Liquid inlet prevention device of battery cell explosion-proof valve

Abstract

The utility model provides a liquid inlet prevention device of a battery cell explosion-proof valve, which belongs to the technical field of battery cell explosion-proof valves, and comprises an outer protective sleeve, an inner protective sleeve, a rib plate and a positive pressure introduction mechanism, the outer protective sleeve and the inner protective sleeve are respectively in a shape with an opening on one side, the inner protective sleeve is positioned on the inner side of the outer protective sleeve, one end of the rib plate is connected with the inner surface of the outer protective sleeve, and the other end of the rib plate is connected with the positive pressure introduction mechanism. One end of the outer protective sleeve is connected with the outer surface of the inner protective sleeve, the other end of the outer protective sleeve is connected with the outer surface of the inner protective sleeve, a cavity is formed between the inner surface of the outer protective sleeve and the outer surface of the inner protective sleeve, the inner protective sleeve covers the anti-explosion valve patch, and the positive pressure introducing mechanism is connected to the cavity through the outer protective sleeve; the liquid inlet prevention device covers the explosion-proof valve patch of the battery cell, the inner protective sleeve completely wraps the explosion-proof valve patch, when the explosion-proof valve of the battery cell is cleaned, the brush is separated from the explosion-proof valve patch of the battery cell, the brush and the explosion-proof valve patch of the battery cell are prevented from being in direct contact, the explosion-proof valve patch is protected, the positive pressure mechanism is connected to the cavity, gas can be blown into the cavity to form positive pressure, and the explosion-proof valve patch of the battery cell is cleaned. Liquid is prevented from intruding into the anti-explosion valve, and the anti-explosion valve is prevented from being corroded due to water inflow during cleaning.

Description

Technical Field

[0001] This utility model relates to the field of battery cell explosion-proof valve technology, and in particular to a device for preventing liquid ingress into a battery cell explosion-proof valve. Background Technology

[0002] The manufacturing process of lithium batteries is quite complex, and the quality of lithium batteries is of paramount importance. Among these, the cell explosion-proof valve is particularly crucial. The explosion-proof valve is designed to ensure that the battery can automatically burst and release pressure under extreme conditions such as short circuits, thus providing protection. Structurally, the explosion-proof valve has an outer layer of explosion-proof valve patch. The main function of the patch is to protect the explosion-proof valve, preventing it from being exposed to the air and corroding, which would compromise the explosion-proof strength of the valve.

[0003] Due to the numerous manufacturing processes involved in lithium batteries, dust, foreign matter, or electrolyte crystals on the aluminum casing of the battery cells can easily accumulate and form dirt. When multiple cells are assembled into a module, the cells are subjected to a pressure of approximately 140 kgf. Foreign matter can easily damage the aluminum casing, posing a safety risk. Therefore, after sealing, the battery cells need to be cleaned with pure water. During the cleaning process, the sealed cells first pass through a uniformly rotating brush (brush washing stage), with water continuously flowing over the brush surface to clean it. Then, they pass through a spraying stage, where a top spray sprays water onto the large surface and top of the cell to clean away foreign matter. Finally, the cells are dried to remove any remaining water. During the brush washing stage, because the explosion-proof valve patch is in direct contact with the brush, fluctuations in the brush position can easily cause the patch to lift. If a cell with a lifted explosion-proof valve patch passes through the spraying stage, water can easily enter the explosion-proof valve. Figure 1 As shown, the explosion-proof valve with water inlet has a high risk of corrosion after being left for a long time. Utility Model Content

[0004] The technical problem to be solved by this utility model is how to prevent liquid from entering the explosion-proof valve when cleaning the battery cell explosion-proof valve.

[0005] This utility model solves the above-mentioned technical problems through the following technical solution: a battery cell explosion-proof valve anti-liquid ingress device, including an outer protective sleeve, an inner protective sleeve, a rib plate, and a positive pressure mechanism. Both the outer and inner protective sleeves are open on one side. The inner protective sleeve is located inside the outer protective sleeve. One end of the rib plate is connected to the inner surface of the outer protective sleeve, and the other end is connected to the outer surface of the inner protective sleeve. There is a cavity between the inner surface of the outer protective sleeve and the outer surface of the inner protective sleeve. The inner protective sleeve covers the explosion-proof valve patch, and the positive pressure mechanism is connected to the cavity through the outer protective sleeve.

[0006] Beneficial effects: The liquid ingress prevention device of the battery cell explosion-proof valve covers the explosion-proof valve patch of the battery cell, and the inner protective sleeve completely wraps the explosion-proof valve patch. When cleaning the battery cell explosion-proof valve, the brush is separated from the battery cell explosion-proof valve patch to avoid direct contact between the two and protect the explosion-proof valve patch. The positive pressure mechanism is connected to the cavity through the outer protective sleeve and can blow gas into the cavity to form positive pressure, preventing liquid from entering the explosion-proof valve and avoiding corrosion caused by water ingress during cleaning.

[0007] Preferably, the outer protective sleeve has an opening that is connected to a positive pressure mechanism.

[0008] Preferably, the positive pressure mechanism is an air pump M2.

[0009] Preferably, the outer protective sleeve and the inner protective sleeve have the same shape as the explosion-proof valve patch, and the distance between the edge of the outer protective sleeve and the explosion-proof valve patch, and the distance between the edge of the inner protective sleeve and the explosion-proof valve patch are respectively set distances.

[0010] Preferably, the distance between the edge of the outer protective sleeve and the explosion-proof valve patch is 10mm, and the distance between the edge of the inner protective sleeve and the explosion-proof valve patch is 5mm.

[0011] Beneficial effects: By setting a certain gap between the inner protective sleeve and the explosion-proof valve patch, this utility model can better achieve the pressing of the patch and avoid the anti-liquid ingress device pressing down on the patch and damaging it.

[0012] Preferably, there are at least four ribs.

[0013] Preferably, the anti-liquid ingress device further includes a control circuit, which includes a main switch SA1, a switch SA2, a feed sensor SL1, a first contactor SL2, a discharge sensor SL3, a second contactor SL4, relays KM1, KM2, and KM3, a motor M1, and a motor M3. One end of the main switch SA1 is connected to three-phase power, and the other end is connected to one end of the normally closed contact SL2B of the first contactor SL2, one end of the normally closed contact SL3B of the discharge sensor SL3, and one end of the normally closed contact SL4B of the second contactor SL4. The other end of the normally closed contact SL2B is connected in series with the normally open contact SL1K of the feed sensor SL1 and then connected to one end of the normally open contact of the relay KM1. The other end of the normally open contact of the relay KM1 is connected to the motor M1. The other end of the normally closed contact SL3B is connected in series with the normally open contact SL2K of the first contactor SL2 and then connected to one end of the normally open contact of the relay KM2. The other end of the normally open contact of the relay KM2... One end is connected to the air pump M2. The other end of the normally closed contact SL4B is connected in series with the normally open contact SL3K of the discharge sensor SL3 and then connected to one end of the normally open contact of the relay KM3. The other end of the normally open contact of the relay KM3 is connected to the motor M3. The L1 terminal of the three-phase power supply is connected to one end of the normally closed contact SL2B, one end of the normally closed contact SL3B, and one end of the normally closed contact SL4B. The other end of the normally closed contact SL2B is connected in series with the normally open contact SL1K and then connected to one end of the coil of the relay KM1. The other end of the normally closed contact SL3B is connected in series with the normally open contact SL2K and then connected to one end of the coil of the relay KM2. The other end of the normally closed contact SL4B is connected in series with the normally open contact SL3K and then connected to one end of the coil of the relay KM3. The other end of the coils of the relay KM1, the relay KM2, and the relay KM3 are connected together and then connected to one end of the switch SA2. The other end of the switch SA2 is connected to the other end of the main switch SA1.

[0014] Beneficial effects: The control circuit structure of this utility model is simple and has an interlock function, which can achieve precise control over the anti-liquid ingress device during pressing, inflation, stopping inflation and retraction, and avoid damage to the explosion-proof valve patch or water ingress during the cleaning process of the battery cell.

[0015] Preferably, the feed sensor SL1 is located at the feed inlet of the cell cleaning logistics line, the discharge sensor SL3 is located at the discharge outlet of the cell cleaning logistics line, and the first contactor SL2 and the second contactor SL4 are both located in the vertical direction of the cell cleaning logistics line, with the height of the second contactor SL4 being greater than the height of the first contactor SL2.

[0016] Preferably, the feed sensor SL1 and the discharge sensor SL3 are both laser beam sensors, and the first contactor SL2 and the second contactor SL4 are both limit switches.

[0017] Preferably, there are multiple anti-liquid ingress devices, all located above the battery cell cleaning logistics line, and each anti-liquid ingress device protects one battery cell explosion-proof valve. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the water ingress state of the battery cell explosion-proof valve patch in the existing technology;

[0019] Figure 2 A front view of the battery cell explosion-proof valve anti-liquid ingress device provided for an embodiment of this utility model;

[0020] Figure 3 A top view of the battery cell explosion-proof valve anti-liquid ingress device provided for an embodiment of this utility model;

[0021] Figure 4 A side view of the battery cell explosion-proof valve anti-liquid ingress device provided for an embodiment of this utility model;

[0022] Figure 5 A schematic diagram of the battery cell explosion-proof valve anti-liquid ingress device cover provided for an embodiment of this utility model, showing the battery cell explosion-proof valve patch.

[0023] Figure 6 A schematic diagram of the battery cell explosion-proof valve liquid ingress prevention device provided in the embodiments of this utility model applied in a battery cell cleaning logistics line;

[0024] Figure 7 A circuit diagram of the control circuit in the battery cell explosion-proof valve anti-liquid ingress device provided for an embodiment of this utility model;

[0025] In the diagram: 10 outer protective sleeve, 11 opening, 20 inner protective sleeve, 30 rib plate, 40 cavity, 100 battery cell, 101 explosion-proof valve patch. Detailed Implementation

[0026] To make the objectives, technical solutions, and advantages of this utility model clearer, the technical solutions of this utility model are described clearly and completely below with reference to specific embodiments and accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of this utility model. All other embodiments obtained by those skilled in the art based on the embodiments of this utility model without creative effort are within the scope of protection of this utility model.

[0027] like Figure 2-4As shown, this embodiment provides a battery cell explosion-proof valve anti-liquid ingress device, including an outer protective sleeve 10, an inner protective sleeve 20, a rib plate 30, and a positive pressure mechanism. The outer protective sleeve 10 and the inner protective sleeve 20 are both bent into a shape with an opening on one side. The inner protective sleeve 20 is located inside the outer protective sleeve 10. One end of the rib plate 30 is connected to the inner surface of the outer protective sleeve 10, and the other end is connected to the outer surface of the inner protective sleeve 20. There is a cavity 40 between the inner surface of the outer protective sleeve 10 and the outer surface of the inner protective sleeve 20. The inner protective sleeve 20 covers the explosion-proof valve patch. The positive pressure mechanism is connected to the cavity 40 through the opening 11 on the outer protective sleeve 10.

[0028] like Figure 5 As shown, the liquid ingress prevention device for the battery cell explosion-proof valve covers the explosion-proof valve patch 101 of the battery cell 100. The inner protective sleeve 20 completely encloses the explosion-proof valve patch 101. When cleaning the battery cell explosion-proof valve, the brush is separated from the explosion-proof valve patch to avoid direct contact and protect the explosion-proof valve patch. The positive pressure mechanism is connected to the cavity 40 through the opening 11 on the outer protective sleeve 10. Gas is blown into the cavity 40 to form positive pressure, which can prevent liquid from entering the explosion-proof valve and avoid corrosion caused by water ingress during cleaning. The positive pressure mechanism of this utility model uses an air pump M2.

[0029] To better match the explosion-proof valve for the battery cell, the outer protective sleeve 10 and inner protective sleeve 20 of this utility model are similar in shape to the explosion-proof valve patch 101. The distance between the edge of the outer protective sleeve 10 and the explosion-proof valve patch is 10mm, and the distance between the edge of the inner protective sleeve 20 and the explosion-proof valve patch is 5mm. The outer protective sleeve 10 is made of relatively hard rubber, and the inner protective sleeve 20 is made of relatively soft rubber, which can make close contact with the battery cell 100 and ensure the sealing of the cavity 40. The rib plate 30 is made of rubber. Corrosion-resistant materials with good rigidity are selected, and the positioning accuracy requirement of ±1mm ensures the pressing strength.

[0030] The cell explosion-proof valve liquid ingress prevention device also includes a control circuit, such as... Figure 7As shown, the control circuit includes a main switch SA1, a switch SA2, a feed sensor SL1, a first contactor SL2, a discharge sensor SL3, a second contactor SL4, relays KM1, KM2, and KM3, motors M1 and M3. One end of the main switch SA1 is connected to three-phase power, and the other end is connected to one end of the normally closed contact SL2B of the first contactor SL2, one end of the normally closed contact SL3B of the discharge sensor SL3, and one end of the normally closed contact SL4B of the second contactor SL4. The other end of the normally closed contact SL2B is connected in series with the normally open contact SL1K of the feed sensor SL1 and then connected to one end of the normally open contact of the relay KM1. The other end of the normally open contact of the relay KM1 is connected to motor M1. The other end of the normally closed contact SL3B is connected in series with the normally open contact SL2K of the first contactor SL2 and then connected to one end of the normally open contact of the relay KM2. The other end of the normally open contact of the relay KM2 is connected to air pump M2. The other end of the normally closed contact SL4B is connected in series with the normally open contact SL3K of the discharge sensor SL3 and then connected to one end of the normally open contact of the relay KM3. The other end of the normally open contact of the relay KM3 is connected to the motor M3. The L1 terminal of the three-phase power supply is connected to one end of the normally closed contact SL2B, one end of the normally closed contact SL3B, and one end of the normally closed contact SL4B. The other end of the normally closed contact SL2B is connected in series with the normally open contact SL1K and then connected to one end of the coil of the relay KM1. The other end of the normally closed contact SL3B is connected in series with the normally open contact SL2K and then connected to one end of the coil of the relay KM2. The other end of the normally closed contact SL4B is connected in series with the normally open contact SL3K and then connected to one end of the coil of the relay KM3. The other end of the coils of the relay KM1, the relay KM2, and the relay KM3 are connected together and then connected to one end of the switch SA2. The other end of the switch SA2 is connected to the other end of the main switch SA1.

[0031] See Figure 6The feed sensor SL1 is located at the feed inlet of the cell cleaning logistics line. The first contactor SL2 is located vertically to the logistics line. The discharge sensor SL3 is located at the discharge outlet of the cell cleaning logistics line. The second contactor SL4 is also located vertically to the logistics line, but at a height greater than that of the first contactor SL2. When a cell reaches the material inlet, it indicates that the cell cleaning process is about to begin. This triggers the feed sensor SL1, closing its normally open contact SL1K. This energizes the coil of relay KM1, causing the normally open contact of relay KM1 to... When the contact is closed, motor M1 is energized and starts, driving the anti-liquid ingress device to press down towards the battery cell. When the anti-liquid ingress device reaches the surface of the battery cell, that is, when the inner protective sleeve 20 just covers the explosion-proof valve patch, the first contactor SL2 is triggered. The normally open contact SL2K closes, the coil of relay KM2 is energized, the normally open contact of relay KM2 closes, and the air pump M2 is energized to start injecting gas into the cavity. At this time, the normally closed contact SL2B of motor M1 circuit opens, and motor M1 stops working. That is, when the anti-liquid ingress device is in place, it no longer presses down. During the battery cell cleaning process, the anti-liquid ingress device moves forward along the material flow line with the battery cell, and the air pump M2 continuously blows gas into the cavity, keeping the cavity under positive pressure. When the battery cell reaches the material outlet, the discharge sensor SL3 is triggered, indicating that the battery cell has completed the cleaning process. The normally open contact SL3K closes, the coil of relay KM3 is energized, the normally open contact of relay KM3 closes, the motor M3 starts, and drives the anti-liquid ingress device to retract and move upward. At this time, the normally closed contact SL3B opens, and the air pump M2 stops blowing air. When the anti-liquid ingress device retracts to its position, the second contactor SL4 is triggered, the normally closed contact SL4B opens, the motor M3 stops working, and the anti-liquid ingress device retracts to its position, waiting for the next cycle.

[0032] This utility model includes multiple explosion-proof valves and anti-liquid ingress devices for battery cells, located above the battery cell cleaning logistics line. Each device protects one battery cell. During the movement of the logistics line, the anti-liquid ingress device moves along with the line. The device can be installed with the entire logistics line and is detachable and its position adjustable. The vertical movement distance of the device is controlled by a servo motor, and its height is adjustable. The feed sensor SL1 and discharge sensor SL3 can be laser beam sensors, and the first contactor SL2 and second contactor SL4 can be limit switches. The closing or closing of the contacts of the feed sensor SL1, discharge sensor SL3, first contactor SL2, and second contactor SL4 is controlled by a PLC, which can be a Siemens S7-300.

[0033] The above embodiments are only used to illustrate the technical solutions of this utility model, and are not intended to limit it. Although this utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some of the technical features. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the embodiments of this utility model.

Claims

1. A battery cell explosion-proof valve anti-liquid ingress device, characterized in that: The liquid ingress prevention device includes an outer protective sleeve (10), an inner protective sleeve (20), a rib plate (30), and a positive pressure mechanism. Both the outer protective sleeve (10) and the inner protective sleeve (20) are open on one side. The inner protective sleeve (20) is located inside the outer protective sleeve (10). One end of the rib plate (30) is connected to the inner surface of the outer protective sleeve (10), and the other end is connected to the outer surface of the inner protective sleeve (20). There is a cavity (40) between the inner surface of the outer protective sleeve (10) and the outer surface of the inner protective sleeve (20). The inner protective sleeve (20) covers the explosion-proof valve patch. The positive pressure mechanism is connected to the cavity (40) through the outer protective sleeve (10).

2. The cell explosion-proof valve anti-liquid ingress device according to claim 1, characterized in that: The outer protective sleeve (10) has an opening (11) that is connected to a positive pressure mechanism.

3. The cell explosion-proof valve anti-liquid ingress device according to claim 1 or 2, characterized in that: The positive pressure mechanism is an air pump M2.

4. The cell explosion-proof valve anti-liquid ingress device according to claim 1, characterized in that: The outer protective sleeve (10) and inner protective sleeve (20) have the same shape as the explosion-proof valve patch. The distance between the edge of the outer protective sleeve (10) and the explosion-proof valve patch and the distance between the edge of the inner protective sleeve (20) and the explosion-proof valve patch are respectively set distances.

5. The cell explosion-proof valve anti-liquid ingress device according to claim 4, characterized in that: The distance between the edge of the outer protective sleeve (10) and the explosion-proof valve patch is 10mm, and the distance between the edge of the inner protective sleeve (20) and the explosion-proof valve patch is 5mm.

6. The cell explosion-proof valve anti-liquid ingress device according to claim 1, characterized in that: There are at least four ribs (30).

7. The cell explosion-proof valve anti-liquid ingress device according to claim 3, characterized in that: The liquid ingress prevention device also includes a control circuit, which includes a main switch SA1, a switch SA2, a feed sensor SL1, a first contactor SL2, a discharge sensor SL3, a second contactor SL4, relays KM1, KM2, and KM3, motors M1 and M3. One end of the main switch SA1 is connected to three-phase power, and the other end is connected to one end of the normally closed contact SL2B of the first contactor SL2, one end of the normally closed contact SL3B of the discharge sensor SL3, and one end of the normally closed contact SL4B of the second contactor SL4. The other end of the normally closed contact SL2B is connected in series with the normally open contact SL1K of the feed sensor SL1 and then connected to one end of the normally open contact of the relay KM1. The other end of the normally open contact of the relay KM1 is connected to motor M1. The other end of the normally closed contact SL3B is connected in series with the normally open contact SL2K of the first contactor SL2 and then connected to one end of the normally open contact of the relay KM2. The other end of the normally open contact of the relay KM2 is connected to... Connecting to air pump M2, the other end of normally closed contact SL4B is connected in series with normally open contact SL3K of discharge sensor SL3 and then connected to one end of normally open contact of relay KM3. The other end of normally open contact of relay KM3 is connected to motor M3. The L1 terminal of the three-phase power supply is connected to one end of normally closed contact SL2B, one end of normally closed contact SL3B, and one end of normally closed contact SL4B respectively. The other end of normally closed contact SL2B is connected in series with normally open contact SL1K and then connected to one end of relay KM1 coil. The other end of normally closed contact SL3B is connected in series with normally open contact SL2K and then connected to one end of relay KM2 coil. The other end of normally closed contact SL4B is connected in series with normally open contact SL3K and then connected to one end of relay KM3 coil. The other ends of relay KM1 coil, relay KM2 coil, and relay KM3 coil are connected together and then connected to one end of switch SA2. The other end of switch SA2 is connected to the other end of main switch SA1.

8. The cell explosion-proof valve anti-liquid ingress device according to claim 7, characterized in that: The feed sensor SL1 is located at the feed inlet of the cell cleaning logistics line, the discharge sensor SL3 is located at the discharge outlet of the cell cleaning logistics line, and the first contactor SL2 and the second contactor SL4 are both located in the vertical direction of the cell cleaning logistics line, with the height of the second contactor SL4 being greater than the height of the first contactor SL2.

9. The cell explosion-proof valve anti-liquid ingress device according to claim 7, characterized in that: The feed sensor SL1 and the discharge sensor SL3 are both laser beam sensors, and the first contactor SL2 and the second contactor SL4 are both limit switches.

10. The cell explosion-proof valve anti-liquid ingress device according to claim 1, characterized in that: There are multiple anti-liquid ingress devices, all located above the battery cell cleaning logistics line, and each anti-liquid ingress device protects a battery cell explosion-proof valve.

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