Driving system and vehicle

Abstract

The utility model discloses a driving system and a vehicle, and the driving system comprises a power battery which comprises a plurality of battery cell groups which are connected in series; the motor controller group comprises a plurality of motor controllers which are connected in series; the motor group comprises a plurality of motors; wherein the motor controller groups are connected to the two ends of the power battery in parallel, and a series connection point between every two adjacent motor controllers is connected with a series connection point between every two adjacent battery cell groups corresponding to the motor controllers; and the output end of each motor controller is connected with the input end of the corresponding motor. According to the invention, the voltage level of each motor controller can be effectively reduced, so that the cost of power electronic components in the motor controller is reduced.

Description

Technical Field

[0001] The present application relates to the field of vehicle driving technology, and more specifically to a driving system and a vehicle. Background Art

[0002] The three-electric architecture of electric vehicles is the key to determining the driving performance of electric vehicles. The classic two-wheel drive three-electric architecture is as follows: Figure 1 As shown in the figure, it includes a power battery, a motor and a motor controller (which can be referred to as an electric control). The motor controller is connected in parallel to both ends of the power battery. Figure 2 As shown, it includes a power battery, two motors and two motor controllers, the two motor controllers are connected in parallel and each motor controller is connected in parallel to both ends of the power battery. Generally, in order to reduce the charging time of electric vehicles, the voltage level of power batteries is getting higher and higher (under the same current, more power can be charged). Correspondingly, in order to adapt to higher voltages, the voltage level of the electric control in the three-electric architecture is also increasing synchronously.

[0003] However, the increase in the voltage level of the electronic control will lead to an increase in the cost of the power electronic components in the electronic control.

[0004] In view of the above technical problems, the present application provides a new drive system and vehicle. Utility Model Content

[0005] The present application is proposed to solve at least one of the above problems. According to one aspect of the present application, a drive system is provided, the drive system comprising: a power battery, comprising a plurality of battery cell groups connected in series; a motor controller group, comprising a plurality of motor controllers connected in series; a motor group, comprising a plurality of motors; wherein the motor controller group is connected in parallel to both ends of the power battery, and the series connection point between two adjacent motor controllers is connected to the series connection point between two corresponding adjacent battery cell groups; and the output end of each motor controller is connected to the input end of a corresponding motor.

[0006] In some embodiments of the present application, the multiple battery cell groups include a first battery cell group and a second battery cell group connected in series, the multiple motor controllers include a first motor controller and a second motor controller connected in series, and the multiple motors include a first motor and a second motor, wherein the series connection point between the first motor controller and the second motor controller is connected to the series connection point between the first battery cell group and the second battery cell group; and the output end of the first motor controller is connected to the input end of the first motor, and the output end of the second motor controller is connected to the input end of the second motor.

[0007] In some embodiments of the present application, the first motor controller is connected in parallel to both ends of the first battery cell group, and the second motor controller is connected in parallel to both ends of the second battery cell group.

[0008] In some embodiments of the present application, when the driving power that the drive system needs to output to the outside world is less than or equal to a first preset power, the first motor controller controls the operation of the first motor, or the second motor controller controls the operation of the second motor; when the driving power that the drive system needs to output to the outside world is greater than the first preset power, the first motor controller controls the operation of the first motor, and the second motor controller controls the operation of the second motor.

[0009] In some embodiments of the present application, when the driving power that the drive system needs to output to the outside world is less than or equal to a first preset power, the first motor controller controls the operation of the first motor; when the driving power that the drive system needs to output to the outside world is greater than the first preset power and less than or equal to a second preset power, the second motor controller controls the operation of the second motor; when the driving power that the drive system needs to output to the outside world is greater than the second preset power, the first motor controller controls the operation of the first motor, and the second motor controller controls the operation of the second motor; wherein, the first preset power is less than the second preset power, and the maximum driving power of the second motor is greater than the maximum driving power of the first motor.

[0010] In some embodiments of the present application, when the first battery cell group is in a fault state, the second motor controller controls the operation of the second motor; or when the second battery cell group is in a fault state, the first motor controller controls the operation of the first motor.

[0011] In some embodiments of the present application, when the power of the first battery cell group is greater than the power of the second battery cell group, the first battery cell group transfers power to the second battery cell group through the first motor controller and the second motor controller.

[0012] In some embodiments of the present application, the first battery cell group transfers electricity to the second battery cell group through the first motor controller and the second motor controller, including: in a first time period, the first motor controller is in a first conduction state and the second motor controller is in an off state, and the first battery cell group discharges to the winding of the first motor through the first motor controller; in a second time period, the first motor controller is in a second conduction state and the second motor controller is in a third conduction state, and the winding of the first motor charges the winding of the second motor through the first motor controller and the second motor controller; in a third time period, the first motor controller is in an off state and the second motor controller is in a fourth conduction state, and the winding of the second motor charges to the second battery cell group through the second motor controller.

[0013] In some embodiments of the present application, when the power of the second battery cell group is greater than the power of the first battery cell group, the second battery cell group transfers power to the first battery cell group through the second motor controller and the first motor controller.

[0014] In some embodiments of the present application, the second battery cell group transfers electricity to the first battery cell group through the second motor controller and the first motor controller, including: in a first time period, the second motor controller is in a fourth conduction state and the first motor controller is in an off state, and the second battery cell group discharges to the winding of the second motor through the second motor controller; in a second time period, the second motor controller is in a third conduction state and the first motor controller is in a second conduction state, and the winding of the second motor charges the winding of the first motor through the second motor controller and the first motor controller; in a third time period, the second motor controller is in an off state and the first motor controller is in a first conduction state, and the winding of the first motor charges to the first battery cell group through the first motor controller.

[0015] In some embodiments of the present application, the series connection point between the first battery cell group and the second battery cell group is the potential midpoint of the power battery.

[0016] In some embodiments of the present application, the drive system further includes a third motor controller and a third motor, the third motor controller is connected in parallel to both ends of the power battery, and the output end of the third motor controller is connected to the input end of the third motor.

[0017] According to yet another aspect of the present application, a vehicle is provided, comprising the driving system.

[0018] According to the drive system and vehicle of the embodiments of the present application, by dividing the power battery into multiple battery cell groups connected in series, the motor controller group is connected in parallel to the two ends of the power battery, and the series connection point between two adjacent motor controllers is connected to the series connection point between the corresponding two adjacent battery cell groups, so that each motor controller is connected in parallel to only one battery cell group. Compared with the method of directly connecting the motor controller in parallel to the two ends of the power battery, the voltage level of each motor controller can be effectively reduced, thereby reducing the cost of power electronic components in the motor controller. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] By describing the embodiments of the present application in more detail in conjunction with the accompanying drawings, the above and other purposes, features and advantages of the present application will become more apparent. The accompanying drawings are used to provide a further understanding of the embodiments of the present application and constitute a part of the specification. Together with the embodiments of the present application, they are used to explain the present application and do not constitute a limitation of the present application. In the accompanying drawings, the same reference numerals generally represent the same components or steps.

[0020] Figure 1 The topological structure diagram of the classic two-wheel drive and three-electric architecture is shown.

[0021] Figure 2 The topological structure diagram of the classic four-wheel drive three-electric architecture is shown.

[0022] Figure 3 A topological structure diagram of a drive system provided according to an embodiment of the present application is shown.

[0023] Figure 4 A topological structure diagram of a drive system provided according to another embodiment of the present application is shown.

[0024] Figure 5A to Figure 5C A schematic diagram showing the transfer of electricity from a first battery cell group to a second battery cell group provided according to an embodiment of the present application is shown.

[0025] Figure 6A to Figure 6C A schematic diagram showing the transfer of electricity from the second battery cell group to the first battery cell group according to an embodiment of the present application is shown.

[0026] Figure 7 A topological structure diagram of a drive system provided according to another embodiment of the present application is shown.

[0027] In the attached figure:

[0028] 100 drive system;

[0029] 111 first battery cell group;

[0030] 112 second battery cell group;

[0031] 121 first motor controller;

[0032] 122 second motor controller;

[0033] 131 First Motor;

[0034] 132 Second Motor;

[0035] 141 third motor controller;

[0036] 151 Third motor. DETAILED DESCRIPTION

[0037] In the following description, a large number of specific details are provided to provide a more thorough understanding of the present application. However, it is apparent to those skilled in the art that the present application can be implemented without one or more of these details. In other examples, in order to avoid confusion with the present application, some technical features well known in the art are not described.

[0038] It should be understood that the present application can be implemented in different forms and should not be construed as being limited to the embodiments presented herein. On the contrary, providing these embodiments will make the disclosure thorough and complete and fully convey the scope of the present application to those skilled in the art. In the accompanying drawings, the sizes and relative sizes of layers and regions may be exaggerated for clarity. The same reference numerals throughout represent the same elements.

[0039] It should be understood that when an element or layer is referred to as "on ...", "adjacent to ...", "connected to" or "coupled to" other elements or layers, it can be directly on, adjacent to, connected to or coupled to other elements or layers, or there can be intervening elements or layers. On the contrary, when an element is referred to as "directly on ...", "directly adjacent to ...", "directly connected to" or "directly coupled to" other elements or layers, there are no intervening elements or layers. It should be understood that although the terms first, second, third, etc. can be used to describe various elements, components, regions, layers and / or parts, these elements, components, regions, layers and / or parts should not be limited by these terms. These terms are only used to distinguish one element, component, region, layer or part from another element, component, region, layer or part. Therefore, without departing from the teachings of the present application, the first element, component, region, layer or part discussed below can be represented as a second element, component, region, layer or part.

[0040] Spatially relative terms such as "under," "below," "below," "under," "above," "above," etc., may be used herein for ease of description to describe the relationship of an element or feature shown in the figures to other elements or features. It should be understood that in addition to the orientations shown in the figures, the spatially relative terms are intended to include different orientations of the device in use and operation. For example, if the device in the accompanying drawings is flipped, then the elements or features described as "under other elements" or "under" or "under" will be oriented as "on" the other elements or features. Therefore, the exemplary terms "under" and "under" may include both upper and lower orientations. The device may be oriented otherwise (rotated 90 degrees or other orientations) and the spatial descriptors used herein are interpreted accordingly.

[0041] In the related technology, the increase of the voltage level of the electric control will lead to the increase of the cost of the power electronic components in the electric control, especially the four-wheel drive three-electric architecture has one more electric control compared to the two-wheel drive three-electric architecture, and the cost increase is more obvious. At the same time, with the increase of voltage level, the EMC (Electromagnetic Compatibility) problem of the motor is becoming more and more serious, and the loss of the motor is gradually increasing, further reducing the range of electric vehicles.

[0042] In order to solve at least one of the above problems, the present application provides a drive system, which includes: a power battery, including a plurality of battery cell groups connected in series; a motor controller group, including a plurality of motor controllers connected in series; a motor group, including a plurality of motors; wherein the motor controller group is connected in parallel to both ends of the power battery, and the series connection point between two adjacent motor controllers is connected to the series connection point between two corresponding adjacent battery cell groups; and the output end of each motor controller is connected to the input end of a corresponding motor.

[0043] According to the drive system and vehicle of the embodiment of the present application, by dividing the power battery into a plurality of battery cell groups connected in series, the motor controller group is connected in parallel to the two ends of the power battery, and the series connection point between two adjacent motor controllers is connected to the series connection point between the two corresponding adjacent battery cell groups, so that each motor controller is connected in parallel with only one battery cell group, compared with the method of directly connecting the motor controller in parallel to the two ends of the power battery, the voltage level of each motor controller can be effectively reduced, thereby reducing the cost of power electronic components in the motor controller. At the same time, with the reduction of the voltage level, the energy consumption of each motor can be reduced, so that each motor has a better EMC performance and improves the driving system's range.

[0044] In order to thoroughly understand the present application, a detailed structure will be presented in the following description to illustrate the technical solution proposed by the present application. The preferred embodiments of the present application are described in detail as follows, but in addition to these detailed descriptions, the present application may also have other implementation methods.

[0045] Reference below Figure 3 A drive system 100 according to an embodiment of the present application is described. The drive system 100 provided in the embodiment of the present application includes: a power battery, including a first battery cell group 111 and a second battery cell group 112 connected in series; a motor controller group, including a first motor controller 121 and a second motor controller 122 connected in series; a motor group, including a first motor 131 and a second motor 132; wherein the motor controller group is connected in parallel to both ends of the power battery, and the series connection point between the first motor controller 121 and the second motor controller 122 is connected to the series connection point between the first battery cell group 111 and the second battery cell group 112; and the output end of the first motor controller 121 is connected to the input end of the first motor 131, and the output end of the second motor controller 122 is connected to the input end of the second motor 132.

[0046] In this embodiment, the power battery is divided into a first battery group 111 and a second battery group 112 connected in series, the motor controller group is connected in parallel to both ends of the power battery, and the series connection point between the first motor controller 121 and the second motor controller 122 is connected to the series connection point between the first battery group 111 and the second battery group 112, so that the first motor controller 121 and the second motor controller 122 are respectively connected in parallel with only one battery group. Since the voltage of the first battery group 111 or the voltage of the second battery group 112 is lower than the voltage of the power battery as a whole, compared with the method of directly connecting the motor controller in parallel to both ends of the power battery, the voltage level of the first motor controller 121 and the second motor controller 122 can be effectively reduced, thereby reducing the cost of power electronic components in the motor controller. At the same time, with the reduction of the voltage level, the energy consumption of the first motor 131 and the second motor 132 can be reduced, so that the first motor 131 and the second motor 132 have better EMC performance, and improve the cruising range of the drive system 100.

[0047] It is understood that the number of cells in the first cell group 111 and the number of cells in the second cell group 112 may be the same or different, and this is not limited. When the voltage of the first cell group 111 is equal to the voltage of the second cell group 112, the series connection point between the first cell group 111 and the second cell group 112 is the potential midpoint of the power battery.

[0048] In some embodiments, Figure 3As shown, the first motor controller 121 is connected in parallel to both ends of the first battery cell group 111, and the second motor controller 122 is connected in parallel to both ends of the second battery cell group 112. Preferably, the first bus terminal of the first motor controller 121 is connected to the positive electrode of the first battery cell group 111, the second bus terminal of the first motor controller 121 and the first bus terminal of the second motor controller 122 are connected to the series connection point between the two, the negative electrode of the first battery cell group 111 and the positive electrode of the second battery cell group 112 are connected to the series connection point between the two, and the second bus terminal of the second motor controller 122 is connected to the negative electrode of the second battery cell group 112.

[0049] Among them, the classic four-wheel drive three-electric architecture has two motor controllers connected in parallel and each motor controller is connected in parallel to the two ends of the power battery. Therefore, when the power battery fails, the two motor controllers can no longer obtain electricity from the power battery, causing the two motor controllers and the motors connected to the motor controllers to fail to work normally, and the four-wheel drive three-electric architecture can no longer output power.

[0050] In this embodiment, by connecting the first motor controller 121 in parallel to the two ends of the first battery cell group 111, and the second motor controller 122 in parallel to the two ends of the second battery cell group 112, when the first battery cell group 111 fails, although the first battery cell group 111 can no longer continue to supply power to the first motor controller 121 and the first motor 131 connected to the first motor controller 121, the second battery cell group 112 that has not failed can still supply power to the second motor controller 122 and the second motor 132 connected to the second motor controller 122 normally, the second motor controller 122 can control the second motor 132 to operate normally, and the drive system 100 can still output power to maintain the minimum drive demand to the outside world. Alternatively, when the second battery cell group 112 fails, although the second battery cell group 112 can no longer continue to supply power to the second motor controller 122 and the second motor 132 connected to the first motor controller 121, the first battery cell group 111 that has not failed can still supply power to the first motor controller 121 and the first motor 131 connected to the first motor controller 121 normally, the first motor controller 121 can control the first motor 131 to operate normally, and the drive system 100 can still output power to maintain the minimum drive demand to the outside world.

[0051] Of course, the above is an example in which the first motor controller 121 is connected in parallel to both ends of the first battery cell group 111, and the second motor controller 122 is connected in parallel to both ends of the second battery cell group 112. It can be understood that in another implementation, the first motor controller 121 can be connected in parallel to both ends of the second battery cell group 112, and the second motor controller 122 can be connected in parallel to both ends of the first battery cell group 111. Similar to the above situation, in this implementation, when one of the battery cell groups fails, the other battery cell group that has not failed can still normally supply power to the corresponding motor controller and motor, and the drive system 100 can still output power. It should be noted that for the convenience of description, the following description is still based on the first motor controller 121 being connected in parallel to both ends of the first battery cell group 111, and the second motor controller 122 being connected in parallel to both ends of the second battery cell group 112.

[0052] In addition, the drive system 100 may further include a reminder. When a fault occurs in the first battery cell group 111 or the second battery cell group 112 , the reminder emits reminder information such as sound and light to remind the user, so that the user can repair the drive system 100 in time.

[0053] In some embodiments, Figure 4 As shown, the first motor controller 121 may include multiple bridge arm components connected in parallel between the positive and negative electrodes of the first battery cell group 111, each bridge arm component includes a first bridge group and a second bridge group connected in series, the drain of the first bridge group is connected to the positive electrode of the first battery cell group 111, the source of the first bridge group is connected to the drain of the second bridge group, the source of the second bridge group is connected to the negative electrode of the first battery cell group 111, and the series connection point of the first bridge group and the second bridge group in each bridge arm component is connected to a phase line of the first motor 131.

[0054] Similarly, the second motor controller 122 may also include a similar structure, which will not be described in detail.

[0055] Taking the example that both the first motor 131 and the second motor 132 are three-phase motors, the first motor 131 and the second motor 132 each include three windings, the first motor controller 121 and the second motor controller 122 each include three bridge arm components, the series points of the first bridge group and the second bridge group of the three bridge arm components in the first motor controller 121 are respectively connected to the three windings of the first motor 131, the series points of the first bridge group and the second bridge group of the three bridge arm components in the second motor controller 122 are respectively connected to the three windings of the second motor 132, and the three bridge arm components in the first motor controller 121 are respectively connected in series with the three bridge arm components in the second motor controller 122, that is, the first bridge arm component in the first motor controller 121 is connected in series with the first bridge arm component in the second motor controller 122, the second bridge arm component in the first motor controller 121 is connected in series with the second bridge arm component in the second motor controller 122, and the third bridge arm component in the first motor controller 121 is connected in series with the third bridge arm component in the second motor controller 122.

[0056] In order to further reduce the energy consumption of the drive system 100 while ensuring that the drive system 100 can normally provide large power, the present application may further limit the operation mode of the drive system 100.

[0057] In one example, when the driving power that the drive system 100 needs to output to the outside world is less than or equal to the first preset power, since the driving power that needs to be output to the outside world is small at this time, only one of the first motor 131 and the second motor 132 can be controlled to work, for example, only the first motor controller 121 controls the operation of the first motor 131, or only the second motor controller 122 controls the operation of the second motor 132, thereby reducing the energy consumption of the drive system 100. When the driving power that the drive system 100 needs to output to the outside world is greater than the first preset power, the driving power that needs to be output to the outside world is large, so it is necessary to control both the first motor 131 and the second motor 132 to work, that is, the first motor controller 121 controls the operation of the first motor 131, and the second motor controller 122 controls the operation of the second motor 132, so that the drive system 100 can provide greater power to the outside world.

[0058] Assuming that the driving power to be output to the outside is M0 and the first preset power is M1, the above process can be expressed as follows:

[0059] When M0<=M1, the first motor controller 121 controls the first motor 131 to operate, or the second motor controller 122 controls the second motor 132 to operate;

[0060] When M0>M1, the first motor controller 121 controls the first motor 131 to operate, and the second motor controller 122 controls the second motor 132 to operate.

[0061] It should be noted that there is no limitation on the magnitude relationship between the maximum driving power of the first motor 131 and the maximum driving power of the second motor 132 in the above process. The maximum driving power of the first motor 131 and the maximum driving power of the second motor 132 can be equal, for example, both are the first preset power; or the maximum driving power of the first motor 131 can be the first preset power, and the maximum driving power of the second motor 132 is greater than the first preset power; or the maximum driving power of the second motor 132 can be the first preset power, and the maximum driving power of the first motor 131 is greater than the first preset power.

[0062] In another example, taking the case where the maximum driving power of the second motor 132 is greater than the maximum driving power of the first motor 131 as an example, when the driving power that the drive system 100 needs to output to the outside is less than or equal to the first preset power, since the driving power that needs to be output to the outside is relatively small at this time, the first motor controller 121 can be used to control the operation of the first motor 131 only, thereby reducing the energy consumption of the drive system 100. When the driving power that the drive system 100 needs to output to the outside is greater than the first preset power and less than or equal to the second preset power, the driving power that needs to be output to the outside increases at this time. To avoid insufficient power output by the first motor 131, the second motor controller 122 can be used to control the operation of the second motor 132 with a larger maximum driving power, so as to ensure that the drive system 100 still has relatively low energy consumption while increasing the power output to the outside. When the driving power that the drive system 100 needs to output to the outside is greater than the second preset power, the driving power that needs to be output to the outside is relatively large at this time. Therefore, it is necessary to control both the first motor 131 and the second motor 132 to work, that is, to control the operation of the first motor 131 through the first motor controller 121 and control the operation of the second motor 132 through the second motor controller 122, so that the drive system 100 can provide a relatively large power to the outside.

[0063] Taking the driving power to be output to the outside as M0, the first preset power as M1, and the second preset power as M2, the above process can be expressed as follows:

[0064] When M0 <= M1, the first motor controller 121 controls the operation of the first motor 131;

[0065] When M1 < M0 <= M2, the second motor controller 122 controls the operation of the second motor 132;

[0066] When M0 > M2, the first motor controller 121 controls the operation of the first motor 131, and the second motor controller 122 controls the operation of the second motor 132.

[0067] The maximum driving power of the first motor 131 may be a first preset power, and the maximum driving power of the second motor 132 may be a second preset power.

[0068] Of course, the above example is based on the case where the maximum driving power of the second motor 132 is greater than the maximum driving power of the first motor 131. It can be understood that in another possibility, the maximum driving power of the first motor 131 may be greater than the maximum driving power of the second motor 132, which is similar to the above situation. In this possibility, when the driving power that the drive system 100 needs to output to the outside world is less than or equal to the first preset power, the second motor controller 122 controls the second motor 132 to operate; when the driving power that the drive system 100 needs to output to the outside world is greater than the first preset power and less than or equal to the second preset power, the first motor controller 121 controls the first motor 131 to operate; when the driving power that the drive system 100 needs to output to the outside world is greater than the second preset power, the first motor controller 121 controls the first motor 131 to operate, and the second motor controller 122 controls the second motor 132 to operate.

[0069] As can be seen from the above, the driving capabilities of the first motor controller 121 and the first motor 131 may not be consistent with the driving capabilities of the second motor controller 122 and the second motor 132. When the driving capabilities of the first motor controller 121 and the first motor 131 are inconsistent with the driving capabilities of the second motor controller 122 and the second motor 132, the power consumption capabilities of the first motor controller 121 and the first motor 131 are also inconsistent with the power consumption capabilities of the second motor controller 122 and the second motor 132, which may cause the power of the first battery group 111 to be unbalanced with the power of the second battery group 112.

[0070] In view of this, the present application further proposes a method for balancing the power of the first battery cell group 111 and the power of the second battery cell group 112 when the power of the first battery cell group 111 is inconsistent with the power of the second battery cell group 112 .

[0071] Taking the example that the power of the first battery cell group 111 is greater than the power of the second battery cell group 112, the first battery cell group 111 can transfer power to the second battery cell group 112 through the first motor controller 121 and the second motor controller 122. Specifically, in the first time period, the first motor controller 121 is in the first on state and the second motor controller 122 is in the off state, and the first battery cell group 111 discharges to the winding of the first motor 131 through the first motor controller 121; in the second time period, the first motor controller 121 is in the second on state and the second motor controller 122 is in the third on state, and the winding of the first motor 131 charges the winding of the second motor 132 through the first motor controller 121 and the second motor controller 122; in the third time period, the first motor controller 121 is in the off state and the second motor controller 122 is in the fourth on state, and the winding of the second motor 132 charges to the second battery cell group 112 through the second motor controller 122. Therefore, by controlling the on and off states of the first motor controller 121 and the second motor controller 122, part of the electric energy in the first battery cell group 111 can be transferred to the winding of the motor through the motor controller for temporary storage, and then the electric energy of the winding of the motor can be transferred to the second battery cell group 112 through the motor controller, so that the electric energy of the first battery cell group 111 is balanced with the electric energy of the second battery cell group 112.

[0072] Taking the three-phase motor as an example, the specific process can be referred to Figure 5A to Figure 5C .

[0073] First, in the first period of time, such as Figure 5A As shown, the first motor controller 121 is in the first on state and the second motor controller 122 is in the off state, that is, the first bridge group of the first bridge arm in the first motor controller 121 is on and the second bridge group is off, the first bridge group of the second bridge arm is off and the second bridge group is on, the first bridge group of the second bridge arm is off and the second bridge group is on, the first bridge group of the second bridge arm is off and the second bridge group is on, the first bridge group of the second bridge arm and the second bridge group of the three bridge arms in the second motor controller 122 are all off. Thus, the first battery cell group 111 can discharge the first winding and the second winding in the first motor 131 through the first bridge group of the first bridge arm in the first motor controller 121, and the discharge current charges the first winding and the second winding in the first motor 131, and then flows back to the negative electrode of the first battery cell group 111 through the second bridge group of the second bridge arm in the first motor controller 121. In this process, the first battery cell group 111 discharges the first motor 131, and the power of the first battery cell group 111 decreases.

[0074] Secondly, in the second time period, Figure 5BAs shown, the first motor controller 121 is in the second conduction state and the second motor controller 122 is in the third conduction state, that is, the first bridge group of the first bridge arm in the first motor controller 121 is turned off, the second bridge group is turned on, the first bridge group of the second bridge arm is turned off, the second bridge group is turned on, and the first bridge group and the second bridge group of the third bridge arm are both turned off, and the first bridge group of the first bridge arm in the second motor controller 122 is turned on, the second bridge group of the second bridge arm is turned on, the second bridge group is turned off, and the first bridge group and the second bridge group of the third bridge arm are both turned off. Thus, the first winding and the second winding of the first motor 131 can discharge the first winding and the second winding of the second motor 132 through the second bridge group of the second bridge arm in the first motor controller 121 and the first bridge group of the second bridge arm in the second motor controller 122, and transfer the electrical energy in the winding of the first motor 131 to the winding of the second motor 132.

[0075] Then in the third time period, Figure 5C As shown, the first motor controller 121 is in the off state and the second motor controller 122 is in the fourth on state, that is, the first bridge group and the second bridge group of the three bridge arms in the first motor controller 121 are both off, the first bridge group of the first bridge arm in the second motor controller 122 is on and the second bridge group is off, the first bridge group of the second bridge arm is off and the second bridge group is on, and the first bridge group and the second bridge group of the third bridge arm are both off. Thus, the electric energy stored in the first winding and the second winding of the second motor 132 can charge the second battery cell group 112 through the first bridge group of the first bridge arm in the second motor controller 122, so that the electric quantity of the second battery cell group 112 increases.

[0076] By sequentially executing the above-mentioned first time period, second time period and third time period, part of the electric energy in the first battery cell group 111 can be transferred to the second battery cell group 112 through the windings of the first motor 131 and the windings of the second motor 132, so that the power of the first battery cell group 111 decreases and the power of the second battery cell group 112 increases, and the power of the first battery cell group 111 is balanced with the power of the second battery cell group 112.

[0077] Taking the example that the power of the second battery cell group 112 is greater than the power of the first battery cell group 111, the second battery cell group 112 can transfer power to the first battery cell group 111 through the second motor controller 122 and the first motor controller 121. Specifically, in the first time period, the second motor controller 122 is in the fourth conduction state and the first motor controller 121 is in the off state, and the second battery cell group 112 discharges to the winding of the second motor 132 through the second motor controller 122; in the second time period, the second motor controller 122 is in the third conduction state and the first motor controller 121 is in the second conduction state, and the winding of the second motor 132 charges the winding of the first motor 131 through the second motor controller 122 and the first motor controller 121; in the third time period, the second motor controller 122 is in the off state and the first motor controller 121 is in the first conduction state, and the winding of the first motor 131 charges to the first battery cell group 111 through the first motor controller 121. Therefore, by controlling the on and off states of the first motor controller 121 and the second motor controller 122, part of the electric energy in the second battery cell group 112 can be transferred to the winding of the motor through the motor controller for temporary storage, and then the electric energy of the winding of the motor can be transferred to the first battery cell group 111 through the motor controller, so that the electric energy of the first battery cell group 111 is balanced with the electric energy of the second battery cell group 112.

[0078] Taking the three-phase motor as an example, the specific process can be referred to Figure 6A to Figure 6C .

[0079] First, in the first period of time, Fig. 6A As shown, the second motor controller 122 is in the fourth conduction state and the first motor controller 121 is in the off state, and the second battery core group 112 discharges to the winding of the second motor 132 through the second motor controller 122, that is, the first bridge group and the second bridge group of the three bridge arms in the first motor controller 121 are both turned off, the first bridge group of the first bridge arm in the second motor controller 122 is turned on, and the second bridge group is turned off, the first bridge group of the second bridge arm is turned off, and the second bridge group is turned on, and the first bridge group and the second bridge group of the third bridge arm are both turned off. Thus, the second battery core group 112 can discharge the first winding and the second winding in the second motor 132 through the first bridge group of the first bridge arm in the second motor controller 122, and the discharge current can charge the first winding and the second winding in the second motor 132, and then flow back to the negative electrode of the second battery core group 112 through the second bridge group of the second bridge arm in the second motor controller 122. In this process, the second battery core group 112 discharges the second motor 132, and the power of the second battery core group 112 decreases.

[0080] Secondly, in the second time period, Figure 6BAs shown, the second motor controller 122 is in the third conduction state and the first motor controller 121 is in the second conduction state, that is, the first bridge group of the first bridge arm in the first motor controller 121 is turned off, the second bridge group is turned on, the first bridge group of the second bridge arm is turned off, the second bridge group is turned on, and the first bridge group and the second bridge group of the third bridge arm are both turned off, and the first bridge group of the first bridge arm in the second motor controller 122 is turned on, the second bridge group of the second bridge arm is turned on, the second bridge group is turned off, and the first bridge group and the second bridge group of the third bridge arm are both turned off. Thus, the first winding and the second winding of the second motor 132 can discharge the first winding and the second winding of the first motor 131 through the first bridge group of the second bridge arm in the second motor controller 122 and the second bridge group of the second bridge arm in the first motor controller 121, and transfer the electrical energy in the winding of the second motor 132 to the winding of the first motor 131.

[0081] Then in the third time period, Figure 6C As shown, the second motor controller 122 is in the off state and the first motor controller 121 is in the first on state, that is, the first bridge group and the second bridge group of the three bridge arms in the second motor controller 122 are both off, the first bridge group of the first bridge arm in the first motor controller 121 is on and the second bridge group is off, the first bridge group of the second bridge arm is off and the second bridge group is on, and the first bridge group and the second bridge group of the third bridge arm are both off. Thus, the electric energy stored in the first winding and the second winding of the first motor 131 can be used to charge the first battery group 111 through the first bridge group of the first bridge arm in the first motor controller 121, so that the electric quantity of the first battery group 111 increases.

[0082] By sequentially executing the above-mentioned first time period, second time period and third time period, part of the electric energy in the second battery cell group 112 can be transferred to the first battery cell group 111 through the windings of the second motor 132 and the windings of the first motor 131, so that the power of the second battery cell group 112 decreases, the power of the first battery cell group 111 increases, and the power of the first battery cell group 111 is balanced with the power of the second battery cell group 112.

[0083] It should be noted that the process of achieving power balancing between the first battery cell group 111 and the second battery cell group 112 can be performed at any time when the vehicle is parking, driving or braking, and the compatible working conditions are very comprehensive.

[0084] In addition, there may be other situations that cause the power of the first battery cell group 111 and the power of the second battery cell group 112 to be unbalanced. For the imbalance caused by other situations, the above process can also be used to balance the power of the first battery cell group 111 and the power of the second battery cell group 112.

[0085] In some embodiments, Figure 7As shown, the drive system 100 may further include a third motor controller 141 and a third motor 151 . The third motor controller 141 is connected in parallel to both ends of the power battery, and the output end of the third motor controller 141 is connected to the input end of the third motor 151 .

[0086] Among them, when low-speed driving is required, the first motor controller 121 can be used to control the operation of the first motor 131, or the second motor controller 122 can be used to control the operation of the second motor 132, so as to achieve low-speed driving under the premise of low energy consumption, so that the drive system 100 has a high energy efficiency ratio; when high-speed driving is required, the third motor controller 141 can be used to control the operation of the third motor 151, so as to achieve high-speed driving under the premise of low energy consumption, so that the drive system 100 also has a high energy efficiency ratio.

[0087] It should be noted that the above is only an example in which the power battery includes a first battery cell group 111 and a second battery cell group 112 connected in series, the motor controller group includes a first motor controller 121 and a second motor controller 122 connected in series, and the motor group includes a first motor 131 and a second motor 132. It can be understood that the power battery can also include a larger number of battery cell groups connected in series, the motor controller group can also include a larger number of motor controllers connected in series, and the motor group can also include a larger number of motors, and this is not limited. It should also be pointed out that the number of battery cell groups and the number of motor controllers can be equal, and one battery cell group corresponds to one motor controller. In this case, the number of series connection points between battery cell groups in the power battery (referred to as battery cell group series connection points) is also consistent with the number of series connection points between motor controllers in the motor controller group (referred to as motor controller series connection points), and one battery cell group series connection point is correspondingly connected to one motor controller series connection point. Alternatively, the number of battery cell groups may not be equal to the number of motor controllers, the number of battery cell groups may be greater than the number of motor controllers, and one motor controller may correspond to multiple battery cell groups. In this case, the number of battery cell group series points in the power battery is greater than the number of motor controller series points in the motor controller group, and only some of the battery cell group series points are correspondingly connected to the motor controller series points. Alternatively, the number of battery cell groups may not be equal to the number of motor controllers, the number of battery cell groups may be less than the number of motor controllers, and one battery cell group may correspond to multiple motor controllers. In this case, the number of battery cell group series points in the power battery is less than the number of motor controller series points in the motor controller group, and some of the battery cell group series points may be correspondingly connected to multiple motor controller series points.

[0088] According to yet another aspect of the present application, a vehicle is provided. The vehicle includes a drive system.

[0089] Among them, the driving system can be implemented as the driving system 100 mentioned above, and reference can be made to the introduction above, which will not be repeated here.

[0090] In summary, according to the drive system and vehicle of the embodiment of the present application, by dividing the power battery into a plurality of battery cell groups connected in series, the motor controller group is connected in parallel to the two ends of the power battery, and the series connection point between two adjacent motor controllers is connected to the series connection point between the two corresponding adjacent battery cell groups, so that each motor controller is connected in parallel with only one battery cell group, compared with the method of directly connecting the motor controller in parallel to the two ends of the power battery, the voltage level of each motor controller can be effectively reduced, thereby reducing the cost of power electronic components in the motor controller. At the same time, as the voltage level is reduced, the energy consumption of each motor can be reduced, so that each motor has a better EMC performance, and the driving system's cruising range is improved.

[0091] Although example embodiments have been described herein with reference to the accompanying drawings, it should be understood that the above example embodiments are merely exemplary and are not intended to limit the scope of the present application to this. Those of ordinary skill in the art may make various changes and modifications therein without departing from the scope and spirit of the present application. All these changes and modifications are intended to be included within the scope of the present application as required by the appended claims.

[0092] Similarly, it should be understood that in order to streamline the present application and help understand one or more of the various application aspects, in the description of the exemplary embodiments of the present application, the various features of the present application are sometimes grouped together into a single embodiment, figure, or description thereof. However, the method of the present application should not be interpreted as reflecting the following intention: the claimed application requires more features than the features clearly stated in each claim. More specifically, as reflected in the corresponding claims, the application point is that the corresponding technical problem can be solved with less than all the features of a single disclosed embodiment. Therefore, the claims following the specific embodiment are hereby explicitly incorporated into the specific embodiment, wherein each claim itself serves as a separate embodiment of the present application.

[0093] In addition, those skilled in the art will appreciate that, although some embodiments described herein include certain features included in other embodiments but not other features, the combination of features of different embodiments is meant to be within the scope of the present application and form different embodiments. For example, in the claims, any one of the claimed embodiments can be used in any combination.

[0094] It should be noted that the above embodiments illustrate rather than limit the present application, and that those skilled in the art may devise alternative embodiments without departing from the scope of the appended claims. In the claims, any reference symbol between brackets should not be construed as a limitation to the claims. The use of the words first, second, and third, etc. does not indicate any order. These words may be interpreted as names.

Claims

1. A drive system, characterized in that: The drive system comprises: A power battery, comprising a plurality of battery cells connected in series; a motor controller group, comprising a plurality of motor controllers connected in series; A motor group, including a plurality of motors; Wherein, the motor controller group is connected in parallel to both ends of the power battery, and the series connection point between two adjacent motor controllers is connected to the series connection point between two corresponding adjacent battery cell groups; and The output end of each motor controller is connected to the input end of a corresponding motor.

2. The drive system according to claim 1, characterized in that: The plurality of battery cell groups include a first battery cell group and a second battery cell group connected in series, the plurality of motor controllers include a first motor controller and a second motor controller connected in series, and the plurality of motors include a first motor and a second motor. Among them, the series point between the first motor controller and the second motor controller is connected to the series point between the first battery cell group and the second battery cell group; and the output end of the first motor controller is connected to the input end of the first motor, and the output end of the second motor controller is connected to the input end of the second motor.

3. The drive system according to claim 2, characterized in that: The first motor controller is connected in parallel to two ends of the first battery cell group, and the second motor controller is connected in parallel to two ends of the second battery cell group.

4. The drive system according to claim 3, characterized in that: When the driving power that the driving system needs to output to the outside is less than or equal to a first preset power, the first motor controller controls the first motor to run, or the second motor controller controls the second motor to run; When the driving power that the driving system needs to output to the outside is greater than the first preset power, the first motor controller controls the operation of the first motor, and the second motor controller controls the operation of the second motor.

5. The drive system according to claim 3, characterized in that: When the driving power that the driving system needs to output to the outside is less than or equal to a first preset power, the first motor controller controls the first motor to operate; When the driving power that the driving system needs to output to the outside is greater than the first preset power and less than or equal to the second preset power, the second motor controller controls the second motor to operate; When the driving power that the driving system needs to output to the outside is greater than the second preset power, the first motor controller controls the first motor to operate, and the second motor controller controls the second motor to operate; The first preset power is smaller than the second preset power, and the maximum driving power of the second motor is larger than the maximum driving power of the first motor.

6. The drive system according to claim 3, characterized in that: When the first battery cell group is in a fault state, the second motor controller controls the second motor to operate; or When the second battery cell group is in a fault state, the first motor controller controls the first motor to operate.

7. The drive system according to claim 3, characterized in that: When the power of the first battery cell group is greater than the power of the second battery cell group, the first battery cell group transfers power to the second battery cell group through the first motor controller and the second motor controller.

8. The drive system according to claim 7, characterized in that: The first battery cell group transfers electricity to the second battery cell group through the first motor controller and the second motor controller, including: In a first time period, the first motor controller is in a first on state and the second motor controller is in an off state, and the first battery cell group discharges to the winding of the first motor through the first motor controller; In a second time period, the first motor controller is in a second conduction state and the second motor controller is in a third conduction state, and the winding of the first motor charges the winding of the second motor through the first motor controller and the second motor controller; In a third time period, the first motor controller is in an off state and the second motor controller is in a fourth on state, and the winding of the second motor charges the second battery cell group through the second motor controller.

9. The drive system according to claim 3, characterized in that: When the power of the second battery cell group is greater than the power of the first battery cell group, the second battery cell group transfers power to the first battery cell group through the second motor controller and the first motor controller.

10. The drive system according to claim 9, characterized in that The second battery cell group transfers electricity to the first battery cell group through the second motor controller and the first motor controller, including: In a first time period, the second motor controller is in a fourth on state and the first motor controller is in an off state, and the second battery cell group discharges to the winding of the second motor through the second motor controller; In a second time period, the second motor controller is in a third conduction state and the first motor controller is in a second conduction state, and the winding of the second motor charges the winding of the first motor through the second motor controller and the first motor controller; In a third time period, the second motor controller is in an off state and the first motor controller is in a first on state, and the winding of the first motor charges the first battery cell group through the first motor controller.

11. The drive system according to claim 2, characterized in that: The series connection point between the first battery cell group and the second battery cell group is the potential midpoint of the power battery.

12. The drive system according to claim 1, characterized in that: The drive system further includes a third motor controller and a third motor, The third motor controller is connected in parallel to two ends of the power battery, and the output end of the third motor controller is connected to the input end of the third motor.

13. A vehicle, characterized in that: The vehicle comprises the drive system according to any one of claims 1 to 12.

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