CN117584749A - Control method and control device for power battery fuse - Google Patents
Control method and control device for power battery fuse Download PDFInfo
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- CN117584749A CN117584749A CN202311792003.9A CN202311792003A CN117584749A CN 117584749 A CN117584749 A CN 117584749A CN 202311792003 A CN202311792003 A CN 202311792003A CN 117584749 A CN117584749 A CN 117584749A
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Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/04—Cutting off the power supply under fault conditions
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B60—VEHICLES IN GENERAL
- B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
- B60L3/00—Electric devices on electrically-propelled vehicles for safety purposes; Monitoring operating variables, e.g. speed, deceleration or energy consumption
- B60L3/0023—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train
- B60L3/0038—Detecting, eliminating, remedying or compensating for drive train abnormalities, e.g. failures within the drive train relating to sensors
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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
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/60—Other road transportation technologies with climate change mitigation effect
- Y02T10/70—Energy storage systems for electromobility, e.g. batteries
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- Engineering & Computer Science (AREA)
- Life Sciences & Earth Sciences (AREA)
- Sustainable Development (AREA)
- Sustainable Energy (AREA)
- Power Engineering (AREA)
- Transportation (AREA)
- Mechanical Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The application provides a control method and a control device of a power battery fuse, wherein the control method is applied to a BMS in a power battery system, and the power battery system comprises: a fuse and a current sensor disposed on a high voltage main circuit in the power battery system; the control method comprises the following steps: acquiring the current of the high-voltage main loop through the current sensor; determining whether the high-voltage main loop reaches a fusing condition based on the current of the high-voltage main loop; and if the high-voltage main loop reaches a fusing condition, controlling the fuse to be opened. The control method can shorten the time for disconnecting the high-voltage main loop and improve the safety of the high-voltage main loop.
Description
Technical Field
The application relates to the technical field of power batteries, in particular to a control method and a control device of a power battery fuse.
Background
With the development of electric vehicles, electric vehicles are increasingly used in daily life. However, in daily life, safety problems often occur in electric vehicles, such as occurrence of short-circuit spontaneous combustion after an electric vehicle collision, occurrence of short-circuit spontaneous combustion during charging, and the like, which are caused by the power battery of the electric vehicle, and thus, the safety problem of the power battery of the electric vehicle becomes a non-negligible problem.
At present, most of power batteries use high-voltage relays and fuses to jointly realize the high-voltage cutting-off function of the power batteries, so that the high-voltage safety of the power batteries is guaranteed. The high-voltage relay belongs to an active protection piece, and realizes high-voltage down-charging of the power battery through active low-voltage cutoff, but under the condition that the current in a high-voltage loop reaches a large current (for example, 1500A) relative to the high-voltage relay, the relay adhesion risk exists when the high-voltage relay is disconnected, and the high-voltage down-charging of the power battery cannot be completely ensured. In order to ensure that the power battery is powered down under high voltage under the condition, a fuse is added, the fuse belongs to a passive protection piece, and under the condition that the current appears in a high-voltage loop, the fuse is not disconnected immediately because the current which is high current for a high-voltage relay is small current for the fuse, but heat can be accumulated, and the fuse can be fused when the heat accumulation reaches a certain value. However, since the time for the fuse to accumulate heat to blow is generally in the order of seconds, the conventional fuse blows for a relatively long time when the high-voltage circuit in the power battery system fails, resulting in a relatively long time when the high-voltage main circuit is disconnected, and thus the safety of the high-voltage main circuit is reduced.
Disclosure of Invention
In view of the above, an object of the present application is to provide a control method and a control device for a power battery fuse, so as to shorten the time for which a high-voltage main circuit is disconnected and improve the safety of the high-voltage main circuit.
In a first aspect, an embodiment of the present application provides a control method of a power battery fuse, which is applied to a BMS in a power battery system, where the power battery system includes: a fuse and a current sensor disposed on a high voltage main circuit in the power battery system; the control method comprises the following steps:
acquiring the current of the high-voltage main loop through the current sensor;
determining whether the high-voltage main loop reaches a fusing condition based on the current of the high-voltage main loop;
and if the high-voltage main loop reaches a fusing condition, controlling the fuse to be opened.
Optionally, the current sensor includes a first current sensor, and a measuring range of the first current sensor is a first measuring range; the determining whether the high voltage main loop reaches a fusing condition based on the current of the high voltage main loop includes:
determining whether the current of the high-voltage main loop exceeds the upper range limit of the first range;
And if the current of the high-voltage main loop does not exceed the upper range limit of the first range, determining whether the high-voltage main loop reaches a fusing condition or not based on the current of the high-voltage main loop and a preset threshold value.
Optionally, the determining whether the high voltage main circuit reaches the fusing condition based on the current of the high voltage main circuit and a preset threshold value includes:
determining whether the current of the high-voltage main loop is greater than a first preset threshold value and whether the time when the current of the high-voltage main loop is greater than the first preset threshold value reaches a first preset time;
if yes, determining that the high-voltage main loop reaches a fusing condition;
and/or;
determining whether the current of the high-voltage main loop is greater than a second preset threshold value and whether the time when the current of the high-voltage main loop is greater than the second preset threshold value reaches a second preset time;
if yes, determining that the high-voltage main loop reaches a fusing condition;
the first preset threshold value is smaller than the second preset threshold value, and the second preset threshold value is smaller than the upper range limit of the first range; the first preset time is longer than the second preset time.
Optionally, the control method further includes:
if the current of the high-voltage main loop exceeds the upper range limit of the first range, taking the moment that the current of the high-voltage main loop exceeds the upper range limit of the first range as the sampling starting moment;
Acquiring parameter data of the battery pack at the starting sampling time and parameter data of the battery pack at each sampling time after the starting sampling time;
for each sampling time, determining a difference value between the parameter data of the battery pack at the sampling time and the parameter data of the battery pack at the starting sampling time, and determining the difference value as the difference data of the parameter data of the battery pack at the sampling time;
and determining whether the high-voltage main loop reaches a fusing condition based on difference data of the parameter data of the battery pack.
Optionally, the parameter data of the battery pack includes at least one of: the total voltage of the battery pack and the minimum cell voltage of the battery cells in the battery pack; the difference data of the total voltage of the battery pack comprises the total voltage difference of the battery pack; the difference data of the minimum cell voltages of the battery cells in the battery pack includes a cell voltage difference of the minimum cell voltages.
Optionally, the determining whether the high voltage main loop reaches a fusing condition based on the difference data of the parameter data of the battery pack includes:
determining whether the time when the current of the high-voltage main loop exceeds the upper range limit of the first range reaches a third preset time or not;
If yes, determining that the high-voltage main loop reaches a fusing condition;
and/or;
wherein the parameter data of the battery pack includes a total voltage of the battery pack; the difference data of the total voltage of the battery pack comprises the total voltage difference of the battery pack;
determining whether the total voltage difference is greater than a third preset threshold and whether a time when the total voltage difference is greater than the third preset threshold reaches a fourth preset time;
if yes, determining that the high-voltage main loop reaches a fusing condition;
and/or;
wherein the parameter data of the battery pack comprises the minimum cell voltage of the battery cells in the battery pack; the difference data of the minimum cell voltages of the battery cells in the battery pack includes a cell voltage difference of the minimum cell voltages.
Determining whether the minimum monomer voltage difference is greater than a fourth preset threshold and whether the time when the minimum monomer voltage difference is greater than the fourth preset threshold reaches a fifth preset time;
if yes, determining that the high-voltage main loop reaches a fusing condition;
wherein the third preset threshold is greater than the upper range limit of the first range, and the fourth preset threshold is greater than the third preset threshold; the third preset time is longer than the fourth preset time; the fourth preset time is greater than or equal to the fifth preset time.
Optionally, the current sensor further comprises a second current sensor, and the measuring range of the second current sensor is a second measuring range; the upper range limit of the second range is smaller than the upper range limit of the first range;
the first preset threshold is smaller than the upper range limit of the second range, and the second preset threshold is larger than the upper range limit of the second range and smaller than the upper range limit of the first range.
In a second aspect, embodiments of the present application provide a control device of a power battery fuse, where the control device is applied to a power battery system, and the power battery system includes: a fuse and a current sensor disposed on a high voltage main circuit in the power battery system; the control device includes:
the acquisition module is used for acquiring the current of the high-voltage main loop through the current sensor;
the judging module is used for determining whether the high-voltage main loop reaches a fusing condition or not based on the current of the high-voltage main loop;
and the control module is used for controlling the fuse to be disconnected if the high-voltage main loop reaches a fusing condition.
In a third aspect, embodiments of the present application provide a vehicle, including: the device comprises a processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, when the electronic device is running, the processor and the memory are communicated through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the control method of the power battery fuse.
In a fourth aspect, embodiments of the present application provide a computer-readable storage medium having a computer program stored thereon, which when executed by a processor performs the steps of a method of controlling a power cell fuse as described above.
According to the control method and the control device for the power battery fuse, the current of the high-voltage main loop is obtained through the current sensor; determining whether the high-voltage main loop reaches a fusing condition based on the current of the high-voltage main loop; and if the high-voltage main loop reaches a fusing condition, controlling the fuse to be opened. According to the control method, the fuse is directly controlled to be disconnected according to a preset strategy based on the current of the high-voltage main loop, and compared with the existing fuse which is required to be disconnected when heat accumulation reaches a certain value, the control method has the advantages that the time for controlling the fuse to be directly disconnected is shorter (in general in millisecond level), so that the time for disconnecting the high-voltage main loop is shortened, and the safety of the high-voltage main loop is improved.
In order to make the above objects, features and advantages of the present application more comprehensible, preferred embodiments accompanied with figures are described in detail below.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered limiting the scope, and that other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 shows a schematic structural diagram of a power battery system according to an exemplary embodiment of the present application;
fig. 2 is a flowchart illustrating a control method of a power battery fuse according to an exemplary embodiment of the present application;
FIG. 3 illustrates a schematic flow chart of a step of controlling the opening of a fuse provided in an exemplary embodiment of the present application;
fig. 4 is a schematic structural view showing a control device of a power battery fuse according to an exemplary embodiment of the present application;
fig. 5 shows a schematic structural diagram of a vehicle according to an exemplary embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions 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 apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. The components of the embodiments of the present application, which are generally described and illustrated in the figures herein, may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the present application, as provided in the accompanying drawings, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. Based on the embodiments of the present application, every other embodiment that a person skilled in the art would obtain without making any inventive effort is within the scope of protection of the present application.
With the development of electric vehicles, electric vehicles are increasingly used in daily life. However, in daily life, safety problems often occur in electric vehicles, such as occurrence of short-circuit spontaneous combustion after an electric vehicle collision, occurrence of short-circuit spontaneous combustion during charging, and the like, which are caused by the power battery of the electric vehicle, and thus, the safety problem of the power battery of the electric vehicle becomes a non-negligible problem.
At present, most of power batteries use high-voltage relays and fuses to jointly realize the high-voltage cutting-off function of the power batteries, so that the high-voltage safety of the power batteries is guaranteed. The high-voltage relay belongs to an active protection piece, and realizes high-voltage down-charging of the power battery through active low-voltage cutoff, but under the condition that the current in a high-voltage loop reaches a large current (for example, 1500A) relative to the high-voltage relay, the relay adhesion risk exists when the high-voltage relay is disconnected, and the high-voltage down-charging of the power battery cannot be completely ensured. In order to ensure that the power battery is powered down under high voltage under the condition, a fuse is added, the fuse belongs to a passive protection piece, and under the condition that the current appears in a high-voltage loop, the fuse is not disconnected immediately because the current which is high current for a high-voltage relay is small current for the fuse, but heat can be accumulated, and the fuse can be fused when the heat accumulation reaches a certain value. However, since the time for the fuse to accumulate heat to blow is generally in the order of seconds, the conventional fuse blows for a relatively long time when the high-voltage circuit in the power battery system fails, resulting in a relatively long time when the high-voltage main circuit is disconnected, and thus the safety of the high-voltage main circuit is reduced.
Based on this, the embodiment of the application provides a control method of a power battery fuse, which directly controls the fuse to be disconnected according to a preset strategy based on the current of a high-voltage main circuit, and compared with the existing fuse which is required to be disconnected when the heat accumulation reaches a certain value, the control method controls the fuse to be directly disconnected for a shorter time (generally in millisecond level), so that the time for disconnecting the high-voltage main circuit is shortened, and the safety of the high-voltage main circuit is improved.
For ease of understanding, a power cell system provided in exemplary embodiments of the present application will first be described.
Referring to fig. 1, fig. 1 is a schematic diagram illustrating a power battery system according to an exemplary embodiment of the present application.
As shown in fig. 1, in an exemplary embodiment of the present application, the power battery system includes: BMS10, fuse 20 and current sensor 30 disposed on a high voltage main circuit in the power battery system.
Here, the number of the current sensors 10 is at least one. Here, when the number of the current sensors is plural, the types of the current sensors may be different types, and the types of the current sensors may include a Shunt current sensor Shunt and a Hall current sensor Hall, as examples. Here, by setting a plurality of current sensors, the backup function can be achieved, so that the high-voltage main circuit can be disconnected through another current sensor under the condition that one current sensor fails, and the safety of the high-voltage main circuit is ensured. In addition, by setting the types of the plurality of current sensors to different types, it is possible to avoid that in the case where one current sensor fails for one reason, the other current sensor also fails for the same reason, thereby further securing the safety of the high-voltage main circuit.
The power battery system also comprises a high-voltage relay (comprising a main positive relay, a pre-charging relay and a main negative relay) and a pre-charging resistor, wherein the high-voltage relay is arranged on a high-voltage loop of the power battery system.
Furthermore, as shown in fig. 1, additionally, in another exemplary embodiment of the present application, the power battery system may further include a first voltage sampler 40, wherein the first voltage sampler 40 is used to collect the total voltage of the battery pack, and for example, the first voltage sampler may be an HMV.
Furthermore, as shown in fig. 1, additionally, in another exemplary embodiment of the present application, the power battery system may further include a second voltage sampler 50, where the second voltage sampler 50 is used to collect a cell voltage of each battery cell in the battery pack, and for example, the second voltage sampler may be a CMU.
In the case where the power battery system includes the BMS10, the fuse 20, the current sensor 30, the first voltage sampler 40, and the second voltage sampler 50, the BMS10, the fuse 20, the current sensor 30, the first voltage sampler 40, and the second voltage sampler 50 are connected through a CAN bus.
Next, a control method of the power battery fuse provided in the exemplary embodiment of the present application will be described. The control method is applied to the BMS in the above-described power battery system.
Referring to fig. 2, fig. 2 is a flowchart illustrating a control method of a power battery fuse according to an exemplary embodiment of the present application.
As shown in fig. 2, the control method includes:
s100, acquiring the current of the high-voltage main loop through the current sensor;
here, when the number of the current sensors is one (first current sensor), the current of the high-voltage main circuit is acquired by the first current sensor; when the number of the current sensors is plural, for example, 2 (first current sensor and second current sensor), since each current sensor measures the current of the high-voltage main circuit, the current of the high-voltage main circuit measured by each current sensor should be theoretically the same, and thus, the current of the high-voltage main circuit can be obtained by the first current sensor or the second current sensor. The current of the high-voltage main circuit obtained through the first current sensor or the second current sensor can be understood as preset current of the high-voltage main circuit obtained through the first current sensor or the second current sensor, and if the preset current of the high-voltage main circuit obtained through the first current sensor is obtained, the current of the high-voltage main circuit measured by the first current sensor is determined as the current of the high-voltage main circuit. And if the current of the high-voltage main loop is obtained through the second current sensor, determining the current of the high-voltage main loop measured by the second current sensor as the current of the high-voltage main loop.
S200, determining whether the high-voltage main loop reaches a fusing condition or not based on the current of the high-voltage main loop;
and S300, if the high-voltage main loop reaches a fusing condition, controlling the fuse to be opened.
According to the control method provided by the embodiment of the application, the current of the high-voltage main loop is obtained through the current sensor; determining whether the high-voltage main loop reaches a fusing condition based on the current of the high-voltage main loop; and if the high-voltage main loop reaches a fusing condition, controlling the fuse to be opened. Based on the current of the high-voltage main loop, the fuse is directly controlled to be disconnected according to a preset strategy, and compared with the prior fuse which is required to be disconnected when the heat accumulation reaches a certain value, the time for controlling the fuse to be directly disconnected is shorter (generally in millisecond level), so that the time for disconnecting the high-voltage main loop is shortened, and the safety of the high-voltage main loop is improved.
Next, a detailed description will be given of a specific embodiment of determining whether the high voltage main loop reaches a fusing condition based on the current of the high voltage main loop in step S200.
As an example, the current sensor includes a first current sensor having a first range of measurement.
In one embodiment, in the case that the current sensor includes a first current sensor, step S200 of determining whether the high voltage main loop reaches a fusing condition based on the current of the high voltage main loop may include the steps of:
s210, determining whether the current of the high-voltage main loop exceeds the upper range limit of the first range;
s220, if the current of the high-voltage main loop does not exceed the upper range limit of the first range, determining whether the high-voltage main loop reaches a fusing condition or not based on the current of the high-voltage main loop and a preset threshold.
In addition, when the current of the high-voltage main circuit exceeds the upper limit of the first measuring range, the first current sensor cannot measure the current in the high-voltage main circuit quantitatively any more, and therefore whether the high-voltage main circuit reaches the fusing condition cannot be determined according to the current of the high-voltage main circuit.
In another embodiment, in the case that the current sensor includes the first current sensor, additionally, step S200 of determining whether the high voltage main loop reaches a fusing condition based on the current of the high voltage main loop may further include the steps of:
S230, if the current of the high-voltage main loop exceeds the upper range limit of the first range, taking the moment that the current of the high-voltage main loop exceeds the upper range limit of the first range as the sampling starting moment; acquiring parameter data of the battery pack at the starting sampling time and parameter data of the battery pack at each sampling time after the starting sampling time;
s240, for each sampling time, determining a difference value between the parameter data of the battery pack at the sampling time and the parameter data of the battery pack at the starting sampling time, and determining the difference value as the difference data of the parameter data of the battery pack at the sampling time;
as an example, the parameter data of the battery pack may include at least one of: the total voltage of the battery pack and the minimum cell voltage of the battery cells in the battery pack;
here, the difference value may include a difference value, or may include other values that may represent a difference between the parameter data of the battery pack at each sampling time and the parameter data of the battery pack at the starting sampling time, which is not limited in this application.
It is understood that, in the case that the difference value is a difference value, the difference data of the total voltage of the battery pack includes the total voltage difference of the battery pack; the difference data of the minimum cell voltages of the battery cells in the battery pack includes a cell voltage difference of the minimum cell voltages.
S250, determining whether the high-voltage main loop reaches a fusing condition or not based on difference data of parameter data of the battery pack.
Next, a description will be given of a step of determining whether the high-voltage main circuit reaches a fusing condition based on the current of the high-voltage main circuit and a preset threshold value in a case where the current of the high-voltage main circuit does not exceed the upper range limit of the first range.
As a first example, determining whether the current of the high voltage main loop is greater than a first preset threshold and whether a time when the current of the high voltage main loop is greater than the first preset threshold reaches a first preset time; if yes, determining that the high-voltage main loop reaches a fusing condition.
As a second example, determining whether the current of the high voltage main loop is greater than a second preset threshold and whether a time when the current of the high voltage main loop is greater than the second preset threshold reaches a second preset time; if yes, determining that the high-voltage main loop reaches a fusing condition.
Here, the first preset threshold is smaller than the second preset threshold, and the second preset threshold is smaller than an upper range limit of the first range; the first preset time is longer than the second preset time.
As an example, in the case where the current sensor further includes a second current sensor on the basis of including the first current sensor (i.e., in the case where the current sensor includes two), it is assumed that the range of the second current sensor is a second range; the upper range limit of the second range is smaller than the upper range limit of the first range; the first preset threshold and the second preset threshold may be configured as follows: the first preset threshold is smaller than the upper range limit of the second range, and the second preset threshold is larger than the upper range limit of the second range and smaller than the upper range limit of the first range.
By the above manner, it is possible to determine whether the high-voltage main circuit reaches the fusing condition based on the current of the high-voltage main circuit in the case where the current of the high-voltage main circuit does not exceed the upper range limit of the first range.
Next, a step of determining whether the high-voltage main circuit reaches a fusing condition with respect to difference data based on parameter data of the battery pack in the case where the current of the high-voltage main circuit exceeds the upper span limit of the first span will be described.
As a third example, determining whether a time when the current of the high voltage main loop exceeds an upper range limit of the first range reaches a third preset time; if yes, determining that the high-voltage main loop reaches a fusing condition;
As a fourth example, the parameter data of the battery pack includes a total voltage of the battery pack; the difference data of the total voltage of the battery pack comprises the total voltage difference of the battery pack; in this case, the step of determining whether the high voltage main circuit reaches a fusing condition with respect to the difference data based on the parameter data of the battery pack may include: determining whether the total voltage difference is greater than a third preset threshold and whether a time when the total voltage difference is greater than the third preset threshold reaches a fourth preset time; if yes, determining that the high-voltage main loop reaches a fusing condition.
Here, the current in the high-voltage main loop is proportional to the total voltage difference, and the greater the total voltage difference is when the current in the high-voltage main loop is greater; the smaller the total voltage difference, the smaller the current in the high voltage main loop; it will thus be appreciated that assuming an upper range limit of 2000A for the first range, the total voltage difference is different when the current in the high voltage main circuit reaches 2500A and 3000A, and is greater when the current in the high voltage main circuit reaches 3000A. Thus, by setting the third preset threshold value, it is possible to determine the current situation in the high voltage main loop, i.e. the moment when the total voltage difference is greater than the third preset threshold value, indicates that the current in the high voltage main loop has reached a certain value, e.g. reached 3000A.
As a fifth example, the parameter data of the battery pack includes a minimum cell voltage of the battery cells in the battery pack; the difference data of the minimum cell voltage of the battery cells in the battery pack comprises a cell voltage difference of the minimum cell voltage; in this case, the step of determining whether the high voltage main circuit reaches a fusing condition with respect to the difference data based on the parameter data of the battery pack may include: determining whether the minimum monomer voltage difference is greater than a fourth preset threshold and whether the time when the minimum monomer voltage difference is greater than the fourth preset threshold reaches a fifth preset time; if yes, determining that the high-voltage main loop reaches a fusing condition.
Here, the third preset threshold is greater than an upper range limit of the first range, and the fourth preset threshold is greater than the third preset threshold; the third preset time is longer than the fourth preset time; the fourth preset time is greater than or equal to the fifth preset time.
Here, the current in the high-voltage main loop is proportional to a minimum cell voltage difference, and the greater the minimum cell voltage difference is when the current in the high-voltage main loop is greater; the smaller the minimum cell voltage difference when the current in the high voltage main loop is, the smaller; it will thus be appreciated that assuming an upper span limit of the first span of 2000A, the minimum cell voltage difference is different when the current in the high voltage main loop reaches 2700A and 3500A, and is greater when the current in the high voltage main loop reaches 3500A. Thus, by setting the fourth preset threshold value, it is possible to determine the current situation in the high voltage main loop, i.e. the moment when the minimum cell voltage difference is greater than the fourth preset threshold value, indicates that the current in the high voltage main loop has reached a certain value, e.g. 3500A.
It may be understood that the conditions corresponding to at least one of the above five examples may be included in the present application.
Next, the steps of controlling the opening of the fuse under the conditions corresponding to the embodiments of the present application including all of the above-described five examples will be described. The step of controlling the opening of the fuse under the condition corresponding to any one or several examples in the above five examples in the present application may refer to the step of this example.
Referring to fig. 3, fig. 3 is a schematic flow chart showing steps for controlling the opening of a fuse according to an exemplary embodiment of the present application. The conditions for determining whether the high-voltage main circuit reaches the fusing condition based on the difference data of the parameter data of the battery pack comprise the conditions corresponding to all five examples.
As shown in fig. 3, the step of controlling the opening of the fuse may include: in step S100, the current of the high-voltage main circuit is obtained through the current sensor, then in step S210, it is determined whether the current of the high-voltage main circuit exceeds the upper range limit of the first range, on the one hand, if the current of the high-voltage main circuit does not exceed the upper range limit of the first range, in step S221, it is determined whether the current of the high-voltage main circuit is greater than a first preset threshold value and the time when the current of the high-voltage main circuit is greater than the first preset threshold value reaches a first preset time, if so, it is directly determined that the high-voltage main circuit reaches a fusing condition, and in step S300, the fuse is controlled to be opened; if not, then in step S222, determining whether the current of the high-voltage main circuit is greater than a second preset threshold value and whether the time when the current of the high-voltage main circuit is greater than the second preset threshold value reaches a second preset time, if yes, directly determining that the high-voltage main circuit reaches a fusing condition, and in step S300, controlling the fuse to be opened; if not, return to step S210 and determine whether the current of the high voltage main loop exceeds the upper span limit of the first span. On the other hand, if the current of the high-voltage main circuit exceeds the upper limit of the first measuring range, in step S230, taking the time when the current of the high-voltage main circuit exceeds the upper limit of the first measuring range as a start sampling time, acquiring the parameter data of the battery pack at the start sampling time and the parameter data of the battery pack at each sampling time after the start sampling time; then, at step S240, for each sampling time, a difference value between the parameter data of the battery pack at the sampling time and the parameter data of the battery pack at the starting sampling time is determined, the difference value is determined as the difference data of the parameter data of the battery pack at the sampling time, then, at step S251, it is determined whether the time when the current of the high-voltage main loop exceeds the upper range limit of the first range reaches a third preset time, if yes, it is directly determined that the high-voltage main loop reaches a fusing condition, if no, then, at step S252, it is determined whether the total voltage difference is greater than the third preset threshold and the time when the total voltage difference is greater than the third preset threshold reaches a fourth preset time, if yes, it is directly determined that the high-voltage main loop reaches the fusing condition, if no, then, at step S253, it is directly determined whether the minimum cell voltage difference is greater than the fourth preset threshold and the time when the minimum cell voltage difference is greater than the fourth preset threshold reaches the fifth preset time, if yes, and if no, it is determined that the high-voltage main loop reaches the upper range limit is returned to the first range.
In summary, according to the control method for the power battery fuse provided by the embodiment of the application, the fuse can be directly controlled to be disconnected according to the preset strategy based on the current of the high-voltage main circuit, and compared with the existing fuse which is required to be disconnected when the heat accumulation reaches a certain value, the control method for the power battery fuse is shorter in time (generally in millisecond level) for controlling the fuse to be directly disconnected, so that the time for disconnecting the high-voltage main circuit is shortened, and the safety of the high-voltage main circuit is improved. In addition, in the process of directly controlling the disconnection of the fuse according to the preset strategy, when the current in the high-voltage main circuit is larger, the preset time is shorter, and in this way, the requirement of judging the high-voltage main circuit as reaching the fusing condition can be reduced under the condition that the current is larger, the time for disconnecting the high-voltage main circuit is further shortened, and the safety of the high-voltage main circuit is improved.
Based on the same inventive concept, the embodiment of the present application further provides a control device of the power battery fuse corresponding to the control method of the power battery fuse, and since the principle of solving the problem by the device in the embodiment of the present application is similar to that of the method in the embodiment of the present application, the implementation of the device may refer to the implementation of the method, and the repetition is omitted.
Referring to fig. 4, fig. 4 is a schematic structural diagram of a control device for a power battery fuse according to an exemplary embodiment of the present application.
As shown in fig. 4, the control device includes:
an acquisition module 410, configured to acquire, by using the current sensor, a current of the high-voltage main loop;
a judging module 420, configured to determine, based on the current of the high-voltage main circuit, whether the high-voltage main circuit reaches a fusing condition;
and a control module 430, configured to control the fuse to open if the high-voltage main circuit reaches a fusing condition.
Optionally, the current sensor includes a first current sensor, and a measuring range of the first current sensor is a first measuring range; the judging module 420 is specifically configured to:
determining whether the current of the high-voltage main loop exceeds the upper range limit of the first range;
and if the current of the high-voltage main loop does not exceed the upper range limit of the first range, determining whether the high-voltage main loop reaches a fusing condition or not based on the current of the high-voltage main loop and a preset threshold value.
Optionally, the judging module 420 is specifically configured to:
determining whether the current of the high-voltage main loop is greater than a first preset threshold value and whether the time when the current of the high-voltage main loop is greater than the first preset threshold value reaches a first preset time;
If yes, determining that the high-voltage main loop reaches a fusing condition;
and/or;
determining whether the current of the high-voltage main loop is greater than a second preset threshold value and whether the time when the current of the high-voltage main loop is greater than the second preset threshold value reaches a second preset time;
if yes, determining that the high-voltage main loop reaches a fusing condition;
the first preset threshold value is smaller than the second preset threshold value, and the second preset threshold value is smaller than the upper range limit of the first range; the first preset time is longer than the second preset time.
Optionally, the judging module 420 is specifically further configured to:
if the current of the high-voltage main loop exceeds the upper range limit of the first range, taking the moment that the current of the high-voltage main loop exceeds the upper range limit of the first range as the sampling starting moment;
acquiring parameter data of the battery pack at the starting sampling time and parameter data of the battery pack at each sampling time after the starting sampling time;
for each sampling time, determining a difference value between the parameter data of the battery pack at the sampling time and the parameter data of the battery pack at the starting sampling time, and determining the difference value as the difference data of the parameter data of the battery pack at the sampling time;
And determining whether the high-voltage main loop reaches a fusing condition based on difference data of the parameter data of the battery pack.
Optionally, the parameter data of the battery pack includes at least one of: the total voltage of the battery pack and the minimum cell voltage of the battery cells in the battery pack; the difference data of the total voltage of the battery pack comprises the total voltage difference of the battery pack; the difference data of the minimum cell voltages of the battery cells in the battery pack includes a cell voltage difference of the minimum cell voltages.
Optionally, the judging module 420 is specifically configured to:
determining whether the time when the current of the high-voltage main loop exceeds the upper range limit of the first range reaches a third preset time or not;
if yes, determining that the high-voltage main loop reaches a fusing condition;
and/or;
wherein the parameter data of the battery pack includes a total voltage of the battery pack; the difference data of the total voltage of the battery pack comprises the total voltage difference of the battery pack;
determining whether the total voltage difference is greater than a third preset threshold and whether a time when the total voltage difference is greater than the third preset threshold reaches a fourth preset time;
if yes, determining that the high-voltage main loop reaches a fusing condition;
And/or;
wherein the parameter data of the battery pack comprises the minimum cell voltage of the battery cells in the battery pack; the difference data of the minimum cell voltages of the battery cells in the battery pack includes a cell voltage difference of the minimum cell voltages.
Determining whether the minimum monomer voltage difference is greater than a fourth preset threshold and whether the time when the minimum monomer voltage difference is greater than the fourth preset threshold reaches a fifth preset time;
if yes, determining that the high-voltage main loop reaches a fusing condition;
wherein the third preset threshold is greater than the upper range limit of the first range, and the fourth preset threshold is greater than the third preset threshold; the third preset time is longer than the fourth preset time; the fourth preset time is greater than or equal to the fifth preset time.
Optionally, the current sensor further comprises a second current sensor, and the measuring range of the second current sensor is a second measuring range; the upper range limit of the second range is smaller than the upper range limit of the first range;
the first preset threshold is smaller than the upper range limit of the second range, and the second preset threshold is larger than the upper range limit of the second range and smaller than the upper range limit of the first range.
According to the control device provided by the embodiment of the application, the current of the high-voltage main loop is obtained through the current sensor; determining whether the high-voltage main loop reaches a fusing condition based on the current of the high-voltage main loop; and if the high-voltage main loop reaches a fusing condition, controlling the fuse to be opened. Based on the current of the high-voltage main loop, the fuse is directly controlled to be disconnected according to a preset strategy, and compared with the prior fuse which is required to be disconnected when the heat accumulation reaches a certain value, the time for controlling the fuse to be directly disconnected is shorter (generally in millisecond level), so that the time for disconnecting the high-voltage main loop is shortened, and the safety of the high-voltage main loop is improved.
Referring to fig. 5, fig. 5 is a schematic structural diagram of a vehicle according to an embodiment of the present application. As shown in fig. 5, the vehicle 500 includes a processor 510, a memory 520, and a bus 530.
The memory 520 stores machine-readable instructions executable by the processor 510, and when the electronic device 500 is running, the processor 510 communicates with the memory 520 through the bus 530, and when the machine-readable instructions are executed by the processor 510, the steps of the method for controlling the power battery fuse in the method embodiment described above may be executed, and the specific implementation may refer to the method embodiment and will not be described herein.
The embodiment of the present application further provides a computer readable storage medium, where a computer program is stored on the computer readable storage medium, and when the computer program is executed by a processor, the steps of the method for controlling a power battery fuse in the above method embodiment may be executed, and a specific implementation manner may refer to the method embodiment and will not be described herein.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described systems, apparatuses and units may refer to corresponding procedures in the foregoing method embodiments, and are not repeated herein.
In the several embodiments provided in this application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, for example, the division of the units is merely a logical function division, and there may be other manners of division in actual implementation, and for example, multiple units or components may be combined or integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, device or unit indirect coupling or communication connection, which may be in electrical, mechanical or other form.
The units described as separate units may or may not be physically separate, and units shown as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in each embodiment of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on such understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, including several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the methods described in the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-Only Memory (ROM), a random access Memory (Random Access Memory, RAM), a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Finally, it should be noted that: the foregoing examples are merely specific embodiments of the present application, and are not intended to limit the scope of the present application, but the present application is not limited thereto, and those skilled in the art will appreciate that while the foregoing examples are described in detail, the present application is not limited thereto. Any person skilled in the art may modify or easily conceive of the technical solution described in the foregoing embodiments, or make equivalent substitutions for some of the technical features within the technical scope of the disclosure of the present application; such modifications, changes or substitutions do not depart from the spirit and scope of the technical solutions of the embodiments of the present application, and are intended to be included in the scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.
Claims (10)
1. A control method of a power battery fuse, characterized by being applied to a BMS in a power battery system comprising: a fuse and a current sensor disposed on a high voltage main circuit in the power battery system; the control method comprises the following steps:
Acquiring the current of the high-voltage main loop through the current sensor;
determining whether the high-voltage main loop reaches a fusing condition based on the current of the high-voltage main loop;
and if the high-voltage main loop reaches a fusing condition, controlling the fuse to be opened.
2. The control method according to claim 1, wherein the current sensor includes a first current sensor whose range is a first range; the determining whether the high voltage main loop reaches a fusing condition based on the current of the high voltage main loop includes:
determining whether the current of the high-voltage main loop exceeds the upper range limit of the first range;
and if the current of the high-voltage main loop does not exceed the upper range limit of the first range, determining whether the high-voltage main loop reaches a fusing condition or not based on the current of the high-voltage main loop and a preset threshold value.
3. The control method according to claim 2, wherein the determining whether the high-voltage main circuit reaches a fusing condition based on the current of the high-voltage main circuit and a preset threshold value includes:
determining whether the current of the high-voltage main loop is greater than a first preset threshold value and whether the time when the current of the high-voltage main loop is greater than the first preset threshold value reaches a first preset time;
If yes, determining that the high-voltage main loop reaches a fusing condition;
and/or;
determining whether the current of the high-voltage main loop is greater than a second preset threshold value and whether the time when the current of the high-voltage main loop is greater than the second preset threshold value reaches a second preset time;
if yes, determining that the high-voltage main loop reaches a fusing condition;
the first preset threshold value is smaller than the second preset threshold value, and the second preset threshold value is smaller than the upper range limit of the first range; the first preset time is longer than the second preset time.
4. The control method according to claim 2, characterized in that the control method further comprises:
if the current of the high-voltage main loop exceeds the upper limit of the first measuring range, taking the moment when the current of the high-voltage main loop exceeds the upper limit of the first measuring range as a starting sampling moment, and acquiring the parameter data of the battery pack at the starting sampling moment and the parameter data of the battery pack at each sampling moment after the starting sampling moment;
for each sampling time, determining a difference value between the parameter data of the battery pack at the sampling time and the parameter data of the battery pack at the starting sampling time, and determining the difference value as the difference data of the parameter data of the battery pack at the sampling time;
And determining whether the high-voltage main loop reaches a fusing condition based on difference data of the parameter data of the battery pack.
5. The control method according to claim 4, wherein the parameter data of the battery pack includes at least one of: the total voltage of the battery pack and the minimum cell voltage of the battery cells in the battery pack; the difference data of the total voltage of the battery pack comprises the total voltage difference of the battery pack; the difference data of the minimum cell voltages of the battery cells in the battery pack includes a cell voltage difference of the minimum cell voltages.
6. The control method according to claim 5, wherein the determining whether the high-voltage main circuit reaches a fusing condition based on the difference data of the parameter data of the battery pack includes:
determining whether the time when the current of the high-voltage main loop exceeds the upper range limit of the first range reaches a third preset time or not;
if yes, determining that the high-voltage main loop reaches a fusing condition;
and/or;
wherein the parameter data of the battery pack includes a total voltage of the battery pack; the difference data of the total voltage of the battery pack comprises the total voltage difference of the battery pack;
determining whether the total voltage difference is greater than a third preset threshold and whether a time when the total voltage difference is greater than the third preset threshold reaches a fourth preset time;
If yes, determining that the high-voltage main loop reaches a fusing condition;
and/or;
wherein the parameter data of the battery pack comprises the minimum cell voltage of the battery cells in the battery pack; the difference data of the minimum cell voltages of the battery cells in the battery pack includes a cell voltage difference of the minimum cell voltages.
Determining whether the minimum monomer voltage difference is greater than a fourth preset threshold and whether the time when the minimum monomer voltage difference is greater than the fourth preset threshold reaches a fifth preset time;
if yes, determining that the high-voltage main loop reaches a fusing condition;
wherein the third preset threshold is greater than the upper range limit of the first range, and the fourth preset threshold is greater than the third preset threshold; the third preset time is longer than the fourth preset time; the fourth preset time is greater than or equal to the fifth preset time.
7. A control method according to claim 3, wherein the current sensor further comprises a second current sensor, the second current sensor having a second range; the upper range limit of the second range is smaller than the upper range limit of the first range;
the first preset threshold is smaller than the upper range limit of the second range, and the second preset threshold is larger than the upper range limit of the second range and smaller than the upper range limit of the first range.
8. A control device of a power battery fuse, the control device being applied to a BMS in a power battery system including: a fuse and a current sensor disposed on a high voltage main circuit in the power battery system; the control device includes:
the acquisition module is used for acquiring the current of the high-voltage main loop through the current sensor;
the judging module is used for determining whether the high-voltage main loop reaches a fusing condition or not based on the current of the high-voltage main loop;
and the control module is used for controlling the fuse to be disconnected if the high-voltage main loop reaches a fusing condition.
9. A vehicle, characterized by comprising: a processor, a memory and a bus, said memory storing machine readable instructions executable by said processor, said processor and said memory communicating via said bus when the electronic device is operating, said machine readable instructions when executed by said processor performing the steps of the method of controlling a power cell fuse as claimed in any one of claims 1 to 7.
10. A computer-readable storage medium, characterized in that the computer-readable storage medium has stored thereon a computer program which, when executed by a processor, performs the steps of the control method of a power cell fuse as claimed in any one of claims 1 to 7.
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| CN202311792003.9A CN117584749A (en) | 2023-12-22 | 2023-12-22 | Control method and control device for power battery fuse |
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| CN202311792003.9A CN117584749A (en) | 2023-12-22 | 2023-12-22 | Control method and control device for power battery fuse |
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