Lithium ion battery
By using a hollow terminal block and an integrated aluminum shell structure, the problems of insufficient overcurrent capacity and poor external insulation performance of lithium-ion batteries during fast charging are solved, achieving high integration and excellent external insulation performance, thus meeting the requirements of electric vehicles for long range and fast charging.
Patent Information
- Application Number
- CN202423087038.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-13
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-13
AI Technical Summary
Existing lithium-ion batteries suffer from insufficient overcurrent capacity and poor external insulation performance during fast charging, and traditional designs are difficult to meet the requirements of electric vehicles for long range and fast charging.
It adopts a hollow pole design and improves current carrying capacity and external insulation performance through one-piece molded aluminum shell structure, welding of pole tabs and electrode pressure plates, limiting steel rings and insulation layer spraying.
It achieves high integration, strong overcurrent capability and excellent external insulation performance of lithium-ion batteries, meets the fast charging requirements of electric vehicles, and improves space utilization and simplifies assembly.
Smart Images
Figure CN223651608U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to the technical field of new energy power battery, especially lithium ion battery. BACKGROUND
[0002] With the continuous development of electric vehicles, people's requirements for electric vehicles are also higher and higher. Not only should the electric vehicle have a cruising range of more than 700Km, but also the electric vehicle should be able to charge for 10 minutes and have a cruising range of 400Km+. This puts new challenges on the design and process of traditional battery structure.
[0003] The improvement of battery fast charging requirements means that the heat generated inside the battery will be higher, and the overcurrent capacity of the battery structure needs to meet the requirements. In addition, in order to meet the overcurrent capacity in the battery process, a larger area of the pole is required, but the size of the battery is limited. In addition, the development of ctp technology puts higher requirements on the performance of the outer insulation of the battery cell. SUMMARY
[0004] In view of the above problems existing in the existing battery, the present application aims to provide a lithium ion battery with high integration, strong overcurrent capacity and good outer insulation performance.
[0005] The specific technical scheme is as follows:
[0006] A lithium ion battery comprises: a shell and a battery cell arranged in the shell, the shell has two pole openings, each pole opening is provided with a pole, each pole is a hollow structure with an upper opening and a lower opening, and the top opening of each pole is provided with an electrode pressing plate, the battery cell has two pole lugs, and the two pole lugs pass through the two poles and are connected to the two electrode pressing plates respectively.
[0007] As a further improvement and optimization of the present application, the shell is an aluminum shell, which comprises a shell body with an open bottom and a bottom plate matched and welded to the open bottom of the shell body, the two pole openings are arranged on the shell body, and the shell body is an integral molding structure.
[0008] As a further improvement and optimization of the present application, the two pole lugs are welded to the two electrode pressing plates respectively.
[0009] As a further improvement and optimization of the present application, the two electrode pressing plates are a positive electrode pressing plate and a negative electrode pressing plate respectively, and the positive electrode pressing plate is a positive electrode aluminum plate.
[0010] Among them, the negative electrode pressing plate comprises a negative electrode aluminum plate and a negative electrode copper plate arranged at the bottom of the negative electrode aluminum plate, one of the pole lugs is welded to the positive electrode aluminum plate, and the other pole lug is welded to the negative electrode copper plate.
[0011] As further improvement and optimization of the scheme, the top opening of the two said electrode ports is provided with a limiting pressure groove, the circumferential side of the two said electrode pressing plates is extended with a limiting extension edge, and the two said limiting extension edges are respectively limitedly matched with the groove bottom of the two said limiting pressure grooves.
[0012] As further improvement and optimization of the scheme, the outside of each said pole column is sleeved with a limiting steel ring, and the top outer wall of each said pole column is formed with a riveting flange, the top of the limiting steel ring is limitedly matched with the riveting flange, and the bottom is limitedly matched with the top of the shell.
[0013] As further improvement and optimization of the scheme, a limiting block is further arranged between the pole column and the inner wall of the electrode port, and the limiting block is sleeved on the outside of the pole column.
[0014] As further improvement and optimization of the scheme, a first sealing ring is further arranged between the pole column and the electrode port.
[0015] As further improvement and optimization of the scheme, the bottom plate is provided with an electrolyte injection port.
[0016] As further improvement and optimization of the scheme, the inner and outer walls of the shell and the limiting steel ring are sprayed with an insulating layer.
[0017] The above technical scheme has the following positive effects compared with the prior art:
[0018] In the utility model, the pole column is designed as a hollow structure, the flow bottleneck of the pole column is eliminated, and the demand of fast charging is met.
[0019] In the utility model, the shell is integrally formed, the structure is simplified, and the space utilization is improved.
[0020] In the utility model, the inner and outer walls of the shell are sprayed with an insulating layer, the design of spraying insulation simplifies assembly, simplifies the structure, and improves the insulation effect. DRAWINGS
[0021] Figure 1 It is a structural schematic view of the lithium ion battery;
[0022] Figure 2 It is a front view of the lithium ion battery;
[0023] Figure 3 It is an enlarged view of the A-A section of the lithium ion battery;
[0024] Figure 4 It is an enlarged view of the B-B section of the lithium ion battery;
[0025] Figure 5The utility model relates to a lithium ion battery's electrolyte injection port plugging structure schematic diagram shows,
[0026] In the drawing, 1 is a shell, 2 is an electrode pressing plate, 3 is an electric core, 4 is a pole, 5 is a limiting steel ring, 6 is a limiting block, 7 is a first sealing ring, 8 is a second sealing ring, 11 is a shell, 12 is a bottom plate, 13 is a sealing glue nail, 14 is a sealing aluminum sheet, 21 is a negative pole aluminum plate, 22 is a negative pole copper plate, 31 is a tab, 41 is a negative pole aluminum column, 42 is a negative pole copper column, 43 is a riveting flange, 111 is a pole mouth, 121 is an electrolyte injection port. DETAILED DESCRIPTION
[0027] The technical scheme of the utility model will be described below in conjunction with the drawings, obviously, the described embodiment is a part of the embodiment of the utility model, not all the embodiment. Based on the embodiment in the utility model, all other embodiments obtained by the ordinary skill in the art without making creative labor belong to the scope of the utility model protection.
[0028] In the description of the utility model, it needs to be explained that, if the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like appear, the indicated orientation or position relation is based on the orientation or position relation shown in the drawing, only for the convenience of describing the utility model and simplifying the description, and cannot be understood as indicating or implying that the indicated device or element must have a particular orientation, be constructed and operated in a particular orientation, therefore, cannot be understood as limiting the utility model. In addition, if the terms "first", "second", "third" appear, they are only for the purpose of description, and cannot be understood as indicating or implying relative importance.
[0029] In the description of the utility model, it needs to be explained that, unless otherwise explicitly specified and limited, if the terms "mounting", "connecting", "connection" appear, they should be understood in a broad sense, for example, can be fixedly connected, or can be detachably connected, or integrally connected, can be mechanically connected, or can be electrically connected, can be directly connected, or indirectly connected through an intermediate medium, or the communication inside two elements. For the ordinary skill in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.
[0030] Figure 1 The utility model relates to a lithium ion battery's structure schematic diagram, Figure 2 The utility model relates to a lithium ion battery's front view, Figure 3 The utility model relates to a lithium ion battery's A-A cross section partial enlarged view, Figure 4 The utility model relates to a lithium ion battery's B-B cross section partial enlarged view, Figure 5This is a schematic diagram of a sealing structure for the electrolyte injection port of a lithium-ion battery according to the present invention. Figures 1-5 The image shows a preferred embodiment of a lithium-ion battery with an integrated structural component and an internally and externally insulated hollow terminal post 4, comprising: a housing 1 and a cell 3 disposed within the housing 1. The housing 1 has two electrode openings 111, and each electrode opening 111 is provided with a terminal post 4. Each terminal post 4 is a hollow structure with openings at both the top and bottom ends. Each terminal post 4 has an electrode pressure plate 2 at its top opening. The cell 3 has two tabs 31, which pass through the two terminal posts 4 and are respectively connected to the two electrode pressure plates 2.
[0031] In this embodiment, by adopting a hollow design for the electrode post 4, the current bottleneck of the electrode post 4 is eliminated, thereby meeting the requirements of fast charging.
[0032] As a further improvement and optimization of this solution, the outer shell 1 is an aluminum shell, which includes a shell 11 with a bottom opening and a base plate 12 that is matched and welded to the bottom opening of the shell 11. Both pole ports 111 are located on the shell 11, and the shell 11 is an integrally formed structure, which simplifies the structural components and improves the space utilization.
[0033] As a further improvement and optimization of this scheme, the two tabs 31 are welded to the two electrode plates 2 respectively.
[0034] As a further improvement and optimization of this scheme, the two electrode plates 2 are the positive electrode plate and the negative electrode plate, respectively, and the positive electrode plate is a positive aluminum plate;
[0035] The negative electrode plate includes a negative electrode aluminum plate 21 and a negative electrode copper plate 22 disposed at the bottom of the negative electrode aluminum plate 21. One electrode tab 31 is welded to the positive electrode aluminum plate, and the other electrode tab 31 is welded to the negative electrode copper plate 22.
[0036] Furthermore, the two poles 4 are a positive pole 4 and a negative pole 4, respectively. The positive pole 4 is a positive copper pole, and the negative pole 4 includes a negative copper pole 42 and a negative aluminum pole 41 disposed at the bottom of the negative copper pole 42.
[0037] Even better, a second sealing ring 8 is provided between the negative electrode copper plate 22 and the inner wall of the corresponding electrode port 111.
[0038] As a further improvement and optimization of this solution, both pole ports 111 have limiting grooves at their top openings, and both electrode plates 2 have limiting edges extending around their periphery. The two limiting edges are respectively matched with the bottom of the two limiting grooves for limiting.
[0039] As a further improvement and optimization of this solution, each pole post 4 is fitted with a limiting steel ring 5, and the top outer wall of each pole post 4 is formed with a riveted flange 43. The top of the limiting steel ring 5 is matched with the riveted flange 43, and the bottom is matched with the top of the outer shell 1.
[0040] Furthermore, the surface of each limiting steel ring 5 is coated with a heat-resistant coating.
[0041] As a further improvement and optimization of this solution, a limiting block 6 is provided between the inner wall of the pole post 4 and the pole opening 111, and the limiting block 6 is sleeved on the outside of the pole post 4.
[0042] As a further improvement and optimization of this solution, a first sealing ring 7 is also provided between the pole post 4 and the pole port 111.
[0043] As a further improvement and optimization of this solution, the base plate 12 has an electrolyte injection port 121.
[0044] Furthermore, the electrolyte injection port 121 is sealed by a sealing aluminum sheet 14 and a sealing nail 13.
[0045] As a further improvement and optimization of this solution, the inner and outer walls of the shell 11 and the limiting steel ring 5 are all coated with an insulating and heat-resistant layer. The design of spraying insulation simplifies assembly, simplifies structural components, and improves insulation performance.
[0046] In a preferred embodiment, the insulating layer may be a UV insulating coating, a nano insulating coating, or the like.
[0047] Furthermore, cell 3 is either stacked or wound.
[0048] The above description is only a preferred embodiment of the present utility model and does not limit the implementation method and protection scope of the present utility model. Those skilled in the art should realize that all solutions obtained by equivalent substitutions and obvious changes made based on the description and illustrations of the present utility model should be included within the protection scope of the present utility model.
Claims
1. A lithium-ion battery, characterized in that, include: The battery has a housing and a battery cell disposed within the housing. The housing has two terminals, each terminal has a terminal post, each terminal post is a hollow structure with openings at both the top and bottom, and each terminal post has an electrode pressure plate at its top opening. The battery cell has two tabs, each tab passing through the two terminals and connected to the two electrode pressure plates.
2. The lithium-ion battery according to claim 1, characterized in that, The outer shell is an aluminum shell, which includes a shell with a bottom opening and a base plate that is matched and welded to the bottom opening of the shell. Both of the electrode ports are located on the shell, and the shell is an integrally formed structure.
3. The lithium-ion battery according to any one of claims 1-2, characterized in that, The two tabs are respectively welded to the two electrode plates.
4. The lithium-ion battery according to claim 3, characterized in that, The two electrode plates are a positive electrode plate and a negative electrode plate, respectively, and the positive electrode plate is a positive aluminum plate; The negative electrode plate includes a negative aluminum plate and a negative copper plate disposed at the bottom of the negative aluminum plate, wherein one of the electrodes is welded to the positive aluminum plate and the other electrode is welded to the negative copper plate.
5. The lithium-ion battery according to claim 3, characterized in that, Both of the electrode ports have a limiting groove at their top openings, and both of the electrode plates have a limiting edge extending from their periphery. The limiting edges are respectively limited and engaged with the bottom of the limiting grooves.
6. The lithium-ion battery according to claim 2, characterized in that, Each of the pole posts is fitted with a limiting steel ring on its exterior, and a riveted flange is formed on the top outer wall of each pole post. The top of the limiting steel ring is matched with the riveted flange, and the bottom is matched with the top of the outer shell.
7. The lithium-ion battery according to claim 6, characterized in that, A limiting block is also provided between the pole post and the inner wall of the pole opening, and the limiting block is sleeved on the outside of the pole post.
8. The lithium-ion battery according to claim 7, characterized in that, A first sealing ring is also provided between the pole post and the pole port.
9. The lithium-ion battery according to claim 2, characterized in that, The base plate has an electrolyte injection port.
10. The lithium-ion battery according to claim 6, characterized in that, The inner and outer walls of the housing and the limiting steel ring are coated with an insulating layer.