All-in-one integrated boost device and integration method thereof

Abstract

The present invention discloses an all-in-one integrated boost device and an integration method thereof. The all-in-one integrated boost device integration method includes step S1: when the external charging device is a low-voltage charging pile, the charging mode switching device turns on the first switch S1, so that the low-voltage charging pile pre-charges the input capacitor Cin, and then connects to the center point of the motor winding through the boost inductor L1 and the first switch S1 in sequence, and then stores energy and filters the bus capacitor C_dclink through the power module. The all-in-one integrated boost device and the integration method thereof disclosed in the present invention adopt an integrated approach, making it compact in structure and small in size, which will greatly save space in the motor controller. The input capacitor Cin, bus capacitor C_dclink, EMC filter, boost inductor L1, switches S1, S2 and housing are integrated together, making the motor controller structure more compact and smaller in size, thereby saving costs.

Description

Technical Field

[0001] The present invention belongs to the technical field of electric vehicle boosting, and in particular relates to an all-in-one integrated boosting device and an all-in-one integrated boosting device integration method. Background Art

[0002] In recent years, electric vehicles have become increasingly mainstream. To meet demand for fast charging and extended range, models with 800V high-voltage platforms have emerged. However, traditional chargers for fast charging typically operate at 400V, necessitating a voltage boost device to raise the voltage of the external charger to charge the battery pack.

[0003] Currently, some 800V high-voltage platform vehicles on the market use large-capacity boosters to increase the voltage from 400V to 800V. These devices are not only heavy and bulky, but also expensive. Therefore, installing a dedicated booster in the vehicle would reduce vehicle space and increase the price.

[0004] Currently, some 800V high-voltage platform models on the market use motor winding charging methods, which use the motor coils and inverter switching elements to increase the voltage input from the external charging device to a voltage level that can charge the battery. However, the inductance of the motor winding is limited, resulting in large input and output voltage ripple and current ripple, which has a significant impact on the heating of key components in the motor and motor controller. Its electrical architecture is as follows Figure 4 As shown in FIG, after the switch S1 is closed, the voltage is boosted through the motor winding, IGBT switch and bus capacitor DC-LINK.

[0005] These two boost strategies have many drawbacks in actual work, as follows:

[0006] 1. Using a large-capacity boost device to increase the voltage from 400V to 800V requires additional filter components, inductors, copper busbars, relays, etc., which will significantly increase weight and volume, and thus increase costs.

[0007] 2. The boost charging method using the motor winding can increase the voltage from 400V to 800V using the existing motor coil and the switching elements of the motor controller. However, the inductance of the motor winding is relatively small. During the boost charging, it is easy to cause large voltage ripple and current ripple at the input and output, resulting in large motor heating. In addition, the capacitors and power modules in the motor controller will heat up greatly, affecting the normal operation and service life of the motor and motor controller. Figure 4 The electrical architecture does not take into account the compatibility of 800V charging piles.

[0008] Therefore, further improvements are made to the above problems. Summary of the Invention

[0009] The main purpose of the present invention is to provide an all-in-one integrated boost device and its integration method, which adopts an integrated approach to make its structure compact and small in size, which will greatly save the space of the motor controller. The input capacitor Cin, bus capacitor C_dclink, EMC filter, boost inductor L1, switches S1, S2 and casing are integrated together, making the motor controller structure more compact and smaller in size, thereby saving costs.

[0010] Another object of the present invention is to provide an all-in-one integrated boost device and an integration method thereof, which adds a switch S2 directly connected to the battery pack, so that it can be compatible with an 800V high-voltage charging pile.

[0011] To achieve the above objectives, the present invention provides an all-in-one integrated boost device integration method, which performs integrated boosting through the all-in-one integrated boost device (integrated in a motor controller), comprising the following steps:

[0012] Step S1: When the external charging device is a low-voltage charging pile (preferably 400V), the charging mode switching device turns on the first switch S1, so that the low-voltage charging pile pre-charges the input capacitor Cin, and then connects to the center point of the motor winding through the boost inductor L1 and the first switch S1 in sequence. Then, the bus capacitor C_dclink is stored and filtered through the power module (IGBT), and then filtered through the EMC filter, thereby raising the low voltage input from the low-voltage charging pile to the high voltage required by the battery pack;

[0013] Step S2: When the external charging device is a high-voltage charging pile (preferably 800V), the charging mode switching device turns on the second switch S2, so that the high-voltage charging pile directly charges the battery pack with high voltage.

[0014] As a further preferred technical solution of the above technical solution, the input capacitor Cin, the bus capacitor C_dclink and the EMC filter are all placed around the placement groove of the shell, and the input capacitor Cin, the bus capacitor C_dclink and the EMC filter are surrounded to form a placement area, so that the first switch S1, the second switch S2 and the boost inductor L1 are placed in the placement area, and finally glue is poured and shaped.

[0015] As a further preferred technical solution of the above technical solution, the connections between the input capacitor Cin, the bus capacitor C_dclink, the EMC filter, the first switch S1, the second switch S2, the boost inductor L1, the charging pile and the battery pack are all connected through copper busbars and terminals, thereby organically combining the various components.

[0016] To achieve the above objectives, the present invention further provides an all-in-one integrated boost device, which is applied to the above-mentioned all-in-one integrated boost device integration method and is integrated into a motor controller, including a charging mode switching device, an input capacitor Cin, a boost inductor L1, a bus capacitor C_dclink, and an EMC filter, wherein:

[0017] When the external charging device is a low-voltage charging pile (preferably 400V), the charging mode switching device turns on the first switch S1, so that the low-voltage charging pile pre-charges the input capacitor Cin, and then connects it to the center point of the motor winding through the boost inductor L1 and the first switch S1. Then, the bus capacitor C_dclink is stored and filtered through the power module (IGBT), and then filtered through the EMC filter, thereby raising the low voltage input from the low-voltage charging pile to the high voltage required by the battery pack;

[0018] When the external charging device is a high-voltage charging pile (preferably 800V), the charging mode switching device turns on the second switch S2, so that the high-voltage charging pile directly charges the battery pack with high voltage.

[0019] As a further preferred technical solution of the above technical solution, the input capacitor Cin, the bus capacitor C_dclink and the EMC filter are all placed around the placement groove of the shell, and the input capacitor Cin, the bus capacitor C_dclink and the EMC filter are surrounded to form a placement area, so that the first switch S1, the second switch S2 and the boost inductor L1 are placed in the placement area, and finally glue is poured and shaped.

[0020] As a further preferred technical solution of the above technical solution, the connections between the input capacitor Cin, the bus capacitor C_dclink, the EMC filter, the first switch S1, the second switch S2, the boost inductor L1, the charging pile and the battery pack are all connected through copper busbars and terminals, thereby organically combining the various components.

[0021] The beneficial effects of the present invention are:

[0022] The present invention overcomes the large size and weight disadvantages of specialized boost charging devices, as well as the limitations of motor inductance in motor winding boost charging. The present invention organically integrates the input capacitor Cin, busbar capacitor C_dclink, EMC filter, boost inductor L1, relay switches S1 and S2, and housing, making the motor controller more compact and smaller. It also reduces installation and positioning, wiring layout, and the use of copper busbars. The use of aluminum housings for the capacitors and filters facilitates heat dissipation. Finally, the components are secured by glue, simplifying installation and positioning while increasing safety compliance. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a circuit diagram of the all-in-one integrated boost device and its integration method of the present invention.

[0024] Figure 2 It is a structural schematic diagram of the all-in-one integrated boosting device and its integration method of the present invention.

[0025] Figure 3 It is a structural schematic diagram of the all-in-one integrated boosting device and its integration method of the present invention.

[0026] Figure 4 This is a circuit diagram of a conventional booster device.

[0027] The reference numerals include: 10, outer shell; 11, first positive copper busbar; 12, first negative copper busbar; 13, second positive copper busbar; 14, second negative copper busbar; 15, third positive copper busbar; 16, third negative copper busbar; 17, connecting copper busbar; 18, fourth copper busbar; 19, fifth copper busbar; 21, first terminal; 22, second terminal; 23, third terminal; 24, fourth terminal; 25, fifth terminal; 26, sixth terminal; 27, seventh terminal; 28, eighth terminal; 29, ninth terminal; 30, tenth terminal; 31, eleventh terminal. DETAILED DESCRIPTION

[0028] The following description is intended to disclose the present invention so that those skilled in the art can implement the present invention. The preferred embodiments described below are for illustrative purposes only, and those skilled in the art will readily appreciate other obvious variations. The basic principles of the present invention defined in the following description may be applied to other embodiments, variations, improvements, equivalents, and other technical solutions that do not depart from the spirit and scope of the present invention.

[0029] In the preferred embodiments of the present invention, those skilled in the art should note that the charging pile, battery pack, etc. involved in the present invention can be regarded as prior art.

[0030] Preferred embodiment.

[0031] The present invention provides an all-in-one integrated boosting device integration method, which performs integrated boosting using the all-in-one integrated boosting device, comprising the following steps:

[0032] Step S1: When the external charging device is a low-voltage charging pile, the charging mode switching device turns on the first switch S1, so that the low-voltage charging pile pre-charges the input capacitor Cin, and then connects to the center point of the motor winding through the boost inductor L1 and the first switch S1. The bus capacitor C_dclink is then stored and filtered by the power module, and then filtered by the EMC filter, thereby raising the low voltage input from the low-voltage charging pile to the high voltage required by the battery pack.

[0033] Step S2: When the external charging device is a high-voltage charging pile, the charging mode switching device turns on the second switch S2, so that the high-voltage charging pile directly charges the battery pack with high voltage.

[0034] Specifically, the input capacitor Cin, the bus capacitor C_dclink and the EMC filter are all placed around the placement groove of the shell, and the input capacitor Cin, the bus capacitor C_dclink and the EMC filter are surrounded to form a placement area, so that the first switch S1, the second switch S2 and the boost inductor L1 are placed in the placement area, and finally glue is poured to finalize the shape.

[0035] More specifically, the connections between the input capacitor Cin, bus capacitor C_dclink, EMC filter, first switch S1, second switch S2, boost inductor L1, charging pile and battery pack are all connected through copper busbars and terminals, thereby organically combining the various components.

[0036] The present invention also discloses an all-in-one integrated boost device, which is applied to the above-mentioned all-in-one integrated boost device integration method and is integrated into a motor controller. The device includes a charging mode switching device, an input capacitor Cin, a boost inductor L1, a bus capacitor C_dclink, and an EMC filter, wherein:

[0037] When the external charging device is a low-voltage charging pile, the charging mode switching device turns on the first switch S1, so that the low-voltage charging pile pre-charges the input capacitor Cin, and then connects it to the center point of the motor winding through the boost inductor L1 and the first switch S1 in sequence. Then, the bus capacitor C_dclink is stored and filtered by the power module, and then filtered by the EMC filter, thereby raising the low voltage input from the low-voltage charging pile to the high voltage required by the battery pack;

[0038] When the external charging device is a high-voltage charging pile, the charging mode switching device turns on the second switch S2, so that the high-voltage charging pile directly charges the battery pack with high voltage.

[0039] Specifically, the input capacitor Cin, the bus capacitor C_dclink and the EMC filter are all placed around the placement groove of the shell, and the input capacitor Cin, the bus capacitor C_dclink and the EMC filter are surrounded to form a placement area, so that the first switch S1, the second switch S2 and the boost inductor L1 are placed in the placement area, and finally glue is poured to finalize the shape.

[0040] More specifically, the connections between the input capacitor Cin, bus capacitor C_dclink, EMC filter, first switch S1, second switch S2, boost inductor L1, charging pile and battery pack are all connected through copper busbars and terminals, thereby organically combining the various components.

[0041] It is worth mentioning that the charging mode switching device includes a switch S1 and a switch S2 (preferably a relay), one end of the switch S2 is connected to the first output end (positive pole) of the DC charging pile and the other end of the switch S2 is electrically connected to the positive pole of the battery pack through the EMC filter, one end of the switch S1 is electrically connected to the first output end of the DC charging pile through the boost inductor L1 and the other end of the switch S1 is electrically connected to the power module through the motor winding;

[0042] One end of the input capacitor Cin is electrically connected to the first output end of the DC charging pile, and the other end of the input capacitor Cin is electrically connected to the second output end (negative pole) of the DC charging pile, and the second output end of the DC charging pile is electrically connected to the negative pole of the battery pack;

[0043] The bus capacitor C_dclink is connected between the power module and the EMC filter, and the output end of the EMC filter is electrically connected to the battery pack.

[0044] Specifically, the input capacitor Cin includes a first positive copper busbar 11, a first negative copper busbar 12 and a first capacitor core, wherein the first positive copper busbar 11 is electrically connected to the first output end of the DC charging pile through the first terminal 21 and the first negative copper busbar 12 is electrically connected to the second output end of the DC charging pile through the second terminal 22.

[0045] More specifically, the bus capacitor C_dclink includes a second positive copper bar 13, a second negative copper bar 14 and a second capacitor core, the second positive copper bar 13 is electrically connected to the third positive copper bar 15 of the EMC filter, and the second negative copper bar 14 is electrically connected to the third negative copper bar 16 of the EMC filter.

[0046] Furthermore, the EMC filter includes a primary filter unit and a secondary filter unit, the input end of the primary filter unit is electrically connected to the bus capacitor C_dclink and the output end of the primary filter unit is electrically connected to the input end of the secondary filter unit, and the output end of the secondary filter unit is electrically connected to the battery pack (high voltage, Battery), wherein:

[0047] The primary filter unit includes capacitor C1, capacitor C2, capacitor C3 and filter inductor L2, and the secondary filter unit includes capacitor C4, capacitor C5, capacitor C6 and filter inductor L3 (secondary filtering, capacitors C1, C2, C4 and C5 are Y capacitors, capacitors C3 and C6 are X capacitors, and the capacitors and filter inductor are located between the third positive copper busbar and the third negative copper busbar).

[0048] Furthermore, the third positive copper busbar 15 of the EMC filter is connected to the positive electrode of the battery pack through the eleventh terminal 31 and the third negative copper busbar 16 of the EMC filter is connected to the negative electrode of the battery pack through the tenth terminal 30 .

[0049] Preferably, the input capacitor Cin is further electrically connected to an end of the boost inductor L1 away from the switch S1 via a sixth terminal 26 of the connecting copper bar 17 (the first negative copper bar, the second negative copper bar, and the third negative copper bar are integrated into one copper bar, the first positive copper bar and the connecting copper bar are integrated into one copper bar, and the second positive copper bar and the third positive copper bar are integrated into one copper bar). An end of the boost inductor L1 close to the switch S1 is electrically connected to an eighth terminal 28 of the fourth copper bar 18, and a ninth terminal 29 of the fourth copper bar 18 is electrically connected to an end of the switch S1 close to the boost inductor L1.

[0050] One end of the switch S1 away from the boost inductor L1 is electrically connected to the third terminal 23 of the fifth copper bar 19 and the fourth terminal 24 of the fifth copper bar 19 is connected to the center point of the resistor winding;

[0051] The input capacitor Cin is electrically connected to one end of the switch S2 via the fifth terminal 25 of the connecting copper bus 17 , and the end of the switch S2 away from the input capacitor Cin is electrically connected to the positive electrode of the battery pack via the seventh terminal 27 of the second positive copper bus 13 .

[0052] Preferably, it also includes a shell 10, which is provided with a placement groove, and the input capacitor Cin, the bus capacitor C_dclink and the EMC filter are all placed in the placement groove, and the boost inductor L1, the switch S1 and the switch S2 are all integrated in the placement area formed by the input capacitor Cin, the bus capacitor C_dclink and the EMC filter.

[0053] Preferably, the principles of the present invention are:

[0054] like Figure 1As shown in the figure, when the external charging device is a 400V DC charging station, relay switch S1 is closed, and the low-voltage power supply first pre-charges the input capacitor Cin. This is then connected to the center point of the motor winding through the boost inductor L1 and relay switch S1. Next, through the switching of the power module IGBT, energy storage and filtering by the bus capacitor C_dclink, and filtering by the EMC filter, the low-voltage power is finally boosted to the high-voltage power required by the battery pack. When the external charging device is an 800V DC charging station, relay switch S2 is closed, and the external power supply directly charges the high-voltage battery pack.

[0055] like Figure 2 and Figure 3 As shown, the input capacitor Cin can be used for energy storage and filtering during boost and buck operation. The bus capacitor C_dclink can be used for energy storage and filtering during normal operation of the motor controller. The first positive copper bar is the positive copper bar of the input capacitor Cin, and the first negative copper bar is the negative copper bar of the input capacitor Cin. The first capacitor core is located between the first positive copper bar and the first negative copper bar, and together they form the input capacitor Cin. The second positive copper bar is the positive copper bar of the bus capacitor C_dclink, and the second negative copper bar is the negative copper bar of the bus capacitor C_dclink. The second capacitor core is located between the second positive copper bar and the second negative copper bar, and together they form the bus capacitor C_dclink. The input capacitor Cin and the bus capacitor C_dclink use a common negative copper bar. The positive input terminal of capacitor Cin is connected to the positive terminal of the DC charging pile, and the negative input terminal of capacitor Cin is connected to the negative terminal of the DC charging pile.

[0056] In order to improve the anti-interference capability, an EMC filter needs to be provided at the high-voltage power supply end. The general practice in motor controllers is to use the EMC filter as a separate device, which increases the size of the controller. The present invention integrates the EMC filter into the busbar capacitor C_dclink and the housing. The filter is a two-stage filter, including: Y capacitors C1, C2, X capacitors C3, filter inductor L2, Y capacitors C4, C5, X capacitors C6, and filter inductor L3. The second positive copper bar of the busbar capacitor C_dclink is connected to the third positive copper bar of the filter EMC, and the second negative copper bar of the busbar capacitor C_dclink is connected to the third negative copper bar of the filter. The X capacitor, Y capacitor, and filter inductor in the filter are arranged between the third negative copper bar and the third positive copper bar of the copper bar. The positive output terminal of the EMC filter is connected to the positive pole of the high-voltage battery pack, and the negative output terminal of the EMC filter is connected to the negative pole of the high-voltage battery pack. By integrating the EMC filter at the high-voltage output end of the bus capacitor C_dclink, the EMC capability of the motor controller can be improved. At the same time, the layout of components and line connections can be simplified, making the motor controller more compact, smaller and less expensive.

[0057] In order to reduce the input and output voltage ripple and current ripple during boosting, it is necessary to add an additional boost inductor L1. At the same time, in order to be compatible with 800V charging piles, it is necessary to add a relay switch S2 so that the 800V high-voltage direct current can directly charge the high-voltage battery pack. The present invention integrates the boost inductor L1, relays S1 and S2 in the area formed by the input capacitor Cin, the bus capacitor C_dclink and the EMC filter. The input capacitor Cin is connected to one end of the boost inductor L1 through the sixth terminal of the connecting copper bar, and the other end of the boost inductor L1 is connected to the eighth terminal of the fourth copper bar. Then, the ninth terminal of the fourth copper bar is connected to one end of the relay switch S1. Then, the other end of the relay switch S1 is connected to the third terminal of the fifth copper bar. The fourth terminal output of the fifth copper bar is connected to the center point of the external motor winding. The input capacitor Cin is connected to one end of the relay switch S2 through the fifth terminal of the connecting copper bar. The other end of the relay switch S2 is connected to the high-voltage positive electrode through the seventh terminal of the second positive copper bar. This fully utilizes the space between the positive and negative copper busbars of the two capacitors, improving space utilization and making the overall structure of the motor controller more compact. The positive copper busbar of the input capacitor Cin can also be used to secure the boost inductor L1, while the positive copper busbar of the busbar capacitor C_dclink can be used to secure the relay switch S2. This reduces the number of fixtures or brackets required and thus reduces the overall structural volume. Simultaneously, the positive copper busbar of the input capacitor Cin is used to power the boost inductor L1, and the other end of the boost inductor L1 is connected to the relay switch S1. The positive copper busbar of the input capacitor Cin and the positive copper busbar of the busbar capacitor C_dclink directly connect the relay switch S2, reducing wiring layout and copper busbar usage, effectively reducing the parasitic inductance of the copper busbar.

[0058] The input capacitor Cin, busbar capacitor C_dclink, and filter are first integrated into the housing to form a concave space. The boost inductor L1, relays S1, and S2 are then integrated into this concave space. The entire device is then potted with glue. This not only makes the controller more compact and improves space utilization, but the aluminum housing also facilitates heat dissipation from the capacitors and filter. Furthermore, potting with glue not only reduces component installation, but also increases safety compliance and resolves heat dissipation issues with the capacitor busbars.

[0059] It is worth mentioning that the technical features such as charging piles and battery packs involved in the patent application of this invention should be regarded as prior art. The specific structure, working principle and possible control method and spatial layout method of these technical features can be selected by conventional options in the field, and should not be regarded as the inventive point of this patent. This patent will not be further elaborated.

[0060] For those skilled in the art, it is still possible to modify the technical solutions described in the aforementioned embodiments, or to make equivalent replacements for some of the technical features therein. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for integrating an all-in-one integrated boosting device, wherein the integrated boosting is performed by using the all-in-one integrated boosting device, characterized in that: The following steps are involved: Step S1: When the external charging device is a low-voltage charging pile, the charging mode switching device turns on the first switch S1, so that the low-voltage charging pile pre-charges the input capacitor Cin, and then connects to the center point of the motor winding through the boost inductor L1 and the first switch S1. The bus capacitor C_dclink is then stored and filtered by the power module, and then filtered by the EMC filter, thereby raising the low voltage input from the low-voltage charging pile to the high voltage required by the battery pack. Step S2: When the external charging device is a high-voltage charging pile, the charging mode switching device turns on the second switch S2, so that the high-voltage charging pile directly charges the battery pack with high voltage; The input capacitor Cin, busbar capacitor C_dclink, and EMC filter are all placed around the placement groove of the housing. The input capacitor Cin, busbar capacitor C_dclink, and EMC filter surround the placement area, allowing the first switch S1, second switch S2, and boost inductor L1 to be placed in the placement area. Finally, glue is poured to finalize the shape. The input capacitor Cin, busbar capacitor C_dclink, EMC filter, first switch S1, second switch S2, boost inductor L1, charging pile, and battery pack are all connected through copper busbars and terminals, thus organically combining various components. The EMC filter includes a primary filter unit and a secondary filter unit, wherein the input end of the primary filter unit is electrically connected to the bus capacitor C_dclink and the output end of the primary filter unit is electrically connected to the input end of the secondary filter unit, and the output end of the secondary filter unit is electrically connected to the battery pack, wherein: The primary filter unit includes capacitors C1, C2, C3 and filter inductor L2, and the secondary filter unit includes capacitors C4, C5, C6 and filter inductor L3; The third positive copper busbar of the EMC filter is connected to the positive electrode of the battery pack via the eleventh terminal, and the third negative copper busbar of the EMC filter is connected to the negative electrode of the battery pack via the tenth terminal. By integrating the EMC filter at the high-voltage output end of the bus capacitor C_dclink, EMC capabilities can be improved while simplifying the layout of components and line connections. The boost inductor L1, the first switch S1, and the second switch S2 are integrated into the placement area formed by the input capacitor Cin, the bus capacitor C_dclink, and the EMC filter. The input capacitor Cin is connected to one end of the boost inductor L1 via the sixth terminal of the connecting copper bar, and the other end of the boost inductor L1 is connected to the eighth terminal of the fourth copper bar. Then, the ninth terminal of the fourth copper bar is connected to one end of the first switch S1, and the other end of the first switch S1 is connected to the third terminal of the fifth copper bar. The fourth terminal of the fifth copper bar is output and connected to the center point of the external motor winding. The input capacitor Cin is connected to one end of the second switch S2 via the fifth terminal of the connecting copper bar, and the other end of the second switch S2 is connected to the seventh terminal of the second positive copper bar. The terminal is connected to the high-voltage positive electrode, which fully utilizes the space between the positive and negative copper bars of the two capacitors, improves space utilization, and makes the overall structure more compact. The positive copper bar of the input capacitor Cin is used to fix the boost inductor L1, and the positive copper bar of the bus capacitor C_dclink is used to fix the second switch S2, thereby reducing the number of fixings or brackets and thus reducing the overall structure volume. At the same time, the positive copper bar of the input capacitor Cin is used to power the boost inductor L1, and the other end of the boost inductor L1 is connected to the relay switch S1. The positive copper bar of the input capacitor Cin and the positive copper bar of the bus capacitor C_dclink are used to directly connect the second switch S2, reducing the layout of wiring and the use of copper bars, and effectively reducing the parasitic inductance of the copper bars.

2. An all-in-one integrated boosting device, characterized in that: The all-in-one integrated boost device integration method according to claim 1 is integrated into a motor controller and includes a charging mode switching device, an input capacitor Cin, a boost inductor L1, a bus capacitor C_dclink, and an EMC filter, wherein: When the external charging device is a low-voltage charging pile, the charging mode switching device turns on the first switch S1, so that the low-voltage charging pile pre-charges the input capacitor Cin, and then connects it to the center point of the motor winding through the boost inductor L1 and the first switch S1 in sequence. Then, the bus capacitor C_dclink is stored and filtered by the power module, and then filtered by the EMC filter, thereby raising the low voltage input from the low-voltage charging pile to the high voltage required by the battery pack; When the external charging device is a high-voltage charging pile, the charging mode switching device turns on the second switch S2, so that the high-voltage charging pile directly charges the battery pack with high voltage; The input capacitor Cin, bus capacitor C_dclink, and EMC filter are all placed around the placement groove of the housing. The input capacitor Cin, bus capacitor C_dclink, and EMC filter form a placement area, and then the first switch S1, second switch S2, and boost inductor L1 are placed in the placement area. Finally, glue is poured to finalize the shape. The input capacitor Cin, bus capacitor C_dclink, EMC filter, first switch S1, second switch S2, boost inductor L1, charging pile and battery pack are all connected through copper busbars and terminals, thus organically combining the various components.

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