Overcurrent protection method, electrical device and storage medium

Abstract

The present disclosure relates to the field of battery safety, and more particularly, to an overcurrent protection method, a power consumption device and a storage medium. A relay, a fuse and an explosion fuse are arranged on a main loop of a battery module. The method comprises: obtaining a current value of the main loop; obtaining a target current interval corresponding to the current value, the target current interval being contained in a preset current interval, wherein the preset current interval is determined based on an overcurrent point of the battery module and a cut-off capacity parameter of the relay, the fuse and the explosion fuse; and generating a first instruction according to the target current interval, the first instruction being used for overcurrent protection of the battery module.

Description

TECHNICAL FIELD

[0001] The present disclosure relates to the field of battery safety, and more particularly, to an overcurrent protection method, a power consumption device and a storage medium. BACKGROUND

[0002] The safety of the main loop of the battery pack is crucial, and major safety accidents such as arc drawing, ablation, and even smoking and fire caused by overcurrent often occur in the industry, causing great losses to users and seriously disrupting the development of the industry.

[0003] Currently, the battery pack usually realizes safety protection through relays and fuses. The relay can control the disconnection of the high-voltage loop for a limited number of times below the rated current, which can ensure safety to a certain extent. The high-voltage loop fuse can quickly disconnect when the current increases when the rated current is exceeded. If there is an incomplete short circuit in the high-voltage loop, the overload current exceeds the rated current of the electrical system, but does not reach the fuse current. The current of the entire high-voltage loop exceeds the bearing capacity, which may cause high-voltage loop ablation, arc drawing, and even smoking and fire. Therefore, the current battery pack cannot guarantee safety protection in all cases and cannot avoid safety risks in all cases. SUMMARY

[0004] One object of the present disclosure is to solve the safety risk problem of the battery pack.

[0005] According to one aspect of the present disclosure, an overcurrent protection method is provided, a relay, a fuse, and an explosion-proof fuse are arranged on a main loop of a battery module, and the method comprises:

[0006] obtaining a current value of the main loop;

[0007] obtaining a target current interval corresponding to the current value, the target current interval being included in a preset current interval, wherein the preset current interval is determined based on an overcurrent point of the battery module and a cut-off capability parameter of the relay, the fuse, and the explosion-proof fuse;

[0008] generating a first instruction according to the target current interval, the first instruction being used for overcurrent protection of the battery module.

[0009] Optionally, before obtaining the current value of the main loop, the method further comprises:

[0010] obtaining an overcurrent point of the battery module and a cut-off capability parameter of the relay, the fuse, and the explosion-proof fuse;

[0011] The preset current interval is determined according to the overcurrent point of the battery module and the cut-off capability parameters of the relay, the fuse, and the explosion-proof device, wherein the protection modes of different preset current intervals have different priorities.

[0012] Optionally, the cut-off capability parameters are corresponding parameters of current values and cut-off times, and the determination of the preset current interval according to the overcurrent point of the battery module and the cut-off capability parameters of the relay, the fuse, and the explosion-proof device comprises:

[0013] An interval in which the current value is less than a first current threshold is determined as a first interval, and the first current threshold is greater than the current value corresponding to the overcurrent point;

[0014] The second interval is determined, wherein for any current value in the second interval, a first time corresponding to the cut-off capability parameter of the explosion-proof device is less than a second time corresponding to the cut-off capability parameter of the relay, and the second time is less than a third time corresponding to the cut-off capability parameter of the fuse;

[0015] The third interval is determined, wherein for any current value in the third interval, the first time is less than the third time, and the third time is less than the second time;

[0016] The fourth interval is determined, wherein for any current value in the fourth interval, the first time is greater than the third time.

[0017] Optionally, the minimum value of the current corresponding to the cut-off capability parameter of the explosion-proof device is equal to the first current threshold.

[0018] Optionally, the first instruction comprises:

[0019] The battery module is protected against overcurrent by a first overcurrent protection mode of the target current interval;

[0020] In the case where the first overcurrent protection mode fails, the battery module is protected against overcurrent by a second overcurrent protection mode of the target current interval.

[0021] Optionally, the first overcurrent protection mode of the first interval is to control the output power of the battery module, and the second protection mode of the first interval comprises disconnecting the relay, disconnecting the explosion-proof device, and fusing the fuse.

[0022] In the case where the target current interval is the first interval, the protection against overcurrent of the battery module by the second overcurrent protection mode of the target current interval in the case where the first overcurrent protection mode fails comprises:

[0023] In a case where the current value of the main circuit exceeds the current value corresponding to the overcurrent point for a first preset time, the relay is controlled to be disconnected;

[0024] In a case where the relay fails to be disconnected for a second preset time, the explosion-proof fuse is controlled to be disconnected.

[0025] In a case where the explosion-proof fuse fails to be disconnected, the battery module is protected from overcurrent by fusing the fuse.

[0026] Optionally, the first overcurrent protection mode of the second interval is to disconnect the explosion-proof fuse; and the second protection mode of the second interval includes disconnecting the relay and fusing the fuse.

[0027] In a case where the target current interval is the second interval, the second overcurrent protection mode of the target current interval is used to protect the battery module from overcurrent in a case where the first overcurrent protection mode fails, including:

[0028] In a case where the explosion-proof fuse fails to be disconnected for a third preset time, the relay is controlled to be disconnected.

[0029] In a case where the relay fails to be disconnected, the battery module is protected from overcurrent by fusing the fuse.

[0030] Optionally, the first overcurrent protection mode of the third interval is to disconnect the explosion-proof fuse; and the second protection mode of the third interval includes fusing the fuse.

[0031] In a case where the target current interval is the third interval, the second overcurrent protection mode of the target current interval is used to protect the battery module from overcurrent in a case where the first overcurrent protection mode fails, including:

[0032] In a case where the explosion-proof fuse fails to be disconnected, the battery module is protected from overcurrent by fusing the fuse.

[0033] Optionally, the first overcurrent protection mode of the fourth interval is to fuse the fuse; and the second protection mode of the fourth interval includes disconnecting the explosion-proof fuse.

[0034] In a case where the target current interval is the fourth interval, the second overcurrent protection mode of the target current interval is used to protect the battery module from overcurrent in a case where the first overcurrent protection mode fails, including:

[0035] In a case where the fuse fails to be fused for a fourth preset time, the explosion-proof fuse is controlled to be disconnected.

[0036] Optionally, in the case where the battery module is arranged in a vehicle, before acquiring the cut-off capability parameters of the battery module, the relay, the fuse and the explosion fuse, the method further comprises:

[0037] acquiring the cut-off capability parameters of the vehicle fuse of the target vehicle to which the battery module is applied;

[0038] determining the model of the relay and the fuse in the main circuit of the battery module and the triggering time of the explosion fuse according to the cut-off capability parameters of the vehicle fuse, so that at least one of the relay, the fuse and the explosion fuse is disconnected before the vehicle fuse in the second interval, the third interval and the fourth interval.

[0039] According to a second aspect of the present disclosure, a power consumption device is provided, comprising a battery module, a processor and a memory, a relay, a fuse and an explosion fuse are arranged on the main circuit of the battery module, and the computer instructions are executed by the processor to realize the steps of the method of any one of the first aspect.

[0040] According to a third aspect of the present disclosure, a storage medium is provided, which stores computer instructions, and the computer instructions are executed by the processor to realize the steps of the method of any one of the first aspect.

[0041] One technical effect of the present disclosure is to provide an overcurrent protection method, which can acquire the current value of the main circuit of the battery module and further acquire the target current interval corresponding to the current value in the preset current interval, wherein the preset current interval is determined based on the overcurrent point of the battery module and the cut-off capability parameters of the relay, the fuse and the explosion fuse, and then the instructions for overcurrent protection of the battery module are generated according to the target current interval. In this way, the current interval can be set according to the performance of various circuit breakers in the battery module circuit, and the circuit can be reasonably protected according to the protection mode of the corresponding current interval, which has strong compatibility. At the same time, the explosion fuse can also protect the circuit in the case where the fuse or the relay cannot be disconnected, solving the safety risk problem of the battery module under various conditions.

[0042] Other features and advantages of the embodiments of the present disclosure will become apparent from the following detailed description of exemplary embodiments thereof, with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0043] The accompanying drawings, which form a part of the specification, illustrate embodiments of the present disclosure and, together with the description, serve to explain the principles of the embodiments of the present disclosure.

[0044] Figure 1 is a flowchart of an overcurrent protection method according to an embodiment;

[0045] Figure 2 is a schematic diagram of an example of an overcurrent protection method according to an embodiment;

[0046] Figure 3 is a block diagram of an electric device according to one embodiment; DETAILED DESCRIPTION

[0047] Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. It should be noted that unless otherwise specifically stated, the relative arrangement of components and steps, numerical expressions and numerical values ​​set forth in these embodiments do not limit the scope of the present invention.

[0048] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the invention, its application, or uses.

[0049] Techniques and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the techniques and equipment should be considered part of the specification.

[0050] In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not limiting. Therefore, other examples of the exemplary embodiments may have different values.

[0051] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0052] The embodiment of the present application discloses an overcurrent protection method, in which a relay, a fuse and an explosion insurance can be provided on the main circuit of the battery module, such as Figure 1 As shown, it includes steps S11 to S13.

[0053] Step S11, obtaining the current value of the main circuit.

[0054] In this embodiment, a current sensor can be provided on the main circuit of the battery module to collect the current value of the main circuit of the battery module. Specifically, the current sensor in the main circuit can be configured with multiple different types of sensors to collect and verify the current, such as a shunt or Hall effect sensor, to increase the robustness of the system.

[0055] In this embodiment, the battery module can be a battery pack, a battery module, or some device module including a battery. In this application, the explosion fuse is a fuse that can be actively triggered to disconnect, and the specific trigger current and time can be configured. The fuse is a fuse that is passively blown, and has a corresponding melting current and time based on the type of fuse.

[0056] In step S12, a target current interval corresponding to the current value is obtained, and the target current interval is included in a preset current interval, wherein the preset current interval is determined based on an overcurrent point of the battery module and cut-off capability parameters of the relay, the fuse, and the explosion-proof device.

[0057] In one example of the embodiment, before the current value of the main circuit is obtained, the method further includes: obtaining the overcurrent point of the battery module and the cut-off capability parameters of the relay, the fuse, and the explosion-proof device; and determining the preset current interval according to the overcurrent point of the battery module and the cut-off capability parameters of the relay, the fuse, and the explosion-proof device, wherein the protection modes of different preset current intervals have different priorities.

[0058] In one example, the power MAP data of the battery cell module of the battery pack can be obtained in advance, and the overcurrent point of the battery pack is determined according to the data. In the embodiment, the overcurrent point of the battery pack is the point at which the battery pack can withstand the maximum current capacity in the charging and discharging conditions. In the embodiment, the cut-off capability parameters of the relay, the fuse, and the explosion-proof device can be the parameters corresponding to a certain current value and cut-off time of the above-mentioned devices, which can be obtained when the device model is determined.

[0059] After the overcurrent point of the battery pack and the cut-off capability parameters of the relay, the fuse, and the explosion-proof device are determined, in order to intuitively illustrate, the time-current tolerance curve composed of the above-mentioned cut-off capability parameters, which can also be called a cut-off capability curve, and the overcurrent point can be placed in a graph, as shown in FIG. 1. Figure 2 As shown in FIG. 1, the horizontal axis is the current value, and the vertical axis is the time.

[0060] In the embodiment, the cut-off capability parameter is the corresponding parameter of the current value and the cut-off time. The preset current interval is determined according to the overcurrent point of the battery module and the cut-off capability parameters of the relay, the fuse, and the explosion-proof device, including: determining a first interval in which the current value is less than a first current threshold, and the first current threshold is greater than the current value corresponding to the overcurrent point; determining a second interval, wherein for any current value in the second interval, the first time corresponding to the cut-off capability parameter of the explosion-proof device is less than the second time corresponding to the cut-off capability parameter of the relay, and the second time is less than the third time corresponding to the cut-off capability parameter of the fuse; determining a third interval, wherein for any current value in the third interval, the first time is less than the third time, and the third time is less than the second time; and determining a fourth interval, wherein for any current value in the fourth interval, the first time is greater than the third time.

[0061] In one example, reference is made to FIG. 1. Figure 2, the maximum current capacity of the battery can be determined first, that is, the overcurrent point, and then a current threshold greater than the current value corresponding to the overcurrent point can be set according to the actual situation of the battery module and the circuit. And the interval with a current value less than the threshold is the first interval. Then, in the interval remaining in the first interval, other intervals can be determined. Specifically, the interval in which the time corresponding to the cut-off capability parameter of the explosion insurance corresponding to any same current value is less than the time corresponding to the cut-off capability parameter of the relay, and the time corresponding to the cut-off capability parameter of the relay is less than the time corresponding to the cut-off capability parameter of the fuse, is taken as the second interval, that is Figure 2 In this embodiment, the interval in which the curve of the explosion insurance is below the curve of the relay, and the curve of the relay is below the curve of the fuse, is taken as the second interval. Then, the interval in which the time corresponding to the cut-off capability parameter of the explosion insurance is less than the time corresponding to the cut-off capability parameter of the fuse, and the time corresponding to the cut-off capability parameter of the fuse is less than the time corresponding to the cut-off capability parameter of the relay, is taken as the third interval, that is Figure 2 In this embodiment, the interval in which the curve of the explosion insurance is below the curve of the fuse, and the curve of the fuse is below the curve of the relay, is taken as the third interval. Then, the interval in which the time corresponding to the cut-off capability parameter of the fuse is less than the time corresponding to the cut-off capability parameter of the explosion insurance, is taken as the fourth interval, that is Figure 2 In this embodiment, the interval in which the curve of the explosion insurance is above the curve of the fuse, is taken as the fourth interval.

[0062] In another example, when determining the second, third and fourth intervals, the intersection point of the curve of the fuse and the curve of the relay, that is, the current value corresponding to the point with the same cut-off capability parameter, can be determined as the separation point of the second interval and the third interval, and the intersection point of the curve of the explosion insurance and the curve of the main insurance, that is, the current value corresponding to the point with the same cut-off capability parameter, can be determined as the division point of the third interval and the fourth interval.

[0063] In one example of the embodiment, the protection mode of the highest priority level of the preset current interval can be determined according to the cut-off capability parameters of the devices in the interval. For example, the protection mode of the device that is most likely to trigger cut-off in a certain interval can be taken as the protection mode of the highest priority level of the interval, and then the priority of the trigger time decreases in turn. That is Figure 2 In this embodiment, the protection mode corresponding to the lowest curve in a certain interval.

[0064] In one example of the embodiment, before obtaining the overcurrent point of the battery pack and the time-current tolerance curves of the relay, the fuse and the explosion insurance, the method comprises: setting a minimum value of a current triggering the explosion insurance and a trigger time, wherein the minimum value is equal to a first current threshold; and determining the cut-off capability parameter of the explosion insurance according to the minimum value and the trigger time.

[0065] In the embodiment, the battery management system can pre-configure the minimum current value triggering the explosion fuse and the triggering time, and determine the cut-off capability parameter of the explosion fuse according to the minimum value and the time. In the example, the triggering minimum value can be the first current threshold, which can be set after the overcurrent point of the battery pack is determined.

[0066] In step S13, a first instruction is generated according to the target current interval, and the first instruction is used for overcurrent protection of the battery module.

[0067] In an example of the embodiment, the current value of the main loop of the battery module can be obtained, and the target current interval corresponding to the current value in the preset current interval is further obtained, wherein the preset current interval is determined based on the overcurrent point of the battery module and the cut-off capability parameters of the relays, the fuses and the explosion fuses, and then an instruction for overcurrent protection of the battery module is generated according to the target current interval. In this way, the current interval can be set according to the performance of various circuit breakers in the battery module loop, and the circuit can be reasonably protected according to the protection mode of the corresponding current interval, which has strong compatibility. At the same time, the explosion fuse can also protect the circuit in the case that the fuse or the relay cannot be disconnected, and the safety risk problem of the battery module under various conditions can be solved.

[0068] In an example of the embodiment, the first instruction includes: overcurrent protection of the battery module by a first overcurrent protection mode of the target current interval; and overcurrent protection of the battery module by a second overcurrent protection mode of the target current interval in the case that the first overcurrent protection mode fails.

[0069] In the embodiment, when the current of the main loop of the battery pack is in the preset interval, the preferred protection mode in the preset interval can be used for overcurrent protection, and the backup mode can be used for protection in the case that the preferred mode fails.

[0070] In the example, multiple overcurrent protection modes are set, and multiple disconnection mechanisms exist in the main loop, so that the second backup strategy can be used for disconnection when the preferred protection mode fails, and the safety of the high-voltage loop can be protected comprehensively.

[0071] In one example of the embodiment, the first overcurrent protection mode of the first interval is to control the output power of the battery module; the second protection mode of the first interval includes disconnecting the relay, disconnecting the explosion fuse and fusing the fuse; in the case where the target current interval is the first interval, in the case where the first overcurrent protection mode fails, the battery module is protected by the second overcurrent protection mode of the target current interval, including: in the case where the current value of the main loop exceeds the current value corresponding to the overcurrent point for a first preset time, the relay is controlled to be disconnected; in the case where the relay fails to be disconnected within a second preset time, the explosion fuse is controlled to be disconnected; in the case where the explosion fuse fails to be disconnected, the battery module is protected by fusing the fuse.

[0072] In one example, in the first interval, the current of the battery pack main loop is relatively low, at this time, the output power of the battery pack can always be limited by the battery management system, and the current value of the main loop is controlled by software control. When the current value exceeds the performance limit value of the main loop for a certain time, it can be determined that the overcurrent protection mode of limiting the output power of the battery management system fails. At this time, the second protection mode of the first interval can be used for overcurrent protection. The second protection mode of the first interval can include a relay, a fuse and an explosion fuse.

[0073] In the case where the first overcurrent protection mode fails, for example, in the case where the current value of the main loop always exceeds the current value of the overcurrent point for a certain time, such as 1 second, the relay can be actively controlled to be disconnected by the BMS, and then it is detected whether the relay is successfully disconnected. Specifically, whether the relay is disconnected can be determined by detecting the resistance value of the relay. If the relay fails to be disconnected within a preset time, the explosion fuse can be controlled to be disconnected by the BMS. Then, it can be continuously detected whether the explosion fuse is successfully disconnected. If it is not disconnected, the fuse can be used for overcurrent protection, and it is automatically fused after a certain time.

[0074] In the embodiment, the time corresponding to the preset time threshold should be less than the fusing time of the corresponding device. That is, when the relay and the explosion fuse are controlled to be disconnected, they are actively controlled to be disconnected to avoid damaging the load and other parts of the battery pack in the circuit and to improve the service life of the relay or the explosion fuse.

[0075] In the embodiment, the relay can include a positive relay arranged on the positive pole of the main loop and a negative relay arranged on the negative pole of the main loop.

[0076] In this example, when the current is in the first interval, i.e., the low interval, the output power can be controlled to limit the current of the main loop to avoid the impact of the circuit break on the use of the battery. Then, in the case where this mode fails, the relay, the explosion fuse and the like can be actively disconnected to protect the safety of the battery pack, and when all modes fail, the fuse can be fused to protect the safety of the battery pack.

[0077] In one example of the embodiment, the first overcurrent protection mode of the second interval is to disconnect the explosion-proof fuse; the second protection mode of the second interval includes disconnecting the relay and fusing the fuse; in the case where the target current interval is the second interval, in the case where the first overcurrent protection mode fails, the battery module is protected against overcurrent by the second overcurrent protection mode of the target current interval, including: in the case where the explosion-proof fuse fails to disconnect within a third preset time, the relay is controlled to disconnect; in the case where the relay fails to disconnect, the battery module is protected against overcurrent by fusing the fuse.

[0078] In one example, the fusing sequence of the devices in the second interval is explosion-proof fuse, relay, and fuse. Therefore, the explosion-proof fuse can be used as the first overcurrent protection mode of the second interval, in the case where this overcurrent protection mode fails, for example, in the case where the explosion-proof fuse fails to trigger after the preset triggering time, the relay is actively controlled by the BMS to disconnect, then it is detected whether the relay is successfully disconnected, specifically, whether the relay is disconnected can be determined by detecting the resistance value of the relay, if the relay fails to disconnect, the fuse can be used to protect against overcurrent, and the fuse will automatically fuse after a certain time.

[0079] In one example of the embodiment, the first overcurrent protection mode of the third interval is to disconnect the explosion-proof fuse; the second protection mode of the third interval includes fusing the fuse; in the case where the target current interval is the third interval, in the case where the first overcurrent protection mode fails, the battery module is protected against overcurrent by the second overcurrent protection mode of the target current interval, including: in the case where the explosion-proof fuse fails to disconnect, the battery module is protected against overcurrent by fusing the fuse.

[0080] In one example, the fusing sequence of the devices in the third interval is explosion-proof fuse, fuse. Therefore, the explosion-proof fuse can be used as the first overcurrent protection mode of the third interval, in the case where this overcurrent protection mode fails, for example, in the case where the explosion-proof fuse fails to trigger after the preset triggering time, the fuse can be used to protect against overcurrent, and the fuse will automatically fuse after a certain time.

[0081] In one example of the embodiment, the first overcurrent protection mode of the fourth interval is to fuse the fuse; the second protection mode of the fourth interval includes disconnecting the explosion-proof fuse; in the case where the target current interval is the fourth interval, in the case where the first overcurrent protection mode fails, the battery module is protected against overcurrent by the second overcurrent protection mode of the target current interval, including: in the case where the fuse fails to fuse within a fourth preset time, the explosion-proof fuse is controlled to disconnect.

[0082] In one example, the fourth-interval fusing sequence is a fusing sequence of each device, which is a fuse, an explosion fuse. Therefore, the fuse can be used as the first overcurrent protection mode of the fourth interval, and when the overcurrent protection mode fails, the explosion fuse can be used for the last overcurrent protection, and the explosion fuse is triggered when the trigger time is reached.

[0083] In one example of the embodiment, when the battery module is arranged in a vehicle, before obtaining the cut-off capability parameters of the battery module, the relay, the fuse and the explosion fuse, the method further comprises: obtaining the cut-off capability parameters of the vehicle fuse of a target vehicle to which the battery module is applied; and determining the model of the relay and the fuse in the main circuit of the battery module and the trigger time of the explosion fuse according to the cut-off capability parameters of the vehicle fuse, so that at least one of the relay, the fuse and the explosion fuse is disconnected before the vehicle fuse in the second interval, the third interval and the fourth interval.

[0084] In one example, when the battery module is in a vehicle, the cut-off capability parameters of the vehicle fuse of the vehicle can be obtained first, and the model of the relay and the fuse and the trigger time of the explosion fuse are determined according to the cut-off capability parameters of the vehicle fuse. At least one of the relay, the fuse and the explosion fuse is disconnected before the vehicle fuse in the second interval, the third interval and the fourth interval. The vehicle fuse is avoided from being fused.

[0085] The embodiment of the application further provides a charging device 300, as shown in the figure, the charging device has a processor 301 and a memory 302 and a battery module 303, the main circuit of the battery module is provided with a relay, a fuse and an explosion fuse, the memory 302 stores computer instructions, and the computer instructions are executed by the processor 301 to realize any one of the overcurrent protection methods in the overcurrent protection method embodiment, and the same technical effects can be achieved. To avoid repetition, it will not be repeated here. Figure 3

[0086] The embodiment of the application further provides a storage medium, which stores computer instructions, and the computer instructions are executed by the processor to realize any one of the overcurrent protection method embodiments described above, and the same technical effects can be achieved. To avoid repetition, it will not be repeated here.

[0087] Each embodiment in the present disclosure is described in a progressive manner, and the same and similar parts of each embodiment can be referred to each other. Each embodiment focuses on the difference from other embodiments. Especially, the device and equipment embodiments are basically similar to the method embodiments, so the description is relatively simple, and the related parts can be referred to the part of the method embodiment.

[0088] ​The above describes specific embodiments of the present disclosure. Other embodiments are within the scope of the following claims. In some cases, the actions or steps recited in the claims can be performed in a different order and still achieve desirable results. Additionally, the processes depicted in the figures do not necessarily require the particular order shown or sequential order to achieve desirable results. In certain implementations, multitasking and parallel processing can be advantageous or possible.

[0089] Embodiments of the present disclosure can be a system, a method, and / or a computer program product. The computer program product can include a computer readable storage medium (or media) having computer readable program instructions thereon for causing a processor to carry out aspects of embodiments of the present disclosure.

[0090] The computer readable storage medium can be a tangible device that can retain and store instructions for use by an instruction execution device. The computer readable storage medium can be, for example, but is not limited to, an electronic storage device, a magnetic storage device, an optical storage device, an electromagnetic storage device, a semiconductor storage device, or any suitable combination of the foregoing. More specific examples (a non-exhaustive list) of the computer readable storage medium include the following: a portable computer diskette, a hard disk, a random access memory (RAM), a read-only memory (ROM), an erasable programmable read-only memory (EPROM or Flash memory), a static random access memory (SRAM), a portable compact disc read-only memory (CD-ROM), a digital versatile disk (DVD), a memory stick, a floppy disk, a mechanically encoded device such as punch-cards or punched tape, a

[0091] The computer readable program instructions described herein can be downloaded to respective computing / processing devices from a computer readable storage medium or to an external computer or external storage device via a network, for example, the Internet, a local area network, a wide area network and / or a wireless network. The network can comprise copper transmission cables, optical transmission fibers, wireless transmission, routers, firewalls, switches, gateway computers and / or edge servers. A network adapter card or network interface in each computing / processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium within the respective computing / processing device.

[0092] Computer readable program instructions for carrying out operations of embodiments of the present disclosure can be assembly instructions, instruction set architecture (ISA) instructions, machine instructions, machine dependent instructions, microcode, firmware instructions, state-setting data, or source or object code, in any combination of one or more programming languages, including an object oriented programming language such as Smalltalk, C++ or the like, and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The computer readable program instructions can execute entirely on the user's computer, partly on the user's computer, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the latter scenario, the remote computer can be connected to the user's computer through any type of network, including a local area network (LAN) or a wide area network (WAN), or the connection can be made to an external computer (for example, through the Internet using an Internet Service Provider). In some embodiments, electronic circuitry including, for example, programmable logic circuitry, field-programmable gate array (FPGA), or programmable logic array (PLA) can execute the computer readable program instructions by utilizing state information of the computer readable program instructions to personalize the electronic circuitry, in order to perform aspects of embodiments of the present disclosure.

[0093] The computer readable program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other device to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0094] The computer readable program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other device to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide processes for implementing the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0095] The computer readable program instructions can also be loaded onto a computer, other programmable data processing apparatus, or other device to cause a series of operational steps to be performed on the computer, other programmable apparatus or other device to produce a computer implemented process, such that the instructions which execute on the computer, other programmable data processing apparatus, or other device implement the functions / acts specified in the flowchart and / or block diagram block or blocks.

[0096] The flow diagrams and the block diagrams in the drawings are presented to illustrate the architecture, functionality, and operation of possible implementations of systems, methods and computer program products according to various embodiments of the present disclosure. In this regard, each block in the flow diagrams and the block diagrams can represent a module, segment, or portion of instructions, which comprises one or more executable instructions for implementing the specified logic functions. In some alternative implementations, the functions noted in the blocks can occur out of the order noted in the figures. For example, two blocks shown in succession may, in fact, be executed substantially concurrently, or the blocks may sometimes be executed in the reverse order, depending upon the functionality involved. It will also be noted that each block of the block diagrams and / or flow diagrams, and combinations thereof, can be implemented by special purpose hardware-based systems that perform the specified functions or acts, or combinations of special purpose hardware and

[0097] Embodiments of the present disclosure have been described above, and the description is intended to be illustrative of the embodiments and not restrictive. Many modifications and variations of the described embodiments are possible and are within the scope of the described embodiments. The selection of the terms to be used in the description is not intended to limit the scope of the embodiments described herein, but rather to best explain the principles of the embodiments, the practical application, or the improvement over the technology in the field that is within the scope of this disclosure.

Claims

1. An overcurrent protection method, applied to a battery module, characterized in that: The main circuit of the battery module is provided with a relay, a fuse and an explosion insurance, and the method includes: Obtaining the overcurrent point of the battery module and the disconnection capacity parameters of the relay, fuse, and explosion insurance; Determine a preset current interval based on the overcurrent point of the battery module and the disconnection capacity parameters of the relay, fuse, and explosion insurance, wherein the protection modes of different preset current intervals have different priorities, and the disconnection capacity parameter is a corresponding parameter of the current value and the disconnection time; Obtaining the current value of the main circuit; Obtaining a target current range corresponding to the current value, where the target current range is included in a preset current range, wherein the preset current range is determined based on an overcurrent point of the battery module and a disconnection capacity parameter of a relay, a fuse, and an explosion insurance; generating a first instruction according to the target current range, wherein the first instruction is used to perform overcurrent protection on the battery module; The step of determining the preset current range according to the overcurrent point of the battery module and the disconnection capacity parameters of the relay, fuse, and explosion insurance comprises: Determine an interval in which the current value is less than a first current threshold as a first interval, wherein the first current threshold is greater than the current value corresponding to the overcurrent point; Determining a second interval, wherein, for any current value in the second interval, a first time corresponding to the cutting capacity parameter of the explosion insurance is less than a second time corresponding to the cutting capacity parameter of the relay, and the second time is less than a third time corresponding to the cutting capacity parameter of the fuse; determining a third interval, wherein, for any current value in the third interval, the first time is less than the third time, and the third time is less than the second time; A fourth interval is determined, wherein corresponding to any current value in the fourth interval, the first time is greater than the third time.

2. The method according to claim 1, characterized in that The minimum value of the current corresponding to the cutting capability parameter of the explosion fuse is equal to the first current threshold.

3. The method according to claim 1, characterized in that The first instruction includes: Performing overcurrent protection on the battery module by using a first overcurrent protection method in the target current range; When the first overcurrent protection mode fails, the battery module is protected from overcurrent by a second overcurrent protection mode in a target current range.

4. The method according to claim 3, characterized in that The first overcurrent protection mode of the first interval is to control the output power of the battery module; the second protection mode of the first interval includes disconnecting the relay, disconnecting the explosion insurance and blowing the fuse; When the target current interval is the first interval, when the first overcurrent protection mode fails, performing overcurrent protection on the battery module by using a second overcurrent protection mode in the target current interval includes: When the current value of the main circuit exceeds the current value corresponding to the overcurrent point for a first preset time, controlling the relay to disconnect; If the relay fails to disconnect within a second preset time, controlling the explosion fuse to disconnect; In the event that the explosion fuse fails to disconnect, the battery module is protected from overcurrent by blowing the fuse.

5. The method according to claim 3, characterized in that The first overcurrent protection mode of the second interval is disconnection of the explosion fuse; the second protection mode of the second interval includes disconnection of the relay and blowing of the fuse; When the target current interval is the second interval, when the first overcurrent protection mode fails, performing overcurrent protection on the battery module by using the second overcurrent protection mode in the target current interval includes: If the explosion safety fails to disconnect within a third preset time, controlling the relay to disconnect; In the event that the relay fails to disconnect, the battery module is protected from overcurrent by blowing the fuse.

6. The method according to claim 3, characterized in that The first overcurrent protection mode of the third interval is disconnection of the explosion fuse; the second protection mode of the third interval includes fuse blowing; When the target current interval is the third interval, when the first overcurrent protection mode fails, performing overcurrent protection on the battery module by using the second overcurrent protection mode of the target current interval includes: In the event that the explosion fuse fails to disconnect, the battery module is protected from overcurrent by blowing the fuse.

7. The method according to claim 3, characterized in that The first overcurrent protection mode of the fourth interval is the melting of a fuse; the second protection mode of the fourth interval includes disconnecting an explosion fuse; When the target current interval is the fourth interval, when the first overcurrent protection mode fails, performing overcurrent protection on the battery module by using the second overcurrent protection mode of the target current interval includes: When the fuse fails to blow within a fourth preset time, the explosion fuse is controlled to be disconnected.

8. The method according to claim 2, characterized in that In the case where the battery module is installed in a vehicle, before obtaining the disconnection capacity parameters of the battery module, the relay, the fuse, and the explosion insurance, the method further includes: Obtaining a disconnection capacity parameter of a vehicle fuse of a target vehicle in which the battery module is applied; Based on the cutting capacity parameters of the vehicle fuse, the models of the relay and the fuse in the main circuit of the battery module and the triggering time of the explosion fuse are determined, so that at least one of the relay, the fuse and the explosion fuse is disconnected before the vehicle fuse in the second interval, the third interval and the fourth interval.

9. An electrical device, characterized in that: The invention comprises a battery module, a processor and a memory, wherein a relay, a fuse and an explosion insurance are provided on the main circuit of the battery module, and computer instructions are stored in the memory, and when the computer instructions are executed by the processor, the steps of the method described in any one of claims 1 to 8 are implemented.

10. A storage medium, characterized in that: Computer instructions are stored thereon, and when the computer instructions are executed by a processor, the steps of the method according to any one of claims 1 to 8 are implemented.

Images