CN218632245U

CN218632245U - Secondary battery cover plate assembly and battery

Info

Publication number: CN218632245U
Application number: CN202222946787.3U
Authority: CN
Inventors: 孔潇; 徐永刚; 曹星宇
Original assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Current assignee: Envision Power Technology Jiangsu Co Ltd; Envision Ruitai Power Technology Shanghai Co Ltd
Priority date: 2022-11-04
Filing date: 2022-11-04
Publication date: 2023-03-14
Anticipated expiration: 2032-11-04

Abstract

The utility model discloses a secondary battery cover plate subassembly and battery, this secondary battery cover plate subassembly is including apron main part, the utmost point post body and bottom plate. The cap body includes an electrode lead-out hole. The pole column body is provided with a plate body part and a column body part protruding out of the plate body part, the plate body part is positioned on the top surface of the cover plate main body, at least part of the column body part is inserted into the electrode leading-out hole, and the plate body part and the main body part are copper-aluminum composite integral parts. The bottom plate sets up in the bottom surface of apron main part, and column portion links to each other with the bottom plate is fixed. So that the battery performance is better.

Description

Secondary battery cover plate assembly and battery

Technical Field

The utility model relates to the technical field of batteries, in particular to secondary battery cover plate subassembly and battery.

Background

Batteries are widely used in electronic devices such as mobile phones, notebook computers, electric cars, electric planes, electric ships, electric toy cars, electric toy ships, electric toy planes, and electric tools, etc.

In the prior art, in the processing and manufacturing process of the battery, the negative pole column of the battery is formed by welding a copper plate and an aluminum plate and then connected to the cover plate main body, and after dissimilar metal welding, the strength of the joint surface is poor, so that the quality of the formed negative pole column is poor, and the performance of the battery is further influenced.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a secondary battery cover plate subassembly and battery for the battery performance is better.

In order to solve the above technical problem, an embodiment of the present invention provides a secondary battery cover plate assembly, including:

a cover plate body including an electrode lead-out hole;

the electrode lead-out hole is formed in the electrode body, and the electrode lead-out hole is formed in the electrode body; the plate body part and the column body part are copper-aluminum composite integral parts; and

the bottom plate is arranged on the bottom surface of the cover plate main body, and the column part is fixedly connected with the bottom plate.

The utility model discloses embodiment is copper aluminium composite integral through utmost point cylinder for prior art, forms for copper aluminium composite section bar promptly, need not through welding process to the intensity of utmost point cylinder is better, uses more stably, and the area of overflowing is more reliable. And the column body part is at least partially inserted into the electrode leading-out hole to be connected with the bottom plate, so that the pole body can be installed on the cover plate main body, the follow-up connection with the battery core is not influenced, and the performance of the battery is better.

In one embodiment, the top surface of the plate body portion has a recessed area corresponding in position and shape to the post portion.

In one embodiment, the volume of the recessed region is greater than or equal to the volume of the column portion.

In one embodiment, the thickness of the plate body portion ranges from 2mm to 6mm; the thickness of the column part ranges from 1mm to 3mm.

In one embodiment, the bottom plate is provided with a bottom plate body and a protruding part arranged on the top surface of the bottom plate body, and the protruding part is provided with a through hole;

the protruding part is at least partially inserted into the electrode leading-out hole and connected with the plate body part, and the column part is inserted into the through hole.

In one embodiment, the projection is welded to both the plate portion and the column portion.

In one embodiment, the bottom plate body is provided with an opening area;

the convex part is provided with a side wall which is connected with the top surface of the bottom plate body and surrounds the periphery of the opening area, and a connecting top which is connected with one side of the side wall departing from the bottom plate body, and the connecting top and the bottom plate body are oppositely arranged and are provided with the through holes; the connecting top is connected with the plate body part and the column body part in a welding mode.

In an embodiment, a groove is formed in one side of the connecting top, which is away from the plate body portion, and a groove wall of the groove, which is opposite to the plate body portion, is connected with the plate body portion in a welding manner.

In one embodiment, the thickness of the area with the groove on the connecting top ranges from 0.5mm to 2mm.

In one embodiment, the width of the groove ranges from 0.5mm to 2.5mm.

In one embodiment, the base plate extends at least partially away from the area where the base plate is fixed to the column portion to form an extension.

In one embodiment, the method further comprises:

a first spacer sandwiched between the bottom surface of the cover plate main body and the bottom plate;

a second spacer sleeved between the cylinder portion and the cover plate main body; and

a third spacer disposed between the top surface of the cap plate body and the plate body portion.

In one embodiment, the method comprises the following steps:

the secondary battery cover plate assembly according to any one of the above claims; and

and the electrode lug of the battery cell is connected with the bottom plate.

Drawings

Fig. 1 is a schematic structural diagram of a secondary battery cover plate assembly according to an embodiment of the present invention;

fig. 2 is an exploded view of a secondary battery cover plate assembly according to an embodiment of the present invention;

fig. 3 is a schematic structural diagram of a cover plate main body according to an embodiment of the present invention;

fig. 4 is a cross-sectional view of a secondary battery cover plate assembly according to an embodiment of the present invention;

FIG. 5 is a partial enlarged view of A in FIG. 4;

FIG. 6 is a schematic diagram of a pole body according to an embodiment of the present invention;

fig. 7 is a cross-sectional view of a base plate of an embodiment of the present invention;

fig. 8 is a schematic diagram of another perspective of the bottom plate according to an embodiment of the present invention.

Reference numerals:

1. a secondary battery cover plate assembly; 10. a cover plate main body; 11. an electrode lead-out hole; 20. a pole body; 21. a plate body portion; 211. a recessed region; 22. a cylindrical portion; 23. an aluminum layer; 24. a copper layer; 30. a base plate; 31. a base plate body; 311. an open area; 32. a projection; 321. a through hole; 322. a side wall; 323. connecting the top; 324. a groove; 3241. a trench wall; 33. an extension portion; 40. a first spacer; 50. a second spacer; 60. a third spacer; a. the thickness of the plate body portion; b. the thickness of the cylindrical portion; c. the thickness of the groove; d. the groove width of the groove.

Detailed Description

In order to make the objects, technical solutions and advantages of the present invention clearer, the following describes each embodiment of the present invention in detail with reference to the accompanying drawings. However, it will be appreciated by those of ordinary skill in the art that in various embodiments of the invention, numerous technical details are set forth in order to provide a better understanding of the present application. However, the technical solutions claimed in the claims of the present application can be implemented without these technical details and with various changes and modifications based on the following embodiments.

Throughout the specification and claims, the word "comprise" and variations thereof, such as "comprises" and "comprising", will be understood to have an open, inclusive meaning, i.e., will be interpreted to mean "including, but not limited to", unless the context requires otherwise.

Various embodiments of the present invention will be described in detail below with reference to the accompanying drawings in order to more clearly understand the objects, features and advantages of the present invention. It should be understood that the embodiments shown in the drawings are not intended as limitations on the scope of the invention, but are merely illustrative of the true spirit of the technical solution of the invention.

Reference throughout this specification to "one embodiment" or "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment is included in at least one embodiment. Thus, the appearances of the phrases "in one embodiment" or "in an embodiment" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments.

As used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. It should be noted that the term "or" is generally employed in its sense including "and/or" unless the context clearly dictates otherwise.

In the following description, for the sake of clarity of illustrating the structure and operation of the present invention, directional terms are used, but the terms "front", "rear", "left", "right", "outer", "inner", "outer", "inward", "upper", "lower", etc. should be interpreted as words of convenience and should not be interpreted as limiting terms.

Embodiments of the present invention are described below with reference to the drawings.

An embodiment of the utility model provides a battery, this battery include as shown in figure 1 secondary battery cover plate subassembly 1 and electric core. The tabs of the battery cells are connected to the bottom plate 30. The battery also comprises a shell, the shell is provided with an opening, the battery core is placed in the shell, and the secondary battery cover plate component 1 covers the opening.

Fig. 2 shows an exploded view of the secondary battery cover plate assembly 1, and the secondary battery cover plate assembly 1 includes a cover plate main body 10, a pole body 20, and a bottom plate 30. The electrode post 20 may be a negative electrode post in the present embodiment, and the negative electrode post is specifically described below as an example.

As shown in fig. 3, the cap body 10 includes an electrode lead-out hole 11. Fig. 4 shows a sectional view of the secondary battery cover plate assembly 1, fig. 5 shows a partially enlarged sectional view of the pole body 20 in fig. 4, the pole body 20 has a body portion 21 and a body portion 22 protruding from the body portion 21, the body portion 21 is located on the top surface of the cover plate body 10, the body portion 22 is partially inserted into the electrode lead-out hole 11, and the body portion 21 and the body portion 22 are a copper-aluminum composite integral piece. The base plate 30 is disposed on the bottom surface of the cover main body 10, and the column part 22 is fixedly connected to the base plate 30. Wherein, the pole ear of the battery cell is connected with the bottom plate 30.

Utmost point cylinder 20 constitutes for aluminum product and copper product owing to be the negative pole post among the prior art, can tailor and weld together through friction weld behind aluminum plate and the copper, nevertheless because the hardness of aluminium is little can be out of shape, leads to the faying face intensity of aluminium and copper relatively poor, can influence the condition of overflowing, and friction weld also can increase the dust of faying face department, can let the installation processing process of battery more loaded down with trivial details. The utility model discloses improve based on this to above-mentioned prior art's scheme, set up to the compound integral part of copper aluminium through utmost point cylinder, need not through welding process for the compound section bar of copper aluminium forms promptly to utmost point cylinder 20's intensity is better, uses more stably, and the area of overflowing is more reliable. And at least part of the column part 22 is inserted into the electrode leading-out hole 11 to be connected with the bottom plate 30, so that the pole body 20 can be installed on the cover plate main body 10, the subsequent connection with a battery core is not influenced, and the performance of the battery is better.

Preferably, as shown in fig. 5, the top surface of the plate body portion 21 has a recessed area 211, and the position and shape of the recessed area 211 correspond to those of the column portion 22. The setting can be performed by those skilled in the art according to actual needs. Specifically, before the pole body 20 is manufactured, a copper-aluminum composite plate with a suitable size is cut, the top surface of the copper-aluminum composite plate is stamped from top to bottom, so that the top surface is recessed to form a recessed region 211, and the bottom surface is provided with a protruding pole body 22, so that the pole body 20 is formed. For example, in the embodiment of the present invention, the pole body 20 is configured as shown in fig. 6, and the aluminum layer 23 is above the dotted line of the pole body 20, and the copper layer 24 is below the dotted line. It should be understood that the pole body 20 is not limited to the structure shown in fig. 6.

Alternatively, the pole posts 20 may be formed by treating a copper-aluminum composite plate in other ways. As can be seen from the above, the pole body 20 formed in this embodiment is formed by the original copper-aluminum composite plate under the condition that the loss is hardly reduced, and the waste of consumables is not caused. The copper-aluminum composite plate manufactured into the pole column 20 is regular in shape, and waste caused by irregular shape of the residual materials of the original plate due to the fact that the copper-aluminum composite plate is cut from the original plate is avoided.

Further, the volume of the recessed region 211 is greater than or equal to the volume of the column portion 22. That is, the volume of the concave region 211 is substantially the same as the volume of the pillar portion 22, and the volume of the pillar portion 22 is actually slightly smaller than the volume of the concave region 211. The area of the concave region 211 occupying the top surface area of the plate body 21 is set within a reasonable range, so that the battery with the secondary battery cover plate assembly 1 is not influenced to be connected with other batteries in parallel or in series, and the flow area is ensured.

Furthermore, the thickness a of the plate body portion ranges from 2mm to 6mm, alternatively the thickness a may be 3mm, 4mm or 5mm. The thickness b of the body portion may range from 1mm to 3mm, alternatively the thickness b may be 1.2mm, 1.5mm, 1.8mm or 2.5mm. This arrangement ensures the strength of the pole body 20, and can be set by those skilled in the art according to actual needs.

Further, as shown in fig. 7, the base plate 30 has a base plate body 31 and a protrusion 32 provided on the top surface of the base plate body 31, and the protrusion 32 is opened with a through hole 321. As shown in fig. 5, the protrusion 32 is partially inserted into the electrode lead-out hole 11 and connected to the plate body 21, and the post 22 is inserted into the through hole 321, so that the bottom plate 30 and the post 20 are better fitted and mounted on the cover plate body 10. In actual installation, the column 22 and the bottom plate 30 may be riveted, and then the column 22 and the bottom plate 30 may be welded together. The setting can be performed by those skilled in the art according to actual needs. The fitting installation between the base plate 30 and the cover main body 10 is made more meticulous by the above configuration.

Further, the projection 32 is welded to both the plate body portion 21 and the column portion 22. In particular, other welding forms such as friction welding, laser welding and the like can be adopted, and the arrangement can be set by a person skilled in the art according to actual needs. Thereby increasing the connection area of the bottom plate 30 and the pole body 20, making the connection of the pole body 20 and the bottom plate 30 more stable, and increasing the flow area.

In other embodiments, the protrusion 32 and the plate body 21 may be connected by conductive adhesive, or in other forms.

Preferably, as shown in fig. 7, an opening area 311 is opened on the bottom plate body 31. The protruding portion 32 has a side wall 322 connected to the top surface of the bottom plate body 31 and surrounding the periphery of the opening region 311, and a connecting top 323 connected to a side of the side wall 322 facing away from the bottom plate body 31, the connecting top 323 being disposed opposite to the bottom plate body 31 and having a through hole 321, the connecting top 323 being welded to both the plate body portion 21 and the column portion 22. It is convenient to connect the pole body 20 with the base plate 30 by operating from the open region 311 and insert the pole body 20 into the cap body 10. The setting can be performed by those skilled in the art according to actual needs.

Specifically, as shown in fig. 7, a side of the connecting top 323 facing away from the plate body portion 21 is provided with a groove 324, and a groove wall 3241 of the groove 324 opposite to the plate body portion 21 is welded to the plate body portion 21. The welding track of the groove wall 3241 and the plate body 21 may be wave-shaped, dot-shaped or other shapes. As shown in fig. 8, the groove 324 is an annular region around the outside of the through hole 321, and the groove 324 is provided to define a welding region, and in addition, the groove wall of the groove 324 opposite to the plate body portion 21 can be connected with the plate body portion 21 by welding, and the protrusion 32 can be provided with a thicker portion, so that the bottom plate 30 has better stability, and those skilled in the art can perform the setting according to actual needs. It is understood that the groove 324 may be formed in other shapes instead of a ring shape, or may be formed in a partial region outside the through hole 321. The thickness of the coupling peak 323 is reduced by the provision of the groove 324, so that the coupling peak 323 and the plate body portion 21 can be more easily welded.

Preferably, as shown in fig. 7, the thickness c of the region of the connecting tip 323 provided with the groove 324 ranges from 0.5mm to 2mm, alternatively, the thickness may be 1.2mm, 1.5mm, 1.8mm or 0.8mm. Can let the welding effect better in above-mentioned thickness within range, prevent that the intensity of the face of weld can't be guaranteed to the thickness undersize, because the face of weld that thickness is too thin is easy to split, and the too thick way of thickness is not penetrated and is welded, perhaps damages the sealing member easily when penetrating the energy of welding too big. The setting can be performed by those skilled in the art according to actual needs.

Further, as shown in FIG. 7, the groove 324 may have a groove width d in the range of 0.5mm to 2.5mm, and alternatively may have a thickness of 0.8mm, 1.2mm, 1.5mm, 1.8mm, or 2mm. The welding area may be annular around the through hole 321 or welding the protruding portion 32 and the plate body portion 21 by spot welding or sectional welding, so that a certain welding area needs to be achieved to ensure the welding effect, and the welding area may be set by a person skilled in the art according to actual needs.

In addition, as shown in fig. 8, the bottom plate 30 extends at least partially towards the region away from the bottom plate 30 and fixed to the column 22 to form an extension 33, and the length of the bottom plate 30 is made longer by the extension 33, so that the tab welding of the battery cell is facilitated. The setting can be performed by those skilled in the art according to actual needs.

In addition, as shown in fig. 2 and 5, the secondary battery cover plate assembly 1 further includes a first separator 40, a second separator 50, and a third separator 60. The first spacer 40 is clamped between the bottom surface of the cover main body 10 and the bottom plate 30. The second spacer 50 is fitted between the column portion 22 and the cap main body 10. The third spacer 60 is disposed between the top surface of the cover main body 10 and the plate body portion 21. The first, second and

third spacers

40, 50, 60 may be plastic or rubber.

While the preferred embodiments of the present invention have been described in detail above, it should be understood that aspects of the embodiments can be modified, if necessary, to employ aspects, features and concepts of the various patents, applications and publications to provide yet further embodiments.

These and other changes can be made to the embodiments in light of the above detailed description. In general, in the claims, the terms used should not be construed to be limited to the specific embodiments disclosed in the specification and the claims, but should be construed to include all possible embodiments along with the full scope of equivalents to which such claims are entitled.

Claims

1. A secondary battery cover plate assembly, comprising:

a cover plate body including an electrode lead-out hole;

the pole column body is provided with a plate body part and a column part protruding out of the plate body part, the plate body part is positioned on the top surface of the cover plate main body, and at least part of the column part is inserted into the electrode leading-out hole; the plate body part and the column body part are copper-aluminum composite integral parts; and

the bottom plate, the bottom plate sets up the bottom surface of apron main part, just the column part with the bottom plate is fixed links to each other.

2. The secondary battery cover plate assembly of claim 1, wherein the top surface of the plate body has a recessed area corresponding in position and shape to the post body.

3. The secondary battery cover plate assembly of claim 2, wherein the volume of the recessed region is greater than or equal to the volume of the column portion.

4. The secondary battery cover plate assembly of claim 1, wherein the plate body has a thickness in the range of 2mm to 6mm; the thickness of the column part ranges from 1mm to 3mm.

5. The secondary battery cover plate assembly of claim 1, wherein the base plate has a base plate body and a protrusion disposed on a top surface of the base plate body, and the protrusion has a through hole;

6. The secondary battery cover plate assembly of claim 5, wherein the projection is welded to both the plate portion and the column portion.

7. The secondary battery cover plate assembly of claim 6, wherein the bottom plate body is provided with an opening region;

8. The secondary battery cover plate assembly of claim 7, wherein a groove is formed in a side of the connecting top facing away from the plate body, and a groove wall of the groove opposite to the plate body is welded to the plate body.

9. The secondary battery cover plate assembly of claim 8, wherein the thickness of the recessed area formed in the connecting top is in the range of 0.5mm to 2mm.

10. The secondary battery cover plate assembly of claim 8, wherein the groove has a groove width in the range of 0.5mm to 2.5mm.

11. The secondary battery cover plate assembly of claim 1, wherein the base plate extends at least partially toward an area away from where the base plate is secured to the post portion to form an extension.

12. The secondary battery cover plate assembly of claim 1, further comprising:

a third spacer disposed between the top surface of the cover plate body and the plate body portion.

13. A battery, comprising:

the secondary battery cover plate assembly of any one of claims 1-12; and

and the electrode lug of the battery cell is connected with the bottom plate.