A battery pack, drive assembly, and vehicle

Abstract

This utility model discloses a battery pack, a drive assembly, and a vehicle, relating to the field of vehicle charging technology. The battery pack includes a switch assembly, which is electrically connected to a first external power source and a first battery inside the battery pack, and controls the charging of the first battery. The switch assembly is located inside the battery pack. Compared with related technologies where the switch assembly is independently located inside the vehicle, this utility model reduces the occupation of vehicle interior space resources by utilizing the idle space of the battery pack to set up the switch assembly.

Description

Technical Field

[0001] This utility model belongs to the field of vehicle charging technology, specifically relating to a battery pack, a drive assembly, and a vehicle. Background Technology

[0002] In a vehicle's charging circuit, a switching assembly is used to control the charging of the vehicle's battery.

[0003] In related technologies, the switch assembly is independently installed inside the vehicle, resulting in the switch assembly occupying interior space resources of the vehicle. Utility Model Content

[0004] This invention provides a battery pack, a drive assembly, and a vehicle, which at least solves the problem in related technologies where the switch assembly occupies the vehicle's interior space due to its independent placement inside the vehicle.

[0005] To solve the above-mentioned technical problems, this utility model is implemented as follows:

[0006] In a first aspect, embodiments of the present invention provide a battery pack, including: a switch assembly;

[0007] The switch assembly is disposed within the battery pack. The switch assembly is used to electrically connect to a first external power source and a first battery within the battery pack, respectively, and to control the charging of the first battery.

[0008] Optionally, the switch assembly is also used for electrical connection with the vehicle's motor.

[0009] Optionally, the battery pack further includes a control module; the control module is electrically connected to the switch assembly and is used to be electrically connected to the motor; wherein, the first external power source charges the first battery through the switch assembly, the control module, and the motor.

[0010] Optionally, the control module is located within the battery pack.

[0011] Optionally, the control module is a motor drive module.

[0012] Optionally, the switching assembly includes a first switching device, a second switching device, a third switching device, and a fourth switching device; a first end of the first switching device is electrically connected to a first end of the first external power supply, and a second end of the first switching device is electrically connected to a first end of the control module; a first end of the second switching device is electrically connected to the neutral point of the motor, and a second end of the second switching device is electrically connected to a first end of the first battery; a first end of the third switching device is electrically connected to a second end of the first external power supply, and a second end of the third switching device is electrically connected to a second end of the first battery; a first end of the fourth switching device is electrically connected to a second end of the third switching device, and a second end of the fourth switching device is electrically connected to a second end of the first battery.

[0013] Optionally, the switching assembly includes a third switching device, a fourth switching device, a fifth switching device, and a sixth switching device; the first end of the third switching device is electrically connected to the second end of the first external power supply, and the second end of the third switching device is electrically connected to the second end of the first battery; the first end of the fourth switching device is electrically connected to the second end of the third switching device, and the second end of the fourth switching device is electrically connected to the second end of the first battery; the first end of the fifth switching device is electrically connected to the first end of the first external power supply, and the second end of the fifth switching device is electrically connected to the neutral point of the motor; the first end of the sixth switching device is electrically connected to the first end of the control module, and the second end of the sixth switching device is electrically connected to the first end of the first battery.

[0014] Optionally, the battery pack further includes a charging module; the charging module is electrically connected to the switching assembly and the control module respectively, and the charging module is used to electrically connect to a second external power source and a second battery of the vehicle respectively; wherein, the second external power source charges the first battery through the charging module, the motor and the control module; and the first battery charges the second battery through the charging module.

[0015] Optionally, the charging module includes an on-board charger; the on-board charger is electrically connected to the switching assembly and the control module respectively, and the on-board charger is used to electrically connect to the second external power source; wherein, the second external power source charges the first battery through the on-board charger, the motor and the control module.

[0016] Optionally, the charging module includes a voltage converter; the voltage converter is electrically connected to the switching assembly and is used to electrically connect to the second battery; wherein the first battery charges the second battery through the voltage converter.

[0017] Optionally, the voltage of the first battery is greater than the voltage of the second battery.

[0018] Optionally, the second external power source is an AC power source.

[0019] Optionally, the charging module is disposed within the battery pack.

[0020] Optionally, the first external power source is a DC power source.

[0021] Optionally, the switching assembly is further configured to be electrically connected to a load; wherein the first battery supplies power to the load through the switching assembly.

[0022] Secondly, embodiments of the present invention also provide a battery pack, including the battery pack described in the first aspect.

[0023] Thirdly, embodiments of the present invention also provide a vehicle including a battery pack as described in the first aspect, or a drive assembly as described in the second aspect.

[0024] In this embodiment of the invention, the switch assembly is electrically connected to the first external power source and the first battery in the battery pack, and controls the charging of the first battery. The switch assembly is located inside the battery pack. Compared with the related technologies where the switch assembly is independently located inside the vehicle, this invention reduces the occupation of vehicle interior space resources by utilizing the idle space of the battery pack to set up the switch assembly. Attached Figure Description

[0025] To more clearly illustrate the technical solutions of the embodiments of this utility model, the drawings used in the description of the embodiments of this utility model will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this utility model. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0026] Figure 1 This is a schematic diagram of the structure of a battery pack provided in an embodiment of the present utility model;

[0027] Figure 2 This is a schematic diagram of another battery pack provided in an embodiment of the present utility model;

[0028] Figure 3 A schematic diagram of the specific structure of a battery pack provided in an embodiment of this utility model;

[0029] Figure 4 This is a schematic diagram of the structure of another battery pack provided in an embodiment of the present utility model;

[0030] Figure 5This is a schematic diagram of yet another battery pack provided in an embodiment of the present utility model;

[0031] Figure 6 This is a schematic diagram of the specific structure of another battery pack provided in an embodiment of the present utility model;

[0032] Figure 7 This is a schematic diagram of the structure of a charging module provided in an embodiment of the present utility model.

[0033] Figure label:

[0034] 10-Switch assembly; 20-Control module; 21-Bridge arm; 30-Charging module; 31-On-board charger; 32-Voltage converter; 40-Battery pack; 41-First battery; 50-Second battery; 60-Motor; 70-First external power supply; 80-Second external power supply; K1-First switching device; K2-Second switching device; K3-Third switching device; K4-Fourth switching device; K5-Fifth switching device; K6-Sixth switching device; M1-Motor drive system; Q1-First power device; Q2-Second power device; C1-Capacitor; L1-Winding. Detailed Implementation

[0035] To make the above-mentioned objectives, features and advantages of this utility model more apparent and understandable, the utility model will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0036] Reference Figure 1 This utility model provides a battery pack, including: a switch assembly 10; the switch assembly 10 is disposed in the battery pack 40, and the switch assembly 10 is used to electrically connect to a first external power source 70 and a first battery 41 in the battery pack 40 respectively, and to control the charging of the first battery 41.

[0037] In some embodiments, the switch assembly 10 is also used for electrical connection with the vehicle's motor 60.

[0038] In some embodiments, the battery pack 40 further includes a control module 20; the control module 20 is electrically connected to the switch assembly 10 and is used to be electrically connected to the motor; wherein, the first external power supply 70 charges the first battery 41 through the switch assembly 10, the control module 20 and the motor 60.

[0039] In some embodiments, the control module 20 is a motor drive module, that is, the control module 20 reuses the motor drive module in the motor drive system M1.

[0040] In some embodiments, the first battery 41 is a high-voltage battery (e.g., 800 volts), such as a power battery that provides power for the vehicle to move.

[0041] In some embodiments, the first external power source 70 is a charging pile, for example, the first external power source 70 is a DC charging pile.

[0042] In some embodiments, the first external power supply 70 boosts or bucks the first battery 41 via the switching assembly 10, the control module 20, and the motor 60.

[0043] In this embodiment of the present invention, the switch assembly 10 is electrically connected to the first external power source 70 and the first battery 41 in the battery pack 40, and controls the charging of the first battery 41. The switch assembly 10 is disposed in the battery pack 40. Compared with the related technologies in which the switch assembly is independently disposed in the interior of the vehicle, the present invention reduces the occupation of interior space resources by using the idle space of the battery pack 40 to set the switch assembly 10.

[0044] Optionally, in some embodiments, the switching assembly 10 includes a first switching device K1; a first end of the first switching device K1 is electrically connected to a first end of the first external power supply 70, and a second end of the first switching device K1 is electrically connected to a first end of the control module 20.

[0045] In some embodiments, the control terminal of the first switching device K1 is connected to the vehicle's controller, which controls the first switching device K1 to be turned on or off.

[0046] In some embodiments, the first terminal of the first external power supply 70 is the positive terminal of the first external power supply 70.

[0047] In some embodiments, the first switching device K1 may be a contactor, a relay, or other types of switching devices.

[0048] In this embodiment of the present invention, when the first switching device K1 is turned on, the first end of the first external power supply 70 is connected to the first end of the control module 20; when the first switching device K1 is turned off, the first end of the first external power supply 70 is disconnected from the first end of the control module 20.

[0049] Optionally, in some embodiments, the switching assembly 10 includes a second switching device K2; a first end of the second switching device K2 is electrically connected to the neutral point of the motor 60, and a second end of the second switching device K2 is electrically connected to the first end of the first battery 41.

[0050] In some embodiments, the control terminal of the second switching device K2 is connected to the vehicle's controller, which controls the second switching device K2 to be turned on or off.

[0051] In some embodiments, the first end of the first battery 41 is the positive electrode of the first battery 41.

[0052] In some embodiments, the second switching device K2 may be a contactor, a relay, or other types of switching devices.

[0053] In this embodiment of the invention, when the second switching device K2 is turned on, the neutral point of the motor 60 is connected to the first end of the first battery 41; when the second switching device K2 is turned off, the neutral point of the motor 60 is disconnected from the first end of the first battery 41.

[0054] Optionally, in some embodiments, the switching assembly 10 includes a third switching device K3; the first end of the third switching device K3 is electrically connected to the second end of the first external power supply 70, and the second end of the third switching device K3 is electrically connected to the second end of the first battery 41.

[0055] In some embodiments, the control terminal of the third switching device K3 is connected to the vehicle's controller, which controls the third switching device K3 to be turned on or off.

[0056] In some embodiments, the second end of the first battery 41 is the negative electrode of the first battery 41.

[0057] In some embodiments, the second terminal of the first external power supply 70 is the negative terminal of the first external power supply 70.

[0058] In some embodiments, the third switching device K3 may be a contactor, a relay, or other types of switching devices.

[0059] In this embodiment of the invention, when the third switching device K3 is turned on, the second end of the first battery 41 is connected to the second end of the first external power supply 70; when the third switching device K3 is turned off, the second end of the first battery 41 is disconnected from the second end of the first external power supply 70.

[0060] Optionally, in some embodiments, the switch assembly 10 further includes a fourth switch device K4; the first end of the fourth switch device K4 is electrically connected to the second end of the third switch device K3, and the second end of the fourth switch device K4 is electrically connected to the second end of the first battery 41.

[0061] In some embodiments, the control terminal of the fourth switching device K4 is connected to the vehicle's controller, which controls the fourth switching device K4 to be turned on or off.

[0062] In some embodiments, the fourth switching device K4 may be a contactor, relay or other type of switching device.

[0063] In this embodiment of the invention, when the fourth switching device K4 is turned on, the second end of the third switching device K3 is connected to the second end of the first battery 41; when the fourth switching device K4 is turned off, the second end of the third switching device K3 is disconnected from the second end of the first battery 41.

[0064] Optionally, in some embodiments, the switching assembly 10 includes a fifth switching device K5; the first end of the fifth switching device K5 is electrically connected to the first end of the first external power supply 70, and the second end of the fifth switching device K5 is electrically connected to the neutral point of the motor 60.

[0065] In some embodiments, the control terminal of the fifth switching device K5 is connected to the vehicle's controller, which controls the fifth switching device K5 to be turned on or off.

[0066] In some embodiments, the fifth switching device K5 may be a contactor, relay, or other type of switching device.

[0067] In this embodiment of the invention, when the fifth switching device K5 is turned on, the first terminal of the first external power supply 70 is connected to the neutral point of the motor 60; when the fifth switching device K5 is turned off, the first terminal of the first external power supply 70 is disconnected from the neutral point of the motor 60.

[0068] Optionally, in some embodiments, the switch assembly 10 further includes a sixth switch device K6; the first end of the sixth switch device K6 is electrically connected to the first end of the control module 20, and the second end of the sixth switch device K6 is electrically connected to the first end of the first battery 41.

[0069] In some embodiments, the control terminal of the sixth switching device K6 is connected to the vehicle's controller, which controls the sixth switching device K6 to be turned on or off.

[0070] In some embodiments, the type of the sixth switching device K6 includes a contactor, a relay, or other types of switching devices.

[0071] In this embodiment of the invention, when the sixth switching device K6 is turned on, the first end of the control module 20 is connected to the first end of the first battery 41; when the sixth switching device K6 is turned off, the first end of the control module 20 is disconnected from the first end of the first battery 41.

[0072] Optionally, refer to Figure 3In some embodiments, the motor 60 includes a multi-phase winding L1; the control module 20 includes a multi-phase bridge arm 21, the bridge arm 21 corresponding to the winding L1; the first end of each phase bridge arm 21 is electrically connected to the first end of the control module 20, and the second end of each phase bridge arm 21 is electrically connected to the second end of the control module 20; the midpoint of the bridge arm 21 is electrically connected to the first end of the winding L1 corresponding to the bridge arm 21; wherein, the first end of the control module 20 is electrically connected to the switching assembly 10.

[0073] In some embodiments, the second end of each phase winding L1 is electrically connected to the neutral point of the motor 60.

[0074] In some embodiments, the motor 60 includes a three-phase winding L1, and the control module 20 includes a three-phase bridge arm 21. The first end of each phase bridge arm 21 is electrically connected to the first end of the control module 20, and the second end of each phase bridge arm 21 is electrically connected to the second end of the control module 20. The midpoint of the first phase bridge arm 21 is electrically connected to the first end of the first phase winding L1, the midpoint of the second phase bridge arm 21 is electrically connected to the first end of the second phase winding L1, and the midpoint of the third phase bridge arm 21 is electrically connected to the first end of the third phase winding L1.

[0075] In this embodiment of the invention, when the bridge arm 21 is conducting, the winding L1 corresponding to the bridge arm 21 is charged or discharged.

[0076] Optionally, in some embodiments, each phase of the bridge arm 21 includes a first power device Q1 and a second power device Q2; a first end of the first power device Q1 is electrically connected to a first end of the control module 20, and a second end of the first power device Q1 is electrically connected to the midpoint of the bridge arm 21; a first end of the second power device Q2 is electrically connected to the midpoint of the bridge arm 21, and a second end of the second power device Q2 is electrically connected to the second end of the control module 20.

[0077] In some embodiments, the control terminal of the first power device Q1 is connected to the vehicle's controller, which controls the first power device Q1 to be turned on or off.

[0078] In some embodiments, the control terminal of the second power device Q2 is connected to the vehicle's controller, which controls the second power device Q2 to be turned on or off.

[0079] In some embodiments, the first power device Q1 may be of the type including an insulated gate bipolar transistor (IGBT), a silicon carbide (SiC) power switch, etc.

[0080] In some embodiments, the type of the second power device Q2 includes an insulated gate bipolar transistor, a silicon carbide power switch, etc.

[0081] In this embodiment of the present invention, when the first power device Q1 is turned on, the first end of the control module 20 is connected to the midpoint of the bridge arm 21; when the first power device Q1 is turned off, the first end of the control module 20 is disconnected from the midpoint of the bridge arm 21.

[0082] When the second power device Q2 is turned on, the second end of the control module 20 is connected to the midpoint of the bridge arm 21; when the second power device Q2 is turned off, the second end of the control module 20 is disconnected from the midpoint of the bridge arm 21.

[0083] Optionally, in some embodiments, the control module 20 further includes a capacitor C1; the first end of the capacitor C1 is electrically connected to the first end of the control module 20, and the second end of the capacitor C1 is electrically connected to the second end of the control module 20.

[0084] In this embodiment of the invention, capacitor C1 is used for voltage stabilization and filtering.

[0085] Optionally, in some embodiments, the battery pack further includes a charging module 30; the charging module 30 is electrically connected to the switch assembly 10 and the control module 20 respectively, and the charging module 30 is used to electrically connect to a second external power source 80 and a second battery 50 of the vehicle respectively; wherein, the second external power source 80 charges the first battery 41 through the charging module 30, the motor 60 and the control module 20; the first battery 41 charges the second battery 50 through the charging module 30.

[0086] In this embodiment of the invention, the second external power source 80 charges the first battery 41 through the charging module 30, the motor 60 and the control module 20, and the first battery 41 charges the second battery 50 through the charging module 30, thereby realizing the charging of the vehicle.

[0087] Optionally, refer to Figure 7 In some embodiments, the charging module 30 includes an on-board charger 31; the on-board charger 31 is electrically connected to the switch assembly 10 and the control module 20 respectively, and the on-board charger 31 is used to be electrically connected to the second external power source 80; wherein the second external power source 80 charges the first battery 41 through the on-board charger 31, the motor 60 and the control module 20.

[0088] In some embodiments, the on-board charger 31 (OBC) is used to convert the AC power from the second external power source 80 into high-voltage DC power to charge the first battery 41.

[0089] In this embodiment of the invention, the second external power source 80 charges the first battery 41 through the on-board charger 31, the motor 60 and the control module 20 to charge the vehicle.

[0090] Optionally, in some embodiments, the charging module 30 includes a voltage converter 32; the voltage converter 32 is electrically connected to the switching assembly 10, and the voltage converter 32 is used to electrically connect to the second battery 50; wherein the first battery 41 charges the second battery 50 through the voltage converter 32.

[0091] In some embodiments, voltage converter 32 is a direct current-direct current converter (DCDC).

[0092] In some embodiments, the voltage converter 32 is used to convert the voltage of the first battery 41 into the voltage of the first battery 41.

[0093] In this embodiment of the invention, the first battery 41 charges the second battery 50 via a voltage converter 32 to achieve vehicle charging.

[0094] Optionally, in some embodiments, the voltage of the first battery 41 is greater than the voltage of the second battery 50.

[0095] In some embodiments, the first battery 41 is a power battery, and the second battery 50 is a low-voltage storage battery.

[0096] In some embodiments, the first battery 41 is used to power high-voltage electrical components such as the vehicle's motor 60 and air conditioner; the second battery 50 is used to power low-voltage electrical components such as the vehicle's lighting components, windshield wipers, and audio system.

[0097] In this embodiment of the invention, the first battery 41 is a high-voltage battery, and the second battery 50 is a low-voltage battery (e.g., 12 volts).

[0098] Optionally, in some embodiments, the second external power source 80 is an AC power source.

[0099] In some embodiments, the second external power source 80 is a charging station, for example, an AC charging station.

[0100] In this embodiment of the utility model, since the second external power supply 80 is an AC power supply, the second external power supply 80 can charge the first battery 41 through the on-board charger 31, the motor 60 and the control module 20.

[0101] Optionally, in some embodiments, the charging module 30 is disposed within the battery pack 40.

[0102] In this embodiment of the utility model, by placing the charging module 30 inside the battery pack 40, the idle space of the battery pack 40 is utilized, thereby reducing the occupation of space resources inside the vehicle.

[0103] Optionally, in some embodiments, the control module 20 is disposed within the battery pack 40.

[0104] In this embodiment of the utility model, by setting the control module 20 inside the battery pack 40, the idle space of the battery pack 40 is utilized, thereby reducing the occupation of vehicle interior space resources.

[0105] Optionally, in some embodiments, the first external power source 70 is a DC power source.

[0106] In this embodiment of the utility model, since the first external power supply 70 is a DC power supply, the first external power supply 70 can charge the first battery 41 through the switch assembly 10, the control module 20 and the motor 60.

[0107] Optionally, in some embodiments, the switching assembly 10 is also used for electrical connection with a load; wherein the first battery 41 supplies power to the load through the switching assembly 10.

[0108] In some embodiments, the load includes electrical devices in the high-voltage domain such as motor 60, air conditioner, and positive temperature coefficient heater (PTC).

[0109] In some embodiments, the first end of the sixth switching device K6 is used to be electrically connected to the first end of the load, and the first end of the fourth switching device K4 is used to be electrically connected to the second end of the load.

[0110] In some embodiments, the first end of the load is the positive terminal of the load, and the second end of the load is the negative terminal of the load.

[0111] In this embodiment of the present invention, the first battery 41 supplies power to the load through the switching assembly 10, so as to realize the external power supply of the first battery 41.

[0112] Reference Figure 2In some embodiments, the switch assembly 10 is electrically connected to the vehicle's motor drive system M1, which is located outside the battery pack 40. The motor drive system M1 includes a control module 20 and a motor 60. The battery pack reuses the motor drive module in the motor drive system M1. The switch assembly 10 includes a first switch device K1, a second switch device K2, a third switch device K3, a fourth switch device K4, a fifth switch device K5, and a sixth switch device K6. The first external power supply 70 provides boost or buck charging to the first battery 41 through the switch assembly 10, the control module 20, and the motor 60. This is suitable for vehicles that support high-voltage charging (e.g., 800 volts). The charging pile supports high-voltage charging.

[0113] Reference Figure 4 In some embodiments, both the switch assembly 10 and the control module 20 are located within the battery pack 40. The switch assembly 10 includes a first switch device K1, a second switch device K2, a third switch device K3, a fourth switch device K4, and a sixth switch device K6. The first external power supply 70 performs step-down charging of the first battery 41 through the switch assembly 10, the control module 20, and the motor 60, which is suitable for vehicles that do not require high-voltage charging (e.g., 500 volts to 750 volts). The charging pile supports high-voltage charging.

[0114] In some embodiments, the switching assembly 10 includes a first switching device K1, a second switching device K2, a third switching device K3, and a fourth switching device K4; a first end of the first switching device K1 is electrically connected to a first end of the first external power supply 70, and a second end of the first switching device K1 is electrically connected to a first end of the control module 20; a first end of the second switching device K2 is electrically connected to the neutral point of the motor 60, and a second end of the second switching device K2 is electrically connected to a first end of the first battery 41; a first end of the third switching device K3 is electrically connected to a second end of the first external power supply 70, and a second end of the third switching device K3 is electrically connected to a second end of the first battery 41; a first end of the fourth switching device K4 is electrically connected to a second end of the third switching device K3, and a second end of the fourth switching device K4 is electrically connected to a second end of the first battery 41.

[0115] Reference Figure 5In some embodiments, the switch assembly 10 is electrically connected to the vehicle's motor drive system M1, which is located outside the battery pack 40. The motor drive system M1 includes a control module 20 and a motor 60. The battery pack reuses the control module 20 in the motor drive system M1. The switch assembly 10 includes a first switch device K1, a second switch device K2, a third switch device K3, a fourth switch device K4, and a sixth switch device K6. The first external power supply 70 performs step-down charging of the first battery 41 through the switch assembly 10, the control module 20, and the motor 60, which is suitable for vehicles that do not use high-voltage charging. The charging pile supports high-voltage charging.

[0116] Reference Figure 6 In some embodiments, the battery pack includes a switching assembly 10, a control module 20, and a charging module 30; the switching assembly 10 includes a first switching device K1, a second switching device K2, a third switching device K3, a fourth switching device K4, and a sixth switching device K6; the motor 60 includes a multi-phase winding L1; the control module 20 includes a multi-phase bridge arm 21 and a capacitor C1, with the bridge arm 21 corresponding to the winding L1; each phase bridge arm 21 includes a first power device Q1 and a second power device Q2; the charging module 30 includes an on-board charger 31 and a voltage converter 32;

[0117] The first terminal of the first switching device K1 is electrically connected to the first terminal of the first external power supply 70, and the second terminal of the first switching device K1 is electrically connected to the first terminal of the control module 20; the first terminal of the second switching device K2 is electrically connected to the neutral point of the motor 60, and the second terminal of the second switching device K2 is electrically connected to the first terminal of the first battery 41; the first terminal of the third switching device K3 is electrically connected to the second terminal of the first external power supply 70, and the second terminal of the third switching device K3 is electrically connected to the second terminal of the first battery 41; the first terminal of the fourth switching device K4 is electrically connected to the second terminal of the third switching device K3, and the second terminal of the fourth switching device K4 is electrically connected to the second terminal of the first battery 41; the first terminal of the sixth switching device K6 is electrically connected to the first terminal of the control module 20, and the second terminal of the sixth switching device K6 is electrically connected to the first terminal of the first battery 41; the neutral point of the motor 60 is electrically connected to the second terminal of each phase winding L1;

[0118] The first end of each phase bridge arm 21 is electrically connected to the first end of the control module 20, and the second end of each phase bridge arm 21 is electrically connected to the second end of the control module 20; the midpoint of the bridge arm 21 is electrically connected to the first end of the winding L1 corresponding to the bridge arm 21; the second end of the control module 20 is electrically connected to the second end of the third switching device K3 and the first end of the fourth switching device K4, respectively; the first end of the first power device Q1 is electrically connected to the first end of the control module 20, and the second end of the first power device Q1 is electrically connected to the midpoint of the bridge arm 21; the first end of the second power device Q2 is electrically connected to the midpoint of the bridge arm 21, and the second end of the second power device Q2 is electrically connected to the second end of the control module 20; the first end of the capacitor C1 is electrically connected to the first end of the control module 20, and the second end of the capacitor C1 is electrically connected to the second end of the control module 20.

[0119] The first output terminal of the on-board charger 31 is electrically connected to the first terminal of the sixth switching device K6 and the first terminal of the control module 20, respectively. The second output terminal of the on-board charger 31 is electrically connected to the first terminal of the fourth switching device K4 and the second terminal of the control module 20, respectively. The first input terminal of the on-board charger 31 is electrically connected to the first terminal of the second external power supply 80, and the second input terminal of the on-board charger 31 is electrically connected to the second terminal of the second external power supply 80. The first input terminal of the voltage converter 32 is electrically connected to the first terminal of the sixth switching device K6, and the second input terminal of the voltage converter 32 is electrically connected to the first terminal of the fourth switching device. The first output terminal of the voltage converter 32 is electrically connected to the first terminal of the second battery 50, and the second output terminal of the voltage converter 32 is electrically connected to the second terminal of the second battery 50.

[0120] Reference Figure 3 In some embodiments, the switching assembly 10 further includes a fifth switching device K5, the first end of which is electrically connected to the first end of the first external power supply 70, and the second end of which is electrically connected to the neutral point of the motor 60.

[0121] In some embodiments, the switching assembly 10 includes a third switching device K3, a fourth switching device K4, a fifth switching device K5, and a sixth switching device K6; the first end of the third switching device K3 is electrically connected to the second end of the first external power supply 70, and the second end of the third switching device K3 is electrically connected to the second end of the first battery 41; the first end of the fourth switching device K4 is electrically connected to the second end of the third switching device K3, and the second end of the fourth switching device K4 is electrically connected to the second end of the first battery 41; the first end of the fifth switching device K5 is electrically connected to the first end of the first external power supply 70, and the second end of the fifth switching device K5 is electrically connected to the neutral point of the motor 60; the first end of the sixth switching device K6 is electrically connected to the first end of the control module 20, and the second end of the sixth switching device K6 is electrically connected to the first end of the first battery 41.

[0122] In some embodiments, the switching assembly 10 includes a first switching device K1, a second switching device K2, a third switching device K3, a fourth switching device K4, a fifth switching device K5, and a sixth switching device K6. During the first time period when the first external power supply 70 is charging the first battery 41 at a reduced voltage, the first switching device K1, the second switching device K2, the third switching device K3, the fourth switching device K4, and the first power device Q1 are all turned on, while the fifth switching device K5, the sixth switching device K6, and the second power device Q2 are all turned off. The first external power supply 70 charges the winding L1 and the first battery 41. Due to the voltage division effect of the winding L1, the first battery 41... The charging voltage of battery 41 is lower than the voltage of the first external power supply 70. During the second time period when the first external power supply 70 is charging the first battery 41 at a reduced voltage, the second switching device K2 and the fourth switching device K4 are both turned on, while the first switching device K1, the third switching device K3, the fifth switching device K5, the sixth switching device K6, the first power device Q1, and the second power device Q2 are all turned off. The winding L1 discharges to charge the first battery 41. The charging current passes through the parasitic diode of the second power device Q2. Because the voltage of the winding L1 is lower than the voltage of the first external power supply 70, the charging voltage of the first battery 41 is also lower than the voltage of the first external power supply 70. Therefore, when the charging voltage of the first battery 41 is lower than the voltage of the first external power supply 70, the solution of this embodiment of the invention can achieve step-down charging of the battery pack 40.

[0123] In some embodiments, the switching assembly 10 includes a first switching device K1, a second switching device K2, a third switching device K3, a fourth switching device K4, a fifth switching device K5, and a sixth switching device K6; during a first time period when the first external power supply 70 is boost-charging the first battery 41, the fifth switching device K5, the third switching device K3, and the second power device Q2 are all turned on, while the first switching device K1, the second switching device K2, the fourth switching device K4, the sixth switching device K6, and the first power device Q1 are all turned off, and the first external power supply 70 is charging the winding L1; during a second time period when the first external power supply 70 is boost-charging the first battery 41... The fifth switching device K5, the sixth switching device K6, the third switching device K3, and the fourth switching device K4 are all turned on, while the first switching device K1, the second switching device K2, the first power device Q1, and the second power device Q2 are all turned off. The winding L1 discharges, and the first external power supply 70 and the winding L1 together charge the first battery 41. The charging current passes through the parasitic diode of the first power device Q1. Since the charging voltage of the first battery 41 is equal to the sum of the voltage of the first external power supply 70 and the voltage of the winding L1, the charging voltage of the first battery 41 is greater than the voltage of the first external power supply 70, thus enabling the first external power supply 70 to boost the charging voltage of the first battery 41. Therefore, when the charging voltage of the first battery 41 is higher than the voltage of the first external power supply 70, the solution of this embodiment can achieve boost charging of the battery pack 40.

[0124] In some embodiments, the switching assembly 10 includes a first switching device K1, a second switching device K2, a third switching device K3, and a fourth switching device K4. During the first time period when the first external power supply 70 is charging the first battery 41 at a reduced voltage, the first switching device K1, the second switching device K2, the third switching device K3, the fourth switching device K4, and the first power device Q1 are all turned on, while the second power device Q2 is turned off. The first external power supply 70 charges the winding L1 and the first battery 41. Due to the voltage division effect of the winding L1, the charging voltage of the first battery 41 is low. During the second time period when the first external power supply 70 is charging the first battery 41 at a reduced voltage, the second switching device K2 and the fourth switching device K4 are both turned on, while the first switching device K1, the third switching device K3, the first power device Q1, and the second power device Q2 are all turned off. The winding L1 discharges to charge the first battery 41. The charging current passes through the parasitic diode of the second power device Q2. Because the voltage of the winding L1 is lower than the voltage of the first external power supply 70, the charging voltage of the first battery 41 is lower than the voltage of the first external power supply 70. Therefore, when the charging voltage of the first battery 41 is lower than the voltage of the first external power supply 70, the solution of this embodiment can achieve reduced-voltage charging of the battery pack 40.

[0125] In some embodiments, the switching assembly 10 includes a third switching device K3, a fourth switching device K4, a fifth switching device K5, and a sixth switching device K6; during a first time period when the first external power supply 70 is boost-charging the first battery 41, the fifth switching device K5, the third switching device K3, and the second power device Q2 are all turned on, while the fourth switching device K4, the sixth switching device K6, and the first power device Q1 are all turned off, and the first external power supply 70 is charging the winding L1; during a second time period when the first external power supply 70 is boost-charging the first battery 41, the fifth switching device K5, The sixth switching device K6, the third switching device K3, and the fourth switching device K4 are all turned on, while the first power device Q1 and the second power device Q2 are both turned off. Winding L1 discharges, and the first external power supply 70 and winding L1 together charge the first battery 41. The charging current passes through the parasitic diode of the first power device Q1. Since the charging voltage of the first battery 41 is equal to the sum of the voltage of the first external power supply 70 and the voltage of winding L1, the charging voltage of the first battery 41 is greater than the voltage of the first external power supply 70, thus enabling the first external power supply 70 to boost the charging voltage of the first battery 41. Therefore, when the charging voltage of the first battery 41 is higher than the voltage of the first external power supply 70, the solution of this embodiment can achieve boost charging of the battery pack 40.

[0126] In some embodiments, during the first period when the second external power supply 80 is stepping down to charge the first battery 41, the on-board charger 31 converts the AC power from the second external power supply 80 into high-voltage DC power. The second switching device K2, the fourth switching device K4, and the first power device Q1 are all turned on, while the first switching device K1, the third switching device K3, the fifth switching device K5, the sixth switching device K6, and the second power device Q2 are all turned off. The second external power supply 80 charges the winding L1 and the first battery 41. Due to the voltage division effect of the winding L1, the charging voltage of the first battery 41 is lower than the voltage of the first external power supply 70. During the second period of step-down charging of the first battery 41, the on-board charger 31 stops converting the AC power from the second external power supply 80 into high-voltage DC power. The second switching device K2 and the fourth switching device K4 are both turned on, while the first switching device K1, the third switching device K3, the fifth switching device K5, the sixth switching device K6, the first power device Q1, and the second power device Q2 are all turned off. The winding L1 discharges to charge the first battery 41. The charging current passes through the parasitic diode of the second power device Q2. Since the voltage of the winding L1 is lower than the voltage of the first external power supply 70, the charging voltage of the first battery 41 is lower than the voltage of the first external power supply 70.

[0127] In some embodiments, the battery pack 40 is provided with a DC input interface, an AC input interface, and a low-voltage DC output interface. The first end of the DC input interface is electrically connected to the first end of the first switching device K1. The first end of the first external power supply 70 is electrically connected to the first end of the first switching device K1 by being electrically connected to the first end of the DC input interface. The second end of the DC input interface is electrically connected to the first end of the third switching device K3. The second end of the first external power supply 70 is electrically connected to the first end of the third switching device K3 by being electrically connected to the second end of the DC input interface.

[0128] The first end of the AC input interface is electrically connected to the first input end of the on-board charger 31. The first end of the second external power supply 80 is electrically connected to the first end of the AC input interface to achieve the electrical connection between the first end of the second external power supply 80 and the first input end of the on-board charger 31. The second end of the AC input interface is electrically connected to the second input end of the on-board charger 31. The second end of the second external power supply 80 is electrically connected to the second end of the AC input interface to achieve the electrical connection between the second end of the second external power supply 80 and the second input end of the on-board charger 31.

[0129] The first end of the low-voltage DC output interface is electrically connected to the first output end of the voltage converter 32. The first end of the second battery 50 is electrically connected to the first end of the low-voltage DC output interface to achieve electrical connection between the first end of the second battery 50 and the first output end of the voltage converter 32. The second end of the low-voltage DC output interface is electrically connected to the second output end of the voltage converter 32. The second end of the second battery 50 is electrically connected to the second end of the low-voltage DC output interface to achieve electrical connection between the second end of the second battery 50 and the second output end of the voltage converter 32.

[0130] In some embodiments, the motor drive system M1 includes a control module 20 and a motor 60. The motor drive system M1 is located outside the battery pack 40, which also has a motor drive interface. The first end of the motor drive interface is electrically connected to the first end of the sixth switching device K6 and the second end of the first switching device K1. The first end of the control module 20 is electrically connected to the first end of the motor drive interface, thereby achieving the same connection between the first end of the control module 20 and the first end of the sixth switching device K6 and the second end of the first switching device K1. The second end of the motor drive interface is electrically connected to the first end of the fourth switching device K4 and the second end of the third switching device K3. The second end of the control module 20 is electrically connected to the second end of the motor drive interface, thereby achieving the same connection between the first end of the control module 20 and the first end of the fourth switching device K4 and the second end of the third switching device K3. The third end of the motor drive interface is electrically connected to the first end of the second switching device K2. The neutral point of the motor 60 is electrically connected to the third end of the motor drive interface, thereby achieving the same connection between the neutral point of the motor 60 and the first end of the second switching device K2.

[0131] In some embodiments, the third end of the motor drive interface is also electrically connected to the second end of the fifth switching device K5, and the neutral point of the motor 60 is electrically connected to the second end of the fifth switching device K5 by being electrically connected to the third end of the motor drive interface.

[0132] In some embodiments, the motor 60 includes an n-phase winding L1; the control module 20 includes an n-phase bridge arm 21, the control module 20 is disposed within the battery pack 40, the battery pack 40 is also provided with a motor 60 interface, the motor 60 interface includes n winding L1 ends and 1 neutral point end, the i-th winding L1 end is electrically connected to the midpoint of the i-th phase bridge arm 21, the first end of the i-th phase winding L1 is electrically connected to the i-th winding L1 end to realize the first end of the i-th phase winding L1 is electrically connected to the midpoint of the i-th phase bridge arm 21; the neutral point end is electrically connected to the first end of the second switching device K2, the neutral point of the motor 60 is electrically connected to the neutral point end to realize the neutral point of the motor 60 is electrically connected to the first end of the second switching device K2; wherein, n is a positive integer, and i is a positive integer less than or equal to n.

[0133] In some embodiments, the neutral point is also electrically connected to the second terminal of the fifth switching device K5, and the neutral point of the motor 60 is electrically connected to the second terminal of the fifth switching device K5 by being electrically connected to the neutral point.

[0134] In some embodiments, the battery pack 40 is further provided with a high-voltage load interface. The first end of the high-voltage load interface is electrically connected to the first end of the sixth switching device K6. The first end of the load is electrically connected to the first end of the sixth switching device K6 by being electrically connected to the first end of the high-voltage load interface. The second end of the high-voltage load interface is electrically connected to the first end of the fourth switching device K4. The second end of the load is electrically connected to the first end of the fourth switching device K4 by being electrically connected to the second end of the high-voltage load interface.

[0135] In some embodiments, the battery pack further includes a current detection module and a fuse. The current detection module is connected between the first battery 41 and the fourth switching device K4, or between the first battery 41 and the sixth switching device K6. The fuse is connected between the first battery 41 and the fourth switching device K4, or between the first battery 41 and the sixth switching device K6. The current detection module is used to connect to the vehicle's controller and detect the charging current of the first battery 41 so that the controller can control the fourth switching device K4 or the sixth switching device K6 to disconnect when the charging current of the first battery 41 is abnormal (e.g., the charging current of the first battery 41 is greater than or equal to a current threshold). The fuse is used to conduct when the charging current of the first battery 41 is less than the current threshold to maintain normal charging of the first battery 41, and to disconnect when the charging current of the first battery 41 is greater than or equal to the current threshold to avoid overcurrent damage to the first battery 41.

[0136] This utility model embodiment also provides a drive assembly, including a battery pack 40 as described in the first aspect.

[0137] In this embodiment of the invention, the drive assembly includes a battery pack 40 and a motor 60. The connection relationship between the battery pack 40 and the motor 60 in this drive assembly can be referred to the description in the preceding embodiments. The battery pack 40 can provide electrical energy to the motor 60, or it can reuse part of the structure of the motor 60 to charge the battery pack 40; this will not be elaborated further here. In actual installation, the positional relationship between the battery pack 40 and the motor 60 can be adjusted according to the specific structure of the vehicle to which it is installed; this embodiment of the invention does not limit this.

[0138] The specific implementation process of the battery pack 40 in the drive assembly is similar to that described above, and will not be repeated here.

[0139] This utility model embodiment also provides a vehicle including a battery pack 40 as described in the first aspect, or a drive assembly as described in the second aspect.

[0140] The specific implementation process of the battery pack 40 in the vehicle is similar to that described above, and will not be repeated here.

[0141] The utility model embodiment solves the problems that the upper limit of the output voltage of the first external power supply 70 is difficult to meet the charging requirements of the first battery 41, or that the output voltage of the first external power supply 70 is higher than the required voltage of the first battery 41, or that the upper limit of the output current of the first external power supply 70 is difficult to meet the charging requirements of the first battery 41. At the same time, the cost of the connection line is reduced by integrating the switch assembly 10, the control module 20 and the charging module 30 into the battery pack 40.

[0142] In summary, in this embodiment of the present invention, the switch assembly 10 is electrically connected to the first external power source 70 and the first battery 41 in the battery pack 40, and controls the charging of the first battery 41. Moreover, the switch assembly 10 is disposed in the battery pack 40. Compared with the related technologies in which the switch assembly is independently disposed in the interior of the vehicle, the present invention reduces the occupation of interior space resources by using the idle space of the battery pack 40 to set the switch assembly 10.

[0143] Finally, it should be noted that in this document, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the term "comprising" or any other variation thereof is intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device.

[0144] The above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

[0145] The above description is merely a specific embodiment of this utility model, but the protection scope of this utility model is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this utility model should be included within the protection scope of this utility model. Therefore, the protection scope of this utility model should be determined by the scope of the claims.

Claims

1. A battery pack (40) characterized by, include: Switch assembly (10); The switch assembly (10) is disposed in the battery pack (40). The switch assembly (10) is used to electrically connect to the first external power source (70) and the first battery (41) in the battery pack (40) respectively, and to control the charging of the first battery (41).

2. The battery pack (40) of claim 1, characterized in that, The switch assembly (10) is also used for electrical connection with the vehicle's motor (60).

3. The battery pack (40) of claim 2, characterized in that, The battery pack (40) also includes a control module (20); The control module (20) is electrically connected to the switch assembly (10), and the control module (20) is used to be electrically connected to the motor; The first external power source (70) charges the first battery (41) through the switch assembly (10), the control module (20) and the motor (60).

4. The battery pack (40) of claim 3, characterized in that, The control module (20) is located inside the battery pack (40).

5. The battery pack (40) of claim 3, wherein, The control module (20) is a motor drive module.

6. The battery pack (40) of claim 3, wherein, The switching assembly (10) includes a first switching device (K1), a second switching device (K2), a third switching device (K3), and a fourth switching device (K4). The first end of the first switching device (K1) is electrically connected to the first end of the first external power supply (70), and the second end of the first switching device (K1) is electrically connected to the first end of the control module (20). The first end of the second switching device (K2) is electrically connected to the neutral point of the motor (60), and the second end of the second switching device (K2) is electrically connected to the first end of the first battery (41). The first end of the third switching device (K3) is electrically connected to the second end of the first external power supply (70), and the second end of the third switching device (K3) is electrically connected to the second end of the first battery (41). The first end of the fourth switching device (K4) is electrically connected to the second end of the third switching device (K3), and the second end of the fourth switching device (K4) is electrically connected to the second end of the first battery (41).

7. The battery pack (40) according to claim 3, characterized in that, The switching assembly (10) includes a third switching device (K3), a fourth switching device (K4), a fifth switching device (K5), and a sixth switching device (K6). The first end of the third switching device (K3) is electrically connected to the second end of the first external power supply (70), and the second end of the third switching device (K3) is electrically connected to the second end of the first battery (41). The first end of the fourth switching device (K4) is electrically connected to the second end of the third switching device (K3), and the second end of the fourth switching device (K4) is electrically connected to the second end of the first battery (41). The first end of the fifth switching device (K5) is electrically connected to the first end of the first external power supply (70), and the second end of the fifth switching device (K5) is electrically connected to the neutral point of the motor (60). The first end of the sixth switching device (K6) is electrically connected to the first end of the control module (20), and the second end of the sixth switching device (K6) is electrically connected to the first end of the first battery (41).

8. The battery pack (40) according to claim 3, characterized in that, The battery pack also includes a charging module (30). The charging module (30) is electrically connected to the switch assembly (10) and the control module (20) respectively, and the charging module (30) is used to be electrically connected to the second external power source (80) and the second battery (50) of the vehicle respectively; The second external power source (80) charges the first battery (41) through the charging module (30), the motor (60) and the control module (20); the first battery (41) charges the second battery (50) through the charging module (30).

9. The battery pack (40) according to claim 8, characterized in that, The charging module (30) includes an on-board charger (31). The on-board charger (31) is electrically connected to the switch assembly (10) and the control module (20) respectively, and the on-board charger (31) is used to be electrically connected to the second external power supply (80); The second external power source (80) charges the first battery (41) through the on-board charger (31), the motor (60) and the control module (20).

10. The battery pack (40) according to claim 8, characterized in that, The charging module (30) includes a voltage converter (32); The voltage converter (32) is electrically connected to the switching assembly (10), and the voltage converter (32) is used to be electrically connected to the second battery (50); The first battery (41) charges the second battery (50) through the voltage converter (32).

11. The battery pack (40) according to claim 8, characterized in that, The voltage of the first battery (41) is greater than the voltage of the second battery (50).

12. The battery pack (40) according to claim 8, characterized in that, The second external power source (80) is an AC power source.

13. The battery pack (40) according to claim 8, characterized in that, The charging module (30) is disposed within the battery pack (40).

14. The battery pack (40) according to any one of claims 1 to 13, characterized in that, The first external power source (70) is a DC power source.

15. The battery pack (40) according to any one of claims 1 to 13, characterized in that, The switching assembly (10) is also used for electrical connection with a load; The first battery (41) supplies power to the load through the switching assembly (10).

16. A drive assembly, characterized in that, Includes the battery pack (40) as claimed in any one of claims 1 to 15.

17. A vehicle, characterized in that, It includes the battery pack (40) as claimed in any one of claims 1 to 15, or the drive assembly as claimed in claim 16.

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