Anti-explosion valve structure, battery cover plate and battery

Abstract

The utility model discloses an explosion-proof valve structure, battery cover plate and battery, the explosion-proof valve structure is used for the battery cover plate, the battery cover plate is provided with a mounting hole, a spacing mounting surface and an annular groove which are spaced are formed on the inner peripheral wall of the mounting hole, and the projection of the spacing mounting surface is located in the projection of the annular groove in a projection plane parallel to the battery cover plate. The anti-explosion valve structure comprises an anti-explosion valve and an elastic piece, and the anti-explosion valve is located in the mounting hole; the elastic piece is detachably installed in the annular groove, and part of the elastic piece extends out of the annular groove to abut against the anti-explosion valve and is used for fixing the anti-explosion valve to the limiting installation face. According to the anti-explosion valve structure disclosed by the utility model, the anti-explosion valve and the elastic piece are detachably connected with the battery cover plate, the anti-explosion valve is fixed on the limiting mounting surface through the elastic piece, and when the anti-explosion valve is damaged, the anti-explosion valve can be replaced by detaching the elastic piece, so that the production cost of the battery is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of batteries, in particular to an explosion-proof valve structure, a battery cover and a battery. Background Art

[0002] In the related art, the explosion-proof valve of lithium batteries is fixed on the battery cover by welding and integral molding, which is a disposable explosion-proof valve. The explosion-proof valve is easily damaged by bumps during the battery manufacturing process, resulting in a defective explosion-proof valve. A defective explosion-proof valve makes the entire battery unusable, making the battery production cost higher. Utility Model Content

[0003] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, one purpose of the utility model is to provide an explosion-proof valve structure, in which the explosion-proof valve is fixed to the limit mounting surface by an elastic member, and when the explosion-proof valve is damaged, the explosion-proof valve can be replaced by removing the elastic member, so as to reduce the production cost of the battery.

[0004] The utility model also provides a battery cover plate with the explosion-proof valve structure.

[0005] The utility model also provides a battery with the battery cover plate.

[0006] According to the explosion-proof valve structure of the first aspect of the utility model, the battery cover has a mounting hole, and the inner peripheral wall of the mounting hole is formed with a spaced-apart limiting mounting surface and an annular groove. In a projection plane parallel to the battery cover, the projection of the limiting mounting surface is located within the projection of the annular groove. The explosion-proof valve structure comprises: an explosion-proof valve, which is located in the mounting hole; and an elastic member, which is detachably mounted in the annular groove, and part of the elastic member extends out from the annular groove to abut against the explosion-proof valve, so as to fix the explosion-proof valve on the limiting mounting surface.

[0007] According to the explosion-proof valve structure of the embodiment of the utility model, the explosion-proof valve and the elastic member are detachably connected to the battery cover, and the explosion-proof valve is fixed to the limiting mounting surface by the elastic member. When the explosion-proof valve is damaged, the explosion-proof valve can be replaced by removing the elastic member to reduce the production cost of the battery.

[0008] According to some embodiments of the utility model, the mounting hole is formed as a stepped hole and includes a first hole segment and a second hole segment, the first hole segment is located axially outside the second hole segment, the cross-sectional area of ​​the first hole segment is larger than the cross-sectional area of ​​the second hole segment, the step surface formed between the first hole segment and the second hole segment constitutes the limiting mounting surface, and the annular groove is formed in the first hole segment.

[0009] According to some embodiments of the present invention, the elastic member is an annular ring with two ends not closed, so as to define a gap between the two ends of the annular ring.

[0010] According to some embodiments of the utility model, a first clamping hole and a second clamping hole are respectively provided on the annular ring at both ends of the notch, and a clamping tool is suitable for cooperating with the first clamping hole and the second clamping hole to disassemble and assemble the annular ring.

[0011] According to some embodiments of the utility model, the annular ring includes a retaining ring body and a first end and a second end connected to both ends of the retaining ring body, the first end and the second end define the notch, the first end is provided with the first clamping hole, the second end is provided with the second clamping hole, and the widths of the first end and the second end are both greater than the width of the retaining ring body.

[0012] According to some embodiments of the present invention, a sealing ring is further included, and the sealing ring is installed between the explosion-proof valve and the limiting installation surface.

[0013] According to some embodiments of the present utility model, the explosion-proof valve includes an explosion-proof part and a mounting part, the mounting part surrounds the outer peripheral side of the explosion-proof part, the mounting part is located on the limiting mounting surface, and the elastic member abuts against the mounting part for fixing the mounting part on the limiting mounting surface.

[0014] According to some embodiments of the present invention, the elastic member is an integrally formed steel member.

[0015] The battery cover according to the second aspect of the present invention includes: the explosion-proof valve structure according to the first aspect of the present invention.

[0016] According to the battery cover of the embodiment of the utility model, the explosion-proof valve structure is provided, and the explosion-proof valve is provided as a detachable structure. When the explosion-proof valve is damaged, the explosion-proof valve can be replaced by removing the elastic member, so as to reduce the production cost of the battery.

[0017] A battery according to an embodiment of the third aspect of the utility model includes: a battery cover according to an embodiment of the second aspect of the utility model.

[0018] According to the battery of the embodiment of the utility model, the explosion-proof valve is set as a detachable structure by providing the battery cover. When the explosion-proof valve is damaged, the explosion-proof valve can be replaced by removing the elastic member, thereby reducing the production cost of the battery.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1 is an exploded view of a battery cover according to some embodiments of the utility model;

[0022] Figure 2 yes Figure 1 A top view of the middle battery cover;

[0023] Figure 3 yes Figure 2 Sectional view along line AA;

[0024] Figure 4 yes Figure 3 The enlarged view of point B in the middle;

[0025] Figure 5 yes Figure 1 A top view of the middle cover body;

[0026] Figure 6 yes Figure 5 Sectional view along line CC;

[0027] Figure 7 yes Figure 6 The enlarged view of point D in the middle;

[0028] Figure 8 is a stereogram of an annular ring according to some embodiments of the utility model;

[0029] Fig. 9 yes Figure 8 Schematic diagram of the middle annular ring;

[0030] Fig.10 It is a schematic diagram of a sealing ring according to some embodiments of the utility model.

[0031] Reference numerals:

[0032] 100, battery cover; 101, cover body; 102, lower plastic part; 1021, vent hole;

[0033] 10. mounting hole; 11. first hole section; 12. second hole section; 13. position limiting mounting surface; 14. annular groove;

[0034] 20. Explosion-proof valve structure; 2. Explosion-proof valve; 21. Explosion-proof part; 22. Mounting part; 3. Elastic member; 31. Annular ring; 311. Retaining ring body; 312. First end; 3121. First clamping hole; 313. Second end; 3131. Second clamping hole; 314. Notch; 4. Sealing ring; 5. Protective patch. DETAILED DESCRIPTION

[0035] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0036] In the description of the present utility model, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as a limitation on the present utility model. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present utility model, the meaning of "multiple" is two or more, unless otherwise clearly and specifically defined.

[0037] In the description of the present utility model, it should be noted that, unless otherwise clearly specified and limited, the terms "installation", "connection" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in the present utility model can be understood according to specific circumstances.

[0038] Reference below Figure 1-Figure 10 The explosion-proof valve structure 20 according to the embodiment of the present invention is described.

[0039] According to the explosion-proof valve structure 20 of the embodiment of the first aspect of the utility model, the explosion-proof valve structure 20 is used for the battery cover 100, the battery cover 100 has a mounting hole 10, the battery cover 100 includes a cover body 101 and a lower plastic part 102, the lower plastic part 102 is located on the side of the cover body 101 close to the pole group, the cover body 101 has a mounting hole 10, the lower plastic part 102 has a vent hole 1021 connected to the mounting hole 10, and the mounting hole 10 passes through the cover body 101 along the thickness direction of the cover body 101.

[0040] The inner circumferential wall of the mounting hole 10 is formed with a spaced-apart limiting mounting surface 13 and an annular groove 14. The annular groove 14 is the inner circumferential wall of the mounting hole 10 which is recessed toward a side away from the center of the mounting hole 10. In a projection plane parallel to the battery cover 100, the projection of the limiting mounting surface 13 is located within the projection of the annular groove 14, that is, the cross-sectional area of ​​the annular groove 14 is greater than the area of ​​the limiting mounting surface 13.

[0041] The explosion-proof valve structure 20 includes an explosion-proof valve 2 and an elastic member 3. The explosion-proof valve 2 is installed in the mounting hole 10. The elastic member 3 is detachably installed in the annular groove 14, and part of the elastic member 3 extends from the annular groove 14 to abut against the explosion-proof valve 2, which is used to fix the explosion-proof valve 2 on the limiting mounting surface 13. The elastic member 3 has an elastic force, and the elastic force can fix the explosion-proof valve 2 on the limiting mounting surface 13. The annular groove 14 can provide an installation position for the elastic member 3, and the elastic member 3 can be removed from the annular groove 14. The explosion-proof valve structure 20 also includes a protective patch 5, which is arranged on the side of the battery cover 100 away from the pole group. The protective patch 5 is arranged opposite to the explosion-proof valve 2, and is used to protect the explosion-proof valve 2 and prevent moisture, dust or other debris in the external environment from entering the explosion-proof valve 2.

[0042] The explosion-proof valve 2 is fixed on the limiting mounting surface 13 under the action of the elastic force of the elastic member 3. When the battery cover 100 expands or contracts with heat or cold, the explosion-proof valve 2 and the elastic member 3 are detachably connected to the battery cover 100. The force of the battery cover 100 will not act on the explosion-proof valve 2, thereby improving the safety of the explosion-proof valve 2. The elastic member 3 will also expand or contract with the thermal expansion or contraction of the battery cover 100. The elastic force of the elastic member 3 will act on the explosion-proof valve 2, thereby improving the reliability of the installation of the explosion-proof valve 2.

[0043] In the related art, the explosion-proof valve 2 is fixed to the battery cover 100 by welding. When the explosion-proof valve 2 is installed, the explosion-proof valve 2 is easily damaged by bumps. The explosion-proof valve 2 is a disposable structure. After the explosion-proof valve 2 is damaged, it cannot be repaired, resulting in the battery being unusable. Moreover, the explosion-proof valve 2 is welded to the battery cover 100 and cannot be replaced, resulting in a high production cost of the battery.

[0044] In the present application, the explosion-proof valve 2 is fixed to the limiting mounting surface 13 by an elastic member 3. The elastic member 3 is a detachable structure. When the explosion-proof valve 2 is bumped, the elastic member 3 can be removed from the annular groove 14. The explosion-proof valve 2 is no longer restricted by the positioning. The explosion-proof valve 2 can be taken out from the mounting hole 10, which can facilitate the replacement of the explosion-proof valve 2.

[0045] When the battery has thermal runaway, the high-temperature gas generated in the battery is released through the explosion-proof valve 2. The explosion-proof valve 2 is a disposable structure. After the explosion-proof valve 2 releases the high-temperature gas, the explosion-proof valve 2 is irreversibly damaged. The elastic member 3 is removed from the annular groove 14, and the explosion-proof valve 2 is no longer restricted by the positioning. The explosion-proof valve 2 can be taken out from the mounting hole 10, and a new explosion-proof valve 2 can be replaced. The battery cover 100 can be recycled again.

[0046] According to the explosion-proof valve structure 20 of the embodiment of the utility model, the explosion-proof valve 2 and the elastic member 3 are detachably connected to the battery cover 100, and the explosion-proof valve 2 is fixed to the limiting mounting surface 13 by the elastic member 3. When the explosion-proof valve 2 is damaged, the explosion-proof valve 2 can be replaced by removing the elastic member 3 to reduce the production cost of the battery.

[0047] According to some embodiments of the present invention, referring to Figure 1-Figure 7 The mounting hole 10 is formed as a stepped hole, and the mounting hole 10 includes a first hole segment 11 and a second hole segment 12, the first hole segment 11 is located axially outside the second hole segment 12 (the axial outside is the first hole segment 11 located on the side of the second hole segment 12 away from the battery center), the cross-sectional area of ​​the first hole segment 11 is greater than the cross-sectional area of ​​the second hole segment 12, the stepped surface formed between the first hole segment 11 and the second hole segment 12 constitutes a limiting mounting surface 13, and an annular groove 14 is formed in the first hole segment 11.

[0048] The elastic member 3 is located on the outside of the explosion-proof valve 2. When replacing the explosion-proof valve 2, the elastic member 3 is taken out from the annular groove 14, and then the explosion-proof valve 2 is taken out. Since the first hole segment 11 is located on the side of the second hole segment 12 away from the pole group, and the cross-sectional area of ​​the first hole segment 11 is larger than the cross-sectional area of ​​the second hole segment 12, the explosion-proof valve 2 is located on the step surface formed between the first hole segment 11 and the second hole segment 12. The explosion-proof valve 2 can be placed on the limiting mounting surface 13 from the outside of the battery cover 100, and then the elastic member 3 is fixed to the annular groove 14.

[0049] According to some embodiments of the present invention, referring to Figure 1-Figure 9 The elastic member 3 is an annular ring 31 with two ends not closed, so as to define a gap 314 between the two ends of the annular ring 31. When the annular ring 31 is installed, since the annular ring 31 has the gap 314, the two ends of the annular ring 31 can approach each other in the direction of the gap 314, and the annular ring 31 can shrink. Since the cross-sectional area of ​​the annular groove 14 is larger than the cross-sectional area of ​​the mounting hole 10, shrinking the annular ring 31 can facilitate the annular ring 31 to be placed in the mounting hole 10. When the annular ring 31 is placed in the annular groove 14, the annular ring 31 can rebound under the action of its own elastic force, that is, the annular ring 31 can be fixed in the annular groove 14.

[0050] According to some embodiments of the present invention, referring to Figure 1-Figure 9 The annular ring 31 at both ends of the notch 314 is provided with a first clamping hole 3121 and a second clamping hole 3131, respectively. The clamping tool is suitable for cooperating with the first clamping hole 3121 and the second clamping hole 3131 to disassemble and assemble the annular ring 31. The clamping tool can extend into the first clamping hole 3121 and the second clamping hole 3131, and act on the first clamping hole 3121 and the second clamping hole 3131, so that the annular rings 31 at both ends of the notch 314 move in a direction of approaching each other, so as to quickly shrink the annular ring 31. For example, the clamping tool can be a pliers.

[0051] According to some embodiments of the present invention, referring to Figure 1-Figure 9 The annular ring 31 includes a retaining ring body 311, a first end 312 and a second end 313. The first end 312 and the second end 313 are respectively connected to the two ends of the retaining ring body 311, and the first end 312 and the second end 313 define a notch 314. A first clamping hole 3121 is provided on the first end 312, and a second clamping hole 3131 is provided on the second end 313. The widths of the first end 312 and the second end 313 are both greater than the width of the retaining ring body 311, which can facilitate the arrangement of the first clamping hole 3121 and the second clamping hole 3131.

[0052] According to some embodiments of the present invention, referring to Figure 1-Figure 4 , Fig.10 The explosion-proof valve structure 20 also includes a sealing ring 4, which is installed between the explosion-proof valve 2 and the limiting mounting surface 13. The sealing ring 4 is used to seal the assembly gap between the explosion-proof valve 2 and the limiting mounting surface 13, and is used to improve the sealing of the explosion-proof valve 2 installed on the battery cover 100.

[0053] According to some embodiments of the present invention, referring to Figure 1-Figure 4 The explosion-proof valve 2 includes an explosion-proof portion 21 and a mounting portion 22. The mounting portion 22 surrounds the outer peripheral side of the explosion-proof portion 21. The mounting portion 22 is located on the position-limiting mounting surface 13. The elastic member 3 abuts against the mounting portion 22 to fix the mounting portion 22 on the position-limiting mounting surface 13, which is convenient for the installation of the explosion-proof valve 2. The explosion-proof portion 21 is connected to the mounting hole 10. The elastic member 3 and the position-limiting mounting surface 13 do not cover the explosion-proof portion 21, which can increase the communication area between the explosion-proof portion 21 and the mounting hole 10. When the battery has thermal runaway, more high-temperature gas in the battery can impact the explosion-proof portion 21 through the mounting hole 10, so that the explosion-proof valve 2 can quickly release pressure.

[0054] According to some embodiments of the present invention, referring to Figure 1-Figure 9The elastic member 3 is an integrally formed steel member, which can improve the structural strength of the elastic member 3. For example, the elastic member 3 can be integrally stamped from a steel material. The elastic member 3 is a steel member, which can improve the elastic force of the elastic member 3. In the long-term use of the battery, the elastic force of the elastic member 3 is not easy to fail, which can improve the reliability of the elastic member 3 fixing the explosion-proof valve 2.

[0055] The battery cover 100 according to the second embodiment of the utility model includes: the explosion-proof valve structure 20 according to the first embodiment of the utility model.

[0056] According to the battery cover 100 of the embodiment of the utility model, the explosion-proof valve 2 is set as a detachable structure by setting the above-mentioned explosion-proof valve structure 20. When the explosion-proof valve 2 is damaged, the explosion-proof valve 2 can be replaced by removing the elastic member 3 to reduce the production cost of the battery.

[0057] A battery according to an embodiment of the third aspect of the utility model includes: a battery cover 100 according to the embodiment of the second aspect of the utility model.

[0058] According to the battery of the embodiment of the utility model, the explosion-proof valve 2 is set as a detachable structure by setting the above-mentioned battery cover 100. When the explosion-proof valve 2 is damaged, the explosion-proof valve 2 can be replaced by removing the elastic member 3, so as to reduce the production cost of the battery.

[0059] In the description of this specification, the description with reference to the terms "some embodiments", "optionally", "further" or "some examples" etc. 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 utility model. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0060] Although the embodiments of the present invention have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the claims and their equivalents.

Claims

1. An explosion-proof valve structure, used for a battery cover, characterized in that: The battery cover has a mounting hole, and the inner peripheral wall of the mounting hole is formed with a spaced-apart limiting mounting surface and an annular groove, and in a projection plane parallel to the battery cover, the projection of the limiting mounting surface is located within the projection of the annular groove, and the explosion-proof valve structure includes: An explosion-proof valve, wherein the explosion-proof valve is located in the mounting hole; An elastic member is detachably mounted in the annular groove, and a portion of the elastic member extends out from the annular groove to abut against the explosion-proof valve, so as to fix the explosion-proof valve on the limiting mounting surface.

2. The explosion-proof valve structure according to claim 1, characterized in that: The mounting hole is formed as a stepped hole and includes a first hole segment and a second hole segment, the first hole segment is located axially outside the second hole segment, the cross-sectional area of ​​the first hole segment is larger than the cross-sectional area of ​​the second hole segment, the stepped surface formed between the first hole segment and the second hole segment constitutes the limiting mounting surface, and the annular groove is formed in the first hole segment.

3. The explosion-proof valve structure according to claim 1, characterized in that: The elastic member is an annular ring with two ends not closed, so as to define a gap between the two ends of the annular ring.

4. The explosion-proof valve structure according to claim 3, characterized in that: A first clamping hole and a second clamping hole are respectively provided on the annular ring at both ends of the notch, and a clamping tool is suitable for cooperating with the first clamping hole and the second clamping hole to disassemble and assemble the annular ring.

5. The explosion-proof valve structure according to claim 4, characterized in that: The annular ring includes a retaining ring body and a first end and a second end connected to both ends of the retaining ring body, the first end and the second end define the notch, the first end is provided with the first clamping hole, the second end is provided with the second clamping hole, and the widths of the first end and the second end are both greater than the width of the retaining ring body.

6. The explosion-proof valve structure according to claim 1, characterized in that: It also includes a sealing ring, which is installed between the explosion-proof valve and the limiting installation surface.

7. The explosion-proof valve structure according to claim 1, characterized in that: The explosion-proof valve includes an explosion-proof portion and a mounting portion, wherein the mounting portion surrounds the outer peripheral side of the explosion-proof portion, the mounting portion is located on the position-limiting mounting surface, and the elastic member abuts against the mounting portion to fix the mounting portion on the position-limiting mounting surface.

8. The explosion-proof valve structure according to claim 1, characterized in that: The elastic member is an integrally formed steel member.

9. A battery cover, characterized in that: include: An explosion-proof valve structure according to any one of claims 1 to 8.

10. A battery, characterized in that: include: The battery cover according to claim 9.

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