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CN-122026297-A - High-voltage direct-current input battery testing system and method

CN122026297ACN 122026297 ACN122026297 ACN 122026297ACN-122026297-A

Abstract

The invention relates to a high-voltage direct-current input battery test system and a method. The high-voltage direct current input battery test system comprises a centralized energy storage module and a plurality of distributed test modules, wherein the centralized energy storage module and the distributed test modules are connected to a direct current input power supply, each distributed test module comprises a plurality of high-power isolation conversion units, the high-power isolation conversion units are respectively connected with the direct current input power supply to form mutually independent distributed high-voltage direct current buses in the distributed test modules, and the distributed high-voltage direct current buses are respectively connected with corresponding batteries to be tested and are used for testing the electrical properties of the batteries to be tested.

Inventors

  • XUAN LIXIN
  • WANG JING

Assignees

  • 苏州新能先锋检测科技有限公司
  • 昆山新能先锋能源科技有限公司
  • 昆山新能先锋能源科技有限公司北京分公司

Dates

Publication Date
20260512
Application Date
20260415

Claims (10)

  1. 1. The high-voltage direct-current input battery test system is characterized by comprising a centralized energy storage module and a plurality of distributed test modules, wherein the centralized energy storage module and the distributed test modules are connected to a direct-current input power supply; Each distributed test module comprises a plurality of high-power isolation conversion units, the high-power isolation conversion units are respectively connected with the direct current input power supply to form mutually independent distributed high-voltage direct current buses in the distributed test modules, and the distributed high-voltage direct current buses are respectively connected with corresponding tested batteries and are used for testing the electrical properties of the tested batteries.
  2. 2. The hvth input battery test system of claim 1, wherein each of the distributed test modules further comprises: The input end of each medium-power non-isolated conversion unit is selectively and electrically connected with the output end of at least one high-power isolated conversion unit through a corresponding switch unit so as to acquire electric energy from different high-power isolated conversion units and convert the accessed electric energy and then output the electric energy.
  3. 3. The hvth input battery test system of claim 2, wherein each of the distributed test modules further comprises: Each distributed energy storage unit is electrically connected with the distributed high-voltage direct current bus through a corresponding medium-power non-isolated conversion unit and is used for storing and releasing energy of the distributed high-voltage direct current bus so as to realize dynamic adjustment of electric energy.
  4. 4. The hvth input battery test system of claim 3, wherein each of the distributed test modules further comprises: and the distributed energy storage controller is connected with the plurality of distributed energy storage units and is used for adjusting the charging and discharging processes of the distributed energy storage units so as to realize the voltage stabilization and energy balance of the distributed high-voltage direct current bus.
  5. 5. The hvth input battery test system of claim 1, wherein each of the distributed test modules further comprises: and the isolation conversion controller is connected with the plurality of high-power isolation conversion units and used for controlling the working states of the plurality of high-power isolation conversion units so as to regulate the output of the corresponding distributed high-voltage direct current bus.
  6. 6. The hvth input battery test system of claim 1, wherein each of the distributed test modules further comprises: And the input end of each direct current conversion unit is connected with a corresponding distributed high-voltage direct current bus, the output end of each direct current conversion unit is connected with a corresponding battery to be tested, and the direct current conversion units are used for establishing an electric energy conversion passage between the distributed high-voltage direct current bus and the battery to be tested and controlling the charging and discharging of the battery to be tested.
  7. 7. The hvth input battery test system of claim 6, wherein each of the distributed test modules further comprises: And the direct current conversion controller is connected with the plurality of direct current conversion units and used for controlling the working states of the plurality of direct current conversion units so as to adjust the charge and discharge voltage and current of the corresponding battery to be tested.
  8. 8. The high voltage dc input battery test system of claim 1, wherein the centralized energy storage module comprises: the input end of the high-power non-isolation conversion unit is connected with a direct-current input power supply and is used for carrying out electric energy conversion on the direct-current input power supply; The centralized energy storage unit is connected with the high-power non-isolated conversion unit and is used for storing and releasing electric energy; and the centralized energy storage controller is respectively connected with the high-power non-isolated conversion unit and the centralized energy storage unit, and is used for controlling the working state of the high-power non-isolated conversion unit and regulating the charging and discharging processes of the centralized energy storage unit.
  9. 9. The high voltage dc input battery test system of any one of claims 4-8, further comprising: And the master controller is respectively connected with the centralized energy storage controller, the isolation transformation controller, the direct current transformation controller and the distributed energy storage controller, and is used for receiving the running state information of the centralized energy storage controller, the isolation transformation controller, the direct current transformation controller and the distributed energy storage controller and sending control instructions to the controllers so as to coordinate the electric energy distribution and the power dispatching between the distributed test modules and the centralized energy storage module.
  10. 10. A method for testing a high voltage dc input battery as claimed in any one of claims 1 to 9, comprising: connecting the centralized energy storage module and the plurality of distributed test modules to a direct current input power supply; In each distributed test module, the direct current input power supply is respectively subjected to isolation transformation through a plurality of high-power isolation transformation units so as to form a plurality of mutually independent distributed high-voltage direct current buses; Connecting each distributed high-voltage direct current bus with a corresponding battery to be tested respectively; and based on the distributed high-voltage direct current bus, testing the electrical performance of the corresponding tested battery.

Description

High-voltage direct-current input battery testing system and method Technical Field The invention relates to the technical field of battery testing, in particular to a battery testing system and method for high-voltage direct current input. Background With the rapid development of the fields of electric automobiles, electrochemical energy storage systems and the like, battery monomers and battery systems are continuously improved in the aspects of power density, output power, voltage level and the like, and correspondingly, higher requirements are put forward on battery test equipment in the aspects of voltage level, power capacity, system reliability and the like. Particularly, in the research, production and application processes of the high-voltage high-power battery, the testing equipment is required to cover higher voltage and power ranges, and also is required to maintain good energy utilization efficiency and stability under long-term running conditions, so that the testing equipment is suitable for testing requirements of multi-battery parallel testing, energy feedback and complex working conditions. The existing high-voltage high-power battery test equipment mostly uses an alternating current power grid as a system input source, and usually converts alternating current electric energy into direct current electric energy through a power frequency or high-frequency isolation transformer matched with an alternating current-direct current conversion circuit and then is connected with a battery to be tested. The scheme has the problems of multiple conversion links and complex system structure, and the energy interaction between different test units often needs to be transmitted by multi-stage electric energy conversion and depends on an alternating current power grid with low voltage level, so that the loop loss is larger. Meanwhile, the system is limited by a power frequency isolation transformer or a centralized complete machine framework, the equipment is large in size and weight, the flexibility of installation and arrangement is limited, and the problems of common-mode loops, energy circulation and the like are easily introduced when the number of test channels is expanded, so that the stability and the configuration flexibility of the system are adversely affected. Disclosure of Invention In order to solve the technical problems, a first aspect of the present invention provides a battery test system for high-voltage dc input, the system comprising a centralized energy storage module and a plurality of distributed test modules, wherein the centralized energy storage module and the plurality of distributed test modules are both connected to a dc input power supply; Each distributed test module comprises a plurality of high-power isolation conversion units, the high-power isolation conversion units are respectively connected with the direct current input power supply to form mutually independent distributed high-voltage direct current buses in the distributed test modules, and the distributed high-voltage direct current buses are respectively connected with corresponding tested batteries and are used for testing the electrical properties of the tested batteries. Optionally, each of the distributed test modules further includes: The input end of each medium-power non-isolated conversion unit is selectively and electrically connected with the output end of at least one high-power isolated conversion unit through a corresponding switch unit so as to acquire electric energy from different high-power isolated conversion units and convert the accessed electric energy and then output the electric energy. Optionally, each of the distributed test modules further includes: Each distributed energy storage unit is electrically connected with the distributed high-voltage direct current bus through a corresponding medium-power non-isolated conversion unit and is used for storing and releasing energy of the distributed high-voltage direct current bus so as to realize dynamic adjustment of electric energy. Optionally, each of the distributed test modules further includes: and the distributed energy storage controller is connected with the plurality of distributed energy storage units and is used for adjusting the charging and discharging processes of the distributed energy storage units so as to realize the voltage stabilization and energy balance of the distributed high-voltage direct current bus. Optionally, each of the distributed test modules further includes: and the isolation conversion controller is connected with the plurality of high-power isolation conversion units and used for controlling the working states of the plurality of high-power isolation conversion units so as to regulate the output of the corresponding distributed high-voltage direct current bus. Optionally, each of the distributed test modules further includes: And the input end of each direct current conversion unit is connected with a corres