is a risk that the gas accumulated in the housing acts as a force to move the power storage device. In such a situation, one of the objects of the present disclosure is to provide a power storage module with excellent reliability.

Means for Solving the Problems

[0005] One aspect of the present disclosure relates to a power storage module. The power storage module is a power storage module including a plurality of power storage devices arranged in parallel and a holder having a housing portion for housing the plurality of power storage devices. The holder includes a first holder and a second holder. Each of the plurality of power storage devices includes a first end portion in a height direction perpendicular to the arrangement direction and a second end portion opposite to the first end portion. The first end portion is housed in the first holder, and the second end portion is housed in the second holder. In the holder, resin is disposed in at least one space selected from the group consisting of a space between the plurality of power storage devices and a space between the power storage device and the holder. In the holder, a gap is formed that is defined at least by the resin and the holder and communicates with the outside of the holder.

Advantages of the Invention

[0006] According to the power storage module of the present disclosure, it is possible to suppress the resin from being sealed in the holder. Therefore, the gas generated in the holder is easily exhausted, and the reliability of the power storage module is enhanced.

Brief Description of the Drawings

[0007]

Figure 1

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Figure 6

Embodiments for Carrying Out the Invention

[0008] Hereinafter, embodiments of the present disclosure will be described. In the following description, embodiments of the present disclosure will be described with examples, but the present disclosure is not limited to the examples described below. In the following description, specific numerical values and materials may be exemplified, but other numerical values and other materials may be applied as long as the effects of the present disclosure can be obtained.

[0009] (Power storage module) The power storage module of the present disclosure includes a plurality of power storage devices arranged in parallel and a holder having a housing portion for housing the plurality of power storage devices. The holder includes a first holder and a second holder. Each of the plurality of power storage devices includes a first end portion in a height direction perpendicular to the arrangement direction and a second end portion on the side opposite to the first end portion. The first end portion is housed in the first holder, and the second end portion is housed in the second holder. In the holder, resin is disposed in at least one space selected from the group consisting of the space between the plurality of power storage devices and the space between the power storage device and the holder. This resin (resin portion) may be hereinafter referred to as "resin (R)". In the holder, there is formed a gap that is defined at least by the resin (R) and the holder and communicates with the outside of the holder. This gap may be hereinafter referred to as "gap (G)".

[0010] In the power storage module of the present disclosure, resin (R) is disposed in at least one space selected from the group consisting of the space between the plurality of power storage devices and the space between the power storage device and the holder. Therefore, it functions to fix the power storage device together with the holder.

[0011] The gap (G) communicates with the outside of the holder. Therefore, even when gas is released into the gap (G) due to decomposition of the resin or additives contained in the resin from the overheated resin (R) when the battery is in an overheated state, the gas is released to the outside of the holder. Therefore, it is possible to suppress problems such as an increase in the pressure inside the holder and movement of the battery.

[0012] Also, compared with the case where the space between the first holder and the second holder is entirely filled with resin (R), providing a gap (G) can reduce the amount of resin (R). As a result, it is possible to reduce the weight of the power storage module. Furthermore, by reducing the amount of resin (R), the process of arranging the resin (R) in the space between the power storage devices or in the space between the holder and the power storage device also becomes easier. For example, the time and cost of arranging the resin (R) can be reduced.

[0013] The orientations of the plurality of power storage devices may all be the same or different. For example, when the power storage device is a secondary battery having a positive electrode terminal at one end, the ends on the positive electrode terminal side of all the secondary batteries may be accommodated in the first holder, or the ends on the positive electrode terminal side of all the secondary batteries may be accommodated in the second holder. Alternatively, a part of the ends on the positive electrode terminal side of all the secondary batteries may be accommodated in the first holder, and the remaining ends on the positive electrode terminal side may be accommodated in the second holder.

[0014] In the holder, resin (R) is disposed in at least one of the space between the plurality of power storage devices and the space between the power storage device and the holder. The resin (R) may be disposed in the space between the plurality of power storage devices, may be disposed in the space between the power storage device and the holder, or may be disposed in both of these two spaces. Note that "resin (R) is disposed in the space" means that resin (R) is disposed in at least a part of the space, and it is not necessary that the entire space is filled with resin (R).

[0015] The power storage device is not particularly limited, and any secondary battery, capacitor, etc. can be used. For example, a known non-aqueous electrolyte secondary battery (such as a known lithium-ion secondary battery, a known lithium battery, etc.) or a known nickel-metal hydride secondary battery may be used. As the capacitor, an electric double layer capacitor using activated carbon as the electrode material, a lithium-ion capacitor, etc. can also be used. The negative electrode of an example of a lithium-ion secondary battery contains a substance that reversibly occludes and releases lithium ions as the negative electrode active material. The negative electrode of an example of a lithium secondary battery is an electrode on which lithium metal is deposited during charging and the deposited lithium metal is released during discharging. The positive electrode of those secondary batteries may contain a composite oxide containing lithium, etc. as the positive electrode active material.

[0016] The plurality of power storage devices are each arranged such that the longitudinal direction is along one direction. In other words, the longitudinal directions of the plurality of power storage devices are parallel to each other (including the case where they are substantially parallel). Here, the longitudinal direction is a direction parallel to the central axis of the cylindrical portion (for example, a cylindrical portion) of the exterior body of the power storage device. In a typical example, the plurality of power storage devices are arranged such that the first ends of the plurality of power storage devices are arranged on a virtual single plane. The two ends existing on the opposite sides along the longitudinal direction of the power storage device are respectively accommodated in the first holder and the second holder.

[0017] The first and second holders are usually formed using an insulating resin or the like. As the insulating resin, a resin that has been used as the material for the holder of a conventional power storage module may be used. For example, a thermosetting resin or a thermoplastic resin. Examples of the insulating resin include polycarbonate and the like. The first and second holders can be formed, for example, by injection molding. Incidentally, the holder may be made of metal as long as insulation from the power storage device can be maintained.

[0018] The first holder may have a first accommodating portion in which the first end of the power storage device is accommodated, and the second holder may have a second accommodating portion in which the second end of the power storage device is accommodated. The first holder usually has a plate-shaped portion having the first accommodating portion, and the first end of the power storage device is accommodated in the first accommodating portion. Similarly, the second holder usually has a plate-shaped portion having the first accommodating portion, and the second end of the power storage device is accommodated in the second accommodating portion. For example, the first and second ends are inserted and held in recesses (such as holes), which are accommodating portions formed in the plate-shaped portions of the first and second holders.

[0019] For the resin (R) disposed in the space between the plurality of power storage devices or the space between the power storage device and the holder, for example, a resin that can be filled in those spaces and cures after filling can be used. The resin (R) may be a resin that cures by mixing two components. Examples of the resin (R) include urethane resins (polyurethanes), epoxy resins, and silicone resins. A urethane resin is obtained by mixing a polyol component (first material) and a polyisocyanate component (second material). Immediately after these components are mixed, they are in a liquid state, but as time passes, the reaction proceeds and a cured urethane resin is obtained. The urethane resin can be imparted with various properties (thermal conductivity, heat absorption (flame retardancy), insulation, etc.) by selecting the components used as raw materials and adding additives. Therefore, the urethane resin can be used as the resin (R). As the resin (R), a known two-component mixed type resin may be used. For example, as the resin (R), a known urethane resin (two-component mixed type urethane resin) used for sealing a substrate or the like may be used. Some of these resins are sometimes called potting resins.

[0020] Generally, the resin (R) is in contact with the inner surface of the first holder. In other words, generally, the resin (R) is accommodated in the first holder. A part of this resin (R) may be in contact with the second holder. Alternatively, the resin (R) may be arranged so as not to be in contact with the second holder. When the resin (R) is also accommodated in (in contact with) the second holder, the amount of the resin (R) accommodated in the first holder may be more than the amount of the resin (R) accommodated in the second holder. Alternatively, the ratio of the gap between the first holder and the power storage device occupied by the resin (R) may be higher than the ratio of the gap between the second holder and the power storage device occupied by the resin (R). By arranging the resin (R) in this way, the amount of the resin (R) can be particularly reduced. Furthermore, according to this configuration, when gas is released from the resin (R), the gas can be quickly released to the outside of the holder.

[0021] The area of the surface of the side of the power storage device that is in contact with the resin (R) may be in the range of 50 to 100% (for example, in the range of 70 to 100% or in the range of 80 to 100%) of the area of the side of the secondary battery. Also, the upper limit of these ranges may be 98% or less or 95% or less.

[0022] Each of the plurality of power storage devices may include a bottomed cylindrical outer package. The outer package may have a ring-shaped groove formed on one end side (for example, the first end side). An example of the power storage device in this case is a cylindrical secondary battery. Examples of such cylindrical secondary batteries include cylindrical lithium-ion secondary batteries, cylindrical lithium secondary batteries, and cylindrical nickel-metal hydride secondary batteries.

[0023] In the power storage module of the present disclosure, the resin (R) may be in contact with the first holder, and each of the plurality of power storage devices may include a bottomed cylindrical exterior body. The exterior body may have an annular groove formed on the first end side. That is, the groove may be formed at a position closer to the first end than the second end. An electrode group including a positive electrode and a negative electrode is disposed in the exterior body. In the power storage device, a groove may be formed in the exterior body. The groove is usually formed for purposes such as disposing a sealing body to seal the opening of the exterior body. In such a power storage device, the sealing body is electrically connected to one of the electrodes in the electrode group and functions as a terminal (for example, a positive electrode terminal), and the exterior body is electrically connected to the other electrode in the electrode group and functions as a terminal (for example, a negative electrode terminal). The sealing body including the positive electrode terminal is usually provided with a mechanism for releasing the gas inside the battery when the internal pressure of the battery rises. A known mechanism that has been conventionally used may be applied to the mechanism.

[0024] The plurality of power storage devices may be arranged in a staggered pattern or in another arrangement method. By arranging them in a staggered pattern, it is possible to increase the number of batteries per unit volume. An example of the staggered arrangement will be described later. Usually, the plurality of power storage devices are arranged so as not to contact each other.

[0025] The holder may have a through hole, and the gap (G) may communicate with the outside of the holder through the through hole. The through hole may be formed in at least one part selected from the first holder, the second holder, and between the first holder and the second holder. In one example, the through hole is formed between the first holder and the second holder.

[0026] The first holder may include an outer wall arranged to surround a plurality of power storage devices. And the through-hole of the holder may be formed in at least one part selected from between the first holder and the second holder and the group consisting of the outer walls. In this case, the first holder may include a plate-like portion (flat plate-like portion) and an outer wall extending from the peripheral edge of the plate-like portion. On the upper and lower surfaces of the holder, there are a sealing body used for leading out electrodes and the bottom of an exterior body used for cooling. Since the side surface of the holder has a lower possibility of being covered by other members compared to the upper and lower surfaces of such a holder, gas can be vented more efficiently.

[0027] Various other components (such as additives) may be added to the resin (R) as necessary. For example, the resin (R) may include particles containing an inorganic substance that decomposes by an endothermic reaction. Examples of such inorganic substances include aluminum hydroxide and magnesium hydroxide. Examples of such particles containing an inorganic substance include an inorganic filler made of aluminum hydroxide and an inorganic filler made of magnesium hydroxide. By using the resin (R) containing these inorganic substances, when the battery is in an overheated state, the temperature rise of the battery can be effectively suppressed.

[0028] The module of the present disclosure includes other components as necessary. For example, the module of the present disclosure usually includes a conductive member for the positive electrode and a conductive member for the negative electrode, which are respectively connected to the positive electrode terminal and the negative electrode terminal for charging and discharging. The conductive member for the positive electrode and the conductive member for the negative electrode may be arranged on different sides or on the same side. For example, when the positive electrode terminal is arranged on the first holder side, the conductive member for the positive electrode may be arranged on the first holder side and the conductive member for the negative electrode may be arranged on the second holder side. Alternatively, when the positive electrode terminal is arranged on the first holder side, both the conductive member for the positive electrode and the conductive member for the negative electrode may be arranged on the first holder side. Alternatively, when a part of the plurality of positive electrode terminals is arranged on the first holder side and the remaining positive electrode terminals are arranged on the second holder side, both the conductive member for the positive electrode and the conductive member for the negative electrode may be arranged on the first holder side and the second holder side. Since these arrangement methods and the conductive members used therein have been conventionally proposed, they may be used.

[0029] The module of the present disclosure usually includes an outer case for housing the holder. Usually, a through hole communicating with the outside of the outer case is formed in the outer case. The gap (G) between the resin (R) and the second holder (the gap communicating with the outside of the holder) can be communicated with the outside of the outer case through the through hole of the outer case.

[0030] Usually, there is a space between the outer case and the plate-like portion of the first holder. The above-mentioned conductive member can be arranged in this space. Since this space usually communicates with the outside of the outer case, when the internal pressure of the battery rises and gas is released from the battery, the gas can be released to the outside of the outer case through this space.

[0031] Hereinafter, an example of the power storage module of the present disclosure will be specifically described with reference to the drawings. The components of the example of the power storage module described below can apply the above-described components. Further, the components of the example of the power storage module described below can be changed based on the above description. Further, the matters described below may be applied to the above-described embodiments. In the following drawings, the illustration of reference numerals may be omitted for ease of viewing the drawings.

[0032] Hereinafter, as an example, a power storage module including a battery pack composed of a plurality of cylindrical secondary batteries and a holder that holds the plurality of secondary batteries will be described. This example of the power storage module has the following configuration. That is, the holder includes a first holder having a first accommodating portion and a second holder having a second accommodating portion. Each of the plurality of secondary batteries includes a first end portion and a second end portion opposite to the first end portion. The first end portion is accommodated in the first accommodating portion, and the second end portion is accommodated in the second accommodating portion. A resin (R) is disposed in the space between the plurality of secondary batteries. There is a gap (G) communicating with the outside of the holder between the resin (R) and the second holder.

[0033] (Embodiment 1) A perspective view of the main part of the power storage module 100 of Embodiment 1 is shown in FIG. 1. The power storage module 100 includes, as an example of a plurality of power storage devices, a battery pack 10G including a plurality of aligned secondary batteries 10 and a holder 110 that houses the secondary batteries 10. The holder 110 includes a first holder 111 and a second holder 112. A view of the battery pack 10G and the second holder 112 as seen from the first holder 111 side is shown in FIG. 2. A perspective view of the first holder 111 as seen from the second holder 112 side is shown in FIG. 3. A perspective view of the second holder 112 as seen from the first holder 111 side is shown in FIG. 4. A partial cross-sectional view of the secondary battery 10 is shown in FIG. 5. A cross-sectional view taken along line VI-VI in FIG. 1 is shown in FIG. 6. Note that the power storage module 100 includes an outer case that houses the holder 110 and a conductive member connected to the positive and negative terminals of the secondary battery 10, but illustration thereof is omitted.

[0034] As will be described later, each of the plurality of secondary batteries 10 includes a first end portion 10a and a second end portion 10b opposite to the first end portion 10a. The first end portion 10a is accommodated (held) in the first holder 111, and the second end portion 10b is accommodated (held) in the second holder 112. The first holder 111 and the second holder 112 are fixed to each other by bolts or the like passing through the through-hole 111b and a through-hole 112b described later. Note that the through-holes 111b and 112b are fixed at the peripheral portion of the holder in the arrangement direction of the battery pack 10G, but the present invention is not limited to this configuration, and they may be fixed at the central portion of the holder. With this configuration, the opening area of the through-hole 110h can be further increased.

[0035] Referring to FIG. 1, a through-hole 110h is formed in the outer wall of the holder 110. The through-hole 110h is formed between the first holder 111 and the second holder 112.

[0036] In the first holder 111, through-holes 111h are formed such that the first end portion 10a sides of the plurality of secondary batteries 10 are exposed. In an example shown in FIG. 1, a positive electrode terminal 50a exists on the first end portion 10a side of the secondary battery 10.

[0037] Referring to FIG. 2, the plurality of secondary batteries 10 are arranged in a staggered pattern. Specifically, a plurality of rows each including a plurality of secondary batteries 10 are arranged such that they are arranged along a column direction perpendicular to the row. In each row, the plurality of secondary batteries 10 are arranged at substantially equal intervals along the row direction. In two adjacent rows, the positions of the secondary batteries 10 are shifted along the row direction. In two rows adjacent to each other with one row in between, the positions of the secondary batteries 10 in the row direction are the same. In one example, the staggered arrangement means an arrangement in which hexagons of the same shape are arranged so as to fill a plane without gaps, and the secondary batteries 10 are placed at the vertices of the hexagons and at the center of the hexagons. As shown in FIG. 2, there is a space between the plurality of secondary batteries 10. Also, the plurality of secondary batteries 10 are arranged so as not to contact each other.

[0038] Referring to FIG. 3, the first holder 111 includes a flat plate-like portion 111p and an outer wall (side wall) 111s extending from the peripheral edge of the plate-like portion 111p. As shown in FIG. 1, the battery pack 10G is surrounded by the outer wall 111s. A notch 111k is formed in the outer wall 111s over substantially the entire circumference. This notch 111k becomes the through hole 110h shown in FIG. 1.

[0039] A plurality of recesses (first accommodating portions) 111c arranged in a staggered pattern are formed in the plate-like portion 111p. A through hole (the through hole 111h shown in FIG. 1) is formed in the central portion of the recess 111c. The first end 10a of the secondary battery 10 is accommodated in the recess 111c, and the first end 10a is held by the first holder 111.

[0040] Referring to FIG. 4, the second holder 112 includes a flat plate-like portion 112p. A plurality of recesses (second accommodating portions) 112c arranged in a staggered pattern are formed in the second holder 112 (the plate-like portion 112p). A through hole (the through hole 112h in FIG. 6) is formed in the central portion of the recess 112c. The second end 10b of the secondary battery 10 is accommodated in the recess 112c, and the second end 10b is held by the second holder 112. Note that a through hole 112b for fixing is formed in the second holder 112.

[0041] Referring to FIG. 5, the plurality of cylindrical secondary batteries 10 include a first end 10a and a second end 10b opposite to the first end 10a. The first end 10a and the second end 10b are two ends along the longitudinal direction LD of the secondary battery 10. Note that the orientation of the batteries (for example, which direction the sealing body faces) at the ends of these plurality of secondary batteries 10 may be the same or different among individual batteries. The longitudinal direction LD is the height direction of the secondary battery 10. In the power storage module 100, the longitudinal direction LD is a direction perpendicular to the direction in which the plurality of secondary batteries 10 are arranged.

[0042] Here, as an example, the case where the secondary battery 10 is a lithium-ion secondary battery will be described. There are no particular limitations on the components of the secondary battery 10 described below, and known components may be applied. The secondary battery 10 includes a wound electrode group 20 and a non-aqueous electrolyte (not shown). The electrode group 20 includes a strip-shaped positive electrode 21, a strip-shaped negative electrode 22, and a separator 23. A separator 23 is disposed between the positive electrode 21 and the negative electrode 22. A positive electrode lead 21a is connected to the positive electrode 21. A negative electrode lead 22a is connected to the negative electrode 22. The positive electrode 21 includes a positive electrode current collector and a positive electrode active material layer disposed on the positive electrode current collector. The negative electrode 22 includes a negative electrode current collector and a negative electrode active material layer disposed on the negative electrode current collector.

[0043] One end of the positive electrode lead 21a is connected to the positive electrode 21, and the other end is connected to the sealing body 50. The sealing body 50 includes a positive electrode terminal 50a. Usually, the sealing body 50 includes a mechanism that operates as a safety valve when the internal pressure of the battery rises.

[0044] One end of the negative electrode lead 22a is connected to the negative electrode 22, and the other end is connected to the bottom of the exterior body 60. The exterior body 60 functions as a negative electrode terminal. The exterior body 60 is a bottomed cylindrical can. The exterior body 60 has a ring-shaped groove portion 60c formed on the first end portion 10a side.

[0045] An upper insulating ring 81 and a lower insulating ring 82 made of resin are disposed on each of the upper and lower portions of the electrode group 20. The exterior body 60 is sealed by the sealing body 50 and the gasket 70. The exterior body 60, the sealing body 50, and the gasket 70 constitute a battery case, and the electrode group 20 and the non-aqueous electrolyte are disposed in the battery case.

[0046] FIG. 6 is a cross-sectional view taken along line VI-VI of FIG. 1. For ease of understanding, the illustration of the secondary battery 10 at the right end is omitted. Also, in FIG. 6, the illustration of the groove portion 60c of the secondary battery 10 is omitted.

[0047] A through-hole 110h is formed between a first holder 111 and a second holder 112. The first holder 111 (plate-like portion 111p) has a recess 111c and a through-hole 111h formed at the center of the recess 111c. The second holder 112 (plate-like portion 112p) has a recess 112c and a through-hole 112h formed at the center of the recess 112c. A conductive member for charging and discharging is connected to the electrode terminal through the through-hole 111h (or through-holes 111h and 112h).

[0048] A first end portion 10a of the secondary battery 10 is disposed in the recess 111c, and a second end portion 10b of the secondary battery 10 is disposed in the recess 112c. Usually, the portions where the first holder 111 is in contact with the secondary battery 10 and where the second holder 112 is in contact with the secondary battery are fixed with an adhesive or the like.

[0049] A resin 150 is filled (disposed) in the space between the plurality of secondary batteries 10. The resin 150 that holds the secondary battery 10 together with the holder 110 is in contact with the first holder 111 (the inner surface of the first holder 111). On the other hand, the resin 150 is not in contact with the second holder 112. A gap G exists between the resin 150 and the second holder 112. The gap G communicates with the space outside the holder 110 through the through-hole 110h. The gap G is defined by at least the resin 150 and the holder 110.

[0050] There is no particular limitation on the direction in which the power storage module 100 is disposed when using the power storage module. For example, the power storage module 100 may be used with the second holder 112 disposed downward and the first holder 111 disposed upward. That is, the power storage module 100 may be disposed and used such that the longitudinal direction LD of the secondary battery 10 is along the vertical direction. Alternatively, the power storage module 100 may be disposed and used such that the longitudinal direction LD of the secondary battery 10 is inclined with respect to the vertical direction. For example, the power storage module 100 may be disposed and used such that the longitudinal direction LD of the secondary battery 10 is along the horizontal direction.

[0051] The power storage module 100 has a gap G that communicates with the outside of the holder 110. Therefore, even when gas is released from the resin 150 due to heat generation of the secondary battery 10 or the like, the gas can be released to the outside of the holder 110 through the gap G. Further, since the gap G is not filled with the resin 150, the weight of the power storage module 100 can be reduced as compared with a power storage module in which the entire secondary battery 10 is covered with the resin 150.

[0052] When the gap G does not exist, the amount of the resin 150 is large, so the power storage module becomes heavy. Further, when the secondary battery 10 is in an overheated state and gas is released from the resin 150, there is no route for the gas to escape to the outside of the holder. Therefore, the pressure inside the holder increases, and deformation of the holder or movement of the secondary battery 10 may occur. According to the present disclosure, the possibility of these problems occurring can be reduced.

[0053] (Method for manufacturing the power storage module 100) The method for manufacturing the power storage module of the present disclosure is not particularly limited. An example of the method for manufacturing the power storage module 100 will be described below. First, members necessary for manufacturing the power storage module 100 are prepared. The first and second holders 111 and 112 can be formed, for example, by injection molding a resin as a material. Next, the first holder 111 is placed so that the plate-like portion 111p of the first holder 111 faces downward. Next, the first end portion 10a of the secondary battery 10 is inserted into the recess 111c of the first holder 111. At this time, the first holder 111 and the first end portion 10a are fixed with an adhesive or the like. Next, the space between the plurality of secondary batteries 10 is filled with the resin 150 before curing. At this time, the resin 150 before curing is filled up to a position that does not exceed the notch portion 111k (see FIG. 3) of the first holder 111.

[0054] As compared with the case where the entire space between the first holder 111 and the second holder 112 is filled with the resin 150, in the power storage module 100, the filling depth of the resin 150 is shallow and the filling amount of the resin 150 is small. Therefore, the filling of the resin 150 is easy.

[0055] After the resin 150 is cured, the first holder 111 and the second holder 112 are combined and fixed to obtain the holder 110. At this time, the second end 10b of the secondary battery 10 is inserted into the recess 112c of the second holder 112. Then, the second holder 112 and the second end 10b are fixed with an adhesive or the like. Next, a conductive member for charging and discharging is connected to the electrode terminal. Further, the holder 110 in which the conductive member is disposed is fixed to the outer case, and wiring or the like is performed as necessary. In this way, the power storage module 100 is obtained.

Industrial Applicability

[0056] The present disclosure can be used for a power storage module.

Explanation of Signs

[0057] 10 Secondary battery (power storage device) 10a First end 10b Second end 10G Battery pack 60 Outer body 60c Groove portion 100 Power storage module 110 Holder 111 First holder 111c Recess (first accommodation portion) 111h Through hole 111s Outer wall 112 Second holder 112c Recess (second accommodation portion) 150 Resin G Gap

Claims

1. A power storage module including a plurality of aligned power storage devices and a holder having a housing portion for housing the plurality of power storage devices, wherein the holder includes a first holder and a second holder, each of the plurality of power storage devices includes a first end portion in a height direction perpendicular to the alignment direction and a second end portion opposite to the first end portion, the first end portion is housed in the first holder, and the second end portion is housed in the second holder, in the first holder, resin is disposed in at least one space selected from the group consisting of a space between the plurality of power storage devices and a space between the power storage device and the first holder, in the holder, a gap is formed that is defined at least between the resin and the second holder in the height direction and communicates with the outside of the holder, the holder has a through hole, the gap communicates with the outside of the holder through the through hole, the first holder includes an outer wall disposed so as to surround the plurality of power storage devices, the through hole is formed in at least one portion selected from the group consisting of between the first holder and the second holder and the outer wall, the resin contains particles containing an inorganic substance that decomposes by an endothermic reaction, the power storage module.

2. The power storage module according to claim 1, wherein the resin is in contact with the inner surface of the first holder.

3. The power storage module according to claim 1 or 2, wherein the resin is disposed so as not to be in contact with the second holder.

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