CN220209991U - Active equalization device - Google Patents
Active equalization device Download PDFInfo
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- CN220209991U CN220209991U CN202321503934.8U CN202321503934U CN220209991U CN 220209991 U CN220209991 U CN 220209991U CN 202321503934 U CN202321503934 U CN 202321503934U CN 220209991 U CN220209991 U CN 220209991U
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- square wave
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- control switch
- voltage
- energy storage
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- 238000004146 energy storage Methods 0.000 claims abstract description 63
- 210000000352 storage cell Anatomy 0.000 claims abstract description 45
- 210000004027 cell Anatomy 0.000 claims abstract description 35
- 238000004134 energy conservation Methods 0.000 abstract 1
- 238000010586 diagram Methods 0.000 description 3
- 101100134058 Caenorhabditis elegans nth-1 gene Proteins 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- HBBGRARXTFLTSG-UHFFFAOYSA-N Lithium ion Chemical compound [Li+] HBBGRARXTFLTSG-UHFFFAOYSA-N 0.000 description 1
- 230000002457 bidirectional effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
- 229910001416 lithium ion Inorganic materials 0.000 description 1
- 238000000034 method Methods 0.000 description 1
Abstract
The utility model discloses an active equalization device which comprises an electric quantity transfer circuit, a voltage control switch circuit, a square wave generating circuit and a driving circuit, wherein the electric quantity transfer circuit comprises N energy storage cells, N-1 transfer cells, and a first control switch and a second control switch which are connected between the energy storage cells and the transfer cells. The square wave generating circuit outputs square wave signals to the driving circuit, the driving circuit controls the first control switch and the second control switch to be switched on according to the square wave signals so as to balance electric quantity among the energy storage cells, the input end of the voltage control switch circuit is connected with the output voltage B1 of the 1 st energy storage cell, the output end of the voltage control switch circuit is connected with the square wave generating circuit and the driving circuit, and the voltage of the output voltage B1 is compared with a set value so as to output corresponding high-low level to the square wave generating circuit and the driving circuit, so that the square wave generating circuit and the driving circuit stop working when the voltage of the output voltage B1 is lower than the set value. The utility model has simple structure, low cost and energy conservation.
Description
Technical Field
The utility model relates to the technical field of active equalization, in particular to an active equalization device composed of hardware.
Background
The lithium ion single battery has low voltage, a plurality of single batteries are required to be connected in series to obtain high voltage, and the single batteries have very different characteristics in the production, manufacture and use processes. After a period of use, the battery state inevitably causes unbalance, so that parameters such as the capacity, the internal resistance, the terminal voltage and the like of the battery are unequal, and the service life of the battery pack follows the wooden barrel principle, namely the capacity of the smallest single battery is equal to the capacity of the whole battery pack; eventually leading to a smaller actual capacity of the entire battery pack, a short life and an increased cost. After a large number of charge and discharge cycles, battery equalization control must be employed in order to maintain good battery system consistency.
However, in the existing active equalization technology, the single voltage of each battery string is acquired through an analog front end chip (AFE) or other circuit modules, then the single chip microcomputer is used for judging equalization conditions and controlling a gating equalization switch channel and a control switch power supply to perform active equalization, see patent CN202111681099, and the bidirectional active equalization circuit of the lithium battery based on a flyback circuit can realize active equalization.
Therefore, an active equalization circuit that can solve the above problems is urgently needed.
Disclosure of Invention
The utility model aims to provide an active equalization device which is simple in structure and low in cost, and can stop electric quantity transfer work when the voltage of a first series of energy storage battery cells is too low, so that an equalization circuit enters a low-power-consumption sleep mode, and energy is further saved.
In order to achieve the above objective, the present utility model discloses an active equalization device, which comprises an electric quantity transfer circuit, a voltage control switch circuit, a square wave generating circuit and a driving circuit, wherein the electric quantity transfer circuit comprises N energy storage cells connected in series, N-1 transit cells connected in series, and a switch circuit connected between the energy storage cells and the transit cells, the switch circuit comprises N first control switches and N second control switches, the output end of the square wave generating circuit is connected with the control end of the driving circuit and outputs square wave signals to the driving circuit, the output end of the driving circuit is connected with the first control switches and the second control switches and is used for controlling the first control switches and the second control switches to be switched on according to the square wave signals, so that the ith transit cell is respectively connected with the ith energy storage cell and the (i+1) th energy storage cell in parallel for equalization, the input end of the voltage control switch circuit is connected with the output voltage (B1) of the 1 st energy storage cell, the output end of the voltage control switch circuit is connected with the output voltage (B1) of the lowest, the output end of the square wave generating circuit is connected with the square wave generating circuit, when the output end of the driving circuit is connected with the square wave signal to the square wave generating voltage (1) and the square wave generating voltage (382) is lower than the set value, and the square wave generating voltage (1) is equal to the set value when the square wave generating voltage (1) is lower than the square wave) and the square wave generating voltage (1) is set to be equal to the set value).
Compared with the prior art, the utility model uses the controllable two groups of control switches to switch the parallel energy storage battery core and the transfer battery core, thereby balancing the adjacent energy storage battery cores through the transfer battery core, controlling the balance of the whole energy storage battery core, having simple balancing circuit, and only needing to switch and conduct the two groups of control switches through the high and low level converted by square wave signals, having simple whole circuit and low cost. On the other hand, the utility model can close the square wave generating circuit and the driving circuit to stop the electric quantity transferring work when the voltage of the first string of energy storage battery cells is too low, so that the equalizing circuit enters a low-power consumption sleep mode, and the energy is further saved.
Preferably, the output end of the voltage control switch circuit is connected with the enabling ends of the square wave generating circuit and the driving circuit.
Preferably, the voltage control switch circuit comprises a voltage control switch chip, a first resistor and a second resistor, wherein the input end of the voltage control switch chip is connected with the output voltage B1 through the first resistor, and the output end of the voltage control switch circuit is connected with the square wave generating circuit and the driving circuit through the second resistor.
Specifically, the voltage control switch chip is of the model SSP61CC3002MR.
Preferably, two ends of the ith first control switch are respectively connected between the negative electrode of the ith energy storage battery core and the negative electrode of the ith transfer battery core, two ends of the ith second control switch are respectively connected between the positive electrode of the ith energy storage battery core and the negative electrode of the ith transfer battery core, two ends of the nth first control switch are respectively connected between the negative electrode of the nth energy storage battery core and the positive electrode of the nth-1 transfer battery core, and two ends of the nth second control switch are respectively connected between the positive electrode of the nth energy storage battery core and the positive electrode of the nth-1 transfer battery core.
Preferably, the first control switch and the second control switch are both MOS transistors.
Specifically, the model of the first control switch and the second control switch is HSM3214.
Preferably, the output voltage Bn of the nth energy storage cell is connected to the voltage end of the driving circuit to supply power to the driving circuit.
Drawings
Fig. 1 is a block diagram of an active equalization device of the present utility model.
Fig. 2 is a block diagram of a power transfer circuit in an active equalization apparatus according to the present utility model.
Fig. 3 is a circuit diagram of a voltage controlled switching circuit of the present utility model.
Detailed Description
In order to describe the technical content, the constructional features, the achieved objects and effects of the present utility model in detail, the following description is made in connection with the embodiments and the accompanying drawings.
Referring to fig. 1, the utility model discloses an active equalization apparatus 100, which comprises an electric quantity transfer circuit 10, a voltage control switch circuit 20, a square wave generating circuit 30 and a driving circuit 40.
Referring to fig. 2, the power transfer circuit 10 includes N energy storage cells C11-C14 connected in series, N-1 transit cells C21-C23 connected in series, and a switching circuit connected between the energy storage cells C11-C14 and the transit cells C21-C23, the switching circuit including N first control switches Q11-Q14 and N second control switches Q21-Q24. The positive electrode of the energy storage battery cell C11 outputs an output voltage B1, the negative electrode outputs an output voltage B2, the positive electrode of the energy storage battery cell C12 outputs an output voltage B2, the positive electrode of the energy storage battery cell C13 outputs an output voltage B3, the positive electrode of the energy storage battery cell C14 outputs an output voltage B4, and the output voltages B0-B4 are connected to the BMS system to safely protect a battery pack formed by the energy storage battery cells C11-C14. In this embodiment, N is equal to 4, but the number of N is not limited to 4, and other numbers greater than or equal to 2 may be used.
Specifically, two ends of the 1 st first control switch Q11 are respectively connected between the negative electrode of the 1 st energy storage cell C11 and the negative electrode of the 1 st intermediate cell C21, and two ends of the 1 st second control switch Q21 are respectively connected between the positive electrode of the 1 st energy storage cell C11 and the negative electrode of the 1 st intermediate cell C21. The two ends of the 2 nd first control switch Q12 are respectively connected between the negative electrode of the 2 nd energy storage cell C12 and the negative electrode of the 2 nd intermediate cell C22, and the two ends of the 2 nd second control switch Q22 are respectively connected between the positive electrode of the 2 nd energy storage cell C12 and the negative electrode of the 2 nd intermediate cell C22. The two ends of the 3 rd first control switch Q13 are respectively connected between the negative electrode of the 3 rd energy storage cell C13 and the negative electrode of the 3 rd intermediate cell C23, and the two ends of the 3 rd second control switch Q23 are respectively connected between the positive electrode of the 3 rd energy storage cell C13 and the negative electrode of the 3 rd intermediate cell C23. The two ends of the 4 th first control switch Q14 are respectively connected between the negative electrode of the 4 th energy storage cell C14 and the positive electrode of the 3 rd intermediate cell C23, and the two ends of the 4 th second control switch Q24 are respectively connected between the positive electrode of the 4 th energy storage cell C14 and the positive electrode of the 3 rd intermediate cell C23.
Referring to fig. 1 and 2, the output end of the square wave generating circuit 30 is connected to the control end of the driving circuit 40 and outputs a square wave signal to the driving circuit 40, and the output end of the driving circuit 40 is connected to the first control switches Q11-Q14 and the second control switches Q21-Q24 and is used for controlling to output a driving signal L01 and a driving signal H01 which are high-low level switching and opposite to each other according to the square wave signal, so that the first control switches Q11-Q14 and the second control switches Q21-Q24 are switched on. The ith intermediate conversion cell C21-C23 is then respectively switched and connected with the ith energy storage cell C11-C14 and the (i+1) th energy storage cell C11-C14 in parallel to perform electric quantity equalization. i=1, 2,3 … n-1. Wherein, the first control switches Q11-Q14 and the second control switches Q21-Q24 are MOS tubes. Specifically, the types of the first control switch and the second control switch are HSM3214, and of course, MOS transistors of other types may also be selected. Of course, the types of the first control switch and the second control switch are not limited to MOS transistors, but may be other switches that can be controlled by opening and closing. The driving circuit 40 is a MOS driving circuit.
When the driving signal L01 output by the driving circuit 40 is at a high level and the driving signal H01 is at a low level, the first control switches Q11-Q14 are turned on, the second control switches Q21-Q24 are turned off, the energy storage cell C11 and the relay cell C21 are connected in parallel, the energy storage cell C12 and the relay cell C22 are connected in parallel, and the energy storage cell C13 and the relay cell C23 are connected in parallel. When the driving signal L01 output by the driving circuit 40 is at a low level and the driving signal H01 is at a high level, the first control switches Q11-Q14 are turned off, the second control switches Q21-Q24 are turned on, the energy storage cell C13 and the transfer cell C21 are connected in parallel, the energy storage cell C14 and the transfer cell C22 are connected in parallel, and the energy storage cell C15 and the transfer cell C23 are connected in parallel, so that the transfer cell C21 is continuously connected in parallel with the energy storage cell C11 and the energy storage cell C12 in a switching manner, the transfer cell C22 is continuously connected in parallel with the energy storage cell C12 and the energy storage cell C13 in a switching manner, and the transfer cell C23 is continuously connected in parallel with the energy storage cell C13 and the energy storage cell C14 in a switching manner.
Referring to fig. 1, the input end of the voltage control switch circuit 20 is connected to the output voltage B1 of the 1 st energy storage cell C11 with the lowest output voltage, and the output end is connected to the square wave generating circuit 30 and the driving circuit 40, and is used for comparing the voltage of the output voltage B1 with a set value to output a corresponding high-low level control signal S1 to the square wave generating circuit 30 and the driving circuit 40, wherein when the output voltage B1 is lower than the set value, the voltage control switch circuit 20 outputs a low level control signal S1 to the control end of the square wave generating circuit 30 and the enabling end of the driving circuit 40, so that the square wave generating circuit 30 and the driving circuit 40 stop working when the voltage of the output voltage B1 is lower than the set value. When the output voltage B1 exceeds a set value, the voltage control switch circuit 20 outputs a high-level control signal S1 to the enabling ends of the square wave generating circuit 30 and the driving circuit 40, so that the square wave generating circuit 30 and the driving circuit 40 work normally when the voltage of the output voltage B1 exceeds the set value, and the energy storage cells in the battery pack are controlled to perform electric quantity equalization. Of course, the control signal S1 output by the voltage control switch circuit 20 may be output to other positions of the square wave generating circuit 30 and the driving circuit 40, for example, directly output to the control terminals of the power supply circuits of the square wave generating circuit 30 and the driving circuit 40, so as to control the on/off of the power supply circuits.
Referring to fig. 3, the voltage control switch circuit 20 includes a voltage control switch chip U1, a first resistor R1, and a second resistor R2, wherein an input end of the voltage control switch chip is connected to the output voltage B1 through the first resistor R1, and an output end of the voltage control switch circuit 20 is connected to the square wave generating circuit 30 and the driving circuit 40 through the second resistor R2. Specifically, the voltage control switch chip U1 is SSP61CC3002MR.
Referring to fig. 1, the output voltage B4 of the last, 4 th energy storage cell C14 is connected to the voltage terminal of the driving circuit 40 to supply power to the driving circuit 40. The output voltage B4 of the last energy storage cell C14 is the output voltage of the battery pack formed by the whole energy storage cells.
The foregoing description of the preferred embodiments of the present utility model is not intended to limit the scope of the claims, which follow, as defined in the claims.
Claims (8)
1. An active equalization device, characterized in that: the power transfer circuit comprises N energy storage cells connected in series, N-1 transfer cells connected in series, and a switch circuit connected between the energy storage cells and the transfer cells, wherein the switch circuit comprises N first control switches and N second control switches, the output end of the square wave generation circuit is connected with the control end of the drive circuit and outputs square wave signals to the drive circuit, the output end of the drive circuit is connected with the first control switches and the second control switches and is used for controlling the first control switches and the second control switches to be switched on according to the square wave signals, so that the ith transfer cell is connected with the ith energy storage cell and the (i+1) th energy storage cell in a switching parallel mode for balancing, the input end of the voltage control switch circuit is connected with the output voltage B1 of the 1 st energy storage cell with the lowest output voltage, the output end of the square wave generation circuit is connected with the drive circuit, the output end of the square wave generation circuit is connected with the square wave generation circuit, the output ends of the square wave generation circuit with the square wave signals are connected with the square wave generation circuit, and the square wave generation circuit is enabled to be corresponding to the square wave voltage B1 when the square wave voltage is lower than the drive circuit is equal to the set value, and the square wave voltage is equal to the set value when the square wave voltage is higher than the set value and the square wave voltage is lower than the set value is generated by the drive circuit.
2. The active equalization device of claim 1, wherein: and the output end of the voltage control switch circuit is connected with the enabling ends of the square wave generating circuit and the driving circuit.
3. The active equalization device of claim 1, wherein: the voltage control switch circuit comprises a voltage control switch chip, a first resistor and a second resistor, wherein the input end of the voltage control switch chip is connected with the output voltage B1 through the first resistor, and the output end of the voltage control switch circuit is connected with the square wave generating circuit and the driving circuit through the second resistor.
4. The active equalization device of claim 3, wherein: the voltage control switch chip is of the model SSP61CC3002MR.
5. The active equalization device of claim 1, wherein: the two ends of the ith first control switch are respectively connected between the negative electrode of the ith energy storage battery core and the negative electrode of the ith transfer battery core, the two ends of the ith second control switch are respectively connected between the positive electrode of the ith energy storage battery core and the negative electrode of the ith transfer battery core, the two ends of the nth first control switch are respectively connected between the negative electrode of the nth energy storage battery core and the positive electrode of the n-1 th transfer battery core, and the two ends of the nth second control switch are respectively connected between the positive electrode of the nth energy storage battery core and the positive electrode of the n-1 th transfer battery core.
6. The active equalization device of claim 1, wherein: the first control switch and the second control switch are MOS tubes.
7. The active equalization apparatus of claim 6, wherein: the model of the first control switch and the second control switch is HSM3214.
8. The active equalization device of claim 1, wherein: the output voltage Bn of the nth energy storage cell is connected with the voltage end of the driving circuit to supply power to the driving circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321503934.8U CN220209991U (en) | 2023-06-13 | 2023-06-13 | Active equalization device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321503934.8U CN220209991U (en) | 2023-06-13 | 2023-06-13 | Active equalization device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220209991U true CN220209991U (en) | 2023-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321503934.8U Active CN220209991U (en) | 2023-06-13 | 2023-06-13 | Active equalization device |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220209991U (en) |
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2023
- 2023-06-13 CN CN202321503934.8U patent/CN220209991U/en active Active
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