Battery power supply system and battery power equipment

Abstract

The utility model provides a battery power supply system and battery power equipment, the battery power supply system comprises a plurality of battery packs, a plurality of power supply anode ends and a common cathode end, the number of the power supply anode ends corresponds to the number of the battery packs, the anodes of the plurality of battery packs are in one-to-one connection with the plurality of power supply anode ends, and the common cathode end is in one-to-one connection with the plurality of power supply cathode ends. The cathodes of the plurality of battery packs are connected in parallel to a common cathode end; a main positive relay is connected in series between the positive pole of each battery pack and the positive pole end of the power supply; the battery power supply system further comprises a first connecting branch circuit, the negative electrodes of the multiple battery packs are connected to the common negative electrode end in parallel through the first connecting branch circuit, and a main negative relay and a current detection circuit are arranged on the first connecting branch circuit. When the main negative relay is switched on and the main positive relay of at least one battery pack is switched on, the battery pack correspondingly switched on by the main positive relay outputs a power supply to the power supply positive terminal and the common negative terminal; and the current detection circuit is used for detecting the current of the first connection branch.

Description

Technical Field

[0001] The utility model relates to the technical field of aircraft, in particular to a battery power supply system and a battery power device. Background Art

[0002] In the field of eVTOL (electric Vertical Take-off and Landing), power batteries are the only power source for aircraft, and their importance is self-evident. A very critical point to improve the safety redundancy of flying cars is to perform power backup, and a high-voltage architecture with safety redundancy is particularly important. Among them, a high-voltage architecture with safety redundancy is used to power flying cars through multiple battery packs in parallel. When the power demand is large, multiple battery packs can be powered at the same time, or when a battery pack fails, the remaining battery packs can still provide power output to ensure the normal operation of the flying car. In this way, multiple battery packs require individually designed relays and current sensors, which are costly and increase the weight of the flying car. Utility Model Content

[0003] The main purpose of the utility model is to provide a battery power supply system and a battery power device, aiming at reducing the cost and weight of an aircraft.

[0004] The utility model proposes a battery power supply system, which includes multiple battery packs, a positive power supply terminal and a common negative terminal. The number of the positive power supply terminals is multiple and corresponds to the number of the battery packs. The positive poles of the multiple battery packs are connected one-to-one with the multiple positive power supply terminals, and the negative poles of the multiple battery packs are connected in parallel to the common negative terminal; a main positive relay is connected in series between the positive pole of each battery pack and the positive power supply terminal; the battery power supply system also includes a first connecting branch, and the negative poles of the multiple battery packs are respectively connected in parallel to the common negative terminal via the first connecting branch, and a main negative relay and a current detection circuit are arranged on the first connecting branch; when the main negative relay is turned on and the main positive relay of at least one of the battery packs is turned on, the main positive relay outputs power to the positive power supply terminal and the common negative terminal corresponding to the turned-on battery pack; the current detection circuit is used to detect the current of the first connecting branch.

[0005] In one embodiment, there are multiple current sensors, and the multiple current sensors are connected in series on the first connecting branch.

[0006] In one embodiment, the main negative relay and the current detection circuit are disposed in one of the battery packs.

[0007] In one embodiment, each of the battery packs has a controller, and the controller of each of the battery packs is respectively connected to the corresponding main positive relay, and the main negative relay and the current detection circuit are connected to one of the controllers. The controller of each of the battery packs is used to control the corresponding main positive relay and the main negative relay of the corresponding battery pack to be turned on and off, so as to control the corresponding one or more battery packs to output power to the positive power terminal and the common negative terminal.

[0008] In one embodiment, each of the battery packs has a controller. When there are multiple current detection circuits, the controller of each battery pack is connected to at least one current detection circuit. The controller of each battery pack is used to perform control according to a detection signal of at least one current detection circuit.

[0009] In one embodiment, each of the battery packs has a pre-charging relay, and a first end of the pre-charging relay of each of the battery packs is connected to a connection end between the positive pole of the corresponding battery pack and the main positive relay, and a second end of the pre-charging relay of each of the battery packs is connected to a connection end between the main positive relay of the corresponding battery pack and the positive end of the power supply.

[0010] In one embodiment, each of the battery packs has a pre-charging resistor, a first end of the pre-charging resistor of each of the battery packs is connected to a pre-charging relay corresponding to the battery pack, and a second end of the pre-charging resistor of each of the battery packs is connected to a connection end between a main positive relay corresponding to the battery pack and the positive end of the power supply.

[0011] In one embodiment, a fuse is connected in series between the positive electrode of each battery pack and the main positive relay.

[0012] The utility model also provides a battery power device, which includes the battery power supply system as described above.

[0013] In one embodiment, the battery-powered device is a flying car.

[0014] The utility model proposes a battery power supply system and a battery power device. The battery power supply system includes multiple battery packs, a positive power supply terminal and a common negative terminal. The number of the positive power supply terminals is multiple and corresponds to the number of battery packs. The positive poles of the multiple battery packs are connected one-to-one with the multiple positive power supply terminals, and the negative poles of the multiple battery packs are connected in parallel to the common negative terminal. A main positive relay is connected in series between the positive pole of each battery pack and the positive power supply terminal. The battery power supply system also includes a first connecting branch. The negative poles of the multiple battery packs are respectively connected in parallel to the common negative terminal via the first connecting branch. A main negative relay and a current detection circuit are arranged on the first connecting branch. When the main negative relay is turned on and the main positive relay of at least one battery pack is turned on, the main positive relay outputs power to the positive power supply terminal and the common negative terminal corresponding to the turned-on battery pack. The current detection circuit is used to detect the current of the first connecting branch. BRIEF DESCRIPTION OF THE DRAWINGS

[0015] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying creative work.

[0016] Figure 1 This is a circuit diagram of the battery power supply system of the utility model;

[0017] Figure 2 This is a circuit diagram of another embodiment of the battery power supply system of the utility model;

[0018] Figure 3 This is a circuit diagram of another embodiment of the battery power supply system of the utility model.

[0019] The realization of the purpose, functional features and advantages of the utility model will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0020] The following will be combined with the drawings in the embodiments of the utility model to clearly and completely describe the technical solutions in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0021] It should be noted that if the embodiments of the present invention involve directional indications (such as up, down, left, right, front, back...), the directional indications are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0022] In addition, if there are descriptions involving "first", "second", etc. in the embodiments of the utility model, the descriptions of "first", "second", etc. are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, if the meaning of "and / or" appearing in the full text is to include three parallel schemes, taking "A and / or B" as an example, it includes scheme A, or scheme B, or a scheme that satisfies both A and B. In addition, the technical solutions between the various embodiments can be combined with each other, but it must be based on the ability of ordinary technicians in this field to implement. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the utility model.

[0023] In the field of eVTOL (electric Vertical Take-off and Landing), power batteries are the only power source for aircraft, and their importance is self-evident. A key point to improve the safety redundancy of flying cars is to perform power backup, and a high-voltage architecture with safety redundancy is particularly important. Among them, a high-voltage architecture with safety redundancy is used to power flying cars through multiple battery packs in parallel. When the power demand is large, multiple battery packs can be powered at the same time, or when a battery pack fails, the remaining battery packs can still provide power output to ensure the normal operation of the flying car. When this method is used to power a flying car, each battery pack needs to be individually designed with a relay to conduct the path between the battery pack and the load; and each battery pack needs to be individually designed with a current sensor to detect the current of the battery pack. Due to the excessive number of relays and current sensors, not only the cost of the flying car is increased, but also the weight of the flying car is increased.

[0024] The utility model provides a battery power supply system, referring to Figure 1 The battery power supply system includes a plurality of battery packs, a positive power supply terminal and a common negative power supply terminal. The number of the positive power supply terminals is multiple and corresponds to the number of the battery packs. The positive electrodes of the plurality of battery packs are connected one-to-one with the plurality of positive power supply terminals, and the negative electrodes of the plurality of battery packs are connected in parallel to the common negative power supply terminal. A main positive relay is connected in series between the positive electrode of each battery pack and the positive power supply terminal.

[0025] The battery power supply system further includes a first connecting branch, wherein the negative electrodes of the plurality of battery packs are respectively connected to the common negative terminal through the first connecting branch, and a main negative relay and a current detection circuit are arranged on the first connecting branch;

[0026] When the main negative relay is turned on and the main positive relay of at least one of the battery packs is turned on, the main positive relay outputs power to the positive power terminal and the common negative terminal of the battery pack corresponding to the turned-on battery pack;

[0027] The current detection circuit is used to detect the current of the first connecting branch.

[0028] It is understandable that in order to improve the safety redundancy of flying cars, multiple battery packs are currently connected in parallel to provide power to flying cars. When the power demand is large, multiple battery packs can supply power at the same time; or when a battery pack fails, the remaining battery packs can still provide power output to ensure the normal operation of the flying car. However, when multiple battery packs are connected in parallel to provide power to the flying car, each battery pack requires a single designed relay and current sensor, which increases the cost and weight of the flying car. In order to reduce the cost and weight of the flying car, the utility model proposes a battery power supply system, which removes the main negative relay and current sensor from multiple battery packs, and sets the main negative relay and current sensor on the first connecting branch, so that the first connecting branch where the main negative relay and current sensor are located is used as a common circuit for multiple battery packs, while realizing the simultaneous power supply of multiple battery packs, the cost and weight of the flying car are reduced.

[0029] In this embodiment, the battery power supply system includes multiple battery packs, a positive power supply terminal and a common negative terminal. The positive power supply terminal and the common negative terminal are used to connect a load or a charging pile. When the positive power supply terminal and the common negative terminal are connected to a load, multiple battery packs output power to the positive power supply terminal and the common negative terminal, and the positive power supply terminal and the common negative terminal transmit the power to the load, thereby providing power for the flying car; when the positive power supply terminal and the common negative terminal are connected to the charging pile, the charging pile outputs the charging power to the positive power supply terminal and the common negative terminal, and the positive power supply terminal and the common negative terminal transmit the charging power to the positive and negative electrodes of the multiple battery packs respectively, so as to charge the multiple battery packs. The number of positive power supply terminals in this embodiment is multiple, and the positive power supply terminal corresponds to the number of battery packs. The positive electrodes of the multiple battery packs are connected one-to-one with the multiple positive power supply terminals, and the negative electrodes of the multiple battery packs are connected in parallel to the common negative terminal. For example, when the number of positive power supply terminals is 3, the number of battery packs is 3, the positive electrodes of the three battery packs are connected one-to-one with the three positive power supply terminals, and the negative electrodes of the three battery packs are connected in parallel to the common negative terminal. In addition, a main positive relay is connected in series between the positive electrode of each battery pack and the positive terminal of the power supply. The main positive relay is used to turn on / off the path between the positive electrode of each battery pack and the positive terminal of the power supply. In actual applications, the default working mode of multiple parallel battery packs is that all battery packs work at the same time. During use, if a battery pack fails and can no longer provide power output, the main positive relay in the faulty battery pack is turned off, and the remaining non-faulty battery packs work normally.

[0030] It should be understood that in this embodiment, the main negative relays and current detection circuits of multiple battery packs are removed, and the main negative relays and current detection circuits are arranged on the first connection branch. The negative electrodes of multiple battery packs are respectively connected to the common negative terminal through the main negative relays and current detection circuits on the first connection branch. The first connection branch can be arranged inside the battery pack or outside the battery pack. When the first connection branch is arranged inside the battery pack, the integrated arrangement of the battery pack can be realized, reducing the occupied area of ​​the flying car; when the first connection branch is arranged outside the battery pack, it is convenient for technicians to maintain the main negative relays and current detection circuits on the first connection branch. In practical applications, when the main negative relay on the first connection branch is turned on, and the main positive relay of at least one battery pack is turned on, the main positive relay outputs power to the positive power terminal and the common negative terminal of the battery pack corresponding to the turned-on power supply, and the positive power terminal and the common negative terminal transmit the power output by the battery pack to the load, and the load can be the power module of the flying car. In addition, the current detection circuit is implemented by a current sensor, and the current sensor is used to detect the current of the first connection branch, specifically used to detect the current of the battery pack corresponding to the turned-on main positive relay. For example, when the number of battery packs is 4, the main negative relay on the first connecting branch is turned on, and the main positive relays of 3 battery packs are turned on, the main positive relays corresponding to the 3 turned-on battery packs output power to the positive power terminal and the common negative terminal; at the same time, the current detection circuit detects the current of the 3 battery packs corresponding to the main positive relays.

[0031] The utility model proposes a battery power supply system, which includes multiple battery packs, a positive power supply terminal and a common negative terminal. The number of the positive power supply terminals is multiple and corresponds to the number of battery packs. The positive poles of the multiple battery packs are connected one-to-one with the multiple positive power supply terminals, and the negative poles of the multiple battery packs are connected in parallel to the common negative terminal. A main positive relay is connected in series between the positive pole of each battery pack and the positive power supply terminal. The battery power supply system also includes a first connecting branch, and the negative poles of the multiple battery packs are respectively connected in parallel to the common negative terminal via the first connecting branch. A main negative relay and a current detection circuit are arranged on the first connecting branch. When the main negative relay is turned on and the main positive relay of at least one battery pack is turned on, the main positive relay outputs power to the positive power supply terminal and the common negative terminal corresponding to the turned-on battery pack. The current detection circuit is used to detect the current of the first connecting branch.

[0032] In one embodiment, there are multiple current sensors, and the multiple current sensors are connected in series on the first connecting branch.

[0033] It can be understood that the current detection circuit in this embodiment is implemented by a current sensor. To ensure that the current sensor can work stably, multiple current sensors are designed on the first connection branch for safety redundancy. When one or more current sensors fail, at least one remaining current sensor that is not failed can still detect the current of the first connection branch. In this embodiment, multiple current sensors are provided, and at least one current sensor can be used as a backup sensor for detecting the first connection path, thereby ensuring the stable operation of the current sensor.

[0034] In one embodiment, referring to Figure 2 , the main negative relay and the current detection circuit are arranged in one of the battery packs.

[0035] It is understandable that the main negative relay and the current detection circuit can be arranged inside the battery pack or outside the battery pack. In this embodiment, the main negative relay and the current detection circuit are arranged inside the battery pack, which can realize the integrated arrangement of the battery pack and reduce the occupied area of ​​the flying car; in another embodiment, the main negative relay and the current detection circuit are arranged outside the battery pack, which is convenient for technicians to repair the main negative relay and the current detection circuit, and to increase or decrease the number of the main negative relay and the current detection circuit.

[0036] In one embodiment, referring to Figure 3 Each of the battery packs has a controller, and the controller of each of the battery packs is respectively connected to the corresponding main positive relay, and the main negative relay and the current detection circuit are connected to one of the controllers. The controller of each of the battery packs is used to control the corresponding main positive relay and the main negative relay of the corresponding battery pack to be turned on and off, so as to control the corresponding one or more battery packs to output power to the positive power terminal and the common negative terminal.

[0037] It can be understood that in this embodiment, when the positive terminal of the power supply and the common negative terminal are connected to the load of the flying car, the controller of each battery pack is used to control the main positive relay to turn on / off, so as to turn on / off the path between the positive electrode of each battery pack and the positive terminal of the power supply; the controller of each battery pack is also used to send the working mode to the high-voltage activation state after the pre-charging is successful; the controller connected to the main negative relay and the current detection circuit is used to control the main negative relay to turn on / off, so as to turn on / off the path between the negative electrodes of multiple battery packs and the common negative terminal; the controller connected to the main negative relay and the current detection circuit is also used to obtain the current value of the current detection circuit, and calculate the current value of the battery pack corresponding to the main positive relay according to the current value of the current detection circuit and the number of battery packs in the high-voltage activation state.

[0038] When the positive terminal of the power supply and the common negative terminal are connected to the charging pile, the controller of each battery pack is used to determine its own status. When a charging-not-allowed fault occurs, it sends a signal that charging is not allowed and requests to disconnect the high voltage. The controller of each battery pack is also used to send a demand current of 0 when the full condition is reached and request to disconnect the high voltage. The controller connected to the main negative relay and the current detection circuit serves as the master controller for calculating the charging demand current and the charging demand voltage, and is used to send the charging demand current and the charging demand voltage to the charging pile.

[0039] In one embodiment, referring to Figure 3 Each of the battery packs has a controller. When there are multiple current detection circuits, the controller of each battery pack is connected to at least one of the current detection circuits. The controller of each battery pack is used to control according to the detection signal of at least one of the current detection circuits.

[0040] It can be understood that in this embodiment, the controller of each battery pack is connected to the current detection circuit, and when the current detection circuit or controller of a battery pack fails, the current detection circuits and controllers of the remaining battery packs can still work normally. For example, the multiple battery packs include battery pack 1, battery pack 2 and battery pack 3. When the current detection circuit or controller in battery pack 1 fails, the current detection circuits and controllers in battery packs 2 and 3 can work normally.

[0041] In addition, the controller in the same battery pack can be connected to multiple current detection circuits at the same time, and the controller is used to obtain the current value of at least one current detection circuit for control. Specifically, the current detection circuit is implemented by a current sensor, and multiple current sensors are designed on the first connection branch, and each battery pack has a controller, and the multiple current sensors are respectively connected to one of the multiple controllers. Among them, the controller connected to the multiple current sensors is used as the main controller of the battery power supply system, which is used to control according to the detection signal of at least one current detection circuit. For example, when two current sensors are set in the first connection branch and the two current sensors work normally, the controller compares the current values ​​detected by the two current sensors in real time. When the absolute value corresponding to the difference between the current values ​​of the two current sensors is greater than the preset value, the larger current value of the two is used for fault diagnosis and SOC calculation. Preferably, the preset value in this embodiment is set to 5A; when the two current sensors are set in the first connection branch and one of the current sensors fails, the controller obtains the current value of the other current sensor.

[0042] In one embodiment, referring to Figure 3, each of the battery packs has a pre-charge relay, a first end of the pre-charge relay of each of the battery packs is connected to a connection end between the positive electrode of the corresponding battery pack and the main positive relay, and a second end of the pre-charge relay of each of the battery packs is connected to a connection end between the main positive relay of the corresponding battery pack and the positive terminal of the power supply;

[0043] Each of the battery packs has a pre-charging resistor, a first end of the pre-charging resistor of each of the battery packs is connected to the pre-charging relay corresponding to the battery pack, and a second end of the pre-charging resistor of each of the battery packs is connected to the connection end between the main positive relay of the corresponding battery pack and the positive end of the power supply.

[0044] It can be understood that each battery pack is provided with a pre-charge relay and a preset resistor, the first end of the pre-charge relay is connected to the first end of the main positive relay, the second end of the pre-charge relay is connected to the first end of the pre-charge resistor, and the second end of the pre-charge resistor is connected to the second end of the main positive relay.

[0045] In this embodiment, when the positive terminal of the power supply and the common negative terminal are connected to the load of the flying car to supply power to the load, the controller connected to the main negative relay and the current detection circuit controls the main negative relay to conduct to conduct the path between the negative electrodes of multiple battery packs and the common negative terminal. At the same time, the controller of each battery pack controls the pre-charge relay to conduct to conduct the path between the positive electrode of each battery pack and the pre-charge resistor, so as to pre-charge each battery pack. When the control package of each battery pack detects that the front-end voltage and the rear-end voltage of the main positive relay of the battery pack meet the pre-charge condition, it is confirmed that the pre-charge of the battery pack is successful. The controller of the battery pack that has been successfully pre-charged sends the working mode as the high-voltage activation state, and the controller connected to the main negative relay and the current detection circuit receives the high-voltage activation state sent by other battery packs to calculate the number of battery packs in the high-voltage activation state. The controller connected to the main negative relay and the current detection circuit calculates the current value of each battery pack in the high-voltage activation state according to the number of battery packs in the high-voltage activation state and the current value of the current detection circuit. The controller of each battery pack performs ampere-hour integration to estimate the SOC and fault diagnosis for the battery pack according to the calculated current value.

[0046] In one embodiment, referring to Figure 3 , the number of battery packs is set to n, the number of controllers is corresponding to n, represented by BMS1, BMS2...BMSn respectively; the number of main positive relays is corresponding to n, represented by K11, K12...K1n respectively; the number of pre-charge relays is corresponding to n, represented by K21, K22...K2n respectively; the number of pre-charge resistors is corresponding to n, represented by R1, R2...Rn respectively; the main negative relay is K3. Therefore, the specific working process of the battery power supply system is:

[0047] When the positive terminal and the common negative terminal of the power supply are connected to the load of the flying car to power the load, low-voltage power-on is performed first to wake up the controller (BMS1, BMS2...BMSn) of each battery pack. After the controller (BMS1, BMS2...BMSn) of each battery pack receives the high-voltage power-on instruction, the controller BMS1 connected to the main negative relay and the current detection circuit closes the main negative relay K3. At the same time, the controllers of the remaining battery packs (BMS2, BMS2...BMSn) close the pre-charge relays K21, K22...K2n of the battery packs. The controller of each battery pack performs pre-charge judgment separately. It should be understood that the front-end voltage of the main positive relay (K11, K12...K1n) is defined as UAC (the front-end voltage refers to the voltage on the positive side of the main positive relay close to the battery pack) and UBC (the rear-end voltage refers to the voltage on the side of the main positive relay close to the load). When the UAC and UBC values ​​satisfy a certain relationship (UBC≥m*UAC, m is a coefficient, preferably, m is set to 95%), the controller determines that the pre-charge of the battery pack is successful. For the remaining battery packs, when the UA2C2 and UB2C2 values ​​or the UAnCn and UBnCn values ​​satisfy a certain relationship (UB2C2≥m*UA2C2 or UBnCn≥m*UAnCn, m is a coefficient, preferably, m is set to 95%), the controller determines that the pre-charge of the battery pack is successful. After the battery pack is pre-charged successfully, the working mode is sent as high-voltage activation state. The controller of each battery pack (BMS1, BMS2...BMSn) sends the number of working modes in high-voltage activation state n separately. The controller BMS1 connected to the main negative relay and the current detection circuit calculates according to the current value I of the current sensor and the number of battery packs in high-voltage activation state n to calculate the current of each battery pack loop. That is, the current of each battery pack loop = current sensor current value I / (the number of working modes in high-voltage activation state n), and the controller of each battery pack (BMS1, BMS2...BMSn) estimates the SOC by ampere-hour integration according to the current of each battery pack loop calculated by BMS1. It should be understood that when a battery pack fails during operation and is not allowed to continue working, the controller of the faulty battery pack disconnects the main positive relay (K11 or K12...or K1n) of the battery pack where it is located. At the same time, the controller of the faulty battery pack sends the working mode as a fault state, and the remaining battery packs work normally. After the controller (BMS1, BMS2...BMSn) of each battery pack receives the high-voltage power-off signal, the controller BMS1 connected to the main negative relay and the current detection circuit first determines that the main circuit current value is less than the preset value (such as 5A) and then disconnects the main negative relay K3. At the same time, the controller (BMS1, BMS2...BMSn) of each battery pack disconnects the main positive relay (K11 or K12...K1n), and finally completes the high-voltage power-off.

[0048] When the positive terminal of the power supply and the common negative terminal are connected to the charging pile for AC charging or DC charging, the controller BMS1 connected to the main negative relay and the current detection circuit is used as the main control module to calculate the charging demand current and charging demand voltage. The charging demand voltage is the highest value of the battery in the working mode of high voltage activation state +5V, and the demand current is the sum of the demand currents in the working mode of high voltage activation state. The controllers BMS1, BMS2...BMSn) of each battery pack judge their own status in real time. When a charging failure occurs, it sends a signal that charging is not allowed and requests to disconnect the high voltage. The controller BMS1 connected to the main negative relay and the current detection circuit sends the demand voltage according to the total voltage of the faulty battery pack, and the demand current sends 0. After the high voltage power-off of the faulty battery pack is completed, the charging demand voltage is the highest value of the battery in the working mode of high voltage activation state +5V, and the demand current is the sum of the demand currents in the working mode of high voltage activation state. The controller (BMS1, BMS2...BMSn) of each battery pack determines the charging status in real time. When a battery pack reaches the full condition, the controller (BMS1, BMS2...BMSn) of the battery pack that reaches the full condition sends the required current to 0 and then sends a request to disconnect the high voltage. The controller BMS1 connected to the main negative relay and the current detection circuit sends the required voltage according to the total voltage of the fully charged battery pack. The required current is the sum of the required currents when the working mode is the high voltage activation state and the charging state is charging. Until all battery packs are fully charged, the required current and required voltage are sent to 0. After receiving the high-voltage power-off signal, the controller BMS1 connected to the main negative relay and the current detection circuit first determines that the main circuit current value is less than the preset value (such as 5A) and disconnects the relay K3. At the same time, the controller (BMS1, BMS2...BMSn) of each battery pack disconnects the main positive relay (K11 or K12...K1n), and finally completes the high-voltage power-off.

[0049] In one embodiment, referring to Figure 3 A fuse is connected in series between the positive electrode of each battery pack and the main positive relay.

[0050] It can be understood that in this embodiment, the fuse is used to protect each battery pack in the battery-powered system. When the current value output by the battery pack exceeds the specified value, the heat generated by the battery pack itself causes the fuse to melt, thereby disconnecting the path between the positive electrode of the battery pack and the main positive relay, so as to stop the battery pack from supplying power to the load or stop the battery pack from charging.

[0051] The utility model also provides a battery power device, which includes the battery power supply system as described above.

[0052] It is understandable that the battery power device includes a battery power supply system, and the battery power device can be a battery power device such as an electric car, a flying car or an electric bicycle, and is used to reduce the design cost and volume weight of other battery power devices such as electric cars, flying cars or electric bicycles. In addition, the specific circuit structure of the battery power device refers to the above embodiment. Since the battery power device adopts all the technical solutions of all the above embodiments, it at least has all the beneficial effects brought by the technical solutions of the above embodiments, which will not be repeated here one by one.

[0053] The utility model also provides a battery power device, and the battery power device is a flying car.

[0054] It is understandable that the redundant safety high-voltage architecture of existing flying cars is composed of multiple battery packs, which are connected in parallel to provide power to the flying car. However, each battery pack needs to be equipped with a relay and a current sensor separately, which leads to high cost and increases the weight of the flying car. Therefore, in this embodiment, the battery power device is a flying car, and the battery power supply system in the battery power device removes the main negative relay and the current sensor in the multiple battery packs, and sets the main negative relay and the current sensor on the first connecting branch, so that the first connecting branch where the main negative relay and the current sensor are located is used as a common circuit for multiple battery packs, which reduces the cost and weight of the flying car while realizing the simultaneous power supply of multiple battery packs.

[0055] The above embodiments are only preferred embodiments of the present invention, and do not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. A battery powered system, characterized in that: The battery power supply system includes a plurality of battery packs, a positive power supply terminal and a common negative power supply terminal. The number of the positive power supply terminals is multiple and corresponds to the number of the battery packs. The positive poles of the plurality of battery packs are connected one-to-one with the plurality of positive power supply terminals, and the negative poles of the plurality of battery packs are connected in parallel to the common negative power supply terminal. A main positive relay is connected in series between the positive pole of each battery pack and the positive power supply terminal. The battery power supply system further includes a first connecting branch, wherein the negative electrodes of the plurality of battery packs are respectively connected to the common negative terminal through the first connecting branch, and a main negative relay and a current detection circuit are arranged on the first connecting branch; When the main negative relay is turned on and the main positive relay of at least one of the battery packs is turned on, the main positive relay outputs power to the positive power terminal and the common negative terminal of the battery pack corresponding to the turned-on battery pack; The current detection circuit is used to detect the current of the first connecting branch.

2. The battery powered system according to claim 1, wherein: The current detection circuit includes a current sensor. There are multiple current sensors, and the multiple current sensors are connected in series on the first connection branch.

3. The battery powered system according to claim 1, wherein: The main negative relay and the current detection circuit are arranged in one of the battery packs.

4. The battery powered system according to claim 1, wherein: Each of the battery packs has a controller, and the controller of each of the battery packs is respectively connected to the corresponding main positive relay, and the main negative relay and the current detection circuit are connected to one of the controllers. The controller of each of the battery packs is used to control the corresponding main positive relay and the main negative relay of the corresponding battery pack to be turned on and off, so as to control the corresponding one or more battery packs to output power to the positive power terminal and the common negative terminal.

5. The battery powered system according to claim 1, wherein: Each of the battery packs has a controller. When there are multiple current detection circuits, the controller of each battery pack is connected to at least one of the current detection circuits. The controller of each battery pack is used to perform control according to a detection signal of at least one of the current detection circuits.

6. The battery powered system according to claim 1, wherein: Each of the battery packs has a pre-charging relay, and the first end of the pre-charging relay of each of the battery packs is connected to the connection end between the positive pole of the corresponding battery pack and the main positive relay, and the second end of the pre-charging relay of each of the battery packs is connected to the connection end between the main positive relay of the corresponding battery pack and the positive end of the power supply.

7. The battery powered system according to claim 6, wherein: Each of the battery packs has a pre-charging resistor, a first end of the pre-charging resistor of each of the battery packs is connected to the pre-charging relay corresponding to the battery pack, and a second end of the pre-charging resistor of each of the battery packs is connected to the connection end between the main positive relay of the corresponding battery pack and the positive end of the power supply.

8. The battery powered system according to claim 1, wherein: A fuse is connected in series between the positive electrode of each battery pack and the main positive relay.

9. A battery powered device, characterized in that: The battery powered device comprises a battery powered system as claimed in any one of claims 1 to 8.

10. The battery powered device according to claim 9, characterized in that: The battery powered device is a flying car.

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