JP2017112032A - Battery pack - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a battery pack that can be enhanced in reliability.SOLUTION: A battery pack 10 is mounted on a reach lift 1 including a heat generating portion T. The battery pack 10 includes a battery module 20 including plural battery cells 21, a housing 30 which has a first outer surface 33 and houses the battery module 20 therein, and a shielding plate 40 which is fixed to the housing 30 so as to confront the first outer surface 33. The first outer surface 33 is a surface opposed to the heat generation portion T when mounted on the reach lift 1. The heat shielding plate 40 contains a fixing portion 41 for fixing the heat shielding plate 40 to the housing 30, and a flow path forming portion 42 which is connected to the fixing portion 41 and forms a refrigerant flow path 45 extending in the up-and-down direction between the flow path forming portion and the first outer surface 33.SELECTED DRAWING: Figure 4

Description

  The present invention relates to a battery pack.

  Patent Document 1 describes a battery-type forklift. The forklift includes a pump driving motor that drives a hydraulic pump, a battery that supplies driving power to the electric motor, and a controller for traveling and work control. In this forklift, a pump driving motor that generates heat during operation and an electrical device such as a controller with low heat resistance are arranged apart from each other with a battery in between.

Japanese Patent Laid-Open No. 2001-130885

  In the forklift described in Patent Document 1, as described above, the motor and the electric device are separated from each other with the battery interposed therebetween, thereby preventing the electric device from being heated by the heat generated by the motor or the like. The cooling effect is improved. However, in the forklift described in Patent Document 1, there is a risk that the battery may be heated because the motor or the like adjacent to the battery generates heat. Moreover, in the forklift described in Patent Document 1, improvement of the cooling effect of the battery itself has not been studied. From these viewpoints, according to the forklift described in Patent Document 1, there is a risk that the reliability of the battery may be lowered, for example, the durability of the battery may be lowered due to a rise in battery temperature.

  Then, an object of this invention is to provide the battery pack which can improve reliability.

  A battery pack according to the present invention is a battery pack that is mounted on a vehicle including a heat generating portion, and includes a battery module including a plurality of battery cells, a housing having a first outer surface, and housing the battery module; A first plate-like member fixed to the housing so as to face the first outer surface, and the first outer surface is a surface facing the heat generating portion, and the first plate-like member is A first coolant channel is formed between the first fixing part for fixing the first plate-like member to the housing and the first outer surface connected to the first fixing part and extending in the vertical direction. And a first flow path forming part.

  In this battery pack, the housing that houses the battery module includes a first outer surface that faces the heat generating portion of the vehicle. A first plate-like member is fixed to the housing so as to face the first outer surface. In the first plate-like member, the first flow path forming portion forms a first refrigerant flow path extending in the up-down direction between the first outer surface of the housing. For this reason, the heat from the heat generating part of the vehicle is blocked by the first flow path forming portion of the first plate-like member and the first refrigerant flow path, and is difficult to reach the battery pack. Therefore, it is suppressed that a battery cell is heated with the heat from the heat-emitting part of a vehicle. In the first refrigerant flow path extending in the up-down direction, a refrigerant (for example, air) flows due to, for example, a chimney effect. Therefore, in the first refrigerant flow path, heat dissipation from the battery cells is promoted in addition to the interruption of heat from the heat generating portion. Therefore, according to this battery pack, it is possible to suppress a decrease in durability due to a temperature rise of the battery cell and to improve reliability.

  In the battery pack according to the present invention, the first fixing portion is disposed on the first outer surface, and the first flow path forming portion protrudes from the first fixing portion so as to be separated from the first outer surface. The first plate-like member is fixed to the housing by fastening the first fixing part to the first outer surface by the fastening member, and the first flow path forming part from the first fixing part The amount of protrusion of may be larger than the amount of protrusion of the fastening member from the first fixing portion. In this case, it is avoided that the fastening member protrudes most in the entire outer shape of the battery pack. For this reason, for example, when the battery pack is mounted on the vehicle or when the battery pack is removed from the vehicle, the fastening member is prevented from coming into contact with the vehicle-side components. As a result, the fixing of the first plate member to the housing is stabilized, and the reliability is further improved.

  In the battery pack according to the present invention, the first flow path forming portion may have a corrugated shape by arranging concave and convex portions extending in the vertical direction along the first outer surface. In this case, heat dissipation through the first refrigerant channel is improved by increasing the surface area of the first channel forming portion. In addition, the strength of the first flow path forming portion is improved.

  In the battery pack according to the present invention, the casing includes a bottom surface that is connected to the lower end of the first outer surface and extends in a direction intersecting the first outer surface, and the bottom surface is in a direction intersecting the first outer surface. A groove that extends along the first outer surface may be formed. In this case, the refrigerant flowing through the groove toward the first outer surface can be introduced into the first refrigerant flow path. For this reason, the heat dissipation through the first refrigerant channel is improved.

  In the battery pack according to the present invention, the lower end of the first flow path forming portion may be located between the flat portion defining the groove portion on the bottom surface and the bottom portion of the groove portion. In this case, the refrigerant that flows toward the first outer surface along the bottom of the groove can be reliably introduced into the first refrigerant flow path.

  In the battery pack according to the present invention, the lower end portion including the lower end of the first flow path forming portion may be inclined so as to approach the first outer surface toward the bottom surface. In this case, the refrigerant that flows toward the first outer surface along the bottom of the groove can be more reliably introduced into the first refrigerant flow path.

  The battery pack according to the present invention includes a second plate-shaped member fixed to the housing on the second outer surface opposite to the first outer surface of the housing, and the second plate-shaped member is a second plate-shaped member. Forming a second refrigerant channel extending in the vertical direction between the second fixing portion for fixing the plate-like member to the housing and the second outer surface connected to the second fixing portion. And the bottom surface is connected to the lower end of the second outer surface, and the groove portion may extend to reach the second outer surface. In this case, heat dissipation of the battery cell can be promoted via the second refrigerant flow path. In particular, in this case, the refrigerant flowing through the groove toward the second outer surface can be introduced into the second refrigerant flow path. For this reason, for example, if the direction in which the groove portion extends is set so as to follow the vehicle advancing / retreating direction, the refrigerant flowing through the groove portion as the vehicle advances or retreats is set to either the first refrigerant flow path or the second refrigerant flow path. It becomes possible to introduce.

  An object of the present invention is to provide a battery pack capable of improving reliability.

It is a side view which shows a reach lift. It is a schematic diagram which shows the vehicle body shown by FIG. It is a figure which shows the battery module shown by FIG. It is a figure which shows the battery pack shown by FIG. It is a figure which shows the modification of the battery pack shown by FIG. It is a schematic diagram which shows the vehicle body shown by FIG. It is a figure which shows the battery pack shown by FIG. It is a figure which shows the battery pack shown by FIG. It is sectional drawing which shows a mode that a refrigerant | coolant is introduce | transduced into a refrigerant flow path. It is sectional drawing which shows the modification of the battery pack shown by FIG. It is sectional drawing which shows the modification of the battery pack shown by FIG.

Subsequently, a battery pack according to an embodiment of the present invention will be described in detail with reference to the drawings. In the description of the drawings, the same elements and corresponding elements may be denoted by the same reference numerals, and redundant descriptions may be omitted.
[First Embodiment]

  The battery pack according to the present embodiment is mounted on a vehicle. The vehicle is, for example, an industrial vehicle. An example of the industrial vehicle is a forklift that performs a cargo handling operation. Hereinafter, a reach lift will be described as an example of a forklift. FIG. 1 is a side view showing a reach lift. FIG. 2 is a schematic diagram showing the vehicle body shown in FIG. 2A is a schematic cross-sectional view in plan view, and FIG. 2B is a schematic cross-sectional view in side view. As shown in FIGS. 1 and 2, the reach lift 1 includes a vehicle body 2, a cargo handling device 3, and a cab 4. The reach lift 1 is a compact forklift that a driver stands and operates.

  Therefore, the vehicle body 2 of the reach lift 1 is smaller than the vehicle body of the counter-type forklift. In particular, the size of the vehicle body 2 in the front-rear direction is relatively small. In the following description, “front”, “rear”, “left”, and “right” indicate directions when the direction from the cab 4 toward the cargo handling device 3 is the “front” direction. Further, “upper” and “lower” in the following description indicate a vertically upward direction and a vertically downward direction, respectively.

  The vehicle body 2 includes a pedestal portion 2a and a main body portion 2b. The pedestal portion 2 a is disposed at the lower part of the vehicle body 2. The pedestal portion 2a has a rectangular parallelepiped shape, for example. A rear wheel (drive wheel and steering wheel) 2c and a caster wheel (not shown) are provided in the lower rear portion of the pedestal portion 2a. The right rear part on the upper surface of the base part 2a is a floor E on which the driver stands.

  The main body 2b is disposed on the top of the pedestal 2a. The main body 2b is substantially L-shaped in plan view. The interior of the main body 2b is a storage space S for various devices. The front portion of the accommodation space S is a space that extends over substantially the entire region of the reach lift 1 in the left-right direction (vehicle width direction). The rear portion of the accommodation space S is a space that extends over a substantially left half region of the reach lift 1 in the left-right direction. A traveling motor 2d and a cargo handling motor 2e are disposed on the upper side of the rear portion of the accommodation space S. The traveling motor 2d is a motor that is a drive source of the drive wheels. The cargo handling motor 2 e is a motor that is a drive source of the cargo handling device 3.

  A battery pack 10 is disposed in the front part of the accommodation space S. The battery pack 10 serves as a power source for the traveling motor 2d and the cargo handling motor 2e. The traveling motor 2d, the cargo handling motor 2e, the inverter for driving them, and the like generate heat during operation and may be hotter than the battery pack 10. That is, the traveling motor 2d, the cargo handling motor 2e, the inverter, and the like constitute a heat generating portion T in the reach lift (vehicle) 1.

  The cargo handling device 3 includes a pair of left and right reach legs 3a, a fork 3b, and a mast 3c. The reach leg 3a is provided forward from the front end of the pedestal 2a. A front wheel 3d is provided at the lower front part of each reach leg 3a. The mast 3c is erected in front of the main body 2b. The mast 3c is attached to a pair of left and right reach legs 3a so as to be movable in the front-rear direction. The mast 3c is movable in the front-rear direction along a pair of left and right reach legs 3a by a driving force of a reach cylinder (not shown).

  The fork 3b is attached to the mast 3c via a lift bracket 3e. The fork 3b is a member for supporting the load A. The fork 3b is movable in the vertical direction along the mast 3c by a driving force of a lift cylinder (not shown) coupled to the mast 3c. In the cab 4, a vacant space on the right side of the rear part of the vehicle body 2 is the floor E. In the cab 4, a handle 4 a is provided on the left side of the floor E.

  Subsequently, details of the battery pack 10 will be described. FIG. 3 is a diagram illustrating the battery module illustrated in FIG. 2. FIG. 4 is a diagram showing the battery pack shown in FIGS. 4A is a perspective view, and FIG. 4B is a cross-sectional view taken along IVb-IVb in FIG. As shown in FIGS. 1 to 4, the battery pack 10 according to the present embodiment is mounted on the reach lift 1 including the heat generating portion T.

  The battery pack 10 includes a plurality of battery modules 20, a housing 30 that houses the battery modules 20, and a heat shield plate (first plate-like member) 40. As an example, the battery module 20 is arranged in seven out of a total of eight places, which are arranged in two rows in the vertical direction in the housing 30, two rows in the front-rear direction, and two rows in the left-right direction. For example, another member other than the battery module 20 can be disposed in the remaining one place. In addition, about the number of the battery modules 20, it can set suitably according to a specification. In addition, the arrangement location of the battery module 20 can be appropriately set according to the shape of the housing 30 and the like. Further, depending on the specifications of the battery pack 10, a smaller number of battery modules 20 than the number that can be accommodated in the housing 30 may be accommodated. In this case, a dummy module for adjusting the weight of the counterweight may be provided in a vacant part in the housing 30.

  The battery module 20 includes a plurality (seven in this case) of battery cells 21 stacked on each other. Each battery cell 21 is held by a holder 22. The battery cells 21 are arranged in one direction while being held by the holder 22. The battery cell 21 is, for example, a storage battery such as a non-aqueous electrolyte secondary battery such as a lithium ion secondary battery, or an electric double layer capacitor. The battery cell 21 is configured, for example, by accommodating an electrolytic solution and an electrode assembly (not shown) in a case. The electrode assembly has a plurality of separators that insulate the positive electrode, the negative electrode, and the positive electrode and the negative electrode. The plurality of positive electrodes, negative electrodes, and separators are stacked with the separators sandwiched between the positive electrodes and the negative electrodes.

  The battery cell 21 has a positive electrode terminal 21a and a negative electrode terminal 21b. The plurality of battery cells 21 are arranged so that the positive electrode terminal 21a and the negative electrode terminal 21b are adjacent to each other. Between the battery cells 21, the positive terminal 21 a and the negative terminal 21 b are electrically connected by the bus bar 23. Thereby, the battery cells 21 are connected in series with each other. A heat transfer plate 24 is provided between the battery cells 21 adjacent to each other. The heat transfer plate 24 has a substantially L-shaped flat plate shape.

  One flat plate portion in the heat transfer plate 24 is disposed between the battery cells 21 and the battery cell 21, and the other flat plate portion is disposed in contact with the housing 30. Thereby, the heat transfer plate 24 thermally connects the battery cell 21 and the housing 30. The material of the heat transfer plate 24 is, for example, a metal such as iron. End plates 25 are provided at both ends in the stacking direction of the battery cells 21. The plurality of battery cells 21 are restrained using restraining bolts 26 while being sandwiched between a pair of end plates 25, and a restraining load is applied thereto.

  A bracket 27 is attached to the outer surface 25 a of the end plate 25. The bracket 27 is formed in a substantially L-shaped flat plate shape using, for example, a metal such as iron. The bracket 27 includes a first flat plate portion 27a and a second flat plate portion 27b formed so as to be orthogonal to the first flat plate portion 27a at one edge portion of the first flat plate portion 27a. . The first flat plate portion 27 a is fixed to the end plate 25 using bolts 28. The second flat plate portion 27 b is fixed to the housing 30 using bolts 29. The battery module 20 is fixed to the housing 30 using a pair of brackets 27.

  The housing 30 includes a rectangular box-shaped storage portion 31 that is open on one side, and a rectangular plate-shaped lid portion 32 that is fixed to the storage portion 31 so as to close an open portion of the storage portion 31. The battery module 20 is accommodated in the accommodating portion 31 in a state where the lid portion 32 is fixed to the accommodating portion 31. The battery module 20 on the bottom wall 31a side of the accommodating portion 31 among the plurality of battery modules 20 is fixed to the bottom wall 31a. The battery module 20 on the bottom wall 31 a side is thermally connected to the bottom wall 31 a via the heat transfer plate 24. The battery module 20 on the lid portion 32 side among the plurality of battery modules 20 is fixed to the lid portion 32. The battery module 20 on the lid portion 32 side is thermally connected to the lid portion 32 via the heat transfer plate 24.

  The housing 30 includes a first outer surface 33 and a second outer surface 34 opposite to the first outer surface 33. The first outer surface 33 is an outer surface on the opposite side of the housing portion 31 in the lid portion 32. The second outer surface 34 is an outer surface of the bottom wall 31a opposite to the lid portion 32. The first outer surface 33 is a surface facing the heat generating portion T when the battery pack 10 is mounted on the reach lift 1. The first outer surface 33 and the second outer surface 34 are parallel to each other and intersect the advance direction and the reverse direction of the reach lift 1. The housing 30 includes a bottom surface 35 connected to the lower end of the first outer surface 33 and the lower end of the second outer surface 34. The bottom surface 35 is a surface along the forward direction and the backward direction of the reach lift 1.

  The heat shield plate 40 is fixed to the housing 30 so as to face the first outer surface 33 of the housing 30. The heat shield plate 40 is made of, for example, a metal such as aluminum, iron, and copper, or a resin. Here, as an example, the heat shield plate 40 is provided so as to cover the entire first outer surface 33 when viewed from the direction intersecting the first outer surface 33. The heat shield plate 40 includes a pair of plate-like fixing portions (first fixing portions) 41, a plate-like flow passage forming portion (first flow passage forming portion) 42, and a pair of plate-like connecting portions 43. And including. The fixing part 41, the flow path forming part 42, and the connection part 43 are integrally formed with each other.

  The fixing portion 41 is used for fixing the heat shield plate 40 to the housing 30. More specifically, the fixing portion 41 is disposed at both left and right end portions of the first outer surface 33 and has a rectangular plate shape extending in the vertical direction along the first outer surface 33. The heat shield plate 40 is fixed to the housing 30 by fastening the fixing portion 41 to the first outer surface 33 with a bolt (fastening member) 44 in a state where the fixing portion 41 is in contact with the first outer surface 33. Yes. The bolt 44 penetrates the fixing portion 41, the lid portion 32, and the accommodating portion 31, and fastens them together. A head 44 h of the bolt 44 protrudes from the fixing portion 41.

  The flow path forming part 42 is connected to the fixing part 41 via the connection part 43. More specifically, the flow path forming portion 42 extends from one fixing portion 41 to the other fixing portion 41 and is connected to each fixing portion 41 via a connection portion 43. Here, as an example, the flow path forming portion 42 has a flat plate shape extending so as to cover the entire portion where the battery module 20 is disposed in the lid portion 32 when viewed from the direction intersecting the first outer surface 33. . Here, the flow path forming portion 42 is substantially parallel to the first outer surface 33.

  The flow path forming part 42 protrudes from the fixed part 41 so as to be separated from the first outer surface 33. The protrusion amount A42 of the flow path forming portion 42 from the fixed portion 41 is larger than the protrusion amount A44 of the head portion 44h of the bolt 44 from the fixed portion 41. Therefore, the flow path forming portion 42 protrudes from the head 44 h of the bolt 44 as the entire outer shape of the battery pack 10.

  The flow path forming portion 42 faces the first outer surface 33 while being separated from the first outer surface 33. Thereby, the flow path forming unit 42 forms a refrigerant flow path (first refrigerant flow path) 45 extending in the vertical direction between the first outer surface 33 and the first outer surface 33. The refrigerant channel 45 is opened in the vertical direction. Therefore, for example, a refrigerant (for example, air) can be introduced from the lower end of the refrigerant flow path 45 and the refrigerant can be discharged from the upper end of the refrigerant flow path 45. That is, a refrigerant layer (for example, an air layer) that can move at least in the vertical direction is formed between the first outer surface 33 and the heat generating portion T.

  As described above, in the battery pack 10, the housing 30 that houses the battery module 20 includes the first outer surface 33 that faces the heat generating portion T when the battery pack 10 is mounted on the reach lift 1. A heat shield plate 40 is fixed to the housing 30 so as to face the first outer surface 33. In the heat shield plate 40, the flow path forming portion 42 is provided between the first outer surface 33 of the housing 30 and the refrigerant flow path 45 extending in the vertical direction with the battery pack 10 mounted on the reach lift 1. Forming. For this reason, the heat from the heat generating portion T of the reach lift 1 is blocked by the flow path forming portion 42 of the heat shield plate 40 and the refrigerant flow path 45 and is unlikely to reach the battery pack 10.

  Therefore, it is suppressed that the battery cell 21 is heated by the heat from the heat generating portion T of the reach lift 1. In the refrigerant flow path 45, a refrigerant (for example, air) flows due to, for example, a chimney effect. Therefore, in the refrigerant flow path 45, in addition to the heat blocking from the heat generating portion T, the heat radiation of the battery cell 21 is promoted. Therefore, according to the battery pack 10, it is possible to suppress a decrease in durability due to a temperature rise of the battery cell 21 and improve reliability.

  In the battery pack 10, the fixing portion 41 of the heat shield plate 40 is disposed on the first outer surface 33, and the flow path forming portion 42 protrudes from the fixing portion 41 so as to be separated from the first outer surface 33. Yes. The heat shield plate 40 is fixed to the housing 30 by fastening the fixing portion 41 to the first outer surface 33 with bolts 44. The protrusion amount A42 of the flow path forming portion 42 from the fixing portion 41 is larger than the protrusion amount A44 of the head portion 44h of the bolt 44 from the fixing portion 41.

  For this reason, it is avoided that the head 44h of the bolt 44 protrudes most in the entire outer shape of the battery pack 10. As a result, for example, when the battery pack 10 is mounted on the reach lift 1 or when the battery pack 10 is removed from the reach lift 1, the head 44h of the bolt 44 contacts the components on the reach lift 1 side. It is suppressed. Therefore, the fixing of the heat shield plate 40 to the housing 30 is stabilized, and the reliability is further improved.

  Here, in the battery pack 10, the heat shield plate 40 may not cover the entire first outer surface 33 when viewed from the direction intersecting the first outer surface 33. In other words, in the battery pack 10, a heat shield plate may be selectively provided on a part of the first outer surface 33 when viewed from the direction intersecting the first outer surface 33. An example of this case will be described. The battery pack 10 can include a heat shield plate 40A shown in FIG. 5A instead of the heat shield plate 40.

  The heat shield plate 40 </ b> A is provided only in the facing region F that faces the heat generating portion T in the first outer surface 33. Here, the facing region F extends from one end (left end) of the first outer surface 33 to the center of the first outer surface 33. One end (left end) of the facing region F coincides with one end of the first outer surface 33. The other end portion (right end portion) of the facing region F is located at the center portion of the first outer surface 33 so as to be positioned between the battery modules 20 adjacent to each other when viewed from the direction intersecting the first outer surface 33. doing.

  The heat shield plate 40 </ b> A includes a pair of fixing portions 41, a flow path forming portion (first flow path forming portion) 42 </ b> A, and a pair of connection portions 43. The fixed portion 41 is disposed at both ends of the facing region F. That is, one fixing portion 41 is disposed at one end portion of the first outer surface 33. The other fixing portion 41 is disposed at the center of the first outer surface 33 so as to be positioned between the battery modules 20 adjacent to each other when viewed from the direction intersecting the first outer surface 33. Here, the heat shield plate 40A is fixed to the casing 30 by fastening one fixing portion 41 to the first outer surface 33 with a bolt 44 and welding the other fixing portion 41 to the lid portion 32. Yes. Thus, the fixing of the heat shield plate to the housing 30 is not limited to the fastening by the fastening member, and any fixing method such as welding or adhesion can be used.

  The flow path forming part 42 </ b> A is connected to the fixing part 41 via the connection part 43. More specifically, the flow path forming part 42 </ b> A extends from one fixing part 41 to the other fixing part 41, and is connected to each fixing part 41 via a connection part 43. Therefore, here, the flow path forming portion 42 </ b> A has a flat plate shape extending so as to cover only the facing region F when viewed from the direction intersecting the first outer surface 33. Further, the flow path forming portion 42 </ b> A is substantially parallel to the first outer surface 33. The flow path forming portion 42 </ b> A faces the first outer surface 33 while being separated from the first outer surface 33. Thereby, the flow path forming part 42 </ b> A forms the refrigerant flow path 45 between the first outer surface 33 and the facing area F.

  As described above, if the refrigerant flow path 45 is formed only in the facing region F facing the heat generation site T in the first outer surface 33, the heat from the heat generation site T can be blocked with the minimum necessary configuration. it can. In addition, according to the shape of the opposing area | region F, the position which provides 40 A of heat shields can be selected arbitrarily. For example, in the vertical direction, when the facing region F occurs only in a part of the first outer surface 33 and / or when the facing region F occurs only in a part of the inner part of the first outer surface 33, The refrigerant flow path 45 may be formed by providing the heat shield plate 40A and the flow path forming portion 42A only in part.

  In particular, when the heat generating portion T is relatively lower, that is, the facing region F is formed on a part of the first outer surface 33 so as to correspond to the lower battery module 20 among the battery modules 20 arranged in the vertical direction. When it occurs, it is effective to form the refrigerant flow path 45 only in a part thereof. This is because the refrigerant heated by the heat of the heat generating part T rises in the refrigerant flow path 45 toward the upper battery module 20 not facing the heat generating part T, thereby warming the battery module 20. It is for suppressing.

  On the other hand, as shown in FIG. 5B, the battery pack 10 can include a heat shield plate 40 </ b> B instead of the heat shield plate 40. The heat shield plate 40B is fixed to the housing 30 so as to face the first outer surface 33. As an example, the heat shield plate 40 </ b> B is provided so as to cover the entire first outer surface 33 when viewed from the direction intersecting the first outer surface 33. The heat shield plate 40 </ b> B includes a pair of fixing parts 41, a flow path forming part (first flow path forming part) 42 </ b> B, and a pair of connection parts 43. Here, the heat shield plate 40 </ b> B is fixed to the housing 30 by fastening the fixing portion 41 to the first outer surface 33 with a bolt 44.

  The flow path forming part 42 </ b> B is connected to the fixing part 41 via the connection part 43. More specifically, the flow path forming part 42 </ b> B extends from one fixing part 41 to the other fixing part 41, and is connected to each fixing part 41 via a connection part 43. The flow path forming part 42 </ b> B faces the first outer surface 33 while being separated from the first outer surface 33. Thereby, the flow path forming part 42 </ b> B forms the refrigerant flow path 45 between the first outer surface 33.

  The flow path forming portion 42 </ b> B has a corrugated shape by arranging a plurality of concave portions 42 a and convex portions 42 b extending in the vertical direction in the horizontal direction along the first outer surface 33. Here, the flow path forming part 42B has a constant thickness also in the concave part 42a and the convex part 42b. Therefore, the flow path forming portion 42B is relatively far away from the first outer surface 33 in the convex portion 42b as compared with the concave portion 42a. Therefore, the coolant channel 45 is relatively wide at the convex portion 42b and relatively narrow at the concave portion 42a. Here, the flow path forming portion 42B is also separated from the first outer surface 33 in the concave portion 42a. Therefore, the coolant channel 45 is also formed in the recess 42a.

Thus, if the flow path forming part 42B forming the refrigerant flow path 45 is formed into a corrugated plate shape by the concave part 42a and the convex part 42b, the surface area of the flow path forming part 42B is increased and the refrigerant flow path 45 is interposed. Improved heat dissipation. Further, the strength of the flow path forming part 42B is improved. Note that the heat shield plate 40B and the flow path forming portion 42B may be selectively provided only on a part of the first outer surface 33, similarly to the heat shield plate 40A and the flow path forming portion 42A.
[Second Embodiment]

  FIG. 6 is a schematic diagram showing the vehicle body shown in FIG. 6A is a schematic cross-sectional view in plan view, and FIG. 6B is a schematic cross-sectional view in side view. 7 and 8 are diagrams showing the battery pack shown in FIGS. 7A is a perspective view, and FIG. 7B is a cross-sectional view taken along VIIb-VIIb in FIG. 7A. FIG. 8A is a front view, and FIG. 8B is a cross-sectional view taken along line VIIIb-VIIIb in FIG. As shown in FIGS. 1 and 6 to 8, the battery pack 10 </ b> A according to the present embodiment is mounted on a reach lift 1 </ b> A including a heat generating portion T. The reach lift 1 </ b> A is the same as the reach lift 1 except that the battery pack 10 </ b> A is provided instead of the battery pack 10.

  The battery pack 10A is different from the battery pack 10 in that a plurality of grooves 35g are provided on the bottom surface 35 of the housing 30 and a heat shield plate (second plate-like member) 50 is further provided. Yes. The groove portions 35g extend along directions intersecting the first outer surface 33 and the second outer surface 34, respectively. The groove portion 35 g reaches both the first outer surface 33 and the second outer surface 34. Therefore, the groove portion 35 g is open on both the first outer surface 33 and the second outer surface 34. Here, the groove part 35g has a rectangular parallelepiped shape. Accordingly, the bottom 35b of the groove 35g is flat. A portion between adjacent groove portions 35g is also a flat portion 35p.

  Here, the heat shield plate 40 is provided so that the lower end 42 e of the flow path forming portion 42 does not reach the bottom surface 35 when viewed from the direction intersecting the first outer surface 33. In particular, the lower end 42e of the flow path forming portion 42 is located between the flat portion 35p that defines the groove portion 35g on the bottom surface 35 and the bottom portion 35b of the groove portion 35g. Therefore, as viewed from the direction intersecting the first outer surface 33, a part of the groove 35g on the bottom 35b side is covered with the flow path forming part 42, and the remaining part of the groove 35g is exposed from the flow path forming part 42. .

  The heat shield plate 50 has the same configuration as the heat shield plate 40 except for the difference in the position where the heat shield plate 50 is provided. That is, the heat shield plate 50 is fixed to the housing 30 so as to face the second outer surface 34 of the housing 30. The heat shield plate 50 is made of, for example, a metal such as aluminum, iron, and copper, or a resin. Here, as an example, the heat shield plate 50 is provided so as to cover substantially the entire second outer surface 34 when viewed from the direction intersecting the second outer surface 34. The heat shield plate 50 includes a pair of plate-like fixing portions (second fixing portions) 51, a plate-like flow passage forming portion (second flow passage forming portion) 52, and a pair of plate-like connecting portions 53. And including. The fixed part 51, the flow path forming part 52, and the connecting part 53 are integrally formed with each other.

  The fixing part 51 is used for fixing the heat shield plate 50 to the housing 30. More specifically, the fixing portion 51 is disposed at both left and right ends of the second outer surface 34 and has a rectangular plate shape extending in the vertical direction along the second outer surface 34. The heat shield plate 50 is fixed to the housing 30 by fastening the fixing portion 51 to the second outer surface 34 with a bolt (fastening member) 54 in a state where the fixing portion 51 is in contact with the second outer surface 34. Yes. The bolt 54 penetrates the fixing portion 51 and the accommodating portion 31 and fastens them together. A head 54 h of the bolt 54 protrudes from the fixing portion 51.

  The flow path forming part 52 is connected to the fixing part 51 via the connection part 53. More specifically, the flow path forming part 52 extends from one fixing part 51 to the other fixing part 51 and is connected to each fixing part 51 via a connection part 53. Here, as an example, the flow path forming part 52 has a flat plate shape extending so as to cover substantially the entire part of the housing part 31 where the battery module 20 is disposed, as viewed from the direction intersecting the second outer surface 34. is there. Here, the flow path forming part 52 is substantially parallel to the second outer surface 34.

  The flow path forming part 52 protrudes from the fixed part 51 so as to be separated from the second outer surface 34. The protrusion amount A52 of the flow path forming portion 52 from the fixed portion 51 is larger than the protrusion amount A54 of the head 54h of the bolt 54 from the fixed portion 51. The flow path forming part 52 faces the second outer surface 34 while being separated from the second outer surface 34. Thereby, the flow path forming part 52 forms a refrigerant flow path (second refrigerant flow path) 55 extending in the vertical direction between the second outer surface 34. The refrigerant channel 55 is open in the up-down direction. Therefore, for example, the refrigerant (for example, air) can be introduced from the lower end of the refrigerant flow path 55 and the refrigerant can be discharged from the upper end of the refrigerant flow path 55. That is, a refrigerant layer (for example, an air layer) that can move at least in the vertical direction is formed on the second outer surface 34.

  The heat shield plate 50 is provided so that the lower end 52 e of the flow path forming part 52 does not reach the bottom surface 35 when viewed from the direction intersecting the second outer surface 34. In particular, the lower end 52e of the flow path forming portion 52 is located between the flat portion 35p that defines the groove portion 35g on the bottom surface 35 and the bottom portion 35b of the groove portion 35g. Therefore, when viewed from the direction intersecting the second outer surface 34, a part of the groove 35 g on the bottom 35 b side is covered with the flow path forming part 52, and the remaining part of the groove 35 g is exposed from the flow path forming part 52. .

  The battery pack 10A as described above can provide the following new effects in addition to the same effects as the battery pack 10. That is, in the battery pack 10 </ b> A, the bottom surface 35 of the housing 30 is formed with a groove portion 35 g that extends to reach the first outer surface 33 along the direction intersecting the first outer surface 33. For this reason, as shown in FIG. 9A, for example, when the reach lift 1A moves forward, the refrigerant C flowing through the groove 35g toward the first outer surface 33 can be introduced into the refrigerant flow path 45. it can. For this reason, the heat dissipation through the refrigerant flow path 45 is improved.

  In particular, in the battery pack 10A, the lower end 42e of the flow path forming portion 42 is located between the flat portion 35p on the bottom surface 35 and the bottom portion 35b of the groove portion 35g. For this reason, it becomes possible to reliably introduce the refrigerant C flowing toward the first outer surface 33 along the bottom 35b of the groove 35g into the refrigerant flow path 45. Here, the refrigerant C is air around the battery pack 10A, for example, and flows through the groove 35g by moving relative to the battery pack 10A as the reach lift 1A moves forward or backward.

  Further, the battery pack 10 </ b> A includes a heat shield plate 50 on the second outer surface 34 opposite to the first outer surface 33. The heat shield plate 50 includes a flow path forming portion 52 that forms a coolant flow path 55 extending in the vertical direction between the heat shield plate 50 and the second outer surface 34. Therefore, according to the battery pack 10 </ b> A, the heat radiation of the battery cell 21 can be promoted through the refrigerant flow path 55.

  Further, the groove 35 g of the bottom surface 35 extends so as to reach the second outer surface 34. For this reason, as shown in FIG. 9B, for example, when the reach lift 1A is retracted, the refrigerant C flowing through the groove 35g toward the second outer surface 34 can be introduced into the refrigerant flow path 55. it can. Therefore, heat dissipation through the refrigerant flow path 55 is improved. In particular, the lower end 52e of the flow path forming portion 52 is located between the flat portion 35p on the bottom surface 35 and the bottom portion 35b of the groove portion 35g. For this reason, it becomes possible to reliably introduce the refrigerant C flowing toward the second outer surface 34 along the bottom 35b of the groove 35g into the refrigerant flow channel 55.

  Thus, according to the battery pack 10A, for example, if the extending direction of the groove 35g is set along the advance / retreat direction of the reach lift 1A, the refrigerant C flowing through the groove 35g as the reach lift 1A advances and retreats is allowed to flow through the refrigerant flow. It becomes possible to introduce into either the channel 45 or the refrigerant channel 55.

  Here, the battery pack 10A can be modified as shown in FIG. That is, in the battery pack 10 </ b> A, the lower end portion 42 p including the lower end 42 e of the flow path forming portion 42 may be inclined so as to approach the first outer surface 33 toward the bottom surface 35. Further, the lower end 52 p including the lower end 52 e of the flow path forming unit 52 may be inclined so as to approach the second outer surface 34 toward the bottom surface 35. The lower end 42 e is separated from the first outer surface 33, and the lower end 52 e is separated from the second outer surface 34.

  By inclining the lower end 42p in this way, the refrigerant C flowing toward the first outer surface 33 along the bottom 35b of the groove 35g is guided to the refrigerant flow path 45 by the lower end 42p, and the refrigerant flow is more reliably performed. It becomes possible to introduce into the path 45. Further, by inclining the lower end portion 52p as described above, the refrigerant C flowing toward the second outer surface 34 along the bottom portion 35b of the groove portion 35g is guided to the refrigerant flow channel 55 by the lower end portion 52p. It becomes possible to introduce into the coolant channel 55.

  11A, the battery pack 10A includes the heat shield plate 40B instead of the heat shield plate 40, and includes the heat shield plate 50B instead of the heat shield plate 50. As shown in FIG. Can do. The heat shield plate 50B has the same configuration as the heat shield plate 40B except for the difference in the position where it is provided. That is, the heat shield plate 50 </ b> B includes a pair of fixing parts 51, a flow path forming part (first flow path forming part) 52 </ b> B, and a pair of connection parts 53.

  The flow path forming part 52 </ b> B is connected to the fixed part 51 via the connection part 53. More specifically, the flow path forming part 52 </ b> B extends from one fixing part 51 to the other fixing part 51, and is connected to each fixing part 51 via a connection part 53. The flow path forming part 52 </ b> B faces the second outer surface 34 while being separated from the second outer surface 34. Thereby, the flow path forming part 52 </ b> B forms the refrigerant flow path 55 between the second outer surface 34.

  The flow path forming portion 52B has a corrugated plate shape in which a plurality of concave portions 52a and convex portions 52b extending in the vertical direction are arranged in the horizontal direction along the second outer surface 34. Here, the flow path forming portion 52B has a constant thickness also in the concave portion 52a and the convex portion 52b. Therefore, the flow path forming part 52B is relatively far away from the second outer surface 34 in the convex part 52b as compared with the concave part 52a. Therefore, the coolant channel 55 is relatively wide at the convex portion 52b and relatively narrow at the concave portion 52a. Here, the flow path forming portion 52B is also separated from the second outer surface 34 in the recess 52a. Therefore, the coolant channel 55 is also formed in the recess 52a.

  The concave portion 42a of the flow path forming portion 42B and the concave portion 52a of the flow path forming portion 52B are provided at positions facing each other as viewed in the direction intersecting the first outer surface 33 and the second outer surface 34. In addition, here, the convex portion 42b of the flow path forming portion 42B and the convex portion 52b of the flow path forming portion 52B are opposed to each other when viewed from the direction intersecting the first outer surface 33 and the second outer surface 34. Is provided. And the groove part 35g of the bottom face 35 is provided in the position corresponding to the convex parts 42b and 52b which mutually oppose, respectively. That is, the groove portion 35g extends from the convex portion 42b to the convex portion 52b facing the convex portion 42b.

  Thus, if the flow path forming part 42B forming the refrigerant flow path 45 is formed into a corrugated plate shape by the concave part 42a and the convex part 42b, the surface area of the flow path forming part 42B is increased and the refrigerant flow path 45 is interposed. Improved heat dissipation. Further, if the flow path forming part 52B that forms the refrigerant flow path 55 is formed in a corrugated plate shape by the concave part 52a and the convex part 52b, the heat dissipation via the refrigerant flow path 55 is caused by the increase in the surface area of the flow path forming part 52B. Improves. In particular, the groove portion 35g of the bottom surface 35 is provided so as to correspond to the convex portions 42b and 52b. For this reason, it is possible to sufficiently introduce the refrigerant into a relatively wide portion in the refrigerant flow paths 45 and 55.

  Furthermore, as shown in FIG. 11B, the battery pack 10 </ b> A includes a heat shield plate 40 </ b> C instead of the heat shield plate 40, and a heat shield plate 50 </ b> C instead of the heat shield plate 50. it can. In the heat shield plate 40C, a recess 42a extending in the vertical direction with respect to the flow path forming portion 42 is provided. Here, the flow path forming portion 42 is in contact with the first outer surface 33 in the concave portion 42a. Accordingly, here, two refrigerant flow paths 45 that are independent of each other across the recess 42a are formed. The recess 42 a is provided so as to be positioned between the battery modules 20 adjacent to each other when viewed from the direction intersecting the first outer surface 33. Therefore, each of the refrigerant flow paths 45 extends in the vertical direction so as to correspond to one row of the battery modules 20 arranged in the vertical direction when viewed from the direction intersecting the first outer surface 33.

  In the heat shield plate 50 </ b> C, a recess 52 a extending in the vertical direction with respect to the flow path forming portion 52 is provided. Here, the flow path forming part 52 is in contact with the second outer surface 34 in the recess 52a. Accordingly, here, two refrigerant flow paths 55 that are independent from each other with the recess 52a interposed therebetween are formed. The recess 52 a is provided so as to be positioned between the battery modules 20 adjacent to each other when viewed from the direction intersecting the second outer surface 34. Therefore, each of the refrigerant flow paths 55 extends in the vertical direction so as to correspond to one row of the battery modules 20 arranged in the vertical direction when viewed from the direction intersecting the second outer surface 34.

  The concave portion 42a of the flow path forming portion 42 and the concave portion 52a of the flow path forming portion 52 are provided at positions facing each other as viewed in the direction intersecting the first outer surface 33 and the second outer surface 34. One groove 35g among the plurality of grooves 35g is provided at a position corresponding to the recess 42a and the recess 52a. That is, one groove 35g among the plurality of grooves 35g extends from the recess 42a to the recess 52a. And the opening by the side of the 1st outer surface 33 of the groove part 35g corresponding to the recessed parts 42a and 52a is wider than the contact part of the flow-path formation part 42 and the 1st outer surface 33 in the recessed part 42a. That is, the groove 35g corresponding to the recesses 42a and 52a is opened across the two refrigerant channels 45 on the first outer surface 33 side.

  The opening on the second outer surface 34 side of the groove portion 35g corresponding to the concave portions 42a and 52a is wider than the contact portion between the flow path forming portion 52 and the second outer surface 34 in the concave portion 52a. That is, the groove 35g corresponding to the recesses 42a and 52a is opened across the two refrigerant channels 55 on the second outer surface 34 side. For this reason, the refrigerant having passed through the groove 35g is distributed and introduced into the two refrigerant flow paths 45 or the two refrigerant flow paths 55.

  As described above, in the battery pack 10A, independent refrigerant channels 45 and 55 can be provided for each of the rows of the battery modules 20 arranged in the vertical direction. In that state, the battery module 20 can be efficiently cooled by providing the groove 35g so as to distribute and introduce the refrigerant into the independent refrigerant channels 45 and 55, respectively.

  The above embodiment describes one embodiment of the battery pack according to the present invention. Therefore, the battery pack according to the present invention is not limited to the battery packs 10 and 10A. The battery pack according to the present invention can be obtained by arbitrarily modifying the battery packs 10 and 10A as long as the gist of each claim is not changed.

  For example, between the battery pack 10 according to the first embodiment and the battery pack 10A according to the second embodiment, the configurations of the respective heat shield plates can be mutually adopted. As an example, the battery pack 10 may further include a heat shield plate 50, a heat shield plate 50B, or a heat shield plate 50C. Further, the battery pack 10 may include a heat shield plate 40C instead of the heat shield plate 40. On the other hand, in the battery pack 10A, each heat shield plate may be selectively provided according to the positional relationship between the battery module 20 and the heat generating portion T, etc., similarly to the heat shield plate 40A.

  Further, for example, a plurality of heat shield plates may be used in combination with the first outer surface 33. For example, in the battery pack 10 </ b> A, the two heat shield plates 40 </ b> B can be used in combination with the first outer surface 33. In this case, the two heat shield plates 40B can be combined so that the concave portions 42a are in contact with each other and the convex portions 42b are separated from each other. In this case, the space between the convex portions 42 b of the two heat shield plates 40 </ b> B becomes the refrigerant flow path 45. In this case, the heat from the heat generating portion T can be reliably blocked by the two heat shield plates 40B themselves, and heat can be radiated through the refrigerant channel 45 formed by the two heat shield plates 40B. .

  Moreover, the shape of the groove part 35g of the bottom face 35 is not limited to a rectangular parallelepiped shape, For example, it can be set as arbitrary shapes, such as a semi-cylinder shape. However, in order to stably place the battery pack 10A on the vehicle body 2 from the bottom surface 35 side, it is desirable to flatten the portion other than the groove portion 35g of the bottom surface 35 as the flat portion 35p.

  Further, the wave shapes of the flow path forming portions 42B and 52B may be constituted by a combination of straight lines as shown in FIG. 5B and FIG. It may be configured by a combination of straight lines and curves. Further, the flow path forming portion 42B may be in contact with the first outer surface 33 in the concave portion 42a, and the flow path forming portion 52B may be in contact with the second outer surface 34 in the concave portion 52a.

  Moreover, each said heat shield board can be used as the arbitrary plate-shaped members which can maintain the clearance gap between the 1st outer surface 33 and the heat_generation | fever part T, for example. That is, as the heat shield plate, for example, a plate member having an opening on a plate surface such as expanded metal may be used.

  Furthermore, the battery pack according to the present invention is not limited to an industrial vehicle such as a forklift such as a reach lift, and may be mounted on a general vehicle. However, it is considered that forklifts such as reach lifts have more opportunities for retreat than ordinary vehicles. For this reason, the battery pack 10A that can introduce the refrigerant into the refrigerant flow path both in the forward and backward directions is particularly effective when applied to an industrial vehicle such as a forklift such as a reach lift.

  DESCRIPTION OF SYMBOLS 1,1A ... Reach lift (vehicle), 10, 10A ... Battery pack, 20 ... Battery module, 30 ... Housing | casing, 33 ... 1st outer surface, 34 ... 2nd outer surface, 35 ... Bottom surface, 35g ... Groove part, 35b ... bottom part, 35p ... flat part, 40, 40A, 40B, 40C ... heat shield plate (first plate-like member), 41 ... fixed part (first fixed part), 42, 42A, 42B ... flow path forming part (First flow path forming portion), 42a ... concave portion, 42b ... convex portion, 42e ... lower end, 42p ... lower end portion, 44 ... bolt (fastening member), 45 ... refrigerant flow passage, 50, 50B, 50C ... heat shield. Plate (second plate-like member), 51... Fixing portion (second fixing portion), 52, 52B... Channel forming portion (second channel forming portion), 52e. , A44: Projection amount.

Claims (7)

A battery pack mounted on a vehicle including a heat generating part,
A battery module including a plurality of battery cells;
A housing having a first outer surface and containing the battery module;
A first plate-like member fixed to the housing so as to face the first outer surface,
The first outer surface is a surface facing the heat generating portion;
The first plate-like member is between a first fixing portion for fixing the first plate-like member to the housing and the first outer surface connected to the first fixing portion. A first flow path forming portion that forms a first refrigerant flow path extending in the up-down direction,
Battery pack. The first fixing portion is disposed on the first outer surface;
The first flow path forming portion protrudes from the first fixing portion so as to be separated from the first outer surface,
The first plate-like member is fixed to the casing by fastening the first fixing portion to the first outer surface by a fastening member,
The protruding amount of the first flow path forming portion from the first fixed portion is larger than the protruding amount of the fastening member from the first fixed portion.
The battery pack according to claim 1. The first flow path forming portion is formed into a corrugated plate shape by arranging concave and convex portions extending in the vertical direction along the first outer surface.
The battery pack according to claim 1 or 2. The housing includes a bottom surface connected to a lower end of the first outer surface and extending in a direction intersecting the first outer surface,
A groove portion is formed on the bottom surface so as to reach the first outer surface along a direction intersecting the first outer surface.
The battery pack according to any one of claims 1 to 3. The lower end of the first flow path forming part is located between a flat part that defines the groove part on the bottom surface and a bottom part of the groove part,
The battery pack according to claim 4. The lower end portion including the lower end of the first flow path forming portion is inclined so as to approach the first outer surface toward the bottom surface.
The battery pack according to claim 5. A second plate-like member fixed to the casing on a second outer surface opposite to the first outer surface of the casing;
The second plate-like member is provided between a second fixing portion for fixing the second plate-like member to the housing and the second outer surface connected to the second fixing portion. A second flow path forming portion that forms a second refrigerant flow path extending in the up-down direction,
The bottom surface is connected to a lower end of the second outer surface;
The groove extends to reach the second outer surface,
The battery pack according to any one of claims 4 to 6.

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