JP7064703B2 - Vehicle power storage device - Google Patents

Description

The present invention relates to a vehicle power storage device mounted on a vehicle.

Conventionally, a hybrid vehicle in which a drive wheel is driven by an engine and an electric motor to travel has been widely used. A hybrid vehicle has an engine and an electric motor mounted in the limited space of the vehicle and runs mainly on the engine. Therefore, the scene of driving the electric motor is limited, and a small storage device having a small storage capacity is adopted as a power storage device for driving and traveling the electric motor.

On the other hand, there is increasing interest in electric vehicles (EVs) that do not emit carbon dioxide or the like while driving. The EV is equipped with an electric motor and a power storage device that stores the power to drive and run the electric motor, and has a storage capacity larger than that of a hybrid vehicle in order to extend the travelable distance with one charge. Has been adopted. The power storage device also supplies electric power for operating electrical components such as braking devices, steering devices, headlights, and air conditioners.

A power storage device for a hybrid vehicle or an EV is composed of a plurality of storage batteries. As the storage battery, for example, a square lithium-ion secondary battery is used in which a positive and negative electrode foil and an electrolytic solution are hermetically housed in a rectangular case made of an aluminum alloy. A plurality of square lithium-ion secondary batteries connected in series constitute a power storage device having a high output voltage for driving an electric motor. In the EV power storage device, a plurality of lithium ion secondary batteries are connected in parallel and in series to realize a large storage capacity and a high output voltage.

The lithium-ion secondary battery constituting the power storage device has an operating temperature range in which the excellent performance can be exhibited, and charging / discharging outside the operating temperature range may not only not exhibit the performance but also promote deterioration. Therefore, it is necessary to make the storage battery less susceptible to the influence when the outside air temperature is low, and it is necessary to heat the storage battery so that the temperature does not become lower than the lower limit temperature in the operating temperature range when it is cold. Further, since the storage battery generates heat during charging and discharging, it is necessary to cool the storage battery so as not to exceed the upper limit temperature in the operating temperature range.

As a technique for heating a power storage device, for example, as in Patent Document 1, a technique for heating by a heater arranged on the bottom side of an aggregate of square storage batteries is known. Further, as in Patent Document 2, there is known a technique of arranging a sheet-shaped heater between laminated storage batteries in which positive electrode foils and negative electrode foils are alternately stacked and sealed with an insulating film via a separator. On the other hand, as a cooling technique for a power storage device, a technique is known in which cooling air is circulated around the storage battery by a blower fan or the like to promote heat dissipation from the surface of the storage battery.

When heating a power storage device composed of a square storage battery, as in Patent Document 1, the heater is arranged so as to be close to or in contact with the case, and the Joule heat of the heater generated by energization is transmitted to the case to transfer the storage battery. Since it is heated, it is difficult to efficiently heat the electrode foil as in Patent Document 2. Specifically, since there is a heat capacity of a case or the like other than the electrode foil, the heat of the heater is used for other than heating the positive and negative electrode foils.

Further, in order to prevent the heat of the heater from escaping and to reduce the influence of the outside air temperature, it is conceivable to cover the storage battery with a heat insulating member together with the heater. It is difficult to heat evenly. On the other hand, cooling of the storage battery promotes heat dissipation from the surface of the storage battery case by the cooling air, so if the storage battery is covered with a heat insulating member together with the heater, heat dissipation is hindered and cooling cannot be performed.

Therefore, in the case, a power storage body for storing electric power, a heat insulating member covering the outer periphery of the power storage body, a sheet-shaped heater for heating the power storage body, and a sheet-like sheet for transferring the heat of the storage body to the case. The present applicant has already proposed a vehicle power storage device having a square storage battery equipped with the heat pipe of the above (Japanese Patent Application No. 2018-81169, etc.).

Japanese Unexamined Patent Publication No. 2008-103207 Japanese Patent No. 56099799

As described above, the EV storage device is required to have a high output voltage and a large storage capacity. The power storage device of a hybrid vehicle is required to have a high output voltage similar to that of an EV power storage device, but has a smaller storage capacity than that of an EV power storage device. At present, the manufacturing cost of a storage battery is not low, so the storage battery used for the power storage device of an EV and the storage battery used for the power storage device of a hybrid vehicle are shared to some extent to reduce the manufacturing cost.

For example, a winding body in which a positive electrode foil and a negative electrode foil are wound via a separator is formed, and a storage body of a square storage battery is composed of at least one set of winding body pairs composed of a pair of winding bodies. It is housed in a case, and is divided into a storage battery for EV and a storage battery for hybrid vehicles according to the connection mode of these plurality of winding bodies. By connecting a plurality of winding bodies in parallel, it is possible to form a storage battery for an EV having a large storage capacity. Further, by connecting a plurality of winding bodies in series, a storage battery for a hybrid vehicle having a high output voltage can be formed.

Even in a square storage battery having a storage body composed of such a winding body pair, it is necessary to adjust the storage body to an appropriate temperature by heating and cooling. However, since a member for insulation is arranged between the winding bodies in the vicinity, it is difficult to transfer heat between the winding bodies, and all the winding bodies of the power storage body can be uniformly heated and cooled. I didn't.

An object of the present invention is to provide a vehicle power storage device including a storage battery capable of uniformly heating and cooling a power storage body composed of a winding body pair.

The invention according to claim 1 is an electric storage body that stores electric power in a rectangular case, a heat insulating member that covers the outer periphery of the electric storage body, a sheet-shaped heater for heating the electric storage body, and heat of the electric storage body. In a vehicle storage device having a plurality of storage batteries provided with a sheet-shaped heat pipe for moving the storage battery, the storage body of the storage battery is at least one set consisting of a pair of flat wound bodies. The winding body has a winding body pair in which a positive electrode foil and a negative electrode foil are wound flat around a horizontal axis via a separator and the outer periphery is covered with an insulating member. The heat absorbing pipe is configured to have the flat surfaces of the winding body close to each other so as to face each other, and the heat pipe has a heat absorbing portion that abuts on the facing flat surface portion of the winding body pair inside the heat insulating member, and the heat absorbing portion. The heater is provided with a heat radiating portion extending from the portion to the outside of the heat insulating member and abutting on the inner wall of the case, and the heater is a flat surface portion on the inside of the heat insulating member on the side where the heat absorbing portion of the winding body pair is not in contact. It is characterized in that it is arranged so as to be in contact with each other.

According to the above configuration, the vehicle power storage device has a plurality of storage batteries, and the storage battery has at least one pair of wound bodies constituting the power storage body in the case, and is outside by a heat insulating member covering the outer periphery of the power storage body. The effect of temperature is reduced. The heat absorbing part of the heat pipe that abuts on the opposite flat surface of the winding body pair can absorb heat from the winding body pair and move it to the heat radiating part, and the heat radiating part transfers heat to the case to promote heat dissipation. can. Further, the heater is arranged so as to sandwich the winding body pair in the flat surface portion on the side where the heat absorbing portion of the heat pipe is not in contact, and the winding body pair can be uniformly heated from the wide flat surface portion. Therefore, it is possible to uniformly heat and cool the power storage body composed of the winding body pair of the plurality of storage batteries constituting the vehicle power storage device.

The invention according to claim 2 is a storage body that stores electric power in a rectangular case, a heat insulating member that covers the outer periphery of the power storage body, a sheet-shaped heater for heating the power storage body, and heat of the power storage body. In a vehicle storage device having a plurality of storage batteries provided with a sheet-shaped heat pipe for moving the storage battery, the storage body of the storage battery is at least one set consisting of a pair of flat wound bodies. The winding body has a winding body pair in which a positive electrode foil and a negative electrode foil are wound flat around a horizontal axis via a separator and the outer periphery is covered with an insulating member. The heaters are arranged so as to be in contact with the facing flat surfaces of the winding body pair inside the heat insulating member. The heat pipe has a heat absorbing portion disposed inside the heat insulating member so as to abut on a flat surface portion on the side where the heater of the winding body pair does not abut, and an outer side of the heat insulating member from the heat absorbing portion. It is characterized by having a heat radiating portion that extends to the inner wall of the case and abuts on the inner wall of the case.

According to the above configuration, the vehicle power storage device has a plurality of storage batteries, and the storage battery has at least one pair of winding bodies constituting the power storage body in the case, and the storage battery has a heat insulating member covering the outer periphery of the storage body. The effect of outside temperature is reduced. The heater is arranged so as to abut on the opposing flat surface portions of the winding body pair, and the winding body pair can be uniformly heated from the wide flat surface portion. Further, the heat absorbing portion of the heat pipe is arranged so as to sandwich the winding body pair on the flat surface portion on the side where the heater is not in contact, and the heat of the winding body pair is absorbed from the flat surface portion where the heat absorbing portion is in contact with each other. The heat can be moved to the heat dissipation unit, and the heat dissipation unit can transfer heat to the case to promote heat dissipation. Therefore, it is possible to uniformly heat and cool the power storage body composed of the winding body pair of the plurality of storage batteries constituting the vehicle power storage device.

The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, the heat pipe is arranged for each winding body pair.
According to the above configuration, the capacity or output voltage of the storage battery can be easily increased by increasing the number of winding body pairs constituting the storage battery.

The invention of claim 4 has a cooling air passage formed between the storage batteries by arranging a plurality of the storage batteries at a predetermined interval in the invention of any one of claims 1 to 3. It is characterized by.
According to the above configuration, the heat of the winding body pair moved to the case by the heat pipe is dissipated to the outside by the cooling air flowing through the cooling air passage from the side surface of the case facing the cooling air passage. Therefore, it is possible to promote heat dissipation of the vehicle power storage device and cool it.

According to the vehicle power storage device of the present invention, it is possible to uniformly heat and cool a storage battery having a power storage body composed of a winding body pair.

It is a block diagram explaining the structure of the vehicle which concerns on embodiment of this invention. It is an exploded perspective view of the main part of the power storage device which concerns on embodiment of this invention. It is an exploded perspective view of the main part of the power storage module which concerns on embodiment of this invention. FIG. 3 is a sectional view taken along line IV-IV of FIG. It is an exploded perspective view of the main part of the storage battery which concerns on embodiment of this invention. FIG. 5 is a sectional view taken along line VI-VI showing an example of the power storage body of FIG. It is a figure explaining the winding body of FIG. It is a perspective view of the heat pipe of FIG. FIG. 5 is a sectional view taken along line IX-IX showing another example of the storage body of FIG. It is a perspective view of the heat pipe of FIG.

Hereinafter, embodiments for carrying out the present invention will be described with reference to examples.

An example of a large-capacity vehicle power storage device that supplies electric power for driving an EV will be described.
As shown in FIG. 1, the EV is a vehicle-side load 1, an electric motor 2 for driving a vehicle, a braking device 3, various sensors including a vehicle speed sensor 4, a temperature sensor 5, a cooling fan 6, and DC power supplied to these. It is equipped with a DCDC converter 7 or the like that adjusts the voltage of the above. It also includes a power storage device 10 (vehicle power storage device) that stores electric power for driving a vehicle to be supplied to the vehicle side load 1, and a control unit (ECU 8) that controls the vehicle side load 1 and the power storage device 10.

The temperature sensor 5 detects the temperature of the power storage device 10. The cooling fan 6 blows cooling air for cooling the power storage device 10. The ECU 8 is composed of a computer including a CPU, a memory for storing various programs, an input / output device, and the like. The ECU 8 processes signals periodically output from various sensors, and outputs control signals for appropriately operating the power storage device 10, the electric motor 2, the braking device 3, the cooling fan 6, and the like. The ECU 8 manages the charging state (SOC) of the power storage device 10 and notifies the driver of the current SOC, the mileage, and the like. The power storage device 10 is charged by the electric power supplied from the external power source when parked, and is also charged by the electric power generated by rotating the electric motor 2 by the rotational force of the wheels by the regenerative brake.

Next, the power storage device 10 will be described.
As shown in FIG. 2, the power storage device 10 includes a support panel member 12 and a cover in order to secure vibration resistance (rigidity) and water resistance (waterproofness) for disposing in the space below the vehicle interior floor panel of the EV. It is housed in a power storage device case made of the member 13. In the figure, the arrow U indicates upward, the arrow F indicates the front of the vehicle, and the arrow L indicates the left side of the vehicle. The heat generated from the power storage device 10 is stored by the cooling air introduced into the power storage device case from the front side along the support panel member 12 by operating a cooling fan 6 (not shown) and discharged to the rear. It is discharged to the outside of the device case. The temperature sensor 5 detects the temperature of the power storage device 10 and outputs temperature data to the ECU 8, and the ECU 8 adjusts the amount of air blown by the cooling fan 6 in order to prevent an excessive temperature rise of the power storage device 10.

The power storage device 10 is configured to connect a plurality of (for example, 16) power storage modules 11 in series by a plurality of bus bars 14 to supply electric power for driving an EV vehicle. The number of power storage modules 11 constituting the power storage device 10 is appropriately set according to the specifications of the EV on which the power storage device 10 is mounted.

Next, the power storage module 11 will be described.
As shown in FIG. 3, the power storage module 11 includes a plurality of (for example, 6) storage batteries 20. A pair of support members 15 and a pair of end plates 16 are connected so as to maintain a state in which the plurality of storage batteries 20 are aligned horizontally in a row at predetermined intervals (for example, at intervals of 10 mm). It is fixed. The power storage module 11 can be composed of a number of storage batteries 20 according to a required output voltage or the like.

The pair of support members 15 are equipped with a plurality of spacer members 15a for maintaining a predetermined distance between the storage batteries 20 to secure a cooling air passage 17. Further, a cooling air passage 17 is also provided between the end plate 16 and the storage battery 20. The plurality of storage batteries 20 are connected in series by a plurality of bus bars 18, and are provided with positive electrode terminals 11a and negative electrode terminals 11b of the power storage module 11 at both ends thereof. As shown in FIG. 4, between the storage battery 20 of the power storage module 11 and the support panel member 12, a passage 19 for supplying cooling air to each cooling air passage 17 is provided.

Next, the storage battery 20 will be described with reference to FIGS. 5 to 7.
The storage battery 20 has a rectangular parallelepiped case 22, and a positive electrode terminal 23 and a negative electrode terminal 24 of the storage battery 20 are arranged on an upper surface portion 22a which is a lid member. The case 22 has a first side surface portion 22b and a second side surface portion 22c facing the cooling air passage 17, and a third side surface portion 22d orthogonal to and parallel to the first and second side surface portions 22b and 22c. It also has a fourth side surface portion 22e and a bottom surface portion 22f facing the upper surface portion 22a, and the inner walls thereof are insulated.

The case 22 contains a power storage body 25, a heat insulating member 26 that covers the outer peripheral portion of the power storage body 25, a sheet-shaped heat pipe 27, a sheet-shaped heater 28, and an electrolytic solution (not shown), and a lid. It is sealed with a member. The storage body 25 has at least one set of winding body pairs 32 composed of a pair of winding bodies 30, and is composed of, for example, two sets of winding body pairs 32. The storage body 25 may be composed of three or more sets or one set of winding body pairs 32.

In the winding body 30, the positive electrode foil 30a and the negative electrode foil 30b are wound flat around the horizontal axis via a porous sheet-shaped separator (not shown), and the outer periphery thereof is covered with an insulating member 31. It is configured and includes a pair of flat surfaces 30d. The insulating member 31 is formed in a flexible sheet shape by a synthetic resin material (for example, polypropylene or polyethylene), and is a bag-shaped accommodating portion for accommodating the heater 28 that abuts on the flat surface portion 30d of the winding body 30. (Not shown).

The winding body pair 32 is configured such that the flat surface portions 30d of the pair of flat winding bodies 30 are close to each other in a facing manner. In the storage body 25 composed of two sets of winding body pairs 32, one of the non-facing outer flat surface portions 30d of the winding body pair 32 faces the outer flat surface portion 30d of the other winding body pair 32. The four winding bodies 30 are arranged in a row in the horizontal direction so as to be close to each other.

The positive electrode current collecting tab 33 connected to the positive electrode foil 30a of the four winding bodies 30 of the storage body 25 is arranged on the third side surface portion 22d side and connected to the positive electrode terminal 23 of the storage battery 20, and the four winding bodies 30 A negative electrode current collecting tab 34 connected to the negative electrode foil 30b is arranged on the fourth side surface portion 22e side and is connected to the negative electrode terminal 24 of the storage battery 20. That is, a storage body 25 in which four winding bodies 30 are connected in parallel is housed in the case 22, and a storage battery 20 having a large storage capacity for EV is formed. The winding body 30 constituting the power storage body 25 is connected in series, the positive electrode current collecting tab 33 is connected to the positive electrode foil 30a at the positive electrode side end of the series connection, and the negative electrode collection is connected to the negative electrode foil 30b at the negative electrode side end. By connecting the electric tab 34, for example, a storage battery 20 having a high output voltage for a hybrid vehicle can be formed.

At least the majority region of the outer peripheral portion of the power storage body 25 is covered with a sheet-shaped heat insulating member 26. The heat insulating member 26 is formed, for example, by forming a silica airgel-based hollow structure into a flexible sheet shape so that the hollow structure is closed to the outside. The heat insulating member 26 has a higher effect of suppressing heat conduction between the winding body 30 and the case 22 than the insulating member 31, and has insulating properties without infiltration of the electrolytic solution.

Each winding body pair 32 of the power storage body 25 is provided with a sheet-shaped heat pipe 27 for transferring the heat of the winding body pair 32 to the case 22, and a sheet-shaped heater 28 for heating the winding body 30 from the flat surface portion 30d. It is set up. The heater 28 is housed in the accommodating portion of the insulating member 31 on the flat surface portion 30d on the side where the heat absorbing portion 27a of the heat pipe 27 is in contact with the facing flat surface portion 30d of the winding body pair 32 and the heat absorbing portion 27a is not in contact with the flat portion 30d. It is in contact with it. In other words, the endothermic portion 27a is sandwiched between the opposite flat surface portions 30d of the pair of winding bodies 30, and the heater is placed on the outer flat surface portion 30d so as to sandwich the pair of winding bodies 30, that is, the winding body pair 32. 28 is arranged. The heater 28 of the flat surface portion 30d in which the winding body pairs 32 are close to each other shares the heater 28 equipped in one of the winding body pairs 32 to reduce the number of heaters 28, but each winding is performed. It may be equipped on the rotating body pair 32.

The heat pipe 27 extends from the heat absorbing portion 27a that abuts on the flat surface portion 30d of the winding body pair 32 inside the heat insulating member 26 that covers the power storage body 25 to the outside of the heat insulating member 26, and extends to the outside of the heat insulating member 26, and the inner wall (first side surface portion) of the case 22. It has a heat radiating portion 27b that abuts on the 22b or the inner wall of the second side surface portion 22c). The heat pipe 27 can be easily bent, and although not shown, a wick that causes a capillary phenomenon of the hydraulic fluid and the hydraulic fluid is enclosed in the heat pipe 27, and a passage for the vaporized hydraulic fluid is formed. The surface of the heat pipe 27 is covered with an insulating protective film for protection from the electrolytic solution.

The hydraulic fluid absorbed and vaporized from the winding body 30 in the endothermic unit 27a moves to the heat radiating unit 27b whose air pressure is lower than that of the endothermic unit 27a. The hydraulic fluid that radiates heat, condenses, and liquefies in the heat radiating unit 27b travels through the wick and returns to the endothermic unit 27a due to the capillary phenomenon. The circulation of the hydraulic fluid transfers the heat of the winding body pair 32 to the outside of the heat insulating member 26, and the storage body 25 is cooled.

In order for the heat pipe 27 to function, a sufficiently large heat dissipation area is secured with respect to the area of the endothermic portion 27a. The area of the heat radiating portion 27b is preferably 10 times or more the area of the endothermic portion 27a. The heat radiating portion 27b may be brought into contact with the bottom surface portion 22f of the case 22 to further increase the heat radiating area, and the cooling air passing near the lower side of the bottom surface portion 22f may also be used to promote heat radiating.

The heat pipe 27 can be configured in various forms so as to have the area ratio of the heat absorbing portion 27a and the heat radiating portion 27b. For example, as shown in FIGS. 6 and 8, the heat pipe 27 extends from the heat absorbing portion 27a abutting on the flat surface portion 30d to the outside of the heat insulating member 26 below, and is connected to the heat radiating portion 27b on the outside of the heat insulating member 26. .. And each winding body pair 32 has a heat pipe 27. Therefore, it is easy to increase the number of winding body pairs 32 constituting the storage battery 20 to increase the storage capacity or the output voltage. When the power storage body 25 is composed of three or more sets of winding body pairs 32, the heat radiating portions 27b of each winding body pair 32 are appropriately arranged on the bottom surface portion 22f and the like so as not to overlap each other.

Further, the heat pipe 27 may extend horizontally from the heat absorbing portion 27a to the outside of the heat insulating member 26 and be connected to the heat radiating portion 27b. For example, as shown in FIGS. 9 and 10, the heater 28 accommodated in the accommodating portion of the insulating member 31 abuts on the opposite flat surface portion 30d of the wound body pair 32, and the flat surface portion on the side where the heater 28 does not abut. The heat absorbing portion 37a of the heat pipe 37A or 37B comes into contact with 30d. In other words, the heater 28 is sandwiched between the opposite flat surface portions 30d of the pair of winding bodies 30, and the heat pipe is formed on the outer flat surface portion 30d so as to sandwich the pair of winding bodies 30, that is, the winding body pair 32. The endothermic portion 37a of the 37A or the heat pipe 37B is arranged. As a result, the number of heaters 28 of the storage battery 20 can be reduced, and the heat absorbing portions 37a of the heat pipes 37A and 37B are arranged so as not to overlap the flat surface portions 30d in which the winding body pairs 32 are close to each other. This promotes heat absorption in the flat surface portion 30d in which the winding body pairs 32 are close to each other.

The heat pipes 37A and 37B extend horizontally from a pair of heat absorbing portions 37a abutting on the flat surface portion 30d to the outside of the heat insulating member 26 and are connected to the heat radiating portion 37b on the outside of the heat insulating member 26. The two sets of winding body pairs 32 each have a heat pipe 37A or a heat pipe 37B. Similarly, when the storage body 25 is composed of three or more winding body pairs 32, the heat absorbing portion of the heat pipe of each winding body pair 32 does not overlap with the flat surface portion 30d in which the winding body pairs 32 are close to each other. It is also arranged appropriately on the bottom surface portion 22f or the like so that the heat radiating portions of the heat pipes of the winding body pair 32 do not overlap with each other.

The endothermic portion 27a (37a) is wound by the action of the force of the storage body 25 housed in the case 22 and pressing the side surface portions (first side surface portion 22b, second side surface portion 22c) and the reaction force from the side surface portion. The heat radiating portion 27b (37b) is in close contact with the flat surface portion 30d of the rotating body 30 and is in close contact with the inner wall of the first side surface portion 22b or the second side surface portion 22c of the case 22. Therefore, the heat of the winding body 30 is smoothly absorbed from the flat surface portion 30d to which the heat absorbing portion 27a (37a) is in close contact, and to the first side surface portion 22b and the second side surface portion 22c to which the heat radiating portion 27b (37b) is in close contact. Smooth heat dissipation (heat transfer). Since the heat absorbing portion 27a (37a) is in close contact with each winding body 30, heat is uniformly absorbed from each winding body 30.

Further, since the heater 28 is also in close contact with the flat surface portion 30d to which the endothermic portion 27a (37a) is not in contact, the heat of the heater 28 is smoothly transmitted to the winding body 30. The heater 28 is configured to generate Joule heat when energized. Then, a temperature switch 29 is switched so that the power line 28a of each heater 28 is energized at a temperature lower than the predetermined temperature so as to heat the battery 20 using the electric power of the storage battery 20 at a temperature lower than the predetermined temperature, for example, as shown in FIG. It is connected to the positive electrode terminal 23 via the power line 28b, and is connected to the negative electrode terminal 24. Although not shown, the heater 28, which is sandwiched and sealed by an insulating film made of synthetic resin, is sandwiched between the flat surface portions 30d of the winding bodies 30 which are close to each other in a facing manner, or is sandwiched between the flat surface portions 30d and the heat insulating member 26. It can also be pinched.

The temperature switch 29 detects the temperature of the upper surface portion 22a or the temperature inside the case 22 as the temperature of the storage battery 20, and energizes when the detected temperature is less than a predetermined temperature. As a result, the storage battery 20 operates the heater 28 by the electric power stored in the storage body 25 to maintain a predetermined temperature. The predetermined temperature is, for example, −20 ° C., and is appropriately set according to the specifications of the storage battery 20 (lower limit value in the operating temperature range).

The resistance value of the heater 28 is set so that the storage body 25 covered with the heat insulating member 26 can maintain a predetermined temperature by the self-heating of the storage battery 20 that supplies the Joule heat and the electric power when the heater 28 is operated. .. Since the amount of heat radiation and the like differ depending on the specifications of the storage battery 20, this resistance value is appropriately set according to the specifications and the like of the storage battery 20. As a result, the power consumption of the heater 28 is minimized and the decrease in SOC is moderated.

Based on the temperature data of the temperature sensor 5, the ECU 8 controls cooling by the cooling fan 6 so that the power storage device 10 can exhibit its performance within a predetermined operating temperature range. For example, when the temperature sensor 5 detects a temperature equal to or higher than the upper limit temperature of the operating temperature range (for example, 60 ° C.) or is predicted to exceed the upper limit temperature from the degree of increase in the detected temperature, the ECU 8 determines the upper limit of the operating temperature range. The air volume of the cooling fan 6 is adjusted so as to maintain a temperature lower than the temperature. As a result, the heat transferred to the case 22 of each storage battery 20 is discharged to the outside by the cooling air, and the power storage device 10 is cooled so as not to exceed the upper limit temperature of the operating temperature range.

Next, the operation and effect of the present invention will be described.
The power storage device 10 has a plurality of storage batteries 20, and the storage battery 20 has at least one set of winding body pairs 32 constituting the power storage body 25 in the case 22, and is insulated by a heat insulating member 26 that covers the outer periphery of the power storage body 25. The influence of the temperature outside the member 26 is reduced. Further, the heater 28 arranged in the winding body pair 32 inside the heat insulating member 26 can heat the winding body pair 32 from the wide flat surface portion 30d, and the heat of the heater 28 is not dissipated by the heat insulating member 26. ing. Further, when the storage body 25 becomes hot due to charging / discharging, the heat of the winding body pair 32 is transferred to the first side surface portion 22b and the second side surface portion 22c of the case 22 by the heat pipes 27 (37A, 37B). It can be discharged to the outside by cooling air. Therefore, the storage body 25 composed of the winding body pair 32 of the plurality of storage batteries 20 constituting the power storage device 10 can be uniformly heated and cooled.

Further, since the heat pipes 27 (37A, 37B) are arranged for each winding body pair 32, the number of winding body pairs 32 constituting the storage battery 20 can be easily increased, and the storage capacity or output of the storage battery 20 can be easily increased. The voltage can be easily increased.

Further, it has a cooling air passage 17 formed between the storage batteries 20 by arranging a plurality of storage batteries 20 at predetermined intervals. Therefore, the heat of the power storage body 25 transferred to the case 22 by the heat pipe 27 is circulated through the cooling air passage 17 from the side surface portions (first and second side surface portions 22b, 22c) of the case 22 facing the cooling air passage 17. Since the heat can be dissipated to the outside by the cooling air, the heat dissipation of the power storage device 10 can be promoted and cooled.

The power storage body 25 may be configured by arranging the winding bodies 30 in a row in the vertical direction. It is also possible to equip each winding body 30 with a heat pipe provided with a heat absorbing portion that abuts on the flat surface portion 30d of each winding body 30. In addition, a person skilled in the art can carry out the embodiment in which various modifications are added to the above embodiment without departing from the spirit of the present invention, and the present invention also includes such modifications.

2: Electric motor 5: Temperature sensor 6: Cooling fan 8: ECU
10: Power storage device 11: Power storage module 15: Support member 16: End plate 17: Cooling air passage 20: Storage battery 22: Case 22b: First side surface portion 22c: Second side surface portion 23: Positive electrode terminal 24: Negative electrode terminal 25: Storage Body 26: Insulation member 27, 27A, 27B: Heat pipe 27a: Heat absorption part 27b: Heat dissipation part 28: Heater 29: Temperature switch 30: Winding body 30a: Positive electrode foil 30b: Negative electrode foil 30d: Flat part 31: Insulation member 32 : Winding body pair 33: Positive electrode current collecting tab 34: Negative electrode current collecting tab

Claims (4)

A storage body that stores power in a rectangular case, a heat insulating member that covers the outer periphery of the power storage body, a sheet-shaped heater for heating the power storage body, and a sheet-shaped heater for transferring the heat of the power storage body to the case. In a vehicle power storage device having a plurality of storage batteries equipped with a sheet-shaped heat pipe
The storage body of the storage battery has at least one pair of winding bodies consisting of a pair of flat winding bodies.
In the wound body, the positive electrode foil and the negative electrode foil are wound flat around the horizontal axis through the separator, and the outer circumference is covered with an insulating member.
The winding body pair is configured such that the plane portions of the winding body are close to each other in a facing manner.
The heat pipe has a heat absorbing portion that abuts on the opposite flat surface portion of the winding body pair inside the heat insulating member, and a heat absorbing portion that extends from the heat absorbing portion to the outside of the heat insulating member and abuts on the inner wall of the case. Equipped with
The heater is a vehicle power storage device, characterized in that the heater is arranged inside the heat insulating member so as to be in contact with a flat surface portion on the side where the endothermic portion of the winding body pair is not in contact with each other. A storage body that stores power in a rectangular case, a heat insulating member that covers the outer periphery of the power storage body, a sheet-shaped heater for heating the power storage body, and a sheet-shaped heater for transferring the heat of the power storage body to the case. In a vehicle power storage device having a plurality of storage batteries equipped with a sheet-shaped heat pipe
The storage body of the storage battery has at least one pair of winding bodies consisting of a pair of flat winding bodies.
In the wound body, the positive electrode foil and the negative electrode foil are wound flat around the horizontal axis through the separator, and the outer circumference is covered with an insulating member.
The winding body pair is configured such that the plane portions of the winding body are close to each other in a facing manner.
The heater is arranged inside the heat insulating member so as to abut on the facing flat surface portion of the winding body pair.
The heat pipe is provided with a heat absorbing portion disposed inside the heat insulating member so as to abut on a flat surface portion on the side where the heater of the winding body pair is not in contact, and from the heat absorbing portion to the heat insulating member. A vehicle power storage device including a heat radiating portion that extends outward and abuts on the inner wall of the case. The vehicle power storage device according to claim 1 or 2, wherein the heat pipe is arranged for each winding body pair. The vehicle power storage device according to any one of claims 1 to 3, wherein a plurality of the storage batteries are arranged at a predetermined interval to have a cooling air passage formed between the storage batteries. ..

Images