CN212137327U - Device for balancing single battery cell in lithium battery pack - Google Patents
Device for balancing single battery cell in lithium battery pack Download PDFInfo
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- CN212137327U CN212137327U CN202020990850.1U CN202020990850U CN212137327U CN 212137327 U CN212137327 U CN 212137327U CN 202020990850 U CN202020990850 U CN 202020990850U CN 212137327 U CN212137327 U CN 212137327U
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- lithium battery
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- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 title claims abstract description 33
- 229910052744 lithium Inorganic materials 0.000 title claims abstract description 33
- 230000005669 field effect Effects 0.000 claims abstract description 34
- 238000005070 sampling Methods 0.000 claims abstract description 34
- 239000000178 monomer Substances 0.000 claims abstract description 25
- 230000003287 optical effect Effects 0.000 claims abstract description 19
- 230000005611 electricity Effects 0.000 claims description 10
- 230000002093 peripheral effect Effects 0.000 claims description 3
- 238000003860 storage Methods 0.000 abstract description 6
- 238000000034 method Methods 0.000 description 10
- 230000008569 process Effects 0.000 description 6
- 101000908580 Homo sapiens Spliceosome RNA helicase DDX39B Proteins 0.000 description 3
- 102100024690 Spliceosome RNA helicase DDX39B Human genes 0.000 description 3
- 101001068634 Homo sapiens Protein PRRC2A Proteins 0.000 description 2
- 102100033954 Protein PRRC2A Human genes 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- 101000697493 Homo sapiens Large proline-rich protein BAG6 Proteins 0.000 description 1
- 102100028047 Large proline-rich protein BAG6 Human genes 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 239000002253 acid Substances 0.000 description 1
- 238000010923 batch production Methods 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
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Abstract
The utility model relates to a balanced technical field of group battery discloses a device that is arranged in balanced lithium cell group monomer electric core to reduce energy loss, realize the maximum capacity electric power storage, the device include sampling circuit, with sampling circuit connection's processing circuit, with the optical coupler that processing circuit is connected, with the switch field effect transistor that the optical coupler is connected and with the constant voltage power supply who is connected of switch field effect transistor, sampling circuit with treat balanced lithium cell group in monomer electric core be connected.
Description
Technical Field
The utility model relates to a balanced technical field of group battery especially relates to a device that is arranged in balanced lithium cell group monomer electricity core.
Background
The great advantages of lithium batteries compared with lead-acid batteries are generally accepted, and lithium battery packs are more and more popular in the market and in various social fields, however, when the lithium battery packs are applied to occasions requiring frequent charge and discharge cycles such as electric vehicles, the supply voltage needs to be increased by connecting the battery packs in series in order to obtain sufficient system voltage. Imbalance between the series-connected battery cells reduces the effective capacity of the entire battery pack, and can only be placed at the lower limit of the battery cell with the smallest capacity when discharging, otherwise, the battery cell with the smallest capacity may have polarity reversal. When charging in series, the battery with the smallest unit capacity in the battery pack is charged first. If the charging is stopped at the moment, the whole battery pack cannot be fully charged, and the capacity of the battery pack cannot be effectively utilized; some of the cells may be overcharged if charging is continued. Lithium ion batteries do not allow overcharging, and therefore battery pack balancing is more important.
At present, the equalization modes of the series storage battery pack are mainly divided into a passive equalization mode and an active equalization mode. The passive equalization is to convert the electric quantity of the battery unit with high electric quantity into heat through a resistor to be consumed, so as to achieve the purpose of equalization of the battery pack. The method has simple structure and low cost, and is applied to the occasions with small capacity and low power. However, in the case of equalizing a large-capacity battery pack, a large amount of heat is generated during equalization, and the charging efficiency of the battery pack is lowered. The active balancing working principle is to realize the balancing of the battery pack by reasonably transferring the electric energy of the battery units. At present, two methods are generally adopted for transferring electric energy of a battery unit, namely a direct current bus transfer method, voltage of a direct current bus of a battery pack is pumped into the battery unit in a voltage reduction mode or electric energy of the battery unit is pumped into a direct current bus of the battery pack after being boosted through an isolated DC/DC module, and balance is realized through electric energy exchange between the battery unit and the direct current bus of the battery pack. Meanwhile, different circuit parameters need to be designed for battery packs with different voltage grades, the universality of the active equalization circuit is reduced, batch production is not facilitated, and the cost is reduced. And secondly, the electric energy balance circuit among the battery units is used for transferring step by step. Although the step-by-step transfer method is not affected by the total voltage, when the battery pack is connected in series in multiple steps, the number of times of electric energy conversion is large, the energy loss is large, and the balancing efficiency is low. Meanwhile, because the electric energy is transmitted step by step, if one module breaks down, the balance effect of the whole system is obviously reduced, and the reliability of the system is poor.
Therefore, how to reduce energy loss and realize maximum capacity storage becomes a problem to be solved urgently.
SUMMERY OF THE UTILITY MODEL
An object of the utility model is to provide a device that is arranged in balanced lithium cell group monomer electricity core to reduce energy loss, realize the maximum capacity electric power storage.
To achieve the above object, the present invention provides a device for equalizing cell cores in a lithium battery pack, including:
the sampling circuit, with the processing circuit that sampling circuit connects, with the optical coupler that processing circuit connects, with the switch field effect transistor that the optical coupler is connected and with the constant voltage power supply that the switch field effect transistor is connected, the sampling circuit is connected with the monomer electricity core in treating balanced lithium cell group.
Preferably, the sampling circuit includes: first sampling resistor and second sampling resistor, the one end of first sampling resistor is connected with the positive pole of the monomer electricity core that awaits measuring, the other end of first sampling resistor with the one end of second sampling resistor is connected, the other end ground connection of second sampling resistor, the other end of first sampling resistor still with processing circuit connects, the negative pole of the monomer electricity core that awaits measuring and the positive pole of all the other monomer electricity cores in the lithium cell group ground connection after establishing ties.
Preferably, the processing circuit comprises a main control chip U1 and related peripheral circuits.
Preferably, the optical coupler further comprises a third resistor, one end of the third resistor is connected with the processing circuit, and the other end of the third resistor is connected with the optical coupler.
Preferably, the number of the switching field effect transistors is two, the switching field effect transistors are respectively a first switching field effect transistor and a second switching field effect transistor, and a grid electrode of the first switching field effect transistor and a grid electrode of the second switching field effect transistor are connected in parallel and then connected with the optical coupler. The source electrode of the second switch field effect transistor is grounded, the drain electrode is connected with the negative electrode of the corresponding monomer battery cell, the positive electrode of the corresponding monomer battery cell of the first switch field effect transistor is connected with the external VCC 5V.
Preferably, the lithium battery pack to be tested comprises a plurality of single battery cells, and the single battery cells are connected in series.
The utility model discloses following beneficial effect has:
the utility model provides a pair of a device for balancing in lithium cell group monomer electric core is equipped with the monomer electric core voltage that voltage is the highest in the group battery of sampling circuit sampling to use this monomer electric core voltage Vh as the reference, charge to the monomer electric core that is less than Vh respectively, to every monomer electric core charging process, microprocessor sampling feedback charges the voltage of electric core and controls every electric core voltage and all fills to Vh. Finally, each battery cell can reach Vh consistently, energy loss in the charging process can be reduced, and maximum capacity power storage is realized.
The present invention will be described in further detail below with reference to the accompanying drawings.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this application, are included to provide a further understanding of the invention, and are incorporated in and constitute a part of this specification. In the drawings:
fig. 1 is a schematic structural diagram of an apparatus for equalizing single cell cells in a lithium battery pack according to a preferred embodiment of the present invention;
fig. 2 is a circuit diagram of an apparatus for equalizing the cell sizes in the lithium battery pack according to a preferred embodiment of the present invention.
Detailed Description
The embodiments of the invention will be described in detail below with reference to the drawings, but the invention can be implemented in many different ways as defined and covered by the claims.
As shown in fig. 1, the present embodiment provides an apparatus for equalizing single cell cells in a lithium battery pack, including:
the lithium battery pack balancing device comprises a sampling circuit, a processing circuit connected with the sampling circuit, an optical coupler connected with the processing circuit, a switching field effect tube connected with the optical coupler and a constant voltage power supply connected with the switching field effect tube, wherein the sampling circuit is connected with a single battery cell in a lithium battery pack to be balanced.
The device for balancing the single battery cells in the lithium battery pack is provided with the sampling circuit for sampling the single battery cell voltage with the highest voltage in the battery pack, the single battery cells lower than Vh are respectively charged by taking the single battery cell voltage Vh as reference, and in the charging process of each single battery cell, the microprocessor samples and feeds back the voltage of the charging battery cell to control each battery cell voltage to be charged to Vh. Finally, each battery cell can reach Vh consistently, energy loss in the charging process can be reduced, and maximum capacity power storage is realized.
In this embodiment, the sampling circuit includes: the negative pole of the monomer electric core to be tested is connected with the positive pole of the rest monomer electric cores in the lithium battery pack in series and then is grounded.
In this embodiment, the processing circuit includes a main control chip U1 and related peripheral circuits. Specifically, in this embodiment, the main control chip U1 adopts an STM32F10 series 32-bit single chip Microcomputer (MCU). As a changeable implementation manner, in other possible embodiments, the main control chip U1 may also adopt other types of single-chip Microcomputers (MCUs) capable of implementing the same functions in the circuit.
Preferably, the device further comprises a third resistor, one end of the third resistor is connected with the processing circuit, and the other end of the third resistor is connected with the optical coupler.
In this embodiment, each single battery cell includes two switching field effect transistors, which are a first switching field effect transistor and a second switching field effect transistor, and a gate of the first switching field effect transistor (e.g., T1) and a gate of the second switching field effect transistor (e.g., T13) are connected in parallel and then connected to the optical coupler. The source of the second switching fet (e.g., T13) is grounded, and the drain is connected to the negative electrode of the corresponding cell (e.g., BAT 16). The positive electrode and the drain electrode of a corresponding monomer battery cell (such as BAT16) of the first switch field effect transistor (such as T1) are connected with the external VCC 5V.
It should be noted that the lithium battery pack to be tested includes a plurality of single battery cells, and the single battery cells are connected in series. In this embodiment, 16 unit cells are connected in series, which are BAT1, BAT2, and BAT3 … … BAT16, respectively. Specifically, as shown in fig. 2, the 5V _ INPUT constant voltage power supply for charging can flexibly configure the power supply power according to the capacity of the cell.
In fig. 2, after the lithium battery pack is connected, the main control chip U1 of the processing circuit samples the voltage of each battery cell through the ADC _ BUS after initialization, and compares the highest voltage Vh. To better illustrate the principle, the highest cell voltage at this time is assumed to be BAT 1. The U1 outputs high level on the corresponding line end of the DRIV _ BUS BUS to drive the field effect transistor T1 and T13 to be conducted through the optical coupler OP19, and then the pin PC12 of the U1 outputs high level to drive the field effect transistor T43 to be conducted through the optical coupler OP23 to be connected with the power supply 5V _ INPUT, so that the BAT16 is charged. In the charging process, the U1 continuously samples BAT16 battery voltage to control the charging time in a feedback mode until the voltage of BAT1 reaches Vh, and outputs low level to firstly turn off T43, T1 and T13, so that the charging of BAT16 is completed.
Further, the U1 outputs high level on the DRIV _ BUS corresponding to the line end and drives the FET T3 and T39 to be conducted through the optical coupler OP20, and then the PC12 of the U1 outputs high level and drives the FET T43 to be conducted through the optical coupler OP23 to be connected with the power supply 5V _ INPUT, so that the BAT15 is charged. In the charging process, the U1 continuously samples BAT1 battery voltage to control the charging time in a feedback mode until the voltage of BAT15 reaches Vh, and outputs low level to firstly turn off T43, T3 and T39, so that the charging of BAT15 is completed. Sequentially and circularly charging BAT14 and BAT13 … BAT2 respectively. And the whole battery pack is balanced.
It should be noted that, this embodiment is only described as an example, and as an alternative embodiment, in another embodiment, a lithium battery pack formed by connecting 15, 14 or another number of single battery cells in series may also be used for equalizing charge.
The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention, and various modifications and changes may be made by those skilled in the art. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the protection scope of the present invention.
Claims (6)
1. An apparatus for equalizing individual cells in a lithium battery pack, comprising:
the sampling circuit, with the processing circuit that sampling circuit connects, with the optical coupler that processing circuit connects, with the switch field effect transistor that the optical coupler is connected and with the constant voltage power supply that the switch field effect transistor is connected, the sampling circuit is connected with the monomer electricity core in treating balanced lithium cell group.
2. The apparatus for equalizing single cells in a lithium battery pack according to claim 1, wherein the sampling circuit comprises: first sampling resistor and second sampling resistor, the one end of first sampling resistor is connected with the positive pole of the monomer electricity core that awaits measuring, the other end of first sampling resistor with the one end of second sampling resistor is connected, the other end ground connection of second sampling resistor, the other end of first sampling resistor still with processing circuit connects, the negative pole of the monomer electricity core that awaits measuring and the positive pole of all the other monomer electricity cores in the lithium cell group ground connection after establishing ties.
3. The device for equalizing the single cells in a lithium battery pack according to claim 1, wherein the processing circuit comprises a main control chip U1 and related peripheral circuits.
4. The device for equalizing the cell cores in the lithium battery pack according to claim 1, further comprising a third resistor, wherein one end of the third resistor is connected to the processing circuit, and the other end of the third resistor is connected to the optical coupler.
5. The device for equalizing the monomer cells in the lithium battery pack according to claim 1, wherein the number of the switching field effect transistors is two, and the switching field effect transistors are respectively a first switching field effect transistor and a second switching field effect transistor, a gate of the first switching field effect transistor and a gate of the second switching field effect transistor are connected in parallel and then connected with the optical coupler, a source of the second switching field effect transistor is grounded, a drain of the second switching field effect transistor is connected with a negative electrode of a corresponding monomer cell, a positive electrode of a corresponding monomer cell of the first switching field effect transistor is connected with an external VCC5V, and a drain of the first switching field effect transistor is connected with an external VCC 5.
6. The device for equalizing the single battery cells in the lithium battery pack according to any one of claims 1 to 5, wherein the lithium battery pack to be tested comprises a plurality of single battery cells, and the single battery cells are connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020990850.1U CN212137327U (en) | 2020-06-02 | 2020-06-02 | Device for balancing single battery cell in lithium battery pack |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020990850.1U CN212137327U (en) | 2020-06-02 | 2020-06-02 | Device for balancing single battery cell in lithium battery pack |
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| Publication Number | Publication Date |
|---|---|
| CN212137327U true CN212137327U (en) | 2020-12-11 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202020990850.1U Active CN212137327U (en) | 2020-06-02 | 2020-06-02 | Device for balancing single battery cell in lithium battery pack |
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| Country | Link |
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| CN (1) | CN212137327U (en) |
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2020
- 2020-06-02 CN CN202020990850.1U patent/CN212137327U/en active Active
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Effective date of registration: 20220622 Address after: 410000 room 515a201, block BCD, Lugu business center, No. 199, Lulong Road, Changsha high tech Development Zone, Changsha City, Hunan Province (cluster registration) Patentee after: Changsha runwu Zhilian Enterprise Management Co.,Ltd. Address before: Room 515a209, block BCD, Lugu business center, 199 Lulong Road, Changsha hi tech Development Zone, Hunan 410000 Patentee before: Changsha runwu Zhilian Network Technology Co.,Ltd. |
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Effective date of registration: 20240111 Address after: Hunan Big Data Trading Center, No. 202, Section 2, Wanjiali South Road, Tianxin District, Changsha City, Hunan Province, 410000 yuan Patentee after: Hunan Shenlan Duxing Fast Charging Technology Co.,Ltd. Address before: 410000 room 515a201, block BCD, Lugu business center, No. 199, Lulong Road, Changsha high tech Development Zone, Changsha City, Hunan Province (cluster registration) Patentee before: Changsha runwu Zhilian Enterprise Management Co.,Ltd. |