JP5510044B2 - Battery pack - Google Patents

Description

  The present invention relates to a battery pack that is an assembly of a plurality of stacked battery cells.

  In the battery pack of the first prior art, a plurality of convex portions are formed on opposing surfaces of a plurality of flat battery cells that are electrically connected in series and stacked, and the plurality of convex portions are formed of a cooling medium. It extends parallel to the flow direction to form a passage through which the cooling medium flows. In another example, a plurality of convex portions are formed at predetermined intervals on opposite surfaces of a plurality of flat battery cells.

JP 2001-283937 A

  However, in the first prior art, the plurality of protrusions formed on the opposing surfaces of the battery cells are set to dimensions that can withstand the restraining force applied to each battery cell constituting the battery pack. In terms of battery cell cooling, it cannot function sufficiently, and therefore it is necessary to flow an excessive amount of the cooling medium. There are problems such as becoming larger.

  Therefore, the present invention has been made in view of the above problems, and its purpose is to provide a battery pack capable of improving the cooling performance of the battery cell while ensuring the necessary binding strength applied to the battery cell. Is to provide.

The present invention employs the following technical means to achieve the above object. That is, the invention of claim 1 is configured by pressing and holding the plurality of stacked battery cells (2) in the stacking direction (X), and cooling fluid in a passage formed between adjacent battery cells. In the battery pack (1) for cooling each battery cell by flowing
A plate-like protrusion provided on the side surface of the battery cell perpendicular to the stacking direction (X) so as to extend in the flow direction (F) of the cooling fluid, the direction (Y) perpendicular to the flow direction (F) of the cooling fluid A plurality of plate-like protrusions (241) that are arranged to form a passage between adjacent battery cells,
A plurality of enlarged protrusions (23) provided in the middle of the plate-like protrusions extending in the cooling fluid flow direction (F) and receiving the acting force from the adjacent battery cells in contact with the adjacent battery cell side; With
The enlarged protrusion (23) is characterized in that the outer dimension in the direction (Y) in which the plurality of plate-like protrusions are arranged is formed larger than the plate thickness dimension of the plate-like protrusion.

  According to the present invention, a plurality of enlarged protrusions having a required size are dispersed and arranged in a necessary number on the side surface of the battery cell, so that the function of applying the necessary restraint to the battery cell can be stably performed. it can. In addition, the cooling performance can be enhanced because the plurality of plate-like protrusions increase the heat transfer area that performs the cooling function on the side surface of the battery cell. Since this plate-like protrusion can be made as thin as possible within the range that can sufficiently exhibit the cooling performance, the heat transfer area can be expanded without almost reducing the cooling fluid passage cross-sectional area, so that the flow rate of the cooling medium is smaller. Thus, the required cooling performance can be exhibited with the power of a smaller fluid device and with lower noise. Therefore, a battery pack that achieves both improvement of the cooling performance of the battery cell and securing of the restraining strength applied to the battery cell can be obtained.

  A second aspect is characterized in that, in the invention according to the first aspect, the enlarged protrusions and the plate-like protrusions are alternately arranged in a direction (Y) in which the plurality of plate-like protrusions are arranged. According to the present invention, the cooling fluid passage formed between the battery cells has a passage cross-sectional area that is narrower in the portion where the enlarged protrusion is formed in the flow direction of the cooling fluid than in other portions. In the flow direction, it is formed into a passage that alternately repeats a narrow portion and a wide portion of the passage cross-sectional area. Thereby, in the cooling fluid passage, a meandering flow is formed, and the boundary layer of the cooling fluid flow on the battery cell wall surface and the wall surface of the plate-like protrusion can be formed thin, and the cooling performance is improved. Can do.

  According to a third aspect of the present invention, in the invention according to the first or second aspect, the enlarged protrusion or the plate-shaped protrusion is formed on a member separate from the battery cell, and the separate member is in the stacking direction (X). It is provided in the side surface of the battery cell orthogonal to. According to this invention, the exterior case of the battery cell and the enlarged protrusion or the plate-like protrusion can be formed of different materials. For example, when the battery cell outer case and the enlarged protrusion are made of a resin material, the cooling performance of the battery cell can be improved by making the separate member forming the plate-like protrusion metal.

  According to a fourth aspect of the present invention, in the invention according to the first or second aspect, the enlarged protrusion and the plate-shaped protrusion are formed on the same member, and the same member is orthogonal to the stacking direction (X). It is provided on the side surface of the cell. According to the present invention, it is not necessary to form protrusions such as enlarged protrusions on the outer case of the battery cell. Therefore, the versatility of the battery cell outer case is improved.

  According to a fifth aspect of the present invention, in the invention according to the fourth aspect, the same member is a spacer sandwiched between adjacent battery cells. According to the present invention, by applying a restraining force to an assembly in which battery cells and spacers are alternately arranged, a battery pack that achieves both improvement in cooling performance of the battery cells and securing of restraining strength given to the battery cells is obtained. It is done.

  Claim 6 is the invention according to any one of claims 1 to 5, wherein the enlarged protrusion or the plate-like protrusion and the outer case of the battery cell are formed of a conductive material, and the enlarged protrusion Or at least one of the contact part with the adjacent battery cell side in the plate-like protrusion and the contact part with the enlarged protrusion or the plate-like protrusion on the adjacent battery cell side is covered with an insulating material. And According to this invention, since the parts which contact between adjacent battery cells come in contact via the coating | coated part of an insulating substance, the electrical insulation between battery cells is ensured. Therefore, the battery performance can be exhibited and the electrical safety can be ensured. Moreover, the situation where the conductive material corrodes due to the potential difference between the adjacent battery cells can be suppressed.

  A seventh aspect of the present invention is characterized in that, in the invention of the first or second aspect, the enlarged protrusion and the plate-like protrusion are formed integrally with the outer case of the battery cell. According to the present invention, it is possible to reduce the number of parts and the production cost.

The invention of claim 8 is configured by pressing and holding the plurality of stacked battery cells (4) in the stacking direction (X), and flowing cooling fluid through a passage formed between adjacent battery cells. In the battery pack for cooling each battery cell,
Plate-shaped protrusions (44) extending in the flow direction (F) of the cooling fluid are arranged side by side in the direction (Y) perpendicular to the flow direction (F) of the cooling fluid on the side surface of the battery cell orthogonal to the stacking direction (X). A plurality of plate-like protrusions (44) forming a passage between adjacent battery cells,
On the side surface of the battery cell orthogonal to the stacking direction (X), an enlarged protrusion (43) having a shape extending in the cooling fluid flow direction (F) is provided in the direction (Y) orthogonal to the cooling fluid flow direction (F). A plurality of enlarged protrusions (43) that are provided at intervals and that receive an acting force from the adjacent battery cell in contact with the adjacent battery cell side,
The enlarged protrusions (43) are formed so that the width dimension in the direction (Y) in which the plurality of plate-like protrusions are arranged is larger than the thickness dimension of the plate-like protrusions, and is provided at intervals. Between (43), a plurality of plate-like protrusions are arranged side by side.

  According to the present invention, since the plurality of enlarged protrusions having the necessary thickness dimensions are arranged on the side surface of the battery cell in a dispersed manner at a necessary interval, the function of applying the necessary constraint to the battery cell can be stably achieved. Can do. In addition, the cooling performance can be improved because the plurality of plate-like protrusions provided between the enlarged protrusions increase the heat transfer area that performs the cooling function on the side surface of the battery cell. Since this plate-like protrusion can be made as thin as possible within the range that can sufficiently exhibit the cooling performance, the heat transfer area can be expanded without almost reducing the cooling fluid passage cross-sectional area, so that the flow rate of the cooling medium is smaller. Thus, the required cooling performance can be exhibited with the power of a smaller fluid device and with lower noise. Therefore, a battery pack that achieves both improvement of the cooling performance of the battery cell and securing of the restraining strength applied to the battery cell can be obtained.

  According to a ninth aspect of the present invention, in the invention according to the eighth aspect, the plate-like protrusions (64A) are arranged more downstream on the side of the battery cell perpendicular to the stacking direction (X) than on the upstream side of the cooling fluid flow. It is characterized by. According to this invention, the heat transfer area on the side surface of the battery cell can be made larger on the downstream side than on the upstream side of the cooling fluid flow. Thereby, it becomes possible to promote cooling of the battery cell by the cooling fluid on the downstream side of the upstream side of the cooling fluid flow. Therefore, it is possible to make the cooling capacities on the upstream side and the downstream side of the cooling fluid flow close to each other. Accordingly, it is possible to reduce the difference in cooling capacity on the side surface of the battery cell, to suppress the temperature variation between the battery cell portions, and to appropriately exhibit the battery performance.

  A tenth aspect of the present invention is the invention according to the eighth or ninth aspect, wherein the plate-like protrusions (64A) are arranged in a direction in which a plurality of plate-like protrusions are arranged on the side surface of the battery cell orthogonal to the stacking direction (X) ( Y) is arranged more on the center side than on both sides. According to this invention, the heat transfer area on the side surface of the battery cell can be made larger on the center side than on both sides in the direction in which the plurality of plate-like protrusions are arranged. Thereby, it becomes possible to promote the cooling of the battery cell by the cooling fluid at the center side rather than the both sides with respect to the width in which the cooling fluid passages formed between the battery cells are arranged. As a result, when the heat dissipation at the central portion of the battery cell is large or the product that needs to improve the cooling performance of the central portion, the cooling efficiency in the direction in which the plurality of plate-like protrusions are arranged on the side surface of the battery cell is improved. Can be close to each other. Therefore, temperature variations between battery cell portions can be suppressed, and appropriate battery performance can be ensured.

  An eleventh aspect of the present invention is the invention according to the eighth or ninth aspect, wherein the plate-like protrusions (64) are arranged in a direction in which a plurality of plate-like protrusions are arranged on the side surface of the battery cell perpendicular to the stacking direction (X) ( Y) is arranged more on both sides than the center side. According to this invention, the heat transfer area on the side surface of the battery cell can be made larger on both sides than the center side in the direction in which the plurality of plate-like protrusions are arranged. This makes it possible to promote cooling of the battery cells by the cooling fluid on both sides of the width of the cooling fluid passages formed between the battery cells, rather than the center side. Thereby, in the case where the heat radiation at the both side portions of the battery cell is large or the product that needs to improve the cooling performance of the both side portions, the cooling ability in the direction in which the plurality of plate-like protrusions are arranged on the side surface of the battery cell is made closer to each other. be able to. Therefore, temperature variations between battery cell portions can be suppressed, and appropriate battery performance can be ensured.

  A twelfth aspect is the invention according to any one of the eighth to eleventh aspects, wherein the enlarged ridge portion or the plate-like protrusion is formed on a member separate from the battery cell, and the separate member. Is provided on the side surface of the battery cell orthogonal to the stacking direction (X). According to this invention, the exterior case of the battery cell and the enlarged protrusion or plate-like protrusion can be formed of different materials. For example, when the battery cell outer case and the enlarged protrusion are made of a resin material, the cooling performance of the battery cell can be improved if the separate member forming the plate-like protrusion is made of metal. .

  According to a thirteenth aspect of the present invention, in the invention according to any one of the eighth to eleventh aspects, the enlarged protrusion and the plate-like protrusion are formed on the same member, and the same member is arranged in the stacking direction ( It is provided on the side surface of the battery cell orthogonal to X). According to this invention, it is not necessary to form protrusions such as the enlarged protrusions on the outer case of the battery cell. Therefore, the versatility of the battery cell outer case is improved.

  A fourteenth aspect is characterized in that, in the invention according to the thirteenth aspect, the same member is a spacer sandwiched between adjacent battery cells. According to the present invention, by applying a restraining force to an assembly in which battery cells and spacers are alternately arranged, a battery pack that achieves both improvement in cooling performance of the battery cells and securing of restraining strength given to the battery cells is obtained. It is done.

  According to a fifteenth aspect of the present invention, in the invention according to any one of the eighth to fourteenth aspects, the enlarged protrusion or plate-like protrusion and the outer case of the battery cell are formed of a conductive material, and the enlarged protrusion At least one of the contact portion with the adjacent battery cell side in the strip portion or the plate-like protrusion and the contact portion with the enlarged protrusion portion or plate-like protrusion on the adjacent battery cell side is covered with an insulating material. It is characterized by that. According to this invention, since the parts which contact between adjacent battery cells come in contact via the coating | coated part of an insulating substance, the electrical insulation between battery cells is ensured. Therefore, the battery performance can be exhibited and the electrical safety can be ensured. Moreover, the situation where the conductive material corrodes due to the potential difference between the adjacent battery cells can be suppressed.

  A sixteenth aspect is characterized in that, in the invention according to the eighth or ninth aspect, the enlarged protrusion and the plate-like protrusion are formed integrally with the outer case of the battery cell. According to the present invention, it is possible to reduce the number of parts and the production cost.

  According to a seventeenth aspect of the present invention, in the invention according to any one of the first to sixteenth aspects, the plate-like protrusion has a tapered shape. According to the present invention, when the plate-like protrusion has a non-tapered shape, for example, it becomes possible to enlarge the cooling fluid passage when trying to ensure the same cooling performance as compared to the rectangular shape, The flow resistance can be reduced.

  The reference numerals in parentheses of the above means are examples that show the correspondence with the specific means described in the embodiments described later.

It is a perspective view explaining the laminated structure of the battery cell which comprises the battery pack of 1st Embodiment to which this invention is applied. It is a front view of a battery cell when the battery pack of FIG. 1 is viewed in the II direction. FIG. 3 is a partial arrow view when the battery pack of FIG. 1 is viewed in the III direction. It is a front view explaining another form about the battery cell of 1st Embodiment. It is a fragmentary top view explaining the laminated structure of the battery cell which comprises the battery pack of 2nd Embodiment to which this invention is applied. It is a front view explaining the battery cell which comprises the battery pack of 3rd Embodiment to which this invention is applied. It is a fragmentary top view explaining the laminated structure of the adjacent battery cell which comprises the battery pack of 3rd Embodiment. It is a front view explaining the battery cell which comprises the battery pack of 4th Embodiment to which this invention is applied. It is a fragmentary top view explaining the laminated structure of the adjacent battery cell which comprises the battery pack of 4th Embodiment. It is a front view explaining the battery cell which comprises the battery pack of 5th Embodiment to which this invention is applied. It is a fragmentary top view explaining the laminated structure of the adjacent battery cell which comprises the battery pack of 5th Embodiment. It is a front view explaining the battery cell which comprises the battery pack of 6th Embodiment to which this invention is applied. It is a fragmentary top view explaining the laminated structure of the adjacent battery cell which comprises the battery pack of 6th Embodiment. It is a front view explaining the battery cell which comprises the battery pack of 7th Embodiment to which this invention is applied. It is a fragmentary top view explaining the laminated structure of the adjacent battery cell which comprises the battery pack of 7th Embodiment. It is a front view explaining the battery cell which comprises the battery pack of 8th Embodiment to which this invention is applied. It is a fragmentary top view explaining the laminated structure of the adjacent battery cell which comprises the battery pack of 8th Embodiment. It is a front view explaining the battery cell which comprises the battery pack of 9th Embodiment to which this invention is applied. It is a front view explaining the battery cell which comprises the battery pack of 10th Embodiment to which this invention is applied. It is a fragmentary top view explaining the laminated structure of the adjacent battery cell which comprises the battery pack of 10th Embodiment. It is a front view explaining the battery cell which comprises the battery pack of 11th Embodiment to which this invention is applied.

  A plurality of modes for carrying out the present invention will be described below with reference to the drawings. In each embodiment, parts corresponding to the matters described in the preceding embodiment may be denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each mode, the other modes described above can be applied to the other parts of the configuration. Not only combinations of parts that clearly show that combinations are possible in each embodiment, but also combinations of the embodiments even if they are not specified, unless there is a particular problem with the combination. Is also possible.

(First embodiment)
The battery pack according to the present invention is used in, for example, a hybrid vehicle using a traveling drive source by combining an internal combustion engine and a motor driven by electric power charged in the battery, an electric vehicle using the motor as a traveling drive source, and the like. The battery constituting the battery pack is, for example, a nickel metal hydride secondary battery, a lithium ion secondary battery, or an organic radical battery, and the space between the rear seat and the trunk room under the seat of the automobile in a state of being housed in the housing, It is placed in the space between the driver seat and the passenger seat.

  1st Embodiment which is one Embodiment of this invention is described using FIGS. 1-4. FIG. 1 is a perspective view illustrating a stacked structure of battery cells 2 constituting the battery pack 1 of the first embodiment. FIG. 2 is a front view of the battery cell when the battery pack of FIG. 1 is viewed in the II direction. FIG. 3 is a partial arrow view when the battery pack 1 of FIG. 1 is viewed in the III direction. FIG. 4 is a front view illustrating a battery cell 2 </ b> A that is another embodiment of the battery cell 2. In each figure, a direction in which a plurality of battery cells 2 are stacked and arranged is defined as a stacking direction X, a direction in which each rectangular parallelepiped battery cell 2 extends in a horizontal direction is defined as a cooling fluid flow direction F, and the stacking direction X and the cooling fluid A direction perpendicular to both the flow directions F is defined as a direction Y in which a plurality of plate-like protrusions are arranged (hereinafter also simply referred to as a Y direction).

  A battery pack 1 that is an assembly of a plurality of battery cells 2 indicated by a two-dot chain line in FIG. 1 is controlled by electronic components (not shown) used for charging and discharging of the plurality of battery cells 2 or temperature control. Each battery cell 2 is cooled by receiving air blown by a blower member (not shown). The battery pack 1 is formed by stacking a plurality of battery cells 2 electrically connected in series so that their side surfaces are opposed to each other and integrating them, and is housed in a housing (not shown). Yes. The electronic components are a relay, a motor that drives a blower member, an electronic component that controls an inverter, and various electronic control devices.

  The housing is a rectangular parallelepiped case configured to be removable at least one surface for maintenance, and is formed of a resin or a steel plate. The casing is provided with an attachment portion for fixing the casing to the vehicle side by bolting or the like, and an equipment storage box (not shown).

  The device box includes a battery monitoring unit (not shown) to which detection results from various sensors that monitor the battery state (for example, voltage, temperature, etc.) are input, and a relay configured to be communicable with the battery monitoring unit. A control device that controls the driving of the motor of the blower member and a wire harness that connects each device are housed. The battery monitoring unit is a battery ECU (battery electronic control unit) that monitors the state of each battery cell 2, and is connected to the battery pack 1 by a number of wires.

  As shown in FIG. 1, the battery pack 1 is formed by pressing side surfaces 2 a and 2 b (side surfaces parallel to the directions Y and F) of the battery cells orthogonal to the stacking direction X by a restraining device (not shown). This is a battery cell assembly in which a plurality of stacked rectangular battery cells 2 are integrally held. The plurality of battery cells 2 constituting the battery pack 1 are connected to both ends of the battery pack 1 by connecting restraint plates (not shown) installed at both ends in the stacking direction X of the battery pack 1 with rods (not shown). It is restrained by receiving a compressive force due to an external force directed inward from the part. For example, the plurality of battery cells 2 are integrally fixed by receiving compression force by four rod-shaped rods. The rod is formed of a material having excellent strength such as a metal or a hard resin so that the plurality of stacked battery cells 2 can be pressed and integrated with a stable force.

  Next, each battery cell 2 constituting the battery pack 1 will be described. Each battery cell 2 is a flat rectangular parallelepiped whose outer peripheral surface is covered with an exterior case. In each battery cell 2, two terminal portions including a positive electrode terminal 21 and a negative electrode terminal 22 are arranged apart from each other in the Y direction, and the terminal portions are exposed so as to protrude in the flow direction F of the cooling fluid from the outer case. ing.

  Thus, all the battery cells 2 arranged in the entire housing start from the negative electrode terminal 22 in the battery cell 2 located on the one end side in the stacking direction X of the battery pack 1, and the terminal portion of each battery cell 2. Each bus bar (not shown) that connects between the battery packs 1 energizes to the positive electrode terminal 21 of the battery cell 2 located on the other end side in the stacking direction X of the battery pack 1 while reciprocating in the battery pack 1 in the Y direction. Possible to be connected in series. In this manner, the battery cells 2 adjacent in the stacking direction X are electrically connected. In other words, all the battery cells 2 constituting the battery pack 1 are connected to the battery cell 2 located at the other end portion in the stacking direction X from the terminal portion of the battery cell 2 located at the one end portion in the stacking direction X. Electrical connection is made in series via the bus bar so that the current flows in a zigzag or meandering manner until reaching the terminal portion.

  On the side surfaces 2a and 2b of the battery cell orthogonal to the stacking direction X, a plurality of plate-like protrusions 241 extending in the cooling fluid flow direction F are provided. The plurality of plate-like protrusions 241 are arranged at a predetermined interval in a direction Y orthogonal to the flow direction F of the cooling fluid. The plurality of plate-like protrusions 241 form a plurality of passages through which the cooling fluid flows between adjacent battery cells 2.

  Further, on the side surfaces 2a and 2b of the battery cell, a plurality of enlarged protrusions 23 are provided in the middle of a plate-like protrusion 241 extending in the flow direction F of the cooling fluid. The expansion protrusion 23 is disposed so as to come into contact with and abut on the adjacent battery cell 2 side when a restraining force in the stacking direction X is applied by the restraining device, and receives the acting force from the adjacent battery cell 2. . The enlarged protrusion 23 is formed such that the outer dimension in the direction Y in which the plurality of plate-like protrusions are arranged is larger than the plate thickness dimension of the plate-like protrusion 241. In the present embodiment, the enlarged protrusion 23 forms a so-called cylindrical boss, but is not limited to such a shape.

  As shown in FIGS. 1 and 2, a plurality (two or three in the figure) of the enlarged protrusions 23 are provided in the middle of one plate-like protrusion 241 at a predetermined interval. That is, the enlarged protrusions 23 are provided on both sides of one enlarged protrusion 23 in the cooling fluid flow direction F. Since the enlarged protrusions 23 are arranged in a staggered manner on the side surfaces 2a and 2b of the battery cells orthogonal to the stacking direction X, there is a plate-like protrusion 241 next to the enlarged protrusions 23 in the Y direction. Yes. With such a configuration, the enlarged protrusions 23 and the plate-like protrusions 241 are alternately arranged in the direction Y in which the plurality of plate-like protrusions are arranged.

  The enlarged protrusions 23 and the plate-like protrusions 241 are formed so that the protruding height in the stacking direction X is the same or the enlarged protrusions 23 are slightly higher. As a result, as shown in FIG. 3, when the restraining force in the stacking direction X is applied to each battery cell 2 by the restraining device, at least the enlarged protrusions 23 in the adjacent battery cells 2 are in contact with each other and act. It is like that. At this time, the plate-like protrusions 241 in the adjacent battery cells 2 may be in contact with each other or may be separated from each other.

  As described above, in the battery cell 2, the plurality of enlarged protrusions 23 have a function of exerting a restraining strength that can withstand the restraining force acting on each battery cell, and the plurality of plate-like protrusions 241 are used as a cooling fluid. It is a part which expands the heat transfer area of the battery cell 2 by contacting, and functions as a heat transfer path for releasing the heat of the battery cell 2 to the cooling fluid.

  In the present embodiment, the enlarged protrusion 23 is a protrusion formed on the outer case of the battery cell 2, and the plate-like protrusion 241 is formed on a separate plate member 24 that is a separate component from the battery cell 2. Yes. The metal plate member 24 is formed with a plurality of plate-like protrusions 241 and holes through which the enlarged protrusions 23 pass by press working or the like. That is, the plate member 24 is a metal finned plate having a hole through which all the plurality of enlarged protrusions 23 can be inserted.

  The separate plate member 24 is provided on the side surfaces 2a and 2b of the battery cell orthogonal to the stacking direction X, for example, by integral molding. The exterior case in which the enlarged protrusions 23 are integrally formed is formed of, for example, any resin having insulation properties, such as polypropylene, polyethylene, polystyrene, vinyl chloride, fluorine resin, PBT, polyamide, polyamideimide (PAI resin), It can be formed of a resin such as ABS resin (acrylonitrile, butadiene, styrene copolymer synthetic resin), polyacetal, polycarbonate, polybutylene terephthalate, polyethylene terephthalate, polyphenylene sulfide, phenol, epoxy, acrylic.

  By employing such a separate plate member 24, the outer case of the battery cell 2 and the enlarged protrusion 23 or the plate-like protrusion 241 can be formed of different materials. For example, if the separate member that forms the plate-like protrusion is made of a material having excellent thermal conductivity, the cooling performance of the battery cell can be improved.

  In another embodiment, the plate-like protrusion 241 may be a fin formed on the outer case of the battery cell 2, and the enlarged protrusion 23 may be formed on a plate member separate from the battery cell 2.

  In another embodiment, as shown in FIG. 4, for example, both the enlarged protrusion 23 and the plate-like protrusion 241 may be formed in the same member 24A. According to this configuration, it is not necessary to form protrusions such as the enlarged protrusions 23 on the outer case of the battery cell 2A. Therefore, the versatility of the outer case of the battery cell 2A is improved.

  Further, the same member may be a plate member separate from the battery cell 2. In this case, the same member on which both the enlarged protrusion 23 and the plate-like protrusion 241 are formed can be provided on the side surface of the battery cell orthogonal to the stacking direction X by integral molding such as insert molding.

  As shown in FIG. 4, the same member may be a spacer 24 </ b> A sandwiched between adjacent battery cells 2. According to this configuration, by applying a restraining force to the assembly in which the battery cells 2 and the spacers are alternately arranged, it is possible to improve both the cooling performance of the battery cells 2 and ensure the restraining strength applied to the battery cells 2. .

  Further, the enlarged protrusion 23 and the plate-like protrusion may be formed integrally with the outer case of the battery cell 2. According to this, it is possible to reduce the number of parts and the production cost.

  Furthermore, when the exterior case of the battery cell 2 and the enlarged protrusion 23 or the plate-like protrusion 241 are formed of a conductive material, the adjacent battery cell side of the enlarged protrusion 23 or the plate-like protrusion 241 It is preferable that at least one of the contact portion and the contact portion with the enlarged protrusion 23 or the plate-like protrusion 241 on the adjacent battery cell side is covered with an insulating material. The coating of the insulating material at the part can be formed by vapor deposition, coating, integral molding, or the like. According to such a structure, since the parts which contact between adjacent battery cells come in contact through the coating | coated part of an insulating substance, the electrical insulation between battery cells is ensured and battery performance is exhibited. In addition, electrical safety can be ensured. Moreover, the situation where the conductive material portion corrodes due to the potential difference between the adjacent battery cells 2 can be suppressed.

  The effect which the battery pack 1 of this embodiment brings is described. The battery pack 1 is a plate-like protrusion provided on the side surface of the battery cell 2 orthogonal to the stacking direction X so as to extend in the cooling fluid flow direction F, and is orthogonal to the cooling fluid flow direction F. A plurality of plate-like protrusions 241 that are provided so as to be lined up in the direction Y to form a passage between adjacent battery cells 2 and a plurality of plate-like protrusions 241 that extend in the flow direction F of the cooling fluid are provided in the middle. And a plurality of enlarged protrusions 23 that contact the adjacent battery cell 2 side and receive the acting force from the adjacent battery cell 2. Each of the enlarged protrusions 23 is formed such that the outer dimension in the direction Y in which the plurality of plate-like protrusions are arranged is larger than the plate thickness dimension of the plate-like protrusion 241.

  According to this configuration, the plate-shaped protrusions that extend in the cooling fluid flow direction F and are aligned in the direction Y orthogonal to the cooling fluid flow direction F have a large heat transfer area that performs the cooling function on the side surface of the battery cell 2. Therefore, the cooling performance can be improved. Since this plate-like protrusion 241 is made as thin as possible within a range in which the cooling performance can be sufficiently exhibited, the heat transfer area can be expanded without almost reducing the cooling fluid passage cross-sectional area. The required cooling performance can be achieved with a medium flow rate, with less fluid equipment power and with lower noise.

  Furthermore, a plurality of enlarged protrusions 23 that contact the adjacent battery cell 2 side and receive the acting force from the adjacent battery cell 2 are provided in the middle of the plate-like protrusion 241 that extends in the flow direction of the cooling fluid. The restraining force received by the side surface of the battery cell 2 can be dispersed without being excessively biased. As a result, it is possible to reduce the concentration of the binding force at a specific location, so that the binding strength of each battery cell 2 can be ensured.

  Further, the enlarged protrusion 23 is formed such that the outer dimension in the direction Y in which the plurality of plate-like protrusions are arranged is larger than the plate thickness dimension of the plate-like protrusion 241, thereby reducing the outer dimension of the enlarged protrusion 23. By increasing the size so as to ensure the necessary restraint strength, it is possible to improve the restraint strength and provide a battery pack that is less susceptible to vibration and the like. Therefore, it is possible to achieve both improvement of the cooling performance of the battery cell 2 and securing of the constraint strength given to the battery cell 2.

  Further, since the plate-like protrusion 241 can function as a fin member for heat dissipation, the cross-sectional area of the cooling fluid passage is almost reduced by reducing the plate thickness as much as possible within a range where the cooling performance can be sufficiently exhibited. Therefore, the heat radiation amount from the plate-like protrusion 241 is increased, and the heat radiation performance can be improved.

  The enlarged protrusion 23 provided in the middle of the extending direction of the plate-like protrusion 241 is formed such that the outer dimension in the direction Y in which the plurality of plate-like protrusions are arranged is larger than the plate thickness of the plate-like protrusion 241. Therefore, the cooling fluid passage formed between the battery cells 2 has a passage cross-sectional area at a portion where the enlarged protrusion 23 and the plate-like protrusion 241 face each other as compared with a portion where the two plate-like protrusions 241 face each other. Becomes narrower. As a result, the fluid flowing through the cooling fluid passage flows toward the plate-like protrusion 241 at a portion where the enlarged protrusion 23 and the plate-like protrusion 241 face each other, so that a meandering flow is easily formed. Since the boundary layer of the heat transfer surface of the cooling fluid flow can be formed thin by forming such a flow, the heat transfer performance can be improved and the cooling performance can be improved.

  In addition, the enlarged protrusions 23 and the plate-like protrusions 241 are alternately arranged in the direction Y in which the plurality of plate-like protrusions are arranged, so that the cooling fluid passage formed between the battery cells 2 has a flow of cooling fluid. In the part where the enlarged protrusion 23 is formed in the direction F, the passage cross-sectional area becomes narrower than in other parts. Therefore, the cooling fluid passage is formed in a passage that alternately repeats a narrow portion and a wide portion of the passage cross-sectional area in the flow direction F of the cooling fluid. As a result, the fluid flowing through the cooling fluid passage is bent toward the plate-like protrusion 241 facing the portion where the enlarged protrusion 23 is present, and then returns to the original position. The flow turns to 241 side. For this reason, since the boundary layer of the heat transfer surface of the cooling fluid flow can be formed thin by forming a meandering flow, the heat transfer performance can be improved and the cooling performance can be improved.

(Second Embodiment)
In 2nd Embodiment, the battery pack using the battery cell 3 which is another form with respect to 1st Embodiment is demonstrated with reference to FIG. FIG. 5 is a partial plan view for explaining the laminated structure of the battery cells 3 constituting the battery pack of the second embodiment.

  As shown in FIG. 5, the stacked structure of the battery cells 3 is such that when the restraining force in the stacking direction X is applied to the stacked structure of the battery cells 2 shown in FIG. The expansion protrusions 33 and the expansion protrusions 35 are not in direct contact with each other, but the expansion protrusions 33 and the expansion protrusions 35 come into contact with the side surfaces 3b and 3a of the battery cells, respectively, and can restrain the restraining force. It is different in that it demonstrates. Other structures are the same and have the same effects.

(Third embodiment)
3rd Embodiment demonstrates the laminated structure of the battery cell which is another form with respect to 1st Embodiment with reference to FIG.6 and FIG.7. FIG. 6 is a front view for explaining the battery cell 4 constituting the battery pack of the third embodiment. FIG. 7 is a partial plan view illustrating a stacked structure of adjacent battery cells 4 according to the third embodiment.

  The stacked structure of the adjacent battery cells 4 in the third embodiment is different from the first embodiment in the shape of the enlarged protrusion 43 and the positional relationship between the enlarged protrusion 43 and the plate-like protrusion 44. However, other configurations are the same, and the same effects are obtained. Only differences from the first embodiment will be described below.

  The enlarged protrusion 43 has a rail shape extending in the flow direction F of the cooling fluid on the side surface 4a of the battery cell orthogonal to the stacking direction X, and extends over the entire side surface 4a of the battery cell in the same direction. The plurality of enlarged protrusions 43 are provided at intervals in a direction Y orthogonal to the flow direction F of the cooling fluid. When a restraining force in the stacking direction X is applied to each battery cell 4 by the restraining device, the plurality of enlarged protrusions 43 are in contact with the adjacent battery cell side and act from the adjacent battery cell 4. Receive. Furthermore, each enlarged protrusion 43 has a width dimension in the direction Y in which the plurality of plate-like protrusions are arranged larger than the thickness dimension of the plate-like protrusion 44. That is, since the enlarged protrusion 43 has a plate thickness larger than that of the thin plate-like protrusion 44, the enlarged protrusion 43 has a large strength and has a strength that is difficult to be deformed with respect to a force acting in the stacking direction X.

  In this embodiment, as shown in FIGS. 6 and 7, the enlarged protrusions 43 are arranged in a plurality (six in this embodiment) in a line with a predetermined interval in the direction Y in which the plurality of plate-like protrusions are arranged. Has been. A plurality of plate-like protrusions 44 (four in this embodiment) are arranged side by side between the enlarged protrusions 43 provided at intervals in this way. That is, the number of the enlarged protrusions 43 is smaller than the number of the plate-like protrusions 44. Therefore, the number of the enlarged protrusions 43 per unit area on the side surface 4a of the battery cell is the plate-like protrusion per unit area. Less than the number of parts 44.

  Therefore, since the plurality of enlarged ridge portions 43 are formed to have a large thickness in the Y direction, when the plurality of enlarged ridge portions 43 come into contact with the plurality of enlarged ridge portions 43 provided in the adjacent battery cells 4, Demonstrate the function of receiving strength. Further, the plurality of plate-like protrusions 44 disposed between the enlarged protrusions 43 have a function of expanding the heat transfer area in the passage of the cooling fluid between the adjacent battery cells 4 and have a heat dissipation performance. Demonstrate improved functionality.

  Further, the enlarged protrusions 43 and the plate-like protrusions 44 are uniformly arranged over the entire side surface 4a of the battery cell in the direction Y perpendicular to the cooling fluid flow direction F. The plate-like protrusions 44 between the adjacent battery cells 4 are in a positional relationship in which the top surfaces of each other face each other. It should be noted that the plate-like protrusions 44 between adjacent battery cells 4 may be in a positional relationship where they contact each other or may be in a positional relationship where they are separated from each other.

  In the third embodiment, the enlarged protrusion 43 is a protrusion formed on the outer case of the battery cell 4, and the plate-like protrusion 44 is formed on a separate plate member that is a separate component from the battery cell 4. ing. The metal plate member is formed with a plurality of plate-like protrusions 44 and elongated rectangular holes through which the enlarged protrusions 43 pass by pressing or the like. That is, the plate member is a metal finned plate having a hole through which all of the plurality of enlarged protrusions 43 can be inserted.

  The separate plate member is provided on the side surface 4a of the battery cell orthogonal to the stacking direction X, for example, by integral molding. The exterior case in which the enlarged protrusions 43 are integrally formed is formed of, for example, any resin having insulating properties, such as polypropylene, polyethylene, polystyrene, vinyl chloride, fluorine resin, PBT, polyamide, polyamideimide (PAI resin). , ABS resin (acrylonitrile, butadiene, styrene copolymer synthetic resin), polyacetal, polycarbonate, polybutylene terephthalate, polyethylene terephthalate, polyphenylene sulfide, phenol, epoxy, acrylic resin and the like.

  In another embodiment, the plate-like protrusion 44 may be a fin formed on the outer case of the battery cell 4, and the enlarged protrusion 43 may be formed on a plate member separate from the battery cell 4. .

  In another form, both the enlarged protrusion 43 and the plate-like protrusion 44 may be formed in the same member. Further, the same member may be a plate member separate from the battery cell 4. In this case, the same member in which both the enlarged protrusion 43 and the plate-like protrusion 44 are formed can be provided on the side surface of the battery cell orthogonal to the stacking direction X by integral molding such as insert molding.

  The same member may be a spacer sandwiched between adjacent battery cells 4. According to this configuration, both the improvement of the cooling performance of the battery cell 4 and the securing of the restraint strength applied to the battery cell 4 can be achieved by applying a restraining force to the assembly in which the battery cell 4 and the spacer are alternately arranged. .

  Further, the enlarged projecting portion 43 and the plate-like projecting portion 44 may be formed integrally with the outer case of the battery cell 4. According to this, it is possible to reduce the number of parts and the production cost.

  Further, when the enlarged protrusion 43 or the plate-like protrusion 44 and the outer case of the battery cell 4 are formed of a conductive material, the adjacent battery cell side in the enlarged protrusion 43 or the plate-like protrusion 44. It is preferable that at least one of the contact part with the enlarged ridge 43 or the plate-like protrusion 44 on the adjacent battery cell side is covered with an insulating substance. The coating of the insulating material at the part can be formed by vapor deposition, coating, integral molding, or the like. According to such a structure, since the parts which contact between adjacent battery cells come in contact through the coating | coated part of an insulating substance, the electrical insulation between battery cells is ensured and battery performance is exhibited. In addition, electrical safety can be ensured. Moreover, the situation where the conductive material portion corrodes due to the potential difference between the adjacent battery cells 4 can be suppressed.

  The effect which the battery pack of this embodiment brings is described. The battery pack is configured by arranging plate-like protrusions 44 extending in the flow direction F of the cooling fluid on the side surface 4a of the battery cell perpendicular to the stacking direction X in the direction Y perpendicular to the flow direction F of the cooling fluid. A plurality of plate-like protrusions 44 that form a passage with the cell 4 and an enlarged protrusion 43 having a shape extending in the flow direction F of the cooling fluid are formed on the side surface 4a of the battery cell orthogonal to the stacking direction X. A plurality of enlarged protrusions 43 that are provided at intervals in a direction Y orthogonal to the flow direction F of the battery and receive the acting force from the adjacent battery cell 4 in contact with the adjacent battery cell 4 side. . The enlarged protrusions 43 are formed such that the width dimension in the direction Y in which the plurality of plate-like protrusions are arranged is larger than the thickness dimension of the plate-like protrusions 44, and between the enlarged protrusions 43 provided at intervals. A plurality of plate-like protrusions 44 are arranged side by side.

  According to this configuration, since the plurality of enlarged protrusions 43 having a required thickness are arranged at the necessary intervals on the side surface 4a of the battery cell, the function of applying the necessary restraint to the battery cell 4 is stable. Can be fulfilled. In addition, the cooling performance can be improved because the plurality of plate-like protrusions 44 provided between the enlarged protrusions 43 increase the heat transfer area for performing the cooling function on the side surface 4a of the battery cell. Since this plate-like protrusion 44 can be made as thin as possible within a range where the cooling performance can be sufficiently exerted, the heat transfer area can be expanded without almost reducing the cooling fluid passage cross-sectional area, so that a smaller amount of cooling medium can be obtained. The required cooling performance can be achieved at a flow rate, with less fluid power and with lower noise. Therefore, it is possible to improve both the cooling performance between the battery cells 4 and secure the restraint strength given to the battery cells 4.

  Further, since the plate-like projection 44 can function as a fin member for heat dissipation, by reducing the plate thickness as much as possible, the cross-sectional area of the cooling fluid passage can be increased, The amount of heat released from the protrusion 44 is increased, and the cooling performance can be improved.

(Fourth embodiment)
4th Embodiment demonstrates the laminated structure of the battery cell 4A which is another form with respect to 3rd Embodiment with reference to FIG.8 and FIG.9. FIG. 8 is a front view for explaining a battery cell 4A constituting the battery pack of the fourth embodiment. FIG. 9 is a partial plan view illustrating a stacked structure of adjacent battery cells 4A.

  As shown in FIGS. 8 and 9, the stacked structure of the battery cell 4A is adjacent to the stacked structure of the battery cell 4 shown in the third embodiment when a restraining force in the stacking direction X is applied by the restraining device. The plate-like protrusions 44A and the plate-like protrusions 46A between the matching battery cells 4A are not in a positional relationship in which the top surfaces of the battery cells 4A face each other, but the plate-like protrusions 44A, 46A of one adjacent battery cell 4A. Is different from the plate-like protrusions 44A and 46A of the other battery cell 4A in that it is displaced in the Y direction. For this reason, even if the height of the plate-like protrusions 44A and 46A is higher than that of the enlarged protrusions 43A and 45A, the adjacent plate-like protrusions 44A or 46A can be prevented from interfering and deforming. Other configurations including the enlarged ridge portions 43A and 45A are the same and have the same effects.

(Fifth embodiment)
5th Embodiment demonstrates the laminated structure of the battery cell 5 which is another form with respect to 4th Embodiment with reference to FIG.10 and FIG.11. FIG. 10 is a front view for explaining the battery cell 5 constituting the battery pack of the fifth embodiment. FIG. 11 is a partial plan view for explaining a laminated structure of adjacent battery cells 5.

  As shown in FIGS. 10 and 11, the stacked structure of the battery cells 5 is an enlargement provided on the side surfaces 5a and 5b of the battery cells with an interval from the stacked structure of the battery cells 4A shown in the fourth embodiment. The number of the plate-like protrusions 54 and 56 arranged between the protrusions 53 and the enlarged protrusions 55 is different.

  In the present embodiment, as shown in FIGS. 10 and 11, six enlarged ridges 53 and 55 are arranged side by side at a predetermined interval in the direction Y in which the plurality of plate-like protrusions are arranged. A plurality of plate-like protrusions 54 and 56 (two in this embodiment) are arranged side by side between the enlarged ridges 53 and the enlarged ridges 55 provided at intervals in this manner. Has been. That is, the number of the enlarged protrusions 53 and 55 is smaller than the number of the plate-like protrusions 54 and 56. Therefore, the number of the enlarged protrusions 53 and 55 per unit area on the side surfaces 5a and 5b of the battery cell is The number is less than the number of plate-like protrusions 54 and 56 per unit area.

  Further, when a restraining force in the stacking direction X is applied by the restraining device, the enlarged ridges 53 and the enlarged ridges 55 are in contact with each other between the adjacent battery cells 5. On the other hand, the plate-like protrusions 54 and the plate-like protrusions 56 between the adjacent battery cells 5 are not in a positional relationship in which the top surfaces face each other, but the plate-like protrusions of one adjacent battery cell 5. The portions 54 and 56 are in a positional relationship that shifts in the Y direction with respect to the plate-like protrusions 54 and 56 of the other battery cell 5. Further, the height of the plate-like protrusions 54 and 56 is higher than the height of the enlarged protrusions 53 and 55. Moreover, this embodiment has the same effect as the fourth embodiment.

(Sixth embodiment)
In the sixth embodiment, a stacked structure of battery cells 5A, which is another form of the fifth embodiment, will be described with reference to FIGS. FIG. 12 is a front view for explaining a battery cell 5A constituting the battery pack of the sixth embodiment. FIG. 13 is a partial plan view for explaining a laminated structure of adjacent battery cells 5A.

  As shown in FIGS. 12 and 13, the stacked structure of the battery cells 5A is different from the stacked structure of the battery cells 5 shown in the fifth embodiment in that the tips of the plate-like protrusions 54A and the plate-like protrusions 56A are rooted. It differs in that it is thin and tapered with respect to the part. According to the shape of the plate-like protrusions 54A and the plate-like protrusions 56A, for example, even if the plate-like protrusions 54 and the plate-like protrusions 56 have the same heat dissipation performance, Since the cross-sectional area can be reduced, the flow resistance can be reduced, the power of the fluid transportation device such as a blower can be reduced, and the noise can be reduced. Moreover, the other structure including the expansion protrusions 53 and 55 is the same, and there exists the same effect.

(Seventh embodiment)
7th Embodiment demonstrates the battery pack using the battery cell 6 which is another form with respect to 5th Embodiment with reference to FIG.14 and FIG.15. FIG. 14 is a front view for explaining a battery cell 6 constituting the battery pack of the seventh embodiment. FIG. 15 is a partial plan view for explaining the laminated structure of adjacent battery cells 6.

  As shown in FIGS. 14 and 15, the stacked structure of the battery cells 6 is adjacent to the stacked structure of the battery cells 5 shown in the fifth embodiment when a restraining force in the stacking direction X is applied by the restraining device. The enlarged ridges 63 and the enlarged ridges 65 do not directly contact each other between the matching battery cells 6, but the enlarged ridges 63 and the enlarged ridges 65 contact the side surfaces 6 a and 6 b of the battery cells, respectively. It is different in that the restraint strength that can withstand the restraining force is exhibited. Other structures are the same and have the same effects. According to such a configuration, when the battery cells 6 are arranged in a stacked manner, even if a positional deviation in the Y direction occurs compared to the fifth embodiment, the influence can be reduced, and the restraint strength can be surely exhibited. .

  Further, in this embodiment, as shown in FIGS. 14 and 15, the three enlarged protrusions 63 and 65 are arranged in a line at a predetermined interval in the direction Y in which a plurality of plate-like protrusions are arranged. It is arranged to be biased to the side. A plurality of plate-like projections 64 and 66 (four in this embodiment) are arranged side by side between the enlarged ridges 63 and the enlarged ridges 65 provided at intervals in this way. Has been. That is, the number of the enlarged protrusions 63 and 65 is smaller than the number of the plate-like protrusions 64 and 66. Therefore, the number of the enlarged protrusions 63 and 65 per unit area on the side surfaces 6a and 6b of the battery cell is The number is less than the number of plate-like protrusions 64 and 66 per unit area.

(Eighth embodiment)
In the eighth embodiment, a battery pack using a battery cell 6A which is another form with respect to the seventh embodiment will be described with reference to FIGS. 16 and 17. FIG. 16 is a front view for explaining a battery cell 6A constituting the battery pack of the eighth embodiment. FIG. 17 is a partial plan view illustrating a stacked structure of adjacent battery cells 6A.

  As shown in FIGS. 16 and 17, the laminated structure of the battery cells 6A is different from the laminated structure of the battery cells 6 shown in the seventh embodiment in that the plate-like protrusions 64A and the plate-like protrusions 66A are arranged in the stacking direction X. Is different in that the side surfaces 6a and 6b of the battery cell orthogonal to the side are arranged in the downstream portion 6a2 more than the upstream portion 6a1 of the cooling fluid flow. Other structures are the same and have the same effects.

  The plate-like protrusions 64A and 66A on the side surfaces 6a and 6b of the battery cell are provided over the entire width in the direction Y in which the plurality of plate-like protrusions are arranged, as shown in FIGS. It is shorter in the flow direction F of the cooling fluid than the plate-like protrusion 64 of the embodiment, and is not disposed in the upstream portion 6a1 of the cooling fluid flow, but is disposed only in the downstream portion 6a2.

  According to such a configuration, the heat transfer area on the side surfaces 6a and 6b of the battery cell can be made larger in the downstream portion 6a2 than in the upstream portion 6a1 of the cooling fluid flow. Thereby, it becomes possible to promote the cooling of the battery cell 6A by the cooling fluid on the downstream side of the upstream side of the cooling fluid flow, and the cooling capacity on the upstream side and the downstream side of the cooling fluid flow can be made closer to each other. Therefore, the difference in the cooling capacity between the side surfaces 6a and 6b of the battery cell can be reduced, the temperature variation between the portions of the battery cell 6A can be suppressed, and the battery performance can be appropriately exhibited.

(Ninth embodiment)
In the ninth embodiment, a battery pack that uses battery cells 6B according to another embodiment of the seventh embodiment will be described with reference to FIG. FIG. 18 is a front view for explaining a battery cell 6B constituting the battery pack of the ninth embodiment.

  As shown in FIG. 18, the stacked structure of the battery cell 6B is transmitted in a direction Y perpendicular to the flow direction F of the cooling fluid on the side surface 6a of the battery cell with respect to the stacked structure of the battery cell 6 shown in the seventh embodiment. It differs in that it has a configuration that changes the thermal area. As an example of such a configuration, in the ninth embodiment, the plate-like protrusions on both side portions 6a4 of the side surface 6a of the battery cell orthogonal to the stacking direction X are located on both side portions 6a4 rather than the central side portion 6a3 in the direction Y in which the plurality of plate-like protrusions are arranged. Many 64 are arranged. Other configurations are the same as those of the seventh embodiment, and the same operational effects are achieved.

  According to the configuration relating to the arrangement of the plate-like protrusions 64 of the ninth embodiment, the heat transfer areas on the side surfaces 6a and 6b of the battery cells are set to both side portions than the center side portion 6a3 in the direction Y in which the plurality of plate-like protrusions are arranged. 6a4 can be enlarged. That is, on the side surface 6a of the battery cell, as shown in FIG. 18, the plate-like protrusions 64 are not arranged at the center portion of the Y direction width, but are arranged at portions other than the center portion of the Y direction width. Therefore, the number of the plate-like protrusions 64 per unit area on the side surface 6a of the battery cell is larger in the other parts (particularly both side parts 6a4) than in the center part in the width in the Y direction, so that the heat transfer area per unit area is also large. It is larger on both sides than the center side of the cooling fluid flow.

  Thereby, in the width in which the cooling fluid passages formed between the battery cells 6B are arranged, it becomes possible to promote the cooling of the battery cells 6B by the cooling fluid on both sides of the center side, and in the both side portions of the battery cells 6B. When the heat radiation is large or when it is necessary to improve the cooling performance of the both side portions, the cooling capacity in the direction Y in which the plurality of plate-like protrusions are arranged on the side surfaces 6a and 6b of the battery cell can be changed. You can also get closer. Thus, if the cooling capacity on the side surface 6a of the battery cell can be changed according to the difference in the partial heat generation density of the battery cell 6B, the temperature variation between the parts of the battery cell 6B can be suppressed, and the battery performance can be reduced. It can contribute to proper display.

(10th Embodiment)
In the tenth embodiment, a battery pack using battery cells 6C which is another form with respect to the seventh embodiment will be described with reference to FIGS. 19 and 20. FIG. 19 is a front view for explaining a battery cell 6C constituting the battery pack of the tenth embodiment. FIG. 20 is a partial plan view illustrating a stacked structure of adjacent battery cells 6C.

  As shown in FIGS. 19 and 20, the stacked structure of the battery cell 6C is different from the stacked structure of the battery cell 6 shown in the seventh embodiment in that the plate-like protrusion 64A and the plate-like protrusion 66A are stacked in the stacking direction X. Is different in that the side surfaces 6a and 6b of the battery cell orthogonal to the side are arranged in the downstream portion 6a2 more than the upstream portion 6a1 of the cooling fluid flow. Other structures are the same and have the same effects.

  The plate-like protrusions 64A and 66A located at the center portion 6a3 in the Y direction of the side surfaces 6a and 6b of the battery cell are respectively plate-like protrusions 64 and 64a located at both side portions 6a4 as shown in FIGS. It is shorter in the flow direction F of the cooling fluid than 66 and is not disposed in the upstream portion 6a1 of the cooling fluid flow, but is disposed only in the downstream portion 6a2. Therefore, since the number of plate-like protrusions per unit area on the side surfaces 6a and 6b of the battery cell is smaller in the upstream portion 6a1 than in the downstream portion 6a2 of the cooling fluid flow, the heat transfer area per unit area is also low in the cooling fluid flow. It is less on the upstream side than on the downstream side of the central portion of.

  According to such a configuration, the heat transfer area in the central portion of the side surfaces 6a and 6b of the battery cell can be made smaller in the upstream portion 6a2 than in the downstream portion 6a2 of the cooling fluid flow. Accordingly, when the heat generation density in the central upstream portion of the battery cell 6C is low, it is possible to promote the cooling of the battery cell 6C by the cooling fluid at both side portions of the battery cell 6C and the downstream portion of the central portion. Thus, if the cooling capacity on the side surfaces 6a and 6b of the battery cell can be changed according to the difference in the partial heat generation density of the battery cell 6C, the temperature variation between the battery cell 6C parts can be suppressed, and the battery performance can be reduced. It can contribute to proper display.

(Eleventh embodiment)
In the eleventh embodiment, a battery pack using battery cells 6D which are other forms than the tenth embodiment will be described with reference to FIG. FIG. 21 is a front view for explaining a battery cell 6D constituting the battery pack of the eleventh embodiment.

  As shown in FIG. 21, the laminated structure of the battery cell 6D is a plate-like protrusion arranged in the downstream part 6a2 but not in the upstream part 6a1 with respect to the laminated structure of the battery cell 6C shown in the tenth embodiment. The point 64A and the plate-like protrusions 66A are provided in the entire region in the Y direction, and the point that the plurality of plate-like protrusions are arranged in the center side portion 6a3 more than the both side portions 6a4 in the direction Y in which the plurality of plate-like protrusions are arranged. , Is different. The eleventh embodiment also has the same operational effects as the tenth embodiment.

  That is, the stacked structure of the battery cell 6D is a configuration in which the heat transfer area is changed in the direction Y in which the plurality of plate-like protrusions are arranged on the side surface 6a of the battery cell with respect to the stacked structure of the battery cell 6 shown in the seventh embodiment. It is different in having. As an example of such a configuration, in the eleventh embodiment, the plate-like protrusions are located on the center side portion 6a3 of the side surface 6a of the battery cell orthogonal to the stacking direction X, rather than the both side portions 6a4 in the direction Y in which the plurality of plate-like protrusions are arranged. Many 64A are arranged. Other configurations are the same as those of the seventh embodiment, and the same operational effects are achieved.

  Thus, according to the structure which concerns on arrangement | positioning of the plate-shaped protrusion 64A of 11th Embodiment, the heat transfer area in the side surface 6a of a battery cell is a center side rather than the both-sides part 6a4 of the direction Y in which a some plate-shaped protrusion is arranged. The portion 6a3 can be enlarged. Thereby, in the width in which the cooling fluid passages formed between the battery cells 6D are arranged, it becomes possible to promote the cooling of the battery cell 6D by the cooling fluid at the center side rather than the both sides, and the center side portion of the battery cell 6D. When the heat radiation at 6a3 is large or when it is necessary to improve the cooling performance of the central portion 6a3, the cooling capacity in the direction Y in which the plurality of plate-like protrusions are arranged on the side surface 6a of the battery cell can be changed. They can also be close to each other. Thus, if the cooling capacity on the side surface 6a of the battery cell can be changed according to the difference in the partial heat generation density of the battery cell 6D, the temperature variation between the battery cell 6D parts can be suppressed, and the battery performance can be improved. It can contribute to proper display.

(Other embodiments)
In the above-described embodiment, the preferred embodiment of the present invention has been described. However, the present invention is not limited to the above-described embodiment, and various modifications can be made without departing from the spirit of the present invention. It is.

  In the above-described embodiment, each of the enlarged protrusion 23, the plate-like protrusion 241, the enlarged protrusion 43, the plate-like protrusion 44, etc. is a separate member on which the respective parts are formed with respect to the outer case of the battery cell. It may be integrally formed on the side surface of the battery cell by integral molding such as fixing or insert molding, or may be formed directly on the outer case of the battery cell.

  In the above embodiment, each of the enlarged protrusion 23, the plate-like protrusion 241, the enlarged protrusion 43, the plate-like protrusion 44, and the like provided on the side surface of the battery cell is described so as to be in contact with the adjacent battery cell side. However, this may be a form in which each part directly contacts the exterior case of the adjacent battery cell, or directly contacts each part provided on the side surface of the adjacent battery cell. Form may be sufficient.

DESCRIPTION OF SYMBOLS 1 ... Battery pack 2, 4 ... Battery cell 23 ... Expansion protrusion 43 ... Expansion protrusion 44,241 ... Plate-shaped protrusion 64, 64A ... Plate-shaped protrusion F ... Flow direction of cooling fluid X ... Stacking direction Y ... Direction in which multiple plate-like protrusions are arranged

Claims (17)

The plurality of stacked battery cells (2) are configured to be pressed and held together in the stacking direction (X), and a cooling fluid is allowed to flow through a passage formed between adjacent battery cells. In the battery pack (1) to be cooled,
A plate-like protrusion provided on a side surface of the battery cell orthogonal to the stacking direction (X) so as to extend in the flow direction (F) of the cooling fluid, and orthogonal to the flow direction (F) of the cooling fluid A plurality of plate-like protrusions (241) provided so as to be aligned in the direction (Y) and forming the passage between adjacent battery cells;
A plurality of enlarged protrusions provided in the middle of the plate-like protrusions extending in the flow direction (F) of the cooling fluid and receiving the acting force from the adjacent battery cells in contact with the adjacent battery cell side (23)
The battery pack, wherein the enlarged protrusion (23) is formed such that an outer dimension in a direction (Y) in which the plurality of plate-like protrusions are arranged is larger than a plate thickness dimension of the plate-like protrusion. .   The battery pack according to claim 1, wherein the enlarged protrusions and the plate-like protrusions are alternately arranged in a direction (Y) in which the plurality of plate-like protrusions are arranged.   The enlarged protrusion or the plate-like protrusion is formed on a member separate from the battery cell, and the separate member is provided on a side surface of the battery cell orthogonal to the stacking direction (X). The battery pack according to claim 1 or 2, wherein:   The expansion protrusion and the plate-like protrusion are formed on the same member, and the same member is provided on a side surface of the battery cell orthogonal to the stacking direction (X). The battery pack according to claim 1 or 2.   The battery pack according to claim 4, wherein the same member is a spacer sandwiched between the adjacent battery cells. The enlarged protrusion or the plate-like protrusion and the outer case of the battery cell are formed of a conductive material,
At least one of the contact portion with the adjacent battery cell side in the enlarged protrusion or the plate-like protrusion and the contact portion with the enlarged protrusion or the plate-like protrusion on the adjacent battery cell side is insulative. The battery pack according to claim 1, wherein the battery pack is coated with a substance.   The battery pack according to claim 1, wherein the enlarged protrusion and the plate-like protrusion are formed integrally with an outer case of the battery cell. A plurality of stacked battery cells (4) are pressed and held together in the stacking direction (X), and a cooling fluid is caused to flow through a passage formed between adjacent battery cells so that each battery cell is In the battery pack to cool,
A plate-like protrusion (44) extending in the flow direction (F) of the cooling fluid on a side surface of the battery cell perpendicular to the stacking direction (X) (Y) perpendicular to the flow direction (F) of the cooling fluid A plurality of plate-like protrusions (44) that are arranged side by side and form the passage between adjacent battery cells,
A direction perpendicular to the flow direction (F) of the cooling fluid is formed on the side surface of the battery cell perpendicular to the stacking direction (X), with an enlarged protrusion (43) extending in the flow direction (F) of the cooling fluid. (Y) provided at intervals, and provided with a plurality of enlarged protrusions (43) that contact the adjacent battery cell side and receive the acting force from the adjacent battery cell,
The enlarged protrusion (43) is formed such that the width dimension in the direction (Y) in which the plurality of plate-like protrusions are arranged is larger than the thickness dimension of the plate-like protrusion,
A battery pack, wherein a plurality of the plate-like protrusions are arranged side by side between the enlarged protrusions (43) provided at an interval.   The plate-like protrusions (64A) are arranged more on the downstream side than the upstream side of the cooling fluid flow on the side surface of the battery cell orthogonal to the stacking direction (X). The battery pack described in 1.   The plate-like protrusions (64A) are arranged more on the center side than both sides in the direction (Y) in which the plurality of plate-like protrusions are arranged on the side surface of the battery cell orthogonal to the stacking direction (X). The battery pack according to claim 8 or 9, wherein   The plate-like protrusions (64) are arranged more on both sides of the side surface of the battery cell perpendicular to the stacking direction (X) than the center side in the direction (Y) in which the plurality of plate-like protrusions are arranged. The battery pack according to claim 8 or 9, wherein   The enlarged protrusion or the plate-like protrusion is formed on a member separate from the battery cell, and the separate member is provided on a side surface of the battery cell orthogonal to the stacking direction (X). The battery pack according to any one of claims 8 to 11, wherein:   The enlarged protrusions and the plate-like protrusions are formed on the same member, and the same member is provided on a side surface of the battery cell orthogonal to the stacking direction (X). The battery pack according to any one of claims 8 to 11.   The battery pack according to claim 13, wherein the same member is a spacer sandwiched between the adjacent battery cells. The enlarged protrusion or the plate-like protrusion and the outer case of the battery cell are formed of a conductive material,
At least one of the contact portion with the adjacent battery cell side in the enlarged protrusion portion or the plate-like protrusion portion and the contact portion with the enlarged protrusion portion or the plate-like protrusion portion on the adjacent battery cell side, The battery pack according to any one of claims 8 to 14, wherein the battery pack is coated with an insulating substance.   10. The battery pack according to claim 8, wherein the enlarged protrusions and the plate-like protrusions are integrally formed with an outer case of the battery cell. 11.   The battery pack according to any one of claims 1 to 16, wherein the plate-like protrusion has a tapered shape.

Images