Explosion-proof valve structure, battery monomer and battery

Abstract

The utility model discloses an explosion-proof valve structure, a battery monomer and a battery, the explosion-proof valve structure is used for the battery monomer, the battery monomer comprises a shell, the shell is provided with an explosion-proof hole, the explosion-proof valve structure comprises an explosion-proof valve and a reinforcing plate, and the explosion-proof valve is positioned in the explosion-proof hole; the reinforcing plate is located on the outer side of the shell and provided with an avoiding hole communicating with the anti-explosion valve. According to the anti-explosion valve structure, the reinforcing plate is arranged on the outer side of the shell, the reinforcing plate is provided with the receding hole communicated with the anti-explosion valve, and the reinforcing plate is used for improving the structural strength of the anti-explosion valve area, so that the stability of the anti-explosion valve is improved; meanwhile, when thermal runaway of the single battery occurs, high-temperature gas can be discharged in time through the anti-explosion valve and the avoiding hole, so that the safety of the single battery is improved.

Description

Technical Field

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

[0002] In related technologies, as the energy density requirements for lithium batteries become increasingly higher, the structural parts and other components of the battery are required to occupy as little limited space as possible, and structural parts such as cover plates and shells are gradually becoming lighter and thinner; however, as the cover plates and shells become lighter and thinner, the structural strength of the structural parts will also be reduced, and the ability to resist bending deformation will be reduced; for explosion-proof valves, they are usually welded to the cover plates or shells. The cover plates or shells serve as the carriers of the explosion-proof valves, which directly affect the structural stability of the explosion-proof valves. The lighter and thinner cover plates and shells will lead to a decrease in the structural stability of the explosion-proof valves. Utility Model Content

[0003] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, one object of the present invention is to provide an explosion-proof valve structure having a reinforcement plate provided on the outer side of the housing to increase the structural strength of the explosion-proof valve area, thereby improving the stability of the explosion-proof valve.

[0004] The utility model also provides a battery monomer having the explosion-proof valve structure.

[0005] The utility model also provides a battery having the battery monomer.

[0006] According to the explosion-proof valve structure of the first embodiment of the present invention, which is used for a battery cell, the battery cell includes a shell, the shell has an explosion-proof hole, and the explosion-proof valve structure includes: an explosion-proof valve, the explosion-proof valve is located in the explosion-proof hole; and a reinforcement plate, the reinforcement plate is located on the outside of the shell, and the reinforcement plate has an avoidance hole connected to the explosion-proof valve.

[0007] According to the explosion-proof valve structure of the embodiment of the present invention, a reinforcement plate is provided on the outer side of the shell, and the reinforcement plate has an avoidance hole connected to the explosion-proof valve. The reinforcement plate is used to increase the structural strength of the explosion-proof valve area, thereby improving the stability of the explosion-proof valve; at the same time, when thermal runaway occurs in the battery cell, the high-temperature gas can be discharged in time through the explosion-proof valve and the avoidance hole, thereby improving the safety of the battery cell.

[0008] According to some embodiments of the present invention, in a projection plane parallel to the reinforcing plate, the projection of the explosion-proof hole is located within the projection of the avoidance hole.

[0009] According to some embodiments of the present invention, the side of the reinforcing plate facing away from the shell has an annular rib and a plurality of reinforcing ribs arranged at intervals, and the annular rib is arranged around the avoidance hole.

[0010] According to some embodiments of the present invention, the plurality of reinforcing ribs are symmetrically arranged on both sides of the avoidance hole in the first direction.

[0011] According to some embodiments of the present invention, the height of the annular rib along the second direction is H1, satisfying: 0.01mm≤H1≤20mm; and / or the height of the reinforcing rib along the second direction is H2, satisfying: 0.01mm≤H2≤20mm.

[0012] According to some embodiments of the present invention, the corners of the reinforcing plate are arc-shaped transitions.

[0013] According to some embodiments of the present invention, the thickness of the reinforcing plate along the second direction is D, which satisfies: 0.01 mm ≤ D ≤ 20 mm.

[0014] According to some embodiments of the present invention, the reinforcing plate includes at least one plate body, and a plurality of the plate bodies are stacked on each other along a thickness direction of the plate body.

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

[0016] According to the battery cell of the embodiment of the present invention, by providing the above-mentioned explosion-proof valve structure, not only the structural strength of the explosion-proof valve area can be increased, but also the stability of the explosion-proof valve can be improved; when thermal runaway occurs in the battery cell, the high-temperature gas can also be discharged in time through the explosion-proof valve and the avoidance hole, thereby improving the safety of the battery cell.

[0017] The battery according to the embodiment of the third aspect of the present invention includes: the battery cell according to the embodiment of the second aspect of the present invention.

[0018] According to the battery of the embodiment of the present invention, by providing the above-mentioned battery cell, not only can the structural strength of the explosion-proof valve area be increased, but the stability of the explosion-proof valve is also improved; when thermal runaway occurs in the battery cell, the high-temperature gas can also be discharged in time through the explosion-proof valve and the avoidance hole, thereby improving the safety of the battery cell and further improving the safety of the battery cell.

[0019] Additional aspects and advantages of the present invention will be given in part in the following description and will become apparent from the following description or learned through 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 readily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0021] Figure 1is a schematic diagram of a battery cell according to some embodiments of the present invention;

[0022] Figure 2 yes Figure 1 Schematic diagram of the exploded view of the battery cell;

[0023] Figure 3 yes Figure 1 A side view of a battery cell in FIG.

[0024] Figure 4 yes Figure 3 Sectional view along line AA;

[0025] Figure 5 yes Figure 4 Enlarged view of point B in the middle.

[0026] Reference numerals:

[0027] 100. Battery cell;

[0028] 10. Shell; 11. Explosion-proof hole; 12. First side wall; 13. Second side wall;

[0029] 20. Explosion-proof valve structure;

[0030] 2. Explosion-proof valve;

[0031] 3. Reinforcement plate; 31. Avoidance hole; 32. Annular rib; 33. Reinforcement rib. DETAILED DESCRIPTION

[0032] The following describes embodiments of the present invention in detail. 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 intended only to explain the present invention and are not to be construed as limiting the present invention.

[0033] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", etc., indicating directions or positional relationships, are based on the directions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply 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 invention. 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 invention, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0034] In the description of this utility model, it should be noted that, unless otherwise expressly specified or limited, the terms "installed," "connected," and "connected" should be understood in a broad sense. For example, they can refer to fixed connections, detachable connections, or integral connections; structural connections, or electrical connections; direct connections, or indirect connections through an intermediate medium; and can refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of the above terms in this utility model based on specific circumstances.

[0035] Reference below Figure 1-Figure 5 An explosion-proof valve structure 20 according to an embodiment of the present invention is described.

[0036] According to the explosion-proof valve structure 20 of the first embodiment of the present invention, the explosion-proof valve structure 20 is used for a battery cell 100. The battery cell 100 includes a housing 10, which has an explosion-proof hole 11. The explosion-proof valve structure 20 includes an explosion-proof valve 2 and a reinforcement plate 3. The explosion-proof valve 2 is located within the explosion-proof hole 11, and the reinforcement plate 3 is located outside the housing 10. This can prevent the reinforcement plate 3 from occupying the internal space of the housing 10. The reinforcement plate 3 is used to increase the structural strength of the explosion-proof valve 2 area, thereby improving the structural stability of the explosion-proof valve 2.

[0037] The reinforcing plate 3 has an avoidance hole 31, which is connected to the explosion-proof valve 2. When the battery cell 100 has thermal runaway, the high-temperature gas in the battery cell 100 can be discharged from the battery cell 100 through the opening of the explosion-proof valve 2 and the avoidance hole 31. When the battery cell 100 has thermal runaway, the high-temperature gas can be discharged in time, thereby improving the safety of the battery cell 100.

[0038] In one example, the shell 10 includes a first side wall 12, a second side wall 13, a third side wall and a fourth side wall connected in sequence, wherein the first side wall 12 and the third side wall are arranged opposite to each other, and the second side wall 13 and the fourth side wall are arranged opposite to each other, and the area of ​​the second side wall 13 and the fourth side wall is larger than the area of ​​the first side wall 12 and the third side wall. The explosion-proof valve 2 can be arranged on the first side wall 12 and / or the third side wall. The area of ​​the first side wall 12 and the third side wall is relatively small, which also makes the area of ​​the reinforcing plate 3 smaller, thereby saving the material of the reinforcing plate 3.

[0039] For example, the reinforcing plate 3 can be connected to the housing 10 by welding, bonding, snapping, etc.

[0040] According to the explosion-proof valve structure 20 of the embodiment of the present invention, a reinforcing plate 3 is provided on the outer side of the shell 10. The reinforcing plate 3 has an avoidance hole 31 connected to the explosion-proof valve 2. The reinforcing plate 3 is used to increase the structural strength of the explosion-proof valve 2 area, thereby improving the structural stability of the explosion-proof valve 2; at the same time, when thermal runaway occurs in the battery cell 100, the high-temperature gas can be discharged in time through the explosion-proof valve 2 and the avoidance hole 31, thereby improving the safety of the battery cell 100.

[0041] According to some embodiments of the present invention, referring to Figure 1-Figure 5 In the projection plane parallel to the reinforcing plate 3, the projection of the explosion-proof hole 11 is located within the projection of the avoidance hole 31. The size of the avoidance hole 31 is greater than or equal to the size of the explosion-proof hole 11. When thermal runaway occurs in the battery cell 100, the reinforcing plate 3 is prevented from blocking the high-temperature gas from being discharged from the explosion-proof valve 2, so that the high-temperature gas can be discharged quickly and smoothly from the battery cell 100.

[0042] According to some embodiments of the present invention, referring to Figure 1-Figure 5 The side of the reinforcing plate 3 facing away from the housing 10 has an annular rib 32 and a plurality of reinforcing ribs 33 arranged at intervals. The annular rib 32 is arranged around the avoidance hole 31. The annular rib 32 and the plurality of reinforcing ribs 33 are used to increase the structural strength of the reinforcing plate 3 and further improve the structural stability of the reinforcing plate 3.

[0043] For example, multiple reinforcing ribs 33 can be integrally stamped from the reinforcing plate 3, which is beneficial for improving the yield rate and reducing the scrap rate compared to stamping on the shell 10. Moreover, the area of ​​the reinforcing plate 3 is smaller, and the cost will also be reduced compared to the entire shell 10 being scrapped due to stamping defects.

[0044] According to some embodiments of the present invention, referring to Figure 1-Figure 5 , multiple reinforcement ribs 33 are symmetrically arranged in the first direction of the avoidance hole 31 (for example, refer to the attached Figure 1 The first direction is the length direction of the battery cell 100.

[0045] According to some embodiments of the present invention, referring to Figure 1-Figure 5 The annular rib 32 is along the second direction (for example, see the attached Figure 1 The height of the annular rib 32 (in the direction e2) is H1, satisfying the following: 0.01mm≤H1≤20mm; and / or the height of the reinforcing rib 33 along the second direction is H2, satisfying the following: 0.01mm≤H2≤20mm. The heights of the annular rib 32 and the reinforcing rib 33 along the second direction within this range not only increase the structural strength of the reinforcing plate 3 but also prevent the annular rib 32 and the reinforcing rib 33 from being too high and occupying the internal space of the battery.

[0046] Preferably, the height of the annular rib 32 along the second direction ranges from 0.1 mm to 20 mm, and the height of the reinforcing rib 33 along the second direction ranges from 0.1 mm to 20 mm. For example, the height of the annular rib 32 along the second direction can be 0.01 mm, 0.1 mm, 5 mm, 10 mm, or 20 mm, and the height of the reinforcing rib 33 along the second direction can be 0.01 mm, 0.1 mm, 5 mm, 10 mm, or 20 mm, etc.

[0047] According to some embodiments of the present invention, referring to Figure 1-Figure 2 The arc transition at the corner of the reinforcing plate 3 avoids stress concentration at the corner of the reinforcing plate 3, and also avoids the corner of the reinforcing plate 3 from scratching the installation workers, and also facilitates the welding and fixing of the reinforcing plate 3 and the shell 10.

[0048] According to some embodiments of the present invention, referring to Figure 1-Figure 5 The thickness of the reinforcing plate 3 along the second direction is D, which satisfies: 0.01mm≤D≤20mm. The thickness of the reinforcing plate 3 along the second direction is within this range, which not only increases the structural strength of the reinforcing plate 3, but also avoids the thickness of the reinforcing plate 3 being too thick and occupying the internal space of the battery.

[0049] Preferably, the thickness of the reinforcing plate 3 along the second direction ranges from 0.1 mm to 20 mm. For example, the thickness of the reinforcing plate 3 along the second direction can be 0.01 mm, 0.1 mm, 5 mm, 10 mm or 20 mm.

[0050] According to some embodiments of the present invention, referring to Figure 1-Figure 5 The reinforcing plate 3 includes at least one plate body. The reinforcing plate 3 may include one plate body or multiple plate bodies. When the reinforcing plate 3 includes multiple plate bodies, the multiple plate bodies are overlapped with each other along the thickness direction of the plate body, which can facilitate the processing and setting of the reinforcing plate 3.

[0051] When the reinforcing plate 3 includes a plurality of plate bodies, a plurality of reinforcing ribs 33 may be integrally punched out of the plurality of plate bodies.

[0052] The battery cell 100 according to the second embodiment of the present invention includes: the explosion-proof valve structure 20 according to the first embodiment of the present invention.

[0053] According to the battery cell 100 of the embodiment of the present invention, by providing the above-mentioned explosion-proof valve structure 20, not only the structural strength of the explosion-proof valve 2 area can be increased, but also the structural stability of the explosion-proof valve 2 can be improved; when thermal runaway occurs in the battery cell 100, the high-temperature gas can also be discharged in time through the explosion-proof valve 2 and the avoidance hole 31, thereby improving the safety of the battery cell 100.

[0054] The battery according to the embodiment of the third aspect of the present invention includes: the battery cell 100 according to the embodiment of the second aspect of the present invention.

[0055] According to the battery of the embodiment of the present invention, by providing the above-mentioned battery cell 100, not only the structural strength of the explosion-proof valve 2 area can be increased, but also the structural stability of the explosion-proof valve 2 can be improved; when thermal runaway occurs in the battery cell 100, the high-temperature gas can also be discharged in time through the explosion-proof valve 2 and the avoidance hole 31, thereby improving the safety of the battery cell 100 and further improving the safety of the battery cell 100.

[0056] Throughout this specification, references to terms such as "some embodiments," "optionally," "further," or "some examples" indicate that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0057] 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 purpose 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 for a battery cell, characterized in that: The battery cell includes a shell having an explosion-proof hole, and the explosion-proof valve structure includes: an explosion-proof valve, the explosion-proof valve being located in the explosion-proof hole; A reinforcing plate is located on the outside of the shell, and the reinforcing plate has an avoidance hole communicated with the explosion-proof valve.

2. The explosion-proof valve structure according to claim 1, characterized in that: In a projection plane parallel to the reinforcing plate, the projection of the explosion-proof hole is located within the projection of the avoidance hole.

3. The explosion-proof valve structure according to claim 1, characterized in that: The side of the reinforcing plate facing away from the shell has an annular convex rib and a plurality of reinforcing ribs arranged at intervals, and the annular convex rib is arranged around the avoidance hole.

4. The explosion-proof valve structure according to claim 3, characterized in that: The plurality of reinforcing ribs are symmetrically arranged on both sides of the avoidance hole in the first direction.

5. The explosion-proof valve structure according to claim 3, characterized in that: The height of the annular rib along the second direction is H1, which satisfies: 0.01 mm ≤ H1 ≤ 20 mm; and / or the height of the reinforcing rib along the second direction is H2, which satisfies: 0.01 mm ≤ H2 ≤ 20 mm.

6. The explosion-proof valve structure according to claim 1, characterized in that: The reinforcing plate has arc transition at the corner.

7. The explosion-proof valve structure according to claim 1, characterized in that: The thickness of the reinforcing plate along the second direction is D, which satisfies: 0.01 mm ≤ D ≤ 20 mm.

8. The explosion-proof valve structure according to any one of claims 1 to 7, characterized in that: The reinforcing plate includes at least one plate body, and a plurality of the plate bodies are stacked on each other along a thickness direction of the plate body.

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

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

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