JP6507696B2 - Power storage device module and power storage device pack - Google Patents

Description

  The present invention relates to a power storage device module and a power storage device pack.

  As a conventional power storage device module, for example, the technology described in Patent Document 1 is known. The power storage device module described in Patent Document 1 includes a laminate having a battery and a battery holder for holding the battery, a pair of end plates disposed on both sides of the laminate, a laminate, and one end plate And a plate-like rubber member having elasticity in the stacking direction. Further, Patent Document 2 describes a power storage device module in which a compensation material made of an open cell material is disposed between two cells.

JP, 2009-81056, A Japanese Patent Publication No. 2013-510411 gazette

  In the power storage device module as described in Patent Document 1, the power storage device repeats expansion and contraction by repeating charging and discharging. Expansion and contraction of the power storage device are absorbed by the rubber member. However, when the rubber member is compressed and remains in a crushed state, the rubber member can not absorb expansion and contraction of the power storage device. In order to prevent such a defect, it is conceivable to configure the rubber member with an open-cell material as described in Patent Document 2. However, the open cell material has good water absorbability and water can easily enter. If water enters the inside of the rubber member, the elastic properties of the rubber member will be affected.

  An object of the present invention is to provide a power storage device module and a power storage device pack capable of preventing the rubber member from being in a crushed state and preventing water from entering the inside of the rubber member.

  A power storage device module according to one aspect of the present invention includes a plurality of power storage devices arranged in one direction, a pair of restraint members for restraining the plurality of power storage devices from both sides in the arrangement direction of the storage devices, a restraint member, and charge storage. And a rubber member disposed between the device and absorbing expansion of the power storage device, the rubber member being disposed so as to cover the main body and the main body made of rubber having an open cell structure, and waterproof And a cover portion.

  In such a power storage device module, when the main body of the rubber member is made of rubber having an open cell structure, the elastic force of the rubber facilitates recovery of the main body even if the main body is compressed. Therefore, the rubber member is prevented from being crushed. Further, by disposing the waterproof cover portion so as to cover the main body portion, it is possible to prevent water from entering the inside of the rubber member.

  The cover portion may be made of rubber having a closed cell structure. The closed cell structure is a structure having extremely low water absorption. Therefore, the entry of water into the rubber member is reliably prevented.

  The cover may be made of waterproof paint. Also in this case, the entry of water into the rubber member is reliably prevented. Also, the cover can be made thinner.

  The main body portion has two main surfaces respectively facing the restraint member and the storage device, and four side surfaces adjacent to the two main surfaces, and the cover portion is disposed so as to cover the four side surfaces. Good. The two main surfaces of the main body portion are sandwiched between the restraint member and the power storage device. For this reason, water hardly enters the inside of the main body from the main surface of the main body. Therefore, the cover part should just be arrange | positioned so that four side surfaces of a main-body part may be covered. In this case, the area of the cover can be reduced.

  A storage battery pack according to another aspect of the present invention includes the above-described storage battery module and a case for storing the storage battery module.

  In such a storage battery pack, by including the above-described storage battery module, as described above, the rubber member is prevented from being in a crushed state and water enters the inside of the rubber member. Is prevented.

  According to the present invention, it is possible to provide an electric storage device module and an electric storage device pack capable of preventing the rubber member from being in a crushed state and preventing water from entering the inside of the rubber member.

It is an upper view top view which shows a battery module as an electrical storage apparatus module which concerns on one Embodiment. It is a perspective view of the battery unit shown by FIG. It is a front view of the rubber member shown by FIG. FIG. 2 is a cross-sectional view schematically showing an initial state and a compressed state of a rubber having an open cell structure and a rubber having a closed cell structure. It is a front view which shows the modification of the rubber member shown by FIG.

  Hereinafter, embodiments of the present invention will be described in detail with reference to the drawings. In the drawings, the same or equivalent elements will be denoted by the same reference symbols, without redundant description.

  FIG. 1 is a top plan view showing a battery module as a power storage device module according to one embodiment. In FIG. 1, a battery module 1 which is a power storage device module of the present embodiment is included in a battery pack 2 which is a power storage device pack. The battery pack 2 includes a battery module 1 and a case 3 made of metal (for example, iron) that accommodates the battery module 1.

  The battery module 1 includes a battery unit group 5 composed of a plurality of (seven in this case) battery units 4 and a pair of end plates 6 arranged on both sides of the battery unit group 5. The battery module 1 is attached to the inner wall surface of the rear wall of the case 3 so as to be cantilevered via each end plate 6.

  The plurality of battery units 4 are arranged in one direction. The battery unit 4 has the secondary battery 7 which is an electrical storage apparatus, and the battery holder 8 which hold | maintains this secondary battery 7, as FIG. 2 also shows. Therefore, the plurality of secondary batteries 7 are arranged in one direction. In the present embodiment, the secondary battery 7 is a lithium ion secondary battery. The secondary battery 7 has a rectangular parallelepiped shape. Although not particularly shown, the secondary battery 7 includes an electrode assembly and a case for housing the electrode assembly. An electrolyte is filled in the case.

  The positive electrode terminal 9 and the negative electrode terminal 10 are provided on the top of the secondary battery 7. The two adjacent secondary batteries 7 are arranged such that the positive electrode terminal 9 and the negative electrode terminal 10 are in opposite directions to each other. The positive electrode terminal 9 and the negative electrode terminal 10 of two adjacent secondary batteries 7 are connected via the bus bar 11.

  The battery holder 8 is made of resin. The battery holder 8 has a frame portion 12 in which the secondary battery 7 is fitted and accommodated. At the upper part of the frame portion 12, two bolt guide portions 13 having bolt insertion holes 13a into which screw portions 15a of bolts 15 described later are inserted are provided. At the lower part of the frame portion 12, two bolt guide portions 14 having bolt insertion holes 14a through which the screw portions 15a of the bolts 15 are inserted are provided.

  The end plate 6 is a restraint member that restrains the secondary batteries 7 of the plurality of battery units 4 from both sides in the arrangement direction of the secondary batteries 7 by four sets of bolts 15 and nuts 16. The end plate 6 is made of a rigid metal (for example, iron). The restraint load of the secondary battery 7 by the end plate 6 is, for example, 7 kN to 8 kN.

  A rubber member 17 is disposed between one end plate 6 and the secondary battery 7 of the battery unit 4 positioned on one end side of the plurality of battery units 4. The rubber member 17 is a member that receives the restraint load of the secondary battery 7 by the end plate 6 and absorbs expansion of the secondary battery 7. The rubber member 17 is fixed to the intermediate plate 18. The rubber member 17 is disposed adjacent to the end plate 6 at a height position corresponding to the secondary battery 7. The intermediate plate 18 is disposed adjacent to the secondary battery 7.

  The rubber member 17 has a rectangular parallelepiped shape (a rectangular shape in plan view). As shown in FIG. 3, the rubber member 17 has a main body 19 having a rectangular shape in a plan view, and a cover 20 which is disposed to cover the main body 19 and has waterproofness.

  The main body portion 19 has two main surfaces 19 a facing the secondary battery 7 and the end plate 6 respectively, and four side surfaces 19 b adjacent to the main surfaces 19 a. The side surface 19 b is a surface perpendicular to the major surface 19 a. The main surface 19 a is a surface perpendicular to the direction in which the secondary batteries 7 are arranged. The side surface 19 b is a surface parallel to the arrangement direction of the secondary batteries 7. The cover portion 20 is arranged to cover the four side surfaces 19 b. The two main surfaces 19 a are exposed without being covered by the cover 20.

  The main body portion 19 is composed of a rubber (hereinafter, open-cell rubber) 21 having an open-cell structure as shown in FIG. 4A. The open cell rubber 21 is a rubber in which adjacent air bubbles B are in communication (continuous) with each other. In the open cell rubber 21, the plurality of air bubbles B communicate with the atmosphere outside the rubber. For this reason, the open-cell rubber 21 is excellent in water absorption and air permeability, and allows water and air to pass therethrough. Examples of such open cell rubber 21 include urethane rubber.

  The cover part 20 is comprised from rubber | gum (following, closed-cell rubber) 22 which has a closed-cell structure as is shown by FIG.4 (b). The closed cell rubber 22 is a rubber which is completely independent without the air bubbles B communicating with each other. The closed cell rubber 22 has extremely low water absorption and air permeability, and is impermeable to water and air. Examples of such closed cell rubber 22 include ethylene propylene diene rubber (EPDM).

  As described above, the main body portion 19 and the cover portion 20 are both made of a rubber material. The cover 20 is bonded to each side 19 b so as to surround the four sides 19 b of the main body 19.

  By the way, the secondary battery 7 repeats expansion and contraction by repeating charge and discharge. Expansion and contraction of the secondary battery 7 are absorbed by the rubber member 17. The rubber member 17 must deform in response to the expansion and contraction cycles of the secondary battery 7.

  Here, in the case where the rubber member 17 is constituted only of the closed cell rubber 22 as shown in FIG. 4B, the following problems occur. That is, the compressive force of the closed cell rubber 22 is determined by the elastic force of the closed cell rubber 22 and the elastic force of air passing through the air bubble B. In the initial state of the closed cell rubber 22, air passes through the air bubble B. However, when the closed air bubble rubber 22 is compressed, the air bubble B collapses so that the elastic force of air hardly acts and the elastic force of the closed air rubber 22 The closed-cell rubber 22 will be restored only by. Therefore, the closed cell rubber 22 does not return to its original initial state and remains crushed. When the secondary battery 7 contracts in a state in which the closed cell rubber 22 remains crushed, the load of the closed cell rubber 22 is not applied to the secondary battery 7, and therefore lithium in the secondary battery 7 may be deposited.

  On the other hand, in the case where the rubber member 17 is constituted only by the open-cell rubber 21 as shown in FIG. 4A, the following problems occur. That is, the compression force of the open cell rubber 21 is determined only by the elastic force of the open cell rubber 21. For this reason, even if the open-cell rubber 21 is compressed, the restoring force of the open-cell rubber 21 works, so the open-cell rubber 21 returns to the original initial state. Thereby, the open cell rubber 21 deforms in response to the expansion and contraction of the secondary battery 7. However, since the open-celled rubber 21 is excellent in water absorption as described above, water can easily enter. When water enters the open cell rubber 21, the elastic properties of the open cell rubber 21 are affected.

  On the other hand, in the present embodiment, the rubber member 17 has the main body 19 made of the open-celled rubber 21 and the cover 20 which is disposed so as to cover the main body 19 and is waterproof. . As described above, since the main body 19 of the rubber member 17 is formed of the open cell rubber 21, even if the main body 19 is compressed, the elastic force of the open cell rubber 21 facilitates the restoration of the main body 19. Therefore, the rubber member 17 can be prevented from being in a crushed state. As a result, since the load of the rubber member 17 is reliably applied to the secondary battery 7, the deposition of lithium in the secondary battery 7 can be prevented. Further, since the waterproof cover portion 20 is disposed so as to cover the main body portion 19, entry of water into the rubber member 17 can be prevented. This makes it possible to maintain the elastic properties of the rubber member 17.

  Moreover, since the cover part 20 is comprised with the closed cell rubber 22 with very low water absorbency, the penetration of the water to the inside of the rubber member 17 can be prevented reliably. Further, since the cover portion 20 may be adhered to the main body portion 19, the time and effort required for manufacturing the rubber member 17 can be reduced.

  Furthermore, since the cover 20 is arranged to cover the four side surfaces 19 b of the main body 19, the area of the cover 20 can be reduced. Thereby, the effort concerning manufacture of the rubber member 17 can be further reduced. In addition, since the two main surfaces 19a of the main body 19 are in contact with the intermediate plate 18 and the end plate 6, respectively, the main surfaces 19a of the main body 19 are not covered by the cover 20. Water hardly enters the inside of the main body portion 19.

  FIG. 5 is a front view showing a modification of the rubber member 17 shown in FIG. In FIG. 5, the rubber member 17 of this modification has a cover 30 in place of the cover 20 described above. The cover 30 is disposed so as to cover the four side surfaces 19 b of the main body 19. The cover 30 is made of waterproof paint. Examples of the waterproof paint include acrylic resin and urethane resin. The cover 30 is formed by applying a waterproof paint to the four side surfaces 19 b of the main body 19.

  Thus, since the cover part 30 is comprised with a waterproof paint, the penetration of the water to the inside of the rubber member 17 can be prevented reliably. In addition, the thickness of the cover 30 can be reduced.

  The present invention is not limited to the above embodiment. For example, in the above embodiment, the cover portion 20 or the cover portion 30 is disposed so as to cover only the four side surfaces 19b of the main body portion 19, but the structure of the rubber member 17 is not particularly limited thereto. 20 or the cover part 30 may be arrange | positioned so that the whole surface of the main-body part 19, ie, four side surfaces 19b and two main surfaces 19a, may be covered.

  Although the rubber member 17 has a rectangular shape in a plan view in the above embodiment, the shape of the rubber member 17 is not particularly limited thereto. For example, the rubber member 17 may have a circular shape in a plan view. In this case, the cover 20 or the cover 30 is disposed to cover at least the circumferential surface of the main body 19.

  Furthermore, in the above embodiment, the power storage device of the power storage device unit is a secondary battery such as a lithium ion secondary battery, but the present invention is not particularly limited to such a secondary battery, for example, an electric double layer capacitor or The present invention is also applicable to a power storage device module and a power storage device pack provided with a power storage device such as a lithium ion capacitor.

  Reference Signs List 1 battery module (power storage device module), 2 battery pack (power storage device pack), 6 end plate (restraint member), 7 secondary battery (power storage device), 17 rubber member, 19 main portion, 19a Main surface, 19b: Side surface, 20: Cover portion, 30: Cover portion.

Claims (5)

A plurality of power storage devices arranged in one direction;
A pair of restraining members for restraining the plurality of power storage devices from both sides in the arrangement direction of the power storage devices;
And a rubber member disposed between the restraint member and the power storage device and absorbing expansion of the power storage device.
The rubber member includes a main body portion comprised of rubber having an open cell structure is arranged so as to cover the main body portion, have a cover portion having a waterproof, the body portion, the restraining member and the It has two main surfaces respectively facing a power storage device and four side surfaces adjacent to the two main surfaces,
The said cover part is arrange | positioned so that the said 4 side may be covered, The electrical storage apparatus module characterized by the above-mentioned. A plurality of power storage devices arranged in one direction;
A pair of restraining members for restraining the plurality of power storage devices from both sides in the arrangement direction of the power storage devices;
And a rubber member disposed between the restraint member and the power storage device and absorbing expansion of the power storage device.
The rubber member has a main body portion made of rubber having an open cell structure, and a cover portion which is disposed so as to cover the main body portion and has waterproof properties, and the main body portion includes the restraining member and the restraining member. A storage device, two main surfaces facing each other, and a circumferential surface adjacent to the two main surfaces,
The said cover part is arrange | positioned so that the whole surrounding surface may be covered, The electrical storage apparatus module characterized by the above-mentioned . The cover portion, the power storage module according to claim 1 or 2, wherein by being composed of a rubber having a closed cell structure. The said cover part is comprised from waterproof paint, The electrical storage apparatus module of Claim 1 or 2 characterized by the above-mentioned. The power storage device module according to any one of claims 1 to 4.
And a case for housing the power storage device module.

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