Power supply device and high-voltage system for construction machinery

Abstract

The utility model relates to a power supply device for engineering machinery and a high-voltage system comprising the same. The power supply device includes: a plurality of battery packs; the at least one charging switch is arranged between the charging ports of the plurality of battery packs and an external charging pile; a power distribution unit provided between the discharge ports of the plurality of battery packs and the plurality of loads; and a control chip configured to switch on the at least one charging switch under a charging condition and switch on a corresponding current path in the power distribution unit under a discharging condition. According to the power supply device, the two independent battery packs are integrated into a whole, accurate control over different electric appliances can be achieved, the overall energy utilization efficiency is improved, in addition, due to the fact that the two battery packs can be independently charged, the charging process can be quicker, and the charging efficiency is improved. And the application requirements of engineering machinery of different types and scales can be met.

Description

Technical Field

[0001] The utility model relates to the field of engineering machinery, and more specifically, to a power supply device for engineering machinery, and a high-voltage system comprising the power supply device. Background Art

[0002] In the past few years, electrification technology has gradually become popular in the field of construction machinery, mainly due to its advantages in energy conservation and emission reduction, lower operating costs and improved equipment performance. However, compared with the automotive industry, large-scale construction machinery has higher energy consumption and requires extremely high-capacity power batteries to meet the requirements of continuous operation for a certain period of time. In this case, charging time becomes a key issue. Limited by the charging power, a large-capacity power battery means a longer charging time, which will lead to a reduction in operating time, thus affecting the progress and efficiency of the project. Therefore, how to shorten the charging time to an acceptable level has become an urgent problem to be solved in the construction machinery industry.

[0003] Currently, one of the ways to improve charging efficiency is to increase the platform voltage of the high-voltage system. By increasing the platform voltage, the charging time can be reduced to a certain extent. However, since high-voltage components suitable for high-voltage platforms are not popular, this means that more R&D resources and costs need to be invested in implementing this solution. In addition, even if the platform voltage is increased, the charging time may still be difficult to meet actual needs when faced with higher power requirements.

[0004] In summary, existing high-voltage systems in construction machinery are facing challenges in terms of improving charging efficiency and shortening charging time. Therefore, it is urgent to provide an innovative solution that can achieve fast charging in large construction machinery in a safe and cost-effective manner. Utility Model Content

[0005] In view of the above problems existing in the high-voltage system of existing engineering machinery, the utility model proposes a dual power supply device suitable for the structural characteristics of engineering machinery to meet the fast charging needs of large-scale engineering machinery under high energy consumption conditions. The system includes two independent power supplies, which are used to provide power to different loads. The two power supplies can be charged independently, so that the charging time requirements can still be met in the case of a large overall power consumption.

[0006] A first aspect of the utility model provides a power supply device for an engineering machine, the power supply device is used to provide electric energy to a plurality of loads in the engineering machine, the power supply device comprises:

[0007] A plurality of battery packs, each battery pack comprising a charging port selectively connected to an external charging station and a discharging port selectively connected to the plurality of loads;

[0008] At least one charging switch, the at least one charging switch is arranged between the charging ports of the plurality of battery packs and an external charging pile;

[0009] a power distribution unit provided between discharge ports of the plurality of battery packs and the plurality of loads; and

[0010] A control chip, wherein the control chip is configured to connect the at least one charging switch under a charging condition to charge a corresponding battery pack among the multiple battery packs with the help of an external charging pile, and to connect the corresponding current path in the power distribution unit under a discharging condition to provide electrical energy to the multiple loads with the help of a corresponding battery pack among the multiple battery packs.

[0011] According to an optional embodiment, the multiple battery packs include a first battery pack for providing electrical energy to at least one first load among the multiple loads and a second battery pack for providing electrical energy to at least one second load among the multiple loads, and the at least one charging switch includes a first charging switch connected between the charging port of the first battery pack and an external charging pile, and a second charging switch connected between the charging port of the second battery pack and the external charging pile.

[0012] According to an optional embodiment, the power distribution unit includes a first switching circuit, a second switching circuit and a contactor, wherein the first end of the first switching circuit is connected to the discharge port of the first battery pack, the second end of the first switching circuit is connected to the at least one first load, the first end of the second switching circuit is connected to the discharge port of the second battery pack, the second end of the second switching circuit is connected to the at least one second load, and the contactor is connected between the second end of the first switching circuit and the second end of the second switching circuit.

[0013] According to an optional embodiment, the control chip is configured to connect the first switch circuit and the second switch circuit and disconnect the contactor under a discharge condition.

[0014] According to an optional embodiment, the device also includes a first power monitoring module and a second power monitoring module, which are respectively used to monitor the remaining power of the first battery group and the second battery group in real time under discharge conditions, wherein the control chip is further configured to adjust the connection status of the first switching circuit, the second switching circuit and the contactor in the power distribution unit based on the remaining power of the first battery group and the second battery group.

[0015] According to an optional embodiment, the control chip is further configured to disconnect the first switch circuit and connect the second switch circuit and the contactor when the remaining power of the first battery pack is lower than a first threshold and the remaining power of the second battery pack is higher than a second threshold, so as to provide power to all loads with the help of the second battery pack.

[0016] According to an optional embodiment, the first switch circuit and the second switch circuit respectively include a pre-charging circuit and a main relay connected in parallel with the pre-charging circuit.

[0017] According to an optional embodiment, the at least one first load includes an air-conditioning compressor, a heater, a hydraulic motor, and a starting battery, and the at least one second load includes a drive motor.

[0018] According to an optional embodiment, the control chip is further configured to connect the at least one charging switch and the first switch circuit, and disconnect the second switch circuit and the contactor under a charging condition.

[0019] The second aspect of the present invention further provides a high-voltage system for engineering machinery, the high-voltage system comprising:

[0020] Multiple loads; and

[0021] A power supply apparatus as described above.

[0022] Compared with the traditional single power supply system, the power supply device and high-voltage system of the utility model have significant advantages. They can greatly improve the charging efficiency while ensuring the stability of the high-voltage system in the engineering machinery, thereby shortening the operation time. First, by integrating two independent battery packs into a whole, the utility model can realize precise control of different electrical appliances. This design can significantly improve the charging efficiency, so that in the case of large overall power, the charging time can be effectively shortened to meet the needs of engineering operations. Secondly, the dual power supply device of the utility model works independently of each other in most cases, avoiding the problem of excessive voltage differences that may occur in the power parallel system, thereby ensuring the stability and reliability of the system. Finally, most of the high-voltage devices used in the dual power supply device of the utility model are general devices on the market, which makes device selection easy and reduces production costs and maintenance difficulties. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] By incorporating the accompanying drawings and Figure 1 With reference to the specific implementation modes used to illustrate certain principles of the present invention, other features and advantages of the method of the present invention will become clear or be described in more detail.

[0024] Figure 1A circuit diagram of a power supply device according to an exemplary embodiment of the present utility model is shown. DETAILED DESCRIPTION

[0025] The power supply device for construction machinery according to the utility model will be described below with reference to the accompanying drawings and by way of example. In the following description, many specific details are set forth so that the technical personnel in the relevant technical field can more fully understand the utility model. However, it is obvious to the technical personnel in the relevant technical field that the implementation of the utility model may not have some of these specific details. On the contrary, it is contemplated to implement the utility model with any combination of the following features and elements, regardless of whether they relate to different embodiments. Therefore, the following various aspects, features, embodiments and advantages are for illustrative purposes only and should not be regarded as elements or limitations of the claims unless explicitly stated in the claims.

[0026] In view of the problems existing in the high-voltage system of existing engineering machinery, the utility model proposes a dual power supply device suitable for the structural characteristics of engineering machinery to meet the fast charging needs of large-scale engineering machinery under high energy consumption conditions.

[0027] Figure 1 A circuit diagram of a power supply device according to an exemplary embodiment of the utility model is shown. This embodiment proposes to divide the high-voltage batteries in the construction machinery into two groups, respectively providing electrical energy to different high-voltage electrical appliances (also called "high-voltage loads"), and the two groups of high-voltage systems operate independently. The power of the two battery groups is distributed according to the energy consumption of the electrical appliances to achieve a battery life close to each other. In addition, a power distribution device (also called a power distribution unit, or "PDU" for short) is designed for the two battery groups. When the power of one battery group is extremely low and the power of the other battery group is still high, the power distribution device can control the entire system to be powered by the battery group with higher power, and stop the power supply of the battery group with lower power at the same time.

[0028] Refer to the following Figure 1 The internal structure of the dual power supply device and its connection relationship with the external charging pile and the electrical appliances (also called "load") in the construction machinery are introduced in detail.

[0029] like Figure 1 As shown in the figure, the two battery packs are BAT1 and BAT2, which can be charged using two guns respectively, and the charging processes of the two are independent of each other. For example, BAT1 can be used to provide power for the air-conditioning compressor AC, the heater PTC, the hydraulic motor M_HYD and the starting battery B (which can be, for example, a 24V battery in the engineering machinery) in the engineering machinery, and BAT2 can be used to provide power for the drive motor M_DRV.

[0030] It is understandable that, in this article, "providing electric energy to electrical appliances" does not mean that the corresponding electrical appliances must be directly connected to the corresponding battery pack, but a converter, a fuse, a controller, etc. may be provided between the two. For example, a DC / DC converter is provided between the battery pack BAT1 and the starting battery BAT_24, and BAT1 indirectly provides energy for the operation of the hydraulic motor M_HYD by supplying power to the controller MCU_HYD of the hydraulic motor M_HYD. Similarly, BAT2 also indirectly provides energy for the operation of the drive motor M_DRV by supplying power to the controller MCU_DRV of the drive motor M_DRV.

[0031] The power distribution of BAT1 and BAT2 is based on the power normally consumed by the electrical appliances. In most working conditions, the continuous operation time of the two battery packs is the same. Normally, BAT1 and BAT2 provide power to their respective electrical appliances. When the remaining power of one battery pack (such as BAT1) is too low and the remaining power of the other battery pack (such as BAT2) is still high, the battery pack with low power can be turned off, and only the other battery pack with high power can be used to power the entire high-voltage system of the construction machinery. Figure 1 By controlling the connection status of the contactors Main+Rly-1, Main+Rly-2, Main+Rly-3, Main-Rly-3, etc., you can flexibly select two battery packs to power their respective electrical appliances, or select one of the battery packs to power the entire system. In addition, the charging process between the two battery packs is completely independent, and two independent dual-gun charging piles (C_INLET1, C_INLET2) can be used to charge the two battery packs, and the two battery packs have no special requirements for the charging power, and the charging power does not need to be the same each time.

[0032] The two battery packs BAT1 and BAT2 respectively include a charging port selectively connected to an external charging pile (which can be, for example, a dual-gun charging pile) and a discharge end selectively connected to multiple loads in the engineering machinery. In order to control the charging process of the battery pack, a corresponding charging switch is provided between the dual-gun charging pile and each battery pack BAT1 or BAT2. For example, charging switches CHG1+, CHG1- and CHG2+, CHG2- may be provided between the charging port of the battery pack BAT1 or BAT2 and the external (dual-gun) charging pile. In addition, in order to distribute power between the battery packs BAT1, BAT2 and multiple high-voltage loads, the power supply device also includes a power distribution unit PDU, which is provided between the discharge ports of the battery packs BAT1, BAT2 and the loads.

[0033] In order to control the charging and discharging of the battery pack, the power supply device also includes a control chip ( Figure 1(not shown in the figure), the control chip can be configured to: turn on the corresponding charging switch under charging conditions to charge the battery packs BAT1 and / or BAT2 with the help of an external charging pile; and, turn on the corresponding current path in the power distribution unit under discharging conditions to provide electrical energy to the corresponding loads with the help of the battery packs BAT1 and / or BAT2.

[0034] Specifically, the power distribution unit may include a first switch circuit, a second switch circuit, and contactors Main+Rly-3 and Main-Rly-3. The first end of the first switch circuit is connected to the discharge port of the battery pack BAT1, the second end of the first switch circuit is connected to at least one load (for example, the air conditioning compressor AC, the heater PTC, the hydraulic motor M_HYD or the starter battery BAT_24), the first end of the second switch circuit is connected to the discharge port of the battery pack BAT2, the second end of the second switch circuit is connected to another load (for example, the drive motor M_DRV), and the contactors Main+Rly-3 and Main-Rly-3 are connected between the second end of the first switch circuit and the second end of the second switch circuit.

[0035] Among them, the first switch circuit includes a pre-charging circuit and a main relay Main+Rly-1 connected in parallel with the pre-charging circuit. The pre-charging circuit is composed of, for example, a pre-charging relay Pre-CHG Rly-1 and a pre-charging resistor Pre-CHG-R. Similarly, the second switch circuit includes a pre-charging circuit and a main relay Main+Rly-1 connected in parallel with the pre-charging circuit. The pre-charging circuit is composed of, for example, a pre-charging relay Pre-CHG Rly-2 and a pre-charging resistor Pre-CHG-R.

[0036] In the discharge condition, the first switch circuit and the second switch circuit can be turned on by the control chip, and the contactors Main+Rly-3 and Main-Rly-3 can be turned off. In the charging condition, the corresponding charging switches CHG1+, CHG1-, CHG2+, CHG2- and the first switch circuit can be turned on by the control chip, and the second switch circuit and the contactor can be turned off.

[0037] According to an optional embodiment, the power supply device may also include two power monitoring modules (which may be implemented, for example, by a Hall sensor H), respectively used to monitor the remaining power of the battery packs BAT1 and BAT2 in real time under discharge conditions, wherein the control chip may adjust the connection status of each part (i.e., the first switch circuit, the second switch circuit, and the contactor) in the power distribution sheet based on the remaining power of the battery packs BAT1 and BAT2. For example, when the remaining power of the battery pack BAT1 is lower than the first threshold and the remaining power of the battery pack BAT2 is higher than the second threshold, the control chip may disconnect the first switch circuit and connect the contactor to supply power to all loads with the help of the battery pack BAT2.

[0038] An exemplary embodiment of the present utility model further relates to a high voltage system of an engineering machine, the high voltage system comprising: a plurality of loads; and the power supply device as described above.

[0039] Combine the following Figure 1 To describe the working process of the power supply device of the utility model, it is assumed that the battery pack BAT1 is used to provide power for the air conditioning compressor AC, the heater PTC, the hydraulic motor M_HYD (especially its controller MCU_HYD) and the starting battery BAT_24 (especially a 24V battery connected via a DC / DC converter), and the battery pack BAT2 is used to provide power for the drive motor M_DRV (especially its controller MCU_DRV).

[0040] Under the discharge condition, the control chip first closes the Main-contactor in BAT1, and then completes the pre-charging through the pre-charging circuit (i.e., connects the pre-charging relay Pre-CHG Rly-1 and the pre-charging resistor Pre-CHG-R), and then closes the main relay Main+Rly-1, thus completing the power-on process of the construction machinery to discharge the corresponding high-voltage load. Under the charging condition, the battery pack BAT1 is charged using a double-gun charging pile, and at the same time, the battery pack BAT1 is also discharged to the outside, especially using the DC / DC to supplement the 24V battery.

[0041] The discharge process of battery pack BAT2 is exactly the same as that of BAT1. It also uses an independent dual-gun charging pile for charging. The difference is that BAT2 will not discharge externally during the charging process.

[0042] Assuming that the voltage platform of battery packs BAT1 and BAT2 is the same, but the battery capacity is different, the specific power distribution needs to be allocated according to the average power of each electrical appliance. For example, the average power of the electrical appliances at the back end of BAT1 is 60Kw, and the average power of the electrical appliances at the back end of BAT2 is 120Kw, then the power ratio of BAT1 and BAT2 can be set to 1:2. In this way, under most working conditions, the time it takes for the two battery packs to discharge to the point where they need to be charged is close to each other.

[0043] Under special working conditions, one battery pack may consume too much power while the other battery pack still has a lot of power left. For example, BAT1 only has 10% power left, while BAT2 has 40% power left. At this time, the control chip needs to send a prompt signal to the vehicle controller VCU to remind the driver to power off the vehicle first and then power it back on. When the construction machinery is powered on again, the control chip will control the contactors Main+Rly-3 and Main-Rly-3 to close, so that BAT2 can power the entire load system, and BAT1 will no longer supply power.

[0044] In the above, the internal structure of the power supply device according to the present invention is introduced by taking two battery packs BAT1 and BAT2 as an example. However, it can be understood that the power supply device can also have other numbers of battery packs, such as three or more. All these variations fall within the protection scope of the present invention.

[0045] The advantages of the power supply device according to the utility model lie in its flexibility and high efficiency: by integrating two independent battery packs into a whole, precise control of different electrical appliances can be achieved, thereby improving the overall energy utilization efficiency; in addition, since the two battery packs can be charged independently of each other, the charging process can be faster, which helps to further shorten the charging time; finally, this design also has a certain degree of scalability, and the system can be adjusted and optimized according to actual needs to meet the application needs of construction machinery of different types and sizes.

[0046] Although some aspects of the present invention have been presented and discussed, those skilled in the art will appreciate that the above aspects may be modified without departing from the principles and spirit of the present invention, and therefore the scope of the present invention shall be defined by the claims and their equivalents. Furthermore, terms such as "first" and "second" do not indicate the order of units or values ​​in terms of time, space, size, etc., but are merely used to distinguish between units or values.

Claims

1. A power supply device for engineering machinery, the power supply device is used to provide electric energy to multiple loads in the engineering machinery, characterized in that: The power supply device comprises: A plurality of battery packs, each battery pack comprising a charging port selectively connected to an external charging station and a discharging port selectively connected to the plurality of loads; At least one charging switch, the at least one charging switch is arranged between the charging ports of the plurality of battery packs and an external charging pile; a power distribution unit provided between discharge ports of the plurality of battery packs and the plurality of loads; and A control chip, wherein the control chip is configured to connect the at least one charging switch under a charging condition to charge a corresponding battery pack among the multiple battery packs with the help of an external charging pile, and to connect the corresponding current path in the power distribution unit under a discharging condition to provide electrical energy to the multiple loads with the help of a corresponding battery pack among the multiple battery packs.

2. The power supply device according to claim 1, characterized in that: The multiple battery packs include a first battery pack for providing electrical energy to at least one first load among the multiple loads and a second battery pack for providing electrical energy to at least one second load among the multiple loads, and the at least one charging switch includes a first charging switch connected between a charging port of the first battery pack and an external charging pile, and a second charging switch connected between a charging port of the second battery pack and an external charging pile.

3. The power supply device according to claim 2, characterized in that: The power distribution unit includes a first switching circuit, a second switching circuit and a contactor, wherein the first end of the first switching circuit is connected to the discharge port of the first battery pack, the second end of the first switching circuit is connected to the at least one first load, the first end of the second switching circuit is connected to the discharge port of the second battery pack, the second end of the second switching circuit is connected to the at least one second load, and the contactor is connected between the second end of the first switching circuit and the second end of the second switching circuit.

4. The power supply device according to claim 3, characterized in that: The control chip is configured to connect the first switch circuit and the second switch circuit and disconnect the contactor under a discharge condition.

5. The power supply device according to claim 3 or 4, characterized in that: The device also includes a first power monitoring module and a second power monitoring module, which are respectively used to monitor the remaining power of the first battery group and the second battery group in real time under discharge conditions, wherein the control chip is further configured to adjust the connection status of the first switching circuit, the second switching circuit and the contactor in the power distribution unit based on the remaining power of the first battery group and the second battery group.

6. The power supply device according to claim 5, characterized in that: The control chip is further configured to disconnect the first switch circuit and connect the second switch circuit and the contactor when the remaining power of the first battery pack is lower than a first threshold and the remaining power of the second battery pack is higher than a second threshold, so as to provide power to all loads with the help of the second battery pack.

7. The power supply device according to claim 3 or 4, characterized in that: The first switch circuit and the second switch circuit respectively include a pre-charging circuit and a main relay connected in parallel with the pre-charging circuit.

8. The power supply device according to claim 3 or 4, characterized in that: The at least one first load includes an air-conditioning compressor, a heater, a hydraulic motor, and a starting battery, and the at least one second load includes a driving motor.

9. The power supply device according to claim 3 or 4, characterized in that: The control chip is further configured to connect the at least one charging switch and the first switch circuit, and disconnect the second switch circuit and the contactor under a charging condition.

10. A high-voltage system for engineering machinery, characterized in that: The high-voltage system comprises: Multiple loads; and A power supply device according to any one of claims 1 to 9.

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