Centralized master-slave power supply system and circuit

Abstract

The utility model belongs to the technical field of battery pack system integration, and particularly relates to a centralized master-slave power supply system and a circuit. The power supply system comprises battery branches and power distribution boxes, the power distribution boxes comprise N first power distribution boxes and one second power distribution box, each first power distribution box is provided with an output end and a battery input end, the battery input end is connected with the corresponding battery branch, the output end is connected with the input end of the second power distribution box, and the output end is connected with the output end of the first power distribution box. The output end of the second distribution box is connected with a load; n > = 2. A large-electric-quantity power supply can be realized by using an existing power distribution box, a new multi-branch power distribution box does not need to be developed, and an independent distributed power supply system is not adopted for independent power supply, so that an independent control strategy does not need to be designed for control, and the development cost is reduced; the rated voltage of the power supply is increased without high cost, the development cost is low, and the profit space is large.

Description

Technical Field

[0001] The utility model belongs to the technical field of battery pack system integration, and particularly relates to a centralized master-slave power supply system and circuit. Background Technique

[0002] With the development of construction machinery, the requirements for the charging speed and discharge power capacity of the power supply system are getting higher and higher, and there is an urgent need to develop a large-capacity power supply system. At present, there are mainly two technical routes to achieve a large-capacity power supply system: one is to increase the voltage of the power supply system, and the other is to increase the capacity of the power supply system. Among them, the technical solutions of centralized power supply systems or distributed power supply systems are generally adopted to increase the capacity of the power supply system. For example, when developing an 850KWh large-capacity power supply system, if taking the technical route of increasing the voltage of the power supply system, according to the current 4-branch lithium iron phosphate power supply system with a single-branch capacity of 230Ah, to achieve an 850KWh power supply system, the rated voltage needs to reach 1050V, which has a long development cycle, high cost investment, and the electrical components at the client side need to match a high-voltage power supply above 1000V, resulting in great development difficulty and high development cost at the client side; if taking the technical route of increasing the capacity of the power supply system, according to the current single-branch power supply with a rated voltage of 750V and a capacity of 230Ah, to achieve an 850KWh power supply system, a 6-branch power supply system needs to be developed. If a centralized power supply system is adopted, 6 battery branches need to be gathered through a 6-branch high-voltage distribution box, and this scheme requires the new development of a 6-branch high-voltage distribution box, which has a long development cycle, a large volume of the distribution box, and high development cost; if a distributed power supply system is adopted, 2 high-voltage distribution boxes need to be used, each high-voltage distribution box is connected to 3 battery branches, and 2 sets of independent 3-branch power supply systems are used to supply power to the load respectively. This scheme requires the client to match 2 sets of independent drive systems, the control is relatively complex, and the development requirements for the control strategy are high, resulting in higher development costs. Content of the Utility Model

[0003] The purpose of the utility model is to provide a centralized master-slave power supply system and circuit, so as to solve the problem of relatively high development cost of the existing large-capacity power supply system.

[0004] The utility model provides a centralized master-slave power supply system for solving the above technical problems, which includes battery branches and distribution boxes. The distribution boxes include a first distribution box and a second distribution box. The number of the first distribution boxes is N, and the number of the second distribution boxes is 1. Each first distribution box is provided with an output end and a battery input end, wherein the battery input end is connected to the corresponding battery branch, and the output end is connected to the input end of the second distribution box. The output end of the second distribution box is used to connect to the load; N≥2.

[0005] Further, the distribution box is controlled by a control module, which includes a main BMU and slave BMUs. The main BMU is used to control the connection of one of the first distribution boxes, and the slave BMUs are used to control the connection of the second distribution box and the remaining first distribution boxes.

[0006] Further, at least two charging circuits are also connected to the first distribution box, and after being connected in parallel, the charging circuits serve as a charging interface.

[0007] Further, the battery input end of each first distribution box includes at least two groups of ports, and each group of ports is correspondingly connected to a battery branch.

[0008] Further, the main BMU and the slave BMUs are powered by a control power supply and / or a DC / DC conversion module, and the DC / DC conversion module is arranged in the first distribution box controlled by the main BMU.

[0009] Further, each first distribution box is also provided with a Hall sensor for detecting the current of the corresponding connected battery branch.

[0010] The beneficial effects of the above technical solutions are as follows: The present utility model is an improved invention. It adopts a technical route to increase the capacity of the power supply system, and uses a centralized master-slave architecture to build a large-capacity power supply system. The battery input end of each first distribution box is connected to each battery branch, and the output end is connected to the input end of the second distribution box. The battery output end of the first distribution box is used to connect the load. That is, after the power of each battery branch is collected by the first distribution box, the power sources composed of the first distribution boxes are connected in parallel through a second distribution box and then jointly supplied to the load. A large-capacity power supply can be realized by using the existing distribution box without developing a new multi-branch distribution box. And since an independent distributed power supply system is not used for independent power supply, there is no need to design an independent control strategy for control, reducing the development cost; there is no need to invest a high cost to increase the rated voltage of the power supply, with less investment in development costs and a large profit margin.

[0011] To solve the above technical problems, the present utility model also provides a centralized master-slave power circuit, which includes a distribution box. The distribution box includes a first distribution box and a second distribution box. The number of the first distribution boxes is N, and the number of the second distribution boxes is 1. Each first distribution box is provided with an output end and a battery input end, where the battery input end is used to connect the corresponding battery branch, and the output end is connected to the input end of the second distribution box. The output end of the second distribution box is used to connect the load; N≥2.

[0012] Further, at least two charging circuits are also connected to the first distribution box, and after being connected in parallel, the charging circuits serve as a charging interface.

[0013] Further, the battery input end of each first distribution box includes at least two groups of ports, and each group of ports is used to correspondingly connect a battery branch.

[0014] Furthermore, each first power distribution box is also provided with a Hall sensor for detecting the current of the corresponding battery branch connected thereto.

[0015] The beneficial effects of the above technical solutions are as follows: The present utility model is an improved invention. It adopts the technical route of increasing the capacity of the power supply system, and uses a centralized master-slave architecture to build a large-capacity power supply system. The battery input end of each first power distribution box is connected to each battery branch, and the output end is connected to the input end of the second power distribution box. The battery output end of the first power distribution box is used to connect the load. That is, after the power of each battery branch is collected by the first power distribution box, the power composed of the first power distribution boxes is paralleled through a second power distribution box and then jointly supplied to the load. A large-capacity power supply can be achieved by using the existing power distribution box without developing a new multi-branch power distribution box. And since an independent distributed power supply system is not used for independent power supply, there is no need to design an independent control strategy for control, which reduces the development cost; there is no need to invest a high cost in increasing the rated voltage of the power supply, the development cost investment is small, and the profit space is large. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 is a schematic diagram of a centralized master-slave power circuit of an embodiment of the power supply system of the present utility model;

[0017] Figure 2 is a functional block diagram of a power distribution box of an embodiment of the power supply system of the present utility model;

[0018] Figure 3 is a schematic diagram of the electrical architecture of a control module of an embodiment of the power supply system of the present utility model;

[0019] Figure 4 is a schematic diagram of the intranet communication topology of an embodiment of the power supply system of the present utility model. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0020] In order to make the objectives, technical solutions and advantages of the present utility model clearer, the following further describes the specific embodiments of the present utility model with reference to the accompanying drawings.

[0021] The present utility model adopts the technical route of increasing the capacity of the power supply system, and uses a centralized master-slave architecture to build a large-capacity power supply system. The battery input end of each first power distribution box is connected to each battery branch, and the output end is connected to the input end of the second power distribution box. The battery output end of the first power distribution box is used to connect the load. That is, after the power of each battery branch is collected by the first power distribution box, the power composed of the first power distribution boxes is paralleled through a second power distribution box and then jointly supplied to the load. A large-capacity power supply can be achieved by using the existing power distribution box without developing a new multi-branch power distribution box. And since an independent distributed power supply system is not used for independent power supply, there is no need to design an independent control strategy for control, which reduces the development cost; there is no need to invest a high cost in increasing the rated voltage of the power supply, the development cost investment is small, and the profit space is large.

[0022] Power supply system embodiment

[0023] The utility model provides a centralized master-slave power supply system, which includes a centralized master-slave power supply circuit, a battery branch and a control module. The centralized master-slave power supply circuit includes a distribution box, and the distribution box includes a first distribution box and a second distribution box. The number of the first distribution boxes is N, and the number of the second distribution boxes is 1. Each first distribution box is provided with an output end and a battery input end, wherein the battery input end is used for connecting the corresponding battery branch, and the output end is connected to the input end of the second distribution box. The output end of the second distribution box is used for connecting a load; N≥2. The battery branch is composed of a plurality of battery boxes connected in series. Each battery input end of the first distribution box includes at least two groups of ports, and each group of ports includes a positive terminal port and a negative terminal port. Each group of ports is correspondingly connected to a battery branch, and each battery branch accesses the positive and negative terminal ports to form a loop with the first distribution box. At least one battery box in each battery branch is provided with a fuse. The battery branches connected to each first distribution box are in parallel. The number of battery branches connected to the first distribution box and the number of battery boxes connected in series in each battery branch are determined according to the actual situation. The first distribution box is also connected with at least two charging circuits, and the charging circuits are in parallel to form a charging interface. Since the second distribution box adopts an existing distribution box with a charging port provided thereon, and the power supply system of the utility model is charged through the charging interface connected by the first distribution box, the charging end of the second distribution box can be blocked and not used.

[0024] In a specific embodiment, when developing an 850KWh large-capacity power supply system, according to the current single-branch power supply with a rated voltage of 750V and a capacity of 230Ah, to achieve an 850KWh power supply system, a 6-branch power supply system needs to be developed. The utility model adopts 2 first distribution boxes and 1 second distribution box. The first distribution box is a 322 distribution box (that is, including 3 battery inputs, 2 outputs, and 2 charging circuits), and the second distribution box is a 422 distribution box (that is, including 4 battery inputs, 2 outputs, and 2 charging circuits). The high-voltage power supply circuit of the centralized master-slave 850KWh power supply system is as Figure 1As shown in the figure: The battery input terminal of each 322 power distribution box is connected to the battery branch composed of the battery box (C), and the output terminal is connected to the battery input terminal of the 422 power distribution box. The 422 power distribution box outputs the power sources where the two 322 power distribution boxes are located in parallel to the load. Among them, the two charging circuits of each 322 power distribution box are connected in parallel to the charging port of a charging socket, thereby improving the charging efficiency. And after a charging relay in one of the charging circuits fails, there is no need to replace the charging interface, and charging can be directly carried out through the other charging circuit. The two output terminals of the 422 power distribution box are connected to the vehicle load, and the charging terminal is blocked and not used. The models of the first power distribution box and the second power distribution box can be selected according to the actual capacity requirements, and the quantity can be expanded according to the actual usage requirements. There is no need to re-develop the power distribution box or design a distributed control strategy, the response cycle of the hardware materials is short, the development cost investment is small, and the profit space is large.

[0025] The functions of the first power distribution box and the second power distribution box are as Figure 2 shown. Each first power distribution box (the high-voltage power distribution box 1 and the high-voltage power distribution box 2 in the figure) is provided with a Hall sensor Hal for detecting the current of each battery branch connected correspondingly. The Hall sensor sends the collected current information to the main BMU or the slave BMU. Taking the 850KWh large-capacity power system as an example above, the high-voltage power distribution box 1 is correspondingly connected to the battery branches 1-3, and the correspondingly set Hall sensor numbers are Hal1-Hal3, and the charging interface is connected to the charging seat of gun 1; the high-voltage power distribution box 2 is correspondingly connected to the battery branches 4-6, and the correspondingly set Hall sensor numbers are Hal4-Hal6, and the charging interface is connected to the charging seat of gun 2; the first power distribution box controlled by the main BMU is also provided with a DC / DC conversion module for 24-hour monitoring, and the first power distribution box and the second power distribution box controlled by the slave BMU do not have a DC / DC conversion module. The DC / DC conversion module is used to wake up the BMS regularly to detect the battery state in real time when the vehicle is not in the running and charging states, and to supply power to the main BMU and the slave BMU after being connected in parallel with the control power source. An anti-reverse diode is provided on the power supply line.

[0026] The low-voltage control module architecture is as Figure 3As shown in the figure, it includes a main BMU, a slave BMU, and a high-voltage detection unit HVU. The main BMU is used to control a certain first distribution box (such as the high-voltage distribution box 1), and the slave BMU is used to control the second distribution box and the remaining first distribution boxes (such as the high-voltage distribution box 2). Each battery branch corresponding to each first distribution box is provided with a CSC (battery monitoring circuit) to monitor the voltage and temperature information of each battery branch. The high-voltage detection unit includes a first high-voltage detection unit HVU1, a second high-voltage detection unit HVU2, and a third high-voltage detection unit HVU3; the first high-voltage detection unit is controlled by the main BMU, and the second high-voltage detection unit and the third detection unit are controlled by the slave BMU. Among them, the main BMU and the slave BMU are powered by a control power supply and / or a DC / DC conversion module. The control power supply (the vehicle battery can be used) and the outputs of the DC / DC modules are connected in parallel and introduced into the main BMU and the slave BMU, and any power input can supply power to the main BMU and the slave BMU.

[0027] After the main BMU is powered on, it enters the working state when the DC / DC output detection is effective, the Charger A+ detection of the charging gun is effective, or a 24V control signal (such as the vehicle power-on signal) is detected. After the main BMU works, it drives and controls the CSC and HVU1 to be powered. After the main BMU works, it activates the slave BMU. After the slave BMU works, it drives and controls HVU2 and HVU3 to be powered. The main BMU and the slave BMU are also used for charging control, including at least one of the charging gun CC2 detection, the charging socket temperature detection, the charging relay drive control, and the charging message interaction.

[0028] Specifically, the main BMU is used for the detection of the charging gun 1 CC2 (Charging Connection Confirmation 2, the second charging connection confirmation interface), the charging socket temperature detection of the charging gun 1, the drive control of the four-way charging relay of the charging gun 1, the communication message interaction and processing of the charging gun 1, and is also responsible for the information interaction and processing between the main and slave BMUs and the vehicle VCU, and realizes the OTA (Over-The-Air) function through the main BMU debugging port.

[0029] The slave BMU is used for the detection of the charging gun 2 CC2, the charging socket temperature detection of the charging gun 2, the drive control of the four-way charging relay of the charging gun 2, the communication message interaction and processing of the charging gun 2, and is also responsible for the information interaction and processing between the main and slave BMUs.

[0030] HVU1 is used for the detection of the charging relay of the gun 1 corresponding to the first distribution box controlled by the main BMU, the loop interlock detection, the total voltage detection of the power system, and the insulation detection, and also supplies power to the Hall sensors of the 1-3 branches.

[0031] HVU2 is used for detecting the charging relay and loop interlock detection corresponding to the first power distribution box controlled by the BMU, and also powers the Hall sensors of 4 to 6 branches.

[0032] HVU2 is used for loop interlock detection corresponding to the third power distribution box.

[0033] The main BMU, slave BMU, CSC, HVU, Hall sensors, and DC / DC conversion module perform message interaction internally through the CAN bus. As Figure 4 shown, the first power distribution box (such as high-voltage power distribution box 1 and high-voltage power distribution box 2) serves as the main network, with a 120Ω terminal resistor that matches the network topology impedance, and other devices are connected to the internal network CAN bus as branch networks.

[0034] Power circuit embodiment

[0035] The present utility model provides a centralized master-slave power circuit, which has been described in detail in the power system embodiment and will not be elaborated here.

Claims

1. A centralized master-slave power supply system, comprising a battery branch and a distribution box, characterized in that: The distribution box includes a first distribution box and a second distribution box, the number of the first distribution boxes is N, the number of the second distribution boxes is 1, each first distribution box is provided with an output end and a battery input end, wherein the battery input end is connected to the corresponding battery branch, the output end is connected to the input end of the second distribution box, and the output end of the second distribution box is used to connect the load; N≥2.

2. The centralized master-slave power supply system according to claim 1, characterized in that: The distribution box is controlled by a control module, which includes a master BMU and a slave BMU. The master BMU is used to control the connection to one of the first distribution boxes, and the slave BMU is used to control the connection to the second distribution box and the remaining first distribution boxes.

3. The centralized master-slave power supply system according to claim 1, characterized in that: The first power distribution box is also connected to at least two charging circuits, and the charging circuits are connected in parallel to serve as charging interfaces.

4. The centralized master-slave power supply system according to claim 1, characterized in that: Each battery input terminal of the first power distribution box includes at least two groups of ports, and each group of ports is correspondingly connected to a battery branch.

5. The centralized master-slave power supply system according to claim 2, characterized in that: The master BMU and the slave BMU are powered by a control power supply and / or a DC / DC conversion module, and the DC / DC conversion module is arranged in a first power distribution box controlled by the master BMU.

6. The centralized master-slave power supply system according to claim 1, characterized in that: Each first power distribution box is also provided with a Hall sensor for detecting the current of the corresponding battery branch connected thereto.

7. A centralized master-slave power supply circuit, comprising a distribution box, characterized in that: The distribution box includes a first distribution box and a second distribution box, the number of the first distribution boxes is N, the number of the second distribution boxes is 1, each first distribution box is provided with an output end and a battery input end, wherein the battery input end is used to connect the corresponding battery branch, the output end is connected to the input end of the second distribution box, and the output end of the second distribution box is used to connect the load; N≥2.

8. The centralized master-slave power supply circuit according to claim 7, characterized in that: The first power distribution box is also connected to at least two charging circuits, and the charging circuits are connected in parallel to serve as charging interfaces.

9. The centralized master-slave power supply circuit according to claim 7, characterized in that: Each battery input terminal of the first power distribution box includes at least two groups of ports, and each group of ports is used to connect to a corresponding battery branch.

10. The centralized master-slave power supply circuit according to claim 7, characterized in that: Each first power distribution box is also provided with a Hall sensor for detecting the current of the corresponding battery branch connected thereto.

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