阅读说明：本技术 一种方形锂电池 (Square lithium battery ) 是由 陈利权 孙志强 李倩伟 刘金成 于 2021-05-14 设计创作，主要内容包括：本发明涉及锂电池技术领域,具体地说,涉及一种方形锂电池,包括电池本体和保护体,其特征在于,所述保护体设置在所述电池本体底部,其中：所述电池本体底部为弧形,所述保护体设置有与所述电池本体弧形弧度一致的凹槽。本发明提供的一种方形锂电池,通过在电池底部设置保护体,保护体设置有与所述电池弧形弧度一致的凹槽,所述保护体沿电池底部弧形部分设置,可以防止电解液滞留在电池底部,同时因为有保护体的依托,所述电池在充电过程中,也可以防止电池结构变形。(The invention relates to the technical field of lithium batteries, in particular to a square lithium battery, which comprises a battery body and a protective body, and is characterized in that the protective body is arranged at the bottom of the battery body, wherein: the bottom of the battery body is arc-shaped, and the protective body is provided with a groove which is consistent with the arc radian of the battery body. According to the square lithium battery provided by the invention, the protective body is arranged at the bottom of the battery, the protective body is provided with the groove consistent with the arc radian of the battery, the protective body is arranged along the arc part at the bottom of the battery, so that electrolyte can be prevented from being retained at the bottom of the battery, and meanwhile, the battery can be prevented from deforming in the charging process due to the support of the protective body.)

1. The utility model provides a square lithium cell, includes battery body and protective body, its characterized in that, the protective body sets up battery body bottom, wherein:

the bottom of the battery body is arc-shaped, and the protective body is provided with a groove which is consistent with the arc radian of the battery body.

2. The lithium prismatic battery according to claim 1, wherein the battery body is a battery with a winding structure, and comprises a diaphragm, a positive tab and a negative tab, wherein the central part of the diaphragm is wound in a spiral shape, the positive tab and the negative tab are respectively arranged at two ends of the battery body, the positive tab is welded at one end of the positive plate, and the negative tab is welded at one end of the negative plate.

3. A lithium prismatic battery according to claim 2, wherein the other end of said positive electrode sheet and the other end of said negative electrode sheet are each wound around a spiral portion of said separator.

4. A lithium prismatic battery according to claim 1, wherein said battery body outer layer is provided with a battery case, said battery case surrounds said battery body.

5. The square lithium battery as claimed in claim 1, wherein the top of the battery body is provided with a terminal post terminal.

6. A lithium prismatic battery according to claim 4, wherein said battery case is a prismatic receiving cavity.

7. A lithium prismatic battery according to claim 4, wherein said battery case contains an electrolyte.

8. The lithium prismatic battery as claimed in claim 4, wherein said protective body is disposed at the junction of said battery body bottom and said battery case.

9. The lithium square battery of claim 1, wherein the protective body further comprises a support portion, the groove and the support portion are of an integral structure, and the support portion is connected with the bottom of the battery case.

10. A lithium prismatic battery according to claim 1, wherein said protective body is a plastic body.

Technical Field

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

Background

The lithium ion battery has the advantages of high voltage, high specific energy, more recyclable times, long storage time and the like, and is widely applied to portable electronic equipment and large and medium-sized electric equipment such as electric automobiles, electric bicycles and the like, so that the requirement on the performance of the lithium ion battery is higher and higher.

Present coiling structure lithium cell bottom is the fillet, there is great circular arc space battery both sides, can be detained electrolyte, cause the waste, electrolyte is the combustible substance in the lithium cell simultaneously, the electrolyte of detaining can increase the risk that electric core was fired, and the insulating pad of present lithium cell core package circular arc and bottom is the contact relation of line and face, this contact that has just led to lithium cell core package and bottom insulating pad is little, the lithium cell is in charging process, the core package inflation leads to lithium cell core package and bottom insulating pad's contact pressure increase easily, cause the core package structural deformation easily.

Disclosure of Invention

Because current coiling structure battery bottom is the arc, has the problem of detaining electrolyte, causes electrolyte extravagant easily, because electrolyte is the inflammable substance in the lithium cell, detains the risk that there is the battery to catch fire in the electrolyte in the battery simultaneously, provides a square lithium cell and solves above-mentioned technical problem.

The utility model provides a square lithium cell, includes battery body and protective body, the protective body sets up battery body bottom, wherein: the bottom of the battery body is arc-shaped, and the protective body is provided with a groove which is consistent with the arc radian of the battery body.

Further, the battery body is a winding structure battery and comprises a diaphragm, a positive tab and a negative tab, the central part of the diaphragm is wound in a spiral shape, the positive tab and the negative tab are respectively arranged at two ends of the battery body, the positive tab is welded at one end of the positive plate, and the negative tab is welded at one end of the negative plate.

Further, the other end of the positive electrode sheet and the other end of the negative electrode sheet are respectively wound around the spiral position of the diaphragm.

Further, a battery shell is arranged on the outer layer of the battery body and wraps the battery body.

Further, the top of the battery body is provided with a pole terminal.

Furthermore, the battery shell is a square accommodating cavity.

Further, the battery case contains an electrolyte.

Further, the protection body is arranged at the joint of the bottom of the battery body and the battery shell.

Further, the protection body further comprises a supporting part, the groove and the supporting part are of an integrated structure, and the supporting part is connected with the bottom of the battery shell.

Further, the protective body is a plastic body.

According to the square lithium battery provided by the invention, the protective body is arranged at the bottom of the battery, the protective body is provided with the groove consistent with the arc radian of the battery, the protective body is arranged along the arc part at the bottom of the battery, so that electrolyte can be prevented from being retained at the bottom of the battery, and meanwhile, the battery can be prevented from deforming in the charging process due to the support of the protective body.

Drawings

FIG. 1 is a schematic diagram of a lithium square battery according to the present invention;

fig. 2 is a diagram of a gasket according to the present invention.

The reference numerals are explained below:

1: a battery post terminal; 2: a battery body; 3: a battery case; 4: a protective body; 41: a groove; 42: a support portion.

Detailed Description

The embodiments of the present disclosure are described in detail below with reference to the accompanying drawings.

The embodiments of the present disclosure are described below with specific examples, and other advantages and effects of the present disclosure will be readily apparent to those skilled in the art from the disclosure in the specification. It is to be understood that the described embodiments are merely illustrative of some, and not restrictive, of the embodiments of the disclosure. The disclosure may be embodied or carried out in various other specific embodiments, and various modifications and changes may be made in the details within the description without departing from the spirit of the disclosure. It is to be noted that the features in the following embodiments and examples may be combined with each other without conflict. All other embodiments, which can be derived by a person skilled in the art from the embodiments disclosed herein without making any creative effort, shall fall within the protection scope of the present disclosure.

Example one

A square lithium battery, as shown in fig. 1, comprising a battery body 2 and a protective body 4, wherein the protective body 4 is arranged at the bottom of the battery body 2, wherein: the bottom of the battery body 2 is arc-shaped, and the protective body 4 is provided with a groove 41 consistent with the arc radian of the battery body 2.

The arc space between the bottom of the battery body 2 and the battery shell 3 is eliminated by the shape design of the contact position between the protective body 4 and the bottom of the battery body 2, and the electrolyte retention in the space is eliminated; through the design of laminating of battery body 2 bottom protective body 4 and battery body 2, improved the support of protective body 4 to battery body 2 and relied on the ability, improved the integrity of lithium cell inner structure.

Considering the safety characteristic of lithium cell, need carry out insulation protection with battery and outside casing, adopt in this application to add the insulation protection body in 2 bottoms of battery body, separate battery body and battery case and realize.

Further, in a preferred embodiment of the present application, as shown in fig. 1, the battery body 2 is a winding structure battery, and includes a diaphragm, a positive tab and a negative tab, the central portion of the diaphragm is wound to form a spiral shape, the positive tab and the negative tab are respectively disposed at two ends of the battery body, the positive tab is welded at one end of the positive tab, and the negative tab is welded at the beginning of the negative tab.

The diaphragm is used for separating the positive tab and the negative tab, so that the direct contact between the positive tab and the negative tab is avoided, the positive tab is welded with the initial end of the positive plate, the negative tab is welded with the initial end of the negative plate, the positive plate and the negative plate react with electrolyte injected into the battery to generate electric energy, and the two ends of the diaphragm are wound respectively by taking the spiral part of the diaphragm as the center.

The positive plate is made of lithium cobaltate, lithium manganate, a ternary material and a lithium iron phosphate material, and the negative plate is made of a graphite material, so that the cost is low, and the conductive effect is good.

In a preferred embodiment of the present invention, the other end of the positive electrode sheet and the other end of the negative electrode sheet are wound around a spiral portion of the separator.

Further, in a preferred embodiment of the present application, as shown in fig. 1, a battery case 3 is disposed outside the battery body 2, and the battery case 3 surrounds the battery body 2. The battery case is an external structural component of the lithium battery, and serves to receive the lithium battery and the electrolyte and to secure the structural strength thereof.

Further, in a preferred embodiment of the present application, as shown in fig. 1, the battery body 2 is provided with a terminal post 1 on the top. The terminal 1 one end of utmost point post with this body coupling of battery, the other end is connected with the external conductor, mainly plays the electrically conductive effect.

Further, in a preferred embodiment of the present application, the battery case 3 is a square body accommodating cavity. With battery case 3 design for the square body holds the chamber, can effectively hold battery and electrolyte, makes electrolyte fully react with the battery, improves the generating efficiency.

Further, in a preferred embodiment of the present application, the battery case 3 contains an electrolyte. Lithium battery electrolytes are carriers for ion transport in batteries. Generally consisting of a lithium salt and an organic solvent. The electrolyte plays a role in conducting ions between the positive electrode and the negative electrode of the lithium battery, and is a guarantee for the lithium battery to obtain the advantages of high voltage, high specific energy and the like.

Further, in a preferred embodiment of the present application, the protective body 4 is disposed at a junction of the bottom of the battery body and the battery case.

Further, in a preferred embodiment of the present application, as shown in fig. 2, the protection body 4 further includes a support portion 42, the groove 41 and the support portion are of an integral structure, the support portion 42 is connected to the bottom of the battery casing, and the support portion 42 supports the battery body 2. When the lithium battery is charged, the bottom protection body is attached to the battery body 2 in a supporting mode, and the potential structural deformation hazard caused by extrusion of a lithium battery core package is reduced.

Further, in a preferred embodiment of the present application, the protective body 4 is a plastic body. Specifically, the protective body is usually implemented by separating the core package and the battery case by using a plastic sheet made of PET or PP. Both PET and PC are polyester compounds, which are excellent in acid resistance, and lithium battery electrolytes generally use lithium tetrafluoroborate or hexafluorophosphate solutions, which do not decompose under alkaline conditions.

In the description of the present invention, it is to be understood that the terms "intermediate", "length", "upper", "lower", "front", "rear", "vertical", "horizontal", "inner", "outer", "radial", "circumferential", and the like, indicate orientations and positional relationships that are based on the orientations and positional relationships shown in the drawings, are used for convenience in describing the present invention and for simplicity in description, and do not indicate or imply that the referenced devices or elements must have a particular orientation, be constructed and operated in a particular orientation, and therefore, are not to be construed as limiting the present invention.

In the present invention, unless otherwise expressly stated or limited, the first feature may be "on" the second feature in direct contact with the second feature, or the first and second features may be in indirect contact via an intermediate. "plurality" means at least two, e.g., two, three, etc., unless specifically limited otherwise.

In the present invention, unless otherwise expressly stated or limited, the terms "mounted," "connected," "secured," and the like are to be construed broadly and can, for example, be fixedly connected, detachably connected, or integrally formed; may be mechanically coupled, may be electrically coupled or may be in communication with each other; they may be directly connected or indirectly connected through intervening media, or they may be connected internally or in any other suitable relationship, unless expressly stated otherwise. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

The above description is for the purpose of illustrating embodiments of the invention and is not intended to limit the invention, and it will be apparent to those skilled in the art that any modification, equivalent replacement, or improvement made without departing from the spirit and principle of the invention shall fall within the protection scope of the invention.