Novel explosion-proof cover shell and battery cell

Abstract

The utility model relates to the technical field of battery cells, and provides a novel explosion-proof cover shell and a battery cell, each of the novel explosion-proof cover shell and the battery cell comprises a cover shell body, an explosion-proof valve plate body and a sealing cover plate; a mounting opening is concentrically formed in the center of the cover shell body; the explosion-proof valve plate body covers the mounting opening in a sealing manner, and a liquid injection hole is concentrically formed in the center of the explosion-proof valve plate body; the sealing cover sheet covers the liquid injection hole in a sealing manner; and the anti-explosion valve plate body can be broken to release pressure under the action of pressure on one side of the cover shell body. The novel explosion-proof cover shell and the battery cell both have the beneficial effects that the explosion-proof valve with a larger size can be arranged in a compatible manner, and a better pressure relief and explosion-proof effect is generated.

Description

Technical Field

[0001] The present disclosure relates to the field of battery cell technology, and in particular to a novel explosion-proof cover and battery cell. Background Art

[0002] In the prior art, batteries are generally equipped with explosion-proof pressure relief structures, such as Figure 1 As shown, in the prior art, the battery cell generally has an explosion-proof pressure relief vent 11 in the bottom cover plate 1 below itself, and an explosion-proof valve plate 111 is covered corresponding to the explosion-proof pressure relief vent. When the battery cell loses temperature due to heat, high-pressure gas will be generated inside the battery cell and break the explosion-proof valve plate 111, thereby opening the explosion-proof pressure relief vent 11 and timely venting and relieving the pressure inside the battery cell.

[0003] However, the explosion-proof valve plate 111 provided in the battery cell of the prior art also has certain defects in actual use. For example, since an injection hole is provided at the center of the bottom cover plate 1, the explosion-proof pressure relief vent 11 and the explosion-proof valve plate 111 can only be set eccentrically, which causes the explosion-proof pressure relief vent 11 to be blocked by the winding core part inside the battery cell, and the gas is not discharged smoothly during pressure relief, which is easy to cause blockage. In addition, due to the limitation of the injection hole, the maximum diameter of the explosion-proof pressure relief vent 11 will not exceed the radius of the bottom cover plate 1. Therefore, it will also affect the actual use requirements of rapid pressure relief to a certain extent.

[0004] Therefore, there is an urgent need on the market for a new type of explosion-proof cover for battery cells to solve the problems of limited maximum setting diameter and low pressure relief and exhaust efficiency of explosion-proof pressure relief vents of battery cells in the prior art. Utility Model Content

[0005] The embodiments of the present disclosure provide a novel explosion-proof cover and battery cell, in order to solve the problems of limited maximum setting diameter and low pressure relief and exhaust efficiency of the explosion-proof pressure relief vent of the battery cell in the prior art.

[0006] The novel explosion-proof cover provided by the embodiment of the present disclosure includes a cover body, an explosion-proof valve plate body and a sealing cover plate;

[0007] A mounting opening is concentrically opened at the center of the cover shell body;

[0008] The explosion-proof valve plate is sealed and covered on the installation opening, and a liquid injection hole is concentrically opened at the center of the explosion-proof valve plate;

[0009] The sealing cover is sealingly covered on the liquid injection hole;

[0010] Wherein, the explosion-proof valve plate can rupture and release pressure under the pressure of one side of the cover shell body.

[0011] In one embodiment, the periphery of the explosion-proof valve plate is correspondingly provided with an annular welding portion;

[0012] The explosion-proof valve plate body is welded to the mounting port through the annular welding portion.

[0013] In an embodiment, the diameter of the cover shell body is denoted as D, the diameter of the explosion-proof valve plate body is denoted as d, and 0.3D≤d≤0.7D is satisfied.

[0014] In an embodiment, the explosion-proof valve plate body is provided with a concave-convex structure portion.

[0015] The concave-convex structure portion is concentrically arranged around the outer peripheral portion of the liquid injection hole.

[0016] In an embodiment, the concave-convex structure portion includes a plurality of annular concave bodies and annular convex bodies which are concentrically and alternately arranged.

[0017] In an embodiment, the annular concave bodies and the annular convex bodies are integrally stamped and formed with the explosion-proof valve plate body.

[0018] And an inclined connecting body is arranged between adjacent annular concave bodies and annular convex bodies.

[0019] In an embodiment, the liquid injection hole is arranged as a stepped hole with an increasing diameter from inside to outside, and the sealing cover plate is flushly covered on the outer hole section of the stepped hole.

[0020] In an embodiment, the cover shell body is further provided with a lap joint edge extending towards the center of the mounting port.

[0021] The explosion-proof valve plate body is correspondingly sealed and covered on the mounting port through the lap joint edge.

[0022] In addition, the disclosure embodiments also provide an electric core including an internal winding core, an outer shell arranged on the outer peripheral portion of the internal winding core, and the new type of explosion-proof cover shell.

[0023] The cover shell body is correspondingly sealed and covered on the bottom end of the outer shell.

[0024] In an embodiment, the cover shell body is integrally formed and connected with the outer shell, or is separately formed and welded.

[0025] The technical solutions provided by the disclosure embodiments have the following advantages compared with the prior art:

[0026] The new explosion-proof cover provided by the disclosed embodiment can arrange the explosion-proof valve plate at the center of the cover body, thereby allowing the explosion-proof valve plate to be larger in size. Moreover, the injection hole in the explosion-proof valve plate can normally allow the battery cell to be normally filled with electrolyte, and the sealing cover plate can correspondingly seal the injection hole. Therefore, the new explosion-proof cover provided by the disclosed embodiment can not only provide explosion-proof protection for the battery cell, but also achieve a normal sealing function for the bottom of the battery cell. Therefore, the new explosion-proof cover has the beneficial effect of being compatible with the installation of a larger explosion-proof valve and producing a better pressure relief and explosion-proof effect.

[0027] In addition, the battery cell provided in the embodiment of the present disclosure, including the above-mentioned novel explosion-proof cover, can achieve the same beneficial effects as above, and will not be further elaborated here.

[0028] It should be understood that the contents described in this section are not intended to identify the key or important features of the embodiments of the present disclosure, nor are they intended to limit the scope of the present disclosure. Other features of the present disclosure will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] The above and other objects, features and advantages of the exemplary embodiments of the present disclosure will become readily understood by reading the detailed description below with reference to the accompanying drawings, in which several embodiments of the present disclosure are shown by way of example and not limitation, wherein:

[0030] In the drawings, the same or corresponding reference numerals denote the same or corresponding parts.

[0031] Figure 1 The figure shows a schematic structural diagram of a battery cell bottom cover in the prior art;

[0032] Figure 2 Shows a front view of a novel explosion-proof cover provided by an embodiment of the present disclosure;

[0033] Figure 3 A partial cross-sectional view of a battery cell provided by an embodiment of the present disclosure is shown.

[0034] Explanation of the numbers in the figure: 1, bottom cover; 11, explosion-proof pressure relief port; 111, explosion-proof valve plate;

[0035] 2. Cover shell body; 3. Explosion-proof valve plate body; 31. Liquid injection hole; 32. Annular welding part; 33. Concave-convex structure part; 331. Annular concave body; 332. Annular convex body; 333. Inclined connecting body; 4. Sealing cover plate; 5. Outer shell; 6. Internal winding core. DETAILED DESCRIPTION

[0036] To make the purposes, features, and advantages of the present disclosure more apparent and understandable, the technical solutions in the embodiments of the present disclosure will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present disclosure, not all of them. All other embodiments obtained by those skilled in the art based on the embodiments of the present disclosure without creative work shall fall within the scope of protection of the present disclosure.

[0037] The embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings.

[0038] Combine Figure 2 and Figure 3 As shown, the embodiment of the present disclosure provides a new explosion-proof cover shell, which includes a cover shell body 2, an explosion-proof valve plate body 3 and a sealing cover plate 4; a mounting port is concentrically opened at the center of the cover shell body 2; the explosion-proof valve plate body 3 is sealingly covered on the mounting port, and a liquid injection hole 31 is concentrically opened at the center of the explosion-proof valve plate body 3; the sealing cover plate 4 is sealingly covered on the liquid injection hole 31; wherein, the explosion-proof valve plate body 3 can rupture and release pressure under the action of pressure on one side of the cover shell body 2.

[0039] This new explosion-proof cover can be specifically used as the bottom cover of the battery cell. In actual use, the cover body 2 is first connected and set to the bottom of the battery cell, and then the explosion-proof valve plate 3 is sealed and covered on the installation port at the center of the cover body 2. The injection hole 31 at the center of the explosion-proof valve plate 3 can allow the battery cell to be normally filled with electrolyte, and after the filling is completed, it can be sealed and covered by the sealing cover plate 4.

[0040] Compared with the prior art method in which the explosion-proof valve is eccentrically set on the bottom cover plate of the battery cell, the new explosion-proof cover shell provided in the embodiment of the present disclosure can set the explosion-proof valve plate body 3 correspondingly at the center of the cover shell body 2, so that the explosion-proof valve plate body 3 can be set to a larger size, and the injection hole 31 in the explosion-proof valve plate body 3 can normally allow the battery cell to be normally filled with electrolyte, and the sealing cover plate 4 can seal and cover the injection hole 31 accordingly, so that the new explosion-proof cover shell provided in the embodiment of the present disclosure can not only realize the explosion-proof protection of the battery cell, but also realize the normal sealing and covering function of the bottom of the battery cell.

[0041] Therefore, the novel explosion-proof cover provided by the embodiment of the present disclosure has the advantage of being compatible with the installation of a larger-sized explosion-proof valve and producing a better pressure relief and explosion-proof effect.

[0042] In one embodiment, an annular welding portion 32 is correspondingly provided on the periphery of the explosion-proof valve disc 3 ; the explosion-proof valve disc 3 is surrounded and welded to the installation opening by the annular welding portion 32 .

[0043] Specific, combined Figure 2Further in detail, the annular welding portion 32 is arranged at the periphery of the explosion-proof valve piece 3, and the explosion-proof valve piece 3 surrounds the welding portion 32 to be welded to the mounting port, so that the explosion-proof valve piece 3 and the cover shell body 2 can be welded in advance, and the problem of low qualification rate of integrated machining of the explosion-proof valve and the battery shell is solved.

[0044] In an embodiment, the diameter of the cover shell body 2 is denoted as D, the diameter of the explosion-proof valve piece 3 is denoted as d, and 0.3D≤d≤0.7D is satisfied.

[0045] The diameter d of the explosion-proof valve piece 3 is specifically limited to 0.3-0.7 times the diameter D of the cover shell body 2, so that on the one hand, the influence of the explosion-proof valve piece 3 being too small on the pressure relief explosion-proof effect can be avoided, and on the other hand, the influence of the explosion-proof valve piece 3 being too large on the reliability of the cover shell body 2 covering the bottom of the battery can be avoided.

[0046] In an embodiment, the explosion-proof valve piece 3 is provided with a concave-convex structure portion 33; the concave-convex structure portion 33 concentrically surrounds the outer periphery of the liquid injection hole 31.

[0047] Specifically, in combination with Figure 3 Further in detail, the concave-convex structure portion 33 is further arranged in the explosion-proof valve piece 3, and the concave-convex structure portion 33 concentrically surrounds the outer periphery of the liquid injection hole 31, so that when the explosion-proof valve piece 3 is subjected to the pressure of the battery, the concave-convex structure portion 33 will first bulge outward under the action of the pressure, so that the explosion-proof valve piece 3 has better ductility, and when the concave-convex structure portion 33 bulges outward, the explosion-proof valve piece 3 is further subjected to the pressure of the battery, at this time, the annular concave-convex structure portion 33 is further pressed to generate an annular crack, and finally an annular crack is formed in the concave-convex structure portion 33, at this time, the liquid injection hole 31 and the sealing cover piece 4 concentrically arranged in the concave-convex structure portion 33 can be separated together, so that a very large diameter pressure relief port is formed at the center of the explosion-proof valve piece 3, so that the battery can be quickly and efficiently relieved and vented.

[0048] The specific arrangement of the concave-convex structure portion 33 can improve the local structure ductility of the explosion-proof valve piece 3, so that the explosion-proof valve piece 3 can form a larger pressure relief port when it is broken.

[0049] In an embodiment, the concave-convex structure portion 33 includes a plurality of annular concave bodies 331 and annular convex bodies 332 which are concentrically and alternately arranged.

[0050] Specifically, in combination with Figure 3To further explain in detail, the concave-convex structure portion 33 is specifically arranged as a plurality of concentric and mutually staggered annular recessed bodies 331 and annular protrusions 332. In this way, when the explosion-proof valve sheet body 3 is initially subjected to the pressure inside the battery cell, the annular recessed bodies 331 and the annular protrusions 332 can both expand and deform under the action of air pressure, thereby further improving the local structural ductility and initial pressure-bearing performance of the explosion-proof valve sheet body 3.

[0051] In one embodiment, the annular recessed body 331 and the annular protruding body 332 are integrally stamped and formed with the explosion-proof valve plate 3 ; and an inclined connecting body 333 is provided between adjacent annular recessed bodies 331 and annular protruding bodies 332 .

[0052] Specific, combined Figure 3 To further explain in detail, the annular recessed body 331 and the annular protrusion 332 are stamped integrally with the explosion-proof valve sheet body 3, so that the annular recessed body 331 and the annular protrusion 332 can be manufactured simultaneously during the processing and manufacturing of the explosion-proof valve sheet body 3, and an inclined connector 333 is provided between adjacent annular recessed bodies 331 and annular protrusions 332, so that the inclined connector 333 can also be manufactured synchronously during the integral stamping, and the actual thickness of the inclined connector 333 can be set to be smaller than the thickness of the annular recessed body 331 and the annular protrusion 332, so that when the explosion-proof valve sheet body 3 is broken, the annular inclined connector 333 can be broken and peeled off first.

[0053] In one embodiment, the liquid injection hole 31 is configured as a stepped hole with a diameter increasing from the inside to the outside, and the sealing cover plate 4 is flush with the outer hole section of the stepped hole.

[0054] Specific, combined Figure 3 To further explain in detail, the injection hole 31 is set as a stepped hole with an increasing diameter from the inside to the outside, and the sealing cover plate 4 is flush with the outer hole section of the stepped hole, so that the inner hole section of the stepped hole can provide a certain support for the sealing cover plate 4, ensuring that the sealing cover plate 4 is firmly installed on the injection hole 31.

[0055] The sealing cover 4 and the outer hole section of the liquid injection hole 31 can be specifically set to a transition fit or an interference fit, and the sealing cover 4 can be sealed and flush with the outer hole section of the liquid injection hole 31 by, but not limited to, gluing, welding, etc.

[0056] In one embodiment, the cover shell body 2 is further provided with an overlapping edge extending toward the center of the installation opening; the explosion-proof valve plate 3 is sealed and covered on the installation opening via the overlapping edge.

[0057] Specific, combined Figure 3To further explain in detail, a lap edge extending toward the center of the mounting port is provided in the cover shell body 2, so that the explosion-proof valve plate body 3 is covered on the mounting port through the corresponding lap edge, and the annular welding portion 32 of the explosion-proof valve plate body 3 can be specifically welded to the lap edge to ensure that the explosion-proof valve plate body 3 and the mounting port of the cover shell body 2 are fully sealed and docked in the circumferential direction.

[0058] In addition, the embodiment of the present disclosure also provides a battery cell, which includes an internal winding core 6, an outer shell 5 sleeved on the outer periphery of the internal winding core 6, and the above-mentioned new explosion-proof cover shell; wherein, the cover shell body 2 corresponds to the sealing cover on the bottom end of the outer shell 5.

[0059] Specific, combined Figure 3 To further explain in detail, the battery cell includes the above-mentioned new explosion-proof cover shell, and the cover shell body 2 in the above-mentioned new explosion-proof cover shell is correspondingly sealed on the bottom end of the outer shell 5, so that the explosion-proof valve sheet body 3 in the mounting opening at the center of the cover shell body 2 can play a role in explosion-proof pressure relief protection for the battery cell, and the liquid injection hole 31 in the explosion-proof valve sheet body 3 and the sealing cover sheet 4 in the liquid injection hole 31 can ensure that the battery cell can normally perform the function of adding electrolyte.

[0060] The battery cell includes the above-mentioned novel explosion-proof cover shell, which can achieve all the beneficial effects of the above-mentioned novel explosion-proof cover shell, and will not be further elaborated here.

[0061] In one embodiment, the cover shell body 2 and the outer shell 5 are integrally formed and connected, or separately formed and welded.

[0062] Specific, combined Figure 3 To further explain in detail, when the cover shell body 2 and the outer shell 5 are integrally formed and connected, this can simplify the processing and manufacturing process and ensure the structural firmness of the connection between the cover shell body 2 and the outer shell 5; when the cover shell body 2 and the outer shell 5 are separately formed and welded, the cover shell body 2 and the outer shell 5 can be processed and manufactured separately, thereby improving the product preparation yield.

[0063] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features being referred to. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one such feature. Throughout the present disclosure, "plurality" means two or more, unless otherwise specifically defined.

[0064] The above description is merely a specific embodiment of the present disclosure, but the scope of protection of the present disclosure is not limited thereto. Any changes or substitutions that can be easily conceived by a person skilled in the art within the technical scope disclosed in this disclosure should be included in the scope of protection of the present disclosure. Therefore, the scope of protection of the present disclosure should be based on the scope of protection of the claims.

Claims

1. A new explosion-proof cover, characterized in that: include: A cover shell body (2), wherein a mounting opening is concentrically provided at the center of the cover shell body (2); An explosion-proof valve plate (3) has a sealing cover which is fitted on the mounting opening, and a liquid injection hole (31) is concentrically provided at the center of the explosion-proof valve plate (3); A sealing cover (4) sealingly covers the liquid injection hole (31); The explosion-proof valve plate (3) can rupture and release pressure under the action of pressure on one side of the cover shell body (2).

2. The new explosion-proof cover according to claim 1 is characterized in that: The periphery of the explosion-proof valve plate (3) is correspondingly provided with an annular welding portion (32); The explosion-proof valve plate (3) is surrounded and welded to the installation opening via the annular welding portion (32).

3. The new explosion-proof cover according to claim 1 is characterized in that: The diameter of the cover shell body (2) is recorded as D, and the diameter of the explosion-proof valve plate body (3) is recorded as d, and they satisfy 0.3D≤d≤0.7D.

4. The new explosion-proof cover according to claim 1 is characterized in that: The explosion-proof valve plate (3) is provided with a concave-convex structure portion (33); The concave-convex structure portion (33) concentrically surrounds the outer periphery of the liquid injection hole (31).

5. The new explosion-proof cover according to claim 4 is characterized in that: The concave-convex structure portion (33) comprises a plurality of annular recessed bodies (331) and annular convex bodies (332) that are concentric and interlaced with each other.

6. The novel explosion-proof cover according to claim 5 is characterized in that: The annular concave body (331) and the annular convex body (332) are integrally stamped and formed with the explosion-proof valve plate body (3); An inclined connecting body (333) is provided between adjacent annular recessed bodies (331) and adjacent annular protruding bodies (332).

7. The new explosion-proof cover according to claim 4 is characterized in that: The injection hole (31) is configured as a stepped hole with a diameter increasing from the inside to the outside, and the sealing cover plate (4) is flush with the outer hole section of the stepped hole.

8. The novel explosion-proof cover according to any one of claims 1 to 7, characterized in that: The cover shell body (2) is also provided with a lap edge extending toward the center of the installation opening; The explosion-proof valve plate (3) is covered on the installation opening via the corresponding sealing cover along the overlapped edge.

9. A battery cell, characterized in that: include: An internal winding core (6), an outer shell (5) sleeved on the outer periphery of the internal winding core (6), and a novel explosion-proof cover according to any one of claims 1 to 8; The cover shell body (2) is correspondingly sealed to the bottom end of the outer shell (5).

10. The battery cell according to claim 9, characterized in that: The cover shell body (2) and the outer shell (5) are integrally formed and connected, or separately formed and welded.

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