Temperature control device and temperature control method for power storage device

Abstract

A temperature control device and a temperature control method for an energy storage device are provided. The temperature control device for the energy storage device includes: a first determination unit for determining whether the energy storage device is in fast charging; a temperature acquisition unit for acquiring the temperature of the energy storage device; a second determination unit for determining whether the temperature acquired by the temperature acquisition unit exceeds an upper limit temperature; and a temperature control unit for cooling the energy storage device using a temperature regulating mechanism when both the determination results of the first determination unit and the second determination unit are yes.

Description

Technical Field

[0001] This invention relates to a temperature control device and a temperature control method for energy storage devices. Background Technology

[0002] Energy storage devices are widely used in electric vehicles such as electric cars and hybrid vehicles. Based on the viewpoint of maximizing the performance of energy storage devices or suppressing their degradation, various technologies for controlling energy storage devices have been proposed (see, for example, Patent Documents 1-4).

[0003] Existing technical documents

[0004] Patent documents

[0005] Patent Document 1: Japanese Patent Application Publication No. 2023-152429

[0006] Patent Document 2: Japanese Patent Application Publication No. 2020-149880

[0007] Patent Document 3: Japanese Patent Application Publication No. 2020-098712

[0008] Patent Document 4: Japanese Patent Application Publication No. 2020-156148 Summary of the Invention

[0009] Energy storage devices are sometimes charged using a so-called fast charging mode, where a large current is applied for a short period of time. In this mode, the absolute value of the current increases in the large-capacity energy storage device installed in the electric vehicle, and the heat generated follows Joule's law (Q=I). 2 R increases. Therefore, the temperature of the energy storage device is prone to rise during fast charging. According to the inventors' research, it has been newly determined that when the temperature of the energy storage device becomes too high during fast charging, uneven salt concentration occurs in the electrode body, which easily leads to reversible high-speed degradation that temporarily increases internal resistance and reduces capacity.

[0010] The present invention was made in view of the above circumstances, and its main objective is to provide a temperature control device and a temperature control method for energy storage devices that can suppress the reversible high-speed degradation described above.

[0011] The present invention provides a temperature control device for a storage device that is electrically connected to a temperature regulating mechanism for regulating the temperature of the storage device. The temperature control device includes: a first determination unit for determining whether the storage device is undergoing fast charging at a predetermined charging current or higher; a temperature acquisition unit for acquiring the temperature of the storage device; a second determination unit for determining whether the temperature acquired by the temperature acquisition unit exceeds a predetermined upper limit temperature; and a temperature control unit for cooling the storage device using the temperature regulating mechanism when both the first and second determination units determine yes.

[0012] Furthermore, this invention provides a temperature control method for a storage device that is electrically connected to a temperature regulating mechanism for regulating the temperature of the storage device. The temperature control method includes: a first determination step, determining whether the storage device is in fast charging at a predetermined charging current or higher; a temperature acquisition step, acquiring the temperature of the storage device; a second determination step, determining whether the temperature acquired in the temperature acquisition step exceeds a predetermined upper limit temperature; and a temperature control step, whereby, if the determination results of both the first and second determination steps are yes, cooling the storage device using the temperature regulating mechanism.

[0013] In this invention, by controlling the temperature of the energy storage device to prevent it from rising excessively during fast charging, the increase in internal resistance can be suppressed, thereby suppressing the reversible high-speed degradation of the energy storage device. Attached Figure Description

[0014] Figure 1 This is a schematic diagram illustrating an electric vehicle and an example of the electric vehicle being charged.

[0015] Figure 2 This is a functional block diagram of a temperature control device involved in one implementation method.

[0016] Figure 3 This is a flowchart illustrating an example of a control process.

[0017] Figure 4 This is a graph showing the shift in resistance between the comparative example and the embodiment. Detailed Implementation

[0018] Hereinafter, preferred embodiments of the technology disclosed herein will be described with reference to the accompanying drawings. Furthermore, matters requiring implementation of the technology disclosed herein, other than those specifically mentioned in this specification, can be mastered by those skilled in the art based on prior art in this field. The technology disclosed herein can be implemented based on the disclosure herein and common technical knowledge in this field.

[0019] Temperature control device for energy storage equipment

[0020] Figure 1This is a schematic diagram illustrating an electric vehicle 200 and an example of its charging. An example of charging using a charging station 300 as an external power source is shown here. The charging station 300 includes a charging cable 310. The charging cable 310 includes a so-called "normal charging" cable that charges with a relatively small current and a so-called "fast charging" cable that charges with a larger current than normal charging. During charging, the plug of the charging cable 310 is connected to the electric vehicle 200.

[0021] The electric vehicle 200 is, for example, a passenger vehicle such as a battery electric vehicle (BEV) or a hybrid electric vehicle (HEV). However, in other embodiments, the electric vehicle 200 may also be a vehicle other than a passenger vehicle, such as a truck or bus. Additionally, the hybrid electric vehicle may be a plug-in hybrid electric vehicle (PHEV). Although figures are omitted, the electric vehicle 200 of this embodiment is configured to have a port for connecting a charging cable 310 for normal charging and a port for connecting a charging cable 310 for fast charging, thus enabling fast charging. The electric vehicle 200 includes an energy storage device 10, a current sensor 20, a temperature sensor 30, a temperature regulation mechanism 40, and a temperature control device 100. However, the current sensor 20 is not essential and may be omitted in other embodiments.

[0022] The energy storage device 10 is the power source (drive power supply) for the motor of the electric vehicle 200. The energy storage device 10 is configured to be charged via an external power source such as a charging station 300. Typically, the energy storage device 10 is mounted on the electric vehicle 200 as a series of electrically connected energy storage modules. The energy storage device 10 is typically monitored and controlled by the electric vehicle 200's BMU (Battery Monitoring Unit). The energy storage device 10 is configured to handle both a so-called "normal charging mode" (charging with a relatively small current) and a so-called "fast charging mode" (charging with a larger current than the normal charging mode).

[0023] Furthermore, in this specification, "energy storage device" refers to all devices that can be repeatedly charged and discharged, including secondary batteries such as lithium-ion batteries and nickel-metal hydride batteries, and capacitors such as lithium-ion capacitors, pseudo-capacitors, and double-layer capacitors.

[0024] The energy storage device 10 is a secondary battery, specifically a lithium-ion secondary battery. The energy storage device 10 is constructed by housing electrodes (not shown) and an electrolyte within a battery casing. The structure of the energy storage device 10 can be the same as conventional batteries and is not limited in any way. The energy storage device 10 can be a square battery with a cuboid shape. The battery casing can have a generally rectangular upper surface (first surface) with electrode terminals (positive and negative terminals) provided, a pair of long side surfaces facing each other, a pair of short side surfaces facing each other, and a lower surface (second surface) facing the upper surface.

[0025] The current sensor 20 detects the current (charging current I) applied to the energy storage device 10. The current sensor 20 is connected, for example, to the current circuit of the energy storage device 10 (not shown). The structure of the current sensor 20 is not particularly limited. The current sensor 20 may be composed, for example, of electronic components or electronic devices with conventionally known current measurement functions. The current sensor 20 is electrically connected to the temperature control device 100.

[0026] Temperature sensor 30 detects the temperature T of the energy storage device 10. Temperature sensor 30 is mounted, for example, on the outer surface of the energy storage device 10. In one example, temperature sensor 30 is mounted on one side of the battery casing of the energy storage device 10 (e.g., the upper surface where electrode terminals are provided). The structure of temperature sensor 30 is not particularly limited. Temperature sensor 30 is, for example, composed of a temperature-sensing resistor (thermostat), a thermocouple, etc. Temperature sensor 30 is electrically connected to temperature control device 100.

[0027] The temperature regulating mechanism 40 regulates the temperature of the energy storage device 10 at least during rapid charging. The temperature regulating mechanism 40 can regulate the temperature of the energy storage device 10 independently or simultaneously for multiple energy storage devices 10 (energy storage modules). The structure of the temperature regulating mechanism 40 is not particularly limited. The temperature regulating mechanism 40 may, for example, utilize a heat exchange medium to regulate the temperature of the energy storage device 10. The temperature regulating mechanism 40 here serves both a cooling function for cooling the energy storage device 10 and a heating function for heating the energy storage device 10. However, the heating function is not essential and can be omitted in other embodiments. Furthermore, in other embodiments, the cooling and heating functions can be implemented using independent mechanisms. The temperature regulating mechanism 40 is electrically connected to the temperature control device 100.

[0028] In several embodiments, the temperature regulating mechanism 40 is air-cooled. The temperature regulating mechanism 40 may also be configured to have a blower (fan) to cool the energy storage devices 10 by supplying air, after heat has been released by a heat exchanger, into the internal space of the housing that houses the multiple energy storage devices 10 (energy storage modules), or to heat the energy storage devices 10 by supplying air heated by a heat exchanger (e.g., an electric heater).

[0029] In several other embodiments, the temperature regulating mechanism 40 is liquid-cooled. The temperature regulating mechanism 40, for example, has a temperature control plate configured to contact one side of the battery casing of the energy storage device 10 (e.g., the lower surface facing the upper surface where the temperature sensor 30 is located). The temperature regulating mechanism 40 may also be configured to cool the energy storage device 10 by passing a liquid, after heat has been released by a heat exchanger, through the temperature control plate, or to heat the energy storage device 10 by passing a liquid, after heat has been heated by a heat exchanger (e.g., an electric heater), through the temperature control plate.

[0030] The temperature control device 100 is a device for controlling the temperature of the energy storage device 10. Specifically, the temperature control device 100 manages the temperature of the energy storage device 10 installed in the electric vehicle 200. The structure of the temperature control device 100 is not particularly limited; for example, it can be a microcomputer. The microcomputer may include, for example, an interface (I / F) for receiving data from external devices, a central processing unit (CPU) for executing program commands, a ROM (Read Only Memory) storing the program executed by the CPU, RAM (Random Access Memory) used as a working area for program execution, and a memory for storing the aforementioned program or various data. The temperature control device 100 may be included in the BMU of the electric vehicle 200.

[0031] Figure 2 This is a functional block diagram of the temperature control device 100. (Example) Figure 2 As shown, the temperature control device 100 of this embodiment is configured to be electrically connected to the current sensor 20, the temperature sensor 30, and the temperature regulating mechanism 40, and can control them. The temperature control device 100 of this embodiment includes a current acquisition unit 110, a first determination unit 120, a temperature acquisition unit 130, a second determination unit 140, a temperature control unit 150, and a third determination unit 160. However, the current acquisition unit 110 and the third determination unit 160 are not essential; in other embodiments, some or all of them can be omitted.

[0032] The current acquisition unit 110 is configured to control the current sensor 20 to acquire the charging current I of the energy storage device 10. The first determination unit 120 is configured to determine whether the energy storage device 10 is above a predetermined charging current (lower limit charging current I). min In fast charging (as described above), the first determination unit 120 is configured to determine whether fast charging is in progress based on the charging current I obtained by the current acquisition unit 110. Specifically, the first determination unit 120 is configured to determine whether fast charging is in progress when the charging current I is the lower limit charging current I. minWhen the above values ​​are obtained, it is determined that the device is in the process of fast charging. By using actual measured values, it is possible to determine whether the device is in the process of fast charging with greater accuracy.

[0033] Lower limit charging current I min The lower limit charging current I is pre-stored in the temperature control device 100. min Typically, the value that allows the energy storage device 10 to be fully charged within one hour (more preferably within 30 minutes) is determined in advance based on preliminary experiments. For example, since the value may vary depending on the capacity of the energy storage device 10, there is no particular limitation. In one example, the first determination unit 120 may be configured to determine that it is in fast charging when the charging current I is approximately 100A or more, preferably 200A or more (e.g., 200A to 500A). In this case, when the absolute value is large, the heat generated during fast charging becomes very large, and in particular, the temperature of the energy storage device 10 is prone to rise. Therefore, it is particularly preferred to apply the technology disclosed herein.

[0034] The temperature acquisition unit 130 is configured to control the temperature sensor 30 to acquire the temperature T of the energy storage device 10. The second determination unit 140 is configured to determine whether the temperature T acquired by the temperature acquisition unit 130 exceeds a predetermined upper limit temperature (T). max Upper limit temperature T max The upper limit temperature T is pre-stored in the temperature control device 100. max For example, the relationship between the temperature T of the energy storage device 10 and the increase in its internal resistance can be determined in advance through preliminary experiments. From the viewpoint of maximizing the effectiveness of the technology disclosed herein, in several embodiments, the upper limit temperature T... max The preferred setting is a range of 40±5℃. In one example, the upper limit temperature T... max Preferably, the temperature is set to 40°C, and more preferably, it is set to 35°C.

[0035] The temperature control unit 150 is configured to control the temperature regulating mechanism 40 and regulate the temperature of the energy storage device 10 based on the determination results of the first determination unit 120 and the second determination unit 140. Specifically, the temperature control unit 150 is configured such that when the determination result of the first determination unit 120 is "yes" (determined to be in a predetermined fast charging state) and the determination result of the second determination unit 140 is "yes" (determined to be that the temperature T exceeds a predetermined upper limit temperature T), the temperature regulation unit 150 is configured to control the temperature regulating mechanism 40 and regulate the temperature of the energy storage device 10. max In the case of [condition], the energy storage device 10 is cooled by the temperature regulation mechanism 40. As a result, the temperature of the energy storage device 10 is kept below the upper limit temperature T, which is the threshold temperature for the high-temperature side. max By controlling the temperature of the energy storage device 10 to prevent it from rising excessively during fast charging, the increase in internal resistance can be suppressed, thereby suppressing the reversible high-speed degradation of the energy storage device 10.

[0036] The temperature control unit 150 can, for example, cool the energy storage device 10 until the temperature measured by the temperature sensor 30 is lower than the upper limit temperature T. max The temperature regulating mechanism 40 can be controlled in one way or in another way, by cooling the energy storage device 10 for a predetermined period of time.

[0037] In several embodiments, the temperature control unit 150 is configured to respond to a condition determined by the first determination unit 120 as not being in a predetermined fast charging state and / or a condition determined by the second determination unit 140 as not exceeding a predetermined upper limit temperature T. max (This is the upper limit temperature T) max In the following cases, temperature regulation of the energy storage device 10 is not performed (the temperature regulation mechanism 40 is not driven or the status quo is maintained). According to the inventors' research, during fast charging, if the temperature of the energy storage device 10 drops excessively, the internal resistance may increase, making it prone to high-speed degradation (although it will not exceed the upper limit temperature T). max (The degree of the situation). Therefore, the effects of the technology disclosed herein can be easily and stably achieved without temperature regulation. In addition, efficient control can be realized.

[0038] The third determination unit 160 is configured to determine whether the temperature T obtained by the temperature acquisition unit 130 is less than a predetermined lower limit temperature (T0). min Lower limit temperature T min The lower limit temperature T is pre-stored in the temperature control device 100. min For example, the relationship between the temperature T of the energy storage device 10 and the increase in its internal resistance can be determined in advance through preliminary experiments. From the viewpoint of achieving a higher level of stable performance of the technology disclosed herein, in several embodiments, the lower limit temperature T... min The preferred setting is a range of 10 ± 5°C. In one example, the lower limit temperature T... min Preferably, the temperature is set to 5°C, and more preferably, it is set to 15°C.

[0039] In this embodiment, the temperature control unit 150 is configured to further control the temperature adjustment mechanism 40 and adjust the temperature of the energy storage device 10 based on the determination results of the first determination unit 120 and the third determination unit 160. Specifically, the temperature control unit 150 is configured such that when the determination result of the first determination unit 120 is "yes" (determined to be in a predetermined fast charging state) and the determination result of the third determination unit 160 is "yes" (determined to be that the temperature T is less than a predetermined lower limit temperature T),... min In the case of [condition], the energy storage device 10 is heated using the temperature regulation mechanism 40. As a result, the temperature of the energy storage device 10 is higher than the lower limit temperature T, which serves as the threshold for the low-temperature side. minBy controlling the temperature of the energy storage device 10 within an appropriate range in a way that prevents excessive drop during fast charging, the increase in internal resistance can be suppressed more reliably, and the high-speed degradation of the energy storage device 10 can be stably suppressed.

[0040] The temperature control unit 150 can, for example, heat the energy storage device 10 until the temperature measured by the temperature sensor 30 exceeds the lower limit temperature T. min The temperature regulating mechanism 40 can be controlled in one way or by heating the energy storage device 10 for a predetermined time.

[0041] In several embodiments, the temperature control unit 150 is configured to respond to a condition determined by the first determination unit 120 as not being in a predetermined fast charging state and / or a condition determined by the third determination unit 160 as not being lower than a predetermined lower limit temperature T. min (This is the lower limit temperature T) min In the above cases, temperature regulation of the energy storage device 10 is not performed (the temperature regulation mechanism 40 is not driven or the status quo is maintained). Therefore, the effects of the technology disclosed herein can be easily and stably achieved. Furthermore, efficient control can be realized.

[0042] Temperature control methods for energy storage devices

[0043] Figure 3 This is a flowchart of the control process for the temperature control device 100. While the timing of this temperature control is not specifically limited, in several embodiments, the temperature control may be performed when charging of the energy storage device 10 begins. More specifically, for example, when charging is being performed at the charging station 300, a signal is sent from the charging station 300 to the BMU of the electric vehicle 200 when the charging cable 310 is connected to the electric vehicle 200. The temperature control may also begin when the BMU receives this signal from the charging station 300. Furthermore, the temperature control may be performed periodically at predetermined intervals during the charging of the energy storage device 10. Additionally, the temperature control may end when charging of the energy storage device 10 is completed. Furthermore, in the following control statements, "YES" means the same as "yes" and "NO" means the same as "no".

[0044] In the temperature control of this embodiment, firstly, in step S1, the current sensor 20 is controlled by the current acquisition unit 110 to acquire the charging current I of the energy storage device 10. Next, in step S2, the first determination unit 120 determines whether the energy storage device 10 is in fast charging at a current exceeding a predetermined charging current. In this embodiment, the charging current I acquired by the current acquisition unit 110 is a predetermined value (lower limit charging current I). minWhen the current is 200A or higher (in this case, 200A or higher), it is determined that the device is in fast charging mode. In this embodiment, step S1 is an example of a current acquisition process, and step S2 is an example of a first determination process.

[0045] If the energy storage device 10 is not in fast charging (the result of step S2 is "No"), for example, if the energy storage device 10 is in normal charging as described above, or if charging stops due to some kind of malfunction, the temperature regulation of the energy storage device 10 is not performed and the control ends.

[0046] On the other hand, when the energy storage device 10 is in fast charging (the result of step S2 is "yes"), in the next step S3, the temperature sensor 30 is controlled by the temperature acquisition unit 130 to acquire the temperature T of the energy storage device 10. Next, in step S4, the second determination unit 140 determines whether the temperature T of the energy storage device 10 exceeds a predetermined upper limit temperature T. max In this embodiment, step S3 is an example of a temperature acquisition process, and step S4 is an example of a second determination process.

[0047] When the temperature T of the energy storage device 10 exceeds the upper limit temperature T max If the result of step S4 is "yes", in step S5, the temperature control unit 150 controls the temperature regulating mechanism 40, and the temperature regulating mechanism 40 cools the energy storage device 10. In this embodiment, step S5 is an example of a temperature control process.

[0048] On the other hand, the temperature T of the energy storage device 10 does not exceed the upper limit temperature T. max If the result of step S4 is "No", then in step S6, the third determination unit 160 further determines whether the temperature T of the energy storage device 10 is lower than a predetermined lower limit temperature T. min When the temperature T of the energy storage device 10 is less than the lower limit temperature T... min If the result of step S6 is "yes", in step S7, the temperature control unit 150 controls the temperature regulating mechanism 40, and the temperature regulating mechanism 40 heats the energy storage device 10. In this embodiment, step S6 is an example of the third determination process, and step S7 is an example of the second temperature control process.

[0049] On the other hand, the temperature T of the energy storage device 10 is not less than the lower limit temperature T. min If the result of step S6 is "No", the control ends without temperature regulation of the energy storage device 10.

[0050] As described above, according to the temperature control device 100 and temperature control method of the energy storage device 10 disclosed herein, the energy storage device 10, which is in a fast charging state and requires cooling, can be selectively and efficiently cooled. Furthermore, it is preferable that the energy storage device 10, which is in a fast charging state and requires heating, can be selectively and efficiently heated. By adjusting the temperature of the energy storage device 10 to a predetermined temperature range during fast charging, uneven salt concentration (deviation) within the electrode body can be suppressed, and the increase in internal resistance can be suppressed. This, in turn, appropriately suppresses reversible high-speed degradation of the energy storage device 10.

[0051] Figure 4 This is a graph showing the resistance shift of comparative and exemplary devices when subjected to a cyclic test at 25°C using a 200Ah-class energy storage device. In this test example, for each example, after adjusting the energy storage device to 20% SOC, it was charged at a constant current of 250A for 400 seconds, followed by discharging at a constant current of 40A for 2500 seconds. This charge-discharge cycle was repeated for a total of 140 cycles. Furthermore, for every 36 cycles, the energy storage device was adjusted to 60% SOC at 25°C, and the IV resistance was measured when discharging at 240A for 10 seconds. The “Example” applies the techniques disclosed herein, such as... Figure 3 The flowchart illustrates the case where temperature control is performed (specifically, air cooling using a cooling fan). The "Comparative Example" is the case where the technology disclosed herein is not applied (no temperature control). Thus, by performing the temperature control disclosed herein, the increase in internal resistance can be appropriately suppressed during fast charging.

[0052] The embodiments of the present invention have been described above, but these embodiments are merely examples. The present invention can be implemented in various other ways. The present invention can be implemented based on the disclosure in this specification and common technical knowledge in the field. The technology described in the claims includes examples obtained by various modifications and alterations to the embodiments illustrated above.

[0053] For example, in the above Figure 3 In this embodiment, in step S1, the charging current I of the energy storage device 10 is obtained, and in step S2, it is determined whether fast charging is in progress based on the charging current I (measured value). However, this is not a limitation. In a variation, for example, it may be determined that fast charging is in progress when the charging cable 310 is connected to the fast charging port of the electric vehicle 200 and a signal indicating fast charging is received from the charging pile 300.

[0054] As described above, the following specific solutions can be cited as examples of the technologies disclosed herein.

[0055] Item 1: A temperature control device for an energy storage device, which is electrically connected to a temperature regulating mechanism for regulating the temperature of the energy storage device, comprising: a first determination unit for determining whether the energy storage device is in fast charging at a predetermined charging current or higher; a temperature acquisition unit for acquiring the temperature of the energy storage device; a second determination unit for determining whether the temperature acquired by the temperature acquisition unit exceeds a predetermined upper limit temperature; and a temperature control unit for cooling the energy storage device using the temperature regulating mechanism when both the determination results of the first determination unit and the second determination unit are yes.

[0056] Item 2: The temperature control device for the energy storage device described in Item 1, wherein the first determination unit determines that the device is in the fast charging process when the charging current is 200A or more.

[0057] Item 3: The temperature control device for the energy storage device described in Item 1 or 2, further comprising a current acquisition unit for acquiring the charging current of the energy storage device, wherein the first determination unit determines whether the device is in the fast charging process based on the charging current acquired by the current acquisition unit.

[0058] Item 4: A temperature control device for an energy storage device according to any one of items 1 to 3, wherein the upper limit temperature is set to a range of 40±5°C.

[0059] Item 5: A temperature control device for an energy storage device according to any one of items 1 to 4, wherein the device further comprises a third determination unit that determines whether the temperature obtained by the temperature acquisition unit is lower than a predetermined lower limit temperature, and the temperature control unit heats the energy storage device using the temperature adjustment mechanism when the determination results of the first determination unit and the third determination unit are both yes.

[0060] Item 6: The temperature control device for the energy storage device described in Item 5, wherein the lower limit temperature is set to a range of 10±5°C.

[0061] Item 7: A temperature control device for an energy storage device according to any one of items 1 to 4, wherein the temperature control unit does not drive the temperature adjustment mechanism if the determination result of at least one of the first determination unit and the second determination unit is negative.

[0062] Item 8: The temperature control device for the energy storage device according to Item 5 or 6, wherein the temperature control unit does not drive the temperature adjustment mechanism if the determination result of at least one of the first determination unit and the third determination unit is negative.

[0063] Item 9: A method for controlling the temperature of a storage device electrically connected to a temperature regulating mechanism for regulating the temperature of the storage device, comprising: a first determination step, determining whether the storage device is in fast charging at a predetermined charging current or higher; a temperature acquisition step, acquiring the temperature of the storage device; a second determination step, determining whether the temperature acquired in the temperature acquisition step exceeds a predetermined upper limit temperature; and a temperature control step, wherein if the determination results of the first determination step and the second determination step are both yes, the storage device is cooled using the temperature regulating mechanism.

Claims

1. A temperature control device for an energy storage device, electrically connected to a temperature regulating mechanism that regulates the temperature of the energy storage device, the temperature control device comprising: The first determination unit determines whether the energy storage device is in a fast charging process where it is being charged with a current greater than or equal to a predetermined charging current. The temperature acquisition unit acquires the temperature of the energy storage device; The second determination unit determines whether the temperature obtained by the temperature acquisition unit exceeds a predetermined upper limit temperature; and The temperature control unit cools the energy storage device using the temperature adjustment mechanism when both the first determination unit and the second determination unit determine that the result is yes.

2. The temperature control device for the energy storage device according to claim 1, wherein, The first determination unit determines that the device is in the fast charging process when the charging current is 200A or higher.

3. The temperature control device for the energy storage device according to claim 2, wherein, It also includes a current acquisition unit for acquiring the charging current of the energy storage device. The first determination unit determines whether it is in the fast charging process based on the charging current obtained by the current acquisition unit.

4. The temperature control device for the energy storage device according to claim 1, wherein, The upper limit temperature is set to a range of 40±5℃.

5. The temperature control device for the energy storage device according to claim 1, wherein, It also includes a third determination unit that determines whether the temperature obtained by the temperature acquisition unit is lower than a predetermined lower limit temperature. When the determination results of the first determination unit and the third determination unit are both yes, the temperature control unit uses the temperature adjustment mechanism to heat the energy storage device.

6. The temperature control device for the energy storage device according to claim 5, wherein, The lower limit temperature is set to a range of 10±5℃.

7. The temperature control device for the energy storage device according to claim 1, wherein, If the temperature control unit determines that at least one of the first determination unit and the second determination unit is negative, the temperature control unit will not drive the temperature adjustment mechanism.

8. The temperature control device for the energy storage device according to claim 5, wherein, If the temperature control unit determines that at least one of the first determination unit and the third determination unit is negative, the temperature control unit will not drive the temperature adjustment mechanism.

9. A method for controlling the temperature of a storage device electrically connected to a temperature regulating mechanism for regulating the temperature of the storage device, comprising: The first determination step is to determine whether the energy storage device is in a fast charging process where it is being charged with a current greater than or equal to a predetermined charging current. The temperature acquisition process involves acquiring the temperature of the energy storage device. The second determination step determines whether the temperature obtained in the temperature acquisition step exceeds a predetermined upper limit temperature; and In the temperature control process, if the determination results of the first determination process and the second determination process are both yes, the temperature adjustment mechanism is used to cool the energy storage device.

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