WO2020031619A1 - Assembled battery - Google Patents

Abstract

This assembled battery comprises a plurality of battery cells (2) that form a battery layered article, a heat transfer medium flow path member (4; 104; 204; 304) provided so as to conduct heat exchange between the battery cells and a heat transfer medium flowing through an interior flow path, and a set of binding members (3; 44, 45) that are thermally conductive and are provided so as to be capable of conducting heat to battery cells on both sides of the battery layered article so that binding force is caused to operate on the battery layered article from both layering-direction sides. The interior flow path of the heat transfer medium flow path member communicates with a binding-member inner flow path (40, 42), which is provided to the interior of at least one binding member from among the set of binding members.

Description

Battery pack Cross-reference of related applications

This application is based on Japanese Patent Application No. 2018-147794 filed on Aug. 6, 2018, the contents of which are incorporated herein by reference.

開 示 The disclosure in this specification relates to an assembled battery.

Patent Document 1 describes a battery system having a cooling plate having a built-in cooling pipe through which a coolant for cooling a rectangular battery flows. The cooling plate is provided in a thermally coupled state on the lower surface, which is the surface opposite to the electrode terminals, on the surface of the battery block in which the plurality of prismatic batteries are fixed to the stacked body.

Japanese Patent No. 5183172

れ ば According to Patent Literature 1, further improvement is required for the battery system from the viewpoint of multifunctionality of the components.

目的 An object of the disclosure in this specification is to provide an assembled battery capable of achieving multifunctionality of constituent parts.

One of the disclosed assembled batteries includes a plurality of battery cells forming a battery stack, a heat medium passage member provided so that the heat medium flowing through the internal passage and the battery cells exchange heat, and a heat conduction member. And a pair of restraining members provided on both sides of the battery stack so as to be able to transfer heat to the battery cells so as to apply a restraining force to the battery stack from both sides in the stacking direction. . The internal passage of the heat medium passage member is connected to a passage inside the restraining member provided inside at least one restraining member of the set of restraining members.

According to this battery pack, the heat medium flows through the internal passage of the heat medium passage member and exchanges heat with the battery cells, and also flows through the passage inside the restraining member and exchanges heat with the battery cells adjacent to the restraining member. I do. Accordingly, the restraining member has both a restraining function of restraining the plurality of battery cells in the stacking direction and a temperature adjusting function of controlling the temperature of the battery cells. Therefore, it is possible to provide an assembled battery that can achieve multifunctionality of constituent parts.

FIG. 2 is a perspective view showing the battery pack of the first embodiment. FIG. 3 is a perspective view illustrating a heat medium passage member according to the first embodiment. FIG. 3 is a partial cross-sectional view illustrating a configuration relating to a connection between a passage in a constraint plate and a pipe in the first embodiment. It is the fragmentary top view which showed the battery pack of 2nd Embodiment. FIG. 9 is a perspective view illustrating a heat medium passage member according to a second embodiment. It is the fragmentary top view which showed the battery pack of 3rd Embodiment. It is the fragmentary top view which showed the battery pack of 4th Embodiment.

Hereinafter, a plurality of embodiments for carrying out the present disclosure will be described with reference to the drawings. In each embodiment, portions corresponding to the items described in the preceding embodiment are denoted by the same reference numerals, and redundant description may be omitted. When only a part of the configuration is described in each embodiment, the other embodiments described above can be applied to other parts of the configuration. Not only the combination of the parts that clearly indicate that a combination is possible in each embodiment, but also the embodiments can be partially combined without being specified, unless there is any particular problem with the combination. It is also possible.

(1st Embodiment)
The battery pack 100 of the first embodiment is an apparatus having a configuration in which a plurality of battery cells 2 stacked and a heat medium flowing through an internal passage of the heat medium passage member 4 exchange heat. The heat medium is a temperature-regulating fluid that can cool or heat the battery cells to adjust the temperature. The heat medium is a gas, a liquid, or a gas-liquid mixed fluid, or may be a fluid that does not undergo a state change during use or a fluid that undergoes a phase change. The assembled battery 100 is mounted on an electric vehicle such as a hybrid vehicle using a driving power source by combining an internal combustion engine and a motor driven by electric power charged in the battery, and an electric vehicle using a motor as a driving power source. The plurality of battery cells 2 included in the assembled battery 100 are, for example, a nickel hydride secondary battery, a lithium ion secondary battery, an organic radical battery, an all-solid battery, and the like.

The first embodiment will be described with reference to FIGS. In each of the drawings, the thickness direction of the battery cell 2 is the stacking direction of the battery cells 2 in the battery stack, and is also referred to as the battery stacking direction. The direction orthogonal to both the stacking direction and the vertical direction is the width direction or the lateral direction of the battery cell 2. One side in the stacking direction is the upstream side of the heat medium flowing generally with respect to the battery stack, and the other side is the downstream side.

The battery pack 100 is controlled by electronic components used for charging and discharging the plurality of battery cells 2 or controlling the temperature. The battery pack 100 is formed integrally by constraining a plurality of battery cells 2 that are connected to be able to conduct electricity and are stacked and installed in the stacking direction. Further, the battery pack 100 may be housed in a housing. The above-mentioned electronic components are, for example, a DC / DC converter, a motor driving a fluid driving device for flowing a heat medium, an electronic component controlled by an inverter, various electronic control devices, and the like. The battery pack 100 may be a device including such electronic components.

電池 The battery cells 2 constituting the battery stack are unit cells having a rectangular outer case. The rectangular unit cell has a rectangular parallelepiped shape whose outer peripheral surface is covered by an outer case made of, for example, aluminum, an aluminum alloy, or the like. In each battery cell 2, each of two electrode terminals 20 composed of a positive electrode terminal and a negative electrode terminal protrudes from the upper surface 21 of the outer case, and the direction of the protrusion is an upward direction perpendicular to the battery stacking direction. The outer case of the battery cell 2 may be formed of, for example, resin in addition to metal. Further, the battery cell 2 may include a film in which a resin and an aluminum foil are laminated as an outer case.

The battery stack is formed integrally by sandwiching a battery stack in which a predetermined number of battery cells 2 are stacked by a pair of restraining plates 3 from both ends in the stacking direction and applying a restraining force inward. The set of constraint plates 3 is an example of a set of constraint members that exert a constraint force on the battery stack from both sides in the stacking direction. The constraining plates 3 may be in contact with the battery cells 2 on both sides in the stacking direction of the battery stack, or may be integrally installed with the battery cells 2 via a spacer member having thermal conductivity. Configuration. The restraint plate 3 is also called an end plate because it is installed at the end of the battery stack.

The constraining plate 3 is formed in a flat box whose dimension in the thickness direction is smaller than the length in the vertical direction and the length in the width direction. The restraint plate 3 includes an upper surface 30, a lower surface 32 facing the upper surface 30, a pair of vertically elongated side surfaces 33 adjacent to the upper surface 30 and the lower surface 32, and an inner width surface 31 facing the adjacent battery cell 2. , And an outer width surface facing the width surface 31. The width surface 31 is also the abdominal surface having the largest area in the constraint plate 3. The assembled battery 100 includes the heat medium passage member 4 integrally provided on at least one surface of the battery stack. As shown in FIG. 2, the heat medium passage member 4 is integrally provided on the lower surface of the battery stack. The heat medium passage member 4 is formed of a material having thermal conductivity, for example, a metal containing aluminum, a metal containing copper, a resin material containing a metal, a carbon resin material, or the like.

A set of restraint plates 3 are provided on both sides of the battery stack of the battery pack 100 in the stacking direction so that heat can be transferred to the battery cells 2. The constraining plate 3 is formed of a material having thermal conductivity, for example, a metal containing aluminum, a metal containing copper, a resin material containing a metal, a carbon resin material, or the like. When the restraining plate 3 is made of metal, it can be manufactured by casting such as a die casting method, and when it is made of resin, it can be manufactured by molding using a mold.

(4) The restraining structure of the battery pack 100 will be described. As shown in FIG. 1, the battery pack 100 includes a plurality of battery cells 2, a set of restraint plates 3, a restraint band 5 that applies a compressive force to the set of restraint plates 3 from both sides, and the like. The restraining band 5 includes a holding portion 50 disposed in the stacking direction with respect to the battery stack so as to cover a part of the side surface 23 of the battery cell 2 and fixing portions 51 provided at both ends of the holding portion. Have. In this case, the constraining band 5 is a band-like member that surrounds the outer periphery of the stacked structure in which the battery stack and the set of the constraining plates 3 are combined.

(4) The battery pack 100 is restrained by two restraining bands 5 provided on the respective side surfaces 23 at intervals in the vertical direction. The restraining band 5 maintains a state in which a required restraining force is provided to the battery stack because the fixing portion 51 of the restraining band 5 is fixed to each restraining plate 3 by a rivet. Further, the rivet can be replaced with fastening means such as bolts and nuts, and fixing means such as welding. The restraining band 5 is formed of a material having excellent strength such as a metal or a hard resin material so that the plurality of battery cells 2 and the like can be pressed and integrated with a stable force.

As shown in FIG. 2, of the set of constraint plates 3, inside the constraint plate 3 located on one side, an inflow-side connection portion 40 a into which the heat medium flows and an outflow-side connection portion 42 c through which the heat medium flows out. Are provided. The inflow-side connection portion 40a and the outflow-side connection portion 42c are provided near the lower surface 32 of the constraint plate 3, and communicate with two openings formed in the lower surface 32, respectively. The constraining plate 3 is provided with through holes 3a and 3b through which bolts 6 which are fixing tools for fixing to the installation portion 10 are inserted so as to penetrate the constraining plate 3 vertically at its widthwise end. ing.

The one restraining plate 3 includes an upstream restraining member passage 40 that connects the inflow side connecting portion 40a and the heat medium passage 41 in the heat medium passage member 4, a heating medium passage 41 and the outflow side connecting portion 42c. And a passage 42 inside the restraining member on the downstream side for communicating with the inside. The passage 40 in the restricting member extends in a U-shape along the width surface 31 of the restricting plate 3 so that the folded portion 40b is located at the upper portion from the inflow side connecting portion 40a at the upstream end to the downstream end 40c. The passage 42 in the restricting member extends in a U-shape along the width surface 31 of the restricting plate 3 so that the folded portion 42b is located at the upper portion from the upstream end 42a to the outflow-side connecting portion 42c at the downstream end. The restraining member passage 42 is provided so as to be adjacent to the restraining member passage 40 in the width direction. The restraining member inner passage 40 and the restraining member inner passage 42 are passages having a length in the vertical direction equal to the vertical length of the adjacent battery cell 2. The restraining member passage 40 and the restraining member passage 42 are provided such that the folded portion 40b and the folded portion 42b overlap the adjacent battery cells 2 in the stacking direction. The passage 40 in the restraining member and the passage 42 in the restraining member are provided so that the whole in the width direction overlaps the adjacent battery cell 2 in the stacking direction. According to the passages 40 and 42 in the restraining member having each of these components, it contributes to enhancing the temperature control function for the battery cell 2.

(4) The heat medium passage member 4 includes a plate portion having therein a heat medium passage 41 facing the lower surface of the battery stack. In the plate portion, through-holes 4 a for inserting bolts 6, which are fixing tools for fixing to the installation portion 10, are provided at four corners. The through holes 4a are provided at positions corresponding to the through holes 3a, 3b of the restraint plate 3. The heat medium passage 41 is a passage through which the heat medium flows in a U-shape such that the heat medium returns from one side in the stacking direction to the other side via the other side inside the plate portion. The heat medium passage 41 is a U-shaped passage extending from the upstream passage 41a to the downstream passage 41c such that the folded portion 41b is located on the other side. The upstream passage 41a is connected to the downstream end 40c of the restraining member inner passage 40 at the upstream end, and is connected to the turn-back portion 41b at the downstream end. The downstream passage 41c is connected to the folded portion 41b at the upstream end, and is connected to the upstream end 42a of the restraining member inner passage 42 at the downstream end.

The one constraining plate 3 is an inflow tank portion that introduces a heat medium from outside the battery pack 100 into the heat medium passage member 4, and heat medium from inside the heat medium passage member 4 to the outside of the battery pack 100. This is the outflow tank part that flows out. In the battery pack 100, the heat medium flows through the heat medium passage member 4 through the internal passage, so that the heat of the battery cells 2 is absorbed by the heat medium via the plate portion and the lower surface of the battery cells 2, thereby cooling each battery cell 2. can do. In addition, since the heat medium flows through the heat medium passage member 4 through the internal passage, heat of the heat medium is radiated to the battery cells 2 via the plate portion and the lower surface of the battery cells 2, so that each battery cell 2 can be heated. .

各 As shown in FIG. 3, each restraining plate 3 is fixed to the installation part 10 by bolts 6 and nuts 61. The pipe 7 is fixed to the installation section 10 by a pipe fixing member 70 and a screw 71. The pipe fixing member 70 is a member that presses and holds the pipe 7 toward the installation section 10 below. The screw 71 can screw-fix the pipe fixing member 70 in the state where the pipe 7 is pressed and held against the installation section 10 to the installation section 10.

Pipe 7 is a supply pipe or an inflow pipe. The pipe 7 is formed in a shape extending upward from the shape along the surface of the installation part 10 at the end. The end of the pipe 7 extending upward is installed so as to fit into the inflow-side connection portion 40a and the outflow-side connection portion 42c that open downward. A seal member 72 such as an O-ring is provided between the end of the pipe 7 and the inflow side connection portion 40a or the outflow side connection portion 42c.

In the state shown in FIG. 3, when the fixing tool including the bolt 6 and the nut is tightened to increase the fixing force, the restraining plate 3 moves in a direction approaching the installation part 10. With the approach movement of the restraint plate 3, the end of the pipe 7 and the inflow-side connection portion 40a and the outflow-side connection portion 42c come into deep engagement. In other words, the end of the pipe 7 and the inflow-side connection portion 40a and the outflow-side connection portion 42c are fitted in the direction in which the constraint plate 3 approaches the installation portion 10 by the fixing force of the fixture. By fixing the pipe 10 to the pipe 10, the pipe connection to the restraint plate 3 can be performed.

The operation and effect provided by the battery pack 100 of the first embodiment will be described. The battery pack 100 includes a battery stack, a heat medium passage member 4 for exchanging heat between the heat medium flowing through the internal passages and the battery cells 2, and having thermal conductivity from both sides in the stacking direction with respect to the battery stack. A pair of restraining members provided on both sides of the battery stack so as to apply heat to the battery cells 2 so as to apply heat. The internal passage of the heat medium passage member 4 is connected to the internal passages 40 and 42 of the restriction member provided inside at least one of the restriction members.

According to the battery pack 100, the heat medium flows through the internal passage of the heat medium passage member 4, exchanges heat with the battery cells 2, and also flows through the passages 40, 42 in the restraining member. Since the heat medium flowing through the restraining member passages 40 and 42 exchanges heat with the battery cells 2 adjacent to the restraining member, the restraining member has a restraining function of restraining the plurality of battery cells 2 in the stacking direction and a temperature control of the battery. It can also have an adjustable temperature control function. Therefore, the battery pack 100 can provide a product that can achieve multi-functionality of the constituent parts.

The restraining member has an inflow-side connecting portion 40a to which a supply pipe for supplying the heat medium to the restraining member passage 40 can be connected, and an outflow-side connection to which an outflow pipe through which the heating medium flows out from the restraining member passage 42 can be connected. A portion 42c is provided inside. According to this configuration, the supply pipe for supplying the heat medium to the internal passage of the heat medium passage member 4 and the outflow pipe for taking out the heat medium to the outside can be connected inside the restraining member. Accordingly, since the pipe connection portion does not protrude outside the battery pack 100, an occupied space including the pipe connection portion and the battery pack 100 can be formed compactly.

The assembled battery 100 includes a fixture for fixing the restraining member to the installation section 10. The outlet portion of the supply pipe and the inflow side connection portion 40a are fitted in a direction in which the restraining member approaches the installation portion 10 by the fixing force of the fixing tool. According to this configuration, by fixing the restraining member to the installation portion 10 with the fixture, the outlet portion of the supply pipe and the inflow side connection portion 40a can be fitted more deeply, so that the pipe connection is easily performed. be able to. Thereby, the configuration for connecting the supply pipe to the passage 40 in the restraining member can be simplified, and the connection workability can be improved. Further, by providing a configuration in which the seal member 72 is interposed between the outlet of the supply pipe and the inflow-side connecting portion 40a, it is possible to provide the battery pack 100 having both the sealing property and the improvement of the workability.

入口 The inlet of the outflow pipe and the outflow-side connecting portion 42c are fitted in a direction in which the restraining member approaches the installation portion 10 by the fixing force of the fixing tool. According to this configuration, by fixing the restraining member to the installation portion 10 by the fixing tool, the outlet portion of the outflow pipe and the outflow side connection portion 42c can be fitted more deeply, so that the pipe connection is easily performed. be able to. Thereby, the configuration for connecting the outflow pipe to the passage 40 in the restricting member can be simplified, and the connection workability can be improved. Further, according to this configuration, for example, the pipe connection can be performed without using a means by screwing a male screw and a female screw. Further, by providing a configuration in which the seal member 72 is interposed between the outlet portion of the outflow pipe and the outflow side connection portion 42c, it is possible to provide the battery pack 100 having both the sealing property and the improvement of the workability.

拘束 Of the set of restricting members, the restricting member provided on one side in the stacking direction has an inflow side connection portion 40a and an outflow side connection portion 42c therein. According to this configuration, the heat medium that has flowed from the supply pipe into the restraining member passage 40 inside the one restraining member flows through the inner passage of the heating medium passage member 4 and exchanges heat with the battery cells 2. It flows out into the outflow pipe through the restraining member passage 42 inside the one restraining member. Accordingly, it is possible to provide the battery pack 100 having a heat medium flow path in which the heat medium flowing through the inside of the one restraining member and the battery cells 2 exchange heat.

(2nd Embodiment)
A second embodiment will be described with reference to FIGS. Configurations, operations, and effects that are not particularly described in the second embodiment are the same as those in the first embodiment, and only different points from the first embodiment will be described. The battery pack 200 of the second embodiment is an apparatus having a configuration in which a plurality of battery cells 2 stacked and a heat medium flowing inside the inter-cell portion 140 exchange heat.

The assembled battery 200 includes a plurality of battery cells 2, an inter-cell portion 140 interposed between adjacent battery cells 2, a connecting portion 141 connecting between the adjacent inter-cell portions 140, a set of constraint plates 3, and a set of constraints. The plate 3 is provided with a restraining band 5 for providing a restraining force from both sides. In the battery stack, a set in which a predetermined number of battery cells 2 and inter-cell portions 140 of the heat medium passage member 104 are alternately stacked is sandwiched by a set of restraint plates 3 from both ends in the stacking direction, and a restraining force directed inward is provided. Are formed integrally.

(4) The heat medium passage member 104 includes a plurality of inter-cell portions 140 interposed between the battery cells 2 adjacent in the stacking direction. A heat medium flows through the internal passage of the inter-cell portion 140. The plurality of inter-cell portions 140 are arranged so as to be arranged in the stacking direction. A space between the inter-cell portions 140 adjacent to each other in the stacking direction is provided with an interval equivalent to the thickness of the battery cell 2 in the stacking direction. The inter-cell portion 140 is installed in a state of being in contact with the width surface of the battery cell 2 which forms a surface in the width direction and the vertical direction. The width surface is also the belly surface having the largest area in the battery cell 2. Further, a spacer member having thermal conductivity may be interposed between the battery cell 2 and the inter-cell portion 140 so that the spacer member is sandwiched between the battery cell 2 and the inter-cell portion 140.

(4) The heat medium passage member 104 includes a connecting portion 141 connecting the inter-cell portions 140 adjacent to each other in the stacking direction. The heat medium flows through the internal passage of the connecting portion 141. The connecting portion 141 is provided so as to be located outside the battery cell 2 in the width direction of the battery cell 2. The connecting portion 141 is provided so as to face the side surface 23 of the battery cell 2 orthogonal to both the upper surface 21 and the width surface.

The connection portion 141 is a turn portion that turns back the heat medium flowing inside the heat medium passage member 104 and changes the direction of the flow to form turn-back channels facing each other, and is also a turn portion. The connecting portion 141 is a folded portion that changes the direction of the flow path to the opposite direction, and is provided at at least one position in the heat medium passage member 104. The heat medium passage member 104 forms a meandering flow path as shown in FIGS. 4 and 5 by continuously stacking folded flow paths via the connecting portion 141.

(4) The heat medium passage member 104 includes an inflow portion 142a into which the heat medium flows into an end of the folded flow path in the stacking direction, that is, the battery stacking direction. The inflow portion 142a is connected to the passage 40 in the restricting member of the restricting plate 3 provided on one side in the stacking direction. The restraining member internal passage 40 is a passage extending flat along the width surface 31 of the restraining plate 3, and is formed inside the restraining plate 3. The restraining member inner passage 40 is provided inside the restraining plate 3 so as to extend in a band shape or a flat shape from the inflow portion 142a located on one side in the width direction to the inflow side connection portion 40a located on the other side. The restraining member inner passage 40 is formed in a belt shape or a flat shape having the same length in the vertical direction as the inter-cell portion 140. The entirety of the restraining member passage 40 in the vertical direction is provided so as to overlap with the adjacent inter-cell portion 140 in the stacking direction. The restraining member inner passage 40 is provided so that the whole in the width direction overlaps with the adjacent inter-cell portion 140 in the laminating direction. It is preferable that the restraining member inner passage 40 is provided so as to entirely overlap the adjacent inter-cell portion 140 in the stacking direction. The passage 40 in the restraining member having each of these components contributes to enhancing the temperature control function for the battery cell 2.

The internal passage of the inter-cell portion 140 located at the end in the battery stacking direction and located at the upstream end of the heat medium is connected to the internal passage of one of the restraining plates 3 via the internal passages of the folded portion 142 and the inflow portion 142a. Communicating. A pipe for introducing a heat medium from the outside of the battery pack 100 is connected to the one constraint plate 3. The one constraining plate 3 is an inflow tank portion for introducing a heat medium from outside the battery pack 100 into the heat medium passage member 104. The one constraining plate 3 is capable of conducting heat to the battery cells 2 such that the battery cells 2 located at one end of the battery stack and the heat medium flowing through the internal passage exchange heat. It is provided in.

(4) The heat medium passage member 104 includes an outflow portion 143a through which the heat medium flows out from an end of the folded flow path in the stacking direction, that is, the battery stacking direction. The outflow portion 143a is connected to the passage 42 in the restricting member of the restricting plate 3 provided on the other side in the stacking direction. The restraining member internal passage 42 is provided in the restraining plate 3 so as to extend in a band shape or a flat shape from the outflow portion 143a located on one side in the width direction to the outflow side connection portion 42c located on the other side. The restraining member passage 42 has a length equal to that of the inter-cell portion 140 in the vertical direction and is formed in a band shape or a flat shape. The restraining member inner passage 42 is provided so that the whole in the up-down direction overlaps with the adjacent inter-cell portion 140 in the stacking direction. The restraining member passage 42 is provided so that the whole in the width direction overlaps with the adjacent inter-cell portion 140 in the stacking direction. It is preferable that the entire passage 42 within the restraining member is provided so as to entirely overlap the inter-cell portion 140 adjacent thereto in the stacking direction. According to the passage 42 in the restricting member having these components, it contributes to enhancing the temperature control function for the battery cell 2.

The internal passage of the inter-cell part 140 located at the end in the battery stacking direction and located at the downstream end of the heat medium is connected to the internal passage of the constraint plate 3 on the other side via the internal passages of the folded part 143 and the outflow part 143a. Communicating. A pipe that allows the heat medium to flow out of the battery pack 200 is connected to the other restraining plate 3. The other constraining plate 3 is an outflow tank portion that allows the heat medium to flow out of the heat medium passage member 104 to the outside of the battery pack 200. The restraint plate 3 on the other side is capable of conducting heat to the battery cells 2 so that the battery cells 2 located at the other end of the battery stack and the heat medium flowing through the internal passage exchange heat. It is provided in.

As described above, the heat medium passage member 104 includes the folded portion 142 and the five connecting portions 141 provided on the inflow portion 142a side and the five connected portions 141 and the folded portion 143 provided on the outflow portion 143a side. It has a meandering channel formed therethrough. The internal passage of the heat medium passage member 104 is a flat tube elongated in the flow direction when the heat medium exchanges heat with the battery cells 2, that is, in the vertical direction orthogonal to both the width direction and the stacking direction. The heat medium passage member 104 can be formed by a serpentine pipe obtained by bending the flat pipe. The flat tube may have a plurality of passages therein and may be a flat multi-hole tube formed by extrusion.

In the assembled battery 200, the heat medium flows through the heat medium passage member 4 through the internal passage, so that the heat of the battery cells 2 is absorbed by the heat medium via the inter-cell portions 140, thereby cooling the battery cells 2. . In addition, since the heat medium flows through the heat medium passage member 104 through the internal passage, the heat of the heat medium is radiated to the battery cells 2 through the inter-cell portions 140, so that each battery cell 2 can be warmed.

The operation and effect provided by the battery pack 200 of the second embodiment will be described. The heat medium passage member 104 is interposed between the battery cells 2 adjacent to each other in the stacking direction. The heat medium flowing through the internal passage and exchanging heat between the battery cells 2 and the intercellular portion 140 adjacent to each other in the stacking direction. There is provided a connecting portion 141 connecting the inter-cell portions 140 and the inter-cell portions 140 to each other and through which the heat medium flows through the internal passage. According to this configuration, it is possible to provide a restraining member that exerts a restraining function of restraining the heat transfer performance between the battery cell 2 and the inter-cell portion 140 so as to enhance the heat transfer performance, and a temperature controlling function for the battery cell 2 adjacent to the restraining member. . Therefore, it is possible to provide the assembled battery 200 in which the multifunctionality of the restraining member can be achieved.

The inter-cell portion 140 and the connecting portion 141 are provided so as to form a series of internal passages through which a heat medium that exchanges heat with all the battery cells 2 flows from one end to the other end in the stacking direction of the battery stack. ing. According to this configuration, a restraining function for restraining all the battery cells 2 included in the battery stack and the inter-cell portion 140 so as to enhance the heat transfer performance, and a temperature control function for the battery cells 2 adjacent to the restraining member are provided. Can be provided.

One restraining member adjacent to the battery cell 2 at one end of the pair of restraining members has an inflow-side connecting portion 40a to which a supply pipe for supplying a heat medium to the restraining member passage 40 can be connected. Have. Further, the other restraining member adjacent to the battery cell 2 at the other end has an outflow-side connecting portion 42c to which an outflow pipe through which the heat medium flows out from the restraining member internal passage 42 can be connected. According to this configuration, the heat medium that has flowed from the supply pipe into the restraining member passage 40 inside the one restraining member flows through the inner passage of the heating medium passage member 4 and exchanges heat with all the battery cells 2. Flows out into the outflow pipe through the restraining member passage 42 inside the one restraining member. Thereby, the restraining function of restraining so as to enhance the heat transfer performance between all the battery cells 2 and the inter-cell portion 140 included in the battery stack, and the temperature control function for the battery cells 2 adjacent to each restraining member are provided. A set of restraining members that can be provided can be provided.

(Third embodiment)
A third embodiment will be described with reference to FIG. In FIG. 6, components having the same configuration as that of the above-described embodiment are denoted by the same reference numerals, and have similar functions and effects. Configurations, operations, and effects that are not particularly described in the third embodiment are the same as those in the above-described embodiment, and only differences from the above-described embodiment will be described.

組 As shown in FIG. 6, the battery pack 300 of the third embodiment differs from the second embodiment in the configuration of the heat medium passage member 204. The heat medium passage member 204 included in the assembled battery 300 has a configuration in which the inter-cell portion 140 is interposed only between specific battery cells 2 among all the adjacent battery cells 2 constituting the battery stack. Therefore, the heat medium passage member 204 includes a configuration including at least one inter-cell portion 140.

(Fourth embodiment)
A fourth embodiment will be described with reference to FIG. In FIG. 7, components having the same configuration as that of the above-described embodiment are denoted by the same reference numerals, and have similar functions and effects. Configurations, operations, and effects that are not particularly described in the fourth embodiment are the same as those in the above-described embodiment, and only differences from the above-described embodiment will be described.

組 As shown in FIG. 7, the battery pack 400 of the fourth embodiment includes a stacked tube portion 44 and a stacked tube portion 45 having the same function as the restraining plate 3 as the restraining member in the above-described embodiment. Therefore, the battery pack 400 does not include the restraining plate 3 but includes a set of restraining members having the same operation and effect as the above-described embodiment.

The laminated tube portion 44 is a portion where the tubes forming the heat medium passage member 304 are formed by being bent plurally at one end of the battery laminated body. The laminated pipe section 44 constitutes a restraining member on the upstream side. The internal passage of the laminated pipe section 44 is an internal passage of the restriction member on the upstream side. The stacked tube portion 44 is integrally provided so as to be able to transfer heat to the battery cell 2 located at one end in the battery stack. The stacked tube portion 44 may be in contact with the battery cell 2 at one end, or a spacer member having thermal conductivity may be interposed between the battery cell 2 and the stacked tube portion 44 to form a spacer member. You may comprise so that it may be pinched by the battery cell 2 and the laminated | stacked tube part 44.

The stacked tube portion 45 is a portion in which the tube forming the heat medium passage member 304 is formed by being bent plural times on the other end side of the battery stack. The laminated pipe part 45 constitutes a restraining member on the downstream side. The internal passage of the laminated tube portion 45 is a passage inside the restraining member on the downstream side. The laminated tube portion 45 is integrally installed so as to be able to transfer heat to the battery cell 2 located at the other end in the battery laminate. The stacked tube portion 45 may be in contact with the battery cell 2 at the other end, or a spacer member having thermal conductivity may be interposed between the battery cell 2 and the stacked tube portion 45 to form the spacer member. You may comprise so that it may be pinched by the battery cell 2 and the laminated | stacked tube part 45. Therefore, the internal passage of the heat medium passage member 304 through which the heat medium that exchanges heat with the battery cell 2 flows is connected to the internal passage of the restriction member provided inside each of the pair of restriction members.

According to the battery pack 400 of the fourth embodiment, the internal passage of the heat medium passage member 304 is connected to the internal passage of the restricting member provided inside each of the pair of restricting members. One set of the restraining members is formed by stacked tube portions 44 and 45 in which tubes forming the heat medium passage member 304 are stacked a plurality of times on both sides of the battery stack. According to this, the assembled battery having both the function of restraining the plurality of battery cells 2 in the stacking direction by the stacked tube portions 44 and 45 on both sides in the stacking direction and the temperature control function of adjusting the temperature of the battery cells 2 is provided. 400 can be provided. Further, the battery pack 400 has a large temperature control effect on the battery cells 2 located on the upstream side, which is one end side, and the battery cells 2 located on the downstream side, which is the other end side, without using a restraining plate. The rigidity for restraining the battery stack can be secured.

(Other embodiments)
The disclosure of this specification is not limited to the illustrated embodiments. The disclosure includes the illustrated embodiments and variations thereon based on those skilled in the art. For example, the disclosure is not limited to the combination of the components and elements shown in the embodiment, and can be implemented with various modifications. The disclosure can be implemented in various combinations. The disclosure may have additional parts that can be added to the embodiments. The disclosure includes those in which the components and elements of the embodiments are omitted. The disclosure encompasses the replacement or combination of parts, elements between one embodiment and another embodiment. The disclosed technical scope is not limited to the description of the embodiments. The technical scope disclosed is shown by the description of the claims, and should be construed to include all modifications within the meaning and scope equivalent to the description of the claims.

The assembled battery in the above-described embodiment is a stacked body of batteries formed by alternately stacking the battery cells 2 and the inter-cell portions 140, but the assembled battery capable of achieving the object disclosed in the specification is of this embodiment. It is not limited to. The battery pack includes one having a configuration in which the inter-cell portion 140 is interposed only between specific battery cells 2 among all the adjacent battery cells 2 constituting the battery stack. Further, the battery pack 100 includes at least one inter-cell portion 140.

Claims (9)

A plurality of battery cells (2) forming a battery stack;
A heat medium passage member (4; 104; 204; 304) provided so as to exchange heat between the heat medium flowing through the internal passage and the battery cells;
A set of heat conductive members provided on both sides of the battery stack so as to be able to transfer heat to the battery cells so as to act on the battery stack from both sides in the stacking direction. A restraining member (3; 44, 45);
With
An assembled battery in which the internal passage of the heat medium passage member is connected to a passage (40, 42) in a restraining member provided inside at least one of the restraining members of a set of the restraining members. The restraining member connects an inflow-side connecting portion (40a) to which a supply pipe for supplying the heat medium to the passage in the restraining member can be connected, and an outflow pipe through which the heating medium flows out from the passage in the restraining member. 2. The battery pack according to claim 1, further comprising a possible outlet-side connection (42 c). 3. A fixture (6) for fixing the restraining member to the installation part (10);
The battery pack according to claim 2, wherein the outlet portion of the supply pipe and the inflow side connection portion are fitted in a direction in which the restraining member approaches the installation portion by a fixing force of the fixing tool. A fixture (6) for fixing the restraining member to the installation part (10);
The battery pack according to claim 2, wherein an inlet portion of the outflow pipe and the outflow side connection portion are fitted in a direction in which the restraining member approaches the installation portion by a fixing force of the fixing tool. 5. The restraint member provided on one side in the stacking direction of the set of restraint members has the inflow-side connection portion and the outflow-side connection portion therein. 6. The battery pack according to any one of claims 1 to 4. The heat medium passage member includes an inter-cell portion (140) interposed between the battery cells adjacent to each other in the stacking direction and exchanging heat between the heat medium flowing through the internal passage and the battery cells. 5. The device according to claim 1, further comprising: a connecting portion that connects the inter-cell portions adjacent in the stacking direction and the inter-cell portion, through which the heat medium flows through an internal passage. 6. The battery pack as described. The inter-cell portion and the connection portion form a series of the internal passages through which the heat medium that exchanges heat with all the battery cells flows from one end to the other end of the battery stack in the stacking direction. The battery pack according to claim 6, which is provided as follows. One of the restricting members, which is adjacent to the battery cell at the one end, has an inflow-side connection that can connect a supply pipe for supplying the heat medium to the passage in the restricting member. An outlet-side connecting portion which has a portion (40a) therein and which is adjacent to the battery cell at the other end portion and which is connectable to an outlet pipe through which the heat medium flows out from the passage in the restricting member. The battery pack according to claim 7, wherein (42c) is provided inside. The internal passage of the heat medium passage member is connected to the restraint member internal passage provided inside each of the set of restraint members,
2. The battery pack according to claim 1, wherein in the pair of restraining members, tubes forming the heat medium passage member are formed by stacking a plurality of turns on each side of the battery stack. .

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