CN201717321U

CN201717321U - High-capacity button lithium battery

Info

Publication number: CN201717321U
Application number: CN200920289265.2U
Authority: CN
Inventors: 陈爱国; 吴刚; 王志刚
Original assignee: LIXING (HUOJU) POWER CO Ltd WUHAN
Current assignee: LIXING (HUOJU) POWER CO Ltd WUHAN
Priority date: 2009-12-15
Filing date: 2009-12-15
Publication date: 2011-01-19
Anticipated expiration: 2019-12-15

Abstract

The utility model discloses a high-capacity button-type lithium battery, which comprises a positive electrode case, a negative electrode cover connected and sealed with the positive electrode case, and a positive electrode material, a negative electrode material and an electrolyte are arranged in a cavity between the positive electrode case and the negative electrode cover. A collector ring is provided between the positive electrode casing and the positive electrode material, and there is a gap between the collector ring and the side wall of the positive electrode casing. The utility model reduces the contact resistance between the positive electrode material and the positive electrode casing by superimposing the current collecting ring between the positive electrode shell and the positive electrode material, and at the same time, the gap formed by the current collecting ring and the inner wall of the battery shell can store a sufficient amount of electrolyte; thus Improve battery discharge capacity and prolong battery life.

Description

High capacity button lithium battery

技术领域technical field

本实用新型属于高容量锂电池，具体涉及一种高容量扣式锂电池。The utility model belongs to a high-capacity lithium battery, in particular to a high-capacity button lithium battery.

背景技术Background technique

锂锰扣式电池具有体积小，电池电压高，且放电电压平稳，工作温度范围广(-20℃～60℃)，储存寿命长等特点，广泛用于电脑主板、计算器、电子表、遥控器、电子玩具及饰品等。目前外型尺寸较大的锂锰扣式电池(如CR2450、CR2477等)，其结构如图1所示，包括正极壳1、与正极壳连接密封的负极盖2，正极壳和负极盖之间的腔体内设有正极材料3、负极材料4及电解液，由于正极材料吸收电解液能力不足、而常规结构电池封口后游离电解液量较少，使得电池放电或使用时尤其是中后期电池成流反应所需电解液供应不上、电池极化增大；另外由于负极逐渐消耗、厚度变薄，而正极横向膨胀，使正极与电池外壳的接触电阻增大，最终导致电池负载性能迅速下降、容量偏低、使用寿命减短。Lithium-manganese button batteries have the characteristics of small size, high battery voltage, stable discharge voltage, wide operating temperature range (-20℃～60℃), long storage life, etc., and are widely used in computer motherboards, calculators, electronic watches, remote controls Devices, electronic toys and accessories, etc. At present, lithium-manganese button batteries with large external dimensions (such as CR2450, CR2477, etc.) have a structure as shown in Figure 1, including a positive electrode case 1, a negative electrode cover 2 connected and sealed with the positive electrode case, and a gap between the positive electrode case and the negative electrode cover. There are positive electrode material 3, negative electrode material 4 and electrolyte in the cavity. Due to the insufficient ability of the positive electrode material to absorb the electrolyte, and the amount of free electrolyte after the conventional structure battery is sealed, the battery is discharged or used, especially in the middle and late stages. The electrolyte required for the flow reaction cannot be supplied, and the polarization of the battery increases; in addition, due to the gradual consumption of the negative electrode, the thickness becomes thinner, and the lateral expansion of the positive electrode increases the contact resistance between the positive electrode and the battery case, which eventually leads to a rapid decline in battery load performance. The capacity is low and the service life is shortened.

发明内容Contents of the invention

本实用新型的目的在于提供一种新结构的高容量扣式锂电池，以提高电池放电能力，从而解决上述问题。The purpose of this utility model is to provide a new structure of high-capacity button-type lithium battery to improve the discharge capacity of the battery, thereby solving the above-mentioned problems.

本实用新型的技术方案为：高容量扣式锂电池，它包括正极壳、与正极壳连接密封的负极盖，正极壳和负极盖之间的腔体内设有正极材料、负极材料及电解液，所述正极壳和正极材料之间设有集流环，集流环与正极壳侧壁之间有间隙。The technical scheme of the utility model is: a high-capacity button-type lithium battery, which includes a positive electrode case, a negative electrode cover connected and sealed with the positive electrode case, and a positive electrode material, a negative electrode material and an electrolyte are arranged in the cavity between the positive electrode case and the negative electrode cover, A collector ring is provided between the positive electrode case and the positive electrode material, and there is a gap between the collector ring and the side wall of the positive electrode case.

所述集流环包括底面板，底面板上设有侧壁环。The collector ring includes a bottom panel on which a side wall ring is arranged.

所述侧壁环上部设有外槽环壁，侧壁环与外槽环壁之间构成电解液槽。The upper part of the side wall ring is provided with an outer tank ring wall, and an electrolyte tank is formed between the side wall ring and the outer tank ring wall.

所述集流环的侧壁环上或侧壁环底部设有电解液道流孔。The side wall ring or the bottom of the side wall ring of the collector ring is provided with electrolyte channel flow holes.

所述正极材料是柱型或锥台型。The positive electrode material is cylindrical or truncated.

本实用新型在正极壳与正极材料之间叠加集流环后，减小了正极材料与正极壳的接触电阻，同时集流环与电池外壳内壁围成的间隙可储存足量的电解液；从而提高电池放电容量、延长电池使用寿命。The utility model reduces the contact resistance between the positive electrode material and the positive electrode case by superimposing the current collector ring between the positive electrode case and the positive electrode material, and at the same time, the gap formed by the current collector ring and the inner wall of the battery casing can store a sufficient amount of electrolyte; thus Improve battery discharge capacity and prolong battery life.

附图说明Description of drawings

图1现有高容量扣式锂电池的结构示意图。Fig. 1 is a schematic structural diagram of an existing high-capacity button lithium battery.

图2本实用新型高容量扣式锂电池的结构示意图。Fig. 2 is a schematic structural diagram of a high-capacity button lithium battery of the present invention.

图3本实用新型高容量扣式锂电池集流环示意图。Fig. 3 is a schematic diagram of the collector ring of the high-capacity button-type lithium battery of the utility model.

具体实施方式Detailed ways

如图2所示，高容量电池结构中，包括含有绝缘密封圈的负极盖5与正极壳6连接密封；负极盖5与正极壳6之间的空腔内设置正极材料7、负极材料8，正极材料7与负极材料8之间有隔膜。在正极壳6与正极材料7之间设有集流环9，集流环9使用不锈钢或不锈铁材料制成。集流环9包括底面板9.1，底面板9.1上设有侧壁环9.2，侧壁环9.2上部设有外槽环壁9.3，侧壁环9.2与外槽环壁9.3之间构成电解液槽9.4。集流环的侧壁环底部设有电解液道流孔9.5。电解液道流孔9.5设置为多个，本实施例中电解液道流孔9.5设在集流环9底部圆弧，电解液道流孔对称设置为2-8个(如图3所示)。本实施例中正极材料7为锥台型。集流环9为碗状。As shown in Figure 2, in the high-capacity battery structure, the negative electrode cover 5 including the insulating sealing ring is connected and sealed with the positive electrode case 6; the positive electrode material 7 and the negative electrode material 8 are arranged in the cavity between the negative electrode cover 5 and the positive electrode case 6, There is a separator between the positive electrode material 7 and the negative electrode material 8 . A collector ring 9 is provided between the positive electrode case 6 and the positive electrode material 7, and the collector ring 9 is made of stainless steel or stainless iron. The collector ring 9 includes a bottom panel 9.1, the bottom panel 9.1 is provided with a side wall ring 9.2, the upper part of the side wall ring 9.2 is provided with an outer groove ring wall 9.3, and an electrolyte tank 9.4 is formed between the side wall ring 9.2 and the outer groove ring wall 9.3 . The bottom of the side wall ring of the collector ring is provided with an electrolyte channel flow hole 9.5. Electrolyte channel orifice 9.5 is set to a plurality of, and in the present embodiment, electrolytic liquid channel orifice 9.5 is arranged on the circular arc at the bottom of collector ring 9, and electrolytic liquid channel orifice is symmetrically set to 2-8 (as shown in Figure 3) . In this embodiment, the positive electrode material 7 is a truncated cone. The collector ring 9 is bowl-shaped.

由于增加集流环9，使得设计时正极材料厚度必须减小，为了保持正极材料重量并配合负极盖、集流环尺寸，将正极材料外型改变为锥台形，使正极材料与集流环9、负极盖5的装配横向间隙缩小，限制了电池放电过程中正极材料的横向膨胀；正极壳6叠加集流环9后，减小了正极壳与正极材料的接触电阻，而集流环9与正极壳内壁围成的间隙可储存足量的游离电解液，弥补了常规结构电池游离电解液不足的缺陷；因此显著改善了电池的负载性能、有效提高了电池放电容量。Due to the addition of the collector ring 9, the thickness of the positive electrode material must be reduced during design. In order to maintain the weight of the positive electrode material and match the size of the negative electrode cover and collector ring, the shape of the positive electrode material is changed to a truncated cone shape, so that the positive electrode material and the collector ring 9 1. The assembly lateral gap of the negative electrode cover 5 is reduced, which limits the lateral expansion of the positive electrode material during battery discharge; after the positive electrode shell 6 is superimposed on the current collecting ring 9, the contact resistance between the positive electrode shell and the positive electrode material is reduced, and the current collecting ring 9 and the positive electrode material are reduced. The gap surrounded by the inner wall of the positive electrode shell can store a sufficient amount of free electrolyte, which makes up for the defect of insufficient free electrolyte in batteries with conventional structures; therefore, the load performance of the battery is significantly improved, and the discharge capacity of the battery is effectively increased.

Claims

1. high power capacity button lithium battery, it comprises anode cover, is connected the negative cover of sealing with anode cover, be provided with positive electrode, negative material and electrolyte in the cavity between anode cover and the negative cover, it is characterized in that being provided with collecting ring between described anode cover and the positive electrode, gapped between collecting ring and the anode cover sidewall; Described collecting ring comprises bottom panel, and bottom panel is provided with side wall ring.

2. high power capacity button lithium battery according to claim 1 is characterized in that described side wall ring top is provided with the water jacket ring wall, constitutes electrolytic bath between side wall ring and the water jacket ring wall.

3. high power capacity button lithium battery as claimed in claim 1 or 2 is characterized in that on the side wall ring of collecting ring or the side wall ring bottom is provided with electrolysis fluid passage discharge orifice.

4. high power capacity button lithium battery according to claim 1 is characterized in that positive electrode is column type or frustum type.