A rechargeable battery separator

Abstract

A rechargeable battery diaphragm, comprising the following components: a rechargeable battery shell, a battery negative pole, a battery positive pole, a diaphragm, a heat generating layer, a heat generating layer connector I, a heat generating layer connector II, a battery input / output negative pole, a battery input / output positive pole, a management circuit, the battery negative pole, the battery positive pole, the diaphragm, and the heat generating layer are placed in the rechargeable battery shell, the heat generating layer connector I, the heat generating layer connector II, the battery input / output negative pole, and the battery input / output positive pole extend outside the rechargeable battery shell, the heat generating layer connector I and the battery input / output negative pole are in conduction and connected to the management circuit through a conductor, characterized in that: the heat generating layer is placed in the diaphragm, the heat generating layer connector I, the heat generating layer connector II, and the battery positive pole are connected to the management circuit through a conductor.

Description

Technical Field

[0001] This invention relates to the field of rechargeable batteries. This novel rechargeable battery separator and heating element can optimize the charging and discharging speed of rechargeable batteries in low-temperature environments, improve the battery capacity in low-temperature environments, and extend the battery life. At the same time, it provides support for battery temperature and health management. Background Technology

[0002] Previously, fast charging of rechargeable batteries mainly relied on high current, which damaged battery life and resulted in low electrochemical efficiency. Especially in low-temperature environments, the charging and discharging speed and battery capacity were significantly affected by temperature, severely impacting battery efficiency. Currently, there are two methods for heating batteries: external heating of the battery pack and heating during charging. External heating methods include adding circulating water to the battery pack and then heating the circulating water to heat the individual battery cells, and directly heating the individual battery cells with electric heating pads. Although the methods of heating the individual battery cells by heating the circulating water and heating the individual battery cells with electric heating pads are simple, they take a long time. According to data from the internet, it usually takes more than 20 minutes to heat the individual battery cells from 0 degrees Celsius to 20 degrees Celsius. The time spent heating during charging is too long, and heating during battery operation may be counterproductive for battery packs with limited capacity. Internal heating methods include pulse heating during charging. Although this method is simple and has a fast heating speed, it is very likely to affect battery life. The separator in the existing technology is a flexible material that conducts ionic charges and insulates against electrons. It is usually used as electronic insulation between the positive and negative electrodes of rechargeable batteries. Summary of the Invention

[0003] To address the aforementioned problems, the present invention aims to provide a separator that not only has high heating efficiency, which is highly beneficial for improving the electrochemical reaction rate and extending battery life, but also increases battery capacity under low-temperature conditions, and is inexpensive and simple to manufacture.

[0004] To achieve the above objectives, the technical solution adopted by the present invention is as follows: A separator is provided, which consists of an insulating layer (separator) and a heating layer. Specifically, the middle of the separator in existing rechargeable battery technology is hollowed out, and the heating layer is placed in the middle of the hollowed-out separator. After ensuring that the heating layer placed in the hollowed-out separator is electronically insulated from any electrode of the battery, only two connectors of the heating layer are exposed. One of the connectors of the heating layer can be connected to either end of the battery's input / output terminal externally via a conductor. The other connector of the heating layer is connected to a management circuit via a conductor. The heating layer can be directly connected to an external power source and the power output from the battery itself via the management circuit. While serving as a heating element, the heating layer also functions as a thermal sensor. When used as a thermal sensor, a certain proportion of a thermistor-sensitive material, i.e., a material whose resistance changes significantly with temperature, can be mixed into the heating layer to achieve the thermal sensor function. The management circuit consists of a CPU, a corresponding drive circuit, and a corresponding driver program. The heating layer, while acting as a heat source, is connected to the management circuit as a thermal sensor.

[0005] The diaphragm, as described above, is an insulating membrane in the prior art that conducts ionic charges. In this invention, the interior of the diaphragm is hollowed out, and a heating layer is installed in the hollowed-out diaphragm cavity.

[0006] The heating layer is encapsulated within a diaphragm, and the heating layer may also be a semiconductor with a PN junction;

[0007] The heating layer is also used as a thermal sensor. When used as a thermal sensor, the internal temperature of the battery is determined by measuring the change in its resistance. The specific implementation is achieved by the corresponding electronic device. Since it is a mature technology, it will not be described in detail.

[0008] The heating layer, in a rechargeable battery with a very abundant electrolyte, such as a lead-acid battery, can be wrapped with any insulating layer and placed in any position within the battery.

[0009] The management circuit includes a CPU, a drive unit, and corresponding drivers and an image display window. It also includes a sampling amplification circuit. The heating layer, while serving as a heat source, is also placed in the circuit as a thermal sensor to provide the internal temperature of the battery and thereby determine the battery's health status and provide safety warnings. It can be located in a specific position within the power battery pack.

[0010] Through the above design scheme, the present invention can bring the following beneficial effects:

[0011] 1. The technical solution of the present invention can improve the electrochemical reaction rate under low temperature environment, that is, effectively improve the charging and discharging speed and increase the charge ratio, relative to the battery capacity under normal temperature environment;

[0012] 2. The technical solution of this invention has a simple structure and excellent cost performance;

[0013] 3. Since the present invention uses the heating layer as a thermal sensor and is evenly distributed in the battery, it not only provides a thermal sensor for precise control of battery temperature, but also provides a reuse method for accurate fault diagnosis, optimal charging current at different temperatures, and battery management, making human-machine interaction maintenance more convenient and even providing safety warnings. Attached Figure Description

[0014] Figure 1 This is a main illustration of an embodiment of the present invention;

[0015] Figure 2 This is a side view of an embodiment of the present invention;

[0016] Figure 3 For along Figure 1 A cross-sectional view along line AA in the middle.

[0017] 1-Rechargeable battery casing, 2-Battery negative terminal, 3-Battery positive terminal, 4-Separator, 5-Heating layer, 6-Heating layer connector I, 7-Heating layer connector II, 8-Battery input / output terminal negative terminal, 9-Battery input / output terminal positive terminal, 10-Management circuit. Detailed Implementation

[0018] The embodiments of the present invention will now be described with reference to the accompanying drawings.

[0019] As shown in the figure, the heating layer 5 is wrapped inside the separator 4, which is placed between the positive electrode 2 and the negative electrode 3 of the battery. The heating layer 5, separator 4, positive electrode 2, and negative electrode 3 are placed inside the rechargeable battery casing 1. The negative electrode 8, positive electrode 9, heating layer connector I 6, and heating layer connector II 7 extend out of the rechargeable battery casing 1 through conductors. Heating layer connector I 6 and negative electrode 2 are connected by conductors, and then connected to the management circuit 10 through conductors. At the same time, the positive electrode 3 and heating layer connector II... All 7 are connected via conductors and management circuit 10. During charging in a low-temperature environment, management circuit 10 uses heating layer 5 as a thermal sensor to measure the internal temperature of the battery to be charged and obtains the corresponding data. The CPU in management circuit 10 analyzes the data and instructs the external power supply to apply a given power to heating layer 5. Heating layer 5 heats the battery, increasing the battery temperature. Simultaneously, the resistance value of heating layer 5 changes. Management circuit 10 samples the voltage across heating layer 5 or the change in current flowing through heating layer 5, amplifies it, and sends it to the CPU in management circuit 10. (This process can also involve heating for a certain period of time, then stopping heating and waiting for heating layer 5 and the battery to regenerate.) (The method of measuring the resistance value when the internal temperature of the battery is approximately uniform is used to achieve more accurate measurement of the internal temperature during battery charging.) After calculation and analysis, the CPU in the management circuit 10 can execute any instruction to charge, heat, or stop heating, thereby realizing the charging thermal management of the battery. When the battery is running in a low-temperature environment, the heating layer 5 acts as a thermal sensor to send the internal temperature of the battery to the CPU in the management circuit 10. When the CPU in the management circuit 10 calculates and analyzes that heating is required, it issues an instruction to apply the battery power output from the negative input / output terminal 8 and the positive input / output terminal 9 of the battery to the heating layer connector I of the heating layer 5 through the drive circuit and driver program. 6 and Heating Layer Connector II 7, Heating Layer 5 starts heating the battery, the battery SOC increases, and at the same time, Heating Layer 5 acts as a thermal sensor to continuously transmit the real-time battery temperature to the CPU. The CPU calculates and analyzes, and when it is necessary to stop heating, the CPU in the management circuit 10 disconnects the path between the battery power supply and Heating Layer 5 through the driver and drive device, and Heating Layer 5 stops heating. When the battery is running at normal temperature, Heating Layer 5 is used as a thermal sensor and transmits the internal temperature of the battery to the display window through the management circuit 10. When the temperature of a battery cell is abnormal, the temperature is calculated and analyzed by the CPU and a location indication is given for timely repair and replacement. In special cases, corresponding danger alarms are provided.

Claims

1. A rechargeable battery separator, comprising the following components: a rechargeable battery housing (1), a battery negative electrode (2), a battery positive electrode (3), a separator (4), a heating layer (5), a heating layer connector I (6), a heating layer connector II (7), a battery input / output terminal negative electrode (8), a battery input / output terminal positive electrode (9), and a management circuit (10), wherein the battery negative electrode (2), the battery positive electrode (3), the separator (4), and the heating layer (5) are placed inside the rechargeable battery housing (1), and the heating layer connector I (6), the heating layer connector II (7), the battery input / output terminal negative electrode (8), and the battery input / output terminal positive electrode (9) extend outside the rechargeable battery housing (1), and the heating layer connector I (6) and the battery input / output terminal negative electrode (8) are connected and the management circuit (10) is connected by a conductor, characterized in that: The heating layer (5) is located between the negative electrode (2) and the positive electrode (3) of the battery, inside the separator (4). The heating layer connector I (6), the heating layer connector II (7), the positive electrode (3) of the battery, and the management circuit (10) are connected by conductors.

2. A rechargeable battery separator according to claims 1 and 2, characterized in that: The management circuit (10) includes a CPU, a sampling amplifier circuit, a driver circuit, and a corresponding driver program.

3. A rechargeable battery separator according to claim 2, characterized in that: The heating layer (5) is distributed between the negative electrode (2) and the positive electrode (3) of the battery as a heat sensor.

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