Battery detection device and battery detection method

Abstract

The invention provides a battery detection device and a battery detection method, and the device comprises a capacitance sensing module which is attached to the surface of a to-be-detected battery, and generates a capacitance value change based on the protrusion or recess of the to-be-detected battery; the charging and discharging module is electrically connected with the capacitance sensing module and is used for charging and discharging the capacitance sensing module; the detection module is electrically connected with the capacitance sensing module and is used for detecting a residual voltage value of the capacitance sensing module; the control module is electrically connected with the detection module and is used for generating an alarm signal when the residual voltage value reaches a preset condition; the alarm module is electrically connected with the control module and used for receiving the alarm signal and sending alarm information. According to the battery detection device and the battery detection method disclosed by the invention, the capacitance sensing module is adopted to sense the deformation of the to-be-detected battery, the tiny swelling or sunken deformation of the to-be-detected battery can cause the change of the relative position between the capacitor plates, and further cause the change of the capacitance value, and the change can be accurately captured by detecting the residual voltage value of the capacitor.

Description

Technical Field

[0001] This disclosure relates to the field of battery safety monitoring technology, and in particular to a battery testing device and a battery testing method. Background Technology

[0002] With the continuous development of battery technology, batteries have been widely used in various electronic devices. However, batteries may bulge or dent during use, which not only affects battery performance and lifespan, but may also cause safety accidents such as explosions and fires in severe cases.

[0003] Currently, existing battery deformation detection methods have many shortcomings. Some detection methods are complex in structure and costly, making them unsuitable for large-scale application. Other detection methods have low sensitivity and are difficult to accurately capture the subtle changes caused by battery deformation, resulting in untimely alarms or a high false alarm rate. Summary of the Invention

[0004] This disclosure provides a battery testing device and a battery testing method to at least solve the above-mentioned technical problems existing in the prior art.

[0005] A first aspect of this disclosure provides a battery testing device, comprising:

[0006] A capacitance sensing module is attached to the surface of the battery under test. The capacitance sensing module is configured to generate a bulge or a depression when the battery under test is deformed, and to generate a change in capacitance value based on the bulge or depression.

[0007] A charging and discharging module is electrically connected to the capacitance sensing module and is used to charge and discharge the capacitance sensing module.

[0008] The detection module is electrically connected to the capacitance sensing module and is used to detect the change in residual voltage value across the capacitance sensing module as the capacitance value changes during the charging and discharging operation of the charging and discharging module.

[0009] The control module, electrically connected to the detection module, is used to generate an alarm signal when the residual voltage value reaches a preset condition; and

[0010] An alarm module, electrically connected to the control module, is used to receive the alarm signal and issue alarm information.

[0011] In one possible implementation, the capacitive sensing module includes:

[0012] The first capacitor sheet is attached to the surface of the battery under test and is used to bulge or dent synchronously with the deformation of the battery under test.

[0013] A second capacitor sheet is disposed opposite to the first capacitor sheet to form a capacitor structure; and

[0014] A compressible dielectric layer is filled between the first capacitor sheet and the second capacitor sheet, and is configured to change its local thickness and effective dielectric constant with the deformation of the first capacitor sheet, thereby producing a change in capacitance value.

[0015] In one embodiment, the capacitive sensing module further includes a fixing layer disposed between the first capacitor sheet and the second capacitor sheet to maintain the relative position between the first capacitor sheet and the second capacitor sheet.

[0016] In one possible implementation, the charging / discharging module includes a load switch;

[0017] The control module is electrically connected to the load switch and is used to output an enable signal to the load switch to control the open or closed state of the load switch.

[0018] When the load switch is turned on, the charging and discharging module charges the capacitance sensing module to the target voltage;

[0019] When the load switch is closed, the capacitance sensing module performs a discharge operation;

[0020] The detection module samples the residual voltage value of the capacitance sensing module at fixed time intervals during the discharge process of the capacitance sensing module.

[0021] In one embodiment, the alarm module includes a display component electrically connected to the control module, which is used to present the alarm information in a first display format in response to the alarm signal.

[0022] In one possible implementation, the alarm module further includes a remote alarm unit;

[0023] The remote alarm unit is communicatively connected to the control module and is used to receive the alarm signal sent by the control module and present the alarm information in a second display format.

[0024] The first display format and the second display format are different ways of presenting information.

[0025] A second aspect of this disclosure provides a battery detection method applied to the battery detection device described in any of the above-described embodiments, the battery detection method comprising:

[0026] Perform a charging operation on the capacitive sensing module;

[0027] When the charging voltage reaches the peak voltage, charging stops and the discharge process of the capacitor sensing module is started.

[0028] During the discharge process, the residual voltage value of the capacitance sensing module is sampled at fixed time intervals;

[0029] In response to the residual voltage value reaching a preset condition, it is determined that the deformation of the battery under test has reached a preset degree, and an alarm signal is generated;

[0030] The alarm module receives the alarm signal and issues an alarm message.

[0031] In one possible implementation, the step of determining that the deformation of the battery under test has reached a preset degree in response to the residual voltage value reaching a preset condition and generating an alarm signal includes:

[0032] Set a threshold for changes in residual voltage;

[0033] Calculate the change in the residual voltage;

[0034] An alarm signal is generated in response to the change value being greater than or equal to the change threshold;

[0035] The change value is used to indicate the state of the battery under test, and the state is related to the degree of deformation of the battery under test.

[0036] In one possible implementation, the step of determining that the deformation of the battery under test has reached a preset degree in response to the residual voltage value reaching a preset condition and generating an alarm signal includes:

[0037] The state of the battery under test is detected based on a capacitor discharge model, which satisfies the following relationship:

[0038]

[0039] Among them, V c V is the residual voltage value. s Let be the initial voltage when charging stops, e be the natural constant, t be the time elapsed from the start of discharge to the current sampling time, R be the discharge resistance, and C be the capacitance at time t.

[0040] In one possible implementation, receiving the alarm signal and issuing alarm information via the alarm module includes:

[0041] In response to the alarm signal, the alarm information is presented in a first display format;

[0042] And / or receive the alarm signal and present the alarm information in a second display format;

[0043] The first display format and the second display format are different ways of presenting information.

[0044] The battery testing device and method disclosed herein utilize a capacitance sensing module to detect the deformation of the battery under test. Even minute bulges or dents in the battery can cause changes in the relative positions of the capacitor plates, leading to alterations in capacitance. This change can be accurately captured by detecting the residual voltage value of the capacitor, demonstrating high sensitivity to minute deformations. The capacitance sensing module is directly attached to the surface of the battery under test, directly responding to deformation and avoiding interference from indirect detection. A control module sets preset conditions, and when the deformation of the battery reaches a certain level, an alarm is quickly triggered, allowing users to promptly recognize abnormal battery conditions and take measures to prevent safety accidents. Furthermore, the battery testing device of this disclosure mainly consists of a capacitance sensing module, a charge / discharge module, a detection module, a control module, and an alarm module. Each module has a relatively simple structure, is easy to integrate and manufacture, and has low cost, facilitating large-scale application.

[0045] It should be understood that the description in this section is not intended to identify key or essential features of the embodiments of this disclosure, nor is it intended to limit the scope of this disclosure. Other features of this disclosure will become readily apparent from the following description. Attached Figure Description

[0046] The above and other objects, features, and advantages of this disclosure will become readily apparent from the following detailed description of exemplary embodiments, taken in conjunction with the accompanying drawings. Several embodiments of this disclosure are illustrated in the drawings by way of example and not limitation, in which:

[0047] In the accompanying drawings, the same or corresponding reference numerals indicate the same or corresponding parts.

[0048] Figure 1 A schematic diagram of the overall structure of the battery detection device according to an embodiment of this disclosure is shown;

[0049] Figure 2 A schematic diagram of the overall structure of the battery testing device according to an embodiment of the present disclosure (deformation of the battery under test) is shown;

[0050] Figure 3 A schematic diagram of the structure of the capacitance sensing module of the battery detection device according to an embodiment of the present disclosure is shown;

[0051] Figure 4 An architectural diagram of a battery detection device according to an embodiment of the present disclosure is shown;

[0052] Figure 5 Another architectural diagram of the battery detection device according to an embodiment of this disclosure is shown;

[0053] Figure 6 Another architectural diagram of the battery detection device according to an embodiment of the present disclosure is shown.

[0054] The numbers in the diagram are as follows: 1. Capacitive sensing module; 2. Battery under test; 11. First capacitor sheet; 12. Second capacitor sheet; 13. Fixing layer. Detailed Implementation

[0055] To make the objectives, features, and advantages of this disclosure more apparent and understandable, the technical solutions in the embodiments of this disclosure will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this disclosure, and not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this disclosure without creative effort are within the scope of protection of this disclosure.

[0056] Reference Figure 1 , Figure 2 and Figure 4 As shown, this disclosure discloses an exemplary embodiment of a battery testing device, including a capacitance sensing module 1, a charge / discharge module, a detection module, a control module, and an alarm module. The capacitance sensing module 1 is attached to the surface of the battery under test 2. The capacitance sensing module 1 is configured to generate a bulge or depression when the battery under test 2 is deformed, and to generate a change in capacitance value based on the bulge or depression. The charge / discharge module is electrically connected to the capacitance sensing module 1 and is used to perform charge / discharge operations on the capacitance sensing module 1. The detection module is electrically connected to the capacitance sensing module 1 and is used to detect the change in residual voltage value across the capacitance sensing module 1 as the capacitance value changes during the charge / discharge operation of the charge / discharge module. The control module is electrically connected to the detection module and is used to generate an alarm signal when the residual voltage value reaches a preset condition. The alarm module is electrically connected to the control module and is used to receive the alarm signal and issue alarm information.

[0057] In this embodiment, the capacitance sensing module 1 is attached to the surface of the battery under test 2. Since the deformation of the battery under test 2 is usually most pronounced in the central area when gas is generated due to temperature or material changes, causing bulging or denting, the capacitance sensing module 1 can be specifically attached to the flat central area of ​​the surface of the battery under test 2. Its function is to convert the deformation of the battery under test 2 into a change in its capacitance value, providing a physical basis for subsequent detection. A charge / discharge module is electrically connected to the capacitance sensing module 1 and is used to perform charge / discharge operations on the capacitance sensing module 1 according to set parameters, such as voltage and cycle. For example, the charge / discharge module can provide a 5V charging voltage and set a charge / discharge cycle of 10ms. A detection module is electrically connected to the capacitance sensing module 1 and is used to detect the residual voltage value of the capacitance sensing module 1 during the discharge process. For example, the voltage across the capacitance sensing module 1 can be detected for the first time 1ms after the start of discharge, and then detected every 1ms thereafter to continuously acquire voltage change data. The control module can be implemented using an embedded controller (EC) to receive the detected residual voltage value. The control module has preset conditions. Taking a charging module providing a 5V charging voltage as an example: because the deformation of the battery under test 2 is related to the capacitance characteristics of the capacitance sensing module 1, as the battery under test 2 expands and deforms, it cannot store the initial charge, causing a change in the capacitance of the capacitance sensing module 1. When the deformation of the battery under test 2 reaches a certain level, the residual voltage value detected by the detection module will be lower than a preset threshold. This preset threshold can be set to 4V. That is, the preset condition at this time is "residual voltage value below 4V". When the residual voltage value is detected to be lower than 4V, the control module will generate an alarm signal, indicating that the deformation of the battery under test 2 has reached a dangerous level. If the residual voltage value is within the range of 4V to 5V, the battery under test 2 is considered to be in normal condition, and no alarm signal will be generated. It should be noted that the preset conditions are not limited to the above threshold judgment; they can also be set to other forms according to actual needs, such as "the change in residual voltage value is higher than a certain preset value," which can also reflect severe deformation of the capacitor position of the battery under test 2. Other possible preset conditions will not be elaborated here. The alarm module is electrically connected to the control module. The alarm module can take the form of, but is not limited to, indicator lights, buzzers, or display platforms. Among them, the indicator lights can display different colors according to different control signals, thereby intuitively reflecting the status of the battery under test 2; the buzzer can provide sound feedback on the status of the battery under test 2; and the display platform can display a pop-up window to intuitively prompt the user about the battery status.

[0058] In summary, the battery testing device disclosed herein uses a capacitance sensing module 1 to sense the deformation of the battery under test 2. Even slight bulging or denting deformation of the battery under test 2 can cause changes in the relative positions between the capacitor plates, thereby altering the capacitance value. By detecting the residual voltage value of the capacitor, this change can be accurately captured, demonstrating high sensitivity to minute deformations. The capacitance sensing module 1 is directly attached to the surface of the battery under test 2, directly responding to the deformation of the battery under test 2, avoiding interference from indirect detection. By setting preset conditions through the control module, when the deformation of the battery under test 2 reaches a certain level, an alarm can be quickly triggered, allowing the user to be promptly aware of the abnormal state of the battery under test 2 and facilitating measures to prevent safety accidents. Furthermore, the battery testing device disclosed herein mainly consists of a capacitance sensing module 1, a charging / discharging module, a detection module, a control module, and an alarm module. Each module has a relatively simple structure, is easy to integrate and manufacture, has low cost, and is conducive to large-scale promotion and application.

[0059] Reference Figure 3 As shown, in one embodiment, the capacitance sensing module 1 includes a first capacitor sheet 11, a second capacitor sheet 12, and a compressible dielectric layer. The first capacitor sheet 11 is attached to the surface of the battery under test 2 and is used to bulge or dent synchronously with the deformation of the battery under test 2. The second capacitor sheet 12 is disposed opposite to the first capacitor sheet 11 to form a capacitor structure. The compressible dielectric layer is filled between the first capacitor sheet 11 and the second capacitor sheet 12 and is configured to change its local thickness and effective dielectric constant with the deformation of the first capacitor sheet 11, thereby generating a change in capacitance value.

[0060] In this embodiment, the first capacitor sheet 11 and the second capacitor sheet 12 are arranged parallel to each other, and the compressible dielectric layer between them is air or an insulating medium, forming a parallel plate capacitor. The first capacitor sheet 11 and the second capacitor sheet 12 have the same area and cover the bulging sensitive area on the surface of the battery under test 2. The first capacitor sheet 11 is made of a flexible conductive material, such as copper foil, and has an adhesive layer on the side facing away from the second capacitor sheet 12, which can be tightly attached to the central area of ​​the surface of the battery under test 2. The second capacitor sheet 12 is made of a rigid conductive material, such as a hard copper plate, and is kept at a preset distance from the first capacitor sheet 11 by a fixing bracket or an insulating layer to ensure that the capacitance value is stable when there is no deformation. When the battery under test 2 is normal and not bulging, the first capacitor sheet 11 remains flat, the distance between it and the second capacitor sheet 12 is stable, and the capacitance value of the capacitance sensing module 1 is stable within a preset range. At this time, after being charged by the charge and discharge module at a voltage of 5V and a cycle of 10ms, the residual voltage value of the capacitance sensing module 1 detected by the detection module is stable at close to 5V. The control module judges it as a normal state, and the alarm module does not issue an alarm message. When the battery under test 2 is bulging or dented, the first capacitor sheet 11, which is in close contact with the surface of the battery under test 2, will deform synchronously with the surface of the battery under test 2. This causes a change in the shape of the capacitor structure formed by the first capacitor sheet 11 and the second capacitor sheet 12, which in turn causes a change in the capacitance value. Since the deformation of the first capacitor sheet 11 directly changes the physical characteristics of the capacitor structure, the capacitance value of the capacitance sensing module 1 will produce a detectable change. When the detection module detects the residual voltage during discharge, the change in capacitance value causes a change in the discharge characteristics, resulting in a corresponding change in the residual voltage.

[0061] Continue to refer to Figure 3 As shown, in one embodiment, the capacitive sensing module 1 further includes a fixing layer 13, which is disposed between the first capacitor sheet 11 and the second capacitor sheet 12 to maintain the relative position between the first capacitor sheet 11 and the second capacitor sheet 12.

[0062] In this embodiment, the fixing layer 13 is made of an insulating material, such as mica, polyimide, or ceramic, with uniform thickness to ensure a uniform gap between the first capacitor sheet 11 and the second capacitor sheet 12. The first capacitor sheet 11, the fixing layer 13, and the second capacitor sheet 12 are encapsulated to form an integral structure, which improves the mechanical strength of the capacitance sensing module 1, facilitates installation and maintenance, extends service life, and prevents relative slippage. In summary, the fixing layer 13 can effectively maintain the relative position between the first capacitor sheet 11 and the second capacitor sheet 12, preventing gap shifts caused by vibration, impact, or temperature changes.

[0063] Reference Figure 5As shown, in one embodiment, the charging / discharging module includes a load switch, and a control module electrically connected to the load switch is used to output an enable signal to the load switch to control the open or closed state of the load switch. When the load switch is open, the charging / discharging module charges the capacitor sensing module 1 to the target voltage; when the load switch is closed, the capacitor sensing module performs a discharge operation. During the discharge process of the capacitor sensing module 1, the detection module samples the residual voltage value of the capacitor sensing module 1 at fixed time intervals.

[0064] In this embodiment, the charging and discharging module further includes a charging unit and a resistor. The charging unit is selectively connected to the capacitance sensing module 1 via a load switch, and is used to charge the capacitance sensing module 1 when the load switch is open. The control module is connected to the load switch via a GPIO interface, and outputs a high-level or low-level signal as an enable signal to control the state of the load switch. For example, when the control module outputs a high-level enable signal to the load switch, the load switch is turned on, connecting the charging circuit, and the charging unit charges the capacitance sensing module 1 through the load switch. The charging time is timed by the control module. When the control module outputs a low-level enable signal to the load switch, the load switch is turned off, connecting the discharging circuit. The discharging time is also timed by the control module. 1ms after the start of discharging, the control module sends a sampling signal to the detection module. This signal triggers the detection module to sample and detect the residual voltage value of the capacitance sensing module 1, achieving precise synchronization between charging / discharging and detection. When different types of batteries are replaced, the period of the enable signal output by the control module can be adjusted through system software, or the charging voltage can be adjusted through the voltage regulation unit to adapt to different detection requirements. The load switch can be implemented using semiconductor switching devices such as transistors or triodes.

[0065] Continue to refer to Figure 5 As shown, in one possible embodiment, the alarm module includes a display component electrically connected to the control module, which is used to present alarm information in a first display format in response to an alarm signal.

[0066] In this embodiment, the display component can be an indicator light, a buzzer, or a combination thereof. The indicator light can be an LED, and the buzzer can be, but is not limited to, a piezoelectric buzzer or an electromagnetic buzzer. When the display component is an indicator light, the first display form can be flashing at a specific frequency (e.g., periodic on / off at 1Hz) or a color change (e.g., changing from green to red); under normal conditions, the indicator light operates in a conventional display form (e.g., constantly lit green). When the display component is a buzzer, the first display form can be a sound prompt with a specific rhythm (e.g., a cycle of "a long beep for 3 seconds followed by a 1-second pause"); under normal conditions, the buzzer does not emit sound. When the display component is a combination of an indicator light and a buzzer, the first display form is a synchronized audio-visual alarm (e.g., the indicator light flashes while the buzzer sounds), enhancing the alarm's prompting effect.

[0067] Furthermore, referring to Figure 6 As shown, using an LED light as a specific embodiment for the display component, the control module is connected to the cathode of the LED light via a pulse width modulation (PWM) signal to control the working state of the LED light. When no deformation of the capacitance sensing module 1 is detected (or the capacitance value change is within the normal range), the control module outputs a high-level PWM signal, and the LED light is in a constantly lit state; when a significant change in the capacitance value of the capacitance sensing module 1 is detected (i.e., severe deformation), the control module outputs a PWM signal of a specific frequency, controlling the LED light to flash at a preset first display frequency.

[0068] Refer again Figure 5 As shown, in one possible embodiment, the alarm module further includes a remote alarm unit, which is communicatively connected to the control module and is used to receive alarm signals sent by the control module and present alarm information in a second display format; wherein, the first display format and the second display format are different information presentation methods.

[0069] In this embodiment, the control module establishes a connection with the system platform via an Enhanced Serial Peripheral Interface (eSPI) signal. The remote alarm unit communicates with the system platform and receives alarm signals from the control module through the system platform. The remote alarm unit can take the form of a mobile terminal (such as a smartphone or tablet), a remote monitoring platform, or an audible and visual alarm device. The second display format includes, but is not limited to, mobile terminal APP push notifications, remote monitoring platform data markers, SMS reminders, or remote audible and visual alarms. The first display format is a local hardware prompt (such as LED flashing or buzzer sound), and the second display format is a remote electronic information prompt (such as text notifications or data packets), complementing each other in terms of information carrier and transmission range. The remote alarm unit and the system platform are connected via wireless communication methods including, but not limited to, Wi-Fi, Bluetooth, cellular networks, or long-range radio, adapting to communication needs at different distances. The alarm information sent by the control module to the system platform via the eSPI signal can include, but is not limited to, structured data such as battery ID, degree of deformation, and detection time. After parsing the data, the system platform pushes the corresponding information to the remote alarm unit according to preset rules.

[0070] Understandably, in some feasible scenarios, referencing Figure 6 As shown, the functions of the control module and the detection module can be implemented through EC.

[0071] This disclosure also provides a battery detection method for a battery detection device applied to any of the above-described embodiments, the battery detection method comprising:

[0072] Step S1: Charge the capacitive sensing module 1.

[0073] Step S2: When the charging voltage reaches the peak voltage, stop charging and start the discharge process of the capacitor sensing module 1.

[0074] Step S3: During the discharge process, sample the residual voltage value of the capacitance sensing module 1 at fixed time intervals;

[0075] Step S4: In response to the residual voltage value reaching the preset condition, determine that the deformation of the battery under test has reached the preset degree and generate an alarm signal;

[0076] Step S5: Receive alarm signals and send alarm information through the alarm module.

[0077] In this embodiment, for step S1, charging the capacitor sensing module 1, the control module outputs an enable signal to the load switch of the charging / discharging module, causing the load switch to be in the open state, connecting the charging circuit, and the charging unit applies a stable voltage to the capacitor sensing module 1 for charging. For step S2, when the charging voltage reaches the peak voltage, charging stops and the discharging process of the capacitor sensing module 1 is started. The detection module monitors the charging voltage of the capacitor sensing module 1 in real time. When the voltage reaches the preset peak voltage, it sends a charging completion signal to the control module. After receiving the signal, the control module immediately changes the enable signal state of the load switch, closes the charging circuit and connects the discharging circuit, and starts the discharging process. For step S3, during the discharging process, the residual voltage value of the capacitor sensing module 1 is sampled at fixed time intervals. The control module synchronously triggers timing when the discharging process starts and sends sampling commands to the detection module at preset fixed time intervals. The detection module responds to the commands, collects the residual voltage value at both ends of the capacitor sensing module 1 and transmits it to the control module. For step S4, in response to the residual voltage value reaching the preset condition, it is determined that the deformation of the battery under test has reached the preset level, and an alarm signal is generated. The control module compares the sampled residual voltage value with the preset condition. When the residual voltage value reaches the preset condition, it is determined that the battery under test 2 has undergone significant deformation, and an alarm signal is immediately generated. For step S5, the alarm signal is received and alarm information is issued through the alarm module. The control module transmits the alarm signal to the alarm module, and the alarm module displays the alarm information.

[0078] Further explanation of the "preset condition" in step S4: When the deformation of the battery under test 2 reaches a certain level, the residual voltage value detected by the detection module will be lower than a preset threshold. In this case, the preset condition can be "the residual voltage value is lower than the preset threshold." That is, when the detected residual voltage value is lower than the preset threshold, the control module will generate an alarm signal, indicating that the deformation of the battery under test 2 has reached a dangerous level. The preset condition can also be "the change in residual voltage value is higher than a certain preset threshold," which also reflects severe deformation of the capacitor position of the battery under test 2. Other possible preset conditions will not be elaborated upon here.

[0079] In summary, the battery testing method of this battery testing device ensures that the residual voltage accurately reflects changes in capacitance by charging to the peak voltage and then discharging, combined with sampling at fixed time intervals. The detection error can be controlled within ±1%. The fixed time interval sampling, coupled with a real-time voltage comparison and alarm triggering mechanism, allows for a faster response time from significant deformation of the tested battery 2 to the issuance of an alarm message. The charging and discharging control logic and sampling strategy of this battery testing method make the testing process repeatable and traceable, avoiding inconsistencies caused by human operation or environmental interference.

[0080] Specifically, in one embodiment, step S4, in response to the residual voltage value reaching a preset condition, determines that the deformation of the battery under test has reached a preset degree and generates an alarm signal, includes:

[0081] Step S41: Set the threshold for changes in residual voltage;

[0082] Step S42: Calculate the change in residual voltage;

[0083] Step S43: In response to a change value being greater than or equal to a change threshold, an alarm signal is generated.

[0084] The change in residual voltage is used to indicate the state of the battery under test 2, and the state of the battery under test 2 is related to the degree of deformation of the battery under test 2.

[0085] In this embodiment, for step S41, setting the residual voltage change threshold, the control module pre-stores the residual voltage change threshold, which is set comprehensively based on the battery type, the characteristics of the capacitance sensing module 1, and safety standards. The change threshold can be adjusted through the system platform to adapt to the needs of different usage scenarios. For step S42, calculating the residual voltage change value, the control module stores the initial residual voltage value of the battery under test 2 in normal state, denoted as V. s It records the currently detected residual voltage value in real time, such as the residual voltage value after 1ms of discharge, denoted as V1; and records the value through the formula "change value ΔV=|V1-V". s| Calculate the change in residual voltage, and so on. For step S43, in response to the change value being greater than or equal to the change threshold, an alarm signal is generated. The control module compares the calculated change value ΔV with the preset change threshold. When ΔV ≥ the change threshold, it is determined that the deformation degree of the tested battery 2 has reached the level requiring an alarm, and an alarm signal is immediately generated; when ΔV < the change threshold, it is determined that the tested battery 2 is in normal condition, and no alarm signal is generated. It can be understood that in practical applications, the state of the tested battery 2 can be further divided into no obvious deformation, slight deformation, and severe deformation as needed. Correspondingly, multiple change threshold ranges can be set to correspond to different response states, such as normal state, warning state, and alarm state. For example, When in a warning state, the control module sends a warning message to the system platform via eSPI signal, without activating audible or visual alarms. When in an alarm state, it simultaneously triggers local alarms such as flashing LEDs and remote alarms such as system pop-ups or mobile app push notifications. Therefore, by calculating the change in residual voltage, it directly reflects the voltage difference caused by the deformation of the battery under test 2, effectively distinguishing between normal fluctuations and abnormal changes compared to judging by a single threshold. Classifying the state of the battery under test 2 based on the range of change values ​​allows for issuing a warning when the battery under test 2 experiences moderate deformation, avoiding delays in processing due to an excessively high single alarm threshold. Furthermore, by adjusting the change threshold, it can adapt to the battery testing needs of different devices such as mobile phones, laptops, and electric vehicles.

[0086] In one embodiment, step S4, responding to the residual voltage value reaching a preset condition, determining that the deformation of the battery under test has reached a preset degree, and generating an alarm signal, further includes:

[0087] Step S44: Detect the state of the battery under test 2 based on the capacitor discharge model;

[0088] The capacitor discharge model satisfies the following relationship:

[0089]

[0090] Among them, V c The residual voltage value, V s Let be the initial voltage when charging stops, e be the natural constant, t be the time elapsed from the start of discharge to the current sampling time, R be the discharge resistance, and C be the capacitance at time t.

[0091] In this embodiment, the capacitor discharge model reflects the voltage change law of the capacitor during the discharge process. When the battery is not deformed, the capacitance value C is the initial value C0. At this time, the voltage V at different times t is... c It will strictly follow the model curve (the theoretical curve calculated with C0); when the deformation of the battery under test 2 causes a change in C, the actual V c The correspondence with t will deviate from the theoretical curve. The control module samples V at multiple different times t.c The actual sampling points (t, V) c Comparison with the theoretical curve (the theoretical curve calculated based on C0):

[0092] If the deviations between the actual sampling points and the theoretical curves are all within the allowable range, it indicates that C has not changed significantly and the state of the battery under test 2 is normal.

[0093] If the deviation exceeds the preset range, it indicates that C has changed significantly, corresponding to a significant deformation of the battery under test 2, and the control module generates an alarm signal.

[0094] Therefore, based on the capacitor discharge model, this disclosure achieves accurate judgment of the deformation of the battery under test 2 by comparing the residual voltage sampled at multiple time points with the theoretical curve in the scenario where the discharge time t changes dynamically.

[0095] In one possible implementation, step S5, receiving an alarm signal and issuing an alarm message through the alarm module, includes:

[0096] Step S51: In response to the alarm signal, present the alarm information in a first display format;

[0097] And / or step S52, receive the alarm signal and present the alarm information in a second display format;

[0098] The first display format and the second display format are different ways of presenting information.

[0099] In this embodiment, in step S51, in response to the alarm signal, the alarm information is presented in a first display format. Depending on the display component, the first display format can be a flashing of a specific frequency (e.g., periodic on / off at 1Hz) or a color change (e.g., from green to red), or a sound prompt with a specific rhythm (e.g., a loop of "a long beep for 3 seconds followed by a 1-second pause"), or a synchronized sound and light alarm (e.g., an indicator light flashes while a buzzer sounds), enhancing the alarm's prompting effect. Taking an LED light as a specific example: the control module is connected to the cathode of the LED light via a PWM signal to control the LED light's operating state. When no deformation of the capacitance sensing module 1 is detected or the capacitance value change is within the normal range, the control module outputs a high-level PWM signal, and the LED light remains constantly lit. When a significant change in the capacitance value of the capacitance sensing module 1 is detected, i.e., severe deformation, the control module outputs a PWM signal of a specific frequency, controlling the LED light to flash at a preset first display format.

[0100] Step S52: Receive alarm signals and present alarm information in a second display format. This includes the control module sending alarm information to the system platform via eSPI signal, and the remote alarm unit receiving the alarm signals from the control module through a communication connection with the system platform. The second display format of the alarm information includes, but is not limited to, mobile terminal APP push notifications, remote monitoring platform data markers, SMS alerts, or remote audible and visual alarms.

[0101] It should be noted that the execution logic of "and / or" in this embodiment includes: activating only the first display mode; activating both the first and second display modes simultaneously, for example, through dual prompts of sound and light and system information; or activating only the second display mode. The above execution methods can be flexibly selected according to actual needs and can adapt to different environments, as long as it ensures that alarm information can be effectively transmitted in various scenarios, enabling relevant personnel to promptly detect any abnormalities in the tested battery 2.

[0102] It should be understood that the various forms of processes shown above can be used to rearrange, add, or delete steps. For example, the steps described in this disclosure can be executed in parallel, sequentially, or in different orders, as long as the desired result of the technical solution disclosed in this disclosure can be achieved, and this is not limited herein.

[0103] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this disclosure, "a plurality of" means two or more, unless otherwise explicitly specified.

[0104] The above description is merely a specific embodiment of this disclosure, but the scope of protection of this disclosure is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in this disclosure should be included within the scope of protection of this disclosure. Therefore, the scope of protection of this disclosure should be determined by the scope of the claims.

Claims

1. A battery testing device, characterized in that, include: A capacitance sensing module is attached to the surface of the battery under test. The capacitance sensing module is configured to generate a bulge or a depression when the battery under test is deformed, and to generate a change in capacitance value based on the bulge or depression. A charging and discharging module is electrically connected to the capacitance sensing module and is used to charge and discharge the capacitance sensing module. The detection module is electrically connected to the capacitance sensing module and is used to detect the change in residual voltage value across the capacitance sensing module as the capacitance value changes during the charging and discharging operation of the charging and discharging module. The control module, electrically connected to the detection module, is used to generate an alarm signal when the residual voltage value reaches a preset condition. as well as An alarm module, electrically connected to the control module, is used to receive the alarm signal and issue alarm information.

2. The battery testing device according to claim 1, characterized in that, The capacitance sensing module includes: The first capacitor sheet is attached to the surface of the battery under test and is used to bulge or dent synchronously with the deformation of the battery under test. A second capacitor sheet is disposed opposite to the first capacitor sheet to form a capacitor structure; and A compressible dielectric layer is filled between the first capacitor sheet and the second capacitor sheet, and is configured to change its local thickness and effective dielectric constant with the deformation of the first capacitor sheet, thereby producing a change in capacitance value.

3. The battery testing device according to claim 2, characterized in that, The capacitance sensing module further includes a fixing layer, which is disposed between the first capacitor sheet and the second capacitor sheet to maintain the relative position between the first capacitor sheet and the second capacitor sheet.

4. The battery testing device according to claim 1, characterized in that, The charging / discharging module includes a load switch; The control module is electrically connected to the load switch and is used to output an enable signal to the load switch to control the open or closed state of the load switch. When the load switch is turned on, the charging and discharging module charges the capacitance sensing module to the target voltage; When the load switch is closed, the capacitance sensing module performs a discharge operation; The detection module samples the residual voltage value of the capacitance sensing module at fixed time intervals during the discharge process of the capacitance sensing module.

5. The battery testing device according to claim 1, characterized in that, The alarm module includes a display component, which is electrically connected to the control module and is used to present the alarm information in a first display format in response to the alarm signal.

6. The battery testing device according to claim 5, characterized in that, The alarm module also includes a remote alarm unit; The remote alarm unit is communicatively connected to the control module and is used to receive the alarm signal sent by the control module and present the alarm information in a second display format. The first display format and the second display format are different ways of presenting information.

7. A battery testing method applied to the battery testing apparatus according to any one of claims 1-6, characterized in that, The battery detection method includes: Perform a charging operation on the capacitive sensing module; When the charging voltage reaches the peak voltage, charging stops and the discharge process of the capacitor sensing module is started. During the discharge process, the residual voltage value of the capacitance sensing module is sampled at fixed time intervals; In response to the residual voltage value reaching a preset condition, it is determined that the deformation of the battery under test has reached a preset degree, and an alarm signal is generated; The alarm module receives the alarm signal and issues an alarm message.

8. The battery testing method of the battery testing device according to claim 7, characterized in that, The response to the residual voltage value reaching a preset condition, determining that the deformation of the battery under test has reached a preset degree, and generating an alarm signal includes: Set a threshold for changes in residual voltage; Calculate the change in the residual voltage; An alarm signal is generated in response to the change value being greater than or equal to the change threshold; The change value is used to indicate the state of the battery under test, and the state is related to the degree of deformation of the battery under test.

9. The battery testing method of the battery testing device according to claim 7, characterized in that, The response to the residual voltage value reaching a preset condition, determining that the deformation of the battery under test has reached a preset degree, and generating an alarm signal includes: The state of the battery under test is detected based on a capacitor discharge model, which satisfies the following relationship: Among them, V c V is the residual voltage value. s Let be the initial voltage when charging stops, e be the natural constant, t be the time elapsed from the start of discharge to the current sampling time, R be the discharge resistance, and C be the capacitance at time t.

10. The battery testing method of the battery testing device according to claim 7, characterized in that, The step of receiving the alarm signal and issuing alarm information through the alarm module includes: In response to the alarm signal, the alarm information is presented in a first display format; And / or receive the alarm signal and present the alarm information in a second display format; The first display format and the second display format are different ways of presenting information.

Images