JP6453731B2 - Battery pack - Google Patents

Description

  The present invention relates to a battery pack in which one or more battery stacks in which battery cells and resin frames are alternately stacked are accommodated in a case to form a pack.

  2. Description of the Related Art Conventionally, battery packs in which one or more battery stacks in which battery cells and resin frames are stacked are accommodated in a case and packed into a pack are widely known. Such a battery pack is mounted on, for example, an electric vehicle. In recent years, there has been a strong demand for such battery packs to be further miniaturized, in particular, to reduce planar dimensions.

  Therefore, it has been proposed to eliminate the smoke exhaust passages and cooling air passages that were conventionally installed on both sides of the battery stack in the width direction, and to provide smoke exhaust passages and cooling air passages on the upper or lower side of the battery stack instead. ing. According to such a configuration, the planar size of the battery stack can be reduced.

Japanese Patent Application Laid-Open No. 2012-164591

  However, when a fluid passage or the like is provided on the upper side of the battery stack, there is a possibility that the wiring of the wiring connected to each battery cell may be complicated. That is, when there is no fluid passage or the like on the upper side of the battery stack, the wiring extending from each battery cell is collected and distributed at the center in the width direction of the battery stack, and then led to a necessary electronic circuit. . On the other hand, when a fluid passage or the like is provided on the upper side of the battery stack, when collecting the wiring extending from each battery cell, it must be routed around the fluid passage or the like, and the wiring may be bent or interfere with other members. It was easy to occur. Further, when a fluid passage or the like is present on the upper side of the battery stack, the wiring is often positioned near the end portion in the width direction of the battery stack as compared with the case where there is no fluid passage. In this case, the wiring easily interferes with other members, particularly the edge portions of the other members, and the wiring is easily damaged. Of course, damage to the wiring can be prevented by paying attention to the interference between the wiring and other members and performing wiring work. However, in this case, the efficiency of wiring arrangement work is greatly reduced.

  Patent Document 1 discloses a power supply device that includes a wiring path that accommodates a wiring connected to a battery cell and guides the wiring to the front of the battery stack. The wiring path of Patent Document 1 is shaped so that the wiring can be drawn out to the outside after the wiring is collected at the center in the width direction at a position ahead of the front end of the battery stack. By providing such a wiring path, interference between the wiring and other members can be effectively prevented, and damage to the wiring can be prevented. However, in the configuration of Patent Document 1, the structure of the wiring path has to be changed according to the change of the structure of the battery pack, and the versatility is poor. Further, in Patent Document 1, it is not considered to install a fluid passage on the upper side of the battery stack, and no contrivance for avoiding interference between the fluid passage and the wiring passage is disclosed. Therefore, the wiring path of Patent Document 1 has been difficult to apply to a battery pack in which a fluid passage is installed on the upper side of the battery stack, that is, a battery pack having a reduced plane size.

  Therefore, an object of the present invention is to provide a battery pack that can effectively prevent a reduction in the efficiency of wiring work while reducing the installation space.

  The battery pack of the present invention includes one or more battery stacks in which a plurality of battery cells and resin frames are alternately stacked, and wiring for detecting the voltage of each battery cell, and is connected to each of the plurality of battery cells. A plurality of wires, an insulating cover covering the terminals of the battery cell, a pair of end plates disposed at both ends of the battery stack, and a wiring passage through which the plurality of wires are passed, A wiring path disposed on the terminal forming surface and extending in the stacking direction, and a restraint band whose both ends are fastened to the pair of end plates, to the battery stack via the pair of end plates A restraining band that restrains the movement of the battery stack by applying a compressive force in the stacking direction, a wiring protector that accommodates the plurality of wires coming out from one end of the wiring passage, and the wiring A guide plate swingably connected to one end of the path, wherein the plurality of wirings coming out from one end of the wiring path are mounted, and the guide plate guides the plurality of wirings to the wiring protector; The guide plate is provided with a rib that defines a swing range of the guide plate by contacting another member on a surface opposite to a surface on which the plurality of wirings are placed. The resin frame is a connecting portion provided with a band insertion hole through which the restraining band is inserted, and is connected in contact with the connecting portion of the adjacent resin frame protruding in the protruding direction of the terminal of the battery cell. The insulating cover includes a protective portion that accommodates a portion of the restraining band that protrudes forward from the tip of the band insertion hole and is exposed to the outside. With such a configuration, the swing range of the guide plate is restricted, and the wiring placed on the guide plate is prevented from bending at a steep angle and coming into contact with other members. As a result, it is possible to prevent a reduction in the distribution efficiency. Further, by making the guide plate swingable, the wiring can be directed in a relatively free direction, and the dimensions in the stacking direction of the battery pack can be reduced while improving the routing efficiency. In addition, interference between the front end portion of the restraining band and the wiring is effectively prevented, and damage to the wiring can be prevented. As a result, since the routing work can be performed without worrying about the interference between the restraining band and the wiring, the efficiency of the routing work can be improved.

  In a preferred embodiment, the battery cell includes a case that accommodates the one or more battery stacks, each battery cell has the two terminals spaced apart in the width direction, and each resin frame is more than the two terminals. Each of the connecting portions is in contact with the case, and the two connecting portions, the case, and the terminal forming surface of the battery cell, The space surrounded by the circle is a fluid passage through which fluid flows, and the wiring passage is disposed on both sides in the width direction with the two terminals interposed therebetween. With this configuration, it is not necessary to provide separate fluid passages on both sides in the width direction of the battery stack. As a result, the width direction dimension of the battery pack can be reduced.

  As described above, according to the present invention, it is possible to effectively prevent a reduction in the efficiency of wiring work while reducing the installation space.

It is a perspective view of the battery pack which is embodiment of this invention. It is a perspective view which shows an example of a battery cell. It is a schematic perspective view of a plurality of battery cells. It is a schematic perspective view which shows the mode of lamination | stacking of a resin frame and a battery cell. It is a schematic longitudinal cross-sectional view of a resin frame. It is a schematic longitudinal cross-sectional view of a battery stack. It is a schematic sectional drawing which shows the structure around a wiring channel | path. It is a side view of the front end vicinity of a battery stack. It is a disassembled perspective view of the principal part of a battery pack. It is a figure which shows the relationship between the conventional battery cell and wiring. It is a side view near the front end of the battery stack when the swing range of the guide plate is not restricted.

  Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a perspective view of a battery pack 10 according to an embodiment of the present invention. The battery pack 10 is a battery pack mounted on an electric vehicle such as a hybrid vehicle or an electric vehicle, and has a configuration suitable for being disposed in a relatively narrow space such as a lower portion of a seat. In the following, the direction in which the battery cells 14 and the resin frame 16 are arranged is referred to as “stacking direction” or “front-rear direction”, and the lower right side in FIG. 1 is referred to as “front side”. The arrangement direction of the two battery stacks 12 is referred to as “width direction” or “left-right direction”. Furthermore, the direction orthogonal to the front-rear direction and the left-right direction is referred to as “up-down direction”, and the protruding direction of the cell terminal 34 of the battery cell 14 (upper side in FIG. 1) is referred to as “upper side”.

  The battery pack 10 includes two battery stacks 12 arranged in parallel, an end plate 20 disposed at an end of the battery stack 12, a plurality of wirings that connect the battery stack 12 and an external electric circuit, and a plurality of wirings. A wiring protector 22 for housing and protecting the air, a duct 24 for guiding cooling air and smoke, and a case for housing them.

  The case includes a lower case 26 and an upper cover. In FIG. 1, the illustration of the upper cover is omitted. The lower case 26 is a sheet metal member having a substantially L-shaped cross section having a bottom plate 26a and a side plate 26b. The battery stack 12 is placed and fixed on the bottom plate 26a of the lower case 26. The upper case is a sheet metal member having a substantially L-shaped cross section having a top plate facing the bottom plate of the lower case 26 and a side plate facing the side plate of the lower case 26. The assembly work of the wiring protector 22 and the duct 24, the wiring arrangement work, and the like are performed with the upper cover removed, and when all the work is completed, the upper cover is fastened to the lower case 26.

  The battery stack 12 is configured by alternately stacking a plurality of battery cells 14 and resin frames 16. FIG. 2 is a perspective view showing an example of the battery cell 14. The battery cell 14 is a chargeable / dischargeable secondary battery, such as a nickel metal hydride battery or a lithium ion battery. The battery cell 14 has a substantially rectangular parallelepiped battery case 30, and two cylindrical cell terminals, that is, a positive electrode terminal 34 p and a negative electrode terminal 34 n protrude from the upper surface of the battery case 30. In the following description, when the positive terminal 34p and the negative terminal 34n are not distinguished, they are simply referred to as “cell terminals 34”.

  The positive electrode terminal 34p and the negative electrode terminal 34n are provided at intervals in the left-right direction. A gas discharge port 32 is formed between the positive electrode terminal 34p and the negative electrode terminal 34n on the upper surface of the battery case 30. The gas discharge port 32 is configured, for example, by forming an opening in the upper surface of the battery case 30 and closing the opening with a thin metal film or the like. Thereby, when gas is generated inside the battery case 30 and the pressure of the battery case 30 becomes higher than a predetermined value, the metal film is broken so that gas (smoke) is discharged from the gas discharge port 32. It has become.

  The plurality of battery cells 14 are electrically connected in series by a bus bar 36. This will be described with reference to FIG. FIG. 3 is a schematic perspective view of the plurality of battery cells 14. In FIG. 3, the resin frame 16 is not shown for easy viewing, but actually, the resin frame 16 is interposed between the battery cells 14.

  The plurality of battery cells 14 are arranged with their orientations alternately changed so that the positive electrode terminal 34p of one battery cell 14 and the negative electrode terminal 34n of the adjacent battery cell 14 are adjacent to each other. The bus bar 36 is a member that electrically connects the adjacent positive electrode terminal 34p and negative electrode terminal 34n. The bus bar 36 is a substantially rectangular plate made of a conductive material such as copper. Each bus bar 36 has a pair of through holes (terminal holes 36a) through which the positive terminal 34p and the negative terminal 34n of adjacent battery cells 14 are inserted. By inserting the positive electrode terminal 34p and the negative electrode terminal 34n into the terminal hole 36a, the positive electrode terminal 34p and the negative electrode terminal 34n of the adjacent battery cells 14 are electrically connected. A plurality of battery cells 14 are connected in series by electrically connecting all the positive terminals 34p and the adjacent negative terminals 34n with the bus bar 36.

  A voltage detection plate 38 is further attached to each positive terminal 34p. The voltage detection plate 38 is a substantially square plate made of a conductive material such as copper. Each voltage detection plate 38 has a through hole 38a through which the positive terminal 34p is inserted. In a state where the positive electrode terminal 34p is inserted into the through hole 38a, the voltage detection plate 38 is disposed on the bus bar 36. Each voltage detection plate 38 is connected to a voltage detection wiring 40 for detecting the voltage of each battery cell 14. Each voltage detection wiring 40 is connected to a voltage detector provided outside the battery pack 10 and is used to detect the voltage of each battery cell 14. The voltage detection wiring 40 connected to each battery cell 14 is accommodated in a wiring passage 42 installed near both ends of the battery cell 14 in the width direction, which will be described in detail later.

  Next, the resin frame 16 will be described with reference to FIGS. FIG. 4 is a schematic perspective view showing a state of lamination of the resin frame 16 and the battery cell 14. FIG. 5 is a schematic longitudinal sectional view of the resin frame 16. The resin frame 16 is a member made of an insulating material, such as resin, and includes a substantially rectangular main body 44 and a connecting portion 46 protruding from the upper end and the bottom of the main body 44.

  The main body 44 is a substantially flat plate member interposed between the battery cells 14, and a side wall that covers the side surface of the battery cell 14 is provided on the periphery thereof. As shown in FIG. 5, a plurality of ribs 44 b standing in the thickness direction are provided on the surface of the main body 44. The space partitioned by the plurality of ribs 44b serves as a cooling air flow path 48 through which cooling air flows. A plurality of openings are formed in the side wall, and these openings serve as cooling air discharge ports 44c. An opening is also formed in the bottom surface of the main body 44, and this opening serves as an inlet 44a for cooling air.

  The connecting portion 46 includes an upper connecting portion 46 that protrudes from the upper end of the main body portion 44 and a lower connecting portion 46 that protrudes from the lower end of the main body portion 44. Each resin frame 16 has a pair of upper connection portions 46 arranged at intervals in the width direction, and the pair of upper connection portions 46 are provided on the inner side in the width direction than the pair of cell terminals 34. . Each upper connecting portion 46 is formed with a through hole penetrating in the stacking direction. This through hole becomes a band insertion hole 46a through which a restraining band 54 described later is inserted.

  Moreover, as shown in FIG. 4, the upper side connection part 46 has thickness equivalent to the arrangement | positioning pitch of the battery cell 14, and protrudes in the thickness direction. And when the battery cell 14 and the resin frame 16 are laminated | stacked alternately, the lamination direction end surface of the upper connection part 46 of one resin frame 16 is in the lamination direction end surface of the upper connection part 46 of the adjacent other resin frame 16. It comes in contact with each other. As a result, when the plurality of battery cells 14 and the resin frames 16 are alternately stacked, the upper end surfaces of the plurality of upper connecting portions 46 become a single continuous surface. The height of the upper connecting portion 46 is set such that the upper end surface thereof is in contact with the bottom surface of the upper cover 27. That is, the height of the upper connecting portion 46 is substantially the same as the distance from the upper end of the main body portion 44 to the bottom surface of the upper cover 27. And by setting it as this structure, as shown in FIG. 5, between the pair of upper side connection part 46, the space enclosed by the upper surface of the pair of upper side connection part 46, the upper cover 27, and the battery cell 14 is enclosed. Will be formed. This space extends by the length of the battery stack 12 and becomes a smoke exhaust passage 50 through which gas (smoke exhaust) discharged from the battery cells 14 flows. A smoke exhaust duct 24 communicating with the outside of the battery pack 10 is connected to the front end of the smoke exhaust passage 50.

  The lower connecting portion 46 has substantially the same configuration as the upper connecting portion 46. In other words, one resin frame 16 has a pair of lower side connecting portions 46 arranged at intervals in the width direction. Each lower connection portion 46 is formed with a band insertion hole 46a penetrating in the stacking direction. The end surface in the stacking direction of the lower connecting portion 46 is in contact with the lower connecting portion 46 of another adjacent resin frame 16. Further, the lower end of the lower connecting portion 46 is in contact with the upper surface of the lower case 26. A space surrounded by the pair of lower connection portions 46, the lower case 26, and the bottom surface of the battery cell 14 is formed between the pair of upper connection portions 46. This space extends for the length of the battery stack 12 and serves as a cooling air passage 52 through which cooling air for cooling from the battery cells 14 flows. The cooling air flowing through the cooling air passage 52 flows into the cooling air flow channel 48 from the inlet 44 a formed in each resin frame 16, and to the outside of the battery stack 12 from the discharge ports 44 c provided on both sides of the resin frame 16. Released. The cooling air takes heat from the battery cells 14 in the process of flowing through the cooling air flow path 48 and cools the battery cells 14.

  As described above, in the present embodiment, the space surrounded by the connecting portion 46 provided in the resin frame 16, the case (the upper cover 27 and the lower case 26), and the battery cell 14 is a fluid passage (a smoke exhaust passage 50, The cooling air passage 52) is used. With this configuration, it is not necessary to provide a separate fluid passage on both sides of the battery stack 12. As a result, the planar dimension (width direction dimension) of the battery pack 10 can be reduced. Thus, the battery pack 10 can be installed in a place where the installation space is relatively limited, such as under the seat.

  The movement of the plurality of battery cells 14 and the resin frame 16 constituting the battery stack 12 is restricted and restricted by the pair of end plates 20 and the restraining band 54 fastened to the end plates 20. This will be described with reference to FIG. FIG. 6 is a schematic longitudinal sectional view of the battery stack 12. In FIG. 6, the battery cell 14 is not shown for easy viewing.

  The end plates 20 are members disposed at both ends of the battery stack 12 in the stacking direction, and are made of metal or the like. From the surface of the end plate 20, a rib 20a that stands on the outer side in the stacking direction stands. The fastening portion 20b protrudes from the upper and lower ends of the rib 20a. The fastening part 20b is a part fastened to the restraining band 54. The fastening portion 20b has a rivet hole 20c through which a rivet is inserted.

  The restraining band 54 is a thin metal plate. A total of two rivet holes 54 a for inserting rivets are provided at both ends of the restraining band 54. The distance between the pair of rivet holes 54a of the restraining band 54 is strictly managed according to the design length of the battery stack 12 and the like. Specifically, the distance between the rivet holes 54 a of the restraining band 54 is such that when the both ends of the restraining band 54 are rivet fastened to the fastening portion 20 b of the end plate 20, the distance between the pair of end plates 20 is the battery stack 12. It is controlled to a value that is approximately the same as or slightly smaller than the design length.

  When restraining the battery stack 12, the restraining band 54 is inserted into the band insertion hole 46a formed in the resin frame 16, and both ends of the restraining band 54 are rivet fastened to the fastening portion 20b of the end plate 20. . As a result, the distance between the pair of end plates 20 is fixed, and the battery stack 12 receives an appropriate amount of compressive force from the pair of end plates 20. By receiving this compressive force, the mutual movement of the plurality of battery cells 14 and the resin frame 16 constituting the battery stack 12 is restricted and restrained.

  Next, the process of the wiring extended from the battery cell 14 is demonstrated. As described above, the voltage detection wiring 40 is connected to each battery cell 14. The voltage detection wiring 40 passes through a wiring passage 42 disposed on the formation surface (upper surface) of the cell terminal 34 of the battery cell 14. FIG. 7 is a schematic cross-sectional view showing a configuration around the wiring passage 42. A total of two wiring passages 42 are provided in the vicinity of both ends in the width direction of the battery cell 14. Each wiring passage 42 extends in the front-rear direction (the stacking direction of the battery cells 14) and is made of a material having an insulating property. The shape of the wiring passage 42 is not particularly limited as long as it has an accommodation space for the voltage detection wiring 40. The wiring passage 42 of the present embodiment has a rectangular tube shape opened toward the cell terminal 34 side.

  Here, as described above, the voltage detection wiring 40 is connected only to the positive terminal 34p. And the right-and-left position of the positive electrode terminal 34p of the some battery cell 14 switches alternately. As a result, the plurality of voltage detection wirings 40 include a wiring connected to the right cell terminal 34 and a wiring connected to the left cell terminal 34. The voltage detection wiring 40 connected to the right cell terminal 34 is accommodated in the right wiring passage 42, and the voltage detection wiring 40 connected to the left cell terminal 34 is accommodated in the left wiring passage 42, respectively. Is done. In other words, each voltage detection wiring 40 is configured not to cross the center in the width direction of the battery cell 14. Therefore, the smoke exhaust passage 50 (see FIG. 5) or the like can be provided in the center of the battery cell 14 in the width direction.

  As shown in FIG. 8, the plurality of voltage detection wirings 40 drawn from the front end of the wiring passage 42 are bundled by the binding tool 57 and then proceed to the wiring protector 22. A guide plate 56 is provided at the front end of the wiring passage 42 to guide the plurality of voltage detection wirings 40 coming out from the wiring passage 42 to the wiring protector 22. This will be described in detail later.

  The battery pack 10 also has a plurality of temperature detection wires 41 (see FIG. 1). The temperature detection wiring 41 is a wiring connected to a temperature sensor (for example, a thermistor or the like, not shown) installed in or near the battery cell 14. The temperature sensor and the temperature detection wiring 41 are provided for each battery cell 14. Therefore, there are as many temperature detection wirings 41 as the number of battery cells 14. The temperature detection wiring 41 passes through a position on the inner side in the width direction from a connecting portion 46 described later, and is routed to the front end side of the battery stack 12. Then, they are bundled in the vicinity of the front end of the battery stack 12 and proceed to the wiring protector 22.

  The wiring protector 22 is a member that houses and protects a plurality of wirings (voltage detection wiring 40 and temperature detection wiring 41). The plurality of wirings are distributed, bundled, and output to the outside within the wiring protector 22 according to the connection destination. In other words, the plurality of wirings are connected to the connector, and the connector is further connected to the electric circuit, whereby the plurality of wirings and the electric circuit are electrically connected. Here, the number of connectors to which the plurality of wires are connected is not one, but a plurality of connectors are prepared according to the position and configuration of the electric circuit. The plurality of wires are distributed and arranged in the inside of the wire protector 22 according to the connection destination connector and the connection position in the connector. Then, the plurality of wirings go out to the outside from the output holes 22a provided in the wiring protector 22 in a distributed and aligned state.

  In some conventional battery packs, as shown in FIG. 10, the wiring extending from each battery cell is distributed and arranged and connected to the connector without providing the wiring protector 22. This configuration can be adopted because there is no smoke exhaust passage 50 at the center of the battery stack 12 in the width direction. When there is no flue gas passage 50 at the center of the battery stack 12 in the width direction, all the wiring can be collected at the center of the battery stack 12 in the width direction. It was possible to organize. In this case, a wiring protector for collecting and distributing a plurality of wirings becomes unnecessary.

  On the other hand, in the present embodiment, as described above, since there is the smoke exhaust passage 50 in the center of the battery stack 12 in the width direction, the plurality of wires extending from the left and right sides of the battery cell 14 are once in front of the battery stack 12. It can only be collected after it has been pulled to the position. Then, the wiring collected at a position ahead of the battery stack 12 is distributed and arranged according to the destination. At this time, if the wiring is exposed to the outside, there is a problem such as interference between the wiring and other members. This may result in damage to the wiring (including damage to the insulating coating that covers the core wire of the wiring). Therefore, in the present embodiment, the wiring protector 22 is provided in front of the battery stack 12.

  In the present embodiment, a total of two wiring protectors 22 are provided in front of each battery stack 12. The plurality of voltage detection wirings 40 are accommodated in the wiring protector 22 positioned in front of the corresponding battery stack 12. The plurality of temperature detection wires 41 are all housed in the wire protector 22 on the left side of the drawing. Therefore, the temperature detection wiring 41 taken out from the right battery stack 12 is greatly curved leftward and proceeds to the left wiring protector 22.

  Next, the guide plate 56 will be described with reference to FIG. FIG. 8 is a side view of the vicinity of the front end of the battery stack 12. As described above, the guide plate 56 on which the plurality of voltage detection wirings 40 are placed is formed at the front end of the wiring passage 42. The guide plate 56 is a plate made of an insulating material, and a binding tool 57 for bundling and binding a plurality of voltage pressure detection wires is provided at the tip of the guide plate 56. The guide plate 56 is a plate material on which the voltage detection wiring 40 drawn from one end of the wiring passage 42 is placed, and is a member that guides the plurality of voltage detection wirings 40 to the wiring protector 22. The guide plate 56 is swingable with respect to the wiring passage 42. This swing mechanism is realized, for example, by thinning the boundary portion between the guide plate 56 and the wiring passage 42 to provide elasticity. Here, the reason why the guide plate 56 is made swingable in this way is as follows.

  In order to suppress the dimension of the battery pack 10 in the stacking direction, it is preferable that the voltage detection wiring 40 and the guide plate 56 on which the voltage detection wiring 40 is placed be directed obliquely downward rather than horizontally. On the other hand, when a plurality of voltage detection wirings 40 drawn out from the wiring passage 42 are bound by the binding tool 57, the guide plate 56 is easier to work if it extends in the horizontal direction. That is, it is desirable that the guide plate 56 be horizontal when the plurality of voltage detection wirings 40 are bound, but it is desirable that the guide plate 56 be directed obliquely downward after the binding. In order to satisfy these two demands, the guide plate 56 is swingable with respect to the wiring passage 42.

  However, when the swing range of the guide plate 56 is not restricted, the voltage detection wiring 40 may be bent excessively. In this case, excessive stress is applied to the voltage detection wiring 40, or the voltage detection wiring 40 may interfere with the edge of the end plate 20, causing damage to the voltage detection wiring 40. This will be described with reference to FIG. FIG. 11 is a side view of the vicinity of the front end of the battery stack 12 when the swing range of the guide plate 56 is not restricted. As shown in FIG. 11, when the swing range of the guide plate 56 is not restricted, the voltage detection wiring 40 drawn out from the wiring passage 42 may be bent at a steep angle. In this case, stress is generated in the voltage detection wiring 40 at the bent portion, and the voltage detection wiring 40 may be damaged. Further, the voltage detection wiring 40 bent at a steep angle hits the edge of the end plate 20, and there is a possibility that the voltage detection wiring 40 may be damaged. In particular, in the present embodiment, the voltage detection wiring 40 passes near both ends in the width direction of the battery stack 12. In this case, the voltage detection wiring 40 easily hits the edges (both ends in the width direction) of the end plate 20 and is easily damaged as compared with the configuration in which the voltage detection wirings 40 are collected in the center in the width direction (configuration in FIG. 10).

  Therefore, in this embodiment, as shown in FIG. 8, in order to prevent the voltage detection wiring 40 from being damaged, the back surface of the guide plate 56, that is, the surface opposite to the mounting surface of the voltage detection wiring 40 is provided. Ribs 58 are provided on the surface. The rib 58 is in contact with the end plate 20, so that the swing range of the guide plate 56 is restricted. As a result, the guide plate 56 is prevented from bending at a steep angle with respect to the wiring passage 42, and as a result, the voltage detection wiring 40 is prevented from bending at a steep angle. As a result, it is possible to effectively prevent damage due to bending stress of the voltage detection wiring 40 and damage due to contact with other members.

  Next, the insulating cover 60 that protects the cell terminals 34 will be described with reference to FIGS. FIG. 9 is an exploded perspective view of the main part of the battery pack 10. The insulating cover 60 is a flat plate member made of an insulating material such as resin. The insulating cover 60 is disposed on the upper side of the cell terminal 34 of the battery cell 14 and prevents foreign matter from entering the cell terminal 34. In the present embodiment, a protective portion 62 that accommodates the front end of the restraining band 54 is provided at the front end of the insulating cover 60.

  The protective portion 62 is a member that accommodates a portion of the upper restraining band 54 that protrudes forward from the front end of the connecting portion 46 and is exposed to the outside. The protective part 62 is connected to the front end of the insulating cover 60 and the inner end in the width direction. By disposing the insulating cover 60 on the upper side of the cell terminal 34, the protective part 62 is automatically moved from the upper side to the restraining band. 54 can be put on. The protection part 62 is a substantially box-shaped body with its bottom and rear end surfaces opened. Therefore, when the protection part 62 is put on the restraint band 54, both sides in the width direction, the top face, and the front end face of the restraint band 54 are covered with the protection part 62.

  The reason why the protective portion 62 is provided to protect the front end of the restraining band 54 is to prevent interference between the wirings 40 and 41 and the restraining band 54. That is, as described above, in this embodiment, the wirings 40 and 41 drawn from the front end of the battery stack 12 proceed to the wiring protector 22 arranged in front of the battery stack 12. In the process toward the wiring protector 22, the wirings 40 and 41 may come into contact with the restraining band 54. The restraint band 54 is a thin plate made of metal, and if the wires 40 and 41 come into contact with the restraint band 54, the wires 40 and 41 may be damaged. Therefore, in the present embodiment, a protection unit 62 that covers the restraining band 54 is provided to prevent the wirings 40 and 41 and the restraining band 54 from contacting each other. Further, in the present embodiment, the protective portion 62 is integrated with a conventionally provided member such as the insulating cover 60. Therefore, the restraint band 54 can be protected by performing a conventionally required operation of installing the insulating cover 60. In other words, according to the present embodiment, it is possible to protect the restraint band 54 without adding a new process, and to prevent the wirings 40 and 41 from being damaged.

  As is apparent from the above description, according to the present embodiment, the swingable guide plate 56 is provided at the front end of the wiring passage 42 through which the voltage detection wiring 40 passes. By providing the guide plate 56, it is possible to reduce the dimension in the stacking direction of the battery pack 10 while facilitating the bundling work of the voltage detection wiring 40. In addition, by providing the rib 58 on the back surface of the guide plate 56, the swing range of the guide plate 56 can be regulated, and the voltage detection wiring 40 can be prevented from bending at a steep angle and contacting with other members. As a result, damage to the voltage detection wiring 40 can be effectively prevented. In this embodiment, since the protective portion 62 that accommodates the front end (exposed portion) of the restraining band 54 is provided at the front end of the insulating cover 60, the contact between the wirings 40 and 41 and the restraining band 54 is a concern. Therefore, the wiring work of the wirings 40 and 41 can be performed. As a result, the efficiency of the routing work of the wirings 40 and 41 can be improved.

  Such a configuration is particularly useful when a fluid flow path (smoke exhaust passage 50) is provided at the center in the width direction of the battery stack 12 as in this embodiment. That is, when the fluid passage is provided at the center in the width direction of the battery stack 12, the width dimension of the battery stack 12 can be reduced, while a plurality of wires are gathered at the center on the upper side of the battery stack 12 as shown in FIG. The problem of being unable to do so arises. Therefore, when a fluid passage is provided in the center of the battery stack 12 in the width direction, a plurality of wirings 40 and 41 must be collected at a position in front of the battery stack 12. In this case, the plurality of wirings 40 and 41 are likely to come into contact with other members or bend suddenly in the process of being collected. According to the technique of this embodiment, such contact of the wirings 40 and 41 with other members and rapid bending can be prevented. That is, according to the present embodiment, it is possible to prevent a reduction in the efficiency of the routing work of the wirings 40 and 41 and to prevent the wirings 40 and 41 from being damaged while reducing the planar size of the battery pack 10.

  In addition, the structure demonstrated so far is an example, and may be changed suitably. For example, in this embodiment, two battery stacks 12 are provided, but this number may be changed as appropriate. Further, in the present embodiment, the smoke exhaust passage 50 is provided on the upper side of the battery stack 12 and the cooling air passage 52 is provided on the lower side, but these may be reversed. In the opposite case, a gas discharge port 32 for releasing gas (smoke) may be provided on the bottom surface of the battery cell 14. In some cases, the smoke exhaust passage 50 and the cooling air passage 52 may be provided on both sides of the battery stack 12 and the wiring passage 42 may be provided on the upper side of the battery stack 12 and in the center in the width direction.

10 Battery pack, 12 Battery stack, 14 Battery cell, 16 Resin frame, 20 End plate, 22 Wiring protector, 24 Smoke duct, 26 Lower case, 27 Upper cover, 30 Battery case, 32 Gas outlet, 34 Cell terminal, 36 Bus bar, 38 Voltage detection plate, 40 Voltage detection wiring, 41 Temperature detection wiring, 42 Wiring passage, 44 Body portion, 46 Connection portion, 46a Band insertion hole, 48 Cooling air passage, 50 Smoke exhaust passage, 52 Cooling air passage , 54 Restraint band, 56 Guide plate, 57 Binder, 58 Rib, 60 Insulating cover, 62 Protection part.

Claims (2)

One or more battery stacks in which a plurality of battery cells and resin frames are alternately stacked;
Wiring for detecting the voltage of each battery cell, a plurality of wiring connected to each of a plurality of battery cells,
An insulating cover covering the terminals of the battery cells;
A pair of end plates disposed at both ends of the battery stack;
A wiring path through which the plurality of wirings are passed, the wiring path being arranged on the terminal forming surface of the battery cell and extending in the direction of the stack;
A restraint band whose both ends are fastened to the pair of end plates, and restrains movement of the battery stack by applying a compressive force in the stacking direction to the battery stack via the pair of end plates. When,
A wiring protector for accommodating the plurality of wirings coming out from one end of the wiring path;
A guide plate that is swingably connected to one end of the wiring path, and on which the plurality of wirings coming out from one end of the wiring path are placed and guides the plurality of wirings to the wiring protector The board,
With
The guide plate is provided with a rib defining a swing range of the guide plate by contacting another member on a surface opposite to a surface on which the plurality of wires are placed.
The resin frame is a connecting portion provided with a band insertion hole through which the restraining band is inserted, and the connecting portion protrudes in a protruding direction of the terminal of the battery cell and connects to a connecting portion of an adjacent resin frame. Have
The insulating cover includes a protective portion that accommodates a portion of the restraining band that protrudes forward from the tip of the band insertion hole and is exposed to the outside.
A battery pack characterized by that. The battery pack according to claim 1, further comprising:
A case containing the one or more battery stacks;
Each battery cell has two of the terminals spaced apart in the width direction,
Each resin frame has the two connecting portions provided on the inner side in the width direction than the two terminals,
The projecting direction end face of each connecting portion is in contact with the case,
A space surrounded by the two connecting portions, the case, and the terminal forming surface of the battery cell is a fluid passage through which a fluid flows,
The wiring path is arranged on both sides in the width direction across the two terminals,
A battery pack characterized by that.