Lithium ion battery lower plastic part, lithium ion battery top cover and battery system

Abstract

The utility model provides a lithium ion battery lower plastic part, a lithium ion battery top cover and a battery system, the lithium ion battery lower plastic part comprises a lower plastic part body, a middle protruding structure and a liquid injection port, and the middle protruding structure and the liquid injection port are both arranged at the bottom of the lower plastic part body; the outer side face of the middle protruding structure is connected with one end of a baffle, the other end of the baffle extends to the position under the liquid injection opening, and the other end of the baffle shields the liquid injection opening. In the lower plastic part of the lithium ion battery, due to the arrangement of the baffle, the electrolyte can be blocked by the baffle when the electrolyte under external pressure is injected, so that the electrolyte can conform to the baffle and flow out to the periphery of the baffle, and the problems of deformation, wrinkling and the like of a pole piece caused by direct impact of the electrolyte on a roll core are avoided; therefore, the electrolyte injection efficiency can be improved, the infiltration effect in the roll core can be ensured, and a pole piece interface can still be ensured not to be damaged even if electrolyte injection is performed under high pressure; the lower plastic part of the lithium ion battery is simple in structure and does not need additional installation.

Description

Technical Field

[0001] The utility model relates to the technical field of lithium-ion batteries, in particular to a lithium-ion battery lower plastic part, a lithium-ion battery top cover and a battery system. Background Art

[0002] In lithium-ion batteries, an aluminum shell is provided under the top cover, and a winding core is provided inside the aluminum shell. A liquid injection port is provided on the top cover. When the electrolyte is injected into the liquid injection port through high pressure, the electrolyte will impact the winding core, and the pole pieces in the winding core will be deformed or wrinkled. A blocking component is installed on the liquid injection port. The blocking component includes a bottom baffle and a side structure extending upward along the circumference of the bottom baffle. The bottom baffle covers the liquid injection port, and the side structure is provided with a plurality of drainage holes, which causes the electrolyte to spray out from the drainage holes, that is, to diffuse from all sides of the liquid injection port. The blocking component needs to be installed additionally, which is relatively cumbersome. How to design a structure that has a simple structure, does not require additional installation, and can prevent the electrolyte from directly impacting the winding core is a problem that needs to be solved by those skilled in the art. Utility Model Content

[0003] In view of the shortcomings of the existing technology mentioned above, the technical problem solved by the present invention is to provide a lithium-ion battery lower plastic part, a lithium-ion battery top cover and a battery system with a simple structure, no need for additional installation, and the ability to prevent the electrolyte from directly impacting the winding core.

[0004] To achieve the above-mentioned and other related purposes, the present invention provides a lithium-ion battery lower plastic part, which is arranged on the top cover of the lithium-ion battery; comprising: a lower plastic part body, a middle protruding structure and a liquid injection port, wherein the middle protruding structure and the liquid injection port are both arranged at the bottom of the lower plastic part body;

[0005] The distance between the lower end of the liquid injection port and the bottom surface of the lower plastic part body is smaller than the distance between the bottom surface of the middle protruding structure and the bottom surface of the lower plastic part body; the outer side surface of the middle protruding structure is connected to one end of the baffle, and the other end of the baffle extends to directly below the liquid injection port, and the other end of the baffle blocks the liquid injection port.

[0006] Preferably, the bottom surface of the lower plastic part body is connected to the top surface of a connecting column, and the bottom surface of the connecting column is connected to the top surface of the baffle.

[0007] Preferably, the distance between the bottom surface of the central protruding structure and the bottom surface of the lower plastic body is greater than or equal to 3 mm, and the distance between the bottom surface of the central protruding structure and the bottom surface of the lower plastic body is less than or equal to 5 mm.

[0008] Preferably, the bottom of the lower plastic body is further provided with two end protruding structures, and the two end protruding structures are located at both ends of the lower plastic body in the length direction;

[0009] Each of the end protruding structures has two oppositely disposed end length-facing side surfaces, the two end length-facing side surfaces extending along the length direction of the lower plastic body; each of the end length-facing side surfaces is provided with a hot melting point portion;

[0010] The side of each end protruding structure away from the other end protruding structure is an end width side, and each end width side is provided with a hot melting point portion;

[0011] The central protruding structure has two oppositely arranged central length side surfaces, and the two central length side surfaces extend along the length direction of the lower plastic component body; each of the central length side surfaces is provided with a hot melting point portion.

[0012] The utility model also relates to a lithium-ion battery top cover, comprising: the lithium-ion battery lower plastic part.

[0013] The utility model also relates to a battery system, comprising: the lithium-ion battery top cover.

[0014] As described above, the lithium-ion battery lower plastic part, lithium-ion battery top cover and battery system of the present invention have the following beneficial effects:

[0015] In the lower plastic part of the lithium-ion battery, the setting of the baffle can ensure that when the electrolyte is injected under external pressure, the baffle can block the electrolyte, and the electrolyte can flow out around the baffle to prevent the electrolyte from directly impacting the winding core and causing problems such as deformation and wrinkling of the electrode. This can improve the efficiency of electrolyte injection and ensure the infiltration effect inside the winding core. Even under high pressure, the injection can still ensure that the electrode interface is not damaged. The lower plastic part of the lithium-ion battery has a simple structure and does not require additional installation. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 Shown is a schematic diagram of the three-dimensional structure of the lower plastic part of the lithium-ion battery of this embodiment.

[0017] Figure 2 Shown is a schematic side structural diagram of the lower plastic part of the lithium-ion battery of this embodiment.

[0018] Figure 3 Shown is a schematic diagram of the bottom structure of the lower plastic part of the lithium-ion battery of this embodiment.

[0019] Explanation of Figure Numbers

[0020] 100 lower plastic part body

[0021] 200 Central protruding structure

[0022] 210 middle length to the side

[0023] 300 Liquid injection port

[0024] 400 end protruding structure

[0025] 410 end length to the side

[0026] 420 end width to the side

[0027] 500 Melting Point

[0028] 2 baffles

[0029] 3 Connecting column DETAILED DESCRIPTION

[0030] The following describes the implementation of the present invention through specific embodiments. People familiar with this technology can easily understand other advantages and effects of the present invention from the content disclosed in this specification.

[0031] Please refer to the accompanying drawings. It should be noted that the structures, proportions, sizes, etc. illustrated in the drawings of this specification are only used to match the contents disclosed in the specification for people familiar with this technology to understand and read, and are not used to limit the limiting conditions for the implementation of this utility model. Therefore, they have no substantial technical significance. Any modification of the structure, change in the proportional relationship or adjustment of the size should still fall within the scope of the technical content disclosed in this utility model without affecting the efficacy and purpose that can be achieved by this utility model. At the same time, the terms such as "upper", "lower", "left", "right", "middle" and "one" quoted in this specification are only for the convenience of description and are not used to limit the scope of the implementation of this utility model. Changes or adjustments in their relative relationships should also be regarded as the scope of the implementation of this utility model without substantially changing the technical content.

[0032] like Figures 1 to 3 As shown, the lower plastic part of the lithium-ion battery of this embodiment includes: a lower plastic part body 100, a middle protruding structure 200 and a liquid injection port 300, and the middle protruding structure 200 and the liquid injection port 300 are both arranged at the bottom of the lower plastic part body 100;

[0033] The distance between the lower end of the liquid injection port 300 and the bottom surface of the lower plastic body 100 is smaller than the distance between the bottom surface of the middle protruding structure 200 and the bottom surface of the lower plastic body 100; the outer side surface of the middle protruding structure 200 is connected to one end of the baffle 2, and the other end of the baffle 2 extends to directly below the liquid injection port 300, and the other end of the baffle 2 blocks the liquid injection port 300.

[0034] In the lower plastic part of the lithium-ion battery, the setting of the baffle 2 can ensure that when the electrolyte subjected to external pressure is injected, the baffle 2 can block the electrolyte, and the electrolyte can follow the baffle 2 and flow out around the baffle 2, avoiding the electrolyte directly impacting the winding core, which causes problems such as deformation and wrinkling of the electrode. This can improve the efficiency of electrolyte injection and ensure the infiltration effect inside the winding core, and even under high pressure, the injection can still ensure that the electrode interface is not damaged; the lower plastic part of the lithium-ion battery has a simple structure and does not require additional installation.

[0035] The bottom surface of the lower plastic body 100 is connected to the top surface of a connecting post 3, which in turn is connected to the top surface of the baffle 2. The connecting post 3 provides support, allowing the baffle 2 to withstand the significant impact of electrolyte flow and prevent deformation. In this embodiment, the connecting post 3 is located in the middle of the baffle 2, which helps the baffle 2 withstand greater pressure.

[0036] The spacing between the bottom surface of the central protrusion 200 and the bottom surface of the lower plastic body 100 is greater than or equal to 3 mm, and the spacing between the bottom surface of the central protrusion 200 and the bottom surface of the lower plastic body 100 is less than or equal to 5 mm. The central protrusion 200 corresponds to the pressure relief area of ​​the explosion-proof valve. The spacing between the bottom surface of the central protrusion 200 and the bottom surface of the lower plastic body 100 is within a range that prevents interference between the battery cells and the vent area, prevents diaphragm compression and poor wetting, and improves electrolyte wetting. In this embodiment, the spacing between the bottom surface of the central protrusion 200 and the bottom surface of the lower plastic body 100 is 4 mm.

[0037] The bottom of the lower plastic body 100 is further provided with two end protruding structures 400, and the two end protruding structures 400 are located at both ends of the length direction of the lower plastic body 100;

[0038] Each end protrusion structure 400 has two oppositely disposed end length-facing side surfaces 410 , which extend along the length direction of the lower plastic body 100 ; each end length-facing side surface 410 is provided with a hot melt portion 500 ;

[0039] The side of each end protruding structure 400 away from the other end protruding structure 400 is an end width side surface 420 , and each end width side surface 420 is provided with a hot melting point portion 500 ;

[0040] The central protrusion 200 has two opposing mid-length side surfaces 210 extending along the length of the lower plastic body 100. Each mid-length side surface 210 is provided with a hot melt portion 500. These hot melt portions 500 are the Mylar hot melt areas. Multiple hot melt portions 500 facilitate the hot melt process.

[0041] The lithium-ion battery top cover of this embodiment includes a lithium-ion battery lower plastic part. The lithium-ion battery top cover can withstand a large impact of the electrolyte without causing deformation of the electrode.

[0042] The battery system of this embodiment includes: a lithium-ion battery top cover.

[0043] The above embodiments are merely illustrative of the principles and effects of the present invention and are not intended to limit the present invention. Anyone skilled in the art may modify or alter the above embodiments without departing from the spirit and scope of the present invention. Therefore, all equivalent modifications or alterations made by one of ordinary skill in the art without departing from the spirit and technical principles disclosed in the present invention are intended to be covered by the claims of the present invention.

Claims

1. A lower plastic part of a lithium-ion battery, arranged on a top cover of the lithium-ion battery; characterized in that: include: A lower plastic body (100), a middle protruding structure (200) and a liquid injection port (300), wherein the middle protruding structure (200) and the liquid injection port (300) are both arranged at the bottom of the lower plastic body (100); The distance between the lower end of the liquid injection port (300) and the bottom surface of the lower plastic body (100) is smaller than the distance between the bottom surface of the middle protruding structure (200) and the bottom surface of the lower plastic body (100); The outer side surface of the central protruding structure (200) is connected to one end of the baffle (2), and the other end of the baffle (2) extends to directly below the liquid injection port (300), and the other end of the baffle (2) blocks the liquid injection port (300).

2. The lithium-ion battery lower plastic part according to claim 1, characterized in that: The bottom surface of the lower plastic part body (100) is connected to the top surface of a connecting column (3), and the bottom surface of the connecting column (3) is connected to the top surface of the baffle (2).

3. The lithium-ion battery lower plastic part according to claim 1, characterized in that: The distance between the bottom surface of the central protruding structure (200) and the bottom surface of the lower plastic body (100) is greater than or equal to 3 mm, and the distance between the bottom surface of the central protruding structure (200) and the bottom surface of the lower plastic body (100) is less than or equal to 5 mm.

4. The lithium-ion battery lower plastic part according to claim 1, characterized in that: The bottom of the lower plastic body (100) is further provided with two end protruding structures (400), and the two end protruding structures (400) are located at both ends of the lower plastic body (100) in the length direction; Each of the end protruding structures (400) has two oppositely disposed end length-facing side surfaces (410), and the two end length-facing side surfaces (410) extend along the length direction of the lower plastic body (100); each of the end length-facing side surfaces (410) is provided with a hot melting point portion (500); The side of each end protruding structure (400) away from another end protruding structure (400) is an end width side surface (420), and each end width side surface (420) is provided with a hot melting point portion (500); The central protruding structure (200) has two oppositely arranged central length side surfaces (210), and the two central length side surfaces (210) extend along the length direction of the lower plastic part body (100); each of the central length side surfaces (210) is provided with a hot melting point portion (500).

5. A lithium-ion battery top cover, comprising: The lower plastic part of a lithium-ion battery according to any one of claims 1 to 4.

6. A battery system comprising: The lithium-ion battery top cover as claimed in claim 5.

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