News Column

Researchers Submit Patent Application, "Electricity Supply System", for Approval

August 6, 2014



By a News Reporter-Staff News Editor at Electronics Newsweekly -- From Washington, D.C., VerticalNews journalists report that a patent application by the inventors TONG, Zhiwei (Shenzhen, CN); ZHU, Jianhua (Shenzhen, CN); LU, Zhipei (Shenzhen, CN); LAI, Qing (Shenzhen, CN), filed on January 28, 2014, was made available online on July 24, 2014.

The patent's assignee is Byd Company Limited.

News editors obtained the following quote from the background information supplied by the inventors: "One of core components of an electric vehicle is battery. Some electric vehicles use lithium ion batteries. Performance of a lithium ion battery is generally poor at a low temperature. Thus, it is required to heat the lithium ion battery. An electric vehicle battery heating system has become a technical challenge. An in-series IGBT (insulated gate bipolar transistor) heating is one of conventional methods for heating an electric vehicle battery.

"Because electric vehicle batteries are mostly configured in series to form a battery pack, for the IGBT heating, the IGBT is connected with the battery pack in series, and the battery pack is heated via a pulse current which is generated by an instant short circuit of the entire battery pack. If a performance of the battery is poor, a pulse short circuit current may not be overlarge (for instance, less than 3000A) because of a large resistance of the battery, thus an entire pack in-series IGBT heating is feasible. However, with an improvement of the performance of the battery, the resistance of the battery is greatly decreased so that the pulse short circuit current of a hybrid vehicle battery pack may be 5000A, and that of a pure electric vehicle battery pack may be 7000A, which are too large for the IGBT, a fuse plug and the battery itself.

"In addition, on one hand, because the battery pack generally includes hundreds of batteries connected in series, a non-uniform discharge of each single battery may be caused during a repeated charge-discharge process, which may cause a capacity loss of the battery pack; and on the other hand, for the in-series IGBT heating, a discharge difference may be caused because of different battery groups, thus a voltage difference of the battery pack may be caused accordingly."

As a supplement to the background information on this patent application, VerticalNews correspondents also obtained the inventors' summary information for this patent application: "The present disclosure is aimed to solve at least one of the problems, particularly a defect of an overlarge current, which may cause a life loss of a battery, electronic devices, and components, in a conventional in-series IGBT heating process. Accordingly, an electricity supply may need to be provided, which may realize heating in batches and avoid the overlarge current.

"According to an embodiment of the present disclosure, an electricity supply system is provided. The electricity supply system comprises: a battery module, a control module, and a distribution box. The battery module includes at least two in-series modules, each in-series module comprising at least two battery groups connected in series. The control module is connected with the battery module and includes: an IGBT module, a relay module, and a relay control module. The relay module includes a plurality of relays, in which each in-series module is connected to the relay module, and the relay module is connected to the IGBT module. The relay control module is configured for controlling an ON or OFF of each relay so as to select an in-series module to work with the IGBT module. The distribution box is connected with the control module.

"In one embodiment, the battery module comprises: one first battery group connected with the distribution box via a first relay which is connected with the first battery group in series; a plurality of middle battery groups, each middle battery group connected with the distribution box via a second relay which is connected with the each middle battery group in series, and connected with the IGBT module via a third relay which is connected with the middle battery group in series; and one last battery group connected with the IGBT module via a fourth relay which is connected with the last battery group in series, in which the first battery group, the plurality of middle battery groups and the last battery group belong to the at least two in-series modules, the IGBT module is connected with the distribution box, and two adjacent in-series modules are connected via a fifth relay.

"In one embodiment, each in-series module comprises two battery groups connected in series.

"In one embodiment, the relay includes an electromagnetic relay.

"In one embodiment, the relay control module includes a single-chip microcomputer.

"According to an embodiment of the present disclosure, a method for heating a battery group is provided. The method for heating a battery group comprises: configuring a battery module to comprise at least two in-series modules, wherein each of the at least two in-series modules comprises at least two battery groups connected in series; configuring a control module comprising an IGBT module, a relay module and a relay control module, wherein the relay module is configured to comprise a plurality of relays, each in-series module is connected to the relay module, and the relay module is connected to the IGBT module, the relay control module is configured to control an ON or OFF of each relay so as to select an in-series module to work with the IGBT module; and configuring a distribution box to connect with the IGBT module and the relay module respectively.

"In one embodiment, the battery module is configured to comprise: one first battery group connected with the distribution box via a first relay which is connected with the first battery group in series; a plurality of middle battery groups, each middle battery group connected with the distribution box via a second relay which is connected with the each middle battery group in series, and connected with the IGBT module via a third relay which is connected with the middle battery group in series; and one last battery group connected with the IGBT module via a fourth relay which is connected with the last battery group in series, in which the first battery group, the plurality of middle battery groups and the last battery group belong to the at least two in-series modules, the IGBT module is connected with the distribution box, and two adjacent in-series modules are connected via a fifth relay.

"In one embodiment, the method comprises: connecting an in-series module having a maximum voltage and an in-series module having a minimum voltage in parallel so as to realize an equilibrium of voltage.

"In one embodiment, each in-series module is configured to comprise a first battery group and a second battery group connected in series.

"In one embodiment, the method comprises: configuring a relay control module to control an ON or OFF of each relay so as to connect a first battery group in a first in-series module to the distribution box directly and to connect a second battery group in the first in-series module to the distribution box via the IGBT module.

"In one embodiment, the method comprises: configuring a relay control module to control an ON or OFF of each relay so as to connect a first battery group in a first in-series module to the distribution box directly, and to connect a second battery group in a second in-series module to the distribution box via the IGBT module, wherein the first battery group in the first in-series module, a second battery group in the first in-series module, a first battery group in the second in-series module and the second battery group in the second in-series module are connected in series.

"In one embodiment, the relay is an electromagnetic relay.

"In one embodiment, the relay control module is a single-chip microcomputer.

"Compared with a conventional entire pack in-series IGBT heating system, the electricity supply system and the method for heating a battery group provided by the present disclosure have advantages as follows.

"(1) The electricity supply system may realize heating battery groups in batches, thus, a maximum current may retain ranging from 2500A to 3000A, which may not damage performances of the battery itself and other electronic devices and components.

"(2) The electricity supply system may realize an equilibrium of voltage between battery groups, and a parallel equilibrium voltage between a high voltage battery group and a low voltage battery group.

"Additional aspects and advantages of the embodiments of the present disclosure will be given in part in the following descriptions, become apparent in part from the following descriptions, or be learned from the practice of the embodiments of the present disclosure.

BRIEF DESCRIPTION OF THE DRAWINGS

"These and other aspects and advantages of the disclosure will become apparent and more readily appreciated from the following descriptions taken in conjunction with the drawings in which:

"FIG. 1 is a block diagram showing an electricity supply system according to an embodiment of the present disclosure;

"FIG. 2 is a schematic diagram showing a connection of in-series modules according to an embodiment of the present disclosure;

"FIG. 3 is a schematic diagram showing a connection of a battery module and a control module according to an embodiment of the present disclosure;

"FIG. 4 is a schematic diagram showing a structure of the battery module according to an embodiment of the present disclosure; and

"FIG. 5 is a schematic diagram showing a structure of the control module according to an embodiment of the present disclosure."

For additional information on this patent application, see: TONG, Zhiwei; ZHU, Jianhua; LU, Zhipei; LAI, Qing. Electricity Supply System. Filed January 28, 2014 and posted July 24, 2014. Patent URL: http://appft.uspto.gov/netacgi/nph-Parser?Sect1=PTO2&Sect2=HITOFF&u=%2Fnetahtml%2FPTO%2Fsearch-adv.html&r=4101&p=83&f=G&l=50&d=PG01&S1=20140717.PD.&OS=PD/20140717&RS=PD/20140717

Keywords for this news article include: Electronics, Electromagnet, Byd Company Limited.

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Source: Electronics Newsweekly


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