A battery pack, a battery system, and a vehicle

Abstract

The application relates to a battery pack, a battery system and a vehicle, the battery pack comprising: a compressor driving module comprising a first-phase half-bridge, a second-phase half-bridge and a third-phase half-bridge; a first DC / DC converter comprising a first half-bridge and a second half-bridge; and a first battery, wherein the second half-bridge is connected with the first battery; wherein the upper bridge arm power switch device of the third-phase half-bridge and the upper bridge arm power switch device of the first half-bridge are the same power switch device Q1; and the lower bridge arm power switch device of the third-phase half-bridge and the lower bridge arm power switch device of the first half-bridge are the same power switch device Q2. Through the technical scheme, the same set of switch devices is reused, which serves as a power switch device in a bridge arm of a phase of the compressor driving module and also serves as a power switch device of a primary side of the DC / DC converter, so that the technical effect of improving the integration of the battery pack and effectively reducing the cost is achieved.

Description

Technical Field

[0001] This application relates to the field of electronic technology, and more particularly to a battery pack, battery system, and vehicle. Background Technology

[0002] The high cost of power battery systems has become one of the main bottlenecks restricting the widespread adoption of new energy vehicles. Reducing the cost of power battery systems is crucial for achieving large-scale application of new energy vehicles and promoting the sustainable transformation of transportation systems.

[0003] In traditional automotive battery systems, the various electronic control modules (such as compressors, DC / DC converters, and on-board chargers) are distributed relatively dispersedly throughout the vehicle. This dispersed layout results in long high-voltage wiring harnesses connecting the electronic control modules to the battery modules and between the various electronic control modules. This not only increases the development and maintenance costs of the entire vehicle but also wastes space and makes the assembly process time-consuming and labor-intensive. Although related technologies offer an integration solution for the compressor drive module and the DC / DC converter, this integration is merely a physical structural integration, resulting in low integration levels and difficulty in effectively reducing costs. Utility Model Content

[0004] This application provides a battery pack, a battery system, and a vehicle, which at least partially solves the problem of low integration and difficulty in effectively reducing costs in the compressor drive and DC / DC converter integration schemes in the related technologies.

[0005] To achieve the above objectives, according to a first aspect of this application, a battery pack is provided, comprising: The compressor drive module includes a first-phase half-bridge, a second-phase half-bridge, and a third-phase half-bridge; The first DC / DC converter includes a first half-bridge and a second half-bridge; The first battery is connected to the second half-bridge. Wherein, the upper arm power switch of the third phase half-bridge is the same power switch Q1 as the upper arm power switch of the first half-bridge; the lower arm power switch of the third phase half-bridge is the same power switch Q2 as the lower arm power switch of the first half-bridge.

[0006] Optionally, the power switching device Q1 includes a first control pin and a second control pin, wherein the first control pin is connected to the control terminal of the compressor drive module, and the second control pin is connected to the control terminal of the first DC / DC converter; The power switching device Q2 includes a third control pin and a fourth control pin. The third control pin is connected to the control terminal of the compressor drive module, and the fourth control pin is connected to the control terminal of the first DC / DC converter.

[0007] Optionally, it also includes a rectifier and filter capacitor, which is connected in parallel with the compressor drive module and together connected to the external power input bus; The positive terminal of the rectifier filter capacitor is simultaneously connected to the first terminal of each upper bridge arm power switching device in the compressor drive module; the negative terminal of the rectifier filter capacitor is simultaneously connected to the second terminal of each lower bridge arm power switching device in the compressor drive module.

[0008] Optionally, it also includes a power factor correction module, a second DC / DC converter, and a second battery; The input terminal of the power factor correction module is connected to the power output terminal of an external AC power supply, and the output terminal of the power factor correction module is connected to the primary side of the second DC / DC converter. The secondary side of the second DC / DC converter is connected to the second battery; The compressor drive module is connected in parallel to the output of the power factor correction module.

[0009] Optionally, the second DC / DC converter is an isolated DC / DC converter.

[0010] Optionally, the power factor correction capacitor in the power factor correction module can be reused as the rectifier filter capacitor in the battery pack.

[0011] Optionally, the second DC / DC converter is a bidirectional DC / DC converter used to achieve the following energy transfer: The electrical energy from the external AC power source is transmitted to the second battery via the power factor correction module and the bidirectional DC / DC converter; or, The electrical energy from the second battery is transmitted in reverse to an external AC power source or an external AC load via the bidirectional DC / DC converter and the power factor correction module; or, The electrical energy from the second battery is transmitted via the bidirectional DC / DC converter to the compressor drive module, the first DC / DC converter, or the internal load.

[0012] Optionally, the secondary side of the second DC / DC converter is also connected to an external DC charging interface to receive DC power input from an external DC power source.

[0013] Optionally, the battery pack further includes a heating drive module, the two input terminals of which are respectively connected to the two output terminals of the first half-bridge of the first DC / DC converter.

[0014] According to a second aspect of this application, a battery system is also provided, including a controller and any of the battery packs described above.

[0015] According to a third aspect of this application, a vehicle is also provided, including the aforementioned battery system.

[0016] The battery pack in this embodiment includes: a compressor drive module, comprising a first phase half-bridge, a second phase half-bridge, and a third phase half-bridge; a first DC / DC converter, comprising a first half-bridge and a second half-bridge; a first battery, wherein the second half-bridge is connected to the first battery; wherein the upper arm power switch of the third phase half-bridge is the same power switch Q1 as the upper arm power switch of the first half-bridge; and the lower arm power switch of the third phase half-bridge is the same power switch Q2 as the lower arm power switch of the first half-bridge. Through the above technical solution, the same set of switching devices is reused, serving both as power switches within one phase arm of the compressor drive module and as power switches on the primary side of the DC / DC converter, reducing the number of power switches used and achieving the technical effects of increasing battery pack integration and effectively reducing costs.

[0017] Other features and advantages of this application will be described in detail in the following detailed description section. Attached Figure Description To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] To gain a more complete understanding of this application and its beneficial effects, the following description will be provided in conjunction with the accompanying drawings, wherein the same reference numerals in the following description denote the same parts.

[0019] Figure 1 This is a schematic diagram of the topology circuit of a battery pack provided in an exemplary embodiment of this application; Figure 2 This is a schematic diagram of a circuit topology corresponding to another battery pack provided in an exemplary embodiment of this application; Figure 3 This is a schematic diagram of the structural topology corresponding to the battery pack provided in an exemplary embodiment of this application; Figure 4This is a schematic diagram of the partial circuit flow during operation of the second DC / DC converter provided in an exemplary embodiment of this application; Figure 5 This is a schematic diagram of part of the circuit flow when the compressor drive module provided in the exemplary embodiment of this application is running; Figure 6 This is a schematic diagram of the vehicle architecture provided in an exemplary embodiment of this application.

[0020] Explanation of reference numerals in the attached figures: 10. Compressor drive module; 11. First phase half-bridge; 12. Second phase half-bridge; 13. Third phase half-bridge; K1. Upper arm power switch of the first phase half-bridge; K2. Upper arm power switch of the second phase half-bridge; K3. Upper arm power switch of the third phase half-bridge; K4. Lower arm power switch of the first phase half-bridge; K5. Lower arm power switch of the second phase half-bridge; K6. Lower arm power switch of the third phase half-bridge; 20. First DC / DC converter; 21. First half-bridge; 22. Second half-bridge; 30. First battery; 40. Power factor correction module; C1. Power factor correction capacitor; 50. Second DC / DC converter; 60. Second battery; 70. Heating drive module. Detailed Implementation

[0021] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the protection scope of this application.

[0022] According to the first aspect of this application, referring to Figure 1 This application provides a battery pack, including: a compressor drive module 10, including a first phase half-bridge 11, a second phase half-bridge 12 and a third phase half-bridge 13; a first DC / DC converter 20, including a first half-bridge 21 and a second half-bridge 22; a first battery 30, with the second half-bridge 22 connected to the first battery 30; wherein, the upper arm power switch device K3 of the third phase half-bridge 13 and the upper arm power switch device K3 of the first half-bridge 21 are the same power switch device Q1; the lower arm power switch device K6 of the third phase half-bridge 13 and the lower arm power switch device K6 of the first half-bridge 21 are the same power switch device Q2.

[0023] The above technical solution enables the reuse of the power switching devices of the third phase half-bridge of the compressor drive module and the power switching devices of the first half-bridge of the primary side of the first DC / DC converter. This directly reduces the number of power switching devices in the battery pack, simplifies the circuit structure, improves the integration of the battery pack, and reduces the material and manufacturing costs of the battery pack.

[0024] Specifically, in traditional solutions, the compressor drive module (driving the three-phase compressor motor) requires three independent complete half-bridges (a total of 6 power switching devices, such as...). Figure 1 In the first DC / DC converter, the primary side (high voltage side) of the first DC / DC converter (K1~K6) also requires at least one independent complete half-bridge (a total of 2 power switching devices). However, the topology circuit that reuses some power switching devices in the above-mentioned scheme of this application directly saves a set of power switching devices and their matching drive circuits compared with the traditional distributed scheme or the scheme that is only integrated in terms of physical structure, thus significantly reducing material costs.

[0025] Understandably, based on the above technical solution, by physically sharing the same set of power switching devices, the key power circuit elements (half-bridge) that originally belonged to two independent functional modules (compressor drive module and first DC / DC converter) are tightly integrated together, improving the physical and circuit integration of the two functional modules within the battery pack. At the same time, device reuse means eliminating redundant power switching devices and related connections that were originally required independently, making the power circuit structure within the battery pack simpler and more compact, which helps to reduce the size and weight of the battery pack.

[0026] It should be noted that the above Figure 1 This is merely a specific example corresponding to the embodiments of this application and is not intended to limit this application. The power switching device mentioned above may be a MOSFET (Metal-Oxide-Semiconductor Field-Effect Transistor), a JFET (Junction Field-Effect Transistor), or the like.

[0027] In some embodiments, the power switching device Q1 includes a first control pin and a second control pin, the first control pin being connected to the control terminal of the compressor drive module 10 and the second control pin being connected to the control terminal of the first DC / DC converter 20; the power switching device Q2 includes a third control pin and a fourth control pin, the third control pin being connected to the control terminal of the compressor drive module 10 and the fourth control pin being connected to the control terminal of the first DC / DC converter 20.

[0028] Based on the above configuration, when the control terminal of the compressor drive module 10 sends drive control signals to power switching devices Q1 and Q2, power switching devices Q1 and Q2 respectively function as the upper arm power switching device K3 and the lower arm power switching device K6 of the third phase half-bridge 13 of the compressor drive module 10. When the control terminal of the first DC / DC converter 20 sends drive control signals to power switching devices Q1 and Q2, power switching devices Q1 and Q2 respectively function as the upper arm power switching device K3 and the lower arm power switching device K6 of the first half-bridge 21 of the first DC / DC converter 20. This achieves the multiplexing of power switching devices without affecting the independent operation of the compressor drive module and the first DC / DC converter.

[0029] At the same time, based on the above settings, it is ensured that the compressor drive module and the DC / DC converter can independently and without interference control the same power switching device (Q1, Q2).

[0030] In some embodiments, the battery pack further includes a rectifier and filter capacitor, which is connected in parallel with the compressor drive module and together with it on the external power input bus; wherein, the positive terminal of the rectifier and filter capacitor is simultaneously connected to the first terminal of each upper bridge arm power switching device in the compressor drive module 10; and the negative terminal of the rectifier and filter capacitor is simultaneously connected to the second terminal of each lower bridge arm power switching device in the compressor drive module 10.

[0031] When the compressor drive module is operating, the switching action of its three-phase half-bridge (six power switching devices) generates significant current ripple and voltage ripple on its DC input side (i.e., the external power input bus). Based on this setup, parallel rectifier filter capacitors are directly connected between the positive and negative terminals of the external power input bus (i.e., between all upper bridge arm input terminals and all lower bridge arm output terminals), providing a low-impedance energy storage and filtering path for the compressor drive module. This significantly absorbs the high-frequency ripple component of the bus current, smooths the bus voltage, and provides high-quality, low-ripple DC power for the stable and efficient operation of the compressor drive module.

[0032] Meanwhile, since the load current changes abruptly when the power switching devices in the compressor drive module switch, the aforementioned rectifier filter capacitor can act as a localized energy pool to maintain the instantaneous stability of the DC bus voltage, prevent the bus voltage from dropping or spiked due to load changes, protect the power switching devices from voltage stress shocks, and improve the reliability and robustness of the battery system.

[0033] In some examples, by simultaneously connecting the positive terminal of the rectifier filter capacitor to the first terminal of all upper bridge arm devices (i.e., their common input / collector) and the negative terminal to the second terminal of all lower bridge arm devices (i.e., their common output / emitter), the potentials of all upper bridge arm input terminals in the compressor drive module are equal (both are the positive potential of the external power input bus), and the potentials of all lower bridge arm output terminals are equal (both are the negative potential of the external power input bus). This establishes a clear, stable, and shared voltage reference point for the three-phase half-bridge of the compressor drive module, improving the control accuracy of the three-phase output voltage.

[0034] Understandably, based on the above setup, the compressor drive module and the first DC / DC converter can share the same rectifier filter capacitor, thereby reducing the number of capacitors in the battery pack, lowering device costs, and effectively avoiding circulating current problems between multiple capacitors.

[0035] The first battery provided in this application, also known as a low-voltage battery, is mainly used to supply power to low-voltage loads in the vehicle.

[0036] In some embodiments, see Figure 2 , Figure 3 The battery pack also includes a power factor correction module 40, a second DC / DC converter 50, and a second battery 60; wherein the input terminal of the power factor correction module 40 is connected to the power output terminal of an external AC power source, and the output terminal of the power factor correction module 40 is connected to the primary side of the second DC / DC converter 50; the secondary side of the second DC / DC converter 50 is connected to the second battery 60; wherein the compressor drive module 10 is connected in parallel to the output terminal of the power factor correction module 40.

[0037] Based on the above configuration, this application provides a solution that integrates a power factor correction module (PFC module, also known as an on-board charger (OBC) module), a second DC / DC converter, a compressor drive module, and a first DC / DC converter within the battery pack. This improves AC charging efficiency while significantly reducing the use of high-voltage wiring harnesses, effectively lowering costs and significantly enhancing the overall vehicle hardware integration. Furthermore, by connecting the compressor drive module in parallel to the output of the power factor correction module, the electrical energy input from an external AC power source (such as an AC charging station) can not only charge the second battery via the PFC module and the high-voltage DC module (the second DC / DC converter), but also utilize the additional power from the AC charging station to supply power to the compressor drive module, thereby maximizing the utilization of the AC charging station's output power.

[0038] The second battery provided in this application, also known as a high-voltage battery or power battery, is mainly used to supply power to high-voltage loads in the vehicle.

[0039] According to a specific embodiment of this application, if the compressor needs to be started during vehicle charging, there is no need to consume the energy of the power battery or go through an additional conversion stage. The electrical energy from the external AC power supply can be directly (after PFC) used to drive the compressor, improving energy utilization efficiency (reducing conversion stage losses) and alleviating the additional load on the power battery during charging.

[0040] Understandably, the compressor drive module, as a high-voltage load, draws its power directly from the high-voltage DC bus output by the PFC module. This means that the high-voltage power supply path of the compressor drive module and the OBC charging path share the PFC output bus, which simplifies the high-voltage electrical connections inside the battery pack, reduces the need for wiring harnesses (especially high-voltage wiring harnesses), connectors, and possible protection devices, and lowers the complexity and cost of the battery system.

[0041] The integrated battery pack technical solution provided in this application integrates the compressor drive module, which was originally connected to the high-voltage bus side, with the primary circuit of the low-voltage DC / DC converter. This not only enables device reuse and reduces costs, but also maximizes the utilization of the output power of the AC charging pile. That is, the excess output power is used to power the compressor drive module, overcoming the problem in related technologies that when the charging power demand of the power battery is lower than the output power of the charging pile, some of the output power of the charging pile cannot be fully utilized.

[0042] In some embodiments, the second DC / DC converter described above is an isolated DC / DC converter.

[0043] The isolated converter transfers energy between its primary side (high voltage side, connected to the PFC output terminal) and secondary side (low voltage side, connected to the second battery) through a transformer (magnetic coupling), rather than through a direct electrical connection. This achieves electrical isolation between the high voltage primary side (PFC output bus) and the low voltage secondary side (second battery), as well as physical isolation between the compressor drive module and the high voltage bus, increasing the overall vehicle system safety factor.

[0044] In some examples, the power factor correction capacitor in the power factor correction module is reused as the rectifier filter capacitor in the battery pack.

[0045] See Figure 2The power factor correction capacitor C1 in the aforementioned power factor correction module 40 is reused as the rectifier filter capacitor in the aforementioned battery pack. In the battery pack provided by this application, the PFC output and the compressor drive module input are connected to the same high-voltage bus, thus making the PFC capacitor in the PFC module and the rectifier filter capacitor corresponding to the compressor drive module originally connected in parallel. Based on the above configuration, the PFC capacitor is reused as the rectifier filter capacitor in the battery pack, that is, two originally independent capacitors are merged into one physical capacitor. After merging, not only can the cost of the capacitor itself be saved (reducing the number of capacitors), but also the cost of connecting terminals, bus copper busbars and other supporting parts be reduced, directly reducing the material cost and manufacturing cost of the battery pack.

[0046] According to the embodiments of this application, the reused capacitor means that only one integrated high-voltage capacitor needs to be arranged at the PFC output. This capacitor has the following functions: smoothing PFC switching ripple and maintaining bus voltage stability; providing a low-impedance energy source for the compressor drive control module and absorbing bus current ripple caused by its switching. This eliminates the two capacitors originally located in the PFC module and the compressor drive module respectively, as well as the connection between them, simplifying the filtering topology of the high-voltage DC bus, reducing circuit complexity, saving internal space in the battery pack, and effectively avoiding circulating current problems between multiple capacitors.

[0047] During boost charging, placing the low-voltage DC / DC converter on the bus side can affect device selection. Based on the above-mentioned configuration in this application, the low-voltage DC / DC converter is placed at the output end of the PFC module, which is beneficial for the selection of the low-voltage DC / DC converter and the compressor drive module, and facilitates platform-based assembly.

[0048] In some examples, the second DC / DC converter 50 is a bidirectional DC / DC converter used to achieve the following energy transfer: transferring electrical energy from an external AC power source to a second battery 60 via a power factor correction module 40 and a bidirectional DC / DC converter; or, transferring electrical energy from the second battery 60 in reverse via a bidirectional DC / DC converter and a power factor correction module 40 to an external AC power source or an external AC load; or, transferring electrical energy from the second battery 60 to a compressor drive module, a first DC / DC converter, or an internal load via a bidirectional DC / DC converter.

[0049] Based on the above configuration, a bidirectional DC / DC converter is used to complete the forward (charging) and reverse (discharging) energy transfer between the high-voltage DC bus and the second battery, eliminating the need for an additional unidirectional discharge converter and simplifying the battery system architecture. The battery pack provided in this application can thus support the function of the second battery (power battery) in the vehicle to supply power to external AC loads or the external AC power grid, expanding the functionality and application scenarios of the battery pack.

[0050] According to a specific embodiment of the present application, when no external AC power is connected (such as during driving or parking), the battery pack can also use the power of the second battery to power the electronic control module (such as driving the compressor) or other internal high-voltage loads connected in parallel on the high-voltage bus after being boosted, thereby realizing high-voltage load power supply redundancy and improving the energy management flexibility and functionality of the battery pack.

[0051] It is understandable that the above energy transmission paths share the same power hardware (such as bidirectional DC / DC converters and PFC modules), maximizing the use of the hardware capabilities of PFC modules and bidirectional DC / DC converters, and avoiding setting up independent paths for energy flowing in different directions; at the same time, the optimized bidirectional converter can achieve high efficiency in both directions, avoiding the efficiency differences that may exist when using different unidirectional devices.

[0052] In some examples, the secondary side of the second DC / DC converter 50 is also connected to an external DC charging interface to receive DC power from an external DC power source.

[0053] Based on the above configuration, the secondary side of the second DC / DC converter is also connected to an external DC charging interface, allowing externally input DC power to be directly injected into the secondary circuit of the second DC / DC converter. This establishes a physical access channel within the battery pack for the DC fast charging function of the second battery, enabling the vehicle to be compatible with and utilize public DC fast charging stations for rapid charging.

[0054] Meanwhile, the DC charging path can also reuse the electrical isolation characteristics of the second DC / DC converter (isolated type). The DC power input from the external DC charging pile has passed through the isolation barrier of the isolated DC / DC converter before entering the low-voltage battery system (second battery) inside the battery pack, ensuring high-voltage safety isolation during the DC charging process. No additional isolation device is needed to meet automotive-grade safety requirements.

[0055] According to a specific embodiment of this application, when the second DC / DC converter is a bidirectional DC / DC converter, the following energy transfer can also be achieved: transferring electrical energy from an external DC power source to a power battery via the bidirectional DC / DC converter; or transferring electrical energy from the power battery to an external DC load via the bidirectional DC / DC converter. For example, it can realize vehicle-to-vehicle charging via a DC charging gun, and use the vehicle's DC interface to charge the battery of portable devices (such as DC-chargeable drones, mobile robots, and outdoor work equipment), further expanding the application scenarios of the battery pack.

[0056] In some embodiments, the battery pack further includes a heating drive module 70, the two input terminals of which are respectively connected to the two output terminals of the first half-bridge 21 of the first DC / DC converter 20.

[0057] Based on the above configuration, the heating drive module 70 (PTC module, PTC stands for Positive Temperature Coefficient) is integrated inside the battery pack, further improving the integration of the battery pack. Specifically, the two input terminals of the heating drive module 70 are directly connected to the two output terminals of the first half-bridge 21 of the first DC / DC converter 20, allowing the heating drive module 70 to directly receive AC or pulsed DC voltage from the half-bridge inverter output as its drive power. The power transmission path is: power from the high-voltage DC bus → the first half-bridge of the first DC / DC converter (multiplexed switching device inversion) → directly output to the heating drive module → heating load. This path is extremely short and direct, with fewer energy transmission links, reducing intermediate conversion losses (such as avoiding additional DC-AC or DC-DC conversion stages), and improving the overall efficiency of the battery pack's internal power for heating.

[0058] Furthermore, by controlling the on and off of the power switching devices (multiplexed devices K3 and K6) of the first half-bridge 21, the voltage amplitude, frequency, or duty cycle applied to the input of the heating drive module can be directly controlled, thereby precisely controlling the heating power. This eliminates the need for a separate inverter power circuit (such as a full-bridge or half-bridge) for the heating function, achieving deep reuse of power devices.

[0059] See Figure 3 This application provides a structural topology diagram of an integrated battery pack. The battery pack includes: an OBC module (i.e., the aforementioned power factor correction module 40), a DC module (i.e., the second DC / DC converter 50, also known as the high-voltage DC module), a battery pack (i.e., the second battery 60, a high-voltage battery), a compressor controller (i.e., the compressor drive module 10), a low-voltage DC module (i.e., the first DC / DC converter 20, also known as the low-voltage DC module), a small battery (i.e., the first battery 30, a low-voltage battery), and a PTC (i.e., the heating drive module 70), forming a battery pack housing, as well as other high-voltage components such as a compressor, an AC charging port, and a DC charging port. Figure 3As shown, the compressor is located outside the battery pack housing and connected to the compressor controller (i.e., compressor drive module 10) inside the housing. The compressor is driven by controlling the switching of the power switching devices in the inverter circuit located within the battery pack housing. Here, the compressor controller (i.e., compressor drive module 10) reuses the power switching devices on the primary side of the low-voltage DC module (i.e., the first DC / DC converter 20), achieving cost reduction for the battery system. Connecting the integrated components of the compressor controller and the low-voltage DC module across the OBC side, i.e., connecting them to the PFC output, not only reuses the PFC capacitor, achieving cost reduction, but also effectively reduces the circulating current problem caused by multiple capacitors. Furthermore, compared to existing solutions, this solution connects the compressor drive module, which is mounted on the bus side, to the low-voltage DC side, achieving physical isolation between the compressor and the high-voltage bus side. When the battery system detects a compressor fault, it can directly cut off the power supply to the OBC. In this case, although the compressor fails, it will not affect the bus side, improving the safety of the battery system.

[0060] Furthermore, to address different compressor power requirements, the battery pack provided in this application can utilize various control methods to achieve high-efficiency utilization of the charging pile's output power. When using an AC charging pile to charge the power battery and the air conditioner needs to be turned on, if the compressor's power demand is low, the remaining power from the AC charging pile beyond charging the power battery can be used to power the compressor drive module. If the compressor's power demand is high, the AC charging pile can reduce its charging power to the power battery to ensure compressor operation. If the AC charging pile is not used to charge the power battery, the power battery directly powers the compressor drive module through a high-voltage DC module, which can also meet the user's cooling needs.

[0061] According to a specific embodiment of this application, the power switching devices of the first half-bridge of the first DC / DC converter are reused to control the switching on and off of the battery pack, thereby realizing the input and output of the battery pack. The required function is achieved through circuit reuse and adjustment of the control algorithm, thus controlling the operation of the compressor. When the power switching devices K5 and K6 of the first half-bridge of the first DC / DC converter are closed, the battery pack can charge and discharge the small battery (i.e., the first battery) through the closing of these two power devices. Figure 4 This is a schematic diagram showing part of the current flow when the second battery (power battery) charges the first battery (small battery). Figure 5 This indicates the direction of current flow during the compressor drive process. (By...) Figure 4 and Figure 5It can be seen that the integrated solution of low-voltage DC module and compressor control module can achieve the function of controlling battery input and output by reusing circuit. The reuse of circuit in the integrated solution reduces the number of power switching devices used, which further reduces the cost. At the same time, each contactor in series in the circuit is reduced by one copper busbar, which can reduce the number of copper busbars and effectively reduce material and labor costs.

[0062] According to a second aspect of this application, a battery system is provided, comprising a controller and any of the aforementioned battery packs, wherein the controller is used to drive and control the on / off states of the power switching devices within the battery pack. This battery system possesses all the beneficial effects of the aforementioned battery packs, which will not be elaborated upon herein.

[0063] According to a third aspect of this application, a vehicle is provided, such as Figure 6 As shown, the vehicle 100 includes the aforementioned battery system and therefore possesses all the technical effects of the aforementioned battery system and battery pack, which will not be elaborated upon here.

[0064] The vehicle can be a gasoline-powered vehicle, a plug-in hybrid electric vehicle, or a new energy vehicle equipped with a battery system; this application does not specifically limit this.

[0065] In the description of this application, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include one or more features. In the description of this application, "multiple" means two or more, unless otherwise explicitly specified.

[0066] In the above embodiments, the descriptions of each embodiment have different focuses. For parts not described in detail in a certain embodiment, please refer to the relevant descriptions in other embodiments.

[0067] The embodiments, implementation methods, and related technical features of this application can be combined and substituted for each other without conflict.

[0068] The above are merely preferred embodiments of this application and are not intended to limit this application in any way. Any simple modifications, equivalent changes, and alterations made to the above embodiments based on the technical essence of this application without departing from the scope of the technical solution of this application shall still fall within the scope of the technical solution of this application.

Claims

1. A battery pack, characterized in that, include: The compressor drive module includes a first-phase half-bridge, a second-phase half-bridge, and a third-phase half-bridge; The first DC / DC converter includes a first half-bridge and a second half-bridge; The first battery is connected to the second half-bridge. Wherein, the upper arm power switch of the third phase half-bridge is the same power switch Q1 as the upper arm power switch of the first half-bridge; the lower arm power switch of the third phase half-bridge is the same power switch Q2 as the lower arm power switch of the first half-bridge.

2. The battery pack according to claim 1, characterized in that, The power switching device Q1 includes a first control pin and a second control pin. The first control pin is connected to the control terminal of the compressor drive module, and the second control pin is connected to the control terminal of the first DC / DC converter. The power switching device Q2 includes a third control pin and a fourth control pin. The third control pin is connected to the control terminal of the compressor drive module, and the fourth control pin is connected to the control terminal of the first DC / DC converter.

3. The battery pack according to claim 1, characterized in that, It also includes a rectifier and filter capacitor, which is connected in parallel with the compressor drive module and together with it on the external power input bus; The positive terminal of the rectifier filter capacitor is simultaneously connected to the first terminal of each upper bridge arm power switching device in the compressor drive module; the negative terminal of the rectifier filter capacitor is simultaneously connected to the second terminal of each lower bridge arm power switching device in the compressor drive module.

4. The battery pack according to claim 1, characterized in that, It also includes a power factor correction module, a second DC / DC converter, and a second battery; The input terminal of the power factor correction module is connected to the power output terminal of an external AC power supply, and the output terminal of the power factor correction module is connected to the primary side of the second DC / DC converter. The secondary side of the second DC / DC converter is connected to the second battery; The compressor drive module is connected in parallel to the output of the power factor correction module.

5. The battery pack according to claim 4, characterized in that, The second DC / DC converter is an isolated DC / DC converter.

6. The battery pack according to claim 4, characterized in that, The power factor correction capacitor in the power factor correction module is reused as the rectifier filter capacitor in the battery pack.

7. The battery pack according to claim 4, characterized in that, The second DC / DC converter is a bidirectional DC / DC converter used to achieve the following energy transfer: The electrical energy from the external AC power source is transmitted to the second battery via the power factor correction module and the bidirectional DC / DC converter; or, The electrical energy of the second battery is transmitted in reverse to an external AC power source or an external AC load via the bidirectional DC / DC converter and the power factor correction module. or, The electrical energy from the second battery is transmitted via the bidirectional DC / DC converter to the compressor drive module, the first DC / DC converter, or the internal load.

8. The battery pack according to claim 4, characterized in that, The secondary side of the second DC / DC converter is also connected to an external DC charging interface to receive DC power input from an external DC power source.

9. The battery pack according to claim 4, characterized in that, The battery pack also includes a heating drive module, the two input terminals of which are respectively connected to the two output terminals of the first half-bridge of the first DC / DC converter.

10. A battery system, characterized in that, Includes a controller and a battery pack according to any one of claims 1 to 9.

11. A vehicle, characterized in that, Includes the battery system of claim 10.

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