JP2018018754A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack for improving cooling performance of a conductive member by forming a cooling fluid flow for directly cooling a conductive member connecting electrode terminals. SOLUTION: The battery pack 1 includes a bus bar 5 that connects adjacent electrode terminals 30a and 30b, a bus bar case 2 that supports the bus bar 5, and a fluid passage 70 through which air that contacts the bus bar 5 flows. And a cover member 7 installed so as to be formed between the cover member 7 and the cover member 5. Further, the battery pack 1 includes a protruding portion 71 that protrudes from the cover member 7 toward the bus bar 5 and is separated from the bus bar 5. At least a part of the projecting portion 71 exists in the space S1 formed by connecting the projection view of the bus bar 5 projected onto the cover member 7 and the outer shape of the bus bar 5. [Selection diagram] Fig. 3

Description

  The disclosure in this specification relates to a battery pack having a plurality of batteries electrically connected by a conductive member.

  The assembled battery described in Patent Document 1 is a battery that promotes heat dissipation by causing air to contact the cooling fins by flowing air as a coolant through a passage defined between the upper surface of the battery case and the bus bar and the insulating member. Is cooling. The bus bar is provided above and away from the upper surface of the battery case, and electrically connects the electrode terminals protruding from the upper surface of the battery case. The bus bar is integrally provided with a plurality of cooling fins extending in the downward direction and the air flow direction. The lower end of the cooling fin is located away from the upper surface of the battery case (see FIG. 6 of Patent Document 1).

Japanese Patent No. 5176682

  In the battery pack of Patent Document 1, in the passage between the upper surface of the battery case and the bus bar and the insulating member, there is no cooling fin near the upper surface of the battery case. For this reason, in the said channel | path, air becomes easy to flow toward the upper surface vicinity of a battery case rather than bus bar vicinity. Therefore, in the case of the assembled battery of Patent Document 1, there is a problem that it is difficult to form an air flow that directly contacts a bus bar that generates a large amount of heat.

  In view of such a problem, an object of the disclosure in this specification is to form a cooling fluid flow that directly cools the conductive member connecting the electrode terminals, thereby improving the cooling performance of the conductive member. Is to provide.

  A plurality of aspects disclosed in this specification adopt different technical means to achieve each purpose. In addition, the reference numerals in the parentheses described in the claims and in this section are examples showing the correspondence with the specific means described in the embodiments described later as one aspect, and limit the technical scope. is not.

  One of the disclosed battery packs includes a conductive member (5) for connecting the electrode terminal (30a) and the electrode terminal (30b) adjacent to each other in the battery cell (30) adjacent in the cell stacking direction (T1), and a conductive member. A battery stack (3), which is an assembly of a plurality of battery cells connected by each other, a support member (2) formed of an electrically insulating material and supporting a conductive member, and a cooling member that contacts the conductive member A cover member (7; 107; 207; 307) installed so as to form a fluid passage (70) through which the fluid flows, and the conductive member; and projecting from the cover member toward the conductive member; Projecting portions (71; 171; 27) that are at least partially present in a space (S1) formed by connecting the projection of the conductive member projected onto the cover member and the outer shape of the conductive member. ; Includes 871 and), a; 371; 471; 571; 671; 771.

  According to this battery pack, at least a part of the protrusion that protrudes from the cover member toward the conductive member and that is separated from the conductive member projects the conductive member onto the cover member in a direction perpendicular to the conductive member; It exists in a space formed by connecting the outer shape of the conductive member. Since the protrusion exists in the space on the cover member side away from the conductive member, the flow resistance on the cover member side is larger than the flow resistance on the conductive member side. As a result, in the portion where the conductive member is present in the fluid passage, the cooling fluid can easily flow toward the conductive member, and a flow that can easily bring the cooling fluid into contact with the conductive member can be formed. Therefore, it is possible to provide a battery pack that improves the cooling performance of the conductive member by forming a cooling fluid flow that directly cools the conductive member that connects the electrode terminals.

  One of the disclosed battery packs includes a conductive member (5) for connecting the electrode terminal (30a) and the electrode terminal (30b) adjacent to each other in the battery cell (30) adjacent in the cell stacking direction (T1), and a conductive member. A battery stack (3), which is an assembly of a plurality of battery cells connected by each other, a support member (2) formed of an electrically insulating material and supporting a conductive member, and a cooling member that contacts the conductive member The fluid passage (70) through which the fluid flows is communicated with the cover member (407) provided so as to be formed between the conductive member and the portion where the safety valve of the battery cell is provided, and intersects the fluid passage. A smoke exhaust passage (1250) provided so that a part of the fluid passage is interposed between the battery cells and a duct portion (provided in the cover member to form the smoke exhaust passage) 407b) and da Comprising protrusion protruding from the isolation portion in the fluid passage toward the battery cell and (407a), the.

  According to this battery pack, the protruding portion that protrudes from the duct portion toward the battery cell exists in the fluid passage that intersects the smoke exhaust passage. With this configuration, when the cooling fluid flowing through the fluid passage flows through the portion intersecting with the smoke passage, the fluid approaches the battery cell side by the protrusion or changes the direction toward the battery cell side. Therefore, it is possible to form a flow in which the cooling fluid is more easily brought into contact with the conductive member than on the cover member side. Thus, by forming a cooling fluid flow that directly cools the conductive member connecting the electrode terminals, a battery pack that improves the cooling performance of the conductive member can be provided.

It is a fragmentary perspective view which shows the structure of the battery pack of 1st Embodiment. It is a top view which shows a battery pack and an air blower. It is the fragmentary sectional view which looked at the III-III cross section in FIG. 2 in the arrow direction. It is a fragmentary sectional view which shows the structure of the protrusion part which exists in the fluid channel | path of a battery pack. It is a figure explaining the positional relationship of a cell lamination direction about a protrusion part and a bus bar. It is a figure explaining the positional relationship of a cell lamination direction about the other form of a protrusion part, and a bus bar. It is a figure explaining the positional relationship of the fluid flow direction about the other form of a protrusion part, and a bus bar. It is a figure explaining the positional relationship of the fluid flow direction about the other form of a protrusion part, and a bus bar. It is a figure explaining the positional relationship of the fluid flow direction about the other form of a protrusion part, and a bus bar. It is a fragmentary sectional view which shows the structure of the protrusion part which exists in the fluid channel | path of the battery pack of 2nd Embodiment. It is a fragmentary sectional view which shows the structure of the protrusion part which exists in the fluid channel | path of the battery pack of 3rd Embodiment. It is a fragmentary sectional view which shows the structure of the protrusion part which exists in the fluid passage of the battery pack of 4th Embodiment. It is a perspective view of the partial cross section which shows the structure of the protrusion part which exists in the fluid channel | path of the battery pack of 5th Embodiment.

  Hereinafter, a plurality of modes for carrying out the present disclosure will be described 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 indicate that combinations are possible in each form, but also forms may be partially combined even if they are not clearly specified, as long as there is no problem with the combination. Is possible.

(First embodiment)
The battery pack 1 of 1st Embodiment is demonstrated with reference to FIGS. In each figure, T1 is the cell stacking direction of the plurality of battery cells 30, W1 is the cell width direction or the flow direction of the cooling fluid, and H1 is the cell height direction. The cell stacking direction T <b> 1 is also the cell thickness direction of the rectangular parallelepiped battery cell 30. The cell width direction W1 is a direction perpendicular to both the cell stacking direction T1 and the cell height direction H1. In the battery pack 1, the cell height direction H1 is set in the vertical direction.

  The battery pack 1 can be applied to various types of electrical equipment that includes a plurality of battery cells 30. Various electric devices are, for example, a device having a storage battery, a computer, a vehicle, and the like. In the first embodiment, as an example, the battery pack 1 is used for a vehicle such as a hybrid vehicle that uses a combination of an internal combustion engine and a battery-driven motor as a travel drive source, and an electric vehicle that travels by a battery-driven motor. explain.

  The battery pack 1 can be attached to at least the battery case 4, the plurality of battery cells 30 accommodated in the battery case 4, the bus bar case 2 as a support member that supports the bus bar 5, and the bus bar case 2 or the battery case 4. Cover member 7. The battery pack 1 includes a plurality of battery stacks 3 having a configuration in which a predetermined number of battery cells 30 are arranged in the cell stacking direction T1. Each battery stack 3 is connected to be energized by connecting all the battery cells 30 constituting the battery stack 3 in series. As shown in FIGS. 1 and 2, the battery stack 3 and the battery stack 3 are electrically connected in a state where they are installed side by side in the cell stacking direction T1. The battery case 4 and the battery case 4 adjacent to each other are connected together by engagement of the one battery case 4 and the other battery case by the engagement between the claw portion and the hole portion. The claw part and the hole part are provided in the battery case 4 or the bus bar case 2.

  At both ends of the plurality of battery stacks 3, connectors 11 are installed, each of which contains a total positive terminal and a total negative terminal as the battery pack 1. The battery cell 30 is, for example, a nickel metal hydride secondary battery, a lithium ion battery, or an organic radical battery. The battery cell 30 is housed in a housing, under a car seat, between a rear seat and a trunk room, a driver seat, and a passenger seat. It is arranged in the space between.

  The plurality of battery cells 30 constituting the battery pack 1 is also a single battery, and has an exterior case constituting an outer shell such as an aluminum can, for example, and protrudes upward from one end surface of the rectangular parallelepiped exterior case. And an electrode terminal 30b which is a negative electrode terminal. The battery pack 1 includes a predetermined number of bus bars 5 that connect the electrode terminals 30a and the electrode terminals 30b so that all the battery cells 30 are connected in series. The bus bar 5 is an example of a conductive member made of a conductive material. The bus bar 5 can be manufactured by pressing so as to have a shape having two flat plate portions 50, a vent portion that connects the two flat plate portions 50, a fin portion 51 that increases the heat transfer area, and the like. Hereinafter, the electrode terminal 30a and the electrode terminal 30b may be collectively referred to as an electrode terminal.

  A safety valve is provided on the outer case of each battery cell 30. Each safety valve is located between the electrode terminal 30a and the electrode terminal 30b, and is set to be broken when the internal pressure of the battery cell 30 becomes an abnormal pressure. The safety valve is configured, for example, by sticking and closing a thin metal film in a hole opened in the end face of the outer case of the battery cell 30. In this case, when the internal pressure of the battery cell 30 becomes an abnormal pressure, the metal film is broken and the hole of the outer case is opened, and the gas inside the battery cell 30 is exposed to the outside of the outer case. By being discharged, the cell internal pressure is reduced, and the battery itself can be prevented from bursting.

  The battery case 4 is a deep box-like member that can accommodate the entire battery cell 30 therein. The battery case 4 includes the same number of storage chambers that store the battery cells 30 as the battery cells 30 that store the battery cells 30. The plurality of storage chambers are provided so as to be arranged in the cell stacking direction T1. The accommodation chamber adjacent to the cell stacking direction T1 is partitioned by a partition wall. The battery case 4 holds the battery cells 30 by supporting the outer case of the battery cells 30 by partition walls provided at predetermined intervals. The battery case 4 is made of a synthetic resin such as polypropylene, polypropylene containing a filler or talc, for example. The battery case 4 is formed to have a bottom portion and four side plate portions surrounding four sides standing from the bottom portion. The side plate portion is provided with a plurality of attachment portions for fixing the battery pack 1 to the vehicle side with a fixture such as a bolt and nut at a predetermined position.

  The battery case 4 has an opening surrounded by four side plates at the upper end, which is one end. Each battery cell 30 is inserted into the battery case 4 from the opening at the upper end with the end face located opposite to the end face from which the electrode terminal 30a and the electrode terminal 30b protrude, and is inserted between the partition wall and the partition wall. It is installed at a predetermined position. The pair of side plate portions are located on both sides of the battery cell 30 in the cell width direction W1. The other pair of side plate portions are positioned at the cell stacking direction T1 of the plurality of battery cells 30 arranged in layers, that is, at both ends in the thickness direction.

  A bus bar case 2 that accommodates the bus bar at a predetermined position can be installed in the opening at the upper end of the battery case 4 so as to cover the opening. In this opening part, it arrange | positions so that the electrode terminal 30a and the electrode terminal 30b of the battery cell 30 installed in each storage chamber may be exposed. The bus bar case 2 is formed of an electrically insulating material, and insulates the bus bar 5 from the outer case of the battery cell 30. The bus bar case 2 is provided so as to cover, for example, the upper surface portion of the exterior case excluding the safety valve and each electrode terminal.

  The bus bar case 2 has a duct portion 25 that forms a smoke exhaust passage 250 for guiding the gas ejected from the safety valve to a predetermined location. The duct portion 25 has an upper surface of each battery cell 30 so that a portion where each battery cell 30 is provided with a safety valve communicates with an internal smoke exhaust passage 250 and the smoke exhaust passage 250 is blocked from the outside by a seal structure. Hold between. A seal member such as rubber may be disposed between the duct portion 25 and the upper surface of the battery cell 30. For example, a highly flexible resin such as an elastomer may be provided on the portion of the duct portion 25 that presses the upper surface of the battery cell 30 by two-color food molding or the like. The duct portion 25 extends along the cell stacking direction T1. The duct portion 25 has heat resistance, and even if the inside of the battery cell 30 is in an abnormally high pressure state and the gas inside is blown out due to the breakage of the safety valve, the portion forming the flue gas passage 250 is not melted and is damaged. Has no heat resistance. The bus bar case 2 is formed of an electrically insulating material, for example, a synthetic resin such as polypropylene or polypropylene containing filler or talc.

  The bus bar case 2 accommodates the bus bars 5 that electrically connect the battery cells 30 adjacent to each other in the cell stacking direction T1 on both sides of the duct portion 25 in the cell width direction W1. When the upper surface of the battery cell 30 is in contact with the bus bar case 2, the position of the electrode terminal with respect to the battery case 4 in the cell height direction H <b> 1 is defined.

  The bus bar 5 electrically connects electrode terminals that are different polar electrodes with respect to adjacent battery cells 30. The electrical connection between the bus bar 5 and the electrode terminal 30a or the electrode terminal 30b is provided by connection means such as ultrasonic welding, laser welding, or arc welding. The bus bar 5 and the battery cell 30 are electrically connected by joining the flat plate portion 50 and the electrode terminal 30a or the electrode terminal 30b.

  As shown in FIG. 1, for the battery stack 3, the electrode terminal 30 a that is the positive terminal of the battery cell 30 located at one end of the battery assembly in the battery case 4 is a bus bar having one flat plate portion 50. It is connected to the. The end portion of the bus bar is electrically connected to a total positive terminal incorporated in the connector 11 as a total terminal portion of the battery pack 1 as a whole, and is electrically connected to an external power supply section.

  The electrode terminal 30 b of the battery cell 30 located at one end is connected to the electrode terminal 30 a of the adjacent battery cell 30 by the bus bar 5. Further, the battery cells 30 stacked in the cell stacking direction T1 are connected in series by the bus bar 5 in order. An electrode terminal 30 b that is a negative electrode terminal of the battery cell 30 located at the other end of the battery stack 3 is connected to a bus bar having one flat plate portion 50. The end of this bus bar is electrically connected to the adjacent battery stack 3. In the battery stack 3 positioned at the other end, the electrode terminal 30 b that is the negative terminal of the battery cell 30 positioned at the other end of the battery stack 3 is connected to a bus bar having one flat plate portion 50. The end of the bus bar is electrically connected to a total negative electrode terminal built in the connector 11 as a total terminal portion of the entire battery pack 1, and is electrically connected to an external power supply unit. Thus, the bus bar and the bus bar arranged at both ends as the total terminal portion of the entire battery pack 1 are connected to a current control circuit using, for example, a relay in order to supply and discharge power.

  When the step of connecting the electrode terminal 30a and the electrode terminal 30b by the bus bar 5 is performed, first, each battery cell 30 is in a posture with the end surface opposite to the end surface on which the electrode terminal is provided as the head. The battery case 4 is properly accommodated and held in each accommodation chamber from the upper end opening. Next, the bus bar case 2 is assembled to an assembly in which the battery case 4 and the plurality of battery cells 30 are integrated, and the hole passing through the assembly part 42 of the battery case 4 and the assembly part 22 of the bus bar case 2 are penetrated. The bolt 10 is inserted through the hole and tightened with a nut. For the assembled product of the battery case 4 and the bus bar case 2, the bus bar 5 corresponding to the electrode terminal exposed from the opening formed in the base portion 20 of the bus bar case 2 is installed at a predetermined position. Thereby, the bus bar 5 is supported by the bus bar case 2 in a state in which the flat plate portion 50 and the electrode terminal are in contact with each other. In this state, for each bus bar 5, the above-described welding is performed on the contact portion where the flat plate portion 50 and the electrode terminal are in contact, and the bus bar 5 and the electrode terminal are electrically joined.

  The battery pack 1 includes a predetermined number of voltage detection lines 6 wired to transmit a voltage signal between the predetermined battery cells 30 and the predetermined battery cells 30 or in each battery cell 30. The voltage detection line 6 is an example of a detection member connected to the bus bar 5 in order to detect an electrical signal related to battery information. The voltage detection line 6 is an electric signal detection line for detecting various battery information related to the battery pack 1, and connects a predetermined part of the bus bar 5 to a control device such as a battery monitoring unit. The detection member such as the voltage detection line 6 may be incorporated in the bus bar case 2 from one end connected to the bus bar 5 to the other end connected to the connector terminal. For example, the detection member may be configured to be wired along the outer surface of the bus bar case 2.

  The voltage detection line 6 extends from a connection portion with the bus bar 5 to which one end is connected, and the other end is connected to a connector terminal built in the battery side connector 13. The voltage detection line 6 is a communication line extending from the connection portion with the bus bar 5 to the connector terminal of the battery side connector 13. The other end of the voltage detection line 6 and the output connector terminal are coupled by, for example, caulking or welding described above. The battery-side connector 13 is connected to a control-device-side connector that incorporates an input connector terminal that is one end of an input signal line connected to the control device. The voltage detection line 6 detects a predetermined potential difference as an electrical signal in the battery stack 3 and is output to a control device constituting a battery management unit or the like by connecting the output connector terminal to the input connector terminal in a conductive manner. To do.

  The battery management unit is a device that manages at least the amount of power stored in the battery stack 3, and is an example of a battery control unit that performs control related to the battery pack 1. Further, the battery management unit may be a device that monitors current, voltage, and temperature related to the battery stack 3 and manages abnormality of the battery stack 3, leakage abnormality, and the like. The battery management unit is configured to be able to communicate with various electronic control devices mounted on the vehicle. The battery management unit may receive a signal related to the current value detected by the current sensor, or may be a control device that controls the operation of the main relay or the precharge relay. The battery management unit can function as a device that controls the operation of the motor of the blower for cooling the heating element such as the battery stack 3.

  For example, the battery cell 30 self-heats at the time of output when discharging and taking out current and at the time of input when charging. The battery management unit constantly monitors the temperature of the battery cell 30 and controls the operation of the blower based on the temperature of the battery cell 30. For example, the battery management unit applies a voltage controlled to a duty ratio of an arbitrary value included in 0% to 100% to the maximum voltage of the motor of the blower 8 to vary the rotation speed of each fan. be able to. In the battery pack 1, the air volume by the blower 8 can be adjusted in multiple steps or steplessly by changing the rotational speed of the fan by this duty control.

  The voltage detection line 6 is drawn from a connection portion with the bus bar 5 and is wired so as to extend in the cell width direction W1 between the bus bars 5 adjacent to each other in the cell stacking direction T1. The base portion 20 of the bus bar case 2 includes a bus bar inter-wall portion extending in the cell width direction W1 at a location corresponding to the space between the bus bars 5 adjacent to each other in the cell stacking direction T1. According to this configuration, the inter-bus bar wall portion can provide a function of insulating the adjacent bus bars 5 from each other.

  The wall portion between the bus bars may be configured to accommodate the voltage detection line 6 extending from the adjacent bus bar 5 and guide it toward the battery side connector 13. As shown in FIGS. 1, 3, and 4, the duct portion 25 has a flue gas passage 250 located in the center portion in the bus bar case 2 with respect to the cell width direction W <b> 1 and extending over the entire length in the cell stacking direction T <b> 1. ing. The flue gas passage 250 intersects the fluid passage 70 at the center of the fluid passage 70. A plurality of inter-bus bar walls are provided at predetermined intervals on both sides of the duct portion 25 with respect to the cell width direction W1. A bus bar 5 is accommodated in the space of the predetermined interval.

  The battery pack 1 includes a fluid passage 70 through which a cooling fluid for cooling the battery cells 30 flows. The cover member 7 is installed so as to form a fluid passage 70 through which a cooling fluid to be brought into contact with the bus bar 5 flows. The cover member 7 is made of a material having electrical insulation properties, for example, a synthetic resin such as polypropylene, polypropylene containing a filler or talc. The fluid passage 70 is a passage formed so that the cooling fluid flows on the surface of the bus bar 5. The fluid passage 70 has an opening formed through the frame wall portion of the bus bar case 2 as a passage inlet portion 12. The battery pack 1 includes a fluid passage 170 through which a cooling fluid for cooling the battery cells 30 flows. The fluid passage 170 is a passage formed so that the cooling fluid flows on the surface of the exterior case in the battery cell 30. The fluid passage 170 has an opening formed through the side wall portion of the battery case 4 as a passage inlet portion 14.

  The blower 8 is an example of a fluid drive device that forms a forced cooling fluid flow in the fluid passage 70 and the fluid passage 170. The suction portion 80 of the blower 8 is connected to the passage outlet portion of the fluid passage 70 and the passage outlet portion of the fluid passage 170 by the connecting duct 15. For example, air, various gases, water, or a refrigerant can be used as the cooling fluid.

  The cooling fluid flows into the fluid passage 70 from the passage inlet portion 12 by the suction force of the blower 8 and flows along the surface of the bus bar 5 arranged on the side close to the passage inlet portion 12. Then, after getting over the duct portion 25, it flows along the surface of the bus bar 5 arranged on the side far from the passage entrance portion 12 and flows out of the battery pack 1. In addition, the cooling fluid flows into the fluid passage 170 from the passage inlet 14 by the suction force of the blower 8, flows along the surface of the outer case of the battery cell 30, and flows out of the battery pack 1. The cooling fluid that has flowed out of the battery pack 1 is sucked into the blower 8 from the suction portion 80 via the passage in the connecting duct 15 and flows out from the blow-out portion 81 to the outside. Thus, by forcibly flowing the cooling fluid so as to contact the surface of the bus bar 5 or the surface of the outer case of the battery cell 30, the performance of cooling the battery cell 30 can be enhanced.

  The battery pack 1 includes a protruding portion 71 that protrudes from the cover member 7 toward the bus bar 5 and has a distal end spaced from the bus bar 5. The protrusion 71 may be a part of the cover member 7 made of the same material as the cover member 7 or may be a separate part assembled to the cover member 7. As shown in FIGS. 3 and 4, since the protruding portion 71 exists in the fluid passage 70, the passage cross-sectional area of the portion where the protruding portion 71 exists is smaller than the portion where the protruding portion 71 does not exist. Therefore, the protruding portion 71 functions as an obstacle wall for the fluid flowing through the fluid passage 70, and the fluid traveling in the direction of colliding with the protruding portion 71 flows around the protruding portion 71 avoiding the protruding portion 71.

  As shown in FIG. 2, the cover member 7 has a shape that covers the entire surface of the battery stack 3 on which the bus bar 5 is installed. As shown in FIG. 4, the cover member 7 includes an upstream roof portion 7 a that faces the bus bar 5 near the passage inlet portion 12, and a downstream roof portion that faces the bus bar 5 far from the passage inlet portion 12. 7c and an intermediate roof portion 7b connecting the upstream roof portion 7a and the downstream roof portion 7c.

  The upstream roof portion 7 a is a flat plate-like portion that forms a flat rectangular parallelepiped passage corresponding to the upstream side of the fluid passage 70 between the battery stack 3 and the bus bar installation surface. The downstream roof portion 7 c is a flat plate-like portion that forms a flat rectangular parallelepiped passage corresponding to the downstream side of the fluid passage 70 between the battery stack 3 and the bus bar installation surface. The intermediate roof portion 7b has a semi-cylindrical shape extending in the cell stacking direction T1, and is integrally connected to each of the upstream roof portion 7a and the downstream roof portion 7c at the end of the side surface of the semi-cylindrical shape. The intermediate roof portion 7b covers the outer surface of the duct portion 25 so that a part of the fluid passage 70 is a half donut-shaped cross section and extends to the entire cell stacking direction length of the battery stack 3 between the intermediate roof portion 7b. Yes. That is, the fluid passage 70 extends along the bus bar installation surface inside the upstream roof portion 7a and then rises away from the battery stack 3 inside the intermediate roof portion 7b so as to approach the battery stack 3. And it extends along the bus bar installation surface inside the downstream roof portion 7c.

  As shown in FIG. 4, the protruding portion 71 protrudes from the inner surface of the downstream roof portion 7 c toward the bus bar 5. The protruding portion 71 is provided only on the downstream side in the fluid passage 70 and is not provided on the upstream side. Furthermore, the protrusion 71 is provided so as to face the bus bar 5 positioned downstream of the smoke exhaust passage 250 intersecting at the center of the fluid passage 70 in the entire fluid flow direction.

  The protruding portion 71 is provided so that at least a part thereof exists in a space S <b> 1 formed by connecting the projection of the bus bar 5 projected onto the cover member 7 and the outer shape of the bus bar 5. The projection diagram is a figure formed on the projection surface of the cover member 7 when the bus bar 5 is projected onto the projection surface of the cover member 7 in a direction perpendicular to the bus bar 5. The figure that can be formed on the projection plane is such that a projection line that is a straight line and a projection of the cover member 7 are obtained by connecting a viewpoint in which the bus bar 5 is viewed in a direction perpendicular to the bus bar 5 and an arbitrary point on the bus bar 5 by a straight line. It is a planar projection figure formed on a projection surface by connecting the intersection with a surface. The direction perpendicular to the bus bar 5 can be defined as a direction perpendicular to the surface of the bus bar having a contact portion between the bus bar 5 and the electrode terminal.

  As shown in FIG. 5, the protrusion 71 is configured such that the cell stacking direction length is larger than that of the bus bar 5. The protruding portion 71 is provided at a position covering the entire bus bar 5 in the cell stacking direction T1. The protruding portion 71 exists in the entire length in the cell stacking direction of the space S1 and further has a length that protrudes from the space S1 in the cell stacking direction T1. The projecting portion 71 is provided so as to maintain the positional relationship with the bus bar 5 as described above and to extend over the entire length of the bus bar 5 in the fluid flow direction as shown in FIG. With this configuration, the cooling fluid that changes the flow direction to the bus bar 5 side by the protrusion 71 can be made to flow so as to approach the entire length of the bus bar 5 in the cell stacking direction.

  The positional relationship in the cell stacking direction T1 between the protrusion 71 and the bus bar 5 may be as shown in FIG. As shown in FIG. 6, the protruding portion 171 protruding from the cover member 7 toward the bus bar 5 is provided at a position covering a part of the bus bar 5 in the cell stacking direction T1. The protruding portion 171 exists in a part of the length in the cell stacking direction S1 in the space, and has a shorter length than the space S1 in the cell stacking direction T1. The entire protrusion 171 is provided so as to be included in the space S1. The protruding portion 171 is provided so as to cover the entire length of the bus bar 5 in the fluid flow direction as shown in FIG. 4 while maintaining such a positional relationship with the bus bar 5. With this configuration, of the cooling fluid, the fluid whose direction of flow is changed to the bus bar 5 side by the protrusions 171 flows so as to approach a part of the length of the bus bar 5 in the cell stacking direction. The fluid whose direction is changed to T1 promotes turbulent flow in the fluid passage 70.

  The positional relationship in the fluid flow direction between the protrusion 71 and the bus bar 5 may be as shown in each of FIGS. As shown in FIG. 7, the protruding portion 271 that protrudes from the cover member 7 toward the bus bar 5 is provided so as to cover a part of the bus bar 5 in the fluid flow direction. The protruding portion 271 exists in a part of the length of the fluid flow direction in the space S1, and has a length shorter than that of the space S1 in the fluid flow direction. The entire protrusion 271 is provided so as to be included in the space S1. The position where the protruding portion 271 covers a part of the bus bar 5 in the fluid flow direction is any one of the upstream side, the downstream side, and the intermediate portion of the bus bar 5. Preferably there is. This is because, among the cooling fluids, the fluid that changes the flow direction to the bus bar 5 side by the protrusions 271 can be brought into contact with the part efficiently.

  As shown in FIG. 8, the protruding portion 371 that protrudes from the cover member 7 toward the bus bar 5 is provided so as to cover a part of the bus bar 5 in the fluid flow direction. The protruding portion 371 exists in a part of the length of the fluid flow direction in the space S1, and has a length shorter than the space S1 in the fluid flow direction. A part of the protruding portion 371 is included in the space S1, and further has a length that protrudes from the space S1 in the cell stacking direction T1. The position where the protruding portion 371 covers a part of the bus bar 5 in the fluid flow direction is preferably the part where the temperature is highest in the bus bar 5 or the upstream side of the part. This is because, among the cooling fluid, the fluid that changes the flow direction to the bus bar 5 side can be efficiently brought into contact with the portion by the protrusion 371.

  As shown in FIG. 9, the protruding portion 471 that protrudes from the cover member 7 toward the bus bar 5 is provided at a position that covers the entire bus bar 5 in the fluid flow direction. The protruding portion 471 exists over the entire length of the fluid flow direction in the space S1, and further has a length that protrudes from the space S1 in the fluid flow direction. With this configuration, the cooling fluid whose direction of flow is changed to the bus bar 5 side by the protruding portion 471 can be flowed so as to approach the entire length of the bus bar 5 in the fluid flow direction.

  Next, effects obtained by the battery pack 1 of the first embodiment will be described. The battery pack 1 includes a bus bar 5 that connects adjacent electrode terminals 30a and 30b in adjacent battery cells 30, a battery stack 3 that is an assembly of a plurality of battery cells 30 connected by the bus bar 5, and a bus bar. And a bus bar case 2 that supports 5. The battery pack 1 further includes a cover member 7 installed so as to form a fluid passage 70 through which a cooling fluid to be brought into contact with the bus bar 5 flows, and the cover member 7 toward the bus bar 5. And a protruding portion 71 protruding from the bus bar 5. At least a part of the projecting portion 71 exists in a space S <b> 1 formed by connecting the projection of the bus bar 5 projected onto the cover member 7 and the outer shape of the bus bar 5.

  According to the battery pack 1, a space formed by connecting at least a part of the projecting portion 71 projecting from the cover member 7 toward the bus bar 5 by connecting the projection of the bus bar 5 projected onto the cover member 7 and the outer shape of the bus bar 5. It exists in S1. In other words, the protrusion 71 is provided so that at least a part thereof faces the bus bar 5. Since the protrusion 71 exists on the cover member 7 side that is separated from the bus bar 5 in the space S1, the protrusion 71 does not exist near the surface of the bus bar 5. For this reason, the flow resistance of the fluid flowing in the vicinity of the cover member 7 is larger than the flow resistance of the fluid flowing in the vicinity of the bus bar 5. As a result, in the portion of the fluid passage 70 where the bus bar 5 exists, the cooling fluid easily flows toward the bus bar 5, and a flow in which the cooling fluid can easily come into contact with the bus bar 5 can be formed. Therefore, the battery pack 1 can improve the cooling performance of the bus bar 5 by forming a cooling fluid flow that directly cools the bus bar 5 that connects the electrode terminals.

  The battery pack 1 has a protruding portion in which the volume of the portion existing in the space S1 is larger in the fluid passage 70 on the downstream side than on the upstream side. According to this configuration, the flow passage cross-sectional area of the portion where the bus bar 5 exists in the fluid passage 70 becomes smaller on the downstream side than on the upstream side. Thereby, since the flow rate can be made larger on the downstream side than on the upstream side, the heat exchange performance between the bus bar 5 and the cooling fluid can be improved on the downstream side. Moreover, since the fluid flow approaching the bus bar 5 can be promoted on the downstream side rather than the upstream side, the heat radiation of the bus bar 5 can be enhanced on the downstream side. As described above, by improving the heat exchange performance on the downstream side, it is possible to improve the battery cooling performance of the battery pack in which the cooling performance tends to be lower on the downstream side than on the upstream side.

  The protrusion 71 is provided only on the downstream side in the fluid passage 70. According to this configuration, since the heat exchange performance between the bus bar 5 and the cooling fluid and the fluid flow approaching the bus bar 5 can be realized on the downstream side with respect to the upstream side, the battery cooling on the downstream side, which tends to be lowered, can be realized. The performance can be improved.

  The protruding portion 71 is provided so as to cover the entire cell stacking direction T <b> 1 with respect to the bus bar 5. According to this configuration, since a fluid flow that approaches the bus bar 5 can be formed over the entire length of the bus bar 5 in the cell stacking direction, heat dissipation from the bus bar 5 can be promoted over the entire length in the cell stacking direction. Therefore, the battery pack 1 that improves the cooling performance of the bus bar 5 can be provided.

  The protrusion 71 is provided so as to cover the entire flow direction of the cooling fluid with respect to the bus bar 5. According to this configuration, a fluid flow that approaches the bus bar 5 can be formed over the entire length of the bus bar 5 in the fluid flow direction, and thus heat dissipation from the bus bar 5 can be promoted over the entire length in the fluid flow direction. Therefore, the battery pack 1 that improves the cooling performance of the bus bar 5 can be provided.

(Second Embodiment)
In 2nd Embodiment, the protrusion part 571 which exists in the fluid channel | path 70 which is another form of the battery pack 1 of 1st Embodiment is demonstrated with reference to FIG. In FIG. 10, the component which attached | subjected the same code | symbol as drawing of 1st Embodiment is a similar component, and there exists the same effect. Hereinafter, content different from the first embodiment will be described.

  The second embodiment is different from the first embodiment in that a protrusion 571 that exists on the upstream side of the fluid passage 70 is provided. In addition to the projecting portion 71, the battery pack 1 includes a projecting portion 571 projecting from the cover member 107 toward the bus bar 5 and having a tip separated from the bus bar 5. The protrusion 571 may be a part of the cover member 107 made of the same material as the cover member 107 or may be a separate part assembled to the cover member 107. As shown in FIG. 10, since the protrusion 571 exists on the upstream side of the fluid passage 70, the passage cross-sectional area of the portion where the protrusion 571 exists is smaller than the portion where the protrusion 571 does not exist. Accordingly, the protruding portion 571 functions as an obstacle wall for the fluid flowing through the fluid passage 70 in the same manner as the protruding portion 71, and the fluid traveling in the direction of colliding with the protruding portion 571 flows around the protruding portion 571 while avoiding the protruding portion 571. It becomes like this.

  As illustrated in FIG. 10, the protruding portion 571 protrudes from the inner surface of the upstream roof portion 7 a toward the bus bar 5. The protruding portion 571 is provided so as to face the bus bar 5 positioned upstream of the flue gas passage 250 intersecting at the center of the fluid passage 70 in the entire fluid flow direction. Similar to the projecting portion 71, the projecting portion 571 is provided so that at least a part thereof exists in the space S <b> 1 formed by connecting the projection of the bus bar 5 projected onto the cover member 107 and the outer shape of the bus bar 5. The projection diagram is a figure formed on the projection surface of the cover member 107 when the bus bar 5 is projected onto the projection surface of the cover member 107 in a direction perpendicular to the bus bar 5. This space S1 is the same as the space S1 in the first embodiment.

  According to the second embodiment, the battery pack 1 includes the protruding portion 71 and the protruding portion 571 in which the volume of the portion existing in the space S1 is equal on the upstream side and the downstream side in the fluid passage 70. According to the battery pack 1, the fluid passage 70 can be configured such that the upstream-side channel cross-sectional area is equal to the downstream-side channel cross-sectional area. Thereby, a fluid flow can be formed such that the flow velocity does not change significantly between the upstream side and the downstream side. Accordingly, a fluid flow approaching the bus bar 5 can be formed by each protrusion to improve the cooling performance, and there is a large difference between the heat exchange performance with the bus bar 5 on the upstream side and the heat exchange performance with the bus bar 5 on the downstream side. Battery pack 1 can be provided.

  According to 2nd Embodiment, the battery pack 1 is provided with the protrusion part in the position which opposes all the bus bars 5 located in a line with a fluid flow direction. According to this battery pack 1, the cooling fluid easily flows to the side of all the bus bars 5 aligned in the fluid flow direction in the fluid passage 70, and the flow that makes the cooling fluid easy to contact all the bus bars 5 aligned in the fluid flow direction. Can be formed. Therefore, the battery pack 1 can improve the cooling performance of the bus bar 5 by forming a cooling fluid flow that directly cools all the bus bars 5 arranged in the fluid flow direction.

(Third embodiment)
In 3rd Embodiment, the protrusion part 671 and the protrusion part 771 which are the other forms of the battery pack 1 of 1st Embodiment and which exist in the fluid channel | path 70 are demonstrated with reference to FIG. In FIG. 11, components given the same reference numerals as those in the drawing of the first embodiment are the same components and have the same effects. Hereinafter, content different from the first embodiment will be described.

  3rd Embodiment differs in the structure of the protrusion part which exists in the fluid channel | path 70 with respect to 1st Embodiment. The battery pack 1 of the third embodiment includes a protrusion 671 that protrudes upstream of the fluid passage 70 and a protrusion 771 that protrudes downstream of the fluid passage 70. The protruding portion 671 has a columnar shape protruding from the upstream roof portion 7 a of the cover member 207 toward the bus bar 5, and the tip is separated from the bus bar 5. The projecting portion 771 has a columnar shape projecting from the downstream roof portion 7 c of the cover member 207 toward the bus bar 5, and the tip is separated from the bus bar 5. The protruding portion 671 and the protruding portion 771 may be a part of the cover member 207 made of the same material as the cover member 207, or may be a separate part assembled to the cover member 207.

  As shown in FIG. 11, since the protruding portion 671 exists on the upstream side of the fluid passage 70, the passage cross-sectional area of the portion where the protruding portion 671 exists is smaller than the portion where the protruding portion 671 does not exist. Accordingly, the protruding portion 671 functions as an obstacle wall for the fluid flowing through the fluid passage 70, and the fluid traveling in the direction of colliding with the protruding portion 671 avoids the protruding portion 671 and flows around the protruding portion 671. Further, since the protruding portion 671 is columnar, a turbulent flow can be locally generated on the upstream side of the fluid passage 70 by forming a fluid flow around the protruding portion 671.

  As shown in FIG. 11, the protruding portion 671 is provided so as to be entirely present in a space S <b> 1 formed by connecting the projection of the bus bar 5 projected onto the cover member 207 and the outer shape of the bus bar 5. The projection diagram is a figure that can be formed on the projection surface of the cover member 207 when the bus bar 5 is projected onto the projection surface of the cover member 207 in a direction perpendicular to the bus bar 5. This space S1 is the same as the space S1 in the first embodiment.

  As shown in FIG. 11, since the protruding portion 771 exists on the downstream side of the fluid passage 70, the cross-sectional area of the portion where the protruding portion 771 exists is smaller than the portion where the protruding portion 771 does not exist. Therefore, the protruding portion 771 functions as an obstacle wall for the fluid flowing through the fluid passage 70, and the fluid traveling in the direction of colliding with the protruding portion 771 flows around the protruding portion 771 while avoiding the protruding portion 771. The protruding portion 771 is provided so as to be entirely present in a space S1 formed by connecting the projection of the bus bar 5 projected onto the cover member 207 and the outer shape of the bus bar 5. Furthermore, since the protruding portion 771 is columnar, a fluid flow around the protruding portion 771 is formed, so that a turbulent flow can be locally generated on the downstream side of the fluid passage 70.

  According to the third embodiment, the battery pack 1 includes the protruding portion 671 and the protruding portion 771 in which the volume of the portion existing in the space S1 is equal on the upstream side and the downstream side in the fluid passage 70. According to this battery pack 1, in the fluid passage 70, the upstream flow passage cross-sectional area can be configured to be equal to the downstream flow passage cross-sectional area, so that the flow velocity varies greatly between the upstream side and the downstream side. A fluid flow that does not occur can be formed. Therefore, it is possible to provide the battery pack 1 in which there is no significant difference between the heat exchange performance with the bus bar 5 on the upstream side and the heat exchange performance with the bus bar 5 on the downstream side.

(Fourth embodiment)
In 4th Embodiment, the protrusion part 871 and the protrusion part 71 which are the other forms of the battery pack 1 of 1st Embodiment and which exist in the fluid channel | path 70 are demonstrated with reference to FIG. In FIG. 12, the constituent elements having the same reference numerals as those in the drawing of the first embodiment are the same constituent elements and have the same operational effects. Hereinafter, content different from the first embodiment will be described.

  The fourth embodiment is different from the first embodiment in that a protrusion 871 that exists on the upstream side of the fluid passage 70 is provided. In addition to the projecting portion 71, the battery pack 1 includes a projecting portion 871 that projects from the cover member 307 toward the bus bar 5 and has a tip spaced from the bus bar 5. The protrusion 871 is configured to have a smaller volume than the protrusion 71. The protrusion 871 may be a part of the cover member 307 made of the same material as the cover member 307, or may be a separate part assembled to the cover member 307. As shown in FIG. 12, since the protruding portion 871 exists on the upstream side of the fluid passage 70, the cross-sectional area of the portion where the protruding portion 871 exists is smaller than the portion where the protruding portion 871 does not exist. Accordingly, the protruding portion 871 functions as an obstacle wall for the fluid flowing through the fluid passage 70 in the same manner as the protruding portion 71, and the fluid traveling in the direction of colliding with the protruding portion 871 avoids the protruding portion 871 and flows around the protruding portion 871. It becomes like this.

  As shown in FIG. 12, the protruding portion 871 protrudes from the inner surface of the upstream roof portion 7 a toward the bus bar 5. The protruding portion 871 is provided so as to face the bus bar 5 positioned on the upstream side of the smoke exhaust passage 250 intersecting at the central portion of the fluid passage 70. Similar to the projecting portion 71, the projecting portion 871 is provided so that at least a part thereof exists in the space S <b> 1 formed by connecting the projection of the bus bar 5 projected onto the cover member 307 and the outer shape of the bus bar 5. The projection diagram is a figure that can be formed on the projection surface of the cover member 307 when the bus bar 5 is projected onto the projection surface of the cover member 307 in a direction perpendicular to the bus bar 5.

  According to the fourth embodiment, the battery pack 1 has the protruding portion in which the volume of the portion existing in the space S <b> 1 is larger on the downstream side than on the upstream side in the fluid passage 70. According to this configuration, since the downstream protrusion 71 has a larger volume than the upstream protrusion 871, the flow passage cross-sectional area of the fluid passage 70 where the bus bar 5 is present is more downstream than the upstream. Get smaller. As a result, the downstream side can increase the flow velocity over a wider range than the upstream side, so that the heat exchange performance between the bus bar 5 and the cooling fluid can be improved on the downstream side. Further, since the fluid flow approaching the bus bar 5 can be promoted in a wider range on the downstream side than the upstream side, the heat radiation of the bus bar 5 can be enhanced on the downstream side. Thus, according to the fourth embodiment, by improving the heat exchange performance on the downstream side, it is possible to improve the battery cooling performance of the battery pack whose cooling performance tends to be lower on the downstream side than on the upstream side.

(Fifth embodiment)
In 5th Embodiment, the protrusion part 407a which exists in the fluid channel | path 70 which is another form of the battery pack 1 of 1st Embodiment is demonstrated with reference to FIG. In FIG. 13, components given the same reference numerals as those in the drawing of the first embodiment are the same components and have the same operational effects. Hereinafter, content different from the first embodiment will be described.

  The battery pack 201 of the fifth embodiment is different from the first embodiment in the configuration of the protruding portion 407a, the fluid passage 70, and the smoke exhaust passage 1250. The cover member 407 is installed so as to form a fluid passage 70 through which a cooling fluid to be brought into contact with the bus bar 5 flows. The cover member 407 is made of an electrically insulating material, for example, a synthetic resin such as polypropylene, polypropylene containing filler or talc.

  The fluid passage 70 includes an upstream passage between the upstream roof portion 7a and the upstream bus bar 5, a downstream passage between the downstream roof portion 7c and the downstream bus bar 5, an upstream passage, and a downstream passage. An intermediate communication passage that communicates with the side passage is configured. As shown in FIG. 13, the intermediate communication passage is a passage that is provided around the communication duct portion 210 and transitions from the upstream passage to the downstream passage, and the communication duct from the upstream passage to the downstream passage. It is provided so as to go around the outside of the portion 210. The fluid passage 70 extends along the bus bar installation surface on the inner side of the upstream roof portion 7a, then proceeds to wrap around the communication duct portion 210, and further on the bus bar installation surface on the inner side of the downstream roof portion 7c. It is the channel | path extended along.

  The communication duct portion 210 forms a passage that allows the smoke exhaust passage 1250 and the portion of the battery cell 30 provided with the safety valve to communicate with each other. Therefore, the gas ejected from the safety valve flows out to the smoke exhaust passage 1250 through the passage in the communication duct portion 210 and is discharged to the outside from the duct portion 407b.

  The cover member 407 includes an upstream roof portion 7a, a downstream roof portion 7c, and a duct portion 407b that connects the upstream roof portion 7a and the downstream roof portion 7c. The duct portion 407b has a semi-cylindrical shape extending in the cell stacking direction T1, and is integrally connected to each of the upstream roof portion 7a and the downstream roof portion 7c at the end portion of the semi-cylindrical side wall. Duct portion 407b forms smoke exhaust passage 1250 therein. The smoke exhaust passage 1250 communicates with a portion where the safety valve of the battery cell 30 is provided, and intersects the fluid passage 70. The smoke exhaust passage 1250 is provided such that a part of the fluid passage 70 is interposed between the battery cells 30.

  The battery pack 201 includes a protruding portion 407 a that protrudes from the cover member 407 toward the battery cell 30 and that has a tip spaced from the battery cell 30. The protruding portion 407a protrudes on each of the upstream side, which is a part of the fluid passage 70, which is a part that transitions from the upstream side passage to the intermediate connection path, and the downstream side, which is a part that is the part that transitions from the intermediate connection path to the downstream side passage. Is provided. Therefore, the flow of the cooling fluid is directed toward the battery cell 30 by the upstream protrusion 407a when moving from the upstream passage to the intermediate communication passage, so that the cooling fluid approaches the battery cell 30 and passes through the intermediate communication passage. It comes to circulate. As a result, the cooling fluid flows out from the intermediate connecting passage in a state of approaching the battery cell 30, and therefore flows into the downstream passage at a position close to the downstream bus bar 5. Further, since the cooling fluid is prevented from flowing toward the downstream roof portion 7c when it is transferred from the intermediate communication passage to the downstream passage, it is further suppressed by the downstream protrusion 407a. It flows along 5.

  According to this battery pack 201, since the protruding portion 407a that protrudes from the duct portion 407b toward the battery cell 30 into the fluid passage 70 is provided, the cooling fluid can be made to flow closer to the bus bar 5 on the downstream side. Therefore, the battery pack 201 can improve the cooling performance of the bus bar 5 by forming a cooling fluid flow that directly cools the bus bar 5.

  Furthermore, the protruding portion 407 a protrudes from the cover member 407 toward the battery cell 30 and has a tip at the battery cell 30 on both the upstream side and the downstream side with respect to the portion where the fluid passage 70 and the smoke exhaust passage 1250 intersect. It is away from. According to this, the protrusion 407a located on the upstream side of the intersecting portion directs the flow direction of the cooling fluid toward the battery cell 30 when the fluid passage 70 transitions from the upstream side passage to the intermediate communication passage. Thus, the cooling fluid can be brought closer to the downstream bus bar 5. Further, the protruding portion 407a located on the downstream side of the intersecting portion suppresses the flow of the cooling fluid toward the downstream roof portion 7c when shifting from the intermediate connecting passage to the downstream passage, thereby further reducing the bus bar on the downstream side. 5 can be formed. Therefore, the battery pack 201 can improve the cooling performance of the bus bar 5 by forming a cooling fluid flow for directly cooling the bus bar 5 by the protrusions 407a provided on the upstream side and the downstream side. .

(Other embodiments)
The disclosure of this specification is not limited to the illustrated embodiments. The disclosure encompasses the illustrated embodiments and variations by those skilled in the art based thereon. For example, the disclosure is not limited to the combination of components and elements shown in the embodiments, and various modifications can be made. 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 embodiment are omitted. The disclosure encompasses parts, element replacements, or combinations between one embodiment and another. The technical scope disclosed is not limited to the description of the embodiments. The technical scope disclosed is indicated by the description of the scope of claims, and should be understood to include all modifications within the meaning and scope equivalent to the description of the scope of claims.

  In the above-described embodiment, the battery pack 1 is installed such that the cell height direction H1 is directed in the vertical direction, but the installation example of the battery pack 1 is not limited to such a posture. For example, the battery pack 1 has a posture in which the cover member is positioned below the battery cell 30, a posture in which the cover member and the battery cell 30 are aligned in the horizontal direction, and the cell height direction H1 in the drawing is the vertical direction. It may be installed in such a posture as to be inclined with respect to.

  The protrusions disclosed in each of the second to fifth embodiments described above may satisfy the positional relationship with the bus bar 5 in the cell stacking direction T1 as illustrated in FIGS. Good.

  The protruding portion in each of the above-described embodiments is preferably provided at a position facing the portion where the bus bar 5 and the battery cell 30 are in contact, for example, the flat plate portion 50. In other words, at least a part of the projecting portion exists in a predetermined space formed by connecting a projection in which a portion where the bus bar 5 and the battery cell 30 are in contact with each other is projected onto the cover member and an outer shape of the contact portion. It is preferable that it is provided. This is because a flow that allows the cooling fluid to approach the site where heat dissipation from the battery cell is easily transmitted in the bus bar 5 can be formed.

  The right range that the protruding portion is provided such that the volume of the portion existing in the space S1 is larger on the downstream side than the upstream side in the fluid passage 70 is not limited to the form disclosed in the above-described embodiment. . For example, even if the protruding portion has only one configuration in the fluid flow direction in the fluid passage 70, the right range is that the volume of the portion existing in the space S1 is more downstream than the upstream side in the fluid passage 70. The form provided so that it may become large shall also be included.

  In the above-described embodiment, the battery cell constituting the battery assembly may have, for example, a thin flat plate shape of the outer case, and the outer case may be formed of a laminate sheet. The laminate sheet is made of a highly insulating material. The battery cell has, for example, an internal space of a flat container that is sealed by sealing the ends of the laminate sheet that is folded in half by heat-sealing the ends. The internal space contains a battery main body portion including an electrode assembly, an electrolyte, a terminal connection portion, a part of the positive electrode terminal portion, and a part of the negative electrode terminal portion. Therefore, the battery main body part is accommodated in the inside of a flat container in the sealing state by sealing the peripheral part of a flat container in the some battery cell. Each battery cell has a pair of electrode terminals drawn outward from the flat container.

  In the above-described embodiment, the battery stack 3 included in the battery pack 1 is two battery assemblies, but may be, for example, one battery assembly. Further, the battery stack 3 included in the battery pack 1 may be three or more battery assemblies arranged in the fluid flow down direction or in the direction intersecting with the fluid flow down direction.

  In the above-described embodiment, the plurality of battery cells 30 constituting the battery stack 3 may be installed in the housing space of the battery case 4 in a state of being contacted without providing a gap between adjacent battery cells. The battery cells may be installed with a predetermined gap.

2 ... bus bar case (support member), 3 ... battery stack,
5 ... Bus bar (conductive member) 6 ... Voltage detection line (detection member),
7, 107, 207, 307, 407 ... Cover member 30 ... Battery cell, 30a, 30b ... Electrode terminal, 70 ... Fluid passage 71, 171, 271, 371, 471, 571, 671, 771, 871 ... Projection 407a ... Projection, 407b ... Duct, 1250 ... Smoke passage S1 ... In space, T1 ... Cell stacking direction

Claims (8)

A conductive member (5) for connecting the electrode terminal (30a) and the electrode terminal (30b) adjacent to each other in the battery cell (30) adjacent in the cell stacking direction (T1);
A battery stack (3) that is an assembly of a plurality of the battery cells connected by the conductive member;
A support member (2) formed of a material having electrical insulation and supporting the conductive member;
A cover member (7; 107; 207; 307) installed so as to form a fluid passage (70) through which the cooling fluid to be brought into contact with the conductive member is formed;
A projection that projects from the cover member toward the conductive member and is spaced apart from the conductive member, wherein the conductive member is projected onto the cover member in a direction perpendicular to the conductive member, and the conductive member A protrusion (71; 171; 271; 371; 471; 571; 671; 771; 871) having at least a part in a space (S1) formed by connecting the outer shape of
A battery pack comprising:   2. The battery pack according to claim 1, wherein the protrusions (71; 871, 71) are provided such that a volume of a portion existing in the space is larger on the downstream side than on the upstream side in the fluid passage.   The said protrusion part (571,71; 671,771) is provided so that the volume of the part which exists in the said space may become equivalent by the upstream and downstream in the said fluid channel | path. Battery pack.   The battery pack according to claim 1, wherein the protruding portion is provided only on the downstream side in the fluid passage.   The battery pack according to any one of claims 1, 3, and 4, wherein the protruding portion (671, 771) has a columnar shape.   The battery pack according to any one of claims 1 to 5, wherein the protruding portion (71) is provided so as to extend across the cell stacking direction with respect to the conductive member.   The said protrusion part (71; 471; 571,71) is provided so that the whole flow direction of the said cooling fluid may be provided with respect to the said electrically-conductive member. Battery pack. A conductive member (5) for connecting the electrode terminal (30a) and the electrode terminal (30b) adjacent to each other in the battery cell (30) adjacent in the cell stacking direction (T1);
A battery stack (3) that is an assembly of a plurality of the battery cells connected by the conductive member;
A support member (2) formed of a material having electrical insulation and supporting the conductive member;
A cover member (407) provided so as to form a fluid passage (70) through which a cooling fluid to be brought into contact with the conductive member flows, and the conductive member;
A smoke exhaust passage that communicates with a portion of the battery cell where the safety valve is provided and intersects the fluid passage, and is disposed so that a part of the fluid passage is interposed between the battery cell and the fluid passage. A smoke passage (1250);
A duct portion (407b) provided in the cover member and forming the smoke passage,
A protrusion (407a) protruding into the fluid passage from the duct portion toward the battery cell;
A battery pack comprising:

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