Battery temperature control system

Abstract

To prevent a limitation of output of a battery due to a local decreasing of a temperature of the battery, and prevent the battery from being deteriorated due to a local increasing of the temperature of the battery.SOLUTION: A battery temperature control system 1 includes: a battery 3; a cooling device 4 that cools the battery 3; a heating device 5 that heats the battery 3; a battery ECU 6 that acquires the temperature of the battery 3; and a temperature control part 7 that controls the cooling device 4 and the heating device 5. The temperature control part 7 is configured to be capable of switching between a cooling state in which the cooling device 4 is in an operating state and the heating device 5 is in a non-operating state, a heating state in which the cooling device 4 is in the non-operating state and the heating device 5 is in the operating state, and a stop state in which the cooling device 4 is in the non-operating state and the heating device 5 is in the non-operating state. The temperature control part 7 switches between the cooling state and the heating state at least once when bringing the temperature of the battery 3 close to a target temperature.SELECTED DRAWING: Figure 4

Description

[Technical Field]

[0001] The present invention relates to a battery temperature regulation system. [Background technology]

[0002] In recent years, efforts to realize a low-carbon or carbon-free society have become more active, and research and development into electrification technologies is being conducted in order to reduce CO2 emissions and improve energy efficiency in vehicles.

[0003] Batteries play an important role in electrification technology, and battery temperature control is performed to maintain the battery temperature within a desired temperature range in order to prevent battery output restrictions and deterioration.

[0004] For example, Patent Document 1 discloses a system that estimates the maximum temperature inside a cell in a battery module composed of multiple cells, and controls the charging / discharging current of the battery module or the cooling of the battery module so that the estimated maximum temperature does not exceed an upper limit temperature during charging / discharging of the battery module. [Prior art documents] [Patent documents]

[0005] [Patent Document 1] International Publication No. 2019 / 244489 Summary of the Invention [Problem to be solved by the invention]

[0006] However, when the battery module is cooled so that the maximum temperature does not exceed the upper limit temperature, the minimum temperature of the battery module may become too low, limiting the battery output. In particular, recent high-capacity laminate cells have large electrode body areas, and the temperature distribution within the cell tends to become large when cooling, heating, or applying a large current.

[0007] The present invention provides a battery temperature regulation system that can bring the temperature of the battery closer to a target temperature while eliminating temperature differences inside the battery. [Means for solving the problem]

[0008] The present invention provides A battery, a cooling unit that cools the battery; a heating unit that heats the battery; a temperature acquisition unit that acquires the temperature of the battery; A battery temperature control system including a temperature control control unit that controls the cooling unit and the heating unit, The temperature adjustment control unit a cooling state in which the cooling unit is in an operating state and the heating unit is in an inoperable state; a heating state in which the cooling unit is in an inactive state and the heating unit is in an active state; a stop state in which the cooling unit is in an inactive state and the heating unit is in an inactive state; When the temperature of the battery is brought closer to the target temperature, the cooling state and the heating state are switched at least once. [Effects of the Invention]

[0009] According to the present invention, the battery temperature can be brought closer to a target temperature while eliminating temperature differences inside the battery, thereby preventing a local drop in the battery temperature that would limit battery output and a local increase in the battery temperature that would cause battery deterioration. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a block diagram of a battery temperature adjustment system 1 according to one embodiment of the present invention. [Figure 2] FIG. 2 is a schematic diagram illustrating the temperature inside the battery 3. [Figure 3]1A and 1B are graphs showing (a) the temperature inside the battery and (b) the permitted output of the battery in a cooling mode in which the battery is cooled by a conventional battery temperature regulation system. [Figure 4] 1A is a graph showing the temperature inside the battery, FIG. 1B is a graph showing the water temperature, and FIG. 1C is a graph showing the permitted output of the battery in a cooling mode for cooling the battery 3 of the battery temperature adjustment system 1 of the present embodiment. [Figure 5] These figures show graphs of the temperature inside the battery, the permitted output of the battery, and the water temperature in three more specific modes: (a) cooling priority mode, (b) normal cooling mode, and (c) output priority mode in the cooling mode in which the battery temperature control system 1 cools the battery 3. [Figure 6] 6 is a flowchart (part 1) showing a procedure for executing the cooling mode described in FIG. 5. [Figure 7] 6 is a flowchart (part 2) showing the procedure for executing the cooling mode described in FIG. 5. [Figure 8] FIG. 10 is a graph showing the temperature inside the battery in a heating mode in which the battery is heated by the conventional battery temperature regulation system. [Figure 9] 1A and 1B are diagrams showing a graph of the temperature inside the battery and a graph of the water temperature in a heating mode in which the battery 3 is heated in the battery temperature adjustment system 1 of the present embodiment. [Figure 10] These figures show graphs of the temperature inside the battery and the water temperature in two more specific modes in the heating mode in which the battery temperature control system 1 heats the battery 3: (a) heating priority mode and (b) active protection mode. [Figure 11] 11 is a flowchart showing a procedure for executing the heating mode described in FIG. 10. DETAILED DESCRIPTION OF THE INVENTION

[0011] DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A battery temperature control system according to an embodiment of the present invention will now be described with reference to the accompanying drawings.

[0012] FIG. 1 is a block diagram of a battery temperature control system 1 according to one embodiment of the present invention. The battery temperature control system 1 includes a control unit 2, a battery 3, a cooling device 4, a heating device 5, an EWP (Electric Water Pump) 8, and a user interface 9. The battery temperature control system 1 is installed in, for example, an electrically powered vehicle, and is a system that controls the temperature of a battery, which is a power source. The battery 3, the cooling device 4, the heating device 5, and the EWP 8 are arranged in a temperature control circuit 12 through which a refrigerant circulates. Inside the battery 3, a water jacket 11 (see FIG. 2) connected to the temperature control circuit 12 is configured to be in direct or indirect contact with one surface of the battery 3 and to be able to exchange heat with the battery 3.

[0013] The control unit 2 is a computer that has, for example, a processor that performs various calculations, a storage unit that has a non-transitory storage medium that stores various information, an input / output unit that controls input and output of data between the inside and outside of the control unit 2, and the like (all not shown), and that controls the entire battery temperature adjustment system 1. The control unit 2 includes a battery ECU (Electronic Control Unit) 6 and a temperature adjustment control unit 7.

[0014] The battery 3 includes multiple cells and supplies power to drive the vehicle. The cells are, for example, laminated cells made of solid-state batteries. The laminated cells have a positive electrode connected to a positive electrode tab, a negative electrode connected to a negative electrode tab, a solid electrolyte disposed between the positive and negative electrodes, and a laminated film that houses them. Charging and discharging are performed by the exchange of lithium ions between the positive and negative electrodes via the solid electrolyte. The cooling device 4 functions as a cooling unit that cools the battery 3 to prevent the temperature of the battery 3 from rising. The heating device 5 functions as a heating unit that heats the battery 3 to prevent the battery output from being limited. The EWP 8 is a so-called electric water pump that circulates refrigerant around the battery 3. The user interface 9 is an interface device including switches, buttons, a touch panel, and the like that allows a user (e.g., the vehicle driver) to input operations into the battery temperature control system 1.

[0015] As will be described later, the battery ECU 6 of the control unit 2 functions as a temperature acquisition unit that acquires the temperature of the battery 3. The battery ECU 6 can also function as an output control unit that controls the output of the battery 3. The temperature adjustment control unit 7 receives temperature information of the battery 3 from the battery ECU 6, and controls the cooling device 4 and the heating device 5 to control the temperature of the battery 3.

[0016] 2 is a schematic diagram illustrating the temperature inside the battery 3, specifically the temperature distribution of each cell constituting the battery 3. In this embodiment, a water jacket 11 connected to a temperature control circuit 12 is in indirect contact with the underside of the battery 3 (cell) via a heat transfer material 13.

[0017] In the case of cooling the battery 3, when the refrigerant circulates through the water jacket 11, the temperature of the battery lower region (cell lower region) 31 close to the water jacket 11 tends to decrease, but the temperature of the battery upper region (cell upper region) 32 far from the water jacket 11 tends to decrease, resulting in a temperature distribution within the battery. From this perspective, the battery ECU 6 acquires the temperature of at least one side of the battery 3 (the lower side in this figure) and the temperature of the opposite side (the upper side in this figure), and performs temperature control taking into account the temperature distribution within the battery.

[0018] Furthermore, since the battery ECU 6 determines the allowable power by referring to the lowest temperature of the battery 3 during normal use, the more temperature distribution occurs within the battery, the more limited the usable power becomes, making it more difficult to fully utilize the battery performance.

[0019] When cooling the battery 3 so that the maximum temperature does not exceed the upper limit temperature, the minimum temperature of the battery 3 may become too low, limiting the output of the battery 3. In particular, the high-capacity laminated cells that have been introduced in recent years have a large electrode area, and the temperature distribution within the battery tends to become larger when cooling, heating, or when a large current is applied. In addition, in the case of all-solid-state batteries, the temperature distribution within the battery tends to become even larger due to their characteristics such as a high upper limit temperature for use. In order to efficiently use the battery, it is necessary to reduce this temperature distribution.

[0020] For this reason, in this embodiment, the temperature adjustment control unit 7 is capable of switching between a cooling state in which the cooling device 4 is in an operating state and the heating device 5 is in an inoperating state, a heating state in which the cooling device 4 is in an inoperating state and the heating device 5 is in an operating state, and a stop state in which the cooling device 4 is in an inoperating state and the heating device 5 is in an inoperating state. The temperature adjustment control unit 7 switches between the cooling state and the heating state at least once, and preferably multiple times, when bringing the temperature of the battery 3 closer to the target temperature. Specific aspects of the control will be described below.

[0021] Figure 3 shows (a) a graph of the battery internal temperature and (b) a graph of the permitted output in the cooling mode for cooling the battery of a conventional battery temperature control system. Figure 3(a) shows the time changes in the water temperature (refrigerant temperature), the minimum battery internal temperature Tmin, and the maximum battery internal temperature Tmax, relative to the target temperature of the battery 3, which is a constant control target. The maximum battery internal temperature Tmax, which is the temperature near the upper battery region 32, remains above the target temperature even over time. On the other hand, the minimum battery internal temperature Tmin, which is the temperature near the lower battery region 31, falls below the target temperature over time.

[0022] When the battery ECU 6 acquires the minimum internal battery temperature Tmin and the maximum internal battery temperature Tmax of the battery 3, it refers to the minimum internal battery temperature Tmin to determine the permitted power of the battery 3. Therefore, as shown in (b) of Figure 3, when the minimum internal battery temperature Tmin falls below the target temperature, the battery ECU 6 limits the permitted output of the battery 3, which limits the available power.

[0023] On the other hand, FIG. 4 is a diagram showing (a) a graph of the temperature inside the battery, (b) a graph of the water temperature, and (c) a graph of the permitted output in the cooling mode for cooling the battery 3 of the battery temperature adjustment system 1 of this embodiment.

[0024] The battery ECU 6 acquires the lower battery temperature Td in the lower battery area 31 and the upper battery temperature Tu in the upper battery area 32, and calculates the maximum battery internal temperature Tmax and the minimum battery internal temperature Tmin. Note that the method of calculating the maximum battery internal temperature Tmax and the minimum battery internal temperature Tmin is not particularly limited, and the maximum temperature among the temperatures measured at multiple points may be set as the maximum battery internal temperature Tmax and the minimum battery internal temperature Tmin, or the average of the temperatures at multiple points on the higher temperature side may be set as the maximum battery internal temperature Tmax and the average of the temperatures at multiple points on the lower temperature side may be set as the minimum battery internal temperature Tmin, or they may be calculated using a predetermined formula based on the upper battery temperature and the lower battery temperature.

[0025] The temperature adjustment control unit 7 refers to the minimum internal battery temperature Tmin and maximum internal battery temperature Tmax of the battery 3, and switches between the cooling state, the heating state, and the stopped state as described above.

[0026] When cooling the battery 3, the temperature adjustment control unit 7 selects a cooling state in which the cooling device 4 is in an operating state and the heating device 5 is in an inoperating state. In the cooling state, the temperature Td at the bottom of the battery (the minimum temperature Tmin in the battery) and the temperature Tu at the top of the battery (the maximum temperature Tmax in the battery) decrease. As shown in FIG. 4(a), when the temperature Td at the bottom of the battery (the minimum temperature Tmin in the battery) falls below the target temperature (P1), the battery ECU 6 limits the permitted output of the battery 3 (P2), as shown in FIG. 4(c).

[0027] When a predetermined time has elapsed as the upper battery temperature Tu (maximum battery internal temperature Tmax) decreases, the temperature adjustment control unit 7 selects a heating mode in which the cooling device 4 is deactivated and the heating device 5 is activated. As a result, the water temperature starts to rise (P3) as shown in FIG. 4(b), and the minimum battery internal temperature Tmin starts to rise as the lower battery temperature Td in the lower battery region 31 near the water jacket 11 rises (P4). When the lower battery temperature Td (minimum battery internal temperature Tmin) exceeds the target temperature (P5), the battery ECU 6 releases the restriction on the permitted output of the battery 3 (P6).

[0028] After a predetermined time has elapsed in the heating state, the lower battery temperature Td greatly exceeds the target temperature (P7). The temperature control unit 7 then transitions to a cooling state, activating the cooling device 4 and deactivating the heating device 5. This causes the water temperature to begin to drop (P8), as shown in FIG. 4(b), and the lower battery temperature Td also drops. When the lower battery temperature Td (the minimum battery internal temperature Tmin) falls below the target temperature (P9), the battery ECU 6 limits the permitted output of the battery 3 (P10), as shown in FIG. 4(c).

[0029] In this way, in an environment where the output of battery 3 is controlled based on the minimum internal battery temperature Tmin of battery 3, by bringing the temperature of battery 3 closer to the target temperature while eliminating the temperature difference inside battery 3, it is possible to prevent the temperature of battery 3 from becoming locally low and limiting the output of battery 3.

[0030] Figure 5 shows graphs of the temperature inside the battery, the permitted output, and the water temperature in each of three more specific modes in the cooling mode in which the battery temperature control system 1 cools the battery 3: (a) cooling priority mode, (b) normal cooling mode, and (c) output priority mode.

[0031] In the cooling priority mode of FIG. 5(a), the cooling state is switched to the heating state at the following timing, for example.

[0032] The timing when the operation time of the cooling device 4 has elapsed for a predetermined period of time. The timing when the permitted output of battery 3 reaches the specified output (or less). The time when the temperature difference ΔT (ΔT = Td - Tu, hereinafter the same) obtained by subtracting the upper battery temperature Tu from the lower battery temperature Td becomes equal to or less than the specified allowable temperature difference T1 during cooling (ΔT ≦ T1).

[0033] The changeover from the heating state to the cooling state is performed, for example, at the following timing.

[0034] The time when the temperature difference ΔT becomes zero (ΔT=0)

[0035] In this mode, the maximum internal battery temperature Tmax reaches the target temperature in a short time. This allows for pre-cooling in preparation for short-time rapid charging. On the other hand, the output limit is increased until the maximum internal battery temperature Tmax reaches the target temperature.

[0036] In the normal cooling mode of FIG. 5(b), the cooling state is switched to the heating state at the following timing, for example.

[0037] The timing when the operation time of the cooling device 4 has elapsed for a predetermined period of time. - The timing when the permitted output reaches the specified output (or less) The timing when the temperature difference ΔT becomes equal to or less than the specified allowable temperature difference T1 during cooling (ΔT≦T1)

[0038] The changeover from the heating state to the cooling state is performed, for example, at the following timing.

[0039] The timing when the operating time of the heating device 5 has elapsed for a predetermined period of time. The timing when the temperature difference ΔT becomes larger than the allowable temperature difference T2 during heating (ΔT>T2)

[0040] In this mode, the maximum battery internal temperature Tmax reaches the target temperature in a reasonable amount of time. Until the target temperature is reached, the output limit amount is limited to a certain extent.

[0041] In the output priority mode of FIG. 5(c), the cooling state is switched to the heating state at the following timing, for example.

[0042] The timing when the temperature difference ΔT becomes equal to or less than the specified allowable temperature difference T1 during cooling (ΔT≦T1)

[0043] The changeover from the heating state to the cooling state is performed, for example, at the following timing.

[0044] The time when the temperature difference ΔT becomes zero (ΔT=0)

[0045] This mode minimizes the area where the output of the battery 3 is limited, making it possible to apply it to situations where cooling is required while maintaining a constant output, such as during normal driving. The time required for the maximum internal battery temperature Tmax to reach the target temperature becomes longer.

[0046] In this embodiment, the battery ECU 6 acquires temperatures at multiple locations of the battery 3 to acquire the minimum battery internal temperature Tmin and the maximum battery internal temperature Tmax. The temperature adjustment control unit 7 can then switch between the cooling state and the heating state based on the temperature difference ΔT between a high-side temperature such as the maximum battery internal temperature Tmax and a low-side temperature such as the minimum battery internal temperature Tmin. This makes it possible to prevent the temperature difference between the high-side temperature and the low-side temperature of the battery 3 from becoming greater than a predetermined value.

[0047] Furthermore, the temperature control unit 7 may switch between the cooling state and the heating state based on the operating time of the cooling device 4 or the heating device 5. This facilitates control while preventing the temperature difference between the high-side temperature and the low-side temperature of the battery 3 from exceeding a predetermined value.

[0048] The temperature control unit 7 is configured to be able to control the temperature of the battery 3 in a plurality of modes with different conditions for switching between the cooling state and the heating state, and the plurality of modes may be set in response to a user request input from the user interface 9, for example. This allows the temperature control of the battery 3 to reflect the user request.

[0049] Fig. 6 is a flowchart (part 1) showing the procedure for executing the cooling mode described in Fig. 5. First, the battery ECU 6 acquires the minimum battery temperature Tmin and the maximum battery temperature Tmax (step S1). Next, the cooling mode set in response to the user's operation of the user interface 9 is acquired (step S2).

[0050] Next, the temperature adjustment control unit 7 compares the following four values.

[0051] - Minimum battery temperature Tmin Maximum battery internal temperature Tmax Allow operation of cooling device 4 Allow operation of cooling device Battery upper limit temperature To_up Allows operation of cooling device 4 Allows operation of cooling device Lower limit battery temperature To_down

[0052] The temperature control unit 7 determines whether the maximum battery internal temperature Tmax is equal to or greater than the cooling device operation permission upper limit battery temperature To_up and whether the minimum battery internal temperature Tmin is equal to or greater than the cooling device operation permission lower limit battery temperature To_down (step S3). That is, the temperature control unit 7 determines whether the following formula (1) is satisfied:

[0053] Tmax ≧ To_up and Tmin ≧ To_down (1)

[0054] If the condition of formula (1) is satisfied (step S3; Yes), the temperature control unit 7 determines whether the set cooling mode is the cooling priority mode shown in Fig. 5(a) (step S4). If the set cooling mode is the cooling priority mode (step S4; Yes), the temperature control unit 7 determines whether the maximum battery internal temperature Tmax is equal to or higher than the cooling target temperature Ttar1, which is the temperature to be targeted in the cooling mode (step S5).

[0055] If the maximum temperature Tmax inside the battery is equal to or higher than the cooling target temperature Ttar1 (Tmax≧Ttar1) (step S5; Yes), the temperature control unit 7 sets the cooling state to turn on the cooling device 4 (operating state) and turn off the heating device 5 (non-operating state) (step S6).

[0056] After turning on the cooling device 4, the temperature adjustment control unit 7 counts the operating time of the cooling device 4 and determines whether the operating time is less than the cooling device operating time t1 (step S7). If the operating time is less than the cooling device operating time t1 (step S7; Yes), the temperature adjustment control unit 7 determines whether the maximum battery internal temperature Tmax is equal to or less than the cooling target temperature Ttar1 (Tmax≦Ttar1) (step S8).

[0057] If the maximum battery internal temperature Tmax is equal to or lower than the cooling target temperature Ttar1 (Tmax≦Ttar1) (step S8; Yes), the temperature adjustment control unit 7 sets the heating state to turn the cooling device 4 off (non-operating state) and turn the heating device 5 on (operating state) (step S9). If the maximum battery internal temperature Tmax is not equal to or lower than the cooling target temperature Ttar1 in step S8 (step S8; No), the process returns to step S7 again, and the temperature adjustment control unit 7 counts the time that the cooling device 4 has been operating.

[0058] When the temperature difference ΔT obtained by subtracting the upper battery temperature Tu from the lower battery temperature Td becomes zero (step S10), the temperature control unit 7 sets the cooling device 4 to an off state (non-operating state) and the heating device 5 to an off state (non-operating state) (step S11), and ends the processing.

[0059] In step S7, if the time that the cooling device 4 has been operating is equal to or longer than the cooling device operating time t1 (step S7; No), the temperature control unit 7 sets the heating state to turn the cooling device 4 off (non-operating state) and turn the heating device 5 on (operating state) (step S12).

[0060] When the temperature difference ΔT obtained by subtracting the upper battery temperature Tu from the lower battery temperature Td becomes zero (step S13), the process returns to step S5 again, and the processes from step S5 onwards are repeated.

[0061] If the condition of formula (1) is not satisfied in step S3 (step S3; No), or if the maximum temperature Tmax inside the battery is lower than the cooling target temperature Ttar1 in step S5 (step S5; No), the process proceeds to step S11, where the temperature control unit 7 sets the stopped state and ends the process.

[0062] Next, the normal cooling mode shown in Fig. 5(b) will be described. In step S4, if the temperature control unit 7 determines that the set cooling mode is not the cooling priority mode (step S4; No), it determines whether the set cooling mode is the normal cooling mode (step S14). If the set cooling mode is the normal cooling mode (step S14; Yes), the temperature control unit 7 determines whether the maximum battery internal temperature Tmax is equal to or higher than the cooling target temperature Ttar1, which is the temperature to be targeted in the cooling mode (step S15).

[0063] If the maximum temperature Tmax inside the battery is equal to or higher than the cooling target temperature Ttar1 (Tmax≧Ttar1) (step S15; Yes), the temperature control unit 7 sets the cooling state to turn on (operating state) the cooling device 4 and turn off (non-operating state) the heating device 5 (step S16).

[0064] Furthermore, the temperature adjustment control unit 7 determines whether the maximum battery internal temperature Tmax is greater than the cooling target temperature Ttar1 (Tmax>Ttar1) (step S17). If the maximum battery internal temperature Tmax is greater than the cooling target temperature Ttar1 (step S17; Yes), the temperature adjustment control unit 7 determines whether the operation time of the cooling device 4 has exceeded the cooling device operation time t1 (step S18). If the operation time of the cooling device 4 has not exceeded the cooling device operation time t1 (step S18; No), the process returns to step S17, and the temperature adjustment control unit 7 determines whether the maximum battery internal temperature Tmax is greater than the cooling target temperature Ttar1.

[0065] In step S18, when the time during which the cooling device 4 has been operating has exceeded the cooling device operating time t1 (step S18; Yes), the temperature control unit 7 sets the heating state to turn the cooling device 4 off (non-operating state) and turn the heating device 5 on (operating state) (step S19).

[0066] After the heating device 5 is turned on, when the operating time of the heating device 5 has elapsed for the heating device operating time t2 (step S20), the process returns to step S15 again, and the processes from step S15 onwards are repeated. However, if the maximum battery internal temperature Tmax is lower than the cooling target temperature Ttar1 in step S15 (step S15; No), the temperature adjustment control unit 7 proceeds to step S11, where the temperature adjustment control unit 7 is set to a stopped state and ends the process. Also, if the maximum battery internal temperature Tmax is equal to or lower than the cooling target temperature Ttar1 in step S17 (step S17; No), the temperature adjustment control unit 7 proceeds to step S9, and performs the processes from step S9 onwards.

[0067] Next, the output priority mode shown in Fig. 5(c) will be described with reference to Fig. 7, which is a continuation of Fig. 6. In step S14, if the temperature adjustment control unit 7 determines that the set cooling mode is not the normal cooling mode (step S14; No), it determines that the set cooling mode is the output priority mode (step S21).

[0068] The temperature control unit 7 determines whether the maximum temperature Tmax inside the battery is equal to or greater than the cooling target temperature Ttar1 (Tmax≧Ttar1) (step S22; Yes), and if the maximum temperature Tmax inside the battery is equal to or greater than the cooling target temperature Ttar1 (Tmax≧Ttar1) (step S22; Yes), the temperature control unit 7 sets the cooling state to turn on the cooling device 4 (operating state) and turn off the heating device 5 (non-operating state) (step S23).

[0069] Next, the temperature adjustment control unit 7 determines whether the maximum battery internal temperature Tmax is equal to or lower than the cooling target temperature Ttar1 (step S24). If the maximum battery internal temperature Tmax is equal to or lower than the cooling target temperature Ttar1 (Tmax≦Ttar1) (step S24; Yes), the temperature adjustment control unit 7 sets the heating state to turn the cooling device 4 off (non-operating state) and turn the heating device 5 on (operating state) (step S25).

[0070] When the temperature difference ΔT obtained by subtracting the upper battery temperature Tu from the lower battery temperature Td becomes zero (step S26), the temperature adjustment control unit 7 sets the cooling device 4 and the heating device 5 to a stopped state (inactive state) (step S27), and ends the process. Note that if the maximum battery internal temperature Tmax in step S22 is lower than the cooling target temperature Ttar1 (step S22; No), the process proceeds to step S27, where the temperature adjustment control unit 7 sets the device to a stopped state and ends the process.

[0071] Furthermore, if, in step S24, the maximum battery internal temperature Tmax is not equal to or less than the cooling target temperature Ttar1 (step S24; No), the temperature adjustment control unit 7 determines whether the temperature difference ΔT obtained by subtracting the upper battery temperature Tu from the lower battery temperature Td is equal to or less than a predetermined allowable temperature difference T1 during cooling (step S28). If the temperature difference ΔT is equal to or less than the allowable temperature difference T1 during cooling (step S28; Yes), the temperature adjustment control unit 7 sets a heating state in which the cooling device 4 is turned off (inactive state) and the heating device 5 is turned on (active state) (step S29). When the temperature difference ΔT obtained by subtracting the upper battery temperature Tu from the lower battery temperature Td becomes zero (step S30), the process returns to step S22, and the temperature adjustment control unit 7 repeats the processes from step S22 onwards.

[0072] If the temperature difference ΔT is not equal to or less than the allowable temperature difference during cooling T1 in step S28 (step S28; No), the process returns to step S24, and the temperature adjustment control unit 7 determines whether the maximum battery internal temperature Tmax is equal to or less than the cooling target temperature Ttar1.

[0073] As described above, in the cooling mode, the temperature control unit 7 sets the battery to the cooling state (steps S6, S16, S23) when the maximum battery internal temperature Tmax is higher than the cooling target temperature Ttar1 (steps S5, S15, S22). Next, the temperature control unit 7 switches from the cooling state to the heating state (steps S9, S25) when the maximum battery internal temperature Tmax becomes equal to or lower than the cooling target temperature Ttar1 in the cooling state (steps S8, S17, S24). Furthermore, the temperature control unit 7 switches from the heating state to the stopped state (steps S11, S27) when the temperature difference ΔT obtained by subtracting the upper battery temperature Tu from the lower battery temperature Td in the heating state is equal to or lower than a first predetermined value (ΔT=0 in this example) (steps S10, S26).

[0074] In this way, by switching from the cooling state to the heating state when the maximum temperature Tmax inside the battery becomes lower than the cooling target temperature Ttar1 during cooling of the battery 3, it is possible to prevent overcooling in the low temperature region and prevent the output of the battery 3 from being restricted.

[0075] In addition, in the cooling priority mode shown in (a) of Figure 5, if the operating state of the cooling device 4 has exceeded the cooling device operating time t1 before the maximum temperature Tmax inside the battery becomes equal to or lower than the cooling target temperature Ttar1 (step S7), the temperature control unit 7 switches from the cooling state to the heating state (step S12), and if the temperature difference ΔT obtained by subtracting the upper battery temperature Tu from the lower battery temperature Td in the heating state is equal to or lower than a first predetermined value (ΔT = 0 in this example) (step S13), the temperature control unit 7 switches from the heating state to the cooling state (step S6).

[0076] This allows the maximum battery internal temperature Tmax to reach the cooling target temperature Ttar1 in a short time.

[0077] In addition, in the normal cooling mode shown in (b) of Figure 5, when the operating state of the cooling device 4 has exceeded the cooling device operating time t1 in the cooling state before the maximum temperature Tmax inside the battery becomes equal to or lower than the cooling target temperature Ttar1 (step S18), the temperature control unit 7 switches from the cooling state to the heating state (step S19), and when the operating state of the heating device 5 has exceeded the heating device operating time t2 in the heating state (step S20), the temperature control unit 7 switches from the heating state to the cooling state (step S16).

[0078] This allows the maximum battery internal temperature Tmax to reach the cooling target temperature Ttar1 in a longer time than in the cooling priority mode, and makes it possible to prevent the output of the battery 3 from being restricted.

[0079] In the output priority mode shown in (c) of Figure 5, when the temperature difference ΔT obtained by subtracting the upper battery temperature Tu from the lower battery temperature Td in the cooling state is equal to or less than the allowable temperature difference T1 during cooling (step S28), the temperature control unit 7 switches from the cooling state to the heating state (step S29), and when the temperature difference obtained by subtracting the upper battery temperature Tu from the lower battery temperature Td in the heating state is equal to or less than a first predetermined value (ΔT = 0 in this example) that is smaller than the allowable temperature difference T1 during cooling (step S30), the temperature control unit 7 switches from the heating state to the cooling state (step S23).

[0080] This makes it possible to make the maximum battery internal temperature Tmax reach the cooling target temperature Ttar1 while reducing the region in which the output of the battery 3 is limited.

[0081] Fig. 8 is a graph showing the internal battery temperature in the battery heating mode of a conventional battery temperature control system. Fig. 8 shows the time changes of the water temperature (refrigerant temperature), minimum internal battery temperature, and maximum internal battery temperature with respect to the target temperature of the battery 3, which is a constant control target. The minimum internal battery temperature Tmin, which is the temperature near the upper battery region 32, approaches the target temperature over time. On the other hand, the maximum internal battery temperature Tmax, which is the temperature near the lower battery region 31, exceeds the target temperature over time.

[0082] When the battery ECU 6 acquires the minimum internal battery temperature Tmin and the maximum internal battery temperature Tmax of the battery 3, it normally references the minimum internal battery temperature Tmin to determine the permitted power of the battery 3. If the temperature difference inside the battery 3 is not actively eliminated and continued use thereafter continues, the maximum internal battery temperature Tmax will remain at a high temperature, which may cause localized performance degradation of the battery 3.

[0083] On the other hand, FIG. 9 is a diagram showing (a) a graph of the temperature inside the battery and (b) a graph of the water temperature (temperature of the refrigerant) in a heating mode in which the battery 3 of the battery temperature adjustment system 1 of this embodiment is heated.

[0084] The battery ECU 6 acquires the lower battery temperature Td of the lower battery area 31 and the upper battery temperature Tu of the upper battery area 32, and calculates the maximum battery internal temperature Tmax and the minimum battery internal temperature Tmin. There are no particular limitations on the method of calculating the maximum battery internal temperature Tmax and the minimum battery internal temperature Tmin, and they can be calculated in the same way as when cooling. The temperature adjustment control unit 7 references the minimum battery internal temperature Tmin and the maximum battery internal temperature Tmax of the battery 3, and switches between the cooling state, the heating state, and the stopped state, as described above.

[0085] When heating the battery 3, the temperature adjustment control unit 7 selects a heating state in which the heating device 5 is activated and the cooling device 4 is deactivated. In the heating state, the upper battery temperature Tu (minimum battery internal temperature Tmin) and the lower battery temperature Td (maximum battery internal temperature Tmax) rise. As shown in FIG. 9(a), after the upper battery temperature Tu (maximum battery internal temperature Tmax) exceeds the target temperature (P1), the temperature adjustment control unit 7 selects a cooling state in which the cooling device 4 is activated and the heating device 5 is deactivated. As a result, the water temperature starts to decrease as shown in FIG. 9(b), and the maximum battery internal temperature Tmax starts to decrease as the lower battery temperature Td in the lower battery region 31 near the water jacket 11 decreases (P2).

[0086] After a predetermined time has elapsed in the cooling state, the temperature Td at the bottom of the battery (maximum temperature Tmax inside the battery) falls significantly below the target temperature (P3). The temperature control unit 7 then transitions to a heating state, deactivating the cooling device 4 and activating the heating device 5. This causes the water temperature to begin rising (P4), as shown in FIG. 9(b), and the temperature Td at the bottom of the battery (maximum temperature Tmax inside the battery) begins to rise. The temperature control unit 7 and the battery ECU 6 then repeat the same operations.

[0087] In this way, the temperature adjustment control unit 7 can prevent localized performance degradation of the battery 3 by bringing the temperature of the battery 3 closer to the target temperature while eliminating the temperature difference inside the battery 3.

[0088] Figure 10 shows graphs of the temperature inside the battery and the water temperature in two more specific modes in the heating mode in which the battery temperature control system 1 heats the battery 3: (a) heating priority mode and (b) active protection mode.

[0089] In the heating priority mode of FIG. 10(a), the switching from the heating state to the cooling state is performed, for example, at the following timing.

[0090] The timing when the operating time of the heating device 5 has elapsed for a predetermined period of time. The time when the temperature difference ΔT (ΔT = Td - Tu, hereinafter the same) obtained by subtracting the upper battery temperature Tu from the lower battery temperature Td becomes greater than the specified allowable temperature difference T3 during heating (ΔT > T3).

[0091] The cooling state is switched to the heating state at the following timings, for example.

[0092] The timing when the operation time of the cooling device 4 has elapsed for a predetermined period of time. The timing when the temperature difference ΔT becomes equal to or less than the specified allowable temperature difference T4 during cooling (ΔT≦T4)

[0093] According to this mode, the minimum battery internal temperature Tmin reaches the target temperature in a reasonable amount of time.

[0094] In the active protection mode of FIG. 10(b), the state is switched from the heating state to the cooling state at the following timing, for example.

[0095] The timing when the maximum internal battery temperature Tmax reaches the upper limit temperature Tht (Tmax = Tht), which is the upper limit temperature allowed during heating.

[0096] The cooling state is switched to the heating state at the following timings, for example.

[0097] The time when the temperature difference ΔT becomes zero (ΔT=0) The timing when the temperature difference ΔT becomes equal to or less than the specified allowable temperature difference T4 during cooling (ΔT≦T4)

[0098] In this mode, the maximum battery internal temperature Tmax does not exceed the heating allowable upper limit temperature Tht, so the durability of the battery 3 can be maintained for a long period of time. On the other hand, the heating time until the minimum battery internal temperature Tmin reaches the target temperature becomes longer.

[0099] Fig. 11 is a flowchart showing the procedure for executing the heating mode described in Fig. 10. First, the battery ECU 6 acquires the minimum battery internal temperature Tmin and the maximum battery internal temperature Tmax (step S41). Next, the heating mode set in response to the user's operation of the user interface 9 is acquired (step S42).

[0100] Next, the temperature adjustment control unit 7 compares the following four values.

[0101] - Minimum battery temperature Tmin Maximum battery internal temperature Tmax Allow heating device 5 to operate Allow heating device to operate Battery upper limit temperature Too_up Allow heating device 5 to operate Allow heating device to operate Lower battery temperature limit Too_down

[0102] The temperature control unit 7 determines whether the maximum battery internal temperature Tmax is equal to or lower than the heating device operation permission upper limit battery temperature Too_up and whether the minimum battery internal temperature Tmin is equal to or lower than the heating device operation permission lower limit battery temperature Too_down (step S43). That is, the temperature control unit 7 determines whether the following formula (2) is satisfied:

[0103] Tmax≦Too_up and Tmin≦Too_down (2)

[0104] If the condition of equation (2) is met (step S43; Yes), the temperature adjustment control unit 7 determines whether the set heating mode is the heating priority mode shown in Fig. 10(a) (step S44). If the set heating mode is the heating priority mode (step S44; Yes), the temperature adjustment control unit 7 determines whether the minimum battery internal temperature Tmin is lower than the heating target temperature Ttar2, which is the temperature to be targeted in the heating mode (step S45).

[0105] When the minimum temperature Tmin inside the battery is lower than the heating target temperature Ttar2 (Tmin < Ttar2) (step S45; Yes), the temperature control unit 7 sets a heating state in which the heating device 5 is turned on (operating state) and the cooling device 4 is turned off (non-operating state) (step S46).

[0106] After turning on the heating device 5, the temperature control unit 7 counts the time the heating device 5 has been operating, and determines whether the operating time is less than the heating device operating time t3 (step S47). When the operating time is less than the heating device operating time t3 (step S47; Yes), the temperature control unit 7 determines whether the minimum temperature Tmin inside the battery is equal to or higher than the heating target temperature Ttar2 (Tmin ≥ Ttar2) (step S48).

[0107] When the minimum temperature Tmin inside the battery is equal to or higher than the heating target temperature Ttar2 (step S48; Yes), the temperature control unit 7 sets a cooling state in which the heating device 5 is turned off (non-operating state) and the cooling device 4 is turned on (operating state) (step S49). In step S48, when the minimum temperature Tmin inside the battery is not equal to or higher than the heating target temperature Ttar2 (step S48; No), the process returns to step S47 again, and the temperature control unit 7 counts the time the heating device 5 has been operating.

[0108] When the temperature difference ΔT obtained by subtracting the lower battery temperature Td from the upper battery temperature Tu becomes zero (step S50), the temperature control unit 7 sets a stop state in which the heating device 5 is turned off (non-operating state) and the cooling device 4 is turned off (non-operating state) (step S51), and ends the process.

[0109] In step S47, when the operating time of the heating device 5 is not less than the heating device operating time t3 (step S47; No), the temperature control unit 7 sets a cooling state in which the heating device 5 is turned off (non-operating state) and the cooling device 4 is turned on (operating state) (step S52).

[0110] After turning on the cooling device 4, when the operating time has elapsed for the cooling device operating time t4 (step S53), the process returns to step S45 again, and the processes after step S45 are repeated.

[0111] If the condition of equation (2) is not satisfied in step S43 (step S43; No), or if the minimum temperature Tmin in the battery is not less than the heating target temperature Ttar2 in step S45 (step S45; No), the process proceeds to step S51, and the temperature control unit 7 sets the stop state and ends the process.

[0112] Next, the active protection mode shown in (b) of FIG. 10 will be described. In step S44, when the temperature control unit 7 determines that the set heating mode is not the heating priority mode (step S44; No), it determines that the set heating mode is the active protection mode (step S54). <id =

[0113] If the minimum temperature Tmin in the battery is less than the heating target temperature Ttar2 (Tmin < Ttar2) (step S55; Yes), the temperature control unit 7 sets a heating state in which the heating device 5 is turned on (operating state) and the cooling device 4 is turned off (non - operating state) (step S56).

[0114] When the maximum temperature Tmax in the battery reaches the heating allowable upper limit temperature Tht (Tmax = Tht) (step S57), the temperature control unit 7 determines whether the minimum temperature Tmin in the battery is less than the heating target temperature Ttar2 (step S58). If the minimum temperature Tmin in the battery is less than the heating target temperature Ttar2 (Tmin < Ttar2) (step S58; Yes), the temperature control unit 7 sets a cooling state in which the heating device 5 is turned off (non - operating state) and the cooling device 4 is turned on (operating state) (step S59).

[0115] [[ID=*19]] When the temperature difference ΔT obtained by subtracting the upper battery temperature Tu from the lower battery temperature Td becomes zero (step S60), the process returns to step S55 again, and the processes from step S55 onwards are repeated. However, if the lowest battery temperature Tmin is not lower than the heating target temperature Ttar2 in step S55 (step S55; No), the temperature adjustment control unit 7 proceeds to step S51, where the temperature adjustment control unit 7 sets a stopped state and ends the process. Also, if the lowest battery temperature Tmin is not lower than the heating target temperature Ttar2 in step S58 (step S58; No), the temperature adjustment control unit 7 proceeds to step S49, and performs the processes from step S49 onwards.

[0116] As described above, in the heating mode, the temperature control unit 7 switches to the heating state (steps S46 and S56) when the minimum battery internal temperature Tmin is lower than the heating target temperature Ttar2 (steps S45 and S55). Next, when the minimum battery internal temperature Tmin becomes equal to or higher than the heating target temperature Ttar2 in the heating state (steps S48 and S58), the temperature control unit 7 switches from the heating state to the cooling state (steps S49 and S59). Furthermore, when the temperature difference ΔT obtained by subtracting the upper battery temperature Tu from the lower battery temperature Td in the cooling state is equal to or less than a first predetermined value (ΔT=0 in this example) (step S50), the temperature control unit 7 switches from the cooling state to the stopped state (step S51).

[0117] In this way, by switching from the heating state to the cooling state when the minimum battery internal temperature Tmin becomes equal to or higher than the heating target temperature Ttar2 during heating of the battery 3, overheating of the high temperature region can be suppressed.

[0118] In addition, in the heating priority mode shown in (a) of Figure 10, when the operating state of the heating device 5 has exceeded the heating device operating time t3 in the heating state before the minimum temperature Tmin inside the battery becomes equal to or higher than the heating target temperature Ttar2 (step S47), the temperature control unit 7 switches from the heating state to the cooling state (step S52), and when the operating state of the cooling device 4 has exceeded the cooling device operating time t4 in the cooling state (step S53), the temperature control unit 7 switches from the cooling state to the heating state (step S46).

[0119] This allows the minimum battery internal temperature Tmin to reach the heating target temperature Ttar2 over an appropriate period of time while preventing overheating in the high temperature region.

[0120] In addition, in the active protection mode shown in (b) of Figure 10, when the maximum battery temperature Tmax reaches the heating allowable upper limit temperature Tht before the minimum battery temperature Tmin reaches or exceeds the heating target temperature Ttar2 in the heating state (step S57), the temperature control unit 7 switches from the heating state to the cooling state (step S59), and when the temperature difference ΔT obtained by subtracting the upper battery temperature Tu from the lower battery temperature Td in the cooling state is equal to or less than a first predetermined value (ΔT = 0 in this example) (step S60), the temperature control unit 7 switches from the cooling state to the heating state (step S56).

[0121] This makes it possible to make the minimum battery temperature Tmin reach the heating target temperature Ttar2 while preventing the maximum battery temperature Tmax from exceeding the heating allowable upper limit temperature Tht, thereby suppressing deterioration of the battery 3.

[0122] Although various embodiments have been described above with reference to the drawings, it goes without saying that the present invention is not limited to such examples. It is clear that a person skilled in the art can conceive of various modifications or alterations within the scope of the claims, and it is understood that these also naturally fall within the technical scope of the present invention. Furthermore, the components of the above-described embodiments may be combined in any manner without departing from the spirit of the invention.

[0123] For example, the battery 3 is not limited to a laminated cell, but may be a can-type cell or a cylindrical cell.

[0124] This specification describes at least the following items. Note that the components in parentheses correspond to those in the above-described embodiment, but are not limited to these.

[0125] (1) Battery (Battery 3) and a cooling unit (cooling device 4) that cools the battery; a heating unit (heating device 5) that heats the battery; a temperature acquisition unit (battery ECU 6) that acquires the temperature of the battery; A battery temperature control system (battery temperature control system 1) including a temperature control control unit (temperature control control unit 7) that controls the cooling unit and the heating unit, The temperature adjustment control unit a cooling state in which the cooling unit is in an operating state and the heating unit is in an inoperable state; a heating state in which the cooling unit is in an inactive state and the heating unit is in an active state; a stop state in which the cooling unit is in an inactive state and the heating unit is in an inactive state; When the temperature of the battery is brought close to the target temperatures (cooling target temperature Ttar1, heating target temperature Ttar2), the cooling state and the heating state are switched at least once. Battery temperature control system.

[0126] According to (1), the battery temperature can be brought closer to the target temperature while eliminating the temperature difference inside the battery, thereby preventing the battery output from being limited due to a local drop in the battery temperature, and preventing the battery from being deteriorated due to a local rise in the battery temperature.

[0127] (2) The battery temperature control system according to (1), The temperature adjustment control unit The cooling state and the heating state are successively switched multiple times. Battery temperature control system.

[0128] According to (2), the temperature difference inside the battery can be more reliably prevented from increasing.

[0129] (3) The battery temperature control system according to (1), an output control unit (battery ECU 6) that controls the output of the battery; the temperature acquisition unit acquires temperatures at a plurality of locations of the battery; The output control unit controls the output of the battery based on a lower temperature (minimum temperature Tmin inside the battery) among the temperatures at the plurality of locations. Battery temperature control system.

[0130] According to (3), in an environment where the battery output is controlled based on the low-temperature side temperature of the battery, by bringing the battery temperature closer to the target temperature while eliminating the temperature difference inside the battery, it is possible to prevent the battery temperature from becoming locally low and limiting the battery output.

[0131] (4) The battery temperature control system according to (1), the temperature acquisition unit acquires temperatures at a plurality of locations of the battery; The cooling state and the heating state are switched based on the temperature difference (temperature difference ΔT) between the high-side temperature and the low-side temperature. Battery temperature control system.

[0132] According to (4), the temperature difference between the high-side temperature and the low-side temperature of the battery can be prevented from exceeding a predetermined value.

[0133] (5) The battery temperature control system according to (1), The switching between the cooling state and the heating state is switched based on the operation time of the cooling unit or the heating unit. Battery temperature control system.

[0134] According to (5), the temperature difference between the high-side temperature and the low-side temperature of the battery can be prevented from exceeding a predetermined value, and control can be facilitated.

[0135] (6) The battery temperature control system according to (1), The temperature adjustment control unit The temperature of the battery can be controlled in a plurality of modes with different conditions for switching between the cooling state and the heating state, The plurality of modes are set according to a user's request. Battery temperature control system.

[0136] According to (6), the user's request can be reflected in the temperature control of the battery.

[0137] (7) The battery temperature control system according to (1), the temperature acquisition unit acquires temperatures at a plurality of locations of the battery; The temperature adjustment control unit When the high temperature side temperature (maximum temperature Tmax inside the battery) is higher than the target temperature (cooling target temperature Ttar1), the cooling state is established. When the high-temperature-side temperature becomes equal to or lower than the target temperature in the cooling state, the cooling state is switched to the heating state; When the temperature difference (temperature difference ΔT) between the high-side temperature and the low-side temperature in the heating state is equal to or less than a first predetermined value (ΔT=0), the heating state is switched to the stopped state. Battery temperature control system.

[0138] According to (7), by switching from the cooling state to the heating state when the high-temperature side temperature falls below the target temperature during cooling of the battery, it is possible to prevent overcooling in the low-temperature side region and prevent the battery output from being restricted.

[0139] (8) The battery temperature control system according to (7), when the operating state of the cooling unit has elapsed for a first time (cooling device operating time t1) before the high-temperature-side temperature becomes equal to or lower than the target temperature in the cooling state, the cooling state is switched to the heating state; When the temperature difference between the high-side temperature and the low-side temperature in the heating state is equal to or less than a first predetermined value (ΔT=0), the heating state is switched to the cooling state. Battery temperature control system.

[0140] According to (8), the battery temperature can reach the target temperature in a short time.

[0141] (9) The battery temperature control system according to (7), when the operating state of the cooling unit has elapsed for a first time (cooling device operating time t1) before the high-temperature-side temperature becomes equal to or lower than the target temperature in the cooling state, the cooling state is switched to the heating state; When the operating state of the heating unit in the heating state has elapsed for a second time (heating device operating time t2), the heating state is switched to the cooling state. Battery temperature control system.

[0142] According to (9), the battery temperature can be allowed to reach the target temperature in an appropriate amount of time, and the battery output can be prevented from being limited.

[0143] (10) The battery temperature control system according to (7), When the temperature difference between the low-temperature side temperature and the high-temperature side temperature in the cooling state is equal to or less than a second predetermined value (ΔT=T1), the cooling state is switched to the heating state; When the temperature difference between the high-side temperature and the low-side temperature in the heating state is equal to or less than a first predetermined value (ΔT=0) that is smaller than the second predetermined value, the heating state is switched to the cooling state. Battery temperature control system.

[0144] According to (10), the temperature of the battery can reach the target temperature while reducing the region where the battery output is limited.

[0145] (11) The battery temperature control system according to (7), the temperature acquisition unit acquires temperatures at a plurality of locations of the battery; The temperature adjustment control unit When the low-temperature side temperature (the minimum temperature inside the battery Tmin) is lower than the target temperature (the heating target temperature Ttar2), the heating state is established. When the low-temperature side temperature becomes equal to or higher than the target temperature in the heating state, the heating state is switched to the cooling state; When the temperature difference between the high-side temperature and the low-side temperature in the cooling state is equal to or less than a first predetermined value (ΔT=0), the cooling state is switched to the stopped state. Battery temperature control system.

[0146] According to (11), when the low-temperature side temperature becomes equal to or higher than the target temperature during heating of the battery, the state is switched from the heating state to the cooling state, thereby preventing overheating of the high-temperature side region.

[0147] (12) The battery temperature control system according to (11), When the operating state of the heating unit has elapsed for a third time (heating device operating time t3) before the low-temperature side temperature becomes equal to or higher than the target temperature in the heating state, the heating state is switched to the cooling state; When the operating state of the cooling unit in the cooling state has elapsed for a fourth time (cooling device operating time t4), the cooling state is switched to the heating state. Battery temperature control system.

[0148] According to (12), the battery temperature can be made to reach the target temperature over an appropriate period of time while preventing overheating in the high temperature region.

[0149] (13) The battery temperature control system according to (11), switching from the heating state to the cooling state when the high-temperature-side temperature reaches a heating allowable upper limit temperature (heating allowable upper limit temperature Tht) before the low-temperature-side temperature reaches or exceeds the target temperature in the heating state; When the temperature difference between the high-side temperature and the low-side temperature in the cooling state is equal to or less than a first predetermined value (ΔT=0), the cooling state is switched to the heating state. Battery temperature control system.

[0150] According to (13), the battery temperature can be made to reach the target temperature while preventing the battery temperature from exceeding the allowable upper temperature limit for heating, thereby suppressing battery deterioration.

[0151] (14) A battery temperature control system according to any one of (1) to (13), A water jacket (water jacket 11) that directly or indirectly contacts one surface of the cooling unit, the heating unit, and the battery is connected to a temperature control circuit (temperature control circuit 12) through which a heat transfer medium circulates; the temperature acquisition unit acquires a temperature on the one surface side of the battery and a temperature on the opposite surface to the one surface. Battery temperature control system.

[0152] According to (14), one side of the battery with which the water jacket comes into direct or indirect contact is greatly affected by the temperature control circuit, so by obtaining the temperature on one side of the battery and the temperature on the opposite side, the battery temperature can be appropriately managed. [Explanation of symbols]

[0153] 1 Battery temperature control system 2. Control section 3 Battery 4 Cooling device (cooling section) 5. Heating device (heating unit) 6 Battery ECU (temperature acquisition unit, output control unit) 7 Temperature control unit 8 EWP 9 User Interface 11 Water Jacket 12 Temperature control circuit 31 Lower battery area 32 Upper battery area

Claims

1. A battery, a cooling unit that cools the battery; a heating unit that heats the battery; a temperature acquisition unit that acquires the temperature of the battery; A battery temperature control system including a temperature control control unit that controls the cooling unit and the heating unit, The temperature adjustment control unit a cooling state in which the cooling unit is in an operating state and the heating unit is in an inoperable state; a heating state in which the cooling unit is in an inactive state and the heating unit is in an active state; a stop state in which the cooling unit is in an inactive state and the heating unit is in an inactive state; switching between the cooling state and the heating state at least once when the temperature of the battery approaches the target temperature; Battery temperature control system.

2. The battery temperature control system according to claim 1, The temperature adjustment control unit The cooling state and the heating state are successively switched multiple times. Battery temperature control system.

3. The battery temperature control system according to claim 1, an output control unit that controls the output of the battery; the temperature acquisition unit acquires temperatures at a plurality of locations of the battery; the output control unit controls the output of the battery based on a lower temperature among the temperatures at the plurality of locations. Battery temperature control system.

4. The battery temperature control system according to claim 1, the temperature acquisition unit acquires temperatures at a plurality of locations of the battery; The cooling state and the heating state are switched based on a temperature difference between a high-side temperature and a low-side temperature. Battery temperature control system.

5. The battery temperature control system according to claim 1, The switching between the cooling state and the heating state is switched based on the operation time of the cooling unit or the heating unit. Battery temperature control system.

6. The battery temperature control system according to claim 1, The temperature adjustment control unit The temperature of the battery can be controlled in a plurality of modes with different conditions for switching between the cooling state and the heating state, The plurality of modes are set according to a user's request. Battery temperature control system.

7. The battery temperature control system according to claim 1, the temperature acquisition unit acquires temperatures at a plurality of locations of the battery; The temperature adjustment control unit When the high-temperature side temperature is higher than the target temperature, the cooling state is established; When the high-temperature-side temperature becomes equal to or lower than the target temperature in the cooling state, the cooling state is switched to the heating state; When a temperature difference between the high-side temperature and the low-side temperature in the heating state is equal to or less than a first predetermined value, the heating state is switched to the stopped state. Battery temperature control system.

8. The battery temperature control system according to claim 7, When the operating state of the cooling unit has elapsed for a first time before the high-temperature-side temperature becomes equal to or lower than the target temperature in the cooling state, the cooling state is switched to the heating state; When a temperature difference between the high-side temperature and the low-side temperature in the heating state is equal to or less than a first predetermined value, the heating state is switched to the cooling state. Battery temperature control system.

9. The battery temperature control system according to claim 7, When the operating state of the cooling unit has elapsed for a first time before the high-temperature-side temperature becomes equal to or lower than the target temperature in the cooling state, the cooling state is switched to the heating state; When the operating state of the heating unit in the heating state has elapsed for a second time, the heating state is switched to the cooling state. Battery temperature control system.

10. The battery temperature control system according to claim 7, When a temperature difference between the low-temperature side temperature and the high-temperature side temperature in the cooling state is equal to or less than a second predetermined value, the cooling state is switched to the heating state; When a temperature difference between the high-side temperature and the low-side temperature in the heating state is equal to or less than a first predetermined value that is smaller than the second predetermined value, the heating state is switched to the cooling state. Battery temperature control system.

11. The battery temperature control system according to claim 7, the temperature acquisition unit acquires temperatures at a plurality of locations of the battery; The temperature adjustment control unit When the low-temperature side temperature is lower than the target temperature, the heating state is established; When the low-temperature side temperature becomes equal to or higher than the target temperature in the heating state, the heating state is switched to the cooling state; When a temperature difference between the high-side temperature and the low-side temperature in the cooling state is equal to or less than a first predetermined value, the cooling state is switched to the stopped state. Battery temperature control system.

12. The battery temperature control system according to claim 11, When the operating state of the heating unit has elapsed for a third time before the low-temperature side temperature becomes equal to or higher than the target temperature in the heating state, the heating state is switched to the cooling state; When the operating state of the cooling unit in the cooling state has exceeded a fourth time, the cooling state is switched to the heating state. Battery temperature control system.

13. The battery temperature control system according to claim 11, switching from the heating state to the cooling state when the high-temperature side temperature reaches a heating allowable upper limit temperature before the low-temperature side temperature reaches or exceeds the target temperature in the heating state; When a temperature difference between the high-side temperature and the low-side temperature in the cooling state is equal to or less than a first predetermined value, the cooling state is switched to the heating state. Battery temperature control system.

14. The battery temperature control system according to any one of claims 1 to 13, a temperature control circuit in which a water jacket is connected to the cooling unit, the heating unit, and one surface of the battery in direct or indirect contact with the battery, and in which a heat transfer medium circulates; the temperature acquisition unit acquires a temperature on the one surface side of the battery and a temperature on the opposite surface to the one surface. Battery temperature control system.

Images