A battery integrated circuit and vehicle

Abstract

The utility model discloses an embodiment of a kind of battery integrated circuit and vehicle. Battery integrated circuit includes: battery module, excitation module and pre-charging module, battery module is electrically connected with excitation module and forms loop, battery module is electrically connected with pre-charging module and forms loop;Wherein, battery module includes at least two battery packs, excitation module includes first switch unit and first capacitor inductance unit, pre-charging module includes second switch unit and second capacitor inductance unit, battery pack, first switch unit, first capacitor inductance unit are sequentially electrically connected, battery pack, second switch unit, second capacitor inductance unit are sequentially electrically connected. The battery integrated circuit and vehicle provided in the utility model embodiment, can reduce power loss, reduce device cost, improve pre-charging reliability.

Description

Technical Field

[0001] This utility model relates to battery technology, and more particularly to a battery integrated circuit and a vehicle. Background Technology

[0002] Batteries, as the energy source for devices and components requiring power, play a vital role in various fields, such as the automotive industry. Currently, existing batteries are typically energized through external structures and pre-charged by capacitors, resulting in high power consumption and room for improvement in pre-charge reliability. Utility Model Content

[0003] This utility model provides a battery integrated circuit and a vehicle to reduce power loss, lower device costs, and improve pre-charge reliability.

[0004] This utility model embodiment provides a battery integrated circuit, including: a battery module, an excitation module, and a precharge module, wherein the battery module and the excitation module are electrically connected to form a circuit, and the battery module and the precharge module are electrically connected to form a circuit;

[0005] The battery module includes at least two battery packs, the excitation module includes a first switching unit and a first capacitor-inductor unit, and the pre-charge module includes a second switching unit and a second capacitor-inductor unit. The battery packs, the first switching unit, and the first capacitor-inductor unit are electrically connected in sequence, and the battery packs, the second switching unit, and the second capacitor-inductor unit are also electrically connected in sequence.

[0006] Optionally, the first switching unit includes a first switch, a second switch, a third switch, and a fourth switch; the first capacitor-inductor unit includes a first capacitor and a first inductor; and the battery module includes a first battery pack and a second battery pack. A first terminal of the first battery pack is electrically connected to a first terminal of the first switch; a second terminal of the first battery pack is electrically connected to a first terminal of the second battery pack; a second terminal of the first switch is electrically connected to a first terminal of the second switch; a second terminal of the second switch is electrically connected to a second terminal of the first battery pack and a first terminal of the third switch; a second terminal of the third switch is electrically connected to a first terminal of the fourth switch and one terminal of the first capacitor; and the other terminal of the first capacitor is electrically connected to a second terminal of the first switch via the first inductor.

[0007] Optionally, the first switching unit includes a first switch, a fifth switch, a sixth switch, and a seventh switch; the second capacitor-inductor unit includes a first inductor and a second capacitor; and the battery module includes a first battery pack and a second battery pack. A first terminal of the first battery pack is electrically connected to a first terminal of the first switch and a first terminal of the sixth switch; a second terminal of the first battery pack is electrically connected to a first terminal of the second battery pack; a second terminal of the first switch is electrically connected to a first terminal of the first inductor; a second terminal of the first inductor is electrically connected to a first terminal of the fifth switch; a second terminal of the fifth switch is electrically connected to a second terminal of the sixth switch and a first terminal of the second capacitor; a second terminal of the second capacitor is electrically connected to a first terminal of the seventh switch; and a second terminal of the seventh switch is electrically connected to a second terminal of the second battery pack and a first terminal of the first inductor.

[0008] Optionally, both the sixth switch and the seventh switch are relay switches.

[0009] Optionally, the precharge module further includes a diode, the positive terminal of which is electrically connected to the second terminal of the seventh switch, and the negative terminal of which is electrically connected to the first terminal of the first inductor.

[0010] Optionally, the switch in the excitation module is a transistor switch, and the diode is the body diode of the transistor switch.

[0011] Optionally, the excitation module is used to control the at least two battery packs to alternately charge and discharge when the battery pack, the first switch unit, and the first capacitor-inductor unit form a circuit, according to the working state of the first switch unit; the pre-charge module is used to pre-charge the capacitor in the pre-charge module when the battery pack, the second switch unit, and the second capacitor-inductor unit form a circuit, according to the working state of the second switch unit.

[0012] Optionally, the control frequency of the excitation module is higher than 100kHz, and the control frequency is the same as the switching frequency of each switch in the excitation module.

[0013] Optionally, the battery integrated circuit also includes a controller electrically connected to each of the switches, the controller being used to control the on / off state of each of the switches.

[0014] Optionally, each of the switches includes at least one of a transistor switch and a relay switch.

[0015] Secondly, embodiments of the present invention provide a vehicle including the battery integrated circuit as described in the first aspect.

[0016] The battery integrated circuit and vehicle provided in this embodiment of the present invention include: a battery module, an excitation module, and a pre-charge module. The battery module and the excitation module are electrically connected to form a circuit, and the battery module and the pre-charge module are also electrically connected to form a circuit. The battery module includes at least two battery packs, the excitation module includes a first switching unit and a first capacitor-inductor unit, and the pre-charge module includes a second switching unit and a second capacitor-inductor unit. The battery packs, the first switching unit, and the first capacitor-inductor unit are sequentially electrically connected, as are the battery pack, the second switching unit, and the second capacitor-inductor unit. The battery integrated circuit and vehicle provided in this embodiment of the present invention provide an excitation source for the battery module through the excitation module. The energy of the battery module is transferred between the battery packs without additional power loss. The inductor in the second capacitor-inductor unit of the pre-charge module and the capacitor in the second capacitor-inductor unit of the pre-charge module pre-charge the battery module. This solves the problems of high device cost and low reliability in existing pre-charge methods using pre-charge resistors and pre-charge relays, thereby reducing device cost and improving pre-charge reliability. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the structure of a battery integrated circuit provided in an embodiment of the present invention;

[0018] Figure 2 This is a schematic diagram of the structure of an excitation module provided in an embodiment of the present invention;

[0019] Figure 3 This is a schematic diagram of the charging and discharging process of a battery pack according to an embodiment of the present invention;

[0020] Figure 4 This is a schematic diagram of capacitor voltage and inductor current provided in an embodiment of the present invention;

[0021] Figure 5 This is a schematic diagram of the structure of a pre-charge module provided in an embodiment of the present invention;

[0022] Figure 6 This is a schematic diagram of a pre-charging method provided in an embodiment of the present utility model;

[0023] Figure 7 This is a schematic diagram of another pre-charging method provided in an embodiment of the present invention;

[0024] Figure 8 This is a schematic diagram of current and voltage provided in an embodiment of the present invention;

[0025] Figure 9 This is a schematic diagram of another battery integrated circuit provided in an embodiment of the present invention. Detailed Implementation

[0026] The present invention will now be described in further detail with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and not intended to limit it. Furthermore, it should be noted that, for ease of description, the accompanying drawings show only the parts relevant to the present invention, not the entire structure.

[0027] Figure 1 This is a schematic diagram of a battery integrated circuit provided in an embodiment of this utility model. (Reference) Figure 1 The battery integrated circuit includes a battery module 10, an excitation module 20, and a precharge module 30. The battery module 10 and the excitation module 20 are electrically connected to form a circuit, and the battery module 10 and the precharge module 30 are also electrically connected to form a circuit. The battery module 10 includes at least two battery packs. The excitation module 20 includes a first switching unit 21 and a first capacitor-inductor unit 22. The precharge module 30 includes a second switching unit 31 and a second capacitor-inductor unit 32. The battery packs, the first switching unit 21, and the first capacitor-inductor unit 22 are sequentially electrically connected, as are the battery packs, the second switching unit 31, and the second capacitor-inductor unit 32.

[0028] Specifically, taking the battery integrated circuit of a vehicle as an example, the capacitor in the second capacitor-inductor unit 32 of the precharge module 30 is the vehicle X capacitor, and the battery pack in the battery module 10 (different battery packs may include the same or different numbers of batteries) and the inductor in the second capacitor-inductor unit 32 of the precharge module 30 precharge the vehicle X capacitor. When the second switch unit 31 of the precharge module 30 is in different working states, the vehicle X capacitor is precharged by different modules. When the second switch unit 31 of the precharge module 30 is in one working state, the vehicle X capacitor is precharged by the inductor in the second capacitor-inductor unit 32 of the precharge module 30. When the second switch unit 31 of the precharge module 30 is in another working state, the vehicle X capacitor is precharged by the battery pack in the battery module 10. Taking the battery module 10, which includes two battery packs, as an example, the excitation module 20 controls one battery pack in the battery module 10 to charge the other battery pack according to the working state of the first switch unit 21. That is, one battery pack discharges while the other battery pack is charged. After a preset time, reverse charging occurs, that is, the currently charging battery pack charges the currently discharging battery pack, so as to realize the alternating charging and discharging between the battery packs.

[0029] The battery integrated circuit provided in this embodiment includes: a battery module, an excitation module, and a precharge module. The battery module and the excitation module are electrically connected to form a circuit, and the battery module and the precharge module are also electrically connected to form a circuit. The battery module includes at least two battery packs. The excitation module includes a first switching unit and a first capacitor-inductor unit. The precharge module includes a second switching unit and a second capacitor-inductor unit. The battery packs, the first switching unit, and the first capacitor-inductor unit are sequentially electrically connected, as are the battery pack, the second switching unit, and the second capacitor-inductor unit. The battery integrated circuit provided in this embodiment provides an excitation source to the battery module through the excitation module. The energy of the battery module is transferred between the battery packs without additional power loss. The inductor in the second capacitor-inductor unit of the precharge module and the capacitor in the second capacitor-inductor unit of the precharge module precharge the battery module. This solves the problems of high device cost and low reliability associated with existing precharge resistors and precharge relays, thereby reducing device cost and improving precharge reliability.

[0030] Figure 2 This is a schematic diagram of the structure of an excitation module provided in an embodiment of this utility model. (Reference) Figure 2 Optionally, the first switch module 21 includes a first switch S1, a second switch S2, a third switch S3, and a fourth switch S4; the first capacitor-inductor module 22 includes a first capacitor C1 and a first inductor L1; and the battery module 10 includes a first battery pack 11 and a second battery pack 12. The first end of the first battery pack 11 is electrically connected to the first end of the first switch S1, the second end of the first battery pack is electrically connected to the first end of the second battery pack, the second end of the first switch S1 is electrically connected to the first end of the second switch S1, the second end of the second switch S2 is electrically connected to the second end of the first battery pack 11 and the first end of the third switch S3, the second end of the third switch S3 is electrically connected to the first end of the fourth switch S4 and one end of the first capacitor C1, and the other end of the first capacitor C1 is electrically connected to the second end of the first switch S4 through the first inductor L1.

[0031] Specifically, the excitation module 20 controls the first battery pack 11 to charge the second battery pack 12 or controls the second battery pack 12 to charge the first battery pack 11 according to the on / off state of its own switches. Figure 3 This is a schematic diagram of the charging and discharging process of a battery pack according to an embodiment of the present invention. Figure 4 This is a schematic diagram of capacitor voltage and inductor current provided in an embodiment of this utility model. (Reference) Figure 3 and Figure 4 The process of the first battery pack 11 discharging to charge the second battery pack 12 can be divided into four stages. Stage 1: The first switch S1 and the third switch S3 are closed, the second switch S2 and the fourth switch S4 are open, and the first battery pack 11 discharges to charge the second battery pack 12. Figure 3The red-line circuit shown charges the first inductor L1 and the first capacitor C1. The current IL of the first inductor L1 gradually increases (forward), and the voltage VC1 of the first capacitor C1 increases to the voltage V1 of the first battery pack 11 or the voltage V2 of the second battery pack 12. In stage two: the second switch S2 and the third switch S3 are closed, and the first switch S1 and the fourth switch S4 are open. The first inductor L1 continues to carry current, continuing to charge the first capacitor C1 until the current of the first inductor L1 is 0, and the voltage VC1 of the first capacitor C1 continues to increase. By controlling the duty cycle of each switch in stages one and two, the voltage of the first capacitor C1 is slightly greater than that of the second battery pack 12. Phase 3: The second switch S2 and the fourth switch S4 are closed, the first switch S1 and the third switch S3 remain open, the first capacitor C1 discharges, charging the first inductor L1 and the second battery pack 12, the current of the first inductor L1 gradually increases (in reverse), and the voltage VC1 of the first capacitor C1 decreases; Phase 4: The first switch S1 and the fourth switch S4 are closed, the second switch S2 and the third switch S3 are open, the first inductor L1 and the first capacitor C1 discharge, charging the first battery pack 11 and the second battery pack 12 until the current of the first inductor L1 is 0, and then the first to fourth phases are repeated until the time t reaches the preset time.

[0032] Similarly, the charging of the first battery pack 11 by the second battery pack 12 can also be divided into four stages. Stage 1: The first switch S1 and the third switch S3 are open, the second switch S2 and the fourth switch S4 are closed, and the second battery pack 12 charges the first inductor L1 and the first capacitor C1, with the inductor current gradually increasing (forward). Stage 2: The second switch S2 and the third switch S3 are closed, the first switch S1 and the fourth switch S4 are open, and the first inductor L1 continues to carry current, continuing to charge the first capacitor C1 until the current of the first inductor L1 is 0. By controlling the duty cycle of each switch in stages 1 and 2, the voltage of the first capacitor C1 is slightly greater than the voltage of the second battery pack 12 at this time. Phase 3: The second switch S2 and the fourth switch S4 are open, the first switch S1 and the third switch S3 are closed, the first capacitor C1 discharges, and the first inductor L1 and the first battery pack 11 are charged. The current of the first inductor L1 gradually increases (in reverse). Phase 4: The first switch S1 and the fourth switch S4 are closed, the second switch S2 and the third switch S3 are open, the first inductor L1 and the first capacitor C1 discharge, and the first battery pack 11 and the second battery pack 12 are charged until the current of the first inductor L1 is 0. Then, Phases 1 to 4 are repeated until the duration reaches the preset time.

[0033] Furthermore, by alternating charging and discharging of the first battery pack 11 and the second battery pack 12, the first battery pack 11 and the second battery pack 12 can be excited by current respectively, and energy can be transferred between the first battery pack 11 and the second battery pack 12. The useless power loss in the excitation process is small; since the objects being charged and discharged are all batteries, the charging and discharging capacity is strong.

[0034] Figure 5 This is a schematic diagram of the structure of a pre-charge module provided in an embodiment of this utility model. (Reference) Figure 5 Optionally, the second switch module 31 includes a first switch S1, a fifth switch S5, a sixth switch S6, and a seventh switch S7; the second capacitor-inductor module 32 includes a first inductor L1 and a second capacitor C2; and the battery module 10 includes a first battery pack 11 and a second battery pack 12. The first end of the first battery pack 11 is electrically connected to the first end of the first switch S1 and the first end of the sixth switch S6; the second end of the first battery pack 11 is electrically connected to the first end of the second battery pack 12; the second end of the first switch S1 is electrically connected to the first end of the first inductor L1; the second end of the first inductor L1 is electrically connected to the first end of the fifth switch S5; the second end of the fifth switch S5 is electrically connected to the second end of the sixth switch S6 and the first end of the second capacitor C2; the second end of the second capacitor C2 is electrically connected to the first end of the seventh switch S7; and the second end of the seventh switch S7 is electrically connected to the second end of the second battery pack 12 and the first end of the first inductor L1.

[0035] In this configuration, the first battery pack 11, the second battery pack 12, and the first inductor L1 are used for pre-charging of the second capacitor C2. Specifically, taking the battery integrated circuit of the vehicle as an example, the second capacitor C2 is the vehicle's X capacitor. Figure 6 This is a schematic diagram of a pre-charging method provided by an embodiment of the present invention. Figure 7 This is a schematic diagram of another pre-charging method provided by an embodiment of the present invention. Figure 8 This is a schematic diagram of current and voltage provided in an embodiment of this utility model. (Reference) Figure 6 , Figure 7 and Figure 8The pre-charging process is as follows: First, the fifth switch S5 and the seventh switch S7 are closed; then, the first switch S1 is controlled by the PWM wave output by the controller to charge the vehicle's X capacitor; the charging current of the vehicle's X capacitor is the same as the current IL of the first inductor L1. The controller can determine the charging current of the vehicle's X capacitor by detecting the current of the first inductor L1. The controller generates a corresponding PWM wave based on the current of the first inductor L1 to control the opening and closing of the first switch S1 to achieve current-limited charging; finally, when the voltage of the vehicle capacitor is the sum of the voltages of the first battery pack 11 and the second battery pack 12, it indicates that the pre-charging is complete. At this time, the controller controls the sixth switch S6 to close and the seventh switch S7 to open, completing the pre-charging. In the above pre-charging process, when the first switch S1 is closed, the first battery pack 11 and the second battery pack 12 charge the first inductor L1 and the second capacitor C2, as shown above. Figure 6 The red circuit shown forms the pre-charge circuit when the first switch S1 is closed; when the first switch S1 is open, the first inductor L1 charges the second capacitor C2, as shown. Figure 7 The red circuit shown forms the pre-charge circuit when the first switch S1 is open. Furthermore, during the pre-charge process, the inductor's current-limiting characteristic is used to achieve current-limited charging of the vehicle's X capacitor. The charging time can be adjusted by the current limit, and it is shorter than the traditional pre-charge scheme (0.5s) using a pre-charge resistor and a pre-charge relay. The voltage VC2 of the vehicle's X capacitor increases linearly and smoothly, resulting in less disturbance to the battery's high-voltage circuit.

[0036] Optionally, both the sixth switch S6 and the seventh switch S7 are relay switches.

[0037] In this circuit, the sixth switch S6 is the main positive relay switch, and the seventh switch S7 is the main negative relay switch. Specifically, the first and second terminals of the sixth switch S6 are the contacts of the main positive relay switch, and the first and second terminals of the seventh switch S7 are the contacts of the main negative relay switch. The coils of the main positive and negative relay switches can be controlled by a controller. Furthermore, a relay switch is an electronic component that uses electromagnetic principles or other physical effects to control the on / off state of a circuit. It can achieve high / low voltage and strong / weak current isolation. The control terminal (coil) and the controlled terminal (contact) of the relay switch are electrically completely isolated, and they can use power supplies of different voltage levels. This isolation effectively protects the control terminal of the relay switch from high voltage or strong current interference, while preventing a fault in the controlled terminal from affecting the control terminal, thus improving safety. Relay switches can expand control capabilities; they can control large currents with small currents. The control terminal (coil) only requires a small current (typically a few milliamps to hundreds of milliamps) to drive, while the controlled terminal (contact) can carry a large current (from a few amps to tens of amps, or even higher), allowing direct control of high-power devices. Relay contacts come in various forms, such as normally open, normally closed, and changeover contacts, and can be flexibly combined to achieve various logic controls such as self-locking, interlocking, and time delay. Relay contacts are mechanical contacts with extremely low resistance (typically in the milliohm range) when conducting, and negligible voltage drop, making them suitable for high-current applications. They are also less affected by factors such as temperature and frequency, exhibiting stability superior to some electronic switches like transistors. Some relays possess vibration and shock resistance characteristics, enabling stable operation in automotive circuits. Relay switches can work with various control signals, such as those output by controllers, to achieve automated control. For example, a relay switch in a battery integrated circuit receives control signals, controls its own on / off state, and thus controls the on / off state of the circuit it connects to. Some special relays, such as overcurrent relays and overvoltage relays, can serve as protective components: when the current or voltage in the circuit exceeds a set value, the relay contacts automatically open, cutting off the circuit and protecting the circuit and its components from damage. The core value of relay switches lies in isolation, amplification, and flexible control. Especially in scenarios requiring high and low voltage isolation, high power control, or complex logic switching, their advantages far outweigh those of direct manual switches or simple electronic switches, making them an indispensable key component in electrical control systems.

[0038] Optionally, the precharge module 30 also includes a diode D1, the anode of which is electrically connected to the second terminal of the seventh switch S7, and the cathode of which is electrically connected to the first terminal of the first inductor L1. Specifically, as shown... Figure 7 As shown, when the first inductor L1 charges the second capacitor C2, the diode D1 can act as a freewheeling current and prevent the current of the first inductor L1 from flowing in the reverse direction.

[0039] Figure 9This is a schematic diagram of another battery integrated circuit provided in an embodiment of this utility model. (Reference) Figure 9 Optionally, the switch in the excitation module 20 is a transistor switch, and the diode is the body diode of the transistor switch.

[0040] Specifically, the switches in the excitation module 20 include a first transistor Q1, a second transistor Q2, a third transistor Q3, and a fourth transistor Q4. Figure 7 Diode D1 in the middle is composed of Figure 9 The body diodes of the second transistor Q2, the third transistor Q3, and the fourth transistor Q4 are replaced, saving components. Furthermore, the fifth switch in the precharge module 30 includes the fifth transistor Q5 and the sixth transistor Q6. The control terminals of each transistor are electrically connected to the controller, which controls the on / off state of each transistor. Figure 9 The circuit shown has an overall component integration of over 80%, which reduces component costs. Function integration allows for time-sharing reuse, and the pre-charge function is only activated during the high-voltage process on the battery module (the application scenario is short-term and infrequent), at which time there is no excitation requirement.

[0041] For example, the transistor switch is a MOSFET. MOSFETs are characterized by low power consumption and high efficiency. The power consumption at the control terminal of a MOSFET is extremely low: MOSFETs are voltage-controlled devices, and the gate (control terminal) consumes almost no current (there is an insulating layer between the gate and the source / drain, and the input resistance is extremely high, typically reaching 10 ohms). 12 MOSFETs (with a gate resistance of Ω or higher) only require a certain gate voltage to control conduction, far lower than the control power consumption of current-controlled transistors. Low conduction loss: When a MOSFET is turned on, its on-resistance can reach the milliohm level or even the microohm level. In high-current scenarios, the power loss is much lower than that of mechanical relays or transistors, making it particularly suitable for high-frequency switching circuits and significantly improving circuit efficiency. MOSFETs have excellent high-frequency characteristics and fast response speed. The switching action of a MOSFET only involves the charging and discharging of the gate capacitor. Compared to relays and transistors, there are no mechanical contacts or carrier storage effects, allowing switching speeds to reach nanosecond levels. They can easily operate at frequencies from tens of kHz to MHz, suitable for high-frequency switching scenarios, reducing circuit size, eliminating the need for large-capacity filter components, and improving dynamic performance. MOSFETs have a simple structure and are easy to drive. Only a suitable gate voltage, such as 5V or 12V, is needed to control conduction, eliminating the need for complex drive circuits. MOSFETs have strong impact resistance and high reliability. Compared to relays, they have no mechanical contacts, eliminating problems such as contact wear, oxidation, and arc erosion. Their service life is extremely long, theoretically up to 10 years. 15More than one switching operation. Some power MOSFETs integrate overcurrent protection, overheat protection, and electrostatic discharge protection, automatically shutting off under overload or abnormal conditions to improve circuit safety. MOSFETs have high power density, making them suitable for miniaturization. Their compact size, especially surface-mount MOSFETs, significantly saves PCB space, making them suitable for portable devices and dense circuits. Combined with synchronous rectification and other technologies, high power output can be achieved in a small form factor. MOSFETs come in a variety of types, suitable for a wide range of applications. Based on channel type, MOSFETs can be divided into NMOS and PMOS, with voltage ratings ranging from a few volts to thousands of volts and current ratings from milliamps to hundreds of amps, meeting the needs of different scenarios, such as low-voltage, low-current and high-voltage, high-current applications. MOSFETs have strong parallel expansion capabilities; multiple MOSFETs can be easily connected in parallel, such as through gate drive matching, to carry larger currents without changing the specifications of individual MOSFETs, offering high flexibility. The core advantages of MOSFETs are high efficiency, high frequency, low power consumption, and long lifespan. Especially in scenarios requiring fast switching, high-frequency operation, or high efficiency, their performance is far superior to relays and transistors.

[0042] Optionally, the control frequency of the excitation module 20 is higher than 100kHz, and the control frequency is the same as the switching frequency of each switch in the excitation module 20. Compared with the existing external electric drive excitation method, the control frequency is increased from 6~16kHz to over 100kHz, which is a significant improvement.

[0043] Optionally, the battery integrated circuit also includes a controller (not shown in the figure), which is electrically connected to each switch and is used to control the on / off state of each switch.

[0044] Specifically, the controller is electrically connected to the control terminals of each switch. The controller controls the on / off state of each switch by transmitting control signals to the control terminals of each switch. For example, the controller transmits a PWM signal to the first switch to control the on / off state of the first switch.

[0045] Optionally, each switch includes at least one of transistor switches and relay switches.

[0046] Specifically, switches include transistor switches such as MOSFETs (low power consumption) and relay switches (for isolation). For example, the switches in the excitation module are MOSFETs, while the switches in the precharge module include both MOSFETs and relay switches. (Reference) Figure 5 The sixth switch S6 and the seventh switch S7 in the precharge module are relay switches.

[0047] The battery integrated circuit provided in this embodiment provides an excitation source for the battery modules through an excitation module. The energy of the battery modules is transferred between battery packs without additional power loss. The inductor in the second capacitor-inductor unit of the precharge module and the capacitor in the second capacitor-inductor unit of the battery module precharge the battery modules. This solves the problems of high device cost and low reliability of the existing precharge methods using precharge resistors and precharge relays, thereby reducing device cost and improving precharge reliability. Furthermore, the excitation module and the precharge module share the first switch and the first capacitor, resulting in a high degree of circuit integration. The integrated setup of the excitation module and the precharge module allows the excitation function and the precharge function to be time-division multiplexed, with no application conflict between the two functions. Moreover, the overall device integration in the circuit is over 80%, greatly reducing device cost.

[0048] This embodiment also provides a vehicle including a battery integrated circuit as described in any embodiment of this utility model. The battery integrated circuit is a component of the vehicle's battery system. The vehicle provided in this embodiment belongs to the same inventive concept as the battery integrated circuit provided in any embodiment of this utility model and has corresponding beneficial effects. For detailed technical details not covered in this embodiment, please refer to the battery integrated circuit provided in any embodiment of this utility model.

[0049] Note that the above description is merely a preferred embodiment of the present invention and the technical principles employed. Those skilled in the art will understand that the present invention is not limited to the specific embodiments described herein, and various obvious changes, readjustments, combinations, and substitutions can be made without departing from the scope of protection of the present invention. Therefore, although the present invention has been described in detail through the above embodiments, the present invention is not limited to the above embodiments, and may include many other equivalent embodiments without departing from the concept of the present invention. The scope of the present invention is determined by the scope of the appended claims.

Claims

1. A battery integrated circuit, characterized in that, include: The battery module, the excitation module, and the precharge module are electrically connected to form a circuit. The battery module includes at least two battery packs, the excitation module includes a first switching unit and a first capacitor-inductor unit, and the pre-charge module includes a second switching unit and a second capacitor-inductor unit. The battery packs, the first switching unit, and the first capacitor-inductor unit are electrically connected in sequence, and the battery packs, the second switching unit, and the second capacitor-inductor unit are also electrically connected in sequence. The excitation module is used to control the at least two battery packs to charge and discharge alternately when the battery pack, the first switch unit, and the first capacitor-inductor unit form a circuit, according to the working state of the first switch unit. The pre-charge module is used to pre-charge the capacitor in the pre-charge module when the battery pack, the second switch unit, and the second capacitor-inductor unit form a circuit, according to the working state of the second switch unit.

2. The battery integrated circuit according to claim 1, characterized in that, The first switching unit includes a first switch, a second switch, a third switch, and a fourth switch; the first capacitor-inductor unit includes a first capacitor and a first inductor; the battery module includes a first battery pack and a second battery pack; a first terminal of the first battery pack is electrically connected to a first terminal of the first switch; a second terminal of the first battery pack is electrically connected to a first terminal of the second battery pack; a second terminal of the first switch is electrically connected to a first terminal of the second switch; a second terminal of the second switch is electrically connected to a second terminal of the first battery pack and a first terminal of the third switch; a second terminal of the third switch is electrically connected to a first terminal of the fourth switch and one terminal of the first capacitor; and the other terminal of the first capacitor is electrically connected to a second terminal of the first switch through the first inductor.

3. The battery integrated circuit according to claim 1, characterized in that, The second switching unit includes a first switch, a fifth switch, a sixth switch, and a seventh switch; the second capacitor-inductor unit includes a first inductor and a second capacitor; the battery module includes a first battery pack and a second battery pack; the first terminal of the first battery pack is electrically connected to the first terminal of the first switch and the first terminal of the sixth switch; the second terminal of the first battery pack is electrically connected to the first terminal of the second battery pack; the second terminal of the first switch is electrically connected to the first terminal of the first inductor; the second terminal of the first inductor is electrically connected to the first terminal of the fifth switch; the second terminal of the fifth switch is electrically connected to the second terminal of the sixth switch and the first terminal of the second capacitor; the second terminal of the second capacitor is electrically connected to the first terminal of the seventh switch; and the second terminal of the seventh switch is electrically connected to the second terminal of the second battery pack and the first terminal of the first inductor.

4. The battery integrated circuit according to claim 3, characterized in that, Both the sixth switch and the seventh switch are relay switches.

5. The battery integrated circuit according to claim 3, characterized in that, The precharge module also includes a diode, the positive terminal of which is electrically connected to the second terminal of the seventh switch, and the negative terminal of which is electrically connected to the first terminal of the first inductor.

6. The battery integrated circuit according to claim 5, characterized in that, The switch in the excitation module is a transistor switch, and the diode is the body diode of the transistor switch.

7. The battery integrated circuit according to any one of claims 1-6, characterized in that, The excitation module is used to control the at least two battery packs to charge and discharge alternately when the battery pack, the first switch unit, and the first capacitor-inductor unit form a circuit, according to the working state of the first switch unit; the pre-charge module is used to pre-charge the capacitor in the pre-charge module when the battery pack, the second switch unit, and the second capacitor-inductor unit form a circuit, according to the working state of the second switch unit.

8. The battery integrated circuit according to any one of claims 1-6, characterized in that, The control frequency of the excitation module is higher than 100kHz, and the control frequency is the same as the switching frequency of each switch in the excitation module.

9. The battery integrated circuit according to any one of claims 1-6, characterized in that, It also includes a controller, which is electrically connected to each of the switches and is used to control the on / off state of each of the switches.

10. The battery integrated circuit according to any one of claims 1-6, characterized in that, Each of the aforementioned switches includes at least one of transistor switches and relay switches.

11. A vehicle, characterized in that, Including the battery integrated circuit as described in any one of claims 1-10.

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