Battery pack safety processing device, power 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. Among them, the safety processing device includes: a temperature monitoring module for collecting the temperature changes of the battery cells in the battery pack; a temperature control module for judging whether the maximum battery cell temperature change in the battery pack falls into one of a plurality of temperature change ranges, and if so, generating a temperature control instruction including a battery pack processing method according to the temperature change range in which the maximum battery cell temperature change falls. By monitoring the maximum battery cell temperature change in the battery pack and processing the battery pack according to the processing method corresponding to the temperature change range in which the maximum battery cell temperature change in the battery pack falls, it is possible to actively and effectively prevent thermal runaway of the battery pack and avoid irreparable losses.

Description

[0001] This application is a divisional application of the invention patent with application date of June 27, 2019, application number 201910566870.8, and name “Safety processing device of battery pack, power storage device and control method thereof”. Technical Field

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

[0003] Power storage devices are systems that can store and supply electric energy, and have functions such as smooth transition, peak shaving and valley filling, frequency and voltage regulation, etc. With the development of new lithium-ion battery materials, innovation in battery manufacturing technology, and the participation of many scientific research institutions and enterprises, the performance of lithium-ion batteries is increasing, the cost of batteries is decreasing, and the safety performance of batteries is greatly improved. Lithium-ion batteries are gradually showing their application advantages in the field of energy storage.

[0004] However, due to the shortcomings of low single-cell voltage and small capacity of lithium batteries, an industrial energy storage system often requires up to several thousand batteries. At the same time, lithium batteries have poor low-temperature performance and are prone to unsafe behaviors such as explosion or combustion under abuse conditions such as overcharging, short circuiting, stamping, puncture, vibration, and high-temperature thermal shock.

[0005] In the existing technology, the battery management system is relied upon to collect and process the battery's temperature, voltage, and current, and passive fire-fighting facilities are used for monitoring and protection. When encountering thermal runaway problems, individual battery modules with thermal runaway cannot be effectively handled, resulting in major and irreparable losses to the entire energy storage system. Summary of the invention

[0006] The technical problem to be solved by the present invention is to overcome the defect of passive safety measures adopted in power storage devices in the prior art, and to provide a battery pack safety processing device, a power storage device and a control method thereof.

[0007] The present invention solves the above technical problems through the following technical solutions:

[0008] A safety processing device for a battery pack, characterized in that the safety processing device comprises:

[0009] Temperature monitoring module, used to collect the temperature changes of the battery cells in the battery pack;

[0010] The temperature control module is used to determine whether the maximum battery cell temperature change in the battery pack falls into one of multiple temperature change ranges. If so, a temperature control instruction is generated according to the temperature change range within which the maximum battery cell temperature change falls, wherein different temperature change ranges correspond to different battery pack processing methods, and the temperature control instruction includes processing the battery pack according to the processing method corresponding to the temperature change range within which it falls.

[0011] Preferably, the safety processing device further comprises a security module for executing the temperature control instruction, and the security module comprises an isolation unit for pushing the battery pack out of a preset distance.

[0012] Preferably, the isolation unit includes any one of an elastic component, a push rod component, and an airbag component.

[0013] Preferably, the safety processing device further comprises a security module for executing the temperature control instruction, and the security module comprises a switch unit for cutting off the electrical connection of the battery pack.

[0014] Preferably, the safety processing device further includes a security module for executing the temperature control instruction, and the security module includes a cooling unit for cooling the battery pack.

[0015] An electric energy storage device, characterized in that the electric energy storage device comprises a temperature control module and a plurality of battery boxes, wherein the battery boxes are provided with a battery pack and a temperature monitoring module;

[0016] The battery pack includes a plurality of battery cells;

[0017] The temperature monitoring module is used to collect the temperature changes of the battery cells in the battery pack;

[0018] The temperature control module is used to determine whether the maximum battery cell temperature change in the battery pack falls into one of multiple temperature change ranges. If so, a temperature control instruction is generated according to the temperature change range within which the maximum battery cell temperature change falls, wherein different temperature change ranges correspond to different battery pack processing methods, and the temperature control instruction includes processing the battery pack according to the processing method corresponding to the temperature change range within which it falls.

[0019] Preferably, the temperature monitoring module is specifically used to collect the temperature changes of local cells at multiple local positions in the battery pack;

[0020] The temperature control module is specifically used to determine whether the maximum local battery cell temperature change in the battery pack falls into one of a plurality of temperature change ranges;

[0021] If so, it is determined that the maximum battery cell temperature variation in the battery pack falls within one of a plurality of temperature variation ranges.

[0022] Preferably, the power storage device further includes a security module for executing the temperature control instruction, the battery box includes a box door, the security module includes a trigger mechanism arranged in the battery box, the trigger mechanism is arranged opposite to the box door, and the battery pack is arranged between the box door and the trigger mechanism;

[0023] The temperature control module is specifically used to determine whether the maximum battery cell temperature change in the battery pack falls within the first temperature change range, and if so, generate a first temperature control instruction;

[0024] The door of a first battery box of a first battery pack including a battery cell whose maximum battery cell temperature variation falls within the first temperature variation range is opened according to the first temperature control instruction;

[0025] The trigger mechanism in the first battery box pushes the first battery pack away from the first battery box according to the first temperature control instruction.

[0026] Preferably, the trigger mechanism includes any one of an elastic component, a push rod component, and an airbag component;

[0027] The elastic component is used to pop out and push the first battery pack away from the first battery box according to the first temperature control instruction;

[0028] The push rod assembly is used to push out and remove the first battery pack from the first battery box according to the first temperature control instruction;

[0029] The airbag assembly is used to inflate according to the first temperature control instruction and push the first battery pack away from the first battery box.

[0030] Preferably, a plurality of rollers are provided at the bottom of the battery box, and the battery pack is arranged on the plurality of rollers.

[0031] Preferably, the minimum value of the first temperature variation range is a first threshold value, and the value range of the first threshold value is 20-22°C.

[0032] Preferably, the power storage device further includes a security module for executing the temperature control instruction, and the security module includes a plurality of energy storage converters; wherein:

[0033] Each battery pack is electrically connected to an energy storage converter;

[0034] Each energy storage converter is electrically connected to at least one battery pack.

[0035] Preferably, the temperature control module is specifically used to determine whether the maximum battery cell temperature change in the battery pack falls within the second temperature change range;

[0036] If yes, generating a second temperature control instruction, the second temperature control instruction including cutting off the electrical connection of the second battery pack including the battery cell whose maximum battery cell temperature variation falls within the second temperature variation range;

[0037] The energy storage converter electrically connected to the second battery pack is used to execute the second temperature control instruction.

[0038] Preferably, the minimum value of the second temperature variation range is a second threshold value, and the value range of the second threshold value is 10-12°C.

[0039] Preferably, the battery box is arranged on the upper part of the energy storage inverter, and a heat insulation layer is provided between the battery box and the energy storage inverter.

[0040] Preferably, the power storage device further comprises a security module for executing the temperature control instruction, and the security module comprises a plurality of air exchange devices for achieving heat exchange between the power storage device and the outside air.

[0041] Preferably, the temperature control module is specifically used to determine whether the maximum battery cell temperature change in the battery pack falls within a third temperature change range;

[0042] If yes, a third temperature control instruction is generated;

[0043] The air exchange device is started according to the third temperature control instruction.

[0044] Preferably, the minimum value of the third temperature variation range is a third threshold value, and the value range of the third threshold value is 5-7°C.

[0045] Preferably, the power storage device further comprises a temperature field monitoring module for monitoring the temperature field within the power storage device;

[0046] The temperature control module is further used to determine whether the maximum temperature difference in the temperature field is greater than a fourth threshold;

[0047] If yes, a fourth temperature control instruction is generated;

[0048] The air exchange device is started according to the fourth temperature control instruction.

[0049] Preferably, the fourth threshold value ranges from 5°C to 7°C.

[0050] Preferably, the plurality of air exchange devices are respectively arranged on the top of the power energy storage device and at a position adjacent to the energy storage converter.

[0051] A control method for an electric energy storage device, wherein the electric energy storage device comprises a plurality of battery boxes, wherein the battery boxes are provided with battery packs, and wherein the battery packs comprise a plurality of battery cells, and the control method comprises:

[0052] Collecting the temperature change of the battery cells in the battery pack;

[0053] Determining whether a maximum cell temperature change in the battery pack falls within one of a plurality of temperature change ranges, wherein different temperature change ranges correspond to different battery pack processing methods;

[0054] If so, the battery pack is processed according to a processing method corresponding to the temperature variation range within which the maximum battery cell temperature variation falls.

[0055] Preferably, the step of collecting the temperature change of the battery cells in the battery pack comprises:

[0056] Collecting changes in local battery cell temperatures at multiple local locations in the battery pack;

[0057] The step of determining whether the maximum battery cell temperature variation in the battery pack falls within one of a plurality of temperature variation ranges comprises:

[0058] determining whether a maximum local cell temperature variation in the battery pack falls within one of a plurality of temperature variation ranges;

[0059] If so, it is determined that the maximum battery cell temperature variation in the battery pack falls within one of a plurality of temperature variation ranges.

[0060] Preferably, the battery box includes a box door, the battery box also includes a trigger mechanism, the trigger mechanism is arranged opposite to the box door, the battery pack is arranged between the box door and the trigger mechanism, and the step of determining whether the maximum cell temperature change in the battery pack falls within one of a plurality of temperature change ranges includes:

[0061] Determining whether a maximum battery cell temperature variation in the battery pack falls within a first temperature variation range;

[0062] If so, the door of the first battery box having the first battery pack including the battery cells whose maximum battery cell temperature variation falls within the first temperature variation range is opened, and the trigger mechanism pushes the first battery pack away from the first battery box.

[0063] Preferably, the minimum value of the first temperature variation range is a first threshold value, and the value range of the first threshold value is 20-22°C.

[0064] Preferably, the power energy storage device further comprises a plurality of energy storage converters, each battery pack is electrically connected to an energy storage converter, and each energy storage converter is electrically connected to at least one battery pack, and the step of determining whether the maximum battery cell temperature change in the battery pack falls within one of the plurality of temperature change ranges comprises:

[0065] Determining whether a maximum battery cell temperature variation in the battery pack falls within a second temperature variation range;

[0066] If so, the energy storage converter electrically connected to the second battery pack including the battery cell whose maximum battery cell temperature variation falls within the second temperature variation range cuts off the electrical connection with the second battery pack.

[0067] Preferably, the minimum value of the second temperature variation range is a second threshold value, and the value range of the second threshold value is 10-12°C.

[0068] Preferably, the power storage device further comprises a plurality of air exchange devices for realizing heat exchange between the power storage device and the outside air, and the step of determining whether the maximum battery cell temperature change in the battery pack falls within one of the plurality of temperature change ranges comprises:

[0069] Determining whether a maximum battery cell temperature variation in the battery pack falls within a third temperature variation range;

[0070] If so, the air exchange device is activated.

[0071] Preferably, the minimum value of the third temperature variation range is a third threshold value, and the value range of the third threshold value is 5-7°C.

[0072] Preferably, the power storage device further comprises a plurality of air exchange devices for achieving heat exchange between the power storage device and the outside air, and the control method further comprises:

[0073] monitoring the temperature field within the power storage device;

[0074] Determining whether the maximum temperature difference in the temperature field is greater than a fourth threshold;

[0075] If so, the air exchange device is activated.

[0076] Preferably, the fourth threshold value ranges from 5°C to 7°C.

[0077] The positive and progressive effect of the present invention is that the present invention monitors the maximum battery cell temperature change in the battery pack, and processes the battery pack according to the processing method corresponding to the temperature change range within which the maximum battery cell temperature change in the battery pack falls, thereby being able to actively and effectively prevent thermal runaway of the battery pack and avoid causing irreparable losses. BRIEF DESCRIPTION OF THE DRAWINGS

[0078] Figure 1 Schematic diagram of a module of a safety processing device for a battery pack according to Embodiment 1 of the present invention.

[0079] Figure 2 Schematic diagram of the relationship between the processing method of the battery pack and the temperature variation range in the battery pack safety processing device according to Embodiment 1 of the present invention.

[0080] Figure 3 Schematic diagram of a module of an electric energy storage device according to Embodiment 2 of the present invention.

[0081] Figure 4 1 is a circuit connection diagram of an energy storage converter and a battery pack in an electric energy storage device according to Embodiment 2 of the present invention.

[0082] Figure 5 Schematic diagram of the partial structure of a battery cabinet in an electric energy storage device according to Example 2 of the present invention.

[0083] Figure 6 Schematic diagram of the structure of an electric energy storage device according to Example 2 of the present invention.

[0084] Figure 7 Flow chart of a control method for an electric energy storage device according to Embodiment 3 of the present invention.

[0085] Figure 8 This is a specific flow chart of a control method for an electric energy storage device according to Embodiment 3 of the present invention.

[0086] Fig. 9 This is a flowchart of step S102 in the control method of the power storage device according to embodiment 3 of the present invention. DETAILED DESCRIPTION

[0087] The present invention is further described below by way of examples, but the present invention is not limited to the scope of the examples.

[0088] Example 1

[0089] This embodiment provides a battery pack safety processing device. Figure 1 Schematic diagram of the modules of this embodiment is shown. Figure 1 The safety processing device of this embodiment includes: a temperature monitoring module 11, a temperature control module 12 and a security module 13.

[0090] Specifically, in this embodiment, the temperature monitoring module 11 is used to collect the temperature changes of each battery cell in the battery pack, wherein the temperature monitoring module 11 can use a temperature sensor such as an optical fiber temperature sensor, and the temperature changes of the battery cells may include but are not limited to the temperature rise or temperature difference of the battery cells.

[0091] The temperature control module 12 is used to determine whether the maximum battery cell temperature change among all battery cell temperature changes in the battery pack collected by the temperature monitoring module 11 falls into one of multiple temperature change ranges, wherein each temperature change range can be customized according to the actual application, and different temperature change ranges can correspond to different battery pack processing methods. If the temperature control module 12 determines that it is yes, it generates a temperature control instruction according to the temperature change range in which the maximum battery cell temperature change falls, and the temperature control instruction includes processing the battery pack according to the processing method corresponding to the temperature change range that falls.

[0092] The security module 13 is used to execute the temperature control instruction generated by the temperature control module 12 to process the battery pack in a manner corresponding to the temperature variation range into which the maximum battery cell temperature variation falls, thereby playing a role in preventing the battery pack from being damaged.

[0093] In this embodiment, the processing methods of the battery pack may include but are not limited to cooling, power off and isolation, wherein cooling, power off and isolation play an increasingly important role in preventing the safety of the battery pack, and the minimum values ​​of the temperature variation ranges corresponding to the three processing methods of cooling, power off and isolation may be from low to high. Specifically, the relationship between the above three processing methods and the temperature variation range may be as follows: Figure 2 As shown. As the temperature change of the battery cell inevitably includes a change process from small to large as the battery pack is used, in the face of multiple preset temperature change ranges, there can be three combined processing methods: cooling the battery pack (falling into the temperature change range corresponding to cooling but not falling into the power-off range), cooling and powering off the battery pack (falling into the temperature change range corresponding to power-off but not falling into the isolation range), and cooling and powering off the battery pack and isolating the battery pack (falling into the isolation range).

[0094] Specifically, the security module 13 may include a cooling unit 131. When the temperature change range within which the maximum battery cell temperature changes falls corresponds to cooling, the cooling unit 131 is used to cool the battery pack and perform safety precautions from the outside of the battery pack to prevent the temperature of the battery pack from further increasing.

[0095] The security module 13 may also include a switch unit 132. When the temperature variation range into which the maximum battery cell temperature variation falls corresponds to a power-off processing method, the switch unit 132 is used to cut off the electrical connection of the battery pack, thereby preventing the battery pack from further releasing heat during the discharge process and causing thermal hazards. In addition, if the minimum value of the temperature variation range corresponding to the power-off processing method is greater than the minimum value of the temperature variation range corresponding to the cooling processing method, then the current maximum battery cell temperature also falls into the temperature variation range for which the cooling processing method is used. It can be understood that the cooling processing method can no longer prevent the further increase of the battery cell temperature variation, so the battery pack can be powered off while being cooled.

[0096] The security module 13 may also include an isolation unit 133. When the temperature change range into which the maximum battery cell temperature change falls corresponds to the treatment method of isolation, the isolation unit 133 is used to push the battery pack out of a preset distance, wherein the preset distance can be set according to the actual placement position of the battery pack, so as to avoid the battery pack from catching fire at its original placement position and thus affecting the power safety of other power modules around it. In this embodiment, the isolation unit 133 may include but is not limited to an elastic component, a push rod component, an airbag component, etc.

[0097] In this embodiment, by monitoring the maximum battery cell temperature change in the battery pack and processing the battery pack according to the processing method corresponding to the temperature change range within which the maximum battery cell temperature change in the battery pack falls, thermal runaway of the battery pack can be actively and effectively prevented to avoid irreparable losses.

[0098] Example 2

[0099] This embodiment provides an electric energy storage device, Figure 3 Schematic diagram of the modules of this embodiment is shown. Figure 3 The power storage device of this embodiment includes: a temperature control module 21, a security module 22 and a plurality of battery boxes 23.

[0100] Reference Figure 3 In this embodiment, a battery pack 231 and a temperature monitoring module 232 are provided in the battery box 23. The battery pack 231 includes a plurality of battery cells. The temperature monitoring module 232 is used to collect the temperature change of each battery cell in the battery pack 231. The temperature monitoring module 232 may use a temperature sensor such as an optical fiber temperature sensor, and the temperature change of the battery cell may include but is not limited to the temperature rise or temperature difference of the battery cell.

[0101] The temperature control module 21 is used to determine whether the maximum battery cell temperature change among all battery cell temperature changes in the battery pack 231 collected by the temperature monitoring module 232 falls into one of multiple temperature change ranges, where different temperature change ranges can correspond to different battery pack processing methods. If the temperature control module 21 determines that it is yes, it generates a temperature control instruction according to the temperature change range in which the maximum battery cell temperature change falls, and the temperature control instruction includes processing the battery pack 231 according to the processing method corresponding to the temperature change range that falls.

[0102] The security module 22 is used to execute the temperature control instruction generated by the temperature control module 21 to process the battery pack 231 in a processing manner corresponding to the temperature variation range into which the maximum battery cell temperature variation falls, thereby playing a role in preventing the battery pack from being damaged.

[0103] In this embodiment, the temperature monitoring module 232 is specifically used to collect the local cell temperature changes of multiple (for example, 5 or more) local positions of each cell in the battery pack 231, and the temperature control module 21 is specifically used to determine whether the maximum local cell temperature change among all local cell temperature changes in the battery pack 231 falls into one of the multiple temperature change ranges, and if so, determine whether the maximum cell temperature change in the battery pack 231 falls into one of the multiple temperature change ranges. Therefore, this embodiment is more sensitive to the change of cell temperature, and can more accurately feedback the cell temperature change.

[0104] In this embodiment, a third temperature variation range, a second temperature variation range, and a first temperature variation range with minimum values ​​from small to large can be preset, which correspond to the following battery pack processing methods: cooling, power off, and isolation. It should be understood that the three temperature variation ranges and the three battery pack processing methods in this embodiment are intended to illustrate this embodiment rather than limit it. In addition, in this embodiment, the role of cooling, power off, and isolation in preventing the safety of the battery pack is constantly deepening. The temperature change of the battery cell must include a process from small to large as the battery pack is used. Therefore, the preset third temperature variation range, the second temperature variation range, and the first temperature variation range can respectively correspond to the three combined processing methods of cooling the battery pack, cooling and powering off the battery pack, and isolating the battery pack after cooling and powering off the battery pack.

[0105] Reference Figure 3 In this embodiment, the security module 22 includes a plurality of air exchange devices 221 for realizing heat exchange between the power storage device and the outside air, and performing safety precautions from the outside of the battery pack 231 to prevent the temperature of the battery pack 231 from further increasing.

[0106] Specifically, in this embodiment, the temperature control module 21 determines whether the maximum battery cell temperature change in the battery pack 231 falls within a third temperature change range, wherein the minimum value of the third temperature change range is a third threshold value, and the value range of the third threshold value may be 5-7°C. If the temperature control module 21 determines that it is yes, a third temperature control instruction is generated, and the air exchange device 221 is started according to the third temperature control instruction to perform heat exchange between the power storage device and the outside air to cool the battery pack 231.

[0107] Reference Figure 3 In this embodiment, the security module 22 also includes a plurality of energy storage converters 222 . Figure 4 A circuit connection diagram of the energy storage inverter 222 and the battery pack 231 is shown, wherein each battery pack 231 is electrically connected to an energy storage inverter 222 , and each energy storage inverter 222 is electrically connected to at least one battery pack 231 , so that the energy storage inverter 222 can achieve individual control of multiple battery packs 231 .

[0108] Specifically, while cooling the battery pack 231, in order to avoid further increase in the temperature change of the battery cell, the temperature control module 21 also determines whether the maximum battery cell temperature change in the battery pack 231 falls within the second temperature change range, wherein the minimum value of the second temperature change range is the second threshold value, and the value range of the second threshold value can be 10-12°C. If the temperature control module 21 determines that it is yes, it generates a second temperature control instruction for cutting off the electrical connection of the second battery pack including the battery cell whose maximum battery cell temperature change falls within the second temperature change range, and the energy storage converter 222 electrically connected to the second battery pack is used to execute the second temperature control instruction to cut off the electrical connection with the second battery pack to prevent the second battery pack from releasing heat and causing thermal hazards during further discharge. It can be understood that the cooling treatment method can no longer curb the further increase in the battery cell temperature change, so the battery pack can be powered off while cooling it.

[0109] Reference Figure 3 In this embodiment, the battery box 23 also includes a box door 233, and the security module 22 also includes a trigger mechanism 223 disposed in the battery box 23. The trigger mechanism 223 is arranged opposite to the box door 233, and the battery pack 231 is arranged between the box door 233 and the trigger mechanism 223.

[0110] Specifically, while cooling the battery pack 231 and disconnecting its electrical connection with the energy storage inverter 222, in order to avoid further increase in the temperature change of the battery cells, the temperature control module 21 also determines whether the maximum battery cell temperature change in the battery pack 231 falls within the first temperature change range, wherein the minimum value of the first temperature change range is the first threshold value, and the value range of the first threshold value can be 20-22°C. If the temperature judgment module 21 determines that it is yes, a first temperature control instruction is generated, and the door of the first battery box of the first battery pack including the battery cells whose maximum battery cell temperature change falls within the first temperature change range is opened according to the first temperature control instruction, and the trigger mechanism 223 in the first battery box pushes the first battery pack away from the first battery box according to the first temperature control instruction, thereby achieving physical isolation between the first battery pack and the first battery box, thereby avoiding a fire in the first battery pack and thus affecting the power safety of other power modules of the power storage device around the first battery box.

[0111] Furthermore, in this embodiment, the trigger mechanism 223 may include any one of an elastic component, a push rod component, and an airbag component, wherein the elastic component is used to pop out and push the first battery pack from the first battery box according to the first temperature control instruction, the push rod component is used to push out and push the first battery pack from the first battery box according to the first temperature control instruction, and the airbag component is used to inflate and push the first battery pack from the first battery box according to the first temperature control instruction. In addition, in this embodiment, the bottom of the battery box 23 may be provided with a plurality of rollers, and the battery pack 231 may be arranged on the plurality of rollers. When the trigger mechanism 223 is triggered according to the first temperature control instruction, it is easy to push the first battery pack from the first battery box, thereby further improving the safety performance of the power storage device.

[0112] Reference Figure 3 In this embodiment, the power storage device may further include a temperature field monitoring module 24 for monitoring the temperature field in the power storage device. The temperature control module 21 may also be used to determine whether the maximum temperature difference in the temperature field is greater than a fourth threshold value, wherein the fourth threshold value may be customized according to the actual application. In this embodiment, the value range of the fourth threshold value may be 5-7°C. If the temperature control module 21 determines that it is yes, a fourth temperature control instruction is generated. The air exchange device 221 is started according to the fourth temperature control instruction to perform heat exchange between the power storage device and the outside air to cool down the battery pack 231. Thus, in this embodiment, the air exchange device 221 may be started according to the third temperature control instruction generated based on the monitoring of the temperature change of the battery cells in the battery pack 231, or may be started according to the fourth instruction generated based on the monitoring of the temperature field in which the power storage device is located.

[0113] In this embodiment, the battery pack 231 is disposed in a battery cabinet. Figure 5A partial structural diagram of the battery cabinet in this embodiment is shown. Figure 5 The battery cabinet includes a battery pack 231, a trigger mechanism 223, and an energy storage converter cabinet, wherein the battery pack 231 is disposed on the upper portion of the energy storage converter cabinet, and the battery pack 231 is disposed in the battery box 23, and the energy storage converter 222 is disposed in the energy storage converter cabinet, that is, in this embodiment, the battery box 23 may be disposed on the upper portion of the energy storage converter 222. In addition, in this embodiment, a heat insulation layer may be disposed between the battery box 23 and the energy storage converter 222.

[0114] Figure 6 The schematic diagram of the structure of the power storage device of this embodiment is shown. Figure 6 The power storage device can adopt a box structure, wherein the power storage device includes a battery cabinet and a plurality of air exchange devices 221. In addition, in this embodiment, the energy storage inverter (not shown in the figure) is arranged at the lower part of the battery cabinet, and air exchange devices 221 are respectively arranged at the top of the power storage device and at the position adjacent to the energy storage inverter, thereby forming a heat exchange channel in the other remaining space of the power storage device to realize cyclic air exchange, which can reduce energy consumption compared with the conventional method of using air conditioning to control temperature.

[0115] In this embodiment, by monitoring the maximum battery cell temperature change in the battery pack and processing the battery pack according to the processing method corresponding to the temperature change range within which the maximum battery cell temperature change in the battery pack falls, thermal runaway of the battery pack in the power storage device can be actively and effectively prevented to avoid irreparable losses to the power storage device.

[0116] Example 3

[0117] This embodiment provides a control method for an electric energy storage device, wherein the electric energy storage device includes a plurality of battery boxes, wherein a battery pack is provided in the battery box, and the battery pack includes a plurality of battery cells. Figure 7 A flowchart of this embodiment is shown, referring to Figure 7 , the control method of this embodiment includes:

[0118] S101, collecting the temperature change of each battery cell in the battery pack;

[0119] S102, determining whether a maximum battery cell temperature change in the battery pack falls within one of a plurality of temperature change ranges;

[0120] If yes, go to step S103;

[0121] S103 , processing the battery pack according to a processing method corresponding to the temperature variation range within which the maximum battery cell temperature variation falls.

[0122] In this embodiment, the temperature change of the battery cell may include but is not limited to the temperature rise or temperature difference of the battery cell. Figure 8 , step S101 may include:

[0123] S101A, collecting local cell temperature changes at multiple local locations of each cell in the battery pack;

[0124] Among them, for each battery cell, at least 5 local battery cell temperature changes can be collected.

[0125] Step S102 may include:

[0126] S102A, determining whether the maximum local cell temperature variation in the battery pack falls within one of a plurality of temperature variation ranges;

[0127] If yes, go to step S102B;

[0128] S102B: Determine whether the maximum battery cell temperature variation in the battery pack falls within one of a plurality of temperature variation ranges.

[0129] Therefore, this embodiment is more sensitive to changes in the battery cell temperature, and can more accurately feedback changes in the battery cell temperature.

[0130] In this embodiment, a third temperature variation range, a second temperature variation range, and a first temperature variation range with minimum values ​​from small to large can be preset, which correspond to the following battery pack processing methods: cooling, power off, and isolation. It should be understood that the three temperature variation ranges and the three battery pack processing methods in this embodiment are intended to illustrate this embodiment rather than limit it. In addition, in this embodiment, the role of cooling, power off, and isolation in preventing the safety of the battery pack is constantly deepening. The temperature change of the battery cell must include a process from small to large as the battery pack is used. Therefore, the preset third temperature variation range, the second temperature variation range, and the first temperature variation range can respectively correspond to the three combined processing methods of cooling the battery pack, cooling and powering off the battery pack, and isolating the battery pack after cooling and powering off the battery pack.

[0131] In the present embodiment, the power storage device may further include a plurality of air exchange devices to achieve heat exchange between the power storage device and the outside air, and to perform safety precautions from the outside of the battery pack to prevent the temperature of the battery pack from further increasing. In the present embodiment, the power storage device may further include a plurality of energy storage inverters, each battery pack is electrically connected to an energy storage inverter, and each energy storage inverter is electrically connected to at least one battery pack, so that the energy storage inverter can achieve separate control of multiple battery packs. In the present embodiment, the battery box may include a box door, and the battery box may further include a trigger mechanism, the trigger mechanism is arranged opposite to the box door, and the battery pack is arranged between the box door and the trigger mechanism. Based on this, refer to Fig. 9Step S102 may specifically include:

[0132] S1021, determining whether the maximum battery cell temperature change in the battery pack falls within a third temperature change range;

[0133] If yes, go to step S1022; if no, return to step S1021;

[0134] S1022, start the air exchange device;

[0135] S1023, determining whether the maximum battery cell temperature change in the battery pack falls within the second temperature change range;

[0136] If yes, go to step S1024; if no, return to step S1021;

[0137] S1024, the energy storage converter electrically connected to the second battery pack including the battery cell whose maximum battery cell temperature variation falls within the second temperature variation range cuts off the electrical connection with the second battery pack;

[0138] S1025, determining whether the maximum battery cell temperature change in the battery pack falls within a first temperature change range;

[0139] If yes, go to step S1026; if no, return to step S1023;

[0140] S1026, opening a door of a first battery box having a first battery pack including battery cells whose maximum battery cell temperature variation falls within a first temperature variation range, and triggering a mechanism to push the first battery pack away from the first battery box.

[0141] In this embodiment, the minimum values ​​of the third temperature change range, the second temperature change range and the first temperature change range are the third threshold, the second threshold and the first threshold, respectively, wherein the value range of the third threshold can be 5-7°C, the value range of the second threshold is 10-12°C, and the value range of the first threshold can be 20-22°C.

[0142] After the battery pack is cooled down in step S1022, the maximum battery cell temperature may decrease and then increase as the battery pack discharges, until it falls into the second temperature change range and the electrical connection with the battery pack is cut off in step S1024. Therefore, the cooling treatment method can no longer curb the further increase of the battery cell temperature change. In order to prevent the battery pack from releasing heat during further discharge and causing thermal hazards and avoid further increase of the battery cell temperature change, the battery pack can be powered off while being cooled.

[0143] After step S1024, if the maximum battery cell temperature change still increases or even falls into the first temperature change range, there may be a situation where the power-off battery pack may spontaneously combust, which requires further safety precautions. Then, step S1026 is performed to physically isolate the battery pack from the battery box, thereby preventing the battery pack from spontaneously combusting in the battery box and thus affecting the power safety of other power modules of the power storage device around the battery box.

[0144] In this embodiment, when the judgment in step S1021 is yes, the air exchange device can be started, which is based on the monitoring of the temperature change of the battery cells in the battery pack. Further, in this embodiment, the air exchange device can also be started based on the monitoring of the temperature field in which the power energy storage device is located. Based on this, the control method of this embodiment can also include the following steps:

[0145] Monitor the temperature field in the power storage device; determine whether the maximum temperature difference in the temperature field is greater than a fourth threshold; if so, start the air exchange device.

[0146] The fourth threshold value may be in the range of 5-7°C.

[0147] In this embodiment, by monitoring the maximum battery cell temperature change in the battery pack and processing the battery pack according to the processing method corresponding to the temperature change range within which the maximum battery cell temperature change in the battery pack falls, thermal runaway of the battery pack in the power storage device can be actively and effectively prevented to avoid irreparable losses to the power storage device.

[0148] Although the specific embodiments of the present invention are described above, it should be understood by those skilled in the art that this is only for illustration and the protection scope of the present invention is defined by the appended claims. Those skilled in the art may make various changes or modifications to these embodiments without departing from the principles and essence of the present invention, but these changes and modifications all fall within the protection scope of the present invention.

Claims

1. A battery pack safety processing device, characterized in that: The security processing device comprises: Temperature monitoring module, used to collect the temperature changes of the battery cells in the battery pack; A temperature control module is used to determine whether the maximum battery cell temperature change in the battery pack falls into one of multiple temperature change ranges. If so, a temperature control instruction is generated according to the temperature change range in which the maximum battery cell temperature change falls, wherein different temperature change ranges correspond to different processing methods for the battery pack, and the temperature control instruction includes processing the battery pack according to the processing method corresponding to the temperature change range in which it falls; wherein the processing methods include isolation, power off and cooling, and the minimum values ​​in the temperature change ranges corresponding to the three processing methods of cooling, power off and isolation are performed from low to high; the processing method corresponding to the temperature change range corresponding to cooling but not falling into the power off is to cool the battery pack, the processing method corresponding to the temperature change range corresponding to power off but not falling into isolation is to cool and power off the battery pack, and the processing method corresponding to the temperature change range corresponding to isolation is to isolate the battery pack after cooling and powering off the battery pack; The safety processing device further includes a security module for executing the temperature control instruction, the security module includes an isolation unit, and the isolation unit is used to push the battery pack out of a preset distance; The safety processing device also includes a security module for executing the temperature control instruction. The security module includes a switch unit for cutting off the electrical connection of the battery pack.

2. The battery pack safety processing device according to claim 1, characterized in that: The isolation unit includes any one of an elastic component, a push rod component, and an airbag component.

3. The battery pack safety processing device according to claim 1, characterized in that: The safety processing device also includes a security module for executing the temperature control instruction. The security module includes a cooling unit for cooling the battery pack.

4. An electric energy storage device, characterized in that: The power storage device includes a temperature control module and a plurality of battery boxes, wherein the battery boxes are provided with a battery pack and a temperature monitoring module; The battery pack includes a plurality of battery cells; The temperature monitoring module is used to collect the temperature changes of the battery cells in the battery pack; The temperature control module is used to determine whether the maximum battery cell temperature change in the battery pack falls into one of multiple temperature change ranges. If so, a temperature control instruction is generated according to the temperature change range in which the maximum battery cell temperature change falls, wherein different temperature change ranges correspond to different processing methods for the battery pack, and the temperature control instruction includes processing the battery pack according to the processing method corresponding to the temperature change range in which it falls; wherein the processing method includes isolation, power off and cooling, and the minimum values ​​in the third temperature change range, the second temperature change range and the first temperature change range are from small to large; the processing method corresponding to the third temperature change range is to cool the battery pack, the processing method corresponding to the second temperature change range is to cool the battery pack and cut off the power, and the processing method corresponding to the first temperature change range is to isolate the battery pack after cooling and cutting off the power.

5. The power storage device according to claim 4, characterized in that: The temperature monitoring module is specifically used to collect the temperature changes of local cells at multiple local locations in the battery pack; The temperature control module is specifically used to determine whether the maximum local battery cell temperature change in the battery pack falls into one of a plurality of temperature change ranges; If so, it is determined that the maximum battery cell temperature variation in the battery pack falls within one of a plurality of temperature variation ranges.

6. The power storage device according to claim 4, characterized in that: The power storage device further includes a security module for executing the temperature control instruction, the battery box includes a box door, the security module includes a trigger mechanism disposed in the battery box, the trigger mechanism is disposed opposite to the box door, and the battery pack is disposed between the box door and the trigger mechanism; The temperature control module is specifically used to determine whether the maximum battery cell temperature change in the battery pack falls within the first temperature change range, and if so, generate a first temperature control instruction; The door of a first battery box of a first battery pack including a battery cell whose maximum battery cell temperature variation falls within the first temperature variation range is opened according to the first temperature control instruction; The trigger mechanism in the first battery box pushes the first battery pack away from the first battery box according to the first temperature control instruction; A plurality of rollers are provided at the bottom of the battery box, and the battery pack is arranged on the plurality of rollers; The minimum value of the first temperature variation range is a first threshold value, and the value range of the first threshold value is 20-22°C.

7. The power storage device according to claim 6, characterized in that: The trigger mechanism includes any one of an elastic component, a push rod component, and an airbag component; The elastic component is used to pop out and push the first battery pack away from the first battery box according to the first temperature control instruction; The push rod assembly is used to push out and remove the first battery pack from the first battery box according to the first temperature control instruction; The airbag assembly is used to inflate according to the first temperature control instruction and push the first battery pack away from the first battery box.

8. The power storage device according to claim 4, characterized in that: The power storage device also includes a security module for executing the temperature control instruction, and the security module includes a plurality of energy storage converters; wherein: Each battery pack is electrically connected to an energy storage converter; Each energy storage converter is electrically connected to at least one battery pack; The temperature control module is specifically used to determine whether the maximum battery cell temperature change in the battery pack falls within the second temperature change range; If yes, generating a second temperature control instruction, the second temperature control instruction including cutting off the electrical connection of the second battery pack including the battery cell whose maximum battery cell temperature variation falls within the second temperature variation range; The energy storage converter electrically connected to the second battery pack is used to execute the second temperature control instruction; The battery box is arranged on the upper part of the energy storage converter, and a heat insulation layer is arranged between the battery box and the energy storage converter.

9. The power storage device according to claim 8, characterized in that: The minimum value of the second temperature variation range is a second threshold value, and the value range of the second threshold value is 10-12°C.

10. The electric energy storage device according to claim 4, characterized in that: The power storage device also includes a security module for executing the temperature control instruction. The security module includes a plurality of air exchange devices for achieving heat exchange between the power storage device and the outside air.

11. The electric energy storage device according to claim 10, characterized in that: The temperature control module is specifically used to determine whether the maximum battery cell temperature change in the battery pack falls within a third temperature change range; If yes, a third temperature control instruction is generated; The air exchange device is started according to the third temperature control instruction.

12. The power storage device according to claim 11, characterized in that: The minimum value of the third temperature variation range is a third threshold value, and the value range of the third threshold value is 5-7°C.

13. The power storage device according to claim 10, characterized in that: The power storage device further comprises a temperature field monitoring module for monitoring the temperature field within the power storage device; The temperature control module is further used to determine whether the maximum temperature difference in the temperature field is greater than a fourth threshold; If yes, a fourth temperature control instruction is generated; The air exchange device is started according to the fourth temperature control instruction.

14. The electric energy storage device according to claim 13, characterized in that: The value range of the fourth threshold is 5-7°C.

15. The electric energy storage device according to claim 10, characterized in that: The plurality of air exchange devices are respectively arranged on the top of the power energy storage device and at a position adjacent to the energy storage converter.

16. A control method for an electric energy storage device, characterized in that: The power storage device includes a plurality of battery boxes, each of which is provided with a battery pack, each of which includes a plurality of battery cells, and the control method includes: Collecting the temperature change of the battery cells in the battery pack; Determine whether the maximum cell temperature change in the battery pack falls within one of a plurality of temperature change ranges, wherein different temperature change ranges correspond to different processing methods for the battery pack; the processing methods include isolation, power off and cooling, and the minimum values ​​in the third temperature change range, the second temperature change range and the first temperature change range are arranged from small to large; the processing method corresponding to the third temperature change range is cooling the battery pack, the processing method corresponding to the second temperature change range is cooling and powering off the battery pack, and the processing method corresponding to the first temperature change range is isolating the battery pack in addition to cooling and powering off the battery pack; If so, processing the battery pack according to a processing method corresponding to the temperature variation range within which the maximum battery cell temperature variation falls; The step of collecting the temperature change of the battery cells in the battery pack comprises: Collecting changes in local battery cell temperatures at multiple local locations in the battery pack; The step of determining whether the maximum battery cell temperature variation in the battery pack falls within one of a plurality of temperature variation ranges comprises: determining whether a maximum local cell temperature variation in the battery pack falls within one of a plurality of temperature variation ranges; If yes, determining that the maximum cell temperature variation in the battery pack falls within one of a plurality of temperature variation ranges; The battery box includes a box door, and the battery box also includes a trigger mechanism, the trigger mechanism is arranged opposite to the box door, and the battery pack is arranged between the box door and the trigger mechanism. The step of determining whether the maximum cell temperature change in the battery pack falls into one of multiple temperature change ranges includes: Determining whether a maximum battery cell temperature variation in the battery pack falls within a first temperature variation range; If so, the door of the first battery box having the first battery pack including the battery cells whose maximum battery cell temperature variation falls within the first temperature variation range is opened, and the trigger mechanism pushes the first battery pack away from the first battery box.

17. The control method of the electric energy storage device according to claim 16, characterized in that: The minimum value of the first temperature variation range is a first threshold value, and the value range of the first threshold value is 20-22°C.

18. The control method of the electric energy storage device according to claim 16, characterized in that: The power storage device further includes a plurality of energy storage converters, each battery pack is electrically connected to an energy storage converter, and each energy storage converter is electrically connected to at least one battery pack. The step of determining whether the maximum battery cell temperature change in the battery pack falls within one of the plurality of temperature change ranges includes: Determining whether a maximum battery cell temperature variation in the battery pack falls within a second temperature variation range; If so, the energy storage converter electrically connected to the second battery pack including the battery cell whose maximum battery cell temperature variation falls within the second temperature variation range cuts off the electrical connection with the second battery pack.

19. The control method of the electric energy storage device according to claim 18, characterized in that: The minimum value of the second temperature variation range is a second threshold value, and the value range of the second threshold value is 10-12°C.

20. The control method of the electric energy storage device according to claim 16, characterized in that: The power storage device further includes a plurality of air exchange devices for realizing heat exchange between the power storage device and the outside air. The step of determining whether the maximum battery cell temperature change in the battery pack falls within one of the multiple temperature change ranges includes: Determining whether a maximum battery cell temperature variation in the battery pack falls within a third temperature variation range; If so, the air exchange device is activated.

21. The control method of the electric energy storage device according to claim 20, characterized in that: The minimum value of the third temperature variation range is a third threshold value, and the value range of the third threshold value is 5-7°C.

22. The control method of the electric energy storage device according to claim 16, characterized in that: The power storage device further includes a plurality of air exchange devices for realizing heat exchange between the power storage device and the outside air. The control method further includes: monitoring the temperature field within the power storage device; Determining whether the maximum temperature difference in the temperature field is greater than a fourth threshold; If so, the air exchange device is activated.

23. The control method of the electric energy storage device according to claim 22, characterized in that: The value range of the fourth threshold is 5-7°C.

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