Battery pack safety processing device, electric 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 priority from Chinese patent application No. 201910566870.8, filed on June 27, 2019. This application incorporates the full text of the above Chinese patent application.

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

[0003] Electrical energy storage devices are systems capable of storing and providing electrical energy, and have functions such as smooth transition, peak cutting, modulation, and voltage adjustment. With the development of new materials for lithium-ion batteries, innovation in battery manufacturing technology, and the entry of numerous scientific research institutions and companies, the performance of lithium-ion batteries is constantly improving, battery costs are steadily decreasing, and battery safety is also significantly improving. Lithium-ion batteries are gradually becoming more advantageous in the field of energy storage.

[0004] However, lithium batteries have the disadvantages of low voltage and small capacity per cell, and an industrially applicable energy storage system requires over a thousand cells. At the same time, lithium batteries perform poorly at low temperatures and are highly susceptible to dangerous conditions such as explosion and combustion when subjected to abuse, such as overcharging, short circuiting, pressing, puncturing, vibration, high temperature, or thermal shock.

[0005] In the prior art, when a battery management system collects and processes the temperature, voltage, and current of a battery, and uses a passive fire prevention device for monitoring and prevention, if there is a problem of thermal inability to control, a single battery module that cannot be thermally controlled cannot be effectively handled, which may cause serious losses that cannot be recovered from the energy storage system. Summary of the Invention [Problem to be solved by the invention]

[0006] 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, in order to overcome the drawbacks of adopting a passive safety measure in an electric energy storage device in the prior art. [Means for solving the problem]

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

[0008] The battery pack safety treatment device is a temperature measurement module for collecting temperature changes of each cell in the battery pack; a temperature control module for determining whether a maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges, and if it is determined that the maximum cell temperature change is 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 modes of the battery pack, and the temperature control command processes the battery pack according to the processing mode corresponding to the included temperature change range; The temperature control system further includes a safety prevention module for executing the temperature control instructions.

[0009] Preferably, the treatment method includes isolation, and the safety prevention module includes isolation means for pushing the battery pack 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 powering down, and the safety prevention module includes a switch means for disconnecting the battery pack from electrical connection.

[0012] Preferably, the treatment method includes temperature reduction, and the safety prevention module includes temperature reduction means for reducing the temperature of the battery pack.

[0013] The electrical energy storage device The electrical energy storage device includes a temperature control module, a safety prevention module, and one or more battery boxes, and the battery boxes are 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 cell temperature changes of each cell in the battery pack; the temperature control module determines whether a maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges, and if it is determined that the maximum cell temperature change is included, generates a temperature control command according to a temperature change range including the maximum cell temperature change, wherein different temperature change ranges correspond to different battery pack processing methods, and the temperature control command includes a command for processing the battery pack according to a processing method corresponding to the included temperature change range; The safety prevention module is for executing the temperature control command.

[0014] Preferably, the temperature detection module is specifically for collecting local cell temperature changes at multiple local positions of each cell in the battery pack; The temperature control module is specifically configured to determine whether a maximum local cell temperature change in the battery pack is within one of a plurality of temperature change ranges; If it is determined that the maximum cell temperature change in the battery pack is within one of a plurality of temperature change ranges, the maximum cell temperature change in the battery pack is determined to be within one of a plurality of temperature change ranges.

[0015] Preferably, the treatment 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 disposed opposite to the door, and the battery pack is disposed between the door and the trigger mechanism; The temperature control module is specifically configured to determine whether a maximum cell temperature change in the battery pack is within a first temperature change range, and generate a first temperature control command if it is determined that the maximum cell temperature change is within a first temperature change range; a first battery box having a first battery pack including cells whose maximum cell temperature change is within the first temperature change range, the door of which opens in accordance with the first temperature control command; A trigger mechanism in the first battery box pushes the first battery pack out of 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 of the first battery box is pushed out in accordance with the first temperature control command to push the first battery pack out of the first battery box; a push rod member on the first battery box is pushed according to the first temperature control command to push the first battery pack out of the first battery box; The airbag member in the first battery box is filled with gas according to the first temperature control command to push the first battery pack out of the first battery box.

[0017] Preferably, the battery box has one or more rolling bearings at its bottom, and the battery pack is mounted 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 value, the range of the first threshold value is set to 20 to 22°C.

[0019] Preferably, the safety prevention module 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.

[0020] Preferably, the processing manner includes power-off, and the temperature control module specifically determines whether a maximum cell temperature change in the battery pack is within a second temperature change range; generating a second temperature control command when it is determined that the second temperature change range includes a maximum cell temperature change, the second temperature control command including disconnecting an electrical connection to a second battery pack including a cell in the second temperature change range including the maximum cell temperature change; A power conversion system electrically connected to the second battery pack is for implementing the second temperature control command.

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

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

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

[0024] Preferably, the processing method includes a temperature drop, and the temperature control module is specifically for determining whether a maximum cell temperature change in the battery pack is within a third temperature change range; generating a third temperature control command if it is determined that the third temperature control command is included; 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 a third threshold value, the range of the third threshold value is 5 to 7°C.

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

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

[0028] Preferably, the one or more air exchange devices are provided at positions adjacent to the leading end of the electrical energy storage device and the power conversion system, respectively.

[0029] A control method for an electric energy storage device includes: the electric energy storage device includes one or more battery boxes; a battery pack is provided in the battery box; the battery pack includes one or more cells; and the control method includes: collecting cell temperature changes of each cell in the battery pack; determining whether the maximum cell temperature change in the battery pack is within one of a plurality of temperature change ranges, wherein different temperature change ranges correspond to different battery pack processing modes; If it is determined that the maximum cell temperature change is included, the battery pack is treated in accordance with a treatment method corresponding to the temperature change range including the maximum cell temperature change.

[0030] Preferably, the step of collecting the cell temperature change of each cell in the battery pack comprises: collecting local cell temperature variations at a plurality of local locations of each cell in the battery pack; The step of determining whether the maximum cell temperature change in the battery pack is within one of a plurality of temperature change ranges includes: determining whether a maximum local cell temperature change in the battery pack falls within one of a plurality of temperature change ranges; and If it is determined that the maximum cell temperature change in the battery pack is within one of a plurality of temperature change ranges, the method includes identifying the maximum cell temperature change in the battery pack as being within one of a plurality of temperature change ranges.

[0031] Preferably, the processing method includes isolation, the battery box includes a door, and the battery box further includes a trigger mechanism, the trigger mechanism is installed opposite to the door, and the battery pack is installed between the door and the trigger mechanism, and the step of determining whether a maximum cell temperature change in the battery pack is within one of a plurality of temperature change ranges includes: determining whether a maximum cell temperature change in the battery pack is within a first temperature change range; When it is determined that the cell temperature is within the first temperature change range, the door of a first battery box having a first battery pack including cells in the first temperature change range that includes the maximum cell temperature change is opened, and the trigger mechanism pushes 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 range of the first threshold value is set to 20 to 22°C.

[0033] Preferably, the processing method includes power loss, 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 electrically connected to at least one battery pack, and the step of determining whether a maximum cell temperature change in the battery pack is within one of a plurality of temperature change ranges includes: determining whether a maximum cell temperature change in the battery pack is within a second temperature change range; If it is determined that the cells are included, a power conversion system electrically connected to a second battery pack including cells in the second temperature change range that includes the maximum cell temperature change includes electrically disconnecting the second battery pack.

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

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

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

[0037] Preferably, the electric energy storage device further includes one or more air exchange devices for realizing heat exchange between the electric energy storage device and external air, and the control method includes: Sensing a temperature field within the electrical energy storage device; determining whether a maximum temperature differential in the temperature field is greater than a fourth threshold; and If it is determined that the air temperature is large, the air exchange device is activated.

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

[0039] The positive advances and advantages of the present invention are that the present invention detects the maximum cell temperature change in a battery pack and processes the battery pack according to a processing method corresponding to the temperature change range including the maximum cell temperature change in the battery pack, thereby proactively and effectively preventing the battery pack from becoming uncontrollable in heat and avoiding irreparable losses. [Brief explanation of the drawings]

[0040] [Figure 1] 1 is a schematic diagram of a module of a safety processing device for a battery pack according to a first embodiment of the present invention; [Figure 2] 3 is a schematic diagram showing the relationship between the treatment method of the battery pack and the temperature change range in the battery pack safety treatment device according to the first embodiment of the present invention; FIG. [Figure 3] FIG. 2 is a module schematic diagram of an electrical energy storage device according to a second embodiment of the present invention. [Figure 4] FIG. 4 is a circuit connection diagram of a power conversion system and a battery pack in an electric energy storage device according to a second embodiment of the present invention. [Figure 5] FIG. 4 is a schematic diagram illustrating the configuration of a portion of a battery storage section in an electric energy storage device according to a second embodiment of the present invention. [Figure 6] FIG. 2 is a schematic diagram of the configuration of an electrical energy storage device according to a second embodiment of the present invention. [Figure 7] 10 is a flowchart of a control method for an electric energy storage device according to a third embodiment of the present invention. [Figure 8] 10 is a detailed flowchart of a method for controlling an electric energy storage device according to a third embodiment of the present invention. [Figure 9] 10 is a flowchart of step S102 in a control method for an electric energy storage device according to a third embodiment of the present invention. DETAILED DESCRIPTION OF THE INVENTION

[0041] The present invention will be described in detail below based on examples, but the present invention is not limited to the scope of the examples. First Example

[0042] This embodiment provides a safety treatment device for a battery pack, and Figure 1 is a schematic diagram of the modules illustrating this embodiment. Referring to Figure 1, the safety treatment device of 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 used to collect cell temperature changes of each cell in the battery pack, and the temperature detection module 11 may employ a temperature sensor such as an optical fiber temperature sensor. The cell temperature changes may include, but are not limited to, cell temperature rises and temperature differences.

[0043] The temperature control module 12 determines whether the maximum cell temperature change among all cell temperature changes in the battery pack collected by the temperature detection module 11 falls within one of a plurality of temperature change ranges. Each temperature change range may be customized according to the actual application scenario. Different temperature change ranges correspond to different battery pack processing methods. If the temperature control module 12 determines that the maximum cell temperature change is included, it generates a temperature control command according to the temperature change range that includes the maximum cell temperature change, and the temperature control command processes the battery pack according to the processing method corresponding to the included temperature change range.

[0044] The safety prevention module 13 executes the temperature control command generated by the temperature control module 12 and processes the battery pack according to a processing method corresponding to the temperature change range including the maximum cell temperature change, thereby providing safety prevention to the battery pack.

[0045] In this embodiment, the battery pack treatment methods include, but are not limited to, temperature drop, power cut, and isolation. Among these, temperature drop, power cut, and isolation play increasingly important roles in battery pack safety prevention. Therefore, the temperature change ranges corresponding to the three treatment methods, temperature drop, power cut, and isolation, change from lowest to highest. Specifically, FIG. 2 shows the relationship between the three treatment methods and the temperature change ranges. Because cell temperature changes inevitably change from small to large as the battery pack is used, there are three combination treatment methods for each of the predetermined temperature change ranges: a treatment method for dropping the battery pack temperature (a temperature change range corresponding to a temperature drop but not a power cut), a treatment method for turning off the power while dropping the battery pack temperature (a temperature change range corresponding to a power cut but not an isolation), and a treatment method for isolating the battery pack while dropping the battery pack temperature and powering it off (a temperature change range corresponding to an isolation).

[0046] Specifically, the safety prevention module 13 includes a temperature reduction means 131. When the processing method corresponding to the temperature change range including the maximum cell temperature change is temperature reduction, the temperature reduction means 131 is used to reduce the temperature of the battery pack, thereby performing safety prevention from the outside of the battery pack and preventing the temperature of the battery pack from rising further.

[0047] The safety prevention module 13 further includes a switch means 132. When the processing method corresponding to the temperature change range including the maximum cell temperature change is power off, the switch means 132 is used to cut off the electrical connection of the battery pack to prevent the battery pack from continuously dissipating heat during discharging, which may cause a thermal hazard. Alternatively, 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, the current maximum cell temperature is also included in the temperature change range for the temperature drop processing method, so even if the temperature drop processing method is used, it is not possible to prevent the cell temperature change from further increasing, and it is therefore necessary to power off the battery pack while allowing the temperature to drop.

[0048] The safety prevention module 13 further includes an isolating means 133. When the isolation mode is selected for the temperature change range including the maximum cell temperature change, the isolating means 133 pushes the battery pack a predetermined distance. The predetermined distance may be set according to the actual location of the battery pack. This prevents the battery pack from using power in the surrounding electrical modules in the event of a fire at the battery pack's original location, which could affect safety. In this embodiment, the isolating means 133 includes, but is not limited to, an elastic member, a push rod member, and an airbag member.

[0049] In this embodiment, the maximum cell temperature change in the battery pack is detected, and the battery pack is treated according to a treatment method corresponding to the temperature change range including the maximum cell temperature change in the battery pack, thereby proactively and effectively preventing the battery pack from becoming uncontrollable in heat and avoiding irredeemable losses.

[0050] Second Example This embodiment provides an electric energy storage device, and Fig. 3 is a schematic diagram of a module illustrating this embodiment. Referring to Fig. 3, the electric 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] 3, in this embodiment, a battery box 23 is provided with a battery pack 231 including one or more cells, and a temperature detection module 232 for collecting cell temperature changes of each cell in the battery pack 231. 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, a temperature rise or temperature difference of the cell.

[0052] The temperature control module 21 determines whether the maximum cell temperature change among all cell temperature changes in the battery pack 231 collected by the temperature detection module 232 falls within one of a plurality of temperature change ranges, where different temperature change ranges may correspond to different battery pack processing methods. If the temperature control module 21 determines that the maximum cell temperature change falls within the range, it generates a temperature control command according to the temperature change range that includes the maximum cell temperature change, and the temperature control command includes a command to process the battery pack 231 according to the processing method corresponding to the included temperature change range.

[0053] The safety prevention module 22 is intended to perform the role of preventing the safety of the battery pack by executing the temperature control command generated by the temperature control module 21 and processing the battery pack 231 according to a processing method corresponding to a temperature change range including the maximum cell temperature change.

[0054] In this embodiment, the temperature detection module 232 specifically collects local cell temperature changes at multiple (e.g., five or more) local positions of each cell in the battery pack 231, and the temperature control module 21 specifically determines whether the maximum local cell temperature change in all local cell temperature changes in the battery pack 231 falls within one of multiple temperature change ranges, and if so, determines that the maximum cell temperature change in the battery pack 231 falls within one of the multiple temperature change ranges. Therefore, this embodiment is more sensitive to cell temperature changes and can provide more accurate feedback of cell temperature changes.

[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 modes of temperature drop, power off, and isolation, respectively. It should be understood that the three temperature change ranges and three battery pack processing modes in this embodiment are merely for the purpose of explaining this embodiment and are not intended to be limiting. Furthermore, in this embodiment, the temperature drop, power off, and isolation play increasingly important roles in battery pack safety protection and involve a process in which cell temperature changes inevitably change from small to large as the battery pack is used. Therefore, the predetermined third temperature change range, the second temperature change range, and the first temperature change range correspond to three combined processing modes, respectively, namely, a processing mode in which the battery pack is cooled, a processing mode in which the battery pack is powered off while cooling, and a processing mode in which the battery pack is isolated while cooling and powering off.

[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, thereby performing safety prevention from the outside of the battery pack 231 and preventing the temperature of the battery pack 231 from rising further.

[0057] Specifically, in this embodiment, the temperature control module 21 determines whether the maximum cell temperature change in the battery pack 231 is within a third temperature change range, and if the minimum value of the third temperature change range is set as a third threshold, the range of the third threshold may be 5 to 7° C. If the temperature control module 21 determines that the maximum cell temperature change is within the third temperature change range, it generates a third temperature control command, and the air exchange device 221 is activated in accordance with the third temperature control command to exchange heat between the electric energy storage device and the external air, thereby lowering 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 systems 222 and the battery packs 231. Each battery pack 231 is electrically connected to the power conversion system 222, and each power conversion system 222 is electrically connected to at least one battery pack 231, so that the power conversion system 222 can independently control the multiple battery packs 231.

[0059] Specifically, to prevent further cell temperature changes while simultaneously lowering the temperature of the battery pack 231, the temperature control module 21 may further determine whether the maximum cell temperature change in the battery pack 231 falls within a second temperature change range. The second threshold value may be set to the minimum value of the second temperature change range, with the second threshold value ranging from 10°C to 12°C. If the temperature control module 21 determines that the maximum cell temperature change falls within the second temperature change range, it generates a second temperature control command to disconnect the second battery pack, which includes cells in the second temperature change range that includes 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 second battery pack, thereby preventing thermal hazards caused by the second battery pack continuously radiating heat during discharging. It should be understood that, because the temperature drop process cannot prevent further cell temperature changes, the battery pack may be powered off while the temperature is being lowered.

[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 on the battery box 23, the trigger mechanism 223 is installed opposite the door 233, and the battery pack 231 is provided between the door 233 and the trigger mechanism 223.

[0061] Specifically, to prevent further cell temperature changes when the power conversion system 222 is electrically disconnected while the battery pack 231 is being cooled, the temperature control module 21 further determines whether the maximum cell temperature change in the battery pack 231 is within a first temperature change range, where a minimum value of the first temperature change range is a first threshold value, and the range of the first threshold value may be 20 to 22°C. If the temperature determination module 21 determines that the maximum cell temperature change is within the first temperature change range, the temperature determination module 21 generates a first temperature control command, so that the door of the first battery box, which includes the first battery pack including cells within the first temperature change range that includes the maximum cell temperature change, opens in accordance with the first temperature control command, and the trigger mechanism 223 in the first battery box pushes the first battery pack out of the first battery box in accordance with the first temperature control command, thereby achieving physical isolation between the first battery pack and the first battery box. This prevents the first battery pack from affecting the use of power 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] In this embodiment, the trigger mechanism 223 may include any one of an elastic member, a push rod member, and an airbag member, where the elastic member is ejected in accordance with the first temperature control command to push the first battery pack out of the first battery box, the push rod member is pressed in accordance with the first temperature control command to push the first battery pack out of the first battery box, and the airbag member is filled with gas in accordance with the first temperature control command to push the first battery pack out of the first battery box. In this embodiment, the battery box 23 further has one or more rolling bearings at its bottom, and the battery pack 231 is mounted on the one or more rolling bearings, so that when the trigger mechanism 223 is triggered in accordance with the first temperature control command, the first battery pack can be easily pushed out of the first battery box, thereby further improving the safety of the electrical energy storage device.

[0063] Referring to FIG. 3 , in this embodiment, the electric energy storage device further includes a temperature field detection module 24 for detecting a temperature field within the electric energy storage device. The temperature control module 21 further determines whether the maximum temperature difference in the temperature field is greater than a fourth threshold. The fourth threshold may be customized according to actual applications. In this embodiment, the fourth threshold may range from 5°C to 7°C. If the temperature control module 21 determines that the fourth threshold is included, it generates a fourth temperature control command. The air exchange device 221 is activated according to the fourth temperature control command, thereby performing heat exchange between the electric energy storage device and the external air and lowering the temperature of the battery pack 231. In this embodiment, the air exchange device 221 may be activated according to a third temperature control command generated by detecting changes in cell temperature in the battery pack 231, or according to a fourth command generated by detecting a temperature field in which the electric energy storage device is located.

[0064] In this embodiment, the battery pack 231 is housed in a battery housing section, and Fig. 5 is a schematic diagram showing the configuration of the battery housing section in this embodiment. Referring to Fig. 5, the battery housing section includes the battery pack 231, a trigger mechanism 223, and a power conversion system cabinet, of which the battery pack 231 may be provided on top of the power conversion system cabinet or 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 top of the power conversion system 222. Also, in this embodiment, a heat insulating 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 an electric energy storage device according to this embodiment. Referring to FIG. 6, the electric energy storage device may be configured as a box. The electric energy storage device may include a battery compartment and one or more air exchange devices 221. In this embodiment, a power conversion system (not shown) is provided below the battery compartment, and air exchange devices 221 are provided at the tip of the electric energy storage device and in positions adjacent to the power conversion system. This allows a heat exchange passage to be formed in the remaining space in the electric energy storage device, enabling circulatory air exchange. This reduces energy consumption compared to conventional methods of adjusting and controlling temperature using air conditioning.

[0066] In this embodiment, the maximum cell temperature change in the battery pack is detected, and the battery pack is treated according to a treatment method corresponding to the temperature change range including the maximum cell temperature change in the battery pack, thereby proactively and effectively preventing the battery pack from becoming uncontrollable in heat and avoiding irredeemable losses.

[0067] Third embodiment This embodiment provides a control method for an electric energy storage device, wherein the electric energy storage device includes one or more battery boxes, the battery boxes are provided with a battery pack, and the battery pack includes one or more cells. Figure 7 is a flowchart of this embodiment. Referring to Figure 7, the control method according to this embodiment includes the following steps: S101: collecting cell temperature changes of each cell in the battery pack; determining whether a maximum cell temperature change in the battery pack is within one of a plurality of temperature change ranges; If it is determined that the temperature change range includes the maximum cell temperature change, the battery pack is processed according to a processing method corresponding to the temperature change range (S103).

[0068] In this embodiment, the cell temperature change includes, but is not limited to, a cell temperature rise and a temperature difference. Referring to FIG. 8 , step S101 may include S101A, collecting local cell temperature changes at multiple local locations for each cell in the battery pack. At least five local cell temperature changes may be collected for each cell. Step S102 may further include S102A, determining whether a maximum local cell temperature change in the battery pack falls within one of a plurality of temperature change ranges. If determined to fall within one of the plurality of temperature change ranges, proceed to S102B, identifying the maximum cell temperature change in the battery pack as falling within one of the plurality of temperature change ranges.

[0069] Therefore, this embodiment is more sensitive to changes in the cell temperature, and can more accurately feed back changes in the cell temperature.

[0070] 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 modes of temperature drop, power off, and isolation, respectively. It should be understood that the three temperature change ranges and three battery pack processing modes in this embodiment are merely for the purpose of explaining this embodiment and are not intended to be limiting. Furthermore, in this embodiment, the temperature drop, power off, and isolation play increasingly important roles in battery pack safety protection and involve a process in which cell temperature changes inevitably change from small to large as the battery pack is used. Therefore, the predetermined third temperature change range, the second temperature change range, and the first temperature change range correspond to three combined processing modes, respectively, namely, a processing mode in which the battery pack is cooled, a processing mode in which the battery pack is powered off while cooling, and a processing mode in which the battery pack is isolated while cooling and powering off.

[0071] In this embodiment, the electric energy storage device further includes one or more air exchange devices for realizing heat exchange between the electric energy storage device and the external air, thereby providing safety precautions from the outside of the battery pack and preventing the battery pack from overheating. In this embodiment, the electric energy storage device may further include one or more power conversion systems. Each battery pack is electrically connected to a power conversion system, and each power conversion system is electrically connected to at least one battery pack, so that the power conversion systems can independently control the multiple battery packs. In this embodiment, the battery box may include a door. The battery box may further include a trigger mechanism, the trigger mechanism being installed opposite the door, and the battery pack being installed between the door and the trigger mechanism.

[0072] From the above, referring to FIG. 9, step S102 specifically includes S1021, S1022, S1023, S1024, S1025 and S1026. In step S1021, it is determined whether the maximum cell temperature change in the battery pack is within the third temperature change range. If it is determined that it is within the third temperature change range, the process proceeds to step S1022, and if not, the process returns to step S1021. In S1022, the air exchange device is started. In step S1023, it is determined whether the maximum cell temperature change in the battery pack is within the second temperature change range. If it is determined that it is within the second temperature change range, the process proceeds to step S1024, and if not, the process returns to step S1021. S1024: The power conversion system electrically connected to a second battery pack including cells in a second temperature change range including the maximum cell temperature change electrically disconnects the second battery pack. In step S1025, it is determined whether the maximum cell temperature change in the battery pack is within the first temperature change range. If it is determined that it is within the first temperature change range, the process proceeds to step S1026, and if not, the process returns to step S1023. In S1026, the door of the first battery box having the first battery pack including cells in a first temperature change range including the maximum cell temperature change is opened, and the trigger mechanism pushes the first battery pack out of the first battery box.

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

[0074] When the temperature of the battery pack is decreased in step S1022, the maximum cell temperature change may decrease and then increase again as the battery pack discharges, and may fall within the second temperature change range, causing the battery pack to be electrically disconnected in step S1024. Furthermore, the temperature decrease process cannot prevent further cell temperature change. To prevent thermal hazards caused by the battery pack continuously radiating heat during the discharge process and to avoid further cell temperature change, it is also possible to turn off the power while decreasing the battery pack's temperature.

[0075] If the maximum cell temperature change is still increased and falls within the first temperature change range after step S1024, it is necessary to take further safety precautions to prevent spontaneous combustion of the powered-off battery pack. In this case, step S1026 is carried out to physically isolate the battery pack from the battery box, thereby preventing spontaneous combustion of the battery pack in the battery box from affecting the safety of power usage for other electrical modules in the electrical energy storage device located around the battery box.

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

[0077] The range of the fourth threshold value may be 5 to 7°C.

[0078] In this embodiment, the maximum cell temperature change in the battery pack is detected, and the battery pack is treated according to a treatment method corresponding to the temperature change range including the maximum cell temperature change in the battery pack, thereby proactively and effectively preventing the battery pack from becoming uncontrollable in heat and avoiding irredeemable losses.

[0079] Although specific embodiments of the present invention have been described above, those skilled in the art will understand that these are merely illustrative examples, and that the scope of protection provided by the present invention is limited by the scope of the claims. Those skilled in the art may make various changes and modifications to these embodiments without departing from the principles and spirit of the present invention, and all such changes and modifications are within the scope of protection provided by the present invention.

Claims

1. A safety treatment device for a battery pack, a temperature measurement module for collecting temperature changes of each cell in the battery pack; determining whether a maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges, and if it is determined that the maximum cell temperature change is 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 battery pack processing methods; The processing modes include isolation, power-off, and heat exchange, and the minimum values ​​of the temperature change ranges corresponding to the three processing modes of heat exchange, power-off, and isolation change to lower values. A processing mode corresponding to a temperature change range included in the range of heat exchange but not included in power-off and isolation causes the battery pack to exchange heat; a processing mode corresponding to a temperature change range included in the range of heat exchange and power-off but not included in isolation causes the battery pack to exchange heat while powering off; and a processing mode corresponding to a temperature change range included in the range of heat exchange, power-off, and isolation causes the battery pack to exchange heat while powering off while isolating the battery pack; a safety prevention module for executing the temperature control command and processing the battery pack according to a processing method corresponding to a temperature change range including a maximum cell temperature change.

2. the safety module includes isolation means for pushing the battery pack a predetermined distance; or the safety prevention module includes a switch means for disconnecting the electrical connection of the battery pack; or 2. The battery pack safety treatment device according to claim 1, wherein the safety prevention module includes a heat exchange means for exchanging heat with the battery pack.

3. The safety treatment device for a battery pack according to claim 2 , wherein the isolating means includes any one of an elastic member, a push rod member, and an airbag member.

4. The electrical energy storage device includes a temperature control module, a safety prevention module, and one or more battery boxes, and the battery boxes are 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 cell temperature changes of each cell in the battery pack; the temperature control module determines whether a maximum cell temperature change in the battery pack is within one of a plurality of temperature change ranges, and if so, generates a temperature control command according to a temperature change range including the maximum cell temperature change, wherein different temperature change ranges correspond to different battery pack processing modes, the processing modes including isolation, power-off, and heat exchange, and the temperature change ranges corresponding to the three processing modes of heat exchange, power-off, and isolation have lower minimum values; a processing mode corresponding to a temperature change range included in the heat exchange range but not included in the power-off and isolation ranges causes the battery pack to exchange heat; a processing mode corresponding to a temperature change range included in the heat exchange and power-off ranges but not included in the isolation ranges causes the battery pack to exchange heat while powering off; and a processing mode corresponding to a temperature change range included in the heat exchange, power-off, and isolation ranges causes the battery pack to exchange heat while powering off. The safety prevention module executes the temperature control command to process the battery pack according to a processing method corresponding to a temperature change range including a maximum cell temperature change.

5. The temperature detection module is specifically for collecting local cell temperature changes at multiple local positions in each cell in the battery pack; The temperature control module is specifically configured to determine whether a maximum local cell temperature change in the battery pack is within one of a plurality of temperature change ranges; 5. The electrical energy storage device according to claim 4, wherein when it is determined that the temperature change is within one of a plurality of temperature change ranges, the maximum cell temperature change in the battery pack is determined to be within one of a plurality of temperature change ranges.

6. the battery box includes a door, the safety prevention module includes a trigger mechanism installed in the battery box, the trigger mechanism is installed facing the door, and the battery pack is installed between the door and the trigger mechanism; The temperature control module is specifically configured to determine whether a maximum cell temperature change in the battery pack is within a first temperature change range, and generate a first temperature control command if it is determined that the maximum cell temperature change is within a first temperature change range; a first battery box having a first battery pack including cells whose maximum cell temperature change is within the first temperature change range, the door of which opens in accordance with the first temperature control command; 6. The electrical energy storage device according to claim 4, wherein a trigger mechanism in the first battery box pushes the first battery pack out of the first battery box according to the first temperature control command.

7. the trigger mechanism includes one of an elastic member, a push rod member, and an airbag member; the elastic member is configured to be pushed out in accordance with the first temperature control command to push the first battery pack out of the first battery box; the push rod member is pushed according to the first temperature control command to push the first battery pack out of the first battery box; 7. The electric energy storage device according to claim 6, wherein the airbag member is filled with gas according to the first temperature control command to push the first battery pack out of the first battery box.

8. 8. The electric energy storage device according to claim 6, wherein the battery box has one or more rolling bearings at its bottom, and the battery pack is mounted on the one or more rolling bearings.

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

10. the safety prevention module 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; 5. The electric energy storage device according to claim 4, wherein the safety prevention module comprises one or more air exchange devices for realizing heat exchange between the electric energy storage device and the outside air.

11. The processing manner includes power-off, and the temperature control module specifically determines whether a maximum cell temperature change in the battery pack is within a second temperature change range; generating a second temperature control command when it is determined that the second temperature change range is included, the second temperature control command including disconnecting an electrical connection to a second battery pack including a cell whose maximum cell temperature change is included in the second temperature change range; a power conversion system electrically connected to the second battery pack for implementing the second temperature control command; or The temperature control module is specifically for determining whether a maximum cell temperature change in the battery pack is within a third temperature change range; generating a third temperature control command if it is determined that the third temperature control command is included; 11. The electrical energy storage device of claim 10, wherein the air exchange device is activated according to the third temperature control command.

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

13. The electric energy storage device according to any one of claims 10 to 12, characterized in that the battery box is provided on top of the power conversion system and a thermal insulating layer is provided between the battery box and the power conversion system.

14. The electric energy storage device further includes a temperature field detection module for detecting a temperature field within the electric energy storage device; The temperature control module is further configured to determine whether a maximum temperature difference in the temperature field is greater than a fourth threshold value; If it is determined that the temperature is greater than the predetermined value, a fourth temperature control command is generated.

14. The electric energy storage device according to claim 10, wherein the air exchange device is activated according to the fourth temperature control command.

15. 15. The electrical energy storage device of claim 14, wherein the fourth threshold value is in a range of 5 to 7 degrees Celsius.

16. The electrical energy storage device according to any one of claims 10 to 15, characterized in that the one or more air exchange devices are provided at positions adjacent to the tip of the electrical energy storage device and the power conversion system, respectively.

17. 1. A method for controlling an electrical energy storage device, comprising: The electrical energy storage device includes one or more battery boxes, and the battery boxes are provided with a battery pack including one or more cells; The control method includes: collecting cell temperature changes of each cell in the battery pack; determining whether the maximum cell temperature change in the battery pack is within one of a plurality of temperature change ranges, wherein different temperature change ranges correspond to different battery pack processing methods, the processing methods including isolation, power-off, and heat exchange; the temperature change ranges corresponding to the three processing methods of heat exchange, power-off, and isolation have lower minimum values; the processing method corresponding to the temperature change range within the heat exchange range but not within the power-off and isolation ranges causes the battery pack to exchange heat; the processing method corresponding to the temperature change range within the heat exchange and power-off ranges but not within the isolation ranges causes the battery pack to exchange heat while powering off; and the processing method corresponding to the temperature change ranges within the heat exchange, power-off, and isolation ranges causes the battery pack to exchange heat while powering off; and and, when a maximum cell temperature change in the battery pack is included in one of a plurality of temperature change ranges, processing the battery pack according to a processing method corresponding to a temperature change range including the maximum cell temperature change.

18. The step of collecting the cell temperature change of each cell in the battery pack includes: collecting local cell temperature variations at a plurality of local locations of each cell in the battery pack; The step of determining whether the maximum cell temperature change in the battery pack is within one of a plurality of temperature change ranges includes: determining whether a maximum local cell temperature change in the battery pack falls within one of a plurality of temperature change ranges; and 20. The method of claim 17, further comprising: determining that a maximum cell temperature change in the battery pack is within one of a plurality of temperature change ranges if the maximum local cell temperature change in the battery pack is within one of a plurality of temperature change ranges.

19. The battery box includes a door, the battery box further includes a trigger mechanism, the trigger mechanism is disposed opposite the door, and the battery pack is disposed between the door and the trigger mechanism, and the step of determining whether a maximum cell temperature change in the battery pack is within one of a plurality of temperature change ranges includes: determining whether a maximum cell temperature change in the battery pack is within a first temperature change range; and When a maximum cell temperature change in the battery pack is within a first temperature change range, a door of a first battery box having a first battery pack including cells in the first temperature change range that includes the maximum cell temperature change opens, and the trigger mechanism pushes the first battery pack out of 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 electrically connected to at least one battery pack, and the step of determining whether a maximum cell temperature change in the battery pack is within one of a plurality of temperature change ranges includes: determining whether a maximum cell temperature change in the battery pack is within a second temperature change range; and If the second battery pack includes cells in the second temperature change range that includes the maximum cell temperature change, disconnecting the second battery pack by a power conversion system electrically connected to the second battery pack, the second battery pack including cells in the second temperature change range that includes the maximum cell temperature change; or The electric energy storage device further includes one or more air exchange devices for realizing heat exchange between the electric energy storage device and external air, and the step of determining whether a maximum cell temperature change in the battery pack is within one of a plurality of temperature change ranges includes: determining whether a maximum cell temperature change in the battery pack is within a third temperature change range; and 19. The method for controlling an electric energy storage device according to claim 17 or 18, further comprising: activating the air exchange device when it is determined that the air exchange device is included.

20. When the minimum value of the first temperature change range is set as a first threshold value, the 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 a second threshold value, the range of the second threshold value is set to 10 to 12°C, The control method for an electric energy storage device according to claim 19, wherein the minimum value of the third temperature change range is a third threshold value, and the range of the third threshold value is 5 to 7°C.

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 external air; The control method includes: Sensing a temperature field within the electrical energy storage device; determining whether a maximum temperature differential in the temperature field is greater than a fourth threshold; The method for controlling an electric energy storage device according to any one of claims 17 to 20, further comprising: activating the air exchange device when it is determined that the air exchange rate is large.

22. 22. The method for controlling an electric energy storage device according to claim 21, wherein the fourth threshold value is in a range of 5 to 7 degrees Celsius.

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