Lithium ion battery

Abstract

The utility model provides a lithium ion battery, which relates to the technical field of button type lithium ion batteries and comprises a cover plate assembly, a roll core assembly and a shell, an upper opening is formed in the shell, and the roll core assembly is arranged in the shell; the cover plate assembly is arranged at the upper opening and is welded with the shell; a heat insulation assembly is arranged on the side, facing the cover plate assembly, of the roll core assembly. According to the lithium ion battery provided by the utility model, the heat insulation assembly is arranged on the roll core assembly, and the heat insulation assembly is arranged on one side, facing the cover plate assembly, of the roll core assembly; the heat insulation assembly effectively avoids the problems of diaphragm scald, damage to the structure of the roll core assembly and short circuit caused by heat generated by rapid temperature rise to a melting point after laser beams irradiate the surface of the material to absorb energy in the welding process, and is beneficial to ensuring the safety performance of the lithium ion battery.

Description

Technical Field

[0001] The utility model relates to the technical field of button-type lithium-ion batteries, in particular to a lithium-ion battery. Background Art

[0002] In recent years, with the rise of wearable products, the demand for miniaturization, diversification, and long battery life of battery products has become increasingly obvious; this requires that while ensuring product performance, the actual internal utilization space of battery products should be increased as much as possible, thereby increasing energy density.

[0003] Steel shell button battery, also known as button battery, refers to a battery with a button-like appearance. Steel shell button battery is generally composed of a cover assembly and an outer shell. The cover assembly includes a cover sheet. The cover sheet and the outer shell are welded to form a battery shell. The winding core is located in the battery shell. The battery shell is a sealed structure with good sealing stability and available space inside the shell. However, during the welding process, the laser beam irradiates the surface of the outer shell material and absorbs energy. The temperature rises rapidly to the melting point. The heat generated can easily burn the diaphragm, causing it to shrink, causing the anode and cathode to contact and cause a short circuit, ultimately reducing the safety performance of the steel shell button battery. Utility Model Content

[0004] The utility model aims to provide a lithium-ion battery to alleviate the technical problem in the prior art that when a cover plate assembly is welded to a shell, the diaphragm is easily scalded, the diaphragm shrinks, and the cathode and anode contact and cause a short circuit.

[0005] The utility model provides a lithium ion battery, comprising a cover plate assembly, a winding core assembly and a shell; the shell is provided with an upper opening, and the winding core assembly is arranged in the shell;

[0006] The cover plate assembly is arranged at the upper opening and welded to the shell; a heat insulation assembly is arranged on a side of the winding core assembly facing the cover plate assembly.

[0007] In an optional embodiment, the winding core assembly includes a winding core body and a negative electrode tab disposed on the winding core body, and the negative electrode tab is connected to the bottom of the shell after being bent;

[0008] An insulating base pad is provided between the negative electrode tab and the winding core body.

[0009] In an optional embodiment, the insulating base pad has a through hole, and the through hole is arranged concentrically with the winding core hole of the winding core body.

[0010] In an optional embodiment, the winding core assembly further includes a positive electrode tab, one end of which is disposed on the winding core body;

[0011] The positive electrode tab is bent and then bent in the reverse direction and connected to the cover plate assembly.

[0012] In an optional embodiment, the cover plate assembly includes a cover plate body and a positive electrode post disposed on the cover plate body; the positive electrode tab is connected to the positive electrode post.

[0013] In an optional embodiment, the positive electrode post includes a post body and a connecting plate, the post body is passed through the cover plate body, and the connecting plate is arranged on the post body;

[0014] The heat insulation component is in the shape of a ring, an assembly hole is provided in the middle of the heat insulation component, and the positive electrode tab is connected to the connecting plate through the assembly hole.

[0015] In an optional embodiment, the outer diameter of the thermal insulation component is greater than the inner diameter by more than 1 mm.

[0016] In an optional embodiment, the thickness of the thermal insulation component is less than or equal to 0.2 mm.

[0017] In an optional embodiment, a mounting hole is provided on the cover plate body, a sealing ring is sleeved on the pole body, and the sealing ring is arranged in the mounting hole.

[0018] In an optional embodiment, the thermal insulation component is made of one of insulating plastic, insulating ceramic and insulating glass.

[0019] The utility model provides a heat insulation component on the winding core assembly of the lithium-ion battery, and the heat insulation component is arranged on the side of the winding core assembly facing the cover assembly. When the cover assembly and the shell are laser welded, the heat insulation component effectively prevents the diaphragm from being burned by the heat generated when the temperature rises rapidly to the melting point after the laser beam is irradiated to the surface of the material to absorb energy during the welding process, thereby preventing the winding core assembly structure from being destroyed and causing a short circuit, which is beneficial to ensuring the safety performance of the lithium-ion battery. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0021] Figure 1 A schematic diagram of the structure of a lithium-ion battery provided in an embodiment of the utility model;

[0022] Figure 2 for Figure 1A schematic structural diagram of a cover assembly of a lithium-ion battery shown;

[0023] Figure 3 for Figure 1 A schematic structural diagram of a cover plate assembly of a lithium-ion battery shown in another angle.

[0024] Icon: 100-winding core body; 200-positive pole ear; 300-negative pole ear; 500-cover assembly; 600-shell; 700-upper opening; 800-insulating base pad; 900-through hole; 110-thermal insulation assembly; 120-assembly hole; 130-cover body; 140-pole body; 150-connecting plate. DETAILED DESCRIPTION

[0025] The terms “first”, “second”, “third”, etc. are only used for distinguishing descriptions and do not indicate the order of arrangement, nor can they be understood as indicating or implying relative importance.

[0026] In addition, the terms "horizontal", "vertical", "overhanging" and the like do not mean that the components are required to be absolutely horizontal or overhanging, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0027] In the description of the present application, it should be noted that the terms "inside", "outside", "left", "right", "up", "down", etc. indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings, or are directions or positional relationships in which the products of the present application are usually placed when in use. They are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore should not be understood as a limitation on the present application.

[0028] In the description of this application, unless otherwise clearly specified and limited, the terms "set", "installed", "connected" and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, and it can be the internal connection of two elements.

[0029] The technical solution of the present application will be described clearly and completely below in conjunction with the accompanying drawings.

[0030] Reference Figure 1-Figure 3 The utility model provides a lithium-ion battery, comprising a cover plate assembly 500, a winding core assembly and a shell 600; the shell 600 is provided with an upper opening 700, and the winding core assembly is arranged in the shell 600;

[0031] The cover plate assembly 500 is disposed at the upper opening 700 and welded to the shell 600 ; a heat insulation assembly 110 is disposed on a side of the winding core assembly facing the cover plate assembly 500 .

[0032] In some embodiments, the lithium-ion battery includes a shell 600 and a cover plate assembly 500, the shell 600 has an upper opening 700, and the core assembly is assembled into the shell 600 from the upper opening 700; a heat insulation assembly 110 is arranged on the core assembly, and the heat insulation assembly 110 is located on the end surface of the core assembly facing the cover plate assembly 500; when the cover plate assembly 500 and the shell 600 are laser welded, during the welding process, the laser beam is irradiated to the surface of the shell material and absorbs energy, and the temperature rises rapidly to the melting point. The heat generated can easily burn the diaphragm, causing the diaphragm to shrink, causing the anode and cathode to contact and cause a short circuit, thereby reducing the safety of the lithium-ion battery.

[0033] When the heat insulating component 110 is disposed on the winding core component, the heat insulating component 110 plays a heat insulating role, so that the heat cannot be transferred to the winding core component, that is, the diaphragm will not shrink, thereby ensuring the safety performance and service life of the lithium-ion battery.

[0034] In an optional embodiment, the winding core assembly includes a winding core body 100 and a negative electrode tab 300 disposed on the winding core body 100 , and the negative electrode tab 300 is connected to the bottom of the shell 600 after being bent;

[0035] An insulating base gasket 800 is disposed between the negative electrode tab 300 and the winding core body 100 .

[0036] In an optional implementation, a through hole 900 is provided on the insulating base pad 800 , and the through hole 900 is arranged concentrically with the winding core hole of the winding core body 100 .

[0037] In some embodiments, a negative electrode tab 300 is provided on the core body 100 of the core assembly, and generally, the negative electrode tab 300 is wrapped with insulating tape so that only one end of the negative electrode tab 300 is exposed; the exposed end of the negative electrode tab 300 is welded to the bottom of the shell 600, thereby realizing the connection between the negative electrode tab 300 and the shell 600.

[0038] An insulating base gasket 800 is provided between the negative electrode tab 300 and the winding core body 100 . The insulating base gasket 800 prevents the negative electrode tab 300 from directly contacting the winding core body 100 , thereby preventing a short circuit between the negative electrode tab 300 and the winding core body 100 .

[0039] In order to facilitate the flow of electrolyte, a through hole 900 is provided on the insulating base pad 800 and is arranged concentrically with the winding core hole of the winding core body 100 , which is conducive to the contact between the electrolyte and the exposed end of the negative electrode tab 300 .

[0040] In an optional embodiment, the winding core assembly further includes a positive electrode tab 200, and one end of the positive electrode tab 200 is disposed on the winding core body 100;

[0041] The positive electrode tab 200 is bent and then bent in the reverse direction and connected to the cover plate assembly 500 .

[0042] In an optional embodiment, the cover plate assembly 500 includes a cover plate body 130 and a positive electrode column disposed on the cover plate body 130; and the positive electrode tab 200 is connected to the positive electrode column.

[0043] In an optional embodiment, the positive electrode post includes a post body 140 and a connecting plate 150, the post body 140 is inserted through the cover body 130, and the connecting plate 150 is arranged on the post body 140;

[0044] The heat insulation component 110 is in a ring shape, and an assembly hole 120 is provided in the middle of the heat insulation component 110 . The positive electrode tab 200 is connected to the connecting plate 150 through the assembly hole 120 .

[0045] In some embodiments, the winding core assembly also includes a positive electrode tab 200, which is bent and then bent in the opposite direction; the positive electrode tab 200 is also wrapped with insulating tape so that the positive electrode tab 200 has only one exposed end, which is connected to the positive electrode column on the cover plate assembly 500.

[0046] The connecting plate 150 of the positive electrode is welded to the electrode body 140. The outer diameter of the connecting plate is generally larger than the assembly hole 120 of the insulation component 110. The insulation component 110 maintains a fixed interval between the connecting plate and the core body 100 to ensure that the connecting plate will not contact the core body 100. The positive electrode tab 200 is welded to the connecting plate 150, so that the insulation component 110 will not affect the connection between the positive electrode tab 200 and the cover plate assembly 500.

[0047] In an optional embodiment, the outer diameter of the thermal insulation component 110 is greater than the inner diameter by more than 1 mm.

[0048] In an optional embodiment, the thickness of the thermal insulation assembly 110 is less than or equal to 0.2 mm.

[0049] In an optional embodiment, a mounting hole is provided on the cover plate body 130 , a sealing ring is sleeved on the pole body 140 , and the sealing ring is disposed in the mounting hole.

[0050] In an optional embodiment, the thermal insulation component 110 is made of one of insulating plastic, insulating ceramic and insulating glass.

[0051] The thermal insulation component 110 is in the shape of a ring, wherein the outer diameter of the thermal insulation component 110 is generally 1 mm larger than the inner diameter, and the thickness of the thermal insulation component 110 is generally not greater than 0.2 mm; and the thermal insulation component 110 is made of insulating material, such as insulating plastic, insulating ceramic or insulating glass.

[0052] The cover plate body 130 has a mounting hole, which is generally arranged concentrically with the assembly hole 120 of the thermal insulation assembly 110 ; the positive electrode tab 200 is ultrasonically welded to the positive electrode column through the assembly hole 120 .

[0053] The cover body 130 has a mounting hole, the pole body 140 is assembled in the mounting hole, and the sealing ring is sleeved on the pole body 140. The sealing ring keeps the pole body 140 and the cover body 130 spaced apart to avoid short circuit.

[0054] The utility model provides a heat insulation component 110 on the core assembly of the lithium-ion battery, and the heat insulation component 110 is arranged on the side of the core assembly facing the cover assembly 500. When the cover assembly 500 and the shell 600 are laser welded, the heat insulation component 110 effectively avoids the problem of diaphragm burns caused by the heat generated when the laser beam irradiates the surface of the material and absorbs energy and the temperature rises rapidly to the melting point during the welding process, thereby preventing the core assembly structure from being destroyed and causing a short circuit, which is beneficial to ensuring the safety performance of the lithium-ion battery.

[0055] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A lithium ion battery, characterized in that: It comprises a cover plate assembly (500), a winding core assembly and a shell (600); the shell (600) is provided with an upper opening (700), and the winding core assembly is arranged in the shell (600); The cover plate assembly (500) is arranged at the upper opening (700) and welded to the shell (600); and a heat insulation assembly (110) is arranged on a side of the winding core assembly facing the cover plate assembly (500).

2. The lithium-ion battery according to claim 1, characterized in that The winding core assembly comprises a winding core body (100) and a negative electrode tab (300) arranged on the winding core body (100), wherein the negative electrode tab (300) is connected to the bottom of the shell (600) after being bent; An insulating base pad (800) is provided between the negative electrode tab (300) and the winding core body (100).

3. The lithium-ion battery according to claim 2, characterized in that: The insulating base pad (800) is provided with a through hole (900), and the through hole (900) is arranged concentrically with the winding core hole of the winding core body (100).

4. The lithium-ion battery according to claim 2, characterized in that: The winding core assembly further comprises a positive electrode tab (200), one end of the positive electrode tab (200) being arranged on the winding core body (100); The positive electrode tab (200) is bent and then bent in the reverse direction and connected to the cover plate assembly (500).

5. The lithium-ion battery according to claim 4, characterized in that: The cover plate assembly (500) comprises a cover plate body (130) and a positive electrode column arranged on the cover plate body (130); the positive electrode tab (200) is connected to the positive electrode column.

6. The lithium-ion battery according to claim 5, characterized in that: The positive pole comprises a pole body (140) and a connecting plate (150); the pole body (140) is inserted into the cover body (130), and the connecting plate (150) is arranged on the pole body (140); The heat insulation component (110) is in the shape of a ring, an assembly hole (120) is provided in the middle of the heat insulation component (110), and the positive electrode tab (200) is connected to the connection plate (150) through the assembly hole (120).

7. The lithium-ion battery according to claim 6, characterized in that: The outer diameter of the thermal insulation component (110) is greater than the inner diameter by more than 1 mm.

8. The lithium-ion battery according to claim 6, characterized in that The thickness of the thermal insulation component (110) is less than or equal to 0.2 mm.

9. The lithium-ion battery according to claim 6, characterized in that: The cover plate body (130) is provided with a mounting hole, and the pole body (140) is sleeved with a sealing ring, which is arranged in the mounting hole.

10. The lithium ion battery according to claim 1, characterized in that: The material of the heat insulation component (110) is one of insulating plastic, insulating ceramic and insulating glass.

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