JP2016046043A - Power storage module - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage module capable of suppressing leakage of gas from a passage of gas, even when a passage of gas discharged from the open valve of a power storage device is provided.SOLUTION: A battery module 10 includes a pair of extensions arranged to face each other across an open valve, and extending in one direction, a cover member 60 provided via an extension for the upper surface, so as to face the upper surface of a lid, i.e., the surface provided with the open valve in the case, and a coating part for coating the cover and extension in a space surrounded by the extension and the upper surface of a lid and the cover member and extending in one direction. A passage 81 of gas discharged from the open valve is formed, by a space surrounded by the coating part and the installation surface and extending in one direction.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a power storage module having a passage for discharging gas discharged from a power storage device.

  A power storage device housed in an electrode assembly case composed of a positive electrode and a negative electrode is known. In such a power storage device, an open valve is provided that reduces the internal pressure of the case by discharging gas from the inside of the case to the outside of the case when the internal pressure of the case exceeds a specified pressure.

  For example, Patent Document 1 discloses a power storage module having a power storage device provided with such an open valve. The power storage module (battery module) described in Patent Document 1 includes a cover that extends along the parallel arrangement direction of the power storage devices (battery cells) and covers a plurality of release valves (discharge holes) from above. The gas discharged from the open valve of the power storage device is discharged through a passage formed from a space surrounded by the upper surface of the power storage module and the cover.

JP 2012-89499 A

  By the way, when the cover is deformed due to repeated expansion and contraction due to environmental temperature, a gap is formed between the power storage module and the cover, and there is a possibility that gas leaks from the gap. These gases may affect surrounding electronic components. For this reason, when the channel | path which distribute | circulates the gas discharged | emitted from an open valve is provided, it is desired to suppress that a gas leaks from the said channel | path.

  Therefore, the present invention provides a power storage module that can suppress the leakage of gas from the flow path even when a gas flow path discharged from an open valve of the power storage device is provided. Objective.

  The power storage module according to the present invention includes an electrode assembly having a positive electrode and a negative electrode, a case that houses the electrode assembly, and an open valve that discharges gas inside the case to the outside of the case. The storage modules are arranged side by side and are arranged so as to face each other across the release valve, facing a pair of extending portions extending in one direction and an installation surface which is a surface on which the release valve is provided in the case The cover portion provided on the installation surface via the extension portion, and the covering covering the cover portion and the extension portion in a space extending in one direction surrounded by the extension portion, the installation surface, and the cover portion A flow path for gas discharged from the open valve is formed by a space extending in one direction surrounded by the covering portion and the installation surface.

  In the power storage module having this configuration, the cover portion and the extending portion are covered with the covering portion in a space extending in one direction formed by being surrounded by the extending portion and the cover portion. Thereby, the heat from the high-temperature gas flowing through the flow passage is hardly transmitted to the cover portion and the extension portion, and the generation of a gap in the flow passage due to the thermal deformation of the cover portion and the extension portion is suppressed. As a result, gas can be prevented from leaking from the flow path.

  In the power storage module of the present invention, the cover portion and the extending portion may be formed of a resin, and the covering portion may be formed of a heat resistant material.

  In the electricity storage module having this configuration, the covering portion, which is a portion that is in direct contact with the gas flowing through the flow passage, is formed of a heat-resistant material. Therefore, the extending portion and the cover portion that are portions that are not in direct contact with the gas flowing through the flow passage Can be formed of a less expensive resin than a heat resistant material without using a heat resistant material. Thereby, an electrical storage module can be manufactured at low cost.

  In the electricity storage module of the present invention, the covering portion may be made of metal.

  According to the power storage module having this configuration, since the flow path is covered with the metal having high heat conductivity, it is possible to radiate heat to the outside of the flow path, and the temperature rise of the cover portion can be suppressed.

  In the electricity storage module of the present invention, the covering portion may be provided with a heat radiating portion.

  According to the electricity storage module having this configuration, heat is radiated from the covering portion, so that an increase in the temperature of the covering portion can be suppressed. Thereby, it becomes difficult to transmit heat to a cover part and an extending part via a coating | coated part, and the temperature rise of a cover part and an extending part can be suppressed.

  In the power storage module of the present invention, a pair of end plates that pressurize and restrain the plurality of power storage devices are disposed at both ends in one direction of the plurality of power storage devices arranged in parallel in one direction, and the end plates are made of metal. Once formed, the covering may be connected to the end plate.

  In the power storage module having this configuration, a pair of end plates that pressurize and restrain a plurality of power storage devices are used as a heat radiating unit. Thereby, since the end plate which is a member with a large heat capacity can be used as a heat radiating part, the temperature rise of the cover member can be efficiently suppressed.

  In the electricity storage module of the present invention, an air layer may be formed between at least one of the covering portion and the cover portion and between the covering portion and the extending portion.

  According to the power storage module having this configuration, since the thermal conductivity between the covering portion and the cover portion and between the covering portion and the extending portion is reduced, the temperature rise of the cover portion and the extending portion is further suppressed. be able to.

  In the power storage module of the present invention, a heat insulating material may be disposed between at least one of the covering portion and the cover portion and between the covering portion and the extending portion.

  According to the power storage module having this configuration, since the thermal conductivity between the covering portion and the cover portion and between the covering portion and the extending portion is reduced, the temperature rise of the cover portion and the extending portion is further suppressed. be able to.

  According to this invention, even if it is a case where the channel | path for distribute | circulating the gas discharged | emitted from the open valve of an electrical storage apparatus is provided, it can suppress that gas leaks from the said channel | path.

It is a perspective view which shows the whole structure of the battery module which concerns on one Embodiment. It is sectional drawing when cut | disconnecting along the surface orthogonal to the parallel arrangement direction of the secondary battery in the battery module of FIG. It is a perspective view which shows the 1st battery holder and 2nd battery holder which are respectively shown in FIG. It is sectional drawing which shows the secondary battery contained in the battery module of FIG. It is a perspective view which shows the coating | coated member and heat dissipation part shown in FIG. It is sectional drawing which shows the structure of the flow path in the battery module which concerns on a modification. It is sectional drawing which shows the structure of the flow path in the battery module which concerns on a modification.

  Hereinafter, an embodiment will be described with reference to the drawings. In the description of the drawings, the same elements are denoted by the same reference numerals, and redundant description is omitted. The dimensional ratios in the drawings do not necessarily match those described. In the description, terms indicating directions such as “up” and “down” are convenient terms based on the state shown in the drawings. In FIG. 1, FIG. 3 (A), FIG. 3 (B) and FIG. 5, the X axis and the Y axis are set for convenience of explanation.

  A battery module (storage module) 10 according to an embodiment will be described. As shown in FIGS. 1 and 2, the battery module 10 includes a plurality of secondary batteries (power storage devices) 11 such as lithium ion secondary batteries or nickel metal hydride storage batteries. The plurality of secondary batteries 11 are juxtaposed along the X-axis direction (one direction) while being held by the first battery holder 21 or the second battery holder 41.

  End plates 12, 12 provided with metal end plates 12, 12 at both ends in the side-by-side direction (X-axis direction) of the secondary batteries 11, the first battery holder 21 and the second battery holder 41, respectively. Bolts B are inserted through. The bolt B is inserted from one end plate 12 toward the other end plate 12, and is screwed into the nut N on the other end plate 12 side. The pair of end plates 12 and 12 pressurize and restrain the plurality of secondary batteries 11. A bracket 14 is fixed to each end plate 12, 12 by a fastening portion such as a bolt. The bracket 14 is fixed to a side wall (not shown) of a housing that houses a plurality of battery modules as a battery pack.

  In the present embodiment, two types of battery holders, the first battery holder 21 and the second battery holder 41, are used. The first battery holder 21 and the second battery holder 41 are alternately arranged along one direction (X-axis direction). Hereinafter, the thickness direction of the secondary battery 11 when the first battery holder 21 and the second battery holder 41 hold the secondary battery 11 (stacking direction of the electrode assembly 52 shown in FIG. 4), the width direction (connection terminal) The directions orthogonal to the thickness direction and the width direction will be described as “X-axis direction”, “Y-axis direction”, and “height direction”, respectively.

  First, the first battery holder 21 will be described. As shown in FIG. 3A, the first battery holder 21 includes a rectangular flat plate-shaped lower surface portion 22, a first side surface portion 23, a second side surface portion 24, a third side surface portion 25, a leg portion 29, and a terminal housing. It has parts 31, 31, column members 32, 33, locking projections (fixed parts) 37, 38, and protrusions 26, 26.

  The lower surface portion 22 is a portion that covers the bottom surface of the secondary battery 11 when holding the secondary battery 11. The 1st side surface part 23 and the 2nd side surface part 24 are arrange | positioned so that it may mutually oppose at the Y-axis direction both ends of the lower surface part 22, and are extended in the height direction. The first side surface portion 23 and the second side surface portion 24 are portions that cover the side surface of the secondary battery 11 (the surface along the stacking direction of the electrode assembly 52 shown in FIG. 4) when holding the secondary battery 11. is there. The third side surface portion 25 is provided so as to connect the first side surface portion 23 and the second side surface portion 24 with the thickness direction in the X-axis direction. The position of the upper end 25 </ b> A of the third side surface portion 25 coincides with the positions 23 </ b> A and 24 </ b> A of the upper ends of the first side surface portion 23 and the second side surface portion 24. The third side surface portion 25 covers one main surface of the secondary battery 11 (a surface orthogonal to the stacking direction of the electrodes constituting the electrode assembly 52 shown in FIG. 4) when holding the secondary battery 11. It is.

  The leg portions 29 are provided at positions 23 </ b> C and 24 </ b> C of the respective lower end portions in the height direction of the first side surface portion 23 and the second side surface portion 24. The leg portion 29 is provided with an insertion hole 29A penetrating along the X-axis direction. The aforementioned bolt B is inserted through the insertion hole 29A.

  The terminal accommodating portions 31 are provided so as to be connected to the first side surface portion 23 and the second side surface portion 24 at the upper portions of both ends of the third side surface portion 25 in the Y-axis direction. The terminal accommodating portions 31 are opened in a U shape in the X-axis direction. The terminal accommodating portions 31 and 31 are portions that surround the connection terminals 55 and 55 of the secondary battery 11 when the secondary battery 11 is held.

  The column members 32 and 33 are provided adjacent to the terminal accommodating portions 31 and 31 at the upper end 25A of the third side surface portion 25, respectively. The column members 32 and 33 are quadrangular columnar column members extending in the X-axis direction, and the length thereof matches the length of the lower surface portion 22 in the X-axis direction. Each of the column members 32 and 33 is provided with insertion holes 32A and 33A penetrating along the X-axis direction. The above-described bolt B is inserted through the insertion holes 32A and 33A.

  In the first battery holder 21, the housing portion S <b> 1 in which the secondary battery 11 is housed by the space surrounded by the first side surface portion 23, the second side surface portion 24, the third side surface portion 25, and the pillar members 32 and 33 described above. Is formed.

  The locking protrusions 37 and 38 are provided at the upper ends of the column members 32 and 33, respectively. The locking protrusions 37 and 38 protrude from the column members 32 and 33 in the height direction in the direction opposite to the housing portion S1. Locking portions 36 and 36 each having a triangular prism shape are formed at the respective tips of the locking protrusions 37 and 38. The locking projection 37 provided on the column member 32 and the locking projection 38 provided on the column member 33 are provided with a slight shift in the X-axis direction.

  The protrusions 26 and 26 are provided at positions 23A and 23B at the upper ends of the first side surface portion 23 and the second side surface portion 24, respectively. The protrusions 26 and 26 are arranged to face each other and extend in the height direction. In the protrusions 26, 26, projections 27, 27 that protrude in the Y-axis direction of the protrusions 26, 26 are provided on the respective surfaces where the protrusions 26, 26 face each other.

  Next, the second battery holder 41 will be described. As shown in FIG. 3B, the second battery holder 41 has the same structure as the first battery holder 21 except that the second battery holder 41 does not have the locking protrusions 37 and 38. For this reason, the same code | symbol as the 1st battery holder 21 is attached | subjected to the same part as the 1st battery holder 21, and description is abbreviate | omitted.

  As shown in FIG. 4, the electrode assembly 52 included in the secondary battery 11 held by the first battery holder 21 or the second battery holder 41 described above is housed inside the case 51. The electrode assembly 52 has a positive electrode and a negative electrode. The case 51 includes a bottomed box-shaped main body 53 that houses the electrode assembly 52 and a plate-shaped lid 54 that closes the opening of the main body 53. Connection terminals 55 and 55 (a positive terminal and a negative terminal) are provided on the upper surface (installation surface) 54A of the lid portion 54. The lid portion 54 is provided with an opening valve 57 that is broken to release the internal pressure of the case 51 when the internal pressure of the case 51 rises to a threshold value. The “threshold value” is set such that when the internal pressure of the case 51 increases, the release valve 57 is broken before the case 51 is damaged by the internal pressure of the case 51. The connection terminals 55 and 55 are electrically connected to the electrode assembly 52 through the conductive member 58.

  As shown in FIGS. 1 and 2, the battery module 10 includes an upper surface 54 </ b> A of a lid portion 54 provided with an open valve 57 of the secondary battery 11 held by the first battery holder 21 or the second battery holder 41. It has a cover member (cover part) 60 arranged to face. For example, an electronic component that contributes to charging / discharging of the secondary battery 11, a battery ECU that controls the battery module 10, and the like are placed on the cover member 60. The cover member 60 includes a first cover member (cover portion) 61 and a second cover member (cover portion) 62 provided side by side in the direction in which the secondary batteries 11 are juxtaposed. The first cover member 61 and the second cover member 62 are made of resin.

  As shown in FIG. 1, the first cover member 61 includes a main body portion 61A, a pair of standing portions 61D and 61D, and a pair of extending portions 61E and 61E. Hereinafter, as illustrated in FIG. 1, the parallel arrangement direction of the secondary batteries 11 held by the first battery holder 21 and the second battery holder 41 is also referred to as an X-axis direction.

  The main body portion 61 </ b> A is provided so as to face the upper surface 54 </ b> A of the lid portion 54 in the secondary battery 11. The main body 61A is formed in a rectangular flat plate shape. The pair of standing portions 61D and 61D are provided at both ends in the Y-axis direction of the main body portion 61A. The pair of upright portions 61D and 61D are provided upright in the height direction in the main body portion 61A and face each other.

  The pair of extending portions 61E and 61E are provided on the surface of the main body 61A opposite to the surface on which the standing portions 61D and 61D are provided. The pair of extending portions 61 </ b> E and 61 </ b> E protrudes downward in the height direction from the main body portion 61 </ b> A, and are disposed so as to face each other with the open valve 57 of the secondary battery 11 interposed therebetween. Further, the pair of extending portions 61E and 61E extend over the entire X-axis direction (one direction) of the main body portion 61A. The pair of extending portions 61 </ b> E and 61 </ b> E protrude from the main body portion 61 </ b> A to the lid portion 54 side of the secondary battery 11 and are in contact with the upper surface 54 </ b> A of the lid portion 54. In other words, the main body 61A is provided on the upper surface 54A of the lid 54 via the extending portions 61E and 61E.

  In the main body portion 61A of the first cover member 61, four through holes 71A, 71A, 71B, 71B penetrating in the thickness direction of the main body portion 61A are formed. Each of the pair of through holes 71A and 71A and the through holes 71B and 71B provided so as to face each other in the Y-axis direction is slightly shifted in the X-axis direction in the main body portion 61A. The displacement widths of the pair of through holes 71A and 71A and the through holes 71B and 71B are the same as the displacement widths of the locking projections 37 and 38 provided on the column members 32 and 33, respectively.

  As shown in FIG. 1, the second cover member 62 has the same configuration as the first cover member 61 except that the positions and the number of through holes 71C and 71C provided in the main body 62A are different. Here, the description of the same part as the first cover member 61 is omitted, and only the positions of the through holes 71C and 71C are described.

  A pair of through holes 71 </ b> C and 71 </ b> C that penetrates in the thickness direction of the main body 62 </ b> A are formed in the main body 62 </ b> A of the second cover member 62. The pair of through holes 71C and 71C provided so as to face the Y-axis direction are formed slightly shifted in the X-axis direction in the main body portion 62A. The deviation width of the pair of through holes 71C and 71C is the same as the deviation width of the locking projections 37 and 38 provided on the column members 32 and 33, respectively.

  As shown in FIG. 2, the cover member 60 includes a lid portion in which the main body portion 61 </ b> A of the first cover member 61 and the main body portion 62 </ b> A of the second cover member 62 are provided with the release valve 57 in the secondary battery 11. The upper portion 54 </ b> A of the first cover member 61 is opposed to the upper surface 54 </ b> A of the first cover member 61, and the raised portion 62 </ b> D of the second cover member 62 is disposed along the protruding portions 26 and 26.

  In the present embodiment, the main body portion 61A of the first cover member 61 and the main body portion 62A of the second cover member 62 constitute the main body portion 60A of the cover member 60, and the upright portions 61D and second portions of the first cover member 61 are provided. The standing part 62 </ b> D of the cover member 62 constitutes the standing part 60 </ b> D of the cover member 60. Therefore, hereinafter, the main body portion 61A of the first cover member 61 and the main body portion 62A of the second cover member 62 are referred to as the main body portion 60A of the cover member 60, and the standing portion 61D and the second cover member 62 of the first cover member 61 are used. The extending portion 62D of the first cover member 61 and the extending portion 62E of the second cover member 62 will be described as the extending portion 60E of the cover member 60. .

  The pair of through holes 71A, 71B, 71C are formed in the main body 60A of the cover member 60. The separation distance between the through holes 71A, 71B, 71C adjacent in the X-axis direction is the same as the separation distance between the locking protrusions 37, 38 adjacent in the X-axis direction of the first battery holder 21 that holds the secondary battery 11. It has become. The locking protrusions 37 and 38 of the first battery holder 21 are passed through the through holes 71A, 71B, and 71C, respectively. The locking projections 37 and 38 that respectively penetrate the through holes 71A, 71B, and 71C have the locking portions 36 locked to the edges (main body portion 60A) of the through holes 71A, 71B, and 71C. The standing portion 60D of the cover member 60 is disposed along the protruding portion 26 of the first battery holder 21 and the second battery holder 41, and the upper end of the standing portion 60D is a protrusion provided on the protruding portion 26. 27.

  As shown in FIGS. 1 and 2, the cover member 60 is arranged so that the surface 60B provided with the pair of extending portions 60E in the main body portion 60A faces the upper surface 54A of the lid portion 54 of the secondary battery 11. Has been. Further, the pair of extending portions 60E and 60E are disposed so as to face each other across the open valve 57 of the secondary battery 11, and extend in the X-axis direction. Thus, the cover member 60 is provided so as to face the upper surface 54A of the lid portion 54 where the release valve 57 is provided in the secondary battery 11, and a pair of extending portions 60E and 60E are provided on the upper surface 54A. Will be provided.

  The space extending in the X-axis direction surrounded by the main body 60A of the cover member 60, the pair of extending portions 60E and 60E, and the lid portion 54 covers the main body 60A and the pair of extending portions 60E and 60E. Is provided with a heat-resistant covering member (covering portion) 90. As a result, a gas flow passage 81 discharged from the release valve 57 is formed by a space extending in the X-axis direction surrounded by the lid portion 54 and the covering member 90. The covering member 90 may be fixed to the main body 60A and the pair of extending portions 60E and 60E by adhesion, or fixed to the main body 60A and the pair of extending portions 60E and 60E by press-fitting or fitting. May be.

  As shown in FIG. 5, the covering member 90 includes a covering main body portion 91 and a heat radiating portion 93. The covering main body portion 91 and the heat dissipation portion 93 are made of metal. As shown in FIG. 2, the covering main body portion 91 is a portion that covers the main body portion 60 </ b> A and the extending portion 60 </ b> E in the flow passage 81, and extends along the X-axis direction. An insulating member 97 is provided between the covering main body portion 91 and the lid portion 54 of the case 51. The insulating member 97 is a member that prevents energization from the secondary battery 11 to the covering member 90 extending along the X-axis direction. At both end portions in the extending direction (X-axis direction) of the covering main body portion 91, heat radiating portions 93 that release heat are provided.

  A through hole 93 </ b> A that penetrates in the thickness direction (X-axis direction) is provided at a substantially central portion of the heat dissipation portion 93. A bolt B for pressing and fixing the first battery holder 21 and the second battery holder 41 holding the secondary battery 11 with a pair of end plates 12 and 12 is inserted into the through hole 93A. Thereby, the heat radiating part 93 is fixed integrally with the end plate 12, the first battery holder 21 and the second battery holder 41.

  As described above, the covering member 90 is made of metal. Examples of metals include iron, aluminum and stainless steel. When iron is used as the covering member 90, it is preferable that at least a portion in contact with the gas discharged from the open valve 57 is subjected to a rust prevention treatment such as a galvanization treatment.

  Next, the effect of the battery module 10 of this embodiment is demonstrated. When an abnormality or the like occurs in the secondary battery 11 and the internal pressure of the case 51 reaches a threshold value, the release valve 57 is broken, and the flow passage 81 extending in the X-axis direction surrounded by the lid portion 54 and the covering member 90 is provided. Hot gas is discharged. The gas discharged to the flow passage 81 flows in the direction in which the secondary batteries 11 are arranged side by side, and is discharged to the periphery of the battery module 10.

  According to the battery module 10 of the present embodiment, the cover member 60 and the extending portions 60E and 60E are formed in a space extending in one direction formed by being surrounded by the extending portions 60E and 60E and the cover member 60. It is covered with a covering member 90. As a result, heat from the high-temperature gas flowing through the flow passage 81 is not easily transmitted to the cover member 60 and the extended portions 60E and 60E, and the cover member 60 and the extended portions 60E and 60E are thermally deformed, so Generation of a gap is suppressed. As a result, the airtightness of the flow path 81 can be ensured, and the leakage of gas from the flow path 81 can be suppressed.

  Further, in the battery module 10 of the present embodiment, the covering member 90 is formed of a metal having high thermal conductivity, and the heat radiating portions 93 are provided at both ends of the covering member 90. For this reason, heat from the high-temperature gas discharged from the open valve 57 of the secondary battery 11 is transferred in the X-axis direction (the direction in which the secondary batteries 11 are arranged in parallel) by the covering member 90, and the heat radiating section 93. Heat is transferred to. The heat radiating part 93 radiates heat transferred from the covering member 90. Thereby, the temperature rise of the covering member 90 is suppressed, and the temperature rise of the cover member 60 in contact with the covering member 90 is suppressed.

  In the battery module 10 of the present embodiment, the heat dissipating part 93 is integrally attached to the pair of end plates 12 and 12 that pressurize and restrain the plurality of secondary batteries 11. The heat transferred from the covering member 90 can be radiated. Further, the pair of end plates 12 and 12 may be attached to the housing of the electricity storage pack via the bracket 14 or the like. The housing of the electricity storage pack dissipates the heat transferred from the covering member 90.

  Moreover, since the covering member 90 made of metal is disposed, the strength of the flow passage 81 is improved. Thereby, for example, a jig can be hooked on the covering member 90. As a result, the battery module 10 can be easily moved and the transportability is improved. Further, when the jig is hooked on the covering member 90, it is preferable that the covering member 90 protrudes from the pair of end plates 12 and 12. This makes it easier to hook the jig on the covering member 90 and further improves the transportability.

  In the battery module 10 of the present embodiment, the cover member 60 is covered by the covering member 90 in the flow path 81 through which the gas discharged from the secondary battery 11 flows, and thus the cover member 60 is discharged from the secondary battery 11. Avoid direct contact with hot gases. For this reason, it is not necessary to form the cover member 60 using a resin having excellent heat resistance, and the manufacturing cost can be reduced.

  As mentioned above, although one Embodiment of this invention was described, this invention is not limited to the said embodiment. Various modifications can be made without departing from the spirit of the invention.

<Modification 1>
In the battery module 10 of the above embodiment, in the portion extending in the juxtaposed direction (X-axis direction) of the secondary batteries 11 surrounded by the main body portion 60A, the extending portion 60E, and the lid portion 54 of the cover member 60, the main body Although the example in which the covering member 90 having a shape covering the portion 60A and the extending portion 60E is arranged has been described, the present invention is not limited to this.

  For example, as shown in FIG. 6, the shape of the covering member (covering portion) 190 may be changed. Specifically, the spacer 195 may be provided on the surface 191A of the cover main body 191 that faces the main body 60A of the cover member 60 and the surface 191B of the cover member 60 that faces the extended portion 60E. The covering member 190 is supported by a base portion 193 having a triangular cross section orthogonal to the X-axis direction provided in the extending portion 60E of the cover member 60. The base portion 193 is made of an insulating material and extends along the X-axis direction. The spacer 195 may have the same length as the covering main body 191 along the X-axis direction. A plurality of spacers 195 having a predetermined length in the X-axis direction may be provided at predetermined intervals along the X-axis direction. Note that the base 193 may have a rectangular cross section perpendicular to the X-axis direction. Further, the base portion 193 may be disposed between the covering main body portion 191 and the lid portion 54 without being provided in the extending portion 60E.

  When the cover member 190 having such a shape provided with the spacer 195 is changed, the air layer 197 can be provided in a space surrounded by the cover member 60 and the cover member 190. When such an air layer 197 is formed, the thermal conductivity between the covering member 190 and the cover member 60 is lowered. Thereby, it can suppress that the heat | fever of the hot gas which flows through the flow path 181 is transmitted to the cover member 60, and can suppress a deformation | transformation of the cover member 60. FIG.

  The air layer 197 is formed between the covering member 190 (covering main body portion 191) and the main body portion 60A of the cover member 60 and between the covering member 190 (covering main body portion 191) and the extending portion 60E of the cover member 60. It may be formed on one side. When the air layer 197 is formed only between the covering member 190 (covering main body portion 191) and the main body portion 60A of the cover member 60, the base portion 193 is eliminated and the cover member 60 is extended as in the above embodiment. The installation part 60E can be made into a simple shape. Further, when the air layer 197 is formed only between the covering member 190 (covering main body portion 191) and the extending portion 60E of the cover member 60, the cross-sectional area of the flow passage 181 can be secured. Note that the configuration for forming the air layer 197 between the cover member 60 and the covering member 190 is not limited to the configuration in which the spacer 195 is provided.

<Modification 2>
Further, a heat insulating material may be disposed between the cover member 60 (the main body portion 60A and the extending portion 60E) and the covering member 90 according to the embodiment shown in FIG. For example, as shown in FIG. 7, the main body portion 60 </ b> A and the extending portion 60 </ b> E are covered with a portion extending in the X-axis direction surrounded by the main body portion 60 </ b> A and the extending portion 60 </ b> E and the lid portion 54 of the cover member 60. The heat-resistant covering member (covering portion) 290 is arranged as described above, and between the covering member 290 (covering main body portion 291) and the main body portion 60A, the covering member 290 (covering main body portion 291), and the extending portion 60E. The heat insulating material 293 may be disposed on at least one of them. With the flow passage 281 having such a configuration, the temperature rise of the cover member 60 can be further suppressed.

  Further, a heat insulating material 293 is disposed between one of the covering member 290 (covering main body portion 291) and the main body portion 60A and between the covering member 290 (covering main body portion 291) and the extending portion 60E, and the other is a modified example. The air layer 197 described in 1 may be formed.

<Modification 3>
Moreover, although the heat radiating part 93 provided in the both ends in the X-axis direction of the coating | coated member 90 of the said embodiment was given and demonstrated as an example, the present invention is not limited to this.

  For example, both ends of the covering member 90 may be directly connected to the end plate 12 without providing the heat radiating portions 93 at both ends in the X-axis direction of the covering member 90. Further, the heat radiating portion 93 may not be provided at one end portion in the X-axis direction of the covering member 90, and one end portion of the covering member 90 may be directly connected to the end plate 12. Further, the covering member 90 may be connected to a member having a large heat capacity other than the end plate 12. Even in these cases, if the member to which the covering member 90 is connected has a predetermined heat capacity, the temperature rise of the cover member 60 can be efficiently suppressed.

  Further, for example, the covering member 90 may not be connected to the pair of end plates 12 and 12, and the heat radiating portions 93 may be provided at both ends in the X-axis direction. Further, the covering member 90 may not be connected to the one end plate 12, and the heat radiating portion 93 may be provided at an end portion on one side not connected to the end plate 12.

<Other variations>
In the above-described embodiment, the pair of extending portions 60E and 60E extending in the X-axis direction has been described as an example formed as a part of the cover member 60, but the present invention is not limited to this. For example, the pair of extending portions 60 </ b> E and 60 </ b> E may be formed as a part of the first battery holder 21 and the second battery holder 41, or provided as a part of the upper surface 54 </ b> A of the lid portion 54 of the secondary battery 11. May be. Further, the pair of extending portions 60E and 60E may be provided as independent flat members.

  The cross-sectional areas of the flow paths 81, 181, 281 of the power storage module according to the embodiment or the modification can be changed as appropriate by changing the positions of the pair of extending portions 60E, 60E in the Y-axis direction. That is, in the Y-axis direction, the position of the pair of extending portions 60E and 60E can be changed within a range that is larger than the width of the release valve 57 and smaller than the distance between the locking projections 37 and 38.

  Although the cover member 60 which concerns on the said embodiment or modification was given and demonstrated the example comprised from several cover members (the 1st cover member 61 and the 2nd cover member 62), the cover member which consists of a single member 60 may be sufficient. Similarly, the battery holder may be composed of a single member. Moreover, although the said embodiment gave and demonstrated the example in which multiple types of battery holders (the 1st battery holder 21 and the 2nd battery holder 41) were used, you may use only one type of battery holder. Moreover, in the said embodiment, the latching protrusions 37 and 38 do not need to shift to the axial direction of the pillar members 32 and 33. FIG. In this case, the through holes 71A, 71B, 71C may not be shifted. In this case, the shape of the locking projections 37 and 38 is changed so that only the corresponding through holes 71A, 71B and 71C can be penetrated, and the arrangement of the first cover member 61 and the second cover member 62 is reversed. It may be suppressed.

  In the above embodiment, the locking projections 37 and 38 are provided on both the column members 32 and 33 of the first battery holder 21, but the locking projections 37 and 38 are provided only on one of the column members 32 and 33. Also good. Moreover, in the said embodiment, although the latching protrusions 37 and 38 were provided in the column members 32 and 33 of the 1st battery holder 21, you may provide the latching protrusions 37 and 38 in another position.

  In the above-described embodiment, an example of a power storage module including a plurality of battery holders has been described. However, a single battery holder may be a power storage module configured to hold a plurality of secondary batteries 11.

  DESCRIPTION OF SYMBOLS 10 ... Battery module (electric storage module), 11 ... Secondary battery (electric storage apparatus), 12 ... End plate, 21 ... First battery holder, 37, 38 ... Locking protrusion, 41 ... Second battery holder, 51 ... Case, 52 ... Electrode assembly, 54 ... Lid, 54A ... Upper surface (installation surface) of the lid, 57 ... Opening valve, 60 ... Cover member (cover), 60A ... Main body, 60D ... Standing part, 60E ... Extension 71A, 71B, 71C ... through hole, 81, 181, 281 ... flow passage, 90, 190, 290 ... covering member (covering part), 91, 191, 291 ... covering body part, 93 ... heat dissipation part, 97 Insulating member, 193, base portion, 195, spacer, 197, air layer, 293, heat insulating material, B, bolt, N, nut.

Claims (7)

A power storage device having an electrode assembly having a positive electrode and a negative electrode, a case that houses the electrode assembly, and an open valve that discharges gas inside the case to the outside of the case is juxtaposed in one direction. A power storage module,
A pair of extending portions disposed so as to face each other across the release valve and extending in the one direction;
A cover portion provided via the extension portion with respect to the installation surface so as to face an installation surface which is a surface on which the release valve is provided in the case;
A covering portion that covers the cover portion and the extension portion in a space extending in the one direction surrounded by the extension portion, the installation surface, and the cover portion;
With
The electricity storage module, wherein the gas flow path discharged from the open valve is formed by a space extending in the one direction surrounded by the covering portion and the installation surface.   The power storage module according to claim 1, wherein the cover portion and the extending portion are formed of a resin, and the covering portion is formed of a heat resistant material.   The electrical storage module of Claim 1 or 2 with which the said coating | coated part is formed with the metal.   The electrical storage module as described in any one of Claims 1-3 by which the thermal radiation part is provided in the said coating | coated part. A pair of end plates that pressurize and restrain the plurality of power storage devices are disposed at both ends in the one direction of the plurality of power storage devices arranged in parallel in the one direction,
The end plate is made of metal;
The power storage module according to any one of claims 1 to 4, wherein the covering portion is connected to the end plate.   The power storage module according to any one of claims 1 to 5, wherein an air layer is formed between at least one of the covering portion and the cover portion and between the covering portion and the extending portion. .   The power storage module according to claim 1, wherein a heat insulating material is disposed between at least one of the covering portion and the cover portion and between the covering portion and the extending portion. .

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