Embedded overload protection valve

Abstract

The invention relates to the technical field of battery shells, in particular to an embedded overload protection valve which comprises a shell, the shell is of a structure internally provided with a cavity, an insertion strip is arranged on the top face or the bottom face or the side face of the shell in a pressed mode and embedded into the top face or the bottom face or the side face of the shell, and the bottom end of the insertion strip does not protrude out of the other face of the top face or the bottom face or the side face of the shell. The insertion strips are steel strips and are made of stainless steel materials; the shell is opened along the insertion strip after being impacted and overloaded by internal pressure; the shell is novel and simple in structure and reasonable in design, the shell can be directly opened along the insertion strip after being impacted and overloaded by internal pressure, the shell and the insertion strip form a whole, the interior of the shell is seamless, the shell is not prone to cracking even if vibration and distortion occur, the shell can be well machined at a time, the consistency cpk of bursting pressure is larger than or equal to 2.0, and the service life of the shell is prolonged. The stability is greatly improved, the tonnage of processing equipment is small, the equipment investment is reduced, the production cost is reduced, and the working efficiency is improved.

Description

[Technical field]

[0001] The invention relates to the technical field of battery shells, in particular to an embedded overload protection valve. [Background Technology]

[0002] As an emerging energy storage medium, new energy batteries have attracted more and more attention due to their advantages such as high energy density, high output power, long charge and discharge life, fast charging, green and pollution-free, wide operating temperature range and low self-discharge. During the battery charging and discharging process, the internal gas production pressure is an extremely important safety factor. During the use of the battery, due to overcharging, over-discharging, short circuit and other reasons, high-temperature and high-pressure gas may be generated inside the battery. If these high-temperature and high-pressure gases are not discharged to the outside of the battery in time, it may cause serious accidents such as battery disintegration, explosion, fire, etc.

[0003] The battery structural parts in new energy power batteries or energy storage power stations must be opened explosion-proof when the gas pressure in the battery shell reaches 0.7MPa to 2.3MPa. This is because the aluminum or steel materials of the new energy battery will explode before a short circuit occurs, or the electrolyte and other materials will decompose to produce gas and explode after charging for a long time.

[0004] Therefore, if the battery shell cannot release gas in time, it will cause unsafe conditions for the vehicle energy storage power station while driving. At the same time, excessive pressure can easily cause damage to internal materials. [Summary of the invention]

[0005] The purpose of the present invention is to solve the above-mentioned shortcomings and provide an embedded overload protection valve, which can realize that the shell is directly opened along the fillet after being overloaded by internal pressure impact. The shell and the fillet form a whole, there is no gap inside, and it is not easy to crack even if vibration and distortion occur. Moreover, it can be processed in one time, and the processing equipment has a small tonnage. While reducing equipment investment, it reduces production costs and improves work efficiency.

[0006] In order to achieve the above purpose, an embedded overload protection valve is designed, comprising a shell 1, wherein the shell 1 is a structure with a cavity inside, and a fillet 2 is pressed on the top surface, bottom surface or side surface of the shell 1, wherein the fillet 2 is embedded in the top surface, bottom surface or side surface of the shell 1, and the bottom end of the fillet 2 does not protrude from the other side of the top surface, bottom surface or side surface of the shell, and the shell 1 opens along the fillet after being overloaded by internal pressure shock.

[0007] Furthermore, the fillet 2 is in the shape of a strip, arranged vertically, and pressed into the top surface, bottom surface or side surface of the shell 1 along the vertical direction, so that it can be pressed in better and the blasting is more reliable.

[0008] Furthermore, the top end of the fillet 2 is flush with the top surface, bottom surface or side surface of the shell 1, and a reserved thickness is provided between the bottom end of the fillet 2 and the other surface of the top surface, bottom surface or side surface of the shell 1, thereby further making the shell 1 and the fillet 2 form a whole, avoiding cracking due to distortion or vibration.

[0009] Furthermore, the reserved thickness is 0.06 mm-0.28 mm, thereby achieving the purpose of an explosion-proof pressure of 0.7 MPa to 2.3 MPa.

[0010] Furthermore, the fillet 2 is a steel bar, preferably made of metal materials such as 65Mn steel or stainless steel (different metal materials can be used according to cost requirements), which can be pressed in more conveniently while ensuring the overall performance of the shell 1.

[0011] Furthermore, the cross section of the fillet 2 is in various shapes including but not limited to “O”, “U”, “S”, “H”, “C”, “I” or “W” shapes.

[0012] Furthermore, the shell 1 is in a square box shape, a round tube shape, a diamond shape, a triangle shape or other shapes, and the shell 1 is made of aluminum or steel, which further realizes rapid outward explosion and quick release of internal air pressure.

[0013] The present invention also provides a processing method for an embedded overload protection valve, comprising the following steps: first, a shell 1 is made of aluminum or steel, and the shell 1 is designed to be a square box shape, a round tube shape, a diamond shape, a triangle shape, etc.; then, the fillet 2 is pressed into the top cover or the bottom cover or the tube cover of the shell 1, so that the fillet 2 is embedded in the top cover or the bottom cover or the tube cover to form a whole.

[0014] Furthermore, the top end of the fillet 2 is flush with the outer surface of the top cover or bottom or tube cover of the shell 1, and a reserved thickness is set between the bottom end of the fillet 2 and the inner surface of the top cover or bottom or tube cover of the shell 1, and the reserved thickness is 0.06mm-0.28mm.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] (1) Before the present invention was improved, the grooves were first extruded and then punched. Since the remaining thickness was relatively thin, when the ground was uneven, there would be vibration, distortion and torsion, and the grooves were greatly affected and easily cracked. However, the present invention embeds the metal steel bar to form a whole with no gap inside. Even if distortion occurs, it is not easy to crack;

[0017] (2) Since the present invention directly presses a thinner metal steel insert into the mold, the thickness of the reserved substrate can be accurately guaranteed, while the thickness of the traditional notch is difficult to control, such as the difficulty in controlling the extrusion and the fragility of the mold punch;

[0018] (3) The present invention can be processed in one go, with high efficiency, and the processing equipment has a small tonnage. For example, the traditional processing equipment requires 400 tons, while the present invention only requires 100 tons. Not only is the equipment investment much lower, the production cost is reduced, but the efficiency is also extremely high, which greatly improves safety.

[0019] (4) The fillet of the present invention can be arranged on any surface of the shell, and its arrangement is flexible, the structure is simple, and it is easy to process. When the battery is overloaded due to a large pressure inside, it can be opened in time to release the pressure to avoid battery explosion, thereby improving the safety and stability of the battery. The bursting pressure consistency cpk is greater than or equal to 2.0.

[0020] (5) The present invention can be mass-produced through one-time design and mold cost, which reduces the production cost, and the processing technology is simple, which greatly improves the production efficiency, achieves the purpose of explosion-proof and safe operation of batteries, and is worthy of popularization and application. [Drawings]

[0021] Figure 1 The structure of the present invention is schematically shown in FIG. Figure 1 ;

[0022] Figure 2 The structure of the present invention is schematically shown in FIG. Figure 2 ;

[0023] Figure 3 The structure of the present invention is schematically shown in FIG. Figure 3 ;

[0024] Figure 4 The structure of the present invention is schematically shown in FIG. Figure 4 ;

[0025] Figure 5 yes Figure 1 A schematic diagram of a top view structure;

[0026] Figure 6 yes Figure 3 A schematic diagram of a top view structure;

[0027] Figure 7 yes Figure 5 A schematic diagram of a top view structure;

[0028] Figure 8 yes Figure 7 A schematic diagram of a top view structure;

[0029] Fig. 9 The structure of the fillet of the present invention is schematically shown in FIG. Figure 1 ;

[0030] Fig.10 It is a schematic structure of the strip of the present invention Figure 2 ;

[0031] Fig.11 It is a schematic structure of the strip of the present invention Figure 3 ;

[0032] Fig.12 It is a schematic structure of the strip of the present invention Figure 4 ;

[0033] In the figure: 1. housing 2. strip [Specific Embodiment]

[0034] The present invention will be further described below with reference to the accompanying drawings:

[0035] As shown in the attached Figure 1 to the attached Fig.12 shown, the present invention provides an embedded overload protection valve, including a housing 1, the housing 1 has a cavity inside, a strip 2 is pressed on the top surface, bottom surface or side surface of the housing 1, the strip 2 is embedded within the top surface, bottom surface or side surface of the housing 1, and the bottom end of the strip 2 does not protrude from the other side of the top surface, bottom surface or side surface of the housing, and the housing 1 opens along the strip after being impacted by internal gas pressure overload

[0036] Among them, the strip 2 is in the shape of a strip, the strip is arranged vertically, and is pressed vertically into the top surface, bottom surface or side surface of the housing 1, so that it can be better pressed in and the blasting is more reliable. The top end of the strip 2 is flush with the top surface, bottom surface or side surface of the housing 1, and a reserved thickness is provided between the bottom end of the strip 2 and the other side of the top surface, bottom surface or side surface of the housing 1, so as to further make the housing 1 and the strip 2 form a whole and avoid cracking due to distortion or vibration; the reserved thickness is preferably 0.06 mm - 0.28 mm, so as to achieve the purpose of explosion-proof pressure of 0.7 MPa to 2.3 MPa

[0037] The housing 1 is in the shape of a square box, a circular tube, a rhombus or a triangle, and the housing 1 is made of aluminum or steel to further achieve rapid outward blasting and rapid release of internal air pressure. The strip 2 is a steel strip, and can be made of materials such as 65Mn steel or stainless steel, which can be more conveniently pressed in while ensuring the overall performance of the housing 1. The cross-section of the strip 2 is but not limited to various shapes such as "O", "U", "S", "H", "C", "I" or "king" characters; as shown in the attached Figure 1 and the attached Figure 5 and the attached Fig. 9 shown, the strip 2 is designed as an open-loop "O" shape; as shown in the attached Figure 2 and the attached Figure 6 and the attached Fig.10As shown, the fillet 2 is designed as a closed loop "O" shape; Figure 3 , Attachment Figure 7 and attached Fig.11 As shown, the fillet 2 is designed to be "U" shaped; Figure 4 , Attachment Figure 8 and attached Fig.12 As shown, the fillet 2 is designed to be a "U" shape with the top bent inward. It can be seen that the cross-sectional shape of the fillet 2 is not limited.

[0038] The present invention provides a processing method for an embedded overload protection valve, comprising the following steps: 1) first, a shell 1 (i.e., a battery shell) is made of aluminum or steel, and the shell 1 can be designed to be a square box, a round tube, a rhombus, a triangle, etc.; 2) then, a fillet 2 is pressed into a top cover, a bottom cover, or a tube cover of the shell 1, so that the fillet 2 is embedded in the top cover, the bottom cover, or the tube cover to form a whole, the top end of the fillet 2 is flush with the outer surface of the top cover, the bottom cover, or the tube cover of the shell 1, and a reserved thickness is set between the bottom end of the fillet 2 and the inner surface of the top cover or the tube cover, and the reserved thickness is 0.06mm-0.28mm.

[0039] Compared with the previous structure, the present invention has the following significant effects:

[0040] (1) Before the improvement, the present invention first forms an extrusion layer by extrusion, and then punches a score line on the extrusion layer. The score line ruptures after being subjected to the pressure impact inside the battery shell to achieve pressure relief. Since the score is a large groove pressed down, the thickness left is relatively thin. When subjected to torque, there will be stress, which makes it easy to crack. The present invention directly presses the stainless steel bar into it, that is, embeds the metal bar into it, so that there is no gap inside, forming a whole. When subjected to torque, the material inside it forms a whole with the substrate, and the impact is very small, so it is not easy to crack.

[0041] (2) When the present invention is installed on a vehicle for use, the uneven ground will cause vibration and distortion. The traditional notched areas will receive torque, which has a relatively large impact. However, the improved present invention is an embedded whole, so the force is evenly applied and all the force can be transmitted. Even if distortion occurs, it will not cause any impact.

[0042] (3) The present invention can accurately ensure the thickness of the reserved substrate by directly pressing a thinner fillet / steel bar into the substrate. For example, if the material is 1.5 thick and the fillet is pressed into the substrate with a thickness of 1.3, the reserved thickness can be 0.2. However, the reserved thickness of the conventional notch is difficult to control. On the one hand, the thickness of the extruded layer is difficult to control. On the other hand, the punch is easy to be damaged, which will have an uncontrollable impact on it.

[0043] (4) The present invention is not only not afraid of torsion or vibration and is not prone to cracking during use, but also can be processed in one go, with high processing efficiency. The processing equipment has a small tonnage. For example, traditional scoring processing equipment often requires 400 tons, while the present invention can be achieved with a maximum of 100 tons. It can be seen that the equipment investment is much lower, the cost is reduced, the efficiency is extremely high, and the safety is greatly improved.

[0044] The contents not described in detail in this specification belong to the prior art known to professional and technical personnel in the field. The standard parts used can be purchased from the market, and special-shaped parts can be customized according to the records in the specification and drawings. The specific connection methods of each part adopt mature conventional means such as bolts, rivets, welding, etc. in the prior art. The machinery, parts and equipment adopt conventional models in the prior art, and the circuit connection adopts the conventional connection method in the prior art, which will not be described in detail here.

[0045] The present invention is not limited to the above-mentioned embodiments, and any other changes, modifications, substitutions, combinations, and simplifications made without departing from the spirit and principles of the present invention shall be equivalent replacement methods and shall be included in the protection scope of the present invention.

Claims

1. An embedded overload protection valve, characterized in that: It includes a housing (1) which has a cavity inside. An inlay strip (2) is pressed on the top surface, bottom surface or side surface of the housing (1). The inlay strip (2) is embedded within the top surface, bottom surface or side surface of the housing (1), and the bottom end of the inlay strip (2) does not protrude beyond the other side of the top surface, bottom surface or side surface of the housing. The housing (1) opens along the inlay strip after being impacted by internal pressure overload.

2. The embedded overload protection valve according to claim 1, characterized in that: The inlay strip (2) is in the shape of a strip. The inlay strip is arranged vertically and is pressed vertically into the top surface, bottom surface or side surface of the housing (1).

3. The embedded overload protection valve according to claim 2, characterized in that: The top end of the inlay strip (2) is flush with the top surface, bottom surface or side surface of the housing (1), and a reserved thickness is provided between the bottom end of the inlay strip (2) and the other side of the top surface, bottom surface or side surface of the housing (1).

4. The embedded overload protection valve according to claim 3, characterized in that: The reserved thickness is 0.06 mm - 0.28 mm.

5. The embedded overload protection valve according to claim 1, characterized in that: The inlay strip (2) is a steel strip, preferably made of metal materials such as 65Mn steel or stainless steel.

6. The embedded overload protection valve according to claim 1, characterized in that: The cross-section of the inlay strip (2) is, but not limited to, various shapes such as "O", "U", "S", "H", "C", "工" or "王".

7. The embedded overload protection valve according to claim 1, characterized in that: The housing (1) is in the shape of a square box, a circular tube, a rhombus or a triangle, and the housing (1) is made of aluminum or steel.

8. A method for processing an embedded overload protection valve according to any one of claims 1 to 7, characterized in that , including the following steps: First, make the housing (1) with aluminum or steel, and design the housing (1) as a square box, a circular tube, a rhombus or a triangle; then, press the inlay strip (2) into the top cover, bottom or pipe cover of the housing (1) so that the inlay strip (2) is embedded in the top cover, bottom or pipe cover to form a whole.

9. The processing method of the embedded overload protection valve according to claim 8, characterized in that: The top end of the inlay strip (2) is flush with the outer surface of the top cover, bottom or pipe cover of the housing (1), and a reserved thickness is provided between the bottom end of the inlay strip (2) and the inner surface of the top cover, bottom or pipe cover of the housing (1), and this reserved thickness is 0.06 mm - 0.28 mm.

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