CN114709885A - Battery protection method, protection device of battery management system, chip and equipment - Google Patents
Battery protection method, protection device of battery management system, chip and equipment Download PDFInfo
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- CN114709885A CN114709885A CN202210291523.0A CN202210291523A CN114709885A CN 114709885 A CN114709885 A CN 114709885A CN 202210291523 A CN202210291523 A CN 202210291523A CN 114709885 A CN114709885 A CN 114709885A
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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
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/18—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions for batteries; for accumulators
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Abstract
The application discloses a battery protection method, a protection device of a battery management system, a chip and battery power supply equipment. The method comprises the following steps: sampling an electrical signal of the battery; judging whether a secondary protection mechanism is triggered or not according to the electric signal, if so, judging whether the state of the battery is the first power-on state or the electric signal is abnormal or not; if the battery is in a state of being electrified for the first time or the electric signal is abnormal, delaying a preset time period; and after the delay of the preset time period is ended, sampling the battery again, and starting a secondary protection function if the condition of triggering a secondary protection mechanism is met. According to the technical scheme, false triggering of a secondary protection mechanism of the battery management system can be avoided, the working efficiency of electronic products is improved, and the cost is saved.
Description
Technical Field
The present invention relates to the field of electronic circuit technologies, and in particular, to a battery protection method, a protection device of a battery management system, a chip, and a battery-powered device.
Background
The battery can provide endurance for various electronic products. Generally, a battery in an electronic product is operated by combining a plurality of battery cells. Each Battery cell may be managed by a Battery Management System (BMS). Part of battery management systems with higher safety requirements are provided with a secondary protection mechanism to prevent the battery from being overcharged or overdischarged seriously. By secondary protection mechanism is meant the functionality of secondary protection provided to the battery in the event of failure of the primary protection.
However, in the research of the inventor of the present application, it is found that in the existing battery management system, the accuracy of triggering of the secondary protection mechanism is low, and the secondary protection mechanism is frequently triggered by mistake, so that the working efficiency of the electronic product is affected, and the cost is increased due to the irreversible characteristic of the secondary protection.
Disclosure of Invention
The embodiment of the application provides a battery protection method, a protection device of a battery management system, a chip and a battery power supply device, which can avoid false triggering of a secondary protection mechanism of the battery management system and improve the working efficiency of an electronic product.
In one aspect, the present application provides a battery management method, including:
sampling an electrical signal of the battery;
judging whether a secondary protection mechanism is triggered or not according to the electric signal, and if so, judging whether the state of the battery is the first power-on state or the electric signal is abnormal or not;
if the battery is in a state of being electrified for the first time or the electric signal is abnormal, delaying a preset time period;
and after the delay of the preset time period is ended, sampling the battery again, and starting a secondary protection function if the condition of triggering a secondary protection mechanism is met.
With reference to the first aspect, in one possible implementation manner, the method further includes:
stopping sampling the battery within the time of delaying the preset time period, sampling the battery again after the delay of the preset time period is ended, and starting a secondary protection function if the condition of triggering a secondary protection mechanism is met; or
And continuously sampling the battery within the time of delaying the preset time period until the delay of the preset time period is terminated, and starting a secondary protection function if the condition of triggering a secondary protection mechanism is met.
With reference to the first aspect, in one possible implementation manner, the sampling an electrical signal of a battery includes:
the method comprises the steps that pins at the front end of an analog circuit are connected with two ends of a plurality of battery units connected in series in a battery through a flat cable, and electric signals for sampling the battery units are obtained by detecting the flat cable;
the judging whether the state of the battery is first power-on or abnormal electric signals comprises the following steps:
and judging whether a suspension signal appears in the flat cable, if so, judging that the state of the battery is the first electrification or the electrical signal abnormity.
In a second aspect, the present application provides a protection device for a battery management system, comprising:
a detection unit for sampling the electric signal of the battery;
a processing unit for judging whether to trigger a secondary protection mechanism and whether the state of the battery is the first power-on or the electrical signal is abnormal according to the electrical signal;
the delay unit triggers delay when a secondary protection mechanism is triggered and the battery is electrified for the first time or an electric signal is abnormal; and
and after the delay of the preset time period is ended, sampling the battery again, and starting the electrifying control unit with the secondary protection function under the control of the processing unit when the condition that a secondary protection mechanism is triggered is met.
With reference to the second aspect, in a possible implementation manner, the processing unit controls the detecting unit to stop sampling the battery within a time period after the delay of the preset time period is delayed, samples the battery again after the delay of the preset time period is terminated, and controls the power-on control unit to start a secondary protection function if a condition for triggering a secondary protection mechanism is met; or alternatively
And the processing unit controls the detection unit to continuously sample the battery within the time of delaying the preset time period until the delay of the preset time period is terminated, and controls the electrifying control unit to start a secondary protection function if the condition of triggering a secondary protection mechanism is met.
With reference to the second aspect, in a possible implementation manner, the detection unit specifically includes an analog front end, a pin of the analog front end is connected to two ends of a plurality of battery units connected in series in the battery through a flat cable, and the flat cable is detected to obtain electrical signals of the plurality of battery units;
the processing unit is an MCU;
the delay unit is a delay circuit which is internally or externally arranged on the MCU;
the power-on control unit includes a switching circuit connected between the battery and a load;
and the MCU determines the state of the battery as the first power-on or the electrical signal abnormity according to whether the suspension signal appears in the flat cable, and if the suspension signal appears, the state of the battery is the first power-on or the electrical signal abnormity.
In a third aspect, the present application provides a protection chip of a battery management system, including:
a detection circuit for sampling an electrical signal of the battery;
a processor for judging whether to trigger a secondary protection mechanism and whether the state of the battery is the first power-on or the electrical signal is abnormal according to the electrical signal;
a delay circuit for triggering a secondary protection mechanism and triggering delay when the battery is powered on for the first time or the electric signal is abnormal; and
and after the delay of the preset time period is ended, sampling the battery again, and starting the electrifying control circuit with the secondary protection function under the control of the processor when the condition that a secondary protection mechanism is triggered is met.
With reference to the third aspect, in a possible implementation manner, the processor controls the detection circuit to stop sampling the battery within a time period after the delay of the preset time period is delayed, samples the battery again after the delay of the preset time period is terminated, and controls the power-on control circuit to start a secondary protection function if a condition for triggering a secondary protection mechanism is met; or alternatively
And the processor controls the detection circuit to continuously sample the battery within the time of delaying the preset time period until the delay of the preset time period is terminated, and controls the electrifying control circuit to start a secondary protection function if the condition of triggering a secondary protection mechanism is met.
With reference to the third aspect, in a possible implementation manner, the detection circuit specifically includes an analog front end, a pin of the analog front end is connected to two ends of a plurality of battery units connected in series in the battery through a flat cable, and the flat cable is detected to obtain electrical signals of the plurality of battery units;
the processor is an MCU;
the delay circuit is a delay circuit which is internally or externally arranged on the MCU;
the power-on control circuit comprises a switch circuit connected between the battery and a load;
and the MCU determines the state of the battery as the first power-on or the electrical signal abnormity according to whether the suspension signal appears in the flat cable, and if the suspension signal appears, the state of the battery is the first power-on or the electrical signal abnormity.
In a fourth aspect, the present application provides a battery powered device, including a battery, an analog front end, an MCU, a delay circuit, and a power-on control circuit;
the battery comprises a plurality of battery units connected in series;
the pins at the analog front end are connected with two ends of a plurality of battery units connected in series in the battery through a flat cable, and electric signals for sampling the battery units are obtained by detecting the flat cable;
the analog front end is connected with the MCU;
the MCU is connected with the delay circuit;
the MCU is connected with the power-on control circuit, and the power-on control circuit is connected between the battery and the load.
The application provides a battery protection method, a protection device of a battery management system, a chip and a battery power supply device, a battery is sampled, an electric signal of the battery is obtained, whether a secondary protection mechanism is triggered is judged according to the electric signal, whether the state of the battery is the first electrification or the abnormal electric signal is further judged when the condition of the secondary protection mechanism is determined to be met, delay is carried out under the condition that the condition is determined to be yes, the electric signal of the battery is obtained again after delay, if the condition of triggering the secondary protection mechanism is still met, a secondary protection function is started, compared with the prior art, false triggering of the secondary protection mechanism of the battery management system can be avoided, the working efficiency of an electronic product is improved, and the cost is saved.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art to obtain other drawings based on these drawings without inventive labor.
Fig. 1 is a schematic structural diagram of a protection device of a battery management system in an embodiment of the present application;
fig. 2a is a schematic structural diagram of a protection device of a battery management system according to an embodiment of the present application;
fig. 2b is a schematic structural diagram of a protection device of a battery management system according to another embodiment of the present application;
fig. 3 is a schematic structural diagram of a battery and a detection unit provided in an embodiment of the present application;
fig. 4 is a schematic structural diagram of a protection chip of a battery management system according to an embodiment of the present disclosure;
fig. 5 is a schematic flow chart of a battery protection method according to an embodiment of the present disclosure;
fig. 6 is a schematic structural diagram of a battery-powered device according to an embodiment of the present application.
Detailed Description
For better understanding of the technical solutions of the present invention, the following detailed descriptions of the embodiments of the present invention are provided with reference to the accompanying drawings.
It should be understood that the described embodiments are only some embodiments of the invention, and not all 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 invention.
The terminology used in the embodiments of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used in the examples of the present invention and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should be understood that the term "and/or" as used herein is merely one type of association that describes an associated object, meaning that three relationships may exist, e.g., a and/or B may mean: a exists alone, A and B exist simultaneously, and B exists alone. In addition, the character "/" herein generally indicates that the former and latter related objects are in an "or" relationship.
Referring to fig. 1, a protection device of a battery management system is provided in an embodiment of the present application. The protection device of the battery management system in the embodiment of the application can avoid the false triggering of a secondary protection mechanism of the battery management system, and improve the working efficiency of electronic products.
In an embodiment of the present application, the protection device of a battery management system includes:
a detection unit 101 for sampling the battery 100 and acquiring an electric signal of the battery 100;
the processing unit 102 determines whether to trigger a secondary protection mechanism and whether the state of the battery 100 is the first power-on state or the abnormal state of the electrical signal according to the electrical signal;
a delay unit 103 for triggering a delay when a secondary protection mechanism is triggered and the battery 100 is first powered on or an electrical signal is abnormal; and
after the delay of the preset time period is terminated, the battery 100 is sampled again, and if the condition for triggering the secondary protection mechanism is met, the power-on control unit 104 of the secondary protection function is started under the control of the processing unit 102.
The protection device of the battery management system provided by the embodiment of the application samples the battery, acquire the electric signal of the battery, judge whether to trigger the secondary protection mechanism according to the electric signal, when the condition that the secondary protection mechanism is met is determined, further judge whether the state of the battery is the first power-on or the electric signal is abnormal, if the condition is determined to be yes, delay is performed, acquire the electric signal of the battery again after delay, if the condition that the secondary protection mechanism is triggered is still met, the secondary protection function is started.
The above-described apparatus is described below in the more detailed examples provided in this application.
The protection device of the battery management system comprises a detection unit 101, a processing unit 102, a delay unit 103 and an electrifying control unit 104.
The detection unit 101 may be, but not limited to, an Analog Front End (AFE), and may collect an electrical signal of the battery, where the electrical signal may include a voltage signal, a current signal, an overvoltage signal, an overcurrent signal, and a temperature signal. As illustrated in fig. 3, the battery may be formed by connecting a plurality of battery units (battery cells) in series, or may be formed by connecting a plurality of battery cells in parallel first and then connecting the plurality of battery cells in series. The simulation front end is connected with two ends of a plurality of battery units connected in series through a flat cable led out by a detection pin so as to detect each battery unit.
The processing unit 102 may be a processor or a control chip with control function, such as a CPU, an MCU, etc., and may perform further processing according to the electrical signal of the battery detected by the analog front end.
Specifically, the processing unit 102 further determines whether the state of the battery is first powered on or the electrical signal is abnormal when determining that the condition for triggering the secondary protection mechanism is met according to the electrical signal of the battery acquired by the detecting unit 101.
The processing unit 102 may determine whether the battery is powered on for the first time according to the voltage abnormality signal represented by the wiring sequence of the flat cable. Taking fig. 3 as an example, for example, when the battery pack is first assembled into an electronic product, when the wiring of VC6, VC5, VC4, and VC3 is completed, no wiring is performed corresponding to VC2 and VC1, and it is set that the voltage signal collected by the analog front end is "1" and no voltage signal collected by the analog front end is "0", at this time, the electric signal which is initially powered on and collected by the processing unit 102 from the analog front end is "1111000", for example, when the wiring of VC0, VC1, and VC2 is completed, the electric signal which is initially powered on and collected by the analog front end and corresponds to VC3, VC4, VC5, and VC6 is not wired, and it is set that the voltage signal collected by the analog front end is "1" and no voltage signal collected by the analog front end is "0", at this time, the electric signal which is initially powered on and collected by the processing unit 102 from the analog front end is "0001111". That is, in the embodiment of the present application, by determining whether a floating signal occurs in the flat cable, if the floating signal occurs, the state of the battery is the first power-on state. Of course, in the embodiment of the application, by judging whether the suspension signal appears in the flat cable, whether the battery is loosened or not can be detected for the first time, and whether the flat cable is loosened or not can also be detected in the subsequent working process of the battery. In practice, the first power-on of the battery or the loose of the flat cable in the use process can generate abnormal signals to cause the false triggering of the secondary protection mechanism.
After the processing unit 102 determines that the condition for triggering the secondary protection mechanism is currently satisfied and the state of the battery 100 is the first power-on or loose cable, the processing unit 102 may trigger the delay unit 103 to operate.
The delay unit 103 may be a device built in the processing unit 102 or a device external to the processing unit 102. The delay unit 103 may be, for example, a timer, a delay circuit, or the like.
The arrangement form of the delay unit 103 has two kinds.
First, referring to fig. 2a, specifically, the processing unit 102 controls the detecting unit 101 to stop sampling the battery 100 within a time period that the preset time period is delayed until the delay of the preset time period is terminated, and obtains an electrical signal for sampling the battery 100 again, and if a condition that a secondary protection mechanism is triggered is met, controls the energization controlling unit 104 to start a secondary protection function.
Referring to fig. 2b, in a second setting, specifically, the processing unit 102 controls the detecting unit 101 to continuously sample the battery 100 within the time of delaying the preset time period until the delay of the preset time period is terminated, and controls the energization controlling unit 104 to start the secondary protection function if a condition for triggering the secondary protection mechanism is met. The arrangement form of the delay circuit can continuously sample the electric signal of the battery, thereby improving the sampling accuracy.
In the present embodiment, the energization control unit 104 is connected between the battery 100 and the load 200. The power-on control unit 104 may include a switching circuit. The switching circuit may be, but is not limited to, a MOS transistor or the like. In the embodiment of the application, when the detection unit 101 detects that the electrical signal satisfies the secondary protection condition and continues for the set delay time, the processing unit 102 outputs a driving voltage to turn on the MOS transistor connected to the heater end of the automatic control fuse, the two ends of the heater of the automatic control fuse generate heat due to the pressure difference, and the automatic control fuse fuses when the heat is accumulated to a certain degree, so as to cut off the battery and the load power supply loop, thereby realizing the secondary protection function of the battery.
Referring to fig. 4, in an embodiment of the present application, a protection chip of a battery management system is also provided.
Specifically, the protection chip 300 in the embodiment of the present application includes:
a detection circuit 301 for sampling the battery and obtaining the electric signal of the battery;
a processor 302 for judging whether to trigger a secondary protection mechanism and whether the battery is powered on for the first time or the electric signal is abnormal according to the electric signal;
a delay circuit 303 for triggering a delay when a secondary protection mechanism is triggered and the battery is powered on for the first time or an electric signal is abnormal; and
after the delay of the preset time period is terminated, the battery is sampled again, and if the condition for triggering the secondary protection mechanism is met, the power-on control circuit 304 of the secondary protection function is started under the control of the processor 302.
In an embodiment of the present application, the detection circuit 301 specifically includes an analog front end, a pin of the analog front end is connected to two ends of a plurality of battery units connected in series in the battery through a flat cable, and an electrical signal for sampling the plurality of battery units is obtained through the flat cable; the processor 302 may be an MCU; the delay circuit 303 may be a delay circuit built in or externally arranged to the MCU; the power-on control circuit 304 includes a switching circuit connected between the battery and the load.
In the embodiment of the application, the MCU determines the state of the battery as first power-on or abnormal electrical signal according to whether a suspension signal appears in the flat cable. Specifically, if a suspension signal occurs, the state of the battery is first power-on or an electrical signal is abnormal.
In an embodiment of the present application, the processor 302 may control the detection circuit 301 to stop sampling the battery within the time of delaying the preset time period, until the delay of the preset time period is terminated, obtain an electrical signal for sampling the battery again, and if a condition for triggering a secondary protection mechanism is met, control the power-on control circuit 304 to start a secondary protection function; or the processor 302 may control the detection circuit 301 to continuously sample the battery within the time of delaying the preset time period, until the delay of the preset time period is terminated, and if a condition for triggering a secondary protection mechanism is met, control the power-on control circuit 304 to start a secondary protection function.
The protection chip of the battery management system provided by the embodiment of the application samples the battery to obtain the power-on signal of the battery to the load, judges whether to trigger the secondary protection mechanism according to the power-on signal, further judges whether the state of the battery is the first power-on or abnormal electric signal when the condition of the secondary protection mechanism is determined to be met, delays if the condition is determined to be yes, obtains the electric signal of the battery again after delaying, and starts the secondary protection function if the condition of triggering the secondary protection mechanism is still met.
In another aspect of the embodiments of the present application, there is also provided a battery protection method, including:
sampling the battery to obtain an electric signal of the battery;
judging whether a secondary protection mechanism is triggered or not according to the electric signal, and if so, judging whether the state of the battery is the first power-on state or the electric signal is abnormal or not;
if the state of the battery is first power-on or the electric signal is abnormal, delaying a preset time period;
and after the delay of the preset time period is ended, sampling the battery again, and starting a secondary protection function if the condition of triggering a secondary protection mechanism is met.
The battery protection method provided by the embodiment of the application samples the battery, obtains the power-on signal of the battery to the load, judges whether to trigger the secondary protection mechanism according to the power-on signal, further judges whether the state of the battery is the first power-on or the abnormal electric signal when the condition of the secondary protection mechanism is determined to be met, delays the power-on or the abnormal electric signal if the condition of the secondary protection mechanism is determined to be met, obtains the electric signal of the battery again after delaying the delay, and starts the secondary protection function if the condition of the secondary protection mechanism is still met.
Fig. 5 is a more detailed embodiment of a battery protection method of the present application.
In the embodiment of fig. 5, the battery protection method includes:
the battery system power up begins 400.
401, according to the collected electrical signal of the battery, it is determined whether a condition for triggering a secondary protection mechanism is reached.
In case the decision is yes, 402 is further performed, otherwise 407 is performed.
It is further determined whether the state of the battery is first powered up 402.
If so, 403 is performed, otherwise 406 is performed.
And 403, delaying before performing secondary protection action.
And 404, judging whether the preset delay time is reached.
If so, 405 is performed, otherwise 403 is returned.
The electrical signal of the battery is collected again 405, and it is determined that the conditions for triggering the secondary protection mechanism are all satisfied.
If yes, 406 is performed, otherwise 407 is performed.
406, the actions of the secondary protection mechanism are performed.
407, the secondary protection mechanism judges that the process is finished.
In another aspect of the embodiments of the present application, a battery-powered device is also provided.
As shown in fig. 6, the battery-powered device shown includes: battery 500, analog front end 501, MCU502, delay circuit 503, and power-on control circuit 504.
Specifically, the battery 500 includes a plurality of battery cells connected in series; the flat cable of the analog front end 501 is connected with two ends of a plurality of battery units connected in series in the battery, and electric signals for sampling the plurality of battery units are obtained through the flat cable; the analog front end 501 is connected with the MCU 502; the MCU502 is connected with the delay circuit 503; the MCU502 is connected to the power-on control circuit 504, and the power-on control circuit 504 is connected between the battery 500 and a load.
The analog front end 501 may sample the battery and obtain a power-on signal of the battery to the load.
The MCU502 judges whether a secondary protection mechanism is triggered according to the power-on signal, and if so, judges whether the state of the battery 500 is the first power-on or the electrical signal is abnormal; when the battery is powered on for the first time or the electrical signal is abnormal, the delay circuit 503 is triggered to operate, and a preset time period is delayed.
After the delay of the preset time period is terminated, the MCU502 controls the analog front end 501 to sample the battery 500 again, and controls the power-on control circuit 504 to start the secondary protection function if the conditions for triggering the secondary protection mechanism are met.
The battery power supply equipment can avoid false triggering of a secondary battery protection mechanism caused by reasons such as first electrification of a battery or looseness of a flat cable, improve the working efficiency of an electronic product and save the cost of circuit damage caused by false triggering of secondary protection.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (10)
1. A method of protecting a battery, the method comprising:
sampling an electrical signal of the battery;
judging whether a secondary protection mechanism is triggered or not according to the electric signal, if so, judging whether the state of the battery is the first power-on state or the electric signal is abnormal or not;
if the battery is in a state of being electrified for the first time or the electric signal is abnormal, delaying a preset time period;
and after the delay of the preset time period is ended, sampling the battery again, and starting a secondary protection function if the condition of triggering a secondary protection mechanism is met.
2. The battery protection method of claim 1, further comprising:
stopping sampling the battery within the time of delaying the preset time period, sampling the battery again after the delay of the preset time period is ended, and starting a secondary protection function if the condition of triggering a secondary protection mechanism is met; or
And continuously sampling the battery within the time of delaying the preset time period until the delay of the preset time period is terminated, and starting a secondary protection function if the condition of triggering a secondary protection mechanism is met.
3. The battery protection method of claim 1, wherein the sampling the electrical signal of the battery comprises:
the pins at the analog front end are connected with two ends of a plurality of battery units connected in series in the battery through a flat cable, and electric signals for sampling the battery units are obtained by detecting the flat cable;
the judging whether the state of the battery is first power-on or abnormal electric signals comprises the following steps:
and judging whether a suspension signal appears in the flat cable, if so, judging that the state of the battery is the first electrification or the electrical signal abnormity.
4. A protection device for a battery management system, comprising:
a detection unit for sampling the electric signal of the battery;
a processing unit for judging whether to trigger a secondary protection mechanism and whether the state of the battery is the first power-on or the electrical signal is abnormal according to the electrical signal;
the delay unit triggers delay when a secondary protection mechanism is triggered and the battery is electrified for the first time or an electric signal is abnormal; and
and after the delay of the preset time period is ended, sampling the battery again, and starting the electrifying control unit with the secondary protection function under the control of the processing unit when the condition that a secondary protection mechanism is triggered is met.
5. The protection device of the battery management system according to claim 4, wherein the processing unit controls the detection unit to stop sampling the battery within a time period that is delayed by the preset time period until the delay of the preset time period is terminated, and then samples the battery again, and controls the power-on control unit to start a secondary protection function if a condition for triggering a secondary protection mechanism is met; or
And the processing unit controls the detection unit to continuously sample the battery within the time of delaying the preset time period until the delay of the preset time period is terminated, and controls the electrifying control unit to start a secondary protection function if the condition of triggering a secondary protection mechanism is met.
6. The protection device of the battery management system according to claim 4, wherein the detection unit specifically comprises an analog front end, pins of the analog front end are connected with two ends of a plurality of battery units connected in series in the battery through a flat cable, and the flat cable is detected to obtain electrical signals of the plurality of battery units;
the processing unit is an MCU;
the delay unit is a delay circuit which is internally or externally arranged on the MCU;
the power-on control unit includes a switching circuit connected between the battery and a load;
and the MCU determines the state of the battery as the first power-on or the electrical signal abnormity according to whether the suspension signal appears in the flat cable, and if the suspension signal appears, the state of the battery is the first power-on or the electrical signal abnormity.
7. A protection chip of a battery management system, comprising:
a detection circuit for sampling an electrical signal of the battery;
a processor for judging whether to trigger a secondary protection mechanism and whether the state of the battery is the first power-on or the electrical signal is abnormal according to the electrical signal;
a delay circuit for triggering a delay when a secondary protection mechanism is triggered and the battery is powered on for the first time or an electric signal is abnormal; and
and after the delay of the preset time period is ended, sampling the battery again, and starting the power-on control circuit with the secondary protection function under the control of the processor when the condition of triggering the secondary protection mechanism is met.
8. The protection chip of the battery management system according to claim 7, wherein the processor controls the detection circuit to stop sampling the battery for the time of delaying the preset time period, samples the battery again until the delay of the preset time period is terminated, and controls the power-on control circuit to start a secondary protection function if a condition for triggering a secondary protection mechanism is met; or alternatively
And the processor controls the detection circuit to continuously sample the battery within the time of delaying the preset time period until the delay of the preset time period is terminated, and controls the electrifying control circuit to start a secondary protection function if the condition of triggering a secondary protection mechanism is met.
9. The protection chip for the battery management system according to claim 7, wherein the detection circuit specifically comprises an analog front end, pins of the analog front end are connected to two ends of a plurality of battery units connected in series in the battery through a flat cable, and the flat cable is detected to obtain electrical signals of the plurality of battery units;
the processor is an MCU;
the delay circuit is a delay circuit which is internally or externally arranged on the MCU;
the power-on control circuit comprises a switch circuit connected between the battery and a load;
and the MCU determines the state of the battery as the first power-on or the electrical signal abnormity according to whether the suspension signal appears in the flat cable, and if the suspension signal appears, the state of the battery is the first power-on or the electrical signal abnormity.
10. A battery power supply device is characterized by comprising a battery, an analog front end, an MCU, a delay circuit and a power-on control circuit;
the battery comprises a plurality of battery units connected in series;
the pins at the front end of the simulation are connected with two ends of a plurality of battery units connected in series in the battery through a flat cable, and electric signals of the plurality of battery units are obtained by detecting the flat cable;
the analog front end is connected with the MCU;
the MCU is connected with the delay circuit;
the MCU is connected with the power-on control circuit, and the power-on control circuit is connected between the battery and the load.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210291523.0A CN114709885A (en) | 2022-03-23 | 2022-03-23 | Battery protection method, protection device of battery management system, chip and equipment |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210291523.0A CN114709885A (en) | 2022-03-23 | 2022-03-23 | Battery protection method, protection device of battery management system, chip and equipment |
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| CN114709885A true CN114709885A (en) | 2022-07-05 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210291523.0A Pending CN114709885A (en) | 2022-03-23 | 2022-03-23 | Battery protection method, protection device of battery management system, chip and equipment |
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| Country | Link |
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| CN (1) | CN114709885A (en) |
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