Battery device and electric device

Abstract

The utility model relates to a battery device and a power utilization device. The battery device comprises at least two battery monomers which are sequentially connected in series, a thermal runaway detection circuit, a battery management system and an isolation circuit. The thermal runaway detection circuit is electrically connected with the single battery and used for detecting operation parameters of the single battery. The battery management system is connected with the thermal runaway detection circuit, and is used for determining a fault battery cell from the plurality of battery cells according to the operation parameters, and outputting a fault signal. And the isolation circuit is electrically connected with the single battery and is used for isolating the fault single battery according to the fault signal. The operation parameters of the single batteries are detected through the thermal runaway detection circuit, when the battery management system determines that the single batteries have the thermal runaway fault, the fault single batteries are isolated through the isolation circuit, and the other single batteries keep normal power supply work, so that the normal power supply of the battery device is ensured, and the power supply efficiency of the battery device is improved. And the safety problem caused by a thermal runaway fault of the single battery is also avoided.

Description

Technical Field

[0001] The present application relates to the technical field of battery protection, and in particular to a battery device and an electrical device. Background Art

[0002] With the development of new energy technology, more and more people are choosing new energy vehicles as their means of transportation. Most of the current new energy vehicles are powered by lithium batteries. For lithium batteries, when the battery temperature is too high or the charging voltage is too high, it will cause many potential heat release side effects. If this heat cannot be dissipated, it will cause the battery temperature and pressure to rise rapidly, and finally lead to thermal runaway of the battery, and even cause safety problems in the use of the car. Therefore, how to shield the battery with thermal runaway failure in the battery system to ensure the driving safety of the car has become a technical problem that technicians in this field need to solve urgently. Utility Model Content

[0003] The present application provides a battery device and an electrical device, which can isolate the faulty battery cells from the normal battery cells after the battery cells have a thermal runaway failure, thereby ensuring the normal power supply of the battery device and avoiding the safety problems caused by the thermal runaway failure of the battery cells.

[0004] In the first aspect, the present application provides a battery device, including: at least two battery cells connected in series; a thermal runaway detection circuit, a battery management system, and an isolation circuit. The thermal runaway detection circuit is electrically connected to the battery cell, and is used to detect the operating parameters of the battery cell; the battery management system is connected to the thermal runaway detection circuit, and is used to determine the faulty battery cell from multiple battery cells according to the operating parameters, and output a fault signal; the isolation circuit is electrically connected to the battery cell, and the isolation circuit is used to isolate the faulty battery cell according to the fault signal. The present application detects the operating parameters of each battery cell through a thermal runaway detection circuit. When the battery management system determines that a thermal runaway fault occurs in a battery cell, a fault signal is sent to the isolation circuit, and the faulty battery cell is isolated from the normal battery cell by controlling the isolation circuit, and the faulty battery cell is cut off from discharging to the outside, while the remaining battery cells maintain normal power supply. Therefore, the present application does not need to directly cut off the power supply of the entire battery device after a thermal runaway failure occurs in a battery cell. Instead, it only cuts off the power supply of the faulty battery cell and isolates it, so that the remaining battery cells remain connected in series. Therefore, it is possible to ensure the normal power supply of the battery device, so that the car will not lose power due to the thermal runaway failure of the battery device, and it can also avoid the problem of the battery device temperature rising due to the continued operation of the faulty battery cell, thereby ensuring the driving safety of the car.

[0005] In some embodiments, the isolation circuit includes: at least two switch circuits and a control circuit. The switch circuit is electrically connected to the battery cells one by one, and the switch circuit is used to short-circuit the battery cells; the control circuit is electrically connected to the control end of the switch circuit, and the control circuit is used to control the switch circuit to be turned on according to the fault signal. The embodiment of the present application isolates the faulty single cell battery through the turned-on switch circuit, and connects the single cells adjacent to the faulty single cell battery through the turned-on switch circuit, so that the single cells in the battery device that work normally are still connected in series in sequence, thereby ensuring the normal power supply of the battery device, and the car will not cut off the power supply of the entire battery device due to the thermal runaway failure of the battery cells in the battery device, ensuring that the car will not lose power due to the thermal runaway failure of the single cell battery during driving, and can also avoid the problem of vehicle spontaneous combustion caused by the increase in battery device temperature due to the continued operation of the faulty battery cell, further ensuring the driving safety of the car.

[0006] In some embodiments, the first end of the switch circuit is connected to the first pole of the corresponding battery cell, and the second end of the switch circuit is connected to the second pole of the corresponding battery cell. In the embodiment of the present application, it is not necessary to directly cut off the power supply of the entire battery device after the thermal runaway failure of the battery cell occurs. Instead, the switch circuit only stops the power supply of the faulty battery cell and isolates it, so that the remaining battery cells remain connected in series. Therefore, it is possible to ensure the normal power supply of the battery device, so that the car will not lose power due to the thermal runaway failure of the battery device, and it can also avoid the problem of the temperature of the battery device rising due to the continued operation of the faulty battery cell, thereby ensuring the driving safety of the car.

[0007] In some embodiments, the switch circuit includes a relay, and the control end of the relay is electrically connected to the control circuit. The embodiment of the present application isolates the faulty single cell through the conducting relay, and connects the single cells adjacent to the faulty single cell through the conducting relay, so that the single cells in the battery device that are working normally are still connected in series in sequence, so as to ensure the normal power supply of the battery device, and the car will not cut off the power supply of the entire battery device due to the thermal runaway failure of the battery cell in the battery device, so as to ensure that the car will not lose power due to the thermal runaway failure of the single cell during driving, and can also avoid the problem of the vehicle spontaneous combustion caused by the temperature increase of the battery device due to the continued operation of the faulty battery cell, and further ensure the driving safety of the car.

[0008] In some embodiments, the switch circuit includes a MOS tube, and the gate of the MOS tube is electrically connected to the control circuit. The embodiment of the present application isolates the faulty single cell through the turned-on MOS tube, and connects the single cells adjacent to the faulty single cell through the turned-on MOS tube, so that the single cells in the battery device that are working normally are still connected in series in sequence, so as to ensure the normal power supply of the battery device, and the car will not cut off the power supply of the entire battery device due to the thermal runaway failure of the battery cell in the battery device, ensuring that the car will not lose power due to the thermal runaway failure of the single cell during driving, and can also avoid the problem of the vehicle spontaneous combustion caused by the temperature increase of the battery device due to the continued operation of the faulty battery cell, further ensuring the driving safety of the car.

[0009] In some embodiments, the thermal runaway detection circuit includes: a voltage detection circuit. The voltage detection circuit is electrically connected to the battery cell and the battery management system; wherein the voltage detection circuit is used to detect the operating voltage of the battery cell, and the battery management system is used to determine the faulty battery cell according to the operating voltage and a preset voltage range. The embodiment of the present application detects the operating voltage of each battery cell by setting a voltage detection circuit, and the thermal failure of the battery cell can be detected according to the change of the operating voltage, so as to avoid safety problems caused by thermal runaway failure of the battery cell.

[0010] In some embodiments, the thermal runaway detection circuit includes: a temperature detection circuit. The temperature detection circuit is electrically connected to the battery management system; wherein the temperature detection circuit is used to detect the operating temperature of the battery cell, and the battery management system is used to determine the faulty battery cell according to the operating temperature and a preset temperature range. In the embodiment of the present application, the operating temperature of each battery cell is detected by the temperature detection circuit provided, and the thermal failure of the battery cell can be detected according to the temperature change of the battery cell, so as to avoid safety problems caused by thermal runaway failure of the battery cell.

[0011] In some embodiments, the thermal runaway detection circuit includes: an air pressure detection circuit. The air pressure detection circuit is electrically connected to the battery management system; wherein the air pressure detection circuit is used to detect the internal air pressure of the battery cell, and the battery management system is used to determine the faulty battery cell based on the internal air pressure and a preset air pressure range. In the embodiment of the present application, the internal air pressure of each battery cell is detected by the air pressure detection circuit provided, and the thermal failure of the battery cell can be detected according to the change of the air pressure inside the battery cell, so as to avoid safety problems caused by thermal runaway failure of the battery cell.

[0012] In some embodiments, the battery device further includes a prompt circuit; the prompt circuit is electrically connected to the battery management system, and the prompt circuit is used to issue a prompt message according to the fault signal. The prompt circuit issues a prompt message, so that the vehicle user can determine that the battery cell in the vehicle battery device has a thermal runaway fault according to the prompt message, and choose to stop driving the vehicle to prevent further faults in the vehicle from causing safety problems.

[0013] In a second aspect, the present application provides an electrical device, which includes at least one battery device as described in the above embodiments.

[0014] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments of the present application 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.

[0016] Figure 1 FIG. 1 is a schematic structural diagram of a battery device according to an embodiment of the present application.

[0017] Figure 2 FIG. 4 is a schematic structural diagram of another battery device according to an embodiment of the present application. DETAILED DESCRIPTION

[0018] The following embodiments of the technical solution of the present application are described in detail in conjunction with the accompanying drawings. The following embodiments are only used to more clearly illustrate the technical solution of the present application, and are therefore only used as examples, and cannot be used to limit the scope of protection of the present application.

[0019] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by technicians in the technical field to which this application belongs; the terms used herein are only for the purpose of describing specific embodiments and are not intended to limit this application; the terms "including" and "having" in the specification and claims of this application and the above-mentioned figure descriptions and any variations thereof are intended to cover non-exclusive inclusions.

[0020] In the description of the embodiments of the present application, the technical terms "first", "second", etc. are only used to distinguish different objects, and cannot be understood as indicating or implying relative importance or implicitly indicating the number, specific order or primary and secondary relationship of the indicated technical features. In the description of the embodiments of the present application, the meaning of "multiple" is more than two, unless otherwise clearly and specifically defined.

[0021] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0022] In the description of the embodiments of the present application, the term "and / or" is only a description of the association relationship of the associated objects, indicating that there may be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article generally indicates that the associated objects before and after are in an "or" relationship.

[0023] In the description of the embodiments of the present application, the term "multiple" refers to more than two (including two). Similarly, "multiple groups" refers to more than two groups (including two groups), and "multiple pieces" refers to more than two pieces (including two pieces).

[0024] In the description of the embodiments of the present application, the technical terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the embodiments of the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the embodiments of the present application.

[0025] In the description of the embodiments of the present application, unless otherwise clearly specified and limited, technical terms such as "installed", "connected", "connected", "fixed" and the like should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements or the interaction relationship between two elements. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present application can be understood according to the specific circumstances.

[0026] With the rapid development of new energy technologies, more and more people are choosing new energy vehicles as their means of transportation. Most of the current new energy vehicles are powered by lithium batteries. For lithium batteries, when the battery temperature is too high or the charging voltage is too high, it will cause many potential heat release side effects. If this heat cannot be dissipated, it will cause the battery temperature and pressure to rise rapidly, and finally lead to thermal runaway of the battery. After the thermal runaway failure of the battery occurs, the battery management system will cut off the power supply of the battery, causing the power of the entire vehicle to be lost, thus causing safety issues in the use of the vehicle.

[0027] Therefore, in order to solve the safety issues in automobile use caused by thermal runaway failures of batteries, the present application provides a battery device and an electrical device, which detect the operating parameters of battery cells through a thermal runaway detection circuit. When the battery management system determines that a thermal runaway failure has occurred in a battery cell, the faulty battery cell is isolated from the normal battery cell by controlling the isolation circuit, and the remaining battery cells maintain normal power supply. This ensures the normal power supply of the battery device while avoiding safety issues caused by thermal runaway failures of battery cells.

[0028] The battery device disclosed in the embodiment of the present application can be used, but not limited to, in electrical devices such as vehicles, ships or aircraft. The power supply system of the electrical device can be composed of the battery device disclosed in the present application, so that the faulty battery cell can be isolated according to the thermal runaway fault of the battery cell, and the safety problem caused by the thermal runaway fault of the battery cell can be avoided while ensuring the normal power supply of the battery device.

[0029] The embodiment of the present application provides an electric device using a battery device as a power source, and the electric device may be, but is not limited to, a mobile phone, a tablet, a laptop computer, an electric toy, an electric tool, a battery car, an electric car, a ship, a spacecraft, etc. Among them, the electric toy may include a fixed or mobile electric toy, for example, a game console, an electric car toy, an electric ship toy, an electric airplane toy, etc., and the spacecraft may include an airplane, a rocket, a space shuttle, a spacecraft, etc.

[0030] According to some embodiments of the present application, Figure 1 Schematic diagram of a battery device according to an embodiment of the present application. Figure 1As shown, the battery device includes: at least two battery cells 100 connected in series, a thermal runaway detection circuit 200, a battery management system 300 and an isolation circuit 400. The thermal runaway detection circuit 200 is electrically connected to the battery cell 100, and the thermal runaway detection circuit 200 is used to detect the operating parameters of the battery cell 100. The battery management system 300 is connected to the thermal runaway detection circuit 200, and the battery management system 300 is used to determine a faulty battery cell from a plurality of battery cells 100 according to the operating parameters, and output a fault signal. The isolation circuit 400 is electrically connected to the battery cell 100, and the isolation circuit 400 is used to isolate the faulty battery cell 100 according to the fault signal.

[0031] Exemplarily, at least two battery cells 100 connected in series in sequence include a first battery cell 110, a second battery cell 120, a third battery cell 130 and a fourth battery cell 140 arranged in series in sequence, the first pole of the first battery cell 110 is electrically connected to the total positive terminal 510 of the battery device, and the second pole of the fourth battery cell 140 is electrically connected to the total negative terminal 520 of the battery device. The isolation circuit 400 is electrically connected to the first battery cell 110, the second battery cell 120, the third battery cell 130 and the fourth battery cell 140. The thermal runaway detection circuit 200 is electrically connected to the first battery cell 110, the second battery cell 120, the third battery cell 130 and the fourth battery cell 140, respectively, the battery management system 300 is connected to the thermal runaway detection circuit 200, and the battery management system 300 is electrically connected to the isolation circuit 400.

[0032] Taking the thermal runaway failure of the second battery cell 120 as an example, the thermal runaway detection circuit 200 detects the operating parameters of each battery cell 100 and sends the detected operating parameters to the battery management system 300. When the battery management system 300 determines that the operating parameters of the second battery cell 120 are abnormal, that is, the second battery cell 120 has a thermal runaway failure, the battery management system 300 outputs a fault signal to the isolation circuit 400. The isolation circuit 400 isolates the second battery cell 120 according to the fault signal, and connects the first battery cell 110 and the third battery cell 130, so that the first battery cell 110 and the third battery cell 130 are connected in series, thereby making the battery cells 100 in normal working state still connected in series, and only the second battery cell 120 that has a thermal failure is individually isolated and stops working, so that the battery device can maintain normal power supply. The present application detects the operating parameters of each battery cell 100 through the thermal runaway detection circuit 200. When the battery management system 300 determines that the battery cell 100 has a thermal runaway fault, it sends a fault signal to the isolation circuit 400, and isolates the faulty battery cell from the normal battery cell by controlling the isolation circuit 400, cuts off the external discharge of the faulty battery cell, and the remaining battery cells 100 maintain normal power supply. Therefore, the present application does not need to directly cut off the power supply of the entire battery device after the thermal runaway fault occurs in the battery cell 100, but only cuts off the power supply of the faulty battery cell and isolates it, so that the remaining battery cells 100 remain in series, so that the normal power supply of the battery device can be guaranteed, so that the car will not lose power due to the thermal runaway fault of the battery device, and can also avoid the problem of the temperature of the battery device rising due to the continued operation of the faulty battery cell 100, thereby ensuring the driving safety of the car.

[0033] It should be noted that the at least two battery cells 100 connected in series include a first battery cell 110, a second battery cell 120, a third battery cell 130 and a fourth battery cell 140 connected in series for example only. The specific number of battery cells is set according to actual conditions and is not specifically limited here.

[0034] In some embodiments, the isolation circuit includes: at least two switch circuits and a control circuit. The switch circuits are electrically connected to the battery cells one by one, and the switch circuits are used to short-circuit the battery cells; the control circuit is electrically connected to the control end of the switch circuit, and the control circuit is used to control the switch circuit to conduct according to the fault signal.

[0035] Specifically, the switch circuit is set in one-to-one correspondence with the battery cell, and the switch circuit remains disconnected when the battery cell is working normally. When the battery management system determines that a battery cell has a thermal runaway fault through the thermal runaway detection circuit, the battery management system sends a fault signal to the control circuit, and the control circuit controls the switch circuit corresponding to the faulty single cell to be turned on according to the received fault signal, thereby short-circuiting the faulty single cell, and connecting adjacent single cells in series through the turned-on switch circuit, so that the normally working single cells in the battery device are still connected in series in sequence, and the faulty single cell is short-circuited by the turned-on switch circuit to isolate it from other normally working single cells, thereby ensuring the normal power supply of the battery device, and the car will not cut off the power supply of the entire battery device due to the thermal runaway fault of the battery cell in the battery device, ensuring that the car will not lose power due to the thermal runaway fault of the single cell during driving, and can also avoid the problem of the vehicle spontaneous combustion caused by the temperature increase of the battery device due to the continued operation of the faulty battery cell, further ensuring the driving safety of the car.

[0036] In some embodiments, a first end of the switch circuit is connected to a first pole of a corresponding battery cell, and a second end of the switch circuit is connected to a second pole of a corresponding battery cell.

[0037] For example, Figure 2 FIG. 1 is a schematic diagram of the structure of another battery device according to an embodiment of the present application. Figure 2 As shown, the isolation circuit includes a first switch circuit 410, a second switch circuit 420, a third switch circuit 430 and a fourth switch circuit 440. At least two battery cells connected in series in sequence include a first battery cell 110, a second battery cell 120, a third battery cell 130 and a fourth battery cell 140 arranged in series in sequence, a first pole of the first battery cell 110 is electrically connected to the total positive terminal 510 of the battery device, and a second pole of the fourth battery cell 140 is electrically connected to the total negative terminal 520 of the battery device.

[0038] The control circuit 450 is electrically connected to the battery management system 300, and the control circuit 450 is electrically connected to the control terminal 411 of the first switch circuit 410, the control terminal 421 of the second switch circuit 420, the control terminal 431 of the third switch circuit 430, and the control terminal 441 of the fourth switch circuit 440, respectively. The first end of the first switch circuit 410 is electrically connected to the first pole of the first battery cell 110, and the second end of the first switch circuit 410 is electrically connected to the second pole of the first battery cell 110. The first end of the second switch circuit 420 is electrically connected to the first pole of the second battery cell 120, and the second end of the second switch circuit 420 is electrically connected to the second pole of the second battery cell 120. The first end of the third switch circuit 430 is electrically connected to the first pole of the third battery cell 130, and the second end of the third switch circuit 430 is electrically connected to the second pole of the third battery cell 130. The first end of the fourth switch circuit 440 is electrically connected to the first pole of the fourth battery cell 140, and the second end of the fourth switch circuit 440 is electrically connected to the second pole of the fourth battery cell 140.

[0039] Taking the thermal runaway failure of the second battery cell 120 as an example for description, when the thermal runaway failure does not occur in each battery cell, each switch circuit remains in the disconnected state. The thermal runaway detection circuit 200 detects the operating parameters of each battery cell and sends the detected operating parameters to the battery management system 300. When the battery management system 300 determines that the operating parameters of the second battery cell 120 are abnormal, that is, the second battery cell 120 has a thermal runaway fault, the battery management system 300 outputs a fault signal to the control circuit 450. The control circuit 450 turns on the second switch circuit 420 corresponding to the second battery cell 120 according to the information in the fault signal, thereby short-circuiting the second battery cell 120 by the second switch circuit 420, thereby isolating the second battery cell 120 and connecting the first battery cell 110 to the third battery cell 130, that is, the first battery cell 110 and the third battery cell 130 are connected in series, thereby making the battery cells in normal working state still connected in series, and only the second battery cell 120 that has a thermal failure is short-circuited and isolated by the second switch circuit 420 and stops working, so that the battery device can maintain normal power supply. The present application detects the operating parameters of each battery cell through the thermal runaway detection circuit 200. When the battery management system 300 determines that a battery cell has a thermal runaway fault, it sends a fault signal to the control circuit 450. The control circuit 450 controls the corresponding switch circuit to short-circuit the faulty battery cell, thereby isolating the faulty battery cell from the normal battery cell, stopping the faulty battery cell from discharging externally, and the remaining battery cells maintain normal power supply. Therefore, the present application does not need to directly cut off the power supply of the entire battery device after the thermal runaway fault occurs in the battery cell. Instead, the switch circuit only stops the power supply of the faulty battery cell and isolates it, so that the remaining battery cells remain in series. Therefore, the normal power supply of the battery device can be ensured, so that the car will not lose power due to the thermal runaway fault of the battery device, and it can also avoid the problem of the temperature of the battery device rising due to the continued operation of the faulty battery cell, thereby ensuring the driving safety of the car.

[0040] It should be noted that the isolation circuit includes a first switch circuit 410, a second switch circuit 420, a third switch circuit 430 and a fourth switch circuit 440, and at least two battery cells 100 connected in series include a first battery cell 110, a second battery cell 120, a third battery cell 130 and a fourth battery cell 140 connected in series are only examples, and the specific number of switch circuits and the number of battery cells need to be set according to actual conditions and are not specifically limited here.

[0041] In some embodiments, the switch circuit includes a relay, and a control terminal of the relay is electrically connected to the control circuit.

[0042] Specifically, the relays are arranged in one-to-one correspondence with the battery cells, the first end of the relay is electrically connected to the first pole of the battery cell, and the second end of the relay is electrically connected to the second pole of the battery cell. When the battery cell is working normally, the relay remains disconnected. When the battery management system determines that a certain battery cell has a thermal runaway fault through the thermal runaway detection circuit, the battery management system sends a fault signal to the control circuit. The control circuit sends an electrical signal to the control end of the relay corresponding to the faulty single cell to turn it on according to the received fault signal, thereby short-circuiting the faulty single cell, and connecting the single cells adjacent to the faulty single cell through the turned-on relay, so that the normally working single cells in the battery device are still connected in series in sequence, and the faulty single cell is short-circuited by the turned-on relay to isolate it from other normally working single cells, thereby ensuring the normal power supply of the battery device, and the car will not cut off the power supply of the entire battery device due to the thermal runaway fault of the battery cell in the battery device, ensuring that the car will not lose power due to the thermal runaway fault of the single cell during driving, and can also avoid the problem of vehicle spontaneous combustion caused by the temperature increase of the battery device due to the continued operation of the faulty battery cell, further ensuring the driving safety of the car.

[0043] In some embodiments, the switch circuit includes a MOS transistor, and a gate of the MOS transistor is electrically connected to the control circuit.

[0044] Specifically, the MOS tubes are arranged one by one with the battery cells, the first pole of the MOS tube is electrically connected to the first pole of the battery cell, and the second pole of the MOS tube is electrically connected to the second pole of the battery cell. When the battery cell works normally, the MOS tube remains disconnected. When the battery management system determines that a battery cell has a thermal runaway fault through the thermal runaway detection circuit, the battery management system sends a fault signal to the control circuit. The control circuit sends a level signal to the gate of the MOS tube corresponding to the faulty single cell to turn it on, thereby short-circuiting the faulty single cell. The single cells adjacent to the faulty single cell are connected through the turned-on MOS tube, so that the normally functioning single cells in the battery device are still connected in series in sequence, while the faulty single cell is short-circuited by the turned-on MOS tube to isolate it from other normally functioning single cells, thereby ensuring the normal power supply of the battery device, and the car will not cut off the power supply of the entire battery device due to the thermal runaway fault of the battery cell in the battery device, ensuring that the car will not lose power due to the thermal runaway fault of the single cell during driving, and can also avoid the problem of vehicle spontaneous combustion caused by the increase in battery device temperature due to the continued operation of the faulty battery cell, further ensuring the driving safety of the car.

[0045] In some embodiments, the thermal runaway detection circuit includes: a voltage detection circuit. The voltage detection circuit is electrically connected to the battery cell and the battery management system. The voltage detection circuit is used to detect the operating voltage of the battery cell, and the battery management system is used to determine the faulty battery cell according to the operating voltage and a preset voltage range.

[0046] Specifically, when a battery cell has a thermal failure, the voltage of the battery cell will decrease abnormally due to the increase in the temperature of the battery cell. Therefore, by setting a voltage detection circuit to detect the operating voltage of each battery cell, the thermal failure of the battery cell can be detected. The voltage detection circuit detects the operating voltage of each battery cell and sends the detected operating voltage to the battery management system. The battery management system compares the operating voltage with the preset voltage range. When the voltage value of the detected operating voltage is less than the preset voltage range, it is determined that the battery cell has a thermal runaway failure. The battery management system controls the isolation circuit to isolate the faulty battery cell from the normal battery cell, and the remaining battery cells maintain normal power supply. This ensures the normal power supply of the battery device while avoiding safety problems caused by thermal runaway failures of battery cells.

[0047] In some embodiments, the thermal runaway detection circuit includes: a temperature detection circuit. The temperature detection circuit is electrically connected to a battery management system; wherein the temperature detection circuit is used to detect the operating temperature of a battery cell, and the battery management system is used to determine a faulty battery cell according to the operating temperature and a preset temperature range.

[0048] Specifically, when a battery cell has a thermal failure, the temperature of the battery cell will rise abnormally. Therefore, by setting a temperature detection circuit to detect the operating temperature of each battery cell, the thermal failure of the battery cell can be detected. The temperature detection circuit detects the operating temperature of each battery cell and sends the detected operating temperature to the battery management system. The battery management system compares the operating temperature with the preset temperature range. When the detected operating temperature is greater than the preset temperature range, it is determined that the battery cell has a thermal runaway failure. The battery management system controls the isolation circuit to isolate the faulty battery cell from the normal battery cell, and the remaining battery cells maintain normal power supply. This ensures the normal power supply of the battery device while avoiding safety problems caused by thermal runaway failures of battery cells.

[0049] In some embodiments, the thermal runaway detection circuit includes: an air pressure detection circuit. The air pressure detection circuit is electrically connected to the battery management system; wherein the air pressure detection circuit is used to detect the internal air pressure of the battery cell, and the battery management system is used to determine the faulty battery cell according to the internal air pressure and a preset air pressure range.

[0050] Specifically, when a battery cell has a thermal failure, the temperature of the battery cell will rise, so the internal air pressure of the battery cell will increase with the increase in temperature. Therefore, by setting up an air pressure detection circuit to detect the internal air pressure of each battery cell, the thermal failure of the battery cell can be detected. The air pressure detection circuit detects the internal air pressure of each battery cell and sends the detected internal air pressure to the battery management system. The battery management system compares the internal air pressure with the preset air pressure range. When the detected internal air pressure is greater than the preset air pressure range, it is determined that the battery cell has a thermal runaway failure. The battery management system controls the isolation circuit to isolate the faulty battery cell from the normal battery cell, and the remaining battery cells maintain normal power supply. This ensures the normal power supply of the battery device while avoiding safety problems caused by thermal runaway failures of battery cells.

[0051] In some embodiments, the electrical device further includes a prompt circuit; the prompt circuit is electrically connected to the battery management system, and the prompt circuit is used to issue a prompt message according to the fault signal.

[0052] Exemplarily, the battery management system will generate a fault signal after determining that a battery cell has a thermal failure. The prompt circuit will send a prompt message after receiving the fault signal. The prompt message includes, for example, sound alarm information, light alarm information, etc. The vehicle user can determine that a battery cell in the vehicle battery device has a thermal runaway failure based on the prompt message, and choose to stop driving the vehicle to prevent safety problems caused by further vehicle failures.

[0053] The present application also provides an electrical device, comprising at least one battery device as described in the above embodiment.

[0054] It can be understood that the electrical device provided in the embodiment of the present application can achieve the corresponding beneficial effects of the battery device provided in the above-mentioned embodiment, which will not be elaborated here.

[0055] It should be noted that, in this article, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device. In the absence of further restrictions, the elements defined by the sentence "comprise a ..." do not exclude the existence of other identical elements in the process, method, article or device including the elements.

[0056] The above is only a specific implementation of the present application, so that those skilled in the art can understand or implement the present application. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein can be implemented in other embodiments without departing from the spirit or scope of the present application. Therefore, the present application will not be limited to these embodiments herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A battery device, characterized in that: include: At least two battery cells connected in series; A thermal runaway detection circuit, electrically connected to the battery cell, and used to detect operating parameters of the battery cell; A battery management system, connected to the thermal runaway detection circuit, for determining a faulty battery cell from the plurality of battery cells according to the operating parameters, and outputting a fault signal; An isolation circuit is electrically connected to the battery cell, and is used to isolate the faulty battery cell according to the fault signal.

2. The battery device according to claim 1, characterized in that: The isolation circuit comprises: At least two switch circuits, the switch circuits being electrically connected to the battery cells in a one-to-one correspondence, and the switch circuits being used to short-circuit the battery cells; A control circuit is electrically connected to the control end of the switch circuit, and the control circuit is used to control the switch circuit to be turned on according to the fault signal.

3. The battery device according to claim 2, characterized in that: The first end of the switch circuit is connected to the first pole of the corresponding battery cell, and the second end of the switch circuit is connected to the second pole of the corresponding battery cell.

4. The battery device according to claim 2, characterized in that: The switch circuit comprises a relay, and a control end of the relay is electrically connected to the control circuit.

5. The battery device according to claim 2, characterized in that: The switch circuit includes a MOS tube, and a gate of the MOS tube is electrically connected to the control circuit.

6. The battery device according to claim 1, characterized in that: The thermal runaway detection circuit comprises: A voltage detection circuit; the voltage detection circuit is electrically connected to the battery cell and the battery management system; The voltage detection circuit is used to detect the operating voltage of the battery cell, and the battery management system is used to determine the faulty battery cell according to the operating voltage and a preset voltage range.

7. The battery device according to claim 1, characterized in that: The thermal runaway detection circuit comprises: A temperature detection circuit; the temperature detection circuit is electrically connected to the battery management system; The temperature detection circuit is used to detect the operating temperature of the battery cell, and the battery management system is used to determine the faulty battery cell according to the operating temperature and a preset temperature range.

8. The battery device according to claim 1, characterized in that: The thermal runaway detection circuit comprises: Air pressure detection circuit; the air pressure detection circuit is electrically connected to the battery management system; The air pressure detection circuit is used to detect the internal air pressure of the battery cell, and the battery management system is used to determine the faulty battery cell according to the internal air pressure and a preset air pressure range.

9. The battery device according to claim 1, characterized in that: The battery device further comprises a prompt circuit; the prompt circuit is electrically connected to the battery management system, and the prompt circuit is used to issue a prompt message according to the fault signal.

10. An electrical device, characterized in that: Comprising at least one battery device according to any one of claims 1 to 9.

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