Safety processing device for battery pack, electrical energy storage device, and control method thereof

Abstract

The present invention discloses a safety processing device for a battery pack, an electric energy storage device, and a control method thereof. The safety processing device includes a temperature detection module for collecting cell temperature changes of each cell in the battery pack, a temperature control module for determining whether the maximum cell temperature change of the battery pack is within one of a plurality of temperature change ranges, and if so, for generating a temperature control command including a battery pack processing method according to a temperature change range including the maximum cell temperature change, and a safety prevention module for executing the temperature control command. By detecting the maximum cell temperature change of the battery pack and processing the battery pack according to a processing method corresponding to the temperature change range including the maximum cell temperature change of the battery pack, it is possible to proactively and effectively prevent the battery pack from becoming uncontrollable and avoid irrecoverable losses.

Description

Technical Field

[0001] This application claims the priority of Chinese Patent Application No. 201910566870.8, with an application date of June 27, 2019. This application incorporates the entire text of the above Chinese patent application by reference.

[0002] The present invention relates to the field of storing electrical energy, and particularly to a safety processing device for a battery pack, an electrical energy storage device, and a control method thereof.

Background Art

[0003] An electrical energy storage device is a system capable of storing and providing electrical energy, and has functions such as smooth transition, peak cut, modulation, and voltage regulation. As new materials for lithium-ion batteries are developed, with the innovation of battery manufacturing technology and the participation of many scientific research institutions and enterprises, the performance of lithium-ion batteries is continuously improving, the cost of batteries is continuously decreasing, and the safety of batteries is also significantly enhanced. Lithium-ion batteries are gradually showing their application advantages in the field of energy storage.

[0004] However, lithium batteries have the disadvantages of low voltage and small capacity of a single cell, and thousands of cells are required for an energy storage system applied to industrialization. At the same time, lithium batteries have poor performance at low temperatures, and in case of abuse conditions such as overcharging, short circuit, pressing, puncturing, vibration, high temperature, and thermal shock, dangerous behaviors such as explosion and combustion are extremely likely to occur.

[0005] In the prior art, when a battery management system collects and processes temperature, voltage, and current of a battery and uses passive fire protection equipment for monitoring and prevention, there is a problem that thermal control cannot be achieved, and a single battery module that cannot perform thermal control cannot be effectively processed, which may cause significant losses that cannot be compensated for the energy storage system.

Summary of the Invention

Problems to be Solved by the Invention

[0006] In the prior art, in order to overcome the defect of adopting a passive safety measure in an electric energy storage device, the present invention aims to solve the technical problem of providing a safety processing device for a battery pack, an electric energy storage device, and a control method thereof.

Means for Solving the Problems

[0007] The present invention solves the above technical problems by the following technical means.

[0008] The safety processing device for a battery pack includes a temperature detection module for collecting the cell temperature change of each cell in the battery pack, and a temperature control module that determines whether the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges, and when it is determined that it is included, generates a temperature control command according to the temperature change range including the maximum cell temperature change, wherein different temperature change ranges correspond to different processing methods for the battery pack, and the temperature control command includes those for processing the battery pack according to the processing method corresponding to the included temperature change range, and a safety prevention module for executing the temperature control command, which is characterized by the above.

[0009] Preferably, the processing method includes isolation, and the safety prevention module includes isolation means for pushing the battery pack out by a predetermined distance.

[0010] Preferably, the isolation means includes any one of an elastic member, a push rod member, and an airbag member.

[0011] Preferably, the processing method includes power-off, and the safety prevention module includes switch means for cutting off the electrical connection of the battery pack.

[0012] Preferably, the processing method includes a temperature drop, and the safety prevention module includes a temperature drop means for causing the battery pack to experience a temperature drop.

[0013] The electrical energy storage device is The electrical energy storage device includes a temperature control module, a safety prevention module, and one or more battery boxes. The battery box is provided with a battery pack and a temperature detection module. The battery pack includes one or more cells. The temperature detection module is for collecting the cell temperature changes of each cell in the battery pack. The temperature control module determines whether the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges. When it is determined that it is included, a temperature control command is generated according to the temperature change range including the maximum cell temperature change. Among them, different temperature change ranges correspond to different processing methods of the battery pack. The temperature control command is for processing the battery pack according to the included temperature change range and the corresponding processing method. The safety prevention module is for executing the temperature control command, which is characterized in that.

[0014] Preferably, the temperature detection module is specifically for collecting the local cell temperature changes at a plurality of local positions of each cell in the battery pack. The temperature control module is specifically for determining whether the maximum local cell temperature change in the battery pack is included in one of a plurality of temperature change ranges. When it is determined that it is included, it is specified that the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges.

[0015] Preferably, the processing method includes isolation. The battery box includes a door. The safety prevention module includes a trigger mechanism provided on the battery box. The trigger mechanism is installed opposite to the door. The battery pack is installed between the door and the trigger mechanism. Specifically, the temperature control module is configured to determine whether the maximum cell temperature change in the battery pack is within a first temperature change range, and if it is determined that it is within the range, generate a first temperature control command. For the first battery box provided with a first battery pack including cells whose maximum cell temperature change is within the first temperature change range, the door opens according to the first temperature control command. The trigger mechanism in the first battery box pushes out the first battery pack from the first battery box according to the first temperature control command.

[0016] Preferably, the trigger mechanism includes any one of an elastic member, a push rod member, and an airbag member. The elastic member in the first battery box is configured to be ejected according to the first temperature control command to push out the first battery pack from the first battery box. The push rod member in the first battery box is configured to be pushed according to the first temperature control command to push out the first battery pack from the first battery box. The airbag member in the first battery box is configured to be filled with gas according to the first temperature control command to push out the first battery pack from the first battery box.

[0017] Preferably, one or more rolling bearings are provided at the bottom of the battery box, and the battery pack is provided on the one or more rolling bearings.

[0018] Preferably, when the minimum value of the first temperature change range is set as a first threshold, the value range of the first threshold is 20 - 22°C.

[0019] Preferably, the safety prevention module includes one or more power conversion systems (Power Conversion System). Each battery pack is electrically connected to the power conversion system. Each power conversion system is at least electrically connected to the battery pack.

[0020] Preferably, the processing method includes power-off, and the temperature control module is specifically for determining whether the maximum cell temperature change in the battery pack is included in a second temperature change range. When it is determined that it is included, a second temperature control command is generated, and the second temperature control command includes cutting off the electrical connection of a second battery pack including cells in the second temperature change range including the maximum cell temperature change. The power conversion system electrically connected to the second battery pack is for executing the second temperature control command.

[0021] Preferably, when the minimum value of the second temperature change range is used as a second threshold, the value range of the second threshold is set to 10 to 12 °C.

[0022] Preferably, the battery box is provided above the power conversion system, and a heat insulation layer is provided between the battery box and the power conversion system.

[0023] Preferably, the safety prevention module includes one or more air exchange devices for realizing heat exchange between the electrical energy storage device and the external air.

[0024] Preferably, the processing method includes temperature drop, and the temperature control module is specifically for determining whether the maximum cell temperature change in the battery pack is included in a third temperature change range. When it is determined that it is included, a third temperature control command is generated. The air exchange device is activated according to the third temperature control command.

[0025] Preferably, when the minimum value of the third temperature change range is used as a third threshold, the value range of the third threshold is set to 5 to 7 °C.

[0026] Preferably, the electrical energy storage device further includes a temperature field detection module for detecting the temperature field in the electrical energy storage device. The temperature control module is further for determining whether the maximum temperature difference in the temperature field is greater than a fourth threshold value. When it is determined to be greater, a fourth temperature control command is generated. The air exchange device is activated according to the fourth temperature control command.

[0027] Preferably, the value range of the fourth threshold value is set to 5 to 7 °C.

[0028] Preferably, each of the one or more air exchange devices is provided at a position close to the tip of the electric energy storage device and the power conversion system, respectively.

[0029] A control method for an electric energy storage device, wherein the electric energy storage device includes one or more battery boxes, battery packs are provided in the battery boxes, the battery packs include one or more cells, and the control method includes: Collecting the cell temperature changes of each cell in the battery pack. Determining whether the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges, wherein different temperature change ranges correspond to different processing methods for the battery pack. When it is determined to be included, processing the battery pack according to the processing method corresponding to the temperature change range including the maximum cell temperature change.

[0030] Preferably, the step of collecting the cell temperature changes of each cell in the battery pack is: Collecting the local cell temperature changes at a plurality of local positions of each cell in the battery pack. The step of determining whether the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges is: Determining whether the maximum local cell temperature change in the battery pack is included in one of a plurality of temperature change ranges, and When it is determined to be included, specifying that the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges.

[0031] Preferably, the processing method includes isolation, the battery box includes a door, the battery box further includes a trigger mechanism, the trigger mechanism is installed opposite to the door, the battery pack is provided between the door and the trigger mechanism, and the step of determining whether the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges is: Determining whether the maximum cell temperature change in the battery pack is included in a first temperature change range; When it is determined to be included, opening the door of the first battery box provided with the first battery pack including the cells in the first temperature change range including the maximum cell temperature change, and the trigger mechanism pushing the first battery pack out of the first battery box.

[0032] Preferably, when the minimum value of the first temperature change range is set as a first threshold value, the value range of the first threshold value is 20 - 22°C.

[0033] Preferably, the processing method includes power failure, the electrical energy storage device further includes one or more power conversion systems, each battery pack is electrically connected to a power conversion system, each power conversion system is electrically connected to at least a battery pack, and the step of determining whether the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges is: Determining whether the maximum cell temperature change in the battery pack is included in a second temperature change range; When it is determined to be included, disconnecting the electrical connection of the power conversion system electrically connected to the second battery pack including the cells in the second temperature change range including the maximum cell temperature change.

[0034] Preferably, when the minimum value of the second temperature change range is set as a second threshold value, the value range of the second threshold value is 10 - 12°C.

[0035] Preferably, the processing method includes a temperature drop, and the electrical energy storage device further includes one or more air exchange devices for realizing heat exchange between the electrical energy storage device and the external air. The step of determining whether the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges is as follows: Determining whether the maximum cell temperature change in the battery pack is included in a third temperature change range, and When it is determined that it is included, starting the air exchange device.

[0036] Preferably, if the minimum value of the third temperature change range is taken as a third threshold value, the value range of the third threshold value is set to 5 to 7 °C.

[0037] Preferably, the electrical energy storage device further includes one or more air exchange devices for realizing heat exchange between the electrical energy storage device and the external air. The control method includes: Detecting the temperature field in the electrical energy storage device, Determining whether the maximum temperature difference in the temperature field is greater than a fourth threshold value, and When it is determined that it is greater, starting the air exchange device.

[0038] Preferably, the value range of the fourth threshold value is set to 5 to 7 °C.

Advantages of the Invention

[0039] The positive progress and effects of the present invention are that the present invention actively detects the maximum cell temperature change in the battery pack and processes the battery pack according to a processing method corresponding to a temperature change range including the maximum cell temperature change in the battery pack. Therefore, it can effectively prevent the heat of the battery pack from getting out of control and avoid irreparable losses.

Brief Description of the Drawings

[0040]

Figure 1

Figure 2

Figure 3

Figure 4

Figure 5

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Figure 8

Figure 9

Embodiments for Carrying Out the Invention

[0041] Hereinafter, the present invention will be described in detail based on the embodiments, but the present invention is not thereby limited to the scope of the above embodiments. First Embodiment

[0042] This embodiment provides a safety processing device for a battery pack. FIG. 1 is a schematic diagram of a module showing this embodiment. Referring to FIG. 1, the safety processing device according to this embodiment includes a temperature detection module 11, a temperature control module 12, and a safety prevention module 13. Specifically, in this embodiment, the temperature detection module 11 is for collecting the cell temperature changes of each cell in the battery pack. Among them, a temperature sensor such as an optical fiber temperature sensor may be adopted for the temperature detection module 11. The cell temperature changes may include the temperature rise or temperature difference of the cell, but are not limited thereto.

[0043] The temperature control module 12 is for determining whether the maximum cell temperature change among all cell temperature changes in the battery pack collected by the temperature detection module 11 is included in one of a plurality of temperature change ranges. Among them, each temperature change range may be customized and set according to the actual application scenario. Also, different temperature change ranges correspond to different processing methods for different battery packs. When it is determined that the temperature control module 12 is included, a temperature control command is generated according to the temperature change range including the maximum cell temperature change, and the temperature control command includes those for processing the battery pack according to the processing method corresponding to the included temperature change range.

[0044] The safety prevention module 13 is for performing the temperature control command generated by the temperature control module 12 and processing the battery pack according to the processing method corresponding to the temperature change range including the maximum cell temperature change, so as to play a role in safety prevention for the battery pack.

[0045] In this embodiment, the methods for processing the battery pack include, but are not limited to, temperature drop, power-off, and isolation. Among them, temperature drop, power-off, and isolation play an increasingly important role in preventing the battery pack from being damaged. Therefore, the temperature change ranges corresponding to the three processing methods of temperature drop, power-off, and isolation change from the lowest to the highest. Specifically, FIG. 2 shows the relationship between the above three processing methods and the temperature change range. Since the cell temperature change must include the process of changing from small to large as the battery pack is used, for a plurality of predetermined temperature change ranges, there are three combined processing methods: a processing method of lowering the temperature of the battery pack (the temperature change range corresponding to the case where it corresponds to temperature drop but not to power-off), a processing method of cutting off the power while lowering the temperature of the battery pack (the temperature change range corresponding to the case where it corresponds to power-off but not to isolation), and a processing method of isolating the battery pack when cutting off the power while lowering the temperature of the battery pack (the temperature change range corresponding to the case where it corresponds to isolation).

[0046] Specifically, the safety prevention module 13 includes a temperature drop means 131. When the processing method corresponding to the temperature change range including the maximum cell temperature change is temperature drop, the temperature drop means 131 is used to lower the temperature of the battery pack to perform safety prevention from the outside of the battery pack and avoid further increase in the temperature of the battery pack.

[0047] The safety prevention module 13 further includes switching means 132. When the processing method corresponding to the temperature change range including the maximum cell temperature change is power-off, the switching means 132 is used to cut off the electrical connection of the battery pack to prevent the battery pack from continuously dissipating heat during the discharge process and causing thermal hazards. Or, when the minimum value of the temperature change range corresponding to the power-off processing method is greater than the minimum value of the temperature change range corresponding to the temperature drop processing method, since the current maximum cell temperature is also included in the temperature change range where the processing method is temperature drop, even if the temperature drop processing method is used, it is impossible to prevent the temperature change of the cell from rising further, and it can be understood that it is necessary to cut off the power while lowering the temperature of the battery pack.

[0048] The safety prevention module 13 further includes isolation means 133. When the processing method corresponding to the temperature change range including the maximum cell temperature change is isolation, the isolation means 133 is used to push the battery pack by a predetermined distance. Among them, the predetermined distance may be set according to the actual position where the battery pack is placed. And the battery pack can be prevented from being affected by the safety due to the power being used by the electrical modules located around it due to circumstances such as a fire occurring at its original placement position. In this embodiment, the isolation means 133 includes an elastic member, a push rod member, an airbag member, etc., but is not limited thereto.

[0049] In this embodiment, by detecting the maximum cell temperature change in the battery pack and processing the battery pack according to the processing method corresponding to the temperature change range including the maximum cell temperature change in the battery pack, it is possible to effectively prevent the heat of the battery pack from getting out of control and avoid irreparable losses.

[0050] Second Embodiment This embodiment provides an electrical energy storage device. FIG. 3 is a schematic diagram of the module showing this embodiment. Referring to FIG. 3, the electrical energy storage device according to this embodiment includes a temperature control module 21, a safety prevention module 22, and one or more battery boxes 23.

[0051] Referring to FIG. 3, in this embodiment, in the battery box 23, a battery pack 231 including one or more cells and a temperature detection module 232 for collecting the cell temperature changes of each cell in the battery pack 231 are provided. Among them, the temperature detection module 232 may include a temperature sensor such as an optical fiber temperature sensor, and the cell temperature changes include, but are not limited to, the temperature rise or temperature difference of the cell.

[0052] The temperature control module 21 is for determining whether the maximum cell temperature change among all cell temperature changes in the battery pack 231 collected by the temperature detection module 232 is included in one of a plurality of temperature change ranges. Among them, different temperature change ranges may correspond to different processing methods for different battery packs. If the temperature control module 21 determines that it is included, a temperature control command is generated according to the temperature change range including the maximum cell temperature change, and the temperature control command includes those for processing the battery pack 231 according to the processing method corresponding to the included temperature change range.

[0053] The safety prevention module 22 is for executing the temperature control command generated by the temperature control module 21 and processing the battery pack 231 according to the processing method corresponding to the temperature change range including the maximum cell temperature change, so as to play a role in preventing the battery pack from being unsafe.

[0054] In this embodiment, specifically, the temperature detection module 232 is for collecting the local cell temperature changes at a plurality (for example, five or more) of local positions of each cell in the battery pack 231. Specifically, the temperature control module 21 is for determining whether the maximum local cell temperature change among all local cell temperature changes in the battery pack 231 is included in one of a plurality of temperature change ranges. If it is determined that it is included, it is for specifying that the maximum cell temperature change in the battery pack 231 is included in one of a plurality of temperature change ranges. Therefore, in this embodiment, it becomes more sensitive to the change of the cell temperature and can feedback the cell temperature change more accurately.

[0055] In this embodiment, the third temperature change range, the second temperature change range, and the first temperature change range in which the minimum value changes from a small value to a large value may be preset to correspond to the battery pack processing methods of temperature drop, power-off, and isolation, respectively. It should be understood that the three temperature change ranges and the three battery pack processing methods according to this embodiment are only for explaining this embodiment and not for limitation. Further, in this embodiment, temperature drop, power-off, and isolation play an increasingly important role in preventing battery packs from being damaged. Since the cell temperature change must change from small to large as the battery pack is used, and includes a process in which the cell temperature change necessarily changes from small to large as the battery pack is used, the predetermined third temperature change range, the second temperature change range, and the first temperature change range respectively correspond to the three combined processing methods: the processing method of dropping the temperature of the battery pack, the processing method of cutting off the power while dropping the temperature of the battery pack, and the processing method of isolating the battery pack when cutting off the power while dropping the temperature of the battery pack.

[0056] Referring to FIG. 3, in this embodiment, the safety prevention module 22 includes one or more air exchange devices 221 for realizing heat exchange between the electrical energy storage device and the external air, and performs safety prevention from the outside of the battery pack 231 to avoid further increase in the temperature of the battery pack 231.

[0057] Specifically, in this embodiment, the temperature control module 21 determines whether the maximum cell temperature change in the battery pack 231 is included in the third temperature change range. Among them, when the minimum value of the third temperature change range is used as the third threshold, the value range of the third threshold may be set to 5-7°C. When the temperature control module 21 determines that it is included, it generates a third temperature control command, and the air exchange device 221 is activated according to the third temperature control command to perform heat exchange between the electrical energy storage device and the external air, and drops the temperature of the battery pack 231.

[0058] Referring to FIG. 3, in this embodiment, the safety prevention module 22 further includes one or more power conversion systems 222. FIG. 4 is a diagram showing the circuit connection between the power conversion system 222 and the battery pack 231. Among them, each battery pack 231 is electrically connected to the power conversion system 222, and each power conversion system 222 is at least electrically connected to the battery pack 231. Therefore, the power conversion system 222 can independently control a plurality of battery packs 231.

[0059] Specifically, in order to prevent the cell temperature change from further increasing while reducing the temperature of the battery pack 231, the temperature control module 21 further determines whether the maximum cell temperature change in the battery pack 231 is included in the second temperature change range. Among them, if the minimum value of the second temperature change range is set as the second threshold value, the value range of the second threshold value may be set to 10-12°C. When the temperature control module 21 determines that it is included, it generates a second temperature control command for disconnecting the electrical connection of the second battery pack including the cells in the second temperature change range including the maximum cell temperature change. The power conversion system 222 electrically connected to the second battery pack executes the second temperature control command to disconnect the electrical connection of the second battery pack, in order to prevent the second battery pack from generating a thermal risk by continuously dissipating heat during the discharging process. It should be understood that even if the temperature reduction processing method is used, the increase in the cell temperature change cannot be suppressed. Therefore, the power supply may be cut off while reducing the temperature of the battery pack.

[0060] Referring to FIG. 3, in this embodiment, the battery box 23 further includes a door 233, the safety prevention module 22 further includes a trigger mechanism 223 provided in the battery box 23, the trigger mechanism 223 is installed opposite to the door 233, and the battery pack 231 is provided between the door 233 and the trigger mechanism 223.

[0061] Specifically, when disconnecting the electrical connection of the power conversion system 222 while lowering the temperature of the battery pack 231, in order to avoid further increase in the cell temperature change, the temperature control module 21 further determines whether the maximum cell temperature change in the battery pack 231 is included in the first temperature change range. Among them, if the minimum value of the first temperature change range is taken as the first threshold value, the value range of the first threshold value may be set to 20 - 22°C. When the temperature determination module 21 determines that it is included, it generates a first temperature control command, and the door of the first battery box provided with the first battery pack including the cells in the first temperature change range including the maximum cell temperature change opens according to the first temperature control command. Moreover, the trigger mechanism 223 in the first battery box pushes out the first battery pack from the first battery box according to the first temperature control command, realizing physical isolation between the first battery pack and the first battery box. As a result, it is possible to avoid the first battery pack affecting the power being used by other electrical modules in the electrical energy storage device located around the first battery box due to a fire occurring in the first battery box.

[0062] Furthermore, in this embodiment, the trigger mechanism 223 may include any one of an elastic member, a push rod member, and an airbag member. Among them, the elastic member is for being ejected according to the first temperature control command to push out the first battery pack from the first battery box; the push rod member is for being pushed according to the first temperature control command to push out the first battery pack from the first battery box; the airbag member is for being filled with gas according to the first temperature control command to push out the first battery pack from the first battery box. Also, in this embodiment, one or more rolling bearings are further provided at the bottom of the battery box 23, and the battery pack 231 is provided on one or more rolling bearings. When the trigger mechanism 223 is triggered according to the first temperature control command, it is easy to push out the first battery pack from the first battery box, and thus the safety of the electrical energy storage device is further enhanced.

[0063] Referring to FIG. 3, in this embodiment, the electrical energy storage device further includes a temperature field detection module 24 for detecting the temperature field within the electrical energy storage device. The temperature control module 21 is for further determining whether the maximum temperature difference in the temperature field is greater than a fourth threshold value. Among them, the fourth threshold value may be customized and set according to the actual application. In this embodiment, the value range of the fourth threshold value may be set to 5 to 7°C. When it is determined that the temperature control module 21 is included, a fourth temperature control command is generated. The air exchange device 221 is activated according to the fourth temperature control command, and thus, heat exchange between the electrical energy storage device and the external air is performed to lower the temperature of the battery pack 231. And in this embodiment, the air exchange device 221 may be activated according to the third temperature control command generated by detecting the cell temperature change in the battery pack 231, or may be activated according to the fourth command generated by detecting the temperature field where the electrical energy storage device is located.

[0064] In this embodiment, the battery pack 231 is stored in the battery storage part, and FIG. 5 is a schematic diagram showing the partial configuration of the battery storage part in this embodiment. Referring to FIG. 5, the battery storage part includes the battery pack 231, a trigger mechanism 223, and a power conversion system cabinet. Among them, the battery pack 231 may be provided on the upper part of the power conversion system cabinet, or may be provided in the battery box 23. The power conversion system 222 may be provided in the power conversion system cabinet. That is, in this embodiment, the battery box 23 may be provided on the upper part of the power conversion system 222. Also, in this embodiment, a heat insulation layer may be provided between the battery box 23 and the power conversion system 222.

[0065] FIG. 6 is a schematic diagram showing the configuration of the electrical energy storage device according to this embodiment. Referring to FIG. 6, the electrical energy storage device may be configured as a box body. Among them, the electrical energy storage device may include a battery storage section and one or more air exchange devices 221. In this embodiment, a power conversion system (not shown) is provided below the battery storage section, and air exchange devices 221 are provided at the tip of the electrical energy storage device and at positions close to the power conversion system, respectively. As a result, a heat exchange passage is formed in the remaining space in the electrical energy storage device, and air exchange can be realized cyclically, and energy consumption can be reduced compared with the conventional method of adjusting and controlling the temperature by air conditioning.

[0066] In this embodiment, the maximum cell temperature change in the battery pack is detected, and the battery pack is processed according to the processing method corresponding to the temperature change range including the maximum cell temperature change in the battery pack, so as to effectively prevent the heat of the battery pack from becoming uncontrollable and avoid irreparable losses.

[0067] Third Embodiment This embodiment provides a control method for an electrical energy storage device. Among them, the electrical energy storage device includes one or more battery boxes, the battery boxes are provided with battery packs, and the battery packs include one or more cells. FIG. 7 is a flowchart of this embodiment. Referring to FIG. 7, the control method according to this embodiment includes S101 of collecting the cell temperature change of each cell in the battery pack, S102 of determining whether the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges, S103 of processing the battery pack according to the processing method corresponding to the temperature change range including the maximum cell temperature change when it is determined that it is included.

[0068] In this embodiment, the cell temperature change includes, but is not limited to, the temperature rise and temperature difference of the cell. Referring to FIG. 8, step S101 may include S101A of collecting local cell temperature changes at a plurality of local positions of each cell in the battery pack. Among them, for each cell, at least five local cell temperature changes may be collected. Step S102 may further include S102A of determining whether the maximum local cell temperature change in the battery pack is included in one of a plurality of temperature change ranges. If it is determined that it is included, the process proceeds to S102B of specifying that the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges.

[0069] Therefore, in this embodiment, it becomes more sensitive to the change in cell temperature, and the cell temperature change can be more accurately fed back.

[0070] In this embodiment, a third temperature change range, a second temperature change range, and a first temperature change range in which the minimum value changes from a small value to a large value may be preset to correspond to the processing methods of the battery pack, namely temperature drop, power-off, and isolation, respectively. It should be understood that the three temperature change ranges and the three processing methods of the battery pack according to this embodiment are only for explaining this embodiment and are not for limitation. Also, in this embodiment, temperature drop, power-off, and isolation play an increasingly important role in preventing the battery pack from being damaged. As the cell temperature change gradually increases during the use of the battery pack, the predetermined third temperature change range, second temperature change range, and first temperature change range respectively correspond to three combined processing methods: a processing method of lowering the temperature of the battery pack, a processing method of cutting off the power while lowering the temperature of the battery pack, and a processing method of isolating the battery pack when cutting off the power while lowering the temperature of the battery pack.

[0071] In this embodiment, the electrical energy storage device further includes one or more air exchange devices for realizing heat exchange between the electrical energy storage device and the external air, performing safety prevention from outside the battery pack, and avoiding further increase in the temperature of the battery pack. In this embodiment, the electrical energy storage device may further include one or more power conversion systems. Each battery pack is electrically connected to the power conversion system, and each power conversion system is at least electrically connected to the battery pack, so that the power conversion system can independently control a plurality of battery packs. In this embodiment, the battery box may include a door. The battery box further includes a trigger mechanism, the trigger mechanism is installed opposite to the door, and the battery pack is provided between the door and the trigger mechanism.

[0072] As described above, referring to FIG. 9, step S102 specifically includes S1021, S1022, S1023, S1024, S1025, and S1026. S1021 determines whether the maximum cell temperature change in the battery pack is included in the third temperature change range. If it is determined that it is included, the process proceeds to step S1022; otherwise, the process returns to step S1021. S1022 activates the air exchange device. S1023 determines whether the maximum cell temperature change in the battery pack is included in the second temperature change range. If it is determined that it is included, the process proceeds to step S1024; otherwise, the process returns to step S1021. S1024 disconnects the electrical connection of the second battery pack to which the power conversion system electrically connected to the second battery pack including the cells in the second temperature change range including the maximum cell temperature change is connected. S1025 determines whether the maximum cell temperature change in the battery pack is included in the first temperature change range. If it is determined that it is included, the process proceeds to step S1026; otherwise, the process returns to step S1023. S1026 opens the door of the first battery box provided with the first battery pack including the cells in the first temperature change range including the maximum cell temperature change, and the trigger mechanism pushes the first battery pack out of the first battery box.

[0073] In this embodiment, for the third temperature change range, the second temperature change range, and the first temperature change range, their minimum values are the third threshold, the second threshold, and the first threshold respectively, among which, the value range of the third threshold is set to 5 - 7 °C, the value range of the second threshold is set to 10 - 12 °C, and the value range of the first threshold is set to 20 - 22 °C.

[0074] When the temperature of the battery pack is decreased through step S1022, along with the discharge of the battery pack, the maximum cell temperature change drops and then rises again, and there is a risk of disconnecting the electrical connection of the battery pack through step S1024 due to being included in the second temperature change range. And even if the temperature decrease processing method is used, it is impossible to prevent the further increase in the cell temperature change. To prevent the occurrence of thermal hazards due to the continuous heat dissipation of the battery pack during the discharge process and to avoid the further increase in the cell temperature change, it is also possible to cut off the power while decreasing the temperature of the battery pack.

[0075] After passing through step S1024, if the maximum cell temperature change still increases and is further included in the first temperature change range, and it is necessary to further take safety precautions to prevent spontaneous ignition of the battery pack with the power cut off, then through step S1026, physical isolation between the battery pack and the battery box is realized, so as to prevent the battery pack from affecting the safety of the power used by other electrical modules in the electrical energy storage device located around the battery box due to spontaneous ignition in the battery box.

[0076] In this embodiment, when it is determined that it is included in step S1021, the air exchange device is activated. This is based on the detection of the cell temperature change in the battery pack. Further, in this embodiment, the air exchange device may also be activated according to the detection of the temperature field where the electrical energy storage device is located. And the control method according to this embodiment may further include the step of detecting the temperature field in the electrical energy storage device, determining whether the maximum temperature difference in the temperature field is greater than the fourth threshold, and if it is determined to be greater, activating the air exchange device.

[0077] Among them, the value range of the fourth threshold value may be set to 5 to 7°C.

[0078] In this embodiment, by detecting the maximum cell temperature change in the battery pack and processing the battery pack according to the processing method corresponding to the temperature change range including the maximum cell temperature change in the battery pack, it is possible to effectively prevent the heat of the battery pack from becoming uncontrollable and avoid irreparable losses.

[0079] As described above, the specific embodiments of the present invention have been described. However, it should be understood by those skilled in the art that these are merely illustrative descriptions, and the protection scope of the present invention is limited by the scope of the claims. For those skilled in the art, various changes and modifications can be made to these embodiments without departing from the principle and spirit of the present invention. However, any of these changes and modifications are included in the protection scope of the present invention.

Claims

1. A safety processing device for a battery pack, comprising: a temperature detection module for collecting the cell temperature changes of each cell in the battery pack; judging whether the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges, and if it is judged to be included, generating a temperature control command according to the temperature change range including the maximum cell temperature change, wherein different temperature change ranges correspond to different processing methods of the battery pack; the processing methods include isolation, power-off, and heat exchange. The temperature change ranges corresponding to the three processing methods of heat exchange, power-off, and isolation are such that their minimum values change to lower ones. The processing method corresponding to the temperature change range that is included in the heat exchange range but not in the power-off and isolation ranges is to perform heat exchange on the battery pack. The processing method corresponding to the temperature change range that is included in the heat exchange and power-off ranges but not in the isolation range is to cut off the power while performing heat exchange on the battery pack. The processing method corresponding to the temperature change range that is included in the heat exchange, power-off, and isolation ranges is to isolate the battery pack when cutting off the power while performing heat exchange on the battery pack, and a temperature control module; including a safety prevention module for executing the temperature control command and processing the battery pack according to the processing method corresponding to the temperature change range including the maximum cell temperature change. A safety processing device for a battery pack, characterized in that.

2. The safety prevention module includes isolation means for pushing the battery pack out by a predetermined distance, or the safety prevention module includes switch means for cutting off the electrical connection of the battery pack, or the safety prevention module includes heat exchange means for performing heat exchange on the battery pack. The safety processing device for a battery pack according to claim 1, characterized in that.

3. The isolation means includes any one of an elastic member, a push rod member, and an airbag member. The safety processing device for a battery pack according to claim 2, characterized in that.

4. An electrical energy storage device includes a temperature control module, a safety prevention module, and one or more battery boxes. In the battery box, a battery pack and a temperature detection module are provided. The battery pack includes one or more cells. The temperature detection module is for collecting the cell temperature changes of each cell in the battery pack. The temperature control module determines whether the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges. When it is determined that it is included, a temperature control command is generated according to the temperature change range including the maximum cell temperature change. Among them, different temperature change ranges correspond to different processing methods for the battery pack. The processing methods include isolation, power-off, and heat exchange. The temperature change ranges corresponding to the three processing methods of heat exchange, power-off, and isolation are such that their minimum values change to lower ones. The processing method corresponding to the temperature change range that is included in the heat exchange range but not in the power-off and isolation ranges is to perform heat exchange on the battery pack. The processing method corresponding to the temperature change range that is included in the heat exchange and power-off ranges but not in the isolation range is to cut off the power while performing heat exchange on the battery pack. The processing method corresponding to the temperature change range that is included in the heat exchange, power-off, and isolation ranges is to isolate the battery pack when cutting off the power while performing heat exchange on the battery pack. The safety prevention module executes the temperature control command and processes the battery pack according to the processing method corresponding to the temperature change range including the maximum cell temperature change. An electrical energy storage device characterized by this.

5. Specifically, the temperature detection module is for collecting local cell temperature changes at a plurality of local positions in each cell in the battery pack. Specifically, the temperature control module is for determining whether the maximum local cell temperature change in the battery pack is included in one of a plurality of temperature change ranges. When it is determined that it is included, it is specified that the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges. The electrical energy storage device according to claim 4, characterized by this.

6. The battery box includes a door. The safety prevention module includes a trigger mechanism installed inside the battery box. The trigger mechanism is installed opposite to the door. The battery pack is installed between the door and the trigger mechanism. Specifically, the temperature control module determines whether the maximum cell temperature change in the battery pack is included in the first temperature change range. When it is determined that it is included, it is for generating a first temperature control command. The first battery box provided with the first battery pack including cells whose maximum cell temperature change is included in the first temperature change range has a door that opens according to the first temperature control command, The trigger mechanism in the first battery box pushes out the first battery pack from the first battery box according to the first temperature control command. The electrical energy storage device according to claim 4 or 5, characterized in that.

7. The trigger mechanism includes any one of an elastic member, a push rod member, and an airbag member, The elastic member is for being ejected according to the first temperature control command to push out the first battery pack from the first battery box, The push rod member is for being pushed according to the first temperature control command to push out the first battery pack from the first battery box, The airbag member is filled with gas according to the first temperature control command to push out the first battery pack from the first battery box. The electrical energy storage device according to claim 6, characterized in that.

8. The battery box is provided with one or more rolling bearings at the bottom, and the battery pack is provided on the one or more rolling bearings. The electrical energy storage device according to claim 6 or 7, characterized in that.

9. When the minimum value of the first temperature change range is taken as the first threshold value, the value range of the first threshold value is set to 20 to 22 °C. The electrical energy storage device according to any one of claims 6 to 8, characterized in that.

10. The safety prevention module includes one or more power conversion systems, Each battery pack is electrically connected to the power conversion system, Each power conversion system is at least electrically connected to the battery pack, The safety prevention module includes one or more air exchange devices for realizing heat exchange between the electrical energy storage device and the external air. The electrical energy storage device according to claim 4, characterized in that.

11. The processing method includes a power cut, and the temperature control module is specifically for determining whether the maximum cell temperature change in the battery pack is included in the second temperature change range, When it is determined that it is included, a second temperature control command is generated, and the second temperature control command includes cutting off the electrical connection of the second battery pack including cells whose maximum cell temperature change is included in the second temperature change range. The power conversion system electrically connected to the second battery pack is for executing the second temperature control command, or Specifically, the temperature control module is for determining whether the maximum cell temperature change in the battery pack is included in a third temperature change range. When it is determined that it is included, a third temperature control command is generated. The air exchange device starts according to the third temperature control command. The electrical energy storage device according to claim 10, characterized in that.

12. When the minimum value of the second temperature change range is set as a second threshold value, the value range of the second threshold value is 10 to 12 °C. When the minimum value of the third temperature change range is set as a third threshold value, the value range of the third threshold value is 5 to 7 °C. The electrical energy storage device according to claim 11, characterized in that.

13. The battery box is provided above the power conversion system, and a heat insulation layer is provided between the battery box and the power conversion system. The electrical energy storage device according to any one of claims 10 to 12, characterized in that.

14. The electrical energy storage device further includes a temperature field detection module for detecting the temperature field in the electrical energy storage device. The temperature control module is further for determining whether the maximum temperature difference in the temperature field is greater than a fourth threshold value. When it is determined that it is greater, a fourth temperature control command is generated. The air exchange device starts according to the fourth temperature control command. The electrical energy storage device according to any one of claims 10 to 13, characterized in that.

15. The value range of the fourth threshold value is 5 to 7 °C. The electrical energy storage device according to claim 14, characterized in that.

16. Each of the one or more air exchange devices is provided at a position close to the tip of the electrical energy storage device and the power conversion system. The electrical energy storage device according to any one of claims 10 to 15, characterized in that.

17. A control method for an electrical energy storage device, comprising: The electrical energy storage device includes one or more battery boxes, and a battery pack including one or more cells is provided in the battery box. The control method includes: Collecting the cell temperature change of each cell in the battery pack. Determine whether the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges, wherein different temperature change ranges correspond to different processing methods for the battery pack, and the processing methods include isolation, power-off, and heat exchange. The temperature change ranges corresponding to the three processing methods of heat exchange, power-off, and isolation are such that their minimum values change to lower ones. The processing method corresponding to the temperature change range that is included in the heat exchange range but not in the power-off and isolation ranges is to perform heat exchange on the battery pack. The processing method corresponding to the temperature change range that is included in the heat exchange and power-off ranges but not in the isolation range is to turn off the power while performing heat exchange on the battery pack. The processing method corresponding to the temperature change range that is included in the heat exchange, power-off, and isolation ranges is to isolate the battery pack when turning off the power while performing heat exchange on the battery pack, and, When the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges, it includes processing the battery pack according to the processing method corresponding to the temperature change range including the maximum cell temperature change. A control method for an electrical energy storage device, characterized in that.

18. The step of collecting the cell temperature change of each cell in the battery pack is, Including collecting the local cell temperature changes at a plurality of local positions of each cell in the battery pack, The step of determining whether the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges is, Determining whether the maximum local cell temperature change in the battery pack is included in one of a plurality of temperature change ranges, and, When the maximum local cell temperature change in the battery pack is included in one of a plurality of temperature change ranges, it includes specifying that the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges. A control method for an electrical energy storage device according to claim 17, characterized in that.

19. The battery box includes a door, the battery box further includes a trigger mechanism, the trigger mechanism is installed opposite to the door, the battery pack is provided between the door and the trigger mechanism, and the step of determining whether the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges is, Determining whether the maximum cell temperature change in the battery pack is included in the first temperature change range, and, When the maximum cell temperature change in the battery pack is included in the first temperature change range, the door of the first battery box provided with the first battery pack including the cells in the first temperature change range including the maximum cell temperature change opens, and the trigger mechanism includes pushing out the first battery pack from the first battery box, or The electrical energy storage device further includes one or more power conversion systems, each battery pack is electrically connected to a power conversion system, and each power conversion system is at least electrically connected to the battery pack. The step of determining whether the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges is determining whether the maximum cell temperature change in the battery pack is included in the second temperature change range, and when it is determined that it is included, cutting off the electrical connection of the second battery pack by a power conversion system electrically connected to the second battery pack including the cells in the second temperature change range including the maximum cell temperature change, or The electrical energy storage device further includes one or more air exchange devices for realizing heat exchange between the electrical energy storage device and the external air. The step of determining whether the maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges is determining whether the maximum cell temperature change in the battery pack is included in the third temperature change range, and when it is determined that it is included, starting the air exchange device, The control method of the electrical energy storage device according to claim 17 or 18, characterized by including the above.

20. When the minimum value of the first temperature change range is set as the first threshold value, the value range of the first threshold value is set to 20 to 22 °C, When the minimum value of the second temperature change range is set as the second threshold value, the value range of the second threshold value is set to 10 to 12 °C, When the minimum value of the third temperature change range is set as the third threshold value, the value range of the third threshold value is set to 5 to 7 °C. The control method of the electrical energy storage device according to claim 19, characterized by the above.

21. The electrical energy storage device further includes one or more air exchange devices for realizing heat exchange between the electrical energy storage device and the external air, The control method is detecting the temperature field in the electrical energy storage device, determining whether the maximum temperature difference in the temperature field is greater than a fourth threshold value, When it is determined that the value is large, further including that the air exchange device is activated, the method for controlling an electrical energy storage device according to any one of claims 17 to 20, characterized in that.

22. The method for controlling an electrical energy storage device according to claim 21, characterized in that the value range of the fourth threshold value is set to 5 to 7 °C.

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