Power battery fuse control method, control apparatus, and storage medium

Abstract

A power battery fuse control method, a control apparatus, and a storage medium. The control method is used for a BMS (10) in a power battery system. The power battery system comprises: a fuse (20) and a current sensor (30) provided on a high-voltage main circuit in the power battery system. The control method comprises: by means of the current sensor (30), acquiring a current of the high-voltage main circuit; based on the current of the high-voltage main circuit, determining whether the high-voltage main circuit satisfies a fusing condition; and if the high-voltage main circuit satisfies the fusing condition, controlling the fuse (20) to be disconnected. The control method can shorten a disconnection time of the high-voltage main circuit, and improve fusing efficiency of the high-voltage main circuit.

Description

POWER BATTERY FUSE CONTROL METHOD, CONTROL APPARATUS, AND STORAGE MEDIUM CROSS-REFERENCE TO THE RELATED APPLICATIONS[1] The present disclosure claims priority to Chinese Patent Application No. 2023117920039, filed with the China National Intellectual Property Administration on December 22, 2023, and entitled "POWER BATTERY FUSE CONTROL METHOD AND CONTROL APPARATUS", the entire contents of which are incorporated herein by reference. TECHNICAL FIELD[2] The present disclosure relates to the technical field of power batteries, and in particular, to a power battery fuse control method, a control apparatus, and a storage medium. BACKGROUND[3] With the development of electric vehicles, electric vehicles are increasingly widely used in daily life. However, in daily life, electric vehicles frequently exhibit safety issues; for example, short-circuit self-ignition after an electric vehicle collision, and short-circuit self-ignition during a charging process. These safety issues are all caused by the power battery of the electric vehicle; therefore, the safety issue of the power battery of the electric vehicle has become a problem that cannot be ignored.[4] Most power batteries use a high-voltage relay and a fuse together to jointly implement a high-voltage cut-off function of the power battery, thereby ensuring high-voltage safety of the power battery. The high-voltage relay belongs to an active protection component, and the high-voltage relay implements high-voltage power-down of the power battery through active low-voltage disconnection. However, when a current in the high-voltage circuit reaches a large current relative to the high-voltage relay (for example, 1500A), disconnecting the high-voltage relay entails a risk of relay welding, and high-voltage power-down of the power battery cannot be completely guaranteed. In order to guarantee high-voltage power-down of the power battery in this case, a fuse is added. The fuse belongs to a passive protection component. When the above current appears in the high-voltage circuit, because the current that is a large current relative to the high-voltage relay is a small current relative to the fuse, the fuse will not disconnect immediately, but will accumulate heat, and will fuse only when the heat accumulation reaches a certain value. SUMMARY[5] In view of the foregoing, an objective of the present disclosure is to provide a power battery fuse control method, a control apparatus, and a storage medium, so as to shorten a disconnection time of a high-voltage main circuit, and improve fusing efficiency of the high-voltage main circuit.[6] In a first aspect, embodiments of the present disclosure provide a power battery fuse control method, applied to a BMS in a power battery system. The power battery system comprises: a fuse and a current sensor provided on a high-voltage main circuit in the power battery system. The control method comprises:[7] acquiring a current of the high-voltage main circuit by means of the current sensor;[8] determining whether the high-voltage main circuit satisfies a fusing condition based on the current of the high-voltage main circuit; and[9] if the high-voltage main circuit satisfies the fusing condition, controlling the fuse to be disconnected.

[10] Optionally, the current sensor comprises a first current sensor, and a measurement range of the first current sensor is a first measurement range. The determining whether the high-voltage main circuit satisfies a fusing condition based on the current of the high-voltage main circuit comprises:

[11] determining whether the current of the high-voltage main circuit exceeds an upper limit of the first measurement range; and

[12] if the current of the high-voltage main circuit does not exceed the upper limit of the first measurement range, determining whether the high-voltage main circuit satisfies the fusing condition based on the current of the high-voltage main circuit and a preset threshold.

[13] Optionally, the determining whether the high-voltage main circuit satisfies the fusing condition based on the current of the high-voltage main circuit and a preset threshold comprises:

[14] determining whether the current of the high-voltage main circuit is greater than a first preset threshold and whether a time for which the current of the high-voltage main circuit is greater than the first preset threshold reaches a first preset time;

[15] if yes, determining that the high-voltage main circuit satisfies the fusing condition;

[16] and / or;

[17] determining whether the current of the high-voltage main circuit is greater than a second preset threshold and whether a time for which the current of the high-voltage main circuit is greater than the second preset threshold reaches a second preset time;

[18] if yes, determining that the high-voltage main circuit satisfies the fusing condition;

[19] wherein the first preset threshold is less than the second preset threshold, the second preset threshold is less than the upper limit of the first measurement range, and the first preset time is greater than the second preset time.

[20] Optionally, the control method further comprises:

[21] if the current of the high-voltage main circuit exceeds the upper limit of the first measurement range, using a moment at which the current of the high-voltage main circuit exceeds the upper limit of the first measurement range as a start sampling moment;

[22] acquiring parameter data of the battery pack at the start sampling moment and parameter data of the battery pack at each sampling moment after the start sampling moment;

[23] for each sampling moment, determining a difference value between the parameter data of the battery pack at the sampling moment and the parameter data of the battery pack at the start sampling moment, and using the difference value as difference data of the parameter data of the battery pack at the sampling moment; and

[24] determining whether the high-voltage main circuit satisfies the fusing condition based on the difference data of the parameter data of the battery pack.

[25] Optionally, the parameter data of the battery pack comprises at least one of the following items: a total voltage of the battery pack and a minimum cell voltage of battery cells in the battery pack; the difference data of the total voltage of the battery pack comprises a total voltage difference of the battery pack; and 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.

[26] Optionally, the determining whether the high-voltage main circuit satisfies the fusing condition based on the difference data of the parameter data of the battery pack comprises:

[27] determining whether a time for which the current of the high-voltage main circuit exceeds the upper limit of the first measurement range reaches a third preset time;

[28] if yes, determining that the high-voltage main circuit satisfies the fusing condition;

[29] and / or;

[30] wherein the parameter data of the battery pack comprises the total voltage of the battery pack, and the difference data of the total voltage of the battery pack comprises the total voltage difference of the battery pack;

[31] determining whether the total voltage difference is greater than a third preset threshold and whether a time for which the total voltage difference is greater than the third preset threshold reaches a fourth preset time;

[32] if yes, determining that the high-voltage main circuit satisfies the fusing condition;

[33] and / or;

[34] wherein the parameter data of the battery pack comprises the minimum cell voltage of the battery cells in the battery pack, and the difference data of the minimum cell voltage of the battery cells in the battery pack comprises the cell voltage difference of the minimum cell voltage;

[35] determining whether the cell voltage difference of the minimum cell voltage is greater than a fourth preset threshold and whether a time for which the cell voltage difference of the minimum cell voltage is greater than the fourth preset threshold reaches a fifth preset time;

[36] if yes, determining that the high-voltage main circuit satisfies the fusing condition;

[37] wherein the third preset threshold is greater than the upper limit of the first measurement range, and the fourth preset threshold is greater than the third preset threshold; the third preset time is greater than the fourth preset time, and the fourth preset time is greater than or equal to the fifth preset time.

[38] Optionally, the current sensor further comprises a second current sensor, and a measurement range of the second current sensor is a second measurement range; an upper limit of the second measurement range is less than the upper limit of the first measurement range;

[39] the first preset threshold is less than the upper limit of the second measurement range, and the second preset threshold is greater than the upper limit of the second measurement range and less than the upper limit of the first measurement range.

[40] In a second aspect, embodiments of the present disclosure provide a power battery fuse control apparatus. The control apparatus is applied to a power battery system. The power battery system comprises: a fuse and a current sensor provided on a high-voltage main circuit in the power battery system. The control apparatus comprises:

[41] an acquisition module, configured to acquire a current of the high-voltage main circuit by means of the current sensor;

[42] a determination module, configured to determine whether the high-voltage main circuit satisfies a fusing condition based on the current of the high-voltage main circuit; and

[43] a control module, configured to: if the high-voltage main circuit satisfies the fusing condition, control the fuse to be disconnected.

[44] In a third aspect, embodiments of the present disclosure provide a vehicle, comprising: a processor, a memory, and a bus. The memory stores machine-readable instructions executable by the processor. When an electronic device runs, the processor communicates with the memory via the bus, and when the machine-readable instructions are executed by the processor, steps of the above-described power battery fuse control method are performed.

[45] In a fourth aspect, embodiments of the present disclosure provide a computer-readable storage medium. A computer program is stored on the computer-readable storage medium, and when the computer program is run by a processor, steps of the above-described power battery fuse control method are executed. BRIEF DESCRIPTION OF THE DRAWINGS

[46] In order to explain technical solutions of embodiments of the present disclosure more clearly, drawings to be used in the embodiments will be briefly introduced below. It should be understood that the following drawings merely show some embodiments of the present disclosure, and therefore should not be considered as a limitation on the scope. For a person of ordinary skill in the art, other related drawings may be obtained based on these drawings without creative efforts.

[47] FIG. 1 shows a structural schematic diagram of a power battery system provided by an exemplary embodiment of the present disclosure;

[48] FIG. 2 shows a flowchart of a power battery fuse control method provided by an exemplary embodiment of the present disclosure;

[49] FIG. 3 shows a schematic flowchart of steps of controlling a fuse to be disconnected provided by an exemplary embodiment of the present disclosure;

[50] FIG. 4 shows a structural schematic diagram of a power battery fuse control apparatus provided by an exemplary embodiment of the present disclosure; and

[51] FIG. 5 shows a structural schematic diagram of a vehicle provided by an exemplary embodiment of the present disclosure. DETAILED DESCRIPTION OF THE EMBODIMENTS

[52] In order to make objectives, technical solutions, and advantages of embodiments of the present disclosure clearer, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below with reference to the drawings in the embodiments of the present disclosure. Apparently, the described embodiments are merely a part of the embodiments of the present disclosure, rather than all of the embodiments. Components of embodiments of the present disclosure described and shown in the drawings herein may be arranged and designed in various different configurations. Therefore, the following detailed description of embodiments of the present disclosure provided in the drawings is not intended to limit the scope of the present disclosure as claimed, but is merely representative of selected embodiments of the present disclosure. Based on the embodiments of the present disclosure, all other embodiments obtained by a person skilled in the art without creative efforts shall fall within the protection scope of the present disclosure.

[53] With the development of electric vehicles, electric vehicles are increasingly widely used in daily life. However, in daily life, electric vehicles frequently exhibit safety issues; for example, short-circuit self-ignition after an electric vehicle collision, and short-circuit self-ignition during a charging process. These safety issues are all caused by the power battery of the electric vehicle; therefore, the safety issue of the power battery of the electric vehicle has become a problem that cannot be ignored.

[54] Most power batteries use a high-voltage relay and a fuse together to jointly implement a high-voltage cut-off function of the power battery, thereby ensuring high-voltage safety of the power battery. The high-voltage relay belongs to an active protection component, and the high-voltage relay implements high-voltage power-down of the power battery through active low-voltage disconnection. However, when a current in the high-voltage circuit reaches a large current relative to the high-voltage relay (for example, 1500A), disconnecting the high-voltage relay entails a risk of relay welding, and high-voltage power-down of the power battery cannot be completely guaranteed. In order to guarantee high-voltage power-down of the power battery in this case, a fuse is added. The fuse belongs to a passive protection component. When the above current appears in the high-voltage circuit, because the current that is a large current relative to the high-voltage relay is a small current relative to the fuse, the fuse will not disconnect immediately, but will accumulate heat, and will fuse only when the heat accumulation reaches a certain value.

[55] Based on this, embodiments of the present disclosure provide a power battery fuse control method. The control method, based on a current of a high-voltage main circuit, directly controls the fuse to be disconnected according to a predetermined strategy. The fuse no longer needs to accumulate heat and fuse only when the heat accumulation reaches a certain value. A time for directly controlling the fuse to be disconnected is shorter (generally at a millisecond level); therefore, the disconnection time of the high-voltage main circuit is shortened, and the fusing efficiency of the high-voltage main circuit is improved.

[56] For ease of understanding, a power battery system provided by an exemplary embodiment of the present disclosure will first be introduced.

[57] Please refer to FIG. 1. FIG. 1 shows a structural schematic diagram of a power battery system provided by an exemplary embodiment of the present disclosure.

[58] As shown in FIG. 1, in an exemplary embodiment of the present disclosure, the power battery system comprises: a BMS 10, a fuse 20 and a current sensor 30 provided on a high-voltage main circuit in the power battery system.

[59] Here, the number of the current sensors 10 is at least one. Here, when the number of the current sensors is plural, types of the current sensors may be different types. As an example, the types of the current sensors may comprise a shunt current sensor Shunt and a Hall current sensor Hall. Here, by providing a plurality of current sensors, a backup function may be achieved, so that when one current sensor fails, the high-voltage main circuit may also be disconnected through another current sensor, ensuring safety of the high-voltage main circuit. In addition, by setting types of the plurality of current sensors to different types, it is possible to avoid a situation in which, when one current sensor fails due to one reason, another current sensor also fails due to the same reason, thereby further ensuring safety of the high-voltage main circuit.

[60] The power battery system further comprises a high-voltage relay (comprising: a main positive relay, a pre-charge relay, and a main negative relay) and a pre-charge resistor. The high-voltage relay is provided on a high-voltage circuit of the power battery system.

[61] In addition, as shown in FIG. 1, additionally, in another exemplary embodiment of the present disclosure, the power battery system may further comprise a first voltage sampler 40, wherein the first voltage sampler 40 is used for collecting a total voltage of a battery pack. For example, the first voltage sampler may be an HMV.

[62] In addition, as shown in FIG. 1, additionally, in another exemplary embodiment of the present disclosure, the power battery system may further comprise a second voltage sampler 50, wherein the second voltage sampler 50 is used for collecting a cell voltage of each battery cell in a battery pack. For example, the second voltage sampler may be a CMU.

[63] When the power battery system comprises a BMS 10, a fuse 20, a current sensor 30, a first voltage sampler 40, and a second voltage sampler 50, the BMS 10, the fuse 20, the current sensor 30, the first voltage sampler 40, and the second voltage sampler 50 are connected via a CAN bus.

[64] A power battery fuse control method provided by an exemplary embodiment of the present disclosure will be described below. The control method is applied to the BMS in the above-described power battery system.

[65] Please refer to FIG. 2. FIG. 2 shows a flowchart of a power battery fuse control method provided by an exemplary embodiment of the present disclosure.

[66] As shown in FIG. 2, the control method comprises:

[67] S100: acquiring a current of the high-voltage main circuit by means of the current sensor;

[68] here, when the number of the current sensors is one (a first current sensor), the current of the high-voltage main circuit is acquired by means of the first current sensor; when the number of the current sensors is plural, for example, two (a first current sensor and a second current sensor), because each current sensor measures the current of the high-voltage main circuit, currents of the high-voltage main circuit measured by the respective current sensors should theoretically be the same; therefore, the current of the high-voltage main circuit may be acquired by means of the first current sensor or the second current sensor. Acquiring the current of the high-voltage main circuit by means of the first current sensor or the second current sensor may be understood as pre-setting whether to acquire the current of the high-voltage main circuit by means of the first current sensor or by means of the second current sensor. If it is pre-set to acquire the current of the high-voltage main circuit by means of the first current sensor, 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. If it is pre-set to acquire the current of the high-voltage main circuit by means of the second current sensor, the current of the high-voltage main circuit measured by the second current sensor is determined as the current of the high-voltage main circuit.

[69] S200: determining whether the high-voltage main circuit satisfies a fusing condition based on the current of the high-voltage main circuit; and

[70] S300: if the high-voltage main circuit satisfies the fusing condition, controlling the fuse to be disconnected.

[71] The control method provided by the embodiments of the present disclosure acquires the current of the high-voltage main circuit by means of the current sensor; determines whether the high-voltage main circuit satisfies a fusing condition based on the current of the high-voltage main circuit; and if the high-voltage main circuit satisfies the fusing condition, controls the fuse to be disconnected. Based on the current of the high-voltage main circuit, the fuse is directly controlled to be disconnected according to a predetermined strategy. The fuse no longer needs to accumulate heat and fuse only when the heat accumulation reaches a certain value. A time for directly controlling the fuse to be disconnected is shorter (generally at a millisecond level); therefore, the disconnection time of the high-voltage main circuit is shortened, and the fusing efficiency of the high-voltage main circuit is improved.

[72] Details of step S200, determining whether the high-voltage main circuit satisfies a fusing condition based on the current of the high-voltage main circuit, will be described in detail below.

[73] As an example, the current sensor comprises a first current sensor, and a measurement range of the first current sensor is a first measurement range.

[74] In one embodiment, when the current sensor comprises a first current sensor, step S200, determining whether the high-voltage main circuit satisfies a fusing condition based on the current of the high-voltage main circuit, may comprise the following steps:

[75] S210: determining whether the current of the high-voltage main circuit exceeds an upper limit of the first measurement range; and

[76] S220: if the current of the high-voltage main circuit does not exceed the upper limit of the first measurement range, determining whether the high-voltage main circuit satisfies the fusing condition based on the current of the high-voltage main circuit and a preset threshold.

[77] In addition, when the current of the high-voltage main circuit exceeds the upper limit of the first measurement range, the first current sensor can no longer quantitatively measure the current in the high-voltage main circuit, and can no longer determine whether the high-voltage main circuit satisfies the fusing condition according to the current of the high-voltage main circuit. In order to solve this problem, embodiments of the present disclosure provide a manner of determining whether the high-voltage main circuit satisfies the fusing condition when the current of the high-voltage main circuit exceeds the upper limit of the first measurement range.

[78] In another embodiment, when the current sensor comprises a first current sensor, additionally, step S200, determining whether the high-voltage main circuit satisfies a fusing condition based on the current of the high-voltage main circuit, may further comprise the following steps:

[79] S230: if the current of the high-voltage main circuit exceeds the upper limit of the first measurement range, using a moment at which the current of the high-voltage main circuit exceeds the upper limit of the first measurement range as a start sampling moment; acquiring parameter data of the battery pack at the start sampling moment and parameter data of the battery pack at each sampling moment after the start sampling moment;

[80] S240: for each sampling moment, determining a difference value between the parameter data of the battery pack at the sampling moment and the parameter data of the battery pack at the start sampling moment, and using the difference value as difference data of the parameter data of the battery pack at the sampling moment;

[81] as an example, the parameter data of the battery pack may comprise at least one of the following items: a total voltage of the battery pack and a minimum cell voltage of battery cells in the battery pack;

[82] here, the difference value may comprise a difference, and may also comprise another value that can reflect a difference between the parameter data of the battery pack at each sampling moment and the parameter data of the battery pack at the start sampling moment. The present disclosure imposes no limitation on this.

[83] It can be understood that, when the difference value is a difference, the difference data of the total voltage of the battery pack comprises a total voltage difference of the battery pack; and 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.

[84] S250: determining whether the high-voltage main circuit satisfies the fusing condition based on the difference data of the parameter data of the battery pack.

[85] Details of determining whether the high-voltage main circuit satisfies the fusing condition based on the current of the high-voltage main circuit and a preset threshold when the current of the high-voltage main circuit does not exceed the upper limit of the first measurement range will be described below.

[86] As a first example, it is determined whether the current of the high-voltage main circuit is greater than a first preset threshold and whether a time for which the current of the high-voltage main circuit is greater than the first preset threshold reaches a first preset time; if yes, it is determined that the high-voltage main circuit satisfies the fusing condition.

[87] As a second example, it is determined whether the current of the high-voltage main circuit is greater than a second preset threshold and whether a time for which the current of the high-voltage main circuit is greater than the second preset threshold reaches a second preset time; if yes, it is determined that the high-voltage main circuit satisfies the fusing condition.

[88] Here, the first preset threshold is less than the second preset threshold, the second preset threshold is less than the upper limit of the first measurement range, and the first preset time is greater than the second preset time.

[89] As an example, when the current sensor further comprises a second current sensor on a basis of comprising the first current sensor (that is, when the current sensor comprises two current sensors), assuming that a measurement range of the second current sensor is a second measurement range, and an upper limit of the second measurement range is less than the upper limit of the first measurement range, then the first preset threshold and the second preset threshold may be configured as follows: the first preset threshold is less than the upper limit of the second measurement range, and the second preset threshold is greater than the upper limit of the second measurement range and less than the upper limit of the first measurement range.

[90] By the above manner, when the current of the high-voltage main circuit does not exceed the upper limit of the first measurement range, whether the high-voltage main circuit satisfies the fusing condition may be determined based on the current of the high-voltage main circuit.

[91] Details of determining whether the high-voltage main circuit satisfies the fusing condition based on the difference data of the parameter data of the battery pack when the current of the high-voltage main circuit exceeds the upper limit of the first measurement range will be described below.

[92] As a third example, it is determined whether a time for which the current of the high-voltage main circuit exceeds the upper limit of the first measurement range reaches a third preset time; if yes, it is determined that the high-voltage main circuit satisfies the fusing condition;

[93] As a fourth example, the parameter data of the battery pack comprises the total voltage of the battery pack, and the difference data of the total voltage of the battery pack comprises the total voltage difference of the battery pack. In this case, steps of determining whether the high-voltage main circuit satisfies the fusing condition based on the difference data of the parameter data of the battery pack may comprise: determining whether the total voltage difference is greater than a third preset threshold and whether a time for which the total voltage difference is greater than the third preset threshold reaches a fourth preset time; if yes, it is determined that the high-voltage main circuit satisfies the fusing condition.

[94] Here, the current in the high-voltage main circuit is directly proportional to the total voltage difference. When the current in the high-voltage main circuit is greater, the total voltage difference is greater; when the current in the high-voltage main circuit is smaller, the total voltage difference is smaller. Therefore, it can be understood that, assuming that the upper limit of the first measurement range is 2000A, the total voltage differences when the current in the high-voltage main circuit reaches 2500A and reaches 3000A are different, and when the current in the high-voltage main circuit reaches 3000A, the total voltage difference is greater. Therefore, by setting the third preset threshold, the current condition in the high-voltage main circuit may be determined; that is, a moment at which the total voltage difference is greater than the third preset threshold indicates that the current in the high-voltage main circuit has reached a certain value, for example, has reached 3000A.

[95] As a fifth example, the parameter data of the battery pack comprises the minimum cell voltage of the battery cells in the battery pack, and the difference data of the minimum cell voltage of the battery cells in the battery pack comprises the cell voltage difference of the minimum cell voltage. In this case, steps of determining whether the high-voltage main circuit satisfies the fusing condition based on the difference data of the parameter data of the battery pack may comprise: determining whether the cell voltage difference of the minimum cell voltage is greater than a fourth preset threshold and whether a time for which the cell voltage difference of the minimum cell voltage is greater than the fourth preset threshold reaches a fifth preset time; if yes, it is determined that the high-voltage main circuit satisfies the fusing condition.

[96] Here, the third preset threshold is greater than the upper limit of the first measurement range, and the fourth preset threshold is greater than the third preset threshold; the third preset time is greater than the fourth preset time, and the fourth preset time is greater than or equal to the fifth preset time.

[97] Here, the current in the high-voltage main circuit is directly proportional to the cell voltage difference of the minimum cell voltage. When the current in the high-voltage main circuit is greater, the cell voltage difference of the minimum cell voltage is greater; when the current in the high-voltage main circuit is smaller, the cell voltage difference of the minimum cell voltage is smaller. Therefore, it can be understood that, assuming that the upper limit of the first measurement range is 2000A, the cell voltage differences of the minimum cell voltage when the current in the high-voltage main circuit reaches 2700A and reaches 3500A are different, and when the current in the high-voltage main circuit reaches 3500A, the cell voltage difference of the minimum cell voltage is greater. Therefore, by setting the fourth preset threshold, the current condition in the high-voltage main circuit may be determined; that is, a moment at which the cell voltage difference of the minimum cell voltage is greater than the fourth preset threshold indicates that the current in the high-voltage main circuit has reached a certain value, for example, has reached 3500A.

[98] It can be understood that the solution of the present disclosure may comprise at least one of conditions corresponding to the above five examples.

[99] Steps of controlling the fuse to be disconnected when the solution of the present disclosure comprises all of the conditions corresponding to the above five examples will be described below. Steps of controlling the fuse to be disconnected when the solution of the present disclosure comprises one or more of the conditions corresponding to any of the above five examples may refer to the steps of this example.

[100] Please refer to FIG. 3. FIG. 3 shows a schematic flowchart of steps of controlling a fuse to be disconnected provided by an exemplary embodiment of the present disclosure. Wherein, conditions of the determining whether the high-voltage main circuit satisfies the fusing condition based on the difference data of the parameter data of the battery pack comprise all of the conditions corresponding to the above five examples.

[101] As shown in FIG. 3, the steps of controlling the fuse to be disconnected may comprise: at step S100, acquiring the current of the high-voltage main circuit by means of the current sensor, and then at step S210, determining whether the current of the high-voltage main circuit exceeds the upper limit of the first measurement range. On one hand, if the current of the high-voltage main circuit does not exceed the upper limit of the first measurement range, then at step S221, it is determined whether the current of the high-voltage main circuit is greater than the first preset threshold and whether the time for which the current of the high-voltage main circuit is greater than the first preset threshold reaches the first preset time; if yes, it is directly determined that the high-voltage main circuit satisfies the fusing condition, and at step S300, the fuse is controlled to be disconnected; if no, then at step S222, it is determined whether the current of the high-voltage main circuit is greater than the second preset threshold and whether the time for which the current of the high-voltage main circuit is greater than the second preset threshold reaches the second preset time; if yes, it is directly determined that the high-voltage main circuit satisfies the fusing condition, and at step S300, the fuse is controlled to be disconnected; if no, the process returns to step S210 to determine whether the current of the high-voltage main circuit exceeds the upper limit of the first measurement range. On the other hand, if the current of the high-voltage main circuit exceeds the upper limit of the first measurement range, then at step S230, a moment at which the current of the high-voltage main circuit exceeds the upper limit of the first measurement range is used as the start sampling moment, and parameter data of the battery pack at the start sampling moment and parameter data of the battery pack at each sampling moment after the start sampling moment are acquired; then at step S240, for each sampling moment, a difference value between the parameter data of the battery pack at the sampling moment and the parameter data of the battery pack at the start sampling moment is determined, and the difference value is used as difference data of the parameter data of the battery pack at the sampling moment; then at step S251, it is determined whether the time for which the current of the high-voltage main circuit exceeds the upper limit of the first measurement range reaches the third preset time; if yes, it is directly determined that the high-voltage main circuit satisfies the fusing condition; if no, then at step S252, it is determined whether the total voltage difference is greater than the third preset threshold and whether the time for which the total voltage difference is greater than the third preset threshold reaches the fourth preset time; if yes, it is directly determined that the high-voltage main circuit satisfies the fusing condition; if no, then at step S253, it is determined whether the cell voltage difference of the minimum cell voltage is greater than the fourth preset threshold and whether the time for which the cell voltage difference of the minimum cell voltage is greater than the fourth preset threshold reaches the fifth preset time; if yes, it is directly determined that the high-voltage main circuit satisfies the fusing condition; if no, the process returns to step S210 to determine whether the current of the high-voltage main circuit exceeds the upper limit of the first measurement range.

[102] In summary, the power battery fuse control method provided by the embodiments of the present disclosure can directly control the fuse to be disconnected based on the current of the high-voltage main circuit according to a predetermined strategy. The fuse no longer needs to accumulate heat and fuse only when the heat accumulation reaches a certain value. A time for directly controlling the fuse to be disconnected is shorter (generally at a millisecond level); therefore, the disconnection time of the high-voltage main circuit is shortened, and the fusing efficiency of the high-voltage main circuit is improved. In addition, in the process of directly controlling the fuse to be disconnected according to the predetermined strategy, when the current in the high-voltage main circuit is greater, a shorter preset time is set. In this manner, when the current is greater, a requirement for determining that the high-voltage main circuit satisfies the fusing condition can be reduced, further shortening the disconnection time of the high-voltage main circuit and improving the fusing efficiency of the high-voltage main circuit.

[103] Based on the same inventive concept, embodiments of the present disclosure further provide a power battery fuse control apparatus corresponding to the above-described power battery fuse control method. Since the principle by which the apparatus in the embodiments of the present disclosure solves the problem is similar to the principle by which the method in the embodiments of the present disclosure solves the problem, implementation of the apparatus may refer to implementation of the method, and repeated details will not be described.

[104] Please refer to FIG. 4. FIG. 4 shows a structural schematic diagram of a power battery fuse control apparatus provided by an exemplary embodiment of the present disclosure.

[105] As shown in FIG. 4, the control apparatus comprises:

[106] an acquisition module 410, configured to acquire a current of the high-voltage main circuit by means of the current sensor;

[107] a determination module 420, configured to determine whether the high-voltage main circuit satisfies a fusing condition based on the current of the high-voltage main circuit; and

[108] a control module 430, configured to: if the high-voltage main circuit satisfies the fusing condition, control the fuse to be disconnected.

[109] Optionally, the current sensor comprises a first current sensor, and a measurement range of the first current sensor is a first measurement range. The determination module 420 is specifically configured to:

[110] determine whether the current of the high-voltage main circuit exceeds an upper limit of the first measurement range; and

[111] if the current of the high-voltage main circuit does not exceed the upper limit of the first measurement range, determine whether the high-voltage main circuit satisfies the fusing condition based on the current of the high-voltage main circuit and a preset threshold.

[112] Optionally, the determination module 420 is specifically configured to:

[113] determine whether the current of the high-voltage main circuit is greater than a first preset threshold and whether a time for which the current of the high-voltage main circuit is greater than the first preset threshold reaches a first preset time;

[114] if yes, determine that the high-voltage main circuit satisfies the fusing condition;

[115] and / or;

[116] determine whether the current of the high-voltage main circuit is greater than a second preset threshold and whether a time for which the current of the high-voltage main circuit is greater than the second preset threshold reaches a second preset time;

[117] if yes, determine that the high-voltage main circuit satisfies the fusing condition;

[118] wherein the first preset threshold is less than the second preset threshold, the second preset threshold is less than the upper limit of the first measurement range, and the first preset time is greater than the second preset time.

[119] Optionally, the determination module 420 is specifically configured to:

[120] if the current of the high-voltage main circuit exceeds the upper limit of the first measurement range, use a moment at which the current of the high-voltage main circuit exceeds the upper limit of the first measurement range as a start sampling moment;

[121] acquire parameter data of the battery pack at the start sampling moment and parameter data of the battery pack at each sampling moment after the start sampling moment;

[122] for each sampling moment, determine a difference value between the parameter data of the battery pack at the sampling moment and the parameter data of the battery pack at the start sampling moment, and use the difference value as difference data of the parameter data of the battery pack at the sampling moment; and

[123] determine whether the high-voltage main circuit satisfies the fusing condition based on the difference data of the parameter data of the battery pack.

[124] Optionally, the parameter data of the battery pack comprises at least one of the following items: a total voltage of the battery pack and a minimum cell voltage of battery cells in the battery pack; the difference data of the total voltage of the battery pack comprises a total voltage difference of the battery pack; and 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.

[125] Optionally, the determination module 420 is specifically configured to:

[126] determine whether a time for which the current of the high-voltage main circuit exceeds the upper limit of the first measurement range reaches a third preset time;

[127] if yes, determine that the high-voltage main circuit satisfies the fusing condition;

[128] and / or;

[129] wherein the parameter data of the battery pack comprises the total voltage of the battery pack, and the difference data of the total voltage of the battery pack comprises the total voltage difference of the battery pack;

[130] determine whether the total voltage difference is greater than a third preset threshold and whether a time for which the total voltage difference is greater than the third preset threshold reaches a fourth preset time;

[131] if yes, determine that the high-voltage main circuit satisfies the fusing condition;

[132] and / or;

[133] wherein the parameter data of the battery pack comprises the minimum cell voltage of the battery cells in the battery pack, and the difference data of the minimum cell voltage of the battery cells in the battery pack comprises the cell voltage difference of the minimum cell voltage;

[134] determine whether the cell voltage difference of the minimum cell voltage is greater than a fourth preset threshold and whether a time for which the cell voltage difference of the minimum cell voltage is greater than the fourth preset threshold reaches a fifth preset time;

[135] if yes, determine that the high-voltage main circuit satisfies the fusing condition;

[136] wherein the third preset threshold is greater than the upper limit of the first measurement range, and the fourth preset threshold is greater than the third preset threshold; the third preset time is greater than the fourth preset time, and the fourth preset time is greater than or equal to the fifth preset time.

[137] Optionally, the current sensor further comprises a second current sensor, and a measurement range of the second current sensor is a second measurement range; an upper limit of the second measurement range is less than the upper limit of the first measurement range;

[138] the first preset threshold is less than the upper limit of the second measurement range, and the second preset threshold is greater than the upper limit of the second measurement range and less than the upper limit of the first measurement range.

[139] The control apparatus provided by the embodiments of the present disclosure acquires the current of the high-voltage main circuit by means of the current sensor; determines whether the high-voltage main circuit satisfies a fusing condition based on the current of the high-voltage main circuit; and if the high-voltage main circuit satisfies the fusing condition, controls the fuse to be disconnected. Based on the current of the high-voltage main circuit, the fuse is directly controlled to be disconnected according to a predetermined strategy. Compared with a fuse that needs to fuse only when heat accumulation reaches a certain value, a time for directly controlling the fuse to be disconnected is shorter (generally at a millisecond level); therefore, the disconnection time of the high-voltage main circuit is shortened, and the fusing efficiency of the high-voltage main circuit is improved.

[140] Please refer to FIG. 5. FIG. 5 is a structural schematic diagram of a vehicle provided by an embodiment of the present disclosure. As shown in FIG. 5, the vehicle 500 comprises a processor 510, a memory 520, and a bus 530.

[141] The memory 520 stores machine-readable instructions executable by the processor 510. When an electronic device 500 runs, the processor 510 communicates with the memory 520 via the bus 530. When the machine-readable instructions are executed by the processor 510, steps of the power battery fuse control method in the above-described method embodiments may be executed. Specific implementation manners may be found in the method embodiments, and details will not be repeated here.

[142] Embodiments of the present disclosure further provide a computer-readable storage medium. A computer program is stored on the computer-readable storage medium, and when the computer program is run by a processor, steps of the power battery fuse control method in the above-described method embodiments may be executed. Specific implementation manners may be found in the method embodiments, and details will not be repeated here.

[143] A person skilled in the art may clearly understand that, for convenience and brevity of description, specific working processes of the above-described system, apparatus, and unit may refer to corresponding processes in the above-described method embodiments, and details will not be repeated here.

[144] In the several embodiments provided in the present disclosure, it should be understood that the disclosed system, apparatus, and method 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. In addition, a plurality of units or components may be combined or integrated into another system, or some features may be ignored or not executed. In addition, coupling or direct coupling or communication connection between displayed or discussed components may be indirect coupling or communication connection via some communication interfaces, apparatuses, or units, and may be in electrical, mechanical, or other forms.

[145] The units described as separate components may or may not be physically separate, and components displayed as units may or may not be physical units; that is, they may be located in one place, or may be distributed over a plurality of network units. Some or all of the units may be selected according to actual needs to achieve the objectives of the solutions of the embodiments.

[146] In addition, in the embodiments of the present disclosure, functional units may be integrated into one processing unit, or each unit may exist alone physically, or two or more units may be integrated into one unit.

[147] If the functions are implemented in a form of software functional units and sold or used as an independent product, they may be stored in a non-volatile computer-readable storage medium executable by a processor. Based on such understanding, the technical solutions of the present disclosure essentially, or a part contributing to the prior art, or a part of the technical solutions may be embodied in a form of a software product. The computer software product is stored in a storage medium, and comprises several instructions for causing a computer device (which may be a personal computer, a server, or a network device, and so on) to execute all or some of the steps of the methods in the embodiments of the present disclosure. The above-described storage medium comprises: a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk, an optical disk, and various other media capable of storing program codes.

[148] Finally, it should be noted that: the above embodiments are merely intended to describe the technical solutions of the present disclosure, rather than to limit the present disclosure. Although the present disclosure is described in detail with reference to the foregoing embodiments, a person of ordinary skill in the art should understand that: the technical solutions described in the foregoing embodiments may still be modified, or some of the technical features may be equivalently replaced; these modifications or replacements do not cause the essence of corresponding technical solutions to depart from the spirit and scope of the technical solutions of the embodiments of the present disclosure, and should all be encompassed within the protection scope of the present disclosure. Therefore, the protection scope of the present disclosure shall be subject to the protection scope of the claims. INDUSTRIAL APPLICABILITY

[149] By adopting the above solution, based on a current of a high-voltage main circuit, a fuse is directly controlled to be disconnected according to a predetermined strategy. The fuse no longer needs to accumulate heat and fuse only when the heat accumulation reaches a certain value. A time for directly controlling the fuse to be disconnected is shorter (generally at a millisecond level); therefore, the disconnection time of the high-voltage main circuit is shortened, and the fusing efficiency of the high-voltage main circuit is improved. CLAIMS1. A power battery fuse control method, being applied to a BMS in a power battery system, the power battery system comprising: a fuse and a current sensor provided on a high-voltage main circuit in the power battery system; the control method comprising:acquiring a current of the high-voltage main circuit by means of the current sensor;determining whether the high-voltage main circuit satisfies a fusing condition based on the current of the high-voltage main circuit; andif the high-voltage main circuit satisfies the fusing condition, controlling the fuse to be disconnected.2. The control method of claim 1, wherein the current sensor comprises a first current sensor, and a measurement range of the first current sensor is a first measurement range; the determining whether the high-voltage main circuit satisfies a fusing condition based on the current of the high-voltage main circuit comprises:determining whether the current of the high-voltage main circuit exceeds an upper limit of the first measurement range; andif the current of the high-voltage main circuit does not exceed the upper limit of the first measurement range, determining whether the high-voltage main circuit satisfies the fusing condition based on the current of the high-voltage main circuit and a preset threshold.3. The control method of claim 2, wherein the determining whether the high-voltage main circuit satisfies the fusing condition based on the current of the high-voltage main circuit and a preset threshold comprises:determining whether the current of the high-voltage main circuit is greater than a first preset threshold and whether a time for which the current of the high-voltage main circuit is greater than the first preset threshold reaches a first preset time;if yes, determining that the high-voltage main circuit satisfies the fusing condition;and / or;determining whether the current of the high-voltage main circuit is greater than a second preset threshold and whether a time for which the current of the high-voltage main circuit is greater than the second preset threshold reaches a second preset time;if yes, determining that the high-voltage main circuit satisfies the fusing condition;wherein the first preset threshold is less than the second preset threshold, the second preset threshold is less than the upper limit of the first measurement range, and the first preset time is greater than the second preset time.4. The control method of claim 2, wherein the control method further comprises:if the current of the high-voltage main circuit exceeds the upper limit of the first measurement range, using a moment at which the current of the high-voltage main circuit exceeds the upper limit of the first measurement range as a start sampling moment, and acquiring parameter data of a battery pack at the start sampling moment and parameter data of the battery pack at each sampling moment after the start sampling moment;for each sampling moment, determining a difference value between the parameter data of the battery pack at the sampling moment and the parameter data of the battery pack at the start sampling moment, and using the difference value as difference data of the parameter data of the battery pack at the sampling moment; anddetermining whether the high-voltage main circuit satisfies the fusing condition based on the difference data of the parameter data of the battery pack.5. The control method of claim 4, wherein the parameter data of the battery pack comprises at least one of the following items: a total voltage of the battery pack and a minimum cell voltage of battery cells in the battery pack; the difference data of the total voltage of the battery pack comprises a total voltage difference of the battery pack; and 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.6. The control method of claim 5, wherein the determining whether the high-voltage main circuit satisfies the fusing condition based on the difference data of the parameter data of the battery pack comprises:determining whether a time for which the current of the high-voltage main circuit exceeds the upper limit of the first measurement range reaches a third preset time;if yes, determining that the high-voltage main circuit satisfies the fusing condition;and / or;wherein the parameter data of the battery pack comprises the total voltage of the battery pack, and 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 for which the total voltage difference is greater than the third preset threshold reaches a fourth preset time;if yes, determining that the high-voltage main circuit satisfies the 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, and the difference data of the minimum cell voltage of the battery cells in the battery pack comprises the cell voltage difference of the minimum cell voltage;determining whether the cell voltage difference of the minimum cell voltage is greater than a fourth preset threshold and whether a time for which the cell voltage difference of the minimum cell voltage is greater than the fourth preset threshold reaches a fifth preset time;if yes, determining that the high-voltage main circuit satisfies the fusing condition;wherein the third preset threshold is greater than the upper limit of the first measurement range, and the fourth preset threshold is greater than the third preset threshold; the third preset time is greater than the fourth preset time, and the fourth preset time is greater than or equal to the fifth preset time.7. The control method of claim 3, wherein the current sensor further comprises a second current sensor, and a measurement range of the second current sensor is a second measurement range; an upper limit of the second measurement range is less than the upper limit of the first measurement range;the first preset threshold is less than the upper limit of the second measurement range, and the second preset threshold is greater than the upper limit of the second measurement range and less than the upper limit of the first measurement range.8. A power battery fuse control apparatus, wherein the control apparatus is applied to a BMS in a power battery system, the power battery system comprising: a fuse and a current sensor provided on a high-voltage main circuit in the power battery system; the control apparatus comprising:an acquisition module, configured to acquire a current of the high-voltage main circuit by means of the current sensor;a determination module, configured to determine whether the high-voltage main circuit satisfies a fusing condition based on the current of the high-voltage main circuit; anda control module, configured to: if the high-voltage main circuit satisfies the fusing condition, control the fuse to be disconnected.9. A vehicle, comprising: a processor, a memory, and a bus, the memory storing machine-readable instructions executable by the processor, when an electronic device runs, the processor and the memory communicating with each other via the bus, and the machine-readable instructions, when run by the processor, executing steps of the power battery fuse control method according to any one of claims 1 to 7.10. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and the computer program, when run by a processor, executes steps of the power battery fuse control method according to any one of claims 1 to 7. ABSTRACT A power battery fuse control method, a control apparatus, and a storage medium. The control method is used for a BMS (10) in a power battery system. The power battery system comprises: a fuse (20) and a current sensor (30) provided on a high-voltage main circuit in the power battery system. The control method comprises: by means of the current sensor (30), acquiring a current of the high-voltage main circuit; based on the current of the high-voltage main circuit, determining whether the high-voltage main circuit satisfies a fusing condition; and if the high-voltage main circuit satisfies the fusing condition, controlling the fuse (20) to be disconnected. The control method can shorten a disconnection time of the high-voltage main circuit, and improve fusing efficiency of the high-voltage main circuit.

Claims

1. A power battery fuse control method, being applied to a BMS in a power battery system, the power battery system comprising: a fuse and a current sensor provided on a high-voltage main circuit in the power battery system; the control method comprising:acquiring a current of the high-voltage main circuit by means of the current sensor;determining whether the high-voltage main circuit satisfies a fusing condition based on the current of the high-voltage main circuit; andif the high-voltage main circuit satisfies the fusing condition, controlling the fuse to be disconnected. 2. The control method of claim 1, wherein the current sensor comprises a first current sensor, and a measurement range of the first current sensor is a first measurement range; the determining whether the high-voltage main circuit satisfies a fusing condition based on the current of the high-voltage main circuit comprises:determining whether the current of the high-voltage main circuit exceeds an upper limit of the first measurement range; andif the current of the high-voltage main circuit does not exceed the upper limit of the first measurement range, determining whether the high-voltage main circuit satisfies the fusing condition based on the current of the high-voltage main circuit and a preset threshold. 3. The control method of claim 2, wherein the determining whether the high-voltage main circuit satisfies the fusing condition based on the current of the high-voltage main circuit and a preset threshold comprises:determining whether the current of the high-voltage main circuit is greater than a first preset threshold and whether a time for which the current of the high-voltage main circuit is greater than the first preset threshold reaches a first preset time;if yes, determining that the high-voltage main circuit satisfies the fusing condition;and / or;determining whether the current of the high-voltage main circuit is greater than a second preset threshold and whether a time for which the current of the high-voltage main circuit is greater than the second preset threshold reaches a second preset time;if yes, determining that the high-voltage main circuit satisfies the fusing condition;wherein the first preset threshold is less than the second preset threshold, the second preset threshold is less than the upper limit of the first measurement range, and the first preset time is greater than the second preset time. 4. The control method of claim 2, wherein the control method further comprises:if the current of the high-voltage main circuit exceeds the upper limit of the first measurement range, using a moment at which the current of the high-voltage main circuit exceeds the upper limit of the first measurement range as a start sampling moment, and acquiring parameter data of a battery pack at the start sampling moment and parameter data of the battery pack at each sampling moment after the start sampling moment;for each sampling moment, determining a difference value between the parameter data of the battery pack at the sampling moment and the parameter data of the battery pack at the start sampling moment, and using the difference value as difference data of the parameter data of the battery pack at the sampling moment; anddetermining whether the high-voltage main circuit satisfies the fusing condition based on the difference data of the parameter data of the battery pack. 5. The control method of claim 4, wherein the parameter data of the battery pack comprises at least one of the following items: a total voltage of the battery pack and a minimum cell voltage of battery cells in the battery pack; the difference data of the total voltage of the battery pack comprises a total voltage difference of the battery pack; and 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. 6. The control method of claim 5, wherein the determining whether the high-voltage main circuit satisfies the fusing condition based on the difference data of the parameter data of the battery pack comprises:determining whether a time for which the current of the high-voltage main circuit exceeds the upper limit of the first measurement range reaches a third preset time;if yes, determining that the high-voltage main circuit satisfies the fusing condition;and / or;wherein the parameter data of the battery pack comprises the total voltage of the battery pack, and 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 for which the total voltage difference is greater than the third preset threshold reaches a fourth preset time;if yes, determining that the high-voltage main circuit satisfies the 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, and the difference data of the minimum cell voltage of the battery cells in the battery pack comprises the cell voltage difference of the minimum cell voltage;determining whether the cell voltage difference of the minimum cell voltage is greater than a fourth preset threshold and whether a time for which the cell voltage difference of the minimum cell voltage is greater than the fourth preset threshold reaches a fifth preset time;if yes, determining that the high-voltage main circuit satisfies the fusing condition;wherein the third preset threshold is greater than the upper limit of the first measurement range, and the fourth preset threshold is greater than the third preset threshold; the third preset time is greater than the fourth preset time, and the fourth preset time is greater than or equal to the fifth preset time. 7. The control method of claim 3, wherein the current sensor further comprises a second current sensor, and a measurement range of the second current sensor is a second measurement range; an upper limit of the second measurement range is less than the upper limit of the first measurement range;the first preset threshold is less than the upper limit of the second measurement range, and the second preset threshold is greater than the upper limit of the second measurement range and less than the upper limit of the first measurement range. 8. A power battery fuse control apparatus, wherein the control apparatus is applied to a BMS in a power battery system, the power battery system comprising: a fuse and a current sensor provided on a high-voltage main circuit in the power battery system; the control apparatus comprising:an acquisition module, configured to acquire a current of the high-voltage main circuit by means of the current sensor;a determination module, configured to determine whether the high-voltage main circuit satisfies a fusing condition based on the current of the high-voltage main circuit; anda control module, configured to: if the high-voltage main circuit satisfies the fusing condition, control the fuse to be disconnected. 9. A vehicle, comprising: a processor, a memory, and a bus, the memory storing machine-readable instructions executable by the processor, when an electronic device runs, the processor and the memory communicating with each other via the bus, and the machine-readable instructions, when run by the processor, executing steps of the power battery fuse control method according to any one of claims 1 to 7. 10. A computer-readable storage medium, wherein a computer program is stored on the computer-readable storage medium, and the computer program, when run by a processor, executes steps of the power battery fuse control method according to any one of claims 1 to 7. 

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