JP6096027B2 - Battery system for vehicle and electric vehicle equipped with battery system - Google Patents

Description

  The present invention relates to a battery system used for a power source of a motor for driving a vehicle such as a hybrid car, a plug-in hybrid car, and an electric vehicle, and an electric vehicle including the battery system. The present invention relates to a battery system that is housed in a battery and forcibly cooled by a cooling plate and an electric vehicle including the battery system.

  A battery system of high power mounted on a vehicle such as a hybrid car or an electric vehicle has a large charge / discharge current and is used under various external conditions, so that the temperature of the battery may increase. An increase in battery temperature not only lowers the electrical characteristics of the battery, but also shortens the life of the battery and further hinders safety. Therefore, it is necessary to cool the battery as the temperature increases. In order to cool the battery whose temperature has risen, a battery system that cools the battery with a cooling plate has been developed. (See Patent Document 1)

  When the battery unit is forcibly cooled by the cooling plate, moisture in the air condenses on the cooling plate and the battery unit and adheres to the surface. This is because the amount of moisture that can be contained in the state of water vapor in the air varies depending on the temperature, and the moisture content decreases as the temperature decreases. When the cooling plate is cooled and the surface temperature is lowered, the temperature of the air in contact with the surface is lowered, and moisture is supersaturated and condensation occurs. Therefore, the amount of condensed water generated increases in a state where the outside air temperature is high and the relative humidity is high. Since the vehicle travels under various external conditions with different temperatures and humidity, considerable condensed water may be generated depending on the use environment. Condensed water causes electric leakage, electric shock, discharge of the battery unit, particularly unbalanced discharge of the battery unit.

  In order to prevent the harmful effects of condensed water, the battery system of Patent Document 1 in which the battery unit is mounted on the cooling surface of the cooling plate for cooling is arranged along the periphery of the battery unit on the cooling surface of the cooling plate. A water catching section that is in communication with the water guideway is provided. In this battery system, the dew condensation water generated when the battery unit is forcibly cooled by the cooling plate is collected in the water guide path, and the dew condensation water collected in the water guide path is captured by the water capturing unit.

JP 2012-94376 A

  The above battery system can reduce electric leakage due to condensed water. However, when the amount of condensed water increases, this causes the battery unit to leak. In particular, as described in Patent Document 1, a cooling plate that supplies a liquefied refrigerant and forcibly cools it with the heat of vaporization of the refrigerant has a significantly low surface temperature and can efficiently cool the battery unit. Since the temperature is low, condensation tends to occur, and the amount of condensed water generated increases, so that it is difficult to reliably prevent harmful effects such as leakage due to condensed water.

  Furthermore, since the battery system described in Patent Document 1 circulates the refrigerant in the cooling plate and forcibly cools it with the heat of vaporization of the refrigerant, there is a disadvantage that the cooling system is complicated and the cost of the parts is increased. This is because the cooling system supplies liquid refrigerant pressurized to a considerably high pressure of about 2 MPa by the compressor to the cooling plate. Therefore, the compressor that pressurizes the refrigerant and the heat that cools and liquefies the pressurized refrigerant. This is because a condenser of the exchanger and an expansion valve for adiabatically expanding the refrigerant liquefied by the condenser are required. In addition, since this cooling system supplies high-pressure refrigerant to the cooling plate, it is necessary to make the connection portion of the cooling plate and its piping so that the high-pressure refrigerant does not leak, and there is a drawback that assembly is troublesome. . Therefore, the battery system of Patent Document 1 has a drawback that the cooling system is complicated and the component cost and the manufacturing cost are increased.

  In order to prevent the above-described adverse effects, the present inventor has developed a battery system in which the battery unit is housed in a watertight outer case and the cooling plate is cooled by circulating cooling water instead of the refrigerant. In this battery system, the outer case can be made a sealed structure so that outside air does not enter. Furthermore, since the cooling plate is cooled by the cooling water regardless of the heat of vaporization of the refrigerant, the cooling plate is not cooled to an abnormally low temperature. For this reason, the condensation on the surface of the cooling plate can be remarkably reduced. In addition, since it is not necessary to supply pressurized refrigerant to the cooling plate, the cooling plate structure and piping connection can be simplified to reduce both component cost and assembly cost.

  However, in the battery system described above, when the cooling water leaks into the outer case and the bottom of the battery unit is immersed in the cooling water, a short current flows to electrolyze the cooling water and generate hydrogen gas. There are harmful effects. In particular, in a battery system mounted on a vehicle, when the vehicle accelerates, decelerates with a brake, or turns to the left and right and acceleration is applied in the horizontal direction, the acceleration acting on the outer case by the combined vector with the gravitational acceleration. Is shifted from the vertical direction in which the gravitational acceleration is applied to the horizontal direction, and the outer case is in the same state as the inclined posture, that is, substantially inclined as shown in FIG. The leakage R of the cooling water accumulated at the bottom is unevenly distributed to one side, and the maximum liquid level (Hp) of the leakage R is increased. In this state, the leaked liquid R that leaks and accumulates at the bottom is more easily short-circuited at the bottom of the battery unit 102. When the leaked liquid R short-circuits the battery unit 102, the short-circuit current is larger than the leakage of dew condensation water, causing a harmful effect on the battery unit 102, and the large short-circuit current causing a harmful effect such as the generation of hydrogen gas. Become.

The present invention has been developed for the purpose of solving the above-mentioned drawbacks. An important object of the present invention is to provide a vehicle battery system capable of effectively preventing harmful effects caused by dew condensation water and leakage of cooling water circulating in the cooling plate while having a simple structure, and an electric motor equipped with the battery system. To provide a vehicle.
Another important object of the present invention is to provide a battery system which can reduce the cost of parts and manufacturing, can be mass-produced at low cost, and can reliably prevent harmful effects caused by leakage of condensed water and cooling water over a long period of time. It is to provide.

Means for Solving the Problems and Effects of the Invention

The battery system according to the present invention includes an outer case 9, a battery unit 2 composed of a plurality of unit cells 1 housed in the outer case 9, and a battery unit 2 that is arranged in a thermally coupled state and that cools the coolant. The cooling plate 3 is connected to the mechanism 35 and is cooled by the cooling liquid circulated from the cooling mechanism 35 to the inside. In this battery system, a liquid reservoir 22 for cooling liquid is provided at the bottom of the outer case 9 and provided with a partition wall 21 for lowering the maximum liquid level below the battery unit 2 in a substantially inclined posture of the outer case 9. The leakage liquid R of the coolant circulated through the cooling plate 3 is caused to flow into the liquid reservoir 22.
In this specification, the “substantially inclined posture of the outer case” means not only a state in which the outer case is actually inclined to be in an inclined posture, but also a state in which the outer case is not actually inclined. It is used in a broad sense, including the fact that the inertial force acts on the object in the outer case due to the inertia of the vehicle, so that the outer case is in a state equivalent to the actual inclination.

  The battery system described above is characterized by being able to effectively prevent harmful effects caused by condensed water and leakage due to leakage of cooling liquid circulating in the cooling plate while having an extremely simple structure. Furthermore, the above battery system accelerates by depressing the accelerator of the vehicle, decelerates by depressing the brake, further turns the steering wheel and turns left or right, or runs on a road on which the vehicle tilts or leans on both sides. Even when the acceleration acts in the direction and the outer case is substantially inclined, the battery unit can be effectively prevented from being short-circuited by condensed water or leaked coolant. This is because the battery system described above provides a liquid reservoir with a partition wall that lowers the maximum liquid level in a substantially inclined posture at the bottom of the outer case, and stores the leaked coolant in the liquid reservoir.

In the battery system of the present invention, the partition wall 21 is provided as an upper and lower wall 21A provided on the bottom surface 9A of the outer case 9 so as to extend in the vertical direction. It can be set as the structure which provides the part 22. FIG.
This battery system has a feature that the maximum liquid level can be lowered in a substantially inclined posture of the outer case while the liquid reservoir portion has a simpler structure.

In the above battery system, the partition walls 21 are provided as the upper and lower walls 21A provided in a plurality of rows on the bottom surface 9A of the outer case 9, and the liquid reservoir 22 is provided at the bottom of the outer case 9 on the side of the upper and lower walls 21A. Can do.
The battery system described above is characterized in that the maximum liquid level can be lowered and the maximum liquid level can be lowered in a substantially inclined posture of the outer case.

In the battery system of the present invention, the cooling plate 3 has a connection end 31A connected to the cooling mechanism 35 via the coolant pipe 33, and a plurality of cooling plates 3 are arranged in the outer case 9, and each cooling plate 3 The coolant pipe 33 is connected to the connection end 31 </ b> A, and the coolant pipe 33 and the connection end 32 </ b> A between the coolant pipe 33 and the connection end 31 </ b> A are located inside the outer case 9. It can be set as the position to which it flows.
In the battery system described above, a plurality of cooling plates are arranged in the outer case, and the coolant that leaks from the connecting portion between these cooling plates and the coolant pipe can be surely flowed into the liquid reservoir.

In the battery system described above, the coupling portion 32 between the coolant pipe 33 and the coupling end 31A is disposed at the center of the exterior case 9, and the partition wall 21 including a pair of upper and lower walls 21A is disposed at the center of the exterior case 9. A liquid reservoir 22 is provided between the upper and lower walls 21 </ b> A, and the connecting portion 32 is disposed above the liquid reservoir 22.
In this battery system, the coolant leaked from the connecting portion can be stored in the liquid reservoir provided between the pair of upper and lower walls, and the maximum liquid level can be lowered.

In the battery system of the present invention, the cooling plate 3 includes a connection end 31 </ b> A connected to the cooling mechanism 35 via the coolant pipe 33, and includes a flange 24 connected to the liquid reservoir 22. The slant 24 is inclined downward toward the liquid reservoir 22 and the spear 24 is disposed below the connecting portion 32 between the coolant pipe 33 and the connecting end 31A. The liquid can be made to flow into the liquid reservoir 22 through 24.
In the battery system described above, the coolant leaking from the connecting portion can be collected with a scoop and flowed into the liquid reservoir, so there is no restriction on the position of the liquid reservoir, and the liquid reservoir can be provided at a specific position. There is a feature that the volume of the reservoir can be increased.

In the battery system according to the present invention, the partition wall 21 is separated from the bottom plate 9A of the outer case 9 upward, and is formed as a lid plate 21B provided with a part of the opening 21b, and a liquid reservoir is provided between the lid plate 21B and the bottom plate 9A. A portion 22 can be provided.
Since this liquid reservoir has a structure in which the upper surface is closed by a partition wall, there is a feature that the maximum liquid level can be lowered more effectively. In particular, there is a feature that can reliably prevent the vehicle from vibrating and the maximum liquid level from becoming high.

The battery system of the present invention is provided with partition walls 23 extending vertically or horizontally along the central portion of the outer case 9, and the lid plates 21B are arranged on both sides of the partition walls 23 so that the openings of the lid plates 21B are opened. As a position where the portion 21b is closer to the partition wall 23 side than the center portion, the liquid reservoirs 22 can be provided on both sides of the partition wall 23 with each lid plate 21B.
This battery system has a feature that even when the vehicle travels and assumes a substantially inclined posture, the leaked coolant can be stored in the liquid reservoirs provided on both sides of the partition wall, and the maximum liquid level can be lowered.

In the battery system of the present invention, a recess 17 is provided in the bottom plate 9A of the outer case 9, a partition wall 21 of the lid plate 21B is disposed in the opening of the recess 17, and a liquid reservoir 22 is provided below the partition wall 21 of the lid plate 21B. Can be provided.
This battery system can more reliably prevent various harmful effects caused by the leaked coolant by lowering the maximum liquid level.

In the battery system of the present invention, the coolant pipe 33 is inserted into the connection end 31A, the O-ring 34 is disposed between the connection end 31A and the coolant pipe 33, and the coolant pipe 33 is connected to the connection end 31A in a watertight structure. be able to.
This battery system has a simple structure and can connect the coolant pipe to the connection end in a watertight manner.

The battery system of the present invention includes a fuse 41 connected to the battery unit 2 and a direct current, and an output connector 40 connected to the output side of the battery unit 2 via the fuse 41 and fixed to the outer case 9 with a waterproof structure. The output connector 40 is disposed in the liquid reservoir 22, the output connector 40 is immersed in the coolant flowing into the liquid reservoir 22, the output side of the battery unit 2 is short-circuited, and the fuse 41 is connected. It can be set as the structure fuse | melted with the electric power of the battery unit 2. FIG.
This battery system has a feature that, when the coolant leaks and is stored in the liquid reservoir, the fuse connected in series with the battery unit is blown, so that it can be used more safely.

  The battery system according to the present invention includes an outer case 9, a battery unit 2 composed of a plurality of unit cells 1 housed in the outer case 9, a heat coupled state to the battery unit 2, and a coolant inside. The cooling plate 3 is circulated, the plate portion 30 of the cooling plate 3 is disposed in the outer case 9, and the connecting end 31A protrudes. Further, the connecting end 31A is provided in the outer case. A projection that is inserted into a through-hole 9a provided in the housing 9 and protrudes to the outside of the exterior case 9 is used as an external connection portion 29. A coolant pipe 33 is connected to the external connection portion 29, and the plate portion 30 and the exterior case are further connected. 9 between the inner surface, the packing 18 is arranged around the through-hole 9a, the connection end 31A and the connection portion 32 of the coolant pipe 33 are arranged outside the outer case 9, Between the periphery and the plate portion 30 of the instrumentation case 9 the inner surface of the through-hole 9a can be structured for connecting the waterproof structure packing 18.

  The battery system described above is characterized by being able to effectively prevent harmful effects caused by condensed water and leakage due to leakage of cooling liquid circulating in the cooling plate while having an extremely simple structure. Furthermore, in the battery system described above, the connecting portion through which the coolant leaks is disposed outside the outer case, so that it is possible to reliably prevent the coolant from leaking into the outer case. For this reason, this battery system accelerates by stepping on the accelerator of the vehicle, decelerates by stepping on the brake, turns further to the left and right by operating the steering wheel, or runs on the road where the vehicle slopes or leans on both sides. Even when the acceleration acts in the direction and the outer case is substantially inclined, the coolant does not leak into the outer case, and the battery unit can be reliably prevented from being short-circuited by the leaked liquid. .

In the battery system of the present invention, a plurality of cooling plates 3 can be arranged in the outer case 9, and the external connection portion 29 of each cooling plate 3 can be connected to the coolant pipe 33 outside the outer case 9. .
This battery system can surely prevent the harmful effects caused by the leaked coolant while effectively cooling the plurality of battery units with the plurality of cooling plates.

The battery system of the present invention has a structure in which the coolant pipe 33 is inserted and connected to the external connection portion 29, and a packing 34 is disposed between the coolant pipe 33 and the external connection portion 29 so that the connection end 31A and the coolant are connected. The pipe 33 can be connected to the waterproof structure.
This battery system has a feature that the coolant pipe can be connected to the connection end in a simple, easy and reliable manner so as not to leak liquid.

The battery system of the present invention can seal the outer case 9 in a watertight structure.
The battery system described above has a feature that can effectively prevent the generation of condensed water while having a very simple structure. This is because the battery system accommodates the battery unit in a watertight outer case to prevent the outside air from entering the outer case and the moisture contained in the outside air from condensing. Furthermore, the battery system described above realizes the feature that the parts cost and the manufacturing cost can be reduced, the mass production can be performed at a low cost, and the harmful effects caused by the dew condensation water can be reliably prevented over a long period of time. This is because the battery system described above houses the battery unit in a watertight outer case, prevents the outside air from entering the outer case, and cools the cooling plate with the coolant regardless of the heat of vaporization of the refrigerant. . Since the cooling liquid circulated through the cooling plate can have a lower pressure than the refrigerant, the cooling plate can have a simple structure, and the connecting portion for supplying the cooling liquid can be easily connected as a simple structure.

  The electric vehicle of the present invention includes any one of the battery systems 90 described above, and travels by supplying electric power from the battery system 90 to a motor 93 that causes the vehicle to travel.

1 is a schematic horizontal sectional view of a battery system according to an embodiment of the present invention. It is the II-II sectional view taken on the line of the battery system shown in FIG. It is the III-III sectional view taken on the line of the battery system shown in FIG. It is a schematic exploded perspective view which shows the laminated structure of the battery unit and cooling plate of the battery system shown in FIG. It is a perspective view which shows an example of a battery unit. It is a disassembled perspective view of the battery unit shown in FIG. It is a perspective view which shows an example of a cooling plate. FIG. 8 is a vertical cross-sectional view of the cooling plate shown in FIG. 7. It is an expanded sectional view which shows the connection structure of the connection end of a cooling plate, and a coolant pipe. FIG. 4 is a cross-sectional view showing a substantially inclined posture of the battery system shown in FIG. 3. It is a schematic longitudinal cross-sectional view of the battery system concerning other embodiment of this invention. It is sectional drawing which shows the substantial inclination attitude | position of the battery system shown in FIG. It is a general | schematic horizontal sectional view of the battery system concerning other embodiment of this invention. It is the XIV-XIV sectional view taken on the line of the battery system shown in FIG. It is sectional drawing which shows the substantial inclination attitude | position of the battery system shown in FIG. It is a general | schematic horizontal sectional view of the battery system concerning other embodiment of this invention. It is the XVII-XVII sectional view taken on the line of the battery system shown in FIG. It is the XVIII-XVIII sectional view taken on the line of the battery system shown in FIG. It is an expanded sectional view showing an example of the structure where a coolant pipe penetrates an exterior case. It is a general | schematic horizontal sectional view of the battery system concerning other embodiment of this invention. It is the XXI-XXI sectional view taken on the line of the battery system shown in FIG. It is sectional drawing which shows the substantial inclination attitude | position of the battery system shown in FIG. It is a general | schematic horizontal sectional view of the battery system concerning other embodiment of this invention. FIG. 24 is a sectional view of the battery system shown in FIG. 23 taken along line XXIV-XXIV. It is a general | schematic horizontal sectional view of the battery system concerning other embodiment of this invention. It is XXVI-XXVI sectional view taken on the line of the battery system shown in FIG. It is a general | schematic horizontal sectional view of the battery system concerning other embodiment of this invention. It is the XXVIII-XXVIII sectional view taken on the line of the battery system shown in FIG. FIG. 28 is a schematic exploded perspective view showing a stacked structure of a battery unit and a cooling plate of the battery system shown in FIG. 27. It is an expanded sectional view which shows an example of the structure where the connection end of a cooling plate penetrates an exterior case. It is a schematic vertical sectional view of a battery system according to another embodiment of the present invention. FIG. 32 is a block diagram of the battery system shown in FIG. 31. It is a block diagram which shows the example which mounts a battery system in the hybrid vehicle which drive | works with an engine and a motor. It is a block diagram which shows the example which mounts a battery system in the electric vehicle which drive | works only with a motor. It is sectional drawing which shows the substantial inclination attitude | position of the conventional battery system.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. However, the embodiment described below exemplifies a battery system for a vehicle for embodying the technical idea of the present invention and an electric vehicle including the battery system, and the present invention is a battery system and an electric vehicle. Is not specified as below. Furthermore, this specification does not limit the members shown in the claims to the members of the embodiments.

  The battery system shown in FIGS. 1 to 4 cools an exterior case 9, a battery unit 2 including a plurality of unit cells 1 housed in the exterior case 9, and a battery unit 2 in a thermally coupled state. And a cooling plate 3.

  As shown in FIGS. 5 and 6, in the battery unit 2, end plates 4 are arranged on both end surfaces of a battery stack 7 formed by stacking a plurality of unit cells 1, and the pair of end plates 4 are connected to the connector 5. It is connected with. The connector 5 fixes both ends to the end plate 4 to fix the stacked unit cells 1 in a pressed state. The unit cell 1 shown in the figure is a square battery. The battery stack 7 is formed by stacking prismatic unit cells 1 in the thickness direction with an insulating separator 6 interposed therebetween. The unit cell 1 is a lithium ion secondary battery. However, the unit cell is not specified as a lithium ion secondary battery, and can be any rechargeable battery such as a nickel metal hydride battery.

  In the unit cell 1, an electrode body (not shown) in which positive and negative electrode plates are stacked is housed in an outer can, filled with an electrolytic solution, and hermetically sealed. The outer can is hermetically closed at the opening with a sealing plate. The outer can is obtained by deep drawing a metal plate such as aluminum or aluminum alloy, and the sealing plate insulates and fixes the positive and negative electrode terminals 11. The metal outer can has good heat conduction, and is fixed in a thermally coupled state to the surface of the cooling plate 3 with the bottom surface 2A or the side surface 2B of the battery unit 2 as a thermal coupling surface.

  The separator 6 is formed of an insulating material such as plastic, and the unit cells 1 that are stacked on each other are stacked in an insulated state. The separator 6 is sandwiched between the unit cells 1 to insulate adjacent unit cells 1. The battery unit 2 is obtained by fixing the bus bar 12 to the electrode terminal 11 of the stacked unit cells 1 and connecting the unit cells 1 in series with the bus bar 12 or connecting a plurality of unit cells 1 in parallel. Connected in series. The battery unit 2 can connect the unit cells 1 in series to increase the output voltage to increase the output, and can connect adjacent unit cells 1 in parallel to increase the charge / discharge current.

  In the battery system, the cooling plate 3 is disposed on the bottom surface 2 </ b> A or the side surface 2 </ b> B of the battery unit 2, and the unit cell 1 of the battery unit 2 is cooled by the cooling plate 3. In the battery system shown in FIGS. 1, 2, and 4, the cooling plate 3 is disposed on the bottom surface 2 </ b> A, with the battery unit 2 placed on its side from the posture shown in FIG. 5. The battery system shown in FIGS. 1, 2, and 4 has a cooling plate 3 arranged in a vertical position between opposing bottom surfaces 2A of the battery units 2 arranged in two rows, and the batteries are placed on both sides of the cooling plate 3. Unit 2 is arranged. However, although not illustrated, the battery system can also arrange | position a cooling plate to the side surface 2B of the battery unit 2 by making the battery unit into the attitude | position shown in FIG. This structure can also arrange | position a battery unit on both surfaces of a cooling plate by arrange | positioning the cooling plate of a perpendicular attitude | position between the side surfaces of the battery unit arrange | positioned in 2 rows. Further, although not shown, the battery system has the battery unit in the posture shown in FIG. 5, the cooling plate is arranged on the bottom surface of the battery unit, that is, the battery unit is arranged on the upper surface of the cooling plate and stored in the outer case. You can also.

  The cooling plate 3 is connected to the thermal coupling surface of each unit cell 1 in a thermally coupled state to cool each unit cell 1. The cooling plate 3 is cooled by a coolant circulated inside. The cooling plate 3 is provided with a cooling liquid circulation path for circulating the cooling liquid therein. This circulation path cools the cooling plate 3 by circulating the coolant. 7 and 8, a stainless steel metal pipe 31 is embedded in a plate portion 30 made of aluminum die cast. Both ends of the metal pipe 31 protrude from the plate portion 30 to form a connection end 31A. The cooling plate 3 cools the plate portion 30 with a coolant circulated through the stainless steel pipe. The plate part 30 is disposed in a thermally coupled state to the battery unit 2 to cool the unit cell 1. Thus, the cooling plate 3 incorporating the metal pipe 31 for circulating the cooling liquid can reliably prevent liquid leakage inside. Further, the cooling plate 3 in which the metal pipe 31 is embedded in the plate portion 30 is excellent in heat conduction with the metal pipe 31 and the plate portion 30, and efficiently cools the plate portion 30 with the coolant circulated through the metal pipe 31. Thus, the unit cell 1 can be efficiently cooled. Moreover, the plate part 30 which has shape | molded the metal in plate shape has a large heat capacity, can absorb the heat_generation | fever of the unit cell 1 efficiently, and can restrict | limit the temperature rise of the unit cell 1. FIG. Moreover, the unit cell 1 can be cooled even after the circulation of the coolant is stopped. However, the present invention does not specify the structure of the cooling plate as the above structure. The cooling plate may have any structure that can cool the surface by circulating a coolant, such as a structure in which a metal pipe is fixed to the surface of a metal plate, or a structure in which a metal pipe is disposed between two metal plates. it can.

  As shown in FIGS. 1 to 3, the cooling plate 3 is connected to a cooling mechanism 35 via a coolant pipe 33. The coolant pipe 33 is a metal pipe. However, the coolant pipe is not necessarily a metal pipe, and any pipe that can circulate the coolant, such as a rubber-like elastic hose, can be used. Therefore, in this specification, “pipe” is used in a broad sense including a hose.

  FIG. 9 is a cross-sectional view showing a connection structure between the connection end 31 </ b> A provided on the cooling plate 3 and the coolant pipe 33. In the connection structure of this figure, a coolant pipe 33 is inserted into the connection end 31A, and an O-ring 34 is disposed between the connection end 31A and the coolant pipe 33 to connect to the watertight structure. In this connection structure, the coolant pipe 33 can be more reliably connected to the connection end 31A in a watertight structure as a metal pipe. In order to place the O-ring 34 at a fixed position, a ring groove is provided on the outer surface of the coolant pipe 33, or a ring groove is provided on the inner surface of the connecting end 31A. It can be a structure that does not. This connection structure can be easily connected to the connection end 31A by inserting the coolant pipe 33. Further, the coolant pipe 33 can be pulled out and easily removed. Since the coolant is not pressurized to a high pressure unlike the refrigerant, it can be easily detached with the connecting structure shown in the above figures.

  The cooling mechanism 35 cools the coolant by circulating the coolant through the coolant pipe 33 to the cooling plate 3. As shown in FIG. 1, the cooling mechanism 35 detects a battery temperature of the battery unit 2 and a heat exchanger 36 that cools the coolant, a circulation pump 37 that circulates the coolant cooled by the heat exchanger 36, and the battery unit 2. And a control circuit 38 for controlling the operation of the circulation pump 37. In the cooling mechanism 35, the control circuit 38 detects the battery temperature with a temperature sensor (not shown) and controls the operation of the circulation pump 37 to control the cooling state of the cooling plate 3. When the battery temperature becomes higher than the set temperature, the control circuit 38 operates the circulation pump 37. When the circulation pump 37 is operated, the coolant is circulated through the cooling plate 3 to cool it. When the battery temperature becomes lower than the set temperature, the control circuit 38 stops the operation of the circulation pump 37. In this state, the cooling liquid is not circulated through the cooling plate 3, and the cooling plate 3 is not forcibly cooled. The control circuit 38 stores a set temperature for operating the circulation pump 37, and controls the operation of the circulation pump 37 at this set temperature to control the battery temperature within a set range.

  The outer case 9 has a closed structure that does not ventilate outside air. In the exterior case 9, outside air does not enter and condensation does not occur on the surface of the cooling plate 3. For this reason, the condensed water on the surface of the cooling plate 3 can be reduced or almost eliminated. Further, the outer case 9 is sealed in a watertight structure that does not leak the coolant circulating in the cooling plate 3 to the outside even if the coolant leaks inside. A battery system that does not leak the leaked coolant to the outside can be disposed in the vehicle interior. Further, since water does not enter from the outside, it can be arranged outside the vehicle.

  In the exterior case 9 that does not leak the cooling liquid to the outside, if the cooling liquid leaks inside the case, the leaking liquid accumulates inside. When the leaked liquid accumulated inside contacts the battery unit 2, the unit cell 1 is short-circuited, causing a large short-circuit current to flow. This is because the battery unit 2 including the plurality of unit cells 1 has a potential difference between the outer cans of the unit cells 1 connected in series. This is because the unit cell 1 has an electrode plate (not shown) housed inside connected to the outer can, or is electrically connected to the outer can via the electrolytic solution. Moreover, since the unit cell 1 is provided with the positive and negative electrode terminals 11, even if the electrode terminal 11 is immersed in the leakage liquid, a short current flows. When the battery unit 2 is immersed in the leaked liquid and a short current flows, the short current has an adverse effect such as electrolyzing the coolant that is the leaked liquid to generate hydrogen.

  The outer case 9 has a maximum liquid level below the battery unit 2 in the substantially inclined posture of the outer case 9 in order to prevent the battery unit 2 from being immersed in the leaked liquid and causing a short current to flow. A liquid reservoir 22 having a partition wall 21 that lowers the temperature of the liquid is provided at the bottom, and a leakage liquid of the cooling liquid flows into the liquid reservoir 22 and accumulates.

  In the battery system, even when the exterior case 9 is arranged in a horizontal posture on the vehicle, the acceleration in the horizontal direction acts on the exterior case 9 when the vehicle is accelerated, decelerated, or turned left and right. When the acceleration acts in the horizontal direction, this acceleration is combined with the gravitational acceleration, and an acceleration that deviates from the vertical direction to the horizontal direction acts on the outer case 9. In this state, the liquid level of the leaked coolant changes to the same posture as the outer case 9 is tilted, that is, the state in which the outer case 9 is substantially tilted. In the present specification, not only the outer case 9 is actually inclined, but also the outer case 9 is in such a state, that is, the outer case 9 is substantially equivalent to the inclined state. Including “substantially inclined posture of the outer case 9”. If the coolant leaked at the bottom of the outer case 9 is accumulated, as shown in FIG. 35, the leaked liquid R is unevenly distributed to one side to increase the maximum liquid level (Hp) of the liquid level. The liquid level is the height of the outer case 109 from the bottom plate 109A. In this state, the outer case 9 of FIG. 3 is provided with a liquid reservoir 22 having a partition wall 21 in order to reduce the maximum liquid level of the leaked liquid. It flows into the liquid reservoir 22.

  The liquid reservoir 22 in FIG. 3 has a partition wall 21 as an upper and lower wall 21A extending in the vertical direction from the bottom plate 9A of the outer case 9, and a liquid reservoir 22 is provided on the bottom of the outer case 9 on the side of the upper and lower walls 21A. Yes. The liquid reservoir 22 in this figure is provided as two rows of partition walls 21 that are upper and lower walls 21 </ b> A, and the liquid reservoir 22 is provided between the two rows of partition walls 21. The liquid reservoir 22 is provided between the partition walls 21 formed of two rows of upper and lower walls 21 </ b> A, and has a shape that opens between the two rows of partition walls 21. There is a high probability that the coolant leaks from the connecting portion 32 between the cooling plate 3 and the coolant pipe 33. The exterior case 9 in this figure has the battery units 2 arranged in two rows on the left and right sides, the coolant pipe 33 is provided between the two rows of battery units 2, the coolant pipe 33 is branched, and the branch passage 33A is cooled. The plate 3 is connected to the connecting end 31A. In this battery system, the connecting portion 32 between the connecting end 31 </ b> A of the cooling plate 3 and the branch path 33 </ b> A of the coolant pipe 33 is arranged between the two rows of battery units 2, that is, in the central portion of the outer case 9. The liquid reservoir 22 is located between the two rows of battery units 2 so that the coolant leaking from the connecting portion 32 disposed between the two rows of battery units 2 flows into the liquid reservoir 22 without leakage. The upper opening of the liquid reservoir 22 is disposed below the connecting portion 32. The liquid reservoir 22 has the partition wall 21 composed of the upper and lower walls 21 </ b> A disposed along the opposing outer peripheral edges of the two rows of battery units 2, and the connecting portion 32 disposed between the two rows of battery units 2 as a liquid. Arranged above the reservoir 22. In the battery system having this structure, the coolant leaking from the connecting portion 32 surely flows into the liquid reservoir 22, and the maximum liquid level (Hp) of the leaked fluid R is lowered in the substantially inclined posture shown in FIG. To do.

  Further, in the battery system shown in FIG. 1, the coolant pipe 33 is piped between the end of one battery unit 2 and the outer case 9 (above the right battery unit 2 in the figure) and outside the outer case 9. Pull out. In order to arrange the entire coolant pipe 33 above the liquid reservoir 22, this battery system is also arranged between the outer peripheral edge of one battery unit 2 (the right battery unit 2 in the figure) and the coolant pipe 33. The liquid reservoir 22 is provided at the center of the exterior case 9 located below the coolant pipe 33 and at a part of the exterior case 9.

  This battery system is characterized in that even if the temperature of the coolant is lowered and condensation occurs on the surface of the coolant pipe 33, the condensed water does not touch the battery unit 2 and the harmful effects caused by the condensed water can be more reliably prevented. There is.

  Further, in the battery system of FIG. 11, the partition wall 23 of the upper and lower walls 21 </ b> A provided in two rows is provided at the center of the outer case 9 to form the liquid reservoir 22, and the partition wall 23 is disposed inside the liquid reservoir 22. To do. The partition wall 23 is provided along the partition wall 21 and allows the coolant that has leaked between the partition wall 23 and the partition wall 21 to flow in. In this battery system, the liquid reservoirs 22 are partitioned into two rows by the partition walls 23, so that the leaked liquid R leaking from the connecting portion 32 and flowing into the liquid reservoir 22 is in two rows as shown in FIG. It flows in separately. For this reason, there is a feature that the maximum liquid level (Hp) of the leaked liquid R can be further lowered in the substantially inclined posture of the outer case 9.

  In the battery system of FIGS. 13 and 14, the bottom plate 9A of the outer case 9 is provided with partition walls 21 made up of a plurality of rows of upper and lower walls 21A at predetermined intervals, and a plurality of liquid reservoirs 22 are provided on the bottom plate 9A. ing. As shown in FIG. 15, in this battery system, the leaked liquid R is stored by being distributed to a plurality of liquid reservoirs 22, so that the maximum liquid level (Hp) of the leaked liquid R is further increased in a substantially inclined posture. Can be lowered.

  Further, in the battery system shown in FIGS. 16 to 18, a tub 24 is provided inside the outer case 9, and the tub 24 is connected to the liquid reservoir 22. The eaves 24 are inclined downward toward the liquid reservoir 22 so that the leaked liquid flows into the liquid reservoir 22. The scissors 24 are arranged below the connecting portion 32 connecting the branch path 33A of the coolant pipe 33 to the connecting end 31A of the cooling plate 3 so that the leaked liquid leaked from the connecting portion 32 can flow without leaking. The leaked liquid leaking from the connecting portion 32 is received and flows into the liquid reservoir 22 with a downward slope. The liquid reservoir 22 is disposed inside the outer peripheral wall 9B on one side of the outer case 9 having a rectangular outer shape. In order to provide the liquid reservoir 22 here, a partition wall 21 composed of upper and lower walls 21A is disposed between the outer peripheral wall 9B on one side of the outer case 9 and the side surface of the battery unit 2, and the partition wall 21 and the outer peripheral wall 9B. A liquid reservoir 22 is provided between the bottom plate 9A and the bottom plate 9A.

  The above exterior case 9 has the battery units 2 arranged in two rows inside, the coolant pipe 33 is arranged in the center, and the connection end 31A of the coolant pipe 33 and the cooling plate 3 is provided in the center of the exterior case 9. Deploy. In order to allow the coolant leaking from the connecting portion 32 at the center of the outer case 9 to flow in without leaking, the flange 24 is disposed at the center of the outer case 9 and between the battery units 2 arranged in two rows. In the battery system having this structure, the coolant leaking from the connecting portion 32 is surely dropped into the tub 24 and supplied from the tub 24 to the liquid reservoir 22. The tub 24 is connected to the partition wall 21 forming the liquid reservoir 22, and allows the coolant leaking from the connection portion 32 to flow into the liquid reservoir 22.

  Further, in the illustrated battery system, the coolant pipe 33 piped above the flange 24 is piped between the end of one battery unit 2 and the outer case 9 (above the right battery unit 2 in FIG. 16). Then, while penetrating through the partition wall 21 of the upper and lower walls 21A, the outer case 9 is penetrated from the liquid reservoir 22 and pulled out to the outside of the outer case 9, and the projecting tips are used as the suction side connection end 33X and the discharge side connection end 33Y. Yes. The coolant pipe 33 penetrates the partition wall 21 and the outer case 9 in a watertight structure, and a cross-sectional view of this portion is shown in FIG. In the coolant pipe 33 in this figure, a pair of sandwiching plates 15 are opposed to each other in a parallel posture and fixed to a watertight structure. The sandwiching plate 15 is disposed on both surfaces of the outer case 9 and the partition wall 21, and packing 16 such as an O-ring is disposed on the inner surface of the sandwiching plate 15, and the packing 16 is sandwiched between the sandwiching plate 15, the exterior case 9 and the partition wall 21. The coolant pipe 33 is fixed to the through hole 9a and the partition wall 21 of the outer case 9 in a watertight structure. The coolant pipe that runs above the ridge passes through the ridge from the top to the bottom, lays below the ridge, penetrates the partition wall and the outer case into the watertight structure, and connects the suction side connection end and the discharge side connection end. Can be provided to project outward.

  Further, in the battery system shown in FIG. 20 and FIG. 21, the lid plate 21B, which is separated upward from the bottom plate 9A of the outer case 9 and has an opening 21b in part, is used as the partition wall 21, and the lid plate 21B and the bottom plate 9A A liquid reservoir 22 is provided between the two. The exterior case 9 in this figure is provided with a partition wall 23 extending along the center of the exterior case 9 between the two rows of battery units 2, and the partition walls 21 of the lid plate 21 </ b> B are disposed on both sides of the partition wall 23. ing. The lid plate 21B shown in the drawing is provided with an opening 21b located at the center of each. However, the lid plate can also have an opening at a position closer to the partition wall side than the center portion, that is, to the center portion side of the exterior case.

  The outer case 9 described above has the liquid reservoirs 22 on both sides of the partition wall 23 with the partition walls 21 of the lid plates 21B. In this battery system, in a substantially inclined posture, as shown in FIG. 22, the leaked liquid R can be stored in the liquid reservoir 22, and the maximum liquid level can be lowered. In particular, the liquid reservoirs 22 provided by being partitioned on both sides of the partition wall 23 can divide and store the leaked liquid R, thereby lowering the maximum liquid level in a substantially inclined posture. However, in the battery system of the present invention, the liquid reservoir is not necessarily partitioned by the partition wall, and the continuous liquid reservoir is provided on the bottom plate of the outer case to reduce the maximum liquid level in a substantially inclined posture. You can also.

  Further, in the battery system of FIGS. 23 and 24, a recess 17 is provided in the bottom plate 9A of the outer case 9, and the partition wall 21 of the lid plate 21B is disposed in the opening of the recess 17, so that the partition wall 21 of the lid plate 21B A liquid reservoir 22 is provided below. The partition wall 21 of the lid plate 21B has an opening 21b through which the leaked liquid R flows. In this battery system, since the liquid reservoir 22 is provided in the concave portion 17 of the bottom plate 9A, the maximum liquid level of the leaked liquid R can be lowered in a substantially inclined posture by storing the leaked liquid R therein. This is because the liquid reservoir 22 is disposed below the bottom plate 9 </ b> A of the part that houses the battery unit 2.

  The battery system of FIGS. 25 to 28 is provided with a connecting end 31 </ b> A protruding from the plate portion 30 of the cooling plate 3. The cooling plate 3 is disposed in the outer case 9 with the plate portion 30 in a thermally coupled state to the unit cell 1 of the battery unit 2, and the connecting end 31 </ b> A is inserted into the through hole 9 a provided in the outer case 9. A protruding portion that protrudes to the outside of the case 9 is an external connecting portion 29. A coolant pipe 33 that circulates the coolant is connected to the external connection portion 29, and the coolant is circulated to the cooling plate 3 via the coolant pipe 33.

  In the battery system shown in FIGS. 25 and 26, a connecting portion 31 </ b> A that protrudes horizontally from the cooling plate 3 penetrates the outer peripheral wall 9 </ b> B of the outer case 9 and protrudes to the outside. In this battery system, the coolant pipe 33 is arranged along the outer peripheral wall 9 </ b> B of the outer case 9.

  In the battery system shown in FIGS. 27 and 28, as shown in FIG. 29, a connecting portion 31 </ b> A protrudes downward from the cooling plate 3, and the connecting end 31 </ b> A penetrates the bottom plate 9 </ b> A of the exterior case 9. It protrudes to the outside. In this battery system, a coolant pipe 33 is disposed along the bottom plate 9 </ b> A on the lower surface side of the exterior case 9.

  In order to seal the through hole 9a of the outer case 9 in a watertight structure, as shown in the sectional view of FIG. 30, there is a gap between the plate portion 30 of the cooling plate 3 and the inner surface of the outer case 9 around the through hole 9a. Packing 18 is arranged. The packing 18 is sandwiched between the plate portion 30 and the outer case 9 to seal the through hole 9 a in a watertight structure inside the outer case 9. This battery system has a watertight structure with a packing 18 in which a connecting portion 32 between the external connecting portion 29 of the cooling plate 3 and the coolant pipe 33 is arranged outside the outer case 9 and the through hole 9 a is arranged inside the outer case 9. Seal to. In this structure, the coolant leaking from the connecting portion 32 is leaked to the outside of the exterior case 9, and the through hole 9a is sealed in a watertight structure by the packing 18, so that the leaked coolant enters the interior of the exterior case 9. The battery unit 2 is not adversely affected. The through hole 9a of the outer case 9 can be provided in the bottom plate 9A of the outer case 9 as shown in FIG. 28, or can be provided in the outer peripheral wall 9B of the outer case 9 as shown in FIGS. Although not shown, it can be provided on the top plate of the exterior case.

  In the battery system that cools the battery unit 2 with the coolant, a particularly short current flows when the leaked coolant shorts the output terminal 11. The battery system that prevents this problem includes a leakage sensor that detects that the coolant has leaked. When this leakage sensor detects a leakage, the contactor connected to the output side of the battery unit is switched to an off state. In this battery system, it is necessary to provide a control circuit for switching the contactor in a state in which leakage is detected by the leakage sensor and the leakage sensor, and the circuit configuration is complicated.

  In the battery system shown in the vertical sectional view of FIG. 31 and the block diagram of FIG. 32, a fuse 41 is connected between the battery unit 2 and the output connector 40. The output connector 40 is fixed to the outer case 9 with a waterproof structure. Although not shown, the output connector 40 has a metal terminal fixed to a watertight structure on a main body portion of an insulating material. A metal terminal can be insert-molded into a plastic main body and fixed to a watertight structure. The metal terminal penetrates the body part inward and outward, is exposed to the inside and outside, the inside exposed part is used as a pair of connection terminals for connecting to the positive and negative output sides of the battery unit 2, and the outside exposed part is used as the battery system. This is an output terminal for connecting to an external device. The main body is fixed to a through hole 9 b provided in the outer case 9 in a watertight structure, and a connection terminal exposed to the inside is arranged in the liquid reservoir 22.

  The pair of connection terminals exposed to the inside of the main body are disposed in the liquid reservoir 22 so as to face each other, and when immersed in the leaked liquid R of the liquid reservoir 22, the output of the battery unit 2 through the leaked liquid R. The fuse 41 is blown by this short current. The short-circuit current of the battery unit 2 is specified by the electrical resistance between the pair of connection terminals immersed in the leaked liquid R and the output voltage of the battery unit 2, and the electrical resistance between the connection terminals is reduced. Increase to increase. The electrical resistance between the connection terminals is reduced by narrowing the interval between the connection terminals and increasing the contact area with the leakage liquid R. In order to blow the fuse 41 with a short current, the pair of connection terminals can flow a current larger than the fusing current through the fuse 41 when immersed in the leaked liquid R flowing into the liquid reservoir 22. That is, the contact area with the leaked liquid R and the facing distance are specified.

  In the battery system described above, when the coolant leaked into the liquid reservoir 22, the positive and negative connection terminals of the output connector 40 are immersed in the leak liquid R, the positive and negative connection terminals are immersed in the leak liquid R, The fuse 41 is blown by short-circuiting the output side of the battery unit 2 through the connection terminals. The short current flows in a loop from the battery unit 2 → the fuse 41 → the connection terminal of the output connector 40 → the ON contactor 42 → the battery unit 2 as shown by an arrow in FIG. When the fuse 41 is blown, the output voltage of the battery unit 2 is not output to the output terminal of the output connector 40. Therefore, the output of the output terminal can be cut off in a state where the coolant leaks without providing a complicated control circuit for detecting the coolant leak and switching the contactor 42 off.

The battery system shown in FIGS. 1 to 4 is assembled in the following steps.
(1) As shown in FIG. 6, a plurality of unit cells 1 are stacked to form a battery stack 7. The plurality of unit cells 1 are stacked such that a separator 6 is interposed between the unit cells 1 adjacent to each other.
(2) As shown in FIG. 6, the end plates 4 are arranged on both end faces of the battery stack 7, and the pair of end plates 4 are connected by a connector 5 to form the battery unit 2. In the battery unit 2, the electrode terminals 11 of the unit cells 1 stacked on each other are connected to a predetermined connection state by a bus bar 12.
(3) As shown in FIG. 4, the cooling plate 3 is disposed on the bottom surface 2 </ b> A of the battery unit 2 in which the plurality of unit cells 1 are stacked. At this time, the cooling plate 3 in a vertical posture is arranged between the bottom surfaces 2A facing the battery units 2 arranged in two rows, and the battery units 2 are arranged on both surfaces of the cooling plate 3.
(4) The battery unit 2 to which the cooling plate 3 is connected is stored in the outer case 9. The battery units 2 to which the cooling plates 3 are connected are arranged in a plurality of rows and arranged in the outer case 9 in a predetermined arrangement. In the outer case 9, the coolant pipe 33 is disposed at a fixed position. As shown in FIG. 1, one end of the coolant pipe 33 is drawn to the outside of the outer case 9 to serve as a suction side connection end 33 </ b> X and a discharge side connection end 33 </ b> Y.
(5) The coolant pipe 33 is connected to the connection end 31 </ b> A of the cooling plate 3. The coolant pipe 33 is connected to each other by the branch portion 33A being inserted into the connecting end 31A.
(6) The cooling mechanism 35 is connected to the suction side connection end 33X and the discharge side connection end 33Y of the coolant pipe 33.

  The above battery system can be used as an in-vehicle power source. As a vehicle equipped with a battery system, an electric vehicle such as a hybrid vehicle or a plug-in hybrid vehicle that runs with both an engine and a motor, or an electric vehicle that runs only with a motor can be used and used as a power source for these vehicles. .

(Battery system for hybrid vehicles)
FIG. 33 shows an example in which a battery system is mounted on a hybrid vehicle that runs with both an engine and a motor. A vehicle HV equipped with the battery system 90 shown in this figure includes an engine 96 and a running motor 93 that run the vehicle HV, a battery system 90 that supplies power to the motor 93, and power generation that charges the batteries of the battery system 90. A vehicle body 91 on which a machine 94, an engine 96, a motor 93, a battery system 90, and a generator 94 are mounted, and wheels 97 that are driven by the engine 96 or the motor 93 to drive the vehicle body 91. . The battery system 90 is connected to a motor 93 and a generator 94 via a DC / AC inverter 95. The vehicle HV travels by both the motor 93 and the engine 96 while charging / discharging the battery of the battery system 90. The motor 93 is driven in a region where the engine efficiency is poor, for example, during acceleration or during low-speed travel, to drive the vehicle HV. The motor 93 is driven by power supplied from the battery system 90. The generator 94 is driven by the engine 96 or is driven by regenerative braking when the vehicle is braked to charge the battery of the battery system 90.

(Battery system for electric vehicles)
FIG. 34 shows an example in which a battery system is mounted on an electric vehicle that runs only with a motor. A vehicle EV equipped with the battery system 90 shown in this figure includes a motor 93 for traveling the vehicle EV, a battery system 90 for supplying electric power to the motor 93, and a generator for charging the battery of the battery system 90. 94, a vehicle main body 91 on which a motor 93, a battery system 90, and a generator 94 are mounted, and wheels 97 that are driven by the motor 93 and cause the vehicle main body 91 to travel. The battery system 90 is connected to a motor 93 and a generator 94 via a DC / AC inverter 95. The motor 93 is driven by power supplied from the battery system 90. The generator 94 is driven by energy when regenerative braking of the vehicle EV, and charges the battery of the battery system 90.

  The battery system of the present invention can be suitably used as a power source for a motor that drives a vehicle such as a hybrid car, a plug-in hybrid car, or an electric vehicle.

DESCRIPTION OF SYMBOLS 1 ... Unit cell 2 ... Battery unit 2A ... Bottom
2B ... Side 3 ... Cooling plate 4 ... End plate 5 ... Connector 6 ... Separator 7 ... Battery laminate 9 ... Exterior case 9A ... Bottom plate
9B ... Outer wall
9a ... through hole
9b ... Through-hole 11 ... Electrode terminal 12 ... Bus bar 15 ... Clamping plate 16 ... Packing 17 ... Recess 18 ... Packing 21 ... Partition 21A ... Upper and lower walls
21B ... Lid plate
21b ... Opening part 22 ... Liquid reservoir 23 ... Partition wall 24 ... Bag 29 ... External connection part 30 ... Plate part 31 ... Metal pipe 31A ... Connection end 32 ... Connection part 33 ... Coolant pipe 33A ... Branch
33X ... Suction side connection end
33Y ... discharge side connection end 34 ... O-ring 35 ... cooling mechanism 36 ... heat exchanger 37 ... circulation pump 38 ... control circuit 40 ... output connector 41 ... fuse 42 ... contactor 90 ... battery system 91 ... vehicle body 93 ... motor 94 ... power generation Machine 95 ... DC / AC inverter 96 ... Engine 97 ... Wheel 102 ... Battery unit 109 ... Exterior case 109A ... Bottom plate HV ... Vehicle EV ... Vehicle R ... Leakage liquid

Claims (6)

A battery unit including a plurality of unit cells ;
Wherein a cooling plate that will be disposed in thermally coupled state in the battery unit, the cooling plate to the cooling liquid circulating inside the cooling plate is connected to the cooling mechanism, and said cooling plate,
An outer case for housing the battery unit and the cooling plate, wherein the outer case has a plurality of upper and lower walls provided so as to extend vertically inside the bottom surface of the outer case. And comprising
The plurality of upper and lower walls include a plurality of rows of partition walls positioned below the battery unit, and a liquid reservoir is formed between adjacent partition walls,
The plurality of rows of partition walls have a space formed between a tip of the partition walls and a lower surface of the battery unit, and adjacent liquid reservoirs communicate with each other by the space . Furthermore, a coolant pipe that connects the cooling plate and the cooling mechanism is provided,
The cooling plate has a connecting end to which the coolant pipe is connected ;
The battery system according to claim 1, wherein a connecting portion between the connecting end and the coolant pipe is located inside the exterior case. Comprising a linked trough before Symbol liquid reservoir,
The scissors are inclined downward toward the liquid reservoir, and the scissors are disposed below the connecting portion between the coolant pipe and the connecting end, and the coolant that leaks from the connecting portion The battery system according to claim 1 or 2, wherein the battery system is configured to flow into the liquid reservoir through the tub. Furthermore, the battery unit and a fuse connected to the direct current, connected to the output side of the battery unit through the fuse, and provided with an output connector fixed to the exterior case with a waterproof structure,
The output connector is disposed in one of the plurality of liquid reservoirs,
It claims 1 and so as to blow the fuse by shorting the output side of the battery unit in coolant output connector flowing into the liquid reservoir of the output connector is located at a power of the battery unit either 3 A battery system described in The battery system outer case, which is described in any of 4 to claims 1, characterized in that it is sealed in watertight. An electric vehicle comprising the battery system according to any one of claims 1 to 5 ,
An electric vehicle in which the battery system supplies power to a motor that drives the vehicle.

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