Liquid cooling system of battery cluster, battery management system and electric equipment

Abstract

The invention provides a liquid cooling system of a battery cluster, a battery management system and electric equipment, the battery cluster comprises at least one battery pack, and the liquid cooling system comprises a power pump, a liquid inlet pipeline, a liquid outlet pipeline, a first-stage shunting pipeline arranged in each battery pack, and a monitoring module of a communication valve; one end of the power pump is connected with one end of the liquid inlet pipeline, the other end of the liquid inlet pipeline is connected with one end of the primary shunting pipeline of each battery pack, the other end of the primary shunting pipeline of each battery pack is connected with one end of the liquid outlet pipeline, and the other end of the liquid outlet pipeline is connected with the other end of the power pump to form a liquid cooling loop; and the communication valve is arranged on the first-stage shunting pipeline and is used for disconnecting the liquid cooling loop when the monitoring module monitors that the temperature of the battery pack is abnormal, so that the cooling liquid is poured into the battery pack through the communication valve. The liquid cooling loop is disconnected through the communication valve when the monitoring module monitors that the temperature of the battery pack is abnormal, so that cooling liquid is poured into the battery pack, and thermal runaway is restrained.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a liquid cooling system for a battery cluster, a battery management system, and an electrical device. Background Art

[0002] Energy storage batteries are mainly in the form of battery clusters. Each battery cluster contains multiple battery packs, which are composed of multiple battery cells connected in series. The energy density of energy storage batteries is high, which will increase the risk of thermal runaway and heat spread. Therefore, energy storage batteries need to both dissipate heat and suppress thermal runaway to prevent heat spread and chain runaway accidents.

[0003] In the prior art, the heat dissipation structure of the energy storage battery adopts two liquid cooling circuits, an external circuit and an internal circuit. The external circuit is cooled by coolant, and the internal circuit is cooled by immersing the battery pack in refrigerant. The external circuit is used to cool the internal circuit, and the liquid cooling circuit is complicated. Secondly, the amount of immersion refrigerant is extremely large. A high-power machine is required to mobilize the internal circulation. Moreover, when the thermal runaway temperature of the battery cell is exceeded, the refrigerant will burn and cannot protect the safety of the equipment. Summary of the invention

[0004] The embodiments of the present application provide a liquid cooling system for a battery cluster, a battery management system, and an electrical device to solve the heat dissipation and thermal runaway problems of the battery cluster.

[0005] In a first aspect, an embodiment of the present application provides a liquid cooling system for a battery cluster, the battery cluster comprising at least one battery pack, the liquid cooling system comprising: a power pump, a liquid inlet pipe, a liquid outlet pipe, and a primary shunt pipe and a monitoring module for a connecting valve disposed in each battery pack;

[0006] One end of the power pump is connected to one end of the liquid inlet pipe, the other end of the liquid inlet pipe is connected to one end of the primary shunt pipe of each battery pack, the other end of the primary shunt pipe of each battery pack is connected to one end of the liquid outlet pipe, and the other end of the liquid outlet pipe is connected to the other end of the power pump, forming a liquid cooling circuit inside the battery pack;

[0007] A monitoring module is used to monitor whether there is temperature abnormality in the battery pack;

[0008] The connecting valve is arranged on the primary shunt pipe, and is used to disconnect the liquid cooling circuit when the temperature is abnormal, so that the coolant can be poured into the battery pack through the connecting valve.

[0009] In one embodiment, the battery management system is provided with a main control module, and the main control module is respectively communicated with the monitoring module and the connecting valve;

[0010] The monitoring module is used to send an alarm signal indicating the temperature abnormality to the main control module when the monitoring data of the battery pack indicates that the battery pack has a temperature abnormality;

[0011] The main control module is used to determine whether to send a control signal to the connecting valve according to the abnormal battery pack temperature represented by the alarm signal.

[0012] In one embodiment, the main control module is also used to output an alarm signal and / or record an alarm signal.

[0013] In one of the embodiments, the monitoring module is also in communication with the communication valve;

[0014] The monitoring module is also used to send a control signal to the connecting valve when the monitoring data of the battery pack indicates that the temperature of the battery pack is abnormal and there is a risk of thermal runaway.

[0015] In one of the embodiments, the monitoring data includes at least one of electrolyte gas detection data, combustion characteristic gas detection data, smoke detection data, photosensitive detection data and temperature detection data.

[0016] In one of the embodiments, the liquid cooling system further comprises a sampling module, and the monitoring module is communicatively connected to the main control module via the sampling module;

[0017] A monitoring module, used for sending monitoring data to a sampling device;

[0018] The sampling module is used to collect the cell voltage signal and temperature signal in the battery pack, and send the cell voltage signal, temperature signal and monitoring data to the main control module.

[0019] In one of the embodiments, the connecting valve is further used to disconnect the liquid cooling circuit upon receiving an external control signal.

[0020] In one embodiment, the communication valve includes a control hub, a telescopic clamping column, and a switch structure;

[0021] The switch structure includes: a fixed joint and a clamping spring; the first-level shunt pipeline includes two sections of cold pipes; the fixed joint is used to connect the two sections of cold pipes, the clamping spring has a clamping groove, and the clamping groove and the telescopic clamping column structure lock the fixed joint to connect the two sections of cold pipes;

[0022] The control center includes a control unit and a receiving cavity for receiving the telescopic card column;

[0023] The control unit is used to control the retractable clamping column to retract when receiving a control instruction, so that the clamping slot is separated from the fixed joint and the two sections of the cold pipe are disconnected.

[0024] In one of the embodiments, the battery pack includes at least one battery module, and the liquid cooling system further includes at least one secondary shunt pipe disposed in the battery pack;

[0025] The secondary shunt pipe is connected to the primary shunt pipe as a lower shunt pipe of the primary shunt pipe, wherein one secondary shunt pipe corresponds to one battery module, forming a liquid cooling circuit of the battery module for cooling the battery module.

[0026] In one of the embodiments, the cooling device is arranged outside the battery pack and in the passage between the power pump, the liquid inlet pipe and the liquid outlet pipe, and is used to adjust the temperature of the coolant.

[0027] In one embodiment, the cooling device is a liquid cooling system.

[0028] In a second aspect, an embodiment of the present application provides a battery management system, including a main control module and any of the above-mentioned liquid cooling systems.

[0029] In a third aspect, an embodiment of the present application provides an electric device, including at least one battery cluster and the above-mentioned battery management system.

[0030] The embodiments of the present application provide a liquid cooling system, a battery management system and an electrical device for a battery cluster, wherein the battery cluster includes at least one battery pack, and the liquid cooling system includes: a power pump, a liquid inlet pipe, a liquid outlet pipe, and a primary shunt pipe and a monitoring module of a connecting valve arranged in each battery pack; one end of the power pump is connected to one end of the liquid inlet pipe, and the other end of the liquid inlet pipe is connected to one end of the primary shunt pipe of each battery pack, and the other end of the primary shunt pipe of each battery pack is connected to one end of the liquid outlet pipe, and the other end of the liquid outlet pipe is connected to the other end of the power pump, thereby forming a liquid cooling circuit inside the battery pack; a monitoring module is used to monitor whether there is a temperature abnormality in the battery pack; the connecting valve is arranged on the primary shunt pipe, and is used to disconnect the liquid cooling circuit when the temperature is abnormal, so that the coolant can be poured into the battery pack through the connecting valve. The present application solves the heat dissipation problem of the battery cluster through a liquid cooling circuit formed by a power pump, a liquid inlet pipe, a liquid outlet pipe, and a primary shunt pipe. The heat dissipation circuit is simple. Secondly, the connecting valve disconnects the liquid cooling circuit when the monitoring module detects abnormal temperature of the battery pack, allowing the coolant to be injected into the battery pack, thereby suppressing thermal runaway and avoiding heat spread accidents. BRIEF DESCRIPTION OF THE DRAWINGS

[0031] The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the present application and, together with the description, serve to explain the principles of the present application.

[0032] Figure 1 A schematic structural diagram of a liquid cooling system for a battery cluster provided in one embodiment of the present application;

[0033] Figure 2 A schematic diagram of a monitoring module provided in an embodiment of the present application;

[0034] Figure 3A control schematic diagram of a connecting valve provided in one embodiment of the present application;

[0035] Figure 4 A schematic diagram of the structure of a sampling module provided in one embodiment of the present application;

[0036] Figure 5 A connection diagram of a connecting valve provided in one embodiment of the present application;

[0037] Figure 6 A schematic diagram of the specific structure of a connecting valve provided in one embodiment of the present application;

[0038] Figure 7 A schematic diagram of the working principle of a connecting valve provided in one embodiment of the present application.

[0039] 101. Battery cluster; 102. Cooling device; 103. Power pump; 104. Liquid inlet pipeline; 105. Primary shunt pipeline; 106. Liquid inlet; 107. Connecting valve; 108. Monitoring module; 109. Liquid outlet pipeline; 110. Liquid outlet; 111. Secondary shunt pipeline.

[0040] The above drawings have shown clear embodiments of the present application, which will be described in more detail later. These drawings and text descriptions are not intended to limit the scope of the present application in any way, but to illustrate the concept of the present application to those skilled in the art by referring to specific embodiments. DETAILED DESCRIPTION

[0041] Exemplary embodiments will be described in detail herein, examples of which are shown in the accompanying drawings. When the following description refers to the drawings, the same numbers in different drawings represent the same or similar elements unless otherwise indicated. The implementations described in the following exemplary embodiments do not represent all implementations consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application as detailed in the appended claims.

[0042] First, the terms involved in this application are explained:

[0043] Thermal runaway: refers to the phenomenon that under certain conditions, the internal temperature of a battery rises rapidly, leading to a series of self-accelerating chemical reactions, which may eventually cause the battery to catch fire or explode.

[0044] Thermal Propagation: refers to the phenomenon that after a battery cell (battery core) experiences thermal runaway, the high temperature and heat generated are transferred to adjacent battery cells, causing adjacent battery cells to also experience thermal runaway, thereby triggering a chain reaction; this phenomenon is particularly dangerous in battery packs (such as electric vehicle battery packs) because once thermal propagation occurs, the entire battery pack may heat up rapidly, leading to serious safety accidents such as fire or explosion.

[0045] Energy storage batteries are mainly in the form of battery clusters. Each battery cluster contains multiple battery packs, which are composed of multiple battery cells connected in series. The energy density of energy storage batteries is high, which will increase the risk of thermal runaway and heat spread. Therefore, energy storage batteries need to both dissipate heat and suppress thermal runaway to prevent heat spread and chain runaway accidents.

[0046] In the prior art, the heat dissipation structure of the energy storage battery adopts two liquid cooling circuits, one external circuit and one internal circuit. The external circuit is cooled by coolant, and the internal circuit is cooled by immersing the battery pack in refrigerant. The external circuit is used to cool the internal circuit, and the liquid cooling circuit is complex. Secondly, the amount of immersion refrigerant is extremely large. It takes a high-power machine to mobilize the internal circulation. After exceeding the thermal runaway temperature of the battery cell, the refrigerant will burn and cannot protect the safety of the equipment. Therefore, in the prior art, by using two liquid cooling circuits for heat dissipation, there are problems such as complex liquid cooling circuits and high energy consumption; and after the battery cell thermal runaway, the refrigerant medium cannot avoid thermal runaway and is even flammable.

[0047] The present application provides a liquid cooling system for a battery cluster, the battery cluster includes at least one battery pack, and the liquid cooling system includes: a power pump, a liquid inlet pipe, a liquid outlet pipe, and a monitoring module of a primary shunt pipe and a connecting valve arranged in each battery pack; one end of the power pump is connected to one end of the liquid inlet pipe, the other end of the liquid inlet pipe is connected to one end of the primary shunt pipe of each battery pack, the other end of the primary shunt pipe of each battery pack is connected to one end of the liquid outlet pipe, and the other end of the liquid outlet pipe is connected to the other end of the power pump, forming a liquid cooling circuit inside the battery pack; a monitoring module is used to monitor whether there is a temperature abnormality in the battery pack; a connecting valve is arranged on the primary shunt pipe, and is used to disconnect the liquid cooling circuit when the temperature is abnormal, so that the coolant is poured into the battery pack through the connecting valve. The present application solves the heat dissipation problem of the battery cluster through the liquid cooling circuit formed by the power pump, the liquid inlet pipe, the liquid outlet pipe, and the primary shunt pipe, and the heat dissipation circuit is simple; secondly, the connecting valve disconnects the liquid cooling circuit when the monitoring module detects that the temperature of the battery pack is abnormal, so that the coolant is poured into the battery pack to suppress thermal runaway and avoid thermal spread accidents.

[0048] The technical solution of the present application and how the technical solution of the present application solves the above-mentioned technical problems are described in detail below with specific embodiments. The following specific embodiments can be combined with each other, and the same or similar concepts or processes may not be repeated in some embodiments. The embodiments of the present application will be described below in conjunction with the accompanying drawings.

[0049] like Figure 1 As shown, Figure 1 A schematic diagram of the structure of a liquid cooling system for a battery cluster provided in an embodiment of the present application. The battery cluster 101 includes at least one battery pack, and the liquid cooling system includes: a power pump 103, a liquid inlet pipe 104, a liquid outlet pipe 109, and a primary shunt pipe 105 and a monitoring module 108 of a connecting valve 107 arranged in each battery pack; one end of the power pump 103 is connected to one end of the liquid inlet pipe 104, and the other end of the liquid inlet pipe 104 is connected to one end of the primary shunt pipe 105 of each battery pack, and the other end of the primary shunt pipe 105 of each battery pack is connected to one end of the liquid outlet pipe 109, and the other end of the liquid outlet pipe 109 is connected to the other end of the power pump 103, forming a liquid cooling circuit inside the battery pack; the monitoring module 108 is used to monitor whether there is a temperature abnormality in the battery pack; the connecting valve 107 is arranged on the primary shunt pipe 105, and is used to disconnect the liquid cooling circuit when the temperature is abnormal, so that the coolant is poured into the battery pack through the connecting valve 107.

[0050] The present application solves the heat dissipation problem of the battery cluster 101 through a liquid cooling circuit formed by a power pump 103, a liquid inlet pipe 104, a liquid outlet pipe 109, and a primary shunt pipe 105. The liquid cooling circuit is simple and has better heat dissipation capacity. Secondly, the connecting valve 107 disconnects the liquid cooling circuit when the monitoring module 108 detects that the temperature of the battery pack is abnormal, so that the coolant is injected into the battery pack to suppress thermal runaway and avoid heat spread accidents.

[0051] In one embodiment, the connecting valve can be disconnected by controlling the monitoring module, can be disconnected by the main control module of the battery management system, or can be disconnected by manual operation. The specific control of the connecting valve is shown in the following embodiment.

[0052] Optionally, the liquid cooling system further includes a liquid inlet 106 and a liquid outlet 110 , wherein the liquid inlet 106 is an inlet for the coolant to enter the battery pack through the primary shunt pipe 105 , and the liquid outlet 110 is an outlet for the coolant to flow out of the battery pack through the primary shunt pipe 105 .

[0053] Optionally, the coolant is a non-flammable medium to prevent thermal runaway of the battery pack. Flammable liquids cannot suppress thermal runaway and may even cause the accident to escalate.

[0054] In one embodiment, the battery management system is provided with a main control module, which is communicated with the monitoring module 108 and the connecting valve 107 respectively; the monitoring module 108 is used to send an alarm signal representing the temperature abnormality to the main control module when the monitoring data of the battery pack represents that the battery pack has a temperature abnormality; the main control module is used to determine whether to send a control signal to the connecting valve 107 according to the battery pack temperature abnormality represented by the alarm signal.

[0055] Specifically, the main control module can obtain the monitoring data of the monitoring module 108 in real time, and fully understand the operating status of the battery pack. When the monitoring data of the battery pack indicates that the battery pack has abnormal temperature, it can also control the control signal to the connecting valve 107 to control the connecting valve 107 to disconnect so that the coolant can be poured into the battery pack, respond quickly, reduce the risk of accidents, remotely monitor and protect the battery cluster 101, and ensure the safe operation of the battery pack under various working conditions. Secondly, the main control module selectively sends control signals according to the monitoring data of the battery pack, because once the coolant is poured into the battery pack, it cannot be withdrawn. In order to avoid misjudgment, the main control module can also comprehensively consider the monitoring data of the battery pack to determine whether to send a control signal.

[0056] Optionally, the main control module can also obtain the location of the abnormal battery pack, cut off the power supply to the abnormal battery pack, and promptly suppress thermal runaway of the battery pack.

[0057] Optionally, the number of monitoring modules 108 corresponds to the number of battery packs in the battery cluster 101. The monitoring modules 108 can monitor abnormal conditions inside the battery packs in real time, that is, abnormal temperature of the battery packs, and send monitoring data of each battery pack to the main control module.

[0058] In one embodiment, if Figure 2 As shown, Figure 2 A schematic diagram of a monitoring module 108 provided in an embodiment of the present application. The monitoring data includes at least one of electrolyte gas detection data, combustion characteristic gas detection data, smoke detection data, photosensitive detection data and temperature detection data.

[0059] Specifically, the monitoring module 108 includes at least one of a gas detector, a smoke detector, a photosensitive sensor, and a temperature sensor. The gas detector is used to detect the electrolyte gas (VOC) detection data and the combustion characteristic gas (CO) detection data in the battery pack; the smoke detector is used to detect the smoke detection data in the battery pack; the photosensitive sensor is used to detect the photosensitive detection data in the battery pack. When the battery pack is in thermal runaway, there will be an open flame, so the photosensitive sensor can be used to directly determine whether the battery pack is in thermal runaway; the temperature sensor can be used to detect the temperature detection data in the battery pack. During the thermal runaway of the battery cell, smoke, CO, and H2 will be generated. In addition, the electrolyte flows out of the battery cell and is accompanied by high temperature of the battery cell. Therefore, it is possible to determine whether the battery pack is in thermal runaway through the electrolyte gas detection data, combustion characteristic gas detection data, smoke detection data, photosensitive detection data, and temperature detection data in the battery pack, thereby solving the problem of thermal runaway in a targeted manner and avoiding heat spread.

[0060] Alternatively, if Figure 3 As shown, Figure 3 This is a control schematic diagram of the connecting valve 107 provided in one embodiment of the present application. The monitoring module 108 is connected to the main control module via the CAN interface. When the monitoring module 108 detects that one of the monitoring data in the battery pack is abnormal, it sends a first-level alarm signal to the main control module; when the monitoring module 108 detects that multiple monitoring data of the battery pack are abnormal, it sends a second-level alarm signal to the main control module; when the monitoring module 108 detects that the battery pack is on fire, it sends a third-level alarm signal to the main control module. When the main control module receives a first-level alarm signal or a second-level alarm signal, the main control module can choose to output a control signal to the connecting valve 107, and the control signal is used to control the connecting valve 107 to disconnect, so that the coolant can be poured into the abnormal battery pack.

[0061] Optionally, the monitoring module 108 can also set different levels of alarm signals according to the different states of the battery pack to achieve a step-by-step solution to the heat dissipation problem of the battery pack and avoid thermal runaway. The three-level alarm set in this application is just one example. Optionally, when the monitoring data exceeds the alarm value, it is considered that the monitoring data is abnormal. The setting of the alarm value can be determined according to the actual situation, and this application does not limit it.

[0062] Optionally, the installation position of the monitoring module 108 in the battery pack is not limited as long as it does not affect the communication function and control function of the monitoring module 108 .

[0063] In one embodiment, the main control module is further used to output an alarm signal and / or record an alarm signal.

[0064] Specifically, upon receiving an alarm signal, the main control module may choose to output the alarm signal and / or record the alarm signal. The main control module may output the alarm signal by lighting a light, alarming, causing a fault, starting an indicator light, etc., to remind the staff to take measures in response to the alarm signal.

[0065] In one of the embodiments, the monitoring module 108 is also connected to the connecting valve 107 for communication; the monitoring module 108 is also used to send a control signal to the connecting valve 107 when the monitoring data of the battery pack indicates that the temperature of the battery pack is abnormal and there is a risk of thermal runaway.

[0066] Specifically, when the monitoring module 108 detects that the battery pack has a risk of thermal runaway, it directly sends a control signal to the connecting valve 107 to control the connecting valve 107 to disconnect, so that the coolant can be poured into the battery pack to suppress thermal runaway and avoid heat spread that causes property loss and safety problems. Please refer to 3. When the monitoring module 108 detects that the battery pack is on fire, it sends a level 3 alarm signal to the main control module, but the monitoring module 108 directly sends a control signal to the connecting valve 107 to control the connecting valve 107 to disconnect, which responds quickly.

[0067] In one embodiment, if Figure 4 As shown, Figure 4 The liquid cooling system further comprises a sampling module, and the monitoring module 108 is connected to the main control module through the sampling module; the monitoring module 108 is used to send monitoring data to the sampling device.

[0068] The sampling module is used to collect the cell voltage signal and temperature signal in the battery pack, and send the cell voltage signal, temperature signal and monitoring data to the main control module.

[0069] Optionally, the sampling module includes a communication interface, a main sampling line, a monitoring signal line, a battery voltage sampling line, and a battery temperature sampling line, wherein the sampling module is connected to the main control module via the main sampling line, and is connected to the monitoring module 108 via the monitoring signal line, and is used to obtain the monitoring data of the monitoring module 108; the battery voltage sampling line is used to obtain the cell voltage signal of the battery pack; and the battery temperature sampling line is used to obtain the temperature signal of the battery pack. The main control module can obtain the information of multiple battery packs in real time through the sampling module, accurately determine the location of abnormal battery packs, and achieve the effect of remote monitoring and maintenance.

[0070] In one embodiment, the connecting valve 107 is further used to disconnect the liquid cooling circuit upon receiving an external control signal.

[0071] Specifically, Figure 5 As shown, Figure 5A connection diagram of the connecting valve 107 provided in an embodiment of the present application. The connecting valve 107 controls the locking and loosening of the two sections of the cooling pipe. When the connecting valve 107 is locked, the primary shunt pipe 105 forms a loop in the battery pack. The main control module connects the connecting valve 107 and the monitoring module 108, and the monitoring module 108 is connected to the connecting valve 107. Both the main control module and the monitoring module 108 can control the connecting valve 107 to disconnect the liquid cooling loop and control the cooling liquid to be poured into the battery pack.

[0072] In one embodiment, the connecting valve 107 includes a control center, a telescopic clamping column, and a switch structure; the switch structure includes: a fixed joint and a retaining spring; the first-level diversion pipeline 105 includes two sections of cold pipes; the fixed joint is used to connect the two sections of cold pipes, and the retaining spring has a slot, and the slot and the telescopic clamping column structure lock the fixed joint to connect the two sections of cold pipes; the control center includes a control unit, and a accommodating cavity for accommodating the telescopic clamping column; the control unit is used to control the telescopic clamping column to retract when receiving a control command, so that the slot is separated from the fixed joint and the two sections of cold pipes are disconnected.

[0073] Specifically, Figure 6 As shown, Figure 6 A schematic diagram of the specific structure of the connecting valve 107 provided in an embodiment of the present application. When the monitoring module 108 detects that the battery pack has thermal runaway, it outputs an alarm signal to the main control module, which can accurately lock the position of the abnormal battery pack and cut off the power to the abnormal battery pack. At the same time, it outputs a control signal to the control center of the connecting valve 107, and the control unit outputs a cut-off signal. The telescopic clamping column will retract after responding, so that the snap-open buckle, that is, the clamping slot, will be separated from the fixed joint. The liquid cooling pressure of the coolant will directly open the cold pipe joint, and the coolant will enter the battery pack to prevent the battery pack from thermal runaway and ignition, explosion and other harmful phenomena. Secondly, when the monitoring module 108 detects a third-level alarm signal, that is, a fire occurs in the battery pack, it will directly send a control signal to the control center of the connecting valve 107. The control center will output a cut-off signal based on the control unit. The telescopic card column will retract in response, causing the pop-up buckle, i.e., the card slot, to detach from the fixed joint. The liquid cooling pressure of the coolant will directly flush open the cold pipe joint, and the coolant will enter the battery pack to prevent the battery pack from thermal runaway and causing ignition, explosion, and other hazardous phenomena.

[0074] In one of the embodiments, the connecting valve can be disconnected by manual control. By controlling the retractable clamping column to retract, the pop-up buckle, i.e., the clamping slot, is separated from the fixed joint. The liquid cooling pressure of the coolant will directly flush open the cold pipe joint, and the coolant will enter the battery pack to prevent the battery pack from thermal runaway and causing harmful phenomena such as ignition and explosion.

[0075] Specifically, a button is set on the outside of the battery pack, and the button is connected to the control center of the connecting valve. The control signal is directly sent to the control center of the connecting valve 107 through the button operation. The control center outputs a cut-off signal according to the control unit. The telescopic card column will retract after response, so that the pop-up buckle, that is, the card slot, will be separated from the fixed joint. The liquid cooling pressure of the coolant will directly flush the cold pipe joint, and the coolant will enter the battery pack to prevent the battery pack from thermal runaway and causing ignition, explosion and other harmful phenomena.

[0076] like Figure 7 As shown, Figure 7 The schematic diagram of the working principle of the connecting valve 107 provided in one embodiment of the present application. The main control module is connected to the connecting valve 107 through a communication interface, and the monitoring module 108 is connected to the connecting valve 107 through a communication interface. After the control center of the connecting valve 107 receives the control signal, the control unit outputs a cut-off signal, and the telescopic clamping column retracts after responding, so that the spring-opening buckle, i.e., the clamping slot, is separated from the fixed joint, and the liquid cooling pressure of the coolant directly flushes the cold pipe joint, and the coolant enters the battery pack to prevent the battery pack from thermal runaway and ignition, explosion and other harmful phenomena.

[0077] In one embodiment, the battery pack includes at least one battery module, and the liquid cooling system also includes at least one secondary shunt pipe 111 arranged in the battery pack; the secondary shunt pipe 111 is connected to the primary shunt pipe 105, serving as a lower-level shunt pipe of the primary shunt pipe, wherein one secondary shunt pipe 111 corresponds to one battery module, forming a liquid cooling circuit of the battery module for cooling the battery module.

[0078] See also Figure 1 The present application realizes multi-stage cooling by setting up two-stage shunt pipes. The first-stage shunt pipe 105 shunts the flow to multiple battery packs in the battery cluster 101, and the second-stage shunt pipe 111 shunts the flow to a single module in the battery pack, thereby realizing module-level cooling, ensuring the normal operation of the battery cluster 101, and suppressing the risk of thermal runaway.

[0079] In one embodiment, if Figure 1 As shown, the cooling device 102 is arranged outside the battery pack and in the passage between the power pump 103, the liquid inlet pipe 104 and the liquid outlet pipe 109, and is used to adjust the temperature of the coolant.

[0080] In one embodiment, the cooling device 102 is a liquid cooling system.

[0081] Specifically, the cooling device 102 can reuse a device outside the liquid cooling system, or can be an internal device of the liquid cooling system. The cooling device 102 is an air conditioner or a cooling tower. Among them, the air conditioner is an external device of the liquid cooling system, and the cooling tower is an internal device of the liquid cooling system.

[0082] An embodiment of the present application provides a battery management system, including a main control module and any of the above-mentioned liquid cooling systems.

[0083] The battery management system solves the heat dissipation problem of the battery cluster 101 through the liquid cooling circuit of the liquid cooling system. The liquid cooling circuit is simple and has better heat dissipation capacity. Secondly, when the monitoring module 108 detects that the temperature of the battery pack is abnormal, the main control module disconnects the liquid cooling circuit, so that the coolant is poured into the battery pack to suppress thermal runaway and avoid heat spread accidents. It can also determine the location of the abnormal battery pack and disconnect the power supply of the abnormal battery pack in time.

[0084] The embodiment of the present application provides an electric device, including at least one battery cluster 101 and the above-mentioned battery management system.

[0085] Electrical equipment may be electric vehicles, hybrid vehicles, renewable energy systems and large communication facilities.

[0086] The division of units is only a logical function division, and there may be other divisions in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interface, device or unit, which can be electrical, mechanical or other forms.

[0087] The units described as separate components may or may not be physically separated, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed on multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0088] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0089] If the function is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention, or the part that contributes to the prior art, or the part of the technical solution, can be embodied in the form of a software product. The computer software product is stored in a storage medium, including several instructions for a computer device (which can be a personal computer, server, or network device, etc.) to perform all or part of the steps of the methods of each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc. Various media that can store program codes.

[0090] Those skilled in the art can understand that all or part of the steps of implementing the above-mentioned method embodiments can be completed by hardware related to program instructions. The aforementioned program can be stored in a computer-readable storage medium. When the program is executed, the steps of the above-mentioned method embodiments are executed; and the aforementioned storage medium includes: ROM, RAM, disk or optical disk and other media that can store program codes.

[0091] Finally, it should be noted that those skilled in the art will readily conceive of other embodiments of the present invention after considering the specification and practicing the invention disclosed herein. The present invention is intended to cover any variations, uses or adaptations of the present invention, which follow the general principles of the present invention and include common knowledge or customary technical means in the art not disclosed by the present invention, are not limited to the precise structure described above and shown in the drawings, and may be modified and changed in various ways without departing from the scope thereof. The scope of the present invention is limited only by the appended claims.

Claims

1. A liquid cooling system for a battery cluster, characterized in that: The battery cluster (101) includes at least one battery pack, and the liquid cooling system includes: a power pump (103), a liquid inlet pipe (104), a liquid outlet pipe (110), and a monitoring module (108) of a primary flow distribution pipe (105) and a communication valve (107) arranged in each of the battery packs; One end of the power pump (103) is connected to one end of the liquid inlet pipe (104), the other end of the liquid inlet pipe (104) is connected to one end of the primary shunt pipe (105) of each battery pack, the other end of the primary shunt pipe (105) of each battery pack is connected to one end of the liquid outlet pipe (110), and the other end of the liquid outlet pipe (110) is connected to the other end of the power pump (103), thereby forming a liquid cooling circuit inside the battery pack; The monitoring module (108) is used to monitor whether there is a temperature abnormality in the battery pack; The connecting valve (107) is arranged on the primary flow diversion pipeline (105) and is used to disconnect the liquid cooling circuit when the temperature is abnormal, so that the cooling liquid is poured into the battery pack through the connecting valve (107).

2. The liquid cooling system according to claim 1, characterized in that: The battery management system is provided with a main control module, and the main control module is respectively connected to the monitoring module (108) and the communication valve (107) for communication; The monitoring module (108) is used to send an alarm signal indicating the temperature abnormality to the main control module when the monitoring data of the battery pack indicates that the battery pack has a temperature abnormality; The main control module is used to determine whether to send a control signal to the communication valve (107) according to the abnormal temperature of the battery pack represented by the alarm signal.

3. The liquid cooling system according to claim 2, characterized in that: The main control module is also used to output the alarm signal and / or record the alarm signal.

4. The liquid cooling system according to claim 2, characterized in that: The monitoring module (108) is also in communication connection with the communication valve (107); The monitoring module (108) is further configured to send the control signal to the connecting valve (107) when the monitoring data of the battery pack indicates that the temperature of the battery pack is abnormal and there is a risk of thermal runaway.

5. The liquid cooling system according to claim 1, characterized in that: The monitoring data includes at least one of electrolyte gas detection data, combustion characteristic gas detection data, smoke detection data, photosensitivity detection data and temperature detection data.

6. The liquid cooling system according to claim 2, characterized in that: The liquid cooling system further comprises a sampling module, and the monitoring module (108) is communicatively connected with the main control module via the sampling module; The monitoring module (108) is used to send the monitoring data to the sampling device; The sampling module is used to collect the cell voltage signal and temperature signal in the battery pack, and send the cell voltage signal, temperature signal and the monitoring data to the main control module.

7. The liquid cooling system according to claim 1, characterized in that: The connecting valve (107) is also used to disconnect the liquid cooling circuit when receiving an external control signal.

8. The liquid cooling system according to any one of claims 1 to 7, characterized in that: The communication valve (107) comprises a control center, a telescopic clamping column, and a switch structure; The switch structure comprises: a fixed joint and a clamping spring; the primary flow diversion pipeline (105) comprises two sections of cold pipes; the fixed joint is used to connect the two sections of the cold pipes, the clamping spring has a clamping groove, and the clamping groove and the telescopic clamping column structure lock the fixed joint to connect the two sections of the cold pipes; The control center includes a control unit and a receiving cavity for receiving the telescopic card column; The control unit is used to control the retracting of the telescopic clamping column when receiving a control instruction, so that the clamping slot is separated from the fixed joint and the two sections of the cold pipe are disconnected.

9. The liquid cooling system according to any one of claims 1 to 7, characterized in that: The battery pack comprises at least one battery module, and the liquid cooling system further comprises at least one secondary shunt pipe (111) arranged in the battery pack; The secondary shunt pipe (111) is connected to the primary shunt pipe (105) and serves as a lower-level shunt pipe of the primary shunt pipe, wherein one secondary shunt pipe (111) corresponds to one battery module, forming a liquid cooling circuit of the battery module for cooling the battery module.

10. The liquid cooling system according to any one of claims 1 to 7, characterized in that: The cooling device (102) is arranged outside the battery pack and on the passage between the power pump (103), the liquid inlet pipe (104) and the liquid outlet pipe (110), and is used to adjust the temperature of the coolant.

11. The liquid cooling system according to claim 10, characterized in that: The cooling device (102) belongs to the liquid cooling system.

12. A battery management system, characterized in that: It comprises a main control module and a liquid cooling system as claimed in any one of claims 1 to 11.

13. An electrical equipment, characterized in that: The invention comprises at least one battery cluster and the battery management system as claimed in claim 12.

Images