Novel storage battery monomer voltage sampling and equalization time-sharing control circuit

Abstract

The invention discloses a novel storage battery monomer voltage sampling and equalization time-sharing control circuit, which comprises a monomer sampling and equalization circuit, a time-sharing signal generation circuit and a time-sharing control circuit, the positive electrode of the single storage battery pack B1 is connected with the positive input end of the operational amplifier U1, the negative electrode of the single storage battery pack B1 is connected with the negative input end of the operational amplifier U1, the operational amplifier U1 outputs amplified signals to the multiplexer switch U2, and the microprocessor U4 outputs analog channel selection signals to the multiplexer switch U2 and the decoder U3; the decoder U3 judges whether to output a first time-sharing control signal to the time-sharing control circuit or not according to the requirement of voltage sampling so as to achieve the voltage sampling function of the storage battery pack single body B1, and the microprocessor U4 judges whether to output a second time-sharing control signal to the time-sharing control circuit or not according to the requirement of balanced time-sharing control so as to achieve the balanced time-sharing control function. According to the invention, the time-sharing control function of voltage sampling and equalization of the single storage battery is realized.

Description

Technical Field

[0001] The present invention relates to a battery cell voltage sampling and balancing time-sharing control technology used on satellites. The cell voltage sampling and balancing control can be realized on a single wire of the battery cell input by a time-sharing control method, and multiple cells can be controlled simultaneously. Background Art

[0002] The lithium-ion battery packs used on satellites generally use a multi-cell series connection to achieve the required bus voltage. However, due to the differences in the characteristics of the single cells that make up the lithium-ion battery packs and the different power consumption of the single cell sampling circuits, there will be a voltage difference between the cells, which will gradually expand. After multiple charge and discharge cycles in orbit, the battery cells may be overcharged, thus affecting the safety of the satellite.

[0003] To avoid the above situation, the current common practice is to lead out a sampling line and a balancing line from the positive end of the battery cell. At the same time, the balancing positive line of the positive end of the battery cell of the next level is used as the balancing return line of the negative end of the battery cell of the previous level. This design method has certain limitations. During the balancing control process, the collected battery cell voltage has a certain deviation from the actual value. In addition, the more series connections, the more wires are used, the more connector contacts are required, and the wire harness needs to have a special heat dissipation design, which will increase the cost.

[0004] Therefore, it is necessary to design a circuit to realize the time-sharing control of battery pack single-cell sampling and balancing, and to realize the balancing control of multiple batteries at the same time. Summary of the invention

[0005] In view of the shortcomings of the prior art, the present invention provides a novel battery cell voltage sampling and balancing time-sharing control circuit. The present invention is simple and reliable, realizes stable sampling of battery cell voltage, realizes time-sharing control of sampling and balancing, has high integration, saves cable and connector resources, and can expand functions according to different needs.

[0006] To achieve the above object, the present invention provides the following technical solutions:

[0007] A novel battery cell voltage sampling and balancing time-sharing control circuit comprises a cell sampling and balancing circuit, a time-sharing signal generating circuit and a time-sharing control circuit; the cell sampling and balancing circuit comprises an operational amplifier U1; the time-sharing signal generating circuit comprises a multi-way selection switch U2, a decoder U3 and a microprocessor U4; the positive electrode of the battery cell B1 is connected to the positive input terminal of the operational amplifier U1, and the negative electrode of the battery cell B1 is connected to the negative input terminal of the operational amplifier U1, the operational amplifier U1 outputs the amplified signal to the multi-way selection switch U2, and the microprocessor U4 outputs analog channel selection signals to the multi-way selection switch U2 and the decoder U3 respectively; the decoder U3 determines whether to output the first time-sharing control signal to the time-sharing control circuit according to the need of voltage sampling, thereby realizing the voltage sampling function of the battery cell B1, and the microprocessor U4 determines whether to output the second time-sharing control signal to the time-sharing control circuit according to the need of balanced time-sharing control, thereby realizing the balanced time-sharing control function.

[0008] As a further solution of the present invention, the monomer sampling and balancing circuit also includes a balancing power switch tube V1, and the time-sharing control circuit includes an RS trigger U5, an NPN transistor V2, a PNP transistor V3 and an NPN transistor V4; when the balancing condition is not met, the microprocessor U4 does not output the second time-sharing control signal, the PNP transistor V3 is in the on state, the E and S pins of the RS trigger U5 are at a low level, the output end Q is in a high-impedance state, the NPN transistor V2 is in a disconnected state, and the balancing power switch tube V1 is in a disconnected state.

[0009] As a further solution of the present invention, when the balancing condition is met, the microprocessor U4 outputs a second time-sharing control signal, the PNP transistor V3 is in the off state, if the voltage of the battery pack monomer B1 is not sampled at this time, the NPN transistor V4 remains in the off state, the E and S pins of the RS trigger U5 are both high level, the output terminal Q is high level, the NPN transistor V2 is in the on state, and the balancing power switch tube V1 is in the on state, thereby starting the balancing control function.

[0010] As a further solution of the present invention, if the voltage of the battery pack single cell B1 is to be sampled at this time, the microprocessor U4 outputs an analog channel selection signal, the decoder U3 outputs the first time-sharing control signal to the outside, which is a high level, the NPN transistor V4 changes from the off state to the on state, the E and S pins of the RS trigger U5 both change from a high level to a low level, the output terminal Q changes from a high level to a high impedance state, and the NPN transistor V2 changes from the on state to the off state, thereby controlling the balancing power switch tube V1 to the off state, thereby completing the stable sampling function of the battery single cell voltage.

[0011] As a further solution of the present invention, after the voltage sampling of the battery pack single cell B1 is completed, the first time-sharing control signal output by the decoder U3 disappears, the NPN transistor V4 changes from on to off, the E and S pins of the RS trigger U5 change from low level to high level, the output pin Q changes from high resistance to high level, the NPN transistor V2 changes from off to on, and the balancing power switch tube V1 is turned on again to continue balancing.

[0012] As a further solution of the present invention, the positive electrode of the battery pack monomer B1 is input to the positive input terminal of the operational amplifier U1 after voltage division by R3 and R5, and the negative electrode of the battery pack monomer B1 is input to the negative input terminal of the operational amplifier U1 after voltage division by R6 and R4.

[0013] As a further solution of the present invention, the analog channel selection signals output by the microprocessor U4 are TMCH0, TMCH1, TMCH2 and TMCH3.

[0014] As a further solution of the present invention, the first time-sharing control signal output by the decoder U3 is a balanced shielding signal, and the second time-sharing control signal output by the microprocessor U4 is a balanced signal.

[0015] The present invention has the following beneficial effects:

[0016] The present invention realizes the time-sharing control function of battery cell voltage sampling and balancing by using the signal output by the microprocessor as the selection signal of the multi-way selection switch and the input signal of the decoder, thereby generating a time-sharing signal; and can support the balancing control of multiple battery cells at the same time without affecting the voltage sampling signal.

[0017] In order to more clearly illustrate the structural features and effects of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 The schematic diagram of the battery pack single cell voltage sampling and balancing time-sharing control circuit of the present invention is shown.

[0019] Figure 2 This is a single-cell sampling and balancing circuit diagram of the present invention.

[0020] Figure 3 This is a circuit diagram for generating a time-sharing signal according to the present invention.

[0021] Figure 4 It is a time-sharing control circuit diagram of the present invention. DETAILED DESCRIPTION

[0022] The present invention will be further explained below in conjunction with the accompanying drawings and related knowledge, and described clearly and completely. Obviously, the described application is only a part of the embodiments of the present invention, rather than all the embodiments.

[0023] Reference Figure 1-Figure 4 As shown, the novel battery cell voltage sampling and balancing time-sharing control circuit provided by the present invention solves the problem that the design method in the prior art has certain limitations. In the process of balancing control, the collected battery cell voltage has a certain deviation from the actual value. In addition, the more series connections, the more wires are used, the more connector contacts are required, and the wire harness needs to be specially designed for heat dissipation, which will increase the cost and weight.

[0024] The specific technical solution includes a single-body sampling and balancing circuit, a time-sharing signal generating circuit and a time-sharing control circuit; the single-body sampling and balancing circuit includes an operational amplifier U1;

[0025] The time-sharing signal generating circuit includes a multi-way selection switch U2, a decoder U3 and a microprocessor U4; the positive electrode of the battery pack single cell B1 is connected to the positive input terminal of the operational amplifier U1, and the negative electrode of the battery pack single cell B1 is connected to the negative input terminal of the operational amplifier U1. The operational amplifier U1 outputs the amplified signal to the multi-way selection switch U2, and the microprocessor U4 outputs the analog channel selection signal to the multi-way selection switch U2 and the decoder U3 respectively; the decoder U3 determines whether to output the first time-sharing control signal to the time-sharing control circuit according to the need of voltage sampling, thereby realizing the voltage sampling function of the battery pack single cell B1, and the microprocessor U4 determines whether to output the second time-sharing control signal to the time-sharing control circuit according to the need of balanced time-sharing control, thereby realizing the balanced time-sharing control function. Figure 1 As shown, the present invention realizes the time-sharing control function of battery cell voltage sampling and balancing through the design of single cell sampling and balancing circuit, time-sharing signal generating circuit and time-sharing control circuit, and the signal output by the microprocessor is used as the selection signal of the multi-way selection switch and the input signal of the decoder to generate the time-sharing signal.

[0026] In the present invention, reference is made to Figure 1 As shown, B1 is a schematic diagram of a battery pack, V1 is a balanced power switch tube, R1 is a balanced power resistor, and R2 is a gate current limiting resistor of the power switch tube. The positive electrode of B1 is input to the positive input terminal of the operational amplifier U1 after voltage division by R3 and R5, and the negative electrode of B1 is input to the negative input terminal of the operational amplifier U1 after voltage division by R6 and R4. After amplification, the operational amplifier outputs to the multi-way selection switch U2 of the time-sharing signal generating circuit, wherein the multi-way selection switch U2 is a 16-1 multi-way selection switch, which is specifically connected to the 9th pin of the multi-way selection switch U2.

[0027] Reference Figure 2 As shown, the microprocessor U4 outputs analog channel selection signals, including TMCH0, TMCH1, TMCH2 and TMCH3, to select the channel to be collected, and the signal is output from the first pin of the multi-way selection switch U2. At the same time, the analog channel selection signal output by the microprocessor U4 is also the input signal of the decoder U3, wherein the decoder U3 is a 4-16 decoder, and the decoder U3 outputs the first time-sharing control signal, which is a balanced shielding signal. At the same time, the microprocessor U4 outputs the second time-sharing control signal, which is a balanced signal.

[0028] Reference Figure 2-Figure 4 As shown, the single-cell sampling and balancing circuit also includes a balancing power switch tube V1, and the time-sharing control circuit includes an RS trigger U5, an NPN transistor V2, a PNP transistor V3 and an NPN transistor V4; when the balancing condition is not met, the microprocessor U4 does not output the second time-sharing control signal, the PNP transistor V3 is in the on state, the E and S pins of the RS trigger U5 are both at a low level, the output terminal Q of the RS trigger U5 is in a high-impedance state, the NPN transistor V2 is in a disconnected state, and the balancing power switch tube V1 is in a disconnected state.

[0029] Further, refer to Figure 4 As shown, when the balancing condition is met, the microprocessor U4 outputs the second time-sharing control signal, so that the PNP transistor V3 is in the off state. If the voltage of the battery cell is not sampled at this time, the NPN transistor V4 remains in the off state, the E and S pins of the RS trigger U5 are both high level, and the output terminal Q of the RS trigger U5 is high level, so that the NPN transistor V2 is in the on state, and further controls the balancing power switch tube V1 to be in the on state, thereby starting the balancing control function.

[0030] If the battery cell voltage needs to be sampled at this time, the microprocessor U4 outputs an analog channel selection signal, and the decoder U3 outputs the first time-sharing control signal to the outside, which is a high level. The NPN transistor V4 changes from the off state to the on state, and the E and S pins of the RS trigger U5 change from a high level to a low level. The output terminal Q of the RS trigger U5 changes from a high level to a high impedance state, so that the NPN transistor V2 changes from the on state to the off state, and further controls the balancing power switch tube V1 to the off state, thereby completing the stable sampling function of the battery cell voltage.

[0031] In the present invention, after the battery cell voltage sampling is completed, the first time-sharing control signal output by the decoder U3 disappears, the NPN transistor V4 changes from on to off, the E and S pins of the RS trigger U5 change from low level to high level, the output pin Q of the RS trigger U5 changes from high resistance to high level, the NPN transistor V2 changes from off to on, and the balancing power switch tube V1 is turned on again to continue balancing; thereby realizing the time-sharing control function of battery cell voltage sampling and balancing.

[0032] Through the above circuit design, the present invention is simple and reliable, realizes stable sampling of battery cell voltage, realizes time-sharing control of sampling and balancing, has high integration, saves cable and connector resources, and can expand functions according to different needs.

[0033] It should be noted in the present invention that the present invention can support the simultaneous balancing control of multiple battery cells without affecting the voltage sampling signal, and the simplification based on this circuit or the design improvement for improving the circuit reliability all fall within the scope of protection.

[0034] The technical principle of the present invention is described above in combination with the specific embodiments, which are only preferred implementations of the present invention. The protection scope of the present invention is not limited to the above embodiments, and all technical solutions under the idea of ​​the present invention belong to the protection scope of the present invention. Those skilled in the art can think of other specific implementations of the present invention without creative work, and these methods will fall within the protection scope of the present invention.

Claims

1. A new type of battery cell voltage sampling and balancing time-sharing control circuit, characterized in that: It includes a single-cell sampling and balancing circuit, a time-sharing signal generating circuit and a time-sharing control circuit; the single-cell sampling and balancing circuit includes an operational amplifier U1; the time-sharing signal generating circuit includes a multi-way selection switch U2, a decoder U3 and a microprocessor U4; the positive electrode of the battery pack single-cell B1 is connected to the positive input terminal of the operational amplifier U1, and the negative electrode of the battery pack single-cell B1 is connected to the negative input terminal of the operational amplifier U1, the operational amplifier U1 outputs the amplified signal to the multi-way selection switch U2, and the microprocessor U4 outputs analog channel selection signals to the multi-way selection switch U2 and the decoder U3 respectively; the decoder U3 determines whether to output the first time-sharing control signal to the time-sharing control circuit according to the need of voltage sampling, thereby realizing the voltage sampling function of the battery pack single-cell B1, and the microprocessor U4 determines whether to output the second time-sharing control signal to the time-sharing control circuit according to the need of balanced time-sharing control, thereby realizing the balanced time-sharing control function.

2. The novel battery cell voltage sampling and balancing time-sharing control circuit as claimed in claim 1 is characterized in that: The single-cell sampling and balancing circuit also includes a balancing power switch tube V1, and the time-sharing control circuit includes an RS trigger U5, an NPN transistor V2, a PNP transistor V3 and an NPN transistor V4; when the balancing condition is not met, the microprocessor U4 does not output the second time-sharing control signal, the PNP transistor V3 is in the on state, the E and S pins of the RS trigger U5 are at a low level, the output terminal Q is in a high-impedance state, the NPN transistor V2 is in a disconnected state, and the balancing power switch tube V1 is in a disconnected state.

3. The novel battery cell voltage sampling and balancing time-sharing control circuit as claimed in claim 2 is characterized in that: When the balancing condition is met, the microprocessor U4 outputs the second time-sharing control signal, the PNP transistor V3 is in the off state, if the voltage of the battery pack monomer B1 is not sampled at this time, the NPN transistor V4 remains in the off state, the E and S pins of the RS trigger U5 are both high level, the output terminal Q is high level, the NPN transistor V2 is in the on state, and the balancing power switch tube V1 is in the on state, thereby starting the balancing control function.

4. The novel battery cell voltage sampling and balancing time-sharing control circuit as claimed in claim 3 is characterized in that: If the voltage of the battery pack single cell B1 is to be sampled at this time, the microprocessor U4 outputs an analog channel selection signal, and the decoder U3 outputs the first time-sharing control signal to the outside, which is a high level. The NPN transistor V4 changes from the off state to the on state, and the E and S pins of the RS trigger U5 change from a high level to a low level, and the output terminal Q changes from a high level to a high impedance state, and the NPN transistor V2 changes from an on state to an off state, thereby controlling the balancing power switch tube V1 to be in an off state, thereby completing the stable sampling function of the battery single cell voltage.

5. The novel battery cell voltage sampling and balancing time-sharing control circuit as claimed in claim 4 is characterized in that: When the voltage sampling of the battery pack single cell B1 is completed, the first time-sharing control signal output by the decoder U3 disappears, the NPN transistor V4 changes from on to off, the E and S pins of the RS trigger U5 change from low level to high level, the output pin Q changes from high resistance to high level, the NPN transistor V2 changes from off to on, and the balancing power switch tube V1 is turned on again, thereby continuing the balancing control function.

6. The novel battery cell voltage sampling and balancing time-sharing control circuit as claimed in claim 5 is characterized in that: The positive electrode of the battery pack single cell B1 is input to the positive input terminal of the operational amplifier U1 after voltage division by R3 and R5, and the negative electrode of the battery pack single cell B1 is input to the negative input terminal of the operational amplifier U1 after voltage division by R6 and R4.

7. The novel battery cell voltage sampling and balancing time-sharing control circuit as claimed in claim 6 is characterized in that: The analog channel selection signals output by the microprocessor U4 are TMCH0, TMCH1, TMCH2 and TMCH3.

8. The novel battery cell voltage sampling and balancing time-sharing control circuit as claimed in claim 7 is characterized in that: The first time-sharing control signal output by the decoder U3 is a balanced shielding signal, and the second time-sharing control signal output by the microprocessor U4 is a balanced signal.

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