Overcharge detection method and device, electronic equipment, storage medium and program product

Abstract

The invention discloses an overcharge detection method and device, electronic equipment, a storage medium and a program product. The overcharge detection method is used for carrying out overcharge detection on the energy storage equipment, the energy storage equipment comprises a single battery, the single battery comprises a battery cell and an anti-explosion valve, and the method comprises the following steps: acquiring the voltage of the battery cell of the single battery; on the basis of a preset valve opening judgment condition and the battery cell voltage, valve opening detection is carried out on the single battery to obtain a valve opening detection result, and under the condition that an anti-explosion valve of the single battery is opened, the battery cell voltage meets the preset valve opening judgment condition; and based on the valve opening detection result, determining whether the single battery is overcharged or not.

Description

Technical Field

[0001] The present application belongs to the technical field of electronic device detection, and in particular, relates to an overcharge detection method, an overcharge detection device, an electronic device, a computer-readable storage medium, and a computer program product. Background Art

[0002] Generally, a battery cell may include a bare aluminum sheet, an explosion-proof valve, positive and negative poles, upper plastic, lower plastic, sealing ring, etc. The explosion-proof valve is the weak point of pressure in the battery cell. When the battery cell is overcharged, the side reaction gas will cause the internal pressure of the battery cell to exceed the upper pressure limit of the explosion-proof valve, and the explosion-proof valve will open, thereby releasing the internal pressure of the battery cell to prevent explosion. Summary of the invention

[0003] The present application aims to solve at least one of the technical problems existing in the prior art. To this end, the present application proposes an overcharge detection method for electronic equipment, an overcharge detection device, an electronic device, a computer-readable storage medium and a computer program product, which detects the opening of the battery cell valve by the cell voltage, thereby determining whether the battery cell is overcharged by whether the cell valve is open, realizing overcharge detection of the battery cell, avoiding overcharge of the battery cell, and reducing the cost of overcharge detection without the need for additional overcharge detection components.

[0004] In a first aspect, the present application provides an overcharge detection method for overcharging an energy storage device, wherein the electronic device includes a battery cell, and the battery cell includes a battery cell and an explosion-proof valve. The method includes:

[0005] Obtaining the cell voltage of the battery cell;

[0006] Performing a valve opening detection on the battery cell based on a preset valve opening determination condition and the battery cell voltage to obtain a valve opening detection result, when the explosion-proof valve of the battery cell is opened, the battery cell voltage satisfies the preset valve opening determination condition;

[0007] Based on the valve opening detection result, it is determined whether the battery cell is overcharged.

[0008] In some embodiments, performing valve opening detection on the battery cell based on the preset valve opening determination condition and the cell voltage to obtain the valve opening detection result includes:

[0009] Determining whether the cell voltage satisfies the valve opening determination condition;

[0010] When the cell voltage satisfies the valve opening determination condition, determining that the explosion-proof valve of the battery cell is opened;

[0011] When the cell voltage does not satisfy the valve opening determination condition, it is determined that the explosion-proof valve of the battery cell is not opened.

[0012] In some embodiments, the valve opening determination condition includes that the cell voltage is greater than a preset cut-off voltage, and a second-order derivative of a voltage curve formed by the cell voltage is within a preset value range.

[0013] In some embodiments, the preset value range is determined based on voltage data collected when valves of each test battery cell having the same specification as the battery cell are opened.

[0014] In some embodiments, the overcharge detection method further includes stopping charging the battery cell when the battery cell voltage is greater than a preset overcharge cut-off voltage.

[0015] In some embodiments, determining whether the battery cell is overcharged based on the valve opening detection result includes:

[0016] When the explosion-proof valve is open, determining that the battery cell is overcharged;

[0017] When the explosion-proof valve is not opened, it is determined that the battery cell is not overcharged.

[0018] In some embodiments, the battery cell further includes an air pressure sensor, and the air pressure sensor is used to detect the air pressure in the battery cell. The determining whether the battery cell is overcharged based on the valve opening detection result includes:

[0019] Based on the gas pressure and the valve opening detection result, it is determined whether the battery cell is overcharged.

[0020] In some embodiments, determining whether the battery cell is overcharged based on the air pressure and the valve opening detection result includes determining that the battery cell is overcharged when the air pressure is greater than a preset air pressure, or when the air pressure is greater than a preset air pressure and the explosion-proof valve is open.

[0021] In a second aspect, the present application provides an overcharge detection device for overcharge detection of an energy storage device, wherein the electronic device includes a battery cell, the battery cell includes a battery cell and an explosion-proof valve, and the overcharge detection device includes:

[0022] An acquisition module, used for acquiring the cell voltage of the battery cell;

[0023] A valve opening detection module, used for performing valve opening detection on the battery cell based on a preset valve opening determination condition and the cell voltage to obtain a valve opening detection result;

[0024] A determination module is used to determine whether the battery cell is overcharged based on the valve opening detection result.

[0025] In a third aspect, the present application provides an electronic device, including:

[0026] A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the overcharge detection method when executing the program.

[0027] In a fourth aspect, the present application provides a non-transitory computer-readable storage medium having a computer program stored thereon, which implements the above-mentioned overcharge detection method when executed by a processor.

[0028] In a fifth aspect, the present application provides a computer program product, including a computer program, which implements the above-mentioned overcharge detection method when executed by a processor.

[0029] The overcharge detection method, overcharge detection device, electronic device, computer-readable storage medium and computer program product provided in the embodiments of the present application are based on the fluctuation law of the battery cell voltage caused by the opening of the battery cell valve. By obtaining the battery cell voltage of the battery cell and judging whether the battery cell voltage meets the preset valve opening judgment condition, the valve opening detection of the battery cell is realized to obtain the valve opening detection result. For example, when the explosion-proof valve of the battery cell is opened, the battery cell voltage meets the preset valve opening judgment condition. Based on the valve opening detection result, it is possible to quickly determine whether the battery cell is overcharged, and the overcharge detection of the battery cell can be realized based on the battery cell voltage to avoid overcharging of the battery cell. There is no need to set up additional overcharge detection components, which can reduce the cost of overcharge detection. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] The above and / or additional aspects and advantages of the present application will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0031] Figure 1 It is a structural schematic diagram of an energy storage device provided in certain embodiments of the present application from one perspective.

[0032] Figure 2 It is a schematic diagram of the structure of a battery cell provided in certain embodiments of the present application.

[0033] Figure 3 It is a first flow chart of the overcharge detection method provided in some embodiments of the present application.

[0034] Figure 4 It is a curve diagram of voltage at different times of the overcharge detection method provided in some embodiments of the present application.

[0035] Figure 5 It is a curve diagram of the second-order derivative of voltage versus time of the overcharge detection method provided in certain embodiments of the present application.

[0036] Figure 6 It is a second flow chart of the overcharge detection method provided in some embodiments of the present application.

[0037] Figure 7 3 is a schematic diagram of a third flow chart of an overcharge detection method provided in certain embodiments of the present application.

[0038] Figure 8 It is a module schematic diagram of an overcharge detection device provided in certain embodiments of the present application.

[0039] Fig. 9 It is a schematic diagram of the structure of an electronic device provided in some embodiments of the present application. DETAILED DESCRIPTION

[0040] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0041] For ease of understanding, the technical background and application scenarios of this application are first introduced below:

[0042] Battery overcharge detection is an important part of ensuring battery safety and extending battery life. When the battery cell is overcharged, gas will be generated inside the battery cell due to side reactions. When the internal pressure of the battery cell exceeds the upper pressure limit of the explosion-proof valve, the explosion-proof valve opens, thereby releasing the internal pressure of the battery cell to prevent explosion.

[0043] Generally, temperature sensors and smoke sensors are designed at the battery module level to monitor thermal runaway and fire of the battery cells in the battery module, but there is no device or method to monitor the opening of the battery cell valve. At present, the judgment of the opening of the valve is still based on the naked eye and video judgment, and it cannot be automatically monitored. If the battery cell has a built-in pressure sensor to realize overcharge detection, additional circuits need to be added, which increases the cost of the battery cell and poses a challenge to the reliability of the battery cell.

[0044] The applicant discovered that the amount of gas generated in the battery cell due to the side reaction of overcharging will affect the battery cell voltage. When the valve is opened during the overcharging process of the battery cell, the gas in the battery cell will be ejected and the amount of gas will decrease. At this time, the battery cell voltage will fluctuate. This fluctuation has a specific pattern and is universal. Therefore, the voltage fluctuation during the valve opening process can be used as a judgment condition for overcharging valve opening.

[0045] The overcharge detection method of the present application realizes overcharge valve opening detection of battery cells based on the rule that voltage fluctuations occur at the moment of valve opening during the overcharge process of the battery cell, thereby obtaining a valve opening detection result. Based on whether the battery cell has a valve open, it can be determined whether the battery cell is overcharged, thereby realizing overcharge detection of the battery cell and avoiding overcharging of the battery cell. There is no need to set up additional overcharge detection components, thereby reducing the cost of overcharge detection.

[0046] See also Figure 1 , Figure 1 1 is an application scenario diagram of an overcharge detection method provided in an embodiment of the present application. The application scenario provided in the present application includes an energy storage device 100.

[0047] In some embodiments, the energy storage device 100 may be an energy storage cabinet, which is a large device for storing electrical energy. One or more battery clusters may be arranged in the energy storage cabinet, and each battery cluster includes one or more battery packs 10 .

[0048] like Figure 1 As shown in , the battery pack 10 may include a box body 11, a box cover 12 and a battery module 13. The box cover 12 is arranged on the box body 11, the box body 11 and the box cover 12 enclose a receiving space, and the battery module 13 is arranged in the receiving space.

[0049] Optionally, the battery module 13 may include a plurality of battery cells 131. The plurality of battery cells 131 may be connected in series through electrical connectors 132 to form an integral battery module 13. The modular design of the battery cells 131 facilitates replacement or maintenance of the battery cells 131 when any battery cell 131 fails (such as hardware failure, thermal runaway, etc.). The battery module 13 forms a power supply circuit with an external load through the total positive and total negative to supply power. The battery module 13 is a core component of the energy storage device 100, which is used for energy storage and power supply.

[0050] See also Figure 2 Optionally, the battery cell 131 includes a battery housing 1311 , a battery core 1312 , and an explosion-proof valve 1313 . The battery core 1312 is disposed in the battery housing 1311 , and the explosion-proof valve 1313 is disposed in the battery housing 1311 .

[0051] When the voltage of the battery cell 131 is detected, it is only necessary to connect the electrical connector 132 corresponding to the battery cell 131 to detect the voltage corresponding to the battery cell 131 .

[0052] In some embodiments, there may be one or more battery packs 10 , one or more battery packs 10 may form a battery cluster, and the energy storage device 100 may include one or more battery clusters.

[0053] Optionally, the explosion-proof valve 1313 is located at the center of the surface corresponding to the battery housing 1311 and the box cover 12. In this way, the valve can be opened to release pressure in time to ensure the timeliness of overcharge detection.

[0054] Based on the introduction of the above-mentioned related scenarios, the embodiment of the present application provides an overcharge detection method for overcharge detection of an energy storage device. The overcharge detection method is described in detail below:

[0055] See also Figure 3 An overcharge detection method provided in an embodiment of the present application is implemented by steps 011 to 013, which are described in detail below.

[0056] Step 011: Obtain the cell voltage of the battery cell.

[0057] Among them, the cell voltage of a battery cell refers to the potential difference between the two poles of a single cell under a specific state. It is an important indicator reflecting the electrical characteristics of the cell.

[0058] Optionally, the battery cell may include one or more battery cells. When the battery cell includes one battery cell, the battery cell voltage of the battery cell is the voltage of the battery cell; and when the battery cell includes multiple battery cells, the battery cell voltage of the battery cell is the total voltage of the multiple battery cells.

[0059] The cell voltage is correlated with the battery cell power, such as the cell voltage and the battery cell power are positively correlated. Taking lithium iron phosphate battery as an example, the cell voltage parameters are as follows:

[0060] Nominal voltage: Generally 3.2V, which is the average voltage of the battery cell under normal working conditions, that is, the average voltage from the beginning of discharge to the end of discharge when fully charged.

[0061] High end charge voltage (hereinafter referred to as cut-off voltage): usually 3.6 V. When this voltage is reached, the battery is basically fully charged. If you continue to charge, it may cause overcharging, damage the battery, and affect the life and performance of the battery.

[0062] Low-level termination discharge voltage: generally 2.0 V. When the cell voltage drops to around 2.0 V, the cell power is basically exhausted. Continuing to discharge may cause over-discharge of the cell, causing irreversible damage to the cell.

[0063] However, the cell voltage may fluctuate in different scenarios. For example, the cell may be fully charged only when the voltage of a lithium iron phosphate battery reaches 4V. If the cell is determined to be fully charged at only 3.6V and charging is stopped, the battery cell's power will not be fully utilized.

[0064] Therefore, in addition to using the cell voltage and the cut-off voltage to determine overcharge, the present application also uses the cell voltage to perform valve opening detection, thereby improving the accuracy of overcharge detection.

[0065] Step 012: Performing valve opening detection on the battery cell based on the preset valve opening determination condition and the cell voltage to obtain a valve opening detection result, wherein the valve opening detection result includes whether the explosion-proof valve is open.

[0066] The valve opening judgment condition refers to the condition that the change in the cell voltage satisfies when the valve is opened.

[0067] Optionally, the valve opening determination condition includes that the cell voltage is greater than a preset cut-off voltage, and a second-order derivative of a voltage curve formed by the cell voltage is within a preset value range.

[0068] That is to say, when the cell voltage is greater than the cut-off voltage for possible overcharging, it is further determined whether the second-order derivative of the voltage curve formed by the cell voltage is within the preset value range [a, b]. When the second-order derivative is within the preset value range, it can be determined that the fluctuation of the cell voltage matches the voltage fluctuation law when the battery cell opens the valve, thereby determining whether the cell voltage of the battery cell meets the valve opening judgment condition.

[0069] For example, the valve opening judgment conditions include: V ≥ V0 and a ≤ |d 2 V / dt 2 ∣≤b; where V is the cell voltage, V0 is the cut-off voltage, and t is the acquisition time of the cell voltage.

[0070] Optionally, the preset value range is determined based on the voltage data collected when the valves of each test battery cell with the same specifications as the battery cell are opened. In this way, the overcharge valve opening test is performed on the test battery cell with the same specifications (such as the same type and functional parameters), and then the cell voltage when the valve is opened is collected, so as to solve the second-order derivative of the cell voltage based on the voltage curve of the cell voltage, and thus calibrate the preset value range [a, b].

[0071] It can be understood that the values ​​of a and b corresponding to different system types and different forms of battery cells may be different. Therefore, the value range of a and b needs to be accurately calibrated based on the actual measured data of the battery cell valve opening.

[0072] For example, for a 280Ah lithium iron phosphate square shell battery cell, a is 0.02 and b is 0.05.

[0073] In order to improve the accuracy of the preset value range, a single test battery cell can be calibrated multiple times, or multiple test battery cells can be calibrated to obtain multiple test value ranges. Based on the multiple test value ranges, the final preset value range is determined, such as determining the preset value range based on the average value of the boundary values ​​of each test value range.

[0074] Specifically, by judging whether the cell voltage satisfies the valve opening determination condition, the valve opening detection of the battery cell can be realized, thereby obtaining the valve opening detection result.

[0075] For an example, see Figure 4 , Figure 4 This is the curve of the cell voltage within 20 seconds (s) during the charging process of the battery cell. It can be seen that after the cell voltage exceeds the cut-off voltage (such as 3.6V), the cell voltage is still rising with overcharging, and the cell voltage changes significantly (suddenly decreases) when the explosion-proof valve opens. As the overcharging continues, when the subsequent voltage reaches the overcharge cut-off voltage, in order to avoid excessive overcharging, the battery cell will be controlled to stop charging. When charging stops, the cell voltage gradually decreases and gradually returns to the normal cut-off voltage.

[0076] The overcharge cut-off voltage is an empirical voltage to avoid excessive overcharging and damage to the battery, such as 5.5V.

[0077] See also Figure 5 , Figure 5 is the second-order derivative curve of the cell voltage. It can be seen that when the valve is opened, the second-order derivative value is within the preset value range [a, b]. Therefore, by judging whether the cell voltage is greater than the preset cut-off voltage and whether the second-order derivative value of the voltage curve formed by the cell voltage is within the preset value range, it can be determined whether the battery cell opens the valve. If the cell voltage is greater than the preset cut-off voltage and the second-order derivative value of the voltage curve formed by the cell voltage is within the preset value range, the battery cell opens the valve; and when the cell voltage is greater than the preset cut-off voltage and the second-order derivative value of the voltage curve formed by the cell voltage is greater than b (such as 0.05), it can be determined that the battery cell stops charging or other situations (such as discharging, etc.).

[0078] In this way, whether the battery cell has opened the valve can be quickly determined based on whether the cell voltage meets the valve opening determination condition.

[0079] See also Figure 6 Optionally, step 012 includes:

[0080] Step 0121: Determine whether the cell voltage meets the valve opening determination condition;

[0081] Step 0122: when the cell voltage meets the valve opening determination condition, determine that the explosion-proof valve of the battery cell is open;

[0082] Step 0123: When the cell voltage does not meet the valve opening determination condition, determine that the explosion-proof valve of the battery cell is not opened.

[0083] In this way, by judging whether the battery cell voltage meets the valve opening determination condition, when the battery cell voltage meets the valve opening determination condition, it can be accurately determined that the explosion-proof valve of the battery cell is open, and when the battery cell voltage does not meet the valve opening determination condition, it can be accurately determined that the explosion-proof valve is not open.

[0084] Step 013: Based on the valve opening detection result, determine whether the battery cell is overcharged.

[0085] When the explosion-proof valve is determined to be open based on the valve opening detection result, it can be determined that the gas generated by the battery cell causes the gas pressure in the battery cell to be greater than the valve opening pressure threshold, thereby accurately determining that the battery cell has been overcharged. When the explosion-proof valve is determined not to be open based on the valve opening detection result, it can be determined that the battery cell is not overcharged, or that overcharging has not caused the gas pressure in the battery cell to be greater than the valve opening pressure threshold. At this time, in order to ensure that the battery cell power is fully utilized, it can be determined that the battery cell is not overcharged, and the battery cell can continue to be charged to ensure that the battery cell power is fully charged.

[0086] The overcharge detection method of the present application is based on the fluctuation law of the cell voltage caused by the opening of the battery valve. By obtaining the cell voltage of the battery cell and judging whether the cell voltage meets the preset valve opening judgment condition, the valve opening detection of the battery cell is realized to obtain the valve opening detection result. For example, when the explosion-proof valve of the battery cell is opened, the cell voltage meets the preset valve opening judgment condition. Based on the valve opening detection result, it is possible to quickly determine whether the battery cell is overcharged, and the overcharge detection of the battery cell can be realized based on the cell voltage to avoid overcharging of the battery cell. There is no need to set up additional overcharge detection components, which can reduce the cost of overcharge detection.

[0087] See also Figure 7 In some embodiments, the battery cell further includes an air pressure sensor, which is used to detect the air pressure in the battery cell. Step 013: determining whether the battery cell is overcharged based on the valve opening detection result includes:

[0088] Step 0131: Determine whether the battery cell is overcharged based on the gas pressure and valve opening detection results.

[0089] Specifically, in order to improve the accuracy of overcharge detection, an air pressure sensor can be set in the battery shell of the battery cell. The air pressure sensor can detect the air pressure in the battery cell. When the battery cell of the battery cell is overcharged, gas will be generated, causing the air pressure in the battery cell to increase. Therefore, overcharge detection can be achieved by detecting the air pressure in the battery cell by the air pressure sensor.

[0090] For example, when the gas pressure in the battery cell is greater than the preset gas pressure, it can be determined that the battery cell generates gas due to overcharging, and therefore, it can be determined that the battery cell is overcharged.

[0091] The preset air pressure can be determined based on the air pressure when the battery cell is not overcharged and generates gas, so as to detect overcharging in time. Alternatively, the preset air pressure can be the valve opening voltage of the explosion-proof valve of the battery cell, and the valve opening voltage can be determined by detecting the voltage when the battery cell opens the valve, so as to determine whether the explosion-proof valve of the battery cell is open, and overcharging can be detected more accurately.

[0092] Therefore, by combining the gas pressure of the battery cell with the valve opening detection result, it can be more accurately determined whether the single cell is overcharged.

[0093] Optionally, based on the air pressure and valve opening detection results, determine whether the battery cell is overcharged, including determining that the battery cell is overcharged when the air pressure is greater than a preset air pressure, or when the air pressure is greater than the preset air pressure and the explosion-proof valve is open; and determine that the battery cell is not overcharged when the air pressure is less than the preset air pressure, or when the air pressure is less than the preset air pressure and the explosion-proof valve is not opened.

[0094] In this way, a more accurate overcharge detection can be achieved by combining the gas pressure of the battery cell and the valve opening detection results.

[0095] The overcharge detection method of the present application is based on the fluctuation law of the cell voltage caused by the opening of the battery valve. By obtaining the cell voltage of the battery cell and judging whether the cell voltage meets the preset valve opening judgment condition, the valve opening detection of the battery cell is realized to obtain the valve opening detection result. For example, when the explosion-proof valve of the battery cell is opened, the cell voltage meets the preset valve opening judgment condition. Based on the valve opening detection result, it is possible to quickly determine whether the battery cell is overcharged, and the overcharge detection of the battery cell can be realized based on the cell voltage to avoid overcharging of the battery cell. There is no need to set up additional overcharge detection components, which can reduce the cost of overcharge detection.

[0096] According to the method described in the above embodiment, the present application embodiment also provides an overcharge detection device 400, which is used to perform the steps in the above overcharge detection method. Figure 8 , Figure 8 : is a module diagram of an overcharge detection device 400 provided in an embodiment of the present application. The overcharge detection device 400 includes:

[0097] An acquisition module 401 is used to acquire the cell voltage of a battery cell;

[0098] The valve opening detection module 402 is used to perform valve opening detection on the battery cell based on the preset valve opening determination condition and the cell voltage to obtain the valve opening detection result;

[0099] The determination module 403 is used to determine whether the battery cell is overcharged based on the valve opening detection result.

[0100] It should be noted that the specific details of each module unit in the above-mentioned overcharge detection device have been described in detail in the embodiment of the above-mentioned overcharge detection method, and will not be repeated here.

[0101] In the embodiments of the present application, the term "module" or "unit" refers to a computer program or a part of a computer program with a predetermined function, and works together with other related parts to achieve a predetermined goal, and can be implemented in whole or in part by using software, hardware (such as processing circuits or memories) or a combination thereof. Similarly, a processor (or multiple processors or memories) can be used to implement one or more modules or units. In addition, each module or unit can be part of an overall module or unit that includes the function of the module or unit.

[0102] In some embodiments, the overcharge detection device in the embodiments of the present application can be implemented in hardware, such as an electronic device, or a component in an electronic device, such as an integrated circuit or a chip; the overcharge detection device can also be implemented in software, such as as an application installed in an electronic device.

[0103] In some embodiments, see Fig. 9 The electronic device 500 includes a processor 501 and a memory 502. The memory 502 stores a computer program 503 that can be run on the processor 501. When the program 503 is executed by the processor 201, each process of the embodiment of the above-mentioned overcharge detection method is implemented, and the same technical effect can be achieved. To avoid repetition, it will not be repeated here.

[0104] Optionally, the electronic device 500 may be an internal battery management system (BMS) built into the energy storage device, or the electronic device 500 may be an external BMS that is disposed outside the energy storage device and is communicatively connected to the energy storage device.

[0105] Fig. 9 The electronic device 500 according to an embodiment of the present application is a schematic block diagram of the structure. The electronic device 500 according to the embodiment of the present application may be a battery management system (BMS), an energy management system (EMS), an energy conversion system (PCS), a desktop computer, a laptop computer, a mobile terminal, a local server, a cloud server, etc.

[0106] like Fig. 9As shown, the electronic device 500 may include a processor 501, a memory 502, and an input / output (IO) interface 504. The processor 501, the memory 502, and the memory 502 are connected to each other via a bus.

[0107] The processor 501 can be used to control the overall operation of the electronic device 500 to complete all or part of the steps in the aforementioned method. The processor 501 may include one or more processing cores. The processor 501 uses various interfaces and lines to connect various parts of the entire electronic device, and executes various functions and data processing of the electronic device 500 by running or executing programs, instructions, code sets or instruction sets stored in the memory 502, and calling data stored in the memory 502. In one embodiment, the processor 501 can be implemented in at least one hardware form of digital signal processing (Digital Signal Processing, DSP), field programmable gate array (Field-Programmable Gate Array, FPGA), and programmable logic array (Programmable Logic Array, PLA). The processor 501 can integrate one or a combination of a central processing unit 501 (Central Processing Unit, CPU), an image processor 501 (Graphics Processing Unit, GPU) and a modem.

[0108] The memory 502 may be used to store various computer programs, instructions, code sets or instruction sets, etc. One or more computer programs may be configured to implement the methods described in the above embodiments when executed by one or more processors 501. The memory 502 may include a random access memory (Random Access Memory, RAM), such as a static random access memory (Static Random Access Memory, SRAM), and may also include a read-only memory (Read-Only Memory, ROM), an electrically erasable programmable read-only memory (Electrically Erasable Programmable Read-Only Memory, EEPROM), an erasable programmable read-only memory (Erasable Programmable Read-Only Memory, EPROM), a programmable read-only memory (Programmable Read-Only Memory, PROM), a read-only memory (Read-Only Memory, ROM), a magnetic memory, a flash memory, a magnetic disk or an optical disk.

[0109] The memory 502 is used to provide an interface for information input or output between the electronic device 500 and external devices. The external devices include but are not limited to keyboards, mice, USB flash drives, hard disks, display screens, debugging equipment, host computers, fire protection, control panels, power grids, battery management systems (BMS), energy management systems (EMS), power conversion systems (PCS), energy storage devices (e.g., batteries, battery modules, battery packs, etc.), desktop computers, laptop computers, mobile terminals, local servers, cloud servers, etc. The memory 502 can support various communication protocols, such as Recommended Standard 485 (RS485), Recommended Standard 232 (RS232), Controller Area Network (CAN), Ethernet, International Electrotechnical Commission (IEC) 104, Message Queuing Telemetry Transport (MQTT), High Definition Multimedia Interface (HDMI), Universal Serial Bus (USB), and other communication protocols.

[0110] An embodiment of the present application further provides a computer-readable storage medium on which a computer program is stored, and the computer program implements the steps of the above-mentioned method embodiments when executed by the processor 501. Examples of computer-readable storage media include but are not limited to the memory 502 described above.

[0111] An embodiment of the present application provides a computer program product, including a computer program, which implements the steps in the above-mentioned method embodiments when executed by the processor 501.

[0112] Those skilled in the art should understand that the various modules or components according to the embodiments of the present application can be implemented in whole or in part by software, hardware, or a combination thereof. The above modules or components can be embedded in or independent of the processor 501 in the electronic device 500 in the form of hardware, or can be stored in the memory 502 in the electronic device 500 in the form of software, so that the processor 501 can call and execute the operations corresponding to the above modules.

[0113] Those skilled in the art will appreciate that the various modules or components shown herein are merely schematic block diagrams of partial structures related to the present application solution, and do not constitute a limitation on the electronic device 500 to which the present application solution is applied. The specific electronic device 500 may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements, or have components that are geographically dispersed. The components shown herein, their connections and relationships, and their functions are merely examples, and are not intended to limit the implementation of the present invention described and / or required herein.

[0114] The above-described embodiments only express several implementation methods of the present application, and the descriptions thereof are relatively specific and detailed, but they cannot be understood as limiting the scope of the present application. It should be pointed out that, for a person of ordinary skill in the art, several variations and improvements can be made without departing from the concept of the present application, and these all belong to the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the attached claims.

Claims

1. An overcharge detection method, characterized in that: Used to detect overcharge of an energy storage device, the energy storage device includes a battery cell, the battery cell includes a battery core and an explosion-proof valve, the method includes: Obtaining the cell voltage of the battery cell; Performing a valve opening detection on the battery cell based on a preset valve opening determination condition and the cell voltage to obtain a valve opening detection result, wherein the valve opening detection result includes whether the explosion-proof valve is open; Based on the valve opening detection result, it is determined whether the battery cell is overcharged.

2. The overcharge detection method according to claim 1, characterized in that: The performing valve opening detection on the battery cell based on the preset valve opening determination condition and the cell voltage to obtain the valve opening detection result includes: Determining whether the cell voltage satisfies the valve opening determination condition; When the cell voltage satisfies the valve opening determination condition, determining that the explosion-proof valve of the battery cell is opened; When the cell voltage does not satisfy the valve opening determination condition, it is determined that the explosion-proof valve of the battery cell is not opened.

3. The overcharge detection method according to claim 1 or 2, characterized in that: The valve opening determination conditions include: The cell voltage is greater than a preset cut-off voltage, and a second-order derivative of a voltage curve formed by the cell voltage is within a preset value range.

4. The overcharge detection method according to claim 3, characterized in that: The preset value range is determined based on voltage data collected when valves of each test battery cell having the same specification as the battery cell are opened.

5. The overcharge detection method according to claim 1, characterized in that: Also includes: When the cell voltage is greater than a preset overcharge cut-off voltage, charging of the battery cell is stopped.

6. The overcharge detection method according to claim 1, characterized in that: The determining whether the battery cell is overcharged based on the valve opening detection result includes: When the explosion-proof valve is open, determining that the battery cell is overcharged; When the explosion-proof valve is not opened, it is determined that the battery cell is not overcharged.

7. The overcharge detection method according to claim 1, characterized in that: The battery cell further includes an air pressure sensor, which is used to detect the air pressure in the battery cell. The determining whether the battery cell is overcharged based on the valve opening detection result includes: Based on the gas pressure and the valve opening detection result, it is determined whether the battery cell is overcharged.

8. The overcharge detection method according to claim 7, characterized in that: The determining whether the battery cell is overcharged based on the air pressure and the valve opening detection result includes: When the air pressure is greater than a preset air pressure, or when the air pressure is greater than a preset air pressure and the explosion-proof valve is open, it is determined that the battery cell is overcharged.

9. An overcharge detection device, characterized in that: Used to detect overcharge of energy storage equipment, the energy storage equipment includes a battery cell, the battery cell includes a battery core and an explosion-proof valve, the device includes: An acquisition module, used for acquiring the cell voltage of the battery cell; A valve opening detection module, used for performing valve opening detection on the battery cell based on a preset valve opening determination condition and the cell voltage to obtain a valve opening detection result; A determination module is used to determine whether the battery cell is overcharged based on the valve opening detection result.

10. An electronic device, characterized in that: include: A memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor implements the overcharge detection method according to any one of claims 1 to 8 when executing the program.

11. A non-transitory computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the overcharge detection method as described in any one of claims 1 to 8 is implemented.

12. A computer program product, characterized in that It comprises a computer program, which, when executed by a processor, implements the overcharge detection method as described in any one of claims 1 to 8.

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