CN214542326U - Battery management system, battery pack and electric device - Google Patents
Battery management system, battery pack and electric device Download PDFInfo
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- CN214542326U CN214542326U CN202023222977.8U CN202023222977U CN214542326U CN 214542326 U CN214542326 U CN 214542326U CN 202023222977 U CN202023222977 U CN 202023222977U CN 214542326 U CN214542326 U CN 214542326U
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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
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- Y02E60/10—Energy storage using batteries
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Abstract
The embodiment of the application discloses battery management system, battery pack and electric device. The battery management system comprises a first connecting end, a second connecting end, a first optical coupler, a second optical coupler, a first one-way switch and a second one-way switch, wherein the first optical coupler comprises a first photoelectric triode, the second optical coupler comprises a second photoelectric triode, the first photoelectric triode is reversely connected with the first one-way switch in parallel, the second photoelectric triode is reversely connected with the second one-way switch in parallel, the reversely connected first photoelectric triode and the first one-way switch are connected in parallel, and the reversely connected second photoelectric triode and the second one-way switch are connected between the first connecting end and the second connecting end in series. Through the mode, the bidirectional conduction function with isolation can be realized, and the low cost can be achieved.
Description
Technical Field
The embodiment of the application relates to the technical field of electronic circuits, in particular to a battery management system, a battery pack and an electric device.
Background
A Battery Management System (BMS), commonly referred to as a battery caregiver or battery manager, is mainly used to intelligently manage and maintain each battery cell, prevent overcharge and overdischarge of the battery, prolong the service life of the battery, and monitor the state of the battery. In a battery management system, connection to an external device is generally performed through a dry contact for signal transmission, communication, and the like.
The dry contact circuit is a non-polar electrical switch, and due to the non-polar characteristic, the positions of two contacts of the electrical switch can be mutually exchanged when the two contacts are connected on a circuit. The dry contact circuit can be connected with a relay, a buzzer, an LED lamp or other functional circuits, and the working state of the functional circuits is determined by controlling the state of the electric switch.
The dry contact circuit realizes that nonpolarity is based on the bidirectional conduction function, benefits from MOS type opto-coupler itself to possess the bidirectional conduction function, makes present dry contact circuit generally design around MOS type opto-coupler, however, the cost of MOS type opto-coupler is generally higher, makes the cost of the dry contact circuit based on MOS type opto-coupler rise, thereby causes the also corresponding rise of cost of whole battery management system, and then makes the market competitiveness of product descend.
Disclosure of Invention
In order to solve the technical problem, an embodiment of the application provides a battery management system, a battery pack and an electric device, which can solve the technical problem that the battery management system is not high in competitiveness because the battery management system uses a dry contact circuit based on a MOS optocoupler and the cost is too high in the prior art.
The embodiment of the application provides the following technical scheme for solving the technical problems:
in a first aspect, an embodiment of the present application provides a battery management system, which includes a first control end, a second control end, a first connection end, a second connection end, a first optocoupler, a second optocoupler, a first unidirectional switch, and a second unidirectional switch; the first optocoupler comprises a first light emitting diode and a first phototriode, and the second optocoupler comprises a second light emitting diode and a second phototriode; anodes of the first light-emitting diode and the second light-emitting diode are both connected with the first control end, cathodes of the first light-emitting diode and the second light-emitting diode are both connected with the second control end, and starting voltage is applied between the first control end and the second control end; the first photoelectric triode and the first one-way switch are reversely connected in parallel, and the second photoelectric triode and the second one-way switch are reversely connected in parallel; the first photoelectric triode and the first one-way switch which are connected in parallel in the reverse direction, and the second photoelectric triode and the second one-way switch which are connected in parallel in the reverse direction are connected in series between a first connecting end and a second connecting end.
Optionally, an emitter of the first phototriode, an input end of the first unidirectional switch, an emitter of the second phototriode, and an input end of the second unidirectional switch are connected together; the collector of the first photoelectric triode and the output end of the first one-way switch are both connected with a first connecting end; and the collector of the second photoelectric triode and the output of the second one-way switch are both connected with a second connecting end.
Optionally, the emitter of the first phototriode and the input end of the first unidirectional switch are both connected to a first connection end; the collector of the first photoelectric triode, the output end of the first one-way switch, the collector of the second photoelectric triode and the output end of the second one-way switch are connected together; and the emitter of the second photoelectric triode and the input end of the second one-way switch are connected with a second connecting end.
Optionally, the first unidirectional switch is a first diode, an anode of the first diode is an input end of the first unidirectional switch, and a cathode of the first diode is an output end of the first unidirectional switch.
Optionally, the second unidirectional switch is a second diode, an anode of the second diode is an input end of the second unidirectional switch, and a cathode of the second diode is an output end of the second unidirectional switch.
Optionally, the first unidirectional switch is a third optocoupler, and the third optocoupler includes a third light emitting diode and a third phototransistor; a starting voltage is applied between the anode and the cathode of the third light emitting diode, the collector of the third phototransistor is the input end of the first unidirectional switch, and the emitter of the third phototransistor is the output end of the first unidirectional switch.
Optionally, the second unidirectional switch is a fourth optocoupler, and the fourth optocoupler includes a fourth light emitting diode and a fourth phototransistor; and a starting voltage is applied between the anode and the cathode of the fourth light-emitting diode, the collector of the fourth phototriode is the input end of the second unidirectional switch, and the emitter of the fourth phototriode is the output end of the second unidirectional switch.
Optionally, the first optical coupler and the second optical coupler are bipolar junction transistor type optical couplers.
In a second aspect, embodiments of the present application provide a battery pack, including the battery management system as described above; and the battery module is connected with the battery management system.
In a third aspect, embodiments of the present application provide an electric device, including the battery pack as described above; and the battery pack is used for supplying power to the load.
Optionally, the power utilization device comprises an energy storage product, an unmanned aerial vehicle, an electric tool or an electric vehicle.
The beneficial effects of the embodiment of the application are that: different from the related art, the battery management system, the battery pack and the electric device are provided. The battery management system comprises a first connecting end, a second connecting end, a first optical coupler, a second optical coupler, a first one-way switch and a second one-way switch, wherein the first optical coupler comprises a first photoelectric triode, the second optical coupler comprises a second photoelectric triode, the first photoelectric triode is reversely connected with the first one-way switch in parallel, the second photoelectric triode is reversely connected with the second one-way switch in parallel, the reversely connected first photoelectric triode and the first one-way switch are connected in parallel, and the reversely connected second photoelectric triode and the second one-way switch are connected between the first connecting end and the second connecting end in series. Through the mode, the bidirectional conduction function with isolation can be realized, and the low cost can be achieved.
Drawings
The embodiments are illustrated by way of example only in the accompanying drawings, in which like reference numerals refer to similar elements and which are not to be construed as limiting the embodiments, and in which the figures are not to scale unless otherwise specified.
Fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present disclosure;
fig. 2 is a schematic diagram illustrating an application scenario of a dry junction circuit according to an embodiment of the present disclosure;
FIG. 3 is a schematic diagram of a dry contact circuit according to an embodiment of the present disclosure;
FIG. 4 is a schematic diagram of the bidirectional conducting circuit provided in FIG. 3;
FIG. 5 is a schematic diagram of the structure of FIG. 3 providing an alternative bidirectional conduction circuit;
fig. 6 to 9 are schematic structural diagrams of a bidirectional conducting circuit provided in fig. 4;
fig. 10 to 13 are schematic structural diagrams of another bidirectional conducting circuit provided in fig. 4.
Detailed Description
To facilitate an understanding of the present application, the present application is described in more detail below with reference to the accompanying drawings and detailed description. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may be present. Furthermore, the terms "first," "second," "third," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs. The terminology used in the description of the present application is for the purpose of describing particular embodiments only and is not intended to be limiting of the present application. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a battery pack according to an embodiment of the present disclosure. As shown in fig. 1, the battery pack 100 includes a battery management system 10 and a battery module 20, and the battery management system 10 is connected to the battery module 20 in a CAN bus connection.
The battery pack 100 corresponds to an energy storage system, and the battery module 20 serves as an energy storage unit of the energy storage system, wherein the battery module 20 may be composed of a plurality of energy storage batteries, and the battery module 20 is configured to upload various real-time operation status information of the energy storage batteries, such as battery voltage, current, temperature, protection amount, and the like, to the battery management system 10 through the CAN bus, and receive a control command from the battery management system 10. The battery management system 10 is configured to receive and monitor various real-time operating status information from the battery module 20, and transmit the information to the outside, or process the information to evaluate the status of the battery module 20 and perform safety protection on the energy storage battery, etc.
As shown in fig. 2, the battery management system 10 includes a dry contact circuit 11. The dry contact circuit 11 is an isolated control switch, and when the control switch is connected to an external circuit, the operating state of the external circuit can be controlled by controlling the switching state of the control switch.
For example, the external circuit includes a photo sensor switch OPT and an LED lamp, the photo sensor switch OPT includes a light emitting diode and a photo transistor, a cathode of the light emitting diode is grounded, an anode of the light emitting diode is connected to one contact of the dry contact circuit 11, another contact of the dry contact circuit 11 is connected to an anode of the LED lamp, a cathode of the LED lamp is connected to a collector of the photo transistor, and an emitter of the photo transistor is grounded.
When the dry contact circuit 11 conducts the two contacts, the light emitting diode has current flowing through to generate light, so that the phototriode is conducted, and at the moment, the LED lamp has current flowing through to emit light; when the dry contact circuit 11 is disconnected with the two contacts, the light emitting diode has no current and cannot generate light, so that the phototriode cannot be conducted, and at the moment, the LED lamp has no current and cannot emit light.
Specifically, as shown in fig. 3, the dry contact circuit 11 includes a bidirectional conduction circuit 111, a controller 112, and a driving circuit 113. The driving circuit 113 is connected to the controller 112 and the bidirectional conducting circuit 111, respectively, and the driving circuit 113 can drive the bidirectional conducting circuit 111 to be turned on and off according to a control signal output by the controller 112.
As shown in fig. 4, the bidirectional conducting circuit 111 includes a first control terminal a1, a second control terminal a2, a first connection terminal B1, a second connection terminal B2, a first optocoupler U1, a second optocoupler U2, a first unidirectional switch S1, and a second unidirectional switch S2.
The first optocoupler U1 includes a first light emitting diode D1 and a first phototransistor Q1, and the second optocoupler U2 includes a second light emitting diode D2 and a second phototransistor Q2.
Anodes of the first light emitting diode D1 and the second light emitting diode D2 are both connected to the first control terminal a1, cathodes of the first light emitting diode D1 and the second light emitting diode D2 are both connected to the second control terminal a2, and a start voltage is applied between the first control terminal a1 and the second control terminal a 2.
The first phototriode Q1 and the first one-way switch S1 are connected in reverse in parallel, the second phototriode Q2 and the second one-way switch S2 are connected in reverse in parallel, the first phototriode Q1 and the first one-way switch S1 are connected in reverse in parallel, and the second phototriode Q2 and the second one-way switch S2 are connected in series between the first connection terminal B1 and the second connection terminal B2.
The anti-parallel connection means that when current flows through two parallel terminals connected in parallel, current can only flow through one of the devices at the same time, for example, when the first phototransistor Q1 and the first unidirectional switch S1 are connected in anti-parallel, when current flows through two parallel terminals connected in parallel, current can only flow through the first phototransistor Q1 at the same time without flowing through the first unidirectional switch S1, or current can only flow through the first unidirectional switch S1 without flowing through the first phototransistor Q1. The same is true when the second phototransistor Q2 and the second unidirectional switch S2 are connected in anti-parallel, and thus, the details are not repeated here.
When the start voltage is applied between the first control terminal a1 and the second control terminal a2, the first light emitting diode D1 and the second light emitting diode D2 both have current flowing through them to generate light, and the first phototransistor Q1 and the second phototransistor Q2 are turned on after receiving the light.
After the first phototriode Q1 and the second phototriode Q2 are turned on, because the first phototriode Q1 and the first one-way switch S1 are connected in parallel in an inverse direction, the second phototriode Q2 and the second one-way switch S2 are also connected in parallel in an inverse direction, and the two are connected in series between the first connection end B1 and the second connection end B2 after being connected in parallel, two current paths are formed between the first connection end B1 and the second connection end B2, wherein a current of one current path passes through the first phototriode Q1 and the second one-way switch S2, and a current of the other current path passes through the first one-way switch S1 and the second phototriode Q2.
When a voltage difference exists between the first connection terminal B1 and the second connection terminal B2, the first connection terminal B1 and the second connection terminal B2 realize the circulation of current through one of the current paths, so that bidirectional conduction can be realized, and the polarity is non-polar, that is, the first connection terminal B1 and the second connection terminal B2 can be interchanged when being connected to a line. In addition, since the current passes through one optocoupler regardless of which path the current flows through, the bidirectional conduction circuit 111 also has an isolation function. Therefore, the bidirectional conduction circuit 111 can be equivalent to a MOS type opto-coupler.
When the starting voltage is not applied between the first control terminal a1 and the second control terminal a2, it can be understood that the first connection terminal B1 and the second connection terminal B2 are disconnected.
In this embodiment, when reasonable type selection can be performed through the first optical coupler U1, the second optical coupler U2, the first one-way switch S1 and the second one-way switch S2, the overall cost can be greatly reduced compared with the MOS type optical couplers, and the performance of the bidirectional conduction circuit 111 can be further optimized.
In some embodiments, the first optical coupler U1 and the second optical coupler U2 are both BJT (bipolar junction transistor) type optical couplers. In order to improve the performance of the bidirectional conducting circuit 111, in some embodiments, the model of the BJT type optocoupler is TLP240A, and the voltage withstanding value of the BJT type optocoupler is 80V, which is higher than that of a general MOS type optocoupler having a voltage withstanding value of 60V.
Specifically, as shown in fig. 4, the driving circuit 113 includes a first resistor R1, a second resistor R2 and an NPN transistor Q, when controlling whether to apply a start voltage between the first control terminal a1 and the second control terminal a2 to determine whether to turn on or off the connection between the first control terminal a1 and the second control terminal a 2.
One end of the first resistor R1 is connected to the controller 112, the other end of the first resistor R1 is connected to one end of the second resistor R2 and the base of the NPN transistor Q, the other end of the second resistor R2 and the emitter of the NPN transistor Q are grounded, the collector of the NPN transistor Q is connected to the cathodes of the first and second light emitting diodes D1 and D2, and the cathodes of the first and second light emitting diodes D1 and D2 are connected to the positive electrode of the start voltage.
When the controller 112 outputs a high level, the NPN transistor Q is turned on, such that the cathodes of the first and second light emitting diodes D1 and D2 are grounded, which is equivalent to a start voltage applied between the anodes and cathodes of the first and second light emitting diodes D1 and D2, so that the first and second light emitting diodes D1 and D2 have current flowing therethrough to emit light, and the first and second phototransistors Q1 and Q2 are turned on after receiving the light, and at this time, the bidirectional conduction circuit 111 operates to conduct the first connection terminal B1 and the second connection terminal B2.
When the controller 112 outputs a low level, it is understood that the first phototransistor Q1 and the second phototransistor Q2 are not turned on, and the bidirectional conducting circuit 111 does not operate and disconnects the first connection terminal B1 from the second connection terminal B2.
As for the bidirectional conducting circuit 11, more specifically, as shown IN fig. 4, the emitter of the first phototransistor Q1, the input terminal S1_ IN of the first unidirectional switch S1, the emitter of the second phototransistor Q2, and the input terminal S2_ IN of the second unidirectional switch S2 are commonly connected, the collector of the first phototransistor Q1 and the output terminal S1_ OUT of the first unidirectional switch S1 are both connected to the first connection terminal B1, and the collector of the second phototransistor Q2 and the output terminal S2_ OUT of the second unidirectional switch S2 are both connected to the second connection terminal B2.
In the present embodiment, when the bidirectional conducting circuit 111 is operated, when the voltage of the first connection terminal B1 is higher than the voltage of the second connection terminal B2, a current path is formed in which a current flows through the first connection terminal B1, the first optocoupler U1, the second unidirectional switch S2 and the second connection terminal B2 in sequence; when the voltage of the second connection terminal B2 is higher than the voltage of the first connection terminal B1, a current path is formed in which a current flows through the second connection terminal B2, the second optocoupler U2, the first unidirectional switch S1 and the first connection terminal B1 in sequence. Therefore, it can achieve bidirectional conduction.
For example, IN some embodiments, as shown IN fig. 5, the emitter of the first phototransistor Q1 and the input terminal S1_ IN of the first unidirectional switch S1 are connected to the first connection terminal B1, the collector of the first phototransistor Q1, the output terminal S1_ OUT of the first unidirectional switch S1, the collector of the second phototransistor Q2 and the output terminal S2_ OUT of the second unidirectional switch S2 are commonly connected, and the emitter of the second phototransistor Q2 and the input terminal S2_ IN of the second unidirectional switch S2 are connected to the second connection terminal B2.
In the present embodiment, when the bidirectional conducting circuit 111 is operated, when the voltage of the first connection terminal B1 is higher than the voltage of the second connection terminal B2, a current path is formed in which a current flows through the first connection terminal B1, the first unidirectional switch S1, the second optocoupler U2 and the second connection terminal B2 in sequence; when the voltage of the second connection terminal B2 is higher than the voltage of the first connection terminal B1, a current path is formed in which a current flows through the second connection terminal B2, the second unidirectional switch S2, the first optocoupler U1 and the first connection terminal B1 in sequence. Therefore, it can achieve bidirectional conduction.
The first unidirectional switch S1 acts as a unidirectional conducting device that only allows current to flow from the output terminal to the output terminal, but not from the output terminal to the input terminal. The first unidirectional switch S1 may include any electronic switch tube or switch device capable of achieving unidirectional conduction, for example, IN some embodiments, as shown IN fig. 6, the first unidirectional switch S1 is a first diode D3, the anode of the first diode D3 is the input terminal S1_ IN of the first unidirectional switch S1, and the cathode of the first diode D3 is the output terminal S1_ OUT of the first unidirectional switch S1.
For another example, IN some embodiments, as shown IN fig. 7, the first unidirectional switch S1 is a third optocoupler U3, the third optocoupler U3 includes a third light emitting diode D4 and a third phototransistor Q4, an anode and a cathode of the third light emitting diode Q4 are used for applying the start voltage, a collector of the third phototransistor Q4 is an input terminal S1_ IN of the first unidirectional switch S1, and an emitter of the third phototransistor Q4 is an output terminal S1_ OUT of the first unidirectional switch S1.
The second unidirectional switch S2 has the same characteristics as the first unidirectional switch S1, and therefore, the second unidirectional switch S2 may include any electronic switching tube or switching device capable of achieving unidirectional conduction, for example, as shown IN fig. 8, the second unidirectional switch S2 is a second diode D5, the anode of the second diode D5 is the input terminal S2_ IN of the first unidirectional switch S2, and the cathode of the second diode D2 is the output terminal S2_ OUT of the second unidirectional switch S2.
For another example, as shown IN fig. 9, the second unidirectional switch S2 is a fourth optocoupler U4, the fourth optocoupler U4 includes a fourth light emitting diode D6 and a fourth phototransistor Q5, a start voltage is applied between an anode and a cathode of the fourth light emitting diode D6, a collector of the fourth phototransistor Q5 is an input terminal S2_ IN of the second unidirectional switch S2, and an emitter of the fourth phototransistor Q5 is an output terminal S2_ OUT of the second unidirectional switch S2.
It will be appreciated that a number of different variations are possible when the first unidirectional switch S1 and the second unidirectional switch S2 are combined.
As shown in fig. 10, the first unidirectional switch S1 is a diode, and the second unidirectional switch S2 is also a diode.
As shown in fig. 11, the first unidirectional switch S1 is a diode, and the second unidirectional switch S2 is an optocoupler.
As shown in fig. 12, the first unidirectional switch S1 is an opto-coupler and the second unidirectional switch S2 is a diode.
As shown in fig. 13, the first unidirectional switch S1 is an optocoupler, and the second unidirectional switch S2 is also an optocoupler.
For the specific operation process of the bidirectional conduction circuit shown in fig. 10 to 13, reference may be made to the above embodiments, which are not repeated herein, and it should be noted that fig. 10 to 13 only show some modifications of the bidirectional conduction circuit, and any other suitable modifications of the bidirectional conduction circuit may also exist on the basis of not departing from the technical concept or spirit of the present invention, and all such modifications should fall within the protection scope of the present application.
As another aspect of the embodiments of the present application, an electric device is provided, which includes the battery pack 100 as described above and a load, and the battery pack 100 is used for supplying power to the load.
In some embodiments, the powered device includes an energy storage product, a drone, a power tool, and an electric vehicle.
Finally, it is noted that the present application may be embodied in many different forms and is not limited to the embodiments described herein, which are not intended as additional limitations to the present disclosure, which are provided for the purpose of providing a more thorough understanding of the present disclosure. In the context of the present application, the above features, combined with one another and in many other variations, which are different from the above-described aspects of the present application, are to be considered as within the scope of the present specification; further, modifications and variations may occur to those skilled in the art in light of the foregoing description, and it is intended to cover all such modifications and variations as fall within the scope of the appended claims.
Claims (11)
1. A battery management system is characterized by comprising a first control end, a second control end, a first connecting end, a second connecting end, a first optical coupler, a second optical coupler, a first one-way switch and a second one-way switch;
the first optocoupler comprises a first light emitting diode and a first phototriode, and the second optocoupler comprises a second light emitting diode and a second phototriode;
anodes of the first light-emitting diode and the second light-emitting diode are both connected with the first control end, cathodes of the first light-emitting diode and the second light-emitting diode are both connected with the second control end, and starting voltage is applied between the first control end and the second control end;
the first photoelectric triode and the first one-way switch are reversely connected in parallel, and the second photoelectric triode and the second one-way switch are reversely connected in parallel;
the first photoelectric triode and the first one-way switch which are connected in parallel in the reverse direction, and the second photoelectric triode and the second one-way switch which are connected in parallel in the reverse direction are connected in series between a first connecting end and a second connecting end.
2. The battery management system of claim 1,
the emitter of the first photoelectric triode, the input end of the first unidirectional switch, the emitter of the second photoelectric triode and the input end of the second unidirectional switch are connected together;
the collector of the first photoelectric triode and the output end of the first one-way switch are both connected with a first connecting end;
and the collector of the second photoelectric triode and the output end of the second one-way switch are connected with a second connecting end.
3. The battery management system of claim 1,
the emitter of the first photoelectric triode and the input end of the first one-way switch are both connected with a first connecting end;
the collector of the first photoelectric triode, the output end of the first one-way switch, the collector of the second photoelectric triode and the output end of the second one-way switch are connected together;
and the emitter of the second photoelectric triode and the input end of the second one-way switch are connected with a second connecting end.
4. The battery management system of any of claims 1-3, wherein the first unidirectional switch is a first diode, an anode of the first diode is an input of the first unidirectional switch, and a cathode of the first diode is an output of the first unidirectional switch.
5. The battery management system of any of claims 1-3, wherein the second unidirectional switch is a second diode, an anode of the second diode is an input of the second unidirectional switch, and a cathode of the second diode is an output of the second unidirectional switch.
6. The battery management system according to any one of claims 1-3, wherein the first unidirectional switch is a third optocoupler, the third optocoupler including a third light emitting diode and a third phototransistor;
a starting voltage is applied between the anode and the cathode of the third light emitting diode, the collector of the third phototransistor is the input end of the first unidirectional switch, and the emitter of the third phototransistor is the output end of the first unidirectional switch.
7. The battery management system according to any one of claims 1-3, wherein the second unidirectional switch is a fourth optocoupler, the fourth optocoupler including a fourth light emitting diode and a fourth phototransistor;
and a starting voltage is applied between the anode and the cathode of the fourth light-emitting diode, the collector of the fourth phototriode is the input end of the second unidirectional switch, and the emitter of the fourth phototriode is the output end of the second unidirectional switch.
8. The battery management system of any of claims 1-3, wherein the first and second optocouplers are bipolar junction transistor-type optocouplers.
9. A battery pack characterized by comprising the battery management system according to any one of claims 1 to 8; and
and the battery module is connected with the battery management system.
10. An electric device comprising the battery pack according to claim 9; and
a load, the battery pack being configured to power the load.
11. The powered device of claim 10, comprising an energy storage product, a drone, a power tool, or an electric vehicle.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023222977.8U CN214542326U (en) | 2020-12-28 | 2020-12-28 | Battery management system, battery pack and electric device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202023222977.8U CN214542326U (en) | 2020-12-28 | 2020-12-28 | Battery management system, battery pack and electric device |
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| CN214542326U true CN214542326U (en) | 2021-10-29 |
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