阅读说明：本技术 一种可充电锂电池 (Rechargeable lithium battery ) 是由 宋浩堂 李林森 黄明咏 文辰 于 2021-10-28 设计创作，主要内容包括：本发明涉及电池技术领域,尤其是指一种可充电锂电池,包括外壳、卷芯、正极端子、负极端子、密封件、保护板、绝缘件、钢帽、泄压阀和正极连接片,所述卷芯上端设有正极、负极,本发明将卷芯与保护板设置于同一腔体内部,密封件对保护板进行保护,防止卷芯内部的电解液腐蚀保护板,并且本发明在安装时,可直接将正极端子和负极端子焊接于保护板上,组装完成后,即可将电解液注入外壳内部,之后进行封装,然后将钢帽进行安装,封装工序密封、测试、贴标,可简化PACK焊接组装工序,降低生产成本。(The invention relates to the technical field of batteries, in particular to a rechargeable lithium battery which comprises a shell, a winding core, a positive terminal, a negative terminal, a sealing element, a protective plate, an insulating element, a steel cap, a pressure release valve and a positive connecting sheet, wherein the positive and negative electrodes are arranged at the upper end of the winding core.)

1. A rechargeable lithium battery, characterized in that: comprises a shell, a roll core, a positive terminal, a negative terminal, a sealing element, a protective plate, an insulating element, a steel cap, a pressure release valve and a positive connecting sheet, the winding core is arranged in the shell, the sealing element is arranged at the upper part of the winding core, the protective plate is arranged in the sealing element, the upper end of the winding core is provided with an anode and a cathode, the anode of the winding core is connected with the anode terminal, the negative pole of the winding core is connected with the negative pole terminal, the positive pole terminal and the negative pole terminal are both connected with the protection plate, the anode terminal is connected with the steel cap through the anode connecting piece, the insulating piece is arranged between the shell and the steel cap, the pressure release valve is installed at the lower end of the steel cap, a plurality of air release holes are formed in the steel cap, a negative end is arranged at the lower end of the winding core, and the negative end is connected with the shell.

2. A rechargeable lithium battery according to claim 1, wherein: the steel cap with be provided with the gasket between the relief valve, the gasket adopts the metal material to make, the gasket is the annular.

3. A rechargeable lithium battery according to claim 1, wherein: roll up core bottom with be provided with the insulating piece between the shell, the insulating piece adopts corrosion-resistant material to make.

4. A rechargeable lithium battery according to claim 1, wherein: the pressure release valve bottom is provided with the nickel piece, the lower extreme of nickel piece with positive pole connection piece is connected, the nickel piece middle part is provided with dodges the hole.

5. A rechargeable lithium battery according to claim 1, wherein: the outer surface of the protection plate is injected with a sealing protection layer, and the sealing protection layer is made of corrosion-resistant materials.

6. A rechargeable lithium battery according to claim 1, wherein: the sealing element is made of resin.

7. A rechargeable lithium battery according to claim 1, wherein: the shell upper end is provided with the annular and lets the position portion, the annular lets the position portion cross section be semi-circular.

8. A rechargeable lithium battery according to claim 2, wherein: the upper part of the insulating part is provided with a mounting cavity, and the steel cap, the gasket and the pressure release valve are sequentially mounted inside the mounting cavity from top to bottom.

9. A method of making a rechargeable lithium battery, comprising the steps of: fully coating the protection plate and the components by adopting a low-pressure injection molding process; placing the coated protective plate and the roll core in the same cavity formed in the shell; and welding the positive terminal and the negative terminal on the protection plate, injecting electrolyte into the shell after the assembly is finished, packaging, and installing the steel cap.

10. The method for preparing a rechargeable lithium battery as claimed in claim 9, wherein the step of fully coating the protection plate and the components by using a low pressure injection molding process comprises: firstly, placing a protective plate provided with components in a low-pressure injection mold; the polypropylene resin is heated to a melting point to become a liquid form, and the melted polypropylene resin is injected into a low-pressure injection mold by a low-pressure injection molding process, and then cooled and solidified into a desired shape.

Technical Field

The invention relates to the technical field of batteries, in particular to a rechargeable lithium battery.

Background

Batteries can be classified into various types according to their sizes. The types commonly used are AAA, AA, C and D, which correspond to the types 7, 5, 2 and 1 batteries commonly called, wherein the types 1 and 5 batteries are most widely used. The No. 1 battery is widely applied to civil, military and special DC power supplies, and the No. 5 battery is more widely applied in daily life, such as digital cameras, electric toys and the like.

However, the current battery cell is assembled with PACK, and the battery cell and PACK need to be assembled twice and tested respectively, so that the existing battery is complex to process and high in production cost.

Disclosure of Invention

The present invention provides a rechargeable lithium battery that addresses the problems of the prior art.

In order to solve the technical problems, the invention adopts the following technical scheme:

the invention provides a rechargeable lithium battery, which comprises a shell, a winding core, a positive terminal, a negative terminal, a sealing element, a protective plate, an insulating part, a steel cap, a pressure release valve and a positive connecting sheet, wherein the winding core is arranged in the shell, the sealing element is arranged at the upper part of the winding core, the protective plate is arranged in the sealing element, the upper end of the winding core is provided with a positive electrode and a negative electrode, the positive electrode of the winding core is connected with the positive terminal, the negative electrode of the winding core is connected with the negative terminal, the positive terminal and the negative terminal are both connected with the protective plate, the positive terminal is connected with the steel cap through the positive connecting sheet, the insulating part is arranged between the shell and the steel cap, the pressure release valve is arranged at the lower end of the steel cap, and the steel cap is provided with a plurality of air release holes, the lower end of the winding core is provided with a negative end, and the negative end is connected with the shell.

Preferably, a gasket is arranged between the steel cap and the pressure release valve, the gasket is made of metal materials, and the gasket is annular.

Preferably, the bottom of the winding core and the shell are provided with insulating sheets, and the insulating sheets are made of corrosion-resistant materials.

Preferably, the bottom of the pressure release valve is provided with a nickel sheet, the lower end of the nickel sheet is connected with the positive connecting sheet, and the middle part of the nickel sheet is provided with an avoiding hole.

Preferably, the outer surface of the protection plate is injected with a sealing protection layer, and the sealing protection layer is made of corrosion-resistant materials.

Preferably, the sealing member is made of a resin material.

Preferably, the upper end of the shell is provided with an annular yielding part, and the cross section of the annular yielding part is semicircular.

Preferably, the upper part of the insulating part is provided with a mounting cavity, and the steel cap, the gasket and the pressure release valve are sequentially mounted in the mounting cavity from top to bottom.

The invention also provides a preparation method of the rechargeable lithium battery, which comprises the following steps: fully coating the protection plate and the components by adopting a low-pressure injection molding process; placing the coated protective plate and the roll core in the same cavity formed in the shell; and welding the positive terminal and the negative terminal on the protection plate, injecting electrolyte into the shell after the assembly is finished, packaging, and installing the steel cap.

Preferably, the method for fully coating the protection plate and the component by using the low-pressure injection molding process specifically comprises the following steps: firstly, placing a protective plate provided with components in a low-pressure injection mold; the polypropylene resin is heated to a melting point to become a liquid form, and the melted polypropylene resin is injected into a low-pressure injection mold by a low-pressure injection molding process, and then cooled and solidified into a desired shape.

The invention has the beneficial effects that:

the invention provides a rechargeable lithium battery, which comprises a shell, a winding core, a positive terminal, a negative terminal, a sealing element, a protective plate, an insulating part, a steel cap, a pressure release valve and a positive connecting sheet, wherein the winding core is arranged in the shell, the sealing element is arranged at the upper part of the winding core, the protective plate is arranged in the sealing element, the upper end of the winding core is provided with a positive electrode and a negative electrode, the positive electrode of the winding core is connected with the positive terminal, the negative electrode of the winding core is connected with the negative terminal, the positive terminal and the negative terminal are both connected with the protective plate, the positive terminal is connected with the steel cap through the positive connecting sheet, the insulating part is arranged between the shell and the steel cap, the pressure release valve is arranged at the lower end of the steel cap, and the steel cap is provided with a plurality of air release holes, the invention is characterized in that the lower end of the winding core is provided with a negative end, the negative end is connected with the shell, the winding core and the protection plate are arranged in the same cavity, the protection plate is protected by the sealing element, and the protection plate is prevented from being corroded by electrolyte in the winding core.

Drawings

FIG. 1 is a schematic structural diagram of the present invention.

Fig. 2 is an exploded view of the present invention.

Fig. 3 is a cross-sectional view of the present invention.

Fig. 4 is an enlarged view of a portion a in fig. 3.

Fig. 5 is an enlarged view of a portion B in fig. 3.

Fig. 6 is a top view of the present invention.

The reference numerals are respectively:

the structure comprises a shell (1), a winding core (2), a positive terminal (3), a negative terminal (4), a sealing element (5), a protective plate (6), an insulating element (7), a steel cap (8), a pressure release valve (9), a positive connecting sheet (10), a positive electrode (11), a negative electrode (12), a gasket (13), an insulating sheet (14), a nickel sheet (15), an avoiding hole (16), an avoiding part (17), a mounting cavity (18), an air leakage hole (19) and a negative electrode end (20).

Detailed Description

In order to facilitate understanding of those skilled in the art, the present invention will be further described with reference to the following examples and drawings, which are not intended to limit the present invention. The present invention is described in detail below with reference to the attached drawings.

The lithium ion battery is provided with the protection circuit, even if short circuit occurs outside, the protection circuit can be used as a switch, the battery can be effectively protected, and the probability of safety accidents is reduced. Because of the risk that the electrolyte leaks in the existing battery core, the electrolyte leakage may cause chemical corrosion of the protection plate and the protection circuit thereof, and therefore the protection plate in the prior art is generally placed outside the battery core cavity. However, the protection plate is placed outside the cavity of the battery core, the area of the top of the battery core is limited, negative welding is a technical difficulty, and insufficient welding easily causes high internal resistance and increased self heat loss in the welding process, so that the capacity and the battery performance of the lithium ion battery are affected.

In the application, the protection board and the component are fully coated by an LPM (Low pressure injection molding) process, where LPM is Low pressure injection molding. Specifically, a protection plate provided with components is placed in a low-pressure injection mold; and heating the polypropylene resin to a melting point by adopting injection molding equipment to change the polypropylene resin into a liquid form, injecting the melted polypropylene resin into a low-pressure injection mold by adopting a low-pressure injection molding technology, and then cooling and solidifying the polypropylene resin into a required shape. The low-pressure injection molding technology is used for injection molding under the conditions of low pressure and low temperature, the packaging process can be carried out under the condition of not damaging a precise electronic component to be protected, and the environment protection is provided for the fragile electronic component so as to achieve the effects of insulation, temperature resistance, shock absorption, moisture protection, water prevention, dust prevention, chemical corrosion resistance and the like. Carry out the total coverage with protection shield and components and parts, then solved the chemical corrosion problem that electrolyte was revealed and is caused, consequently can place the protection shield inside the cavity of electric core, increased negative pole welding area to can effectively avoid potential problems such as rosin joint of PACK process.

As shown in fig. 1-6, the rechargeable lithium battery provided by the present invention includes a case 1, a winding core 2, a positive terminal 3, a negative terminal 4, a sealing member 5, a protective plate 6, an insulating member 7, a steel cap 8, a pressure relief valve 9, and a positive connecting piece 10, wherein the winding core 2 is installed inside the case 1, the sealing member 5 is installed on the upper portion of the winding core 2, the protective plate 6 is installed inside the sealing member 5, the upper end of the winding core 2 is provided with a positive electrode 11 and a negative electrode 12, the positive electrode 11 of the winding core 2 is connected to the positive terminal 3, the negative electrode 12 of the winding core 2 is connected to the negative terminal 4, both the positive terminal 3 and the negative terminal 4 are connected to the protective plate 6, the positive terminal 3 is connected to the steel cap 8 through the positive connecting piece 10, the insulating member 7 is installed between the case 1 and the steel cap 8, the pressure release valve 9 is arranged at the lower end of the steel cap 8, the steel cap 8 is provided with a plurality of air release holes 19, the lower end of the winding core 2 is provided with a negative end 20, the negative end 20 is connected with the shell 1, the winding core 2 and the protection plate 6 are arranged in the same cavity, the protection plate 6 is protected by the sealing element 5, and the protection plate 6 is prevented from being corroded by electrolyte in the winding core 2.

In this embodiment, steel cap 8 with be provided with gasket 13 between the relief valve 9, gasket 13 adopts the metal material to make, gasket 13 is the annular, and relief valve 9 can be with the inside gas outgoing of battery when the battery expands gas, and gasket 13 is used for consolidating the relief valve all around, prevents that gas from spilling over from relief valve 9 lateral part. The pressure relief valve has the function of a circuit breaker, when the internal pressure of the battery rises to a certain degree, the pressure relief valve acts to cut off a current loop, and when the internal pressure of the battery further rises, the structure of the pressure relief valve is damaged, the internal pressure of the battery is released, and the battery is prevented from exploding.

In this embodiment, roll up core 2 bottom with be provided with insulating piece 14 between the shell 1, insulating piece 14 adopts corrosion-resistant material to make, and insulating piece 14 prevents to roll up core 2 bottom and shell 1 and is connected.

In this embodiment, the bottom of the pressure release valve 9 is provided with a nickel sheet 15, the lower end of the nickel sheet 15 is connected with the positive connecting sheet 10, the middle of the nickel sheet 15 is provided with a avoiding hole 16, the pressure release valve 9 is made of a metal sheet, the upper part of the insulating part 7 is provided with an installation cavity 18, the steel cap 8, the gasket 13, the pressure release valve 9 is sequentially installed inside the installation cavity 18 from top to bottom.

In this embodiment, the outer surface of the protection plate 6 is injection-molded with a sealing protection layer, the sealing protection layer is made of corrosion-resistant material, and the sealing protection layer can further prevent the electrolyte inside the housing 1 from corroding the electronic components inside the protection plate 6.

In this embodiment, the sealing member 5 is made of a resin material.

In this embodiment, the upper end of the housing 1 is provided with an annular relief portion 17, and the cross section of the annular relief portion 17 is semicircular.

Although the present invention has been described with reference to the above preferred embodiments, it should be understood that various changes, substitutions and alterations can be made herein without departing from the spirit and scope of the invention as defined by the appended claims.