CN212648337U

CN212648337U - Lithium ion battery

Info

Publication number: CN212648337U
Application number: CN202021272987.XU
Authority: CN
Inventors: 崔云; 祝媛; 袁中直; 刘金成
Original assignee: Eve Energy Co Ltd
Current assignee: Eve Energy Co Ltd
Priority date: 2020-07-01
Filing date: 2020-07-01
Publication date: 2021-03-02
Anticipated expiration: 2030-07-01

Abstract

The utility model discloses a lithium ion battery, including casing and at least one subassembly that converges, the casing is formed by the sheetmetal punching press, and the casing includes the depressed part that forms through the punching press and the leveling part of being connected with one side of depressed part, and the leveling part can completely cover the depressed part and form the chamber that holds the core package after rolling over, has seted up at least one through-hole on the lateral wall of depressed part, and the subassembly that converges passes through the through-hole and is connected with the core package. The utility model discloses a lithium ion battery adopts the casing by sheetmetal stamping forming, can effectively reduce battery case's thickness to improve the energy density of battery. The number of parts is small, the assembly process flow is simple, the manufacturing period of the battery can be obviously shortened, the requirements of equipment, personnel and sites are reduced, and the manufacturing cost of the battery is reduced. In addition, related raw materials do not need to be imported, and the method is beneficial to localization.

Description

Lithium ion battery

Technical Field

The utility model relates to a battery manufacturing technology field especially relates to a lithium ion battery of easily assembling.

Background

The conventional soft package battery is thicker in thickness, lower in battery energy density, difficult to break through higher energy density, complex in battery assembly process flow, long in battery manufacturing period and low in production efficiency, and causes the problems that the battery is manufactured by multiple devices, needs more labor and occupies a larger place. In addition, the method has the defects of dependence on imported raw materials, high cost and no contribution to localization.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a lithium ion battery, it replaces the plastic-aluminum membrane with metal casing, and energy density is high, has simplified assembly process, has improved battery production efficiency, has reduced manufacturing cost.

To achieve the purpose, the utility model adopts the following technical proposal:

the utility model provides a lithium ion battery, includes casing and at least one subassembly that converges, the casing is formed by the sheetmetal punching press, the casing include through the punching press the depressed part that forms and with the planarization portion that one side of depressed part is connected, planarization portion can completely cover after turning over the book the depressed part and form the chamber that holds the core package, at least one through-hole has been seted up on the lateral wall of depressed part, the subassembly that converges passes through the through-hole with the core package is connected.

As an optimized scheme of the utility model, the subassembly that converges is including converging fluid, fixed shim and two insulating shim, two insulating shim sets up respectively the through-hole both sides, converge fluidic one end and pass two trompil on the insulating shim reaches the through-hole and with fixed shim connects.

As a preferred embodiment of the present invention, the size of the opening is smaller than the size of the through hole.

As a preferred embodiment of the present invention, the fluid collecting body is riveted to the fixing pad.

As an optimized proposal of the utility model, the concave part is also provided with a liquid injection hole.

As an optimized scheme of the utility model, the quantity of through-hole is two the through-hole is seted up the homonymy or the different sides of depressed part.

As a preferred scheme of the utility model, the edge of depressed part is provided with the flange, works as the flattening turns over a back, the edge of flattening with the flange laminating.

As a preferable aspect of the present invention, the edge of the flat portion is welded or bonded to the flange.

As a preferred scheme of the utility model, the sheetmetal is the rectangle.

The utility model has the advantages that:

the utility model discloses a lithium ion battery adopts the casing by sheetmetal stamping forming, can effectively reduce battery case's thickness to improve the energy density of battery. The number of parts is small, the assembly process flow is simple, the manufacturing period of the battery can be obviously shortened, the requirements of equipment, personnel and sites are reduced, and the manufacturing cost of the battery is reduced. In addition, related raw materials do not need to be imported, and the method is beneficial to localization.

Drawings

Fig. 1 is one of schematic perspective views of a lithium ion battery according to an embodiment of the present invention;

fig. 2 is a second schematic perspective view of a lithium ion battery according to an embodiment of the present invention;

fig. 3 is a third schematic perspective view of a lithium ion battery according to an embodiment of the present invention;

FIG. 4 is a side view of FIG. 1;

fig. 5 is a top view of fig. 1.

In the figure:

1. a housing; 11. a recessed portion; 12. a leveling section; 13. a through hole; 14. a flange; 15. a liquid injection hole; 2. a bus assembly; 21. a sink fluid; 22. an insulating spacer; 221. opening a hole; 23. and fixing the gasket.

Detailed Description

The technical solution of the present invention is further explained by the following embodiments with reference to the accompanying drawings.

In the present disclosure, unless expressly stated or limited otherwise, the first feature "on" or "under" the second feature may comprise direct contact between the first and second features, or may comprise contact between the first and second features not directly. Also, the word "over" a first feature or feature in a second feature may include the word "over" or "over" the second feature, or may simply indicate that the first feature is at a higher level than the second feature. A first feature "under" a second feature may include a first feature that is directly under and obliquely under the second feature, or may simply mean that the first feature is at a lesser elevation than the second feature.

As shown in fig. 1 to 5, the lithium ion battery of the present embodiment includes a housing 1 and two bus bar assemblies 2, the housing 1 is formed by punching a metal sheet, the housing 1 includes a concave portion 11 formed by punching and a flat portion 12 connected to one side of the concave portion 11, the flat portion 12 can completely cover the concave portion 11 after being folded, and form an accommodating cavity for accommodating a core package (not shown in the figure), two through holes 13 are opened on a side wall of the concave portion 11, and the bus bar assemblies 2 are connected to the core package through the through holes 13.

The lithium ion battery of the embodiment adopts the shell 1 formed by punching the metal sheet, and the metal sheet has higher strength, so that the thickness of the battery shell can be effectively reduced, and the energy density of the battery is improved. The number of parts is small, the assembly process flow is simple, the manufacturing period of the battery can be obviously shortened, the requirements of equipment, personnel and sites are reduced, and the manufacturing cost of the battery is reduced. In addition, related raw materials do not need to be imported, and the method is beneficial to localization.

In another embodiment, the number of the bus bar assemblies 2 is one, one pole of the core package is connected with the bus bar assemblies 2, and the other pole of the core package is connected with the shell 1 (the positive pole lug or the negative pole lug of the core package is welded on the shell 1), so that the cost of the battery can be further reduced. In this embodiment, an insulating film may be further coated on a part of the surface of the case 1, so that a specific region of the case 1, which is not coated by the insulating film, functions as a battery terminal, and the battery is prevented from being easily short-circuited due to the whole exposed surface of the case 1.

As shown in fig. 3, 4 and 5, preferably, the bus bar assembly 2 includes a bus bar 21, two insulating spacers 22 and a fixing spacer 23, the two insulating spacers 22 are respectively disposed at two sides of the through hole 13, and one end of the bus bar 21 passes through the opening 221 of the two insulating spacers 22 and the through hole 13 and is connected to the fixing spacer 23. Two insulating gaskets 22 are used for isolating the bus body 21 from the shell 1 to realize insulation, and the fixed gasket 23 is connected with the bus body 21 and then compresses the two insulating gaskets 22 to realize sealing. In some embodiments, an insulating sealant is further disposed between the insulating gasket 22 and the bus bar 21 and between the insulating gasket 22 and the housing 1 for improving the sealing property and the insulating property. Two collectors 21, one of which is a positive terminal and the other of which is a negative terminal, are connected to the core package.

Specifically, the size of the opening 221 is smaller than that of the through hole 13, so that the sink fluid 21 passes through the through hole 13 without contacting the wall of the through hole 13, thereby achieving insulation of the sink fluid 21 from the housing 1.

Preferably, the confluence body 21 is riveted with the fixing gasket 23, the insulating gasket 22 is usually made of plastics, the material of the insulating gasket can be one or more of PE (polyethylene), PP (polypropylene) and PET (polyethylene terephthalate), the confluence body 21 and the fixing gasket 23 are connected in a riveting mode, so that the confluence body 21 can be firmly fixed, rotation or displacement cannot occur, and damage to the insulating gasket 22 caused by welding heat during welding connection is avoided.

Preferably, the two through holes 13 are opened on the same side or different sides of the recess 11. According to the different structures of the battery core package, the opening positions of the two through holes 13 can be correspondingly adjusted, so that the connection difficulty between the core package and the bus assembly 2 is reduced, and the connection reliability is improved.

As shown in fig. 1, 2 and 5, it is preferable that the edge of the recess 11 is provided with a flange 14, and when the flat part 12 is folded, the edge of the flat part 12 is attached to the flange 14. The flange 14 has a certain area so as to facilitate the connection of the flat part 12 thereto, and ensure the sealability and reliability of the battery case after molding. Because a whole metal sheet is used as a processing raw material of the shell 1, the flat part 12 and the concave part 11 are always kept connected into a whole, so that the assembly of the battery is facilitated, and the assembly efficiency of the battery is improved.

Further, the edge of the flat part 12 is welded or bonded to the flange 14. The flange 14 has an area that can be selectively welded or adhesively attached to the planar portion 12.

As shown in fig. 1, the recessed portion 11 is preferably further provided with a liquid pouring hole 15. When the components of the battery are assembled, electrolyte can be injected into the accommodating cavity through the liquid injection hole 15 to perform subsequent processes such as formation, and the function of the liquid injection hole 15 can also be realized by the through hole 13 arranged on the shell 1, so that the process is simplified, the production efficiency is improved, and the cost is reduced. Further, the liquid injection hole 15 is formed in a position opposite to the extending direction of the tab of the core pack, so that the speed of infiltrating the core pack with the electrolyte is increased.

Preferably, the metal sheet is rectangular, so that the final shaped battery resembles the morphology of a pouch battery. The concave part 11 is close to the edge of the metal sheet, and the width of the flange 14 is not too large, so that the utilization rate of the metal sheet is improved while the sealing performance of the battery shell is ensured, and the manufacturing cost is reduced. After the flat part 12 is welded or bonded to the flange 14, the excess part may be further cut to control the size of the battery

As a preferred embodiment of the present invention, in the description of the present specification, reference to the description of the terms "preferred", "further" or the like means that a particular feature, structure, material, or characteristic described in connection with the example or illustration is included in at least one example or illustration of the present invention. In this specification, the schematic representations of the terms used above do not necessarily refer to the same embodiment or example. Furthermore, the particular features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

The above embodiments are only used to illustrate the detailed embodiments of the present invention, and the present invention is not limited to the above detailed embodiments, i.e. the present invention must not be implemented depending on the detailed embodiments. It should be clear to those skilled in the art that any improvement of the present invention, to the equivalent replacement of each raw material of the present invention, the addition of auxiliary components, the selection of specific modes, etc., all fall within the protection scope and disclosure scope of the present invention.

Claims

1. The utility model provides a lithium ion battery, its characterized in that, includes casing and at least one subassembly that converges, the casing is formed by the sheetmetal punching press, the casing include through the punching press the depressed part that forms and with the planarization portion that one side of depressed part is connected, the planarization portion can completely cover after turning over the book the depressed part and form the chamber that holds the core package, at least one through-hole has been seted up on the lateral wall of depressed part, the subassembly that converges passes through the through-hole with the core package is connected.

2. The lithium ion battery of claim 1, wherein the bus bar assembly comprises a bus bar, a fixing pad, and two insulating pads, the two insulating pads are respectively disposed on two sides of the through hole, and one end of the bus bar passes through the openings of the two insulating pads and the through hole and is connected to the fixing pad.

3. The lithium ion battery of claim 2, wherein the size of the opening is smaller than the size of the through hole.

4. The lithium ion battery of claim 2, wherein the bus fluid is riveted to the retention washer.

5. The lithium ion battery of claim 1, wherein the recessed portion further defines a liquid injection hole.

6. The lithium ion battery of claim 1, wherein the number of the through holes is two, and the two through holes are arranged on the same side or different sides of the recessed portion.

7. The lithium ion battery of claim 1, wherein the edge of the recess is provided with a flange, and when the flat portion is folded, the edge of the flat portion is attached to the flange.

8. The lithium ion battery of claim 7, wherein an edge of the flattened portion is welded or bonded to the flange.

9. The lithium ion battery of claim 1, wherein the metal sheet is rectangular.