CN-115610674-B - Battery management system with multiple backup communication hosts and aircraft

CN115610674BCN 115610674 BCN115610674 BCN 115610674BCN-115610674-B

Abstract

The invention provides a battery management system with multiple backup communication hosts and an aircraft, which relate to the technical field of unmanned aircrafts, wherein the battery management system is provided with multiple independent power battery assemblies, adopts the design of the multiple backup communication hosts, considers the failure probability of hardware and redundancy margin, and part of battery management units are selected from all the battery management units to serve as backup storage communication hosts, so that the fault tolerance and reliability of the aircraft in communication are improved, the aircraft is ensured to reliably acquire battery data required by safe flight, the reliability of power management of the aircraft is improved, and the flight safety of the aircraft is ensured.

Inventors

HU HUAZHI
CHEN KENZHEN

Assignees

亿航智能设备（广州）有限公司

Dates

Publication Date: 20260505
Application Date: 20220915

Claims (9)

1. The battery management system with multiple backup communication hosts is characterized by comprising N sets of power battery assemblies connected in parallel, wherein N sets of power battery assemblies connected in parallel are provided with N battery management units, M battery management units are used as backup storage communication hosts, M is less than N, the ID of each battery management unit is used as a priority setting standard of each backup storage communication host, if the current communication host fails, among the M battery management units, the battery management unit with the minimum ID of each battery management unit is selected as a new communication host, and each backup storage communication host can forward data of the N sets of power battery assemblies connected in parallel to a complete machine ALLCAN network; Each power battery assembly comprises a battery management unit, a battery protection assembly and a power battery pack, wherein the battery protection assembly comprises a fuse FU, a Hall current sensor H and a relay K, a coil terminal of the relay K is connected with the battery management unit, and the battery management unit controls the on-off of the coil terminal of the relay K according to a received CAN communication instruction so as to control whether the power battery assembly in which the battery management unit is positioned participates in the charge and discharge state of an aircraft; Each battery management unit is provided with three CAN interfaces, a first CAN interface CAN1 in the three CAN interfaces is a hardware debugging port, a second CAN interface CAN2 in the three CAN interfaces is connected with a CAN2 network, N sets of power battery components of the aircraft form a CAN network in the battery management system, and a third CAN interface CAN3 in the three CAN interfaces is communicated with external equipment and is connected with a complete machine ALLCAN network.
2. The battery management system with multiple backup communication hosts according to claim 1, wherein in each power battery assembly, the negative end of the power battery pack is connected to the positive pole of the aircraft bus, the positive end of the power battery pack is connected to one end of the fuse FU, the other end of the fuse FU passes through the middle hole of the hall current sensor H and is connected to the first contact of the relay K, the second contact of the relay K is connected to the negative pole of the aircraft bus, and the signal acquisition line of the hall current sensor H is connected to the battery management unit to realize real-time current detection.
3. The battery management system with multiple backup communication hosts according to claim 2, wherein when a loop in which the power battery pack is located is faulty or abnormal, the loop current rises, and when the loop current rises to a fusing threshold of the fuse FU, the fuse FU automatically fuses and the loop opens.
4. The battery management system with multiple backup communication hosts of claim 2, wherein each battery management unit collects and manages data of its power battery assembly and communicates the data, including voltage, current, temperature, SOC state and differential pressure.
5. The battery management system with multiple backup communication hosts according to claim 1, wherein among the M battery management units as backup storage communication hosts, the smaller the battery management unit ID is, the higher the priority of the battery management unit ID is.
6. The battery management system with multiple backup communication hosts of claim 1, wherein the power battery pack is comprised of lithium ion polymer cells.
7. The battery management system with multiple backup communication hosts according to claim 6, wherein the pack housing structure of the power battery pack is reinforced by a 1.0mm thick fireproof glass fiber plate, and a temperature sensor is built in, and the power battery pack is installed inside the chassis of the aircraft and is flexibly fixed.
8. A backup storage method for a communication host, wherein the method is used for realizing the selection of the backup storage communication host in the battery management system with multiple backup communication hosts according to claim 1, and the method comprises the following steps: S1, setting a battery management unit ID in a battery management system; S2, taking the size of the battery management unit ID as a priority setting standard of a backup reserve communication host, wherein the smaller the battery management unit ID is, the higher the priority of the battery management unit ID is; s3, confirming whether a current communication host in the battery management system fails, and if the current communication host fails, selecting a battery management unit with the minimum battery management unit ID as a new communication host from M battery management units; s4, the new communication host forwards data of the N sets of power battery assemblies connected in parallel to a whole machine ALLCAN network.
9. An aircraft, wherein the aircraft is provided with the battery management system with the multi-backup communication host according to any one of claims 1-7.

Description

Battery management system with multiple backup communication hosts and aircraft Technical Field The invention relates to the technical field of unmanned aircrafts, in particular to a battery management system with multiple backup communication hosts and an aircraft. Background The existing electric multi-rotor aircraft generally has only one battery or a plurality of batteries, and a group of battery packs formed by connecting the plurality of batteries in series or in parallel can be used as a power supply required by flight. When a group of battery packs is formed by connecting a plurality of batteries in series, if any one of the batteries has a short circuit fault, the whole battery pack stops providing electric energy to the outside, so that the whole aircraft loses power and cannot fly normally, and when the fire disaster is more serious, fire disaster can be instantaneously caused, so that the aircraft burns and crashes, and the aircraft can be prevented from losing power due to the fault of one battery in a mode of connecting the plurality of batteries in parallel, as the power management system of the multi-rotor manned aircraft and the aircraft are disclosed in the prior art, the redundancy of the power supply of the electric aircraft is improved, the power management unit of the electric multi-rotor aircraft always has only one communication host to carry out data communication with the flight control system, and when the power management unit fails, the aircraft can lose state data such as battery power, temperature and current, so that the flight safety of the aircraft is greatly influenced. Disclosure of Invention In order to solve the problem of poor reliability of battery management communication of the current aircraft, the invention provides a battery management system with multiple backup communication hosts and an aircraft, which are used for improving the fault tolerance and reliability of system communication and ensuring that the aircraft reliably acquires battery data required by safe flight. In order to achieve the technical effects, the technical scheme of the invention is as follows: the battery management system with multiple backup communication hosts comprises N sets of parallel power battery assemblies, wherein N sets of power battery assemblies are connected in parallel, M battery management units are used as backup storage communication hosts, M is smaller than N, and each backup storage communication host can forward data of the N sets of power battery assemblies connected in parallel to a complete machine ALLCAN network. The battery management system with the multiple backup communication hosts provided by the technical scheme is provided with multiple independent power battery assemblies, the design of the multiple backup communication hosts is adopted, the hardware failure probability and the redundancy margin are considered, part of battery management units are selected from all battery management units to serve as backup storage communication hosts, the fault tolerance and the reliability of the aircraft in communication are improved, the aircraft is ensured to reliably acquire battery data required by safe flight, the reliability of the power management of the aircraft is improved, and the flight safety of the aircraft is ensured. Preferably, each power battery assembly comprises a battery management unit, a battery protection assembly and a power battery pack, wherein the battery protection assembly comprises a fuse FU, a Hall current sensor H and a relay K, in each power battery assembly, the negative electrode end of the power battery pack is connected to the positive electrode of an aircraft bus, the positive electrode end of the power battery pack is connected with one end of the fuse FU, the other end of the fuse FU penetrates through a middle hole of the Hall current sensor H and is connected to a first contact of the relay K, a second contact of the relay K is connected to the negative electrode of the aircraft bus, a signal acquisition line of the Hall current sensor H is connected with the battery management unit so as to realize real-time current detection, the coil terminal of the relay K is connected with the battery management unit, and the battery management unit controls the on-off of the coil terminal of the relay K according to a received CAN communication instruction so as to control whether the power battery assembly located in the power battery assembly participates in the charge-discharge state of the aircraft. The power battery assembly comprises a battery protection assembly, so that when the power battery assembly has a short circuit fault, the loop of the power battery assembly can be rapidly cut off, and the aircraft is prevented from losing power due to the short circuit fault of a certain battery. Preferably, when the loop where the power battery pack is located is faulty or abnormal, the loop current rises, and when the loop current rises