A lithium battery deformation detection and display device

Abstract

The present invention discloses a deformation detection and display device for a lithium battery, comprising a cover plate with a liquid contact surface and a liquid injection surface; the cover plate is provided with a safety valve; the safety valve is located near the edge of the cover plate; the safety valve includes a first layer; the first layer is flush with the liquid contact surface; the safety valve includes a second layer having a force-bearing surface and a surface B; the second layer is flush with the liquid injection surface; and the first layer and the second layer do not fit together. The present invention has the beneficial effect of limiting the secondary use of deformed lithium batteries. The weak area provided on the first layer makes it easier for the safety valve to release pressure. The second layer serves as a second barrier to prevent leakage of lithium battery liquid. The second layer has a color-reflecting surface that can detect the acidity and alkalinity of the lithium battery liquid, facilitating lithium battery recycling and processing.

Description

Technical Field

[0001] The present invention belongs to the field of lithium battery manufacturing, relates to deformation detection and display of lithium batteries, and particularly relates to a deformation detection and display device for lithium batteries. Background Art

[0002] Lithium battery manufacturing primarily involves designing a suitable lithium battery casing based on application requirements and encapsulating the battery cells within the casing to create a lithium battery product. To prevent explosions within the sealed metal casing, modern lithium batteries are equipped with a safety valve on top, a crucial explosion-proof barrier. When excessive pressure builds up within the battery, the valve ruptures to release pressure and prevent an explosion. However, if the valve ruptures, the chemicals leaking from the battery react with oxygen in the air at high temperatures, potentially igniting a fire.

[0003] Existing safety valves such as Figure 1 Expansion occurs after overpressure, and the safety valve ruptures and releases pressure after overload, which is irreversible. Currently, there is a phenomenon in the market where deformed safety valves are knocked back to their pre-deformation state and resold, posing a significant safety hazard. Furthermore, safety valve rupture and pressure release often result in secondary hazards such as short-circuiting of the lithium battery pack due to leaked lithium battery fluid. Summary of the Invention

[0004] In order to solve the above-mentioned problems in the prior art, the present invention provides a deformation detection and display device for a lithium battery.

[0005] In order to achieve the above object, the technical solution adopted by the present invention is:

[0006] A lithium battery deformation detection and display device, characterized by comprising:

[0007] A cover plate having a liquid contact surface and a liquid injection surface;

[0008] The cover plate is provided with a safety valve; and

[0009] The safety valve is close to the edge of the cover plate;

[0010] Wherein, the safety valve comprises a first layer; and,

[0011] The first layer is flush with the liquid contact surface;

[0012] Wherein, the safety valve comprises a second layer having a force-bearing surface; and,

[0013] The second layer is flush with the liquid injection surface;

[0014] wherein the first layer and the second layer do not fit together;

[0015] Preferably, both the first layer and the second layer are circular; and,

[0016] The first plane and the second plane have the same diameter;

[0017] Preferably, the first layer is easily deformed under the action of internal pressure;

[0018] Wherein, the second layer is not easily deformed under the action of internal pressure;

[0019] Preferably, when the lithium battery is over-pressurized, the first layer is deformed; and

[0020] The deformation direction is from the first level to the second level; and,

[0021] When the maximum deformation is reached, the first layer is in contact with the second layer;

[0022] Preferably, the first layer has a weak area; and,

[0023] The weak area is an area on the first layer that is prone to rupture under the action of internal pressure;

[0024] Preferably, the weak area includes three breakable lines; and,

[0025] The three fragile lines are evenly distributed on the weak area;

[0026] Preferably, the three breakable lines have only one intersection point; and,

[0027] The intersection is a cracking point;

[0028] Preferably, the second layer is transparent;

[0029] Preferably, the second layer has a color-developing surface; and,

[0030] The color-developing surface is located on the force-bearing surface;

[0031] Among them, the color-developing side turns into color A when it encounters acid, and turns into color B when it encounters alkali; and

[0032] The color A is different from the color B;

[0033] Preferably, the color-developing component of the color-developing surface is litmus solution.

[0034] The beneficial effects of the present invention are reflected in that a deformation detection and display device for a lithium battery is provided. The safety valve is set on two levels, which can limit the secondary use of deformed lithium batteries. A weak area is set on the first level to make it easier for the safety valve to release pressure. After the first level is ruptured, the space between the first level and the second level becomes a buffer zone, and the second level becomes a second barrier to prevent the leakage of lithium battery fluid. The second level has a color display surface, which can detect the acidity and alkalinity of the lithium battery fluid, making it convenient for lithium battery recycling and processing. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] Figure 1 It is a structural schematic diagram of a comparative example of the present invention;

[0036] Figure 2 is a schematic diagram of a three-dimensional cross-sectional structure of an embodiment of the present invention;

[0037] Figure 3 Schematic diagram of the cross-sectional structure of an embodiment of the present invention;

[0038] Figure 4 This is a schematic diagram of the first-level structure of an embodiment of the present invention;

[0039] Figure 5 Schematic diagram of the load-bearing surface structure of an embodiment of the present invention. DETAILED DESCRIPTION

[0040] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0041] See also Figure 1-5 As shown, the specific embodiments provided by the present invention are as follows:

[0042] Example 1:

[0043] A lithium battery deformation detection and display device, characterized by comprising:

[0044] A cover plate 1 having a liquid contact surface 3 and a liquid injection surface 4;

[0045] The cover plate 1 is provided with a safety valve 2; and,

[0046] The safety valve 2 is close to the edge of the cover plate 1;

[0047] Wherein, the safety valve 2 comprises a first layer 5; and,

[0048] The first layer 5 is flush with the liquid contact surface 3;

[0049] The safety valve 2 includes a second surface 6 having a force-bearing surface 7; and

[0050] The second layer 6 is flush with the liquid injection surface 4;

[0051] The first layer 5 and the second layer 6 are not in contact with each other.

[0052] Lithium batteries deform due to internal overpressure during use. The safety valve is more susceptible to deformation than the lithium battery casing and cover. Therefore, there is a phenomenon in the market where deformed safety valves are knocked back to their pre-deformation state and resold. If the internal pressure is overloaded, the safety valve will rupture, causing the lithium battery fluid to leak, polluting the environment and posing a safety hazard.

[0053] In this embodiment, the present invention provides a deformation detection and display device for a lithium battery, wherein the safety valve has a first layer flush with the liquid contact surface and a second layer flush with the liquid filling surface. When the first layer is deformed, the lithium battery user observes the deformation of the first layer through the second layer and replaces the lithium battery in time. Due to the existence of the second layer, the first layer cannot be knocked back to the state before deformation unless the second layer is destroyed, thereby preventing the secondary sale of the lithium battery; if the first layer is overloaded and ruptures, and the lithium battery liquid leaks, the space between the first layer and the second layer will become a buffer area, and the second layer will also become a second barrier to prevent the leakage of lithium battery liquid.

[0054] Example 2:

[0055] The first layer 5 and the second layer 6 are both circular; and

[0056] The first layer 5 and the second layer 6 have the same diameter.

[0057] In this embodiment, the present invention provides a lithium battery deformation detection and display device, wherein the first and second layers are both circular, and the first and second layers have the same diameter. Circles have no sharp corners, and the force applied to each point is more uniform, resulting in a better deformation response effect.

[0058] Example 3:

[0059] The first layer 5 is easily deformed under the action of internal pressure;

[0060] The second layer 6 is not easily deformed under the action of internal pressure.

[0061] In this embodiment, the present invention provides a deformation detection and display device for a lithium battery. The first layer is easily deformed under the action of internal pressure, while the second layer is not easily deformed under the action of internal pressure. However, both the first layer and the second layer are more likely to rupture than the outer shell, thereby achieving the effect of exhaust and pressure relief to prevent the lithium battery from exploding.

[0062] Example 4:

[0063] When the lithium battery is over-pressurized, the first layer 5 is deformed; and

[0064] The deformation direction is from the first layer 5 to the second layer 6; and,

[0065] When the maximum deformation is reached, the first layer 5 and the second layer 6 are in contact.

[0066] In this embodiment, the present invention provides a deformation detection and display device for a lithium battery. When an internal overpressure occurs in a lithium battery, the first layer deforms from the first layer toward the second layer. At maximum deformation, the first and second layers come into contact. After the first layer ruptures, the second layer will not rupture unless the overpressure persists or increases. If the maximum deformation of the first layer exceeds this range, the second layer may rupture before the first, defeating its protective function.

[0067] Example 5:

[0068] The first layer 5 has a weak area 8; and,

[0069] The weak area 8 is an area on the first layer 5 that is prone to rupture under the action of internal pressure.

[0070] During assembly, the safety valve needs to be aligned with a through hole on the insulating sheet to ensure that the pressure relief function can be achieved. However, if perfect alignment is to be achieved, the assembly cost increases and the assembly efficiency decreases.

[0071] In this embodiment, the present invention provides a deformation detection and display device for a lithium battery, wherein the first layer has a weak area, which is an area on the first layer that is easily broken under the action of internal pressure. During assembly, technicians only need to ensure that the through holes on the insulating sheet are aligned with the weak area. Even if an error occurs, it will not affect the pressure relief effect. Moreover, the existence of the weak area makes the safety valve easier to break, and the explosion-proof effect is better.

[0072] Example 6:

[0073] The weak area 8 includes three breakable lines 9; and,

[0074] The three breakable lines 9 are evenly distributed on the weak area 8;

[0075] Preferably, the three breakable lines 9 have only one intersection; and,

[0076] The intersection point is a cracking point 10.

[0077] In this embodiment, the present invention provides a deformation detection and display device for a lithium battery. The weak zone includes three breakable lines evenly distributed across the weak zone. The three breakable lines have a single intersection, which serves as the breakable point. When overpressure occurs within the lithium battery, the weak point ruptures first, followed by ruptures along the breakable lines, resulting in improved pressure relief.

[0078] Example 7:

[0079] The second layer 6 is transparent.

[0080] In this embodiment, the present invention provides a lithium battery deformation detection and display device, wherein the second layer is transparent, and the deformation of the first layer can be observed through the second layer.

[0081] Example 8:

[0082] The second layer 6 has a color developing surface 11; and,

[0083] The color developing surface 11 is located on the force bearing surface 7;

[0084] The color-developing surface 11 changes from transparent color to color A when it encounters acid, and changes from transparent color to color B when it encounters alkali; and

[0085] The color A is different from the color B.

[0086] In this embodiment, the present invention provides a lithium battery deformation detection and display device. The second layer has a color display surface, which is located on the stress-bearing surface. The transparent color display surface changes to color A when exposed to acid, and changes to color B when exposed to alkali. Colors A and B are different. When the first layer ruptures, the lithium battery fluid contacts the color display surface, causing the color to change. This makes it easier for users to detect that the lithium battery is unusable. Furthermore, during recycling, the battery can be separated based on the color displayed on the color display plate, improving efficiency.

[0087] Example 9:

[0088] The color-developing component of the color-developing surface 11 is litmus solution.

[0089] In this embodiment, the present invention provides a deformation detection and display device for a lithium battery. The color developing component of the color developing surface is litmus solution. The litmus solution turns red when exposed to acid and turns blue when exposed to alkali, which is convenient for observation.

[0090] In the description of the embodiments of the present invention, it needs to be understood that terms such as "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "center", "top", "bottom", "top", "bottom", "inside", "outside", "inside", and "outside" indicate directions or positional relationships.

[0091] In the description of the embodiments of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," "connected," and "assembled" should be understood in a broad sense. For example, they may refer to fixed connections, detachable connections, or integral connections; they may refer to direct connections, indirect connections through an intermediate medium, or internal connections between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention in specific circumstances.

[0092] In the description of the embodiments of the present invention, specific features, structures, materials or characteristics may be combined in an appropriate manner in any one or more embodiments or examples.

[0093] In describing the embodiments of the present invention, it should be understood that "-" and "~" represent a range between two values, and the range includes the endpoints. For example, "AB" represents a range greater than or equal to A and less than or equal to B. "A~B" represents a range greater than or equal to A and less than or equal to B.

[0094] In describing the embodiments of the present invention, the term "and / or" is used herein to describe a relationship between associated objects, indicating that three possible relationships exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Furthermore, the character " / " is generally used herein to indicate that the associated objects are in an "or" relationship.

[0095] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to these embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the appended claims and their equivalents.

Claims

1. A battery deformation detection and display device, characterized in that: include: A cover plate having a liquid contact surface and a liquid injection surface; The cover plate is provided with a safety valve; and, The safety valve is close to the edge of the cover plate; Wherein, the safety valve comprises a first layer; and, The first layer is flush with the liquid contact surface; Wherein, the safety valve comprises a second layer having a force-bearing surface; and, The second layer is flush with the liquid injection surface; wherein the first layer and the second layer do not fit together; The first layer is susceptible to deformation under the action of internal pressure; Wherein, the second layer is not easily deformed under the action of internal pressure; The second layer has a color-developing surface.

2. A battery deformation detection and display device according to claim 1, characterized in that: The first layer and the second layer are both circular; and The diameters of the first and second planes are the same.

3. A battery deformation detection and display device according to claim 2, characterized in that: When the battery is over-pressurized, the first layer deforms; and The deformation direction is from the first level to the second level; and, When the maximum deformation is reached, the first layer is in contact with the second layer.

4. A battery deformation detection and display device according to claim 3, characterized in that: The first layer has a weak area; and The weak area is an area on the first layer that is prone to rupture under the action of internal pressure.

5. A battery deformation detection and display device according to claim 4, characterized in that: The weak area includes three breakable lines; and, The three breakage lines are evenly distributed on the weak area.

6. A battery deformation detection and display device according to claim 5, characterized in that: The three breakable lines have only one intersection point; and The intersection is a cracking point.

7. A battery deformation detection and display device according to any one of claims 1 to 6, characterized in that: The second layer is transparent.

8. A battery deformation detection and display device according to claim 7, characterized in that: The color-developing surface is located on the force-bearing surface; Among them, the color-developing side turns into color A when it encounters acid, and turns into color B when it encounters alkali; and The color A is different from the color B.

9. A battery deformation detection and display device according to claim 8, characterized in that: The color-developing component of the color-developing surface is litmus solution.

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