JP2016058285A - Power storage device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a power storage device capable of improving reliability.SOLUTION: A power storage device 100 includes at least one power storage cell holding part 50 that holds a power storage cell 10. In the power storage device 100, the power storage cell holding part 50 includes: a cell support 20 that supports the power storage cell 10; a radiator plate 30 which is provided so as to hold the power storage cell 10 with the cell support 20 and in contact with the power storage cell 10; and a pressing part 41 which presses the radiator plate 30 against the power storage cell 10. The radiator plate 30 includes a plurality of divided pieces 32 which are formed from at least one slit 31 extending from an edge 35 of the radiator plate. The pushing part 41 pushes the radiator plate 30 at a first position A that is an end of the divided pieces 32, and the radiator plate 30 at a second position B farther from the edge 35 from the first position A against the power storage cell 10.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a power storage device.

  A storage cell such as a lithium ion capacitor or a lithium ion secondary battery generally has a laminate film in which a positive electrode and a negative electrode are alternately laminated and a separator impregnated with an electrolyte is disposed between the positive electrode and the negative electrode. Is housed in an encapsulating bag obtained by laminating, and the positive and negative terminals for discharging and charging connected to the power storage unit are led out from the encapsulating bag. Since such an electricity storage cell generates heat due to Joule heat due to current during charging and discharging, the temperature of the electricity storage cell may increase when charging and discharging are repeated. And the electrical storage cell has a big influence with respect to temperature, and when it becomes high temperature, performance may fall large. For this reason, in order to prevent the heat generation of the electricity storage cell, an electricity storage device is known in which a heat dissipation plate is provided in contact with the energy storage cell and the heat dissipation plate releases the heat of the energy storage cell as the electricity storage cell expands. For example, Patent Document 1 below discloses a battery device that suppresses the propagation of heat generated by an abnormal unit cell to an adjacent unit cell by allowing the cooling plate to be bent.

JP 2013-232364 A

  However, the battery device described in Patent Document 1 described above has the following problems.

  That is, in the battery device described in Patent Document 1, since the cooling plate bends when the unit cell expands, the expanded unit cell and the cooling plate are in point contact or line contact, and the unit cell contacts the cooling plate. The area is reduced. For this reason, in the battery device described in Patent Document 1, the heat dissipation effect by the cooling plate is not sufficient. As a result, the battery device described in Patent Document 1 has room for improvement in terms of reliability.

  The present invention has been made in view of the above circumstances, and an object thereof is to provide a power storage device capable of improving reliability.

  In order to solve the above-described problem, the present invention provides a power storage device including at least one power storage cell holding unit that holds a power storage cell, wherein the power storage cell holding unit supports the power storage cell, and A heat sink provided so as to sandwich the power storage cell with the cell support and in contact with the power storage cell, and a pressing portion that presses the heat dissipation plate against the power storage cell, the heat sink from the edge It has a plurality of divided pieces formed by at least one slit extending, and the pressing portion is a first position that is an end of the divided piece of the heat radiating plate, and the edge of the heat radiating plate. A power storage device in which a second position farther from the first position than the first position is pressed against the power storage cell.

  According to the power storage device of the present invention, in the power storage cell holding portion, when the power storage cell expands due to the generation of the gas inside thereof, the shape of the surface changes so as to protrude toward the heat sink. At this time, when the heat sink has no slit extending from its edge and the heat sink does not have a plurality of divided pieces formed by the slit, the shape of the heat sink is changed to the surface shape of the storage cell. Since it is not easy to change them together, the contact area between the surface of the electricity storage cell and the heat radiating plate is reduced, and there is a possibility that heat generated in the electricity storage cell is not sufficiently released.

  On the other hand, according to the power storage device of the present invention, the heat sink has a plurality of divided pieces formed by at least one slit extending from the edge thereof. Here, each of the plurality of divided pieces formed by the slits has a degree of freedom in its extending direction. In addition, the pressing portion presses the first position, which is the end portion of the split piece of the heat sink, and the second position farther from the first position than the edge of the heat sink to the storage cell. For this reason, even if an electrical storage cell expand | swells, the division | segmentation piece of a heat sink can be made to follow a change of the surface shape of an electrical storage cell easily, closely_contact | adhering to an electrical storage cell. For this reason, the heat generated in the storage cell can be effectively released to the outside through the heat radiating plate. Therefore, according to the power storage device of the present invention, reliability can be improved.

  In the power storage device, the pressing portion includes a leaf spring that presses the first position of the split piece of the heat sink against the power storage cell, and a leaf spring that presses the second position of the heat sink against the power storage cell. It is preferable to have.

  In this case, when the power storage cell expands and pushes out the heat dissipation plate, the leaf spring of the pressing portion has a room to be elastically deformed and pushed out to the side opposite to the power storage cell. That is, the pressing portion can allow the storage cell to expand at the first position and the second position of the heat sink. For this reason, it becomes possible to make the shape of the surface by the side of a heat sink relatively smooth among electrical storage cells. As a result, it becomes possible to make the shape of the heat sink easily follow the shape change of the surface of the heat dissipation plate side of the storage cell.

  The power storage device preferably further includes an elastic member provided on the opposite side of the heat dissipation plate from the power storage cell, and the pressing portion presses the heat dissipation plate against the power storage cell via the elastic member.

  In this case, when the storage cell expands, the shape of the heat dissipation plate changes, and accordingly, the shape of the elastic member also changes. At this time, since the pressing portion presses the heat radiating plate against the power storage cell via the elastic member, a force that pushes the heat radiating plate back to the power storage cell acts on the elastic member. For this reason, about the shape of the part which is contacting the electrical storage cell among heat sinks, the change of the surface shape of an electrical storage cell can be tracked effectively.

  In the power storage device, when the heat dissipation plate is viewed in a direction overlapping the power storage cell, the heat dissipation plate extends from the inside of the power storage cell to protrude outside the power storage cell, and the slit is It is preferable to form along the extending direction of the said heat sink from the said edge part of the said heat sink.

  In this case, the heat generated in the storage cell moves along the extending direction of the heat sink. At this time, since the slit is formed in the heat dissipation plate along the extending direction of the heat dissipation plate, the heat dissipation from the power storage cell is performed more smoothly, and the reliability of the power storage device can be further improved.

  The power storage device further includes a pressing portion holding body that holds the pressing portion and holds the heat dissipation plate together with the power storage cell, and at least two positioning members that penetrate the pressing portion holding body and the power storage cell. The pressing portion holding body includes a main body portion and a protruding portion provided so as to protrude outside the main body portion and having a through-hole penetrating the positioning member; It is preferable to have a main body part and a projecting part that is provided so as to protrude to the outside of the main body part and that has a through hole that penetrates the positioning member.

  In this case, the power storage device further includes at least two positioning members penetrating the pressing portion holding body and the power storage cell, and the positioning members are installed in the power storage cell so as to protrude outside the main body. The through hole of the part is penetrated. For this reason, compared with the case where a through-hole is formed in a main-body part and a positioning member penetrates the through-hole, it becomes possible to use a larger heat sink. For this reason, the heat which generate | occur | produced in the electrical storage cell can be more effectively discharged | emitted outside through a heat sink. In addition, since the positioning member penetrates the through-hole of the protruding portion of the storage cell and the through-hole of the protruding portion of the pressing member holding body, the storage cell is firmly fixed to the pressing member holding body, so the power storage device of the present invention Can be strong against vibration shock from the outside, and can improve mechanical durability.

  ADVANTAGE OF THE INVENTION According to this invention, the electrical storage apparatus which can improve reliability is provided.

It is a perspective view which shows one Embodiment of the electrical storage apparatus of this invention. It is a disassembled perspective view which shows an example of the electrical storage cell holding part of the electrical storage apparatus of FIG. It is a top view which shows the electrical storage cell of FIG. FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3. It is a top view which shows the heat sink of FIG. It is sectional drawing which shows a part of electrical storage cell holding part of FIG. In FIG. 6, it is sectional drawing which shows the state which the electrical storage cell expanded. It is a top view which shows the 1st modification of the heat sink of FIG. It is a top view which shows the 2nd modification of the heat sink of FIG. It is sectional drawing which shows a part of electrical storage cell holding | maintenance part in other embodiment of the electrical storage apparatus of this invention.

  Hereinafter, embodiments of the present invention will be described in detail with reference to FIGS. 1 is a perspective view showing a preferred embodiment of the power storage device of the present invention, FIG. 2 is an exploded perspective view showing an example of a power storage cell holding portion of the power storage device of FIG. 1, and FIG. 3 is a power storage cell of FIG. 4 is a cross-sectional view taken along line IV-IV in FIG. 3, FIG. 5 is a plan view showing the heat radiating plate in FIG. 1, and FIG. 6 is a part of the storage cell holding portion in FIG. It is sectional drawing shown.

  As illustrated in FIG. 1, the power storage device 100 includes a plurality of (12 in FIG. 1) power storage cell holding units 50 that hold power storage cells.

  As shown in FIG. 2, each storage cell holding unit 50 contacts the storage cell 10 so as to sandwich the storage cell 10 together with the storage cell 10, the cell support 20 that supports the storage cell 10, and the cell support 20. The heat sink 30 is provided so as to hold the pressing portion 41 that presses the heat sink 30 against the storage cell 10, and the pressing portion holding body 40 that holds the heat sink 30 together with the storage cell 10. As shown in FIG. 1, the power storage device 100 further includes four positioning members 60 penetrating the cell support body 20, the power storage cell 10, and the pressing portion holding body 40, and the distal end of the positioning member 60 is It is fastened by a fastening member such as a nut.

  Here, the storage cell 10 may be any cell as long as it has a storage function. For example, specific examples of the storage cell 10 include a lithium ion capacitor (LIC), a lithium ion secondary battery (LIB), and an electric double layer. A capacitor (EDLC) etc. are mentioned.

  As shown in FIG. 3, the storage cell 10 includes a main body portion 11 indicated by a two-dot chain line, and four projecting portions 12 that are provided so as to protrude outside the main body portion 11 and are fixed to the cell support 20. The positive terminal 13 extends from the inside of the main body 11 to the outside, and the negative terminal 14 extends from the inside of the main body 11 to the outside. The positive terminal 13 and the negative terminal 14 extend in directions opposite to each other with respect to the main body 11. The main body 11 is provided with two protrusions 12 so as to sandwich the positive electrode terminal 13, and two protrusions 12 so as to sandwich the negative electrode terminal 14. Each protrusion 12 is formed with a through-hole 12a through which the positioning member 60 passes.

  As shown in FIG. 4, the power storage cell 10 has a positive electrode and a negative electrode alternately stacked, and a power storage unit 15 in which a separator impregnated with an electrolyte is disposed between the positive electrode and the negative electrode is sandwiched between laminate films and sealed. The main body 11 includes a power storage unit 15, a bag-shaped storage unit 16 that stores the power storage unit 15, and an annular sealing unit 17 provided around the storage unit 16. Have. The positive terminal 13 and the negative terminal 14 shown in FIG.

  Here, the surfaces S1 and S2 of the pair of sandwiching portions 16a and 16b sandwiching the power storage unit 15 in the housing unit 16 are flat surfaces when the power storage cell 10 is not expanded.

  On the other hand, as shown in FIG. 2, the cell support 20 includes a plate-like main body 21 that holds the storage cell 10 and two protrusions 22 that are provided so as to sandwich the main body 21. The protruding portion 22 has a through hole 22 a that allows the positioning member 60 to pass therethrough. The cell support 20 is made of, for example, an insulating resin (for example, ABS resin).

  Further, as shown in FIG. 5, when the heat sink 30 is viewed in a direction overlapping the power storage cell 10, the heat sink 30 extends in a direction protruding from the inside of the power storage cell 10 to the outside of the power storage cell 10. In other words, the heat sink 30 extends in a direction orthogonal to the direction connecting the positive terminal 13 and the negative terminal 14. Further, the heat sink 30 includes an overlapping portion 33 that overlaps the power storage cell 10 and an exposed portion 34 that does not overlap the power storage cell 10 when the heat sink 30 is viewed in a direction overlapping the power storage cell 10. The reason why the heat radiating plate 30 extends from the inside of the power storage cell 10 in a direction protruding to the outside of the power storage cell 10 is to release heat generated in the power storage cell 10 to the outside of the power storage cell 10 through the heat radiating plate 30. . In the overlapping portion 33 of the heat radiating plate 30, a plurality of (five in FIG. 5) slits 31 extending from the side 35 a farthest from the exposed portion 34 among the edge portions 35 of the heat radiating plate 30 are parallel to each other. The plurality of divided pieces 32 are formed by the slits 31. The slit 31 is formed along the extending direction of the heat sink 30 in the heat sink 30.

  As shown in FIG. 2, the pressing portion holding body 40 includes a plate-like main body portion 42 that holds the pressing portion 41, and two protruding portions 43 that are provided so as to sandwich the main body portion 42. The portion 43 has a through hole 43 a that allows the positioning member 60 to pass therethrough. The pressing portion 41 has a first position A that is an end portion of the split piece 32 of the radiator plate 30 and a second position B that is farther from the first position A than the side 35 a of the edge portion 35 of the radiator plate 30. It is pressed (see FIG. 5).

  Specifically, the pressing portion 41 includes a plate spring 41 a that presses the first position A of the split piece 32 of the heat radiating plate 30 against the power storage cell 10 and a plate spring 41 b that presses the second position B of the heat radiating plate 30 against the power storage cell 10. And a connecting portion 41c for connecting the leaf springs 41a and 41b (see FIG. 2). The two leaf springs 41a and 41b are formed in the main body portion 42 so as to extend in directions opposite to each other with respect to the connection portion 41c. Of the spring main body portion 44 and the spring main body portion 44, a protrusion provided on the heat dissipation plate 30 side. Part 45. The leaf springs 41a and 41b can be obtained by forming a U-shaped notch in the main body portion. The pressing portion holder 40 is made of, for example, an insulating resin (for example, ABS resin). In FIG. 5, a band-like hatched portion 80 a surrounded by a two-dot chain line indicates a region where the protrusion 45 of the leaf spring 41 a is in contact with the overlapping portion 33 of the heat radiating plate 30. A belt-like hatched portion 80 b surrounded by a dotted line indicates a region where the protrusion 45 of the leaf spring 41 b is in contact with the overlapping portion 33 of the heat radiating plate 30.

  Here, as shown in FIG. 2, the two leaf springs 41 a and 41 b extend along the extending direction of the slit 31 of the heat radiating plate 30. Further, the protrusion 45 of the leaf spring 41 a is a continuous bar-like member, and the protrusion 45 presses the first position A of each divided piece 32 against the storage cell 10. On the other hand, the protrusion 45 of the leaf spring 41b presses the heat dissipation plate 30 against the storage cell 10 at a position where the slit 31 is disposed between the heat dissipation plate 30 and the side 35a of the edge 35 in the present embodiment. . That is, in the present embodiment, the second position B is a position where the slit 31 is disposed between the heat radiation plate 30 and the side 35 a of the edge portion 35.

  In FIG. 2, when the pressing unit holder 40 holds another storage cell 10 on the opposite side of the pressing unit holder 40 from the storage cell 10 of FIG. 2, When the pressing portion holding body 40 does not hold another power storage cell 10 on the opposite side of the pressing portion holding body 40 from the power storage cell 10 in FIG. Only functions as 40. In addition, when another power storage cell 10 is disposed on the opposite side of the cell support 20 from the power storage cell 10 of FIG. 2 with respect to the cell support 20, the cell support 20 serves as a pressing portion holder 40 of the other power storage cell 10. 2, and functions only as the cell support 20 when another power storage cell 10 is not disposed on the opposite side of the cell support 20 of FIG. In this case, in the cell support body 20, the pressing part 41 becomes unnecessary.

  Furthermore, the plurality of power storage cells 10 in the power storage device 100 are alternately reversed in the direction of the positive electrode terminal 13 and the negative electrode terminal 14 in the stacking direction, and the positive electrode terminal 13 and the negative electrode terminal 14 of the adjacent power storage cells 10 are. Is connected. Thus, the plurality of power storage cells 10 are connected in series.

  Next, the operation of the power storage device 100 will be described with reference to FIG. FIG. 7 is a cross-sectional view showing a state where the storage cell 10 in FIG. 6 has expanded.

  According to the power storage device 100, when the power storage cell 10 is not expanded due to the generation of gas therein, the power storage cell 10, the radiator plate 30, and the protrusion 45 of the pressing portion 41 are in a state as shown in FIG. ing. That is, the entire surface 16 b of the storage cell 10 is in contact with the surface S 3 of the main body 21 of the cell support 20, and the entire surface 16 a of the storage cell 10 is in contact with the heat sink 30.

  On the other hand, as illustrated in FIG. 7, when the storage cell 10 expands due to the generation of gas therein, the shape of the surface S <b> 1 of the holding portion 16 a of the housing portion 16 changes from a flat surface to a curved surface. In other words, the shape of the surface S <b> 1 of the holding portion 16 a of the housing portion 16 changes so as to be convex toward the heat sink 30. In addition, the shape of the surface S2 of the clamping part 16b of the storage part 16 of the storage cell 10 also changes from a flat surface to a curved surface.

  At this time, when the heat dissipation plate 30 is not formed with the slit 31 extending from the edge 35 and the heat dissipation plate 30 does not have the divided pieces 32 formed by the slit 31, the shape of the heat dissipation plate 30 is changed. Since it is not easy to do so, the contact area between the surface S1 of the sandwiching portion 16a of the housing portion 16 of the storage cell 10 and the heat sink 30 may decrease, and the heat generated in the storage cell 10 may not be sufficiently released. There is.

  On the other hand, according to power storage device 100, heat dissipation plate 30 has a plurality of divided pieces 32 formed by a plurality of slits 31 extending from side 35 a of edge 35. Here, each of the plurality of divided pieces 32 formed by the slits 31 has a degree of freedom in its extending direction. In addition, the pressing portion 41 has a first position A at the end of the split piece 32 of the heat sink 30 and a second position B farther from the first position A than the side 35 a of the edge 35 of the heat sink 30. Is pressed against the storage cell 10. For this reason, even if the electrical storage cell 10 expands, it is possible to easily follow the change in the surface shape of the electrical storage cell 10 while keeping the divided pieces 32 of the heat dissipation plate 30 in close contact with the electrical storage cell 10. For this reason, the heat generated in the storage cell 10 can be effectively released to the outside through the heat radiating plate 30. Therefore, according to the power storage device 100, the reliability can be improved. In particular, in the power storage device 100, the second position B is a position where the slit 31 is disposed between the radiator plate 30 and the side 35 a of the edge 35. That is, the second position B is not on the divided piece 32. For this reason, the freedom degree of the division | segmentation edge | side 32 becomes higher compared with the case where the 2nd position B exists on the division | segmentation piece 32, and the heat sink 30 becomes easy to follow the surface shape of the electrical storage cell 10 more.

  Moreover, in the electrical storage apparatus 100, the pressing part 41 is comprised by leaf | plate spring 41a, 41b and the connection part 41c. For this reason, when the storage cell 10 expands and the heat dissipation plate 30 is pushed out to the opposite side of the storage cell 10, the pressing portion 41 is configured by the leaf springs 41a and 41b, and thus elastically deforms and is opposite to the storage cell 10. There is room for extrusion. In other words, the pressing portion 41 has the first and second positions A and B in the heat sink 30, that is, the position where the protrusion 45 presses the power storage cell 10 through the heat sink 30 in the heat sink 30. 10 expansions can be allowed. For this reason, it becomes possible to make comparatively smooth the shape of surface S1 by the side of the heat sink 30 among the electrical storage cells 10. FIG. As a result, the shape of the heat sink 30 can be made to easily follow the change in the shape of the surface S1 on the heat sink 30 side of the storage cell 10.

  Further, in the power storage device 100, when the heat sink 30 is viewed in a direction overlapping the power storage cell 10, the heat sink 30 extends so as to protrude from the inside of the power storage cell 10 to the outside of the power storage cell 10. Is formed along the extending direction of the heat sink 30 from the side 35 a of the edge 35 of the heat sink 30. For this reason, the heat generated in the storage cell 10 moves along the extending direction of the heat sink 30. For this reason, heat dissipation from the electricity storage cell 10 is performed more smoothly, and the reliability of the electricity storage device 100 can be further improved.

  Furthermore, the power storage device 100 holds the pressing portion 41, and includes a pressing portion holding body 40 that holds the heat dissipation plate 30 together with the storage cell 10, and four positioning members 60 that penetrate the pressing portion holding body 40 and the storage cell 10. The pressing portion holding body 40 further includes a main body portion 42 and a protrusion portion 43 provided so as to protrude outside the main body portion 42 and having a through hole 43a through which the positioning member 60 passes. The storage cell 10 includes a main body 11 and a protrusion 12 provided with a through-hole 12a that is provided so as to protrude outside the main body 11 and allows the positioning member 60 to pass therethrough. That is, the power storage device 100 further includes four positioning members 60 penetrating the pressing portion holder 40 and the power storage cell 10, and the positioning members 60 protrude outside the main body 11 in the power storage cell 10. It penetrates the through hole 12a of the projecting portion 12 installed in a shape. For this reason, compared with the case where there is no protrusion part 12 and a through-hole is formed in the main-body part 11, and the positioning member 60 penetrates the through-hole, it becomes possible to use the larger heat sink 30. For this reason, the heat generated in the storage cell 10 can be more effectively released to the outside through the heat sink 30. Further, when the positioning member 60 penetrates the through hole 12a of the protruding portion 12 of the storage cell 10 and the through hole 43a of the protruding portion 43 of the pressing member holding body 40, the storage cell 10 is firmly fixed to the pressing member holding body 40. Therefore, the power storage device 100 is resistant to vibration shocks from the outside and can improve mechanical durability.

  Next, the heat sink 30 will be specifically described.

  The heat radiating plate 30 is usually made of a metal material or the like from the viewpoint of thermal conductivity. Examples of the metal material include aluminum and copper.

  The thickness of the heat radiating plate 30 is not particularly limited as long as it can follow the change of the surface S1 of the housing portion 16 as the housing portion 16 of the storage cell 10 expands. Is preferably 0.08 to 1 mm, more preferably 0.2 to 0.3 mm.

  The width of the slit 31 of the heat sink 30 is not particularly limited, but is preferably 100 to 1000 μm. In this case, as compared with the case where the width of the slit 31 is less than 100 μm, it is possible to easily follow the change of the surface S <b> 1 of the housing portion 16 with the expansion of the housing portion 16 of the storage cell 10. Moreover, since the heat dissipation of the electrical storage cell 10 can be more effectively performed as compared with the case where the width of the slit 31 exceeds 1000 μm when the width of the slit 31 is 100 to 1000 μm, the reliability of the electrical storage device 100 is further improved. Can be improved.

  The length of the slit 31 of the heat radiating plate 30 is not particularly limited, but the length along the extending direction of the heat radiating plate 30 at the contact surface between the heat radiating plate 30 and the surface S1 of the accommodating portion 16 of the storage cell 10 is not limited. It is preferable to set it as 10 to 50%. The lengths of the plurality of slits 31 may be the same as or different from each other.

  It is preferable that the space | interval between the slits 31 of the heat sink 30 is 10-100 mm from a viewpoint of improving a heat dissipation effect.

  Next, the pressing portion 41 will be specifically described.

  The height of the protrusion 45 of the leaf springs 41a and 41b constituting the pressing portion 41 from the surface of the main body portion 42 of the pressing portion holding body 40 on the side of the heat radiating plate 30 is radiated when the heat radiating plate 30 is curved. It is preferable that the plate 30 has a height that does not contact the pressing portion holding body 40. Specifically, the height of the protruding portion 45 of the pressing portion 41 from the surface on the heat sink 30 side of the main body portion 42 of the pressing portion holding body 40 may be 0.2 to 2 mm.

  Further, each of the leaf springs 41a and 41b constituting the pressing portion 41 has only one protrusion 45, but the protrusion 45 may be composed of a plurality of protrusions spaced apart from each other. In this case, each protrusion 45 presses the first position A and the second position B of each divided piece 32 against the storage cell 10, and it is possible to increase the pressure applied to the heat dissipation plate 30 by the protrusion. Therefore, the pressing portion 41 can be effectively pressed against the storage cell 10 via the heat sink 30.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the plurality of slits 31 are formed in the heat radiating plate 30, but only one slit 31 may be formed in the heat radiating plate 30.

  Moreover, in the said embodiment, although the slit 31 is formed along the extension direction of the heat sink 30 in the heat sink 30, the slit 31 does not necessarily need to be formed along the extension direction of the heat sink 30. For example, as shown in FIG. 8, the slit 31 may be formed in a direction orthogonal to the extending direction of the heat sink 30. Here, as shown in FIG. 8, the slit 31 extends from a side 35 b on the side close to the positive electrode terminal 13 in the edge 35 of the heat radiating plate 30. That is, one end of the slit 31 reaches the side 35 b on the side close to the positive electrode terminal 13 in the edge 35 of the heat radiating plate 30. In FIG. 8, the first position A is the end of the divided piece 32, and the second position B is the first position A of the divided piece 32 with respect to the side 35 b of the edge 35 in the heat dissipation plate 30. It is a farther position.

  Moreover, in the said embodiment, although the slit 31 of the heat sink 30 is extended only from the edge | side 35a of the edge part 35, you may extend from the some edge | side. For example, as shown in FIG. 9, the slit 31 of the heat radiating plate 30 may extend from each of the side 35 b of the edge 35 and the side 35 c on the side opposite to the side 35 b (on the negative electrode terminal 14 side). In FIG. 9, with respect to the divided piece 32 formed by the slit 31 extending from the side 35 b of the edge 35, the first position A is closer to the side 35 b of the edge 35 than the end of the divided piece 32. The second position B is a position closer to the position B of the radiator plate 30 than the first position A of the split piece 32 with respect to the side 35b of the edge 35, in other words, the side opposite to the side 35b. It is a position closer to 35c. On the other hand, with respect to the divided piece 32 formed by the slit 31 extending from the side 35c of the edge 35, the first position A is a position closer to the side 35c of the edge 35, and the second position B is a heat dissipation. Of the plate 30, the position B is farther from the first position A of the segment 32 with respect to the side 35 c of the edge 35, in other words, the position closer to the side 35 b on the opposite side of the side 35 c.

  Moreover, in the said embodiment, although the pressing part 41 is contacting the heat sink 30 directly, the elastic member 70 may be provided between the pressing part 41 and the heat sink 30, as shown in FIG. That is, the elastic member 70 may be provided on the side of the heat radiating plate 30 opposite to the storage cell 10. Here, the protrusion 45 of the pressing portion 41 presses the heat dissipation plate 30 against the storage cell 10 via the elastic member 70. In this case, when the accommodating part 16 of the electrical storage cell 10 expands, the shape of the surface of the heat radiating plate 30 changes, and the shape of the elastic member 70 changes accordingly. At this time, since the protrusion 45 of the pressing portion 41 presses the heat dissipation plate 30 against the storage cell 10 via the elastic member 70, a force that pushes the heat dissipation plate 30 back to the storage cell 10 acts on the elastic member 70. For this reason, about the shape of the part which is contacting the electrical storage cell 10 among the heat sinks 30, the shape change of the surface S1 of the accommodating part 16 of the electrical storage cell 10 can be effectively tracked.

  Examples of the elastic member 70 include an insulating material such as a rubber plate and a sponge, and a metal material.

  Furthermore, in the said embodiment, although the pressing part 41 is comprised by the leaf | plate springs 41a and 41b and these connection parts 41c, the pressing part 41 is not comprised by the leaf | plate springs 41a and 41b and these connection parts 41c. May be. For example, in the cell support 20, the leaf springs 41 a and 41 b are obtained by forming U-shaped notches in the main body portion 42, but the notches need not be formed. In this case, the pressing portion 41 is composed of only the protrusion 45.

  In the above embodiment, four positioning members 60 are used. However, at least two positioning members 60 may be used, and two, three, or five or more may be used.

  Furthermore, in the said embodiment, the 2nd position B is a position which arrange | positions the slit 31 between the edge | sides 35a of the edge part 35 among the heat sinks 30, and it is not on the division | segmentation piece 32, but 2nd The position B may be on the divided piece 32.

  Furthermore, in the said embodiment, the heat conductive sheet may be further provided between the electrical storage cell 10 and the heat sink 30. FIG.

  Furthermore, in the above embodiment, the power storage device 100 includes a plurality of power storage cell holding units 50. However, the power storage device of the present invention does not necessarily include the plurality of power storage cell holding units 50, and one power storage cell holding unit 50 is provided. It may be comprised only by.

DESCRIPTION OF SYMBOLS 10 ... Power storage cell 11 ... Main-body part 12 ... Protrusion part 12a ... Through-hole 20 ... Cell support body 30 ... Heat sink 31 ... Slit 32 ... Split piece 35 ... Edge part 35a, 35b, 35c ... Side 40 ... Pressing part holding body 41 ... Pressing part 41a, 41b ... Plate spring 42 ... Body part 43 ... Projection part 43a ... Through hole 50 ... Storage cell holding part 60 ... Positioning member 70 ... Elastic member 100 ... Power storage device

Claims (5)

A power storage device including at least one power storage cell holding unit that holds a power storage cell,
The storage cell holding unit is
A cell support for supporting the electricity storage cell;
A heat sink provided to sandwich the electricity storage cell with the cell support and to contact the electricity storage cell;
A pressing portion that presses the heat sink against the storage cell,
The heat dissipation plate has a plurality of divided pieces formed by at least one slit extending from the edge thereof,
The pressing portion has a first position that is an end portion of the divided piece of the heat radiating plate, and a second position that is farther from the first position than the edge of the heat radiating plate in the storage cell. The power storage device being pressed. The pressing portion is
A leaf spring that presses the first position of the split piece of the heat sink against the storage cell;
The power storage device according to claim 1, further comprising a leaf spring that presses the second position of the heat radiating plate against the power storage cell. An elastic member provided on the opposite side of the heat dissipation plate from the electricity storage cell;
The power storage device according to claim 1 or 2, wherein the pressing portion presses the heat radiating plate against the power storage cell via the elastic member. When the heat sink is viewed in a direction overlapping the power storage cell, the heat sink extends from the inside of the power storage cell to protrude outside the power storage cell,
The power storage device according to any one of claims 1 to 3, wherein the slit is formed along an extending direction of the heat dissipation plate from the edge portion of the heat dissipation plate. A pressing portion holding body that holds the pressing portion and holds the heat dissipation plate together with the electricity storage cell;
And further comprising at least two positioning members penetrating the pressing portion holder and the storage cell,
The pressing part holding body has a main body part and a protruding part provided so as to protrude to the outside of the main body part and having a through hole that penetrates the positioning member;
The power storage cell includes a main body portion and a protruding portion provided so as to protrude outside the main body portion and having a through hole that penetrates the positioning member.
The electrical storage apparatus as described in any one of Claims 1-4.

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