Power battery and thermal management system thereof

Abstract

The invention discloses a power battery and a thermal management system thereof, and belongs to the technical field of new energy automobiles. The power battery comprises a lower shell, the lower shell comprises a frame, an inner cavity is defined by the frame, a gas channel is formed in the frame, and the gas channel comprises a first opening located in the inner side of the lower shell and a second opening located in the outer side of the lower shell; the battery module comprises at least one battery cell, the battery cell is located in the inner cavity, a pressure relief device is arranged on the battery cell, and the pressure relief device is communicated with the first opening; and the detection device is arranged in the gas channel, is suitable for being in signal connection with a battery management system, and is used for detecting and uploading the gas state in the gas channel. According to the power battery, the thermal runaway phenomenon in the power battery can be detected in time, so that the secondary risk caused by thermal runaway is avoided.

Description

Technical Field

[0001] The present application relates to the field of new energy vehicle technology, and in particular to a power battery and a thermal management system thereof. Background Art

[0002] Thermal runaway of power batteries refers to the phenomenon of uncontrollable rise in battery temperature caused by the heat release chain reaction of the battery cells in the power battery.

[0003] Thermal runaway of batteries usually results in a series of irreversible failure phenomena, such as capacity decay, deformation, rupture, battery fire, etc., which in turn affect the vehicle's range, charging speed, safety, etc.

[0004] The solution to thermal runaway usually involves multiple levels and multiple links, including improving battery cell materials, improving battery production processes, effective thermal management of batteries and other technical means, as well as prevention, timely detection, effective response and other management links.

[0005] In the related art, an effective thermal management system is usually established to deal with thermal runaway of power batteries, so that the thermal management system can monitor the working status of the battery in real time through the electrical components in the power battery, thereby ensuring that the power battery can be within a suitable operating temperature range and avoiding the occurrence of thermal runaway.

[0006] However, when thermal runaway occurs, the electrical components in the above method may not work, making it impossible for the thermal management system to detect the thermal runaway inside the power battery in time, thus missing the opportunity to cool down in the early stage of the thermal runaway. The heat diffusion caused by the thermal runaway will further affect the normal operation of the power battery. Summary of the invention

[0007] The present application provides a vehicle transmission shift control solution to at least solve the technical problem that the thermal runaway phenomenon of the power battery cannot be discovered in time in the related art. Specifically, it includes the following technical solutions:

[0008] In a first aspect, the present application provides a power battery, comprising: a lower shell, the lower shell comprising a frame, the frame enclosing an inner cavity, a gas channel formed in the frame, the gas channel comprising a first opening located on the inner side of the lower shell and a second opening located on the outer side of the lower shell; a battery module, the battery module comprising at least one battery cell, the battery cell being located in the inner cavity, and a pressure relief device being provided on the battery cell, the pressure relief device being connected to the first opening; a detection device, the detection device being arranged in the gas channel and being suitable for being connected to a battery management system signal, for detecting and uploading the gas state in the gas channel.

[0009] In some possible embodiments, the power battery further includes a temperature regulating device disposed in the inner cavity, and the detection device is further configured to generate a first warning signal when the gas state in the gas channel satisfies a first condition, so that the temperature regulating device regulates the temperature of the power battery according to the first warning signal.

[0010] In some other possible embodiments, the battery module further includes an electrical component electrically connected to the battery cell, wherein the electrical component is used to detect the working state of the battery cell and generate a second warning signal when the working state of the battery cell meets a second condition; the temperature adjustment device is also used to adjust the temperature of the power battery according to the second warning signal.

[0011] In some further possible implementations, the lower shell further includes an exhaust device, and the pressure relief device is connected to the first opening via the exhaust device.

[0012] In some other possible embodiments, the exhaust device includes an exhaust cavity, which is connected to the gas channel, and the exhaust cavity includes a first groove opposite to the pressure relief device, and the pressure relief device is located in the first groove to be connected to the first opening through the exhaust cavity.

[0013] In some other possible implementations, the detection device may also be disposed in the exhaust device to detect and upload the gas state in the exhaust device.

[0014] In some further possible implementations, the detection device includes a plurality of detection elements, and the plurality of detection elements are evenly distributed in the gas channel and / or the exhaust device.

[0015] In a second aspect, the present application provides a thermal management system for a power battery, comprising: the power battery described in the first aspect of the present application and its multiple embodiments; a control unit, the control unit being communicatively connected to the power battery, and being used to determine whether a pressure relief device on a cell in the power battery is open based on data detected by a detection device in the power battery.

[0016] In some possible implementations, the power battery further includes a temperature regulating device, and the control unit is further configured to: in response to receiving a first warning signal generated by the detection device, control the temperature regulating device to regulate the temperature of the power battery.

[0017] In some other possible implementations, the control unit is further configured to: in response to receiving a second warning signal generated by an electrical component in the power battery, control the temperature adjustment device to adjust the temperature of the power battery.

[0018] The beneficial effects of the technical solution provided by the embodiments of the present application include at least:

[0019] This application uses a pressure relief device at the bottom of the battery cell and a gas channel connected to the pressure relief device, so that the high-temperature gas and / or electrolyte emitted when the power battery has thermal runaway can be discharged to the outside of the lower shell of the power battery through a dedicated gas channel, isolating the possibility of direct contact between the high-temperature gas and / or electrolyte emitted by the thermal runaway battery cell and other battery cells, and avoiding the secondary risks that may be caused by thermal runaway. In addition, through the detection device set in the gas channel, this application can also perform real-time detection of the gas state in the gas channel, and judge whether there is a thermal runaway phenomenon in the power battery based on the gas state in the gas channel, so that this application can respond to the thermal runaway phenomenon of the power battery in a timely manner. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 is a schematic diagram of an exploded view of a partial structure of a power battery after disassembly and assembly provided in an embodiment of the present application;

[0022] Figure 2 is a schematic diagram of a longitudinal section of a partial structure of a power battery after disassembly and assembly provided by an embodiment of the present application;

[0023] Figure 3 is a front view of a cell of a power battery provided in an embodiment of the present application;

[0024] Figure 4 is a schematic diagram of an exploded view of a partial structure of another power battery after disassembly and assembly provided in an embodiment of the present application;

[0025] Figure 5 It is a structural schematic diagram of a thermal management system of a power battery provided in an embodiment of the present application.

[0026] The reference numerals in the accompanying drawings represent respectively:

[0027] 1. Lower shell;

[0028] 11. frame; 12. inner cavity; 13. gas channel; 111. first opening; 112. second opening; 113. first wall; 114. second wall;

[0029] 2. Battery module;

[0030] 21. battery cell; 22. electrical component; 211. pressure relief device; 212. pole; 213. first side; 214. second side;

[0031] 3. Exhaust device;

[0032] 31. The first groove. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are 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 are within the scope of protection of this application.

[0034] 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.

[0035] Inside the power battery, when one or more battery cells (i.e., battery cells) experience thermal runaway, on the one hand, the temperature will rise sharply, and on the other hand, the battery cells in thermal runaway may emit high-temperature gas and / or electrolyte. The heat generated by the above two situations may cause other battery cells in the system to experience thermal runaway one after another, causing the thermal runaway phenomenon to further spread inside the power battery. Therefore, in order to deal with the thermal runaway phenomenon of the power battery, it is necessary to promptly detect and open the cooling system, and to effectively handle the high-temperature gas and / or electrolyte that may erupt after the thermal runaway of the battery cells to avoid further spread of heat.

[0036] In the related art, the method of preventing or dealing with thermal failure through thermal management system relies on the detection of battery working status by power battery components. However, when thermal runaway occurs, the rapid temperature rise of battery cells may cause the battery cell structure to be damaged, resulting in arc, short circuit, insulation failure, open circuit and other situations, making the electrical components unable to work normally, and thus unable to start the cooling system in the first place, missing the cooling opportunity at the early stage of thermal runaway of the cells.

[0037] In view of this, the embodiment of the present application provides a power battery and a thermal management system thereof to at least solve the problems existing in the related art. The technical solution of the present application will be described in detail below in conjunction with the accompanying drawings and embodiments.

[0038] Figure 1is a schematic diagram of an exploded view of a partial structure of a power battery after disassembly and assembly provided in an embodiment of the present application, Figure 2 is a schematic diagram of a longitudinal section of a partial structure of a power battery after disassembly and assembly provided in an embodiment of the present application. Figure 1 and Figure 2 The power battery provided in the embodiment of the present application includes: a lower shell 1, a battery module 2 including at least one battery cell 21, and a detection device.

[0039] The lower shell 1 can be used to provide support and protection for other structures of the power battery, and includes a frame 11 and an inner cavity 12 surrounded by the frame 11. A gas channel 13 can be formed in the frame 11, and the gas channel 13 includes a first opening 111 located on the inner side of the lower shell 1 and a second opening 112 located on the outer side of the lower shell 1, which can be used to keep the inner cavity 12 of the lower shell 1 connected to the outside.

[0040] The battery cell 21 can be used as a basic unit for storing and releasing electric energy of a power battery, and is disposed in the inner cavity 12 . A pressure relief device 211 is disposed on the battery cell 21 , and the pressure relief device 211 is communicated with the first opening 111 .

[0041] In some embodiments, the frame 11 may further include a first wall 113 opposite to the pressure relief device 211, the battery cell 21 may be located on the first wall 113, and the pressure relief device 211 on the battery cell 21 is opposite to the first wall 113. The first opening 111 may, for example, be located at a position on the first wall 113 opposite to the pressure relief device 211, and the pressure relief device 211 may, for example, be directly connected to the first opening 111 located at a position on the first wall 113 opposite to the pressure relief device 211.

[0042] As mentioned above, when one or more battery cells 21 are out of control, high-temperature gas and / or electrolyte may be ejected. The pressure relief device 211 can be used to provide an outlet for releasing pressure for the battery cell 21 that has thermal runaway when the battery cell 21 has thermal runaway. Furthermore, the high-temperature gas and / or electrolyte ejected from the battery cell 21 that has thermal runaway is introduced into the gas channel 13 from the first opening 111 directly connected to the pressure relief device 211, and is discharged to the outside of the lower shell 1 through the second opening 112, thereby isolating the high-temperature gas and / or electrolyte ejected from the battery cell 21 that has thermal runaway from other battery cells 21 in the power battery that have not experienced thermal runaway, thereby avoiding secondary risks caused by thermal runaway.

[0043] The detection device is disposed in the gas channel 13 and is suitable for being connected to the battery management system signal, and is used to detect and upload the gas state in the gas channel 13. The gas state in the gas channel 13 may be, for example, air pressure, temperature, gas composition, etc., and the detection device may be, for example, any device that can detect the gas state in the gas channel 13.

[0044] In some embodiments, the detection device may be, for example, a temperature detection device, an air pressure detection device, and / or a gas composition detection device, etc., and the present application is not limited in this respect. The battery management system may be used to intelligently manage the power battery (for example, to manage the temperature inside the power battery) and may transmit signals with the detection device by wired or wireless means. In some embodiments, the battery management system may be, for example, an electronic system connected to the detection device by wire, or an MCU (Microcontroller Unit) connected to the detection device wirelessly.

[0045] When thermal runaway occurs in the battery cell 21, the erupted high-temperature gas and / or electrolyte can be discharged to the outside of the lower shell 1 through the gas channel 13. At this time, the gas state in the gas channel 13, such as air pressure, temperature, composition, etc., will change, so that the detection device can upload the detected changes in the gas state in the gas channel 13 to the battery management system in time, so as to promptly discover the thermal runaway phenomenon in the power battery.

[0046] Considering that when thermal runaway occurs in a power battery, a large amount of heat will be generated, which will affect the normal operation of the power battery. In view of this, a temperature regulating device can be set inside the power battery, and when the detection device detects that thermal runaway occurs in the power battery, a timely response can be made to the thermal runaway phenomenon.

[0047] In some embodiments, the power battery also includes a temperature regulating device arranged in the inner cavity 12, and the detection device is also used to generate a first warning signal when the gas state in the gas channel 13 meets the first condition, so that the temperature regulating device can adjust the temperature of the power battery according to the first warning signal.

[0048] In some embodiments, the temperature regulating device may be, for example, a liquid cooling plate, a heat exchanger, an air cooling system, or any other device that can be used to regulate the temperature of the power battery, and the present application does not impose any limitation in this regard.

[0049] In some other embodiments, the position of the temperature regulating device in the inner cavity 12 can be, for example, between the first wall 113 of the frame 11 and the battery cell 21, and a first channel is formed on the temperature regulating device opposite to the pressure relief device 211, so that the pressure relief device 211 can be directly connected to the first opening 111.

[0050] As mentioned above, the gas state in the gas channel 13 may include multiple types such as temperature, pressure, and gas composition. When the gas state in the gas channel 13 of the detection device meets the first condition, the first condition in generating the first warning signal can also be set according to the type of gas state detected by the detection device. For example, it can be that the gas temperature in the gas channel 13 exceeds the first temperature threshold, or the gas pressure in the gas channel 13 exceeds the first pressure threshold, or a specific substance is detected in the gas in the gas channel 13. Among them, the aforementioned first temperature threshold, first pressure threshold, specific substance, etc. can be set according to the possible temperature, pressure, and possible substances in the gas channel 13 when the power battery is thermally runaway, and this application does not impose any restrictions on this.

[0051] It is also considered that the power battery will generate a certain amount of heat when there is no thermal runaway phenomenon, which will increase the temperature of the power battery and affect the normal operation of the power battery. At this time, the detection device located in the gas channel 13 has a low sensitivity when detecting the working state of the power battery, and it is impossible to open the temperature adjustment system in time and accurately according to the needs of the power battery. In view of this, the working scenes of the temperature adjustment device can be divided into two types, including: temperature adjustment when the power battery does not have thermal runaway and temperature adjustment when the power battery has thermal runaway, and different control logics are set for the two working scenes to adjust the temperature of the power battery in time and accurately.

[0052] In some embodiments, the battery module 2 may further include an electrical component 22 electrically connected to the battery cell 21, and the electrical component 22 may be used to detect the working state of the battery cell 21 and generate a second warning signal when the working state of the battery cell 21 meets a second condition; the temperature adjustment device may also be used to adjust the temperature of the power battery according to the second warning signal.

[0053] The working state of the battery cell 21 may include, for example, temperature, current, voltage, and other types. The electrical component 22 electrically connected to the battery cell 21 may be used to detect the temperature, current, voltage, and other conditions of the battery cell 21. In some embodiments, the electrical component 22 may include, for example, a current sensor, a temperature sensor, and / or a voltage sensor, etc., to detect the working state of the battery cell 21, such as temperature, current, voltage, and other conditions.

[0054] In some other embodiments, the working state of the battery cell 21 may include multiple types such as temperature, current, and voltage. The electrical component 22 is used to detect the working state of the battery cell 21, and when the working state of the battery cell 21 satisfies the second condition, the second condition in generating the second warning signal may also be set according to the type of the working state of the battery cell 21. For example, the temperature of the battery cell 21 may reach the second temperature threshold, the current of the battery cell 21 may exceed the second current threshold, or the voltage of the battery cell 21 may exceed the second voltage threshold, etc. Among them, the aforementioned second temperature threshold, second current threshold, and second voltage threshold may be set according to the temperature, current, and voltage that may need to be used to adjust the temperature of the battery cell 21 when the power battery does not have thermal runaway, and this application does not impose any restrictions on this.

[0055] As mentioned above, thermal runaway of the battery may cause arcing, short circuit, insulation failure, etc. In order to further improve the safety of the power battery and prevent arcing, short circuit, insulation failure, etc. caused by thermal runaway from further spreading to the electrical component 22, the electrical component 22 and the pressure relief device 211 may be separated to a certain extent.

[0056] In view of this, in some embodiments, the battery cell 21 further includes a pole 212 electrically connected to the electrical component 22 , and the pole 212 and the pressure relief device 211 may be disposed on different surfaces of the battery cell 21 .

[0057] Figure 3 is a front view of a cell of a power battery provided in an embodiment of the present application. Figure 3 The battery cell 21 includes a pressure relief device 211, a pole 212, a first surface 213, and a second surface 214. The pressure relief device 211 may be located on the first surface 213 of the battery cell 21, and the pole 212 may be located on other surfaces of the battery cell 21 except the first surface 213, for example, on the second surface 214 opposite to the first surface 213.

[0058] In order to improve the flexibility of multiple structural arrangements inside the power battery, the pressure relief device 211 and the first opening 111 may be connected in an indirect manner, for example, so that the position of the battery module 2 in the inner cavity 12 is more flexible.

[0059] In some embodiments, the lower shell 1 further includes an exhaust device 3 , and the pressure relief device 211 may be connected to the first opening 111 via the exhaust device 3 , for example.

[0060] Figure 4 is a schematic diagram of an exploded view of a partial structure of another power battery after disassembly and assembly provided in an embodiment of the present application. Figure 4 , Figure 41 is a schematic diagram of an exploded view of a partial structure of another power battery after disassembly and assembly provided in an embodiment of the present application. The power battery provided in an embodiment of the present application includes: a lower housing 1, a battery module 2, and a detection device. It should be noted that: Figure 4 The power battery is Figure 1 Another embodiment of the connection between the pressure relief device 211 and the first opening 111 in the power battery is shown in the figure, and the same contents will not be repeated here.

[0061] The lower housing 1 of the power battery may further include an exhaust device 3, which is used to connect the pressure relief device 211 to the first opening 111. In some embodiments, the exhaust device 3 may be detachably disposed on the lower housing 1, for example.

[0062] In some embodiments, the exhaust device 3 may, for example, include an exhaust cavity connected to the gas channel 13, and the exhaust cavity includes a first groove 31 opposite to the pressure relief device 211, and the pressure relief device 211 is located in the first groove 31 to be connected to the first opening 111 through the exhaust cavity.

[0063] In some embodiments, the frame 11 further includes a second wall 114 connected to the first wall 113, and the first opening 111 may also be located on the second wall 114. The exhaust cavity may be connected to the gas channel 13 through the first opening 111 located on the second wall 114, so that the pressure relief device 211 located in the first groove 31 may be connected to the gas channel 13 through the exhaust cavity. When one or more battery cells 21 are out of control, the high-temperature gas and / or electrolyte ejected from the battery cell 21 experiencing thermal runaway enters the exhaust cavity from the first groove 31 connected to the pressure relief device 211, then enters the gas channel 13 through the first opening 111 located on the second wall 114, and finally is discharged from the outside of the frame 11 through the second opening 112, thereby isolating the high-temperature gas and / or electrolyte ejected from the battery cell 21 experiencing thermal runaway from other battery cells 21 in the power battery that have not experienced thermal runaway, thereby avoiding secondary risks caused by thermal runaway.

[0064] Considering that when the pressure relief device 211 is connected to the first opening 111 through the exhaust device 3, the high-temperature gas and / or electrolyte emitted by the battery cell 21 in thermal runaway cannot enter the gas channel 13 of the frame 11 in the first time, the sensitivity of the detection device set in the gas channel 13 to thermal runaway is reduced. In view of this, the detection device can be set in the exhaust device 3 to improve the sensitivity of the detection device to thermal runaway of the battery cell 21. In some embodiments, the detection device can also be set in the exhaust device 3 to detect and upload the gas state in the exhaust device 3.

[0065] It is also considered that when the power battery includes multiple cells 21, the cells 21 with thermal runaway may be located at different positions of the power battery. In order to improve the sensitivity of the detection device to the thermal runaway cells 21 located at different positions, multiple detection elements may be provided to timely detect the thermal runaway cells 21 at different positions. In some embodiments, the detection device includes multiple detection elements, and the multiple detection elements are evenly distributed in the gas channel 13 and / or the exhaust device 3.

[0066] The present application uses a pressure relief device at the bottom of the battery cell and a gas channel 13 connected to the pressure relief device, so that the high-temperature gas and / or electrolyte ejected when the power battery has thermal runaway can be discharged to the outside of the lower shell of the power battery through the dedicated gas channel 13, thereby isolating the high-temperature gas and / or electrolyte ejected from the thermal runaway battery cell from the possibility of direct contact with other battery cells, thereby avoiding the secondary risks that may be caused by thermal runaway.

[0067] In addition, by means of a detection device disposed in the gas channel 13, the present application can also perform real-time detection of the gas state in the gas channel 13, and determine whether there is a thermal runaway phenomenon in the power battery according to the gas state in the gas channel 13, thereby enabling the present application to respond to the thermal runaway phenomenon of the power battery in a timely manner.

[0068] In some possible implementations, the present application also provides a thermal management system for a power battery. Figure 5 is a schematic diagram of the structure of a thermal management system for a power battery provided in an embodiment of the present application. Figure 5 The thermal management system 500 of the power battery includes:

[0069] According to the above combination Figure 1-Figure 4 The power battery 510 described in its multiple embodiments.

[0070] The control unit 520 is in communication with the power battery 510 and is used to determine whether the pressure relief device on the cell in the power battery 510 is opened according to the data detected by the detection device in the power battery 510. According to different implementations, the control unit 520 can be one or more types of processors in a CPU (central processing unit), a GPU (graphics processing unit), or other general and / or special processors, including but not limited to a DSP (digital sig nal processor), an ASIC (application specific integrated circuit), an FPGA (field-programmable gate array), or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc., and the number of them can be determined according to actual needs.

[0071] In some embodiments, the power battery 510 further includes a temperature regulating device, and the control unit 520 is further used to: in response to receiving a first warning signal generated by a detection device in the power battery 510 , control the temperature regulating device in the power battery 510 to regulate the temperature of the power battery 510 .

[0072] In some other embodiments, the control unit 520 is further configured to: in response to receiving a second warning signal generated by an electrical component in the power battery 510 , control a temperature regulating device in the power battery 510 to regulate the temperature of the power battery 510 .

[0073] In the embodiments of the present application, the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance. The term "plurality" refers to two or more, unless otherwise clearly defined.

[0074] The term "and / or" in the embodiments of the present application is merely a description of the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B may represent three situations: A exists alone, A and B exist at the same time, and B exists alone.

[0075] The above description is only for the purpose of facilitating the technical solution of the present application to be understood by those skilled in the art, and is not intended to limit the present application. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A power battery, characterized in that: include: A lower shell (1), the lower shell (1) comprising a frame (11), the frame (11) enclosing an inner cavity (12), a gas channel (13) formed in the frame (11), the gas channel (13) comprising a first opening (111) located on the inner side of the lower shell (1) and a second opening (112) located on the outer side of the lower shell (1); A battery module (2), the battery module (2) comprising at least one battery cell (21), the battery cell (21) being located in the inner cavity (12), and a pressure relief device (211) being provided on the battery cell (21), the pressure relief device (211) being in communication with the first opening (111); A detection device is arranged in the gas channel (13) and is suitable for being connected to a battery management system signal, and is used for detecting and uploading the gas state in the gas channel (13).

2. The power battery according to claim 1, characterized in that: The power battery further comprises a temperature regulating device arranged in the inner cavity (12), The detection device is also used to generate a first warning signal when the gas state in the gas channel (13) meets a first condition, so that the temperature adjustment device adjusts the temperature of the power battery according to the first warning signal.

3. The power battery according to claim 2, characterized in that: The battery module (2) further comprises an electrical component (22) electrically connected to the battery cell (21), the electrical component (22) being used to detect the working state of the battery cell (21) and to generate a second warning signal when the working state of the battery cell (21) satisfies a second condition; The temperature regulating device is further used to regulate the temperature of the power battery according to the second warning signal.

4. The power battery according to claim 1, characterized in that: The lower shell (1) further comprises an exhaust device (3), and the pressure relief device (211) is connected to the first opening (111) via the exhaust device (3).

5. The power battery according to claim 4, characterized in that: The exhaust device (3) comprises an exhaust cavity, the exhaust cavity is connected to the gas channel (13), and the exhaust cavity comprises a first groove (31) opposite to the pressure relief device (211), and the pressure relief device (211) is located in the first groove (31) to be connected to the first opening (111) through the exhaust cavity.

6. The power battery according to claim 4, characterized in that: The detection device may also be arranged in the exhaust device (3) to detect and upload the gas state in the exhaust device (3).

7. The power battery according to claim 1 or 4, characterized in that: The detection device comprises a plurality of detection elements, and the plurality of detection elements are evenly distributed in the gas channel (13) and / or the exhaust device (3).

8. A thermal management system for a power battery, comprising: The power battery according to claims 1-8; A control unit is communicatively connected with the power battery and is used to determine whether a pressure relief device on a cell in the power battery is opened according to data detected by a detection device in the power battery.

9. The thermal management system according to claim 8, characterized in that: The power battery further includes a temperature regulating device, and the control unit is further used for: In response to receiving the first warning signal generated by the detection device, the temperature adjustment device is controlled to adjust the temperature of the power battery.

10. The thermal management system according to claim 9, characterized in that: The control unit is also used for: In response to receiving a second warning signal generated by an electrical component in the power battery, the temperature adjustment device is controlled to adjust the temperature of the power battery.

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