Battery explosion-proof monitoring device and battery pack

Abstract

The utility model relates to a battery explosion-proof monitoring device and a battery pack, a valve body assembly in the device is arranged at a mounting port, the valve body assembly comprises a valve body and a control module, and the control module is arranged in the valve body; the acquisition assembly is arranged in the battery pack and is connected with the control module; the control module is configured to drive opening and closing of the valve body so as to control the on-off state between the containing cavity and the external environment, and anti-explosion monitoring of the battery pack is achieved. According to the application, the valve body assembly is arranged at the mounting port of the battery box body, and the acquisition assembly is arranged at the battery pack, so that the acquisition assembly transmits the acquired acquisition signal to the control module of the valve body assembly, and the control module drives the valve body to open and close according to the acquisition signal, so that the on-off state control between the accommodating cavity and the external environment is realized; and corresponding actions are performed in response to the change in the battery pack in time, so that the explosion-proof reaction speed is increased, and the risk of thermal runaway of the battery is reduced by accurately controlling the valve opening action of the valve body.

Description

Technical Field

[0001] The present application relates to the field of battery technology, and in particular to a battery explosion-proof monitoring device and a battery pack. Background Art

[0002] The explosion-proof valve, also known as the pressure protection valve, is a device used to protect the safety of batteries. During the use of the battery, due to overcharging, over-discharging, short circuit and other reasons, excessive gas may be generated inside the battery, leading to serious consequences such as thermal runaway, explosion, and fire. The explosion-proof valve has the functions of controlling gas pressure, relieving overcharging pressure, and preventing accidents caused by external force squeezing. It is one of the important devices to ensure battery safety. In addition, the immersion cooling system can also reduce or avoid the hazards caused by thermal runaway of the battery cells in the battery pack.

[0003] In the prior art, the parameters of the battery cells are preset, and when the parameters reach the preset values, the explosion-proof valves of the battery cells where thermal runaway has occurred are opened to reduce or prevent the occurrence of thermal runaway. However, the explosion-proof reaction speed of the existing explosion-proof valves is slow, and there is a risk of delay and misjudgment, and it is easy to mistakenly open the valves for healthy battery cells, causing unnecessary losses. Utility Model Content

[0004] Based on this, it is necessary to provide a battery explosion-proof monitoring device and battery pack that can improve the explosion-proof reaction speed, accurately control the opening action of the explosion-proof valve, and reduce the risk of thermal runaway of the battery in response to the problems existing in the above-mentioned existing battery explosion-proof valves.

[0005] In a first aspect, the present application provides a battery explosion-proof monitoring device, which is applied to a battery pack, wherein the battery pack includes a battery pack and a battery box, wherein the battery box is provided with a receiving cavity and a mounting opening, and the battery pack is arranged in the receiving cavity; the battery explosion-proof monitoring device includes:

[0006] A valve body assembly, the valve body assembly is arranged at the installation port, the valve body assembly comprises a valve body and a control module, and the control module is arranged on the valve body;

[0007] The collection component is arranged on the battery pack and connected to the control module; the control module is configured to drive the opening and closing of the valve body to control the on-off state between the accommodating chamber and the external environment.

[0008] In one embodiment, the control module includes a drive member and a processing unit;

[0009] The driving member is connected to the valve body, and the processing unit is respectively connected to the driving member and the collection component;

[0010] The processing unit is configured to drive the driving member to control the opening and closing of the valve body.

[0011] In one embodiment, the valve body is provided with a pressure relief channel, and a cover body is provided at a first end of the pressure relief channel;

[0012] The cover body is configured to adjust the opening and closing state of the pressure relief channel based on the driving member.

[0013] In one embodiment, a transmission rod is disposed in the pressure relief channel, a first end of the transmission rod is disposed adjacent to the cover body, and a second end of the transmission rod is connected to the driving member;

[0014] The transmission rod is configured to close, partially open or fully open the cover body based on the drive member.

[0015] In one embodiment, an interface module is provided at the second end of the transmission rod, a first end of the interface module is connected to the processing unit, a second end of the interface module is connected to the acquisition component, and a third end of the interface module is connected to the driving member.

[0016] In one embodiment, the control module further includes a first housing, which is detachably disposed at the second end of the pressure relief channel;

[0017] The driving member is installed in the first shell.

[0018] In one embodiment, the control module further includes a second housing, which is detachably disposed on the first housing;

[0019] The processing unit is installed in the second shell.

[0020] In one embodiment, the battery pack includes a plurality of single cells, and the acquisition component includes a plurality of acquisition chips;

[0021] The single cell is provided with at least one acquisition chip, and each acquisition chip is connected to the control module.

[0022] In one embodiment, the processing unit includes a processor and a pressure sensor; the pressure sensor is connected to the processor, and the processor is respectively connected to the driving member and the acquisition component.

[0023] In a second aspect, the present application provides a battery pack, including a battery pack, a battery box, and a battery explosion-proof monitoring device as described above;

[0024] The battery pack and the battery explosion-proof monitoring device are respectively arranged in the battery box.

[0025] In one embodiment, an immersion liquid is provided in the battery box, the battery pack includes a plurality of single cells, an explosion-proof valve is provided on the first side of the single cell, and the immersion liquid is used to immerse the explosion-proof valve of each single cell.

[0026] In one embodiment, the immersion liquid immerses the explosion-proof valve of the single battery cell by a distance ranging from 10 to 20 mm.

[0027] One of the above technical solutions has the following advantages and beneficial effects:

[0028] The above-mentioned battery explosion-proof monitoring device is applied to a battery pack, which includes a battery pack and a battery case. The battery case is provided with a accommodating cavity and an installation port, and the battery pack is arranged in the accommodating cavity; the battery explosion-proof monitoring device includes a valve body assembly and a collection assembly, the valve body assembly is arranged at the installation port, the valve body assembly includes a valve body and a control module, and the control module is arranged on the valve body; the collection assembly is arranged on the battery pack, and the collection assembly is connected to the control module; the control module is configured to drive the opening and closing of the valve body to control the on-off state between the accommodating cavity and the external environment, so as to realize explosion-proof monitoring of the battery pack. The present application arranges a valve body assembly at the installation port of the battery case and arranges a collection assembly in the battery pack, and then the collection assembly transmits the collected signal to the control module of the valve body assembly. The control module drives the opening and closing of the valve body according to the collection signal, thereby realizing the on-off state control of the accommodating cavity and the external environment, and promptly responds to the changes inside the battery pack to make corresponding actions, such as by closing the explosion-proof valve, making the battery pack a closed space, and by opening the valve body, connecting the battery pack with the external atmosphere, quickly balancing the pressure difference between the inside and outside of the box caused by thermal runaway of the battery pack, and quickly discharging the gas produced by the thermal runaway of the battery pack, thereby improving the explosion-proof reaction speed, and reducing the risk of thermal runaway of the battery by accurately controlling the valve opening action of the valve body. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the first circuit structure of the battery explosion-proof monitoring device in an embodiment of the present application;

[0030] Figure 2 This is a schematic diagram of the second circuit structure of the battery explosion-proof monitoring device in an embodiment of the present application;

[0031] Figure 3 This is a schematic diagram of the third circuit structure of the battery explosion-proof monitoring device in the embodiment of the present application;

[0032] Figure 4 This is a schematic diagram of the structure of a battery explosion-proof monitoring device in an embodiment of the present application;

[0033] Figure 5 This is a schematic diagram of the exploded structure of the battery explosion-proof monitoring device in the embodiment of the present application from a first perspective;

[0034] Figure 6 This is a schematic diagram of the exploded structure of the battery explosion-proof monitoring device in the embodiment of the present application from a second perspective;

[0035] Figure 7 This is a schematic diagram of the cross-sectional structure of a battery explosion-proof monitoring device in an embodiment of the present application;

[0036] Figure 8This is a schematic diagram of the structure of a battery pack from a first perspective in an embodiment of the present application;

[0037] Fig. 9 A schematic diagram of the structure of the battery pack from a second viewing angle in an embodiment of the present application;

[0038] Fig.10 for Fig. 9 Schematic diagram of the enlarged structure at point A in the middle.

[0039] Reference numerals:

[0040] 100, battery pack; 110, single cell; 200, battery case; 300, battery explosion-proof monitoring device; 310, valve body assembly; 320, valve body; 322, pressure relief channel; 324, cover body; 326, transmission rod; 328, interface module; 330, control module; 332, drive member; 334, processing unit; 336, processor; 338, pressure sensor; 342, first shell; 344, second shell; 350, acquisition assembly; 352, acquisition chip. DETAILED DESCRIPTION

[0041] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present application.

[0042] It should be noted that the terms "first", "second", etc. in the specification and claims of the present application and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the data used in this way can be interchanged where appropriate, so that the embodiments of the present application described here. In addition, the terms "including" and "having" and any of their variations are intended to cover inclusions that are not listed. For example, a process, method, system, product or device that includes a series of steps or units is not necessarily limited to those steps or units that are clearly listed, but may include other steps or units that are not clearly listed or inherent to these processes, methods, products or devices.

[0043] In the present application, the terms "upper", "lower", "left", "right", "front", "back", "top", "bottom", "inner", "outer", "middle", "vertical", "horizontal", "lateral", "longitudinal" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the drawings. These terms are mainly used to better describe the present application and its embodiments, and are not used to limit the indicated devices, elements or components to have a specific orientation, or to be constructed and operated in a specific orientation.

[0044] In addition, some of the above terms may be used to express other meanings in addition to indicating orientation or positional relationship. For example, the term "on" may also be used to express a certain dependency or connection relationship in some cases. For those of ordinary skill in the art, the specific meanings of these terms in this application can be understood according to specific circumstances.

[0045] In addition, the term "plurality" shall mean two or more.

[0046] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present application can be combined with each other. The present application will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0047] In one embodiment, Figure 1 and Figure 8 As shown, a battery explosion-proof monitoring device is provided, which is applied to a battery pack. The battery pack includes a battery group 100 and a battery box 200. The battery box 200 is provided with a receiving cavity and a mounting port, and the battery group 100 is arranged in the receiving cavity; the battery explosion-proof monitoring device 300 includes a valve body assembly 310 and a collection assembly 350; the valve body assembly 310 is arranged at the mounting port, the valve body assembly 310 includes a valve body 320 and a control module 330, and the control module 330 is arranged on the valve body 320; the collection assembly 350 is arranged on the battery pack 100, and the collection assembly 350 is connected to the control module 330; the control module 330 is configured to drive the opening and closing of the valve body 320 to control the on-off state between the receiving cavity and the external environment.

[0048] Among them, the shape of the battery pack can be a regular shape or an irregular shape, for example, the battery pack can be a square battery pack. The battery pack includes a battery case 200, and the battery case 200 can be a case made of metal, non-metal or composite materials. The battery case 200 is provided with a receiving cavity, which is used to receive the battery pack 100. The battery case 200 is also provided with an installation port, which is used to install and set the valve body assembly 310. When the valve body assembly 310 is turned on, the receiving cavity is connected to the external environment; when the valve body assembly 310 is closed, the receiving cavity forms a closed space. When the valve body 320 is in a semi-open state, the interior of the receiving cavity of the battery case 200 can be connected to the external atmosphere, but the water vapor and other debris outside the battery case 200 cannot enter the battery case 200 through the valve body assembly 310, which plays a role in balancing the air pressure inside and outside the battery case 200, while avoiding contamination of the battery pack 100 in the battery case 200. The battery pack 100 may include a plurality of single cells 110, each of which is connected in series and / or in parallel. The single cells 110 may be lithium cells.

[0049] The mounting port may be provided on the top surface of the battery case 200. For example, the battery case 200 is a square case, and an immersion liquid is injected into the battery case 200. The immersion liquid is used to cool and dissipate heat from the battery pack 100. The top surface of the battery case 200 is provided with a mounting port. By providing the valve body assembly 310 at the mounting port, the opening and closing state of the accommodating cavity can be controlled based on the on-off state of the valve body assembly 310, and at the same time, the immersion liquid leakage is avoided when the valve body assembly 310 is turned on. For another example, the battery case 200 is a square case, and there is no immersion liquid in the battery case 200. The top surface or side surface of the battery case 200 may be provided with a mounting port. By providing the valve body assembly 310 at the mounting port, the on-off state between the accommodating cavity and the external environment can be controlled based on the on-off state of the valve body assembly 310.

[0050] The collection component 350 can be set on one side of the battery pack 100 by bonding, clamping or screwing. For example, the collection component 350 can be set on the top surface of the battery pack 100. The collection component 350 can be used to collect the electrical signal and / or temperature signal of any single cell 110 of the battery pack 100, and then obtain the collection signal. Based on the connection of the collection component 350 to the control module 330, the collection component 350 can transmit the collected collection signal to the control module 330. Exemplarily, the battery explosion-proof monitoring device 300 also includes a first wiring harness, which is electrically connected between the control module 330 and the collection component 350 to realize the power supply of the control module 330 to the collection component 350, and the signal transmission of the collection component 350 to the control module 330.

[0051] The valve body assembly 310 may include a valve body 320, which may be arranged at the installation opening of the battery case 200 by screwing or clamping, and the valve body 320 and the installation opening of the battery case 200 are sealed. For example, in order to enhance the sealing between the valve body 320 and the installation opening of the battery case 200, a sealing ring may be arranged between the valve body 320 and the installation opening of the battery case 200. It should be noted that the sealing ring may be a silicone ring.

[0052] The valve body assembly 310 also includes a control module 330, which can be set on the valve body 320 by screwing, clamping, bonding or welding. The control module 330 can be used to receive the collection signal collected by the collection assembly 350, and drive the channel of the valve body 320 according to the collection signal, so as to control the opening and closing of the accommodating chamber of the battery box 200. Exemplarily, the working state of the battery pack 100 is set to be a static state, a charging and discharging state, and an out-of-control state. According to the collection signal, when the working state of the battery pack 100 is a static state, the air pressure in the accommodating chamber of the battery box 200 is consistent with the external air pressure, and there is no need to open the valve body 320, so the valve body 320 is closed or maintained closed, so that the accommodating chamber of the battery box 200 forms a closed space. When the battery pack 100 is in the charging and discharging state, the temperature generated by the battery pack 100 will cause the storage cavity of the battery case 200 to expand, resulting in a change in air pressure. The valve body 320 can be partially opened to allow the interior of the storage cavity of the battery case 200 to communicate with the external atmosphere, so that the air pressure in the storage cavity of the battery case 200 is balanced with the external air, and water vapor and other debris outside the battery case 200 cannot enter the storage cavity through the valve body 320, thereby avoiding contamination of the battery pack 100 in the battery case 200. When the working state of the battery pack 100 is out of control, that is, when any single cell 110 of the battery pack 100 has thermal runaway, the temperature and air pressure of the battery pack 100 change dramatically, resulting in drastic changes in the temperature and air pressure in the accommodating chamber of the battery box 200. By fully opening the valve body 320, the inside of the accommodating chamber of the battery box 200 is in direct contact with the external atmosphere, and the air pressure difference between the inside and outside of the box caused by the thermal runaway of the battery pack 100 is quickly balanced, and the gas produced by the thermal runaway of the battery pack 100 can be quickly discharged. It should be noted that the static state of the battery pack 100 is that the battery pack 100 and the air pressure in the battery box 200 are in a normal state; the out of control state of the battery pack 100 is the state in which the battery pack 100 has thermal runaway.

[0053] In the above-mentioned embodiment, the valve body assembly 310 is arranged at the installation port of the battery box 200, and the valve body assembly 310 includes a valve body 320 and a control module 330, and the control module 330 is arranged on the valve body 320; the collection assembly 350 is arranged on the battery pack 100, and the collection assembly 350 is connected to the control module 330; the control module 330 is configured to drive the opening and closing of the valve body 320 to control the on-off state between the accommodating cavity and the external environment, so as to realize explosion-proof monitoring of the battery pack. The present application sets a valve body assembly 310 at the installation port of the battery case 200 and sets a collection assembly 350 at the battery pack 100, and then the collection assembly 350 transmits the collected signal to the control module 330 of the valve body assembly 310. The control module 330 drives the opening and closing of the valve body 320 according to the collected signal to realize the connection control between the accommodating cavity and the external environment, and promptly responds to the changes inside the battery pack to make corresponding actions, such as closing the explosion-proof valve to make the battery pack a closed space, and opening the valve body 320 to connect the battery pack with the external atmosphere, quickly balancing the pressure difference between the inside and outside of the box caused by thermal runaway of the battery pack 100, and can quickly discharge the gas produced by the thermal runaway of the battery pack 100, thereby improving the explosion-proof reaction speed, and reducing the risk of thermal runaway of the battery by accurately controlling the valve opening action of the valve body 320.

[0054] In one embodiment, Figure 2 As shown, the control module 330 includes a driving member 332 and a processing unit 334 ; the driving member 332 is connected to the valve body 320 , and the processing unit 334 is respectively connected to the driving member 332 and the collection component 350 ; the processing unit 334 is configured to drive the driving member 332 to control the opening and closing of the valve body 320 .

[0055] Among them, the driving member 332 can be used to control the opening and closing state of the valve body 320. For example, the driving member 332 can be a motor, and the opening and closing state of the valve body 320 is controlled by the motor. Exemplarily, when the motor rotates the first preset number of circles, the control valve body 320 is in a partially open state, so that the inside of the accommodating cavity of the battery box 200 can be connected to the external atmosphere, and at the same time, the water vapor and other debris outside the battery box 200 cannot enter the accommodating cavity through the valve body 320; when the motor rotates the second preset number of circles, the control valve body 320 is in a fully open state, so that the inside of the accommodating cavity of the battery box 200 is completely connected to the outside, so as to quickly discharge the gas produced by the battery pack 100 due to thermal runaway and balance the pressure difference between the inside and outside of the battery box 200.

[0056] The driving member 332 may be arranged on the valve body 320 by means of snap connection, screw connection or bonding, and the processing unit 334 may be arranged on the valve body 320 by means of snap connection, screw connection or bonding. For example, the first end of the valve body 320 is located outside the accommodating cavity, the second end of the valve body 320 is located inside the accommodating cavity, and the driving member 332 and the processing unit 334 may be arranged adjacent to the second end of the valve body 320. Exemplarily, the driving member 332 is arranged between the second end of the valve body 320 and the processing unit 334, so that the processing unit 334 can be connected to the collection assembly 350, and the driving member 332 can control the opening and closing of the valve body 320.

[0057] Exemplarily, based on the processing unit 334, the driving member 332 and the collection component 350 are respectively connected, the collection component 350 collects data on the battery pack 100, obtains a collection signal, and transmits the collection signal to the processing unit 334; the processing unit 334 receives the collection signal collected by the collection component 350, and according to the collection signal, when the working state of the battery pack 100 is a static state, the air pressure in the accommodating cavity of the battery box 200 is consistent with the external air pressure, and there is no need to open the valve body 320. Therefore, the processing unit 334 drives the driving member 332 to rotate in the opposite direction for a preset number of circles or does not drive the driving member 332 to work, and then closes or maintains the closed valve body 320, so that the accommodating cavity of the battery box 200 forms a closed space. When the battery pack 100 is in the charging and discharging state, the temperature generated by the battery pack 100 will cause the storage cavity of the battery case 200 to expand, resulting in a change in air pressure. Therefore, the processing unit 334 drives the driving member 332 to rotate in the positive direction for the first preset number of circles, so that the valve body 320 is in a partially open state. The interior of the storage cavity of the battery case 200 can be connected to the external atmosphere, so that the air pressure in the storage cavity of the battery case 200 is balanced with the external air, and water vapor and other debris outside the battery case 200 cannot enter the storage cavity through the valve body 320, thereby avoiding contamination of the battery pack 100 in the battery case 200. When the working state of the battery pack 100 is out of control, that is, when any single cell 110 of the battery pack 100 has thermal runaway, the temperature and air pressure of the battery pack 100 change dramatically, resulting in drastic changes in the temperature and air pressure in the accommodating cavity of the battery case 200. Therefore, the processing unit 334 drives the driving member 332 to rotate forward for a second preset number of circles, so that the valve body 320 is in a fully open state. The interior of the accommodating cavity of the battery case 200 is in direct contact with the external atmosphere, and the pressure difference between the inside and outside of the case caused by the thermal runaway of the battery pack 100 is quickly balanced, and the gas generated by the thermal runaway of the battery pack 100 can be quickly discharged, so as to realize accurate control of the valve opening action of the valve body 320, improve the explosion-proof reaction speed, and reduce the risk of thermal runaway of the battery.

[0058] In one embodiment, Figures 4 to 7As shown, the valve body 320 is provided with a pressure relief channel 322 , and a cover body 324 is provided at a first end of the pressure relief channel 322 ; the cover body 324 is configured to adjust the opening and closing state of the pressure relief channel 322 based on the driving member 332 .

[0059] The shape of the pressure relief channel 322 may be cylindrical. The first end of the pressure relief channel 322 may be located outside the accommodating cavity, and the cover 324 may be covered on the first end of the pressure relief channel 322 by means of snap connection or bonding. For example, the opening and closing states of the pressure relief switch may include a closed state, a partially open state, and a fully open state. When the cover 324 is closed, the pressure relief channel 322 can be completely sealed, that is, the pressure relief channel 322 is in a closed state, so that the accommodating cavity forms a closed space; when the cover 324 is partially open, the interior of the accommodating cavity can be connected to the external atmosphere, and the water vapor and other debris outside the battery box 200 cannot enter the accommodating cavity through the valve body 320, that is, the pressure relief channel 322 is in a partially open state; when the cover 324 is fully open, the gas produced by the battery pack 100 due to thermal runaway can be quickly discharged, that is, the pressure relief channel 322 is in a fully open state.

[0060] Exemplarily, based on the received collection signal, when the working state of the battery pack 100 is a stationary state, the air pressure in the accommodating cavity of the battery case 200 is consistent with the external air pressure, and there is no need to open the valve body 320. Therefore, the processing unit 334 drives the driving member 332 to rotate in the opposite direction for a preset number of circles or does not drive the driving member 332 to work, and the cover body 324 closes or maintains the closed pressure relief channel 322, so that the accommodating cavity of the battery case 200 forms an enclosed space. When the battery pack 100 is in the charging and discharging state, the temperature generated by the battery pack 100 will cause the accommodating cavity of the battery case 200 to expand, resulting in a change in air pressure. Therefore, the processing unit 334 drives the driving member 332 to rotate in the positive direction for the first preset number of circles, and controls the cover body 324 to be partially open, that is, the pressure relief channel 322 is in a partially open state. Then, the interior of the accommodating cavity of the battery case 200 can be connected to the external atmosphere, so that the air pressure in the accommodating cavity of the battery case 200 is balanced with the external air, and water vapor and other debris outside the battery case 200 cannot enter the accommodating cavity through the valve body 320, thereby avoiding contamination of the battery pack 100 in the battery case 200. When the working state of the battery pack 100 is out of control, that is, when any single cell 110 of the battery pack 100 has thermal runaway, the temperature and air pressure of the battery pack 100 change dramatically, resulting in drastic changes in the temperature and air pressure in the accommodating cavity of the battery case 200. Therefore, the processing unit 334 drives the driving member 332 to rotate forward for a second preset number of circles, controls the cover 324 to be fully opened or lifts the cover 324, so that the pressure relief channel 322 is fully opened, and the interior of the accommodating cavity of the battery case 200 is in direct contact with the external atmosphere, quickly balancing the pressure difference between the inside and outside of the case caused by the thermal runaway of the battery pack 100, and can quickly discharge the gas generated by the thermal runaway of the battery pack 100, thereby achieving accurate control of the valve opening action of the valve body 320, improving the explosion-proof reaction speed, and reducing the risk of thermal runaway of the battery.

[0061] In one embodiment, Figure 6 and Figure 7 As shown, a transmission rod 326 is arranged in the pressure relief channel 322 , the first end of the transmission rod 326 is arranged adjacent to the cover body 324 , and the second end of the transmission rod 326 is connected to the driving member 332 ; the transmission rod 326 is configured to close, partially open or fully open the cover body 324 based on the driving member 332 .

[0062] Among them, the transmission rod 326 can be sleeved with an elastic member. When the transmission rod 326 applies pressure to the cover body 324 so that the cover body 324 is half open, the elastic member is in a compressed state; when the cover body 324 needs to be closed, when the working state of the battery pack 100 is a static state, the cover body 324 needs to be closed, and the elastic restoring force of the elastic member can be used to drive the transmission rod 326 to reset, thereby achieving the closure of the cover body 324.

[0063] Exemplarily, based on the second end of the transmission rod 326 being connected to the driving member 332, when the working state of the battery pack 100 is static, there is no need to open the valve body 320, so the processing unit 334 drives the driving member 332 to rotate in the opposite direction for a preset number of circles or does not drive the driving member 332 to work, and resets the transmission rod 326, then the cover body 324 closes or maintains the closed pressure relief channel 322, so that the accommodating cavity of the battery box 200 forms an enclosed space. When the working state of the battery pack 100 is the charging and discharging state, the temperature generated by the battery pack 100 will cause the accommodating cavity of the battery box 200 to expand, resulting in a change in air pressure. Therefore, the processing unit 334 drives the driving member 332 to rotate in the positive direction for the first preset number of circles, and drives the transmission rod 326 to move through the driving member 332, and then the transmission rod 326 applies pressure to the cover body 324 until the cover body 324 is partially open, that is, the pressure relief channel 322 is in a partially open state, then the interior of the accommodating cavity of the battery box 200 can be connected to the external atmosphere, so that the air pressure in the accommodating cavity of the battery box 200 is balanced with the external air, and the water vapor and other debris outside the battery box 200 cannot enter the accommodating cavity through the valve body 320, so as to avoid contaminating the battery pack 100 in the battery box 200. When the working state of the battery pack 100 is out of control, that is, when any single cell 110 of the battery pack 100 has thermal runaway, the temperature and air pressure of the battery pack 100 change dramatically, resulting in drastic changes in the temperature and air pressure in the accommodating chamber of the battery box 200. Therefore, the processing unit 334 drives the driving member 332 to rotate in the positive direction for a second preset number of circles, and drives the transmission rod 326 to move through the driving member 332, and then the transmission rod 326 applies pressure to the cover body 324 until the cover body 324 is fully opened or the cover body 324 is lifted, so that the pressure relief channel 322 is fully opened, and the inside of the accommodating chamber of the battery box 200 is in direct contact with the external atmosphere, quickly balancing the pressure difference between the inside and outside of the box caused by the thermal runaway of the battery pack 100, and can quickly discharge the gas produced by the thermal runaway of the battery pack 100, so as to achieve accurate control of the valve opening action of the valve body 320, improve the explosion-proof reaction speed, and reduce the risk of thermal runaway of the battery.

[0064] In one embodiment, Figure 4 , Figure 6 and Figure 7 As shown, the second end of the transmission rod 326 is provided with an interface module 328 , the first end of the interface module 328 is connected to the processing unit 334 , the second end of the interface module 328 is connected to the collection component 350 , and the third end of the interface module 328 is connected to the driving member 332 .

[0065] The interface module 328 can be arranged at the second end of the transmission rod 326 by bonding, welding or screwing. For example, the interface module 328 is provided with a plurality of ports, the processing unit 334 can be plugged into the first end of the interface module 328 through the first connecting line, the collection component 350 can be plugged into the second end of the interface module 328 through the first wiring harness, and the driving member 332 can be plugged into the third end of the interface module 328 through the second wiring harness. By providing the interface module 328, the processing unit 334 can be electrically connected to the collection component 350 and the driving member 332 respectively, and the first wiring harness, the first connecting line and the second connecting line can be collected to avoid the interlacing and confusion between the connecting lines.

[0066] In one embodiment, Figures 4 to 7 As shown, the control module 330 further includes a first shell 342 , which is detachably disposed at the second end of the pressure relief channel 322 ; the driving member 332 is installed in the first shell 342 .

[0067] The first shell 342 may be a ring-shaped structure, and the first shell 342 may be used to install the driving member 332 , so that when the immersion liquid is injected into the battery box 200 , the driving member 332 is prevented from contacting the immersion liquid and causing a short circuit.

[0068] The first shell 342 can be set at the second end of the pressure relief channel 322 by bonding, clamping or screwing. For example, the first shell 342 can be sleeved on the outer periphery of the second end of the pressure relief channel 322 to prevent the first shell 342 from blocking the second end of the pressure relief channel 322.

[0069] In one embodiment, Figures 4 to 7 As shown, the control module 330 further includes a second shell 344 , which is detachably disposed on the first shell 342 ; the processing unit 334 is installed in the second shell 344 .

[0070] The second shell 344 may be a ring-shaped structure, and the second shell 344 may be used to install the processing unit 334 , so that when the immersion liquid is injected into the battery box 200 , the processing unit 334 is prevented from contacting the immersion liquid and causing a short circuit.

[0071] The second shell 344 can be set on the first shell 342 by bonding, clamping or screwing. For example, the first shell 342 and the second shell 344 are both annular shells, and the inner diameter of the second shell 344 is greater than or equal to the inner diameter of the first shell 342. The second shell 344 can be sleeved on the outer periphery of the second end of the pressure relief channel 322, thereby preventing the second shell 344 from blocking the second end of the pressure relief channel 322.

[0072] In one embodiment, Figure 3 , Figure 8 and Fig.10 As shown, the battery pack 100 includes a plurality of single cells 110 , and the acquisition component 350 includes a plurality of acquisition chips 352 ; the single cell 110 is provided with at least one acquisition chip 352 , and each acquisition chip 352 is connected to the control module 330 .

[0073] The individual battery cells 110 may be connected in series and / or in parallel to form a battery pack 100 ; the acquisition chip 352 may be a temperature acquisition chip 352 , a voltage acquisition chip 352 , or an electrochemical AC impedance.

[0074] For example, one side (such as the top side) of the single cell 110 is provided with any one of the temperature acquisition chip 352, the voltage acquisition chip 352 and the electrochemical AC impedance chip; in another example, one side of the single cell 110 may also be provided with any combination of the temperature acquisition chip 352, the voltage acquisition chip 352 and the electrochemical AC impedance chip.

[0075] Based on the electrical connection of each acquisition chip 352 to the control module 330, each acquisition chip 352 acquires the acquisition signal (such as temperature signal, voltage signal or electrochemical AC impedance signal) of the corresponding single battery cell 110, and transmits the acquired acquisition signal to the control module 330. Then, the control module 330 drives the opening and closing of the valve body 320 according to the acquisition signal transmitted by the corresponding acquisition chip 352, realizes the on-off state control of the accommodating cavity and the external environment, responds to the changes inside the battery pack in time to make corresponding actions, improves the explosion-proof reaction speed, and reduces the risk of thermal runaway of the battery by accurately controlling the valve opening action of the valve body 320.

[0076] In one embodiment, Figure 3 As shown, the processing unit 334 includes a processor 336 and a pressure sensor 338; the pressure sensor 338 is connected to the processor 336, and the processor 336 is respectively connected to the driving member 332 and the acquisition component 350.

[0077] The pressure sensor 338 may be used to detect the air pressure in the accommodating cavity of the battery cavity.

[0078] Based on the processor 336, the pressure sensor 338, the driving member 332 and the collection component 350 are electrically connected respectively, so that the pressure sensor 338 detects the air pressure in the accommodating chamber of the battery box 200, and transmits the detected air pressure signal to the processor 336; the collection component 350 collects the collection signal of each single battery cell 110 in the battery pack 100, and transmits the collected collection signal to the processor 336, and then the processor 336 drives the opening and closing of the valve body 320 according to the air pressure signal and the collection signal, realizes the on-off state control of the accommodating chamber and the external environment, responds to the changes inside the battery pack in time to make corresponding actions, improves the explosion-proof reaction speed, and reduces the risk of thermal runaway of the battery by accurately controlling the valve opening action of the valve body 320.

[0079] In one embodiment, Figures 8 to 10 As shown, a battery pack is also provided, including a battery pack, a battery box and a battery explosion-proof monitoring device as described above; the battery pack and the battery explosion-proof monitoring device are respectively arranged in the battery box.

[0080] The battery pack may include a plurality of single cells, each of which may be a square cell, and each of the single cells is arranged in a plurality of rows and columns in a receiving cavity of the battery box.

[0081] For the specific description of the battery explosion-proof monitoring device and the battery box, reference may be made to the specific description of the battery explosion-proof monitoring device and the battery box in the above embodiments, which will not be repeated here.

[0082] The valve body assembly is arranged at the installation port of the battery box, and the control module is arranged on the valve body of the valve body assembly; the collection assembly is arranged in the battery pack, and the collection assembly is connected to the control module of the valve body assembly; the control module is configured to drive the on and off of the valve body to control the opening and closing of the accommodating chamber to realize explosion-proof monitoring of the battery pack. The present application sets a valve body assembly at the installation port of the battery box, sets a collection assembly on the battery pack, and then the collection assembly transmits the collected collection signal to the control module of the valve body assembly. The control module drives the opening and closing of the valve body according to the collection signal to realize the on and off state control of the accommodating chamber and the external environment, and promptly responds to the changes inside the battery pack to make corresponding actions, such as closing the explosion-proof valve to make the battery pack a closed space, and opening the valve body to connect the battery pack with the external atmosphere, quickly balancing the pressure difference between the inside and outside of the box caused by thermal runaway of the battery pack, and can quickly discharge the gas produced by the thermal runaway of the battery pack, thereby improving the explosion-proof reaction speed, and reducing the risk of thermal runaway of the battery by accurately controlling the valve opening action of the valve body.

[0083] In one embodiment, an immersion liquid is provided in the battery box, the battery pack includes a plurality of single cells, an explosion-proof valve is provided on the first side of the single cell, and the immersion liquid is used to immerse the explosion-proof valve of each single cell.

[0084] Among them, the first side of the single cell is a side adjacent to the installation port of the battery case, such as the first side of the single cell is the top surface. The immersion liquid can be used to cool and dissipate the heat of the battery pack in the accommodating cavity of the battery case. By injecting the immersion liquid into the accommodating cavity of the battery case, the immersion liquid immerses the explosion-proof valve of each single cell. In one example, the immersion liquid immerses the explosion-proof valve of each single cell by a distance of 10 to 20 mm, and then when the single cell has thermal runaway, the explosion-proof valve of the corresponding single cell is triggered to open, and the immersion liquid in the accommodating cavity can enter the single cell where thermal runaway occurs, reducing or preventing the occurrence of thermal runaway of the corresponding single cell. At the same time, by fully opening the valve body, the inside of the accommodating cavity of the battery case is in direct contact with the external atmosphere, quickly balancing the pressure difference between the inside and outside of the box caused by thermal runaway of the battery pack, and can quickly discharge the gas produced by the battery pack due to thermal runaway, thereby further reducing the risk of thermal runaway of the entire battery pack.

[0085] It should be noted that the battery pack may also include components such as positive and negative terminals. The specific battery pack may include more components than those described in the above embodiments, or combine certain components, or have a different arrangement of components.

[0086] The technical features of the above-described embodiments may be arbitrarily combined. To make the description concise, not all possible combinations of the technical features in the above-described embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0087] The above-mentioned embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the utility model patent. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the patent of the present application shall be subject to the attached claims.

Claims

1. A battery explosion-proof monitoring device, characterized in that: Applied to a battery pack, the battery pack includes a battery group and a battery box, the battery box is provided with a receiving cavity and a mounting opening, the battery group is arranged in the receiving cavity; the battery explosion-proof monitoring device includes: A valve body assembly, the valve body assembly is arranged at the installation port, the valve body assembly comprises a valve body and a control module, and the control module is arranged at the valve body; A collection component is arranged on the battery pack and connected to the control module; the control module is configured to drive the opening and closing of the valve body to control the on-off state between the accommodating chamber and the external environment.

2. The battery explosion-proof monitoring device according to claim 1, characterized in that: The control module includes a driving member and a processing unit; The driving member is connected to the valve body, and the processing unit is respectively connected to the driving member and the collection component; The processing unit is configured to drive the driving member to control the opening and closing of the valve body.

3. The battery explosion-proof monitoring device according to claim 2, characterized in that: The valve body is provided with a pressure relief channel, and a cover body is provided at a first end of the pressure relief channel; The cover body is configured to adjust the opening and closing state of the pressure relief channel based on the driving member.

4. The battery explosion-proof monitoring device according to claim 3, characterized in that: A transmission rod is arranged in the pressure relief channel, a first end of the transmission rod is arranged adjacent to the cover body, and a second end of the transmission rod is connected to the driving member; The transmission rod is configured to close, partially open or fully open the cover based on the driving member.

5. The battery explosion-proof monitoring device according to claim 4, characterized in that: An interface module is disposed at the second end of the transmission rod, a first end of the interface module is connected to the processing unit, a second end of the interface module is connected to the acquisition component, and a third end of the interface module is connected to the driving member.

6. The battery explosion-proof monitoring device according to claim 3, characterized in that: The control module further includes a first housing, which is detachably disposed at the second end of the pressure relief passage; The driving member is installed in the first shell.

7. The battery explosion-proof monitoring device according to claim 6, characterized in that: The control module further includes a second housing, which is detachably mounted on the first housing; The processing unit is installed in the second shell.

8. The battery explosion-proof monitoring device according to claim 2, characterized in that: The battery pack includes a plurality of single cells, and the acquisition component includes a plurality of acquisition chips; The single cell is provided with at least one acquisition chip, and each acquisition chip is connected to the control module.

9. The battery explosion-proof monitoring device according to any one of claims 2 to 8, characterized in that: The processing unit includes a processor and a pressure sensor; the pressure sensor is connected to the processor, and the processor is respectively connected to the driving member and the acquisition component.

10. A battery pack, characterized in that: It comprises a battery pack, a battery box and a battery explosion-proof monitoring device as claimed in any one of claims 1 to 9; The battery pack and the battery explosion-proof monitoring device are respectively arranged on the battery box.

11. The battery pack according to claim 10, characterized in that: The battery box is provided with an immersion liquid, the battery pack includes a plurality of single cells, the first surface of the single cells is provided with an explosion-proof valve, and the immersion liquid is used to immerse the explosion-proof valve of each of the single cells.

12. The battery pack according to claim 11, characterized in that: The immersion liquid immerses the explosion-proof valve of the single battery cell by a distance ranging from 10 to 20 mm.

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