JP2019212468A - Battery module - Google Patents

Abstract

To provide a battery module capable of effectively cooling a battery stack in an abnormal situation.SOLUTION: A battery module 10 includes a battery stack 14 having a plurality of battery cells 18, a battery cooling unit 15 disposed between the battery cells 18 and forming a path through which a battery cooling fluid 19 for cooling the battery cells 18 circulates, and a projecting unit 37 as an outflow site forming unit that forms an outflow portion 40 in which the battery cooling fluid 19 flows from the battery cooling unit 15 to the battery stack 14 side when the battery cooling unit 15 is in an abnormal state.SELECTED DRAWING: Figure 5

Description

  The present invention relates to a battery module, and more particularly, to a battery module having an emergency cooling function in the event of an abnormality.

  A hybrid vehicle or an electric vehicle is equipped with a large battery that supplies electric power to a motor that provides driving force to the vehicle. Moreover, since the battery with which the vehicle to apply | hang | starts may generate | occur | produce heat at the time of abnormality, it has the function to cool a battery in such a case.

  In Patent Document 1, rectangular flat cells are stacked in the vertical direction, and a hollow body in which a cooling fluid flows is disposed between the rectangular flat cells. When the rectangular flat battery generates heat at the time of abnormality, the hollow body is melted so that the cooling fluid flows out of the hollow body, and the rectangular flat battery is cooled by the flowing cooling fluid.

  Patent Document 2 describes an invention in which the flow rate of a cooling fluid is changed in accordance with the state of a storage battery. Specifically, the internal resistance of the storage battery is estimated by the estimation unit. And if the estimated internal resistance value is high, the flow rate of the cooling water for cooling the storage battery is increased. On the other hand, if the estimated internal resistance value is low, the flow rate of the cooling water is decreased. By doing in this way, the flow volume of cooling water can be optimized according to the condition of a storage battery.

JP 2009-54297 A JP 2012-221927 A

  However, in the invention described in Patent Document 1, fluid flows out from the hollow body by utilizing the heat generated by the rectangular flat battery at the time of abnormality, but a specific portion for allowing fluid to flow out is formed. Not. Therefore, there is a problem that it is not easy to effectively supply the fluid to the rectangular flat battery at the time of abnormality.

  Furthermore, in the invention described in Patent Document 2, the flow rate of the cooling fluid is adjusted based on the internal resistance of the storage battery, but in the event of an abnormality, the flow rate of the cooling fluid is optimized based on the internal resistance. That was a difficult task.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a battery module that can effectively cool a battery stack in an abnormal state.

  The battery module of the present invention includes a battery stack having a plurality of battery cells, a battery cooling unit that is disposed between the battery cells and that forms a path through which a battery cooling fluid that cools the battery cells flows, and the battery And an outflow portion forming portion for forming an outflow portion where the battery cooling fluid flows from the battery cooling portion to the battery stack when the cell is in an abnormal state.

  In the battery module of the present invention, the battery cooling section includes a casing section and a wall section formed in a wall shape inside the casing section, and the outflow portion forming section includes the wall section. It is the protrusion part which made the part protrude partially toward the said housing | casing part, It is characterized by the above-mentioned.

  Moreover, in the battery module of the present invention, the outflow portion forming portion is an abnormal-time opening portion that is opened by heat or pressure from the smoke exhaust valve of the battery cell when the battery cell is in the abnormal state. It is characterized by.

  In the battery module of the present invention, the battery cooling part includes a main surface part disposed between the battery cells and a protruding part protruding to the side of the battery cell.

  In the battery module of the present invention, a slit is formed as a gap between the battery cooling parts below the battery cell.

  In the battery module of the present invention, the flow rate of the battery cooling fluid flowing out from the slit is made smaller than the flow rate of the battery cooling fluid flowing out from the outflow portion in an abnormal state.

  In the battery module of the present invention, the pump that supplies the battery cooling fluid to the battery cooling unit, a temperature sensor that detects the temperature of the battery stack, and the discharge force of the pump based on the output of the temperature sensor A control unit that controls the battery cooling fluid that the pump supplies to the battery cooling unit when the temperature of the battery stack detected by the temperature sensor is equal to or higher than a first temperature. The flow rate is increased.

  In the battery module of the present invention, the controller limits charging / discharging of the battery stack when the temperature of the battery stack detected by the temperature sensor is equal to or higher than the first temperature.

  In the battery module according to the aspect of the invention, if the temperature of the battery stack detected by the temperature sensor is equal to or higher than a second temperature set higher than the first temperature, the control unit is configured so that the pump is the battery. The flow rate of the battery cooling fluid supplied to the cooling unit is further increased.

  The battery module of the present invention includes a battery stack having a plurality of battery cells, a battery cooling unit that is disposed between the battery cells and that forms a path through which a battery cooling fluid that cools the battery cells flows, and the battery And an outflow portion forming portion for forming an outflow portion where the battery cooling fluid flows from the battery cooling portion to the battery stack when the cell is in an abnormal state. Therefore, when an abnormality occurs in the battery cell, the battery cooling fluid flows out to the battery stack side because the outflow site forming part forms the outflow site with the expansion of the battery cell. Therefore, when an abnormality occurs in the battery cell, it is possible to prevent smoke and fire.

  In the battery module of the present invention, the battery cooling section includes a casing section and a wall section formed in a wall shape inside the casing section, and the outflow portion forming section includes the wall section. It is the protrusion part which made the part protrude partially toward the said housing | casing part, It is characterized by the above-mentioned. Therefore, when the battery cell in an abnormal state expands, the protruding portion of the wall portion contacts the housing portion from the inside along with the expansion, so that an outflow site is formed in the housing portion. If it becomes like this, a battery cooling fluid will flow out into a battery cell via this outflow part, and a battery cell will be cooled suitably.

  Moreover, in the battery module of the present invention, the outflow portion forming portion is an abnormal-time opening portion that is opened by heat or pressure from the smoke exhaust valve of the battery cell when the battery cell is in the abnormal state. It is characterized by. Therefore, when the battery cell is in an abnormal state, the battery cooling fluid is supplied from the outflow site to the vicinity of the smoke exhaust valve of the battery cell, so that smoke and ignition can be more reliably suppressed.

  In the battery module of the present invention, the battery cooling part includes a main surface part disposed between the battery cells and a protruding part protruding to the side of the battery cell. Therefore, by forming the outflow portion forming portion on the main surface portion or the protruding portion of the battery cooling portion, it is possible to effectively cool the battery cell at the time of abnormality.

  In the battery module of the present invention, a slit is formed as a gap between the battery cooling parts below the battery cell. Therefore, the battery cooling fluid that flows out from the outflow site in the event of an abnormality can be discharged to the outside via the slit, and the battery cell is reliably brought into contact with the battery cell to ensure ignition of the battery cell. Can be prevented.

  In the battery module of the present invention, the flow rate of the battery cooling fluid flowing out from the slit is made smaller than the flow rate of the battery cooling fluid flowing out from the outflow portion in an abnormal state. Therefore, the time for the battery cooling fluid to exchange heat with the battery cell can be secured above a certain level, and the effect of preventing overheating of the battery cell can be made remarkable.

  In the battery module of the present invention, the pump that supplies the battery cooling fluid to the battery cooling unit, a temperature sensor that detects the temperature of the battery stack, and the discharge force of the pump based on the output of the temperature sensor A control unit that controls the battery cooling fluid that the pump supplies to the battery cooling unit when the temperature of the battery stack detected by the temperature sensor is equal to or higher than a first temperature. The flow rate is increased. Therefore, when the battery stack is in an abnormal state, a large amount of battery cooling fluid is supplied to the battery cooling unit, so that overheating of the battery stack can be prevented, and smoke generation and the like can be prevented.

  In the battery module of the present invention, the controller limits charging / discharging of the battery stack when the temperature of the battery stack detected by the temperature sensor is equal to or higher than the first temperature. Therefore, overheating and electric leakage of the battery stack can be prevented.

  In the battery module according to the aspect of the invention, if the temperature of the battery stack detected by the temperature sensor is equal to or higher than a second temperature set higher than the first temperature, the control unit is configured so that the pump is the battery. The flow rate of the battery cooling fluid supplied to the cooling unit is further increased. Therefore, even when the temperature of the battery stack further rises, overheating of the battery stack can be prevented by increasing the flow rate of the battery cooling fluid supplied to the battery stack.

It is side sectional drawing which shows the vehicle by which the battery module which concerns on embodiment of this invention was integrated. It is a block diagram which shows the vehicle incorporating the battery module which concerns on embodiment of this invention. It is sectional drawing which shows partially the battery module which concerns on embodiment of this invention. It is a figure which shows the battery module which concerns on embodiment of this invention, (A) is a perspective view which shows a battery cooling part, (B) and (C) are sectional drawings of a battery cooling part. It is a figure which shows partially the battery module which concerns on embodiment of this invention, and is sectional drawing which shows the condition which forms an outflow site | part with a protrusion part. It is a figure which shows the battery module which concerns on embodiment of this invention, and is sectional drawing which shows the other form of an outflow site | part formation part. It is a figure which shows the battery module which concerns on embodiment of this invention, (A) is sectional drawing which shows the battery cooling part and battery stack of another form, (B) is the battery cooling part and battery stack in an abnormal state FIG. It is a perspective view which shows the battery cooling part which concerns on the other form of this invention. It is a figure which shows the battery module which concerns on embodiment of this invention, and is a flowchart which shows the method of cooling a battery at the time of abnormality.

  Hereinafter, the battery module 10 according to the present embodiment will be described with reference to the drawings. In the following description, the same members are denoted by the same reference numerals in principle, and repeated description is omitted.

  With reference to FIG. 1, the vehicle 20 provided with the battery module 10 of this form is demonstrated. The vehicle 20 is, for example, an electric vehicle or a hybrid vehicle. When the vehicle 20 is an electric vehicle, the vehicle 20 travels using a motor that rotates with electric power supplied from the battery module 10 as a drive source. When the vehicle 20 is a hybrid vehicle, the vehicle 20 travels using one or both of the motor and the engine as a drive source.

  The battery module 10 is disposed obliquely below and behind the seat 22, which is a rear seat, and is covered with a partition plate 23. Here, the battery module 10 may be disposed below the seat 22 or the like.

  The connection configuration of the battery module 10 will be described with reference to FIG. The battery module 10 includes a battery stack 14, a battery cooling unit 15, a pump 12, a radiator 17, a control unit 13, a temperature sensor 11, and a motor 16.

  The battery stack 14 is composed of a plurality of plate cells as will be described later, and is also referred to as a battery pack. As the battery stack 14, for example, a lithium battery can be employed.

  The battery cooling unit 15 is disposed so as to be in close contact with the battery stack 14, and a flow path through which the battery cooling fluid 19 flows is formed inside, and cools the battery stack 14 during charging and discharging.

  The radiator 17 cools the battery cooling fluid 19 by exchanging heat between the battery cooling fluid 19 and the external atmosphere.

  The pump 12 applies pressure to the battery cooling fluid 19 so that the battery cooling fluid 19 circulates between the radiator 17 and the battery cooling unit 15.

  The temperature sensor 11 is a sensor that measures the temperature of the battery stack 14, and transmits an electrical signal indicating the temperature of the battery stack 14 to the control unit 13.

  The control unit 13 includes a CPU, a RAM, a ROM, and the like, and controls the discharge force of the pump 12 based on the temperature of the battery stack 14 measured by the temperature sensor 11.

  The motor 16 is a driving force generating means that rotates with electric power supplied from the battery stack 14 and applies a driving force to the vehicle 20 shown in FIG. Here, a charging engine for charging the battery stack 14 may be provided.

  The battery module 10 having the above configuration operates as follows. That is, when the battery stack 14 is charged, power is supplied to the battery stack 14 from an external power source, an in-vehicle engine, or the like. In order to prevent overheating of the battery stack 14 during charging, the control unit 13 operates the pump 12 according to the output of the temperature sensor 11 and supplies the battery cooling fluid 19 to the battery cooling unit 15. The battery cooling fluid 19 circulates between the radiator 17 and the battery cooling unit 15 by the operation of the pump 12. The battery cooling fluid 19 exchanges heat with the battery stack 14 to prevent overheating of the battery stack 14 during charging.

  When the battery stack 14 is discharged, the motor 16 is rotated by the electric power supplied from the battery stack 14, so that driving force is applied to the vehicle 20 described above. Further, when the battery stack 14 is discharged, the control unit 13 operates the pump 12 according to the output of the temperature sensor 11. When the pump 12 is operated, the battery cooling fluid 19 is circulated between the radiator 17 and the battery cooling unit 15. The battery cooling fluid 19 exchanges heat with the battery stack 14 inside the battery cooling unit 15, thereby preventing overheating when the battery stack 14 is discharged.

  A related configuration of the battery cooling unit 15 and the battery stack 14 will be described with reference to FIG. This figure is a sectional view partially showing the battery cooling section 15 and the battery stack 14.

  The battery stack 14 includes a plurality of stacked cells. Here, battery cells 181, 182, 183, and 184 are shown. Each battery cell 181 or the like has a substantially plate shape.

  A battery cooling section 15 is disposed between the battery stacks 14. Specifically, a battery cooling unit 151 is disposed between the battery cell 181 and the battery cell 182, and a battery cooling unit 152 is disposed between the battery cell 182 and the battery cell 183. A battery cooling unit 153 is disposed between the battery cell 184 and the battery cooling unit 154 is disposed on the right side of the battery cell 184.

  The battery cooling part 151 and the like have a substantially casing-like configuration, and the battery cooling fluid 19 circulates therein. As the battery cooling fluid 19, non-conductive fluid such as water, antifreeze, oil, or a mixed liquid thereof can be used.

  While the battery stack 14 is being charged and discharged, the battery cooling fluid 19 flows through the battery cooling unit 15 according to the temperature of the battery stack 14 and the like. Specifically, the battery cooling fluid 19 circulates in the order of the battery cooling units 151, 152, 153, and 154. The battery cooling fluid 19 flowing through the battery cooling unit 151 exchanges heat with the battery cell 181 and the battery cell 182. The battery cooling fluid 19 flowing through the battery cooling unit 152 exchanges heat with the battery cell 182 and the battery cell 183. The battery cooling fluid 19 flowing through the battery cooling unit 153 exchanges heat with the battery cell 183 and the battery cell 184. The battery cooling fluid 19 flowing through the battery cooling unit 154 exchanges heat with the battery cell 184. Thus, each battery cell 181 grade | etc., Can be cooled efficiently because each battery cooling part 151 grade | etc., Carries out heat exchange with each battery cell 181 grade | etc.,.

  The configuration of the battery cooling unit 15 will be described with reference to FIG. 4A is a perspective view of the battery cooling unit 15 as viewed from above, and FIG. 4B is a cross-sectional view taken along the line AA in FIG. 4A, and FIG. These are sectional drawings in the BB line of Drawing 4 (A).

  With reference to FIG. 4 (A), the battery cooling part 15 is exhibiting the housing | casing shape which has the internal space in which the above-mentioned battery cooling fluid 19 distribute | circulates. Specifically, the battery cooling unit 15 includes a main surface portion 24 that has a plate shape that is elongated in the vertical direction, and a protruding portion 25 that protrudes forward in the vicinity of the upper end portion of the main surface portion 24. . The battery cooling unit 15 is made of, for example, an integrally molded synthetic resin.

  The main surface portion 24 has a lower surface 32 facing downward, an upper surface 33 facing upward, a front surface 28 facing forward, a rear surface 29 facing rearward, a left side surface 30 facing left, and a right side surface 31 facing right. doing.

  The protrusion 25 has a lower surface 35 facing downward and a front surface 34 facing forward.

  The injection port 26 is formed by opening the left end portion of the front surface 34 in a substantially circular shape. The inlet 26 is an opening through which the battery cooling fluid 19 is injected into the battery cooling unit 15.

  A discharge port 27 is formed by opening the upper left end portion of the rear surface 29 in a substantially circular shape. The discharge port 27 is an opening through which the battery cooling fluid 19 that has circulated through the battery cooling unit 15 is taken out. When viewed from the front, the inlet 26 and the outlet 27 are arranged so as to overlap each other.

  Referring to FIG. 4B, a wall portion 36 is formed inside the battery cooling portion 15. The wall portion 36 is formed in a wall shape from the left side surface 30 to the right side surface 31. Further, the projecting portion 37 is formed by projecting the vicinity of the central portion of the wall portion 36 in the left-right direction toward the front-rear direction. The protruding portion 37 protrudes in a wedge shape in the front-rear direction. Here, the some protrusion part 37 is formed in substantially equal intervals.

  Referring to FIG. 4C, the wall portion 36 extends from the upper surface 33 to the vicinity of the lower surface 32. That is, a gap for the battery cooling fluid 19 to flow is formed between the wall 36, the lower end, and the lower surface 32. The protrusion 37 described above is formed at a substantially central portion of the wall portion 36 in the vertical direction.

  Further, the above-described protruding portion 37 is disposed in a portion corresponding to the vicinity of the central portion of the battery cell 181 and the like shown in FIG. 3 in the vertical direction and the horizontal direction. By doing in this way, when battery cell 181 grade | etc., Expands abnormally, since the amount of expansion | swelling of a center part is large, so that it may mention later, an opening can be formed using the expansion | swelling.

  Further, referring to FIG. 4C, when the battery cooling fluid 19 flows through the inside of the battery cooling section 15, the battery cooling fluid 19 that has flowed from the inlet 26 flows between the front surface 28 and the wall section 36. It circulates in the space below. Next, the battery cooling fluid 19 flows upward in the space between the wall portion 36 and the rear surface 29. Thereafter, the battery cooling fluid 19 flows out from the discharge port 27. By doing in this way, the path | route through which the battery cooling fluid 19 distribute | circulates inside the battery cooling part 15 can be lengthened, and the battery stack 14 and the battery cooling fluid 19 can be heat-exchanged more effectively. it can.

  With reference to FIG. 5, the case where the battery cell 182 and the battery cell 183 expand | swell at the time of abnormality is demonstrated. When the battery cell 182 and the battery cell 183 are in an abnormal state due to the occurrence of an internal short circuit or the like, the battery cell 182 and the battery cell 183 expand as the temperature rises.

  When the battery cell 182 abnormally expands, both side surfaces of the battery cell 182 expand toward the side. As a result, the front surface 28 that is in contact with the rear side surface of the battery cell 182 is similarly deformed rearward, and the intermediate portion of the front surface 28 is in contact with the protruding portion 37. When the abnormal expansion of the battery cell 182 further proceeds, the front surface 28 is strongly pressed against the projecting portion 37 having a sharp shape. And the outflow site | part 40 is formed because the part which contacts the protrusion part 37 of the front surface 28 opens.

  Similarly, when the side surface of the battery cell 183 expands laterally due to abnormal expansion, the rear surface 29 deforms toward the front, the intermediate portion of the rear surface 29 abuts against the protruding portion 37, and the rear surface 29 partially The outflow part 40 is formed by opening in.

  As described above, when the outflow portion 40 is formed on the front surface 28 and the rear surface 29, the battery cooling fluid 19 described above flows out of the battery cooling portion 153 through the outflow portion 40. As a result, the battery cooling fluid 19 that has flowed out contacts the battery cell 182 and the battery cell 183, whereby the battery cell 182 and the battery cell 183 are cooled, and overheating is suppressed. Moreover, the battery cell 182 and the battery cell 183 can be further cooled by the heat of vaporization generated when the heated battery cooling fluid 19 evaporates.

  Further, even when the battery cell 182 and the battery cell 183 have flueed, the flue gas can flow through the path through which the battery cooling fluid 19 flows. Therefore, the path through which the battery cooling fluid 19 flows can be used as a smoke exhausting mechanism in an emergency. In this case, a dedicated mechanism for exhausting smoke can be eliminated, and the overall configuration of the battery module 10 can be simplified.

  With reference to FIG. 6, another configuration that opens battery cooling unit 15 in the event of an abnormality will be described. Here, an abnormal-time opening 39 is formed in the lower surface 35 of the battery cooling unit 15 above or in the vicinity of the smoke exhaust valve 38. The abnormal-time opening 39 is a part where the lower surface 35 is partially made weak, for example, a part where the lower surface 35 is partially thinned.

  By adopting such a configuration, the battery cooling fluid 19 can be discharged toward the battery cell 18 from the abnormal-time opening 39 in an abnormal time. Specifically, gas is generated from the smoke exhaust valve 38 disposed at the upper end of the battery cell 18 in an abnormal state. When the gas is generated, the generated gas is at a high pressure and a high temperature. Therefore, when such a gas is blown onto the fragile abnormal opening 39, the abnormal opening 39 opens to become an outflow site. When the abnormal-time opening 39 is opened, the battery cooling fluid 19 is ejected from the outflow portion toward the battery cell 18, the battery cell 18 is cooled by the battery cooling fluid 19, and overheating of the battery cell 18 is suppressed.

  Here, the protruding portion 37 shown in FIG. 5 and the abnormal-time opening 39 shown in FIG. 6 form an outflow portion for allowing the battery cooling fluid 19 to flow out toward the battery cell 18 in an abnormal time. It is an outflow site forming part. As the outflow site forming portion, either one of the projecting portion 37 and the abnormal-time opening 39 may be employed, or both may be employed in combination.

  With reference to FIG. 7, another configuration of the battery cooling unit 15 will be described. FIG. 7A is a cross-sectional view showing another configuration of the battery cooling section 15, and FIG. 7B is a cross-sectional view showing a case where the battery stack 14 has abnormally expanded in such a configuration.

  Referring to FIG. 7A, the lower part of the battery cell 181 etc. extends in the front-rear direction, and a slit 41 is formed as a gap between the battery cells 181 etc. below. Specifically, the slits 41 are provided between the battery cooling unit 151 and the battery cooling unit 152, between the battery cooling unit 152 and the battery cooling unit 153, and between the battery cooling unit 153 and the battery cooling unit 154, respectively. Is formed. The slit 41 is formed below the battery cell 181 and the like. As will be described later, the slit 41 is for allowing a predetermined amount of the battery cooling fluid 19 leaking from the battery cooling portion 151 or the like to leak out in the event of an abnormality.

  With reference to FIG. 7B, the operation at the time of abnormality will be described by taking the battery cell 183 as an example. When the battery cell 183 expands at the time of abnormality, the outflow part 40 is formed by opening the side surfaces of the battery cooling unit 152 and the battery cooling unit 153 as described with reference to FIG. From the outflow portion 40, the battery cooling fluid 19 that circulates inside the battery cooling unit 152 and the battery cooling unit 153 is ejected toward the battery cell 183. After being ejected, the battery cooling fluid 19 is filled between the battery cooling unit 152 and the battery cooling unit 153 and the side surface of the battery cell 182, and then flows out to the outside through the slit 41.

  Here, referring to FIG. 6 again, when the abnormal-time opening 39 is formed as the outflow portion, the battery cooling fluid 19 flowing out from the portion opening the abnormal-time opening 39 flows around the battery cell 18. After filling, it flows out to the outside through the slit 41 shown in FIG.

  Further, the flow rate of the battery cooling fluid 19 passing through the slit 41 can be set smaller than the flow rate of the battery cooling fluid 19 passing through the outflow portion 40. By doing in this way, the time which the battery cooling fluid 19 which flows out, and the battery cell 183 contact can be made more than fixed time, and the effect which prevents overheating and ignition of the battery cell 183 becomes large.

  A modification of the battery cooling unit 15 will be described in detail with reference to FIG. This figure is a perspective view of the battery cooling unit 15 as viewed from above. With reference to this figure, the overhang | projection part 42 is formed by making the lower end part of the main surface part 24 protrude ahead and back. Moreover, the slit 41 is formed by notching the front surface of the overhang | projection part 42 in groove shape. A plurality of slits 41 are formed. Similarly, a plurality of slits 41 are also formed on the rear surface of the overhanging portion 42 protruding rearward.

  With reference to the flowchart of FIG. 9, a control method for suppressing overheating of the battery stack 14 in the event of an abnormality will be described with reference to the above-described drawings.

  In step S10, first, the temperature sensor 11 constantly measures the temperature of the battery stack 14. The temperature sensor 11 transmits temperature data indicating the temperature of the battery stack 14 to the control unit 13.

  In step S11, the control unit 13 determines whether or not the temperature of the battery stack 14 measured by the temperature sensor 11 is equal to or higher than a preset first temperature. Here, 1st temperature is temperature higher than the temperature at the time of the battery stack 14 charging / discharging normally. Therefore, if the measured temperature of the battery stack 14 is equal to or higher than the first temperature, it is determined that the battery stack 14 is in an abnormal state.

  When the temperature of the battery stack 14 is lower than the first temperature, that is, when the battery stack 14 is charging / discharging normally and NO in step S11, the control unit 13 returns to step S10, and the battery stack 14 Continue temperature monitoring.

  On the other hand, when the temperature of the battery stack 14 is equal to or higher than the first temperature, the battery stack 14 is in an abnormal state and step S11 is YES, so the process proceeds to step S12.

  In step S <b> 12, the control unit 13 increases the discharge amount of the pump 12 and increases the flow rate of the battery cooling fluid 19 supplied to the battery cooling unit 15. Here, for example, the discharge amount of the pump 12 is increased beyond the normal use region. By doing so, the function of cooling the battery stack 14 is increased, and overheating of the battery stack 14 is suppressed. At this time, as shown in FIG. 5, the outflow portion 40 is formed by utilizing the phenomenon that the battery cell 182 and the like expand, and the battery cooling fluid 19 is supplied to the battery cell 182 and the like. Prevent overheating and fire spread.

  Further, the control unit 13 limits the power input / output to / from the battery stack 14. For example, the power input / output to / from the battery stack 14 is 0 kW. Thereby, the electric leakage and electric shock which can be solved at the time of abnormality can be suppressed.

  In step S13, the controller 13 determines whether or not the temperature of the battery stack 14 measured by the temperature sensor 11 is equal to or higher than a preset second temperature. The second temperature in this step is a temperature set higher than the first temperature described above. If the measured temperature of the battery stack 14 is equal to or higher than the second temperature, it is determined that the battery stack 14 is in an abnormal state.

  If the temperature of the battery stack 14 is lower than the second temperature, if NO in step S13, the control unit 13 returns to step S11 and continues monitoring and cooling of the battery stack 14.

  On the other hand, if the temperature of the battery stack 14 is equal to or higher than the second temperature, the battery stack 14 is in an abnormal state and step S13 is YES, so the process proceeds to step S14.

  In step S <b> 14, the control unit 13 further increases the discharge amount of the pump 12 to the maximum, and increases the flow rate of the battery cooling fluid 19 supplied to the battery cooling unit 15. By doing so, the function of cooling the battery stack 14 is further increased, and overheating and fire spread of the battery stack 14 are suppressed. Further, the control unit 13 limits the power input / output to / from the battery stack 14. For example, the power input / output to / from the battery stack 14 is 0 kW.

  As mentioned above, although embodiment of this invention was shown, this invention is not limited to the said embodiment.

DESCRIPTION OF SYMBOLS 10 Battery module 11 Temperature sensor 12 Pump 13 Control part 14 Battery stack 15 Battery cooling part 151 Battery cooling part 152 Battery cooling part 153 Battery cooling part 154 Battery cooling part 16 Motor 17 Radiator 18 Battery cell 181 Battery cell 182 Battery cell 183 Battery cell 184 Battery cell 19 Battery cooling fluid 20 Vehicle 22 Seat 23 Partition plate 24 Main surface portion 25 Projection portion 26 Injection port 27 Discharge port 28 Front surface 29 Rear surface 30 Left side surface 31 Right side surface 32 Lower surface 33 Upper surface 34 Front surface 35 Lower surface 36 Wall portion 37 Projection portion 38 Smoke Exhaust Valve 39 Opening 40 at Abnormality Outflow Portion 41 Slit 42 Overhang

Claims (9)

A battery stack having a plurality of battery cells;
A battery cooling unit disposed between the battery cells and forming a path through which a battery cooling fluid for cooling the battery cells flows; and
A battery module comprising: an outflow portion forming portion that forms an outflow portion in which the battery cooling fluid flows from the battery cooling portion toward the battery stack when the battery cell is in an abnormal state. The battery cooling unit includes a housing part, and a wall part formed in a wall shape inside the housing part,
2. The battery module according to claim 1, wherein the outflow portion forming portion is a protruding portion in which the wall portion is partially protruded toward the housing portion.   The said outflow part formation part is an opening part at the time of abnormality opened by the heat_generation | fever or pressure from the smoke exhaust valve of the said battery cell when the said battery cell is in the said abnormal state. Item 3. The battery module according to Item 2.   The said battery cooling part has the main surface part arrange | positioned between the said battery cells, and the protrusion part which protrudes to the side of the said battery cell, The any one of Claims 1-3 characterized by the above-mentioned. The battery module as described in.   5. The battery module according to claim 1, wherein a slit is formed as a gap between the battery cooling portions below the battery cell. 6.   6. The battery module according to claim 5, wherein a flow rate of the battery cooling fluid flowing out from the slit is made smaller than a flow rate of the battery cooling fluid flowing out from the outflow portion when an abnormality occurs. A pump for supplying the battery cooling fluid to the battery cooling section;
A temperature sensor for detecting the temperature of the battery stack;
A control unit that controls the discharge force of the pump based on the output of the temperature sensor,
The control unit increases the flow rate of the battery cooling fluid supplied to the battery cooling unit by the pump if the temperature of the battery stack detected by the temperature sensor is equal to or higher than a first temperature. The battery module according to any one of claims 1 to 6.   The battery module according to claim 7, wherein the controller limits charging / discharging of the battery stack when the temperature of the battery stack detected by the temperature sensor is equal to or higher than the first temperature. If the temperature of the battery stack detected by the temperature sensor is equal to or higher than a second temperature set higher than the first temperature, the control unit supplies the battery cooling fluid to the battery cooling unit by the pump The battery module according to claim 7 or 8, wherein the flow rate of the battery is further increased.

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