Seawater soaking test device for lithium battery

Abstract

The utility model discloses a lithium battery seawater soaking test device, which comprises a water tank and a sample holder for placing a lithium battery sample, the middle of the water tank is divided into an upper soaking cavity and a lower motor cavity by a partition plate, the sample holder is slidably connected in the upper soaking cavity along the vertical direction, an impeller is mounted on the partition plate below the sample holder, and the impeller is connected with the water tank. A rotating motor for driving the impeller to rotate is arranged on the lower motor cavity; an electric undercarriage for controlling the sample rack to ascend and descend in the upper soaking cavity is mounted outside the water tank, a control system for monitoring the sample state is further mounted outside the water tank, the control system is electrically connected with the electric undercarriage, and a timer is arranged in the control system. According to the utility model, the control system is used for collecting voltage and temperature data in real time, reliable data support is provided, basis is provided for optimization design and improvement of the lithium battery, meanwhile, testers are conveniently reminded, and the thermal runaway range is prevented from being expanded; automatic timing, automatic stopping and standardized testing are achieved, and data are more accurate.

Description

Technical Field

[0001] The utility model belongs to the technical field of lithium ion battery safety testing, and in particular relates to a lithium battery seawater immersion testing device. Background Art

[0002] With the rapid development of the new energy industry, lithium batteries have been widely used as a high-performance battery. However, in some special environments, such as seawater, the performance of lithium batteries may be seriously affected or even damaged. Therefore, in order to ensure the safety performance of lithium batteries, it is necessary to conduct simulated seawater immersion tests on lithium batteries during the research and development and production process. The main standard reference is "GB-T31485-2015 6.2.9 Seawater Immersion Test".

[0003] At present, most of the methods in the industry are to place lithium battery samples in a self-made pool, add 3.5% NaCl solution, and simulate the composition of seawater at room temperature for testing. The disadvantages are as follows:

[0004] 1. The homemade water pool cannot monitor the sample status;

[0005] 2. The test lasts 2 hours. If the tester is not on site, thermal runaway may occur during the test and timely warning cannot be given;

[0006] 3. The test duration is manually timed and there is a possibility that the test duration may exceed the standard requirements.

[0007] In summary, it is necessary to improve and solve the various problems existing in the current lithium-ion battery safety testing technology. Utility Model Content

[0008] The utility model aims to provide a lithium battery seawater immersion test device to solve at least one of the above problems existing in the prior art.

[0009] In order to achieve the above purpose, the utility model adopts the following technical solutions:

[0010] A lithium battery seawater immersion test device comprises a water tank and a sample rack for placing lithium battery samples, the middle of the water tank is divided into an upper immersion chamber and a lower motor chamber by a partition plate, the sample rack is slidably connected in the upper immersion chamber along the vertical direction, a pulse wheel is installed on the partition plate below the sample rack, and a rotating motor for driving the pulse wheel to rotate is arranged on the lower motor chamber; an electric landing gear for controlling the sample rack to rise and fall in the upper immersion chamber is installed outside the water tank, and a control system for monitoring the state of the sample is also installed outside the water tank, the control system is electrically connected to the electric landing gear, and a timer is arranged in the control system.

[0011] As a preferred technical solution in the utility model, the electric landing gear includes a lifting motor, a height positioning frame and a horizontal support frame, and the lifting motor is electrically connected to the control system; the horizontal support frame is arranged above the water tank, one end of the horizontal support frame is connected to the water tank through the height positioning frame, the lifting motor is installed on the outer wall on the back of the water tank, and a winding wheel is installed on the motor shaft of the lifting motor, and a rope for driving the sample rack to lift and lower is wound on the winding wheel.

[0012] As a preferred technical solution in the utility model, the electric landing gear also includes a first guide wheel and a second guide wheel, and the first guide wheel and the second guide wheel are both installed at the lower end of the horizontal support frame, the first guide wheel is located directly above the winding wheel, and the second guide wheel is located directly above the middle of the sample rack. The end of the rope away from the winding wheel successively passes around the first guide wheel and the second guide wheel and is divided into multiple thin wires connected to the four sides of the sample rack.

[0013] As a preferred technical solution in the utility model, vertical tracks are arranged on the inner walls of the water tank on both sides of the upper immersion chamber, and sliding blocks are arranged on both sides of the sample rack, each sliding on the corresponding vertical track.

[0014] As a preferred technical solution in the utility model, a water inlet pipe connected to the upper part of the upper soaking chamber and a water outlet pipe connected to the lower part of the upper soaking chamber are respectively arranged on one side of the water tank.

[0015] As a preferred technical solution in the utility model, a water inlet valve electrically connected to the control system is installed on the water inlet pipe, and a water level switch for monitoring the water inlet amount is installed in the water inlet valve.

[0016] As a preferred technical solution in the utility model, a sound and light alarm device is installed outside the water tank, and the sound and light alarm device is electrically connected to the control system.

[0017] As a preferred technical solution in the utility model, a universal wheel is installed at the lower end of the water tank.

[0018] As a preferred technical solution in the utility model, the water tank and the sample rack are both made of 304 stainless steel.

[0019] Beneficial effects: Before the utility model works, the equipment is first moved to the designated position, a water source is connected to the upper immersion chamber, 3.5% NaCl is manually calculated according to the water consumption and added to the upper immersion chamber, and then the rotary motor is turned on to control the rotation of the impeller, thereby stirring the solution with the added NaCl evenly; the electric landing gear controls the sample rack to descend, so that the lithium battery sample on the sample rack is submerged, the timer switch starts timing, and the test officially begins. During the test, the control system monitors the voltage and temperature of the lithium battery sample in real time. During the test, if the lithium battery sample itself generates heat to a limited value, the control system will remind the tester that the test is abnormal; when the timer completes the timing, the electric landing gear controls the sample rack to rise, the test ends, and the control system exports the real-time monitoring data of voltage and temperature.

[0020] The utility model utilizes the control system to collect voltage and temperature data in real time, provides reliable data support, provides a basis for the optimal design and improvement of lithium batteries, and conveniently reminds testers to avoid the expansion of thermal runaway range; automatic timing, automatic stop, standardized testing, and more accurate data. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a three-dimensional schematic diagram of the utility model;

[0022] Figure 2 It is a side view of the utility model;

[0023] Figure 3 It is a cross-sectional view of the utility model.

[0024] In the figure: 1-water tank; 101-partition plate; 102-vertical track; 103-water inlet pipe; 104-water outlet pipe; 105-universal wheel; 2-sample rack; 3-pulsator; 4-rotating motor; 5-control system; 6-lifting motor; 7-height positioning frame; 8-horizontal support frame; 9-rope; 10-first guide wheel; 11-second guide wheel; 12-sound and light alarm device. DETAILED DESCRIPTION

[0025] In order to more clearly illustrate the technical solutions in the embodiments of the utility model or the prior art, the utility model will be briefly introduced below in combination with the drawings and the description of the embodiments or the prior art. Obviously, the following description of the structure of the drawings is only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work. It should be noted that the description of these embodiments is used to help understand the utility model, but does not constitute a limitation of the utility model.

[0026] Example:

[0027] like Figure 1-Figure 3As shown, the present embodiment provides a lithium battery seawater immersion test device, comprising a water tank 1 and a sample rack 2 for placing lithium battery samples. The middle part of the water tank 1 is divided into an upper immersion chamber and a lower motor chamber by a partition plate 101. The upper immersion chamber is used to access a water source without affecting the lower motor chamber. The sample rack 2 is slidably connected to the upper immersion chamber in a vertical direction, so that the lithium battery sample is placed after the sample rack 2 rises, and then the sample rack 2 is lowered to a certain depth for testing. A pulsator 3 is installed on the partition plate 101 below the sample rack 2, and a rotating motor 4 for driving the pulsator 3 to rotate is provided on the lower motor chamber. Turning on the rotating motor 4 can control the rotation of the pulsator 3, thereby stirring the solution added with NaCl evenly; an electric landing gear for controlling the sample rack 2 to rise and fall in the upper immersion chamber is installed outside the water tank 1, and a control system 5 for monitoring the state of the sample is also installed outside the water tank 1. The control system 5 is electrically connected to the electric landing gear, and a timer is provided in the control system for timing, so as to realize automatic control of the rising time of the sample rack 2 and accurately control the test duration.

[0028] Before the utility model works, the equipment is first moved to the designated position, a water source is connected to the upper immersion chamber, 3.5% NaCl is manually calculated according to the water consumption and added to the upper immersion chamber, and then the rotary motor 4 is turned on to control the rotation of the impeller 3, thereby stirring the solution with the added NaCl evenly; the electric landing gear controls the sample rack 2 to descend, so that the lithium battery sample on the sample rack 2 is submerged, the timer switch starts timing, and the test officially begins. During the test, the control system monitors the voltage and temperature of the lithium battery sample in real time. During the test, if the lithium battery sample itself generates heat to a limited value, the control system 5 will remind the tester that the test is abnormal; after the timer completes the timing, the electric landing gear controls the sample rack 2 to rise, the test ends, and the control system 5 exports the real-time monitoring data of the voltage and temperature.

[0029] The utility model utilizes the control system 5 to collect voltage and temperature data in real time, provides reliable data support, provides a basis for the optimal design and improvement of lithium batteries, and conveniently reminds test personnel to avoid the expansion of thermal runaway range; automatic timing, automatic stop, standardized testing, and more accurate data.

[0030] It should be noted that the control system 5 adopts PLC control mode. As an auxiliary control function of the PLC set parameters, it can realize lifting control, soaking time setting, voltage, temperature real-time monitoring and save data, and feedback abnormal data to the sound and light alarm.

[0031] As a preferred implementation scheme in this embodiment, it needs to be further explained that the electric landing gear includes a lifting motor 6, a height positioning frame 7 and a horizontal support frame 8. The lifting motor 6 is electrically connected to the control system 5 to facilitate the control of the start and stop of the lifting motor 6; the horizontal support frame 8 is arranged above the water tank 1, and one end of the horizontal support frame 8 is connected to the water tank 1 through the height positioning frame 7 to ensure the stability of the horizontal support frame 8. The lifting motor 6 is installed on the outer wall on the back of the water tank 1, and a winding wheel is installed on the motor shaft of the lifting motor 6. The winding wheel is wound with a rope 9 that drives the sample rack 2 to rise and fall, ensuring that the lifting motor 6 can control the lifting and falling of the sample rack 2 during operation.

[0032] As a preferred implementation scheme in this embodiment, it needs to be further explained that the electric landing gear also includes a first guide wheel 10 and a second guide wheel 11. The first guide wheel 10 and the second guide wheel 11 are both installed at the lower end of the horizontal support frame 8. The first guide wheel 10 is located directly above the winding wheel, and the second guide wheel 11 is located directly above the middle of the sample rack 2. The end of the rope 9 away from the winding wheel successively bypasses the first guide wheel 10 and the second guide wheel 11 and is divided into multiple strands of thin wires connected to the four sides of the sample rack 2, thereby ensuring the stability of the rope 9 when sliding, and also ensuring that the rope 9 can stably drive the sample rack 2 to rise and fall, thereby ensuring that the lifting motor 6 can stably and smoothly control the lifting and falling of the sample rack 2.

[0033] As a preferred implementation scheme in this embodiment, it needs to be further explained that vertical rails 102 are provided on the inner walls of the water tank 1 on both sides of the upper immersion chamber, and sliders are provided on both sides of the sample rack 2, each sliding on the corresponding vertical rails 102, to ensure the stability of the sample rack 2 when it is raised or lowered.

[0034] As a preferred implementation scheme in this embodiment, it needs to be further explained that one side of the water tank 1 is respectively provided with a water inlet pipe 103 connected to the upper part of the upper soaking chamber and a water outlet pipe 104 connected to the lower part of the upper soaking chamber, which is convenient for directly connecting the water pipe, making the water inlet and outlet smoother and improving convenience.

[0035] As a preferred implementation scheme in this embodiment, it needs to be further explained that a water inlet valve electrically connected to the control system 5 is installed on the water inlet pipe 103, a water level switch for monitoring the water inlet amount is installed in the water inlet valve, the water level switch is installed to monitor the water inlet amount, and the water inlet valve is installed to automatically stop adding water according to the water level setting.

[0036] As a preferred implementation scheme in this embodiment, it needs to be further explained that a sound and light alarm device 12 is installed outside the water tank 1, and the sound and light alarm device 12 is electrically connected to the control system 5, so as to more effectively remind the tester when the lithium battery sample is in an abnormal state.

[0037] As a preferred implementation scheme in this embodiment, it needs to be further explained that a universal wheel 105 is installed at the lower end of the water tank 1 to facilitate the movement of the lithium battery seawater immersion test device and flexibly change the test site.

[0038] As a preferred implementation scheme in this embodiment, it needs to be further explained that the water tank 1 and the sample rack 2 are both made of 304 stainless steel, which is rust-resistant and corrosion-resistant, ensuring the service life of the equipment.

[0039] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A lithium battery seawater immersion test device, characterized in that: The invention comprises a water tank (1) and a sample rack (2) for placing lithium battery samples. The middle of the water tank (1) is divided into an upper immersion chamber and a lower motor chamber by a partition plate (101). The sample rack (2) is slidably connected to the upper immersion chamber in a vertical direction. A pulsator (3) is installed on the partition plate (101) below the sample rack (2). A rotating motor (4) for driving the pulsator (3) to rotate is provided on the lower motor chamber. An electric landing gear for controlling the sample rack (2) to rise and fall in the upper immersion chamber is installed outside the water tank (1). A control system (5) for monitoring the state of the sample is also installed outside the water tank (1). The control system (5) is electrically connected to the electric landing gear, and a timer is provided in the control system.

2. A lithium battery seawater immersion test device according to claim 1, characterized in that: The electric landing gear comprises a lifting motor (6), a height positioning frame (7) and a horizontal support frame (8); the lifting motor (6) is electrically connected to the control system (5); the horizontal support frame (8) is arranged above the water tank (1); one end of the horizontal support frame (8) is connected to the water tank (1) through the height positioning frame (7); the lifting motor (6) is installed on the outer wall of the back side of the water tank (1); a winding wheel is installed on the motor shaft of the lifting motor (6), and a rope (9) is wound on the winding wheel to drive the sample rack (2) to rise and fall.

3. A lithium battery seawater immersion test device according to claim 2, characterized in that: The electric landing gear also includes a first guide wheel (10) and a second guide wheel (11), both of which are mounted on the lower end of the horizontal support frame (8), the first guide wheel (10) being located directly above the winding wheel, and the second guide wheel (11) being located directly above the middle of the sample rack (2), and the end of the rope (9) away from the winding wheel passes around the first guide wheel (10) and the second guide wheel (11) in turn, and then is divided into multiple thin wires connected to the four sides of the sample rack (2).

4. A lithium battery seawater immersion test device according to claim 1, characterized in that: Vertical tracks (102) are arranged on the inner walls of the water tank (1) on both sides of the upper soaking chamber, and sliding blocks are arranged on both sides of the sample rack (2) and slide on the corresponding vertical tracks (102).

5. The lithium battery seawater immersion test device according to claim 1, characterized in that: A water inlet pipe (103) communicating with the upper part of the upper soaking chamber and a water outlet pipe (104) communicating with the lower part of the upper soaking chamber are respectively arranged on one side of the water tank (1).

6. A lithium battery seawater immersion test device according to claim 5, characterized in that: The water inlet pipe (103) is provided with a water inlet valve electrically connected to the control system (5), and a water level switch for monitoring the amount of water inlet is provided in the water inlet valve.

7. A lithium battery seawater immersion test device according to claim 1, characterized in that: An audible and visual alarm device (12) is installed outside the water tank (1), and the audible and visual alarm device (12) is electrically connected to the control system (5).

8. The lithium battery seawater immersion test device according to claim 1, characterized in that: A universal wheel (105) is installed at the lower end of the water tank (1).

9. The lithium battery seawater immersion test device according to claim 1, characterized in that: The water tank (1) and the sample rack (2) are both made of 304 stainless steel.

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