CN220209995U - Battery charging and discharging circuit - Google Patents
Battery charging and discharging circuit Download PDFInfo
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- CN220209995U CN220209995U CN202321616133.2U CN202321616133U CN220209995U CN 220209995 U CN220209995 U CN 220209995U CN 202321616133 U CN202321616133 U CN 202321616133U CN 220209995 U CN220209995 U CN 220209995U
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- circuit
- battery
- switch module
- mos tube
- charge
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- 238000007599 discharging Methods 0.000 title claims abstract description 27
- 238000001514 detection method Methods 0.000 claims abstract description 39
- 238000005070 sampling Methods 0.000 claims description 18
- 238000000034 method Methods 0.000 abstract description 9
- 238000010586 diagram Methods 0.000 description 2
- WHXSMMKQMYFTQS-UHFFFAOYSA-N Lithium Chemical compound [Li] WHXSMMKQMYFTQS-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000903 blocking effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 229910052744 lithium Inorganic materials 0.000 description 1
Classifications
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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 battery charging and discharging circuit, which comprises: the charging and discharging device comprises a plurality of charging and discharging branches, a control module and a plurality of voltage detection circuits, wherein the charging and discharging branches, the control module and the voltage detection circuits are sequentially connected in series, the voltage detection circuits are in one-to-one correspondence with the single batteries, each first switch module is conducted, each second switch module is disconnected, in the charging or discharging process, current flows through each single battery to charge or discharge each single battery, if the voltage detection circuit detects that the voltage of the single battery of a certain charging and discharging branch reaches full-voltage or under-voltage, the second switch module of the charging and discharging branch is controlled to be conducted, and the current flows through the second switch modules and does not pass through the single battery of the charging and discharging branch any more, so that the overcharge or overdischarge of the single battery is avoided.
Description
Technical Field
The utility model relates to the technical field of battery charging and discharging, in particular to a battery charging and discharging circuit.
Background
The traditional lithium battery charging and discharging method adopts a battery channel of battery related equipment to charge and discharge the single battery, namely one battery occupies one charging and discharging channel, and the large-scale charging and discharging process uses more charging and discharging equipment and occupies a large area. This charge-discharge method may not be completely consistent due to the different battery channel output current accuracy.
In the prior art, the single batteries are connected in series to carry out charge and discharge, so that the occupied area is small, the current is consistent, and however, in the charge and discharge process, partial single batteries are overcharged or overdischarged due to the fact that the electric quantity of each single battery is inconsistent.
Disclosure of Invention
The present utility model aims to solve at least one of the technical problems existing in the prior art. Therefore, the utility model provides a battery charging and discharging circuit which can solve the problems of overcharging and overdischarging of single batteries.
According to an embodiment of the utility model, a battery charge and discharge circuit includes:
each charge-discharge branch comprises a circuit positive end, a circuit negative end, a first switch module, a second switch module and a single battery, wherein the circuit positive end is used for being connected with a power supply, the input end of the first switch module is connected with the circuit positive end, the output end of the first switch module is connected with the positive electrode of the single battery, the negative electrode of the single battery is connected with the circuit negative end, the input end of the second switch module is connected with the circuit positive end, the output end of the second switch module is connected with the circuit negative end, the circuit positive end of one charge-discharge branch is connected with the circuit negative end of the last charge-discharge branch, the circuit positive end of the first charge-discharge branch is connected with the output end of the power supply, and the circuit negative electrode of the last charge-discharge branch is grounded;
the output end of the control module is connected with the control end of the first switch module, and the output end of the control module is also connected with the control end of the second switch module;
the voltage detection circuits are in one-to-one correspondence with the single batteries, the input ends of the voltage detection circuits are connected with the single batteries so as to be used for detecting the voltage of the single batteries, and the output ends of the voltage detection circuits are connected with the input ends of the control modules.
The battery charging and discharging circuit provided by the embodiment of the utility model has at least the following beneficial effects:
and switching on each first switch module, disconnecting each second switch module, and in the charging or discharging process, current flows through each single battery to charge or discharge each single battery, and if the voltage detection circuit detects that the voltage of the single battery of a certain charging and discharging branch reaches full-voltage or under-voltage, controlling the second switch modules of the charging and discharging branch to be switched on, and the current flows through the second switch modules, so that the single battery does not pass through the single battery of the charging and discharging branch any more, and overcharge or overdischarge of the single battery is avoided.
According to some embodiments of the utility model, the first switch module comprises a first MOS tube and a second MOS tube, a drain electrode of the first MOS tube is connected with a drain electrode of the second MOS tube, a source electrode of the second MOS tube is connected with a positive electrode of the single battery, an output end of the control module is connected with a gate electrode of the first MOS tube, and an output end of the control module is connected with a gate electrode of the second MOS tube.
According to some embodiments of the utility model, the first and second MOS transistors are NMOS transistors.
According to some embodiments of the utility model, the second switch module includes a third MOS transistor, a drain electrode of the third MOS transistor is connected to an input end of the first switch module, a source electrode of the third MOS transistor is connected to a negative electrode of the single battery, and the control module is configured to control a gate electrode of the third MOS transistor.
According to some embodiments of the utility model, the charge-discharge branch further comprises an inductor, one end of the inductor is connected to the positive terminal of the circuit, and the other end of the inductor is connected to the input terminal of the first switch module.
According to some embodiments of the present utility model, the battery pack further comprises a current detection circuit corresponding to the single battery, an input end of the current detection circuit is connected with a negative electrode of the single battery, and an output end of the current detection circuit is connected with an input end of the control module.
According to some embodiments of the utility model, the current detection circuit comprises a current sampling resistor, one end of the current sampling resistor is connected with the negative electrode of the single battery, and the other end of the current sampling resistor is connected with the input end of the control module.
According to some embodiments of the present utility model, the battery pack further comprises a temperature detection circuit corresponding to the single battery, wherein an input end of the temperature detection circuit is connected with a negative electrode of the single battery, and an output end of the temperature detection circuit is connected with an input end of the control module.
According to some embodiments of the utility model, the temperature detection circuit comprises a piezoresistor, one end of the piezoresistor is connected with the negative electrode of the single battery, and the other end of the piezoresistor is connected with the input end of the control module.
According to some embodiments of the utility model, the voltage detection circuit comprises a voltage sampling resistor, one end of the voltage sampling resistor is connected with the positive electrode of the single battery, and the other end of the voltage sampling resistor is connected with the input end of the control module.
Additional aspects and advantages of the utility model will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the utility model.
Drawings
The utility model is further described with reference to the accompanying drawings and examples, in which:
FIG. 1 is a circuit diagram of a plurality of charge and discharge branches of the present utility model connected in series;
fig. 2 is a circuit diagram of a charge-discharge branch circuit of the present utility model.
Detailed Description
Embodiments of the present utility model are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar elements or elements having like or similar functions throughout. The embodiments described below by referring to the drawings are illustrative only and are not to be construed as limiting the utility model.
In the description of the present utility model, it should be understood that the direction or positional relationship indicated with respect to the description of the orientation, such as up, down, etc., is based on the direction or positional relationship shown in the drawings, is merely for convenience of describing the present utility model and simplifying the description, and does not indicate or imply that the apparatus or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as limiting the present utility model.
In the description of the present utility model, plural means two or more. The description of the first and second is for the purpose of distinguishing between technical features only and should not be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated or implicitly indicating the precedence of the technical features indicated.
In the description of the present utility model, unless explicitly defined otherwise, terms such as arrangement, installation, connection, etc. should be construed broadly and the specific meaning of the terms in the present utility model can be reasonably determined by a person skilled in the art in combination with the specific contents of the technical scheme.
A battery charge-discharge circuit according to an embodiment of the present utility model is described below with reference to fig. 1 to 2.
As shown in fig. 1, a battery charge and discharge circuit according to an embodiment of the present utility model includes:
the battery pack comprises a plurality of charge and discharge branches, a control module and a plurality of voltage detection circuits, wherein the charge and discharge branches are sequentially connected in series, the voltage detection circuits correspond to the single batteries one by one, each charge and discharge branch comprises a circuit positive end VCC, a circuit negative end GND, a first switch module, a second switch module and the single batteries, the circuit positive end VCC is used for being connected with a power supply, the input end of the first switch module is connected with the circuit positive end VCC, the output end of the first switch module is connected with the positive end of the single batteries, the negative end of the single batteries is connected with the circuit negative end GND, the input end of the second switch module is connected with the circuit positive end VCC of the second switch module, the output end of the second switch module is connected with the circuit negative end GND of the first charge and discharge branch, the output end of the control module is connected with the control end of the first switch module, the input end of the voltage detection circuit is connected with the single batteries for detecting the voltage of the single batteries, and the output end of the voltage detection circuit is connected with the input end of the control module.
And switching on each first switch module, disconnecting each second switch module, and in the charging or discharging process, current flows through each single battery to charge or discharge each single battery, and if the voltage detection circuit detects that the voltage of the single battery of a certain charging and discharging branch reaches full-voltage or under-voltage, controlling the second switch modules of the charging and discharging branch to be switched on, and the current flows through the second switch modules, so that the single battery does not pass through the single battery of the charging and discharging branch any more, and overcharge or overdischarge of the single battery is avoided.
As shown in fig. 2, the voltage detection circuit includes a voltage sampling resistor R1, one end of the voltage sampling resistor R1 is connected to the positive electrode of the single battery, and the other end of the voltage sampling resistor R1 is connected to the input end of the control module.
As shown in fig. 2, the first switch module includes a first MOS transistor Q5 and a second MOS transistor Q6, a drain electrode of the first MOS transistor Q5 is connected to a drain electrode of the second MOS transistor Q6, a source electrode of the second MOS transistor Q6 is connected to an anode of the single battery, an output end of the control module is connected to a gate electrode of the first MOS transistor Q5, and an output end of the control module is connected to a gate electrode of the second MOS transistor Q6. The second switch module comprises a third MOS tube Q7, the drain electrode of the third MOS tube Q7 is connected with the input end of the first MOS tube Q5, the source electrode of the third MOS tube Q7 is connected with the cathode of the single battery, and the control module is connected with the grid electrode of the third MOS tube Q7 so as to be used for controlling the grid electrode of the third MOS tube Q7. The first MOS transistor Q5, the second MOS transistor Q6, and the third MOS transistor Q7 are NMOS transistors. The first MOS transistor Q5, the second MOS transistor Q6, and the third MOS transistor Q7 may also be replaced by an IGBT, a triode, a thyristor, or the like.
The control module switches on or off the first MOS transistor Q5, the second MOS transistor Q6 and the third MOS transistor Q7 by controlling the voltages of the grid electrodes of the first MOS transistor Q5, the second MOS transistor Q6 and the third MOS transistor Q7. In the constant voltage stage in the charge-discharge process, the control module is in a PWM switching state by controlling the first MOS tube Q5 and the third MOS tube Q7, one part of current flows through the single battery, and the other part of current flows through the third MOS tube Q7. The PWM on duty ratio of the first MOS tube Q5 and the third MOS tube Q7 is controlled, and the purpose of constant voltage charge and discharge of the single battery is achieved.
In the charge-discharge process, when current, voltage or temperature are abnormal, the control module can cut off the corresponding charge-discharge branch circuit in time by controlling the second MOS tube Q6 to be cut off, so that the protection effect is achieved.
As shown in fig. 2, the charge-discharge branch further includes an inductor L3, one end of the inductor L3 is connected to the positive terminal VCC of the circuit, and the other end of the inductor L3 is connected to the input end of the first switch module. The inductor L3 plays roles in direct current and alternating current passing and blocking.
As shown in fig. 2, the charge-discharge branch circuit further includes a current detection circuit corresponding to the single battery one by one, the current detection circuit includes a current sampling resistor R5, one end of the current sampling resistor R5 is connected to the negative electrode of the single battery, and the other end of the current sampling resistor R5 is connected to the input end of the control module through a resistor R3.
As shown in fig. 2, the charge-discharge branch circuit further includes a temperature detection circuit corresponding to the single battery one by one, the temperature detection circuit includes a piezoresistor R6, one end of the piezoresistor R6 is connected with the negative electrode of the single battery, the other end of the piezoresistor R6 is connected with the input end of the control module through a resistor R4, and the piezoresistor R6 has a voltage temperature coefficient and can detect the temperature through the piezoresistor R6.
The embodiments of the present utility model have been described in detail with reference to the accompanying drawings, but the present utility model is not limited to the above embodiments, and various changes can be made within the knowledge of one of ordinary skill in the art without departing from the spirit of the present utility model.
Claims (10)
1. The battery charge-discharge circuit is characterized by comprising:
each charge-discharge branch comprises a circuit positive end, a circuit negative end, a first switch module, a second switch module and a single battery, wherein the circuit positive end is used for being connected with a power supply, the input end of the first switch module is connected with the circuit positive end, the output end of the first switch module is connected with the positive electrode of the single battery, the negative electrode of the single battery is connected with the circuit negative end, the input end of the second switch module is connected with the circuit positive end, the output end of the second switch module is connected with the circuit negative end, the circuit positive end of one charge-discharge branch is connected with the circuit negative end of the last charge-discharge branch, the circuit positive end of the first charge-discharge branch is connected with the output end of the power supply, and the circuit negative electrode of the last charge-discharge branch is grounded;
the output end of the control module is connected with the control end of the first switch module, and the output end of the control module is also connected with the control end of the second switch module;
the voltage detection circuits are in one-to-one correspondence with the single batteries, the input ends of the voltage detection circuits are connected with the single batteries so as to be used for detecting the voltage of the single batteries, and the output ends of the voltage detection circuits are connected with the input ends of the control modules.
2. The battery charge and discharge circuit of claim 1, wherein: the first switch module comprises a first MOS tube and a second MOS tube, the drain electrode of the first MOS tube is connected with the drain electrode of the second MOS tube, the source electrode of the second MOS tube is connected with the positive electrode of the single battery, the output end of the control module is connected with the grid electrode of the first MOS tube, and the output end of the control module is connected with the grid electrode of the second MOS tube.
3. The battery charge and discharge circuit of claim 2, wherein: the first MOS tube and the second MOS tube are NMOS tubes.
4. The battery charge and discharge circuit of claim 1, wherein: the second switch module comprises a third MOS tube, the drain electrode of the third MOS tube is connected with the input end of the first switch module, the source electrode of the third MOS tube is connected with the negative electrode of the single battery, and the control module is used for controlling the grid electrode of the third MOS tube.
5. The battery charge and discharge circuit of claim 1, wherein: the charging and discharging branch circuit further comprises an inductor, one end of the inductor is connected with the positive end of the circuit, and the other end of the inductor is connected with the input end of the first switch module.
6. The battery charge and discharge circuit of claim 1, wherein: the battery pack further comprises current detection circuits which are in one-to-one correspondence with the single batteries, wherein the input ends of the current detection circuits are connected with the cathodes of the single batteries, and the output ends of the current detection circuits are connected with the input ends of the control modules.
7. The battery charge and discharge circuit of claim 6, wherein: the current detection circuit comprises a current sampling resistor, one end of the current sampling resistor is connected with the negative electrode of the single battery, and the other end of the current sampling resistor is connected with the input end of the control module.
8. The battery charge and discharge circuit of claim 1, wherein: the battery pack also comprises temperature detection circuits which are in one-to-one correspondence with the single batteries, wherein the input ends of the temperature detection circuits are connected with the cathodes of the single batteries, and the output ends of the temperature detection circuits are connected with the input ends of the control modules.
9. The battery charge and discharge circuit of claim 8, wherein: the temperature detection circuit comprises a piezoresistor, one end of the piezoresistor is connected with the negative electrode of the single battery, and the other end of the piezoresistor is connected with the input end of the control module.
10. The battery charge and discharge circuit of claim 1, wherein: the voltage detection circuit comprises a voltage sampling resistor, one end of the voltage sampling resistor is connected with the positive electrode of the single battery, and the other end of the voltage sampling resistor is connected with the input end of the control module.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321616133.2U CN220209995U (en) | 2023-06-25 | 2023-06-25 | Battery charging and discharging circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202321616133.2U CN220209995U (en) | 2023-06-25 | 2023-06-25 | Battery charging and discharging circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN220209995U true CN220209995U (en) | 2023-12-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202321616133.2U Active CN220209995U (en) | 2023-06-25 | 2023-06-25 | Battery charging and discharging circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN220209995U (en) |
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2023
- 2023-06-25 CN CN202321616133.2U patent/CN220209995U/en active Active
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