CN219759772U - Top cover assembly and battery - Google Patents

Abstract

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a top cover assembly and a battery, wherein the top cover assembly comprises a top cover plate and a convex part, the convex part protrudes out of the edge of the lower surface of the top cover plate along the thickness direction of the top cover plate, and the outer side wall of the convex part and the outer side wall of the top cover plate are positioned on the same horizontal plane; through the setting of lamina tecti and convex part, the convex part is along the thickness direction protrusion of lamina tecti in lamina tecti lower surface's edge, the effectual intensity that strengthens lamina tecti, and the lamina tecti appears bending deformation in the battery production line equipment in-process, and then influences lamina tecti and casing laser welding's effect, simultaneously, also can avoid the battery to invert the assembly time in the module, leads to the problem of lamina tecti and casing's welding department fracture because of lamina tecti's intensity is not enough.

Description

Top cover assembly and battery

Technical Field

The utility model belongs to the technical field of battery production and manufacturing, and particularly relates to a top cover assembly and a battery.

Background

The lithium ion battery as a novel secondary battery has the advantages of high energy density and power density, high working voltage, light weight, small volume, long cycle life, good safety, environmental protection and the like, and has wide application prospect in the aspects of portable electric appliances, electric tools, large energy storage, electric traffic power sources and the like.

When the strength of the existing battery top cover is insufficient, the top cover plate is easy to bend and deform in the battery production line assembly process, and the laser welding effect of the top cover plate and the battery shell is affected.

Disclosure of Invention

One of the objects of the present utility model is: the utility model provides a top cap subassembly to when solving among the prior art intensity of battery top cap not enough, the easy bending deformation that appears of top cap board in the battery production line assembly process influences the technical problem of top cap board and battery case laser welding's effect.

In order to achieve the above purpose, the present utility model adopts the following technical scheme:

the top cover assembly comprises a top cover plate and a convex part, wherein the convex part protrudes out of the edge of the lower surface of the top cover plate along the thickness direction of the top cover plate, and the outer side wall of the convex part and the outer side wall of the top cover plate are positioned on the same horizontal plane.

Preferably, the protrusion is disposed around an edge of the lower surface of the top cover plate.

Preferably, the outer side wall of the convex portion is provided with a chamfer.

Preferably, the radius of the chamfer is 0-0.6 mm.

Preferably, the inner side wall of the protrusion is inclined to the outer side wall.

Preferably, the angle between the inner side wall of the convex part and the lower surface of the top cover plate is 90-160 degrees.

Preferably, the thickness of the top cover plate is T, and the sum of the thicknesses of the top cover plate and the protruding portion is H, which satisfies the following relation: h=t×a, wherein 1 < a.ltoreq.2.

Preferably, the solar cell further comprises two polar posts, wherein two electrode leading-out holes are arranged on the top cover plate in parallel, the two polar posts and the two electrode leading-out holes are arranged in one-to-one correspondence, and the two polar posts are in insulating connection with the top cover plate.

Preferably, the electrode lead-out device further comprises lower plastic, the lower plastic is arranged below the top cover plate, the protruding portion surrounds the lower plastic, the bottom of the lower plastic is located below the bottom of the protruding portion, and through holes corresponding to the two electrode lead-out holes are formed in the lower plastic.

Another object of the utility model is: the utility model provides a battery, including casing, electric core and the top cap subassembly that the description was previously mentioned, the top cap subassembly is sealed the opening of casing, just the top cap subassembly with be formed with between the casing and hold the chamber, the opening of casing is provided with accepts the platform, accept the platform with the bottom of convex part offsets, the electric core set up in hold the intracavity.

The top cover assembly has the beneficial effects that through the arrangement of the top cover plate and the convex parts, the convex parts protrude out of the edge of the lower surface of the top cover plate along the thickness direction of the top cover plate, so that the strength of the top cover plate is effectively enhanced, the bending deformation of the top cover plate in the battery production line assembly process is avoided, the laser welding effect of the top cover plate and the shell is further influenced, and meanwhile, the problem that the welding part of the top cover plate and the shell is cracked due to insufficient strength of the top cover plate when the battery is inversely assembled in the module is also avoided.

Drawings

Features, advantages, and technical effects of exemplary embodiments of the present utility model will be described below with reference to the accompanying drawings.

Fig. 1 is a schematic view of the structure of the cap assembly of the present utility model.

Fig. 2 is another structural view of the cap assembly of the present utility model.

Fig. 3 is an enlarged schematic view of the structure at a in fig. 2.

Fig. 4 is a schematic structural view of the roof panel of the present utility model.

Fig. 5 is an enlarged schematic view of the structure at B in fig. 4.

Fig. 6 is a schematic structural view of the housing of the present utility model.

Fig. 7 is an enlarged schematic view of the structure at C in fig. 6.

Wherein reference numerals are as follows:

100. a top cover assembly;

10. a top cover plate; 11. electrode lead-out holes; 12. a liquid injection hole; 13. an outer sidewall;

20. a convex portion; 21. an inner sidewall; 22. an outer sidewall; 23. chamfering;

30. a pole;

40. lower plastic;

50. an explosion-proof valve;

200. a housing; 210. a receiving chamber; 220. a receiving table.

Detailed Description

Certain terms are used throughout the description and claims to refer to particular components. Those of skill in the art will appreciate that a hardware manufacturer may refer to the same component by different names. The description and claims do not take the form of an element differentiated by name, but rather by functionality. As used throughout the specification and claims, the word "comprise" is an open-ended term, and thus should be interpreted to mean "include, but not limited to. By "substantially" is meant that within an acceptable error range, a person skilled in the art can solve the technical problem within a certain error range, substantially achieving the technical effect.

Furthermore, the terms "first," "second," and the like are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the present utility model, unless explicitly specified and limited otherwise, the terms "mounted," "connected," "secured," and the like are to be construed broadly and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present utility model can be understood by those of ordinary skill in the art according to the specific circumstances.

The present utility model will be described in further detail with reference to fig. 1 to 7, but the present utility model is not limited thereto.

The battery of the embodiment of the utility model comprises a shell 200, an electric core and a top cover assembly 100, wherein the electric core is arranged in the shell 200, and the top cover assembly 100 seals an opening of the shell 200.

The housing 200 of the embodiment of the utility model has an opening, the top cover assembly 100 seals the opening of the housing 200, a receiving cavity 210 is formed between the top cover assembly 100 and the housing 200, the receiving cavity 210 is provided with a receiving stand 220 near the opening of the housing 200, and the battery cell is disposed in the receiving cavity 210.

Compared with the prior art, the housing 200 of the embodiment of the utility model has the advantages that the accommodating cavity 210 is arranged, the accommodating cavity 210 is used for accommodating the battery cell, the bearing table 220 is arranged at the opening of the housing 200, the bearing table 220 is used for propping against the bottom of the top cover assembly 100 to support and limit the top cover assembly 100, the mounting suitability of the housing 200 and the top cover assembly 100 is effectively improved, and the consistency of the weld penetration of the housing 200 is further improved.

Referring to fig. 1 to 5, a top cover assembly 100 according to an embodiment of the present utility model includes a top cover plate 10 and a protrusion 20, wherein the protrusion 20 protrudes from an edge of a lower surface of the top cover plate 10 along a thickness direction of the top cover plate 10, and an outer side wall 22 of the protrusion 20 and an outer side wall 22 of the top cover plate 10 are located at the same horizontal plane.

Compared with the prior art, the top cover assembly 100 of the embodiment of the utility model has the advantages that through the arrangement of the top cover plate 10 and the convex parts 20, the convex parts 20 protrude out of the edge of the lower surface of the top cover plate 10 along the thickness direction of the top cover plate 10, so that the strength of the top cover plate 10 is effectively enhanced, the bending deformation of the top cover plate 10 in the battery production line assembly process is avoided, the laser welding effect of the top cover plate 10 and the shell 200 is further influenced, and meanwhile, the problem that the welding part of the top cover plate 10 and the shell 200 is cracked due to insufficient strength of the top cover plate 10 when the battery is inversely assembled in a module is also avoided.

The top cover 10 and the convex portion 20 are integrally formed, that is, the top cover 10 and the convex portion 20 are integrally formed.

It should be noted that, the receiving base 220 abuts against the bottom of the protruding portion 20, supports and limits the top cover assembly 100, effectively improves the suitability of the installation of the housing 200 and the top cover assembly 100, and further improves the consistency of the weld penetration of the housing 200.

The width L of the bottom of the convex portion 20 is 0 to 4mm. For example, 0.5mm, 1mm, 1.3mm, 1.7mm, 2mm, 2.5mm, 3mm, 3.4mm, 3.7mm or 4mm, but are not limited to the recited values, and other non-recited values within the range of values are equally applicable.

Referring to fig. 2, in some embodiments, the protrusion 20 is disposed around an edge of the lower surface of the top cover plate 10. Through the cooperation of convex part 20 and lamina tecti 10, the convex part 20 encircles the marginal setting of lamina tecti 10 lower surface, and the effectual edge at lamina tecti 10 forms the strengthening rib to strengthen lamina tecti 10's intensity, avoid the lamina tecti 10 to appear bending deformation in the battery production line assembly process.

Referring to fig. 2-3, in some embodiments, the outer sidewall 22 of the boss 20 is provided with a chamfer 23. Through the setting of chamfer 23, the shape of accepting the platform 220 is corresponding with chamfer 23, when top cap subassembly 100 is installed on casing 200, chamfer 23 and accepting the platform 220 butt, support and spacing top cap subassembly 100 through accepting the cooperation of platform 220 and chamfer 23, the effectual suitability that improves casing 200 and top cap subassembly 100 installation, and then improve the uniformity of casing 200 welding seam penetration, simultaneously, through setting up chamfer 23, the effectual top cap subassembly 100 equipment of preventing or in the transportation, top cap subassembly 100 is because of colliding with and is led to appearing the wire, and then influence the equipment of follow-up top cap subassembly 100 or the safe in utilization of battery.

In some embodiments, the chamfer 23 has a radius of 0-0.6 mm. By setting the radius of the chamfer 23, the radius of the chamfer 23 is 0-0.6 mm, the radius of the chamfer 23 needs to be set according to the size of the convex part 20, and the chamfer can be set according to actual requirements when in use.

Further, the radius of the chamfer 23 is 0 to 0.2mm, 0.2 to 0.4mm or 0.4 to 0.6mm. For example, the radius of chamfer 23 may be 0.15mm, 0.17mm, 0.21mm, 0.25mm, 0.35mm, 0.37mm, 0.45mm, 0.47mm, 0.55mm, or 0.57mm, but is not limited to the recited values, as other non-recited values within the range of values are equally applicable.

Referring to fig. 4, in some embodiments, the inner side wall 21 of the protrusion 20 is inclined toward the outer side wall 22. By providing the inner side wall 21 of the convex portion 20, the inner side wall 21 of the convex portion 20 is inclined toward the outer side wall 22, so that the strength of the convex portion 20 is effectively improved, and the strength of the roof board 10 is enhanced.

Referring to fig. 5, in some embodiments, the angle R between the inner sidewall 21 of the protrusion 20 and the lower surface of the top cover plate 10 is 90 ° to 160 °. Through the angle setting of contained angle R, contained angle R's angle is 90 ~ 160, during the use, can advance setting according to actual demand.

Further, the included angle R is 90-104 degrees, 104-118 degrees, 118-132 degrees, 132-146 degrees or 146-160 degrees. For example, the included angle may be 100 °, 115 °, 120 °, 125 °, 135 °, 137 °, 145 °, 150 °, or 155 °, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.

Referring to fig. 4, in some embodiments, the top cover 10 has a thickness T, and the sum of the thicknesses of the top cover 10 and the protrusion 20 is H, which satisfies the following relationship: h=t×a, wherein 1 < a.ltoreq.2. Through setting up of top board 10 and the thickness sum H of convex part 20, H=T is a, and wherein 1 < a is less than or equal to 2, the effectual thickness of convex part 20 that sets up prevents that the thickness of convex part 20 from excessively thick from leading to the decline of the intensity of convex part 20 self to reduce the intensity of top cap originally.

The thickness T of the top cover plate 10 is 1 to 5mm. For example, the top cover plate 10 has a thickness T of 1.2mm, 1.5mm, 2.4mm, 2.7mm, 3.5mm, 4mm, or 4.7mm, but is not limited to the recited values, and other non-recited values within the range of values are equally applicable.

Referring to fig. 1, in some embodiments, the top cover 10 further includes two electrode lead-out holes 11 arranged in parallel, the two electrode lead-out holes 11 are arranged in one-to-one correspondence with the two electrode lead-out holes 30, and the two electrode lead-out holes 30 are connected with the top cover 10 in an insulating manner. Through the setting of two posts 30, two posts 30 and two electrode lead-out holes 11 one-to-one set up, and post 30 sets up in corresponding electrode lead-out hole 11, and effectual structure to lamina tecti 10 sets up, through two posts 30 all with lamina tecti 10 insulating connection, the effectual battery short circuit that prevents post 30 and lamina tecti 10 contact.

The polarities of the two poles 30 are opposite, one of the two poles 30 is a positive pole 30, and the other of the two poles 30 is a negative pole 30.

Referring to fig. 1-2, in some embodiments, the device further includes a lower plastic 40, the lower plastic 40 is disposed below the top cover 10, the protruding portion 20 is disposed around the lower plastic 40, the bottom of the lower plastic 40 is located below the bottom of the protruding portion 20, and through holes corresponding to the two electrode lead-out holes 11 are formed on the lower plastic 40. Through the setting of lower plastic 40, lower plastic 40 sets up in the below of lamina tecti 10, has the effect of support and insulation, effectual improvement top cap subassembly 100's safety in utilization. Meanwhile, the bottom of the lower plastic 40 is located below the bottom of the protrusion 20 to prevent the lower plastic 40 from interfering with the welding portion when the protrusion 20 is welded with the housing 200.

It should be noted that, the top cover plate 10 is further provided with a liquid injection hole 12 and an explosion-proof valve 50, the top cover plate 10 is provided with a sealing member at the position of the liquid injection hole 12, the sealing member is used for sealing the liquid injection hole 12, and the lower plastic 40 is provided with an air permeable portion corresponding to the position of the explosion-proof valve 50.

The battery cell provided by the embodiment of the utility model comprises a positive pole piece, a negative pole piece and a diaphragm arranged between the positive pole piece and the negative pole piece. The positive electrode plate comprises a positive electrode current collector and a positive electrode active material layer, and the positive electrode active material layer is coated on the surface of the positive electrode current collector; the positive electrode current collector comprises a positive electrode coating area and a positive electrode lug connected to the positive electrode coating area, wherein the positive electrode coating area is coated with a positive electrode active material layer, and the positive electrode lug is not coated with the positive electrode active material layer. The negative electrode plate comprises a negative electrode current collector and a negative electrode active material layer, and the negative electrode active material layer is coated on the surface of the negative electrode current collector; the negative electrode current collector comprises a negative electrode coating area and a negative electrode tab connected to the negative electrode coating area, wherein the negative electrode coating area is coated with a negative electrode active material layer, and the negative electrode tab is not coated with the negative electrode active material layer. Taking a lithium ion battery as an example, the material of the positive electrode current collector may be aluminum, the positive electrode active material layer includes a positive electrode active material, and the positive electrode active material may be lithium cobaltate, lithium iron phosphate, ternary lithium, lithium manganate or the like. The material of the anode current collector may be copper, the anode active material layer includes an anode active material, and the anode active material may be carbon or silicon, or the like. The separator may be made of PP (polypropylene) or PE (polyethylene).

Variations and modifications of the above embodiments will occur to those skilled in the art to which the utility model pertains from the foregoing disclosure and teachings. Therefore, the present utility model is not limited to the above-described embodiments, but is intended to be capable of modification, substitution or variation in light thereof, which will be apparent to those skilled in the art in light of the present teachings. In addition, although specific terms are used in the present specification, these terms are for convenience of description only and do not limit the present utility model in any way.

Claims (10)

1. A top cap subassembly, characterized in that: the novel cover plate comprises a top cover plate (10) and a convex part (20), wherein the convex part (20) protrudes out of the edge of the lower surface of the top cover plate (10) along the thickness direction of the top cover plate (10), and the outer side wall (22) of the convex part (20) and the outer side wall (13) of the top cover plate (10) are positioned on the same horizontal plane.

2. The header assembly of claim 1, wherein: the convex portion (20) is provided around the edge of the lower surface of the top cover plate (10).

3. The header assembly of claim 1, wherein: the outer side wall (22) of the convex part (20) is provided with a chamfer (23).

4. A cap assembly according to claim 3, wherein: the radius of the chamfer angle (23) is 0-0.6 mm.

5. The header assembly of claim 1, wherein: the inner side wall (21) of the protruding part (20) is inclined to the outer side wall (22).

6. The header assembly of claim 5, wherein: the angle (R) between the inner side wall (21) of the protruding part (20) and the lower surface of the top cover plate (10) is 90-160 degrees.

7. The header assembly of claim 1, wherein: the thickness of the top cover plate (10) is T, the sum of the thicknesses of the top cover plate (10) and the convex part (20) is H, and the following relational expression is satisfied: h=t×a, wherein 1 < a.ltoreq.2.

8. The header assembly of claim 1, wherein: the solar cell battery also comprises two pole posts (30), wherein two electrode leading-out holes (11) are formed in the top cover plate (10) in parallel, the two pole posts (30) and the two electrode leading-out holes (11) are arranged in one-to-one correspondence, and the two pole posts (30) are connected with the top cover plate (10) in an insulating mode.

9. The header assembly of claim 8, wherein: the electrode lead-out device is characterized by further comprising a lower plastic (40), wherein the lower plastic (40) is arranged below the top cover plate (10), the convex part (20) surrounds the lower plastic (40), the bottom of the lower plastic (40) is positioned below the bottom of the convex part (20), and through holes which correspond to the two electrode lead-out holes (11) respectively are formed in the lower plastic (40).

10. A battery, characterized in that: the battery pack comprises a shell (200), a battery cell and the top cover assembly according to any one of claims 1 to 9, wherein the top cover assembly (100) seals an opening of the shell (200), a containing cavity (210) is formed between the top cover assembly (100) and the shell (200), a bearing table (220) is arranged at the opening of the shell (200), the bearing table (220) abuts against the bottom of the protruding portion (20), and the battery cell is arranged in the containing cavity (210).