CN213210401U - Electric performance detection system for lightweight flexible battery - Google Patents
Electric performance detection system for lightweight flexible battery Download PDFInfo
- Publication number
- CN213210401U CN213210401U CN202021980274.9U CN202021980274U CN213210401U CN 213210401 U CN213210401 U CN 213210401U CN 202021980274 U CN202021980274 U CN 202021980274U CN 213210401 U CN213210401 U CN 213210401U
- Authority
- CN
- China
- Prior art keywords
- electric energy
- converter
- direct
- voltage
- bus
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Landscapes
- Secondary Cells (AREA)
Abstract
The utility model provides a simple structure, small lightweight flexible battery electrical property detecting system who has high performance, high stability and high reliability simultaneously. The utility model comprises a direct current bus (1) arranged in the system, an AC/DC converter (2) arranged between the direct current bus and an external alternating current network, and at least one high-frequency isolation DC/DC converter (4) arranged between the direct current bus and a battery pack (3) to be tested; the AC/DC converter converts alternating current electric energy of an external alternating current power grid into high-voltage direct current electric energy to be input to the direct current bus, or converts direct current electric energy of the direct current bus into alternating current electric energy to be fed back to the external alternating current power grid; the high-frequency isolation DC/DC converter converts the high-voltage direct-current electric energy of the direct-current bus into variable direct-current voltage and outputs the variable direct-current voltage to the battery pack to be tested, or converts the direct-current electric energy of the battery pack to be tested into high-voltage direct-current electric energy and feeds the high-voltage direct-current electric energy back to the direct-current bus. The utility model is used for the detection area.
Description
Technical Field
The utility model relates to a detection area especially relates to a lightweight flexible battery electrical property detecting system.
Background
The consideration of the safety of the power battery is always the first place from the concept of new energy automobiles, particularly electric automobiles, to the practical popularization and application for more than ten years. However, in the application process of automobiles, the spontaneous combustion of not less than 20 new energy vehicles is reported. This phenomenon occurs mainly in the performance of power batteries in three aspects — electrical performance (cell consistency, cycle life, operating temperature rise, self-discharge, etc.), physical performance (airtightness, collision, etc.), and reliability of battery management systems (EMS). The evaluation and inspection of the electrical performance of the power battery is the most important link, and is directly related to the use safety of the electric automobile.
For example, chinese patent publication No. CN206041594U discloses a common dc bus type power battery performance detection device. In the description of the document, the common DC bus type power battery performance detection device includes a power frequency isolation transformer for receiving power from a power grid, a bidirectional AC-DC converter connected to an output end of the power frequency isolation transformer, and a plurality of bidirectional DC/DC direct current channels, an output end of the bidirectional AC-DC converter is connected to a common DC bus inside the device, one end of each of the plurality of bidirectional DC/DC direct current channels is connected to the common DC bus, and the other end of each of the plurality of bidirectional DC/DC direct current channels is connected to a power battery to be detected. Although the disclosed solution has various excellent characteristics, the following disadvantages exist in practical applications: if the direct current channels can only be used in parallel, but can not be used in series through the direct current channels, the direct current output voltage is improved; meanwhile, the detection equipment adopts a power frequency isolation transformer, which plays the roles of isolation and voltage regulation in the equipment, but the power frequency transformer has large volume and heavy weight (2.5 tons of 480kW transformer for 750V600A equipment), which causes heavy system and consumes a large amount of copper and iron resources.
SUMMERY OF THE UTILITY MODEL
The utility model aims to solve the technical problem that overcome prior art not enough, provide a simple structure, small lightweight flexible battery electrical property detecting system who has high performance, high stability and high reliability simultaneously.
The utility model adopts the technical proposal that: the utility model discloses a set up in the inside direct current generating line of system, this system still includes
An AC/DC converter arranged between the DC bus and an external AC network, an
At least one path of high-frequency isolation DC/DC converter arranged between the direct current bus and the battery pack to be tested;
the AC/DC converter converts the alternating current electric energy of an external alternating current power grid into high-voltage direct current electric energy to be input into the direct current bus, or converts the direct current electric energy of the direct current bus into alternating current electric energy to be fed back to the external alternating current power grid,
the high-frequency isolation DC/DC converter converts the high-voltage direct-current electric energy of the direct-current bus into variable direct-current voltage and outputs the variable direct-current voltage to the battery pack to be tested, or converts the direct-current electric energy of the battery pack to be tested into high-voltage direct-current electric energy and feeds the high-voltage direct-current electric energy back to the direct-current bus.
Above-mentioned scheme is visible, compares with prior art, keeps apart original power frequency transformer and changes the mode into high frequency isolation, and the direct current side converts traditional non-isolated type step-up step-down mode circuit into the two-way DC/DC mode of isolation, and the transformation of this kind of mode, each function and the characteristics of original detecting system of intact reservation still have following advantage: the volume and the weight of the system are greatly reduced, and the power density of the system is improved; through the arrangement of the high-frequency isolation DC/DC converter, each direct current channel can work in parallel and also can work in series; the direct current channel (DC/DC) can be standardized and produced in mass, and the universality is stronger; the raw material purchasing cost and the manufacturing cost are saved, and the market competitiveness is improved; therefore, the electric performance detection system of the light flexible battery, which has the advantages of simple structure, small size, high performance, high stability and high reliability, is provided.
Further, the AC/DC converter comprises a power frequency reactor and a three-phase half-bridge converter which are sequentially connected, wherein the power frequency reactor obtains alternating current electric energy from an external alternating current power grid, and the three-phase half-bridge converter converts the alternating current electric energy into high-voltage direct current electric energy to be output to the direct current bus. Compared with the prior art, the AC/DC converter composed of the power frequency reactor and the three-phase half-bridge converter can obtain alternating current electric energy from an external alternating current power grid and convert the alternating current electric energy into internal high-voltage direct current electric energy, can maintain the stability of the direct current bus and keep the stability and reliability of the direct current bus.
Still further, the three-phase half-bridge converter is composed of IGBT devices. Therefore, the three-phase half-bridge converter formed by the IGBT devices can realize the characteristics of high voltage and low current, so that the requirements of specific working conditions are met.
In addition, the high-frequency isolation DC/DC converter comprises a first converter unit, a high-frequency isolation transformer and a second converter unit which are sequentially connected, wherein one side of the first converter unit is connected with the direct-current bus, and one side of the second converter unit is connected with the battery pack to be tested. Therefore, the first converter unit converts the high-voltage direct-current electric energy into the high-frequency switching signal, the second converter unit converts the electric energy fed back by the battery pack to be tested into the high-frequency switching signal, and further the high-efficiency conversion of the electric energy between the direct-current bus and the battery pack to be tested is realized.
Further, the first converter cell is composed of a silicon carbide power device. The second converter unit is composed of a silicon carbide power device, a general IGBT or a general MOS tube. Therefore, the silicon carbide power device is adopted, the low-loss characteristic of the silicon carbide device is fully utilized, the high efficiency of electric energy conversion is ensured, the size of a heat dissipation system of the power conversion unit is further reduced, the power density of the system effect is improved, the modular design of the direct current unit is facilitated, the mass production is facilitated, and the production cost is further saved.
Drawings
Fig. 1 is a simple schematic diagram of the present invention.
Detailed Description
As shown in fig. 1, the present invention includes a dc bus 1 disposed inside the system. The system also includes
An AC/DC converter 2 arranged between the DC bus 1 and an external AC network, an
At least one path of high-frequency isolation DC/DC converter 4 arranged between the direct current bus 1 and the battery pack 3 to be tested;
the AC/DC converter 2 converts alternating current electric energy of an external alternating current power grid into high-voltage direct current electric energy to be input to the direct current bus 1, or converts direct current electric energy of the direct current bus 1 into alternating current electric energy to be fed back to the external alternating current power grid, the high-frequency isolation DC/DC converter 4 converts the high-voltage direct current electric energy of the direct current bus 1 into variable direct current voltage to be output to the battery pack 3 to be tested, or converts the direct current electric energy of the battery pack 3 to be tested into high-voltage direct current electric energy to be fed back to the direct current bus 1.
The AC/DC converter 2 comprises a power frequency reactor 21 and a three-phase half-bridge converter 22 which are sequentially connected, wherein the power frequency reactor 21 obtains alternating current electric energy from an external alternating current power grid, and the three-phase half-bridge converter 22 converts the alternating current electric energy into high-voltage direct current electric energy to be output to the direct current bus 1. The three-phase half-bridge converter 22 is composed of IGBT devices. In this embodiment, the IGBT device is an IGBT module packaged by an english-flying 1200V 62mm package.
The high-frequency isolation DC/DC converter 4 comprises a first converter unit 41, a high-frequency isolation transformer 42 and a second converter unit 43 which are sequentially connected, one side of the first converter unit 41 is connected with the direct-current bus 1, and one side of the second converter unit 43 is connected with the battery pack 3 to be tested. The first converter unit 41 converts high-voltage direct-current electric energy into a high-frequency switching signal and inputs the high-frequency switching signal to the high-frequency isolation transformer 42, the second converter unit 43 converts the high-frequency switching signal output by the high-frequency isolation transformer 42 into variable direct-current voltage to supply to the battery pack 3 to be tested, or the second converter unit 43 converts electric energy fed back by the battery pack 3 to be tested into a high-frequency switching signal and inputs the high-frequency switching signal to the high-frequency isolation transformer 42, and the first converter unit 41 converts the high-frequency switching signal output by the high-frequency isolation transformer 42 into variable high-voltage direct-current electric energy to supply to the direct.
The first converter unit 41 is formed of a silicon carbide power device. The second converter unit 43 is composed of a silicon carbide power device, a general IGBT, or a general MOS transistor. In this embodiment, the first converter unit 41 is a silicon carbide power device manufactured by the british flying company; the second converter unit 43 adopts silicon carbide (high voltage, low current characteristic) or general IGBT or MOSFET according to the different voltage grades of the battery pack to be tested.
The utility model discloses a work flow as follows:
as shown in fig. 1, during charging, the AC/DC converter 2 obtains AC power from the grid and converts the AC power into high-voltage DC power of the internal DC bus. The AC/DC converter mainly keeps the DC bus inside the system stable (which can be understood as a voltage stabilizer). In the high frequency isolated DC/DC converter 4, the high voltage DC power is converted into a high frequency switching signal by the single phase full bridge converter unit of the first converter unit 41, and then rectified into a variable DC voltage (depending on the battery condition) by the single phase full bridge converter of the second converter unit 43. Specifically, the first converter unit 41 converts the high-voltage dc power into a high-frequency switching signal and inputs the high-frequency switching signal to the high-frequency isolation transformer 42, and the second converter unit 43 converts the high-frequency switching signal output by the high-frequency isolation transformer 42 into a variable dc voltage and supplies the variable dc voltage to the battery pack 3 to be tested. Or, the second converter unit 43 converts the electric energy fed back by the battery pack 3 to be tested into a high-frequency switching signal and inputs the high-frequency switching signal to the high-frequency isolation transformer 42, and the first converter unit 41 converts the high-frequency switching signal output by the high-frequency isolation transformer 42 into variable high-voltage direct-current electric energy to be supplied to the direct-current bus 1.
During discharging, the single-phase full-bridge converter of the second converter unit 43 converts the dc power of the battery pack into a high-frequency switching signal, and then the high-frequency switching signal is transmitted to the full-bridge converter of the first converter unit 41 through the high-frequency isolation transformer, and the high-frequency switching signal is rectified into a dc bus of the system by the full-bridge converter of the first converter unit 41.
When the system works in a multi-channel mode, the high-frequency isolation DC/DC converters 4 can work synchronously or in a time-sharing mode. When the synchronous charging is carried out, the electric energy of the battery pack to be tested is provided by an alternating current power grid; and during synchronous discharge, the battery pack is connected into a power grid after passing through the high-frequency isolation DC/DC converter and the AC/DC converter. When the high-frequency isolation DC/DC converters work asynchronously, if the discharge energy of the battery pack to be tested exceeds the system loss, the system transmits energy to the power grid. Otherwise the system draws energy from the grid.
Compared with the prior art, the volume of the device is reduced by about 1/4 under the same power; the weight of the device at the same power was reduced by about 2/5; the raw material cost is reduced by about 1/4.
Claims (6)
1. The utility model provides a flexible battery electrical property detecting system of lightweight, is including setting up in inside direct current generating line (1) of system, its characterized in that: the system also includes
An AC/DC converter (2) arranged between the DC bus (1) and an external AC network, and
at least one path of high-frequency isolation DC/DC converter (4) arranged between the direct current bus (1) and the battery pack (3) to be tested;
the AC/DC converter (2) converts alternating current electric energy of an external alternating current power grid into high-voltage direct current electric energy to be input into the direct current bus (1), or converts direct current electric energy of the direct current bus (1) into alternating current electric energy to be fed back to the external alternating current power grid,
the high-frequency isolation DC/DC converter (4) converts the high-voltage DC electric energy of the DC bus (1) into variable DC voltage and outputs the variable DC voltage to the battery pack (3) to be tested, or converts the DC electric energy of the battery pack (3) to be tested into high-voltage DC electric energy and feeds the high-voltage DC electric energy back to the DC bus (1).
2. The system for detecting electrical performance of a lightweight flexible battery as in claim 1, wherein: the AC/DC converter (2) comprises a power frequency reactor (21) and a three-phase half-bridge converter (22) which are sequentially connected, wherein the power frequency reactor (21) obtains alternating current electric energy from an external alternating current power grid, and the three-phase half-bridge converter (22) converts the alternating current electric energy into high-voltage direct current electric energy to be output to the direct current bus (1).
3. The system for detecting electrical performance of a lightweight flexible battery as in claim 2, wherein: the three-phase half-bridge converter (22) is composed of IGBT devices.
4. The system for detecting electrical performance of a lightweight flexible battery as in claim 1, wherein: the high-frequency isolation DC/DC converter (4) comprises a first converter unit (41), a high-frequency isolation transformer (42) and a second converter unit (43) which are sequentially connected, one side of the first converter unit (41) is connected with the direct-current bus (1), and one side of the second converter unit (43) is connected with the battery pack (3) to be tested.
5. The system for detecting electrical performance of a lightweight flexible battery as in claim 4, wherein: the first converter cell (41) is formed by a silicon carbide power device.
6. The system for detecting electrical performance of a lightweight flexible battery as in claim 4, wherein: the second converter unit (43) is composed of a silicon carbide power device, a general IGBT or a general MOS tube.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021980274.9U CN213210401U (en) | 2020-09-11 | 2020-09-11 | Electric performance detection system for lightweight flexible battery |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202021980274.9U CN213210401U (en) | 2020-09-11 | 2020-09-11 | Electric performance detection system for lightweight flexible battery |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN213210401U true CN213210401U (en) | 2021-05-14 |
Family
ID=75819869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202021980274.9U Active CN213210401U (en) | 2020-09-11 | 2020-09-11 | Electric performance detection system for lightweight flexible battery |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN213210401U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116224107A (en) * | 2023-03-09 | 2023-06-06 | 北京索英电气技术股份有限公司 | Battery test equipment and related system |
-
2020
- 2020-09-11 CN CN202021980274.9U patent/CN213210401U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116224107A (en) * | 2023-03-09 | 2023-06-06 | 北京索英电气技术股份有限公司 | Battery test equipment and related system |
| CN116224107B (en) * | 2023-03-09 | 2023-11-14 | 北京索英电气技术股份有限公司 | Battery test equipment and related system |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN103236706B (en) | The battery energy storage system of transformation topology is handed over based on modular multilevel | |
| CN102111008A (en) | High-voltage battery charging system architecture of electric automobile | |
| CN104158273A (en) | Battery forming and capacity grading system | |
| CN203800680U (en) | Large power bidirectional deflector capable of supporting access of multiple cell groups | |
| CN210881738U (en) | High-power bidirectional charger | |
| CN102104341B (en) | Single-stage boost inverter | |
| CN213185893U (en) | Bidirectional isolation type DC-DC buck-boost rectification power supply module | |
| CN103138355A (en) | Charge-discharge control system | |
| CN206789649U (en) | A kind of Lithium Polymer Battery Formation System | |
| Fang et al. | Study on bidirectional-charger for electric vehicle applied to power dispatching in smart grid | |
| CN103795132A (en) | Modularization multiport type electric car quick charging station based on high-frequency isolation technology | |
| WO2023093057A1 (en) | Charging module and charging system | |
| CN213210401U (en) | Electric performance detection system for lightweight flexible battery | |
| CN216819454U (en) | Energy storage power module and energy storage system | |
| CN212785198U (en) | Tower type power supply system topological structure | |
| CN202374022U (en) | Charge and discharge control system | |
| CN105652116A (en) | Back-to-back testing circuit based on DC/DC converter | |
| CN115955117B (en) | Direct-current power supply conversion device for bridging new energy power generation, energy storage and micro-grid | |
| CN105449735B (en) | Echelon battery pack maintenance device | |
| CN209191699U (en) | A kind of charger and rail vehicle | |
| Ahn et al. | Implementation of 60-kW fast charging system for electric vehicle | |
| CN217514980U (en) | Charging system suitable for electric vehicle | |
| CN207719888U (en) | A kind of uninterruptible power supply converter circuit | |
| CN106915265B (en) | A kind of topological structure and control method of electric automobile battery charger | |
| CN213937521U (en) | Three-stage topological structure charger with high-low voltage output |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant |