Battery cover plate and power battery

Abstract

The invention provides a battery cover plate and a power battery, and the battery cover plate comprises a light cover plate which is provided with a pole hole and a connecting hole, and the pole hole and the connecting hole vertically penetrate through the light cover plate; the pole is arranged in the pole hole; the lower plastic is arranged at the bottom of the light cover plate and is provided with a connecting part, the connecting part is arranged in the connecting hole, and the connecting part is provided with a liquid injection port; and the sealing column is inserted into the liquid injection opening, the sealing column is in interference fit with the liquid injection opening, and the sealing column can be separated from the liquid injection opening under the action of pressure difference under the condition that the pressure intensity in the power battery is greater than the environmental pressure intensity. The sealing column can play a role in sealing the liquid injection opening, welding is not needed, the situation that the whole battery cover plate is scrapped due to the welding quality problem is avoided, meanwhile, under the situation that the pressure intensity in the power battery is larger than the environment pressure intensity, the sealing column can be separated from the liquid injection opening under the pressure difference effect, and the sealing effect is good. Therefore, gas in the power battery can be released to the outside through the liquid injection port, the pressure relief effect is achieved, and an anti-explosion valve does not need to be additionally arranged.

Description

Technical Field

[0001] The present application relates to the technical field of storage batteries, and in particular to a battery cover and a power battery. Background Art

[0002] Power batteries are storage batteries that provide power for electric vehicles, electric trains, electric bicycles, etc. As an important component of power batteries, the quality of the battery cover directly affects the working performance of the power battery.

[0003] At present, battery covers on the market are generally equipped with explosion-proof valves and liquid injection ports. The explosion-proof valves can relieve pressure, while the liquid injection ports are used to inject battery liquid into the power battery. Sealing aluminum nails are then fixed in the liquid injection ports by welding to seal the liquid injection ports. However, the separate settings of the explosion-proof valves and the liquid injection ports increase the structural complexity of the battery cover. At the same time, during the welding process of the sealing aluminum nails, any welding quality problems will cause the entire battery cover to be scrapped, increasing costs. Summary of the invention

[0004] The embodiment of the present application provides a battery cover and a power battery to solve the problems existing in the related technology. The technical solution is as follows:

[0005] In a first aspect, an embodiment of the present application provides a battery cover, comprising:

[0006] A light cover plate, wherein the light cover plate has a pole hole and a connection hole, wherein both the pole hole and the connection hole penetrate the light cover plate from top to bottom;

[0007] A pole, wherein the pole is arranged in the pole hole;

[0008] A lower plastic, the lower plastic is disposed on the bottom of the optical cover, the lower plastic is provided with a connecting portion, the connecting portion is disposed in the connecting hole, the connecting portion has a liquid injection port, and the liquid injection port passes through the lower plastic both from top to bottom; and

[0009] A sealing column is inserted into the liquid injection port, and the sealing column is interference fit with the liquid injection port to seal the liquid injection port. When the pressure inside the power battery is greater than the ambient pressure, the sealing column can be separated from the liquid injection port under the action of the pressure difference.

[0010] In one embodiment, the upper end of the liquid injection port is a guide section, and the cross-section of the guide section gradually increases from bottom to top.

[0011] In one embodiment, the sealing column is a structure made of stainless steel or brass.

[0012] In one embodiment, the lower plastic is integrally formed on the optical cover plate by injection molding.

[0013] In one embodiment, the connecting hole comprises an upper hole section and a lower hole section, and the hole diameter of the upper hole section is larger than the hole diameter of the lower hole section;

[0014] The connecting portion includes an upper connecting section and a lower connecting section, wherein the upper connecting section is adapted to fit the upper hole section, and the lower connecting section is adapted to fit the lower hole section.

[0015] In one embodiment, the diameter of the upper hole section gradually increases from bottom to top.

[0016] In one embodiment, a first annular portion is provided at the bottom of the optical cover plate, the first annular portion is arranged around the lower end of the connecting hole, the lower plastic has a first annular groove, and the first annular groove and the first annular portion are adapted.

[0017] In one embodiment, the bottom of the optical cover has a second annular groove, the second annular groove is arranged around the first annular portion, the lower plastic has a second annular portion, and the second annular portion and the second annular groove are adapted.

[0018] In one embodiment, the bottom of the optical cover plate has a third annular groove, and the third annular groove is arranged around the pole hole;

[0019] A convex ring is provided at the lower part of the pole, the convex ring is arranged around the axial center line of the pole, and the outer diameter of the convex ring is larger than the hole diameter of the pole hole and smaller than the groove width of the third annular groove;

[0020] The battery cover also includes:

[0021] An upper plastic, the upper plastic being disposed on the top of the optical cover, the upper plastic being disposed around the pole, and the upper plastic being located between the optical cover and the outer peripheral wall of the pole; and

[0022] A sealing ring is sleeved on the pole and clamped between the top wall of the convex ring and the bottom wall of the third annular groove.

[0023] In one embodiment, the lower plastic is provided with a third annular portion, the third annular portion is arranged around the sealing ring, and the third annular portion is sandwiched between the bottom wall of the third annular groove and the top wall of the convex ring.

[0024] In a second aspect, an embodiment of the present application provides a power battery, comprising the above-mentioned battery cover.

[0025] The advantages or beneficial effects of the above technical solution include at least:

[0026] The battery cover of the present invention has a certain elasticity. By providing a liquid injection port on the lower plastic and by interference fit between the sealing column and the liquid injection port, a certain deformation and extrusion force can be generated in the lower plastic or between the lower plastic and the sealing column, thereby ensuring that the sealing column can be tightly connected to the lower plastic, and can effectively prevent the sealing column from being separated from the lower plastic when not affected by the pressure difference. At the same time, it can also play the role of sealing the liquid injection port. No welding is required, and the entire battery cover will not be scrapped due to welding quality problems, thereby ensuring the sealing reliability. At the same time, since the sealing column and the liquid injection port have an interference fit, when the pressure inside the power battery is greater than the ambient pressure, the sealing column can be separated from the liquid injection port under the action of the pressure difference, so that the gas inside the power battery can be released to the outside through the liquid injection port, thereby playing a pressure relief role. There is no need to provide an explosion-proof valve separately, which can simplify the processing technology of the battery cover and help reduce the cost of the battery cover.

[0027] The above summary is for illustrative purposes only and is not intended to be limiting in any way. In addition to the illustrative aspects, embodiments and features described above, further aspects, embodiments and features of the present application will be readily apparent by reference to the accompanying drawings and the following detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] In the accompanying drawings, unless otherwise specified, the same reference numerals throughout the multiple drawings represent the same or similar parts or elements. These drawings are not necessarily drawn to scale. It should be understood that these drawings only depict some embodiments disclosed in the present application and should not be regarded as limiting the scope of the present application.

[0029] Figure 1 It is a front view of the battery cover of the present invention;

[0030] Figure 2 is a cross-sectional view of a battery cover of the present invention;

[0031] Figure 3 for Figure 2 A local enlarged view of point A in FIG.

[0032] Figure 4 for Figure 2 A local enlarged view of point B in FIG.

[0033] Figure 5 is an exploded view of the battery cover of the present invention;

[0034] Figure 6 It is a schematic diagram of the three-dimensional structure of the lower plastic in the present invention.

[0035] Reference numerals

[0036] 1. Optical cover; 11. Pole hole; 12. Connecting hole; 121. Upper hole section; 122. Lower hole section; 13. First annular portion; 14. Second annular groove; 15. Third annular groove; 2. Pole; 21. Convex ring; 3. Lower plastic; 31. Connecting portion; 311. Upper connecting section; 312. Lower connecting section; 32. Liquid injection port; 321. Guide section; 33. First annular groove; 34. Second annular portion; 35. Third annular portion; 4. Sealing column; 5. Upper plastic; 6. Sealing ring. DETAILED DESCRIPTION

[0037] In the following, only some exemplary embodiments are briefly described. As those skilled in the art will appreciate, the described embodiments may be modified in various ways without departing from the spirit or scope of the present application. Therefore, the drawings and descriptions are considered to be exemplary and non-restrictive in nature.

[0038] See also Figure 1-Figure 6 , shows a battery cover according to a preferred embodiment of the present invention, comprising:

[0039] The optical cover plate 1 has a pole hole 11 and a connection hole 12, and both the pole hole 11 and the connection hole 12 pass through the optical cover plate 1 from top to bottom;

[0040] A pole 2, the pole 2 is arranged in the pole hole 11;

[0041] The lower plastic 3 is disposed on the bottom of the optical cover 1. The lower plastic 3 is provided with a connecting portion 31. The connecting portion 31 is disposed in the connecting hole 12 to seal the connecting hole 12. The connecting portion 31 has a liquid injection port 32. The liquid injection port 32 passes through the lower plastic 3 from top to bottom; and

[0042] The sealing column 4 is inserted into the liquid injection port 32 , and the sealing column 4 and the liquid injection port 32 are interference fit to seal the liquid injection port 32 . When the pressure inside the power battery is greater than the ambient pressure, the sealing column 4 can be separated from the liquid injection port 32 under the action of the pressure difference.

[0043] The battery cover of the present invention has a certain elasticity. By providing a liquid injection port 32 on the lower plastic 3 and by interference fit between the sealing column 4 and the liquid injection port 32, a certain deformation and extrusion force can be generated on the lower plastic 3 or between the lower plastic 3 and the sealing column 4, ensuring that the sealing column 4 can be tightly connected to the lower plastic 3, and can effectively prevent the sealing column 4 from being separated from the lower plastic 3 when not affected by the pressure difference, thereby ensuring the sealing reliability. At the same time, it can also play the role of sealing the liquid injection port 32, without welding, and there will be no situation where the entire battery cover is scrapped due to welding quality problems. At the same time, due to the interference fit between the sealing column 4 and the injection port 32, when the pressure inside the power battery is greater than the ambient pressure, the sealing column 4 can be separated from the injection port 32 under the action of the pressure difference, so that the gas inside the power battery can be released to the outside through the injection port 32, thereby playing a pressure relief role. There is no need to set up an explosion-proof valve separately, which can simplify the processing technology of the battery cover and help reduce the cost of the battery cover. In addition, due to the interference fit between the sealing column 4 and the injection port 32, the pressure relief value can be adjusted by adjusting the interference fit degree between the sealing column 4 and the injection port 32, which is more flexible and convenient to use.

[0044] See also Figure 3 In one embodiment, the upper end of the liquid injection port 32 is a guide section 321, and the cross section of the guide section 321 gradually increases from bottom to top. In this way, the guide section 321 can be used to guide the sealing column 4 for installation, so that the sealing column 4 can be quickly installed on the liquid injection port 32, thereby improving the installation efficiency of the sealing column 4. At the same time, the setting of the guide section 321 can also guide the battery liquid, making the injection of the battery liquid smoother and more efficient.

[0045] In one embodiment, the sealing column 4 is made of stainless steel or brass, so that the sealing column 4 has excellent corrosion resistance and can continuously and reliably seal the liquid injection port 32 .

[0046] Of course, in other embodiments, the sealing column 4 may also be made of other hard and corrosion-resistant metal materials.

[0047] In one embodiment, the lower plastic 3 is integrally formed on the light cover 1 by injection molding, ensuring that the lower plastic 3 and the light cover 1 are tightly connected together, so that the lower plastic 3 is not easy to separate from the light cover 1, so that the sealing column 4 and the liquid injection port 32 can be reliably maintained in an interference fit state. At the same time, the lower plastic 3 and the light cover 1 are connected without connectors, which can further simplify the structure and assembly process of the battery cover, and help to further reduce the cost of the battery cover.

[0048] See also Figure 3 In one embodiment, the connecting hole 12 includes an upper hole section 121 and a lower hole section 122, and the aperture of the upper hole section 121 is larger than the aperture of the lower hole section 122;

[0049] The connecting portion 31 includes an upper connecting section 311 and a lower connecting section 312. The upper connecting section 311 is adapted to the upper hole section 121, and the lower connecting section 312 is adapted to the lower hole section 122. Since the aperture of the upper hole section 121 is larger than the aperture of the lower hole section 122, the connecting hole 12 is a stepped structure with a larger upper portion and a smaller lower portion. At the same time, since the upper connecting section 311 is adapted to the upper hole section 121 and the lower connecting section 312 is adapted to the lower hole section 122, the connecting portion 31 is also a stepped structure with a larger upper portion and a smaller lower portion, which can effectively limit the connecting portion 31 from being separated from the connecting hole 12, which is beneficial to further improve the tightness of the connection between the lower plastic 3 and the optical cover plate 1, and make the sealing column 4 and the liquid injection port 32 more reliably maintained in an interference fit state.

[0050] See also Figure 3 In one embodiment, the diameter of the upper hole section 121 gradually increases from bottom to top to further increase the contact area between the upper hole section 121 and the upper connecting section 311, so that the connection between the lower plastic 3 and the optical cover plate 1 is tighter.

[0051] See also Figure 3 In one embodiment, a first annular portion 13 is provided at the bottom of the optical cover 1, and the first annular portion 13 is arranged around the lower end of the connecting hole 12. The lower plastic 3 has a first annular groove 33, and the first annular groove 33 is adapted to the first annular portion 13 to increase the contact area between the optical cover 1 and the lower plastic 3, so that the connection between the lower plastic 3 and the optical cover 1 is tighter.

[0052] See also Figure 3 In one embodiment, the bottom of the optical cover 1 has a second annular groove 14, and the second annular groove 14 is arranged around the first annular portion 13. The lower plastic 3 has a second annular portion 34, and the second annular portion 34 is adapted to the second annular groove 14 to further increase the contact area between the optical cover 1 and the lower plastic 3, so that the connection between the lower plastic 3 and the optical cover 1 is tighter.

[0053] See also Figure 4 In one embodiment, the bottom of the optical cover plate 1 has a third annular groove 15, and the third annular groove 15 is arranged around the pole hole 11;

[0054] A convex ring 21 is provided at the lower part of the pole 2. The convex ring 21 is arranged around the axial center line of the pole 2, and the outer diameter of the convex ring 21 is larger than the aperture of the pole hole 11 and smaller than the groove width of the third annular groove 15;

[0055] The battery cover also includes:

[0056] The upper plastic 5 is disposed on the top of the light cover 1, and the upper plastic 5 is disposed around the pole 2. The upper plastic 5 is located between the outer peripheral wall of the light cover 1 and the pole 2, so as to insulate the light cover 1 and the pole 2, and at the same time, reliably connect the pole 2 and the light cover 1; and

[0057] The sealing ring 6 is sleeved on the pole 2, and the sealing ring 6 is sandwiched between the top wall of the convex ring 21 and the bottom wall of the third annular groove 15 to seal the gap between the pole 2 and the light cover plate 1, that is, to seal the pole hole 11. Among them, since the outer diameter of the convex ring 21 is larger than the aperture of the pole hole 11 and smaller than the groove width of the third annular groove 15, and at the same time, since the sealing ring 6 is sandwiched between the top wall of the convex ring 21 and the bottom wall of the third annular groove 15, the pole 2 can be effectively restricted from being separated from the pole hole 11, which is conducive to further improving the assembly stability of the pole 2 and the light cover plate 1.

[0058] See also Figure 4 In one embodiment, the lower plastic 3 is provided with a third annular portion 35, and the third annular portion 35 is arranged around the sealing ring 6. The third annular portion 35 is sandwiched between the bottom wall of the third annular groove 15 and the top wall of the convex ring 21 to further increase the contact area between the optical cover 1 and the lower plastic 3. At the same time, the third annular portion 35 can be sandwiched between the bottom wall of the third annular groove 15 and the top wall of the convex ring 21 to further strengthen the connection tightness between the lower plastic 3 and the optical cover 1, thereby greatly increasing the assembly stability of the lower plastic 3.

[0059] A preferred embodiment of the present invention provides a power battery, comprising the above-mentioned battery cover.

[0060] The power battery of the present invention, due to the adoption of the above-mentioned battery cover, can also play the role of sealing the liquid injection port 32, without the need for welding, and will not cause the entire battery cover to be scrapped due to welding quality problems. At the same time, when the pressure inside the power battery is greater than the ambient pressure, the sealing column 4 can be separated from the liquid injection port 32 under the action of the pressure difference, so that the gas inside the power battery can be released to the outside through the liquid injection port 32, thereby playing a pressure relief role, and there is no need to set up an explosion-proof valve separately.

[0061] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples described in this specification and the features of different embodiments or examples, unless they are contradictory.

[0062] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0063] The above are only specific implementations of the present application, but the protection scope of the present application is not limited thereto. Any technician familiar with the technical field can easily think of various changes or substitutions within the technical scope disclosed in the present application, which should be included in the protection scope of the present application. Therefore, the protection scope of the present application should be based on the protection scope of the claims.

Claims

1. A battery cover, characterized in that: include: A light cover plate, wherein the light cover plate has a pole hole and a connection hole, wherein both the pole hole and the connection hole penetrate the light cover plate from top to bottom; A pole, wherein the pole is arranged in the pole hole; A lower plastic, the lower plastic is disposed on the bottom of the optical cover, the lower plastic is provided with a connecting portion, the connecting portion is disposed in the connecting hole, the connecting portion has a liquid injection port, and the liquid injection port passes through the lower plastic both from top to bottom; and A sealing column is inserted into the liquid injection port, and the sealing column is interference fit with the liquid injection port to seal the liquid injection port. When the pressure inside the power battery is greater than the ambient pressure, the sealing column can be separated from the liquid injection port under the action of the pressure difference.

2. The battery cover according to claim 1, characterized in that: The upper end of the liquid injection port is a guide section, and the cross section of the guide section gradually increases from bottom to top.

3. The battery cover according to claim 1, characterized in that: The sealing column is a structure made of stainless steel or brass.

4. The battery cover according to claim 1, characterized in that: The lower plastic is integrally formed on the light cover plate by injection molding.

5. The battery cover according to claim 1, characterized in that: The connecting hole comprises an upper hole section and a lower hole section, and the hole diameter of the upper hole section is larger than the hole diameter of the lower hole section; The connecting portion includes an upper connecting section and a lower connecting section, wherein the upper connecting section is adapted to fit the upper hole section, and the lower connecting section is adapted to fit the lower hole section.

6. The battery cover according to claim 4, characterized in that: A first annular portion is provided at the bottom of the optical cover plate, and the first annular portion is arranged around the lower end of the connecting hole. The lower plastic has a first annular groove, and the first annular groove and the first annular portion are adapted.

7. The battery cover according to claim 6, characterized in that: The bottom of the optical cover plate has a second annular groove, the second annular groove is arranged around the first annular portion, the lower plastic has a second annular portion, and the second annular portion and the second annular groove are adapted.

8. The battery cover according to claim 1, characterized in that: The bottom of the optical cover plate has a third annular groove, and the third annular groove is arranged around the pole hole; A convex ring is provided at the lower part of the pole, the convex ring is arranged around the axial center line of the pole, and the outer diameter of the convex ring is larger than the hole diameter of the pole hole and smaller than the groove width of the third annular groove; The battery cover also includes: An upper plastic, the upper plastic being disposed on the top of the optical cover, the upper plastic being disposed around the pole, and the upper plastic being located between the optical cover and the outer peripheral wall of the pole; and A sealing ring is sleeved on the pole and clamped between the top wall of the convex ring and the bottom wall of the third annular groove.

9. The battery cover according to claim 8, characterized in that: The lower plastic is provided with a third annular portion, the third annular portion is arranged around the sealing ring, and the third annular portion is sandwiched between the bottom wall of the third annular groove and the top wall of the convex ring.

10. A power battery, characterized in that: A battery cover comprising the battery cover according to any one of claims 1 to 9.

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