Lithium ion battery equipment and safety early warning device

Abstract

The invention provides lithium ion battery equipment and a safety early warning device. According to the safety early warning device, fan blades are adopted to capture kinetic energy of gas released by a gas release hole, the kinetic energy is converted into electric energy through a generator, and then a signal transmitting end sends out a radio-frequency signal by means of the electric energy, so that a signal receiving end receives the radio-frequency signal and notifies a battery management system; therefore, the battery management system timely powers off the lithium ion battery, and further deterioration of the battery state is prevented. According to the safety early warning device disclosed by the invention, the kinetic energy of the gas released by the gas release hole can be converted into the electric energy and the alarm signal is sent to the battery management system at the moment that the safety valve of the lithium ion battery is opened, and the false alarm can be prevented, so that the aim of improving the safety early warning reliability of the lithium ion battery is fulfilled.

Description

Technical Field

[0001] The present invention relates to the technical field of lithium ion batteries, and in particular to a lithium ion battery device and a safety early warning device. Background Art

[0002] Lithium-ion batteries are secondary batteries that rely on the movement of lithium ions between positive and negative electrodes to achieve charge and discharge. They offer high energy density, long cycle life, and low self-discharge rates, and have been widely used in technologies such as portable electronic devices, electric vehicles, and energy storage systems. With the widespread use of lithium-ion batteries, their safety is receiving increasing attention from users, particularly the potential risk of thermal runaway, fire, and even explosion. Once an accident occurs, it not only causes financial loss but also poses a serious threat to human life. Therefore, improving the safety of lithium-ion battery applications has become an urgent issue for every industry.

[0003] The main safety risk of lithium-ion batteries lies in the fact that they are very prone to thermal runaway under abuse conditions. In addition, during the continuous operation of the battery, the battery materials will gradually age and degrade. The inconsistency between batteries will continue to increase during the cycle, which may eventually lead to the failure of a certain battery cell or even thermal runaway. Because lithium-ion batteries are composed of active electrode materials and organic electrolytes, and these electrolytes are highly flammable, in order to improve the safety of lithium-ion batteries, vent holes can be provided on the lithium-ion batteries, and safety valves can be installed in the vent holes. When the lithium-ion battery is in an abuse condition and a side reaction occurs inside it, the safety valve will open to discharge the gas inside the lithium-ion battery, reducing the risk of the lithium-ion battery exploding due to excessive internal air pressure.

[0004] While the provision of vents can improve the safety of lithium-ion batteries to a certain extent, a large amount of flammable and explosive gases will be ejected from the vents when the safety valve is opened. Furthermore, when the lithium-ion battery enters a state of thermal runaway, even more thermal runaway gases will be ejected, further increasing the risk of accidents. Therefore, to prevent the lithium-ion battery from further deteriorating and entering a state of thermal runaway after the safety valve is opened, it is necessary to install a safety warning device to monitor the operating status of the lithium-ion battery and take timely emergency measures when the lithium-ion battery experiences abnormal conditions.

[0005] Currently, lithium-ion battery safety warning devices typically determine whether a lithium-ion battery has experienced thermal runaway by detecting characteristic gases, identifying characteristic sounds, or processing image information. However, these methods often require additional maintenance and are subject to the potential for false alarms and missed warnings, making them unreliable in providing safety warnings for lithium-ion batteries. Summary of the Invention

[0006] A lithium-ion battery device and a safety warning device of the present invention are used to solve the problem of poor reliability of lithium-ion battery safety warning in the prior art, so as to achieve the purpose of improving the safety of lithium-ion batteries.

[0007] In a first aspect, the present invention provides a safety warning device for a lithium-ion battery, comprising:

[0008] a bracket, which is used to be assembled on the lithium-ion battery and is provided with a motor mounting slot;

[0009] a generator, which is mounted in the motor mounting slot and is provided with a rotating shaft;

[0010] a fan blade mounted on the rotating shaft and configured to be mounted at a position corresponding to the pressure relief hole of the lithium-ion battery, so as to rotate under the action of the exhaust pressure of the pressure relief hole and drive the generator to generate electrical energy through the rotating shaft;

[0011] a signal transmitter, whose power supply end is electrically connected to the output end of the generator and is configured to emit a radio frequency signal while generating electrical energy using the generator;

[0012] The signal receiving end includes a communication unit and is wirelessly connected to the signal transmitting end. The signal receiving end is configured to send an alarm signal to the battery management system through the communication unit after receiving the radio frequency signal.

[0013] Furthermore, the motor installation slot is further provided with a sealing cover plate, and the sealing cover plate is used to seal the generator inside the motor installation slot.

[0014] Furthermore, the sealing cover plate is provided with a wiring groove, and the wire connected to the output end of the generator is led out of the motor installation groove through the wiring groove.

[0015] Furthermore, the bracket includes a first support arm, a second support arm and a support cross plate, wherein:

[0016] The first support arm and the second support arm are respectively provided at both ends of the support cross plate in the length direction, and the first support arm and the second support arm are used to be connected to the lithium-ion battery so as to assemble the safety warning device to the lithium-ion battery;

[0017] The supporting transverse plate is used for being assembled above the top of the lithium-ion battery, the motor mounting groove is provided on the supporting transverse plate, and the fan blade is used for being hoisted above the pressure relief hole.

[0018] Furthermore, the first support arm is provided with a first mounting sleeve, the second support arm is provided with a second mounting sleeve, and the first mounting sleeve and the second mounting sleeve are used to be sleeved on the lithium-ion battery to assemble the safety warning device on the lithium-ion battery.

[0019] Furthermore, the supporting horizontal plate is provided with an electrode wiring hole, and the electrode wiring hole is used to facilitate the wiring of the battery tabs of the lithium-ion battery.

[0020] Furthermore, the bracket includes a third mounting sleeve, a fourth mounting sleeve, a connecting horizontal plate and a mounting column, wherein:

[0021] The third mounting sleeve and the fourth mounting sleeve are respectively provided at both ends of the connecting transverse plate in the length direction, and the third mounting sleeve and the fourth mounting sleeve are used to be sleeved on the lithium-ion battery to assemble the safety warning device on the lithium-ion battery;

[0022] The connecting horizontal plate is used to be assembled on one side of the lithium-ion battery, the bottom of the mounting column is set on the connecting horizontal plate, the motor mounting slot is set on the top of the mounting column, the blades of the fan blade adopt wind cups, and the fan blade is used to be installed vertically at a position corresponding to the air leakage hole.

[0023] Furthermore, the bracket includes a frame, and a clamping structure arranged at the bottom of the frame, wherein the bottom plate of the frame is provided with a through hole, and the motor mounting slot is provided on the top plate of the frame at a position corresponding to the through hole;

[0024] The clamping structure is used to assemble the bracket on the lithium-ion battery and is located between the battery tabs of the lithium-ion battery, and the position of the through hole corresponds to the position of the air vent.

[0025] Furthermore, the signal receiving end also includes a connection alarm, and the signal receiving end is further configured to control the alarm to send out an alarm signal after receiving the radio frequency signal.

[0026] In another aspect, the present invention further provides a lithium-ion battery device, comprising:

[0027] A lithium-ion battery equipped with any one of the above safety warning devices.

[0028] The technical solution of the present invention can use a fan blade to capture the kinetic energy of the gas released from the vent hole at the moment when the gas generated by the lithium-ion battery breaks open the safety valve, and convert the kinetic energy into electrical energy through a generator. Then, the signal transmitter uses the electrical energy to send a radio frequency signal, so that the signal receiver receives the radio frequency signal and notifies the battery management system, so that the battery management system can promptly power off the lithium-ion battery to prevent the lithium-ion battery from further deteriorating. Because the safety warning device of the present invention can convert the kinetic energy of the gas released from the vent hole into electrical energy and send an alarm signal to the battery management system at the moment when the safety valve of the lithium-ion battery is opened, no complex data processing is required in this process, thereby improving the reliability of lithium-ion battery thermal runaway detection. In addition, the safety warning device of the present invention will only trigger an alarm when the safety valve of the lithium-ion battery is opened, and will not trigger an alarm if the safety valve is not opened, thereby preventing false alarms and achieving the purpose of improving the reliability of lithium-ion battery safety warning.

[0029] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0031] Figure 1 is a schematic structural diagram of a safety warning device for a lithium-ion battery according to one embodiment of the present invention;

[0032] Figure 2 is an exploded view of a safety warning device according to an embodiment of the present invention;

[0033] Figure 3 2 is a schematic structural diagram of an alarm signal generator in a safety warning device according to an embodiment of the present invention;

[0034] Figure 4 is a schematic structural diagram of a safety warning device for a lithium-ion battery according to another embodiment of the present invention;

[0035] Figure 5 is an exploded view of a safety warning device according to another embodiment of the present invention;

[0036] Figure 6 is a schematic structural diagram of a safety warning device for a lithium-ion battery according to yet another embodiment of the present invention;

[0037] Figure 7 is an exploded view of a safety warning device according to another embodiment of the present invention;

[0038] Figure 8 is a schematic circuit structure diagram of a signal receiving end in a safety warning device according to an embodiment of the present invention;

[0039] Figure 9 is a schematic circuit structure diagram of a signal receiving end in a safety warning device according to an embodiment of the present invention;

[0040] Figure 10 FIG. 4 is a graph showing voltage and charging current during a charging experiment according to an embodiment of the present invention. DETAILED DESCRIPTION

[0041] Refer to the following Figures 1 to 10 To describe a lithium-ion battery device and a safety warning device of an embodiment of the present invention. In the description of this embodiment, it should be understood that the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "multiple" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0042] An embodiment of the present invention provides a safety warning device for a lithium-ion battery. The safety warning device is used to be assembled on a lithium-ion battery and can send an alarm signal the moment a safety valve of the lithium-ion battery opens, thereby achieving the purpose of improving the safety of the lithium-ion battery.

[0043] In this embodiment, the structure of the safety warning device is as follows: Figure 1 and Figure 2 As shown, the device comprises a bracket 10 and an alarm signal generator, wherein the bracket 10 is used to be assembled on a lithium-ion battery 20, wherein the top of the lithium-ion battery 20 is provided with a positive electrode tab 231 and a negative electrode tab 232, and a vent hole 21 is provided between the positive electrode tab 231 and the negative electrode tab 232, and a safety valve 22 is installed at the vent hole 21. Under normal circumstances, the safety valve 22 is in a closed state to seal the lithium-ion battery 20; after a side reaction occurs in the lithium-ion battery 20 and combustible gas is generated, the internal pressure of the lithium-ion battery 20 will increase. When the internal pressure increases to a certain level, the safety valve 22 will be opened and the pressure will be released from the vent hole 21 to prevent the lithium-ion battery 20 from exploding, thereby improving the safety of the lithium-ion battery 20.

[0044] In this embodiment, the bracket 10 is provided with a motor mounting slot 13, within which a generator 15 (a DC generator) is mounted. A rotating shaft 151 is provided on the generator 15, and a fan blade 14 is mounted on the rotating shaft 151. After the safety warning device is assembled on the lithium-ion battery 20 through the bracket 10, the fan blade 14 is positioned corresponding to the air vent 21. When the safety valve 22 opens, it captures the airflow released by the air vent 21 and drives the generator 15 via the rotating shaft 151 to generate electricity.

[0045] The structure of the alarm signal generator of this embodiment is as follows Figure 3 As shown, the device comprises a signal transmitting terminal 51 and a signal receiving terminal 52. The signal transmitting terminal 51 includes a first processor 501 and a wireless signal transmitter 511. The power supply terminal of the first processor 501 and the power supply terminal of the wireless signal transmitter 511 are both electrically connected to the output terminal of the generator 15. The power generated by the generator 15 can power the first processor 501 and the wireless signal transmitter 511. A voltage-stabilizing capacitor C0 is provided at the output terminal of the generator 15 to stabilize the voltage output by the output terminal of the generator 15. The first processor 501 is connected to the wireless signal transmitter 511 and is configured to control the wireless signal transmitter 511 to emit a radio frequency signal after receiving power.

[0046] The signal receiving end 52 includes a DC power supply 521, a second processor 502, a wireless signal receiver 512, and a communication unit 522. The communication unit 522 can adopt an RS485 communication unit. The DC power supply 521 is connected to the power supply end of the second processor 502, the wireless signal receiver 512, and the communication unit 522 to provide power to the second processor 502, the wireless signal receiver 512, and the communication unit 522. The wireless signal receiver 512 is wirelessly connected to the wireless signal transmitter 511 and can receive the radio frequency signal emitted by the wireless signal transmitter 511; the second processor 502 is connected to the wireless signal receiver 512 and the communication unit 522, and can receive the radio frequency signal emitted by the wireless signal transmitter 511 through the wireless signal receiver 512, and exchange information with the battery management system through the communication unit 522.

[0047] In this embodiment, both the first processor 501 and the second processor 502 can utilize a CPLD chip, which is a digital integrated circuit based on programmable logic technology and widely used in the design and implementation of digital systems. The wireless signal transmitter 511 can utilize a wireless signal transmitting device capable of operating in the 433 MHz frequency band, and accordingly, the wireless signal receiver 512 can utilize a wireless signal receiving device capable of receiving transmitted signals in the 433 MHz frequency band.

[0048] In this embodiment, the working principle of the safety warning device is:

[0049] If the lithium-ion battery 20 is subjected to abuse and a side reaction occurs internally, and the gas generated by the side reaction causes excessive pressure inside the battery, the gas may break open the safety valve 22 and be released from the vent hole 21. At the moment the safety valve 22 opens, the gas released from the vent hole 21 will impact the fan blade 14, driving the fan blade 14 to start rotating.

[0050] After the fan blades 14 rotate, the rotor of the generator 15 can be driven to rotate via the rotating shaft 151, so that the generator 15 generates electricity. The electric energy generated by the generator 15 is input to the power supply terminal of the first processor 501 and the wireless signal transmitter 511 to power the first processor 501 and the wireless signal transmitter 511. After the first processor 501 receives power, it controls the wireless signal transmitter 511 to emit a radio frequency signal.

[0051] The second processor 502 receives the radio frequency signal sent by the wireless signal transmitter 511 through the wireless signal receiver 512, and after receiving the radio frequency signal, sends an alarm signal to the battery management system of the lithium-ion battery 20 through the communication unit 522 to notify the battery management system that the safety valve 22 of the lithium-ion battery 20 has been opened;

[0052] After receiving the alarm signal from the communication unit 522 , the battery management system immediately disconnects the lithium-ion battery 20 from the charging power source to stop charging the lithium-ion battery 20 .

[0053] In this embodiment, after the safety valve 22 is opened, although the lithium-ion battery 20 can no longer meet normal operation and has a greater safety risk, thermal runaway has not occurred and the battery state is still relatively stable, which will not cause a chain reaction in the surrounding lithium-ion batteries; therefore, the battery management system controls the charging of the lithium-ion battery 20 to stop to prevent the battery state of the lithium-ion battery 20 from further deteriorating and improve the safety of the lithium-ion battery 20.

[0054] As can be seen from the above, this embodiment can use a fan blade to capture the kinetic energy of the gas released from the vent hole at the moment the gas generated by the lithium-ion battery breaks open the safety valve, and convert this kinetic energy into electrical energy through a generator. Then, the signal transmitter sends a radio frequency signal based on the electrical energy, so that the signal receiver receives the radio frequency signal and notifies the battery management system, so that the battery management system can promptly disconnect the lithium-ion battery and prevent further deterioration of the battery state of the lithium-ion battery. Because the safety warning device of this embodiment can convert the kinetic energy of the gas released from the vent hole into electrical energy and send an alarm signal to the battery management system at the moment the safety valve of the lithium-ion battery opens, this process does not require complex data processing, thereby improving the reliability of lithium-ion battery thermal runaway detection. Moreover, the safety warning device of this embodiment only triggers an alarm when the safety valve of the lithium-ion battery is open, and does not trigger an alarm if the safety valve is not open, thereby preventing false alarms and achieving the purpose of improving the reliability of lithium-ion battery safety warning.

[0055] In some embodiments of the present invention, Figure 2 As shown, the motor installation slot 13 is provided with a sealing cover plate 131 , and the sealing cover plate 131 is used to seal the generator 15 in the motor installation slot 13 to protect the generator 15 .

[0056] In this embodiment, a sealing cover plate 131 is used to seal the generator 15 in the motor mounting groove 13. After the safety valve 22 is flushed, the gas or electrolyte generated by the lithium-ion battery 20 can be prevented from entering the generator 15 and affecting the normal operation of the generator 15, thereby achieving the purpose of improving the safety of the generator 15.

[0057] In some embodiments of the present invention, a wiring slot 132 is provided on the sealing cover plate 131 , and a wire connected to the output end of the generator 15 is led out of the motor mounting slot from the wiring slot 132 to improve the convenience of wiring the generator 15 .

[0058] In some embodiments of the present invention, the structure of the bracket 10 in the safety warning device is as follows: Figure 1 and 2 As shown, the device includes a support plate 101, a first support arm 102, and a second support arm 103. The support plate 101, the first support arm 102, and the second support arm 103 can be integrally formed. The first end of the first support arm 102 and the first end of the second support arm 103 are respectively connected to the first and second ends of the lengthwise direction of the support plate 101. The second end of the first support arm 102 and the second end of the second support arm 103 are used to connect to the lithium-ion battery 20, so that the safety warning device can be assembled on the lithium-ion battery 20.

[0059] In this embodiment, the motor mounting slot 13 is provided on the support cross plate 101. After the safety warning device is assembled on the lithium-ion battery 20, the support cross plate 101 is positioned above the top of the lithium-ion battery 20. The fan blade 14 is suspended above the air vent 21. If the safety valve 22 is circular, the distance between the fan blade and the top of the lithium-ion battery 20 is greater than the diameter of the safety valve 22; if the safety valve 22 is elliptical, the distance between the fan blade and the top of the lithium-ion battery 20 is greater than the length of the minor axis of the safety valve 22.

[0060] In this embodiment, after the safety warning device is assembled onto the lithium-ion battery 20 via the bracket 10, the position of the fan blades 14 is ensured to correspond to the position of the vent hole 21. Manual positioning of the fan blades 14 is not required during installation, thereby improving assembly convenience. Furthermore, in this embodiment, the fan blades 14 are hoisted above the vent hole 21. This not only fully utilizes the kinetic energy of the airflow released when the safety valve 22 opens to generate electricity, but also prevents the fan blades 14 from being too close to the safety valve 22, which could affect the opening of the safety valve 22, thereby further improving the safety of the lithium-ion battery 20.

[0061] Furthermore, in some embodiments of the present invention, a first mounting sleeve 112 is provided at the second end of the first support arm 102, and a second mounting sleeve 113 is provided at the second end of the second support arm 103. The first mounting sleeve 112 and the second mounting sleeve 113 can be assembled on the lithium-ion battery 20 in a sleeve-type manner. The first mounting sleeve 112 and the second mounting sleeve 113 can also form a clamping structure, thereby improving the reliability of the assembly of the bracket 10 on the lithium-ion battery 20.

[0062] In this embodiment, when assembling the safety warning device onto the lithium-ion battery 20, only the first mounting sleeve 112 and the second mounting sleeve 113 need to be attached to either side of the lithium-ion battery 10, thereby facilitating assembly of the safety warning device. Furthermore, once the safety warning device is assembled onto the lithium-ion battery 20, the position of the fan blades 14 aligns with the position of the air vents 21, ensuring the reliability of the safety warning for the lithium-ion battery 20.

[0063] Furthermore, in some embodiments of the present invention, electrode connection holes are provided on the supporting horizontal plate 101 , and the electrode connection holes are used to facilitate the connection of the battery tabs of the lithium-ion battery 20 .

[0064] In this embodiment, the electrode wiring holes of the supporting horizontal plate 101 include a positive wiring hole 121 and a negative wiring hole 122, wherein the positive wiring hole 121 corresponds to the position of the positive electrode tab 231 of the lithium-ion battery 20, and the negative wiring hole 122 corresponds to the position of the negative electrode tab 232 of the lithium-ion battery 20.

[0065] The positive electrode tab 231 and the negative electrode tab 232 of the lithium-ion battery 20 are both provided with fixing screws. The fixing screw of the positive electrode tab 231 is used to fix the positive electrode connection of the lithium-ion battery 20, and the fixing screw of the negative electrode tab 232 is used to fix the negative electrode connection of the lithium-ion battery 20. The user can insert a screwdriver through the positive electrode connection hole 121 to tighten the fixing screw on the positive electrode tab 231, and insert a screwdriver through the negative electrode connection hole 122 to tighten the fixing screw on the negative electrode tab 232.

[0066] In this embodiment, electrode connection holes are provided on the supporting horizontal plate 101 to facilitate connection of the battery tabs of the lithium-ion battery 20 , thereby improving the convenience of connection operation of the lithium-ion battery 20 .

[0067] In other embodiments of the present invention, the structure of the bracket 10 is as follows: Figure 4 and Figure 5 As shown, it includes a third mounting sleeve 301, a fourth mounting sleeve 302, a connecting transverse plate 303 and a mounting column 24, and the third mounting sleeve 301, the fourth mounting sleeve 302, the connecting transverse plate 303 and the mounting column 24 can be integrally formed. The third mounting sleeve 301 and the fourth mounting sleeve 302 are respectively arranged at the first end and the second end in the length direction of the connecting transverse plate 303. The third mounting sleeve 301 and the fourth mounting sleeve 302 are used to be mounted on the two ends of the top of the lithium-ion battery 20 to assemble the battery safety warning device on the lithium-ion battery 20.

[0068] The bottom of the mounting column 24 is mounted on the connecting horizontal plate 303. The motor mounting slot 13 is located on the top of the mounting column 24. The motor mounting slot 13 is provided with a wiring slot 132. The generator 15 is mounted in the motor mounting slot 13. The sealing cover 131 is used to seal the generator 15 inside the motor mounting slot 13 to prevent gas or electrolyte generated by the lithium-ion battery 20 from entering the generator 15.

[0069] In this embodiment, the fan blades 14 are mounted on the rotating shaft 151 of the generator 15, and the blades of the fan blades 14 are cups. After the battery safety warning device is assembled to the lithium-ion battery 20 via the third mounting sleeve 301 and the fourth mounting sleeve 302, the fan blades 14 are installed vertically in a position corresponding to the vent hole 21. When the safety valve 22 opens, the fan blades 14 can move under the exhaust pressure of the gas released from the vent hole 21. Furthermore, in this embodiment, the distance between the fan blades 14 and the top of the lithium-ion battery 20 is greater than the diameter of the safety valve 22 to prevent it from affecting the opening of the safety valve 22.

[0070] In this embodiment, when assembling the safety warning device onto the lithium-ion battery 20, only the third mounting sleeve 301 and the fourth mounting sleeve 302 need to be attached to either side of the lithium-ion battery 20, thereby improving the convenience of safety warning device assembly. Furthermore, the use of wind cups in the blades of the impeller 12 can better capture the kinetic energy of the airflow ejected at the moment the safety valve 22 opens, thereby improving the sensitivity and reliability of deflation detection for the lithium-ion battery 20 and ensuring the reliability of safety warnings for the lithium-ion battery 20.

[0071] In some embodiments of the present invention, the structure of the safety warning device is as follows: Figure 6 and Figure 7 As shown, the bracket 10 includes a frame 41, a motor mounting slot 13 disposed on a top plate 412 of the frame 41, a generator 15 mounted in the motor mounting slot 13, and a sealing cover 131 used to seal the generator 15 in the motor mounting slot 13 to protect it. A wiring slot 132 is disposed on the sealing cover 131, through which wires connected to the output end of the generator 15 are led out of the motor mounting slot 13. A through hole 413 is disposed on the bottom plate 411 of the frame 41, and the position of the through hole 413 corresponds to the position of the motor mounting slot 13 on the top plate 412.

[0072] In this embodiment, a first clamping plate 421 and a second clamping plate 422 are provided at the bottom of the frame 41. These first clamping plates 421 and second clamping plates 422 form a clamping structure 42, which is used to be clamped onto the lithium-ion battery 20, thereby assembling the safety warning device on the lithium-ion battery 20 and locating it between the positive electrode tab 231 and the negative electrode tab 232. After the safety warning device is assembled on the lithium-ion battery 20, the position of the through hole 413 corresponds to the position of the air vent 21 of the lithium-ion battery 20, thereby allowing the fan blade 14 to be suspended at the position corresponding to the air vent 21. In addition, if the safety valve 22 is elliptical, the distance between the fan blade 14 and the top of the lithium-ion battery 20 is greater than the minor axis length of the safety valve 22.

[0073] In this embodiment, the bracket 10 of the safety warning device adopts a frame 41 provided with a clamping structure 42, which can reduce the volume of the safety warning device and improve the convenience of assembling the safety warning device.

[0074] In some embodiments of the present invention, Figure 8 As shown, the second processor 502 in the signal receiving end 52 is also connected to an alarm 523 , which can be an audible and visual alarm and includes a DC power supply 521 connected to a power supply end of the alarm 523 to supply power to the alarm 523 .

[0075] In this embodiment, the circuit between the second processor 502 and the alarm 523 is as follows: Figure 9 As shown, the second processor 502 is connected to the base of the transistor Q0, the collector of the transistor Q0 is connected to the DC power supply 521 through the current limiting resistor R0, the emitter is connected to one end of the coil part of the relay K0, and the other end of the coil part of the relay K0 is grounded; the positive pole of the power supply end of the alarm 523 is connected to the DC power supply 521 through the current limiting resistor R0, the negative pole is grounded, and the contact part of the relay K0 is arranged on the line where the positive pole of the power supply end of the alarm 523 is connected to the current limiting resistor R0.

[0076] After the second processor 502 receives the radio frequency signal sent by the wireless signal transmitter 511 through the wireless signal receiver 512, it can control the transistor Q1 to turn on; after the transistor Q0 is triggered to turn on, the coil part of the relay K0 is energized; after the coil part of the relay K0 is energized, the contact part is closed, and after the contact part of the relay K0 is closed, the alarm 523 is energized and sends an alarm signal to remind the user to take safety measures in time to prevent the condition of the lithium-ion battery 20 from further deteriorating.

[0077] In this embodiment, an alarm 523 is provided in the safety warning device to provide a safety warning to the user, which can further improve the safety of the lithium-ion battery 20 .

[0078] In some embodiments of the present invention, the lithium-ion battery device of the present invention includes a lithium-ion battery and a safety warning device mounted on the lithium-ion battery. The safety warning device can be the safety warning device of any of the above embodiments. Since the safety warning device of the lithium-ion battery has been described in detail above, to avoid redundancy, it is not further described in this embodiment.

[0079] Experimental example:

[0080] This experimental example Figure 1 After the safety warning device in the test is assembled on the lithium-ion battery, the lithium-ion battery is charged with a current of 1C and overcharged until the safety valve of the lithium-ion battery opens to release pressure, so as to check whether the safety warning device can send out an alarm signal and stop charging the battery.

[0081] In this experimental example, during the charging experiment of the lithium-ion battery, the changing curves of the voltage and charging current of the lithium-ion battery are as follows: Figure 10 As shown in the figure, when the charging process reaches 818 seconds, the safety valve of the lithium-ion battery opens; the alarm in the safety warning device sends an alarm signal within 1 second after the safety valve opens, and the electrical connection between the lithium-ion battery and the charging power supply is disconnected, the charging current drops to 0, the charging voltage of the lithium-ion battery drops instantaneously, and the surface temperature of the lithium-ion battery rises slightly due to delay and then gradually decreases.

[0082] Through this experiment, it can be seen that the technical solution of the present invention can successfully warn the opening of the battery safety valve and can prevent the deterioration of the battery state very early, avoiding thermal runaway of the lithium-ion battery.

[0083] Other embodiments of the present disclosure will readily occur to those skilled in the art after considering the specification and practicing the present disclosure. This disclosure is intended to cover any variations, uses, or adaptations of the present disclosure that follow the general principles of the present disclosure and include common knowledge or customary techniques in the art not disclosed herein. The description and examples are to be considered as exemplary only, with the true scope and spirit of the present disclosure being indicated by the claims.

[0084] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. The scope of patent protection of the present invention shall be based on the claims. Some equivalent structural changes and modifications made by those skilled in the art using the contents of the description of the present invention should be included in the scope of protection of the present invention.

Claims

1. A safety warning device for lithium-ion batteries, characterized in that: include: a bracket, which is used to be assembled on the lithium-ion battery and is provided with a motor mounting slot; a generator, which is mounted in the motor mounting slot and is provided with a rotating shaft; a fan blade mounted on the rotating shaft and configured to be mounted at a position corresponding to the pressure relief hole of the lithium-ion battery, so as to rotate under the action of the exhaust pressure of the pressure relief hole and drive the generator to generate electrical energy through the rotating shaft; a signal transmitter, whose power supply end is electrically connected to the output end of the generator and is configured to emit a radio frequency signal while generating electrical energy using the generator; The signal receiving end includes a communication unit and is wirelessly connected to the signal transmitting end. The signal receiving end is configured to send an alarm signal to the battery management system through the communication unit after receiving the radio frequency signal.

2. The safety warning device according to claim 1, characterized in that: The motor installation slot is further provided with a sealing cover plate, and the sealing cover plate is used to seal the generator inside the motor installation slot.

3. The safety warning device according to claim 2, characterized in that: The sealing cover plate is provided with a wiring groove, and the wire connected to the output end of the generator is led out of the motor installation groove through the wiring groove.

4. The safety warning device according to claim 1, characterized in that: The bracket includes a first support arm, a second support arm and a support cross plate, wherein: The first support arm and the second support arm are respectively provided at both ends of the support cross plate in the length direction, and the first support arm and the second support arm are used to be connected to the lithium-ion battery so as to assemble the safety warning device to the lithium-ion battery; The supporting transverse plate is used for being assembled above the top of the lithium-ion battery, the motor mounting groove is provided on the supporting transverse plate, and the fan blade is used for being hoisted above the pressure relief hole.

5. The safety warning device according to claim 4, characterized in that: The first support arm is provided with a first mounting sleeve, the second support arm is provided with a second mounting sleeve, and the first mounting sleeve and the second mounting sleeve are used to be sleeved on the lithium-ion battery to assemble the safety warning device on the lithium-ion battery.

6. The safety warning device according to claim 4, characterized in that: The supporting horizontal plate is provided with an electrode wiring hole, and the electrode wiring hole is used to provide operation convenience for wiring the battery tabs of the lithium-ion battery.

7. The safety warning device according to claim 1, characterized in that: The bracket includes a third mounting sleeve, a fourth mounting sleeve, a connecting horizontal plate and a mounting column, wherein: The third mounting sleeve and the fourth mounting sleeve are respectively provided at both ends of the connecting transverse plate in the length direction, and the third mounting sleeve and the fourth mounting sleeve are used to be sleeved on the lithium-ion battery to assemble the safety warning device on the lithium-ion battery; The connecting horizontal plate is used to be assembled on one side of the lithium-ion battery, the bottom of the mounting column is set on the connecting horizontal plate, the motor mounting slot is set on the top of the mounting column, the blades of the fan blade adopt wind cups, and the fan blade is used to be installed vertically at a position corresponding to the air leakage hole.

8. The safety warning device according to claim 1, characterized in that: The bracket includes a frame and a clamping structure arranged at the bottom of the frame, wherein the bottom plate of the frame is provided with a through hole, and the motor mounting slot is provided on the top plate of the frame at a position corresponding to the through hole; The clamping structure is used to assemble the bracket on the lithium-ion battery and is located between the battery tabs of the lithium-ion battery, and the position of the through hole corresponds to the position of the air vent.

9. The safety warning device according to claim 1, characterized in that: The signal receiving end also includes a connection alarm, and the signal receiving end is further configured to control the alarm to send an alarm signal after receiving the radio frequency signal.

10. A lithium-ion battery device, characterized in that: include: A lithium-ion battery equipped with the safety warning device according to any one of claims 1 to 9.

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