Battery safety early warning system

Abstract

The utility model discloses a battery safety early warning system which comprises a shell, a battery component arranged in the shell and a detection component arranged between the battery component and the shell, and the detection component comprises a thin film pressure sensor and a control mainboard. And the control main board can obtain an electric signal generated when the thin film pressure sensor receives an external force. According to the application, the thin film pressure sensor is assembled on the shell close to the battery component in the device, and is electrically connected to the control mainboard of the mobile terminal. When the battery expands, the sensor transmits pressure data to the control mainboard in real time, and the control chip of the mainboard can judge the expansion degree of the battery by analyzing the data.

Description

TECHNICAL FIELD

[0001] The utility model relates to battery detection field especially relates to a battery safety early warning system. BACKGROUND

[0002] The battery is used for a long time or has bad use habits, and the service life has been reduced below the normal range, at this time, although it will not cause damage to the machine, it will affect the user's use experience, such as increasing the charging time, greatly reducing the endurance time, etc.

[0003] The battery itself fails, and a large current is generated, which can damage the internal circuit of the machine or other electrical equipment, and even cause the equipment to catch fire.

[0004] The battery swells due to internal or external reasons, which may squeeze the handheld terminal shell, making it impossible to use the device normally, and there may be hidden dangers such as fire.

[0005] The prior art related to battery protection generally obtains the current or voltage signal of the battery through a hardware circuit, and once the detection value exceeds the safe range, the battery connection is disconnected from the hardware. This technology can control the use of the battery within a safe range to ensure that the control unit is not damaged. However, there are the following shortcomings:

[0006] (1) unable to detect the degree of battery swelling;

[0007] (2) for battery management, only the possibility of using dangerous batteries can be reduced, and the safety status of the battery cannot be warned in advance to solve the problem in advance. INVENTION CONTENTS

[0008] The main purpose of the utility model is to provide a battery safety early warning system, which aims to solve the above technical problems.

[0009] To achieve the above purpose, the utility model provides a battery safety early warning system which comprises a shell, a battery component arranged in the shell, and a detection component arranged between the battery component and the shell. The detection component comprises a thin film pressure sensor and a control mainboard. The control mainboard can obtain the electrical signal generated by the thin film pressure sensor when it is subjected to external force.

[0010] In an embodiment, the thin film pressure sensor and the battery component have a gap therebetween.

[0011] In an embodiment, the thin film pressure sensor and the battery component are in abutting connection.

[0012] In an embodiment, the center part of the thin film pressure sensor has a circular crimping part.

[0013] In an embodiment, the center of the thin film pressure sensor coincides with the geometric center of the battery component.

[0014] In an embodiment, the area of the circular crimping part is smaller than the area of the battery component.

[0015] In an embodiment, the thin film pressure sensor has a connecting part connected with the control mainboard.

[0016] In an embodiment, the detection component further comprises a detection circuit electrically connected with the battery component and used for detecting the voltage and the data of charging and discharging current of the battery component.

[0017] In the technical scheme of the utility model, the battery safety early warning system comprises a shell, a battery component arranged in the shell and a detection component arranged between the battery component and the shell, the detection component comprises a thin film pressure sensor and a control mainboard, and the control mainboard can acquire the electric signal generated by the thin film pressure sensor when the thin film pressure sensor receives external force. Therefore, in the technical scheme, the thin film pressure sensor is assembled on the shell close to the battery component in the device, and the thin film pressure sensor is electrically connected to the control mainboard of the mobile terminal. When the battery swells, the sensor can transmit the pressure data to the control mainboard in real time, and the control chip of the mainboard can judge the swelling degree of the battery by analyzing the data. BRIEF DESCRIPTION OF DRAWINGS

[0018] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or the prior art, the following will briefly introduce the drawings needed to be used in the embodiment or the prior art description, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained from the structure shown in the drawings without creative labor.

[0019] Figure 1 It is a structural schematic view of the battery safety early warning system of the embodiment of the utility model.

[0020] Figure 2 It is a structural schematic view of the thin film pressure sensor of the embodiment of the utility model.

[0021] Figure 3 It is a data detection schematic view of the battery component of the embodiment of the utility model.

[0022] Explanation of reference numerals: 10, shell;20, detection component;21, thin film pressure sensor;22, connecting part;30, battery component.

[0023] The purpose, functional characteristics and advantages of the utility model will be further explained by combining with the embodiments and referring to the drawings. Detailed Implementation

[0024] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0025] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in this utility model embodiment are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0026] Furthermore, in this utility model, the use of terms such as "first," "second," etc., is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "multiple" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0027] Furthermore, the technical solutions of the various embodiments of this utility model can be combined with each other, but only if they are based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0028] This invention provides a battery safety early warning system.

[0029] like Figures 1-2 As shown, the battery safety warning system provided in this embodiment of the present invention includes a housing 10, a battery component 30 disposed within the housing 10, and a detection component 20 disposed between the battery component 30 and the housing 10. The detection component 20 includes a thin-film pressure sensor 21 and a control motherboard. The control motherboard can acquire the electrical signal generated by the thin-film pressure sensor 21 when it receives an external force.

[0030] In the embodiment, the battery safety warning system comprises a shell 10, a battery component 30 arranged in the shell 10, and a detection component 20 arranged between the battery component 30 and the shell 10, wherein the detection component 20 comprises a thin film pressure sensor 21 and a control mainboard, and the control mainboard can acquire an electric signal generated by the thin film pressure sensor 21 when the thin film pressure sensor 21 receives an external force. Therefore, in the technical solution, the thin film pressure sensor 21 is arranged on the shell 10 close to the battery component 30 in the device, and is electrically connected to the control mainboard of the mobile terminal. When the battery swells, the sensor transmits pressure data to the control mainboard in real time, and the control chip of the mainboard can determine the swelling degree of the battery by analyzing the data.

[0031] Please refer to Figure 2 The thin film pressure sensor 21 has a connection part 22 connected with the control mainboard, which can be connected through a connector or directly welded, and the thin film pressure sensor 21 is a functional area of the pressure sensor, which is used to detect the swelling degree of the battery component 30.

[0032] The thin film pressure sensor 21 is arranged between the battery component 30 and the shell 10, and can be closely attached or have a gap between the battery component 30 and the thin film pressure sensor 21, and the main functional area of the thin film pressure sensor 21 (that is, the circular crimping part 23 located at the center of the thin film pressure sensor 21) is required to be overlapped with the battery with the largest area, so as to ensure that the thin film pressure sensor 21 can timely detect the swelling of the battery component 30 when the battery component 30 swells.

[0033] During the use of the lithium battery in the handheld terminal (including but not limited to the terminal of the battery safety warning system provided in the application), the swelling degree is the most serious at the geometric center of the lithium battery and decreases towards the periphery. Therefore, when installing the sensor, the center of the thin film pressure sensor 21 (that is, the circular crimping part 23) is overlapped with the geometric center of the battery component 30. Of course, in other embodiments, when the geometric centers of the two are not overlapped, the purpose of detecting whether the battery component 30 swells can also be achieved.

[0034] Optionally, the area of the circular crimping part 23 is smaller than the area of the battery component 30, so as to more stably detect.

[0035] The thin film pressure sensor 21 is internally made of piezoelectric material. When external force is received, the internal electrical properties change, resulting in changes in the data obtained by the terminal mainboard from the sensor, i.e., the measured resistance value. Generally, the greater the external force received, the smaller the measured resistance value. Through ADC (analog-to-digital converter) and resistance-pressure conversion calculation, the terminal mainboard can clearly understand the size of the pressure received by the sensor, and through the optimization algorithm, some measurement value mutations caused by external force can be screened out to stably monitor the swelling degree of the battery.

[0036] As shown in Figure 3 A detection circuit 40 is added between the downstream of the battery and the upstream of the modules such as the control mainboard / panel / equipment, etc. that are powered. Through the detection circuit 40, the voltage of the battery and the data of the charging and discharging current can be detected.

[0037] The voltage value of the battery measured by the detection circuit 40 is usually converted into the current power of the device through calculation and displayed;

[0038] The charging current of the battery measured by the detection circuit 40, combined with the charging time, can calculate the current capacity of the battery. The battery capacity is an important indicator of the battery health. As the use time increases and the number of charging and discharging increases, the battery capacity will inevitably decrease, resulting in shorter battery life under the same power (i.e., the same electromotive force / voltage across the battery), and affecting the electrical performance of the battery, resulting in longer charging time;

[0039] The discharge time and discharge current of the battery measured by the detection circuit 40 are also methods for measuring the current capacity of the battery;

[0040] Power calculation: The current power percentage of the battery can be calculated by detecting the output voltage of the battery:

[0041] Most lithium batteries now come with a protection board. When the output voltage is lower than a certain value, the battery no longer supplies power to the device. At this time, the battery only has internal self-consumption and protection board consumption, which can greatly reduce the damage to the battery caused by over-discharge.

[0042] Taking a small capacity battery as an example, the charging limit voltage of the battery is 4.4V, and the discharge cutoff voltage is 3.0V. The power percentage of the battery can be calculated as follows:

[0043] Power percentage = (detected voltage value U-discharge cutoff voltage) / (charging limit voltage-discharge cutoff voltage) x 100%

[0044] That is, power percentage = (U-3.0) / (4.4-3.0) x 100%.

[0045] Calculate the battery capacity:

[0046] ①Charging time to calculate battery capacity:

[0047] The unit of battery capacity is mA·h, mA is the unit of current, and h is the unit of time (hour).

[0048] Similarly, taking a small capacity battery as an example, a battery capacity of 240mA·h means that if the battery is charged at a current of 48mA when the battery has not output voltage, it needs to charge about 240mA·h÷48mA=5h battery to be full.

[0049] Therefore, when charging, if the time is divided into a very small unit, the current measured in each unit time is multiplied by the unit time, and the values in a period of time are accumulated (that is, the current is integrated, and the specific data and integration time are calculated by the actual measured data) is the capacity of the battery in this period of time.

[0050] ②Similar to the above description, the battery capacity data can also be obtained by integrating the discharge current of the battery (from the time when the battery output voltage is the charging limit voltage to the discharge cutoff voltage) during discharge.

[0051] Through multiple data recording and analysis of the charging and discharging process, the user's usage habits can be known, the battery health model can be established, the battery health change trend can be predicted, and the device with battery health below a certain index can be warned and pushed, so as to remind the user to pay attention to the battery health in advance.

[0052] The above is only the preferred embodiment of the present application, and does not limit the patent range of the present application, and any equivalent structural transformation made under the concept of the present application, or direct / indirect application in other related technical fields is included in the patent protection range of the present application.

Claims

1. A battery safety warning system, characterized by, The battery safety warning system comprises a shell (10), a battery component (30) arranged in the shell (10), and a detection component (20) arranged between the battery component (30) and the shell (10), wherein the detection component (20) comprises a thin film pressure sensor (21) and a control mainboard capable of acquiring an electric signal generated by the thin film pressure sensor (21) when an external force is applied.

2. The battery safety warning system of claim 1, wherein The thin film pressure sensor (21) and the battery component (30) have a gap therebetween.

3. The battery safety warning system of claim 1, wherein, The thin film pressure sensor (21) and the battery component (30) are in abutting connection.

4. The battery safety warning system of claim 1, wherein, The center of the thin film pressure sensor (21) has a circular crimping part.

5. The battery safety warning system of claim 4, wherein, The center of the thin film pressure sensor (21) coincides with the geometric center of the battery component (30).

6. The battery safety warning system of claim 5, wherein, The area of the circular crimping part is smaller than the area of the battery component (30).

7. The battery safety warning system of claim 1, wherein, The thin film pressure sensor (21) has a connecting part (22) connected with the control mainboard.

8. The battery safety warning system of claim 1, wherein, The detection component (20) further comprises a detection circuit electrically connected with the battery component (30) and used for detecting the voltage and the data of the charging and discharging current of the battery component (30).

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