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

A control method, control device and storage medium for a power battery fuse

[0001] CROSS-REFERENCE TO RELATED APPLICATIONS

[0002] This application claims priority to Chinese patent application number 2023117920039, filed with the Patent Office of China on December 22, 2023, entitled “A control method and control device for a power battery fuse,” the entire contents of which are incorporated by reference into this application. Technical Field

[0003] The present application relates to the technical field of power batteries, and in particular to a control method, a control device, and a storage medium for a power battery fuse. Background Art

[0004] With the development of electric vehicles, electric vehicles are increasingly used in daily life. However, in daily life, electric vehicles often have safety issues, such as short circuit and spontaneous combustion after a collision, short circuit and spontaneous combustion during charging, etc. These safety issues are all caused by the power battery of electric vehicles. Therefore, the safety of the power battery of electric vehicles has become an issue that cannot be ignored.

[0005] Most power batteries use high-voltage relays and fuses to jointly realize the high-voltage cut-off function of the power battery, thereby ensuring the high-voltage safety of the power battery. Among them, the high-voltage relay is an active protection component, which realizes the high-voltage power-off of the power battery through active low-voltage cut-off. However, when the current in the high-voltage circuit reaches a large current (for example, 1500A) relative to the high-voltage relay, there is a risk of relay adhesion when the high-voltage relay is disconnected, and the high-voltage power-off of the power battery cannot be fully guaranteed. In order to ensure the high-voltage power-off of the power battery in this case, a fuse is added. The fuse is a passive protection component. When the above-mentioned current appears in the high-voltage circuit, since the current that is a large current for the high-voltage relay is a small current for the fuse, the fuse will not disconnect immediately, but will accumulate heat. It will only melt when the heat accumulation reaches a certain value.

[0006] Application Contents

[0007] In view of this, the purpose of the present application is to provide a control method, a control device and a storage medium for a power battery fuse, so as to shorten the time when the high-voltage main circuit is disconnected and improve the fusing efficiency of the high-voltage main circuit.

[0008] In a first aspect, an embodiment of the present application provides a method for controlling a power battery fuse, which is applied to a BMS in a power battery system, wherein the power battery system includes: a fuse and a current sensor provided on a high-voltage main circuit in the power battery system; the control method includes:

[0009] Obtaining the current of the high-voltage main circuit through the current sensor;

[0010] Determining whether the high-voltage main circuit has reached a fusing condition based on the current of the high-voltage main circuit;

[0011] If the high-voltage main circuit reaches a fuse condition, the fuse is controlled to disconnect.

[0012] Optionally, the current sensor includes a first current sensor, and the range of the first current sensor is a first range; and determining whether the high-voltage main circuit reaches a fuse condition based on the current of the high-voltage main circuit includes:

[0013] determining whether the current of the high-voltage main circuit exceeds the upper limit of the first measuring range;

[0014] If the current of the high-voltage main circuit does not exceed the upper range limit of the first range, it is determined whether the high-voltage main circuit reaches a fuse condition based on the current of the high-voltage main circuit and a preset threshold.

[0015] Optionally, determining whether the high-voltage main circuit reaches a fuse condition based on the current of the high-voltage main circuit and a preset threshold value includes:

[0016] Determining whether the current of the high-voltage main circuit is greater than a first preset threshold and whether the time during which the current of the high-voltage main circuit is greater than the first preset threshold reaches a first preset time;

[0017] If yes, it is determined that the high voltage main circuit has reached a fuse condition;

[0018] and / or;

[0019] Determining whether the current of the high-voltage main circuit is greater than a second preset threshold and whether the time during which the current of the high-voltage main circuit is greater than the second preset threshold reaches a second preset time;

[0020] If yes, it is determined that the high voltage main circuit has reached a fuse condition;

[0021] The first preset threshold is smaller than the second preset threshold, the second preset threshold is smaller than the upper limit of the first range, and the first preset time is larger than the second preset time.

[0022] Optionally, the control method further includes:

[0023] If the current of the high-voltage main circuit exceeds the upper limit of the first range, the time when the current of the high-voltage main circuit exceeds the upper limit of the first range is used as the starting sampling time;

[0024] Acquire parameter data of the battery pack at the sampling start time and parameter data of the battery pack at each sampling time after the sampling start time;

[0025] For each sampling moment, determining a difference 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 determining the difference as the difference data of the parameter data of the battery pack at the sampling moment;

[0026] Based on the difference data of the parameter data of the battery pack, it is determined whether the high-voltage main circuit reaches a fuse condition.

[0027] Optionally, the parameter data of the battery pack includes at least one of the following items: 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 includes the total voltage difference of the battery pack; the difference data of the minimum cell voltage of the battery cells in the battery pack includes the cell voltage difference of the minimum cell voltage.

[0028] Optionally, the determining whether the high-voltage main circuit reaches a fuse condition based on the difference data of the parameter data of the battery pack includes:

[0029] determining whether the time during which the current of the high-voltage main circuit exceeds the upper limit of the first range reaches a third preset time;

[0030] If yes, it is determined that the high voltage main circuit has reached a fuse condition;

[0031] and / or;

[0032] The parameter data of the battery pack includes the total voltage of the battery pack; the difference data of the total voltage of the battery pack includes the total voltage difference of the battery pack;

[0033] determining whether the total voltage difference is greater than a third preset threshold and whether the time for which the total voltage difference is greater than the third preset threshold reaches a fourth preset time;

[0034] If yes, it is determined that the high voltage main circuit has reached a fuse condition;

[0035] and / or;

[0036] The parameter data of the battery pack includes 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 includes the cell voltage difference of the minimum cell voltage.

[0037] determining whether the minimum cell voltage difference is greater than a fourth preset threshold and whether the time for which the minimum cell voltage difference is greater than the fourth preset threshold reaches a fifth preset time;

[0038] If yes, it is determined that the high voltage main circuit has reached a fuse condition;

[0039] Among them, the third preset threshold is greater than the upper limit of the first range, the fourth preset threshold is greater than the third preset threshold; the third preset time is greater than the fourth preset time; the fourth preset time is greater than or equal to the fifth preset time.

[0040] Optionally, the current sensor further includes a second current sensor, 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;

[0041] 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.

[0042] In a second aspect, an embodiment of the present application provides a control device for a power battery fuse, the control device being applied to 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 device comprising:

[0043] an acquisition module, configured to acquire the current of the high-voltage main circuit through the current sensor;

[0044] a judgment module configured to determine whether the high-voltage main circuit reaches a fuse condition based on the current of the high-voltage main circuit;

[0045] The control module is configured to control the fuse to open if the high-voltage main circuit reaches a fuse condition.

[0046] In a third aspect, an embodiment of the present application provides a vehicle comprising: 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 communicate through the bus, and when the machine-readable instructions are executed by the processor, the steps of the power battery fuse control method as described above are performed.

[0047] In a fourth aspect, an embodiment of the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor, the steps of the power battery fuse control method as described above are executed. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without creative work.

[0049] FIG1 shows a schematic structural diagram of a power battery system provided by an exemplary embodiment of the present application;

[0050] FIG2 shows a flow chart of a method for controlling a power battery fuse provided by an exemplary embodiment of the present application;

[0051] FIG3 shows a schematic flow chart of steps for controlling fuse disconnection provided by an exemplary embodiment of the present application;

[0052] FIG4 shows a schematic structural diagram of a control device for a power battery fuse provided by an exemplary embodiment of the present application;

[0053] FIG5 shows a schematic structural diagram of a vehicle provided by an exemplary embodiment of the present application. DETAILED DESCRIPTION

[0054] In order to make the purpose, technical solutions and advantages of the embodiments of the present application clearer, the technical solutions in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all of the embodiments. The components of the embodiments of the present application generally described and shown in the drawings here can be arranged and designed in various different configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application for which protection is claimed, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, each other embodiment obtained by those skilled in the art without making creative work falls within the scope of protection of the present application.

[0055] With the development of electric vehicles, electric vehicles are increasingly used in daily life. However, in daily life, electric vehicles often have safety issues, such as short circuit and spontaneous combustion after a collision, short circuit and spontaneous combustion during charging, etc. These safety issues are all caused by the power battery of electric vehicles. Therefore, the safety of the power battery of electric vehicles has become an issue that cannot be ignored.

[0056] Most power batteries use high-voltage relays and fuses to jointly realize the high-voltage cut-off function of the power battery, thereby ensuring the high-voltage safety of the power battery. Among them, the high-voltage relay is an active protection component, which realizes the high-voltage power-off of the power battery through active low-voltage cut-off. However, when the current in the high-voltage circuit reaches a large current (for example, 1500A) relative to the high-voltage relay, there is a risk of relay adhesion when the high-voltage relay is disconnected, and the high-voltage power-off of the power battery cannot be fully guaranteed. In order to ensure the high-voltage power-off of the power battery in this case, a fuse is added. The fuse is a passive protection component. When the above-mentioned current appears in the high-voltage circuit, since the current that is a large current for the high-voltage relay is a small current for the fuse, the fuse will not disconnect immediately, but will accumulate heat. It will only melt when the heat accumulation reaches a certain value.

[0057] Based on this, an embodiment of the present application provides a control method for a power battery fuse. The control method directly controls the fuse to disconnect based on the current of the high-voltage main circuit according to a predetermined strategy. The fuse no longer needs to accumulate heat and will only blow when the heat accumulation reaches a certain value. The time for controlling the fuse to disconnect directly is shorter (generally in milliseconds), thereby shortening the time for the high-voltage main circuit to be disconnected and improving the fusing efficiency of the high-voltage main circuit.

[0058] For ease of understanding, a power battery system provided by an exemplary embodiment of the present application will first be introduced.

[0059] Please refer to FIG1 , which shows a schematic structural diagram of a power battery system provided by an exemplary embodiment of the present application.

[0060] As shown in FIG1 , in an exemplary embodiment of the present application, the power battery system includes: a BMS 10 , a fuse 20 and a current sensor 30 provided on a high-voltage main circuit in the power battery system.

[0061] Here, the number of the current sensor 10 is at least one. Here, when the number of the current sensors is multiple, the types of the current sensors can be different. As an example, the types of the current sensors can include a shunt current sensor Shunt and a Hall current sensor Hall. Here, by setting up multiple current sensors, a backup function can be played, so that in the event of a current sensor failure, the high-voltage main circuit can be disconnected through another current sensor, thereby ensuring the safety of the high-voltage main circuit. In addition, by setting the types of the multiple current sensors to different types, it can be avoided that when one current sensor fails due to one reason, the other current sensors also fail due to the same reason, thereby further ensuring the safety of the high-voltage main circuit.

[0062] The power battery system further includes a high-voltage relay (including a main positive relay, a pre-charge relay and a main negative relay) and a pre-charge resistor. The high-voltage relay is arranged on the high-voltage circuit of the power battery system.

[0063] In addition, as shown in FIG1 , in addition, 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. For example, the first voltage sampler may be an HMV.

[0064] In addition, as shown in FIG1 , in another exemplary embodiment of the present application, the power battery system may further include a second voltage sampler 50 , wherein the second voltage sampler 50 is used to collect the cell voltage of each battery cell in the battery pack. For example, the second voltage sampler may be a CMU.

[0065] When the power battery system includes 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.

[0066] Next, a control method for a power battery fuse provided by an exemplary embodiment of the present application will be introduced. The control method is applied to the BMS in the above-mentioned power battery system.

[0067] Please refer to FIG. 2 , which shows a flow chart of a method for controlling a power battery fuse provided by an exemplary embodiment of the present application.

[0068] As shown in FIG2 , the control method includes:

[0069] S100, obtaining the current of the high-voltage main circuit through the current sensor;

[0070] Here, when there is one current sensor (a first current sensor), the current of the high-voltage main circuit is obtained through the first current sensor. When there are multiple current sensors, for example, two (a first current sensor and a 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 theoretically be the same. Therefore, the current of the high-voltage main circuit can be obtained through the first current sensor or the second current sensor. Acquiring the current of the high-voltage main circuit through the first current sensor or the second current sensor can be understood as presetting whether to obtain the current of the high-voltage main circuit through the first current sensor or the second current sensor. If the current of the high-voltage main circuit is pre-set to be obtained through 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 the current of the high-voltage main circuit is pre-set to be obtained through 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.

[0071] S200: Determine whether the high-voltage main circuit meets a fuse condition based on the current of the high-voltage main circuit;

[0072] S300: If the high-voltage main circuit reaches a fuse condition, control the fuse to disconnect.

[0073] The control method provided in the embodiment of the present application obtains the current of the high-voltage main circuit through the current sensor; determines whether the high-voltage main circuit has reached a melting condition based on the current of the high-voltage main circuit; and controls the fuse to disconnect if the high-voltage main circuit has reached a melting condition. Based on the current of the high-voltage main circuit, the fuse is directly controlled to disconnect according to a predetermined strategy. The fuse no longer needs to accumulate heat and will only blow when the heat accumulation reaches a certain value. The time required to directly control the fuse to disconnect is shorter (generally in milliseconds), thereby shortening the time it takes for the high-voltage main circuit to be disconnected and improving the fusing efficiency of the high-voltage main circuit.

[0074] The specific implementation of step S200, determining whether the high-voltage main circuit meets the fusing condition based on the current of the high-voltage main circuit, will be described in detail below.

[0075] As an example, the current sensor includes a first current sensor, and the measuring range of the first current sensor is a first measuring range.

[0076] In one embodiment, when the current sensor includes a first current sensor, step S200, determining whether the high-voltage main circuit reaches a fuse condition based on the current of the high-voltage main circuit, may include the following steps:

[0077] S210, determining whether the current of the high-voltage main circuit exceeds the upper limit of the first measuring range;

[0078] S220: If the current of the high-voltage main circuit does not exceed the upper limit of the first measuring range, determine whether the high-voltage main circuit meets the fusing condition based on the current of the high-voltage main circuit and a preset threshold.

[0079] In addition, when the current of the high-voltage main circuit exceeds the upper limit of the first 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 has reached the fuse condition based on the current of the high-voltage main circuit. In order to solve this problem, an embodiment of the present application provides a method for determining whether the high-voltage main circuit has reached the fuse condition when the current of the high-voltage main circuit exceeds the upper limit of the first range.

[0080] In another embodiment, when the current sensor includes a first current sensor, step S200, determining whether the high-voltage main circuit reaches a fuse condition based on the current of the high-voltage main circuit, may additionally include the following steps:

[0081] S230: If the current of the high-voltage main circuit exceeds the upper range limit of the first measurement range, taking the time when the current of the high-voltage main circuit exceeds the upper range limit of the first measurement range as the start sampling time; acquiring parameter data of the battery pack at the start sampling time and parameter data of the battery pack at each sampling time after the start sampling time;

[0082] S240: For each sampling moment, determine a difference 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 determine the difference as the difference data of the parameter data of the battery pack at the sampling moment;

[0083] As an example, the parameter data of the battery pack may include at least one of the following items: the total voltage of the battery pack and the minimum cell voltage of the battery cells in the battery pack;

[0084] Here, the difference value may include a difference value, or may include other values ​​that can reflect the 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, and this application does not impose any limitation on this.

[0085] It can be understood that when 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 voltage of the battery cells in the battery pack includes the cell voltage difference of the minimum cell voltage.

[0086] S250: Determine whether the high-voltage main circuit meets a fuse condition based on difference data of the parameter data of the battery pack.

[0087] Next, the steps of determining whether the high-voltage main circuit meets the fuse condition based on the current of the high-voltage main circuit and a preset threshold value will be introduced when the current of the high-voltage main circuit does not exceed the upper limit of the first range.

[0088] As a first example, determine whether the current of the high-voltage main circuit is greater than a first preset threshold and whether the time during which the current of the high-voltage main circuit is greater than the first preset threshold reaches a first preset time; if so, determine that the high-voltage main circuit reaches a fuse condition.

[0089] As a second example, determine whether the current of the high-voltage main circuit is greater than a second preset threshold and whether the time when the current of the high-voltage main circuit is greater than the second preset threshold reaches a second preset time; if so, determine that the high-voltage main circuit reaches a fuse condition.

[0090] Here, the first preset threshold is smaller than the second preset threshold, the second preset threshold is smaller than the upper limit of the first range, and the first preset time is larger than the second preset time.

[0091] As an example, in the case where the current sensor includes a second current sensor in addition to the first current sensor (that is, the current sensor includes two), assuming that the range of the second current sensor is the second range; the upper range limit of the second range is smaller than the upper range limit of the first range; then the first preset threshold and the second preset threshold can 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 greater than the upper range limit of the second range and smaller than the upper range limit of the first range.

[0092] In this way, when the current of the high-voltage main circuit does not exceed the upper limit of the first range, it can be determined whether the high-voltage main circuit reaches the fuse condition based on the current of the high-voltage main circuit.

[0093] Next, the steps of determining whether the high-voltage main circuit has reached a fuse condition based on 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 range will be introduced.

[0094] As a third example, determining whether the time during which the current of the high-voltage main circuit exceeds the upper limit of the first range reaches a third preset time; if so, determining that the high-voltage main circuit reaches a fuse condition;

[0095] As a fourth example, the parameter data of the battery pack includes the total voltage of the battery pack; the difference data of the total voltage of the battery pack includes the total voltage difference of the battery pack; in this case, the step of determining whether the high-voltage main circuit has reached the fuse condition based on the difference data of the parameter data of the battery pack may include: determining whether the total voltage difference is greater than a third preset threshold and whether the time when the total voltage difference is greater than the third preset threshold reaches a fourth preset time; if so, determining that the high-voltage main circuit has reached the fuse condition.

[0096] Here, the current in the high-voltage main circuit is proportional to the total voltage difference. When the current in the high-voltage main circuit is larger, the total voltage difference is larger; 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 range is 2000A, the total voltage difference is different when the current in the high-voltage main circuit reaches 2500A and when it reaches 3000A. The total voltage difference is larger when the current in the high-voltage main circuit reaches 3000A. Therefore, by setting a third preset threshold, the current situation in the high-voltage main circuit can be determined. That is, when the total voltage difference is greater than the third preset threshold, it indicates that the current in the high-voltage main circuit has reached a certain value, for example, 3000A.

[0097] As a fifth example, the parameter data of the battery pack includes the 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 includes the cell voltage difference of the minimum cell voltage; in this case, with respect to the difference data based on the parameter data of the battery pack, the step of determining whether the high-voltage main circuit has reached the fuse condition may include: determining whether the minimum cell voltage difference is greater than a fourth preset threshold and whether the time when the minimum cell voltage difference is greater than the fourth preset threshold reaches a fifth preset time; if so, determining that the high-voltage main circuit has reached the fuse condition.

[0098] Here, the third preset threshold is greater than the upper limit of the first range, the fourth preset threshold is greater than the third preset threshold; the third preset time is greater than the fourth preset time; the fourth preset time is greater than or equal to the fifth preset time.

[0099] Here, the current in the high-voltage main circuit is proportional to the minimum cell voltage difference. The greater the current in the high-voltage main circuit, the greater the minimum cell voltage difference; and the smaller the current in the high-voltage main circuit, the smaller the minimum cell voltage difference. Therefore, it can be understood that, assuming the upper limit of the first range is 2000A, the minimum cell voltage difference will be different when the current in the high-voltage main circuit reaches 2700A and when it reaches 3500A. The minimum cell voltage difference is greater when the current in the high-voltage main circuit reaches 3500A. Therefore, by setting a fourth preset threshold, the current situation in the high-voltage main circuit can be determined. That is, when the minimum cell voltage difference is greater than the fourth preset threshold, it indicates that the current in the high-voltage main circuit has reached a certain value, for example, 3500A.

[0100] It can be understood that the present application solution may include conditions corresponding to at least one of the conditions corresponding to the above five examples.

[0101] The following describes the steps for controlling the fuse to be disconnected under the conditions corresponding to all five examples described above. The steps for controlling the fuse to be disconnected under the conditions corresponding to any one or more of the five examples described above can refer to the steps of the example.

[0102] Please refer to Figure 3, which shows a schematic flowchart of the steps for controlling fuse opening according to an exemplary embodiment of the present application. The conditions for determining whether the high-voltage main circuit has reached a fuse opening condition based on the difference data of the battery pack parameter data include the conditions corresponding to all five examples described above.

[0103] As shown in FIG3 , the step of controlling the fuse to open may include: in step S100, obtaining the current of the high-voltage main circuit through the current sensor, and then, in step S210, determining 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, then, in step S221, determining whether the current of the high-voltage main circuit is greater than a first preset threshold value and whether the time during which the current of the high-voltage main circuit is greater than the first preset threshold value reaches a first preset time. If so, directly determining that the high-voltage main circuit meets the melting condition, and controlling the fuse to open in step S300; if not, then determining whether the current of the high-voltage main circuit is greater than a second preset threshold value and whether the time during which the current of the high-voltage main circuit is greater than the second preset threshold value reaches a second preset time. If so, directly determining that the high-voltage main circuit meets the melting condition, and controlling the fuse to open in step S300; if not, returning to step S210 to determine whether the current of the high-voltage main circuit exceeds the upper range limit of the first range. On the other hand, if the current of the high-voltage main circuit exceeds the upper limit of the first range, then in step S230, the moment when the current of the high-voltage main circuit exceeds the upper limit of the first range is used as the starting sampling moment, and 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 are obtained; then in step S240, for each sampling moment, the difference value between the parameter data of the battery pack at the sampling moment and the parameter data of the battery pack at the starting sampling moment is determined, and the difference value is determined as the difference data of the parameter data of the battery pack at the sampling moment, and then in step S251, it is determined whether the time when the current of the high-voltage main circuit exceeds the upper limit of the first range reaches The third preset time, if yes, directly determine that the high-voltage main circuit reaches the fuse condition, if not, then in step S252, determine whether the total voltage difference is greater than the third preset threshold and whether the time when the total voltage difference is greater than the third preset threshold reaches the fourth preset time, if yes, directly determine that the high-voltage main circuit reaches the fuse condition, if not, then in step S253, determine whether the minimum single cell voltage difference is greater than the fourth preset threshold and whether the time when the minimum single cell voltage difference is greater than the fourth preset threshold reaches the fifth preset time, if yes, directly determine that the high-voltage main circuit reaches the fuse condition, if not, return to execute step S210, and determine whether the current of the high-voltage main circuit exceeds the upper limit of the first range.

[0104] In summary, the control method of a power battery fuse provided by the embodiment of the present application can directly control the fuse to be disconnected according to a predetermined strategy based on the current of the high-voltage main circuit. The fuse no longer needs to be melted by heat accumulation when the heat accumulation reaches a certain value. The time for controlling the fuse to be directly disconnected is shorter (generally in milliseconds), thereby shortening the time for the high-voltage main circuit to be disconnected and improving the melting efficiency of the high-voltage main circuit. In addition, in the process of directly controlling the fuse to be disconnected according to the predetermined strategy, the larger the current in the high-voltage main circuit, the shorter the preset time is. In this way, the requirement for determining that the high-voltage main circuit has reached the melting condition can be reduced when the current is larger, further shortening the time for the high-voltage main circuit to be disconnected and improving the melting efficiency of the high-voltage main circuit.

[0105] Based on the same inventive concept, an embodiment of the present application also provides a control device for a power battery fuse corresponding to the above-mentioned control method for the power battery fuse. Since the principle of solving the problem by the device in the embodiment of the present application is similar to the method in the embodiment of the present application, the implementation of the device can refer to the implementation of the method, and the repeated parts will not be repeated.

[0106] Please refer to FIG4 , which shows a schematic structural diagram of a control device for a power battery fuse provided by an exemplary embodiment of the present application.

[0107] As shown in FIG4 , the control device includes:

[0108] An acquisition module 410 is configured to acquire the current of the high-voltage main circuit through the current sensor;

[0109] A judgment module 420 is configured to determine whether the high-voltage main circuit meets a fuse condition based on the current of the high-voltage main circuit;

[0110] The control module 430 is configured to control the fuse to be disconnected if the high-voltage main circuit reaches a fuse condition.

[0111] Optionally, the current sensor includes a first current sensor, and the measuring range of the first current sensor is a first measuring range; the judging module 420 is specifically configured to:

[0112] determining whether the current of the high-voltage main circuit exceeds the upper limit of the first measuring range;

[0113] If the current of the high-voltage main circuit does not exceed the upper range limit of the first range, it is determined whether the high-voltage main circuit reaches a fuse condition based on the current of the high-voltage main circuit and a preset threshold.

[0114] Optionally, the judgment module 420 is specifically configured to:

[0115] Determining whether the current of the high-voltage main circuit is greater than a first preset threshold and whether the time during which the current of the high-voltage main circuit is greater than the first preset threshold reaches a first preset time;

[0116] If yes, it is determined that the high voltage main circuit has reached a fuse condition;

[0117] and / or;

[0118] Determining whether the current of the high-voltage main circuit is greater than a second preset threshold and whether the time during which the current of the high-voltage main circuit is greater than the second preset threshold reaches a second preset time;

[0119] If yes, it is determined that the high voltage main circuit has reached a fuse condition;

[0120] The first preset threshold is smaller than the second preset threshold, the second preset threshold is smaller than the upper limit of the first range, and the first preset time is larger than the second preset time.

[0121] Optionally, the judgment module 420 is specifically configured to:

[0122] If the current of the high-voltage main circuit exceeds the upper limit of the first range, the time when the current of the high-voltage main circuit exceeds the upper limit of the first range is used as the starting sampling time;

[0123] Acquire parameter data of the battery pack at the sampling start time and parameter data of the battery pack at each sampling time after the sampling start time;

[0124] For each sampling moment, determining a difference 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 determining the difference as the difference data of the parameter data of the battery pack at the sampling moment;

[0125] Based on the difference data of the parameter data of the battery pack, it is determined whether the high-voltage main circuit reaches a fuse condition.

[0126] Optionally, the parameter data of the battery pack includes at least one of the following items: 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 includes the total voltage difference of the battery pack; the difference data of the minimum cell voltage of the battery cells in the battery pack includes the cell voltage difference of the minimum cell voltage.

[0127] Optionally, the judgment module 420 is specifically configured to:

[0128] determining whether the time during which the current of the high-voltage main circuit exceeds the upper limit of the first range reaches a third preset time;

[0129] If yes, it is determined that the high voltage main circuit has reached a fuse condition;

[0130] and / or;

[0131] The parameter data of the battery pack includes the total voltage of the battery pack; the difference data of the total voltage of the battery pack includes the total voltage difference of the battery pack;

[0132] determining whether the total voltage difference is greater than a third preset threshold and whether the time for which the total voltage difference is greater than the third preset threshold reaches a fourth preset time;

[0133] If yes, it is determined that the high voltage main circuit has reached a fuse condition;

[0134] and / or;

[0135] The parameter data of the battery pack includes 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 includes the cell voltage difference of the minimum cell voltage.

[0136] determining whether the minimum cell voltage difference is greater than a fourth preset threshold and whether the time for which the minimum cell voltage difference is greater than the fourth preset threshold reaches a fifth preset time;

[0137] If yes, it is determined that the high voltage main circuit has reached a fuse condition;

[0138] Among them, the third preset threshold is greater than the upper limit of the first range, the fourth preset threshold is greater than the third preset threshold; the third preset time is greater than the fourth preset time; the fourth preset time is greater than or equal to the fifth preset time.

[0139] Optionally, the current sensor further includes a second current sensor, 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;

[0140] 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.

[0141] The control device provided in the embodiment of the present application obtains the current of the high-voltage main circuit through the current sensor; determines whether the high-voltage main circuit has reached the melting condition based on the current of the high-voltage main circuit; and controls the fuse to be disconnected if the high-voltage main circuit has reached the melting condition. 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 the fuse that will only melt when the heat accumulation reaches a certain value, the time for directly controlling the fuse to be disconnected is shorter (generally in milliseconds), thereby shortening the time it takes for the high-voltage main circuit to be disconnected and improving the melting efficiency of the high-voltage main circuit.

[0142] Please refer to Figure 5 , which is a schematic diagram of the structure of a vehicle provided in an embodiment of the present application. As shown in Figure 5 , the vehicle 500 includes a processor 510 , a memory 520 , and a bus 530 .

[0143] The memory 520 stores machine-readable instructions executable by the processor 510. When the electronic device 500 is running, the processor 510 communicates with the memory 520 through the bus 530. When the machine-readable instructions are executed by the processor 510, the steps of the power battery fuse control method in the above-mentioned method embodiment can be executed. The specific implementation method can be found in the method embodiment and will not be repeated here.

[0144] An embodiment of the present application further provides a computer-readable storage medium, on which a computer program is stored. When the computer program is executed by a processor, the steps of the method for controlling the power battery fuse in the above-mentioned method embodiment can be executed. The specific implementation method can be found in the method embodiment and will not be repeated here.

[0145] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the systems, devices and units described above can refer to the corresponding processes in the aforementioned method embodiments and will not be repeated here.

[0146] In the several embodiments provided in this application, it should be understood that the disclosed systems, devices and methods can be implemented in other ways. The device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. There may be other division methods in actual implementation. For example, multiple units or components may be combined or integrated into another system, or some features may be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed may be through some communication interface, indirect coupling or communication connection of devices or units, which may be electrical, mechanical or other forms.

[0147] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of these units may be selected to achieve the purpose of this embodiment according to actual needs.

[0148] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit.

[0149] If the functions are implemented in the form of software functional units and sold or used as independent products, they can be stored in a non-volatile computer-readable storage medium that is executable by a processor. Based on this understanding, the technical solution of the present application can essentially or in other words, the part that contributes to or the part of the technical solution can be embodied in the form of a software product. The computer software product is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes various media that can store program codes, such as a USB flash drive, a mobile hard disk, a read-only memory (ROM), a random access memory (RAM), a magnetic disk or an optical disk.

[0150] Finally, it should be noted that the above-described embodiments are only specific implementation methods of the present application, which are used to illustrate the technical solutions of the present application, rather than to limit them. The scope of protection of the present application is not limited thereto. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that any person skilled in the art can modify or easily conceive of changes to the technical solutions described in the above-mentioned embodiments within the technical scope disclosed in the present application, or perform equivalent replacements for some of the technical features thereof. These modifications, changes, or replacements do not deviate from the spirit and scope of the technical solutions of the embodiments of the present application, and should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims. Industrial Applicability

[0151] By adopting the above scheme, 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 will only blow when the heat accumulation reaches a certain value. The time for controlling the fuse to be directly disconnected is shorter (generally in milliseconds), thereby shortening the time for the high-voltage main circuit to be disconnected and improving the fusing efficiency of the high-voltage main circuit.

Claims

1. A control method for a power battery fuse, characterized in that: A BMS applied to a power battery system, the power battery system comprising: a fuse and a current sensor arranged on a high-voltage main circuit in the power battery system; the control method comprising: Acquiring the current of the high-voltage main circuit through the current sensor; Determining whether the high-voltage main circuit has reached a fuse condition based on the current of the high-voltage main circuit; If the high-voltage main circuit reaches the fuse condition, the fuse is controlled to be disconnected.

2. The control method according to claim 1, characterized in that: The current sensor includes a first current sensor, and the range of the first current sensor is a first range; the determining whether the high-voltage main circuit reaches a fuse condition based on the current of the high-voltage main circuit includes: Determining whether the current of the high-voltage main circuit exceeds the upper limit of the first range; If the current of the high-voltage main circuit does not exceed the upper range limit of the first range, it is determined whether the high-voltage main circuit reaches a fuse condition based on the current of the high-voltage main circuit and a preset threshold.

3. The control method according to claim 2, characterized in that: The determining whether the high-voltage main circuit reaches a fuse condition based on the current of the high-voltage main circuit and a preset threshold value includes: Determine whether the current of the high-voltage main circuit is greater than a first preset threshold and whether the time during 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 has reached the fuse condition; and / or; Determine whether the current of the high-voltage main circuit is greater than a second preset threshold and whether the time during 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 has reached the fuse condition; Among them, the first preset threshold is smaller than the second preset threshold, the second preset threshold is smaller than the upper limit of the first range; and the first preset time is larger 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 circuit exceeds the upper limit of the first range, the time when the current of the high-voltage main circuit exceeds the upper limit of the first range is used as the start sampling time, and 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 are acquired; 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 determining the difference value as the difference data of the parameter data of the battery pack at the sampling moment; Based on the difference data of the parameter data of the battery pack, it is determined whether the high-voltage main circuit reaches a fuse condition.

5. The control method according to claim 4, characterized in that: The parameter data of the battery pack includes at least one of the following items: 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 includes the total voltage difference of the battery pack; the difference data of the minimum cell voltage of the battery cells in the battery pack includes the cell voltage difference of the minimum cell voltage.

6. The control method according to claim 5, characterized in that: The determining whether the high-voltage main circuit reaches a fuse condition based on the difference data of the parameter data of the battery pack includes: Determining whether the time during which the current of the high-voltage main circuit exceeds the upper limit of the first range reaches a third preset time; If yes, it is determined that the high voltage main circuit has reached the fuse condition; and / or; The parameter data of the battery pack includes the total voltage of the battery pack; the difference data of the total voltage of the battery pack includes the total voltage difference of the battery pack; Determining whether the total voltage difference is greater than a third preset threshold and whether the 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 has reached the fuse condition; and / or; The parameter data of the battery pack includes 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 includes the cell voltage difference of the minimum cell voltage. Determine whether the minimum cell voltage difference is greater than a fourth preset threshold and whether the time for which the minimum cell voltage difference is greater than the fourth preset threshold reaches a fifth preset time; If yes, it is determined that the high voltage main circuit has reached the fuse condition; Among them, the third preset threshold is greater than the upper limit of the first range, the fourth preset threshold is greater than the third preset threshold; the third preset time is greater than the fourth preset time; the fourth preset time is greater than or equal to the fifth preset time.

7. The control method according to claim 3, characterized in that: The current sensor further includes a second current sensor, the range of the second current sensor is a second range; the upper limit of the second range is smaller than the upper limit of the first range; The first preset threshold is smaller than the upper limit of the second range, and the second preset threshold is larger than the upper limit of the second range and smaller than the upper limit of the first range.

8. A control device for a power battery fuse, characterized in that: The control device is applied to a BMS in a power battery system, wherein the power battery system comprises: a fuse and a current sensor arranged on a high-voltage main circuit in the power battery system; the control device comprises: an acquisition module, configured to acquire the current of the high-voltage main circuit through the current sensor; A judgment module, configured to determine whether the high-voltage main circuit reaches a fuse condition based on the current of the high-voltage main circuit; The control module is configured to control the fuse to disconnect if the high-voltage main circuit reaches a fuse condition.

9. A vehicle, characterized in that: include: A processor, a memory and a bus, wherein the memory stores machine-readable instructions executable by the processor, and when the electronic device is running, the processor and the memory communicate through the bus, and the machine-readable instructions are executed by the processor to execute the steps of the method for controlling a power battery fuse as described in any one of claims 1 to 7.

10. A computer-readable storage medium, characterized in that: The computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the steps of the method for controlling a power battery fuse according to any one of claims 1 to 7 are executed.

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