JP7155032B2 - Automotive battery temperature raising device - Google Patents

Description

TECHNICAL FIELD The present invention relates to a temperature raising device for a vehicle battery, and more particularly, to a vehicle battery in which a heater is provided on the longitudinal side of the vehicle battery to efficiently warm the battery cells, thereby improving the battery characteristics. about the temperature raising device.

As a conventional battery 100, structures shown in FIGS. 6 and 7 are known. FIG. 6 is a perspective view illustrating a conventional battery 100. FIG. FIG. 7A is a perspective view illustrating a cell stack 101 of a conventional battery 100. FIG. FIG. 7(B) is a cross-sectional view for explaining a cell stack 101 of a conventional battery 100, and is a cross-sectional view of the cell stack 101 taken along line DD shown in FIG. 7(A).

As shown in FIG. 6, the battery 100 mainly includes a box-shaped housing 102, a plurality of cell stacks 101 (see FIG. 7A) disposed inside the housing 102, and It has a duct 103 that communicates with the inside, and a blower 104 that connects with the duct 103 .

For example, five cell stacks 101 are arranged inside the housing 102, the battery 100 is controlled by a PCU (not shown) mounted on the vehicle, and a motor or the like is arranged in the vehicle. to power the

As shown in FIG. 7A, each cell stack 101 includes a plurality of cells 105. The cells 105 are composed of, for example, secondary batteries such as lithium ion batteries. A concave portion 106 is formed in the side surface 105A of each cell 105 along the longitudinal direction (front-to-rear direction of the paper surface). A plurality of convex portions 107 for rectifying air and wiring 108 as a heat transfer heater are formed in the concave portion 106 .

The wiring 108 is formed of, for example, a metal wire such as copper. The wiring 108 is connected to a power supply unit (not shown), generates heat when power is supplied, and raises the temperature of the cell 105 from the outside. . As shown, the wiring 108 is arranged as evenly as possible with respect to the side surface 105A in order to evenly heat the cells 105. FIG.

As shown in FIG. 7B, in a cell stack 101, a plurality of cells 105 are arranged adjacent to each other, and recesses 106 serve as gaps between the adjacent cells 105, and extend in the longitudinal direction of the cell stack 101 (the front-rear direction on the paper surface). It is used as a cooling air passage that penetrates the The blower 104 (see FIG. 6) is controlled by the BCU (not shown) of the battery system, operates when cooling the cell 105, and blows outside air into the housing 102 (see FIG. 6). (See Patent Document 1, for example).

JP 2017-184522 A

As shown in FIG. 7A, the wiring 108 is arranged on the side surface 105A of each cell 105 forming the cell stack 101. As shown in FIG. On the other hand, as shown in FIG. 7B, gaps are formed between the cells 105 using recesses 106, and the gaps extend through the cell stack 101 in the longitudinal direction (the front-rear direction of the paper surface). .

Due to this structure, since the gap is not a closed space, it is difficult to keep the air existing in the gap in a warm state due to the heat generated by the wiring 108 . Then, it is difficult to raise the temperature of the cell 105 by interposing the heated air in the gap as a heat conduction path. As a result, as shown in FIG. 7A, the wiring 108 must be arranged as evenly as possible with respect to the side surface 105A, and power must be continuously supplied to the wiring 108 during the period in which the temperature of the cell 105 is raised. , there is a problem that it is difficult to reduce the power consumption.

In addition, when the vehicle travels in a low temperature environment such as in a cold region, the temperature of the cell 105 is raised via the wiring 108 in order to improve the characteristics of the battery 100, such as the output characteristics and discharge/charge characteristics. be. At this time, the cell 105 and the wiring 108 suddenly reach a high temperature in a low-temperature environment, causing a temperature difference, which causes dew condensation in the cell stack 101 including the cell 105 . In addition, when the wiring 108 is exposed to the side surface 105A of each cell 105, there is a risk of electric leakage due to the dew condensation. Also, the wiring 108 of the battery 100 may corrode and break due to being exposed to the dew condensation over a long period of time.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances. An object of the present invention is to provide a device for raising the temperature of a battery.

In the vehicle battery temperature raising device of the present invention, the vehicle battery temperature raising device including the temperature raising heater arranged along the longitudinal side surface of the vehicle battery housing a plurality of battery cells, The temperature-raising heater has a housing and a heating wire arranged in the housing. A close contact area is provided that is in close contact with the periphery of the outer peripheral end of the side surface of the battery for the battery, and the close contact area is an annular projection part of the side surface of the casing part that projects, and the projection is A closed space is formed between the side surface of the vehicle battery and the side surface of the housing, the space being in close contact with the side surface of the vehicle battery and inside the projecting portion.

Further, in the vehicle battery temperature raising device of the present invention, the vehicle battery temperature raising device includes a temperature raising heater arranged along the longitudinal side surface of the vehicle battery housing a plurality of battery cells. In the above, the temperature raising heater has a housing and a heating wire disposed in the housing, and the side of the housing facing the side of the vehicle battery has at least A close contact area is provided that is in close contact with a periphery of an outer peripheral edge of the side surface of the vehicle battery, and the close contact area is an annular seal member attached to the side surface of the casing, and the seal member is in close contact with the side surface of the in-vehicle battery, is inside the sealing member, and forms a sealed space between the side surface of the in-vehicle battery and the side surface of the casing. .

Further, in the vehicle battery temperature raising device of the present invention, the upper surface of the casing part is flush with the top surface of the vehicle battery, and the end surfaces of both ends in the longitudinal direction of the casing part are respectively It is characterized in that it is flush with the end surfaces of both ends in the longitudinal direction of the in-vehicle battery.

Further, in the in-vehicle battery temperature raising device of the present invention, the heating wire is disposed along the side surface of the casing, and the electric heating wire is disposed on the lower side of the side surface of the casing. The heating wires are arranged more densely than the heating wires positioned on the upper side of the side surface of the casing.

Further, in the in-vehicle battery temperature raising device of the present invention, the heating wire positioned on the lower side of the side surface of the housing section is curved or rectangular in the lateral direction of the side surface of the housing section. The heating wire, which is wired while being bent to the side of the housing, is located on the upper side of the side of the housing, at least in the central region in the longitudinal direction of the side of the housing. It is characterized in that it is wired close to the heating wire positioned on the lower side of the inside.

Further, in the vehicle battery temperature raising device of the present invention, a temperature control plate is arranged on the lower surface of the vehicle battery.

The vehicle-mounted battery temperature raising device of the present invention includes temperature-increasing heaters disposed along the longitudinal side surfaces of the vehicle-mounted battery. and a heating wire, and the side surface of the housing facing the side surface of the vehicle battery is provided with a close contact area that is in close contact with at least the periphery of the outer peripheral edge of the side surface of the vehicle battery. Due to this structure, air exists as a heat conduction path in the space between the side surface of the vehicle battery and the side surface of the housing. The side surface of the vehicle battery is heated by contact with the air heated by the heater, and the battery characteristics deteriorate especially when the vehicle runs in a low temperature environment such as a cold region. is prevented.

In addition, in the vehicle battery temperature raising device of the present invention, the side surface of the casing is formed with an annular projecting portion that partially protrudes. A closed space is formed between the side surface of the battery and the side surface of the housing. With this structure, the air in the closed space intervenes as a heat conduction path, and the vehicle battery is heated. The warmed air convects in the closed space, so that it is easy to warm and hard to cool, so that the power consumption of the heater is reduced.

In addition, in the vehicle battery temperature raising device of the present invention, an annular sealing member is attached to the side surface of the casing, and the sealing member is in close contact with the side surface of the vehicle battery. A closed space is formed between the side surface of the housing. With this structure, the air in the closed space intervenes as a heat conduction path, and the vehicle battery is heated. The warmed air convects in the closed space, so that it is easy to warm and hard to cool, so that the power consumption of the heater is reduced.

In addition, in the vehicle battery temperature raising device of the present invention, the upper surface of the casing is flush with the top surface of the vehicle battery, and the end faces of both ends in the longitudinal direction of the casing are aligned with the vehicle battery. It is flush with the end faces on both ends in the longitudinal direction of the . With this structure, the temperature raising heater is not arranged to protrude to the outside of the vehicle-mounted battery. Although the mounting area of the on-board battery in the vehicle is limited, by efficiently arranging the on-board battery, as many on-board batteries as possible can be mounted on the vehicle and the continuous running distance of the vehicle can be increased. can be extended.

Further, in the in-vehicle battery temperature raising device of the present invention, the heating wire is arranged along the side surface of the housing portion, and the heating wire positioned on the lower side of the side surface of the housing portion It is wired in a denser state than the heating wire located on the upper side in the side of the. With this structure, the air in the closed space is warmed from the lower side of the space, and an ascending air current is generated, so that the warmed air convects in the closed space. By heating the air in the sealed space as uniformly as possible, the wiring pattern of the heating wire can be partly roughened, and the power consumption of the heater can be reduced.

Further, in the in-vehicle battery temperature raising device of the present invention, the heating wire positioned on the lower side of the side surface of the housing is wired while being curved or bent in a rectangular shape in the short direction of the side surface of the housing. ing. Further, the heating wire positioned on the upper side of the side surface of the housing approaches the heating wire positioned on the lower side of the side surface of the housing at least in the central region in the longitudinal direction of the side surface of the housing. are wired together. This structure heats the air in the closed space as uniformly as possible, thereby reducing the power consumption of the heater.

Further, in the vehicle battery temperature raising device of the present invention, a temperature control plate is arranged on the lower surface of the vehicle battery. With this structure, when raising the temperature of the vehicle battery, the vehicle battery can be warmed from three directions using the temperature raising heater and the temperature control plate. On the other hand, when cooling the vehicle battery, the temperature control plate can be used to cool the vehicle battery.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. 1A is a perspective view and FIG. 1B is a plan view illustrating a vehicle equipped with an in-vehicle battery temperature raising device according to an embodiment of the present invention; 1 is a block diagram illustrating a vehicle-mounted battery temperature increasing device according to an embodiment of the present invention; FIG. BRIEF DESCRIPTION OF THE DRAWINGS It is (A) side view, (B) sectional drawing, (C) sectional drawing explaining the temperature raising apparatus of the vehicle-mounted battery which is one Embodiment of this invention. BRIEF DESCRIPTION OF THE DRAWINGS It is (A) perspective view, (B) exploded perspective view explaining the vehicle battery which is one Embodiment of this invention. 1A and 1B are a perspective view and a cross-sectional view, respectively, illustrating a state in which a vehicle-mounted battery temperature raising device according to an embodiment of the present invention is disposed; FIG. 1 is a perspective view illustrating a conventional battery; FIG. It is (A) a perspective view explaining the cell stack of the conventional battery, and (B) sectional drawing.

DESCRIPTION OF THE PREFERRED EMBODIMENTS A vehicle-mounted battery temperature raising device 10 (hereinafter referred to as "temperature raising device 10") according to an embodiment of the present invention will be described in detail below with reference to the drawings. In the description of the present embodiment, in principle, the same reference numbers are used for the same members, and repeated descriptions are omitted.

FIG. 1A is a perspective view illustrating a vehicle 12 equipped with a temperature raising device 10 (see FIG. 2) and a vehicle battery 11 according to the present embodiment. FIG. 1(B) is a plan view for explaining the arrangement state of the temperature raising device 10 and the vehicle-mounted battery 11 of the present embodiment. FIG. 2 is a block diagram illustrating the temperature raising device 10 of this embodiment. FIG. 3A is a side view for explaining the heater 16 of the temperature raising device 10 of this embodiment. FIG. 3B is a cross-sectional view for explaining the temperature raising heater 16 of the temperature raising device 10 of the present embodiment, and is a cross-sectional view of the temperature raising heater 16 taken along the line AA shown in FIG. 3A. . FIG. 3(C) is a cross-sectional view for explaining the temperature raising heater 16 of the temperature raising device 10 of the present embodiment, and is a cross-sectional view of the temperature raising heater 16 in the BB line direction shown in FIG. 3(A). .

As shown in FIG. 1(A), a vehicle 12 such as an automobile or a train is equipped with an on-vehicle battery 11 (see FIG. 1(B)) for supplying electric power to a motor and various electrical components. When the vehicle 12 is an automobile, EV (Electrical Vehicle) vehicles, HEV (Hybrid Electrical Vehicle) vehicles, PHEV (Plug-in Hybrid Electrical Vehicle) vehicles, and the like have become popular in recent years. These vehicles 12 are also equipped with a plurality of in-vehicle batteries 11 having a high power storage function.

FIG. 1A shows a state in which a vehicle 12 equipped with an in-vehicle battery 11 is viewed from below. The vehicle 12 includes a vehicle body 13, a plurality of vehicle batteries 11 arranged in a battery arrangement area 15 near the bottom surface 14 of the vehicle 12, and a drive motor 25 (Fig. 2) and tires (not shown) that are rotated by the drive force of the drive motor 25 .

As shown in FIG. 1B, a plurality of onboard batteries 11 are arranged in a matrix in a battery arrangement area 15 of a vehicle 12 . The in-vehicle battery 11 has, for example, a rectangular parallelepiped shape, and its longitudinal direction is arranged along the front-rear direction of the vehicle 12 . By efficiently arranging a plurality of vehicle batteries 11 in the battery arrangement area 15 and mounting a large number of vehicle batteries 11, the continuous running distance of the vehicle 12 can be increased.

As shown, the heater 16 of the temperature raising device 10 (see FIG. 2) is arranged along the longitudinal side surfaces 11A and 11B (see FIG. 5B) of the vehicle battery 11. As shown in FIG. The temperature raising heater 16 is arranged so as to sandwich the vehicle battery 11 and heats the vehicle battery 11 from both side surfaces 11A and 11B of the vehicle battery 11 . When the vehicle 12 travels in a low-temperature environment such as a cold region, the heater 16 raises the temperature of the vehicle-mounted battery 11 to a usable temperature range, thereby improving output characteristics, discharge/charge characteristics, and the like. Degradation of battery characteristics is prevented.

Specifically, in the battery arrangement area 15 of the vehicle 12, two vehicle-mounted batteries 11 are arranged in the front row, and three temperature-raising heaters 16 are arranged in close contact with the vehicle-mounted batteries 11. are arranged. On the other hand, from the second row to the fourth row, four vehicle-mounted batteries 11 are arranged in each row, and five temperature raising heaters 16 are arranged in close contact with the vehicle-mounted batteries 11. there is Although the details will be described later, the temperature raising heater 16 is disposed in close contact with at least a part of the periphery of the outer peripheral end portions of the side surfaces 11A and 11B of the vehicle battery 11, and the closed spaces 51 and 52 (see FIG. 5). (B)), it is possible to efficiently raise the temperature of the vehicle-mounted battery 11 .

As shown in FIG. 2, the temperature raising device 10 mainly includes an electronic control unit 21, a temperature raising heater 16 for warming the vehicle battery 11, a temperature sensor 22 for measuring the temperature of the vehicle battery 11, and a temperature raising heater. and a sub-battery 23 that supplies power to 16 .

The vehicle battery 11 is, for example, a 350V high voltage power supply source. Vehicle-mounted battery 11 is connected to drive motor 25 via inverter 24 and supplies power to drive motor 25 . The drive motor 25 outputs power for driving drive wheels (not shown) of the vehicle 12 (see FIG. 1A).

The electronic control unit 21 includes a CPU (Central Processing Unit), a ROM (Read Only Memory), a RAM (Random Access Memory), etc., and executes various calculations for vehicle control. The electronic control unit 21 is started by, for example, pressing the ignition switch 26 of the vehicle 12 while the driver steps on the brake (not shown).

The electronic control unit 21 stores, for example, the measured value from the temperature sensor 22 and compares it with the lower limit value for turning on the temperature raising heater 16 . When the measured value is equal to or less than the lower limit value, the electronic control unit 21 supplies electric power from the sub-battery 23 to the heater 16 to turn on the heater 16 . On the other hand, after the heater 16 is turned on, the measured value from the temperature sensor 22 is stored and compared with the upper limit value at which the heater 16 is turned off. When the measured value is equal to or greater than the upper limit value, the electronic control unit 21 stops the power supply from the sub-battery 23 to the heater 16 and turns off the heater 16 .

For example, if the vehicle 12 is parked in a low temperature environment such as a cold region and the temperature of the vehicle battery 11 is below the lower limit of the usable temperature range when the vehicle 12 is started, the vehicle battery 11 operates. Otherwise, the internal resistance of the vehicle-mounted battery 11 may increase, and the battery characteristics such as output characteristics and discharge/charge characteristics may deteriorate. Therefore, the electronic control unit 21 monitors the temperature of the vehicle-mounted battery 11 via the temperature sensor 22 and controls the temperature of the vehicle-mounted battery 11 via the heater 16 so that the temperature of the vehicle battery 11 falls within the usable temperature range. .

As shown in FIG. 3A, the temperature raising heater 16 mainly includes a housing portion 31, a heating wire 32 incorporated in the housing portion 31, and a nonwoven fabric 33 supporting the heating wire 32. ing. The heating wire 32 is supported by being sewn on the surface of the nonwoven fabric 33, and generates heat when electric power is supplied from the sub-battery 23 (see FIG. 2). The nonwoven fabric 33 is made of, for example, glass fiber having excellent thermal conductivity, and is arranged on substantially the entire side surfaces 31A and 31B of the housing portion 31 . The nonwoven fabric 33 can support the heating wire 32 and efficiently transfer the heat generated from the heating wire 32 to the surrounding air layer.

As shown in the figure, the housing portion 31 is, for example, a substantially plate-like body, and side surfaces 31A and 31B located on the sides of the housing portion 31 have a longitudinal direction along the longitudinal direction of the vehicle 12 and extend vertically along the vehicle 12 . It has a short direction along the direction. As described above with reference to FIG. 1B, the housing 31 is arranged along the side surfaces 11A and 11B of the vehicle-mounted battery 11 . The width W1 in the longitudinal direction of the housing portion 31 is substantially the same as the width W3 in the longitudinal direction of the vehicle battery 11 (see FIG. 4A), and the width W2 in the lateral direction of the housing portion 31 is , and the width W4 (see FIG. 4A) of the vehicle battery 11 in the lateral direction.

With this structure, the temperature raising heater 16 is not arranged to protrude to the outside of the vehicle-mounted battery 11 in the longitudinal direction of the vehicle 12 . Then, as many vehicle batteries 11 as possible are efficiently arranged in the battery arrangement area 15 of the vehicle 12, as shown in FIG. 1(B). Similarly, the temperature raising heater 16 is not arranged to protrude to the outside of the vehicle-mounted battery 11 in the vertical direction of the vehicle 12 . Also in the structure in which the on-vehicle batteries 11 are arranged in layers, as many on-vehicle batteries 11 as possible are arranged efficiently.

In particular, when the vehicle 12 is an EV vehicle, an HEV vehicle, or a PHEV vehicle, in order to increase the continuous running distance, many vehicle-mounted batteries are placed in the limited battery arrangement area 15 (see FIG. 1B) of the vehicle 12. It is desirable to mount the battery 11 . At that time, by realizing the shape of the heater 16 described above, the vehicle 12 is equipped with as many on-vehicle batteries 11 as possible.

As shown in FIGS. 3(A) to 3(C), side surfaces 31A and 31B of the casing 31 are formed with annular protrusions 31C and 31D along the outer peripheral edges thereof. Concave portions 34 and 35 are formed inside the projecting portions 31C and 31D on the side surfaces 31A and 31B of the housing portion 31, respectively. Although the details will be described later, in a state in which the heater 16 is arranged in close contact with the side surfaces 11A and 11B of the vehicle battery 11 (see FIG. 5B), the concave portions 34 and 35 are located on the vehicle battery 11. Sealed spaces 51 and 52 (see FIG. 5B) are formed between the side surfaces 11A and 11B and the side surfaces 31A and 31B of the housing portion 31 .

As described above, the housing portion 31 incorporates the heating wire 32 and the nonwoven fabric 33 . The heating wire 32 is sewn, for example, on the surface of the nonwoven fabric 33 on the side surface 31B side of the housing portion 31 . The heating wire 32 generates heat by being supplied with electric power from the sub-battery 23 (see FIG. 2), and heats the air in the recesses 34 and 35 using the nonwoven fabric 33 having excellent thermal conductivity. . Incidentally, the heating wire 32 may be sewn on both sides of the nonwoven fabric 33 .

At this time, as indicated by the dashed line in FIG. 3A, the heating wire 32 is denser on the lower side than on the upper side with respect to the vertical direction of the side surfaces 31A and 31B (the vertical direction of the vehicle 12). are wired so that Specifically, the heating wire 32 is wired to extend in the longitudinal direction of the side surfaces 31A and 31B (the longitudinal direction of the vehicle 12) on the lower side of the side surfaces 31A and 31B. The heating wire 32 is wired while being bent in a rectangular shape in the lateral direction (vertical direction of the vehicle 12).

On the other hand, the heating wire 32 is wired to extend in the longitudinal direction of the side surfaces 31A and 31B (the longitudinal direction of the vehicle 12) on the upper side of the side surfaces 31A and 31B. The heating wire 32 is wired to the vicinity of the upper end side of the side surfaces 31A and 31B at both ends in the longitudinal direction, and is wired while bending to the vicinity of the heating wire 32 positioned below in the region between them. .

With this structure, in the temperature raising heater 16 , the heat generation density of the heating wire 32 is high in the region from the center to the lower end side of the housing portion 31 . On the other hand, in the area from the center to the upper end side of the housing part 31, there are many areas where the heating wire 32 is not wired, and the heat generation density is low. Although the details will be described later, the recesses 34 and 35 become sealed spaces 51 and 52 (see FIG. 5B), and the air in the sealed spaces 51 and 52 convects vertically due to rising air currents, so that the sealed space 51 , 52 is warmed. As a result, the wiring length of the heating wire 32 on the upper side of the temperature raising heater 16 can be reduced, and the power consumption of the temperature raising heater 16 can be reduced.

The wiring pattern of the heating wire 32 is not limited to the shape shown in FIG. 3(A). It is sufficient that the heating wires 32 are arranged more densely on the side surfaces 31A and 31B on the lower side than on the upper side. For example, the angular shape shown in FIG. 3A may be curved. . Alternatively, the heating wire 32 on the upper side of the side surfaces 31A and 31B may be wired in the vicinity of the upper end in a straight line without approaching the heating wire 32 on the lower side.

Here, the vehicle-mounted battery 11 of this embodiment will be described with reference to FIGS. 4(A) and 4(B). FIG. 4A is a perspective view illustrating the vehicle battery 11 of this embodiment. FIG. 4B is an exploded perspective view illustrating the vehicle battery 11 of this embodiment.

As shown in FIG. 4A, the vehicle-mounted battery 11 mainly includes a storage case 41, a plurality of battery cells 42 (see FIG. 4B) stored in the storage case 41, and storage case 41. A cover 43 covering the upper surface, a temperature control plate 44 (see FIG. 4B) arranged below the storage case 41, and a heat insulating member 45 arranged below the temperature control plate 44 (see FIG. 4B). )) and have

The in-vehicle battery 11 has, for example, a substantially rectangular parallelepiped shape. A hand direction is provided. As described above, the width W3 in the longitudinal direction of the side surfaces 11A and 11B is substantially the same as the width W1 in the longitudinal direction of the side surfaces 31A and 31B of the housing portion 31 (see FIG. 3A). is substantially the same as the width W2 of the side surfaces 31A and 31B of the housing portion 31 in the lateral direction.

As shown in FIG. 4B, the storage case 41 is mainly composed of a pair of end plates 46 and a pair of bind bars 47, and a plurality of battery cells 42 can be stored from the front, rear, left and right. surround and support. The end plates 46 are made of, for example, plate-shaped resin or steel plates, and are members that cover the front and rear side surfaces of the battery cells 42 positioned at both ends. The bind bar 47 is made of, for example, plate-shaped resin or steel plate, and is a member that covers the right and left side surfaces of the plurality of battery cells 42 . The cover 43 is made of, for example, a plate-shaped resin or steel plate, and is a member that covers the battery cell 42 from above.

The battery cell 42 is, for example, a secondary battery such as a nickel-metal hydride battery or a lithium-ion battery. Each battery cell 42 has, for example, a rectangular flat plate shape, and is arranged at equal intervals along the front-rear direction of the vehicle 12 with small gaps in front and rear of the battery cells 42 . A plurality of battery cells 42 are connected in series via a conductive connection plate (not shown) to form a high-power vehicle battery 11 . Although not shown, a positive electrode terminal and a negative electrode terminal are provided on the upper surface of the battery cell 42 so as to protrude upward.

The temperature control plate 44 is temperature control means arranged near the lower surfaces of the plurality of battery cells 42 . A pipe (not shown) through which a medium such as water flows is arranged inside the temperature control plate 44 . By arranging the temperature control plate 44 below the plurality of battery cells 42 , battery characteristics such as charge/discharge characteristics of the battery cells 42 are improved.

Specifically, when the temperature of the battery cell 42 is higher than the usable temperature range, the cooling medium flows through the temperature control plate 44 to cool the battery cell 42 and adjust the temperature of the battery cell 42 . On the other hand, when the temperature of the battery cell 42 is lower than the usable temperature range, the heating medium flows through the temperature control plate 44 to raise the temperature of the battery cell 42 and adjust the temperature of the battery cell 42 .

As described with reference to FIG. 1B, the heater 16 is arranged along the side surfaces 11A and 11B of the vehicle battery 11 so that the temperature control plate 44 can can be arranged along the Then, the temperature of the vehicle battery 11 can be raised from three directions by using the temperature raising heater 16 and the temperature control plate 44 . On the other hand, the vehicle battery 11 can also be cooled using the temperature control plate 44 .

The heat insulating member 45 is a plate-like member arranged below the temperature control plate 44, and is made of foamed synthetic resin such as foamed polyethylene. By arranging the heat insulating member 45 below the temperature control plate 44 , the temperature control plate 44 can be insulated from the outside, and the temperature control effect of the temperature control plate 44 can be increased.

Next, the arrangement state of the temperature raising heater 16 of the temperature raising device 10 of this embodiment will be described with reference to FIGS. 5(A) and 5(B). FIG. 5A is a perspective view for explaining the arrangement state of the temperature raising heater 16 of the temperature raising device 10 of this embodiment. FIG. 5(B) is a cross-sectional view for explaining an arrangement state of the temperature raising heater 16 of the temperature raising device 10 of the present embodiment. It is a diagram.

FIG. 5(A) shows two vehicle-mounted batteries 11 and three temperature raising heaters 16 arranged in the front row of the battery arrangement area 15 of the vehicle 12 shown in FIG. 1(B). The heaters 16 are arranged on the side surfaces 11A and 11B of the vehicle battery 11 so as to sandwich the vehicle battery 11 therebetween. A heater 16 is provided between the two vehicle batteries 11 to heat the two vehicle batteries 11 at the same time.

As shown in the figure, the upper surface 31E of the housing 31 and the upper surface 11C of the vehicle battery 11 are substantially flush with each other, and both end surfaces 31F of the housing 31 and the vehicle battery 11 are aligned in the front-rear direction of the vehicle 12. are substantially flush with the end faces 11D of the . As described above, the housing portion 31 of the heater 16 does not protrude from the upper surface 11C and the end surface 11D of the vehicle battery 11, so that more vehicle batteries 11 can be attached to the vehicle 12. It can be installed efficiently.

As described with reference to FIGS. 3A to 3C, the side surfaces 31A and 31B of the casing 31 of the heater 16 are provided with annular projections 31C along the outer peripheral edges thereof. , 31D are formed.

Then, as shown in FIG. 5(B), the temperature raising heater 16 is placed so that the tip surfaces of the protruding portions 31C and 31D are in close contact with the periphery of the outer peripheral end portions of the side surfaces 11A and 11B of the battery 11 for use in the vehicle. are arranged with respect to the vehicle-mounted battery 11 . The temperature raising heater 16 is arranged without a gap in appearance from the vehicle-mounted battery 11, but sealed spaces 51 and 52 (see FIG. 5B) are formed inside. there is

As illustrated, sealed spaces 51 and 52 are formed between the side surfaces 11A and 11B of the vehicle battery 11 and the side surfaces 31A and 31B of the housing portion 31 using the concave portions 34 and 35 of the housing portion 31. It is Although not shown, the side surfaces 11A and 11B at both ends of the vehicle battery 11 in the left-right direction of the vehicle 12 are also different from the side surface 11A of the vehicle battery 11 on the right side. A closed space 52 is formed using the , and a closed space 51 is formed using the concave portion 35 of the housing portion 31 with respect to the side surface 11B of the vehicle battery 11 on the left side.

Air exists in the closed spaces 51 and 52 and is heated through the heating wire 32 and the nonwoven fabric 33 . As described with reference to FIG. 3A, the heating wires 32 are wired with respect to the side surfaces 31A and 31B of the casing 31 so that the lower side is denser than the upper side. In the temperature raising heater 16, the heat generation density of the heating wire 32 is increased in the region from the center to the lower end side of the housing portion 31. As shown in FIG.

With this structure, the air in the closed spaces 51 and 52 is warmed from below, an ascending current is generated in the closed spaces 51 and 52, and the warmed air convects vertically in the closed spaces 51 and 52. As a result, the temperature inside the closed spaces 51 and 52 rises as uniformly as possible. Then, the warmed air in the sealed spaces 51 and 52 intervenes as a heat conduction path to warm the storage case 41 of the vehicle battery 11, thereby increasing the temperature inside the vehicle battery 11 and increasing the temperature of the vehicle battery 11. of battery cells 42 are warmed. As a result, in the vehicle-mounted battery 11, deterioration of battery characteristics such as output characteristics and discharge/charge characteristics is prevented.

On the other hand, the air intervening as a heat conduction path stays in the closed spaces 51 and 52, so that the temperature can be easily maintained after reaching a certain temperature. As a result, by adjusting the amount of power supplied from the sub-battery 23 (see FIG. 2) to the heating wire 32, the power consumption of the temperature raising heater 16 can be reduced. As described above, the power consumption of the heater 16 can also be reduced by devising the wiring pattern of the heating wire 32 .

Moreover, as shown in the figure, the heating wire 32 and the nonwoven fabric 33 are built in the housing portion 31 . The heater 16 operates mainly when the vehicle 12 travels in a low-temperature environment such as a cold district. Condensation occurs on the battery 11 and the casing 31 of the heater 16 . At this time, since the heating wire 32 is covered and protected by the housing portion 31, the heating wire 32 is not exposed to dew condensation, and the temperature raising heater 16 is prevented from leaking. Also, the heating wire 32 is prevented from being corroded by dew condensation and broken.

In this embodiment, the side surfaces 31A and 31B of the casing 31 are formed with annular projecting portions 31C and 31D along the outer peripheral edges thereof, and the tip surfaces of the projecting portions 31C and 31D correspond to the vehicle battery. Although the case where the outer periphery of the side surfaces 11A and 11B of 11 are in close contact with each other has been described, the present invention is not limited to this case. For example, the housing portion 31 is made of a plate-like body with a certain thickness, and a sealing member having a certain thickness is attached along the outer peripheral edge to the side surfaces 31A and 31B of the housing portion 31. A structure in which the recesses 34 and 35 are formed inside the . Also in this structure, when the temperature raising heater 16 is arranged on the side surfaces 11A and 11B of the vehicle battery 11, the tip surface of the seal member is positioned around the outer peripheral edge of the side surfaces 11A and 11B of the vehicle battery 11. Sealed spaces 51 and 52 are formed between the side surfaces 11A and 11B of the vehicle battery 11 and the side surfaces 31A and 31B of the housing 31, and the same effects as those described above can be obtained. In addition, various modifications are possible without departing from the gist of the present invention.

REFERENCE SIGNS LIST 10 temperature raising device 11 vehicle battery 11A, 11B side surface 11C upper surface 11D end surface 12 vehicle 15 battery placement area 16 temperature raising heater 21 electronic control unit 22 temperature sensor 23 sub-battery 25 drive motor 31 casing 31A, 31B side surface 31C, 31D Projection 31E Upper surface 31F End surface 32 Heating wire 33 Nonwoven fabric 34, 35 Recess 41 Storage case 42 Battery cell 44 Temperature control plate 51, 52 Closed space

Claims (6)

A temperature raising device for an on-vehicle battery having a temperature raising heater arranged along a longitudinal side surface of the on-vehicle battery housing a plurality of battery cells,
The temperature raising heater is
a housing;
and a heating wire arranged in the housing,
The side surface of the housing facing the side surface of the vehicle battery is provided with a close contact area that is in close contact with at least the periphery of the outer peripheral edge of the side surface of the vehicle battery,
The close-contact area is an annular protruding portion from which a part of the side surface of the housing portion protrudes,
The projecting portion is in close contact with the side surface of the vehicle-mounted battery, is inside the projecting portion, and forms a sealed space between the side surface of the vehicle-mounted battery and the side surface of the casing. A vehicle battery temperature raising device characterized by: A warming device for an on-vehicle battery having a temperature raising heater arranged along a longitudinal side surface of the on-vehicle battery housing a plurality of battery cells,
The temperature raising heater is
a housing;
and a heating wire arranged in the housing,
The side surface of the housing facing the side surface of the vehicle battery is provided with a close contact area that is in close contact with at least the periphery of the outer peripheral edge of the side surface of the vehicle battery,
The close contact area is an annular seal member attached to the side surface of the housing,
The sealing member is in close contact with the side surface of the vehicle-mounted battery, is inside the sealing member, and forms a sealed space between the side surface of the vehicle-mounted battery and the side surface of the casing. A vehicle battery temperature raising device characterized by: The upper surface of the casing part is flush with the upper surface of the battery for vehicle use, and the end surfaces on both longitudinal end sides of the casing part are aligned with the end surfaces on both ends in the longitudinal direction of the battery for vehicle use. 3. The vehicle battery temperature raising device according to claim 1 or 2 , wherein the temperature riser is one. The heating wire is arranged along the side surface of the housing,
The heating wire positioned on the lower side of the side surface of the housing is wired more densely than the heating wire positioned on the upper side of the side surface of the housing. 4. The device for increasing the temperature of a vehicle-mounted battery according to any one of claims 1 to 3 . the heating wire positioned on the lower side of the side surface of the housing portion is wired while being curved or angularly bent in the lateral direction of the side surface of the housing portion;
The heating wire positioned on the upper side in the side surface of the housing part is positioned on the lower side in the side surface of the housing part at least in a central region in the longitudinal direction of the side surface of the housing part. 5. The device for raising the temperature of a vehicle-mounted battery according to claim 4 , wherein the heating wire is wired close to the heating wire. 6. The heating device for a vehicle-mounted battery according to claim 1, wherein a temperature control plate is arranged on the lower surface of the vehicle-mounted battery.

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