CN217240368U - Parallel battery protection circuit and power supply device - Google Patents
Parallel battery protection circuit and power supply device Download PDFInfo
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- CN217240368U CN217240368U CN202220350647.7U CN202220350647U CN217240368U CN 217240368 U CN217240368 U CN 217240368U CN 202220350647 U CN202220350647 U CN 202220350647U CN 217240368 U CN217240368 U CN 217240368U
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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 parallelly connected battery protection circuit and power supply unit, this circuit includes: the battery pack comprises a parallel battery pack, a detection circuit, a control circuit, a first battery cell, a second battery cell, a first switch circuit and a second switch circuit, wherein the first switch circuit is connected between the first battery cell and a load end, the second switch circuit is connected between the second battery cell and the load end, the detection circuit is respectively connected with the first battery cell, the second battery cell and the control circuit, and the control circuit is respectively connected with the first switch circuit and the second switch circuit; the detection circuit detects voltages of the first battery cell and the second battery cell; when the voltage of the first battery cell is detected to be larger than the voltage of the second battery cell, the first switch circuit is switched on, the second switch circuit is switched off, and when the voltage of the first battery cell is detected to be smaller than or equal to the voltage of the second battery cell, the first switch circuit is switched off, and the second switch circuit is switched on. The utility model provides a because electric core charges mutually and influences battery life's problem in the parallelly connected group battery.
Description
Technical Field
The utility model relates to a protection circuit field, in particular to direct current prevent reverse connection protection circuit and power supply unit.
Background
In portable electronic devices such as electric cars, mobile terminals, cameras and the like, battery power supply is applied to battery power supply, and the battery power supply usually adopts a parallel connection structure.
When the existing battery parallel structure is used, because the internal resistance of each battery cell in the battery is different in actual use, the difference of the discharge capacity is caused, when the discharge capacities of the batteries are unequal, the condition that the batteries are charged mutually can occur by connecting a plurality of battery cells in parallel, the service life of the battery is influenced, and the great potential safety hazard is caused to the use of equipment.
SUMMERY OF THE UTILITY MODEL
The utility model aims at providing a parallelly connected battery protection circuit and power supply unit, aim at solving because the problem that influences battery life because electric core charges mutually in the parallelly connected group battery.
In order to achieve the above object, the present invention provides a parallel battery protection circuit, including: the device comprises a parallel battery pack, a detection circuit, a control circuit, a switch circuit and a load end;
the parallel battery pack comprises a first battery cell and a second battery cell, the switch circuit comprises a first switch circuit and a second switch circuit, the first switch circuit is connected between the first battery cell and the load end, the second switch circuit is connected between the second battery cell and the load end, the detection circuit is respectively connected with the first battery cell, the second battery cell and the control circuit, and the control circuit is respectively connected with the controlled end of the first switch circuit, the controlled end of the second switch circuit and the detection circuit;
the detection circuit is used for detecting the voltages of the first battery cell and the second battery cell;
the control circuit is configured to control the first switch circuit to be turned on and the second switch circuit to be turned off when detecting that the voltage of the first battery cell is greater than the voltage of the second battery cell, and control the first switch circuit to be turned off and the second switch circuit to be turned on when detecting that the voltage of the first battery cell is less than or equal to the voltage of the second battery cell.
Optionally, the detection circuit is further connected to the load end, and when the voltage of the load end is greater than the voltage of the first battery cell and the voltage of the second battery cell, the control circuit controls the first switch circuit and the second switch circuit to be turned off.
Optionally, the parallel battery protection circuit further includes a charging circuit, and the charging circuit is respectively connected to the detection circuit, the first battery cell, and the second battery cell;
the detection circuit is also used for detecting the input voltage of the charging circuit;
the control circuit is used for controlling the first switch circuit and the second switch circuit to be switched off when the input voltage of the charging circuit detected by the detection circuit is larger than a preset voltage value.
Optionally, the control circuit is further connected to a controlled end of the charging circuit, the detection circuit is further configured to detect an abnormal operating state of the first battery cell and the second battery cell, and the control circuit is further configured to control the first switch circuit and the charging circuit to be turned off when the detection circuit detects that the first battery cell is in an abnormal state, and control the second switch circuit and the charging circuit to be turned off when the detection circuit detects that the second battery cell is in an abnormal state.
Optionally, the number of the parallel battery packs is plural, and the number of the switch circuits is plural corresponding to the parallel battery packs.
Optionally, the control circuit and the detection circuit are integrated on the same main control chip, the main control chip includes a first battery cell detection end, a second battery cell detection end, a first battery cell control end, a second battery cell control end and a load end detection end, the first battery cell detection end is connected with the first battery cell, the second battery cell detection end is connected with the second battery cell, the first battery cell control end is connected with the controlled end of the first switch circuit, the second battery cell control end is connected with the controlled end of the second switch circuit, and the load end detection end is connected with the load end.
Optionally, the first switch circuit includes a first MOS transistor and a first capacitor, the first MOS transistor is an N-type MOS transistor, a source of the first MOS transistor is connected to the first electrical core and the first end of the first capacitor, a gate of the first MOS transistor is connected to the first electrical core control end and the second end of the first capacitor, and a drain of the first MOS transistor is connected to the load end.
Optionally, the second switch circuit includes a second MOS transistor and a second capacitor, the second MOS transistor is an N-type MOS transistor, a source of the second MOS transistor is connected to the second electrical core and a first end of the second capacitor, a gate of the second MOS transistor is connected to the second electrical core control end and a second end of the second capacitor, and a drain of the second MOS transistor is connected to the load end.
Optionally, the main control chip further includes a charging circuit detection end, a charging circuit control end and a load detection end, the charging circuit detection end is connected with the charging circuit, the charging circuit control end is connected with the controlled end of the charging circuit, and the load detection end is connected with the load end.
The utility model provides a power supply unit, power supply unit includes as above parallelly connected battery protection circuit.
The utility model discloses a set up parallelly connected group battery, detection circuitry, control circuit, switch circuit and load end, parallelly connected group battery includes first electric core and second electric core, switch circuit includes first switch circuit and second switch circuit, first switch circuit connects between first electric core and load end, second switch circuit connects between second electric core and load end, detection circuitry is connected with first electric core, second electric core and control circuit respectively, control circuit is connected with controlled end of first switch circuit, controlled end and detection circuitry of second switch circuit respectively; the detection circuit is used for detecting the voltage of the first battery cell and the voltage of the second battery cell, the control circuit is used for controlling the first switch circuit to be switched on when the voltage of the first battery cell is detected to be larger than the voltage of the second battery cell, the second switch circuit is switched off, the first battery cell supplies power for the load end, the second battery cell does not supply power for the load end, when the voltage of the first chip is detected to be smaller than or equal to the voltage of the second chip, the first switch circuit is controlled to be switched off, the second switch circuit is switched on, the first battery cell does not supply power for the load end, the second battery cell supplies power for the load end, namely, two battery cells in the parallel battery pack cannot supply power for the load end at the same time, and the control circuit controls the battery cell with a relatively higher voltage value to supply power for the load end. Compared with the parallel battery pack in the background art, the protection circuit solves the problem that the service life of the battery is influenced due to mutual charging of the electric cores in the parallel battery pack.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
Fig. 1 is a schematic diagram of functional modules of an embodiment of a parallel battery protection circuit according to the present invention;
fig. 2 is a schematic diagram of a circuit structure of an embodiment of the parallel battery protection circuit of the present invention.
The reference numbers indicate:
the objects, features and advantages of the present invention will be further described with reference to the accompanying drawings.
Detailed Description
The technical solutions in the embodiments of the present invention will be described clearly and completely with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative efforts belong to the protection scope of the present invention.
It should be noted that, if directional indications (such as upper, lower, left, right, front and rear … …) are involved in the embodiment of the present invention, the directional indications are only used to explain the relative position relationship between the components, the motion situation, etc. in a specific posture (as shown in the drawings), and if the specific posture is changed, the directional indications are changed accordingly.
In addition, if there is a description relating to "first", "second", etc. in the embodiments of the present invention, the description of "first", "second", etc. is for descriptive purposes only and is not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the feature. In addition, the technical solutions in the embodiments may be combined with each other, but it must be based on the realization of those skilled in the art, and when the technical solutions are contradictory or cannot be realized, the combination of the technical solutions should not be considered to exist, and is not within the protection scope of the present invention.
The utility model provides a parallelly connected battery protection circuit can prolong electric core life in the parallelly connected group battery 10.
When the existing battery parallel structure is used, the internal resistance of each battery cell in the battery is different in actual use, so that the mutual charging condition among the battery cells can be caused, and the service life of the battery pack is influenced.
Referring to fig. 1, in an embodiment of the present invention, the parallel battery protection circuit includes: the parallel battery pack 10, the detection circuit 20, the control circuit 30, the switch circuit 40 and the load terminal 50;
the parallel battery pack 10 includes a first battery cell 11 and a second battery cell 12, the switch circuit 40 includes a first switch circuit 41 and a second switch circuit 42, the first switch circuit 41 is connected between the first battery cell 11 and the load terminal 50, the second switch circuit 42 is connected between the second battery cell 12 and the load terminal 50, the detection circuit 20 is respectively connected to the first battery cell 11, the second battery cell 12 and the control circuit 30, and the control circuit 30 is respectively connected to the controlled terminal of the first switch circuit 41, the controlled terminal of the second switch circuit 42 and the detection circuit 20;
the detection circuit 20 is configured to detect voltages of the first cell 11 and the second cell 12;
the control circuit 30 is configured to control the first switch circuit 41 to be turned on and the second switch circuit 42 to be turned off when detecting that the voltage of the first battery cell 11 is greater than the voltage of the second battery cell 12, and control the first switch circuit 41 to be turned off and the second switch circuit 42 to be turned on when detecting that the voltage of the first battery cell 11 is less than or equal to the voltage of the second battery cell 12.
Specifically, the parallel battery pack 10 includes a first battery cell 11 and a second battery cell 12, the detection circuit 20 is configured to detect voltages of the first battery cell 11 and the second battery cell 12, when a voltage value of the first battery cell 11 is greater than a voltage value of the second battery cell 12, the control circuit 30 controls the first switch circuit 41 to be turned on, the second switch circuit 42 is turned off, the first battery cell 11 supplies power to the load terminal 50, when the voltage value of the first battery cell 11 is less than or equal to the voltage value of the second battery cell 12, the control circuit 30 controls the first switch circuit 41 to be turned off, the second switch circuit 42 is turned on, and the second battery cell 12 supplies power to the load terminal 50.
In this embodiment, the parallel battery pack 10 includes a first battery cell 11 and a second battery cell 12, where the first battery cell 11 and the second battery cell 12 refer to two adjacent battery cells in the parallel battery pack 10, there are one or more two adjacent battery cells in the parallel battery pack 10, each battery cell is provided with a corresponding switch circuit 40, the switch circuit 40 is connected between the battery cell and the load end 50, and the charging principles of the two adjacent battery cells of the parallel battery pack 10 are the same.
The detection circuit 20 is connected to the first battery cell 11 and the second battery cell 12, and configured to detect voltage values of the first battery cell 11 and the second battery cell 12, and compare the voltage values of the first battery cell 11 and the second battery cell 12.
The control circuit 30 controls the first switch circuit 41 and the second switch circuit 42 to be turned on and off according to the voltage values of the first battery cell 11 and the second battery cell 12 detected and compared by the detection circuit 20, thereby controlling the battery cells to supply power to the load terminal 50, when the voltage value of the first battery cell 11 is greater than that of the second battery cell 12, the control circuit 30 controls the first switch circuit 41 to be turned on, the second switch circuit 42 to be turned off, the first battery cell 11 supplies power to the load end 50, when the voltage value of the first battery cell 11 is less than or equal to the voltage value of the second battery cell 12, the control circuit 30 controls the first switch circuit 41 to be turned off, the second switch circuit 42 is turned on, the second battery cell 12 supplies power to the load terminal 50, and one battery cell can supply power to the load terminal 50, so that two adjacent battery cells can not supply power to the load terminal 50 at the same time, thereby avoiding the occurrence of the mutual charging and discharging of the two adjacent battery cells, in this embodiment, the battery core with a higher voltage value is selected to supply power to the load terminal 50 to meet the power supply requirement.
According to the operating principle of the embodiment, the control circuit 30 controls the outputs of the first battery cell 11 and the second battery cell 12 by controlling the on and off of the first switch circuit 41 and the second switch circuit 42, and the control circuit 30 controls the first switch circuit 41 and the second switch circuit 42 not to be simultaneously turned on, that is, the first battery cell 11 and the second battery cell 12 cannot simultaneously supply power to the load terminal 50, so that the first battery cell 11 and the second battery cell 12 are prevented from being simultaneously supplied power, and mutual charging and discharging between the first battery cell 11 and the second battery cell 12 are avoided.
During operation, when the voltage value of the first battery cell 11 is greater than the voltage value of the second battery cell 12, the first switch circuit 41 is turned on, the second switch circuit 42 is turned off, the first battery cell 11 supplies power to the load terminal 50, and when the voltage value of the first battery cell 11 is less than or equal to the voltage value of the second battery cell 12, the first switch circuit 41 is turned off, the second switch circuit 42 is turned on, and the second battery cell 12 supplies power to the load terminal 50.
The utility model discloses a set up parallelly connected group battery 10, detection circuitry 20, control circuit 30, switch circuit 40 and load end 50, parallelly connected group battery 10 includes first electric core 11 and second electric core 12, switch circuit 40 includes first switch circuit 41 and second switch circuit 42, first switch circuit 41 is connected between first electric core 11 and load end 50, second switch circuit 42 is connected between second electric core 12 and load end 50, detection circuitry 20 is connected with first electric core 11, second electric core 12 and control circuit 30 respectively, control circuit 30 is connected with the controlled end of first switch circuit 41, the controlled end of second switch circuit 42 and detection circuitry 20 respectively; the detection circuit 20 is configured to detect voltages of the first battery cell 11 and the second battery cell 12, the control circuit 30 is configured to, when it is detected that the voltage of the first battery cell 11 is greater than the voltage of the second battery cell 12, control the first switch circuit 41 to be turned on, turn off the second switch circuit 42, supply power to the load terminal 50 through the first battery cell 11, the second battery cell 12 does not supply power to the load terminal 50, and when it is detected that the first chip voltage is less than or equal to the second chip voltage, control the first switch circuit 41 to be turned off, turn on the second switch circuit 42, supply power to the load terminal 50 through the first battery cell 11, supply power to the load terminal 50 through the second battery cell 12, that is, two battery cells in the parallel battery pack 10 cannot supply power to the load terminal 50 at the same time, and the control circuit 30 controls a battery cell with a relatively higher voltage value to supply power to the load terminal 50. Compared with the parallel battery pack 10 in the prior art, the problem that the service life of the battery is influenced due to mutual charging of the battery cells in the parallel battery pack 10 is solved by arranging the protection circuit.
Referring to fig. 1, in an embodiment, the detection circuit 20 is further connected to the load terminal 50, and when the voltage of the load terminal 50 is greater than the voltage of the first battery cell 11 and the voltage of the second battery cell 12, the control circuit 30 controls both the first switch circuit 41 and the second switch circuit 42 to be turned off.
It can be understood that, when the battery cell is used to supply power to the load terminal 50, the voltage value of the battery cell is smaller than that of the load terminal 50, and when the voltage value of the battery cell is larger than that of the load terminal 50, the load terminal 50 may discharge electricity to the battery cell, so as to damage the battery cell.
In this embodiment, the detection circuit 20 is connected to the first battery cell 11, the second battery cell 12, and the load end 50, and is configured to detect voltage values of the first battery cell 11, the second battery cell 12, and the load end 50, when the detection circuit 20 detects that the voltage of the load end 50 is greater than the voltage of the first battery cell 11 and the voltage of the second battery cell 12, the control circuit 30 controls the first switch circuit 41 and the second switch circuit 42 to be both turned off, the higher voltage of the first battery cell 11 and the second battery cell 12 supplies power to the load end 50, the voltage of the load end 50 is greater than the voltage values of the first battery cell 11 and the second battery cell 12, that is, the voltage of the load end 50 is greater than the voltage of the higher battery cell, at this time, the control circuit 30 controls the switch circuit 40 to be both turned off, so as to avoid a situation that the load end 50 may discharge to the battery cells.
Referring to fig. 1, in an embodiment, the parallel battery protection circuit further includes a charging circuit 60, where the charging circuit 60 is connected to the detection circuit 20, the first cell 11, and the second cell 12 respectively;
the detection circuit 20 is further configured to detect an input voltage of the charging circuit 60;
the control circuit 30 is configured to control both the first switch circuit 41 and the second switch circuit 42 to be turned off when the input voltage of the charging circuit 60 detected by the detection circuit 20 is greater than a preset voltage value.
In this embodiment, the charging circuit 60 is configured to charge the first battery cell 11 and the second battery cell 12, and when a certain voltage is input into the charging circuit 60, the charging circuit 60 charges the first battery cell 11 and the second battery cell 12, the first switch circuit 41 and the second switch circuit 42 are turned off, and the first battery cell 11 and the second battery cell 12 do not supply power to the load terminal 50.
Referring to fig. 1, the control circuit 30 is further connected to a controlled terminal of the charging circuit 60, the detection circuit 20 is further configured to detect an abnormal operating state of the first battery cell 11 and the second battery cell 12, and the control circuit 30 is further configured to control the first switch circuit 41 and the charging circuit 60 to be turned off when the detection circuit 20 detects that the first battery cell 11 is in an abnormal state, and control the second switch circuit 42 and the charging circuit 60 to be turned off when the detection circuit 20 detects that the second battery cell 12 is in an abnormal state.
In this embodiment, the detection is also used to detect other information of the first battery cell 11 and the second battery cell 12, such as temperature, electric quantity, and the like, and when the first battery cell 11 and the second battery cell 12 are detected to be abnormal in operation, the control circuit 30 controls the charging circuit 60, the first switch circuit 41, and the second switch circuit 42 to be turned off, so as to avoid damaging the battery cells.
Referring to fig. 1, the parallel battery pack 10 is provided in plurality, and the switching circuit 40 is provided in plurality corresponding to the parallel battery pack 10.
In this embodiment, the first battery cell 11 and the second battery cell 12 refer to two adjacent battery cells in the parallel battery pack 10, each battery cell is provided with the corresponding switch circuit 40 between the load ends 50, and all technical solutions of all the embodiments are adopted, so that at least all beneficial effects brought by the technical solutions of the embodiments are achieved, and details are not repeated here.
Referring to fig. 2, in an embodiment, the control circuit 30 and the detection circuit 20 are integrated on the same main control chip U1, the main control chip U1 includes a first cell detection end SMB1, a second cell detection end SMB2, a first cell detection end BAT1_ EN, a second cell control end BAT2_ EN, and a load end 50 detection end, the first cell detection end SMB1 is connected to the first cell 11, the second cell detection end SMB2 is connected to the second cell 12, the first cell detection end BAT1_ EN is connected to the controlled end of the first switch circuit 41, the second cell control end BAT2_ EN is connected to the controlled end of the second switch circuit 42, and the load end 50 detection end is connected to the load end 50.
In this embodiment, the first battery cell 11 is BAT _1, the second battery cell 12 is BAT _2, the first battery cell detection end SMB1 and the second battery cell detection end SMB2 are respectively configured to detect voltage values of the first battery cell 11 and the second battery cell 12, when it is detected that the voltage of the first battery cell 11 is greater than the voltage of the second battery cell 12, the first battery cell detection end BAT1_ EN controls the first switch circuit 41 to be turned on, the second battery cell control end BAT2_ EN controls the second switch circuit 42 to be turned off, when it is detected that the voltage of the first battery cell 11 is less than or equal to the voltage of the second battery cell 12, the first battery cell detection end BAT1_ EN controls the first switch circuit 41 to be turned off, and the second battery cell control end BAT2_ EN controls the second switch circuit 42 to be turned on.
Referring to fig. 2, in an embodiment, the first switch circuit 41 includes a first MOS transistor Q1 and a first capacitor C1, the first MOS transistor Q1 is an N-type MOS transistor, a source of the first MOS transistor Q1 is connected to the first ends of the first cell 11 and the first capacitor C1, a gate of the first MOS transistor Q1 is connected to the first cell detection terminal BAT1_ EN and the second end of the first capacitor C1, and a drain of the first MOS transistor Q1 is connected to the load terminal 50.
In this embodiment, the load terminal is VSYS, the gate of the first MOS transistor Q1 is the control terminal of the first switch circuit 41, the gate of the first MOS transistor Q1 is at high level, the first MOS transistor Q1 is turned on, the first switch circuit 41 is turned on, the gate of the first MOS transistor Q1 is at low level, the first MOS transistor Q1 is turned off, and the first switch circuit 41 is turned off.
Referring to fig. 2, in an embodiment, the second switch circuit 42 includes a first MOS transistor Q2 and a second capacitor C2, the first MOS transistor Q2 is an N-type MOS transistor, a source of the first MOS transistor Q2 is respectively connected to first ends of the second cell 12 and the second capacitor C2, a gate of the first MOS transistor Q2 is connected to second ends of the second cell control terminal BAT2_ EN and the second capacitor C2, and a drain of the first MOS transistor Q2 is connected to the load terminal 50.
In this embodiment, the load terminal is VSYS, the gate of the first MOS transistor Q2 is the control terminal of the second switch circuit 42, the gate of the first MOS transistor Q2 is at high level, the first MOS transistor Q2 is turned on, the second switch circuit 42 is turned on, the gate of the first MOS transistor Q2 is at low level, the first MOS transistor Q2 is turned off, and the second switch circuit 42 is turned off.
Referring to fig. 2, IN an embodiment, the main control chip U1 further includes a charging circuit detection terminal AC _ OK, a charging circuit control terminal AC _ EN and a load detection terminal VSYS _ IN, the charging circuit detection terminal AC _ OK is connected to the charging circuit 60, the charging circuit control terminal AC _ EN is connected to the controlled terminal of the charging circuit 60, and the load detection terminal VSYS _ IN is connected to the load terminal 50.
IN this embodiment, the input end of the charging circuit 60 is VOUT _ LTC, the charging circuit detection end AC _ OK is configured to detect an input voltage of the charging circuit 60, when the input voltage of the charging circuit 60 detected by the detection circuit 20 is greater than a preset voltage value, the first switch circuit 41 and the second switch circuit 42 are controlled to be both turned off, the charging circuit control end AC _ EN is configured to control an output of the charging circuit 60, when it is detected that the first battery cell 11 or the second battery cell 12 is IN an abnormal operating state, the charging circuit 60 is controlled to be turned off, the load detection end VSYS _ IN is configured to detect a voltage of the load end 50, and when the detected voltage of the load end 50 is greater than voltages of the first battery cell 11 and the second battery cell 12, the first switch circuit 41 and the second switch circuit 42 are both controlled to be turned off.
The utility model provides a power supply unit.
This power supply unit includes as above parallelly connected battery protection circuit, and this parallelly connected battery protection circuit's concrete structure refers to above-mentioned embodiment, because the utility model discloses power supply unit has adopted the whole technical scheme of above-mentioned all embodiments, consequently has all beneficial effects that the technical scheme of above-mentioned embodiment brought at least, and the repeated description is no longer repeated here one by one.
The above is only the optional embodiment of the present invention, and not therefore the limit to the patent scope of the present invention, all the concepts of the present invention utilize the equivalent structure transformation of the content of the specification and the attached drawings, or the direct/indirect application in other related technical fields is included in the patent protection scope of the present invention.
Claims (10)
1. A parallel battery protection circuit, comprising: the device comprises a parallel battery pack, a detection circuit, a control circuit, a switch circuit and a load end;
the parallel battery pack comprises a first battery cell and a second battery cell, the switch circuit comprises a first switch circuit and a second switch circuit, the first switch circuit is connected between the first battery cell and the load end, the second switch circuit is connected between the second battery cell and the load end, the detection circuit is respectively connected with the first battery cell, the second battery cell and the control circuit, and the control circuit is respectively connected with the controlled end of the first switch circuit, the controlled end of the second switch circuit and the detection circuit;
the detection circuit is configured to detect voltages of the first cell and the second cell;
the control circuit is configured to control the first switch circuit to be turned on and the second switch circuit to be turned off when detecting that the voltage of the first battery cell is greater than the voltage of the second battery cell, and control the first switch circuit to be turned off and the second switch circuit to be turned on when detecting that the voltage of the first battery cell is less than or equal to the voltage of the second battery cell.
2. The parallel battery protection circuit of claim 1, the detection circuit further connected to the load terminal, and the control circuit controls both the first switch circuit and the second switch circuit to turn off when the voltage at the load terminal is greater than both the voltage at the first cell and the voltage at the second cell.
3. The parallel battery protection circuit of claim 1, further comprising a charging circuit coupled to the detection circuit, the first cell, and the second cell, respectively;
the detection circuit is also used for detecting the input voltage of the charging circuit;
the control circuit is used for controlling the first switch circuit and the second switch circuit to be switched off when the input voltage of the charging circuit detected by the detection circuit is larger than a preset voltage value.
4. The parallel battery protection circuit of claim 3, wherein the control circuit is further connected to a controlled terminal of the charging circuit, the detection circuit is further configured to detect an abnormal operating state of a first battery cell and a second battery cell, and the control circuit is further configured to control the first switch circuit and the charging circuit to be turned off when the detection circuit detects that the first battery cell is in an abnormal state, and control the second switch circuit and the charging circuit to be turned off when the detection circuit detects that the second battery cell is in an abnormal state.
5. The parallel battery protection circuit according to any one of claims 1 to 4, wherein a plurality of the parallel battery packs are provided, and a plurality of the switching circuits are provided corresponding to the parallel battery packs.
6. The parallel battery protection circuit of claim 1, wherein the control circuit and the detection circuit are integrated on a same main control chip, the main control chip comprises a first cell detection end, a second cell detection end, a first cell control end, a second cell control end, and a load end detection end, the first cell detection end is connected to the first cell, the second cell detection end is connected to the second cell, the first cell control end is connected to the controlled end of the first switch circuit, the second cell control end is connected to the controlled end of the second switch circuit, and the load end detection end is connected to the load end.
7. The parallel battery protection circuit of claim 5, wherein the first switch circuit comprises a first MOS transistor and a first capacitor, the first MOS transistor is an N-type MOS transistor, a source of the first MOS transistor is connected to the first cell and a first end of the first capacitor, respectively, a gate of the first MOS transistor is connected to the first cell control end and a second end of the first capacitor, respectively, and a drain of the first MOS transistor is connected to the load end.
8. The parallel battery protection circuit of claim 5, wherein the second switch circuit comprises a second MOS transistor and a second capacitor, the second MOS transistor is an N-type MOS transistor, a source of the second MOS transistor is connected to the second electrical core and a first end of the second capacitor, respectively, a gate of the second MOS transistor is connected to the second electrical core control end and a second end of the second capacitor, respectively, and a drain of the second MOS transistor is connected to the load end.
9. The parallel battery protection circuit of claim 6, wherein the main control chip further comprises a charging circuit detection terminal, a charging circuit control terminal and a load detection terminal, the charging circuit detection terminal is connected with the charging circuit, the charging circuit control terminal is connected with the controlled terminal of the charging circuit, and the load detection terminal is connected with the load terminal.
10. A power supply arrangement, characterized in that it comprises a parallel battery protection circuit according to any one of claims 1 to 9.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220350647.7U CN217240368U (en) | 2022-02-21 | 2022-02-21 | Parallel battery protection circuit and power supply device |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202220350647.7U CN217240368U (en) | 2022-02-21 | 2022-02-21 | Parallel battery protection circuit and power supply device |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN217240368U true CN217240368U (en) | 2022-08-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202220350647.7U Active CN217240368U (en) | 2022-02-21 | 2022-02-21 | Parallel battery protection circuit and power supply device |
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| Country | Link |
|---|---|
| CN (1) | CN217240368U (en) |
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2022
- 2022-02-21 CN CN202220350647.7U patent/CN217240368U/en active Active
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