JP7064704B2 - 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 is formed by winding a positive electrode foil and a negative electrode foil via a separator, and a storage body of a square storage battery is composed of a plurality of winding bodies and housed in a case. Depending on the connection mode, the storage battery for EV and the storage battery for hybrid vehicles are made separately. 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 plurality of winding bodies, 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 plurality of winding bodies.

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 power 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 faces the flat surfaces of the plurality of flat wound bodies. In the winding body, the positive electrode foil and the negative electrode foil are wound flat around the horizontal axis via a separator, the outer periphery is covered with an insulating member, and a pair of the flat surface portions thereof. The heater is arranged so as to abut the wound body at a position that does not match when viewed from the flat surface portion side, and the heat pipe is a flat surface portion that is brought close to the surface portion at a position that does not abut on the heater. It is characterized by having a heat absorbing portion that abuts on the heat absorbing portion and a heat radiating 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.

According to the above configuration, the storage battery has a plurality of flat wound bodies constituting the storage body in the case, and the influence of the outside temperature is reduced by the heat insulating member covering the outer periphery of the storage body. Heaters are arranged on the pair of flat surfaces of the winding body so as to be in contact with each other at positions that do not match when viewed from the flat surface portion side, and the winding body is heated from the pair of flat surface portions. Further, the heat absorbing portion of the heat pipe arranged so as not to abut on the heater abuts on the flat portion where the winding bodies are close to each other in a facing manner, and the heat absorbing portion absorbs the heat of the two adjacent winding bodies. The heat is transferred to the case by moving it to the heat radiating part that abuts on the inner wall of the case on the outside of the heat insulating member. Therefore, each winding body of the power storage body is heated from a pair of flat surface portions and is endothermic from the flat surface portions facing the adjacent winding bodies, so that the storage body of the storage battery constituting the vehicle power storage device is heated and cooled. Can be performed uniformly.

The invention of claim 2 is characterized in that, in the invention of claim 1, the endothermic portion abuts on the pair of the flat surface portions of all the winding bodies constituting the storage body.
According to the above configuration, in all the winding bodies constituting the power storage body, the heat absorbing portions of the heat pipes are in contact with the pair of flat surfaces, and heat is absorbed from the pair of flat surfaces. It is possible to perform more uniform cooling of the storage body of the storage battery constituting the above.

The invention of claim 3 is characterized in that, in the invention of claim 1 or 2, a plurality of the storage batteries are arranged at a predetermined interval to have a cooling air passage formed between the storage batteries.
According to the above configuration, the heat of the storage body moved to the case by the heat pipe can be 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 the power storage body of the storage battery constituting the vehicle power storage device.

It is a block diagram explaining the structure of the vehicle which concerns on embodiment of this invention. It is a main part perspective view 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 side view of the power storage body of FIG. 5 as viewed from the horizontal axis direction. It is a side view which looked at the winding body from the horizontal axis direction. FIG. 5 is a plan view of the power storage body of FIG. 5 as viewed from above. It is a perspective view which shows an example of a heat pipe. It is a perspective view which shows the other example of a heat pipe.

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 8.
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 power storage body 25 has a plurality of winding bodies 30, and although the storage body 25 having three winding bodies 30 will be described below, it may have three or more winding bodies 30.

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 power storage body 25 is configured such that the flat surface portions 30d of the three flat winding bodies 30 are brought close to each other so as to face each other, and the winding bodies 30 are arranged in a row in the horizontal direction. When the winding body 30 is viewed from the flat surface portion 30d side, the heater 28 abuts on the pair of flat surface portions 30d of each winding body 30 at positions where they may partially overlap but do not match. The area of the heater 28 is smaller than that of the flat surface portion 30d, and is about half of that of the flat surface portion 30d. The heater 28 between the two adjacent winding bodies 30 is shared by the two winding bodies 30 to reduce the number of heaters 28. When the power storage body 25 is viewed from above, for example, the heater 28 is in contact with a pair of flat surface portions 30d of each winding body 30 at positions shifted alternately.

The positive electrode current collecting tab 33 connected to the positive electrode foil 30a of the three 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 three 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 three 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.

The heat pipe 27 transfers the heat of the storage body 25 to the case 22. The endothermic portion 27a of the heat pipe 27 abuts on the flat surface portion 30d where the two adjacent winding bodies 30 of the storage body 25 face each other so as not to abut on the heater 28. The endothermic portion 27a between the two adjacent winding bodies 30 absorbs heat from the two winding bodies 30.

The heat pipe 27 extends from the heat absorbing portion 27a that abuts on the flat surface portion 30d 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 outer side of the heat insulating member 26, and the inner wall of the case 22 (the inner wall of the first side surface portion 22b, the second). It has a heat radiating portion 27b that abuts on the inner wall of the 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 sealed inside 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 30 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 to 9, the heat pipe 27 is a heat insulating member 26 above and below the two endothermic portions 27a, which each abut against the opposed flat surface portions 30d between the three winding bodies 30. It extends to the outside of the heat insulating member 26 and is integrally formed so as to be connected to the two heat radiating portions 27b on the outside of the heat insulating member 26.

Further, as shown in FIG. 10, two heat absorbing portions 37a abutting on a flat surface portion 30d between the two winding bodies 30 and adjacent to each other and a flat surface portion 30d between the winding body 30 and the heat insulating member 26. It is also possible to dispose two heat pipes 37 formed so as to extend horizontally from the heat insulating member 26 to the outside of the heat insulating member 26 and to be connected to the heat radiating portion 37b on the outside of the heat insulating member 26. Since each winding body 30 is endothermic from a pair of flat surface portions 30d, it can be cooled more uniformly. The two heat pipes 37 may be integrally formed. Further, although the description is omitted, it is also possible to appropriately form a heat pipe according to the number of winding bodies 30 to cool the storage body 25.

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.

Similarly, since the heater 28 is also in close contact with the flat surface portion 30d, the heat of the heater 28 is smoothly transferred to the wound body 30 in contact with the heater 28. 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 detects 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 storage battery 20 has a plurality of (for example, three) flat winding bodies 30 constituting the storage body 25 in the case 22, and the influence of the outside temperature is reduced by the heat insulating member 26 covering the outer periphery of the storage body 25. To. Heaters 28 are arranged on the pair of flat surface portions 30d of the winding body 30 so as to be in contact with each other at positions that do not match when viewed from the flat surface portion 30d side, and warm the winding body from the pair of flat surface portions 30d. Further, the endothermic portion 27a of the heat pipe 27 arranged so as not to abut on the heater 28 abuts on the flat surface portion 30d in which the two winding bodies 30 are close to each other in a facing manner, and the two winding bodies 30 are close to each other. The heat of the heat absorbing portion 27a is absorbed by the heat absorbing portion 27a and transferred to the heat radiating portion 27b in contact with the inner walls of the first and second side surface portions 22b and 22c of the case 22 on the outside of the heat insulating member 26 to transfer the heat to the case 22.

Therefore, each winding body 30 of the power storage body 25 is heated from the pair of flat surface portions 30d and is endothermic from the flat surface portions 30d facing the adjacent winding bodies 30, so that the storage body of the storage battery 20 constituting the power storage device 10 The heating and cooling of 25 can be performed uniformly.

Further, with respect to all the winding bodies 30 constituting the storage body 25, the heater 28 and the heat absorbing portion 27a of the heat pipe 27 are brought into contact with the pair of flat surface portions 30d to store electricity in the storage battery 20 constituting the power storage device 10. The body 25 can be cooled more uniformly.

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. 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 12: Support panel member 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: Power storage body 26: Insulation member 27, 37: Heat pipe 27a, 37a: Endothermic part 27b, 37b: Heat dissipation part 28: Heater 30: Winding body 30d: Flat part

Claims (3)

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 of
The storage body of the storage battery is configured such that the flat surfaces of a plurality of flat wound bodies are close to each other in a facing manner.
In the winding body, the positive electrode foil and the negative electrode foil are wound flat around the horizontal axis via the separator, the outer circumference is covered with an insulating member, and the winding body is placed on the pair of flat surfaces. The heater is arranged so as to abut at positions that do not match when viewed from the flat surface side.
The heat pipe has a heat absorbing portion that abuts on a flat surface portion that is close to the heater at a position that does not abut on the heater, 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. A vehicle power storage device characterized by being equipped with. The vehicle power storage device according to claim 1, wherein the endothermic parts are in contact with the pair of flat surfaces of all the winding bodies constituting the power storage body. The vehicle power storage device according to claim 1 or 2, wherein a plurality of the storage batteries are arranged at predetermined intervals and have a cooling air passage formed between the storage batteries.

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