Power battery system

Abstract

The utility model provides a power battery system, and relates to the technical field of batteries. The power battery system comprises N power supply branches, a cut-off switch and a BMS master controller, the N power supply branches are connected in parallel, the power supply branches are used for driving a load to work, each power supply branch comprises a first switch, a battery pack and a second switch which are connected in series, the first switch and the second switch are magnetic latching switches, and N is an integer greater than or equal to 2; the cut-off switch is connected in series to a loop where the load is located and used for cutting off load power supply; and the BMS master controller is used for controlling the on and off of the first switch and the second switch. According to the invention, the plurality of power supply branches supply power to the load in parallel, thereby ensuring the reliability of power supply to the load. According to the invention, low-voltage power failure and high-voltage power self-holding can be realized, the reliability and safety of the power battery system are improved, and the requirements of loads with high safety and reliability requirements are met.

Description

Technical Field

[0001] The present disclosure relates to the field of battery technology, and in particular to a power battery system. Background Art

[0002] With the continuous introduction of new materials, processes and manufacturing technologies, the performance of batteries such as lithium batteries has been significantly improved, and the safety, energy density and discharge capacity of batteries have been continuously improved, and aviation-grade batteries have emerged. However, the existing power battery system cannot meet the requirements of loads with high safety and reliability requirements.

[0003] How to improve the safety and reliability of power battery systems is an urgent problem to be solved.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The present disclosure provides a power battery system, which improves the safety and reliability of the power battery system to at least a certain extent.

[0006] Other features and advantages of the present disclosure will become apparent from the following detailed description, or may be learned in part by the practice of the present disclosure.

[0007] According to one aspect of the present disclosure, a power battery system is provided, comprising: N power supply branches, the N power supply branches are connected in parallel, the power supply branches are used to drive a load to work, wherein the power supply branches include a first switch, a battery pack, and a second switch connected in series, the first switch and the second switch are both magnetic holding switches, and N is an integer greater than or equal to 2; a disconnect switch, the disconnect switch is connected in series to a loop where the load is located, and is used to cut off power supply to the load; a battery management system BMS main control, the BMS main control is used to control the opening and closing of the first switch and the second switch.

[0008] In one embodiment of the present disclosure, the power battery system further includes: N pre-charging branches, the N pre-charging branches correspond one-to-one to the N power supply branches, and the pre-charging branches are connected in parallel to the second switch of the power supply branch; the pre-charging branch includes a pre-charging resistor and a third switch, the pre-charging resistor and the third switch are connected in series, wherein the opening and closing of the third switch is controlled by the BMS master control.

[0009] In one embodiment of the present disclosure, a Hall sensor is connected in series to the power supply branch, the Hall sensor is coupled to the BMS main control, and the BMS main control is coupled to the controller of the load.

[0010] In one embodiment of the present disclosure, a first voltage collector is connected between the battery pack and the second switch on each of the power supply branches, a second voltage collector is connected to one end of the power supply branch, and a third voltage collector is connected to the other end, the first voltage collector, the second voltage collector and the third voltage collector are all coupled to the BMS main control, and the BMS main control is coupled to the controller of the load.

[0011] In one embodiment of the present disclosure, the power battery system further includes N battery boxes, the battery boxes correspond one-to-one to the battery packs, and the battery packs on the power supply branches are located in the battery boxes.

[0012] In one embodiment of the present disclosure, a fire detector and a BMS slave control are installed in the battery box, and both the fire detector and the BMS slave control are coupled to the BMS master control.

[0013] In one embodiment of the present disclosure, both the first switch and the second switch are magnetic latching contactors, and the disconnect switch is a circuit breaker.

[0014] In one embodiment of the present disclosure, state detection sensors are installed on the auxiliary contacts of the first switch and the second switch, and the state detection sensors are coupled to the BMS main control.

[0015] In one embodiment of the present disclosure, the power battery system further includes an alarm system, and the alarm system is coupled to the BMS master control.

[0016] In one embodiment of the present disclosure, the load is an aircraft.

[0017] The power battery system provided in the embodiment of the present disclosure includes N power supply branches, a disconnect switch and a BMS main control. The N power supply branches are connected in parallel, and the power supply branches are used to drive the load to work, wherein the power supply branch includes a first switch, a battery pack and a second switch connected in series, and the first switch and the second switch are both magnetic holding switches, and N is an integer greater than or equal to 2; the disconnect switch is connected in series in the circuit where the load is located, and is used to cut off the power supply to the load; the BMS main control is used to control the opening and closing of the first switch and the second switch. The present disclosure supplies power to the load in parallel through multiple power supply branches, thereby ensuring the reliability of power supply to the load. The first switch and the second switch of the present disclosure are both magnetic holding switches, and are controlled to open and close by the BMS main control. The disconnect switch is connected in series in the circuit where the load is located, thereby realizing low-voltage power-off and high-voltage power self-maintenance, improving the reliability and safety of the power battery system, and thus meeting the requirements of loads with high safety and reliability requirements.

[0018] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0020] Figure 1 A schematic structural diagram of a power battery system in an embodiment of the present disclosure is shown.

[0021] Figure 2 The internal structure diagram of the magnetic holding switch is shown.

[0022] Figure 3 A schematic structural diagram of a power battery system in another embodiment of the present disclosure is shown.

[0023] Figure 4 A schematic structural diagram of a power battery system in another embodiment of the present disclosure is shown.

[0024] Figure 5 A schematic structural diagram of a power battery system in another embodiment of the present disclosure is shown.

[0025] Figure 6 A schematic structural diagram of a power battery system in another embodiment of the present disclosure is shown.

[0026] Figure 7 A connection diagram of a BMS slave control, a fire detector and a BMS master control in an embodiment of the present disclosure is shown.

[0027] Figure 8 A schematic structural diagram of a power battery system in another embodiment of the present disclosure is shown. DETAILED DESCRIPTION

[0028] Example embodiments will now be described more fully with reference to the accompanying drawings. However, example embodiments can be implemented in a variety of forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that the disclosure will be more comprehensive and complete and to fully convey the concepts of the example embodiments to those skilled in the art. The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

[0029] In addition, the accompanying drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale. The same reference numerals in the figures represent the same or similar parts, and their repeated description will be omitted. Some of the block diagrams shown in the accompanying drawings are functional entities and do not necessarily correspond to physically or logically independent entities. These functional entities can be implemented in software form, or implemented in one or more hardware modules or integrated circuits, or implemented in different networks and / or processor devices and / or microcontroller devices.

[0030] It should be noted that the concepts such as "first" and "second" mentioned in the present disclosure are only used to distinguish different devices, modules or units, and are not used to limit the order or interdependence of the functions performed by these devices, modules or units.

[0031] It should be noted that the modifications of "one" and "plurality" mentioned in the present disclosure are illustrative rather than restrictive, and those skilled in the art should understand that unless otherwise clearly indicated in the context, it should be understood as "one or more".

[0032] The embodiments of the present disclosure are described with the load being an aircraft and the battery being a lithium battery, but the embodiments of the present disclosure are not limited thereto.

[0033] Manned electric aircraft have very high requirements for power supply reliability. During the flight, the aircraft must ensure that the power battery system cannot be disconnected no matter what happens to ensure flight safety.

[0034] With the continuous introduction of new materials, processes and manufacturing technologies, the performance of lithium batteries has been significantly improved. The safety, energy density and discharge capacity of lithium batteries have been continuously improved, and aviation-grade lithium batteries have emerged. Lithium batteries are widely used in the field of new energy vehicles, but are less used in the aircraft field. The aviation field has extremely high requirements for system safety. Power batteries replace aircraft engines. The existing on-board power battery system solutions cannot meet the safety requirements of aviation systems.

[0035] Based on this, the present disclosure provides a power battery system, which improves the reliability and safety of the aviation power battery system from the perspective of system multi-backup design and low-voltage power-off high-voltage power self-maintenance system. The present disclosure can be applied to power supply scenarios of power supply systems. Specifically, the present disclosure can be applied to power supply systems for large loads such as aircraft (such as manned electric aircraft) and high-speed railways. The present disclosure can also be applied to aircraft or aircraft using power batteries, but the present disclosure is not limited thereto.

[0036] The present exemplary implementation is described in detail below with reference to the accompanying drawings and embodiments.

[0037] In an exemplary embodiment, if Figure 1As shown, a power battery system is provided in an embodiment of the present disclosure, including N power supply branches 11, a disconnect switch 12 and a battery management system BMS master control (not shown in FIG. Figure 1 As shown in the figure, N power supply branches 11 are connected in parallel, and the power supply branch 11 is used to drive the load to work, wherein the power supply branch 11 may include a first switch 111, a battery pack 112, and a second switch 113 connected in series, the first switch 111 and the second switch 113 are both magnetic holding switches, and N is an integer greater than or equal to 2; the disconnect switch 12 is connected in series to the loop where the load is located, and is used to cut off the power supply to the load; the BMS master is used to control the opening and closing of the first switch 111 and the second switch 113.

[0038] In the embodiment of the present disclosure, the first switch 111 and the second switch 113 are both magnetic latching switches, which are used to maintain the current state when the BMS main control is powered off at low voltage, thereby keeping the load working safely. The embodiment of the present disclosure does not limit what kind of switch the magnetic latching switch is. For example, the magnetic latching switch can be a magnetic circuit breaker or a magnetic latching contactor.

[0039] For example, the first switch 111 and the second switch 113 are both magnetic latching contactors. Figure 2 As shown. The first switch (also called the main negative switch) 111 and the second switch (also called the main positive switch) 113 are both magnetic latching contactors, which have a closing coil and an opening coil. The magnetic latching contactors are driven by electrical signals to operate, and can maintain the current state when the low voltage is powered off. In the flight state, when the low voltage system of the aircraft has power failures and other problems, the high voltage branch maintains power supply, thereby improving system safety.

[0040] In the disclosed embodiment, each power supply branch 11 is configured with a first switch and a second switch. When a single switch (such as the first switch) fails, the power supply branch can be cut off by another switch (such as the second switch), thereby further improving the reliability of the power battery system.

[0041] In the embodiment of the present disclosure, the disconnect switch 12 can be a switch that can be manually controlled to cut off the power supply to the load. For example, the disconnect switch 12 can be a circuit breaker (such as an emergency stop circuit breaker), a safety relay, or other switch that can be manually controlled to cut off the power supply.

[0042] In the embodiment of the present disclosure, the disconnect switch 12 cooperates with the magnetic holding switch (the first switch 111 and the second switch 113). When the low voltage power that controls the opening and closing of the first switch 111 and the second switch 113 is abnormally powered off, the magnetic holding switch can maintain the current state when the low voltage is powered off, thereby ensuring the normal operation of the load. When the load needs to stop working, the disconnect switch 12 is disconnected to power off the load, thereby realizing the self-maintenance of high voltage power when the low voltage is powered off, improving the reliability and safety of the power battery system, and thus meeting the requirements of loads with high safety and reliability requirements.

[0043] Exemplarily, the aircraft control system is equipped with a manually operable emergency stop circuit breaker, and in an emergency, the pilot can cut off the high-voltage branch circuit through the emergency stop circuit breaker.

[0044] In the embodiment of the present disclosure, there are multiple power supply branches 11, and the multiple power supply branches 11 can work independently or in parallel. When one or more battery packs fail, other battery packs supply power normally, thereby ensuring uninterrupted power supply to the load. It should be noted that when a battery pack fails, the BMS master control can cut off the faulty branch by cutting off the first switch or the second switch on the power supply branch where the faulty battery pack is located, thereby ensuring normal power supply to the load.

[0045] In the embodiments of the present disclosure, there is no limitation on the value of N, and it can be set according to the actual application scenario and specific application experience. For example, the value range of N is any value in the range of 2-20. For example, N can be any value in the range of 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19 and 20.

[0046] Illustratively, there are two power supply branches 11 in the embodiment of the present disclosure, and the two power supply branches 11 can work independently or in parallel.

[0047] In the embodiments of the present disclosure, the specific type of equipment that the load is does not specifically limit the embodiments of the present disclosure. For example, the load is an airplane. For another example, the load is transportation equipment (such as a high-speed train, a subway, etc.).

[0048] The embodiment of the present disclosure supplies power to the load through multiple power supply branches in parallel, thereby ensuring the reliability of power supply to the load. The first switch and the second switch of the present disclosure are both magnetic latching switches, and are switched on and off by the BMS master control, and the switch is connected in series on the circuit where the load is located, thereby achieving low-voltage power-off and high-voltage power self-maintenance, improving the reliability and safety of the power battery system, and thus meeting the requirements of loads with high safety and reliability requirements.

[0049] The present disclosure is described below through six exemplary embodiments.

[0050] In an exemplary embodiment, if Figure 3 As shown, the power battery system may further include: N pre-charging branches 13, the N pre-charging branches 13 correspond one-to-one to the N power supply branches 11, and the pre-charging branch 13 is connected in parallel to the second switch 113 of the power supply branch; the pre-charging branch 13 may include a pre-charging resistor 131 and a third switch 132, the pre-charging resistor 131 and the third switch 132 are connected in series, wherein the opening and closing of the third switch 132 is controlled by the BMS master control.

[0051] In the embodiment of the present disclosure, the embodiment of the present disclosure does not specifically limit what kind of switch the third switch 132 is, as long as it can realize weak current control of strong current. For example, the third switch 132 can be a contactor or a relay.

[0052] It should be noted that if Figure 3 As shown, when the battery packs 112 are connected in parallel to supply power, there will be a problem of system circulation. The present disclosure can solve the problem of system circulation by connecting the pre-charging branch 13 in parallel to the second switch 113, thereby further ensuring the reliability of the power battery system.

[0053] In another exemplary embodiment, Figure 4 As shown, a Hall sensor 14 is connected in series to the power supply branch 11 , the Hall sensor 14 is coupled to the BMS main control, and the BMS main control is coupled to the controller of the load.

[0054] Exemplarily, one or more Hall sensors 14 are installed on each power supply branch 11. The Hall sensor 14 is used to collect the current on the power supply branch 11 and report the collected current to the BMS main control system. The BMS main control reports the system discharge or charging current to the load controller (for example, the flight controller).

[0055] Exemplarily, the BMS master controls power on and off the system according to instructions from the aircraft controller.

[0056] The disclosed embodiment can determine whether the power battery system is in the process of discharging or charging according to the current collected by the Hall sensor 14, so as to facilitate the replacement of the control load. In addition, according to the collected current, it can also be determined whether there is an abnormality, so as to disconnect the power supply branch with the abnormality, thereby improving the safety and reliability of the system.

[0057] It should be noted that each power supply branch 11 of the present disclosure is equipped with a first switch 111 and a second switch 113. When an abnormality occurs in the branch, the first switch 111 and / or the second switch 113 can be cut off to disconnect the branch, and power is supplied through other power supply branches 11. When a pre-charging branch 13 is connected in parallel to the power supply branch 11, the power supply branch 11 can also be disconnected by cutting off the third switch 132 on the pre-charging branch 13.

[0058] In another exemplary embodiment, a first voltage collector is connected between the battery pack and the second switch on each power supply branch, a second voltage collector is connected to one end of the power supply branch, and a third voltage collector is connected to the other end, the first voltage collector, the second voltage collector and the third voltage collector are all coupled to a BMS main control, and the BMS main control is coupled to a controller of the load.

[0059] For example, Figure 5 As shown, a first voltage collection branch HV+1 is connected between the battery pack 112 and the second switch 113 on each power supply branch 11 (for example, voltage collection is achieved through a first voltage collector), and the two ends of the power supply branch 11 are respectively connected to a second voltage collection branch HV+2 (for example, voltage collection is achieved through a second voltage collector) and a third voltage collection branch HV- (for example, voltage collection is achieved through a third voltage collector).

[0060] The embodiment of the present disclosure can determine the system circuit of the power battery system through the first voltage collector, the second voltage collector and the third voltage collector, and judge whether the pre-charging is successful according to the voltage.

[0061] In the embodiment of the present disclosure, the first voltage collector, the second voltage collector and the third voltage collector are not limited in specific devices. For example, the first voltage collector, the second voltage collector and the third voltage collector can all be devices such as voltage sensors, Hall sensors, etc. for collecting voltage.

[0062] Exemplarily, when the voltage collected by the first voltage collection branch HV+1 and the second voltage collection branch HV+2 of each power supply branch is the same, it indicates that the voltage pre-charging is successful.

[0063] The disclosed embodiment determines the system voltage of the power battery system through the first voltage collector, the second voltage collector and the third voltage collector, and transmits the collected voltage value to the controller of the load through the BMS main control, so as to determine whether the pre-charging is successful, thereby further improving the safety and reliability of the system.

[0064] It should be noted that the present disclosure can also determine whether there is a fault in the power supply branch by the voltage value of the collected voltage. If there is a fault (for example, the voltages of HV+1 and HV- are the same), the switch in the faulty power supply branch will be disconnected to ensure that the power battery system is safely and reliably powered.

[0065] In yet another exemplary embodiment, the power battery system may further include N battery boxes, where the battery boxes correspond one to one with the battery packs, and the battery packs on the power supply branches are located in the battery boxes.

[0066] In the disclosed embodiment, the battery box is helpful for protecting the battery pack. When a battery pack in the battery box fails, the BMS main control can disconnect the power supply branch of the circuit, remove the faulty branch, and the normal branch continues to work.

[0067] In the embodiments of the present disclosure, there is no limitation on what kind of battery box the battery box is. For example, the battery box may be an explosion-proof battery box, a heat-insulating battery box, a heat-dissipating battery box, an explosion-proof heat-insulating battery box, or an explosion-proof heat-dissipating battery box.

[0068] In the present disclosure, Figure 6 As shown, in order to further improve the safety of the system, a fuse FU can be connected in series with the battery pack 112. The fuse FU can also be located in the battery box. In the embodiment of the present disclosure, the battery box is a separate box. In addition, if the battery pack is installed in the box, the box with the battery pack installed can also be called a battery box (equivalent to the battery box with the battery pack installed in the present disclosure).

[0069] In yet another exemplary embodiment, a fire detector and a BMS slave control are installed in the battery box, and both the fire detector and the BMS slave control are coupled to the BMS master control.

[0070] In a BMS, a "BMS slave" may be a slave controller or module that is used to perform specific monitoring, protection and control tasks. In the disclosed embodiment, the BMS slave is used to detect the cell voltage and cell temperature of the battery pack in the battery box.

[0071] For example, Figure 7 As shown, the power battery system includes two power supply branches. The battery box 1 of the first power supply branch is equipped with a BMS slave control 1 and a fire detector 1, and the battery box 2 of the other power supply branch is equipped with a BMS slave control 2 and a fire detector 2. The BMS slave control 1, the fire detector 1, the BMS slave control 2 and the fire detector 2 are all coupled to the BMS master control.

[0072] BMS slave control 1 and fire detector 1 detect the cell voltage, cell temperature and fire information (CO (carbon monoxide), temperature, H2 (hydrogen), VOC (volatile organic compounds), etc.) of the battery pack in battery box 1 and report them to the BMS master control via CAN communication (a serial communication protocol), and the BMS master control reports the information to the aircraft controller. BMS slave control 2 and fire detector 2 detect the cell voltage, cell temperature and fire information (CO, temperature, H2, VOC, etc.) of the battery pack in battery box 2 and report them to the BMS master control via CAN communication, and the BMS master control reports the information to the aircraft controller.

[0073] It should be noted that a battery pack may include multiple battery cells, where the single cell voltage is used to indicate the battery cell voltage, and the single cell temperature is used to indicate the battery cell temperature.

[0074] In one embodiment, the power battery system further includes an alarm system, and the alarm system is coupled to the BMS main control.

[0075] In the embodiments of the present disclosure, the specific device of the alarm system is not limited, as long as it can realize the alarm notification to inform the staff of the situation. For example, the alarm system can be a combination of one or more of an audible and visual alarm, a smoke alarm, a temperature alarm, and a gas leak alarm.

[0076] The disclosed embodiment detects the situation in the battery box through the BMS slave control. Once the alarm condition is reached (for example, the concentration of CO in the battery box is greater than 24 mg / m 3 (mg / m3)) cuts off the current of the power supply branch and issues an alarm through the alarm system, thereby further improving the safety and reliability of the power battery system.

[0077] In yet another exemplary embodiment, state detection sensors are installed on auxiliary contacts of the first switch and the second switch, and the state detection sensors are coupled to the BMS main control.

[0078] Exemplarily, the first switch is a main negative contactor, and the second switch is a main positive contactor, such as Figure 2 As shown, the BMS main control detects the current contactor status through the auxiliary contacts B1-B2 of the main positive contactor or the main negative contactor, and reports the information to the aircraft controller.

[0079] In the embodiments of the present disclosure, the state detection sensor is not limited to any specific sensor, as long as it can detect whether the switch is in a closed state or an open state. For example, the state detection sensor can be a micro switch, a photoelectric sensor, or other types of mechanical sensors.

[0080] It should be noted that the third switch may also detect the state of the auxiliary contact through a state detection sensor to determine the state of the third switch.

[0081] The disclosed embodiment detects the state of the switch through a state detection sensor, so that when a power supply branch fails due to a switch, the failed power supply branch can be cut off by cutting off another switch, thereby ensuring that the power battery system operates normally, thereby further improving the safety and reliability of the system.

[0082] The present disclosure is described below through a specific embodiment.

[0083] In one embodiment, if Figure 8As shown, a power battery system may include: 2 power supply branches 11, the 2 power supply branches 11 are connected in parallel, the power supply branch 11 is used to drive the load to work, wherein the power supply branch 11 includes a first switch 111, a battery pack 112 and a second switch 113 connected in series, the first switch 111 and the second switch 113 are both magnetic holding switches; a disconnect switch 12, the disconnect switch 12 is connected in series to the circuit where the load is located, and is used to cut off the power supply to the load; a battery management system BMS main control, the BMS main control is used to control the opening and closing of the first switch 111 and the second switch 113. It should be noted that the load can be connected in series with the disconnect switch 12 as shown in the figure. Figure 8 As shown, the load is powered by two parallel power supply branches 11 between the positive and negative electrodes. Exemplarily, both the first switch and the second switch are magnetic latching contactors, and the disconnect switch is an emergency stop circuit breaker. The load is an aircraft.

[0084] The power battery system may also include: 2 pre-charging branches 13, the 2 pre-charging branches 13 correspond to the 2 power supply branches 11 one by one, and the pre-charging branch 13 is connected in parallel to the second switch 113 of the power supply branch 11; the pre-charging branch 13 includes a pre-charging resistor 131 and a third switch 132, the pre-charging resistor 131 and the third switch 132 are connected in series, wherein the opening and closing of the third switch 132 is controlled by the BMS master control. It should be noted that the BMS master control refers to the core control unit in the battery management system, which is used to monitor and manage the status, performance and safety of the battery pack. The power battery system may also include an alarm system, which is coupled to the BMS master control.

[0085] A first voltage collector is connected between the battery pack 112 and the second switch 113 on each power supply branch 11, a second voltage collector is connected to one end of the power supply branch, and a third voltage collector is connected to the other end. The first voltage collector, the second voltage collector and the third voltage collector are all coupled to the BMS main control, and the BMS main control is coupled to the controller of the load.

[0086] The power battery system may also include two battery boxes, the battery boxes correspond to the battery packs one by one, and the battery packs on the power supply branch are located in the battery boxes. Among them, the battery box is equipped with a fire detector and a BMS slave control, and the fire detector and the BMS slave control are coupled to the BMS master control.

[0087] A state detection sensor is installed on the auxiliary contacts of the first switch and the second switch, and the state detection sensor is coupled to the BMS main control.

[0088] A Hall sensor 14 is connected in series to the power supply branch 11. The Hall sensor 1 is coupled to the BMS main control, and the BMS main control is coupled to the controller of the load. It should be noted that the BMS main control is coupled to the controller of the load to facilitate data exchange between the two. The controller of the load learns the data collected by the battery management system for safety judgment, and issues an alarm through the alarm system when an abnormality occurs.

[0089] It should be noted that the solutions of vehicle-mounted power battery systems in related technologies cannot meet the safety requirements of aviation systems. The present disclosure adopts a dual-branch design, with two systems backing up each other, and can work in parallel or independently, with a low-voltage power-off and high-voltage power self-maintaining system, which improves the safety and reliability of aviation power battery systems.

[0090] To sum up, the present invention adopts two battery systems (power supply branches) and a dual backup system design. The present invention adopts two battery boxes that can work independently and in parallel. In order to solve the system circulation problem when working in parallel, pre-charging systems are set for both branches.

[0091] The present invention provides an emergency stop circuit breaker on the aircraft control system side, and in an emergency state, the pilot can manually operate the emergency stop circuit breaker to cut off the high-voltage branch circuit.

[0092] The disclosed system is equipped with an alarm system. In addition to uploading battery failure or fire to the aircraft controller, the BMS can directly trigger the sound and light alarm system.

[0093] The first switch and the second switch contactor of the present invention adopt a magnetic holding contactor. The magnetic holding contactor has a closing coil and an opening coil. The contactor is driven to operate by an electrical signal and can maintain the current state when the low voltage is powered off. During flight, when the low voltage system of the aircraft has power failure or other problems, the high voltage branch maintains power supply, thereby improving system safety.

[0094] An embodiment of the present disclosure also provides an onboard power supply system, comprising a power battery system as provided by any technical solution in the above exemplary embodiments.

[0095] In the disclosed embodiments, the onboard power system may refer to a system on an aircraft that is used to provide power to various devices and systems. In addition to the power battery system, the onboard power system may also include a main generator, an auxiliary power unit (APU), a static inverter, and a power distribution system. The onboard power system is a vital system on an aircraft. It provides the required power support for various devices on the aircraft, ensuring the normal operation and flight safety of the aircraft.

[0096] It should be clear that each embodiment in this specification is described in a progressive manner, and the same or similar parts between the embodiments can be referred to each other, and each embodiment focuses on the differences from other embodiments. The present disclosure is not limited to the specific structures described above and shown in the figures. Those skilled in the art can make various changes, modifications and additions after understanding the spirit of the present disclosure. In addition, for the sake of brevity, a detailed description of the known technology is omitted here.

[0097] In the several embodiments provided in the present disclosure, it should be understood that the disclosed circuits and devices can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some ports, devices or units, which can be electrical, mechanical or other forms.

[0098] The above description is only a specific implementation mode of the present disclosure, but the protection scope of the present disclosure is not limited thereto. Any technician familiar with the technical field can easily think of changes or substitutions within the technical scope disclosed in the present disclosure, which should be included in the protection scope of the present disclosure.

[0099] Therefore, the protection scope of the present disclosure shall be based on the protection scope of the claims. The present disclosure is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary technical means in the technical field not disclosed in the present disclosure. The description and examples are to be regarded as exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A power battery system, characterized in that: include: N power supply branches, the N power supply branches are connected in parallel, and the power supply branches are used to drive a load to work, wherein the power supply branches include a first switch, a battery pack, and a second switch connected in series, the first switch and the second switch are both magnetic latching switches, and N is an integer greater than or equal to 2; A disconnect switch, which is connected in series to the circuit where the load is located and is used to cut off the power supply to the load; A battery management system BMS master control is used to control the opening and closing of the first switch and the second switch.

2. The power battery system according to claim 1, characterized in that: The power battery system further includes: N pre-charging branches, the N pre-charging branches correspond one to one to the N power supply branches, and the pre-charging branches are connected in parallel to the second switches of the power supply branches; The pre-charging branch includes a pre-charging resistor and a third switch, wherein the pre-charging resistor and the third switch are connected in series, wherein the opening and closing of the third switch are controlled by the BMS master control.

3. The power battery system according to claim 1, characterized in that: A Hall sensor is connected in series to the power supply branch, the Hall sensor is coupled to the BMS main control, and the BMS main control is coupled to the controller of the load.

4. The power battery system according to claim 1, characterized in that: A first voltage collector is connected between the battery pack and the second switch on each power supply branch, a second voltage collector is connected to one end of the power supply branch, and a third voltage collector is connected to the other end, the first voltage collector, the second voltage collector and the third voltage collector are all coupled to the BMS main control, and the BMS main control is coupled to the controller of the load.

5. The power battery system according to claim 1, characterized in that: The power battery system further includes N battery boxes, each of which corresponds to the battery packs one by one, and the battery packs on the power supply branches are located in the battery boxes.

6. The power battery system according to claim 5, characterized in that: A fire detector and a BMS slave control are installed in the battery box, and both the fire detector and the BMS slave control are coupled to the BMS master control.

7. The power battery system according to claim 1, characterized in that: The first switch and the second switch are both magnetic latching contactors, and the disconnecting switch is a circuit breaker.

8. The power battery system according to claim 7, characterized in that: A state detection sensor is installed on the auxiliary contacts of the first switch and the second switch, and the state detection sensor is coupled to the BMS main control.

9. The power battery system according to any one of claims 1 to 8, characterized in that: The power battery system further includes an alarm system, which is coupled to the BMS main control.

10. The power battery system according to claim 9, characterized in that: The load is an aircraft.

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