Lithium battery power supply topology suitable for rapid charging of single gun and double guns

Abstract

The invention provides a lithium battery power supply topology suitable for quick charging of single and double guns. The lithium battery power supply topology comprises two lithium battery packs, four battery management units, two charging sockets and twelve contactors, in a single-gun charging mode that a charging plug gun is plugged into the first charging socket, the first battery management unit controls the first, second, third, fifth, sixth, seventh, eleventh and twelfth contactors to be closed and controls the fourth and tenth contactors to be disconnected; in a single-gun charging mode that a charging plug gun is plugged into the second charging socket, the second battery management unit controls the first, third, fourth, fifth, eighth, ninth, tenth and twelfth contactors to be closed and controls the second and eleventh contactors to be disconnected; and in a double-gun charging mode that the first charging socket and the second charging socket are both inserted into charging insertion guns, the first battery management unit or the second battery management unit controls the first, second, third, fourth, sixth, ninth, tenth and eleventh contactors to be closed and controls the fifth, seventh, eighth and twelfth contactors to be disconnected.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage and power supply, and in particular to a lithium battery power supply topology suitable for single-gun and double-gun fast charging. Background Art

[0002] In recent years, with the rapid development and popularization of new energy vehicles, the problems of slow charging speed and long time consumption have become increasingly prominent. In particular, there are many low-power charging facilities among the charging facilities currently installed, which further restricts the rapid charging of vehicles.

[0003] Therefore, in order to cope with the increasingly prominent charging problem of new energy vehicles, it is necessary to design a fast-charging lithium battery power supply topology. Summary of the invention

[0004] The present invention provides a lithium battery power supply topology suitable for single-gun and double-gun fast charging, which can solve the technical problem of slow charging speed of current new energy vehicles.

[0005] The present invention provides a lithium battery power supply topology suitable for single-gun and double-gun fast charging, the power supply topology comprising two lithium battery packs, four battery management units, two charging sockets and twelve contactors;

[0006] The positive electrode of the first lithium battery pack is connected to one end of the first contactor, and the negative electrode is respectively connected to one end of the eleventh contactor and one end of the twelfth contactor; the positive electrode of the second lithium battery pack is connected to one end of the third contactor, and the negative electrode is respectively connected to one end of the tenth contactor and the other end of the twelfth contactor; the positive electrode of the first charging socket is connected to one end of the second contactor, and the negative electrode is connected to the other end of the eleventh contactor; the positive electrode of the second charging socket is connected to one end of the fourth contactor, and the negative electrode is connected to the other end of the tenth contactor; one end of the fifth contactor is respectively connected to the other end of the first contactor and the other end of the second contactor, and the other end of the fifth contactor is respectively connected to the other end of the third contactor and the other end of the fourth contactor; one end of the sixth contactor is respectively connected to one end of the first battery management unit and the seventh contactor, and the other end of the sixth contactor is connected to the third battery management unit; the other end of the seventh contactor is connected to the fourth battery management unit; one end of the eighth contactor is respectively connected to one end of the second battery management unit and the ninth contactor; the other end of the ninth contactor is connected to the fourth battery management unit;

[0007] The first battery management unit is used to determine whether the first charging socket and / or the second charging socket is inserted into a charging plug, and controls the closing or disconnection of each contactor according to whether the first charging socket and / or the second charging socket is inserted into the charging plug, and is also used to feed back the battery parameters of the first lithium battery group and / or the second lithium battery group to the charging pile; the second battery management unit is used to determine whether the first charging socket and / or the second charging socket is inserted into a charging plug, and controls the closing or disconnection of each contactor according to whether the first charging socket and / or the second charging socket is inserted into the charging plug, and is also used to feed back the battery parameters of the first lithium battery group and / or the second lithium battery group to the charging pile; the third battery management unit is used to monitor the battery parameters of the first lithium battery group and feed back to the first battery management unit or the second battery management unit; the fourth battery management unit is used to monitor the battery parameters of the second lithium battery group and feed back to the first battery management unit or the second battery management unit;

[0008] In the single-charger charging mode in which the first charging socket is inserted into the charging plug, the first battery management unit controls the first contactor, the second contactor, the third contactor, the fifth contactor, the sixth contactor, the seventh contactor, the eleventh contactor and the twelfth contactor to close, and controls the fourth contactor and the tenth contactor to open;

[0009] In the single-charger charging mode in which the second charging socket is inserted into the charging plug, the second battery management unit controls the first contactor, the third contactor, the fourth contactor, the fifth contactor, the eighth contactor, the ninth contactor, the tenth contactor and the twelfth contactor to close, and controls the second contactor and the eleventh contactor to open;

[0010] In the dual-gun charging mode in which both the first charging socket and the second charging socket are inserted with charging plugs, the first battery management unit or the second battery management unit controls the first contactor, the second contactor, the third contactor, the fourth contactor, the sixth contactor, the ninth contactor, the tenth contactor and the eleventh contactor to close, and controls the fifth contactor, the seventh contactor, the eighth contactor and the twelfth contactor to open.

[0011] Preferably, the battery parameters include temperature, voltage, current, SOC and SOH of the battery pack.

[0012] Preferably, during the charging process of the first lithium battery group and the second lithium battery group, a constant current charging mode is first adopted and then a constant voltage charging mode is adopted. When the charging current drops to a preset current value or the single cell voltage is greater than an overvoltage warning value, it is determined that the first lithium battery group and the second lithium battery group are fully charged.

[0013] Preferably, when the first lithium battery group and the second lithium battery group are in a constant current charging mode in a single-gun charging mode, the required charging current of the first lithium battery group acquired by the third battery management unit is obtained by the following formula:

[0014] I 需求,1 =I 额定,1 ×SOH min,1 ×N 1 ×[|0.9-SOC min,1 |+0.1];

[0015] The required charging current of the second lithium battery pack obtained by the fourth battery management unit is obtained by the following formula:

[0016] I 需求,2 =I 额定,2 ×SOH min,2 ×N 2 ×[|0.9-SOC min,2 |+0.1];

[0017] The charging current reported by the first battery management unit or the second battery management unit to the charging pile is obtained by the following formula:

[0018] I 需求,总 =I 需求,1 +I 需求,2 ;

[0019] In the formula, I 需求,1 ,I 需求,2 are the required charging currents of the first lithium battery pack and the second lithium battery pack, I 额定,1 ,I 额定,2 The rated charging current of the battery cells in the first lithium battery pack and the second lithium battery pack, SOH min,1 , SOH min,2 are the minimum SOH values ​​of the battery cells in the first lithium battery group and the second lithium battery group, respectively. min,1 , SOC min,2 are the minimum SOC values ​​of the battery cells in the first lithium battery pack and the second lithium battery pack, respectively. 需求,总 The charging current reported by the first battery management unit or the second battery management unit to the charging pile.

[0020] Preferably, when the first lithium battery group and the second lithium battery group are in a constant current charging mode in a dual-gun charging mode, the required charging current of the first lithium battery group acquired by the third battery management unit is obtained by the following formula:

[0021] I 需求,1 =I 额定,1 ×SOH min,1 ×N 1×[|0.9-SOC min,1 |+0.1];

[0022] The required charging current of the second lithium battery pack obtained by the fourth battery management unit is obtained by the following formula:

[0023] I 需求,2 =I 额定,2 ×SOH min,2 ×N 2 ×[|0.9-SOC min,2 |+0.1];

[0024] The charging current reported by the first battery management unit to the charging pile is obtained by the following formula:

[0025] I′ 需求,1 =I 需求,1 ;

[0026] The charging current reported by the second battery management unit to the charging pile is obtained by the following formula:

[0027] I′ 需求,2 =I 需求,2 ;

[0028] In the formula, I 需求,1 ,I 需求,2 are the required charging currents of the first lithium battery pack and the second lithium battery pack, I 额定,1 ,I 额定,2 The rated charging current of the battery cells in the first lithium battery pack and the second lithium battery pack, SOH min,1 , SOH min,2 are the minimum SOH values ​​of the battery cells in the first lithium battery group and the second lithium battery group, respectively. min,1 , SOC min,2 are the minimum SOC values ​​of the battery cells in the first lithium battery pack and the second lithium battery pack, respectively, I′ 需求,1 , I′ 需求,2 The charging current reported to the charging pile by the first battery management unit and the second battery management unit respectively.

[0029] Preferably, the power supply topology also includes a first diode and a second diode; the first diode is arranged between the first lithium battery group and the first contactor, and the positive electrode of the first diode is connected to the first contactor, and the negative electrode is connected to the positive electrode of the first lithium battery group; the second diode is arranged between the second lithium battery group and the third contactor, and the positive electrode of the second diode is connected to the third contactor, and the negative electrode is connected to the positive electrode of the second lithium battery group.

[0030] Preferably, the power supply topology further includes a first protection fuse and a second protection fuse, the first protection fuse is arranged between the first diode and the first contactor, and the second protection fuse is arranged between the second diode and the third contactor.

[0031] Preferably, the power supply topology further includes an on-board charging panel, and the first charging socket and the second charging socket are both arranged on the on-board charging panel.

[0032] The technical solution of the present invention is applied, and a dual-branch design is adopted to divide the battery group into a first lithium battery group and a second lithium battery group, which is suitable for both dual-gun charging and single-gun charging modes; at the same time, the dual branches are connected in parallel for output, and when any branch fails, the other branch can continue to output to the outside, thereby improving the reliability of the system. The present invention can be compatible with high / low power single-gun charging, and can be extended to low-power dual-gun and high-power dual-gun charging, thereby improving the charging and replenishment speed. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] The included drawings are used to provide a further understanding of the embodiments of the present invention, which constitute a part of the specification, are used to illustrate the embodiments of the present invention, and together with the text description, explain the principles of the present invention. Obviously, the drawings in the following description are only some embodiments of the present invention, and for ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0034] Figure 1 A schematic diagram of a lithium battery power supply topology suitable for single-gun and double-gun fast charging provided according to an embodiment of the present invention is shown.

[0035] The above drawings include the following reference numerals:

[0036] 1. Protection fuse; 2. Diode; 3. Lithium battery pack; 4. Battery management unit; 5. On-board charging panel; 6. Distribution box; 7. Contactor; 8. Charging socket. DETAILED DESCRIPTION

[0037] It should be noted that, in the absence of conflict, the embodiments in this application and the features in the embodiments can be combined with each other. The technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. The following description of at least one exemplary embodiment is actually only illustrative and is by no means intended to limit the present invention and its application or use. Based on the embodiments in the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0038] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, it indicates the presence of features, steps, operations, devices, components and / or combinations thereof.

[0039] Unless otherwise specifically stated, the relative arrangement of the parts and steps described in these embodiments, numerical expressions and numerical values ​​do not limit the scope of the present invention. At the same time, it should be understood that, for ease of description, the sizes of the various parts shown in the accompanying drawings are not drawn according to the actual proportional relationship. The technology, method and equipment known to ordinary technicians in the relevant field may not be discussed in detail, but in appropriate cases, the technology, method and equipment should be regarded as a part of the authorization specification. In all examples shown and discussed here, any specific value should be interpreted as being merely exemplary, rather than as a limitation. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once a certain item is defined in an accompanying drawing, it does not need to be further discussed in subsequent drawings.

[0040] like Figure 1 As shown, the present invention provides a lithium battery power supply topology suitable for single-gun and double-gun fast charging, and the power supply topology includes two lithium battery packs 3, four battery management units 4, two charging sockets 8 and twelve contactors 7;

[0041] The positive electrode of the first lithium battery pack is connected to one end of the first contactor, and the negative electrode is respectively connected to one end of the eleventh contactor and one end of the twelfth contactor; the positive electrode of the second lithium battery pack is connected to one end of the third contactor, and the negative electrode is respectively connected to one end of the tenth contactor and the other end of the twelfth contactor; the positive electrode of the first charging socket is connected to one end of the second contactor, and the negative electrode is connected to the other end of the eleventh contactor; the positive electrode of the second charging socket is connected to one end of the fourth contactor, and the negative electrode is connected to the other end of the tenth contactor; one end of the fifth contactor is respectively connected to the other end of the first contactor and the other end of the second contactor, and the other end of the fifth contactor is respectively connected to the other end of the third contactor and the other end of the fourth contactor; one end of the sixth contactor is respectively connected to one end of the first battery management unit and the seventh contactor, and the other end of the sixth contactor is connected to the third battery management unit; the other end of the seventh contactor is connected to the fourth battery management unit; one end of the eighth contactor is respectively connected to one end of the second battery management unit and the ninth contactor; the other end of the ninth contactor is connected to the fourth battery management unit;

[0042] The first battery management unit (BMS unit) is used to determine whether the first charging socket and / or the second charging socket is inserted into a charging plug, and controls the closing or disconnection of each contactor 7 according to whether the first charging socket and / or the second charging socket is inserted into the charging plug, and is also used to feed back the battery parameters of the first lithium battery group and / or the second lithium battery group to the charging pile; the second battery management unit is used to determine whether the first charging socket and / or the second charging socket is inserted into a charging plug, and controls the closing or disconnection of each contactor 7 according to whether the first charging socket and / or the second charging socket is inserted into the charging plug, and is also used to feed back the battery parameters of the first lithium battery group and / or the second lithium battery group to the charging pile; the third battery management unit is used to monitor the battery parameters of the first lithium battery group and feed back to the first battery management unit or the second battery management unit; the fourth battery management unit is used to monitor the battery parameters of the second lithium battery group and feed back to the first battery management unit or the second battery management unit; wherein, when the current charging socket is inserted into the charging plug, the first battery management unit and the second battery management unit can detect the CC (connection confirmation) signal of the charging plug.

[0043] In the single-gun charging mode in which the first charging socket is inserted into the charging plug, the first battery management unit controls the first contactor, the second contactor, the third contactor, the fifth contactor, the sixth contactor, the seventh contactor, the eleventh contactor and the twelfth contactor to close, and controls the fourth contactor and the tenth contactor to open.

[0044] At this time, the charging plug is inserted into the first charging socket, the charging pile communicates with the first battery management unit, the first battery management unit communicates with the third battery management unit and the fourth battery management unit respectively, and the charging pile charges the first lithium battery pack and the second lithium battery pack at the same time;

[0045] In the single-gun charging mode when the second charging socket is inserted into the charging plug, the second battery management unit controls the first contactor, the third contactor, the fourth contactor, the fifth contactor, the eighth contactor, the ninth contactor, the tenth contactor and the twelfth contactor to close, and controls the second contactor and the eleventh contactor to open.

[0046] At this time, the charging plug is inserted into the second charging socket; at this time, the charging plug is inserted into the second charging socket, the charging pile communicates with the second battery management unit, the second battery management unit communicates with the third battery management unit and the fourth battery management unit respectively, and the charging pile charges the first lithium battery pack and the second lithium battery pack at the same time;

[0047] In the dual-gun charging mode in which both the first charging socket and the second charging socket are inserted with charging plugs, the first battery management unit or the second battery management unit controls the first contactor, the second contactor, the third contactor, the fourth contactor, the sixth contactor, the ninth contactor, the tenth contactor and the eleventh contactor to close, and controls the fifth contactor, the seventh contactor, the eighth contactor and the twelfth contactor to open.

[0048] At this time, the two charging plugs are respectively inserted into the first charging socket and the second charging socket. After the first battery management unit detects the CC signals of the two charging plugs, it controls the sixth contactor to close and the seventh contactor to disconnect; after the second battery management unit detects the CC signals of the two charging plugs, it controls the ninth contactor to close and the eighth contactor to disconnect; the first charging pile communicates with the first battery management unit, and the first battery management unit communicates with the third battery management unit; the second charging pile communicates with the second battery management unit, and the second battery management unit communicates with the fourth battery management unit; the first charging pile charges the first lithium battery pack, and the second charging pile charges the second lithium battery pack.

[0049] The present invention adopts a dual-branch design, dividing the battery pack into a first lithium battery pack and a second lithium battery pack, which is suitable for both dual-gun charging and single-gun charging modes; at the same time, the dual branches are connected in parallel for output, and when any branch fails, the other branch can continue to output to the outside, thereby improving the reliability of the system. The present invention can be compatible with high / low power single-gun charging, and can be extended to low-power dual-gun and high-power dual-gun charging, thereby improving the charging and replenishment speed.

[0050] In the present invention, the number of series-parallel connections of the first lithium battery pack and the second lithium battery pack are the same, so that it is suitable for dual-gun charging.

[0051] According to an embodiment of the present invention, the battery parameters include temperature, voltage, current, SOC (state of charge) and SOH (state of health) of the battery pack.

[0052] According to an embodiment of the present invention, during the charging process of the first lithium battery pack and the second lithium battery pack, a constant current (CC) charging mode is first adopted, and then a constant voltage (CV) charging mode (charging end) is adopted. When the charging current drops to a preset current value or the single cell voltage is greater than the overvoltage warning value, the first lithium battery pack and the second lithium battery pack are determined to be fully charged. During the entire charging process, the battery pack first reports a maximum charging voltage, and then reports the required charging current.

[0053] According to an embodiment of the present invention, when the first lithium battery group and the second lithium battery group are in a constant current charging mode in a single-gun charging mode, the required charging current of the first lithium battery group acquired by the third battery management unit is obtained by the following formula:

[0054] I 需求,1 =I 额定,1 ×SOH min,1 ×N 1 ×[|0.9-SOC min,1 |+0.1];

[0055] The required charging current of the second lithium battery pack obtained by the fourth battery management unit is obtained by the following formula:

[0056] I 需求,2 =I 额定,2 ×SOH min,2 ×N 2 ×[|0.9-SOC min,2 |+0.1];

[0057] The charging current reported by the first battery management unit or the second battery management unit to the charging pile is obtained by the following formula:

[0058] I 需求,总 =I 需求,1 +I 需求,2 ;

[0059] In the formula, I 需求,1 ,I 需求,2 are the required charging currents of the first lithium battery pack and the second lithium battery pack, I 额定,1 ,I 额定,2 The rated charging current of the battery cells in the first lithium battery pack and the second lithium battery pack, SOH min,1 , SOH min,2 are the minimum SOH values ​​of the battery cells in the first lithium battery group and the second lithium battery group, respectively. min,1 , SOC min,2 are the minimum SOC values ​​of the battery cells in the first lithium battery pack and the second lithium battery pack, respectively. 需求,总 The charging current reported by the first battery management unit or the second battery management unit to the charging pile.

[0060] According to an embodiment of the present invention, when the first lithium battery group and the second lithium battery group are in a constant current charging mode in a dual-gun charging mode, the required charging current of the first lithium battery group acquired by the third battery management unit is obtained by the following formula:

[0061] I 需求,1 =I 额定,1 ×SOH min,1 ×N1 × [|0.9 - SOC min,1 | + 0.1];

[0062] The required charging current of the second lithium battery pack obtained by the fourth battery management unit is obtained through the following formula:

[0063] I 需求,2 = I 额定,2 × SOH min,2 × N 2 × [|0.9 - SOC min,2 | + 0.1];

[0064] The charging current reported by the first battery management unit to the charging pile is obtained through the following formula:

[0065] I' 需求,1 = I 需求,1 ;

[0066] The charging current reported by the second battery management unit to the charging pile is obtained through the following formula:

[0067] I' 需求,2 = I 需求,2 ;

[0068] In the formula, I 需求,1 , I 需求,2 are respectively the required charging currents of the first lithium battery pack and the second lithium battery pack, I 额定,1 , I 额定,2 are respectively the rated charging currents of the battery cells in the first lithium battery pack and the second lithium battery pack, SOH min,1 , SOH min,2 are respectively the minimum values of SOH of the battery cells in the first lithium battery pack and the second lithium battery pack, SOC min,1 , SOC min,2 are respectively the minimum values of SOC of the battery cells in the first lithium battery pack and the second lithium battery pack, I' 需求 ,1, I' 需求,2 are respectively the charging currents reported by the first battery management unit and the second battery management unit to the charging pile.

[0069] According to an embodiment of the present invention, the power supply topology further includes a first diode and a second diode; the first diode is disposed between the first lithium battery pack and the first contactor, and the positive electrode of the first diode is connected to the first contactor, and the negative electrode is connected to the positive electrode of the first lithium battery pack; the second diode is disposed between the second lithium battery pack and the third contactor, and the positive electrode of the second diode is connected to the third contactor, and the negative electrode is connected to the positive electrode of the second lithium battery pack. This diode 2 conducts forwardly and cuts off reversely.

[0070] According to an embodiment of the present invention, the power supply topology further includes a first protection fuse and a second protection fuse, wherein the first protection fuse is arranged between the first diode and the first contactor, and the second protection fuse is arranged between the second diode and the third contactor. The protection fuse 1 is used to disconnect the circuit and play a protective role when the current is too large and exceeds the allowed threshold.

[0071] According to an embodiment of the present invention, the power supply topology further includes an on-board charging panel 5, and the first charging socket and the second charging socket are both arranged on the on-board charging panel 5. The two charging sockets 8 are used for connecting and interacting with external charging facilities.

[0072] According to one embodiment of the present invention, the power supply topology also includes a distribution box 6, which is used to place a first battery management unit, a second battery management unit, a first contactor, a second contactor, a third contactor, a fourth contactor and a fifth contactor, and is used for coordinated control and power distribution between the first lithium battery group and the second lithium battery group.

[0073] In summary, the present invention provides a lithium battery power supply topology suitable for single and double gun fast charging, which has the following beneficial effects compared with the prior art:

[0074] 1. A diode and a fuse are installed on the charging circuit of the lithium battery pack 3 to provide safety protection such as current backflow and overcurrent protection;

[0075] 2. The dual-branch design is adopted to divide the battery pack into the first lithium battery pack and the second lithium battery pack, which is suitable for dual-gun charging. At the same time, the dual branches are connected in parallel for external output. When any branch fails, the BMS is used to isolate the faulty branch from the system, and the remaining branch can continue to output externally, thereby improving the reliability of the system;

[0076] 3. Compatible with the single-gun charging mode commonly used in new energy vehicles, and can also be expanded to use the dual-gun charging mode, thereby increasing the charging speed as much as possible;

[0077] 4. Single or double gun charging mode can be selected according to different application scenarios;

[0078] 5. The multi-factor coupled charging of the battery pack SOC and SOH is considered.

[0079] In the description of the present invention, it is necessary to understand that the directions or positional relationships indicated by directional words such as "front, back, up, down, left, right", "lateral, vertical, perpendicular, horizontal" and "top, bottom" are usually based on the directions or positional relationships shown in the drawings. They are only for the convenience of describing the present invention and simplifying the description. Unless otherwise specified, these directional words do not indicate or imply that the devices or elements referred to must have a specific direction or be constructed and operated in a specific direction. Therefore, they cannot be understood as limiting the scope of protection of the present invention. The directional words "inside and outside" refer to the inside and outside relative to the contours of each component itself.

[0080] For ease of description, spatially relative terms such as "above", "above", "on the upper surface of", "above", etc. may be used here to describe the spatial positional relationship between a device or feature and other devices or features as shown in the figure. It should be understood that spatially relative terms are intended to include different orientations of the device in use or operation in addition to the orientation described in the figure. For example, if the device in the accompanying drawings is inverted, the device described as "above other devices or structures" or "above other devices or structures" will be positioned as "below other devices or structures" or "below other devices or structures". Thus, the exemplary term "above" can include both "above" and "below". The device can also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatially relative descriptions used here are interpreted accordingly.

[0081] In addition, it should be noted that the use of terms such as "first" and "second" to limit components is only for the convenience of distinguishing the corresponding components. If not otherwise stated, the above terms have no special meaning and therefore cannot be understood as limiting the scope of protection of the present invention.

[0082] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. For those skilled in the art, the present invention may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lithium battery power supply topology suitable for single and double gun fast charging, It is characterized in that The power supply topology includes two lithium battery packs, four battery management units, two charging sockets and twelve contactors; The positive electrode of the first lithium battery pack is connected to one end of the first contactor, and the negative electrode is respectively connected to one end of the eleventh contactor and one end of the twelfth contactor; the positive electrode of the second lithium battery pack is connected to one end of the third contactor, and the negative electrode is respectively connected to one end of the tenth contactor and the other end of the twelfth contactor; the positive electrode of the first charging socket is connected to one end of the second contactor, and the negative electrode is connected to the other end of the eleventh contactor; the positive electrode of the second charging socket is connected to one end of the fourth contactor, and the negative electrode is connected to the other end of the tenth contactor; one end of the fifth contactor is respectively connected to the other end of the first contactor and the other end of the second contactor, and the other end of the fifth contactor is respectively connected to the other end of the third contactor and the other end of the fourth contactor; one end of the sixth contactor is respectively connected to one end of the first battery management unit and the seventh contactor, and the other end of the sixth contactor is connected to the third battery management unit; the other end of the seventh contactor is connected to the fourth battery management unit; one end of the eighth contactor is respectively connected to one end of the second battery management unit and the ninth contactor; the other end of the ninth contactor is connected to the fourth battery management unit; The first battery management unit is used to determine whether the first charging socket and / or the second charging socket are inserted into a charging plug, and control the closing or opening of each contactor according to whether the first charging socket and / or the second charging socket are inserted into a charging plug, and is also used to feed back the battery parameters of the first lithium battery pack and / or the second lithium battery pack to the charging pile; The second battery management unit is used to determine whether the first charging socket and / or the second charging socket is inserted into a charging plug, and control the closing or opening of each contactor according to whether the first charging socket and / or the second charging socket is inserted into a charging plug, and is also used to feed back the battery parameters of the first lithium battery pack and / or the second lithium battery pack to the charging pile; The third battery management unit is used to monitor the battery parameters of the first lithium battery pack and feed back to the first battery management unit or the second battery management unit; The fourth battery management unit is used to monitor the battery parameters of the second lithium battery pack and feed back to the first battery management unit or the second battery management unit; In the single-charger charging mode in which the first charging socket is inserted into the charging plug, the first battery management unit controls the first contactor, the second contactor, the third contactor, the fifth contactor, the sixth contactor, the seventh contactor, the eleventh contactor and the twelfth contactor to close, and controls the fourth contactor and the tenth contactor to open; In the single-charger charging mode in which the second charging socket is inserted into the charging plug, the second battery management unit controls the first contactor, the third contactor, the fourth contactor, the fifth contactor, the eighth contactor, the ninth contactor, the tenth contactor and the twelfth contactor to close, and controls the second contactor and the eleventh contactor to open; In the dual-gun charging mode in which both the first charging socket and the second charging socket are inserted with charging plugs, the first battery management unit or the second battery management unit controls the first contactor, the second contactor, the third contactor, the fourth contactor, the sixth contactor, the ninth contactor, the tenth contactor and the eleventh contactor to close, and controls the fifth contactor, the seventh contactor, the eighth contactor and the twelfth contactor to open.

2. The power supply topology according to claim 1, It is characterized in that The battery parameters include temperature, voltage, current, SOC and SOH of the battery pack.

3. The power supply topology according to claim 1 or 2, It is characterized in that During the charging process of the first lithium battery group and the second lithium battery group, a constant current charging mode is first adopted, and then a constant voltage charging mode is adopted. When the charging current drops to a preset current value or the single cell voltage is greater than an overvoltage warning value, it is determined that the first lithium battery group and the second lithium battery group are fully charged.

4. The power supply topology according to any one of claims 1 to 3, It is characterized in that When the first lithium battery group and the second lithium battery group are in a constant current charging mode in a single-gun charging mode, the required charging current of the first lithium battery group acquired by the third battery management unit is obtained by the following formula: I 需求,1 =I 额定,1 ×SOH min,1 ×N 1 ×[|0.9-SOC min,1 |+0.1]; The required charging current of the second lithium battery pack obtained by the fourth battery management unit is obtained by the following formula: I 需求,2 =I 额定,2 ×SOH min,2 ×N 2 ×[|0.9-SOC min,2 |+0.1]; The charging current reported by the first battery management unit or the second battery management unit to the charging pile is obtained by the following formula: I 需求,总 =I 需求,1 +I 需求,2 ; In the formula, I 需求,1 ,I 需求,2 are the required charging currents of the first lithium battery pack and the second lithium battery pack, I 额定,1 ,I 额定,2 The rated charging current of the battery cells in the first lithium battery pack and the second lithium battery pack, SOH min,1 , SOH min,2 are the minimum SOH values ​​of the battery cells in the first lithium battery group and the second lithium battery group, respectively. min,1 , SOC min,2 are the minimum SOC values ​​of the battery cells in the first lithium battery pack and the second lithium battery pack, respectively. 需求,总 The charging current reported by the first battery management unit or the second battery management unit to the charging pile.

5. The power supply topology according to claim 4, It is characterized in that When the first lithium battery pack and the second lithium battery pack are in the constant current charging mode in the dual-gun charging mode, the required charging current of the first lithium battery pack acquired by the third battery management unit is obtained by the following formula: I 需求,1 =I 额定,1 ×SOH min,1 ×N 1 ×[|0.9-SOC min,1 |+0.1]; The required charging current of the second lithium battery pack obtained by the fourth battery management unit is obtained by the following formula: I 需求,2 =I 额定,2 ×SOH min,2 ×N 2 ×[|0.9-SOC min,2 |+0.1]; The charging current reported by the first battery management unit to the charging pile is obtained by the following formula: I′ 需求,1 =I 需求,1 ; The charging current reported by the second battery management unit to the charging pile is obtained by the following formula: I′ 需求,2 =I 需求,2 ; In the formula, I 需求,1 ,I 需求,2 are the required charging currents of the first lithium battery pack and the second lithium battery pack, I 额定,1 ,I 额定,2 The rated charging current of the battery cells in the first lithium battery pack and the second lithium battery pack, SOH min,1 , SOH min,2 are the minimum SOH values ​​of the battery cells in the first lithium battery group and the second lithium battery group, respectively. min,1 , SOC min,2 are the minimum SOC values ​​of the battery cells in the first lithium battery pack and the second lithium battery pack, respectively, I′ 需求,1 , I′ 需求,2 The charging current reported to the charging pile by the first battery management unit and the second battery management unit respectively.

6. The power supply topology according to claim 1, It is characterized in that The power supply topology also includes a first diode and a second diode; the first diode is arranged between the first lithium battery pack and the first contactor, and the positive electrode of the first diode is connected to the first contactor, and the negative electrode is connected to the positive electrode of the first lithium battery pack; the second diode is arranged between the second lithium battery pack and the third contactor, and the positive electrode of the second diode is connected to the third contactor, and the negative electrode is connected to the positive electrode of the second lithium battery pack.

7. The power supply topology according to claim 1, It is characterized in that The power supply topology further includes a first protection fuse and a second protection fuse, wherein the first protection fuse is arranged between the first diode and the first contactor, and the second protection fuse is arranged between the second diode and the third contactor.

8. The power supply topology according to claim 1, It is characterized in that The power supply topology further includes an on-vehicle charging panel, and the first charging socket and the second charging socket are both arranged on the on-vehicle charging panel.

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