CN211830301U - Series lithium battery charging balance circuit - Google Patents
Series lithium battery charging balance circuit Download PDFInfo
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- CN211830301U CN211830301U CN202020828444.5U CN202020828444U CN211830301U CN 211830301 U CN211830301 U CN 211830301U CN 202020828444 U CN202020828444 U CN 202020828444U CN 211830301 U CN211830301 U CN 211830301U
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/10—Energy storage using batteries
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Abstract
The utility model discloses a series connection lithium cell balanced circuit that charges, include the group battery that forms by the series connection of N electric core, a voltage sampling circuit for gathering each electric core voltage in the group battery, DC-DC power module, DC-DC output control circuit, switch combination circuit, switch drive circuit, MCU the control unit, DC-DC power module, switch combination circuit and group battery connect gradually, voltage sampling circuit is connected with MCU the control unit, DC-DC output control circuit and DC-DC power module connect gradually, MCU the control unit, switch drive circuit and switch combination circuit connect gradually. The utility model discloses not only can monitor the voltage of each section electric core in the group battery effectively, to whole group battery or partial electric core or even single section electric core charge, solve the equalizing charge problem of each electric core in the group battery, avoid because of the individual difference, and need filter each electric core.
Description
Technical Field
The utility model relates to a battery charging technology field especially relates to a series connection lithium cell balanced circuit that charges.
Background
In recent years, more and more lithium ion batteries are used in medical treatment, automobiles, and consumer electronics. For different loads, the lithium batteries are often required to be connected in series and in parallel to meet the output requirements of different voltages and currents. However, the individual differences of the battery cells themselves in the lithium battery pack formed by series-parallel connection and the external influences such as the inconsistency of the working temperature make the battery cells have larger differences, inconsistent capacities and inconsistent capacities after working for a long time, so that some battery cells can be fully charged when charging is easily caused, and some battery cells cannot be fully charged (namely, under-charging), which seriously affects the performance and service life of the lithium battery pack.
Disclosure of Invention
An object of the utility model is to provide a series connection lithium cell balanced circuit that charges.
Realize the utility model discloses purpose technical scheme is: a series lithium battery charging balance circuit comprises a battery pack formed by connecting N battery cells in series, a voltage sampling circuit for collecting the voltages of the battery cells in the battery pack, a DC-DC power supply module, a DC-DC output control circuit, a switch combination circuit, a switch driving circuit, an MCU control unit, a DC-DC power supply module, the switch combination circuit and the battery pack are sequentially connected, the voltage sampling circuit is connected with the MCU control unit, the DC-DC output control circuit and the DC-DC power supply module are sequentially connected, the MCU control unit, the switch driving circuit and the switch combination circuit are sequentially connected, wherein the N battery cells in the battery pack are sequentially connected by Ci(i ═ 1, 2, 3, … …, N) denotes that N is a natural integer not less than 2, and both ends of the battery pack are output ends;
the switch combination circuit comprises 2N +1 switches, and the 2N +1 switches are sequentially connected with the Kj(j ═ 1, 2, 3, … …, 2N +1) denotes any of cells C of the battery packnThree switches (K) connected in series at both ends2n-1、K2n、K2n+1) Parallel connection, wherein N is any natural integer not greater than N;
both ends of the DC-DC power supply module are connected with all the switches K in series2m(m-1, 2, 3, … …, N) in parallel;
the MCU control unit is used for receiving the voltage of each battery cell of the battery pack collected by the voltage sampling circuit; controlling the switch driving circuit to drive the switch combination circuit so as to switch corresponding switches of all switches in the switch combination circuit; and controlling the DC-DC output control circuit to drive the DC-DC power supply module to output corresponding voltage.
The above-mentioned battery cell CiWhen subscripts are the same, the same cell core is formed; switch KjWhen the subscript of (a) is the same, it is an in-line switch.
Further, the DC-DC output control circuit is a PWM circuit. The PWM circuit can be an existing PWM chip, or a built-in and self-contained PWM circuit of the MCU control unit, the output waveform of the PWM circuit is controlled by the MCU control unit to switch the output of the DC-DC power supply module, wherein when the MCU control unit self-contained PWM circuit is adopted, as the MCU control unit is usually HT66F0185 or STM32 series chips, the DC-DC power supply module is directly connected with the MCU control unit in terms of a macroscopic structure. In addition, the DC-DC output control circuit of the present invention can also be a driving circuit for driving the MOS transistor switch in the DC-DC power supply module, such as the driving chips of UCC27321, UCC37323, MD1211, etc.
Further, the switch driving circuit is any one of a PWM circuit or a MOS transistor switch driving circuit. When the MCU control unit is adopted, as the MCU control unit is usually HT66F0185 or STM32 series chips, the switch combination circuit is directly connected with the MCU control unit in terms of a macroscopic structure; the MOS switch driving circuit may be an off-the-shelf switch driving chip, such as UCC27321, UCC37323, MD1211, etc., or may be a MOS switch driving circuit controlled by an input signal of the MCU control unit.
The utility model discloses series connection lithium cell balanced circuit that charges not only can monitor the voltage of each section of electric core in the group battery effectively, charges to whole group battery or partial electric core or even single section electric core, solves the balanced charging problem of each electric core in the group battery, avoids because of individual difference, and each electric core needs to be screened, and it has reduced the loaded down with trivial details manufacturing procedure of all kinds of products greatly, improves the life of product, reduces the safe risk that the product used; when the battery pack discharges, the charging current is directly sent out from the discharging end of the battery pack and does not pass through any switch in the switch combination circuit, so that the circuit loss and the risk caused by the stress born by a circuit switch device can be greatly reduced, the problem of device damage is well avoided, the external output super-high power of the battery pack is not influenced, and the high-current output of the battery pack can be realized.
Drawings
Fig. 1 is a schematic structural diagram of a charging balance circuit of series lithium batteries according to the present invention;
fig. 2 is a circuit diagram of the combined circuit of the series lithium battery charging balance circuit switch and the battery pack of the present invention;
fig. 3 is a circuit diagram of the switch driving circuit driving a single switch in the series lithium battery charging balance circuit of the present invention.
Detailed Description
The preferred embodiments of the charging balance circuit for series lithium batteries of the present invention will be described in detail with reference to the accompanying drawings:
as shown in fig. 1 and fig. 2, a charging balance circuit for series lithium batteries comprises a battery pack 10 formed by connecting N battery cells in series, a voltage sampling circuit 1 for collecting voltages of each battery cell in the battery pack 10, a DC-DC power module 2, a DC-DC output control circuit 3, a switch combination circuit 4, a switch driving circuit 5, and an MCU control unit 6, wherein the DC-DC power module 2, the switch combination circuit 4, and the battery pack 10 are sequentially connected, the voltage sampling circuit 1 is connected with the MCU control unit 6, the DC-DC output control circuit 3, and the DC-DC power module 2 are sequentially connected, the MCU control unit 6, the switch driving circuit 5, and the switch combination circuit 4 are sequentially connected, wherein,
n cells in the battery pack 10 are sequentially connected with Ci(i is 1, 2, 3, … …, N), where N is a natural integer no less than 2, and both ends of the battery pack 10 are provided with discharge ends 101;
the switch combination circuit 4 comprises 2N +1 switches, and the 2N +1 switches are sequentially connected with Kj(j ═ 1, 2, 3, … …, 2N +1) denotes any of the cells C of the battery pack 10nThree switches (K) connected in series at both ends2n-1、K2n、 K2n+1) Parallel connection, wherein N is any natural integer not greater than N;
both ends of the DC-DC power supply module 2 are connected with all the switches K in series2m(m-1, 2, 3, … …, N) in parallel;
the MCU control unit 6 is used for receiving the voltage of each electric core of the battery pack 10 collected by the voltage sampling circuit 1; controlling the switch driving circuit 5 to make the switch driving circuit 5 drive the switch combination circuit 4 so as to switch the corresponding switch of each switch in the switch combination circuit 4; and controlling the DC-DC output control circuit 3 to enable the DC-DC output control circuit 3 to drive the DC-DC power supply module 2 to output corresponding voltage.
The utility model discloses series connection lithium cell balanced circuit that charges through switch combination circuit 4's setting, makes the form of charging of electric core in the group battery 10 can be changed by the adjustment, and it charges together to establish ties like all electric cores, or continuous part electric core together charges, or single electric core charges alone. Taking the battery pack 10 formed by connecting four battery cells in series as an example, the following table lists the charging conditions and the corresponding switch states of the switches of the switch combination circuit 4.
In the above table, √ denotes closed, and xs denotes open.
The utility model discloses series connection lithium cell balanced circuit that charges through the control to switch combination circuit 4, can realize the conversion of the different circumstances of charging. The switch driving circuit 5 for driving the switch combination circuit 4 is controlled by the MCU control unit 6, and the MCU control unit 6 can adjust the state of each switch in the switch combination circuit 4 under the control of the switch driving circuit 5.
The utility model discloses series connection lithium cell balanced circuit that charges, switch drive circuit 5 are any kind among PWM circuit or the MOS pipe switch drive circuit. When the MCU control unit 6 is adopted, the switch combination circuit 4 is directly connected with the MCU control unit 6 in terms of a macro structure, because the MCU control unit 6 is usually a HT66F0185 or STM32 series chip. The MOS switch driving circuit may be an off-the-shelf switch driving chip, such as UCC27321, UCC37323, MD1211, or an MOS switch driving circuit controlled by an input signal of the MCU control unit 6, as shown in fig. 3, which provides an MOS switch driving circuit controlled by an input signal of the MCU control unit 6, in which the input signal of the MCU control unit 6 controls the triode Q1 and the triode Q2, so that the MOS transistor Q3 obtains the capability of driving each switch in the switch combination circuit 4 from VCC, and further controls the switch combination circuit 4.
The utility model discloses series connection lithium cell balanced circuit that charges, under the different charging circumstances, especially when charging electric core quantity changes, often requires DC-DC power module 2's output voltage corresponding adjustment output, if the charging voltage of a section of electric core is 4.2V, charges two sections of electric cores, then requires DC-DC power module 2's output voltage to be 8.4V; when the three battery cells are charged, the output voltage of the DC-DC power supply module 2 is required to be 12.6V; when the four cores are charged, the output voltage of the DC-DC power supply module 2 is required to be 16.8V.
The utility model discloses series connection lithium cell balanced circuit that charges, DC-DC power module 2 are output voltage adjustable DC-DC power module, and MCU the control unit 6 makes DC-DC output control circuit 3 drive DC-DC power module 2 with the corresponding voltage of output through the control to DC-DC output control circuit 3.
The utility model discloses series connection lithium cell balanced circuit that charges, DC-DC output control circuit 3 are any kind among PWM circuit or the MOS pipe switch drive circuit. The PWM circuit may be an existing PWM chip, or a built-in and self-contained PWM circuit of the MCU control unit 6, and the output of the DC-DC power module 2 is switched by controlling the output waveform of the PWM circuit by the MCU control unit 6, when the MCU control unit 6 is adopted, because the MCU control unit 6 is usually a HT66F0185 or STM32 series chip, the DC-DC power module 2 is directly connected to the MCU control unit 6 in terms of a macro structure. In addition, the DC-DC output control circuit 3 of the present invention may also be a driving circuit for driving the MOS transistor switch in the DC-DC power module 2, such as the driving chips of UCC27321, UCC37323, MD1211, etc.
The charging balance circuit of the series lithium battery of the utility model is controlled by the MCU control unit 6, the conversion of different charging forms of the battery cells in the battery pack 10 can be realized, and the flexibility of charging is greatly improved, for example, at the initial charging stage, all the battery cells in the battery pack 10 can be generally connected in series and charged together, after the voltage sampling circuit 1 acquires that the voltage of any one battery cell reaches a preset value in the MCU control unit 6, the MCU control unit 6 can control the switch driving circuit 5 to adjust the switch states of the switches in the switch combination circuit 4, for example, the continuous battery cores with voltage values not reaching the preset value are charged together, or the cells of which the voltage values have not reached the preset value are individually charged one by one, so that the voltages of all the cells in the battery pack 10 can reach the preset value, therefore, the charging of each battery cell in the battery pack 10 is more balanced, and the situation that part of the battery cells cannot be fully charged (under-voltage) due to individual difference of the battery cells is avoided.
The utility model discloses series connection lithium cell balanced circuit that charges not only can monitor the voltage of each section of electric core in group battery 10 effectively, charges to whole group battery 10 or partial electric core or even single section electric core, solves the balanced charging problem of each electric core in group battery 10, avoids because of individual difference, and each electric core needs to be screened, and it has reduced the loaded down with trivial details manufacturing procedure of all kinds of products greatly, improves the life of product, reduces the safe risk that the product used; when the battery pack 10 discharges, the charging current is directly sent out from the discharging end 101 of the battery pack 10 and does not pass through any switch in the switch combination circuit 4, so that the circuit loss and the risk caused by the stress born by a circuit switch device can be greatly reduced, the problem of device damage is well avoided, the external output super-high power of the battery pack is not influenced, and the large-current output of the battery pack can be realized.
The utility model discloses series connection lithium cell balanced circuit that charges, MCU the control unit 6 can adopt series chips such as HT66F0185 or STM32 usually.
The utility model discloses be not limited to the embodiment, to the utility model discloses the ordinary technical personnel in the technical field of do not deviate from the utility model discloses under the prerequisite of design, can also make a plurality of simple deductions or replacement, all should regard as belonging to the utility model discloses a protection scope.
Claims (3)
1. The utility model provides a series connection lithium cell charge balanced circuit which characterized in that: comprises a battery pack formed by connecting N battery cells in series, a voltage sampling circuit for collecting the voltage of each battery cell in the battery pack, a DC-DC power supply module, a DC-DC output control circuit, a switch combination circuit, a switch driving circuit and an MCU control unit, wherein the DC-DC power supply module, the switch combination circuit and the battery pack are sequentially connected, the voltage sampling circuit is connected with the MCU control unit, the DC-DC output control circuit and the DC-DC power supply module are sequentially connected, the MCU control unit, the switch driving circuit and the switch combination circuit are sequentially connected, wherein,
n electric cores in the battery pack are sequentially composed of CiThe battery pack is characterized in that i is 1, 2, 3, … … and N, N is a natural integer not less than 2, and two ends of the battery pack are output ends;
the switch combination circuit comprises 2N +1 switches, and the 2N +1 switches are sequentially connected with the KjRepresents j ═ 1, 2, 3, … …, 2N +1, and any cell C of the battery packnThree switches K connected in series at two ends2n-1、K2n、K2n+1Parallel connection, wherein N is any natural integer not greater than N;
both ends of the DC-DC power supply module are connected with all the switches K in series2mParallel connection, m is 1, 2, 3, … … and N;
the MCU control unit is used for receiving the voltage of each battery cell of the battery pack collected by the voltage sampling circuit; controlling the switch driving circuit to drive the switch combination circuit so as to switch corresponding switches of all switches in the switch combination circuit; and controlling the DC-DC output control circuit to drive the DC-DC power supply module to output corresponding voltage.
2. The series lithium battery charge balancing circuit of claim 1, wherein: the DC-DC output control circuit is a PWM circuit.
3. The series lithium battery charge balancing circuit of claim 1, wherein: the switch driving circuit is any one of a PWM circuit or a MOS tube switch driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020828444.5U CN211830301U (en) | 2020-05-18 | 2020-05-18 | Series lithium battery charging balance circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202020828444.5U CN211830301U (en) | 2020-05-18 | 2020-05-18 | Series lithium battery charging balance circuit |
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| Publication Number | Publication Date |
|---|---|
| CN211830301U true CN211830301U (en) | 2020-10-30 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202020828444.5U Active CN211830301U (en) | 2020-05-18 | 2020-05-18 | Series lithium battery charging balance circuit |
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| CN (1) | CN211830301U (en) |
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2020
- 2020-05-18 CN CN202020828444.5U patent/CN211830301U/en active Active
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