Lithium ion battery pulse discharge performance detection method and system

Abstract

The invention relates to the technical field of battery evaluation, and provides a lithium ion battery pulse discharge performance detection method and system, and the method comprises the steps: obtaining the pulse discharge current of a to-be-detected battery at a first temperature and the corresponding duration; the pulse discharge current comprises the discharge current in the pulse discharge application process of the electronic equipment of the to-be-detected battery, and comprises pulse peak current and pulse low peak current. Then, after the to-be-tested battery at the second temperature is controlled to be discharged to the first electric quantity, the pulse peak current and the pulse low peak current are used for alternately controlling the to-be-tested battery at the first temperature to be discharged repeatedly, and the discharge duration of each time of discharge is constrained by the corresponding duration; and furthermore, in the repeated discharging process, the number of discharging times when the voltage of the battery to be tested is smaller than the shutdown voltage is recorded, the pulse discharging performance of the battery to be tested is determined by taking the number of discharging times as a quantitative index, and the performance of the corresponding pulse discharging application can be accurately obtained.

Description

Technical Field

[0001] The embodiments of the present application relate to the technical field of battery evaluation, and in particular to a method and system for detecting pulse discharge performance of a lithium-ion battery. Background Art

[0002] At present, most electronic devices are powered by lithium-ion batteries. In order to meet the needs of users for thinner and lighter electronic devices and longer battery life, high-voltage electrolytes, high-voltage positive electrodes with coatings, or increasing the amount of positive and negative electrode coatings are often used to meet the high energy density requirements of lithium-ion batteries. However, the above methods will affect the lithium ion Li + transmission, resulting in increased impedance, which easily deteriorates the low-temperature discharge characteristics of the battery.

[0003] Therefore, in order to determine the low-temperature discharge characteristics of lithium-ion batteries, it is usually necessary to test and evaluate the discharge performance of lithium-ion batteries in low-temperature scenarios. However, the existing methods for testing the discharge performance of lithium-ion batteries mainly evaluate the cycle life of lithium-ion batteries in low-temperature environments, which cannot effectively match the pulse discharge performance of lithium-ion batteries, and thus cannot accurately evaluate the performance of some pulse discharge applications that are often run in low-power and low-temperature scenarios (such as taking pictures, making calls, recording, etc.). Summary of the invention

[0004] The embodiments of the present application provide a method and system for detecting the pulse discharge performance of a lithium-ion battery, which are used to solve the problem that existing evaluation methods cannot effectively match the pulse discharge performance of lithium-ion batteries, thereby being able to accurately evaluate the performance of some pulse discharge applications that are often run in low-power and low-temperature scenarios.

[0005] To achieve the above objectives, the embodiments of the present application adopt the following technical solutions:

[0006] In a first aspect, a method for detecting pulse discharge performance of a lithium-ion battery is provided, the method comprising: obtaining a pulse discharge current and a corresponding duration of a battery to be tested at a first temperature; wherein the pulse discharge current is a discharge current during a pulse discharge application of an electronic device including the battery to be tested, and the pulse discharge current comprises a pulse high peak current and a pulse low peak current; the value interval of the first temperature is [-30°C, -5°C]; after controlling the battery to be tested at a second temperature to discharge to a first charge, the battery to be tested at the first temperature is repeatedly discharged by alternately controlling the pulse high peak current and the pulse low peak current, and the duration of each discharge is constrained by the corresponding duration; wherein the value interval of the second temperature is [15°C, 25°C]; the value interval of the first charge is [5%C1, 35%C1], and C1 represents the battery capacity of the battery to be tested.

[0007] In low-temperature and low-power scenarios, whether the battery performance is excellent mainly depends on how long it can supply power. Therefore, the first aspect is to control the low-power battery to be tested to discharge repeatedly with a pulse discharge current in a low-temperature scenario. Then, during the repeated discharge process, the number of discharges recorded when the voltage is less than the shutdown voltage is recorded. The number of discharges is a quantitative indicator of how long the battery to be tested can run in a low-temperature and low-power scenario. Based on the number of discharges, the pulse discharge performance of the battery can be accurately evaluated, and the performance of the corresponding pulse discharge application in a low-power and low-temperature scenario can be accurately determined.

[0008] In a possible implementation of the first aspect, obtaining a pulse discharge current and a corresponding duration of a battery to be tested at a first temperature includes: obtaining a pulse discharge current curve of the battery to be tested at the first temperature; wherein the pulse discharge current curve is a current curve detected during a pulse discharge application of an electronic device powered by the battery to be tested; calculating an average value of a high peak current in the pulse discharge current curve as a pulse high peak current, and taking a duration of the high peak current as a duration corresponding to the pulse high peak current; calculating an average value of a low peak current in the pulse discharge current curve as a pulse low peak current, and taking a duration of the low peak current as a duration corresponding to the pulse low peak current.

[0009] In this implementation, since the pulse discharge is continuous when the pulse discharge application is running, the high and low peaks generally do not appear only once, so the corresponding pulse high peak current and pulse low peak current can be accurately obtained by calculating the average value of the high and low peaks from the collected pulse discharge current curve.

[0010] In another possible implementation of the first aspect, during repeated discharge, the number of discharges when the voltage of the battery to be tested is less than the shutdown voltage is recorded, including: during repeated discharge, detecting the voltage of the battery to be tested during each discharge; comparing each detected voltage with the shutdown voltage of the battery to be tested; when the voltage is less than the shutdown voltage for a consecutive preset number of times, calculating the difference between the current number of repeated discharges and the preset number, to obtain the number of discharges when the voltage of the battery to be tested is less than the shutdown voltage.

[0011] In this implementation, by recording the number of discharges when it is determined that the voltage is less than the shutdown voltage for consecutive times, the number of discharges in the shutdown state can be accurately obtained, thereby ensuring the accuracy of the quantitative index.

[0012] In another possible implementation of the first aspect, the battery capacity detection method includes: at a second temperature, based on the battery discharge limit voltage and standard discharge current of the battery to be tested, controlling the battery to be tested to discharge once, and after the discharge control is completed and the battery to be tested is placed for a preset time, controlling the battery to be tested to charge once based on the battery charge limit voltage and standard charge current of the battery to be tested; after the charge control is completed and the battery to be tested is placed for a preset time, controlling the battery to be tested to discharge once again based on the battery discharge limit voltage and standard discharge current of the battery to be tested, and recording the discharge capacity of the battery to be tested this time as the battery capacity of the battery to be tested. In this implementation, by discharging the battery to be tested after charging it, and recording the discharge capacity after charging as the battery capacity, the actual battery capacity of the battery to be tested can be accurately obtained.

[0013] In another possible implementation of the first aspect, controlling a battery to be tested at a second temperature to discharge to a first power level includes: controlling the battery to be tested to perform a charge based on a battery charging limit voltage and a standard charging current of the battery to be tested; after the charging control is completed and the battery to be tested is left for a preset time, controlling the battery to be tested to discharge with a standard discharge current of the battery to be tested until the power level of the battery to be tested drops to the first power level.

[0014] In a second aspect, the present application provides a lithium-ion battery pulse discharge performance detection system, comprising: a low-temperature constant temperature box, an electronic oscilloscope, and a battery charge and discharge test device; wherein the temperature of the low-temperature constant temperature box is maintained at a first temperature, and the value range of the first temperature is [-30°C, -5°C];

[0015] The electronic oscilloscope is used to collect the pulse discharge current curve of the battery to be tested; wherein the battery to be tested is connected to the electronic device and placed in a low-temperature constant temperature box, and the electronic oscilloscope collects the discharge current of the battery to be tested when the electronic device runs the pulse discharge application to obtain the pulse discharge current curve;

[0016] The battery charge and discharge test device is used to obtain a pulse discharge current and a corresponding duration according to a pulse discharge current curve, wherein the pulse discharge current includes a pulse high peak current and a pulse low peak current; after controlling a battery to be tested at a second temperature to discharge to a first power, the battery to be tested in a low-temperature constant temperature box is repeatedly discharged by alternately controlling the pulse high peak current and the pulse low peak current, wherein the duration of each discharge is constrained by the corresponding duration; wherein the value interval of the second temperature is [15°C, 25°C]; the value interval of the first power is [5%C1, 35%C1], and C1 represents the battery capacity of the battery to be tested; during the repeated discharge process, the number of discharges when the voltage of the battery to be tested is less than the shutdown voltage is recorded, and the pulse discharge performance of the battery to be tested is determined according to the number of discharges.

[0017] In another possible implementation of the second aspect, the battery charge and discharge testing device is also used to calculate the average value of the high peak current in the pulse discharge current curve as the pulse high peak current, and use the duration of the high peak current as the duration corresponding to the pulse high peak current; calculate the average value of the low peak current in the pulse discharge current curve as the pulse low peak current, and use the duration of the low peak current as the duration corresponding to the pulse low peak current.

[0018] In another possible implementation of the second aspect, the battery charge and discharge test device is further used to detect the voltage of the battery to be tested during each discharge during repeated discharge; compare each detected voltage with the shutdown voltage of the battery to be tested; when the voltage is less than the shutdown voltage for a consecutive preset number of times, calculate the difference between the current number of repeated discharges and the preset number, and obtain the number of discharges when the voltage of the battery to be tested is less than the shutdown voltage.

[0019] In another possible implementation of the second aspect, the battery charge and discharge test device is further used to control the battery to be tested to discharge once at a second temperature based on the battery discharge limit voltage and the standard discharge current of the battery to be tested, and after the discharge control is completed and the battery to be tested is placed for a preset time, control the battery to be tested to charge once based on the battery charge limit voltage and the standard charge current of the battery to be tested; after the charge control is completed and the battery to be tested is placed for a preset time, control the battery to be tested to discharge once again based on the battery discharge limit voltage and the standard discharge current of the battery to be tested, and record the discharge capacity of the battery to be tested this time as the battery capacity of the battery to be tested.

[0020] In another possible implementation of the second aspect, the battery charge and discharge testing device is further used to control the battery to be tested to perform a charge based on the battery charging limit voltage and the standard charging current of the battery to be tested; after the charging control is completed and the battery to be tested is placed on hold for a preset time, the battery to be tested is controlled to discharge with the standard discharge current of the battery to be tested until the power of the battery to be tested drops to a first power.

[0021] In a third aspect, the present application provides a battery charge and discharge test device, comprising: one or more processors and a memory, the memory being coupled to the processor; one or more computer program codes are stored in the memory, the computer program code comprising computer instructions; when the processor executes the computer instructions, the electronic device performs the following steps:

[0022] In a possible implementation of the third aspect, when the above-mentioned computer instructions are executed by the processor, the electronic device further performs the following steps: obtaining a pulse discharge current and a corresponding duration of the battery to be tested at a first temperature; wherein the pulse discharge current is a discharge current during a pulse discharge application of an electronic device including the battery to be tested, and the pulse discharge current includes a pulse high peak current and a pulse low peak current; the value range of the first temperature is [-30°C, -5°C]; after controlling the battery to be tested at a second temperature to discharge to a first charge, the battery to be tested at the first temperature is repeatedly discharged by alternately controlling the pulse high peak current and the pulse low peak current, and the duration of each discharge is constrained by the corresponding duration; wherein the value range of the second temperature is [15°C, 25°C]; the value range of the first charge is [5%C1, 35%C1], and C1 represents the battery capacity of the battery to be tested.

[0023] In a possible implementation of the third aspect, when the above-mentioned computer instructions are executed by the processor, the electronic device further performs the following steps: obtaining a pulse discharge current curve of the battery to be tested at a first temperature; wherein the pulse discharge current curve is a current curve detected during a pulse discharge application of an electronic device powered by the battery to be tested; calculating the average value of the high peak current in the pulse discharge current curve as the pulse high peak current, and taking the duration of the high peak current as the duration corresponding to the pulse high peak current; calculating the average value of the low peak current in the pulse discharge current curve as the pulse low peak current, and taking the duration of the low peak current as the duration corresponding to the pulse low peak current.

[0024] In a possible implementation of the third aspect, when the above-mentioned computer instructions are executed by the processor, the electronic device further performs the following steps: in the process of repeated discharge, the voltage of the battery to be tested is detected each time it is discharged; each detected voltage is compared with the shutdown voltage of the battery to be tested; when the voltage is less than the shutdown voltage for a preset number of consecutive times, the difference between the current number of repeated discharges and the preset number of times is calculated to obtain the number of discharges when the voltage of the battery to be tested is less than the shutdown voltage. Therefore, by recording the number of discharges when it is determined that the voltage is less than the shutdown voltage for consecutive times, the number of discharges in the shutdown state can be accurately obtained, thereby ensuring the accuracy of the quantitative index.

[0025] In a possible implementation of the third aspect, when the above-mentioned computer instructions are executed by the processor, the electronic device further performs the following steps: at the second temperature, the battery to be tested is controlled to discharge once based on the battery discharge limit voltage and standard discharge current of the battery to be tested, and after the discharge control is completed and the battery to be tested is placed for a preset time, the battery to be tested is controlled to charge once based on the battery charge limit voltage and standard charge current of the battery to be tested; after the charge control is completed and the battery to be tested is placed for a preset time, the battery to be tested is controlled to discharge once again based on the battery discharge limit voltage and standard discharge current of the battery to be tested, and the discharge capacity of the battery to be tested this time is recorded as the battery capacity of the battery to be tested. In this implementation, by discharging the battery to be tested after charging it, and recording the discharge capacity after charging as the battery capacity, the actual battery capacity of the battery to be tested can be accurately obtained.

[0026] In a possible implementation of the third aspect, when the above-mentioned computer instructions are executed by the processor, the electronic device further performs the following steps: controlling the battery to be tested to perform a charge based on the battery charging limit voltage and the standard charging current of the battery to be tested; after the charging control is completed and the battery to be tested is left for a preset time, controlling the battery to be tested to discharge with the standard discharge current of the battery to be tested until the power of the battery to be tested drops to the first power.

[0027] In a fourth aspect, the present application provides a computer-readable storage medium having a computer program stored thereon. When the computer program is executed by a processor in an electronic device, a battery charge and discharge testing device executes a lithium-ion battery pulse discharge performance detection method as in the first aspect and any possible design thereof.

[0028] In a fifth aspect, the present application provides a computer program product, which, when executed on a computer, enables the computer to execute the method of the first aspect and any possible design thereof. The computer may be the battery charge and discharge test device described above.

[0029] It can be understood that the beneficial effects that can be achieved by the battery charge and discharge testing device of any possible design of the third aspect, the computer-readable storage medium of the fourth aspect, and the computer program product of the fifth aspect can be referred to as the beneficial effects in the first aspect and any possible design of the battery charge and discharge testing device, and will not be repeated here. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 A schematic diagram of a lithium-ion battery pulse discharge performance detection method provided in an embodiment of the present application Figure 1 ;

[0031] Figure 2 A schematic diagram of the structure of an electronic device provided in an embodiment of the present application;

[0032] Figure 3 A schematic diagram of a lithium-ion battery pulse discharge performance detection method provided in an embodiment of the present application Figure 2 ;

[0033] Figure 4 A schematic diagram of a pulse discharge current curve for a photographing application provided in an embodiment of the present application;

[0034] Figure 5 A schematic diagram of a curve showing the relationship between shutdown voltage and discharge times provided in an embodiment of the present application;

[0035] Figure 6 A schematic diagram of a lithium-ion battery pulse discharge performance detection system provided in an embodiment of the present application. DETAILED DESCRIPTION

[0036] The technical scheme of the embodiment of the present application will be described below in conjunction with the accompanying drawings of the embodiment of the present application. Among them, in the description of the embodiment of the present application, the terms used in the following embodiments are only for the purpose of describing specific embodiments, and are not all intended to limit the present application. In addition, in the description of the embodiment of the present application, unless otherwise specified, the meaning of "multiple" means two or more.

[0037] Lithium-ion battery is a secondary battery (rechargeable battery) that mainly relies on the movement of lithium ions between the positive electrode and the negative electrode to work. + When charging, lithium ions Li + It is deintercalated from the positive electrode and then intercalated into the negative electrode through the electrolyte. At this time, the negative electrode is in a lithium-rich state. + It is deintercalated from the negative electrode and then intercalated into the positive electrode through the electrolyte, and the positive electrode is in a lithium-rich state.

[0038] At present, most electronic devices, such as mobile phones, tablet computers, and laptops, are powered by lithium-ion batteries. In order to meet users' demand for thinner and lighter electronic devices and longer battery life, high-voltage electrolytes, coated high-voltage positive electrodes, or increased positive and negative electrode coating amounts are often used to meet the high energy density requirements of lithium-ion batteries.

[0039] However, no matter which of the above methods is used, it will affect the lithium ion Li + The transmission of power leads to increased impedance, which easily deteriorates the low-temperature discharge characteristics of the battery. The deterioration of the low-temperature discharge characteristics of the battery can easily affect the user experience of electronic devices. Therefore, in order to judge the low-temperature discharge characteristics of lithium-ion batteries, when performing performance tests on lithium-ion batteries, the discharge performance of lithium-ion batteries is usually evaluated in low-temperature and low-power scenarios.

[0040] The existing national standard lithium-ion battery low-temperature discharge performance evaluation method is mainly a low-temperature discharge -10 degree test. That is, after the battery (cell) to be tested is quickly discharged, it is left for 5 minutes, charged at 0.2C, and then left for 5 minutes, discharged at 0.2C, and the discharge capacity is recorded as the normal temperature capacity. Then, under normal temperature conditions, the battery to be tested is charged at 0.2C, left for 2 hours at -10±2℃, and then discharged at 0.2C. After the experiment, the battery to be tested is left for another 2 hours, and finally the appearance of the battery to be tested is visually inspected for obvious defects, such as leakage, pressure relief, fire, rupture, explosion, etc. And, it is judged whether the discharge capacity is not less than 70% of the normal temperature capacity, so as to evaluate the discharge performance of the battery to be tested in the low temperature and low power scenario based on these two conditions. In addition, there are some existing parameters to evaluate the performance of the battery by the ratio of the discharge capacity to the initial discharge capacity, the nC rate of the battery, and the low temperature internal resistance of the battery. Among them, n represents the multiple, and C represents the ampere-hour of the capacity.

[0041] It can be seen that the above evaluation methods are mainly to evaluate the charge and discharge cycle performance of the battery in a low-temperature environment, which is equivalent to evaluating the cycle life of the lithium-ion battery in a low-temperature environment. However, for some pulse discharge applications in electronic devices that often operate in low-power and low-temperature scenarios, since the discharge method of these pulse discharge applications is pulse discharge when they are running, if you want to evaluate their performance in low-power and low-temperature scenarios, you should evaluate the pulse discharge performance of the lithium-ion battery that powers the electronic device in low-power and low-temperature scenarios. However, the existing evaluation methods evaluate the charge and discharge cycle performance of lithium-ion batteries, which cannot effectively match the pulse discharge performance of lithium-ion batteries. Therefore, the existing evaluation cannot accurately evaluate the performance of these pulse discharge applications in low-power and low-temperature scenarios. For example, it is impossible to accurately evaluate the performance of pulse discharge applications such as taking pictures, making calls and recording in low-power and low-temperature scenarios.

[0042] In order to solve the above problems, an embodiment of the present application provides a lithium-ion battery pulse discharge performance detection method, which can be applied to a battery charge and discharge test device.

[0043] Since most of the applications such as taking pictures, making calls and recording that are often run in low-battery and low-temperature scenarios are pulse discharge applications. Among them, pulse discharge applications refer to pulse discharge applications, that is, applications that can intermittently produce voltage or current during operation, and are generally applications that can suddenly produce intermittent and short-duration electrical signals. For example, a photo-taking application suddenly generates an electrical signal during the period of taking a picture in response to a user's click operation, and a call application generates an electrical signal during a conversation (making a sound). Therefore, the embodiments of the present application are mainly based on the pulse discharge current of the pulse discharge application to realize the detection of the pulse discharge performance of the battery to be tested, and then the pulse discharge performance can be used to characterize the performance of the corresponding pulse discharge application.

[0044] Below, taking the battery charge and discharge test device as an example, combined with Figure 1 The lithium-ion battery pulse discharge performance detection method provided in the embodiment of the present application is described.

[0045] Specifically, first, the battery charge and discharge test device obtains the pulse discharge current and the corresponding duration of the battery to be tested at the first temperature. Among them, the first temperature is the ambient temperature set to make the battery to be tested in a low temperature scene, and its value range is [-30℃,-5℃]. The pulse discharge current is the discharge current detected during the pulse discharge application of the electronic device including the battery to be tested, which includes the pulse peak current and the pulse low peak current. The duration includes the duration corresponding to the pulse peak current and the duration corresponding to the pulse low peak current. For example, the pulse discharge current curve during the operation of the pulse discharge application can be collected by an electronic oscilloscope, and then the pulse discharge current and the corresponding duration are obtained from the pulse discharge current curve and input into the battery charge and discharge test device. The pulse discharge current curve can also be directly input to the battery charge and discharge test device, and the battery charge and discharge test device can obtain the pulse discharge current and the corresponding duration from the pulse discharge current curve by itself.

[0046] Then, after the battery charge and discharge test device controls the battery to be tested at the second temperature to discharge to the first power, the battery to be tested at the first temperature is repeatedly discharged by alternating pulse high-peak current and pulse low-peak current. Moreover, the discharge duration of each discharge during the repeated discharge process is constrained by the corresponding duration. In other words, when the pulse high-peak current is used to control the discharge of the battery to be tested, its discharge duration is the duration corresponding to the pulse high-peak current. Similarly, when the pulse low-peak current is used to control the discharge of the battery to be tested, its discharge duration is the duration corresponding to the pulse low-peak current. Among them, the first power is a power value that characterizes low power. By controlling the battery to be tested to discharge to the first power, the battery to be tested can be in a low-power state, thereby meeting the detection requirements for detecting pulse discharge performance in a low-power scenario.

[0047] The remaining power of the battery is usually represented by a percentage, and the battery capacity can generally represent the total power of the battery. Therefore, the first power can be obtained by the percentage value of the battery capacity. In addition, based on the actual application and lithium-ion batteries of different chemical systems, the value of the low power will vary, generally 5% to 35% of the total power. Therefore, the value range of the first power is [5%C1, 35%C1].

[0048] At the same time, in order to make the battery accurately present a low power state without being affected by other conditions, the battery charge and discharge test device controls the battery to be tested to discharge to the first power level, and the battery to be tested is at a second temperature representing a normal temperature environment, and its value range is [15°C, 25°C]. That is to say, the battery to be tested is placed in a normal temperature environment, and the battery charge and discharge test device controls the battery to be tested to discharge until the power level of the battery to be tested drops to a low power level (the first power level), so that the battery to be tested is in a low power state.

[0049] Finally, in the process of controlling the battery to be tested to repeatedly discharge, the battery charge and discharge test device synchronously detects and records the voltage of the battery to be tested after each discharge. When the voltage of the battery to be tested is less than the shutdown voltage (equivalent to the battery to be tested being exhausted, and the electronic device powered by the battery to be tested is in the shutdown state), the current number of discharges is recorded. Then, the pulse discharge performance of the battery to be tested is determined according to the number of discharges. Among them, since the battery to be tested is at a first temperature (low temperature environment) and the current power is the first power (low power state) during the repeated discharge process, the current repeated discharge scenario meets the conditions of the low temperature and low power scenario. Therefore, the more discharge times, the longer the battery to be tested can run in the low power and low temperature scenario, and the better its pulse discharge performance. And the fewer discharge times, the shorter the time the battery to be tested can run in the low power and low temperature scenario, and the worse its pulse discharge performance.

[0050] In summary, the pulse discharge performance of the embodiment of the present application is obtained by repeated discharge detection of the battery to be tested in a low-battery and low-temperature scenario based on the pulse discharge current of the pulse discharge application. Therefore, the pulse discharge performance finally determined is effectively matched with the performance of the pulse discharge application corresponding to the pulse discharge current. In other words, when the pulse discharge application corresponding to the pulse discharge current is a photo-taking application, the determined pulse discharge performance is equivalent to the photo-taking performance of the electronic device in a low-battery and low-temperature scenario. Similarly, when the pulse discharge application corresponding to the pulse discharge current model is a call or recording application, the determined pulse discharge performance is the call or recording performance of the electronic device in a low-battery and low-temperature scenario.

[0051] It can be seen that the embodiment of the present application first repeatedly discharges the low-power battery under test with a pulse discharge current in a low-temperature scenario. Then, the number of discharges recorded when the battery voltage is less than the shutdown voltage is used as a quantitative indicator to determine its discharge performance, thereby being able to effectively and accurately evaluate the pulse discharge performance of the battery under test in a low-power and low-temperature scenario, and then accurately determine the performance of some pulse discharge applications that are often run in low-power and low-temperature scenarios.

[0052] Exemplarily, the battery charge and discharge test device described in the embodiment of the present application can be any existing instrument capable of controlling the charge and discharge of a lithium-ion battery. The electronic device is powered by a lithium-ion battery and can run pulse discharge applications (such as taking pictures, talking, recording, etc.), and can include at least one of a mobile phone, a camera, a video camera, a tablet computer, a foldable electronic device, a desktop computer, a handheld computer, a laptop computer, and a super mobile personal computer. The embodiment of the present application does not impose any special restrictions on the specific type of the electronic device.

[0053] like Figure 2 As shown, an embodiment of the present application provides a structural schematic diagram of an electronic device 100.

[0054] The electronic device 100 may include a processor 110, an external memory interface 120, an internal memory 121, a universal serial bus (USB) connector 130, a charging management module 140, a power management module 141, a lithium-ion battery 142, an antenna 1, an antenna 2, a mobile communication module 150, a wireless communication module 160, an audio module 170, a speaker 170A, a receiver 170B, a microphone 170C, an earphone interface 170D, a sensor module 180, a button 190, a motor 191, an indicator 192, a camera module 193, a display screen 194, and a subscriber identification module (SIM) card interface 195, etc.

[0055] The processor 110 may include one or more processing units, such as an application processor (AP), a modem processor, a graphics processor (GPU), an image signal processor (ISP), a controller, a video codec, a digital signal processor (DSP), a baseband processor, and / or a neural-network processing unit (NPU). A memory may also be provided in the processor 110, and the memory may be a high-speed cache memory for storing instructions and data. The processor 110 may include one or more interfaces, and modules such as a touch sensor, an audio module, a wireless communication module, a display, and a camera may be connected through the interface.

[0056] The external memory interface 120 can be used to connect an external memory card, such as a Micro SD card, to expand the storage capacity of the electronic device 100. The external memory card communicates with the processor 110 through the external memory interface 120 to implement a data storage function. The internal memory 121 can be used to store computer executable program code, which includes instructions. The internal memory 121 may include a program storage area and a data storage area. Among them, the program storage area may store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc. The data storage area may store data created during the use of the electronic device 100 (such as audio data, a phone book, etc.), etc.

[0057] The USB connector 130 is an interface that complies with USB standard specifications and can be used to connect the electronic device 100 and peripheral devices. Specifically, it can be a Mini USB connector, a Micro USB connector, a USB Type C connector, etc.

[0058] The charging management module 140 is used to receive charging input from a charger, where the charger can be a wireless charger or a wired charger.

[0059] The power management module 141 is used to connect the lithium-ion battery 142, the charging management module 140 and the processor 110. The power management module 141 receives input from the lithium-ion battery 142 and / or the charging management module 140 to power the processor 110, the internal memory 121, the display screen 194, the camera module 193, and the wireless communication module 160.

[0060] The wireless communication function of the electronic device 100 can be implemented by antenna 1, antenna 2, mobile communication module 150, wireless communication module 160, modulation and demodulation processor and baseband processor. Among them, antenna 1 and antenna 2 are used to transmit and receive electromagnetic wave signals. The mobile communication module 150 can provide solutions for wireless communication including 2G / 3G / 4G / 5G applied to the electronic device 100. The wireless communication module 160 can provide solutions for wireless communication including wireless local area networks (WLAN) (such as wireless fidelity (Wi-Fi) network), bluetooth (bluetooth, BT), bluetooth low energy (bluetooth low energy, BLE), ultra wideband (ultra wideband, UWB), global navigation satellite system (global navigation satellite system, GNSS), frequency modulation (frequency modulation, FM), near field communication technology (near field communication, NFC), infrared technology (infrared, IR) and the like applied to the electronic device 100. The modulation and demodulation processor may include a modulator and a demodulator. The modulator is used to modulate the low-frequency baseband signal to be sent into a medium-high frequency signal. The demodulator is used to demodulate the received electromagnetic wave signal into a low-frequency baseband signal. The demodulator then transmits the demodulated low-frequency baseband signal to the baseband processor for processing. After the low-frequency baseband signal is processed by the baseband processor, it is transmitted to the application processor. The application processor outputs a sound signal through an audio device (not limited to a speaker 170A, a receiver 170B, etc.), or displays an image or video through a display screen 194.

[0061] The electronic device 100 can implement audio functions such as music playing and recording through the audio module 170, the speaker 170A, the receiver 170B, the microphone 170C, the headphone jack 170D, and the application processor.

[0062] The sensor module 180 may include a pressure sensor 180A, a gyroscope sensor 180B, an air pressure sensor 180C, a magnetic sensor 180D, an acceleration sensor 180E, a distance sensor 180F, a proximity light sensor 180G, a fingerprint sensor 180H, a temperature sensor 180J, a touch sensor 180K, an ambient light sensor 180L, a bone conduction sensor 180M, and the like.

[0063] The key 190 may include a power key, a volume key, etc. The key 190 may be a mechanical key or a touch key. The electronic device 100 may receive key input and generate key signal input related to user settings and function control of the electronic device 100.

[0064] Motor 191 can generate vibration prompts. Motor 191 can be used for incoming call vibration prompts, and can also be used for touch vibration feedback. For example, touch operations acting on different applications (such as taking pictures, audio playback, etc.) can correspond to different vibration feedback effects.

[0065] Indicator 192 may be an indicator light, which may be used to indicate charging status, power changes, messages, missed calls, notifications, etc.

[0066] The electronic device 100 can realize the camera function through the camera module 193, ISP, video codec, GPU, display screen 194, application processor AP, neural network processor NPU, etc. Among them, the camera module 193 can be used to collect color image data and depth data of the photographed object. The ISP can be used to process the color image data collected by the camera module 193. For example, when taking a photo, the shutter is opened, and the light is transmitted to the camera photosensitive element through the lens, and the light signal is converted into an electrical signal. The camera photosensitive element transmits the electrical signal to the ISP for processing and converts it into an image visible to the naked eye. The ISP can also perform algorithm optimization on the noise, brightness, and skin color of the image. The ISP can also optimize the exposure, color temperature and other parameters of the shooting scene. In some embodiments, the ISP can be set in the camera module 193. In some embodiments, the electronic device 100 may include one or more camera modules 193, such as one front camera module 193 and one rear camera module 193. The camera module 193 can also be composed of two or more cameras. The video codec is used to compress or decompress digital video. The electronic device 100 may support one or more video codecs. The NPU is a neural network (NN) computing processor that quickly processes input information by drawing on the structure of biological neural networks, such as the transmission mode between neurons in the human brain, and can also continuously self-learn.

[0067] The SIM card interface 195 is used to connect a SIM card. The SIM card can be connected to and separated from the electronic device 100 by inserting it into the SIM card interface 195 or pulling it out from the SIM card interface 195. The electronic device 100 can support one or more SIM card interfaces. The SIM card interface 195 can support Nano SIM cards, Micro SIM cards, SIM cards, etc. Multiple cards can be inserted into the same SIM card interface 195 at the same time. The types of multiple cards can be the same or different. The SIM card interface 195 can also be compatible with different types of SIM cards. The SIM card interface 195 can also be compatible with external memory cards. The electronic device 100 interacts with the network through the SIM card to realize functions such as calls and data communications. In some embodiments, the electronic device 100 uses an eSIM, i.e., an embedded SIM card. The eSIM card can be embedded in the electronic device 100 and cannot be separated from the electronic device 100.

[0068] It is to be understood that the structure illustrated in the embodiment of the present application does not constitute a specific limitation on the electronic device 100. In other embodiments of the present application, the electronic device 100 may include more or fewer components than shown in the figure, or combine some components, or split some components, or arrange the components differently. The components shown in the figure may be implemented in hardware, software, or a combination of software and hardware.

[0069] like Figure 3 As shown, the present application embodiment provides a flow chart of a method for detecting pulse discharge performance of a lithium-ion battery. Figure 3 The lithium-ion battery pulse discharge performance detection method of the present application embodiment is explained in detail. Figure 3 The lithium-ion battery pulse discharge performance detection method of the embodiment of the present application includes steps S301-S305.

[0070] S301, obtaining a pulse discharge current curve of a battery to be tested at a first temperature; wherein the pulse discharge current curve is a current curve detected during a pulse discharge application of an electronic device powered by the battery to be tested.

[0071] The battery to be tested refers to a lithium-ion battery that needs to be tested for pulse discharge performance. The pulse discharge current curve is the discharge current curve when the pulse discharge application is running, which is obtained by collecting the discharge current when the pulse discharge application is running in an electronic device (such as a mobile phone). Pulse discharge applications refer to applications in which the discharge method is pulsed, such as taking pictures, making calls, recording, etc.

[0072] Specifically, the pulse discharge current curve of the embodiment of the present application is collected by an electronic oscilloscope. First, the battery to be tested is connected to the electronic oscilloscope and the electronic device respectively and then placed at a first temperature. For example, after the battery to be tested is connected to the electronic oscilloscope through a lead, the battery to be tested is installed in the electronic device, and the electronic device with the battery to be tested installed is placed in an environment corresponding to the first temperature. Then, the pulse discharge application in the electronic device is operated at the first temperature to run it. During the operation of the pulse discharge application, the electronic oscilloscope collects the discharge current of the battery to be tested in real time to obtain a pulse discharge current curve.

[0073] Afterwards, the collected pulse discharge current curve can be directly transmitted to the battery charge and discharge test device by an electronic oscilloscope, or the pulse discharge current curve can be manually input into the battery charge and discharge test device. Thus, the battery charge and discharge test device obtains the pulse discharge current curve of the battery to be tested in a low temperature environment.

[0074] Exemplarily, taking the electronic device as a mobile phone and the pulse discharge application as a photo application as an example, the process of collecting the pulse discharge current using an electronic oscilloscope is as follows: first, the battery to be tested is installed in the mobile phone, and the battery to be tested is used to power the mobile phone. At the same time, the battery to be tested is connected to the electronic oscilloscope through a lead. Then, the mobile phone connected to the battery to be tested is placed in a low temperature environment for a period of time, and the low temperature environment can be achieved by a low temperature constant temperature box. For example, the mobile phone connected to the battery to be tested is placed in a low temperature constant temperature box with a first temperature of K℃ and left for t1min (minutes). Then, the camera application of the mobile phone is turned on in the low temperature constant temperature box, and manual continuous photos are taken n0 times, each time at an interval of t2s (seconds). In this process, the electronic oscilloscope synchronously collects the battery discharge current curve, that is, the pulse discharge current curve is collected. Among them, A, t1, n0 and t2 are set based on actual evaluation requirements. The value interval of K at the first temperature is [-30℃, -5℃]. The value interval of t1 can be [30, 120], and the value interval of t1 in the embodiment of the present application is [30, 60]. The value range of n0 can be [5, 20]. In the embodiment of the present application, the value range of n0 is [5, 10]. The value range of t2 can be [1, 4]. In the embodiment of the present application, the value range of t2 is [1.5, 2.5].

[0075] like Figure 4 As shown, a schematic diagram of a pulse discharge current curve for a camera application is provided. Since the pulse discharge current curve is the discharge current curve detected when the pulse discharge application is running, the pulse discharge current curve can be regarded as a power consumption model of a pulse discharge application in an electronic device (such as a camera application in a mobile phone). In this way, a power consumption model library of pulse discharge applications for different mobile phones and different lithium-ion batteries can be pre-established, and the subsequent battery charge and discharge test device can directly obtain the corresponding pulse discharge current curve in the power consumption model library.

[0076] It should be understood that the acquisition method of the pulse discharge current curve of other pulse discharge applications is the same as that of the photo taking application, and the only difference is which application is opened in the electronic device when evaluating the pulse discharge application. For example, if the evaluated application is calling or recording, the calling or recording application of the mobile phone is opened in a low temperature environment.

[0077] S302, obtaining a pulse discharge current and a corresponding duration from a pulse discharge current curve, wherein the pulse discharge current includes a pulse high peak current and a pulse low peak current.

[0078] Specifically, after the battery charge and discharge test device obtains the pulse discharge current curve, it decomposes and optimizes the pulse discharge current curve into two parts, from which the pulse high peak current and the pulse low peak current are obtained as the pulse discharge current. At the same time, the durations corresponding to the pulse high peak current and the pulse low peak current are respectively obtained as the durations corresponding to the pulse discharge current.

[0079] Among them, since the working voltage of lithium-ion batteries always changes with the passage of time when they are discharged, the discharge state of the battery under test in different time periods can be determined based on the change state of the voltage-time curve or the current-time curve. Generally, the peak of the current curve represents the discharge period, and the low peak represents the discharge gap period. In other words, the pulse peak current represents the discharge current (discharge current during discharge) when the pulse discharge application suddenly generates an electrical signal, and the pulse low peak current is the discharge current in other periods (discharge current during the discharge gap).

[0080] For example, if the pulse discharge application is taking a photo, the pulse peak current is the discharge current during the photo period (the discharge current during the discharge period), and the pulse low peak current is the discharge current during the photo interval (the discharge current during the discharge interval). If the pulse discharge application is taking a call or recording as an example, the discharge period can be understood as the stage with sound, and the discharge interval period is the stage without sound.

[0081] In some embodiments, during the operation of the pulse discharge application, the pulse discharge current curve is continuous, that is, the high peak current and the low peak current generally do not appear only once. Therefore, S302 may include: calculating the average value of the high peak current of the pulse discharge current curve as the pulse high peak current, and taking the duration of the high peak current as the duration corresponding to the pulse high peak current; calculating the average value of the low peak current in the pulse discharge current curve as the pulse low peak current, and taking the duration of the low peak current as the duration corresponding to the pulse low peak current.

[0082] Specifically, after obtaining the pulse discharge current curve, the battery charge and discharge test device can directly determine its high peak current and low peak current from the pulse discharge current curve. Then, the average value of the high peak current and the average value of the low peak current are calculated as the pulse high peak current and the pulse low peak current. The high peak and low peak of the pulse discharge current curve can be referred to Figure 4 In the embodiment of the present application, the pulse discharge current and the corresponding duration can be expressed as:

[0083] at3+bt4.

[0084] Among them, a represents the average value of the peak current (pulse peak current), and b represents the average value of the low peak current (pulse low peak current), both in units of current A. t3 represents the duration of the peak current, and t4 represents the duration of the low peak current, both in units of seconds. a, b, t3, and t4 are generally related to the hardware of the corresponding pulse discharge application. Taking the photo application as an example, a, b, t3, and t4 are mainly affected by the system chip and camera model. The a and b of the photo application are generally between 0.1 and 2, and t3 and t4 are generally between 0.5 and 2.

[0085] S303, controlling the battery to be tested at the second temperature to discharge to a first power level.

[0086] Among them, the second temperature refers to the temperature under normal temperature environment, and the value range of the second temperature in the embodiment of the present application is [15℃, 25℃]. The first power refers to the power value used to characterize that the battery is in a low power state. The power values ​​used to characterize low power in different lithium-ion batteries may vary, so the specific value of the first power of the battery to be tested in the embodiment of the present application is based on the actual battery capacity. The value range of the first power in the embodiment of the present application is [5%C1, 35%C1], where C1 is the battery capacity of the battery to be tested.

[0087] Specifically, in order to meet the low temperature and low power scene detection conditions, it is necessary to ensure that the battery to be tested is in a low power state. Therefore, in addition to obtaining the pulse discharge current, the battery charge and discharge test device also needs to control the battery to be tested to discharge so that it is in a low power state. That is, under normal temperature environment (second temperature), the battery charge and discharge test device controls the discharge of the battery to be tested with low power (first power) as the constraint condition until the power of the battery to be tested drops to low power (first power).

[0088] In some embodiments, in order to accurately obtain the battery capacity of the battery to be tested to ensure accurate low-power discharge, the battery to be tested may be discharged after being charged, and its discharge capacity may be recorded as the battery capacity. Based on this, the battery capacity detection method may include: at a second temperature, the battery to be tested is controlled to be discharged once based on the battery discharge limit voltage and standard discharge current of the battery to be tested, and after the discharge control is completed and the battery to be tested is placed for a preset time, the battery to be tested is controlled to be charged once based on the battery charge limit voltage and standard charge current of the battery to be tested; after the charge control is completed and the battery to be tested is placed for a preset time, the battery to be tested is again controlled to be discharged once based on the battery discharge limit voltage and standard discharge current of the battery to be tested, and the discharge capacity of the battery to be tested this time is recorded as the battery capacity of the battery to be tested.

[0089] Specifically, under normal temperature environment (second temperature), the battery charge and discharge test device first controls the battery to be tested to discharge to the battery discharge limit voltage V1 with the standard discharge current A1 of the battery to be tested. After the discharge is completed, the battery charge and discharge test device first places the battery to be tested for a preset time, and then controls the battery to be tested to charge to the battery charge limit voltage V2 with the standard charge current A2 of the battery to be tested. After the charging is completed this time, the battery to be tested is also placed for a preset time. Then, the battery to be tested is again controlled to discharge to the battery discharge limit voltage V1 of the battery to be tested based on the standard discharge current A1 of the battery to be tested, and the discharge capacity of the battery is recorded at the same time, and the discharge capacity is used as the battery capacity C1 of the battery to be tested.

[0090] It can be seen that the process of charging and discharging the battery under test can be understood as the battery charging and discharging test device controls the battery under test to discharge with the standard discharge current A1 under the constraint of the battery discharge limit voltage V1. Similarly, under the constraint of the battery charge limit voltage V2, the battery under test is charged with the standard charge current A2.

[0091] Among them, the time for the battery to be tested to be put aside can be set based on the actual situation. The embodiment of the present application refers to the national standard evaluation method, and the shelving time is 5 minutes, that is, the preset time of the embodiment of the present application can be 5 minutes. The standard discharge current A1 and standard charging current A2 of lithium-ion batteries are usually 0.2 times their rated capacity C0. That is, the standard discharge current A1 and standard charging current A2 of the battery to be tested in the embodiment of the present application are both 0.2C0. The battery discharge limit voltage V1 and the battery charge limit voltage V2 are usually different based on different chemical system batteries. For lithium-ion batteries, V1 is generally 3.0V, and V2 has a value range of 4.4V to 4.53V.

[0092] In some embodiments, low-power discharge of the battery under test can also be performed based on the standard charge and discharge current and the battery charge and discharge limit voltage. Therefore, S303 may include: controlling the battery under test to be charged once based on the battery charge limit voltage and the standard charge current of the battery under test; after the charge control is completed and the battery under test is left for a preset time, controlling the battery under test to be discharged with the standard discharge current of the battery under test until the power of the battery under test drops to the first power.

[0093] Specifically, under normal temperature environment, the battery charge and discharge test device first controls the battery to be tested to charge to the battery charge limit voltage V2 with the standard charging current A2. After charging, the battery charge and discharge test device places the battery to be tested for a preset time (for example, 5 minutes) and then controls the battery to be tested to discharge with the standard discharge current A1 of the battery to be tested until the power of the battery to be tested is equal to the first power C2. Among them, the standard discharge current A1 and the standard charging current A2 are also 0.2C0. The value range of the battery charge limit voltage V2 is 4.4V to 4.53V. The value interval of C2 is [5%C1, 35%C1].

[0094] S304, using the pulse high peak current and the pulse low peak current to alternately control the battery under test at the first temperature to discharge repeatedly, and the duration of each discharge is constrained by the corresponding duration.

[0095] S305, during the repeated discharge process, recording the number of discharges when the voltage of the battery to be tested is less than the shutdown voltage, and determining the pulse discharge performance of the battery to be tested according to the number of discharges.

[0096] Specifically, after the battery charge and discharge test device controls the discharge of the battery to be tested to a low power (first power) state at a normal temperature environment (second temperature), the battery to be tested with a low power (first power) can be placed in a low temperature environment (first temperature) for a period of time to enter a low temperature state, so as to meet the performance evaluation scenario of low power and low temperature. For example, the battery to be tested can be placed in a K℃ low temperature thermostat and left for t1min.

[0097] Then, the battery charge and discharge test device repeatedly discharges the battery to be tested placed in a low temperature environment (first temperature) in a pulse manner n1 times based on the acquired pulse discharge current. That is to say, the repeated discharge in the embodiment of the present application is to control the discharge of the battery to be tested alternately by using the pulse high peak current and the pulse low peak current. That is, the battery charge and discharge test device first controls the discharge of the battery to be tested with the pulse high peak current and its corresponding duration, and then controls the discharge of the battery to be tested with the pulse low peak current and its corresponding duration, and discharges the battery to be tested n1 times in an alternating cycle.

[0098] During the repeated discharge process, the battery charge and discharge test device synchronously collects the voltage of the battery to be tested. The battery charge and discharge test device compares the collected voltage with the shutdown voltage V3 corresponding to the battery to be tested. Once it is determined that the collected voltage is less than the shutdown voltage V3, it indicates that the battery to be tested may have been exhausted and is in a shutdown state. In other words, when the voltage of the battery to be tested is less than the shutdown voltage V3, the electronic device connected to the battery to be tested may be in a shutdown state (for example, the mobile phone is shut down due to lack of power). At this time, the battery charge and discharge test device records the number of discharges n2 that have been discharged. That is, in the process of repeated discharge n1 times, the number of times the voltage has been discharged when it is less than the shutdown voltage V3 is recorded as the number of discharges n2. For example, assuming that in the repeated discharge process, when the voltage detected after the 10th discharge is less than the shutdown voltage V3, it means that the battery to be tested has been exhausted after the 10th discharge, and the number of discharges currently recorded is 10 times.

[0099] Among them, the shutdown voltage V3 is different based on different chemical system batteries, and the value range of the shutdown voltage V3 is generally 2.7V~3.0V. For example, the graphite system battery V3=3.0V, and the silicon-carbon system battery V3=2.75V. Therefore, the specific value of the shutdown voltage V3 of the embodiment of the present application is determined according to the actual situation of the battery to be tested. In addition, the value range of n1 can be set according to actual needs, and its value range is generally 100~500. The value range of n1 in the embodiment of the present application is 300~500.

[0100] Finally, the pulse discharge performance of the battery to be tested can be determined according to the number of discharges n2 recorded by the battery charge and discharge test device. Because in the low-temperature and low-power scenario, whether the battery performance is excellent mainly depends on the length of time it can power and operate. Therefore, the number of discharges n2 recorded in the embodiment of the present application is equivalent to a quantitative indicator of the pulse discharge performance of the corresponding lithium-ion battery in the low-power and low-temperature scenario. Simply put, the smaller the number of discharges n2, the shorter the time the battery to be tested runs in the low-power and low-temperature scenario, and the electronic device is prone to shut down due to rapid reduction of power due to low temperature, which means that the pulse discharge performance of the battery to be tested is worse. Conversely, the more discharges n2, the longer the battery to be tested can run in the low-power and low-temperature scenario, and relatively speaking, the low-temperature environment has less influence on its discharge speed, that is, the better the pulse discharge performance of the battery to be tested.

[0101] In some embodiments, in order to ensure that the recorded discharge times n2 can accurately correspond to the shutdown state of the battery to be tested, the voltage can be continuously judged within a certain range. If the collected voltages are continuously judged to be less than the shutdown voltage V3, the discharge times n2 are recorded.

[0102] Therefore, S305 may include: during the repeated discharge process, detecting the voltage of the battery to be tested during each discharge; comparing each detected voltage with the shutdown voltage of the battery to be tested; when the voltage is less than the shutdown voltage for a preset number of consecutive times, calculating the difference between the current number of repeated discharges and the preset number, and obtaining the number of discharges when the voltage of the battery to be tested is less than the shutdown voltage.

[0103] Specifically, when the battery charge and discharge test device repeatedly discharges the low-power battery under low temperature environment for n1 times, the voltage of the battery under test after each discharge is synchronously collected. Then, each collected voltage is compared with the shutdown voltage V3 to determine whether the collected voltage is less than the shutdown voltage V3. If the voltage is less than the shutdown voltage V3 for a preset number of times (n3 times), it means that the battery under test is in a stable shutdown state at this time, and the current discharge number n2 is recorded.

[0104] At this time, the discharge number n2 is the difference between the current repeated discharge number and the preset number n3. For example, assuming n3 = 5, if in the process of repeated discharge n1 times, the voltage collected for 5 consecutive times starting from the 10th time is less than the shutdown voltage V3, that is, the voltage collected for the 10th, 11th, 12th, 13th and 14th times is less than the shutdown voltage V3. At this time, the current number of repeated discharges is 14 times, and the voltage is less than the shutdown voltage V3 starting from the 10th time. In other words, the battery to be tested may have been shut down during the 10th discharge, so the number of discharges before the battery to be tested is n2 = 14-5 = 9.

[0105] The accuracy of voltage acquisition during repeated discharge and the preset number n3 can be set based on actual needs. The accuracy of voltage acquisition during repeated discharge in the embodiment of the present application is 100ms. The value range of the predicted number n3 is generally 1 to 10, and the value range of n3 in the embodiment of the present application is 4 to 6.

[0106] It can be seen that the embodiment of the present application can accurately obtain the number of discharges n2 in the shutdown state by recording the number of discharges n2 when the voltage is determined to be less than the shutdown voltage V3 for multiple consecutive times, thereby ensuring the accuracy of the quantitative indicator.

[0107] In addition, if Figure 5 As shown, an embodiment of the present application provides a curve diagram showing the relationship between shutdown voltage and discharge times. Figure 5 The curve shown is a curve of the relationship between the number of discharges and the voltage. The pulse discharge voltage curve is formed by the voltage synchronously collected by the battery charge and discharge test device during the repeated pulse discharge of the battery to be tested. The battery charge and discharge test device presents the relationship between the voltage and the number of discharges in the form of a curve. The number of discharges n2 when the voltage is less than the shutdown voltage V3 can be directly read from the curve.

[0108] As described above, the lithium-ion battery pulse discharge performance detection method provided in the embodiment of the present application repeatedly discharges the low-battery test battery based on the pulse discharge current when the pulse discharge application is running, and records the number of discharges when the battery voltage is less than the shutdown voltage during this process, and uses the number of discharges as a quantitative indicator to determine the pulse discharge performance of the test battery, thereby being able to effectively and accurately evaluate the pulse discharge performance of the test battery in low-battery and low-temperature scenarios, and further accurately determine the performance of some pulse discharge applications that are often run in low-battery and low-temperature scenarios.

[0109] like Figure 6 As shown, the embodiment of the present application provides a lithium-ion battery pulse discharge performance detection system, including: a low-temperature constant temperature box 601, an electronic oscilloscope 602, and a battery charge and discharge test device 603.

[0110] The low temperature thermostat 601 is used to provide a low temperature environment for the battery to be tested, and the temperature of the low temperature thermostat is maintained at a first temperature, and the value range of the first temperature is [-30°C, -5°C]. The electronic oscilloscope 602 is used to detect and collect the pulse discharge current curve of the battery. The battery charge and discharge test device 603 is used to repeatedly discharge the battery to be tested in a low temperature and low power scenario in a pulse manner based on the pulse discharge current curve, so as to realize the pulse discharge performance detection of the battery to be tested.

[0111] The following, combined Figure 6 The lithium-ion battery pulse discharge performance detection method provided in the embodiment of the present application is described.

[0112] First, in a low temperature environment, an electronic oscilloscope is used to collect the pulse discharge current curve of the battery to be tested. Specifically, the battery to be tested is connected to the electronic oscilloscope 602 and then installed on an electronic device (such as a mobile phone), and the electronic device equipped with the battery to be tested is placed in a low-temperature thermostat 601 at K°C. After the electronic device has been standing in the low-temperature thermostat 601 at K°C for t1min, the pulse discharge application in the electronic device is turned on in the low-temperature thermostat 601 to run. Among them, the pulse discharge application can be an application such as taking pictures, making calls, and recording. If it is a photo taking application, then after turning on the photo taking application, manually operate the mobile phone to take pictures continuously for n0 times at an interval of t2s. If it is an application such as making calls or recordings, keep it in a calling state or a recording state after turning it on.

[0113] During the operation of the pulse discharge application, the discharge current curve of the battery to be tested is collected synchronously through the connected electronic oscilloscope 602 to obtain the pulse discharge current curve of the battery to be tested. After the electronic oscilloscope 602 collects the pulse discharge current curve, the pulse discharge current curve can be directly input to the battery charge and discharge test device 603. The battery charge and discharge test device 603 calculates the average value of the high peak current and the average value of the low peak current in the pulse discharge current curve to obtain the pulse high peak current and the pulse low peak current, and determines the duration corresponding to the pulse high peak current and the pulse low peak current from the curve. That is, the expression at3+bt4 is obtained. It is also possible to use artificial or other equipment to obtain the pulse high peak current and the pulse low peak current and the corresponding duration (at3+bt4) based on the pulse discharge current curve, and then directly input the pulse high peak current and the pulse low peak current and the duration (at3+bt4) into the battery charge and discharge test device 603.

[0114] Secondly, under normal temperature (second temperature), the battery to be tested is discharged to a low power by the battery charge and discharge test device 603. Specifically, the battery to be tested under normal temperature is connected to the battery charge and discharge test device 603. On the battery charge and discharge test device 603, the standard discharge current A1 is used to control the battery to be tested to discharge to the battery discharge limit voltage V1, and after the battery to be tested is left for 5 minutes, the standard charge current A2 is used to control the battery to be tested to charge to the battery charge limit voltage V2. After the battery to be tested is left for 5 minutes again, the standard discharge current A1 is used to control the battery to be tested to discharge to the battery discharge limit voltage V1, and then the discharge capacity of the battery to be tested is recorded as its battery capacity C1. Furthermore, the battery charge and discharge test device calculates the low power (first power) C2 of the battery to be tested based on the battery capacity C1.

[0115] Then, in a low-temperature environment, the battery charge and discharge test device 603 repeatedly discharges the battery under test in a low-power state based on the pulse discharge current of the battery under test, and records the number of discharges when the voltage of the battery under test is less than the shutdown voltage during the repeated discharge process. Among them, repeated discharge refers to the use of the pulse high peak current and the pulse low peak current in the pulse discharge current to alternately control the battery under test to discharge, and the duration of each discharge is controlled by the corresponding duration. That is, after the battery under test is placed in a low-temperature thermostat 601 at K℃ and left to stand for t1min, the battery charge and discharge test device 603 is connected to the low-power battery under test placed in the low-temperature thermostat 601. The battery charge and discharge test device 603 uses the pulse high peak current and the pulse low peak current to alternately control the battery under test to repeatedly discharge n1 times in a pulse manner and synchronously detects the voltage of the battery under test after each discharge. The battery charge and discharge test device 603 compares the detected voltage with the shutdown voltage V3 of the battery under test. If the voltage data collected for n3 consecutive times is lower than the shutdown voltage V3, it is determined that the battery under test has been completely consumed and entered the shutdown state. At this time, the number of discharges n2 of the pulse load is recorded.

[0116] Finally, the pulse discharge performance of the battery to be tested is evaluated using the discharge number n2 as a quantitative indicator of performance evaluation. The smaller the discharge number n2, the worse the performance of the battery to be tested. The greater the discharge number n2, the better the performance of the battery to be tested. Correspondingly, the performance represented by the discharge number n2 is the performance of the corresponding pulse discharge application in the electronic device.

[0117] For example, when the pulse discharge during the performance test is applied to taking pictures, the performance represented by the discharge number n2 is the photo performance of the electronic device in a low-power and low-temperature scenario. Similarly, when the pulse discharge during the performance test is applied to making calls or recording, the performance represented by the discharge number n2 is the call or recording performance of the electronic device in a low-power and low-temperature scenario.

[0118] In addition, the battery charge and discharge test device 603 can form a pulse voltage discharge curve based on the relationship between voltage and discharge times, and display the pulse voltage discharge curve on its display screen, so that the tester can directly read the discharge times n2 based on the curve to determine the pulse discharge performance of the battery to be tested.

[0119] It can be seen that the battery charge and discharge test device 603 of the system in the embodiment of the present application performs pulse discharge on the battery to be tested based on the pulse discharge current, and determines the number of pulse load discharges as a quantitative indicator to determine the pulse discharge performance of the battery to be tested, thereby being able to effectively and accurately evaluate the pulse discharge performance of the battery to be tested in low-power and low-temperature scenarios, and further accurately determine the performance of some pulse discharge applications that are often run in low-power and low-temperature scenarios.

[0120] Another embodiment of the present application provides a battery charge and discharge test device, which includes one or more processors and a memory, and the memory is coupled to the processor. One or more computer programs are stored in the memory, and when the processor executes the computer program, the battery charge and discharge test device can execute the lithium-ion battery pulse discharge performance detection method described in any of the above embodiments.

[0121] Another embodiment of the present application provides a computer-readable storage medium, which stores a computer program. When the computer program is executed by a processor in an electronic device, the electronic device implements the lithium-ion battery pulse discharge performance detection method described in any of the above embodiments.

[0122] The embodiment of the present application also provides a computer program product. When the computer program product is run on a computer, the computer is enabled to execute each function or step in the lithium-ion battery pulse discharge performance detection method recorded in any of the above embodiments.

[0123] Through the description of the above implementation methods, technical personnel in the relevant field can clearly understand that for the convenience and simplicity of description, only the division of the above-mentioned functional modules is used as an example. In actual applications, the above-mentioned functions can be assigned to different functional modules as needed, that is, the internal structure of the device can be divided into different functional modules to complete all or part of the functions described above.

[0124] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic, for example, the division of modules or units is only a logical function division, and there may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another device, or some features can be ignored or not executed. Another point is that the mutual coupling or direct coupling or communication connection shown or discussed can be through some interfaces, indirect coupling or communication connection of devices or units, which can be electrical, mechanical or other forms.

[0125] The units described as separate components may or may not be physically separated, and the components shown as units may be one physical unit or multiple physical units, that is, they may be located in one place or distributed in multiple different places. Some or all of the units may be selected according to actual needs to achieve the purpose of the present embodiment.

[0126] In addition, each functional unit in each embodiment of the present application may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0127] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a readable storage medium. Based on this understanding, the technical solution of the embodiment of the present application is essentially or the part that contributes to the prior art or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium, including several instructions to enable a device (which can be a single-chip microcomputer, chip, etc.) or a processor (processor) to perform all or part of the steps of the various embodiments of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read only memory (ROM), random access memory (RAM), disk or optical disk and other media that can store program code.

[0128] The above contents are only specific implementation methods of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions within the technical scope disclosed in the present application shall be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be subject to the protection scope of the claims.

Claims

1. A method for detecting pulse discharge performance of a lithium-ion battery, characterized in that: include: Obtaining a pulse discharge current and a corresponding duration of the battery to be tested at a first temperature; wherein the pulse discharge current is a discharge current during a pulse discharge application of an electronic device including the battery to be tested, and the pulse discharge current includes a pulse peak current and a pulse low peak current; and the value range of the first temperature is [-30°C, -5°C]; After controlling the battery to be tested at the second temperature to discharge to the first power level, the battery to be tested at the first temperature is repeatedly discharged by alternately controlling the pulse high peak current and the pulse low peak current, and the duration of each discharge is constrained by the corresponding duration; wherein the value interval of the second temperature is [15°C, 25°C]; the value interval of the first power level is [5%C1, 35%C1], and C1 represents the battery capacity of the battery to be tested; During the repeated discharge process, the number of discharges when the voltage of the battery to be tested is less than the shutdown voltage is recorded, and the pulse discharge performance of the battery to be tested is determined according to the number of discharges.

2. The method according to claim 1, characterized in that The step of obtaining a pulse discharge current and a corresponding duration of the battery to be tested at a first temperature includes: Acquire a pulse discharge current curve of the battery to be tested at a first temperature; wherein the pulse discharge current curve is a current curve detected during a pulse discharge application of an electronic device powered by the battery to be tested; Calculating an average value of the peak current in the pulse discharge current curve as the pulse peak current, and taking the duration of the peak current as the duration corresponding to the pulse peak current; The average value of the low peak current in the pulse discharge current curve is calculated as the pulse low peak current, and the duration of the low peak current is used as the duration corresponding to the pulse low peak current.

3. The method according to claim 1, characterized in that During the repeated discharge process, recording the number of discharges when the voltage of the battery to be tested is less than the shutdown voltage includes: During repeated discharge, detecting the voltage of the battery to be tested during each discharge; Comparing the detected voltages with the shutdown voltages of the batteries to be tested; When the voltage is less than the shutdown voltage for a preset number of consecutive times, the difference between the current number of repeated discharges and the preset number of times is calculated to obtain the number of discharges when the voltage of the battery to be tested is less than the shutdown voltage.

4. The method according to claim 1, characterized in that The battery capacity detection method comprises: At the second temperature, the battery to be tested is controlled to discharge once based on the battery discharge limit voltage and the standard discharge current of the battery to be tested, and after the discharge control is completed and the battery to be tested is left for a preset time, the battery to be tested is controlled to charge once based on the battery charge limit voltage and the standard charge current of the battery to be tested; After the charging control is completed and the battery to be tested is placed for a preset time, the battery to be tested is controlled to be discharged again based on the battery discharge limit voltage and standard discharge current of the battery to be tested, and the discharge capacity of the battery to be tested this time is recorded as the battery capacity of the battery to be tested.

5. The method according to claim 1, characterized in that The controlling the battery to be tested at the second temperature to discharge to the first power level includes: The battery to be tested is controlled to be charged once based on the battery charging limit voltage and the standard charging current of the battery to be tested; after the charging control is completed and the battery to be tested is left for a preset time, the battery to be tested is controlled to be discharged with the standard discharge current of the battery to be tested until the power of the battery to be tested drops to the first power.

6. A lithium-ion battery pulse discharge performance detection system, characterized in that: include: A low temperature constant temperature box, an electronic oscilloscope, and a battery charge and discharge test device; wherein the temperature of the low temperature constant temperature box is maintained at a first temperature, and the value range of the first temperature is [-30°C, -5°C]; The electronic oscilloscope is used to collect the pulse discharge current curve of the battery to be tested; wherein the battery to be tested is connected to the electronic device and placed in the low-temperature constant temperature box, and the electronic oscilloscope collects the discharge current of the battery to be tested when the electronic device runs the pulse discharge application to obtain the pulse discharge current curve; The battery charge and discharge test device is used to obtain a pulse discharge current and a corresponding duration according to the pulse discharge current curve, wherein the pulse discharge current includes a pulse peak current and a pulse low peak current; after controlling the battery to be tested at a second temperature to discharge to a first power, the battery to be tested in the low-temperature constant temperature box is repeatedly discharged by alternately controlling the pulse peak current and the pulse low peak current, and the duration of each discharge is constrained by the corresponding duration; wherein the value interval of the second temperature is [15°C, 25°C]; the value interval of the first power is [5%C1, 35%C1], and C1 represents the battery capacity of the battery to be tested; during the repeated discharge process, the number of discharges when the voltage of the battery to be tested is less than the shutdown voltage is recorded, and the pulse discharge performance of the battery to be tested is determined according to the number of discharges.

7. The system according to claim 6, characterized in that The battery charge and discharge test device is also used to calculate the average value of the peak current in the pulse discharge current curve as the pulse peak current, and to use the duration of the peak current as the duration corresponding to the pulse peak current; The average value of the low peak current in the pulse discharge current curve is calculated as the pulse low peak current, and the duration of the low peak current is used as the duration corresponding to the pulse low peak current.

8. The system according to claim 6, characterized in that The battery charge and discharge test device is also used to detect the voltage of the battery to be tested during each discharge during repeated discharge; and compare each detected voltage with the shutdown voltage of the battery to be tested; When the voltage is less than the shutdown voltage for a preset number of consecutive times, the difference between the current number of repeated discharges and the preset number of times is calculated to obtain the number of discharges when the voltage of the battery to be tested is less than the shutdown voltage.

9. The system according to claim 6, characterized in that The battery charge and discharge test device is further used to control the battery to be tested to discharge once based on the battery discharge limit voltage and the standard discharge current of the battery to be tested at the second temperature, and after the discharge control is completed and the battery to be tested is placed for a preset time, control the battery to be tested to charge once based on the battery charge limit voltage and the standard charge current of the battery to be tested; after the charge control is completed and the battery to be tested is placed for a preset time, control the battery to be tested to discharge once again based on the battery discharge limit voltage and the standard discharge current of the battery to be tested, and record the discharge capacity of the battery to be tested this time as the battery capacity of the battery to be tested.

10. The system according to claim 6, characterized in that The battery charge and discharge test device is also used to control the battery to be tested to perform a charge based on the battery charge limit voltage and standard charge current of the battery to be tested; after the charge control is completed and the battery to be tested is placed on hold for a preset time, the battery to be tested is controlled to discharge with the standard discharge current of the battery to be tested until the power of the battery to be tested drops to the first power.

11. A battery charge and discharge test device, characterized in that: include: one or more processors and a memory, the memory being coupled to the processor; One or more computer program codes are stored in the memory, and the computer program codes include computer instructions; when the processor executes the computer instructions, the battery charge and discharge test equipment executes the lithium ion battery pulse discharge performance detection method as described in any one of claims 1-5.

12. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor of an electronic device, the electronic device executes the lithium ion battery pulse discharge performance detection method according to any one of claims 1 to 5.

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