JP5131055B2 - Assembled battery device and retaining member for assembled battery device - Google Patents

Description

  The present invention relates to an assembled battery device in which a plurality of unit cells each having a rectangular parallelepiped shape are arranged, and a holding member for the assembled battery device.

  Nickel / hydrogen secondary batteries, lithium ion secondary batteries, and the like used as drive power sources for electric vehicles are required to have a high energy density and are required to have a small mounting space. Therefore, it is common to use a battery pack in which a plurality of single battery cells are assembled. For example, several tens to several tens of V single battery cells having a rectangular parallelepiped shape are connected in series, and these are put in one package to form an assembled battery. This assembled battery is mounted, for example, in the lower part of the rear seat, the trunk room, or the like.

  By the way, the performance and life of the assembled battery greatly depend on the temperature environment, and the deterioration is remarkable at a high temperature. Therefore, a cooling passage communicating with the atmosphere is formed on the surface of the single battery cell, and air in the passenger compartment is introduced into the cooling passage, or the air from the air conditioner is forcibly introduced.

  On the other hand, in a nickel-hydrogen secondary battery or the like, it is inevitable that the unit cell having a rectangular parallelepiped shape expands during charging and the widest side surface expands outward in an arc shape. If it becomes like this, in the assembled battery which assembled | stacked the single battery cell which makes a rectangular parallelepiped shape, the wall surfaces which oppose may contact in a small contact area, and a big stress may concentrate on a contact part.

  Therefore, for the purpose of uniforming the internal pressure of each single battery cell and making the charge / discharge characteristics of each single battery cell uniform, the single battery cells are arranged in a state in which a predetermined load is applied and restrained under pressure. ing. For example, in the assembled battery device introduced in Japanese Patent Application Laid-Open No. 2001-313018, a plurality of unit cells are arranged in the thickness direction, and one constraining plate is stacked on each end in the thickness direction. The two restraining plates are tightened in the direction approaching each other by the restraining rod. By tightening the two restraining plates in a direction approaching each other, the plurality of single battery cells are brought into close contact with each other, and the expansion can be regulated by applying a load to each single battery cell.

  However, in the above assembled battery device, there is a problem that the single unit cell at the center part is less likely to dissipate heat than the single unit cell at the end. Thus, if there is a difference in the cooling characteristics between the single battery cells, the output and life of each single battery cell will vary, resulting in the output of the assembled battery device becoming unstable and shortening the life. End up.

  Japanese Patent Laid-Open No. 2007-012486 proposes an assembled battery device in which the upper part of a plurality of single battery cells is housed in a sealed battery chamber and the lower part of each single battery cell is exposed to a cooling chamber. According to this assembled battery device, each single battery cell can be uniformly cooled by circulating cooling air or the like in the cooling chamber.

  Japanese Patent Application Laid-Open No. 07-045310 discloses that a heat pipe is disposed in the vicinity of each single battery cell, and an end portion of the heat pipe is engaged with a heat radiating plate to radiate heat of the single battery cell to the outside. An assembled battery device as described above has been proposed.

  However, these assembled battery devices have a complicated structure and thus become large and have problems in terms of space and cost.

Therefore, as shown in FIG. 10, a plurality of rows are alternately arranged such that spacers 901 are interposed between the single battery cells 900, and the widest side surfaces of the adjacent single battery cells 900 are opposed to each other via the spacers 901. In other words, a restraint plate 902 is disposed at both ends and restrained in the row direction by a restraint rod or the like (see, for example, JP-A-2006-048996). In this assembled battery device, a space 904 having a height of 1 to 2 mm is formed between the single battery cell 900 and the spacer 901 by forming the rib 903 on the spacer 901. Therefore, even when the unit cell 900 is expanded, it is possible to prevent interference between the opposing wall surfaces. Further, the battery cell 900 can be cooled by circulating a cooling medium such as air in the space 904. Thereby, the cooling characteristic between each single battery cell 900 can be equalize | homogenized, and lifetime can be lengthened.
JP 2001-313018 Japanese Patent Laid-Open No. 07-045310 JP 2007-012486 A JP 2006-048996 A

  However, in the assembled battery device described in Patent Document 4, dust or the like may accumulate in the space 904, which makes uniform cooling difficult and causes a difference in the cooling characteristics of the individual battery cells. In addition, air from an air conditioner is generally used as the cooling medium, but condensation may occur in the space 904 due to a temperature difference from the outside air, and it can be said that there is no possibility of leakage due to water droplets moving to the electrode part. Absent.

  Therefore, the applicant of the present application has proposed an assembled battery device in which a sheet made of a soft material having high thermal conductivity, such as silicone rubber, is sandwiched between single battery cells in Japanese Patent Application No. 2007-219812. According to this battery device, when the pressure is restrained from both ends in the row direction, the soft sheet is compressed by the single battery cells on both sides and is in close contact with the widest surface of the single battery cells. Thereby, the heat of the single battery cell is conducted from the sheet to the heat radiating surface and radiated to the heat radiating space.

  That is, since there is no gap between the single battery cell and the sheet, the problem of dust accumulation in the conventional space 904 does not occur. Therefore, even after long-term use, the cooling conditions for each single battery cell are almost the same, so that the cooling characteristics between the single battery cells can be made uniform, and the life is prolonged.

  Furthermore, it is not necessary to form a space for circulating cooling air as described in Patent Document 3 between the single battery cells. Therefore, the distance between single battery cells can be reduced, and the whole becomes a compact shape, and the mounting space can be reduced. Further, if the heat dissipating surface is formed at a position far from the electrode, it is possible to prevent leakage due to condensation.

  However, when assembling a battery assembly by arranging a plurality of unit cells, it is necessary to easily and accurately determine the relative positions of the plurality of unit cells arranged in a row. It was. Further, there is room for suppressing the relative movement between the adjacent unit cells arranged in a row and improving the problems of the assembled battery device such as the electrode connection position shift and the connection failure due to the relative movement between the unit cells.

  The present invention has been made in view of the above circumstances, and in an assembled battery device in which unit cells are arranged in a row, the cooling characteristics of each unit cell are made uniform, and problems such as electric leakage due to dust accumulation and condensation are prevented. An object to be solved is to provide an assembled battery device and a holding member for the assembled battery device that prevent and have high assembly workability and stability.

  [1] The assembled battery device of the present invention includes a unit cell (1) having a rectangular parallelepiped shape, and a heat conductive member (2) formed in a plate shape from a soft material having thermal conductivity and electrical insulation. A plurality of cap-like holding members (6), which are alternately arranged in close contact with each other and are respectively covered on the end portions (130) constituting the short sides of the plurality of single battery cells (1), are mounted. The battery assembly is configured to be pressure-constrained from both ends in the direction, and the holding member (6) is formed on one surface of the plate-like base (61) and the base (61), and the single battery cell (1) A pair of first planes (611) that contact a pair of side surfaces (10) that constitute the widest surface of the cell, and a pair of first planes (11) that contact a pair of side surfaces (11) that constitute the long side of the unit cell (1) Two planes (612) and a third plane (613) facing the side surface (13) constituting the short side of the single battery cell (1) A holding recess (62) for receiving the end portion (130), and the holding member (6) brings the holding member (6) adjacent in the row direction close to the heat conducting member (2). It further has a restricting portion that restricts the amount of bending to a predetermined value when the wire is bent.

  According to the assembled battery device of the present invention, by using the holding member, it is possible to easily arrange a plurality of single battery cells in parallel and to improve the assembling workability of the assembled battery device. In addition, by providing the holding member with a restricting portion, when the holding member adjacent in the row direction is brought closer and the heat conduction member between the unit cells adjacent in the row direction is bent, the amount of bending is reduced. It can be regulated to a predetermined value. That is, the compression amount of the heat conducting member can be regulated.

  [2] The holding member (6) of the assembled battery device of the present invention includes a convex first engaging portion (63) formed on the base portion (61) and a concave symmetrical with the first engaging portion (63). A plurality of holding members, each of the first engaging portions (63) is engaged with the second engaging portion (64) of the adjacent holding member. It is preferable that they can be integrated in parallel.

  By providing the holding member with the first engaging portion and the second engaging portion, it is possible to more easily arrange a plurality of unit cells in parallel and to improve the assembly workability of the assembled battery device. To do.

  [3] At least one of the first engaging portion (63) and the second engaging portion (64) of the assembled battery device of the present invention has a first plane (611) between adjacent holding members when aligned, and A first restricting portion (65A, 65B, 65a, 65b) for restricting relative movement in a direction parallel to the third plane (613), and a second restricting portion (66A, 66a) for restricting the interval between adjacent holding members. It is preferable to have.

  By providing the first restricting portion and the second restricting portion on at least one of the first engaging portion and the second engaging portion, it is possible to suppress relative movement between the unit cells arranged in parallel in an integrated manner. Can do. Problems such as electrode connection position shift and connection failure due to relative movement between unit cells are reliably improved.

  [4] It is preferable that the restriction part of the assembled battery device of the present invention includes the second restriction part (66A, 66a).

  As a result, the spacing between adjacent holding members (single battery cells) can be regulated more reliably, and the holding members adjacent in the row direction can be brought closer to each other so that the unit cells adjacent in the row direction can be spaced apart. When the heat conducting member is bent, the amount of bending can be regulated to a predetermined value. That is, the amount of compression of the heat conducting member can be more reliably regulated.

  [5] The third plane (613) of the assembled battery device of the present invention is in contact with the side surface (13) constituting the short side of the single battery cell (1), and the first engaging portion (63) and the second engaging portion. At least one of the portions (64) is a third restricting portion (67A, 67a) that restricts the relative movement of the adjacent holding members adjacent to each other in the direction parallel to the first plane (611) and the second plane (612). ).

  By providing the third restricting portion in at least one of the first engaging portion and the second engaging portion, it is possible to further suppress the relative movement between the single battery cells arranged in parallel in an integrated manner. Problems such as electrode connection position shift and connection failure due to relative movement between single battery cells are more reliably improved.

  [6] In the holding member (6) of the assembled battery device of the present invention, the thickness of the side wall constituting the first plane (611) is smaller than ½ of the thickness of the plate-like heat conducting member (2). It is preferable.

  By setting the thickness of the side wall of the holding member to be smaller than ½ of the thickness of the heat conduction member, the plate-like heat conduction member can be reliably sandwiched between the single cells, and the heat conduction Adhesion between the widest surface of the member and the widest surface of the unit cell is improved. At the same time, the amount of compression of the heat conducting member can be regulated.

  [7] The battery pack holding member of the present invention includes a unit cell (1) having a rectangular parallelepiped shape, and a heat conductive member (2) formed in a plate shape from a soft material having thermal conductivity and electrical insulation. Are used in an assembled battery device that is alternately arranged in close contact with each other and is pressure-constrained from both ends in the arrangement direction, and constitutes the short sides of the plurality of single battery cells (1). A cap-shaped battery assembly holding member that is respectively covered on the end portion (130), formed on one surface of a plate-like base portion (61) and a base portion (61) of the single battery cell (1) A pair of first planes (611) that contact a pair of side surfaces (10) that constitute the widest surface, and a pair of second surfaces that abut a pair of side surfaces (11) that constitute the long side of the unit cell (1). The third plane (6) facing the plane (612) and the side surface (13) constituting the short side of the single battery cell (1) 3), an accommodating recess (62) for accommodating the end (130), a convex first engaging portion (63) formed on the base (61), and a first engaging portion (63) And a second engaging portion (64) having a concave shape that is symmetrical with the second engaging portion (64) of the holding member adjacent to each of the first engaging portions (63). The first engaging portion (63) and the second engaging portion (64) can be arranged in parallel by being engaged with each other, and at least one of the first engaging portion (63) and the second engaging portion (64) is the first plane (611) between the holding members adjacent to each other. And the 1st control part (65A, 65B, 65a, 65b) which controls the relative movement of a 3rd plane (613) and a parallel direction, and the 2nd control part (66A, 66a) which controls the space | interval of adjacent holding members. It is characterized by having.

  According to the battery pack holding member of the present invention, the cap-shaped holding member is respectively covered on the end portion constituting the short side of the single battery cell, and the first engaging portion formed between the adjacent holding members, By engaging the second engagement portion, the battery cells held by the holding member can be easily arranged in parallel and the assembling workability of the assembled battery device is improved. Further, by providing the holding member with the first restricting portion and the second restricting portion, the relative movement of the holding members in the direction parallel to the first plane and the third plane (the relative movement of the unit cells in the height direction) and The interval between adjacent holding members (intervals between single battery cells) can be restricted, and relative movement between the single battery cells arranged in parallel in an integrated manner can be suppressed. Further, it is possible to improve problems such as electrode connection position shift and connection failure due to relative movement between single battery cells. Furthermore, the amount of compression of the heat conducting member can be regulated by regulating the interval between adjacent holding members by the second regulating part, and the heat dissipation of the assembled battery device is stabilized.

  [8] The third plane (613) of the holding member for the assembled battery device of the present invention is in contact with the side surface (13) constituting the short side of the unit cell (1), and the first engaging portion (63) and the first At least one of the two engaging portions (64) is a third restricting portion that restricts relative movement in the direction parallel to the first plane (611) and the second plane (612) between the holding members adjacent to each other when they are arranged in parallel. 67A, 67a).

  According to the holding member for an assembled battery device of the present invention, by providing the holding member with the third restricting portion, it is possible to restrict relative movement of adjacent holding members in the direction parallel to the first plane and the second plane. Further, the relative movement between the unit cells arranged in a row can be further suppressed, and problems such as electrode connection position shift and connection failure due to the relative movement between the unit cells can be further improved.

  The symbols used in [Claims] and [Means for Solving the Problems] are for easy understanding of the configuration of the present invention, and are not limited to the embodiments.

  According to the assembled battery device of the present invention, by using the holding member, it is possible to easily arrange a plurality of single battery cells in parallel and to improve the assembling workability of the assembled battery device. In addition, by providing the holding member with a restricting portion, when the holding member adjacent in the row direction is brought closer and the heat conduction member between the unit cells adjacent in the row direction is bent, the amount of bending is reduced. It can be regulated to a predetermined value. That is, the compression amount of the heat conducting member can be regulated.

  According to the battery pack holding member of the present invention, the cap-shaped holding member is respectively covered on the end portion constituting the short side of the single battery cell, and the first engaging portion formed between the adjacent holding members, By engaging the second engagement portion, the battery cells held by the holding member can be easily arranged in parallel and the assembling workability of the assembled battery device is improved. Further, by providing the holding member with the first restricting portion and the second restricting portion, the relative movement of the holding members in the direction parallel to the first plane and the third plane (the relative movement of the unit cells in the height direction) and The interval between adjacent holding members (intervals between single battery cells) can be restricted, and relative movement between the single battery cells arranged in parallel in an integrated manner can be suppressed. Further, it is possible to improve problems such as electrode connection position shift and connection failure due to relative movement between single battery cells. Furthermore, the amount of compression of the heat conducting member can be regulated by regulating the interval between adjacent holding members by the second regulating part, and the heat dissipation of the assembled battery device is stabilized.

  Further, since there is no gap between the single battery cell and the heat conducting member, the problem of dust accumulation in the conventional space 904 does not occur. Therefore, even after long-term use, the cooling conditions for each single battery cell are almost the same, so that the cooling characteristics between the single battery cells can be made uniform, and the life is prolonged.

  Furthermore, since the exhaust heat of the single battery cells can be efficiently released by providing the heat conducting member, the distance between the single battery cells can be reduced. Therefore, the whole becomes a compact shape and the mounting space can be reduced. In addition, when the heat conducting member is exposed and installed in the cooling passage so that heat can be transferred, heat exchange is performed in the cooling passage. Electric leakage can also be prevented.

  The assembled battery device of the present invention is suitably used as a power supply device for electric vehicles, hybrid vehicles, and the like. Moreover, the holding member for assembled battery devices of this invention is used suitably for the assembly operation at the time of assembling an assembled battery device from a single battery cell. Hereinafter, the holding member for an assembled battery device of the present invention will be described as a part of the configuration of the assembled battery device of the present invention.

  The assembled battery device of the present invention includes a single battery cell, a heat conducting member, and a holding member.

  Specifically, in the battery pack device of the present invention, a single battery cell having a rectangular parallelepiped shape and a heat conductive member formed in a plate shape from a soft material having thermal conductivity and electrical insulation are in close contact with each other. A plurality of rows are alternately arranged. Cap-shaped holding members that are respectively covered on the ends constituting the short sides of the plurality of unit cells are mounted. The plurality of unit cells held by the holding member are restrained by pressure from both ends in the arrangement direction.

  The holding member includes a plate-like base and an accommodation recess that accommodates an end that is formed on one surface of the base and forms the short side of the single battery cell.

  The housing recess includes a pair of first planes that contact a pair of side surfaces that constitute the widest surface of the single battery cell, a pair of second planes that contact a pair of side surfaces that constitute the long side of the single battery cell, It has the 3rd plane facing the side which constitutes the short side of a battery cell.

  Furthermore, the holding member has a restricting portion that restricts the amount of bending to a predetermined value when the holding members adjacent in the row direction are brought close to each other and the heat conducting member is bent.

  By using the holding member in the assembled battery device, the unit cells held by the holding member can be easily and integrally arranged in parallel, and the assembly workability of the assembled battery device is improved.

  Further, by providing the holding member with the restricting portion, it is possible to suppress relative movement (for example, relative movement in the arrangement direction) between the single battery cells arranged in parallel in an integrated manner. Therefore, when the holding members adjacent in the row direction are brought close to each other and the heat conducting member is bent, the bending amount can be restricted to a predetermined value, and the compression amount of the heat conducting member can be restricted.

  The holding member can be made of a resin material such as polypropylene (PP) resin. Further, it is desirable that the holding member has electrical insulation.

  In the assembled battery device of the present invention, it is desirable that the holding member includes a first engagement portion and a second engagement portion.

  The first engaging portion is formed on the base portion as a convex shape. The second engaging portion is formed in the base as a concave shape symmetrical to the first engaging portion. In addition, the plurality of holding members can be integrated in parallel by engaging each first engaging portion with the second engaging portion of the adjacent holding member. For this reason, the unit cells held by the holding member can be easily and integrally arranged in parallel, and the assembly workability of the assembled battery device is improved.

  In addition, at least one of the first engaging portion and the second engaging portion is a first restricting portion that restricts relative movement in a direction parallel to the first plane and the third plane between adjacent holding members when arranged in parallel. And a second restricting portion for restricting the interval between adjacent holding members.

  By providing the holding member with the first restricting portion, the relative movement of the holding members in the direction parallel to the first plane and the third plane can be suppressed, and the first planes of the single battery cells held by the holding member. In addition, relative movement in the direction parallel to the third plane can be suppressed. Further, by providing the holding member with the second restricting portion, it is possible to restrict the interval between the adjacent holding members.

  Thereby, malfunctions, such as electrode connection position shift by the relative movement between single battery cells, and a connection defect, can be improved. Furthermore, the amount of compression of the heat conducting member can be regulated by regulating the interval between adjacent holding members by the second regulating part, and the heat dissipation of the assembled battery device is stabilized.

  Further, the third plane of the holding member is in contact with the side surface constituting the short side of the unit cell, and at least one of the first engaging portion and the second engaging portion is located between adjacent holding members when they are juxtaposed. It is desirable to have a third restricting portion that restricts relative movement in the direction parallel to the first plane and the second plane. By providing the holding member with the third restricting portion, it is possible to restrict the relative movement in the direction parallel to the first plane and the second plane between the adjacent holding members, and the relative movement between the arranged unit cells. Can be further suppressed. Problems such as electrode connection position shift and connection failure due to relative movement between single battery cells can be further improved.

  Moreover, it is desirable that the holding member of the assembled battery device of the present invention is set such that the thickness of the side wall constituting the first plane is smaller than ½ of the thickness of the plate-like heat conducting member.

  By setting the thickness of the side wall of the holding member to be smaller than ½ of the thickness of the heat conduction member, the plate-like heat conduction member can be reliably sandwiched between the single cells, and the heat conduction Adhesion between the widest surface of the member and the widest surface of the unit cell is improved.

  In the assembled battery device of the present invention, a plurality of battery cells and plate-like heat conducting members are in close contact with each other, and a plurality of rows are alternately arranged, and the assembled battery members are pressed and restrained from both ends in the arrangement direction. Can be configured.

  In the assembled battery device of the present invention, the assembled battery member can be provided with a cooling passage.

  Specifically, the cooling passage is formed in a tunnel shape in contact with one surface of the assembled battery member, and the refrigerant is circulated therein. At least a part of the heat conducting member is exposed inside the cooling passage, and the heat conducting member can exchange heat with the refrigerant in the cooling passage through the exposed portion. The partition wall that partitions the cooling passage from the outside is preferably a heat insulating wall.

  As the heat insulating wall, it is desirable to use a heat insulating material having a thermal conductivity of 0.5 W / m · K or less. Among heat insulating materials, generally a resin having a thermal conductivity of 0.2 W / m · K or less (for example, a polyethylene resin or a polypropylene resin), or a resin having a lower thermal conductivity of 0.02 W / m · K or less. A foam (for example, a polyethylene resin foam, a polypropylene resin foam) or the like is preferably used.

  Since the partition wall of the cooling passage has a heat insulating property, the refrigerant flowing through the cooling passage is thermally protected from the outside. Therefore, the influence from an external heat source (for example, exhaust heat of a car) is reduced. It becomes easy to manage the refrigerant temperature in the cooling passage. Since the temperature difference during heat exchange can be kept large and stable, the heat from the single battery cell can be efficiently released.

  In the assembled battery device of the present invention, cooling air (cooling air) from an air conditioner can be used as the refrigerant. In addition to the cooling air, it is also possible to use a cooling oil having electrical insulation.

  In the assembled battery device of the present invention, a general so-called prismatic battery cell can be used as the single battery cell. You may use one with a resin casing, or one with an insulating coating on the surface, but use a single battery cell that exposes a metal casing such as iron or aluminum with high thermal conductivity. It is preferable. In general, a pair of electrodes project from the upper part of the unit cell. Usually, a plurality of unit cells are arranged in a row so that the sides having the electrodes are all the same side.

  A heat conductive member consists of a soft material which has heat conductivity and electrical insulation.

  The heat conducting member can be composed of a matrix substrate and a fiber member contained in the matrix substrate. The matrix substrate corresponds to a soft material. The heat conducting member is formed in a plate shape. Here, the degree of softness in the matrix base material constituting the heat conducting member is desirably 50 or less in Asker C hardness. By setting the Asker C hardness to a softness of 50 or less, sufficient adhesion with the widest side surface of the single battery cell can be secured, and the heat of the single battery cell can be efficiently radiated. The Asker C hardness is a rubber hardness defined by the Japan Rubber Association standard SRIS 0101 and corresponds to a Shore hardness E defined by JIS K 6253. The matrix base material preferably has a thermal conductivity of 5 W / m · K or more. If the thermal conductivity is lower than this, the heat dissipation becomes low, which is not preferable.

  As a material for the matrix base material having the above-described properties, for example, a thermoplastic elastomer such as silicone rubber can be used. Silicone rubber has both thermal conductivity and high electrical insulation, and is soft with an Asker C hardness of about 2-45. General rubber and thermoplastic elastomers cannot be used because they are too low in thermal conductivity as they are, but there is a possibility that they can be used by mixing high thermal conductive materials such as alumina, boron nitride, silicon nitride, and silica. is there.

  The fiber member preferably has a thermal conductivity of 10 W / m · K or more in the longitudinal direction of the fiber. The material of such a fiber member includes an ultrahigh molecular weight polyethylene fiber having a thermal conductivity of about 60 W / m · K in the longitudinal direction of the fiber, a carbon fiber having the same thermal conductivity of about 540 W / m · K, and the same heat. Aluminum fiber with a conductivity of about 240 W / m · K, alumina fiber with a thermal conductivity of about 1015 W / m · K, copper fiber with a thermal conductivity of about 400 W / m · K, and a thermal conductivity of about 300 Examples include aluminum nitride fibers of up to 400 W / m · K, titanium fibers having the same thermal conductivity of about 22 W / m · K, and boron nitride having the same thermal conductivity of about 250 W / m · K. Among them, an ultrahigh molecular weight polyethylene fiber having the same thermal conductivity of about 60 W / m · K is also a particularly preferable material because it has an electrical insulating property.

  Further, the fiber member can be composed of an aggregate of single fibers. Moreover, the direction along the direction toward the cooling passage is preferable as the orientation direction of the aggregate of single fibers. That is, even if the thermal conductivity of the single fiber is 10 W / m · K or more in the fiber length direction, it may be less than 10 W / m · K in the fiber radial direction. When a fiber member composed of an aggregate of single fibers is embedded in a matrix substrate, the single fiber aggregate that is conducted from the surface of the heat conducting member is oriented by orienting the aggregate of single fibers along the direction toward the cooling passage side. The exhaust heat of the battery cell is easily conducted along the orientation direction of the fiber member, and is concentrated on the cooling passage side while suppressing heat conduction (outflow) in directions other than the direction toward the cooling passage side. Heat can be transferred. Thereby, heat is efficiently transferred to the cooling passage side while suppressing the temperature rise in the environment surrounding the single battery cell, and heat dissipation is realized through the cooling passage. On the other hand, when a large amount of heat from the single battery cell flows in a direction other than the direction toward the cooling passage side, the temperature of the surrounding environment of the single battery cell rises, leading to deterioration of the single battery cell.

  Moreover, by embedding the fiber member in the matrix base material, the surface rigidity of the heat conducting member is increased, and the expansion of the single battery cell can be further suppressed.

  Moreover, it is desirable that the fiber member is contained in the heat conductive member in a range of 20 to 80% by volume. When the content of the fiber member is less than 20% by volume, the heat dissipation becomes insufficient. When the content is more than 80% by volume, the softness of the heat conducting member is lowered and the adhesiveness with the single battery cell is lowered. descend.

  In order to form the heat conducting member, it can be easily formed by injecting and press-molding a soft material such as silicone rubber in a molten state with the fiber member disposed in the mold. In this case, when forming the fiber member, a composite yarn composed of a single fiber having a thermal conductivity of 10 W / m · K or more in the length direction and a soft heat conductive resin layer coated on the surface of the single fiber is used. Is also preferable. If a soft heat conductive resin layer having high affinity with the matrix base material is used, the adhesion between the matrix base material and the fiber member is increased, and the heat dissipation is improved. In addition, if only a composite yarn consisting of a single fiber and a soft heat conductive resin layer coated on the surface of the single fiber is placed in a mold and press-molded, the soft heat conductive resin layer can be used as a matrix substrate. is there.

  However, as described above, when the heat conductive member is formed by press molding in which a soft material such as silicone rubber is injected, if the thermal conductivity of the silicone rubber is lower than that of the fiber member, the surface of the silicone rubber is transferred from the surface of the silicone rubber to the fiber member. There is a possibility that the amount of heat transfer is insufficient.

  Therefore, between the surface of the fiber member and the surface of the heat conducting member (or between the surfaces on both sides in the thickness direction of the heat conducting member), the thermal conductivity in the length direction is 10 W / m · K or more. It is desirable that the fiber length direction of the short fiber is embedded so as to be oriented in the thickness direction of the heat conducting member. If it does in this way, the heat transmitted from the single battery cell to the contact | adherence surface can be efficiently transferred to a fiber member via the short fiber oriented in the thickness direction, and heat dissipation is further improved.

  In order to form a heat conducting member with short fibers oriented in this way, a composite material in which short fibers are mixed with a soft material such as silicone rubber is formed. Then, when the fiber member is placed in the mold and the molten composite material is injected and molded, the molding is performed while applying a magnetic field in the thickness direction of the heat conducting member. Accordingly, the short fibers can be oriented in the fiber length direction parallel to the magnetic field direction and in the thickness direction of the heat conducting member.

  The material of the short fiber may be the same as that of the fiber member, or another material such as boron nitride that is easily oriented in the magnetic field direction may be used unlike the fiber member. Moreover, the shape of a short fiber can use not only a fibrous form but a scale-like thing. The content of the short fibers oriented in the thickness direction is preferably in the range of 20 to 60% by volume in the heat conducting member. If the content of the short fibers oriented in the thickness direction is less than 20% by volume, the above-mentioned effect is difficult to be obtained. Even if the content is more than 60% by volume, the effect is saturated and the rigidity of the heat conducting member becomes too high. As a result, the adhesiveness with the single battery cell is lowered and the heat dissipation is lowered.

  Moreover, you may form a heat conductive member in the bag shape which can accommodate a battery cell. If it does in this way, the laminated body of a single battery cell and a heat conductive member can be easily formed only by throwing a single battery cell in a bag-like heat conductive member.

  In addition, the surface of the heat conducting member that faces and closely contacts the single battery cell may be a convex spherical surface toward the single battery cell. In this way, when the pressure is restrained, the central portion of the spherical surface first comes into contact with the single battery cell, and as the area is compressed, the area of contact with the single battery cell increases from the center toward the outside. Air is prevented from remaining between the contact surface and the surface to be in close contact with, and heat dissipation is improved.

  In the assembled battery device of the present invention, a tab portion extending from a part (heat radiation surface) of the heat conducting member that is exposed in the cooling passage is formed, and the tab portions are arranged in the same direction. You may protrude in the inside of a cooling channel.

  In the above case, the battery cells and the heat conducting members that are alternately arranged and restrained under pressure are accommodated in the casing, and are exposed to the above heat radiating surface (inside the cooling passage so that heat can be transferred). A part of the heat conducting member) or the surface on which the tab portion protrudes comes into contact with the refrigerant in the cooling passage, and heat exchange can be performed. That is, the internal space of the tunnel-shaped cooling passage is used as a heat radiating space of the single battery cell. If the cool air of the air conditioner is circulated, the heat of each single battery cell is transferred to the heat radiating surface (the cooling passage of the heat conducting member). The heat can be evenly dissipated through the part) or the tab portion.

  Furthermore, a heat sink in which a plurality of heat radiating plates are arranged is arranged in a heat radiating space (inner space of the cooling passage), and a heat radiating surface of the heat conducting member (a part of the heat conducting member exposed inside the cooling passage) ) Is preferably brought into contact. If the cool air of the air conditioner is brought into contact with the heat sink, the heat of each single battery cell can be released more uniformly through the heat sink and the heat conducting member.

  In the case of using a heat sink, it is desirable to dispose the heat sink below the ones in which the battery cells and the heat conducting members are alternately arranged and restrained by pressure. In this way, even if dew condensation occurs in the heat sink, it is possible to prevent water droplets from coming into contact with the single battery cells, and it is possible to reliably prevent leakage.

Hereinafter, the present invention will be described specifically by way of examples.
(First embodiment)
FIG. 1 is an exploded perspective conceptual diagram of an assembled battery device according to the present embodiment. FIG. 2: shows the principal part longitudinal cross-section conceptual diagram of the assembled battery apparatus which concerns on a present Example. FIG. 3 is a conceptual diagram of a longitudinal section at the II position shown in FIG.

  As shown in the figure, an assembled battery device according to the present embodiment mainly includes an assembled battery member 101 positioned above, and a cooling passage 102 positioned below and formed in contact with a lower surface of the assembled battery member 101. With. A heat sink 4 is provided in the cooling passage 102.

(Battery material)
The assembled battery member 101 is configured as a laminated body in which a plurality of unit cells 1 each having a rectangular parallelepiped shape and a heat conductive member 2 formed in a plate shape are arranged in close contact with each other.

  As shown in FIG. 2, a pair of holding members 6 made of PP resin are attached to the end portion 130 (side surface 13) constituting the short side of the single battery cell 1.

  FIG. 4 shows an enlarged view of the holding member 6. FIG. 5 is a perspective view including a cross section of the holding member 6 in the VI-VI position shown in FIG.

  As shown in the drawing, the holding member 6 is formed in a container shape (cap shape), and includes an accommodation recess 62 for inserting and accommodating the end portion 130 of the unit cell 1 from the opening side of the cap. The housing recess 62 is formed substantially the same as the end portion 130 of the single battery cell 1. The cap-shaped holding member 6 is attached so as to cover the end portion 130 of the unit cell 1. Thereby, the unit cell 1 is sandwiched and held by the holding member 6 from both sides (side surfaces 13).

  Specifically, the holding member 6 includes a plate-like base portion 61 and an accommodation recess 62. The housing recess 62 is formed on one surface of the base 61, and constitutes a pair of first planes 611 that abut against a pair of side surfaces 10 constituting the widest surface of the unit cell 1, and a long side of the unit cell 1. A pair of second flat surfaces 612 that abut the pair of side surfaces 11 and a third flat surface 613 that faces the side surfaces 13 that form the short sides of the single battery cell 1 are provided. A pair of outer side surfaces 69 parallel to the first flat surface 611 of the housing recess 62 are provided on the outer periphery of the holding member 6. The outer side surface 69 constitutes a restricting portion of the present invention.

  By providing the holding member 6 with the outer side surface 69, the relative movement in the X direction shown in FIG. 4 of the adjacent holding member 6 (the single battery cell 1 held by the holding member 6) is restricted. Therefore, the interval between the adjacent single battery cells 1 is determined, and the amount of compression of the heat conducting member 2 is determined. That is, when the holding members 6 adjacent in the row direction are brought close to each other and the heat conducting member 2 is bent, the amount of bending can be regulated to a predetermined value.

  The holding member 6 further includes a convex first engaging portion 63 formed in the base portion 61 and a concave second engaging portion 64 that is symmetrical to the first engaging portion 63.

  The plurality of holding members 6 are juxtaposed in parallel by engaging the first engaging portions 63 with the second engaging portions 64 of the adjacent holding members 6.

  First restricting portions 65A and 65B are formed in the first engaging portion 63, and first restricting portions 65a and 65b are formed in the second engaging portion 64. As can be understood from FIG. 4, by providing the first restricting portions 65 </ b> A, 65 </ b> B, 65 a, 65 b, the holding members 6 adjacent to each other when the holding members 6 (unit cells 1 held by them) are arranged in parallel are arranged. The relative movement of the holding members adjacent to each other in the direction parallel to the first plane 611 and the third plane 613 can be restricted. That is, the relative movement in the Y direction shown in FIG. 4 is restricted and the relative position is determined between the adjacent holding members 6 (unit cells 1 held by the holding member 6).

  The first engaging portion 63 is formed with a second restricting portion 66A, and the second engaging portion 64 is formed with a second restricting portion 66a. The second restricting portions 66A and 66a constitute the restricting portion of the assembled battery device of the present invention, like the outer side surface 69. As can be understood from FIG. 4, by providing the second restricting portions 66A and 66a, when the holding members (single battery cells 1 held by them) are arranged in parallel, 66A and 66a come into contact with each other, so It is possible to regulate the interval between the holding members 6 adjacent to each other. That is, when the pressure is restrained from both ends in the arrangement direction, the second restricting portions 66A and 66a are held by the adjacent holding member 6 (in addition to the restricting action in the same direction (X direction in the drawing) by the outer side surface 69. The relative movement of the single battery cell 1) in the X direction shown in FIG. 4 is restricted, and the relative position is determined. Therefore, the interval between the adjacent single battery cells 1 is determined, and the amount of compression of the heat conducting member 2 is determined.

  The first restricting portions 65A and 65B (or the first restricting portions 65a and 65b) may be formed on at least one of the first engaging portion 63 and the second engaging portion 64. That is, in order to restrict the relative movement in the Y direction, only the first restricting portions 65A and 65B may be formed in the first engaging portion 63. For example, when only the first restricting portions 65A and 65B are formed on the first engaging portion 63, the first engaging portion 63 formed as a convex shape is inserted into the second engaging portion 64 formed as a concave shape. The first restricting portions 65A and 65B restrict the relative movement of the single battery cells 1 in the Y direction. In contrast to this, only the first restricting portions 65a and 65b may be formed in the second engaging portion 64.

  Further, the second restricting portion 66A (or the second restricting portion 66a) may be formed on at least one of the first engaging portion 63 and the second engaging portion 64. That is, in order to restrict relative movement in the X direction, only the second restricting portion 66 </ b> A may be formed in the first engaging portion 63. For example, when only the second restricting portion 66A is formed in the first engaging portion 63, the first engaging portion 63 formed as a convex shape is inserted into the second engaging portion 64 formed as a concave shape. As a result, the relative movement in the X direction between the single battery cells 1 is restricted by the second restricting portion 66A. In contrast to this, only the second restricting portion 66a may be formed in the second engaging portion 64.

  As shown in FIG. 4, the height H1 of the second restricting portion 66A of the first engaging portion 63 formed in a convex shape is the same as that of the second restricting portion 66a of the second engaging portion 64 formed in a concave shape. It is set larger than the height H2. Thereby, when pressurizing and restraining from both sides in the line-up direction, the heat conduction member 2 can be installed on the widest surface (side surface 10) of the unit cells 1 so as to be more closely attached, and heat dissipation is improved. . The thickness H3 of the side wall constituting the first flat surface 611 of the holding member 6 (that is, the thickness between the first flat surface 611 and the outer side surface 69) is 1 of the thickness H4 of the plate-like heat conducting member 2. It is set smaller than / 2. Thereby, when pressurizing and restraining from both sides in the line-up direction, the heat conducting member 2 can be installed on the widest surface (side surface 10) of the unit cells 1 so as to be further adhered, and heat dissipation is further improved. To do.

  When the height of the second restricting portion 66A is larger than the height of the second restricting portion 66a (H1> H2), the thickness H4 of the heat conducting member is H4> (2 × H3) + (H1-H2). Fulfill.

  When the height of the second restricting portion 66A is smaller than or equal to the height of the second restricting portion 66a (H1 ≦ H2), the thickness H4 of the heat conducting member satisfies H4> (2 × H3).

  Thus, the thickness H4 of the heat conducting member 2 is determined through the thickness H3 of the outer side surface 69 of the holding member 6 and the height H2 of the second restricting portion 66A, that is, the height H2 of the second restricting portion 66A. A predetermined value of the amount of deflection (compression amount) is determined.

  The first engaging portion 63 is further formed with a third restricting portion 67A, and the second engaging portion 64 is further formed with a third restricting portion 67a. As can be understood from FIG. 4, by providing the third restricting portions 67 </ b> A and 67 a, when the third flat surface 613 comes into contact with the side surface 13 constituting the short side of the single battery cell 1, The two engaging portions 64 can restrict relative movement of adjacent holding members 6 in the direction parallel to the first plane 611 and the second plane 612 when arranged in parallel. That is, the relative movement in the Z direction shown in FIG. 4 is restricted and the relative position is determined for the adjacent holding member 6 (the single battery cell 1 held by the adjacent holding member 6).

  The third restricting portion 67A (or the third restricting portion 67a) may be formed on at least one of the first engaging portion 63 and the second engaging portion 64. That is, in order to restrict relative movement in the Z direction, only the third restricting portion 67 </ b> A may be formed in the first engaging portion 63. For example, when only the third restricting portion 67A is formed in the first engaging portion 63, the first engaging portion 63 formed as a convex shape is inserted into the second engaging portion 64 formed as a concave shape. As a result, the relative movement in the Z direction between the single battery cells 1 is restricted by the second restricting portion 67A. In addition, only the third restricting portion 67a may be formed in the second engaging portion 64 symmetrically.

  Thus, when the battery cells 1 held by the holding member 6 are arranged in a row, the first engaging portion 63 of one adjacent holding member 6 is the second engaging portion of the other adjacent holding member 6. By being engaged with 64, it can be arranged in parallel. Moreover, the shift | offset | difference of the relative position of the battery cells 1 arranged by the engagement relationship of the holding members 6 can be prevented. Furthermore, by attaching the holding member 6 to the single battery cell 1, the assembled battery device can be assembled more easily and accurately. The workability of the assembled battery device is improved, and the occurrence of problems such as defective connection of electrodes due to misalignment can be reduced.

  In the assembled battery member 101, the single battery cell 1 held by the holding member 6 and the heat conducting member 2 are opposed to each other with the widest surfaces 10 of the adjacent single battery cells 1 facing each other through the heat conducting member 2. In this way, several tens of rows are alternately arranged (in FIG. 3, abbreviated to three), and the rows are formed in parallel. Depending on the thickness of the side wall of the holding member 6, a space for accommodating the heat conducting member 2 is formed between the battery cells 1 adjacent in the row direction.

  Resin constraining plates 3 are arranged at both ends of the assembled battery members 101 arranged in a row, and the unit cell 1 and the heat conducting member 2 are pressed so as to be in close contact with each other by a constraining rod (not shown). It is restrained by. In this state, the entire assembled battery member 101 is housed in a casing made of an electrically insulating resin (not shown).

  In the unit cell 1, battery elements such as an electrode plate, a separator, and an electrolytic solution are housed in an aluminum casing. A pair of positive and negative electrodes 12 protrudes from the top of the housing. The housing has six surfaces, and the widest surfaces 10 are lined up so that they face each other.

  FIG. 6 is a conceptual diagram showing a state in which the heat conducting member 2 is installed in close contact with the single battery cell 1.

  FIG. 7 is a conceptual cross-sectional view showing a state in which the heat conducting member 2 (first member 201a) is installed in close contact between the battery cells 1 at the II-II position shown in FIG. 8 shows a state where the heat conducting member 2 (second member 201b) is installed in close contact between the single battery cell 1 (battery member 101) and the heat sink 4 at the position III-III shown in FIG. A longitudinal section conceptual diagram is shown.

  As shown in FIG. 6, the heat conducting member 2 includes a mat risk base material 20 and a fiber member 21.

  Specifically, the matrix substrate 20 is made of silicone rubber having an Asker C hardness of 45 and a thermal conductivity of 5 W / m · K.

  The fiber member 21 is composed of a single fiber 21 b and is embedded in the matrix substrate 20. The single fiber 21b is formed from ultra high molecular weight polyethylene fiber ("Dyneema" manufactured by Toyobo).

  Specifically, the single fiber 21 b constituting the fiber member 21 is embedded in a substantially central portion in the thickness direction of the matrix substrate 20. The fiber member 21 is embedded in the heat conducting member 2 in an amount of 50% by volume.

  As shown in FIG. 6, the heat conductive member 2 including the fiber member 21 is provided between the unit cells 1 in the arrangement direction and between the assembled battery member 101 (unit cell 1) and the cooling passage 102. Provided. In other words, the heat conducting member 2 includes a first member 201a arranged in the horizontal direction and a plurality of second members 201b arranged in the vertical direction. The first member 201a and the second member 201b are arranged orthogonal to each other.

  In the second member 201b, the single fibers 21b are oriented in a direction substantially parallel to the widest surface (side surface 10) of the single battery cell 1 and toward the cooling passage (102).

  As for the 1st member 201a, the short fiber 21c is arrange | positioned along the thickness direction of the 1st member 201a.

  In addition, you may further mix | blend a single fiber (not shown) with the 1st member 201a. That is, the single fibers may be installed so as to be oriented substantially parallel to the side surface 11 constituting the long side of the single battery cell 1. Specifically, the monofilament is composed of a woven fabric formed by weft yarn (not shown) and warp yarn (not shown), and can be embedded in a substantially central portion of the matrix base material 20 in the thickness direction. . By providing the first member 201a with the weft and the warp, the heat can be uniformly distributed in the surface direction and can be transferred to the heat sink 4 to further improve the heat dissipation.

  As shown in FIG. 7 and FIG. 8, in addition to the fiber member 21 (single fiber 21b), the heat conductive member 2 of the assembled battery device of the present embodiment has an ultra-high height similar to that of the single fiber 21b in addition to the matrix member 20. Short fibers 21c made of molecular weight polyethylene fibers ("Dyneema" manufactured by Toyobo) are embedded and held. The short fiber 21c has its fiber length direction oriented parallel to the thickness direction of the heat conducting member 2. The short fibers 21c are contained in the heat conducting member 2 by 30 to 40% by volume.

  In order to manufacture the heat conducting member 2 (for example, the second member 201b), a composite material in which the short fibers 21c are mixed is formed. Then, when the fiber member 21 is placed in the mold and the composite material in a molten state is injected and press-molded, molding is performed while applying a magnetic field in the thickness direction of the heat conducting member 2. Thereby, the short fibers 21c can be oriented in the magnetic field direction and in the thickness direction of the heat conducting member 2.

  Further, as shown in FIG. 8, the plate-shaped second member 201 b has the widest surface constituting the close contact surface 22, and the surface perpendicular to the close contact surface 22 and including the long side of the close contact surface 22 serves as the heat dissipation surface 23. It is composed. In the second member 201 b, the single fiber 21 b is oriented toward the cooling passage 102, and the end surface is exposed to the heat dissipation surface 23.

  On the other hand, the widest surface of the first member 201 a constitutes the contact surface 22.

  As can be understood from FIG. 6, the heat radiating surface 23 of the second member 201b is in contact with one contact surface 22 of the first member 201a. The other contact surface 22 of the first member 201a is also in contact with the cooling passage 102 side. Therefore, the heat released from the widest surface 10 of the single battery cell 1 is efficiently transferred to the single fibers 21b by the short fibers 21c in the second member 201b, and the first members 201a along the orientation of the single fibers 21b. To the heat sink 4 from the contact surface 22 of the first member 201a. Then, heat is transferred to the cooling passage 102 via the heat sink 4.

  Thus, by adding the short fibers 21c to the heat conducting member 2, heat conduction in the direction orthogonal to the direction of the single fibers 21b is promoted. Due to the thermal connection between the single fiber 21b and the short fiber 21c, the heat radiation from the single battery cell 1 can be effectively and uniformly released.

  Further, when pressure restraining is performed with a restraining rod (not shown) pressed from both sides with a predetermined load, the thickness of the heat conducting member 2 is compressed by the widest side surface 10 of the pair of adjacent unit cells 1. Since the second member 201b is soft with an Asker C hardness of 45, it is easily deformed by compression, and the contact surface of the first member 201a located at the widest side surface 10 of the unit cell 1 and the bottom of the unit cell 1 The thickness is reduced while being in close contact with 22. The surplus portion of the thinned portion is absorbed by further swelling into the space above the single battery cell 1.

  Even if the single battery cell 1 is about to thermally expand, the expansion can be reliably regulated because the expansion is regulated by the heat conducting member 2 and the holding member 6. Further, the interval between the unit cells 1 is determined by the thickness of the side wall of the holding member 6, and the interval between the unit cells 1 can be made narrower than in the case where a spacer having a conventional rib is interposed. Therefore, the mounting space can be reduced.

(Cooling passage)
The cooling passage 102 is formed in a tunnel shape with a partition wall 103 made of a heat insulating wall. Openings 1022 are formed at both ends of the cooling passage 102. Cooling air (refrigerant) from the air conditioner flows through the cooling passage 102 from one opening 1022 to the other opening 1022. Thus, the cooling passage 102 is thermally protected (insulated) from the outside.

  Further, an opening 1021 is formed in the partition wall 103 on the assembled battery member 101 side, and the heat sink 4 is installed (inserted) inside the cooling passage 102 through the opening 1021.

  Further, as shown in FIG. 2, a plate-like heat conducting member 2 (first member) is formed on a side surface (bottom surface) 11 that is orthogonal to the widest surface 10 of the unit cell 1 and includes the long side of the widest surface 10. A heat sink 4 is arranged with 201a) therebetween. The side surface 11 (bottom surface) of the single battery cell 1 is in close contact with the upper surface of the first member 201 a, and the lower surface of the first member 201 a is in close contact with the surface of the heat sink 4.

  The heat sink 4 is made of metal in which a plurality of heat radiating plates are arranged, and in this embodiment, the close contact surface 22 of the first member 201 a is in close contact with the heat sink 4.

  Thus, the heat sink 4 is inserted into the cooling passage 102 thermally insulated from the outside while being in close contact with the single cell member 101, and is in contact with the refrigerant.

  Further, as shown in FIG. 1, a rib 1023 is formed at the bottom of the cooling passage 102 along a direction that protrudes from the bottom and is orthogonal to the flow direction of the refrigerant. The heat sink 4 is disposed in contact with the rib portion 1023. As a result, the heat sink 4 can be stably disposed in the cooling passage 102, and at the same time, the flow of the cooling air can be adjusted, and the heat exchange performance in the heat sink 4 is further improved.

  In this embodiment, the heat sink 4 that is in close contact with the heat conducting member 2 is used. However, instead of the heat sink 4, a part of the heat conducting member 2 is exposed to the cooling passage 102, and heat exchange (heat radiation) is directly performed by cold air. You can also

  In this embodiment, the partition wall 103 is made of a highly heat-insulating polyethylene resin, but a higher heat-insulating material such as a resin foam (polyethylene resin foam or the like) is more preferable.

  Further, in this embodiment, it is not necessary to form a space for circulating cooling air as described in Patent Document 4 between the single battery cells 1, it is not necessary to interpose a hard spacer, and heat conduction is performed. The thickness of the member 2 may be thin. Therefore, the distance between the single battery cells 1 can be reduced, and the entire space becomes compact, so that the mounting space can be reduced.

Moreover, in the assembled battery apparatus of a present Example, the position of the heat sink 4 is made into the downward direction of the single battery cell 1, as shown in a figure. For this reason, even if dew condensation occurs in the heat sink 4, it is possible to prevent water droplets from coming into contact with the single battery cell 1, and it is possible to reliably prevent leakage.
(Heat conduction member)
The fiber member 21 can be laminated in the thickness direction in the heat conductive member 2 with a single layer or multiple layers (shown in FIG. 7). Note that it is preferable to stack a plurality of layers. In this way, the total area of the end faces of the single fibers 21b exposed on the heat dissipation surface 23 can be further increased. Moreover, the distance from the contact | adherence surface 22 to the fiber member 21 becomes short. Therefore, heat dissipation is further improved.

  According to the assembled battery device of this example, the thermal conductivity of the matrix base material 20 is 5 W / m · K, the thermal conductivity in the longitudinal direction of the fibers of the fiber member 21 is 60 W / m · K, and the fibers The thermal conductivity in the short direction of the fibers of the member 21 is 3 W / m · K. Therefore, the heat of the single battery cell 1 is first transferred from the adhesion surface 22 to the matrix base material 20, and then transferred to the fiber member 21 through the inside of the matrix base material 20. And since the thermal conductivity in the longitudinal direction of the fiber is extremely high, heat is transferred from the single fiber 21b of the fiber member 21 to the heat sink 4 on the cooling passage side 102 and efficiently radiated from the heat sink 4.

  That is, according to the assembled battery device of the present embodiment, heat is radiated from the respective heat conducting members 2 under almost the same conditions. Therefore, each single battery cell 1 is cooled under almost the same conditions, and each single battery cell 1 is radiated. Can be made uniform.

Further, since there is no gap between the single battery cell 1 and the heat conducting member 2, the problem of dust accumulation in the conventional space 104 does not occur. Therefore, even after long-term use, the heat dissipation of each single battery cell 1 is almost the same, so that the cooling characteristics between the single battery cells can be made uniform, and the life is extended.
(Second embodiment)
This embodiment is basically the same as the first embodiment, and only the portion related to the holding member 6 is different from the first embodiment. Hereinafter, the holding member 6 will be described.

  FIG. 9 shows an enlarged conceptual diagram of the holding member 6 of the assembled battery device of the present embodiment.

  As shown in FIG. 9, the holding member 6 of the present embodiment includes a base 61 and a housing recess 62 that houses the end 130 of the unit cell 1, but the projection as shown in the first embodiment. The first engaging portion 63 having a shape and the second engaging portion 64 having a concave shape are not provided.

  For this reason, the thickness H4 of the heat conducting member 2 sandwiched between the single battery cells 1 is the thickness of the side wall constituting the first plane 611 of the holding member 6 (that is, the first plane 611 and the outer side surface 69). (Thickness between) H3. That is, the thickness H4 of the heat conducting member 2 is determined via the thickness H3 of the outer side surface 69 of the holding member 6, and a predetermined value of the amount of deflection (compression amount) of the heat conducting member 2 is determined. The outer side surface 69 constitutes a restricting portion of the present invention.

  The thickness H4 of the heat conducting member 2 is set to satisfy H4 ≧ (2 × H3).

1 is an exploded perspective conceptual diagram of an assembled battery device according to a first embodiment of the present invention. The principal part longitudinal cross-sectional conceptual diagram of the assembled battery apparatus which concerns on 1st Example of this invention is shown. The longitudinal cross-sectional conceptual diagram in the II position shown in FIG. 2 of the assembled battery apparatus which concerns on 1st Example of this invention is shown. The expanded conceptual diagram of the holding member for assembled battery apparatuses which concerns on 1st Example of this invention is shown. It is a perspective conceptual diagram containing the cross section in the VI-VI position shown in FIG. 2 of the holding member for assembled battery apparatuses which concerns on 1st Example of this invention. It is a conceptual diagram which shows the state by which the heat conductive member was closely_contact | adhered and installed in the single battery cell of the assembled battery apparatus which concerns on 1st Example of this invention. FIG. 3 is a schematic cross-sectional view of the assembled battery device according to the first embodiment of the present invention at the II-II position shown in FIG. 3. FIG. 3 is a conceptual diagram of a longitudinal section at the position III-III shown in FIG. 3 of the assembled battery device according to the first embodiment of the present invention. The expansion conceptual diagram of the holding member for assembled battery apparatuses which concerns on 2nd Example of this invention is shown. It is a disassembled perspective view of the conventional assembled battery apparatus.

Explanation of symbols

1: Single battery cell 2: Thermal conduction member
10, 11, 13: side surface (of single battery cell)
130: End face (of single battery cell) 6: Holding member
61: Base 62: Receiving recess 63: First convex part (convex) 64: Second engaging part (concave) 611: First plane 612: Second plane 613: Third plane

Claims (8)

A single battery cell (1) having a rectangular parallelepiped shape and a plurality of heat conduction members (2) formed in a plate shape from a soft material having thermal conductivity and electrical insulation are alternately arranged in a row. The cap-shaped holding members (6) that are respectively covered on the end portions (130) constituting the short sides of the plurality of single battery cells (1) are mounted and are restrained by pressure from both ends in the row direction. An assembled battery device comprising:
The holding member (6)
A plate-like base (61);
A pair of first planes (611) formed on one surface of the base (61) and in contact with a pair of side surfaces (10) constituting the widest surface of the unit cell (1), 1) a pair of second planes (612) in contact with the pair of side surfaces (11) constituting the long side, and a third plane facing the side surface (13) constituting the short side of the unit cell (1). (613) and an accommodation recess (62) for accommodating the end (130),
The holding member (6)
The assembled battery further comprising a restricting portion that restricts the amount of bending to a predetermined value when the holding members (6) adjacent in the row direction are brought close to each other and the heat conducting member (2) is bent. apparatus. The holding member (6)
A convex first engaging portion (63) formed on the base portion (61), and a concave second engaging portion (64) symmetrical to the first engaging portion (63),
The plurality of holding members (6) can be integrated in parallel by engaging each first engaging portion (63) with the second engaging portion (64) of the adjacent holding member (6). The assembled battery device according to claim 1.   At least one of the first engaging portion (63) and the second engaging portion (64) is configured such that the first flat surface (611) and the third third portion of the holding members (6) adjacent to each other when they are arranged in parallel. A first restricting portion (65A, 65B, 65a, 65b) that restricts relative movement in the direction parallel to the plane (613) and a second restricting portion (66A, 66a) that restricts the interval between the adjacent holding members (6). The assembled battery device according to claim 2.   4. The assembled battery device according to claim 3, wherein the restriction portion includes the second restriction portion (66 </ b> A, 66 a).   The third plane (613) contacts the side surface (13) constituting the short side of the single battery cell (1), and at least of the first engagement portion (63) and the second engagement portion (64). One is a third restricting portion (67A, 67a) that restricts relative movement of the holding members (6) adjacent to each other in parallel with the first plane (611) and the second plane (612). 5) The assembled battery device according to any one of claims 2 to 4.   The group according to claim 1, wherein the holding member (6) has a side wall constituting the first plane (611) having a thickness smaller than ½ of the thickness of the plate-like heat conducting member (2). Battery device. A single battery cell (1) having a rectangular parallelepiped shape and a plurality of heat conduction members (2) formed in a plate shape from a soft material having thermal conductivity and electrical insulation are alternately arranged in a row. And is used in an assembled battery device that is pressure-constrained from both ends in the row direction, and is a cap shape that is respectively covered on the end portions (130) constituting the short sides of the plurality of unit cells (1). Holding member for assembled battery device,
A plate-like base (61);
A pair of first planes (611) formed on one surface of the base (61) and in contact with a pair of side surfaces (10) constituting the widest surface of the unit cell (1), 1) a pair of second planes (612) in contact with the pair of side surfaces (11) constituting the long side, and a third plane facing the side surface (13) constituting the short side of the unit cell (1). (613) and an accommodating recess (62) for accommodating the end (130);
A convex first engaging portion (63) formed on the base portion (61), and a concave second engaging portion (64) symmetrical to the first engaging portion (63),
The plurality of holding members can be integrally arranged in parallel by engaging each of the first engaging portions (63) with the second engaging portion (64) of the adjacent holding member,
At least one of the first engaging portion (63) and the second engaging portion (64) is configured such that the first flat surface (611) and the third flat surface (613) of the holding members adjacent to each other when they are arranged in parallel. ) And a first restricting portion (65A, 65B, 65a, 65b) that restricts relative movement in the parallel direction, and a second restricting portion (66A, 66a) that restricts the interval between adjacent holding members. A holding member for an assembled battery device.   The third plane (613) contacts the side surface (13) constituting the short side of the single battery cell (1), and at least of the first engagement portion (63) and the second engagement portion (64). One has a third restricting portion (67A, 67a) that restricts relative movement in parallel with the first plane (611) and the second plane (612) of the holding members adjacent to each other when arranged in parallel. The holding member for an assembled battery device according to claim 7.

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