Lithium battery charging and discharging socket for preventing thermal runaway of battery pack

Abstract

A lithium battery charging and discharging socket for preventing thermal runaway of a battery pack belongs to the technical field of lithium battery charging and discharging. In order to solve the problems that the thermal runaway phenomenon of a battery pack exists during charging and discharging of an existing lithium battery, and safe charging and discharging of the lithium battery are not facilitated, a jack of a charging and discharging socket is respectively connected with a positive electrode insert pin, a negative electrode insert pin and a grounding insert pin, a positive electrode large wire and a temperature transmission wire are welded on the positive electrode insert pin, and a negative electrode large wire is welded on the negative electrode insert pin; the thermal runaway prevention and control circuit comprises an NE555, a resistor R1, a resistor R2, a thermistor RT1, a thermistor RT2, an adjustable resistor RP1, an adjustable resistor RP2, a capacitor C1, a diode VD2, a light emitting diode LED1, a light emitting diode LED2 and an electromagnetic relay K; a normally open contact of the electromagnetic relay K is connected in series with the alarm; and the temperature transmission line is connected with the thermistor RT1 and the thermistor RT2 at the same time. The device is used for carrying out thermal runaway monitoring and low-temperature charging and discharging on the lithium battery.

Description

TECHNICAL FIELD

[0001] The utility model relates to a lithium battery charging and discharging socket preventing battery pack thermal runaway belongs to lithium battery charging and discharging technical field. BACKGROUND

[0002] Lead-acid storage battery is the most widely used power supply at present, however, with the rapid development of electric bicycles, the trend of two-wheeled electric vehicle lithium is gradually obvious, and it is inevitable to replace heavy lead-acid battery with portable and safe lithium battery.

[0003] Lithium battery is favored by the majority of electric bicycle consumers with its high working voltage, large specific energy, small size, light weight, long cycle life and other advantages, in addition, the rapid development of the society and the improvement of people's living standards and the enhancement of environmental protection consciousness make it have very broad prospects and market, and most of the electric bicycles now adopt lithium ion battery pack as the power battery.

[0004] Battery pack thermal runaway is a phenomenon that the heat chain reaction occurs inside the battery, leading to a sharp rise in temperature, and possibly causing safety accidents, which is particularly common in lithium ion batteries, mainly due to chemical reactions and physical changes inside the battery. Therefore, how to effectively monitor the thermal runaway phenomenon of the battery pack is necessary for the safe charging and discharging of lithium batteries.

[0005] In addition, lithium battery charging and discharging also has the condition of poor charging acceptance and insufficient charging of lithium battery in low temperature environment. INVENTION CONTENTS

[0006] The utility model aims at solving the problem of existing lithium battery charging and discharging that battery pack thermal runaway phenomenon is not conducive to lithium battery safe charging and discharging, and provides a lithium battery charging and discharging socket preventing battery pack thermal runaway.

[0007] The utility model discloses a lithium battery charging and discharging socket preventing battery pack thermal runaway,

[0008] It comprises: positive electrode inlay needle, negative electrode inlay needle, ground inlay needle, positive electrode large line, negative electrode large line, temperature transmission line and thermal runaway prevention and control circuit.

[0009] The jack of the charging and discharging socket is respectively connected with the positive electrode inlay needle, the negative electrode inlay needle and the ground inlay needle, the positive electrode inlay needle is welded with the positive electrode large line and the temperature transmission line, and the negative electrode inlay needle is welded with the negative electrode large line.

[0010] The thermal runaway prevention and control circuit comprises NE555, resistor R1, resistor R2, thermistor RT1, thermistor RT2, adjustable resistor RP1, adjustable resistor RP2, capacitor C1, diode VD2, light emitting diode LED1, light emitting diode LED2 and electromagnetic relay K.

[0011] The THR port of the NE555 is connected with one end of the thermistor RT1 and one fixed end of the adjustable resistor RP1, the TR port of the NE555 is connected with one end of the thermistor RT2 and one fixed end of the adjustable resistor RP2, the CV port of the NE555 is connected with one end of the capacitor C1, the OUT port of the NE555 is connected with the cathode of the light emitting diode LED1, the anode of the light emitting diode LED2, one end of the electromagnetic relay K coil and the anode of the diode VD2, the anode of the light emitting diode LED1 is connected with one end of the resistor R1, the cathode of the light emitting diode LED2 is connected with one end of the resistor R2, the power supply VDD is connected with the VCC port of the NE555, the RESET port of the NE555, the other end of the thermistor RT1, the other end of the thermistor RT2, the other end of the resistor R1, the other end of the electromagnetic relay K coil and the cathode of the diode VD2, the ground is connected with the ground of the NE555, the other fixed end of the adjustable resistor RP1, the movable contact of the adjustable resistor RP1, the other fixed end of the adjustable resistor RP2, the movable contact of the adjustable resistor RP2, the other end of the capacitor C1 and the other end of the resistor R2;

[0012] The normally open contact of the electromagnetic relay K is connected with the alarm in series;

[0013] The temperature transmission wire is connected with the thermistor RT1 and the thermistor RT2.

[0014] Preferably, the thermal runaway prevention and control circuit further comprises an electromagnetic relay J and a diode VD1;

[0015] One end of the electromagnetic relay J coil is connected to the OUT port of the NE555, and the other end is connected to the ground;

[0016] The cathode of the diode VD1 is connected to the OUT port of the NE555, and the anode is connected to the ground;

[0017] The normally open contact of the electromagnetic relay J is connected with the electric heater in series.

[0018] Preferably, the thermal runaway prevention and control circuit is placed in an upper limit temperature environment, and the sliding contact of the adjustable resistor RP1 is adjusted until the light emitting diode LED1 emits light;

[0019] The thermal runaway prevention and control circuit is placed in a lower limit temperature environment, and the sliding contact of the adjustable resistor RP2 is adjusted until the light emitting diode LED2 emits light.

[0020] Preferably, the positive inlay needle is welded with the positive large wire and the temperature transmission wire through tin soldering;

[0021] The negative inlay needle is welded with the negative large wire through tin soldering.

[0022] Preferably, the thermal runaway prevention and control circuit is powered by a stabilized power supply.

[0023] The lithium battery charging and discharging socket for preventing thermal runaway of a battery pack has the advantages that: the upper limit temperature and the lower limit temperature of the charging and discharging socket can be set arbitrarily through the adjustable resistors RP1 and RP2, flexible temperature setting of different regions is realized, and different regional environments are adapted to. The charging and discharging socket can work below the upper limit temperature, and an alarm signal is sent when the upper limit temperature is exceeded, so that the thermal runaway phenomenon of the charging and discharging socket in the charging and discharging process is avoided. In addition, the charging and discharging socket can also work above the lower limit temperature, and heating and insulation setting is performed on the charging and discharging socket when the lower limit temperature is lower than the lower limit temperature, so that the charging and discharging process of the charging and discharging socket in a low-temperature region is avoided due to the excessively low temperature. BRIEF DESCRIPTION OF DRAWINGS

[0024] Figure 1 is a structural schematic view of the lithium battery charging and discharging socket for preventing thermal runaway of a battery pack according to the present application;

[0025] Figure 2 is a schematic view of the thermal runaway prevention and control circuit according to the present application;

[0026] Figure 3 is Figure 1 A view of the present application;

[0027] Figure 4 is Figure 1 B view of the present application. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.

[0029] It should be noted that the embodiments in the present application and the features in the embodiments can be combined with each other without conflict.

[0030] The present application will be further described below with reference to the drawings and specific embodiments, but the present application is not limited by the present application.

[0031] Embodiment 1:

[0032] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application. Figures 1-4The embodiment is illustrated, and the lithium battery charging and discharging socket for preventing thermal runaway of the battery pack comprises a positive needle 1, a negative needle 2, a grounding needle 3, a positive large wire 4, a negative large wire 5, a temperature transmission wire 6 and a thermal runaway prevention circuit 7.

[0033] The charging and discharging socket is respectively connected with the positive needle 1, the negative needle 2 and the grounding needle 3, the positive large wire 4 and the temperature transmission wire 6 are welded on the positive needle 1, and the negative large wire 5 is welded on the negative needle 2.

[0034] The thermal runaway prevention circuit 7 comprises an NE555, a resistor R1, a resistor R2, a thermistor RT1, a thermistor RT2, an adjustable resistor RP1, an adjustable resistor RP2, a capacitor C1, a diode VD2, a light emitting diode LED1, a light emitting diode LED2 and an electromagnetic relay K.

[0035] The THR port of the NE555 is connected with one end of the thermistor RT1 and one fixed end of the adjustable resistor RP1, the TR port of the NE555 is connected with one end of the thermistor RT2 and one fixed end of the adjustable resistor RP2, the CV port of the NE555 is connected with one end of the capacitor C1, the OUT port of the NE555 is connected with the cathode of the light emitting diode LED1, the anode of the light emitting diode LED2, one end of the electromagnetic relay K coil and the anode of the diode VD2, one end of the resistor R1 is connected with the anode of the light emitting diode LED1, one end of the resistor R2 is connected with the cathode of the light emitting diode LED2, the power supply VDD is connected with the VCC port of the NE555, the RESET port of the NE555, the other end of the thermistor RT1, the other end of the thermistor RT2, the other end of the resistor R1, the other end of the electromagnetic relay K coil and the cathode of the diode VD2, and the ground end is connected with the ground end of the NE555, the other fixed end of the adjustable resistor RP1, the movable contact of the adjustable resistor RP1, the other fixed end of the adjustable resistor RP2, the movable contact of the adjustable resistor RP2, the other end of the capacitor C1 and the other end of the resistor R2.

[0036] The normally open contact of the electromagnetic relay K is connected with the alarm in series.

[0037] The temperature transmission wire 6 is connected with the thermistor RT1 and the thermistor RT2.

[0038] Further, the thermal runaway prevention circuit 7 further comprises an electromagnetic relay J and a diode VD1.

[0039] One end of the electromagnetic relay J coil is connected to the OUT port of the NE555, and the other end is connected to the ground end.

[0040] The cathode of the diode VD1 is connected to the OUT port of the NE555, and the anode is connected to the ground end.

[0041] The normally open contact of the electromagnetic relay J is connected in series with the electric heater.

[0042] Further, the thermal runaway prevention circuit 7 is placed in an upper limit temperature environment, and the sliding contact of the adjustable resistor RP1 is adjusted until the light emitting diode LED1 emits light.

[0043] The thermal runaway prevention circuit 7 is placed in a lower limit temperature environment, and the sliding contact of the adjustable resistor RP2 is adjusted until the light emitting diode LED2 emits light.

[0044] Further, the positive needle 1 is welded with the positive large line 4 and the temperature transmission line 6 through tin soldering.

[0045] The negative needle 2 is welded with the negative large line 5 through tin soldering.

[0046] Further, the thermal runaway prevention circuit 7 is powered by a stabilized power supply.

[0047] In the utility model, the working temperature of the charging and discharging socket can be set at will, when the working temperature range is adjusted, firstly, the upper limit temperature is adjusted, the thermal runaway prevention circuit 7 is placed in an upper limit temperature environment, and stays for a period of time, so that the thermistor RT1 reaches thermal equilibrium with the environment, the sliding contact of the adjustable resistor RP1 is adjusted until the light emitting diode LED1 emits light, in order to ensure the accuracy of data, the adjustment can be repeated several times. Then, the lower limit temperature is adjusted, the thermal runaway prevention circuit 7 is placed in a lower limit temperature environment, and stays for a period of time, so that the thermistor RT2 reaches thermal equilibrium with the environment, the sliding contact of the adjustable resistor RP2 is adjusted until the light emitting diode LED2 emits light.

[0048] In combination Figures 1-4 The working principle of the utility model is explained as follows: the charging and discharging socket is respectively connected with the positive needle 1, the negative needle 2 and the grounding needle 3, the positive needle 1 is welded with the positive large line 4 and the temperature transmission line 6 through tin soldering, and the negative needle 2 is welded with the negative large line 5 through tin soldering. The temperature transmission line 6 is connected with the thermistor RT1 and the thermistor RT2, and the thermistor RT1 and the thermistor RT2 obtain the temperature of the charging and discharging socket in real time through the temperature transmission line 6 in the thermal runaway prevention process. The thermistor RT1 and the adjustable resistor RP1 constitute upper limit temperature detection resistance, and the thermistor RT2 and the adjustable resistor RP2 constitute lower limit temperature detection resistance. When the temperature rises to more than the upper limit temperature, the 6th pin potential of the NE555 is higher than 2 / 3VDD, the 3rd pin outputs low level, the electromagnetic relay coil K is electrified, the alarm connected in series with the normally open contact is electrified, an alarm signal is sent, the charging and discharging socket works below the upper limit temperature range, and the thermal runaway phenomenon of the charging and discharging socket in the charging and discharging process is avoided.

[0049] When the temperature drops below the lower limit temperature, the pin 6 of NE555 is lower than 1 / 3VDD, the pin 3 outputs high level, the electromagnetic relay coil J is powered, the normally open contact is attracted, and the electric heater connected in series with the normally open contact is powered to start heating.

[0050] While the application has been described with reference to particular embodiments thereof, it should be understood that the examples are merely illustrative of the principles and applications of the application. It will thus be appreciated that numerous modifications can be made to the illustrative embodiments and that other arrangements can be devised without departing from the spirit and scope of the present application as defined by the appended claims. It will be understood that the features described with reference to individual embodiments can be used in other embodiments.

Claims

1. A lithium battery charging and discharging socket for preventing thermal runaway of the battery pack, characterized in that, It includes: Positive electrode pin (1), negative electrode pin (2), grounding pin (3), positive electrode wire (4), negative electrode wire (5), heat transfer wire (6) and thermal runaway prevention circuit (7); The charging and discharging socket is connected to a positive electrode pin (1), a negative electrode pin (2) and a grounding pin (3) respectively. A positive electrode wire (4) and a heat transfer wire (6) are soldered on the positive electrode pin (1), and a negative electrode wire (5) is soldered on the negative electrode pin (2). The thermal runaway prevention circuit (7) includes NE555, resistors R1 and R2, thermistors RT1 and RT2, adjustable resistors RP1 and RP2, capacitor C1, diode VD2, light-emitting diodes LED1 and LED2, and electromagnetic relay K. The NE555's THR port is connected to one end of the thermistor RT1 and one fixed end of the adjustable resistor RP1. The NE555's TR port is connected to one end of the thermistor RT2 and one fixed end of the adjustable resistor RP2. The NE555's CV port is connected to one end of capacitor C1. The NE555's OUT port is connected to the cathode of LED1, the anode of LED2, one end of the electromagnetic relay K coil, and the anode of diode VD2. The anode of LED1 is connected to one end of resistor R1. LED2... The cathode of the resistor is connected to one end of the resistor R2. The power supply VDD is simultaneously connected to the VCC port of the NE555, the RESET port of the NE555, the other end of the thermistor RT1, the other end of the thermistor RT2, the other end of the resistor R1, the other end of the coil of the electromagnetic relay K, and the cathode of the diode VD2. The ground terminal is simultaneously connected to the ground terminal of the NE555, the other fixed terminal of the adjustable resistor RP1, the moving contact of the adjustable resistor RP1, the other fixed terminal of the adjustable resistor RP2, the moving contact of the adjustable resistor RP2, the other end of the capacitor C1, and the other end of the resistor R2. The normally open contact of the electromagnetic relay K is connected in series with the alarm. The temperature transmission line (6) is connected to both thermistors RT1 and RT2.

2. A lithium battery charging and discharging socket for preventing thermal runaway of a battery pack according to claim 1, characterized in that, The thermal runaway prevention circuit (7) also includes an electromagnetic relay J and a diode VD1; One end of the electromagnetic relay J coil is connected to the OUT port of the NE555, and the other end is connected to the ground terminal; The cathode of diode VD1 is connected to the OUT port of NE555, and the anode is connected to the ground terminal; The normally open contact of the electromagnetic relay J is connected in series with the electric heater.

3. A lithium battery charging and discharging socket for preventing thermal runaway of a battery pack according to claim 1, characterized in that, Place the thermal runaway prevention circuit (7) in the upper limit temperature environment and adjust the sliding contact of the adjustable resistor RP1 until the light-emitting diode LED1 lights up; Place the thermal runaway prevention circuit (7) in a lower limit temperature environment and adjust the sliding contact of the adjustable resistor RP2 until the light-emitting diode LED2 lights up.

4. A lithium battery charging and discharging socket for preventing thermal runaway of a battery pack according to claim 1, characterized in that, The positive electrode insert (1) is soldered to the positive electrode wire (4) and the heat transfer wire (6) by soldering; The negative electrode insert (2) is soldered to the negative electrode wire (5) by soldering.

5. A lithium battery charging and discharging socket for preventing thermal runaway of a battery pack according to claim 1, characterized in that, The thermal runaway prevention circuit (7) is powered by a regulated power supply.

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