Battery cooling method

Abstract

To suppress the occurrence of seal-out at a joint portion of a part from which an electrode terminal extends.SOLUTION: In a laminated all-solid-state battery 10, a negative electrode terminal 1a and a positive electrode terminal 5a around which resin sheets 21, 22 are respectively wound are sandwiched between exterior members (laminate films) 20, and the exterior members 20 are joined by heat welding. The laminated all-solid-state battery 10 is in contact with a heat exchanger 30 via a heat conductive sheet 35. When a terminal part temperature Tb detected by a temperature sensor 23 provided at the negative electrode terminal 1a and the positive electrode terminal 5a is equal to or higher than a predetermined value T1, a flow rate control valve 211 is fully closed and a flow rate control valve 212 is fully opened. The cooling amount of a joint portion from which the negative electrode terminal 1a and the positive electrode terminal 5a extend increases; the temperature of the joint portion decreases; the deformation of the resin sheets 21, 22 is suppressed; and the unsealing of seal is suppressed.SELECTED DRAWING: Figure 3

Description

[Technical Field]

[0001] The present disclosure relates to a method for cooling a battery. [Background technology]

[0002] All-solid-state batteries using solid electrolytes are known. For example, Japanese Patent Application Laid-Open No. 2021-114373 (Patent Document 1) discloses a laminated all-solid-state battery that uses a laminated film with a heat-sealed (thermally fused) seal as an exterior member. In Patent Document 1, the moisture permeability of the seal is calculated based on the internal moisture content of a battery pack containing a laminated all-solid-state battery and the temperature of the seal. Then, when the moisture permeability of the seal is equal to or greater than a threshold, the seal is cooled. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Publication No. 2021-114373 Summary of the Invention [Problem to be solved by the invention]

[0004] In a laminated all-solid-state battery, an electrode terminal (electrode tab) extends from a seal (joint) of a laminate film (exterior member). The seal at the location where the electrode terminal extends is sealed by joining the laminate film so that it sandwiches the electrode terminal, so the seal is prone to coming loose at the seal (joint) of the electrode terminal. When the seal comes loose, it is called a seal-out, and air enters through the sealed-out portion. If the invading air contains moisture, the moisture reacts with the solid electrolyte, etc., generating gas. For example, if the all-solid-state battery is a sulfur-based all-solid-state battery, hydrogen sulfide is generated.

[0005] In particular, when the temperature near the electrode terminal becomes high, the seal portion (joint portion) at the portion where the electrode terminal extends is deformed, making seal-out more likely to occur.

[0006] An object of the present disclosure is to suppress the occurrence of seal-out at the joint where the electrode terminal extends. [Means for solving the problem]

[0007] (1) The presently disclosed method for cooling a battery includes a power generating element made of an all-solid-state battery laminate, and an exterior member made of a laminate film that houses the power generating element and whose outer periphery is joined by thermal welding to seal the power generating element, and in which electrode terminals of the power generating element extend from joints of the exterior member, and when a terminal temperature, which is the temperature of the joints from which the electrode terminals extend, is higher than a first predetermined value, the joints from which the electrode terminals extend are cooled.

[0008] According to this method, when the terminal temperature is higher than a first predetermined value and there is a possibility of seal-out occurring at the joint where the electrode terminal extends, the joint where the electrode terminal extends is cooled, thereby suppressing deformation of the joint where the electrode terminal extends and suppressing the occurrence of seal-out.

[0009] (2) The battery may be cooled by a liquid cooling method in which a heat medium flows through the flow paths of a heat exchanger. The cooling method may be such that, when the terminal temperature is higher than a first predetermined value, the flow rate of the heat medium in the flow path corresponding to the joint where the electrode terminal extends is increased to cool the joint, and when the terminal temperature falls below a second predetermined value that is smaller than the first predetermined value, the battery is cooled by the heat medium flowing through all the flow paths of the heat exchanger.

[0010] According to this method, the battery is cooled using a liquid cooling system. When the terminal temperature is higher than a first predetermined value, the flow rate of the heat transfer medium in the flow path corresponding to the joint where the electrode terminal extends is increased to cool the joint. As a result, if there is a possibility of seal-out occurring at the joint where the electrode terminal extends, the joint is cooled, which suppresses deformation of the joint where the electrode terminal extends and thus suppresses the occurrence of seal-out.

[0011] When the terminal temperature falls below a second predetermined value that is smaller than the first predetermined value, the battery is cooled by the heat medium flowing through all the flow paths of the heat exchanger, thereby allowing the battery to be cooled appropriately and suppressing battery degradation, etc.

[0012] (3) The battery may be cooled by air cooling, which may involve supplying cooling air to the joints from which the electrode terminals extend when the terminal temperature is higher than a first predetermined value.

[0013] According to this method, when the terminal temperature is higher than a first predetermined value, cooling air is supplied to the joint where the electrode terminal extends. As a result, if there is a possibility of seal-out occurring at the joint where the electrode terminal extends, the joint is cooled by the cooling air, which suppresses deformation of the joint where the electrode terminal extends and thus suppresses the occurrence of seal-out.

[0014] (4) A thermoplastic resin sheet may be disposed between the electrode terminal and the exterior member at the joint where the electrode terminal extends. The cooling method includes cooling the joint including the resin sheet when the temperature of the terminal is higher than a first predetermined value.

[0015] In order to improve the sealing performance (hermetic sealing) at the joint where the electrode terminal extends, a thermoplastic resin sheet is placed between the electrode terminal and the exterior member, and the exterior member is joined and sealed by thermal welding. If the temperature of the terminal portion becomes high, the resin sheet may deform, making the seal more likely to come loose. In this cooling method, when the temperature of the terminal portion is higher than a first predetermined value, the joint including the resin sheet is cooled. As a result, if there is a possibility of seal-out occurring at the joint where the electrode terminal extends, the joint including the resin sheet is cooled, which suppresses deformation of the resin sheet and makes it possible to suppress seal-out.

[0016] (5) The all-solid-state battery stack may be a sulfide-based all-solid-state battery.

[0017] According to this method, it is possible to suppress the generation of hydrogen sulfide due to seal-out. [Effects of the Invention]

[0018] According to the present disclosure, it is possible to suppress the occurrence of seal-out at the joint where the electrode terminal extends. [Brief explanation of the drawings]

[0019] [Figure 1] 1 is a diagram showing a schematic overall configuration of a vehicle equipped with a battery module according to an embodiment of the present invention; [Figure 2] 1A and 1B are diagrams illustrating a schematic configuration of a laminate-type all-solid-state battery 10 according to the present embodiment. [Figure 3] FIG. 1 is a diagram showing the relationship between a heat exchanger and a laminated-type all-solid-state battery. [Figure 4] 4 is a flowchart showing an example of a cooling control process executed by the ECU. [Figure 5] 10(A) and 10(B) are schematic diagrams illustrating a method for cooling a battery module in a modified example. [Figure 6] 10 is a flowchart showing an example of a cooling control process executed by an ECU in a modified example. DETAILED DESCRIPTION OF THE INVENTION

[0020] Hereinafter, embodiments of the present disclosure will be described in detail with reference to the drawings. In the drawings, the same or corresponding parts are designated by the same reference numerals, and description thereof will not be repeated.

[0021] FIG. 1 is a diagram schematically illustrating the overall configuration of a vehicle V equipped with a battery module 50 according to this embodiment. The vehicle V includes a battery module 50 that stores electric power for traveling. The vehicle V is configured to be able to travel using the electric power stored in the battery module 50. In this embodiment, the vehicle V may be an electric vehicle (BEV) that does not include an engine (internal combustion engine), or may be a hybrid vehicle (HEV) that includes an engine, or a plug-in hybrid vehicle (PHEV).

[0022] The vehicle V includes a control device (ECU: Electronic Control Unit) 300. The ECU 300 is configured to perform charging control, discharging control, and cooling control of the battery module 50. The ECU 300 includes a processor 301 and a memory 302. The processor 301 executes programs stored in the memory 302, thereby performing various controls in the ECU 300.

[0023] The vehicle V is equipped with a driving section including a PCU (Power Control Unit) and an MG (Motor Generator), not shown, and is configured to drive the MG using power stored in a battery module 50 to drive the vehicle V. The MG is configured to perform regenerative power generation and supply the generated power to the battery module 50. The battery module 50 is also configured to be externally charged using an external power source by a charging circuit not shown.

[0024] The battery module 50 is an assembled battery in which laminated all-solid-state batteries 10 are electrically connected in series. FIG. 2 is a diagram illustrating a schematic configuration of the laminated all-solid-state battery 10 according to the present embodiment. FIG. 2(A) is a top view (view A in FIG. 1) of the laminated all-solid-state battery 10. The laminated all-solid-state battery 10 is an all-solid-state battery that uses a laminate film as the exterior member 20, and a negative electrode terminal (negative electrode tab) 1a and a positive electrode terminal (positive electrode tab) 5a extend from the exterior member 20. The negative electrode terminal 1a and the positive electrode terminal 5a are "electrode terminals" in the present disclosure. The laminated film may be, for example, a pouch made of an aluminum laminated film, or may be a three-layer film with aluminum foil sandwiched between resin films. The resin film may contain, for example, PP (polypropylene), PET (polyethylene terephthalate), or the like.

[0025] FIG. 2(B) shows the all-solid-state battery laminate 15 housed in the exterior member 20, and shows the cross section BB of FIG. 2(A). The all-solid-state battery laminate 15 is composed of three all-solid-state battery elements 8, each of which is composed of an anode current collector layer 1, an anode active material layer 2, a solid electrolyte layer 3, a cathode active material layer 4, and a cathode current collector layer 5 stacked in this order, with the anode current collector layer 1 and the cathode current collector layer 5 shared and stacked in the reverse order. The anode current collector layer 1 is connected to the anode terminal 1a, and the cathode current collector layer 5 is connected to the cathode terminal 5a. The number of all-solid-state battery elements 8 included in the all-solid-state battery laminate 15 may be one or four or more. The insulating film 7 provides insulation between the all-solid-state battery laminate 15 and the exterior member (laminate film) 20. The all-solid-state battery laminate 15 or the all-solid-state battery element 8 corresponds to an example of a "power generating element" in the present disclosure.

[0026] The laminate-type all-solid-state battery 10 is a sulfide-based all-solid-state battery. In the present disclosure, a sulfide-based all-solid-state battery is one in which at least one of the material of the positive electrode active material layer 4 and the material of the solid electrolyte layer 3 contains a sulfur component. In this embodiment, the solid electrolyte layer 3 includes a sulfide-based solid electrolyte. For example, the sulfide-based solid electrolyte may be one made from phosphorus pentasulfide (P2S5) or lithium sulfide (Li2S) as a starting material. In this case, the positive electrode active material layer 4 may include, for example, lithium cobalt oxide, lithium nickel oxide, or lithium iron phosphate. When the solid electrolyte layer 3 is made of an oxide-based solid electrolyte, a sulfur-based positive electrode active material is used for the positive electrode active material layer 4. The sulfur-based positive electrode active material may be an organic sulfur compound or an inorganic sulfur compound. Note that both the solid electrolyte layer 3 and the positive electrode active material layer 4 may contain a sulfur component.

[0027] After the all-solid-state battery stack 15 is housed in an exterior member (laminate film) 20, the outer periphery (peripheral edge) of the exterior member 20 is joined by heat welding (thermal fusion) to seal the all-solid-state battery stack 15. This forms a joint (sealed portion) 20a. To improve the sealing between the negative electrode terminal 1a and the positive electrode terminal 5a and the exterior member 20, resin sheets 21 and 22 are provided to cover both the front and back surfaces of the negative electrode terminal 1a and the positive electrode terminal 5a. The resin sheets 21 and 22 are formed in strip shapes using a resin material such as PP or PE (polyethylene), and are wrapped around the negative electrode terminal 1a and the positive electrode terminal 5a. The negative electrode terminal 1a and the positive electrode terminal 5a wrapped with the resin sheets 21 and 22 are then sandwiched between the exterior member 20, and the exterior member 20 is joined by heat welding. The joints where the negative electrode terminal 1a and the positive electrode terminal 5a extend may be joined by thermal welding using ultrasonic welding with a horn, and the other joints may be joined by thermal welding with a heat bar.

[0028] Referring to FIG. 1 , a battery module 50 is configured by stacking a plurality of laminate-type all-solid-state batteries 10 and electrically connecting them in series (bus bars are not shown). The battery module 50 is in contact with a heat exchanger (cooling plate) 30 via a thermally conductive sheet 35. In this embodiment, the battery module 50 can be cooled by a cooling device 100. The cooling device 100 is configured with a refrigeration cycle 150, a chiller 160, and a cooling circuit 200. The refrigeration cycle 150 is a refrigeration cycle for air conditioning of a vehicle V, and includes a compressor 151, a condenser 152, an electric expansion valve 153, an evaporator 154, an evaporative pressure regulator (EPR) 155, and an electric expansion valve 156. The chiller 160 is connected to the refrigeration cycle 150 and the cooling circuit 200, and performs heat exchange between the refrigerant of the refrigeration cycle 150 and the heat medium of the cooling circuit 200. The heat medium may be, for example, an insulating antifreeze liquid. The cooling circuit 200 includes a pump 210, and circulates the heat medium that flows into the heat exchanger (cooling plate) 30 through a heat medium passage 201 within the cooling circuit 200. The refrigeration cycle 150 (including the compressor 151 and various valves) and the pump 210 are controlled by an ECU 300.

[0029] The heat exchanger (cooling plate) 30 exchanges heat with the battery modules 50 and cools the battery modules 50 using a heat medium. In this embodiment, the heat exchanger 30 is composed of a multi-hole pipe 31 in which a plurality of heat medium flow paths Ch are formed, and a plurality of headers (manifolds) 204 to 207, and the multi-hole pipe 31 is made of, for example, aluminum or an aluminum alloy and is manufactured using extrusion molding.

[0030] The heat medium discharged from the chiller 160 flows through a heat medium passage 201 and branches into a heat medium passage 202 and a heat medium passage 203. A flow control valve 211 is provided in the heat medium passage 202, and a flow control valve 212 is provided in the heat medium passage 203. The heat medium that passes through the flow control valve 211 flows into a header 204, flows through a heat medium flow path Ch of the multi-hole pipe 31, exchanges heat with the battery module 50, and flows into a header 205. The heat medium that passes through the flow control valve 212 flows into a header 206, flows through a heat medium flow path Ch of the multi-hole pipe 31, exchanges heat with the battery module 50, and flows into a header 207. The heat medium that flows into the headers 205 and 207 returns to the pump 210 via a heat medium passage 208.

[0031] FIG. 3 is a diagram showing the relationship between the heat exchanger (cooling plate) 30 and the laminate-type all-solid-state battery 10 (battery module 50). FIG. 3 is a view seen from A in FIG. 1. The heat medium that has passed through the flow control valve 212 and flowed into the header 206 flows through the heat medium flow path Ch located below the negative electrode terminal 1a, the positive electrode terminal 5a, and the resin sheets 21 and 22 in the figure. The joints from which the negative electrode terminal 1a and the positive electrode terminal 5a extend are cooled by the heat medium that has flowed into the header 206. In addition, the heat medium that has passed through the flow control valve 211 and flowed into the header 204 flows through the heat medium flow path Ch at a position other than below the negative electrode terminal 1a, the positive electrode terminal 5a, and the resin sheets 21 and 22 in the figure.

[0032] 1, the monitoring unit 40 includes various sensors that detect the state of the battery module 50 (for example, voltage, current, and temperature), and outputs the detection results to the ECU 300. Also, as shown in FIGS. 2 and 3, a temperature sensor 23 is provided on the negative electrode terminal 1a and the positive electrode terminal 5a of the laminated-type all-solid-state battery 10 (more specifically, on the resin sheets 21, 22). The temperature sensor 23 detects a terminal temperature Tb, which is the temperature of the negative electrode terminal 1a and the positive electrode terminal 5a, and outputs the detection result to the ECU 300.

[0033] In a laminated all-solid-state battery 10, there is a concern that air may infiltrate through a sealed portion (joint) of an exterior member 20 (laminate film). If the infiltrated air contains moisture, the moisture may react with a sulfur component contained in the solid electrolyte layer 3 or the positive electrode active material layer 4, resulting in the generation and release of hydrogen sulfide. In particular, in a laminated all-solid-state battery 10, the negative electrode terminal 1a and the positive electrode terminal 5a (electrode tabs) extend from a sealed portion (joint) of the exterior member 20, and the exterior member (laminate film) 20 is joined and sealed so as to sandwich the negative electrode terminal 1a and the positive electrode terminal 5a. Therefore, at high temperatures, the sealed portion (joint) may deform, making the seal more likely to come loose, and there is a concern that a seal-out may occur.

[0034] In this embodiment, in order to improve the sealing performance between the negative electrode terminal 1a and the positive electrode terminal 5a and the exterior member 20, resin sheets 21 and 22 are wrapped around the negative electrode terminal 1a and the positive electrode terminal 5a, and the negative electrode terminal 1a and the positive electrode terminal 5a are sandwiched between the negative electrode terminal 1a and the positive electrode terminal 5a and the exterior member 20 is thermally welded to the exterior member 20. Therefore, if the joints where the negative electrode terminal 1a and the positive electrode terminal 5a extend become hot, the resin sheets 21 and 22 may deform, and the seal may become easily loosened.

[0035] In this embodiment, when the joints from which the negative electrode terminal 1a and the positive electrode terminal 5a extend become too hot and there is a possibility that the seal may come loose, the joints are cooled to prevent seal-out from occurring. Fig. 4 is a flowchart showing an example of the cooling control process executed by the ECU 300. This flowchart is repeatedly processed at predetermined intervals when the power switch of the vehicle V is ON and while the battery module 50 is being externally charged.

[0036] In step (hereinafter, step will be abbreviated as "S") 10, the terminal temperatures Tb are acquired from the detection signals of the temperature sensors 23 provided in the laminated-type all-solid-state battery 10 (battery module 50), and the highest temperature MAX[Tb] among the acquired terminal temperatures Tb is calculated.

[0037] In the subsequent S11, it is determined whether the maximum temperature MAX[Tb] is equal to or higher than a predetermined value T1. The predetermined value T1 is a value set in advance through experiments or the like. If the terminal part temperature Tb exceeds the predetermined value T1 for a predetermined period of time, there is a possibility that the sealing of the joint where the negative terminal 1a and the positive terminal 5a extend will be loosened. The predetermined value T1 corresponds to the "first predetermined value" of the present disclosure. If the maximum temperature MAX[Tb] is equal to or higher than the predetermined value T1 (MAX[Tb]≧T1), an affirmative determination is made and the process proceeds to S12. If the maximum temperature MAX[Tb] is less than the predetermined value T1 (MAX[Tb]<T1), a negative determination is made and the process proceeds to S13.

[0038] In S12, terminal enhanced cooling is executed and the current routine is terminated. The default (initial setting) in the cooling control is normal cooling, which will be described later. If the currently executed cooling control is normal cooling, it can be switched to terminal enhanced cooling. If the currently executed cooling control is terminal enhanced cooling, the terminal enhanced cooling is continued. In terminal enhanced cooling, the flow control valve 211 is fully closed and the flow control valve 212 is fully opened. As a result, the entire amount of the heat transfer medium discharged from the chiller 160 flows into the header 206 and flows through the heat transfer medium flow path Ch located below the negative terminal 1a, the positive terminal 5a, and the resin sheets 21 and 22 in the drawing (see FIG. 3). Thereby, the cooling amount (heat exchange amount) of the joint where the negative terminal 1a and the positive terminal 5a extend increases, the temperature of the joint decreases, the deformation of the resin sheets 21 and 22 is suppressed, and the loosening of the seal can be suppressed.

[0039] In S13, it is determined whether the maximum temperature MAX[Tb] is equal to or less than a predetermined value T2. The predetermined value T2 is a value that is set in advance through experiments, etc., and if the terminal temperature Tb is equal to or less than the predetermined value T2, the joints where the negative electrode terminal 1a and the positive electrode terminal 5a extend and the resin sheets 21 and 22 can be kept sealed without being deformed. The predetermined value T2 is smaller than the predetermined value T1. The predetermined value T2 corresponds to the "second predetermined value" in this disclosure. If the maximum temperature MAX[Tb] is equal to or less than the predetermined value T2 (MAX[Tb]≦T2), a positive determination is made and the process proceeds to S14. If the maximum temperature MAX[Tb] is higher than the predetermined value T2 (MAX[Tb]>T2), the current routine is terminated (the current cooling control mode (terminal enhanced cooling / normal cooling) is continued).

[0040] In S14, normal cooling is performed, and this routine ends. If the currently executed cooling control is terminal enhanced cooling, it is switched to normal cooling. If the currently executed cooling control is normal cooling, normal cooling is continued. In normal cooling, the opening of the flow control valves 211, 212 is controlled so that the temperature of the battery module 50 (laminate-type all-solid-state battery 10) detected by the monitoring unit 40 falls within a set range. This allows the temperature of the battery module 50 to be maintained at an appropriate temperature by the heat medium flowing through all the heat medium flow paths Ch of the heat exchanger 30 (multi-hole pipe 31).

[0041] According to this embodiment, when the maximum temperature MAX[Tb] is equal to or higher than a predetermined value T1, the amount of cooling (amount of heat exchange) at the joint where the negative electrode terminal 1a and the positive electrode terminal 5a extend is increased to cool the joint, thereby suppressing deformation of the joint and preventing seal-out, thereby preventing hydrogen sulfide from being released from the laminate-type all-solid-state battery 10, which is a sulfide-based solid state battery.

[0042] In the present embodiment, when the maximum temperature MAX[Tb] is equal to or lower than a predetermined value T2, the battery module 50 (laminate-type all-solid-state batteries 10) is cooled by the heat medium flowing through all the heat medium flow paths Ch of the heat exchanger 30 (multi-hole pipe 31). This allows the laminate-type all-solid-state batteries 10 to be appropriately cooled, and battery degradation and the like can be suppressed.

[0043] (Variation) FIG. 5 is a schematic diagram illustrating a cooling method for a battery module 50 in a modified example. In the modified example, the battery module 50 (laminate-type all-solid-state battery 10) is cooled by air cooling. In the modified example, as shown in FIG. 5(A), a plurality of laminate-type all-solid-state batteries 10 are stacked in the vertical direction in the figure and electrically connected in series to form the battery module 50. In FIG. 5, bus bars are not shown, and FIG. 5(A) shows a cross-sectional view of the laminate-type all-solid-state battery 10. Note that FIG. 5(B) is a top view of the battery module 50.

[0044] In the modified example, a branch cooling air passage 510 is arranged at a position facing the negative electrode terminal 1a, positive electrode terminal 5a, and resin sheets 21, 22 of each laminated type all-solid-state battery 10. As shown in Fig. 5, the branch cooling air passage 510 branches off from the cooling air passage 500 and extends to a position facing the negative electrode terminal 1a, positive electrode terminal 5a, and resin sheets 21, 22 of each laminated type all-solid-state battery 10. When the cooling fan 600 is driven, cooling air is introduced into the branch cooling air passage 510 via the cooling air passage 500.

[0045] The branch cooling air passage 510 is provided with blowout holes 511 that supply cooling air toward the joints from which the negative electrode terminals 1a and positive electrode terminals 5a of the laminated all-solid-state batteries 10 extend. As a result, when cooling air is supplied (blown) from the blowout holes 511 to the joints, the joints are cooled and the temperature of the joints decreases.

[0046] 6 is a flowchart showing an example of the cooling control process executed by the ECU in a modified example. This flowchart is also repeatedly processed at predetermined intervals when the power switch of the vehicle V is ON and during external charging of the battery module 50. In FIG. 6, S10, S11, and S13 are the same processes as those in the flowchart of FIG. 5.

[0047] If the maximum temperature MAX[Tb] is equal to or greater than the predetermined value T1 and a positive determination is made in S11, the cooling fan 600 is driven in S21, and cooling air is supplied from the air outlets 511. The cooling air supplied from the air outlets 511 cools the joints from which the negative electrode terminals 1a and positive electrode terminals 5a of each laminated-type all-solid-state battery 10 extend. Note that the default (initial setting) for cooling control in the modified example is that the cooling fan 600 is stopped. If the cooling fan 600 is currently stopped, the cooling fan 600 is driven and the current routine is terminated. If the cooling fan 600 is currently driven, the cooling fan 600 continues to be driven and the current routine is terminated.

[0048] If the maximum temperature MAX[Tb] is equal to or lower than the predetermined value T2 and a positive determination is made in S13, the driving of the cooling fan 600 is stopped in S21, and the current routine is terminated. If the maximum temperature MAX[Tb] is higher than the predetermined value T2 and a negative determination is made in S13, the current mode of the cooling fan 600 (driving / stopping the cooling fan 600) is continued, and the current routine is terminated.

[0049] According to this modification, when the maximum temperature MAX[Tb] is equal to or greater than a predetermined value T1, cooling air is supplied to the joint where the negative electrode terminal 1a and the positive electrode terminal 5a extend to cool the joint, thereby suppressing deformation of the joint and preventing seal-out. Furthermore, when the maximum temperature MAX[Tb] is equal to or less than a predetermined value T2, the supply of cooling air is stopped, thereby preventing the joint from becoming overcooled.

[0050] In the above embodiment, the maximum temperature MAX[Tb] is compared with the predetermined values ​​T1 and T2. The ECU 300 may calculate an average value of the terminal temperatures Tb detected by each temperature sensor 23 and compare this average value with the predetermined values ​​T1 and T2.

[0051] In the above embodiment, the terminal temperature Tb detected by the temperature sensor 23 is used, but the temperature of the junction where the negative electrode terminal 1a and the positive electrode terminal 5a extend may be acquired (estimated) by other means. For example, the internal resistance of the laminated type all-solid-state battery 10 is obtained by the monitoring unit 40. Then, the temperature of the junction may be estimated based on the input / output current values ​​and the internal resistance of the laminated type all-solid-state battery 10. In this case, the temperature of the junction may be estimated taking into account the temperature of the battery module 50 (laminated type all-solid-state battery 10) detected by the monitoring unit 40.

[0052] In the above embodiment, an example has been described in which the battery module 50 is mounted on the vehicle V. The battery module 50 may also be a stationary power storage device.

[0053] The embodiments disclosed herein should be considered to be illustrative in all respects and not restrictive. The scope of the present disclosure is defined by the claims, not by the description of the above embodiments, and is intended to include all modifications within the meaning and scope of the claims. [Explanation of symbols]

[0054] 1 negative electrode current collector layer, 1a negative electrode terminal, 2 negative electrode active material layer, 3 solid electrolyte layer, 4 positive electrode active material layer, 5 positive electrode current collector layer, 5a positive electrode terminal, 7 insulating film, 8 all-solid-state battery element, 10 laminated all-solid-state battery, 15 all-solid-state battery laminate, 20 exterior member (laminate film), 20a joint (sealing portion), 21, 22 resin sheet, 23 temperature sensor, 30 heat exchanger, 31 multi-hole pipe, 35 thermal conduction sheet, 40 monitoring unit, 50 battery module, 100 cooling device, 150 refrigeration cycle, 151 compressor, 152 condenser, 153, 156 electric expansion valve, 154 evaporator, 155 EPR, 160 chiller, 200 cooling circuit, 201, 202, 203, 208 Heat transfer medium passage, 204, 205, 206, 207 header, 210 pump, 211, 212 flow control valve, 300 ECU, 301 processor, 302 memory, 500 cooling air passage, 510 branch cooling air passage, 511 blowing hole, 600 cooling fan, Ch heat transfer medium flow path, V vehicle.

Claims

1. a power generation element made of an all-solid-state battery laminate; an exterior member made of a laminate film that houses the power generating element and has a peripheral portion joined by thermal welding to seal the power generating element; A battery cooling method, wherein an electrode terminal of the power generating element extends from a joint portion of the exterior member, cooling the joint portion from which the electrode terminal extends when a terminal portion temperature, which is a temperature of the joint portion from which the electrode terminal extends, is higher than a first predetermined value; The cooling method is an air-cooling method, in which cooling air is supplied to the joint portion from which the electrode terminal extends.

2. a thermoplastic resin sheet is disposed between the electrode terminal and the exterior member at the joint portion from which the electrode terminal extends, The battery cooling method according to claim 1 , wherein the joining portion including the resin sheet is cooled.

3. The battery cooling method according to claim 2 , wherein the all-solid-state battery stack is a sulfide-based all-solid-state battery.

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