CN113489104A - Protection circuit, battery management system and battery pack - Google Patents
Protection circuit, battery management system and battery pack Download PDFInfo
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- CN113489104A CN113489104A CN202110794033.8A CN202110794033A CN113489104A CN 113489104 A CN113489104 A CN 113489104A CN 202110794033 A CN202110794033 A CN 202110794033A CN 113489104 A CN113489104 A CN 113489104A
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- battery pack
- switch unit
- main control
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- protection circuit
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/0031—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits using battery or load disconnect circuits
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00308—Overvoltage protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0029—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with safety or protection devices or circuits
- H02J7/00309—Overheat or overtemperature protection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0063—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries with circuits adapted for supplying loads from the battery
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Abstract
The application relates to a protection circuit, a battery management system and a battery pack, wherein the protection circuit comprises a first switch unit, a fuse, a second switch unit and a main control unit; the first switch unit is connected between the battery pack and the load in series and used for switching on or off the connection between the battery pack and the load; the main control unit judges the failure state of the first switch unit and/or the battery pack and controls the conduction or the disconnection of the second switch unit according to the judgment result; when the protection circuit is triggered to protect, the fuse fuses to disconnect the load from the battery pack. In the scheme, after the first switch unit and/or the battery pack are/is failed, the connection between the battery pack and the load can be disconnected through the second switch unit, so that the purpose of protecting the battery pack and the load is achieved, and potential safety hazards are reduced.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a protection circuit, a battery management system and a battery pack.
Background
In recent years, with the rapid advance of new energy technology, the application of a Battery pack is increasing, and since the Battery pack is easily broken down due to overheating, overvoltage, external impact (such as accident) or other reasons, it is generally required to use a Battery Management System (BMS) to secure the safety of the Battery pack during use.
At present, when a fault occurs, a fuse and a switching device in a BMS circuit are generally adopted to timely disconnect charging and discharging of a battery pack so as to achieve the purpose of protecting the battery pack or a load. However, when the switching device in the BMS circuit fails, the on-resistance in the BMS circuit is uncertain, and when the on-resistance is high, the fuse cannot be fused, thereby causing damage to the battery pack or the load, which brings about a great safety hazard.
Disclosure of Invention
In view of the above problems, embodiments of the present application provide a protection circuit, a battery management system, and a battery pack, which are used to protect a battery pack or a load from being damaged and reduce potential safety hazards.
In a first aspect, the present application provides a protection circuit, including a first switch unit, a fuse, a second switch unit, and a main control unit; the first switch unit is connected between the battery pack and the load in series and used for switching on or off the connection between the battery pack and the load; and the main control unit is used for judging the failure state of the first switch unit and/or the battery pack and controlling the second switch unit to be switched on or switched off according to the judgment result.
When the protection circuit is triggered to protect, the fuse blows to disconnect the load from the battery pack.
In some embodiments, the protection circuit further comprises: and the switch state detection unit is connected with the main control unit and is used for detecting the state and/or the temperature of the first switch unit.
The failure state of the first switching unit includes: when the main control unit does not send a driving signal for conducting the first switch unit to the first switch unit, the first switch unit is conducted or is changed from off to on; or when the main control unit does not send a driving signal for disconnecting the first switch unit to the first switch unit, the first switch unit is disconnected or is changed from on to off; or when the main control unit does not send a driving signal to the first switch unit, the temperature of the first switch unit is higher than the ambient temperature.
In some embodiments, the protection circuit further comprises: and the current detection unit is connected with the main control unit and is used for detecting the first current of the protection circuit.
The failure state of the first switching unit includes: when the main control unit does not send a driving signal to the first switch unit, the absolute value of the first current is larger than the first threshold value or the first current is not zero.
In some embodiments, the protection circuit further comprises: and the voltage detection unit is connected with the main control unit and is used for detecting the voltages at two ends of the load.
Correspondingly, the failure state of the first switching unit includes: when the main control unit does not send a driving signal to the first switch unit, the absolute value of the voltage value is greater than the second threshold value.
In some embodiments, the protection circuit further comprises: the battery state detection unit is connected with the main control unit and is used for detecting the temperature value and/or the voltage value of the battery pack.
The failure states of the battery pack include: the temperature value of the battery pack is higher than a third threshold value; and/or the absolute value of the voltage value of the battery pack is higher than the fourth threshold.
In some embodiments, the main control unit is configured to obtain a failure duration of the first switch unit and/or the battery pack; and judging the relation between the failure time length and the first time length threshold value, and controlling the on-off of the second switch unit according to the judgment result.
In some embodiments, the fuse detection unit is connected with the main control unit and used for detecting the fusing state of the fuse; the main control unit is used for controlling the second switch unit to be switched on, acquiring the fusing state of the fuse, and controlling the first switch unit to be switched on or switched off according to the fusing state.
In some embodiments, the main control unit obtains a voltage difference between two ends of the fuse, and the fuse blows if the voltage difference is greater than a fifth threshold or the voltage difference is not zero.
In some embodiments, the master control unit is further configured to store the detection results received during the failure at the first switching unit and/or the battery pack.
In a second aspect, an embodiment of the present application further provides a battery management system, including the protection circuit according to the first aspect.
In a second aspect, an embodiment of the present application further provides a battery pack, which includes a battery pack and the battery management system of the second aspect, where the battery pack is used to supply power to the battery management system.
The application provides a protection circuit, a battery management system and a battery pack, wherein the protection circuit comprises a first switch unit, a fuse, a second switch unit and a main control unit; the first switch unit is connected between the battery pack and the load in series and used for switching on or off the connection between the battery pack and the load; the main control unit is used for judging the failure state of the first switch unit and/or the battery pack and controlling the second switch unit to be switched on or switched off according to the judgment result; when the protection circuit is triggered to protect, the fuse fuses to disconnect the load from the battery pack. In the scheme, after the first switch unit and/or the battery pack are/is failed, the connection between the battery pack and the load can be disconnected through the second switch unit, so that the purpose of protecting the battery pack and the load is achieved, and potential safety hazards are reduced.
It should be understood that what is described in the summary section above is not intended to limit key or critical features of the embodiments of the application, nor is it intended to limit the scope of the application. Other features of the present application will become apparent from the following description.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly described below.
Fig. 1 is a first schematic circuit diagram of a protection circuit according to an embodiment of the present disclosure;
fig. 2 is a second schematic circuit diagram of a protection circuit according to an embodiment of the present disclosure;
fig. 3 is a schematic circuit diagram of a protection circuit according to an embodiment of the present disclosure;
fig. 4 is a schematic circuit structure diagram of a protection circuit according to an embodiment of the present disclosure;
fig. 5 is a schematic circuit structure diagram of a protection circuit according to an embodiment of the present disclosure;
fig. 6 is a sixth schematic circuit structure diagram of a protection circuit according to an embodiment of the present application;
fig. 7 is a seventh schematic circuit structure diagram of the protection circuit according to the embodiment of the present application;
fig. 8 is a schematic structural diagram of a battery management system according to an embodiment of the present application;
fig. 9 is a schematic structural diagram of a battery pack according to an embodiment of the present application.
Description of reference numerals:
100. 501-a battery pack;
200. 401-a protection circuit;
300-load;
an FU-fuse;
s1 — a first switching unit;
s2 — a second switching unit;
201-a master control unit;
202-a switch state detection unit;
203-a current detection unit;
204-a voltage detection unit;
205-battery state detection unit;
206-a fuse detection unit;
400. 502-a battery management system;
500-battery pack.
With the above figures, there are shown specific embodiments of the present application, which will be described in more detail below. These drawings and written description are not intended to limit the scope of the inventive concepts in any manner, but rather to illustrate the inventive concepts to those skilled in the art by reference to specific embodiments.
Detailed Description
In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
In the context of embodiments of the present application, the term "comprising" and its various variants may be understood as open-ended terms, which mean "including but not limited to"; the term "based on" may be understood as "based at least in part on"; the term "one embodiment" may be understood as "at least one embodiment"; the term "another embodiment" may be understood as "at least one other embodiment". Other terms that may be present but are not mentioned herein should not be construed or limited in a manner that would contradict the concept upon which the embodiments of the present application are based unless explicitly stated.
In the description of the embodiments of the present application, it should be noted that the terms "connected," "communicating," and "connecting" are to be construed broadly, and may for example be fixed or connected through intervening media, may be communication between two elements, or may be interactive with two elements, unless expressly stated otherwise. Specific meanings of the above terms in the embodiments of the present application can be understood by those of ordinary skill in the art according to specific situations.
Based on the potential safety hazard problem that present BMS circuit exists, this application embodiment provides a protection circuit, battery management system and battery package, sets up controllable switch in protection circuit to when switching device or other devices became invalid, can realize the secondary protection of circuit through controllable switch, thereby reduce the potential safety hazard.
The following describes technical solutions of embodiments of the present application and how to solve the above technical problems with specific embodiments. The following several specific embodiments may be combined with each other, and details of the same or similar concepts or processes may not be repeated in some embodiments. Embodiments of the present application will be described below with reference to the accompanying drawings.
Fig. 1 is a first schematic circuit structure diagram of a protection circuit according to an embodiment of the present disclosure. As shown in fig. 1, the protection circuit 200 is connected between the battery pack 100 and the load 300 for protecting the battery pack 100 and the load 300. The protection circuit 200 includes: a first switch unit S1, a fuse FU, a second switch unit S2, and a main control unit 201.
Wherein the first switching unit S1 is connected in series between the battery pack 100 and the load 300, and the first switching unit S1 is used to turn on or off the connection between the battery pack 100 and the load 300. Wherein the battery pack 100 supplies power to the load when the first switching unit S1 is in an on state, and the battery pack 100 cuts off power to the load when the first switching unit S1 is in an off state.
In practical applications, the main control unit 201 is configured to determine a failure state of the first switch unit S1 and/or the battery pack 100, and control the second switch unit S2 to be turned on or off according to the determination result.
Specifically, when it is determined that the first switch unit S1 and/or the battery pack 100 is failed, the protection circuit 200 is triggered to protect and controls the second switch unit S2 to be turned on, so that the fuse FU is shorted between the positive electrode and the negative electrode of the battery pack 100, and at this time, the fuse FU is blown to disconnect the load 300 from the battery pack 100.
In some embodiments, the main control unit 201 may acquire the state information of the first switch unit S1 and/or the battery pack 100 in real time, so as to determine the failure state of the first switch unit S1 and/or the battery pack 100, and as for the acquisition method, the embodiment of the present application is not particularly limited. For example, in one aspect, the main control unit 20 may collect current state information of the first switching unit S1 and/or the battery pack 100 in real time by being electrically connected with the first switching unit S1 and/or the battery pack 100; on the other hand, the main control unit 20 may further be communicatively connected to the first switch unit S1 and/or the battery pack 100, so as to obtain the status information collected by the first switch unit S1 and/or the battery pack 100 in real time, and as for other collection manners, the following embodiments show these collection manners.
In practical applications, when the main control unit 201 determines that the first switch unit S1 and/or the battery pack 100 fails, the connection between the battery pack 100 and the load 300 needs to be disconnected, so as to implement secondary protection for the battery pack 100 and the load.
As shown in fig. 1, the fuses FU and S1 are connected in series between the battery pack 100 and the load 300, and when the second switch unit is closed S2, the fuse FU is shorted between the positive and negative electrodes of the battery pack 100, and a low-impedance short circuit is formed between the battery pack 100 and the fuse FU, so that the fuse FU is blown by the short circuit current of the low-impedance short circuit, thereby disconnecting the battery pack 100 from the load 300.
In other embodiments, when the fuse FU is connected to another location, the fuse FU can be shorted between the positive electrode and the negative electrode of the battery pack 100 by controlling the second switch unit S2 to be closed. For example, please refer to fig. 2.
Fig. 2 is a second schematic circuit structure diagram of the protection circuit according to the embodiment of the present application. As shown in fig. 2, the fuse FU and the first switch unit S1 are respectively connected to the load 300 through the positive and negative electrodes of the battery pack 100, and when the second switch unit is closed S2, the fuse FU is short-circuited between the positive and negative electrodes of the battery pack 100, and a low-impedance short circuit loop is formed between the battery pack 100 and the fuse FU, so that the fuse FU is fused by the short circuit current of the low-impedance short circuit loop, thereby achieving the disconnection between the battery pack 100 and the load 300.
It should be noted that, the embodiments of the present application are not particularly limited to specific types of the first switch unit S1 and the second switch unit S2, and for example, the first switch unit S1 and the second switch unit S2 may be metal-oxide semiconductor field effect transistors.
The application provides a protection circuit, including first switch unit, fuse, second switch unit and main control unit. After the first switch unit and/or the battery pack are/is failed, the battery pack can be disconnected from the load through the second switch unit, so that the purpose of protecting the battery pack and the load is achieved, and potential safety hazards are reduced.
In some embodiments, since the second switch unit S2 is only briefly closed when the device fails, a switch with a lower rated parameter may be selected, thereby saving device cost and reducing volume.
In addition, in the embodiment of the present application, the second switch unit S2 is connected in parallel in the charge/discharge circuit, and the second switch unit S2 is in the off state during normal operation, so that additional heat generation is not generated, and the safety of the system can be further improved.
In practical applications, the inventor found that when external interference occurs in the circuit, the main control unit 201 is easily misjudged due to the external interference, so that the battery pack 100 and the load 300 are mistakenly cut off in the case that the first switch unit S1 or the battery pack 100 does not fail or temporarily fails, and thus the power supply to the load 300 is mistakenly cut off, resulting in economic loss.
Therefore, when the main control unit 201 closes the second switch unit S2, it is also necessary to determine whether the first switch unit S1 and/or the battery pack 100 really fail again, thereby preventing erroneous determination due to external interference. Specifically, the timing may be started when the main control unit 201 determines that the first switch unit S1 and/or the battery pack 100 is failed, and the time length of the failure of the first switch unit and/or the battery pack may be determined.
Further, if it is determined that the first switch unit S1 and/or the battery pack 100 fails for a period of time greater than or equal to the time threshold, the second switch unit S2 is controlled to close; if it is determined that the time period during which the first switching unit S1 and/or the battery pack 100 is failed is less than the time period threshold, it is determined that the determination is a false determination due to external interference, and the second switching unit S2 needs to be continuously maintained in the off state.
It should be noted that the size of the duration threshold may be set according to the sensitivity requirement or the actual requirement of the protection circuit, and may be, for example, 1 second, 3 seconds, and the like.
In the embodiment of the present application, the failure state of the first switching unit S1 and/or the battery pack 100 can be more accurately determined, thereby preventing an erroneous operation caused by external interference and reducing economic loss. In addition, the time length threshold corresponding to the failure time length can be set in a user-defined mode according to the sensitivity requirement, so that the circuit can be flexibly suitable for various circuit systems.
In some embodiments, upon failure of the first switch unit S1 and/or the battery pack 100, the master control unit 201 may also continue to obtain the detection results during the failure, thereby providing raw data for subsequent maintenance analysis.
In practical applications, the failure condition of the first switch unit S1 can be detected through various detection methods, which will be described below with reference to the specific embodiments shown in fig. 3, fig. 4 and fig. 5.
Fig. 3 is a third schematic circuit structure diagram of the protection circuit according to the embodiment of the present application. As shown in fig. 3, the protection circuit 200 further includes: a switch state detection unit 202.
The switch state detection unit 202 is connected to the main control unit 201, and the switch state detection unit 202 is configured to detect a state and/or a temperature of the first switch unit S1.
Alternatively, the switch state detection unit 202 may send the detection result to the main control unit 201.
Specifically, the switch state detection unit 202 detects the conducting state of the first switch unit S1 in real time and sends the detection result to the main control unit 201, and/or the switch state detection unit 202 detects the temperature of the first switch unit S1 in real time and sends the detection result to the main control unit 201.
Correspondingly, the main control unit 201, after receiving the detection result of the switch state detection unit 202, determines that the first switch unit S1 is disabled when any of the following occurs:
(1) when the main control unit 201 does not send a driving signal for turning on the first switch unit S1 to the first switch unit S1, the first switch unit S1 is in a conducting state, or the first switch unit S1 is switched from a disconnected state to a conducting state;
(2) when the main control unit 201 does not send a driving signal for turning off the first switch unit S1 to the first switch unit S1, the first switch unit S1 is in an off state, or the first switch unit S1 is switched from an on state to an off state;
(3) when the main control unit does not send a driving signal to the first switch unit, the temperature of the first switch unit is higher than the ambient temperature.
In the embodiment of the application, the state of the first switch unit S1 is detected by the switch state detection unit, and then the main control unit determines the failure state of the first switch unit S1 according to the detection result, so that the accuracy of the detection result of the failure state can be improved, and the potential safety hazard of the circuit is further reduced.
Fig. 4 is a fourth schematic circuit structure diagram of the protection circuit according to the embodiment of the present application. As shown in fig. 4, the protection circuit 200 further includes: the current detection unit 203, the current detection unit 203 is connected to the main control unit 201, and is configured to detect a first current of the protection circuit 200.
Optionally, the current detection unit 203 is further configured to send the detected first current to the main control unit 201.
Correspondingly, the master control unit 201 determines that the first switch unit S1 is disabled when: the main control unit 201 does not send a driving signal to the first switch unit S1, but detects that the first current is greater than a first threshold, or detects that a current exists in the protection circuit, where the size of the first threshold is not specifically limited in the embodiment of the present application.
In some embodiments, the failure state of the first switching unit S1 may also be judged by the detection voltage. Specifically, please refer to fig. 5, in which fig. 5 is a fifth schematic circuit diagram of the protection circuit according to the embodiment of the present disclosure. As shown in fig. 5, the protection circuit 200 further includes: the voltage detection unit 204, the voltage detection unit 204 is connected to the main control unit 201, and is configured to detect a voltage value across the load 300.
Optionally, the voltage detection unit 204 is further configured to send the detected voltage value to the main control unit 201.
Correspondingly, the master control unit 201 determines that the first switch unit S1 is disabled in the following case: when the main control unit 201 does not send the driving signal to the first switching unit S1, the absolute value of the detected voltage value is greater than the second threshold value.
It should be noted that, in practical applications, only any one or more of the switch state detection unit 202, the current detection unit 203 and the voltage detection unit may be included in the protection circuit 200, so as to improve the accuracy of the detection result of the failure state of the first switch unit S1 while meeting the requirements of more scenarios.
In practical applications, the failure of the battery pack 100 can be detected by various detection methods, which will be described with reference to the specific embodiment shown in fig. 6.
Fig. 6 is a schematic circuit structure diagram of a protection circuit according to an embodiment of the present application. It should be understood that the protection circuit 200 shown in fig. 6 includes the switch state detection unit 202 and the current detection unit 203 as an example, but the present invention is not limited thereto in practical applications. As shown in fig. 6, the protection circuit 200 further includes:
a battery state detection unit 205, wherein the battery state detection unit 205 is connected to the main control unit 201, and the battery pack detection unit 205 may be a temperature detection unit or a voltage detection unit, and is configured to detect a temperature value and/or a voltage value of the battery pack 100.
Optionally, the battery pack detection unit 205 is further configured to send the detection result to the main control unit 201.
Correspondingly, the main control unit 201 determines that the battery pack 100 is failed in the following case:
the temperature value of the battery pack 100 is higher than the third threshold value; and/or the absolute value of the voltage value of the battery pack 100 is higher than the fourth threshold. It should be understood that, for specific values of the third threshold and the fourth threshold, the embodiments of the present application are not particularly limited, and for example, the values may be temperature values and voltage values when the battery pack 100 is normally operated.
In practical applications, the inventors also found that, after the second switch unit S2 is closed, if the impedance of the short circuit loop formed between the battery pack 100 and the fuse is low, the fuse FU may not be blown.
In order to solve the above problem, it is further necessary to detect the current blown state of fuse FU after second switch unit S2 is closed, so as to perform further processing according to the blown state of fuse FU, and the following detailed description is made with reference to fig. 7:
fig. 7 is a schematic circuit structure diagram of a protection circuit according to an embodiment of the present application. As shown in fig. 7, the protection circuit provided in the embodiment of the present application may further include: and a fuse detection unit 206, wherein the fuse detection unit 206 is connected to the main control unit 201 and is configured to detect a fuse state of the fuse FU.
Optionally, the disconnection detecting unit 206 is further configured to send the detection result to the main control unit 201.
Specifically, when detecting the blown state of fuse FU, blowing detection unit 206 is specifically configured to: determining the voltage difference across fuse FU; if the voltage difference is greater than the fifth threshold value or the voltage difference is not zero, determining that the fuse FU is in a fusing state; if the voltage difference is less than or equal to the fifth threshold, fuse FU is determined to be in an un-blown state.
In some embodiments, the fuse detection unit 206 may be further configured to detect a voltage value at two ends of the fuse FU and send the voltage value to the main control unit 201, and the main control unit 201 determines whether the fuse FU is fused according to the voltage value, where a specific determination logic is similar to a determination logic of the fuse detection unit 206, and is not described herein again. It should be understood that, regarding the size of the fifth threshold, the embodiment of the present application is not particularly limited, and for example, the fifth threshold may be a voltage difference between two ends of the fuse FU when the fuse FU is not blown.
Accordingly, on the one hand, after controlling the second switch unit S2 to be closed, if it is determined that the fuse FU is in the blown state, the main control unit 201 sends a prompt message, where the prompt message is used to prompt the user that the fuse is in the blown state.
Specifically, after the fusing state is obtained, the control record of the main control unit 201 is obtained, that is, if the current main control unit 201 has controlled the second switch unit S2 to be closed, it indicates that the protection mechanism of the protection circuit 200 is completed, and a prompt message needs to be sent to remind a worker to replace the fuse or repair the circuit system in time. It should be understood that, for the prompt manner, the embodiment of the present application is not specifically limited, for example, one or more of an audible and visual prompt, a display screen prompt, an app prompt, and the like may be used, and details are not repeated here.
Alternatively, if fuse FU is determined to be in an unblown state, first switch unit S1 is controlled to be turned off. Specifically, after the blown state is obtained, the control record of the main control unit 201 is obtained, that is, if the current main control unit 201 has controlled the second switch unit S2 to be closed and the fuse is not blown, at this time, the first switch unit S1 needs to be controlled to be opened, so as to prevent the battery pack 100 from being continuously short-circuited with the fuse FU, thereby protecting the battery pack 100. Meanwhile, after the first switching unit S1 is turned off, the connection between the battery pack 100 and the load 300 may be disconnected, and the load and the battery pack may be protected, thereby reducing potential safety hazards.
An embodiment of the present application further provides a battery management system, and fig. 8 is a schematic structural diagram of the battery management system provided in the embodiment of the present application. As shown in fig. 8, the battery management circuit 400 provided in the embodiment of the present application includes a protection circuit 401.
It can be understood that the protection circuit 401 in the protection system provided in the embodiment of the present application has a similar implementation structure, principle and technical effect to those of the embodiment corresponding to the protection circuit described above, and is not described herein again.
The embodiment of the present application further provides a battery pack, and fig. 9 is a schematic structural diagram of the battery pack provided in the embodiment of the present application. As shown in fig. 9, a battery pack 500 provided in the embodiment of the present application includes a battery pack 501 and a battery management system 502, where the battery pack 501 is connected to the battery management system 502, and the battery pack 501 is used to supply power to the battery management system 502.
It can be understood that the battery management system 502 in the protection system provided in the embodiment of the present application has similar implementation structure, principle and technical effect to those of the embodiment corresponding to the battery management system described above, and is not described herein again.
It should be noted that, the structures of the protection circuit, the battery management system, and the battery pack provided in the embodiments of the present application do not limit the embodiments of the present application, and in practical applications, more or fewer components than those shown in the drawings may be included, or some components may be combined, or different component arrangements may be included, which are not described in detail herein.
Finally, it should be noted that: the above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present application.
Claims (11)
1. A protection circuit is characterized by comprising a first switch unit, a fuse, a second switch unit and a main control unit;
the first switch unit is connected between a battery pack and a load in series and is used for switching on or off the connection between the battery pack and the load;
the main control unit is used for judging the failure state of the first switch unit and/or the battery pack and controlling the second switch unit to be switched on or switched off according to the judgment result;
when the protection circuit is triggered to protect, the fuse blows to disconnect the load from the battery pack.
2. The protection circuit of claim 1, further comprising: the switch state detection unit is connected with the main control unit and is used for detecting the state and/or the temperature of the first switch unit;
the failure state of the first switching unit includes:
when the main control unit does not send a driving signal for conducting the first switch unit to the first switch unit, the first switch unit is conducted or is changed from off to on; or the like, or, alternatively,
when the main control unit does not send a driving signal for disconnecting the first switch unit to the first switch unit, the first switch unit is disconnected or is changed from on to off; or the like, or, alternatively,
when the main control unit does not send the driving signal to the first switch unit, the temperature of the first switch unit is higher than the ambient temperature.
3. The protection circuit of claim 1, further comprising: the current detection unit is connected with the main control unit and is used for detecting a first current of the protection circuit;
the failure state of the first switching unit includes:
when the main control unit does not send a driving signal to the first switch unit, the absolute value of the first current is greater than a first threshold value or the first current is not zero.
4. The protection circuit of claim 1, further comprising: the voltage detection unit is connected with the main control unit and is used for detecting voltage values at two ends of the load;
the failure state of the first switching unit includes:
when the main control unit does not send a driving signal to the first switch unit, the absolute value of the voltage value is larger than a second threshold value.
5. The protection circuit according to any one of claims 1 to 4, characterized in that the protection circuit further comprises: the battery state detection unit is connected with the main control unit and is used for detecting a temperature value and/or a voltage value of the battery pack;
the failure state of the battery pack includes:
the temperature value of the battery pack is higher than a third threshold value;
and/or the absolute value of the voltage value of the battery pack is higher than a fourth threshold value.
6. The protection circuit according to any one of claims 1 to 4, wherein the main control unit is configured to obtain a failure duration of the first switch unit and/or the battery pack;
and judging the relation between the failure time length and a first time length threshold value, and controlling the second switch unit to be switched on or switched off according to the judgment result.
7. The protection circuit according to any one of claims 1 to 4, characterized in that the protection circuit further comprises: the fusing detection unit is connected with the main control unit and is used for detecting the fusing state of the fuse protector;
the main control unit controls the second switch unit to be switched on, obtains the fusing state of the fuse, and controls the first switch unit to be switched on or switched off according to the fusing state.
8. The protection circuit according to claim 7, wherein the main control unit obtains a voltage difference between two ends of the fuse, and the fuse is blown if the voltage difference is greater than a fifth threshold value or the voltage difference is not zero.
9. The protection circuit according to any one of claims 1 to 4, wherein the main control unit is further configured to store a detection result received during a failure of the first switching unit and/or the battery pack.
10. A battery management system comprising the protection circuit according to any one of claims 1 to 9.
11. A battery pack comprising a battery pack and the battery management system of claim 10, the battery pack being for powering the battery management system.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110794033.8A CN113489104A (en) | 2021-07-14 | 2021-07-14 | Protection circuit, battery management system and battery pack |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110794033.8A CN113489104A (en) | 2021-07-14 | 2021-07-14 | Protection circuit, battery management system and battery pack |
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| CN113489104A true CN113489104A (en) | 2021-10-08 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113949126A (en) * | 2021-10-14 | 2022-01-18 | 东莞新能安科技有限公司 | Charging protection circuit, battery management system, battery pack and circuit control method |
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2021
- 2021-07-14 CN CN202110794033.8A patent/CN113489104A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113949126A (en) * | 2021-10-14 | 2022-01-18 | 东莞新能安科技有限公司 | Charging protection circuit, battery management system, battery pack and circuit control method |
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