Multi-pack parallel eVTOL battery pack current acquisition system

Abstract

The utility model discloses a multi-pack parallel eVTOL battery pack current acquisition system, which belongs to the technical field of battery pack current acquisition and comprises a battery pack module and a PDU module, the battery pack module is connected with the PDU module, the PDU module is connected with a DC-to-AC module, and the DC-to-AC module is connected with a load. Through the mode, the current sensor A1 is arranged in each battery pack of the plurality of battery packs connected in parallel, and the current sensor A0 is arranged in the PDU module, so that the current values of the plurality of battery packs can still be obtained even if the current sensor A1 in a certain battery pack fails.

Description

Technical Field

[0001] The utility model relates to the technical field of battery pack current collection, and in particular to a multi-pack parallel eVTOL battery pack current collection system. Background Art

[0002] The electric vehicle battery management system (BMS) is the crucial link between the onboard power battery and the electric vehicle. The BMS collects, processes, and stores critical information about the battery pack's operation in real time, exchanging information with external devices such as the vehicle controller. It addresses key issues in lithium-ion battery systems, including safety, availability, usability, and service life. Its primary functions are to improve battery utilization, prevent overcharging and overdischarging, extend battery life, and monitor battery status.

[0003] For example, Chinese patent CN218966726U discloses a battery management system and electric vehicle. The system is equipped with a cell sampling interface, a current sampling module, a switch module, a control module, a first trigger module, and a signal holding module. The cell sampling interface receives the state parameters of the cell, the current sampling module collects the loop current, and the switch module is set in the charge and discharge circuit to control the loop on and off. The control module is connected to the cell sampling interface and the current sampling module respectively, and can generate a control signal based on the state parameters and the loop current, and can also provide a clock signal.

[0004] However, the technology has the following problems: it is only applicable to current sampling of a single battery pack. For current collection of multiple parallel eVTOL battery packs, current is usually collected by placing a current sensor in each battery pack of multiple parallel battery packs. Once the current sensor of a single pack fails, the current value of the single pack cannot be obtained.

[0005] Based on this, the present invention designs a multi-pack parallel eVTOL battery pack current acquisition system to solve the above problems. Utility Model Content

[0006] In view of the above-mentioned shortcomings of the prior art, the present invention provides a current acquisition system for multi-pack parallel eVTOL battery packs.

[0007] In order to achieve the above objectives, the present invention is implemented through the following technical solutions:

[0008] A multi-pack parallel eVTOL battery pack current acquisition system includes a battery pack module and a PDU module, wherein the battery pack module is connected to the PDU module, the PDU module is connected to a DC-to-AC module, and the DC-to-AC module is connected to a load;

[0009] The battery pack module includes a first battery pack, a second battery pack and a third battery pack, and the positive poles of the first battery pack, the second battery pack and the third battery pack are all connected to the PDU module; the negative poles of the first battery pack, the second battery pack and the third battery pack are connected in parallel and connected to the PDU module.

[0010] The PDU module is equipped with a current sensor A0. The negative poles of the first battery pack, the second battery pack, and the third battery pack are connected in parallel to the PDU module. The current sensor A0 is connected to the DC to AC module.

[0011] Furthermore, the first battery pack includes a fuse F1, four battery cells, a main positive relay K2, a pre-charging circuit, a current sensor A1 and a main negative relay K1; one end of the main positive relay K2 is electrically connected to one end of the fuse F1, the other end of the main positive relay K2 is electrically connected to the PDU module, the other end of the fuse F1 is electrically connected to the positive pole of the first battery cell, the four battery cells are connected in series in sequence, the negative pole of the fourth battery cell is electrically connected to one end of the current sensor A1, the other end of the current sensor A1 is electrically connected to one end of the main negative relay K1, the other end of the main negative relay K1 is electrically connected to the current sensor A0, and the pre-charging circuit is connected in parallel to both ends of the main positive relay K2.

[0012] Furthermore, the pre-charging circuit includes a pre-charging resistor R1 and a pre-charging relay K3; one end of the pre-charging resistor R1 is electrically connected to one end of the fuse F1 and one end of the main positive relay K2, the other end of the pre-charging resistor R1 is electrically connected to one end of the pre-charging relay K3, and the other end of the pre-charging relay K3 is electrically connected to the other end of the main positive relay K2.

[0013] Furthermore, the internal structures of the first battery pack, the second battery pack, and the third battery pack are all the same.

[0014] Furthermore, the other end of the first battery pack main negative relay K1 is connected in parallel with the other end of the second battery pack main negative relay K1 and the other end of the third battery pack main negative relay K1 and is electrically connected to the current sensor A0.

[0015] Furthermore, the other end of the main positive relay K2 of the first battery pack, the other end of the main positive relay K2 of the second battery pack, and the other end of the main positive relay K2 of the third battery pack are all electrically connected to the PDU module.

[0016] Furthermore, the DC to AC module includes four groups of DC / AC converters, the first ends of the four groups of DC / AC converters are electrically connected to one end of fuse F2, fuse F3, fuse F4, and fuse F5 in sequence, the other ends of fuse F2, fuse F3, fuse F4, and fuse F5 are all electrically connected to the PDU module, and the second ends of the four groups of DC / AC converters are electrically connected to the other end of the current sensor A0 after being connected in parallel.

[0017] Furthermore, the load includes a motor M1 , a motor M2 , a motor M3 and a motor M4 , and the third terminals of the four DC / AC converters are electrically connected to the motor M1 , the motor M2 , the motor M3 and the motor M4 , respectively.

[0018] Compared with the prior art, the present invention has the following beneficial effects: the present invention is composed of a first battery pack, a second battery pack, a third battery pack and a PDU module. When the entire system is working normally, the current sensors A1 built into the three battery packs and the current sensor A0 built into the PDU module will collect the current of the separate battery packs and the total system current; assuming that the current sensor A1 of the first battery pack fails, the current value of the failed first battery pack can be obtained by subtracting the current collection value of the current sensor A0 in the PDU module from the sum of the current sensors A1 in the second and third battery packs; the present invention places a current sensor A1 in each battery pack of multiple parallel battery packs and places a current sensor A0 in the PDU module, so that even if the current sensor A1 in a battery pack fails, the current values ​​of multiple battery packs can still be obtained. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the following briefly introduces the drawings required for the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be derived from these drawings without inventive effort.

[0020] Figure 1 This is a connection frame for a multi-pack parallel eVTOL battery pack current acquisition system of the utility model. Figure 1 ;

[0021] Figure 2 This is a connection frame for a multi-pack parallel eVTOL battery pack current acquisition system of the utility model. Figure 2 ;

[0022] Figure 3 This is a schematic diagram of the circuit connection of the first battery pack of the present invention.

[0023] The numbers in the figure represent:

[0024] 1. Battery pack module; 11. First battery pack; 12. Second battery pack; 13. Third battery pack; 2. PDU module; 3. DC to AC module; 4. Load. DETAILED DESCRIPTION

[0025] To make the purpose, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings of the embodiments of the present invention. Obviously, the described embodiments are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0026] Example 1: In some embodiments, please refer to the accompanying drawings of the specification. Figure 1-Figure 3 , including a battery pack module 1 and a PDU (Power Distribution Unit) module 2, the battery pack module 1 is connected to the PDU module 2, the PDU module 2 is connected to the DC-AC module 3, and the DC-AC module 3 is connected to the load 4;

[0027] like Figure 2 As shown, the battery pack module 1 includes a first battery pack 11, a second battery pack 12 and a third battery pack 13, and the positive poles of the first battery pack 11, the second battery pack 12 and the third battery pack are all connected to the PDU module 2; the negative poles of the first battery pack 11, the second battery pack 12 and the third battery pack are connected in parallel to the PDU module 2.

[0028] A current sensor A0 is installed on the PDU module 2. The negative poles of the first battery pack 11, the second battery pack 12, and the third battery pack are connected in parallel to the PDU module 2. The current sensor A0 is connected to the DC to AC module 3.

[0029] This utility consists of a first battery pack 11, a second battery pack 12, a third battery pack 13, and a PDU module 2. When the entire system is operating normally, the current sensors A1 built into each of the three battery packs and the current sensor A0 built into the PDU module collect the current of each individual battery pack and the total system current. If the current sensor A1 of the first battery pack fails, the current value of the failed first battery pack can be obtained by subtracting the sum of the current sensors A1 in the second and third battery packs from the current value collected by the current sensor A0 in the PDU module.

[0030] like Figure 3As shown, the first battery pack 11 includes a fuse F1, four battery cells, a main positive relay K2, a pre-charging circuit, a current sensor A1 and a main negative relay K1; one end of the main positive relay K2 is electrically connected to one end of the fuse F1, the other end of the main positive relay K2 is electrically connected to the PDU module 2, the other end of the fuse F1 is electrically connected to the positive pole of the first battery cell, the four battery cells are connected in series in sequence, the negative pole of the fourth battery cell is electrically connected to one end of the current sensor A1, the other end of the current sensor A1 is electrically connected to one end of the main negative relay K1, the other end of the main negative relay K1 is electrically connected to the current sensor A0, and the pre-charging circuit is connected in parallel to both ends of the main positive relay K2.

[0031] The pre-charging circuit includes a pre-charging resistor R1 and a pre-charging relay K3; one end of the pre-charging resistor R1 is electrically connected to one end of the fuse F1 and one end of the main positive relay K2, the other end of the pre-charging resistor R1 is electrically connected to one end of the pre-charging relay K3, and the other end of the pre-charging relay K3 is electrically connected to the other end of the main positive relay K2.

[0032] The first battery pack 11 , the second battery pack 12 , and the third battery pack 13 all have the same internal structure.

[0033] The other end of the main negative relay K1 of the first battery pack 11 is connected in parallel with the other end of the main negative relay K1 of the second battery pack 12 and the other end of the main negative relay K1 of the third battery pack 13 and then electrically connected to the current sensor A0.

[0034] The other end of the main positive relay K2 of the first battery pack 11 , the other end of the main positive relay K2 of the second battery pack 12 , and the other end of the main positive relay K2 of the third battery pack 13 are all electrically connected to the PDU module 2 .

[0035] The DC to AC module 3 includes four groups of DC / AC converters (Direct Current / Alternating Current converts direct current into alternating current). The first ends of the four groups of DC / AC converters are electrically connected to one end of fuse F2, fuse F3, fuse F4, and fuse F5 in sequence. The other ends of fuse F2, fuse F3, fuse F4, and fuse F5 are all electrically connected to the PDU module 2. The second ends of the four groups of DC / AC converters are connected in parallel and electrically connected to the other end of the current sensor A0.

[0036] The load 4 includes a motor M1 , a motor M2 , a motor M3 and a motor M4 , and the third terminals of the four DC / AC converters are electrically connected to the motor M1 , the motor M2 , the motor M3 and the motor M4 , respectively.

[0037] The present invention discloses a current acquisition system for multiple parallel eVTOL battery packs. The system places a current sensor A1 in each battery pack of the multiple parallel battery packs and a current sensor A0 in the PDU module. Thus, even if the current sensor A1 in a battery pack fails, the current values ​​of multiple battery packs can still be acquired.

[0038] The above embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein. However, these modifications or replacements will not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A multi-pack parallel eVTOL battery pack current acquisition system, characterized by: The system comprises a battery pack module (1) and a PDU module (2), wherein the battery pack module (1) and the PDU module (2) are connected, the PDU module (2) and the DC to AC module (3) are connected, and the DC to AC module (3) and the load (4) are connected; The battery pack module (1) comprises a first battery pack (11), a second battery pack (12) and a third battery pack (13), and the positive electrodes of the first battery pack (11), the second battery pack (12) and the third battery pack are all connected to the PDU module (2); the negative electrodes of the first battery pack (11), the second battery pack (12) and the third battery pack are connected in parallel and then connected to the PDU module (2); The PDU module (2) is equipped with a current sensor A0. The negative electrodes of the first battery pack (11), the second battery pack (12), and the third battery pack are connected in parallel and then connected to the PDU module (2). The current sensor A0 is connected to the DC to AC module (3).

2. The multi-pack parallel eVTOL battery pack current acquisition system according to claim 1, characterized in that: The first battery pack (11) comprises a fuse (F1), four battery cells, a main positive relay (K2), a pre-charging circuit, a current sensor A1 and a main negative relay (K1); one end of the main positive relay (K2) is electrically connected to one end of the fuse F1, the other end of the main positive relay (K2) is electrically connected to the PDU module (2), the other end of the fuse F1 is electrically connected to the positive electrode of the first battery cell, the four battery cells are connected in series in sequence, the negative electrode of the fourth battery cell is electrically connected to one end of the current sensor A1, the other end of the current sensor A1 is electrically connected to one end of the main negative relay (K1), the other end of the main negative relay (K1) is electrically connected to the current sensor A0, and the pre-charging circuit is connected in parallel to both ends of the main positive relay (K2).

3. The multi-pack parallel eVTOL battery pack current acquisition system according to claim 2, characterized in that: The pre-charging circuit includes a pre-charging resistor (R1) and a pre-charging relay (K3); one end of the pre-charging resistor (R1) is electrically connected to one end of a fuse F1 and one end of a main positive relay (K2); the other end of the pre-charging resistor (R1) is electrically connected to one end of the pre-charging relay (K3); and the other end of the pre-charging relay (K3) is electrically connected to the other end of the main positive relay (K2).

4. The multi-pack parallel eVTOL battery pack current acquisition system according to claim 3, characterized in that: The first battery pack (11), the second battery pack (12), and the third battery pack (13) all have the same internal structure.

5. The multi-pack parallel eVTOL battery pack current acquisition system according to claim 4, characterized in that: The other end of the main negative relay (K1) of the first battery pack (11), the other end of the main negative relay (K1) of the second battery pack (12), and the other end of the main negative relay (K1) of the third battery pack (13) are connected in parallel and then electrically connected to the current sensor A0.

6. The multi-pack parallel eVTOL battery pack current acquisition system according to claim 5, characterized in that: The other end of the main positive relay (K2) of the first battery pack (11), the other end of the main positive relay (K2) of the second battery pack (12), and the other end of the main positive relay (K2) of the third battery pack (13) are all electrically connected to the PDU module (2).

7. The multi-pack parallel eVTOL battery pack current acquisition system according to claim 6, characterized in that: The DC to AC module (3) comprises four groups of DC / AC converters, the first ends of the four groups of DC / AC converters being electrically connected to one end of fuse F2, fuse F3, fuse F4 and fuse F5 in sequence, the other ends of fuse F2, fuse F3, fuse F4 and fuse F5 being electrically connected to the PDU module (2), and the second ends of the four groups of DC / AC converters being electrically connected to the other end of current sensor A0 after being connected in parallel.

8. The multi-pack parallel eVTOL battery pack current acquisition system according to claim 7, characterized in that: The load (4) includes a motor M1, a motor M2, a motor M3 and a motor M4, and the third terminals of the four groups of DC / AC converters are electrically connected to the motor M1, the motor M2, the motor M3 and the motor M4 respectively.

Images