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CN-122008958-A - Vehicle-mounted electric vehicle charging and discharging battery pack

CN122008958ACN 122008958 ACN122008958 ACN 122008958ACN-122008958-A

Abstract

The invention provides a vehicle-mounted electric vehicle charging and discharging battery pack, which relates to the technical field of electric vehicle batteries and comprises a main energy storage module, an auxiliary charging and discharging module, a bidirectional power conversion module and an intelligent battery management system; the main energy storage module is formed by connecting high-energy density lithium iron phosphate battery cells in series, the auxiliary charging and discharging module is formed by connecting high-power density lithium battery cells in parallel, the main energy storage module and the auxiliary charging and discharging module are both in independent packaging structures, and quick-plug type conductive connectors and positioning buckles are arranged on the outer sides of the modules. The bidirectional power conversion module can reversely output the electric energy of the battery pack to other electric vehicles, emergency rescue and power supply are provided for another electric vehicle in a power shortage state, multifunctional energy interaction of V2G, V & lt 2 & gt 2L, V2 & lt 2 & gt V is realized, the application scene of the battery pack is expanded, the practicability and the economy of the battery pack are improved, and the problem of single function of the battery pack is solved.

Inventors

  • REN YONGCUN
  • ZHANG ZUOQIN

Assignees

  • 四川爱利发新能源科技有限公司

Dates

Publication Date
20260512
Application Date
20260409

Claims (5)

  1. 1. The vehicle-mounted electric vehicle charging and discharging battery pack is characterized by comprising a main energy storage module (1), an auxiliary charging and discharging module (2), a bidirectional power conversion module (3), an intelligent battery management system (4), an isolated heat management system (5), a mechanical protection shell (6) and a high-voltage electric circuit; the main energy storage module (1) is formed by connecting high-energy-density lithium iron phosphate battery cells in series and is used for power supply and conventional energy storage of a vehicle running foundation, the auxiliary charging and discharging module (2) is formed by connecting high-power-density lithium battery cells in parallel and is used for peak power compensation, braking energy recovery and bidirectional charging and discharging interaction, the main energy storage module (1) and the auxiliary charging and discharging module (2) are respectively in independent packaging structures, a fast-plugging conductive connector (9) and a positioning buckle (602) are arranged on the outer sides of the main energy storage module (1) and the auxiliary charging and discharging module (2), an aerogel heat insulation cushion layer (7) and an independent pressure release channel (8) are arranged between the main energy storage module (1) and the auxiliary charging and discharging module (2), the end face of the aerogel heat insulation cushion layer (7) is tightly attached to the inner wall of a mechanical protection shell (6), the pressure release channel (8) is communicated with the outer part of the mechanical protection shell (6), the isolated heat management system (4) comprises a liquid cooling loop (10), an air cooling loop (11), a heater (12) and a valve group to form a self-adaptive temperature control closed loop, under a low-temperature working condition, the temperature control heater (12) is automatically started to preheat the main energy storage module (1) and the auxiliary charging and discharging module (2), under a high-temperature working condition, the liquid cooling loop (10) and the air cooling loop (11) are synchronously started, under a fault working condition, the isolated heat management system (4) cuts off a power supply loop of the fault module, the positioning buckle (602) consists of a first buckle plate (6021) and a second buckle plate (6022), inclined plane poking plates are respectively arranged at the tops of the first buckle plate (6021) and the second buckle plate (6022), inclined planes of the inclined plane poking plates are oppositely arranged, an electromagnetic iron core clamping rod and a slot corresponding to the positions of the joint surfaces of the first buckle plate (6021) and the second buckle plate (6022) are arranged, an electromagnetic iron core is arranged in the electromagnetic iron core clamping rod and is electrically connected with the intelligent battery management system (4), and the high-voltage electric loop is connected with the main energy storage module (1), the auxiliary charging and discharging module (2), the bidirectional power conversion module (3) and an external interface.
  2. 2. The vehicle-mounted electric vehicle charging and discharging battery pack according to claim 1, wherein the bidirectional power conversion module (3) integrates a bidirectional DC/DC converter, a high-voltage relay, a fuse and a pre-charging resistor, is used for bidirectional conversion of high-voltage direct current and low-voltage direct current, the bidirectional power conversion module (3) supports bidirectional energy transmission of a vehicle-to-power grid, an external load of the vehicle and the vehicle-to-vehicle, an overcurrent, overvoltage and overtemperature protection element is arranged in the bidirectional power conversion module, and loop on-off is controlled by the intelligent battery management system (4).
  3. 3. The vehicle-mounted electric vehicle charging and discharging battery pack according to claim 1, wherein the intelligent battery management system (4) adopts a two-way independent sampling architecture, respectively collects the single voltage, the total voltage, the charging and discharging current and the cell temperature data of the main energy storage module (1) and the auxiliary charging and discharging module (2) in real time, and is internally provided with an equalization control unit and a power distribution unit for equalizing the dynamic electric quantity of the cross-module and eliminating the single cell pressure difference, and simultaneously, the output power of the main and auxiliary modules is automatically distributed according to the working condition of the whole vehicle, the auxiliary charging and discharging module is started under the high-power working condition to cooperatively supply power, and the recovered electric energy is preferentially stored in the auxiliary charging and discharging module (2) during braking.
  4. 4. The vehicle-mounted electric vehicle charging and discharging battery pack according to claim 1, wherein the mechanical protection shell (6) is made of high-strength aluminum alloy, the interior of the mechanical protection shell (6) is divided into a plurality of independent cavities, an upper top plate (601) is fixedly arranged at the top of the mechanical protection shell (6), the main energy storage module (1) is contained in the left side of the interior of the mechanical protection shell (6), and the auxiliary charging and discharging module (2) is contained in the right side of the interior of the mechanical protection shell (6).
  5. 5. The vehicle-mounted electric vehicle charging and discharging battery pack according to claim 1, wherein a socket is formed in the front side of the mechanical protection shell (6), a mounting block (603) is mounted on the outer side of the socket and the front end face of the mechanical protection shell (6), two telescopic rods are mounted on opposite faces of the mounting block (603), and a first clamping plate (6021) and a second clamping plate (6022) are fixedly connected to the moving end of each telescopic rod.

Description

Vehicle-mounted electric vehicle charging and discharging battery pack Technical Field The invention relates to the technical field of batteries of electric vehicles, in particular to a vehicle-mounted electric vehicle charging and discharging battery pack. Background The existing pure electric automobile power battery PACK generally adopts an integrated PACK structure with integrated and fixed packaging of battery cells in series-parallel connection, can only realize unidirectional discharge energy supply, and drives a vehicle to run by means of inversion power supply of a whole vehicle motor controller, but has certain defects in practical use and technical performance: Firstly, the battery pack has a single function, can only realize energy storage and discharge of vehicles, cannot realize bidirectional energy interaction of vehicles to a power grid, vehicles to loads and vehicles to vehicles, has low energy utilization rate, cannot meet diversified use requirements of emergency power supply and the like, secondly, the internal battery cores and modules of the traditional battery pack are closely arranged, when faults such as short circuit and overheating occur in single battery core, heat is extremely easy to conduct and diffuse, chain thermal runaway is caused, safety accidents such as ignition and explosion are caused, thirdly, when the battery cores are subjected to attenuation exceeding standard, local damage and the like due to an integral packaging structure, a battery pack is required to be replaced integrally, the maintenance cost is extremely high, the retired battery is difficult to recover and disassemble, joints are easy to fall off, in addition, the battery core activity is greatly reduced in a low-temperature environment, the internal resistance of the battery is increased, the charge and discharge efficiency is greatly reduced, the mileage is seriously reduced, and under high-speed driving and climbing and other high-power working conditions, the battery load is greatly increased, the energy consumption is increased, the aging and attenuation of the battery core is accelerated, and the overall service life is shortened. Disclosure of Invention The invention provides a vehicle-mounted electric vehicle charging and discharging battery pack, which solves the problems of single function, insufficient safety protection performance, high maintenance cost, poor working condition applicability and easy falling of a plug interface of the battery pack. The first aspect of the disclosure provides a vehicle-mounted electric vehicle charge-discharge battery pack, which comprises a main energy storage module, an auxiliary charge-discharge module, a bidirectional power conversion module, an intelligent battery management system, an isolated thermal management system, a mechanical protection shell and a high-voltage electric loop, wherein the main energy storage module is formed by connecting high-energy-density lithium iron phosphate battery cells in series and is responsible for basic power supply and conventional energy storage of a whole vehicle, stable power is output and meets daily endurance requirements, the auxiliary charge-discharge module is formed by connecting high-power-density lithium battery cells in parallel and is responsible for peak power compensation, braking energy recovery and bidirectional charge-discharge interaction, high-power working condition loads are shared, the charge-discharge response speed is improved, the main energy storage module and the auxiliary charge-discharge module are of independent packaging structures, quick plug-in conductive connectors and positioning buckles are arranged on the outer sides of the modules, quick detachable connection between the mechanical and electric modules is realized, the single module can be detached, maintenance and replacement are not needed to disassemble the whole battery pack, an aerogel heat insulation cushion layer and an independent pressure release channel are arranged between the modules, heat conduction between the modules is blocked, the modules is communicated with the outside of the shell, and the high-temperature gas can be discharged out of the thermal runaway after the fault is in a linkage manner. Further, the bidirectional power conversion module integrates a bidirectional DC/DC converter, a high-voltage relay, a fuse and a precharge resistor, realizes bidirectional conversion of high-voltage direct current and low-voltage direct current, and has the functions of loop on-off and overcurrent protection, not only can receive electric energy of an external power grid and a charging pile to charge a battery pack, but also can reversely output the electric energy of the battery pack to the power grid to participate in peak shaving and frequency modulation of the power grid, earn benefits, and can reversely output the electric energy of the battery pack to an external load, the battery pack is used as a mobile power supp