Charging circuit and vehicle

Abstract

The invention provides a charging circuit and a vehicle. The charging circuit comprises a first charging port and a battery pack group, the battery pack group comprises a first battery pack and a second battery pack, and the first battery pack and the second battery pack have a series connection state and a parallel connection state; in the series connection state, the first charging port is connected with the first battery pack and the second battery pack in series; in the parallel connection state, the first battery pack and the second battery pack are connected in parallel, and the first charging port is connected with the first battery pack or the second battery pack in series. According to the invention, the battery pack can be quickly charged in various charging scenes, and the flexibility and efficiency of vehicle charging are greatly improved.

Description

Technical Field

[0001] The present application relates to the technical field of vehicle charging, and in particular to a charging circuit and a vehicle. Background Art

[0002] With the development of technology, users are paying more and more attention to the charging speed and driving range of electric vehicles. At present, the charging system that uses a high-voltage battery pack of more than 500V and a dual-charger charging system is an effective solution to improve the charging speed and driving range of electric vehicles. However, most of the current solutions are only suitable for scenarios such as dual high-voltage charging piles and are not flexible enough. Summary of the invention

[0003] In view of this, the present application provides a charging circuit and a vehicle, which can quickly charge the battery pack in a variety of charging scenarios, greatly improving the flexibility and efficiency of vehicle charging.

[0004] In a first aspect, an embodiment of the present application provides a charging circuit, which includes a first charging port and a battery pack group; the battery pack group includes a first battery pack and a second battery pack, and the first battery pack and the second battery pack include a series state and a parallel state; in the series state, the first charging port is connected in series with the first battery pack and the second battery pack; in the parallel state, the first battery pack and the second battery pack are connected in parallel, and the first charging port is connected in series with the first battery pack or the second battery pack.

[0005] In a second aspect, an embodiment of the present application provides a vehicle, comprising a charging circuit as described in the first aspect of the embodiment of the present application.

[0006] It can be seen that through the above charging circuit and vehicle, the charging circuit includes a first charging port and a battery pack group; the battery pack group includes a first battery pack and a second battery pack, and the first battery pack and the second battery pack include a series state and a parallel state; in the series state, the first charging port is connected in series with the first battery pack and the second battery pack; in the parallel state, the first battery pack and the second battery pack are connected in parallel, and the first charging port is connected in series with the first battery pack or the second battery pack. The battery pack can be quickly charged in a variety of charging scenarios, which greatly improves the flexibility and efficiency of charging the vehicle. BRIEF DESCRIPTION OF THE DRAWINGS

[0007] In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the accompanying drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are some embodiments of the present invention. For ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without paying any creative work.

[0008] Figure 1 A schematic diagram of a charging circuit provided in an embodiment of the present application;

[0009] Figure 2 A schematic diagram of the structure of another charging circuit provided in an embodiment of the present application;

[0010] Figure 3 A schematic diagram of a charging circuit provided in another embodiment of the present application;

[0011] Figure 4 A schematic diagram of the structure of another charging circuit provided in an embodiment of the present application;

[0012] Figure 5 A structural schematic diagram of another charging circuit provided in an embodiment of the present application;

[0013] Figure 6 A schematic diagram of the structure of another charging circuit provided in an embodiment of the present application. DETAILED DESCRIPTION

[0014] In order to enable those skilled in the art to better understand the solution of the present application, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0015] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions. For example, a process, method, system, product or device that includes a series of steps or units is not limited to the listed steps or units, but optionally includes steps or units that are not listed, or optionally includes other steps or units inherent to these processes, methods, products or devices.

[0016] It should be understood that the term "and / or" in this article is only a description of the association relationship of associated objects, indicating that there can be three relationships. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / " in this article indicates that the associated objects before and after are in an "or" relationship. The "plurality" appearing in the embodiments of the present application refers to two or more.

[0017] In the embodiments of the present application, "at least one item" or similar expressions refer to any combination of these items, including any combination of single items or plural items, and refer to one or more, and multiple refers to two or more. For example, at least one item of a, b, or c can represent the following seven situations: a, b, c, a and b, a and c, b and c, a, b, and c. Among them, each of a, b, and c can be an element or a set containing one or more elements.

[0018] The "connection" that appears in the embodiments of the present application refers to various connection methods such as direct connection or indirect connection to achieve communication between devices, and the embodiments of the present application do not impose any limitations on this.

[0019] Reference to "embodiments" herein means that a particular feature, structure, or characteristic described in conjunction with the embodiments may be included in at least one embodiment of the present application. The appearance of the phrase in various locations in the specification does not necessarily refer to the same embodiment, nor is it an independent or alternative embodiment that is mutually exclusive with other embodiments. It is explicitly and implicitly understood by those skilled in the art that the embodiments described herein may be combined with other embodiments.

[0020] The following is an explanation of the relevant contents, concepts, meanings, technical issues, technical solutions, beneficial effects, etc. involved in the embodiments of the present application.

[0021] Figure 1 A schematic diagram of a charging circuit provided in an embodiment of the present application includes a first charging port 150 and a battery pack 130, wherein the battery pack 130 includes a first battery pack 131 and a second battery pack 132, wherein the first battery pack 131 and the second battery pack 132 include a series connection state and a parallel connection state;

[0022] In the series connection state, the first charging port 150 is connected in series with the first battery pack 131 and the second battery pack 132 ;

[0023] In the parallel state, the first battery pack 131 and the second battery pack 132 are connected in parallel, and the first charging port 150 is connected in series with the first battery pack 131 or the second battery pack 132 .

[0024] Among them, in the series state, the first charging port 150 charges the first battery pack 131 and the second battery pack 132 at the same time. The series state can be triggered when the voltage of the first charging port 150 is greater than or equal to the charging voltage of the battery pack group 130. For example, the voltage of the charging pile connected to the first charging port 150 is 800V, and the charging voltage of the battery pack group 130 is 500V. At this time, the series state is triggered, and the first charging port 150 performs high-voltage charging for the first battery pack 131 and the second battery pack 132, which greatly improves the charging efficiency.

[0025] Among them, when the voltage of the first charging port 150 is lower than the charging voltage of the battery pack group 130, the first battery pack 131 and the second battery pack 132 are in a parallel state. For example, the voltage of the charging pile connected to the first charging port 150 is 300V, and the charging voltage of the battery pack group 130 is 500V. At this time, the parallel state is triggered, and the first charging port 150 charges the first battery pack 131 and the second battery pack 132 in parallel, thereby charging the battery pack group 130, and will not cause the battery pack group 130 to be unable to be charged or to charge slowly.

[0026] For ease of understanding, the structure of the above charging circuit is further explained below. Figure 2 , wherein the first charging port 150 includes a first pole (positive pole) and a second pole (negative pole), one end of the first battery pack 131 is connected to the first pole of the first charging port 150, the other end of the first battery pack 131 is connected to one end of the second battery pack 132, and the other end of the second battery pack 132 is connected to the second pole of the first charging port 150.

[0027] The charging circuit further includes a switch module, which is connected to the first battery pack 131 and the second battery pack 132 and is used to switch the first battery pack 131 and the second battery pack 132 between the series state and the parallel state.

[0028] Specifically, the switch module includes a first switch component switch k1, one end of the switch k1 is connected to the first battery pack 131, and the other end of the switch k1 is connected to the second battery pack 132. When the switch k1 is turned on, the first battery pack 131 and the second battery pack 132 are in the series state, and when the switch k1 is turned off, the first battery pack 131 and the second battery pack 132 are in the parallel state.

[0029] In order to achieve the switching between the above-mentioned series state and parallel state, the switch module also includes a second switch component, one end of the second switch component is connected to the first pole, a first connection point and a second connection point are provided between the first battery pack 131 and the second battery pack 132, one of the first connection point and the second connection point is used to connect one end of the second switch component, and the other of the first connection point and the second connection point is used to connect to the second pole of the first charging port 150, one end of the first battery pack 131 is connected to the first pole of the first charging port 150, and the other end is connected to the first connection point, one end of the second battery pack 132 is connected to the second connection point, and the other end is connected to the second pole of the first charging port 150.

[0030] Furthermore, the second switch component includes at least one of a switch and a buck-boost module.

[0031] Specifically, the second switch component is switch k7, one end of the switch k7 is electrically connected to the first pole of the first charging port 150, and the other end of the switch k7 is one end of the second switch component, switch k10, one end of the switch k10 is connected to the first connection point, and the other end of the switch k10 is connected to the second pole of the first charging port 150.

[0032] Specifically, the second switch component also includes a buck-boost module 120, one end of the buck-boost module 120 is respectively connected to the first pole of the first charging port 150 and the positive pole of the first battery pack 131, and the other end of the buck-boost module 120 is connected to the other end of the switch k7.

[0033] When the series connection state is triggered, switch k1 is closed, switch k7 is opened, and switch k10 is opened. The current from the first charging port 150 starts from the first pole of the first charging port 150, passes through the first battery pack 131, switch k1, and the second battery pack 132 in sequence and returns to the second pole of the first charging port 150, completing the high-voltage charging of the entire battery pack 130, greatly improving the charging efficiency.

[0034] When the parallel state is triggered, switch k1 is opened, switch k7 is closed, and switch k10 is closed. The current for charging the first battery pack 131 starts from the first pole of the first charging port 150, passes through the first battery pack 131 and switch k10 in sequence, and returns to the second pole of the first charging port 150, thereby completing the charging of the first battery pack 131. At the same time, the current for charging the second battery pack 132 starts from the first pole of the first charging port 150, passes through the buck-boost module 120, switch k7, the second battery pack 132 in sequence, and returns to the second pole of the first charging port 150, thereby completing the charging of the second battery pack 132. It can be seen that by charging the first battery pack 131 and the second battery pack 132 in parallel, the battery pack group 130 can be charged even when there is only a low voltage charging current, thereby improving the charging efficiency.

[0035] Specifically, the buck-boost module 120 is a motor assembly, which includes a motor winding and an inverter, one end of the motor winding is connected to the first pole of the second charging port, the other end of the motor winding is connected to the midpoint of the bridge arm of the inverter, and the two ends of the inverter are connected to the two ends of the first battery pack 131 and the second battery pack 132. The inverter is configured to control the motor winding to boost the voltage input from the second charging port 140 to charge the first battery pack 131 and the second battery pack 132.

[0036] See also Figure 3 The buck-boost module 120 includes an inductor L, a switch tube VT1, a diode VD1, a switch tube VT2, and a diode VD2. It can be understood that the switch tube VT1 and the diode VD1 constitute a first inverter module, the switch tube VT2 and the diode VD2 constitute a second inverter module, and the inductor is connected to the midpoint of the first inverter module and the second inverter module.

[0037] When the parallel state is triggered, the switch tube VT1 is turned on, the switch k1 is turned off, the switch k7 is closed, and the switch k10 is closed. The current for charging the first battery pack 131 starts from the first pole of the first charging port 150, passes through the first battery pack 131 and the switch k10 in sequence, and returns to the second pole of the first charging port 150, thereby completing the charging of the first battery pack 131. At the same time, the current for charging the second battery pack 132 starts from the first pole of the first charging port 150, passes through the switch tube VT1, the inductor L, the switch k7, the second battery pack 132 in sequence, and returns to the second pole of the first charging port 150, thereby completing the charging of the second battery pack 132. It can be seen that by charging the first battery pack 131 and the second battery pack 132 in parallel, the battery pack group 130 can be charged even when there is only a low voltage charging current, thereby improving the charging efficiency.

[0038] It should be noted that the buck-boost module 120 may also include multiple buck-boost inverters, each buck-boost inverter has an inductor and an inverter bridge, each inverter bridge has a first inverter module and a second inverter module, each inverter bridge is connected in parallel to each other, and each inductor is connected in parallel to each other. The buck-boost inverter here is for illustrative purposes only and does not represent a limitation on the embodiments of the present application.

[0039] Through the above charging circuit, the battery packs can be charged in parallel at a single-gun low voltage to achieve the same effect as charging the whole pack, greatly improving the charging efficiency.

[0040] Combine the following Figure 4 Another charging circuit in the embodiment of the present application is described. Figure 4 A schematic diagram of a charging circuit according to another embodiment of the present application includes a control module 110, a buck-boost module 120, a battery pack 130, a second charging port 140, and a first charging port 150. The battery pack 130 includes a first battery pack 131 and a second battery pack 132. A switch k1 is provided between the first battery pack 131 and the second battery pack 132.

[0041] The buck-boost module 120 is used to boost or buck the voltage input from the second charging port 140 to charge the battery pack 130. The buck-boost module 120 may be a motor assembly, which includes a motor winding and an inverter, one end of the motor winding is connected to the first pole of the second charging port, the other end of the motor winding is connected to the midpoint of the bridge arm of the inverter, and the two ends of the inverter are connected to the two ends of the first battery pack 131 and the second battery pack 132. The inverter is configured to control the motor winding to boost the voltage input from the second charging port 140 to charge the first battery pack 131 and the second battery pack 132.

[0042] The first pole of the second charging port 140 is respectively connected to the first pole of the second battery pack 132, one end of the switch k1 and the first port 121 of the buck-boost module 120, the second pole of the second charging port 140 is connected to the second port 122 of the buck-boost module 120, the third port 123 of the buck-boost module 120 is respectively connected to the first pole of the first charging port 150 and the first pole of the first battery pack 131, the fourth port 124 of the buck-boost module 120 is respectively connected to the second pole of the first charging port 150 and the second pole of the second battery pack 132, and the second pole of the first charging port 150 is also connected to the second pole of the first battery pack 131 and the other end of the switch k1.

[0043] Among them, the control module 110 is electrically connected to the second charging port 140, the first charging port 150, the battery pack group 130 and the buck-boost module 120 respectively, and the control module 110 is used to control the charging circuit to charge the first battery pack 131 and / or the second battery pack 132 according to the output voltage of the second charging pile connected to the second charging port 140 and / or the output voltage of the first charging pile connected to the first charging port 150.

[0044] In a possible embodiment, if the second charging port 140 is connected to the second charging pile, the first charging port 150 is connected to the first charging pile, and the output voltage of the second charging pile and / or the output voltage of the first charging pile is less than a preset voltage value, the control module 110 is used to control the first current of the second charging pile to flow through the first pole of the second charging port 140, the first pole of the second battery pack 132, the second pole of the second battery pack 132, the fourth port 124 of the buck-boost module 120, the second port 122 of the buck-boost module 120, and the second pole of the second charging port 140 in sequence to charge the second battery pack 132, and the control module 110 is used to control the second current of the first charging pile to flow through the first pole of the first charging port 150, the first pole of the first battery pack 131, the second pole of the first battery pack 131, and the second pole of the first charging port 150 in sequence to charge the first battery pack 131. In this way, the battery can be fully charged when the high-voltage charging pile is not used simultaneously for dual-gun charging, thereby improving the battery charging efficiency.

[0045] It should be noted that the preset voltage value can be determined according to the battery pack voltage. For example, when the output voltage of the charging pile is greater than or equal to the battery pack voltage, the charging pile can be considered as a high-voltage charging pile. When the output voltage of the charging pile is less than the battery pack voltage, the charging pile can be considered as a low-voltage charging pile. The preset voltage value will not be described in detail later.

[0046] In a possible embodiment, if the second charging port 140 is connected to the second charging pile and the output voltage of the second charging pile is greater than or equal to the preset voltage value, the control module 110 is used to control the first current to flow through the first pole of the second charging port 140, the first port 121 of the buck-boost module 120, the third port 123 of the buck-boost module 120, the first pole of the first battery pack 131, the second pole of the first battery pack 131, the switch k1, the first pole of the second battery pack 132, the second pole of the second battery pack 132, the fourth port 124 of the buck-boost module 120, the second port 122 of the buck-boost module 120, and the second pole of the second charging port 140 to charge the first battery pack 131 and the second battery pack 132. In this way, when a high-voltage charging pile is used to connect the second charging port for single-gun charging, the battery can be fully charged to improve the battery charging efficiency.

[0047] In a possible embodiment, if the first charging port 150 is connected to the first charging pile and the output voltage of the first charging pile is greater than or equal to the preset voltage value, the control module 110 is used to control the second current to flow through the first pole of the first charging port 150, the first pole of the first battery pack 131, the second pole of the first battery pack 131, the switch k1, the first pole of the second battery pack 132, the second pole of the second battery pack 132, and the second pole of the first charging port 150 in sequence to charge the first battery pack and the second battery pack. In this way, when a high-voltage charging pile is connected to the first charging port for single-gun charging, the battery can be fully charged to improve the battery charging efficiency.

[0048] In a possible embodiment, if the second charging port 140 is connected to the second charging pile and the output voltage of the second charging pile is less than the preset voltage value, the control module 110 is used to control the first current to flow from the first pole of the second charging port 140 to the buck-boost module 120 through the first port 121 of the buck-boost module 120 to boost the voltage and obtain the first boost current, and then make the first boost current flow through the third port 123 of the buck-boost module 120, the first pole of the first battery pack 131, the second pole of the first battery pack 131, the switch k1, the first pole of the second battery pack 132, the second pole of the second battery pack 132, the fourth port 124 of the buck-boost module 120, the second port 122 of the buck-boost module 120, and the second pole of the second charging port 140 to charge the first battery pack 131 and the second battery pack 132. In this way, when a low-voltage charging pile is used to connect the second charging port for single-gun charging, the battery can be fully charged to improve the battery charging efficiency.

[0049] For ease of understanding, the buck-boost module in the embodiment of the present application is first described. The buck-boost module 120 may include a first capacitor, a second capacitor, and at least one buck-boost inverter, each of which includes an inverter bridge and an inductor;

[0050] One end of the inductor of each buck-boost inverter is connected to the midpoint of the inverter bridge of the buck-boost inverter, and the other end of the inductor of each buck-boost inverter is the first port of the buck-boost module. Each inverter bridge includes a first inverter module and a second inverter module. One end of each first inverter module is the third port of the buck-boost module, and one end of each second inverter module is the fourth port of the buck-boost module. The other end of each first inverter module is connected to the other end of the corresponding second inverter module. The first capacitor is arranged between the third port of the buck-boost module and the fourth port of the buck-boost module, and the second capacitor is arranged between the first port of the buck-boost module and the second port of the buck-boost module.

[0051] For details, see Figure 5 , Figure 5 A structural schematic diagram of another charging circuit provided in an embodiment of the present application, the buck-boost module 120 includes a first capacitor C1, a second capacitor C2, an inductor L, a switch tube VT1, a diode VD1, a switch tube VT2, and a diode VD2. It can be understood that the switch tube VT1 and the diode VD1 constitute a first inverter module, the switch tube VT2 and the diode VD2 constitute a second inverter module, the inductor is connected to the midpoint of the first inverter module and the second inverter module, one end of the first capacitor C1 is connected to the third port 123 of the buck-boost module 120, the other end of the first capacitor C1 is connected to the fourth port 124 of the buck-boost module 120, and one end of the second capacitor C2 is connected to the inductor L, that is, the first port 121 of the buck-boost module 120, and the other end of the second capacitor C2 is connected to the second port 122 of the buck-boost module 120. The control module (not shown) may first control the switch tube VT2 to be turned on and the switch tube VT1 to be turned off so as to charge the inductor L, and then control the switch tube VT2 to be turned off and the switch tube VT1 to be turned on so as to discharge the inductor L, that is, the first current is boosted to obtain the first boosted current, and then flows through the third port 123 of the buck-boost module 120, the first pole of the first battery pack 131, the second pole of the first battery pack 131, the switch k1, the first pole of the second battery pack 132, the second pole of the second battery pack 132, the fourth port 124 of the buck-boost module 120, the second port 122 of the buck-boost module 120, and the second pole of the second charging port 140 in sequence to charge the first battery pack 131 and the second battery pack 132. No further details are given here.

[0052] It should be noted that the buck-boost module 120 may also include multiple buck-boost inverters, each buck-boost inverter has an inductor and an inverter bridge, each inverter bridge has a first inverter module and a second inverter module, each inverter bridge is connected in parallel to each other, and each inductor is connected in parallel to each other. The buck-boost inverter here is for illustrative purposes only and does not represent a limitation on the embodiments of the present application.

[0053] In a possible embodiment, if the first charging port 150 is connected to the first charging pile and the output voltage of the first charging pile is less than the preset voltage value, the control module 110 is used to control the second current to flow through the first parallel circuit to charge the first battery pack, and the control module 110 is used to control the second current to flow through the second parallel circuit to charge the second battery pack;

[0054] The first parallel circuit includes a first pole of the first charging port 150 , a first pole of the first battery pack 131 , a second pole of the first battery pack 131 , and a second pole of the first charging port 150 ;

[0055] The second parallel circuit includes the first pole of the first charging port 150, the third port 123 of the buck-boost module 120, the first port 121 of the buck-boost module 120, the first pole of the second battery pack 132, the second pole of the second battery pack 132, and the second pole of the first charging port 150. In this way, when a low-voltage charging pile is connected to the first charging port for single-gun charging, the battery can be fully charged in parallel to improve the battery charging efficiency.

[0056] In a possible embodiment, if the second charging port 140 is connected to the second charging pile, the first charging port 150 is connected to the first charging pile, and the output voltage of the second charging pile and / or the output voltage of the first charging pile is greater than or equal to the preset voltage value,

[0057] The control module 110 is used to control the first current to flow sequentially through the first pole of the second charging port 140, the first port 121 of the buck-boost module 120, the third port 123 of the buck-boost module 120, the first pole of the first battery pack 131, the second pole of the first battery pack 131, the switch k1, the first pole of the second battery pack 132, the second pole of the second battery pack 132, the fourth port 124 of the buck-boost module 120, the second port 122 of the buck-boost module 120, and the second pole of the second charging port 140 to charge the first battery pack 131 and the second battery pack 132.

[0058] The control module 110 is used to control the second current to flow sequentially through the first pole of the first charging port 150, the first pole of the first battery pack 131, the second pole of the first battery pack 131, the switch k1, the first pole of the second battery pack 132, the second pole of the second battery pack 132, and the second pole of the first charging port 150 to charge the first battery pack 131 and the second battery pack 132. In this way, the battery can be fully charged when the high-voltage charging pile is used for dual-gun charging at the same time, thereby improving the battery charging efficiency.

[0059] In a possible embodiment, if the second charging port 140 is connected to the second charging pile, and the power of the second battery pack 132 is greater than or equal to a preset power value, and the power of the first battery pack 131 is less than the preset power value, then the control module 110 is used to control the first current to flow through the first pole of the second charging port 140, the first port 121 of the buck-boost module 120, the third port 123 of the buck-boost module 120, the first pole of the first battery pack 131, the second pole of the first battery pack 131, the fourth port 124 of the buck-boost module 120, the second port 122 of the buck-boost module 120, and the second pole of the second charging port 140 in sequence to charge the first battery pack 131.

[0060] Among them, the preset power value can be a full power or a higher power. At this time, there is an obvious capacity imbalance between the first battery pack and the second battery pack. For example, the second battery pack is full but the first battery pack is not yet full. It can be controlled to only charge the first battery pack to achieve capacity balance.

[0061] In a possible embodiment, if the second charging port 140 is connected to the second charging pile, and the power of the second battery pack 132 is less than a preset power value, and the power of the first battery pack 131 is greater than or equal to the preset power value, the control module 110 is used to control the first current to flow through the first pole of the second charging port 140, the first pole of the second battery pack 132, the second pole of the second battery pack 132, the fourth port 124 of the buck-boost module 120, the second port 122 of the buck-boost module 120, and the second pole of the second charging port 140 in sequence to charge the second battery pack. In this way, when the second charging port is charged with a single gun and the first battery pack is fully charged but the second battery pack is not fully charged, only the second battery pack is charged to achieve capacity balancing.

[0062] In a possible embodiment, if the first charging port 150 is connected to the first charging pile, and the power of the second battery pack 132 is greater than or equal to the preset power value, and the power of the first battery pack 131 is less than the preset power value, the control module 110 is used to control the second current to flow through the first pole of the first charging port 150, the first pole of the first battery pack 131, the second pole of the first battery pack 131, and the second pole of the first charging port 150 in sequence to charge the first battery pack 131. In this way, when the first charging port is charged with a single gun and the second battery pack is fully charged but the first battery pack is not fully charged, only the first battery pack is charged to achieve capacity balancing.

[0063] In a possible embodiment, if the first charging port 150 is connected to the first charging pile, and the power of the second battery pack 132 is less than the preset power value, and the power of the first battery pack 131 is greater than or equal to the preset power value, the control module 110 is used to control the second current to flow through the first pole of the first charging port 150, the third port 123 of the buck-boost module 120, the first port 121 of the buck-boost module 120, the first pole of the second battery pack 132, the second pole of the second battery pack 132, and the second pole of the first charging port 150 in sequence to charge the second battery pack. In this way, when the first charging port is charged with a single gun and the first battery pack is fully charged but the second battery pack is not fully charged, only the second battery pack is charged to achieve capacity balancing.

[0064] It can be seen that through the above charging circuit, the battery pack can be quickly charged in scenarios such as a single high-voltage charging pile, dual high-voltage charging piles, a single low-voltage charging pile, dual low-voltage charging piles, and one high-voltage charging pile and one low-voltage charging pile, which greatly improves the flexibility and efficiency of vehicle charging and can achieve capacity balance when the capacity between battery packs is unbalanced.

[0065] Combine the following Figure 6 The charging circuit in the embodiment of the present application is described in detail as an example. Figure 6 A structural schematic diagram of another charging circuit provided for an embodiment of the present application includes a buck-boost module 120, a battery pack group 130, a second charging port 140 and a first charging port 150, wherein the battery pack group 130 includes a first battery pack 131, a second battery pack 132, a switch k1, a switch k2, a switch k3, a switch k4, a switch k5, a switch k6, a switch k7, and a pre-charging circuit 160.

[0066] Among them, the switch k2 is set after the first pole of the second charging port 140, the switch k3 is set after the second pole of the second charging port 140, the switch k4 is set after the first pole of the first charging port 150, the switch k5 is set after the second pole of the first charging port 150, the switch k6 is set after the second pole of the second battery pack 132, the switch k7 is set between the switch k1 and the first pole of the second battery pack 132, and the eighth switch k8 is set between the second pole of the first battery pack 131 and the second pole of the first charging port 150.

[0067] Among them, the pre-charging circuit 160 includes a ninth switch k9, a tenth switch k10 and a resistor R, the ninth switch k9 is connected in parallel with the tenth switch k10 and the resistor R, the tenth switch k10 and the resistor R are connected in series, one end of the pre-charging circuit 160 is connected to the first pole of the first charging port 150 and the third port of the buck-boost module 120, and the other end of the pre-charging circuit 160 is connected to the first pole of the first battery pack 131.

[0068] Specifically, the buck-boost module 120 includes a first inductor L1, a second inductor L2, a third inductor L3, a switch tube VT1, a switch tube VT2, a switch tube VT3, a switch tube VT4, a switch tube VT4, a switch tube VT5, a switch tube VT6, a diode VD1, a diode VD2, a diode VD3, a diode VD4, a diode VD5, a diode VD6, a first capacitor C1 and a second capacitor C2.

[0069] Among them, the first inductor L1, the second inductor L2 and the third inductor L3 are connected in parallel with each other, one ends of the first inductor L1, the second inductor L2 and the third inductor L3 are combined and respectively connected to the first pole of the second charging port 140, one end of the second capacitor and one end of the switch k7, the other end of the first inductor L1 is connected to the midpoint of the first inverter bridge, the other end of the second inductor is connected to the midpoint of the second inverter bridge, and the other end of the third inductor is connected to the midpoint of the third inverter bridge. The first inverter bridge is composed of switch tube VT1, switch tube VT2, diode VD1 and diode VD2. The second inverter bridge is composed of switch tube VT3, switch tube VT4, diode VD3 and diode VD4. The third inverter bridge is composed of switch tube VT5, switch tube VT6, diode VD5 and diode VD6.

[0070] It can be understood that the control module controls the first current or the second current to substantially control the switch, the switch tube, etc. to be turned on or off to guide the current to flow along a specific loop. Figure 6 The motor controller IGBT and the motor three-phase coil are reused to reduce the manufacturing cost.

[0071] In a possible embodiment, if the second charging port 140 is connected to the second charging pile, the first charging port 150 is connected to the first charging pile, and the output voltage of the second charging pile and / or the output voltage of the first charging pile is less than a preset voltage value, the control module can control switches k2, k3, k4, k5, k6, k7, k9, and k10 to be closed and switch k1 to be disconnected, so that the first current charges the second battery pack 132 and the second current charges the first battery pack 131.

[0072] In a possible embodiment, if the second charging port 140 is connected to the second charging pile and the output voltage of the second charging pile is greater than or equal to the preset voltage value, the control module can control switches k1, k2, k3, k6, and k9 to be energized, and switch tubes VT1 / VT3 / VT5 to be turned on, so that the first current charges the first battery pack 131 and the second battery pack 132.

[0073] In a possible embodiment, if the first charging port 150 is connected to the first charging pile and the output voltage of the first charging pile is greater than or equal to the preset voltage value, the control module can control switches k1, k4, k5, k6, and k9 to be energized, so that the second current charges the first battery pack 131 and the second battery pack 132.

[0074] In a possible embodiment, if the second charging port 140 is connected to the second charging pile and the output voltage of the second charging pile is less than the preset voltage value, the control module can control switches k1, k2, k3, k6, and k9 to be energized, and at the same time control the switch tubes VT2 / VT4 / VT6 to be turned on and VT1 / VT3 / VT5 to be turned off to charge the inductor, and then control the switch tubes VT2 / VT4 / VT6 to be turned off and VT1 / VT3 / VT5 to be turned on to discharge the inductor, so that the first current is boosted to charge the first battery pack 131 and the second battery pack 132.

[0075] In a possible embodiment, if the first charging port 150 is connected to the first charging pile and the output voltage of the first charging pile is less than the preset voltage value, the control module can control switches k4, k5, k9, k10, k6, and k7 to be closed, switch k1 to be disconnected, and switch tubes VT1 / VT3 / VT5 to be turned on, so that the second current charges the first battery pack 131 and the second battery pack 132 in parallel.

[0076] In a possible embodiment, if the second charging port 140 is connected to the second charging pile, the first charging port 150 is connected to the first charging pile, and the output voltage of the second charging pile and / or the output voltage of the first charging pile is greater than or equal to the preset voltage value, the control module can control switches k1, k2, k3, k4, k5, k6, and k9 to be closed, and switch tubes VT1 / VT3 / VT5 to be turned on, so that the first current charges the first battery pack 131 and the second battery pack 132, and the second current charges the first battery pack 131 and the second battery pack 132.

[0077] In a possible embodiment, if the second charging port 140 is connected to the second charging pile, and the power of the second battery pack 132 is greater than or equal to a preset power value, and the power of the first battery pack 131 is less than the preset power value, the control module can control switches k1, k6, and k7 to be disconnected, switches k2, k3, k9, and k10 to be attracted, and switch tubes VT1 / VT3 / VT5 to be turned on, so that the first current charges the first battery pack 131 alone.

[0078] In a possible embodiment, if the second charging port 140 is connected to the second charging pile, and the power of the second battery pack 132 is less than a preset power value, and the power of the first battery pack 131 is greater than or equal to the preset power value, the control module can control switches k1, k9, and k10 to disconnect, and switches k2, k3, k6, and k7 to close, so that the first current charges the second battery pack 132 alone.

[0079] In a possible embodiment, if the first charging port 150 is connected to a first charging pile, and the power of the second battery pack 132 is greater than or equal to the preset power value, and the power of the first battery pack 131 is less than the preset power value, the control module can control switches k1, k7, and k6 to be disconnected, and switches k4, k5, k9, and k10 to be attracted, so that the second current charges the first battery pack 131 alone.

[0080] In a possible embodiment, if the first charging port is connected to the first charging pile, and the power of the second battery pack is less than the preset power value, and the power of the first battery pack is greater than or equal to the preset power value, the control module can control switches k1, k9, and k10 to be disconnected, switches k4, k5, k6, and k7 to be attracted, and switch tubes VT1 / VT3 / VT5 to be turned on, so that the second current charges the second battery pack 132 alone.

[0081] It can be seen that through the above charging circuit, the battery pack can be quickly charged in scenarios such as single high-voltage charging pile, dual high-voltage charging piles, single low-voltage charging pile, dual low-voltage charging piles, and one high-voltage charging pile and one low-voltage charging pile, greatly improving the flexibility and efficiency of vehicle charging.

[0082] The embodiment of the present application also provides a vehicle, including the charging circuit in the above-mentioned embodiment of the application, which will not be described in detail here.

[0083] The above embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several modifications and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. A charging circuit for a vehicle, characterized in that: The charging circuit includes a first charging port and a battery pack; the battery pack includes a first battery pack and a second battery pack, and the first battery pack and the second battery pack include a series connection state and a parallel connection state; In the series connection state, the first charging port is connected in series with the first battery pack and the second battery pack; In the parallel state, the first battery pack and the second battery pack are connected in parallel, and the first charging port is connected in series with the first battery pack or the second battery pack.

2. The charging circuit according to claim 1, characterized in that: When the voltage of the first charging port is lower than the charging voltage of the battery pack group, the first battery pack and the second battery pack are in parallel.

3. The charging circuit according to claim 1, characterized in that: The first charging port includes a first pole and a second pole, one end of the first battery pack is connected to the first pole of the first charging port, the other end of the first battery pack is connected to one end of the second battery pack, and the other end of the second battery pack is connected to the second pole of the first charging port.

4. The charging circuit according to claim 1, characterized in that: The charging circuit also includes a switch module, which is connected to the first battery pack and the second battery pack and is used to switch the first battery pack and the second battery pack between the series state and the parallel state.

5. The charging circuit according to claim 4, characterized in that: The switch module includes a first switch component switch k1, one end of the switch k1 is connected to the first battery pack, and the other end of the switch k1 is connected to the second battery pack. When the switch k1 is turned on, the first battery pack and the second battery pack are in the series state, and when the switch k1 is turned off, the first battery pack and the second battery pack are in the parallel state.

6. The charging circuit according to claim 5, characterized in that: The first charging port includes a first pole and a second pole, the switch module also includes a second switch component, one end of the second switch component is connected to the first pole, a first connection point and a second connection point are provided between the first battery pack and the second battery pack, one of the first connection point and the second connection point is used to connect one end of the second switch component, the other of the first connection point and the second connection point is used to connect to the second pole of the first charging port, one end of the first battery pack is connected to the first pole of the first charging port, and the other end is connected to the first connection point, one end of the second battery pack is connected to the second connection point, and the other end is connected to the second pole of the first charging port.

7. The charging circuit according to claim 6, characterized in that: The second switch component includes at least one of a switch and a buck-boost module.

8. The charging circuit according to claim 7, characterized in that: The second switch component is switch k7, one end of which is electrically connected to the first pole of the first charging port, and the other end of which is one end of the second switch component, switch k10, one end of which is connected to the first connection point, and the other end of which is connected to the second pole of the first charging port 150.

9. The charging circuit according to any one of claims 1 to 8, characterized in that: The charging circuit also includes a buck-boost module and a second charging port. The buck-boost module is connected between the second charging port and the battery pack. The buck-boost module is used to charge the battery pack by boosting or stepping down the voltage input from the second charging port.

10. The charging circuit according to claim 9, characterized in that: The buck-boost module is a motor assembly, which includes a motor winding and an inverter. One end of the motor winding is connected to the first pole of the second charging port, and the other end of the motor winding is connected to the midpoint of the bridge arm of the inverter. The two ends of the inverter are connected to the two ends of the first battery pack and the second battery pack.

11. The charging circuit according to claim 10, characterized in that: The inverter is configured to control the motor winding to boost the voltage input from the second charging port to charge the first battery pack and the second battery pack.

12. The charging circuit according to claim 9, characterized in that: The charging circuit further includes a charging branch, wherein the charging branch connects a first pole of the second charging port and one end of the second battery pack, and the other end of the second battery pack is connected to a second pole of the second charging port.

13. The charging circuit according to claim 9, characterized in that: The first pole of the second charging port is respectively connected to the first pole of the second battery pack, one end of the switch k1 and the first port of the buck-boost module, the second pole of the second charging port is connected to the second port of the buck-boost module, the third port of the buck-boost module is respectively connected to the first pole of the first charging port and the first pole of the first battery pack, the fourth port of the buck-boost module is respectively connected to the second pole of the first charging port and the second pole of the second battery pack, and the second pole of the first charging port is also connected to the second pole of the first battery pack and the other end of the switch k1.

14. The charging circuit according to claim 13, characterized in that: The charging circuit also includes a control module; The control module is used to control the charging circuit to charge the first battery pack and / or the second battery pack according to the output voltage of the second charging pile connected to the second charging port and / or the output voltage of the first charging pile connected to the first charging port.

15. The charging circuit according to claim 14, characterized in that: If the second charging port is connected to the second charging pile, the first charging port is connected to the first charging pile, and the output voltage of the second charging pile and / or the output voltage of the first charging pile is less than the preset voltage value, the control module is used to control the first current of the second charging pile to flow through the first pole of the second charging port, the first pole of the second battery pack, the second pole of the second battery pack, the fourth port of the buck-boost module, the second port of the buck-boost module, and the second pole of the second charging port in sequence to charge the second battery pack, and the control module is used to control the second current of the first charging pile to flow through the first pole of the first charging port, the first pole of the first battery pack, the second pole of the first battery pack, and the second pole of the first charging port in sequence to charge the first battery pack.

16. The charging circuit according to claim 14, characterized in that: If the second charging port is connected to the second charging pile and the output voltage of the second charging pile is greater than or equal to the preset voltage value, the control module is used to control the first current to flow in sequence through the first pole of the second charging port, the first port of the buck-boost module, the third port of the buck-boost module, the first pole of the first battery pack, the second pole of the first battery pack, the switch k1, the first pole of the second battery pack, the second pole of the second battery pack, the fourth port of the buck-boost module, the second port of the buck-boost module, and the second pole of the second charging port to charge the first battery pack and the second battery pack.

17. The charging circuit according to claim 14, characterized in that: If the first charging port is connected to the first charging pile and the output voltage of the first charging pile is greater than or equal to the preset voltage value, the control module is used to control the second current to flow through the first pole of the first charging port, the first pole of the first battery pack, the second pole of the first battery pack, the switch k1, the first pole of the second battery pack, the second pole of the second battery pack, and the second pole of the first charging port in sequence to charge the first battery pack and the second battery pack.

18. The charging circuit according to claim 14, characterized in that: If the second charging port is connected to the second charging pile and the output voltage of the second charging pile is less than the preset voltage value, the control module is used to control the first current to flow from the first pole of the second charging port through the first port of the buck-boost module into the buck-boost module for boosting to obtain a first boost current, and then make the first boost current flow through the third port of the buck-boost module, the first pole of the first battery pack, the second pole of the first battery pack, the switch k1, the first pole of the second battery pack, the second pole of the second battery pack, the fourth port of the buck-boost module, the second port of the buck-boost module, and the second pole of the second charging port in sequence to charge the first battery pack and the second battery pack.

19. The charging circuit according to claim 14, characterized in that: If the first charging port is connected to the first charging pile and the output voltage of the first charging pile is less than the preset voltage value, the control module is used to control the second current to flow through the first parallel circuit to charge the first battery pack, and the control module is used to control the second current to flow through the second parallel circuit to charge the second battery pack; The first parallel circuit includes a first pole of the first charging port, a first pole of the first battery pack, a second pole of the first battery pack, and a second pole of the first charging port; The second parallel circuit includes a first pole of the first charging port, a third port of the buck-boost module, a first port of the buck-boost module, a first pole of the second battery pack, a second pole of the second battery pack, and a second pole of the first charging port.

20. The charging circuit according to claim 14, characterized in that: If the second charging port is connected to the second charging pile, the first charging port is connected to the first charging pile, and the output voltage of the second charging pile and / or the output voltage of the first charging pile is greater than or equal to the preset voltage value, The control module is used to control the first current to flow sequentially through the first pole of the second charging port, the first port of the buck-boost module, the third port of the buck-boost module, the first pole of the first battery pack, the second pole of the first battery pack, the switch k1, the first pole of the second battery pack, the second pole of the second battery pack, the fourth port of the buck-boost module, the second port of the buck-boost module, and the second pole of the second charging port to charge the first battery pack and the second battery pack. The control module is used to control the second current to flow in sequence through the first pole of the first charging port, the first pole of the first battery pack, the second pole of the first battery pack, the switch k1, the first pole of the second battery pack, the second pole of the second battery pack, and the second pole of the first charging port to charge the first battery pack and the second battery pack.

21. The charging circuit according to claim 14, characterized in that: If the second charging port is connected to the second charging pile, and the power of the second battery pack is greater than or equal to the preset power value, and the power of the first battery pack is less than the preset power value, the control module is used to control the first current to flow through the first pole of the second charging port, the first port of the buck-boost module, the third port of the buck-boost module, the first pole of the first battery pack, the second pole of the first battery pack, the fourth port of the buck-boost module, the second port of the buck-boost module, and the second pole of the second charging port in sequence to charge the first battery pack.

22. The charging circuit according to claim 14, characterized in that: If the second charging port is connected to the second charging pile, and the power of the second battery pack is less than the preset power value and the power of the first battery pack is greater than or equal to the preset power value, the control module is used to control the first current to flow through the first pole of the second charging port, the first pole of the second battery pack, the second pole of the second battery pack, the fourth port of the buck-boost module, the second port of the buck-boost module, and the second pole of the second charging port in sequence to charge the second battery pack.

23. The charging circuit according to claim 14, characterized in that: If the first charging port is connected to a first charging pile, and the power of the second battery pack is greater than or equal to the preset power value, and the power of the first battery pack is less than the preset power value, the control module is used to control the second current to flow through the first pole of the first charging port, the first pole of the first battery pack, the second pole of the first battery pack, and the second pole of the first charging port in sequence to charge the first battery pack.

24. The charging circuit according to claim 14, characterized in that: If the first charging port is connected to the first charging pile, and the power of the second battery pack is less than the preset power value, and the power of the first battery pack is greater than or equal to the preset power value, the control module is used to control the second current to flow through the first pole of the first charging port, the third port of the buck-boost module, the first port of the buck-boost module, the first pole of the second battery pack, the second pole of the second battery pack, and the second pole of the first charging port in sequence to charge the second battery pack.

25. The charging circuit according to claims 1-24, characterized in that: The charging circuit also includes a switch k2, a switch k3, a switch k4, a switch k5, a switch k6, and a switch k8. The switch k2 is arranged behind the first pole of the second charging port, the switch k3 is arranged behind the second pole of the second charging port, the switch k4 is arranged behind the first pole of the first charging port, the switch k5 is arranged behind the second pole of the first charging port, the switch k6 is arranged behind the second pole of the second battery pack, the switch k7 is arranged between the first switch and the first pole of the second battery pack, and the switch k8 is arranged between the second pole of the first battery pack and the second pole of the first charging port.

26. The charging circuit according to claim 25, characterized in that: The charging circuit also includes a pre-charging circuit, which includes a switch k9, a switch k10 and a resistor, the switch k9 is connected in parallel with the switch k10 and the resistor, the switch k10 and the resistor are connected in series, one end of the pre-charging circuit is connected to the first pole of the first charging port and the third port of the buck-boost module, and the other end of the pre-charging circuit is connected to the first pole of the first battery pack.

27. A vehicle, characterized in that: The vehicle comprises the charging circuit according to any one of claims 1-26.

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